JP2019215110A - Muffler chamber design method and muffler chamber - Google Patents

Abstract

To provide a muffler chamber suitable for satisfying required muffling performance easily and reliably.SOLUTION: In a muffler chamber design method, an air inflow port 7 and an air outflow port 8 are formed on a chamber outer wall; a single or a plurality of partition walls 9 for muffling are installed in the inside of a chamber surrounded by the chamber outer wall; the inside of the chamber is partitioned into a plurality of regions Z1 and Z2 by the single or the plurality of partition walls 9; a communication port 10 that communicates the adjacent regions Z1 and Z2 with each other is formed on the partition walls 9; and the plurality of regions Z1 and Z2 are communicated with each other in series between the air inflow port 7 and the air outflow port 8 through the communication port 10 formed on the partition walls 9. When the position of the communication port 10 changes to a different position in a wall surface direction of the partition walls 9, respective muffling characteristics are analyzed; and on the basis of a result of the analysis, the position of the communication port 10 in the wall surface direction of the partition walls 9 is selected.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a noise reduction chamber design method and a noise reduction chamber, and more particularly, an air inlet and an air outlet are formed in an outer wall of a chamber, and one or more partition walls for noise reduction are provided inside the chamber surrounded by the outer wall of the chamber. Is installed, the inside of the chamber is divided into a plurality of regions by the one or more partition walls, the partition wall is formed with a communication port for communicating the adjacent regions, the plurality of regions, The present invention relates to a method for designing a sound deadening chamber that communicates in series between the air inlet and the air outlet through the communication hole formed in the partition wall, and a sound deadening chamber designed using the design method.

  In the sound deadening chamber design method described in Patent Document 1 below (FIG. 18), an air inlet 7 is formed on one chamber outer wall 6x of the sound deadening chamber 5, and an air outlet is provided on the other opposite chamber outer wall 6y. A virtual air path K that linearly connects the air inflow port 7 and the air outflow port 8 inside the chamber is assumed, and a noise reduction muffler that partially enters the virtual air path K is formed. The partition wall 9 is installed inside the chamber in a posture parallel to the opening surfaces of the air inlet 7 and the air outlet 8.

  Then, when the installation position of the partition wall 9 is moved in parallel to the air inlet 7 side or the outlet air 8 side, the change of the noise reduction characteristic and the amount of the partition wall 9 entering the virtual air path K change. The change of the noise reduction characteristic at this time is simulated, and the installation position of the partition wall 9 and the amount of the partition wall 9 entering the virtual air path K are selected based on the result of the simulation.

JP-A-2015-141297

  However, in the design method described in Patent Document 1, even if the installation position of the partition and the amount of entry of the partition into the virtual air path are selected based on the simulation result of the change in the noise reduction characteristics, the required noise reduction performance is required. It is difficult to reliably design a silencing chamber satisfying the above.

  In addition, the positions of the air inlet and the air outlet in the sound deadening chamber are restricted by the conditions of peripheral structures, peripheral devices, connection ducts, and the like at the installation location of the chamber. However, in the design method described in Patent Document 1, Is less responsive to constraints.

  In view of this situation, a main problem of the present invention is that the above problem is effectively solved by adopting a rational design method.

A first characteristic configuration of the present invention relates to a method for designing a sound deadening chamber.
An air inlet and an air outlet are formed in the outer wall of the chamber;
A single or plural partition walls for noise reduction are installed inside the chamber surrounded by the chamber outer wall, and the inside of the chamber is divided into a plurality of regions by the single or plural partition walls,
In the partition wall, a communication port for communicating the adjacent areas is formed,
The plurality of regions is a method for designing a sound deadening chamber that communicates in series between the air inlet and the air outlet through the communication port formed in the partition wall,
When the position of the communication port is changed to a different position in the wall direction of the partition wall, the respective silencing characteristics are analyzed,
The point is that the position of the communication port in the wall direction of the partition wall is selected based on the result of this analysis.

  According to the design method of the first characteristic configuration, the position of the communication port is changed to a different position in the wall direction of the partition wall in order to analyze the noise reduction characteristics of the noise reduction chamber to be designed. Compared to simply changing the installation position of the partition wall to the air inlet side or air outlet side as in the design method, or changing the amount of entry of the partition wall into the virtual air path, The interference state of the reflected sound inside can be changed more effectively, so that the sound deadening characteristics of the sound deadening chamber to be designed can be changed more variously.

  Therefore, according to the design method of the first characteristic configuration, since the noise reduction characteristics of the noise reduction chamber to be designed can be variously changed, the required noise reduction performance can be reduced as compared with the design method described in Patent Document 1. A silencing chamber with silencing characteristics suitable for satisfaction can be more reliably designed.

  Also, in the design method of the first characteristic configuration, there is no regulation that the partition wall is installed in a posture parallel to the opening surfaces of the air inlet and the air outlet as in the design method described in Patent Document 1. In addition, it is possible to flexibly cope with the fact that the positions of the air inlet and the air outlet are restricted by the condition of the installation location of the chamber. In this respect, the silencing chamber designing method is excellent in versatility.

The second characteristic configuration of the present invention specifies an embodiment suitable for implementing the first characteristic configuration.
For each case where the specification of the sound absorbing material attached to the inside of the chamber has changed to a different specification, the respective noise reduction characteristics are analyzed when the position of the communication port changes to a different position in the wall direction of the partition wall,
Based on the result of this analysis, the position of the communication port in the wall direction of the partition wall and the specification of the sound absorbing material are selected.

  According to the design method of the second characteristic configuration, the combination of the position of the communication port in the direction of the wall surface of the partition wall and the specification of the sound absorbing material attached to the inside of the chamber is suitable for satisfying the required noise reduction performance. Can be easily and accurately selected.

The third characteristic configuration of the present invention specifies an embodiment suitable for implementing the first or second characteristic configuration.
For each of the cases where the position of the air inlet or the air outlet on the outer wall of the chamber has changed to a different position, when the position of the communication port has changed to a different position in the wall direction of the partition wall, the respective noise reduction characteristics are different. Parsed,
Based on the result of this analysis, the position of the communication port in the wall direction of the partition wall and the position of the air inlet or the air outlet on the outer wall of the chamber are selected.

  According to the design method of the third characteristic configuration, the combination of the position of the communication port in the wall direction of the partition wall and the position of the air inlet or the air outlet on the outer wall of the chamber satisfies the required noise reduction performance. Suitable combinations can be easily and accurately selected.

The fourth characteristic configuration of the present invention specifies an embodiment suitable for implementing any one of the first to third characteristic configurations.
For each of the cases where the opening area of the communication port changes to a different opening area, the respective noise reduction characteristics are analyzed when the position of the communication port changes to a different position in the wall direction of the partition wall,
The position of the communication port in the wall direction of the partition wall and the opening area of the communication port are selected based on the result of this analysis.

  According to the design method of the third characteristic configuration, the combination of the position of the communication port in the direction of the wall surface of the partition wall and the opening area of the communication port can be easily and appropriately selected to satisfy the required noise reduction performance. It can be selected accurately.

The fifth characteristic configuration of the present invention specifies an embodiment suitable for implementing any of the first to fourth characteristic configurations.
For each of the cases where the number of the communication ports in the partition wall has changed to a different number of ports, the respective muffling characteristics are analyzed when the position of the communication port changes to a different position in the wall direction of the partition wall,
The point is that the position of the communication port in the wall direction of the partition wall and the number of the communication ports in the partition wall are selected based on the result of this analysis.

  According to the design method of the fifth characteristic configuration, for the combination of the position of the communication port in the direction of the wall surface of the partition wall and the number of communication ports in the partition wall, a combination suitable to satisfy the required noise reduction performance, Selection can be made easily and accurately.

The sixth characteristic configuration of the present invention specifies an embodiment suitable for implementing any of the first to fifth characteristic configurations.
For each of the cases where the position of the partition wall in the chamber has changed to a different position, the respective noise reduction characteristics are analyzed when the position of the communication port has changed to a different position in the wall direction of the partition wall,
The position of the communication port in the wall direction of the partition wall and the position of the partition wall inside the chamber are selected based on the result of this analysis.

  According to the design method of the sixth characteristic configuration, the combination of the position of the communication port in the direction of the wall surface of the partition wall and the position of the partition wall inside the chamber is a combination suitable for satisfying the required noise reduction performance. Selection can be made easily and accurately.

The seventh characteristic configuration of the present invention specifies an embodiment suitable for implementing the sixth characteristic configuration.
For each case where the number of regions of the plurality of regions has changed to a different number of regions, the respective silencing characteristics are analyzed when the position of the communication port changes to a different position in the wall direction of the partition wall,
The point is that the position of the communication port in the wall direction of the partition wall and the number of the plurality of regions are selected based on the result of the analysis.

  According to the design method of the seventh characteristic configuration, the combination of the position of the communication port in the direction of the wall surface of the partition wall and the number of the plurality of regions inside the chamber is a combination suitable for satisfying the required noise reduction performance. Can be easily and accurately selected.

The eighth characteristic configuration of the present invention specifies an embodiment suitable for implementing the sixth or seventh characteristic configuration.
For each of the cases where the position of the partition wall with respect to the opening surface of the air inlet and the air outlet respectively changes to a different position, when the position of the communication port changes to a different position in the wall direction of the partition wall, respectively. The silencing characteristics of the
Based on the result of this analysis, the position of the communication port in the wall direction of the partition wall and the attitude of the partition wall with respect to the respective opening surfaces of the air inlet and the air outlet are selected.

  According to the design method of the eighth characteristic configuration, the required noise reduction performance is obtained for a combination of the position of the communication port in the wall direction of the partition wall and the attitude of the partition wall with respect to the opening surfaces of the air inlet and the air outlet. A combination suitable for satisfying can be easily and accurately selected.

A ninth characteristic configuration of the present invention relates to a noise reduction chamber designed using the noise reduction chamber design method according to any one of the first to eighth characteristic configurations.
An opening area of the communication port is at least equal to an opening area of each of the air inlet and the air outlet.

  In the silencing chamber having the ninth characteristic configuration, since the opening area of the communication port is equal to or larger than the opening areas of the air inlet and the air outlet, the pressure loss of air in the process of passing through the inside of the chamber is effectively suppressed. Thus, power consumption of the blower fan can be reduced.

Front view showing an installation example of a muffling chamber Plan view showing an installation example of a sound deadening chamber Perspective view of the muffling chamber in the first embodiment FIG. 3 is a sectional view taken along line IV-IV in FIG. 3 showing a change in the position of the communication port. FIG. 3 is a sectional view taken along line IV-IV in FIG. 3 showing a change in the position of the communication port. FIG. 3 is a sectional view taken along line IV-IV in FIG. 3 showing a change in the position of the communication port. FIG. 3 is a sectional view taken along line IV-IV in FIG. 3 showing a change in the position of the communication port. FIG. 3 is a sectional view taken along line IV-IV in FIG. 3 showing a change in the position of the communication port. Graph showing noise reduction characteristics Graph showing noise reduction characteristics Graph showing noise reduction characteristics Graph showing noise reduction characteristics Graph showing noise reduction characteristics Perspective view of a muffling chamber according to a second embodiment. FIG. 6 is a cross-sectional view of the silencing chamber according to the second embodiment taken along line VIIa-VIIa in FIG. 6. FIG. 6 is a cross-sectional view of the sound deadening chamber according to the second embodiment taken along line VIIb-VIIb in FIG. 6. FIG. 7 is a cross-sectional view of the sound deadening chamber according to the second embodiment taken along line VIIc-VIIc in FIG. 7. Sectional view of the silencing chamber in the second embodiment taken along line VIId-VIId in FIG. 7. A perspective view showing the muffle chamber in an initial design stage. Graph showing noise reduction characteristics Front view showing an installation state of a muffling chamber in a third embodiment. The top view showing the installation state of the muffling chamber in a 3rd embodiment. XII-XII sectional view in FIG. 11 showing the installation form of the partition wall XII-XII sectional view in FIG. 11 showing the installation form of the partition wall XII-XII sectional view in FIG. 11 showing the installation form of the partition wall Plan view showing change in position of communication port Plan view showing change in position of communication port Plan view showing change in position of communication port Plan view showing the position change of the air outlet Plan view showing the position change of the air outlet Plan view showing the position change of the air outlet Table showing part of analysis results Graph showing noise reduction characteristics Graph showing noise reduction characteristics FIG. 3 is a view for explaining a method of designing a sound deadening chamber in Patent Document 1.

  FIGS. 1 and 2 show a general installation example of a muffling chamber. A muffler chamber 5A to 5C is provided in each of an air supply duct 2, a return air duct 3, and an outside air introduction duct 4 connected to an air conditioner 1. Separately interposed.

  In the operation of the air conditioner 1, the room air RA of the room to be air-conditioned is introduced into the air conditioner 1 through the return air duct 3 by the operation of the fan provided in the air conditioner 1, and the outside air OA for ventilation is introduced into the outside air. After being introduced into the air conditioner 1 through the duct 4, the introduced return air RA and the outside air OA are merged in the air conditioner 1, and then heated by a cooling coil, a heating coil, a humidifier, and the like provided in the air conditioner 1. The humidity is adjusted.

  Then, the adjusted air SA whose temperature and humidity have been adjusted is supplied from the air conditioner 1 to the room to be air-conditioned through the air supply duct 3 by the operation of the fan.

  Each of the muffling chambers 5A to 5C silences the fan noise leaking from the air conditioner 1 to each of the ducts 2, 3, and 4, thereby preventing the fan noise from leaking to the room to be air-conditioned or to the outside. You.

  Hereinafter, a method of designing the silencing chamber 5 that requires such a silencing effect will be described.

[First Embodiment]
The silencing chamber 5 shown in FIG. 3 has a rectangular parallelepiped shape composed of six chamber outer walls 6a to 6f, and the air inlet 7 through which the air A guided by the inflow-side duct Di flows into the chamber is a lower chamber. The outer wall 6a is formed at a corner between the left chamber outer wall 6b and the front chamber outer wall 6c.

  The air outlet 8 for allowing the air A inside the chamber to flow out to the outlet duct Do with the air inflow is formed at a corner between the upper chamber outer wall 6f and the rear chamber outer wall 6e in the right chamber outer wall 6d. I have.

  A partition wall 9 is provided inside the chamber to enhance the sound deadening effect due to the reflected sound interference inside the chamber, and the partition wall 9 is located substantially at the center between the lower chamber outer wall 6a and the upper chamber outer wall 6f. Installed in

  The partition wall 9 is in a posture parallel to the opening of the air inlet 7 formed on the lower chamber outer wall 6a, and is perpendicular to the opening of the air inlet 8 formed on the right chamber outer wall 6d. It is installed inside the chamber in a certain posture.

  By the installation of the partition wall 9, the inside of the chamber is divided into two regions, a region Z 1 on the side of the air inlet 7 and a region Z 2 on the side of the air outlet 8, and these two regions Z 1 and Z 2 Through the formed communication port 10, communication is performed in series between the air inlet 7 and the air outlet 8.

  The communication port 10 has a rectangular shape and has an opening area Sm (≧ Si, So) which is equal to or greater than the opening area Si of the air inlet 7 and the opening area So of the air outlet 8. With the securing, the pressure loss of the air A in the process of passing through the inside of the chamber is suppressed.

In this example, the air inlet 7 has an opening of 800 mm × 450 mm (Si = 0.36 m ² ) and the air outlet 8 has an opening of 1000 mm × 350 mm (So = 0.35 m ² ). The communication port 10 in the wall 9 is an opening (Sm = 0.56 m ² ) of 750 mm × 750 mm.

  Further, inside the chamber, a sound absorbing material 11 for enhancing the sound deadening effect is entirely attached to the inner surface of each of the chamber outer walls 6a to 6f and the front and back surfaces of the partition wall 9, respectively.

  In designing the noise reduction chamber 5, the size and external shape of the noise reduction chamber 5 and the positions of the air inlet 7 and the air outlet 8 are restricted depending on the condition of the installation location of the chamber. For the purpose of optimizing the position of the communication port 10 in the direction of the wall surface of the partition wall 9, when the position of the communication port 10 changes to a different position in the wall direction of the partition wall 9, the noise reduction characteristics of the Alternatively, analysis is performed by an acoustic analysis method that takes into account wave characteristics such as a difference method.

  This analysis may be performed for each case where the thickness of the sound absorbing material 11 changes to a different thickness as a change in the specification of the sound absorbing material 11 in order to optimize the sound absorbing material 11.

  In this case, in this analysis, for the combination of the position of the communication port 10 in the direction of the wall surface of the partition wall 9 and the thickness of the sound absorbing material 11, the noise reduction characteristics when the combination is changed are examined.

  Here, as a simpler method, the position of the communication port 10 is changed to a different position in the wall direction of the partition wall 9 under the condition that the sound absorbing material having a thickness of 50 mm is used for the sound absorbing material 11. Then, the respective silencing characteristics were analyzed.

  As a result, as for the position of the communication port 10 when the sound absorbing material 11 having a thickness of 50 mm was used, the position of the communication port 10 in the wall direction of the partition wall 9 changed to the position shown in each of FIGS. In this case, it was found that the silencing characteristics shown in FIGS. 5A to 5E were obtained.

  FIG. 4A shows a case where the communication port 10 is arranged at the center of the partition wall 9, and the thick solid line graph indicated by a black circle in FIG. 5A shows the silencing volume (transmission loss) at each frequency [Hz] at this time. dB].

  5a to 5e, the thin solid line graphs indicated by the circles show, as a comparative example, the silencing volume (transmission loss) [dB] at each frequency [Hz] when the partition wall 9 is not provided. I have.

  FIG. 4B shows a case where the communication port 10 is arranged at the corner between the left chamber outer wall 6b and the rear chamber outer wall 6e in the partition wall 9, and the thick solid line graph in FIG. It shows the silencing volume [dB] at each frequency [Hz].

  FIG. 4C shows a case where the communication port 10 is arranged at the corner between the left chamber outer wall 6b and the front chamber outer wall 6c in the partition wall 9, and the thick solid line graph in FIG. It shows the silencing volume [dB] at each frequency [Hz].

  FIG. 4D shows a case where the communication port 10 is disposed at a corner between the front chamber outer wall 6c and the right chamber outer wall 6d in the partition wall 9, and a thick solid line graph in FIG. The silencing volume (transmission loss) [dB] at each frequency [Hz] is shown.

  FIG. 4e shows a case where the communication port 10 is arranged at the corner between the right chamber outer wall 6d and the rear chamber outer wall 6e in the partition wall 9, and the thick solid line graph in FIG. The silencing volume (transmission loss) [dB] at each frequency [Hz] is shown.

  Comparing these analysis results, the case where the communication port 10 is arranged at the corner between the left chamber outer wall 6b and the front chamber outer wall 6c in the partition wall 9 (FIGS. 4C and 5C), and the case where the communication port 10 is partitioned When disposed at the corner between the right chamber outer wall 6d and the rear chamber outer wall 6e of the wall 9 (FIGS. 4e and 5e), relatively high noise reduction performance is obtained in the low frequency band as compared with other cases. .

  However, when the communication port 10 is disposed at a corner between the left chamber outer wall 6b and the front chamber outer wall 6c of the partition wall 9 (FIGS. 4C and 5C), the communication port 10 is provided at the right chamber outer wall of the partition wall 9. Comparing with the case where it is arranged at the corner between the rear chamber outer wall 6e and the rear chamber outer wall 6e (FIGS. 4e and 5e), the latter case can stably obtain a high noise reduction performance in the middle to high frequency band. I understand.

  From this analysis result, in the sound deadening chamber 5, the communication port 10 is arranged at a corner of the partition wall 9 between the right side chamber outer wall 6 d and the rear side chamber outer wall 6 e (FIG. 4 e), and the sound absorbing material having a thickness of 50 mm is provided. 11 is stuck inside the chamber.

  Here, in each case where the thickness of the sound absorbing material 11 changes to a different thickness as the specification change of the sound absorbing material 11, when the position of the communication port 10 in the direction of the wall surface of the partition wall 9 changes to a different position, the respective noise reductions are performed. Although an example of analyzing the characteristics has been described, simply, when the position of the communication port 10 in the wall direction of the partition wall 9 changes to a different position, the respective noise reduction characteristics are analyzed, and based on the analysis result, the partition wall 9 is analyzed. The position of the communication port 10 in the direction of the wall surface is selected, and then, when the communication port 10 is disposed at the selected position, when the thickness of the sound absorbing material 11 is changed to a different thickness, the respective noise reduction characteristics are analyzed. The thickness of the sound absorbing material 11 may be selected based on the analysis result.

[Second embodiment]
The silencing chamber 5 shown in FIG. 6 has an octahedron structure in which a corner between the upper chamber outer wall 6f and the left chamber outer wall 6b among the six chamber outer walls 6a to 6f is a concave portion 12, The recess 12 is formed by the recess upper surface chamber outer wall 6f 'and the recess left chamber outer wall 6b'.

  An air inlet 7 through which the air A guided by the inflow side duct Di flows into the inside of the chamber is formed at an upper portion of the front chamber outer wall 6c, and the air A inside the chamber flows out to the outflow side duct Do with the inflow of the air. The air outlet 8 is formed in the lower chamber outer wall 6a at a position near the left chamber outer wall 6b.

  FIG. 8 shows a chamber structure in an initial design stage of the silencing chamber 5. In the initial designing stage, the silencing chamber 5 has a flat rectangular parallelepiped shape, and the air outlet 8 of the lower chamber outer wall 6 a is provided with air. The outlet side duct Do 'in the form of a slant hopper extending obliquely to the opening surface of the outlet 8 was connected.

  After that, as shown in FIG. 6, the chamber volume is first expanded by a design change for improving the noise reduction performance.

  Specifically, in this design change, the formation of the concave portion 12 avoids interference with other objects at the chamber installation location, and the obstruction of the inclined hopper-shaped outflow-side duct Do ′ reduces the chamber. The expansion of the volume is enabled.

  Further, in this design change, a partition wall 9 is installed inside the chamber in order to enhance the noise reduction effect due to the reflected sound interference inside the chamber, and this partition wall 9 is formed by the air outlet 8 formed on the lower chamber outer wall 6a. It is installed inside the chamber in a posture parallel to the opening surface and perpendicular to the opening surface of the air inlet 7 formed in the front chamber outer wall 6c.

  Due to the installation of the partition wall 9, the inside of the chamber is divided into two regions, that is, a region Z1 on the side of the air inlet 7 and a region Z2 on the side of the air outlet 8, as shown in FIGS. 6 and 7a to 7d. These two regions Z1 and Z2 are communicated in series between an air inlet 7 and an air outlet 8 through a communication port 10 formed in a partition wall 9.

  7A is a sectional view taken along line VIIa-VIIa in FIG. 6, FIG. 7B is a sectional view taken along line VIIb-VIIb in FIG. 6, FIG. 7C is a sectional view taken along line VIIc-VIIc in FIG. 7A, and FIG. FIG.

  The communication port 10 is a rectangular opening having an opening area Sm (≧ Si, So) equal to or greater than the opening area Si of the air inlet 7 and the opening area So of the air outlet 8, and the opening area Sm , The pressure loss of the air A in the process of passing through the inside of the chamber is suppressed.

In this example, the air inlet 7 has an opening of 800 mm × 550 mm (Si = 0.44 m ² ) and the air outlet 8 has an opening of 450 mm × 800 mm (So = 0.36 m ² ). The communication port 10 in the partition wall 9 is an opening of 800 mm × 665 mm (Sm = 0.53 m ² ).

  And since it is a somewhat complicated structure provided with the recessed part 12 and the partition wall 9, the inner surface of each of the right-side chamber outer wall 6d, the rear-side chamber outer wall 6e, the left-side chamber outer wall 6b, and the front-side chamber outer wall 6c has a thickness of 150 mm or more. While the 215 mm sound absorbing material 11 is stuck, the inner surface of the lower chamber outer wall 6a and the inner surface of the upper chamber outer wall 6f secure the opening area Si of the air inlet 7 and the cross-sectional area of the air path inside the chamber. For this purpose, a sound absorbing material 11 having a thickness of 50 mm is attached.

  The portion between the outer wall 6f 'of the recess upper surface and the partition wall 9 is a narrow space, and it is difficult to secure an air path. Therefore, this portion is filled with the sound absorbing material 11 having a large thickness. It is.

  Regarding the position of the communication port 10 in the direction of the wall surface of the partition wall 9, for the purpose of optimizing the position of the communication port, first, when the position of the communication port 10 changes in the wall direction of the partition wall 9, Analyzed by an appropriate acoustic analysis method.

  As a result of this analysis, it is possible to obtain the most suitable sound deadening characteristic to satisfy the required sound deadening performance, because the corner between the right chamber outer wall 6d and the rear chamber outer wall 6e in the wall direction of the partition wall 9 can be obtained. It has been found that the communication port 10 is disposed in the space. Therefore, in the sound deadening chamber 5, the communication port 10 is provided at the corner between the right chamber outer wall 6d and the rear chamber outer wall 6e in the wall direction of the partition wall 9. Is arranged.

  In FIG. 9, a thick solid line graph indicated by a circle and a thin solid line graph indicated by a circle indicate measured values and analyzed values of the sound attenuation (transmission loss) [dB] for each frequency [Hz] in the silencing chamber 5. ing.

  In addition, a thick broken line graph indicated by ▲ and a thin broken line graph indicated by Δ in FIG. 9 show, as comparative examples, the noise reduction (transmission loss) for each frequency [Hz] in the noise reduction chamber 5 in the initial design stage shown in FIG. ) Shows measured and analyzed values of [dB].

[Third embodiment]
FIGS. 10 and 11 show a silencing chamber 5 having a rectangular parallelepiped vertical posture composed of six chamber outer walls 6a to 6f. The silencing chamber 5 in the vertical posture is close to the air conditioner 1 '. It is installed on the side of the air conditioner 1 '.

  In the silencing chamber 5, an air outlet 8 (or an air inlet 7) connected to the air conditioner 1 'is formed at an upper portion of the right-side chamber outer wall 6d, while an air inlet connected to the inflow-side duct Di. 7 (or an air outlet 8 to which the outlet duct Do is connected) is formed in the lower chamber outer wall 6a.

A partition wall 9 is installed inside the chamber in order to enhance the noise reduction effect due to the reflected sound interference inside the chamber. The noise reduction chamber 5 has a large height, and the air inlet 7 and the air outlet 8 are vertically moved. Since the partition wall 9 is largely separated in the direction, the setting form of the partition wall 9 is, for example,
As shown in FIG. 12A, a two-partition mode in which the inside of the chamber is partitioned into two regions Z1 and Z2 by one partition wall 9a,
As shown in FIG. 12B, a three-division mode in which the inside of the chamber is divided into three regions Z1 to Z3 by two partition walls 9a and 9b,
As shown in FIG. 12C, a four-division mode in which the inside of the chamber is partitioned into four regions Z1 to Z4 by three partition walls 9a to 9c is considered.

  The sound deadening characteristics of the sound deadening chamber 5 change depending on which of the two to four split forms is adopted.

  Note that, in any of the two to four division modes, all of the divided areas Z1 to Z4 are connected to the air inlet 7 through the communication ports 10a to 10c formed in the partition walls 9a to 9c. It communicates in series with the air outlet 8.

Further, in this example, the air inlet 7 and the air outlet 8 each have an opening of 1200 mm × 700 mm (Si, So = 0.84 m ² ), whereas each of the partition walls 9 a to 9 c is formed. Each of the communication ports 10a to 10c is an opening of 1580 mm × 900 mm (Sm = 1.42 m ² ).

  On the other hand, in each of these two-divided form to four-divided form, the positions of the communication ports 10a to 10c in the respective partition walls 9a, 9b, 9c (particularly, the positions in the long side direction of the respective partition walls 9a to 9c here), and The position of the air inlet 7 (or the air outlet 8) on the lower chamber outer wall 6a (particularly, in this case, the position in the long side direction of the lower chamber outer wall 6a) is also a factor that determines the noise reduction characteristics of the noise reduction chamber 5. .

  From these facts, when designing the noise reduction chamber 5, first, in the case where the above-described two-divided form to four-divided form is adopted as the installation form of the partition wall 9, the communication port in each of the partition walls 9 a to 9 c is first used. As shown in FIGS. 13a to 13c and FIGS. 14a to 14c, the positions of 10a to 10c and the position of the air inlet 7 (or the air outlet 8) on the lower chamber outer wall 6a are shown in FIGS. , 9b, 9c and the lower chamber outer wall 6a are individually analyzed in accordance with an appropriate acoustic analysis method when they are individually changed to different positions in the long side direction.

  That is, in this analysis, the number of areas of the plurality of areas Z1 to Z4 defined by the partition walls 9a to 9c, and the positions of the communication ports 10a to 10c formed in the partition walls 9a to 9c in the long side direction of the partition wall. And the position of the air inlet 7 (or air outlet 8) formed in the lower chamber outer wall 6a in the long side direction of the lower chamber outer wall, the noise reduction characteristics when the combination is changed are analyzed. You.

  FIG. 15 is a table showing a part of the analysis result. Here, the notations “front”, “middle”, and “back” indicate the communication ports 10 a to 10 b and the air inlet 7 (or the air inlet 7). When the outlet 8) is installed at a position (front position) near the front chamber outer wall 6c in the longitudinal direction of the partition walls 9a to 9b and the lower chamber outer wall 6a as shown in FIGS. As shown in FIG. 14b, when installed at the center position (middle position) between the front chamber outer wall 6c and the rear chamber outer wall 6e in the longitudinal direction of the partition walls 9a to 9b and the lower chamber outer wall 6a, and FIGS. As shown in FIG. 14C, a case is shown in which the partition walls 9a to 9b and the lower chamber outer wall 6a are installed at a position (backward position) near the rear chamber outer wall 6e in the longitudinal direction.

  The thick solid line graph indicated by the circle in FIG. 16 indicates the communication port 10a in the partition wall 9a, the communication port 10b in the partition wall 9b, and the air inlet 7 (or the air outlet 8) in the lower chamber outer wall 6a in the three-divided form. ) Indicates the silencing volume (transmission loss) [dB] at each frequency [Hz] when arranged at the “back” position, the “front” position, and the “middle” position.

  In FIG. 16, a thin solid line graph indicated by a triangle indicates a communication port 10a in the partition wall 9a, a communication port 10b in the partition wall 9b, and the air inlet 7 (or the air outlet 8) in the lower chamber outer wall 6a in the three-divided form. ) Indicate the silencing volume (transmission loss) [dB] at each frequency [Hz] when both are arranged at the “middle” position.

  In FIG. 17, a thick solid line graph indicated by a circle indicates a communication port 10a in the partition wall 9a, a communication port 10b in the partition wall 9b, a communication port 10c in the partition wall 9c, and a lower chamber outer wall 6a in the four-split form. At the respective frequencies [Hz] when the air inlet 7 (or the air outlet 8) is located at the “back” position, the “front” position, the “back” position, and the “middle” position. Loss) [dB].

  In FIG. 17, a thin solid line graph indicated by a triangle indicates a communication port 10a in the partition wall 9a, a communication port 10b in the partition wall 9b, a communication port 10c in the partition wall 9c, and air in the lower chamber outer wall 6a in the four-divided form. The inflow port 7 (or the air outflow port 8) indicates the sound extinction (transmission loss) [dB] at each frequency [Hz] when both are arranged at the “middle” position.

  In each of FIGS. 16 and 17, the broken-line graphs indicated by ● indicate that the communication port 10a in the partition wall 9a and the air inlet 7 (or the air outlet 8) in the lower chamber outer wall 6a are divided in two. , Respectively, show the silencing volume (transmission loss) [dB] at each frequency [Hz] when arranged at the “middle” position.

  Considering this analysis result, in the four-divided form, the communication port 10a in the partition wall 9a, the communication port 10b in the partition wall 9b, the communication port 10c in the partition wall 9c, and the air inlet 7 in the lower chamber outer wall 6a (or When the air outlet 8) is arranged at the “back” position, the “front” position, the “back” position, and the “middle” position, higher noise reduction performance is obtained in the low frequency band than in other cases. It can be seen that high noise suppression performance can be stably obtained even in the middle to high frequency band.

  For this reason, in the silencing chamber 5 in this vertical posture, in the four-split configuration, the communication port 10a in the partition wall 9a, the communication port 10b in the partition wall 9b, the communication port 10c in the partition wall 9c, and the lower chamber outer wall 6a are formed. Optimally, the air inlet 7 (or the air outlet 8) is arranged at the “back” position, the “front” position, the “back” position, and the “middle” position.

The inner surfaces of the chamber outer walls 6a to 6f and the front and back surfaces of the partition walls 9a to 9c are entirely covered except for the openings of the air inlet 7 and the air outlet 8 and the openings of the communication ports 10a to 10c. The sound absorbing material 11 is stuck, but when the thickness of the sound absorbing material 11 is also optimized in consideration of the noise reduction characteristics, a plurality of regions Z1 to Z4 defined by the partition walls 9a to 9c are provided. The number, the position of each communication port 10a-10c formed in each partition wall 9a-9c in the long side direction of the partition wall, and the lower surface of the air inlet 7 (or air outlet 8) formed in the lower chamber outer wall 6a. With respect to the combination of the three members with the position in the long side direction of the chamber outer wall and the thickness of the sound absorbing material 11, the noise reduction characteristics of each combination are analyzed when the combination changes,
Based on the result of this analysis, the number of the plurality of regions Z1 to Z4 partitioned by the partition wall 9, the positions of the communication ports 10a to 10c in each of the partition walls 9a to 9c, and the air inlet 7 in the lower chamber outer wall 6a. By selecting the position of (or the air outlet 8) and the thickness of the sound absorbing material 11 stuck inside the chamber,
What is necessary is just to make it possible to obtain the silencing chamber 5 having silencing characteristics suitable for satisfying the required silencing performance.

[Another embodiment]
Next, another embodiment of the present invention will be listed.

  In the above-described embodiment, the case where the thickness of the sound absorbing material 11 changes as the change in the specification of the sound absorbing material 11 has been described. However, the change in the specification of the sound absorbing material 11 is not limited to the change in the thickness. Alternatively, both the change in thickness and the change in material may be used.

  When the opening area Sm of the communication port 10 is considered in addition to the position of the communication port 10 in the wall surface direction of the partition wall 9, when the opening area Sm of the communication port 10 changes to a different opening area. When the position of the communication port 10 changes to a different position in the direction of the wall surface of the partition wall 9 for each, the silencing characteristics of each are analyzed, and based on the result of this analysis, the position of the communication port 10 in the direction of the wall surface of the partition wall 9 is determined. And the opening area Sm of the communication port 10 may be selected.

  Alternatively, when the number of the communication ports 10 in the partition wall 9 is considered in addition to the position of the communication port 10 in the wall direction of the partition wall 9, the number of the communication ports 10 changes to a different number of ports. For each of the above, when the position of the communication port 10 changes to a different position in the wall direction of the partition wall 9, the respective noise reduction characteristics are analyzed, and based on the analysis result, the communication port 10 of the communication port 10 in the wall direction of the partition wall 9 is analyzed. Each of the position and the number of the communication ports 10 in the partition wall 9 may be selected.

  When the position of the communication port 10 in the direction of the wall surface of the partition wall 9 is considered in addition to the position of the partition wall 9 inside the chamber, the position of the partition wall 9 inside the chamber changes to a different position. In each case, when the position of the communication port 10 changes to a different position in the wall direction of the partition wall 9, the respective noise reduction characteristics are analyzed, and based on the result of this analysis, the communication port in the wall direction of the partition wall 9 is analyzed. Each of the position 10 and the position of the partition wall 9 inside the chamber may be selected.

  Further, in addition to considering the position of the communication port 10 in the direction of the wall surface of the partition wall 9, in addition to considering the attitude of the partition wall 9 with respect to the opening surfaces of the air inlet 7 and the air outlet 8 in the sound deadening chamber 5. When the position of the communication wall 10 changes to a different position in the direction of the wall surface of the partition wall 9 when the position of the partition wall 9 changes to a different position with respect to the opening surfaces of the air inlet 7 and the air outlet 8 respectively. The silencing characteristics of the partition wall 9 are analyzed. Based on the result of the analysis, the position of the communication port 10 in the wall direction of the partition wall 9 and the attitude of the partition wall 9 with respect to the opening surfaces of the air inlet 7 and the air outlet 8 are each described. May be selected.

  In addition, in addition to considering the position of the communication port 10 in the direction of the wall surface of the partition wall 9, when considering other factors that may change the noise reduction characteristics, the other factors to be considered are the above-described specifications of the sound absorbing material. The position of the air inlet 7 and the air outlet 8 on the outer wall of the chamber, the opening area Sm and the number of openings of the communication port 10 on the partition wall 9, the position and posture of the partition wall 9 inside the chamber, and the inside of the chamber defined by the partition wall 9. Not limited to the number of regions, any other factors may be considered.

The silencing chamber to which the present invention is applied is not limited to the silencing chamber used in air conditioning equipment, such as a silencing chamber used in equipment for transporting substances using an air flow or equipment for supplying air for various uses. The silencing chamber used in any equipment may be used.
Further, in each of the above-described embodiments, the example in which the silencing chamber installed separately from the air conditioner is applied to the present invention is described. Instead, the silencing chamber incorporated in the air conditioner is applied to the present invention. It may be targeted.

  INDUSTRIAL APPLICATION This invention can be applied to the silencing chamber used in various fields.

Reference Signs List 7 air inlet 8 air outlet 6a to 6f chamber outer wall 9, 9a to 9c partition wall Z1 to Z4 area 10, 10a to 10c communication port 5 sound deadening chamber 11 sound absorbing material Sm opening area of communication port Si opening area of air inlet Open area of So air outlet

Claims (9)

An air inlet and an air outlet are formed in the outer wall of the chamber;
A single or plural partition walls for noise reduction are installed inside the chamber surrounded by the chamber outer wall, and the inside of the chamber is divided into a plurality of regions by the single or plural partition walls,
In the partition wall, a communication port for communicating the adjacent areas is formed,
The plurality of regions is a method for designing a sound deadening chamber that communicates in series between the air inlet and the air outlet through the communication port formed in the partition wall,
When the position of the communication port is changed to a different position in the wall direction of the partition wall, the respective silencing characteristics are analyzed,
A method for designing a sound deadening chamber in which a position of the communication port in a wall direction of the partition wall is selected based on a result of the analysis. For each case where the specification of the sound absorbing material attached to the inside of the chamber has changed to a different specification, the respective noise reduction characteristics are analyzed when the position of the communication port changes to a different position in the wall direction of the partition wall,
The method according to claim 1, wherein a position of the communication port in a wall direction of the partition wall and a specification of the sound absorbing material are selected based on a result of the analysis. For each of the cases where the position of the air inlet or the air outlet on the outer wall of the chamber has changed to a different position, the respective muffling characteristics when the position of the communication port has changed to a different position in the wall direction of the partition wall. Is parsed,
3. The muffler according to claim 1, wherein a position of the communication port in a wall direction of the partition wall and a position of the air inlet or the air outlet on the outer wall of the chamber are selected based on a result of the analysis. 4. Chamber design method. For each of the cases where the opening area of the communication port changes to a different opening area, the respective noise reduction characteristics are analyzed when the position of the communication port changes to a different position in the wall direction of the partition wall,
The method of designing a sound deadening chamber according to any one of claims 1 to 3, wherein a position of the communication port in a wall direction of the partition wall and an opening area of the communication port are selected based on a result of the analysis. . For each of the cases where the number of the communication ports in the partition wall has changed to a different number of ports, the respective muffling characteristics are analyzed when the position of the communication port changes to a different position in the wall direction of the partition wall,
The muffling according to any one of claims 1 to 4, wherein a position of the communication port in a wall direction of the partition wall and a number of the communication ports in the partition wall are selected based on a result of the analysis. Chamber design method. For each of the cases where the position of the partition wall in the chamber has changed to a different position, the respective noise reduction characteristics are analyzed when the position of the communication port has changed to a different position in the wall direction of the partition wall,
6. The muffler according to claim 1, wherein a position of the communication port in a wall surface direction of the partition wall and a position of the partition wall inside the chamber are selected based on a result of the analysis. 7. Chamber design method. For each case where the number of regions of the plurality of regions has changed to a different number of regions, the respective silencing characteristics are analyzed when the position of the communication port changes to a different position in the wall direction of the partition wall,
7. The sound deadening chamber designing method according to claim 6, wherein a position of the communication port in a wall direction of the partition wall and a number of the plurality of regions are selected based on a result of the analysis. For each of the cases where the position of the partition wall with respect to the opening surface of the air inlet and the air outlet respectively changes to a different position, when the position of the communication port changes to a different position in the wall direction of the partition wall, respectively. The silencing characteristics of the
The position of the communication port in the wall direction of the partition wall, and the attitude of the partition wall with respect to the respective opening surfaces of the air inlet and the air outlet based on the result of the analysis. 8. The method for designing a sound deadening chamber according to claim 7. A sound deadening chamber designed using the sound deadening chamber designing method according to any one of claims 1 to 8,
A muffling chamber, wherein an opening area of the communication port is larger than an opening area of each of the air inlet and the air outlet;

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