JP6196166B2 - Simulation method of combined performance of ventilation fan and silencer chamber - Google Patents

Description

  The present invention relates to a ventilation fan and a silencing chamber capable of supporting the examination of a combination of a ventilation fan and a silencing chamber in order to design a ventilation facility that can satisfy both a noise reduction amount and a pressure loss value. The present invention relates to a method for simulating a combination performance.

  Conventionally, buildings and the like have been provided with ventilation equipment. The ventilation facility is configured by a fan and a muffler chamber through which air from the fan flows. As this type of technology, in the “silencer” of Patent Document 1, the silencer includes a supply port that supplies a gas flow, a discharge port that discharges the gas flow, and a hollow that exists between the supply port and the discharge port. And a partition member that is provided on the substrate and partitions the hollow chamber of the substrate into a meandering bent passage that bends in a meandering manner.

  In addition, the “interference silencer chamber” of Patent Document 2 is provided with a gas inlet and an outlet in a box, and a gas flowing from the inlet toward the outlet is divided, and the divided gases are separated from each other. The box is formed by partitioning the inner space of the box body by a partition member arranged in a state in which the inflow port is divided into a set of parallel airflow paths composed of a plurality of airflow paths for silencing that are merged through ventilation paths of different lengths. It is formed inside the body, and all the silencing air passages are refracting air passages having a refractive ventilation path portion, and the flow direction of the gas and the propagation direction of the sound to be silenced propagating through the gas are the same direction. On the other hand, as the parallel air passage set, a plurality of parallel air passage sets on the inlet side consisting of a plurality of air inlet silencing air passages having different ventilation path lengths are provided in parallel, and the length of the air passage path Of multiple outlets that are different from each other A parallel air passage set on the outlet side composed of a sound air passage is provided, and the plurality of parallel air passage sets on the inlet side includes a plurality of gas outlets of the muffler air passage on the inlet side forming each The end portions on the side are individually provided with the merge portions, and these individual merge portions are individually positioned in different box internal space portions partitioned by the partition members, and are arranged on the outlet side. The plurality of outlet-side silencing air passages forming the parallel air passage set are configured to be air passages in which each of the individual merging portions having different positions is an end portion on the gas inlet side.

JP 2006-125214 A Japanese Patent No. 4575121

  The silencer has better performance as the noise reduction amount is larger and the pressure loss is smaller. Conventionally, the silencer is designed and manufactured so as to satisfy a predetermined target performance, and therefore, when using a combination of ready-made members, it tends to be over-spec. The silencer chamber as a silencer has few restrictions on the shape for obtaining the effect, and can obtain a large noise reduction performance depending on the device.

  In order to improve the noise reduction performance of the silencing chamber, it is conceivable to provide a shielding plate that suppresses noise propagation in the silencing chamber. If the air flow path in the silencer is shielded by the shielding plate, the noise reduction performance is improved, but the necessary air flow cannot be obtained.

  In designing the ventilation equipment, it is necessary to consider both the noise reduction amount of the silencing chamber and the pressure loss. In relation to the amount of noise reduction and the pressure loss, it is further necessary to consider the combination of the ventilation volume of the ventilation fan to be used and the sound generated during the ventilation. However, in the conventional design method, since the noise reduction amount and the pressure loss are separately examined, there is a problem that it is difficult to design a ventilation facility with good performance.

  The present invention was devised in view of the above-mentioned conventional problems, and in order to design a ventilation facility that can satisfy both a noise reduction amount and a pressure loss value, a combination of a ventilation fan and a silencing chamber is studied. It is an object of the present invention to provide a simulation method for the performance of a combination of a ventilation fan and a silencing chamber capable of supporting the above.

  The simulation method of the combined performance of the ventilation fan and the silencing chamber according to the present invention is provided at any arrangement position between the ventilation fan and the ventilation inlet and the ventilation outlet through which the ventilation from the fan circulates. A method for simulating the combination performance with a silencer chamber having a shielding plate that projects from a ventilation path communicating with the ventilation inlet and the ventilation outlet and shields a part of the ventilation path. The fan volume of the air flow and the sound generated during the air blowing, and the size of the muffler chamber including the size of the air inlet and the size of the air outlet are set at a predetermined pitch so as to be changeable. A plurality of chamber data and a plurality of arrangement positions of the shielding plates and a shielding area ratio of the air blowing path at the arrangement positions at a predetermined pitch so as to be changeable; Preliminarily created comprising: defined shielding plate related data; and pressure loss values and noise reduction performance value data associated with the fan data, the chamber data, and the shielding plate related data. Using the database, the shielding data related to the shielding plate is referred to the fan data and the chamber data of the fan and the silencing chamber to be simulated, and the combined performance of the fan and the silencing chamber The performance value data is extracted.

Of the pressure loss value and noise reduction amount extracted from the performance value data based on the fan data and the chamber data of the fan and the silencing chamber to be simulated, the pressure loss value is smaller than the target pressure loss value. When the noise reduction amount is smaller than the target noise reduction amount, in the first step, based on the shielding plate related data, the shielding plate is placed between the ventilation inlet and the ventilation outlet of the silencing chamber. The pressure loss value and the noise reduction amount when the shielding area ratio is changed at a predetermined pitch by arranging in the center are extracted from the performance value data,
Next, when any of the plurality of noise reduction amounts extracted in the first step is larger than the target noise reduction amount, the noise reduction amount extracted in the first step is then reduced to the target noise reduction in step 2a. With respect to the minimum shielding area ratio satisfying the amount, the pressure loss value when the arrangement position of the shielding plate is changed at a predetermined pitch is extracted from the performance value data based on the shielding plate related data.

Of the pressure loss value and noise reduction amount extracted from the performance value data based on the fan data and the chamber data of the fan and the silencing chamber to be simulated, the pressure loss value is smaller than the target pressure loss value. When the noise reduction amount is smaller than the target noise reduction amount, in the first step, based on the shielding plate related data, the shielding plate is placed between the ventilation inlet and the ventilation outlet of the silencing chamber. The pressure loss value and the noise reduction amount when the shielding area ratio is changed at a predetermined pitch by arranging in the center are extracted from the performance value data,
Next, when any of the plurality of noise reduction amounts extracted in the first step is larger than the target noise reduction amount, the noise reduction amount extracted in the first step is then reduced to the target noise reduction in the second step b. For all shielding area ratios satisfying the amount, the noise reduction amount and the pressure loss value when the arrangement position of the shielding plate is changed at a predetermined pitch are extracted from the performance value data based on the shielding plate related data. It is characterized by.

  Of the plurality of pressure loss values extracted in the step 2a or step 2b, the minimum pressure loss value smaller than the target pressure loss value is selected again as another ventilation fan with a small air flow rate. The simulation process is performed, and the ventilation fan with the minimum air flow is extracted, and the simulation process is terminated.

  When the plurality of pressure loss values extracted in the step 2a or the step 2b are all larger than the target pressure loss value, the simulation process is performed by selecting another ventilation fan having a large air flow rate. It is made to be made.

  If the noise reduction amount extracted in the first step is smaller than the target noise reduction amount, then, in the third step, the pressure loss value extracted in the first step satisfies the target pressure loss value. With respect to the shielding area ratio, a noise reduction amount when the arrangement position of the shielding plate is changed at a predetermined pitch is extracted from the performance value data based on the shielding plate related data.

  When any of the plurality of noise reduction amounts extracted in the third step is larger than the target noise reduction amount, the simulation process is terminated, and all of the plurality of noise reduction amounts extracted in the third step are the target noise. If the amount is smaller than the reduction amount, the simulation process is performed by selecting another ventilation fan with a small air flow rate.

  The step 2a and the step 2b are sequentially performed.

  In the simulation method of the combined performance of the ventilation fan and the silencing chamber according to the present invention, the ventilation fan and the silencing chamber can be designed so that a ventilation facility that can satisfy both the noise reduction amount and the pressure loss value can be designed. Can be considered for the combination.

It is a longitudinal cross-sectional view at the time of fracture | rupturing the silencer chamber which is an examination object example of the simulation method of the combined performance of the fan for ventilation and the silencer chamber which concerns on this invention in the surface along the direction which goes to the exterior from the inside. It is explanatory drawing which shows an example of the shielding board used as the shielding area ratio 75% in suitable one Embodiment of the simulation method of the combined performance of the fan for ventilation and the silencing chamber which concerns on this invention. In a preferred embodiment of the simulation method of the combined performance of the ventilation fan and the silencing chamber according to the present invention, the arrangement position of the shielding plate can be changed between the ventilation inlet and the ventilation outlet without changing the height of the shielding plate. It is explanatory drawing explaining the relationship between the noise reduction amount by a silencing chamber when it moves between, and a pressure loss value. In a preferred embodiment of the simulation method of the combined performance of the ventilation fan and the silencing chamber according to the present invention, the noise reduction amount by the silencing chamber when the shielding plate is fixed and the shielding area ratio is changed It is explanatory drawing explaining the relationship between a pressure loss value. It is a flowchart which shows the process of the initial stage performance confirmation process in suitable one Embodiment of the simulation method of the combined performance of the fan for ventilation and the silencing chamber which concerns on this invention. It is a flowchart which shows the process of the 1st process following an initial stage performance confirmation process. It is a flowchart which shows the process of the 2a process following a 1st process. It is a flowchart which shows the process of the 3rd process following a 1st process. It is a flowchart which shows the process of the 2b process following a 1st process which can be performed instead of or in addition to the 2a process shown in FIG.

  Hereinafter, a preferred embodiment of a method for simulating combined performance of a ventilation fan and a silencing chamber according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a longitudinal cross-sectional view when the noise reduction chamber is broken along a plane along the direction from the room toward the outside. FIG. 2 is a diagram illustrating an example of the shielding plate 3 having a shielding area ratio of 75%.

  The muffler chamber 1 is provided, for example, in a ventilation part such as a building, and the ventilation of a ventilation fan (not shown) is distributed. As shown in FIG. 1, the silencing chamber 1 is provided with an air inlet 1a and an air outlet 1b, and is provided in a main body 2 that forms a rectangular parallelepiped space, and an air passage 1c described later. And a shielding plate 3 to be used. A sound absorbing material 4 is attached to the inner surface of the main body 2 and the surface of the shielding plate 3. In the present embodiment, glass wool is used as the sound absorbing material 4, but is not limited thereto.

  The blower intake port 1a and the blower discharge port 1b provided in the main body unit 2 face one indoor or outdoor, and are provided one by one on the wall 2a facing each other. The blower inlet 1a and the blower outlet 1b have different vertical positions. For example, the blower inlet 1a on the outdoor side is on the upper end side of the main body 2 and the blower outlet 1b on the indoor side is the main body 2. It is arranged on the lower end side. Thereby, it forms so that indoors and outdoors cannot be seen in the horizontal direction.

  In the following description, as shown in FIG. 1 and FIG. 2, in the longitudinal section of the muffler chamber 1, the upper and lower edges of the blower intake port 1a and the blower discharge port 1b are connected to each other. The cylindrical space is referred to as a blower path 1c.

  The lines connecting the upper edges and the lower edges of the air inlet 1a and the air outlet 1b are not necessarily parallel. Therefore, the cross-sectional area Sa of the air flow path 1c when the air flow path 1c is broken at a plane orthogonal to the indoor / outdoor direction, that is, a plane parallel to the wall portion 2a provided with the air intake port 1a and the air discharge port 1b, It differs depending on the breaking position in the indoor / outdoor direction. The blower path 1c can be seen obliquely from the blower intake port 1a to the blower discharge port 1b in the state where the shielding plate 3 is not provided in the silencer chamber 1.

  The shielding plate 3 is erected from the lower surface of the main body 2 between the air inlet 1a and the air outlet 1b in parallel with the wall 2a where the air inlet 1a and the air outlet 1b are provided. The upper end part side protrudes in the ventilation path 1c. When the shielding plate 3 is provided in the silencer chamber 1, a portion that cannot be seen from the air inlet 1a to the air outlet 1b, that is, a portion where the air passage 1c is shielded occurs.

  Since the cross-sectional area Sa of the ventilation path 1c changes according to the arrangement position where the shielding board 3 is arrange | positioned between the ventilation inlet 1a and the ventilation outlet 1b of the main-body part 2, the height of the shielding board 3 is constant. Even so, the area Sb where the ventilation path 1c is shielded by the shielding plate 3 varies depending on the arrangement position of the shielding plate 3.

  In the following description, the amount by which the air passage 1c is shielded by the shielding plate 3 is the amount of the shielding plate 3 relative to the cross-sectional area Sa of the air passage 1c when the shielding plate 3 is broken at the surface along the shielding plate 3. Is indicated by the ratio of the area Sb that protrudes into the air passage 1c and is shielded (hereinafter referred to as “shielding area ratio [Sb / Sa]”).

  For example, as shown in FIG. 3, when the shielding plate 3 is arranged at a certain arrangement position I, the shielding area ratio is a direct sound when there is no cross-sectional area Sa of the ventilation path 1c at the arrangement position I, that is, the shielding plate 3. When the cross-sectional area Sa of the region where the air reaches the air discharge port is 100%, the area Sb where the shielding plate 3 protrudes from the air flow path 1c is 3/4 of the cross-sectional area Sa of the air flow path 1c. Shown as 75%.

  FIG. 3 shows the noise reduction amount and pressure of the silencing chamber 1 when the arrangement position I of the shielding plate 3 is moved between the air intake port 1a and the air exhaust port 1b without changing the height of the shielding plate 3. It is a figure which shows a loss value. As shown in FIGS. 3A and 3B, it cannot be generally said that the noise reduction amount and the change in the pressure loss value due to the movement of the shielding plate 3 exhibit a certain tendency.

  FIG. 4 is a diagram showing a noise reduction amount and a pressure loss value of the silencing chamber 1 when the shielding plate 3 is fixed at a predetermined arrangement position I and the shielding area ratio is changed (the height of the shielding plate 3 is changed). It is.

  As shown in FIGS. 3 and 4, the noise reduction amount and the pressure loss value of the silencing chamber 1 vary depending on the arrangement position I of the shielding plate 3 and the projection amount (shielding area ratio) of the shielding plate 3 to the ventilation path 1 c. . Therefore, when the shielding plate 3 is provided, it is necessary to consider the arrangement position I of the shielding plate 3 and the projection amount (shielding area ratio) of the shielding plate 3 to the blower path 1c.

  According to the simulation method of the combined performance of the ventilation fan and the silencing chamber 1 according to the present invention, the noise reduction amount and the pressure loss value are selected for the silencing chamber 1 in which the selected fan and size are set to be changeable at a predetermined pitch. In both cases, it is possible to set the arrangement position I of the shielding plate 3 and the shielding area ratio of the shielding plate 3 so as to satisfy the set target value.

  The simulation method of the present invention is realized by a control unit of a computer including an input unit such as a keyboard and a mouse, an output unit such as a display and a printer, a calculation unit and a storage unit.

  In the storage unit of the computer, a program for realizing a method for simulating the combined performance of the ventilation fan and the silencing chamber 1, and a database and a sound absorbing material database to be described later are stored in advance.

  The database used for the simulation method of the combined performance of the ventilation fan and the silencing chamber 1 of the present invention includes “fan data”, “chamber data”, “shielding plate related data”, fan data, chamber data, and It consists of “performance value data” associated with a mutual combination of shielding plate related data, created in advance and stored in the storage unit.

  “Fan data” is data of the “fan performance value” of the air flow rate and the sound generated during the air flow of each of a plurality of selectable ventilation fans. Usually, when the amount of blown air is large, the generated sound tends to increase.

  The “chamber data” is data of a plurality of “size values” of the muffler chamber 1 that can be resized and can be changed at a predetermined pitch. Specifically, the size of the muffler chamber 1 includes the height of the air inlet 1a and the air outlet 1b, and is the width and height of the main body 2 and the depth in the indoor / outdoor direction. A plurality of size values indicating each size such as the width of the main body 2 are set, for example, at a pitch of 5 cm, and these size values constitute chamber data.

  The “shielding plate related data” is the ratio of the shielding plate 3 to the arrangement position I and the shielding area ratio at the arrangement position I, and is data related to a plurality of shielding plates related to the shielding plate 3 set to be changeable at a predetermined pitch. It is.

  The arrangement position I of the shielding plate 3 is, for example, 5 cm pitch on the air inlet 1a side and the air outlet 1b side with respect to the distance between the air inlet 1a and the air outlet 1b, that is, the center of the depth of the main body 2. A plurality of distance values indicating the distance to the moved position are set. As the distance value, the distance to reach the wall portion 2a where the air intake port 1a and the air discharge port 1b are provided is set.

  With respect to each distance value corresponding to the arrangement position I, a plurality of shielding area ratios are set at each arrangement position I so that the shielding area ratio is 0 to 100%, for example, at a 5% pitch.

  Each distance value and each shielding area ratio constitutes shielding plate related data relating to the shielding plate.

  “Performance value data” is pressure loss value and noise reduction amount, fan data of any “fan performance value”, chamber data of any “size value” and any “positioning position of shielding plate” And the data of the combination result of the fan for ventilation and the silencing chamber 1 constituted by the combination of the shielding plate related data of “the shielding area ratio at the arrangement position”. The performance value data is created in advance for all combinations of fan data, chamber data, and shielding plate related data, and is stored in the storage unit. Specifically, the performance value data specifies one of the set chamber data and one of the set shielding plate related data for the selected ventilation fan, so that the ventilation fan and the silencing chamber are specified. 1 is extracted as a combination performance with 1.

  The database is based on performance specifications of various fans, each size value such as a 5 cm pitch, shielding plate related values obtained by combining each distance value and each shielding area ratio, and analysis or experiment on various silencing chambers 1. Each noise reduction amount and each pressure loss value data are associated with each other.

  All noise reduction and pressure loss values corresponding to each combination of fan data, chamber data and shielding plate related data may not be all analyzed or experimental data. Data in which values between them are complemented by calculation or the like based on the analysis and experiment. In the sound absorbing material database, a plurality of types of sound absorbing materials 4 having different materials are associated with their sound absorption rates.

  The simulation method of the combined performance of the ventilation fan and the silencing chamber 1 according to the present embodiment is used, for example, to examine the combination of the ventilation fan and the silencing chamber 1 suitable for ventilation equipment installed in a building or the like. It is done. For example, in a building such as a factory, a combination of a fan for ventilation and a sound deadening chamber 1 having a ventilation inlet and a ventilation outlet is considered in the design stage. In the following description, the temporarily set size of the muffler chamber 1 is referred to as a temporary size. In the examination stage, a target noise reduction amount and a target pressure loss value are also set as target performance values based on the combination of the fan and the silencing chamber 1.

  The simulation method of the combined performance of the ventilation fan and the muffler chamber 1 according to the present embodiment is basically between the ventilation fan and the air inlet 1a and the air outlet 1b through which the air from the fan circulates. The silencing chamber having a shielding plate 3 that projects from the air passage 1c that communicates the air inlet 1a and the air outlet 1b and shields a part of the air passage 1c. 1 is a method for simulating the performance of a combination with the fan 1, and the silencer chamber 1 includes the air volume and the fan data of the sound generated when the air is blown, and the size of the air inlet 1a and the size of the air outlet 1b. Chamber data in which a plurality of sizes can be changed at a predetermined pitch, and the arrangement position I of the shielding plate 3 and the shielding of the ventilation path 1c at the arrangement position Shield plate related data in which the product ratio is set at a predetermined pitch so that the product ratio can be changed; pressure loss value and noise reduction performance value data associated with the mutual combination of fan data, chamber data and shield plate related data And the fan-related data of the shielding plate 3 is referred to the fan data and the chamber data of the fan to be simulated and the silencing chamber 1 and the chamber data. Performance value data is extracted as a combination performance with.

  Assuming the case where the noise reduction amount and the pressure loss value have the tendency shown in FIG. 3A, the pressure loss extracted from the performance value data based on the fan data and the chamber data of the fan to be simulated and the silencing chamber 1 When the pressure loss value is smaller than the target pressure loss value and the noise reduction amount is smaller than the target noise reduction amount among the values and the noise reduction amount, the shielding plate 3 is continuously based on the shielding plate related data in the first step. Is placed in the center between the air inlet 1a and the air outlet 1b of the muffler chamber 1, and the pressure loss value and the noise reduction amount when the shielding area ratio is changed at a predetermined pitch are extracted from the performance value data. When any of the plurality of noise reduction amounts extracted in the first step is larger than the target noise reduction amount, the noise reduction extracted in the first step is thereafter performed in step 2a. For the minimum shielding area ratio that satisfies the target noise reduction amount, based on the shielding plate related data, the pressure loss value when the arrangement position I of the shielding plate 3 is changed at a predetermined pitch is extracted from the performance value data. ing.

  Further, assuming that the noise reduction amount and the pressure loss value have the tendency shown in FIG. 3B, the fan is extracted from the performance value data based on the fan data and the chamber data of the silencing chamber 1 and the fan to be simulated. Of the pressure loss value and the noise reduction amount, when the pressure loss value is smaller than the target pressure loss value and the noise reduction amount is smaller than the target noise reduction amount, in the first step, the shielding is performed based on the shielding plate related data. The pressure loss value and the noise reduction amount are extracted from the performance value data when the plate 3 is arranged in the center between the air inlet 1a and the air outlet 1b of the silencer chamber 1 and the shielding area ratio is changed at a predetermined pitch. Then, when any of the plurality of noise reduction amounts extracted in the first step is larger than the target noise reduction amount, the noise extracted in the first step is then in step 2b. For all shielding area ratios where the reduction amount satisfies the target noise reduction amount, the noise reduction amount and pressure loss value when the arrangement position I of the shielding plate 3 is changed at a predetermined pitch based on the shielding plate related data are performance value data. Extracted from.

  Of the plurality of pressure loss values extracted in step 2a or step 2b, simulation is performed by selecting another ventilation fan with a small air flow rate for the minimum pressure loss value smaller than the target pressure loss value. Processing is performed, and the ventilation fan with the minimum air flow is extracted, and the simulation processing is terminated.

  When the plurality of pressure loss values extracted in the step 2a or the step 2b are all larger than the target pressure loss value, the simulation process is performed by selecting another ventilation fan having a large air flow rate. It has become so.

  If the noise reduction amount extracted in the first step is smaller than the target noise reduction amount, then the maximum shielding area where the pressure loss value extracted in the first step satisfies the target pressure loss value in the third step. Regarding the ratio, the noise reduction amount when the arrangement position of the shielding plate 3 is changed at a predetermined pitch based on the shielding plate related data is extracted from the performance value data.

  When any of the plurality of noise reduction amounts extracted in the third step is larger than the target noise reduction amount, the simulation process is terminated, and all of the plurality of noise reduction amounts extracted in the third step are the target noise reduction amount. If it is smaller than that, the simulation process is performed by selecting another ventilation fan with a small air flow rate.

  Furthermore, the 2a process and the 2b process may be performed sequentially.

  Specifically, when the combined performance value of the fan and the silencing chamber 1 is simulated by the simulation method according to the present embodiment, the performance (air flow and generated sound) of the temporary ventilation fan to be simulated and the silencing A temporary size is determined for the width, height and depth of the main body 2 of the chamber 1 and the height of the air inlet 1a and the air outlet 1b, and a target noise reduction amount and a target pressure loss value are determined. It is executed from the initial performance confirmation process.

  In the simulation method described below, when examining the combined performance of the fan and the silencing chamber 1, the setting of the fan is changed first, and when there is no optimum fan, the setting of the silencing chamber 1 is changed. I have to.

  FIG. 5 is a flowchart showing the process of the initial performance confirmation process. As shown in FIG. 5, in this step, first, a temporary size of the muffler chamber 1 to be simulated (“size value” of the chamber data) is stored from the database to a computer that executes a program for realizing the simulation method. Is read (STEP 1). Next, the fan performance (“fan performance value” of the fan data) of the ventilation fan (which is temporarily selected) to be simulated is read from the database (STEP 2). Further, the target noise reduction amount and the target pressure loss value are input to the computer from its input unit (STEP 3). After the input, the simulation process is started.

  From the sound absorbing material database, the type of the sound absorbing material 4 provided in the main body 2 and, if necessary, provided on the shielding plate 3 is read out, and information on the type and sound absorption rate of the sound absorbing material 4 determined by the selection operation. Is acquired by the computer (STEP 4).

  The read sound absorption rate, the “fan performance value” of the fan to be simulated, the temporary size of the main body 2 of the silencer chamber 1 to be simulated, the height and the depth, and the blower intake port 1a and the blower discharge port 1b. Based on the “size value” that is the temporary size of the height, the noise reduction amount and the pressure loss value are extracted from the database as the “performance value” in the silencer chamber 1 in which the shielding plate 3 is not provided (STEP 5).

  The extracted pressure loss value is smaller than the target pressure loss value (in the figure, the target pressure loss value is expressed as a target value in relation to the pressure loss value) (STEP 6: YES), and the extracted noise reduction amount Is larger than the target noise reduction amount (in the figure, the target noise reduction amount is expressed as a target value in relation to the noise reduction amount) (STEP 7: YES), that is, the extracted pressure loss value and noise reduction amount are the target. When the pressure loss value and the target noise reduction amount are satisfied, for example, that effect is displayed on the display, and the simulation process ends (END).

  At this time, with respect to the selected fan, the silencer chamber 1 has a read-in temporary-size air intake port 1a and a blow-out port 1b, and only provides the sound-absorbing material 4 on the read-in temporary size main body 2. The simulation result that the target performance can be obtained without providing the shielding plate 3 is obtained.

  When the extracted pressure loss value is larger than the target pressure loss value (STEP 6: NO), the performance of the fan is too small (the air flow rate is too small). In this case, it is necessary to reselect a fan having a large fan performance with respect to the muffler chamber 1, and it is determined whether or not the current fan is the maximum fan that can be selected (STEP 8). If it is the largest fan (STEP 8: YES), the size value of the muffler chamber 1 is changed (STEP 1), and the above procedure is executed again. If it is not the maximum fan (STEP 8: NO), the setting is changed to a new fan with high fan performance (STEP 9), the fan performance value of the new fan is read from the database (STEP 2), and the above procedure is executed again. The

  If the extracted pressure loss value is smaller than the target pressure loss value (STEP 6: YES), but the extracted noise reduction amount is smaller than the target noise reduction amount (STEP 7: NO), the process proceeds to the first step.

  In the processing up to this point, if the pressure loss value does not satisfy the target pressure loss value for the silencer chamber 1 and the fan without the shielding plate 3 (STEP 6: NO), it is not necessary to consider the noise reduction amount. If the fan cannot be selected again, the size of the silencer chamber is changed and the setting is reset.

  When the target pressure loss value is satisfied (STEP 6: YES), the noise reduction amount is examined next. When the noise reduction amount does not satisfy the target noise reduction amount (STEP 7: NO), the shielding plate 3 In the first silencing chamber 1, further examination is performed in consideration of the shielding area ratio among the shielding plate related data.

  Of course, if the pressure loss value and the noise reduction amount satisfy the target pressure loss value and the target noise reduction amount for the silencer chamber 1 and the fan without the shielding plate 3 (STEP 7: YES), the simulation ends (END). ).

  FIG. 6 is a flowchart showing the process of the first step. In the first step, data corresponding to the temporary size of the width, height, and depth of the main body 2 of the silencer chamber 1 set in STEP 1 and the temporary size of the height of the air inlet 1a and the air outlet 1b is set from STEP 1. In addition, when the arrangement position I of the shielding plate 3 is the center of the air inlet 1a and the air outlet 1b, the noise reduction amount and the pressure loss value corresponding to each shielding area ratio of each area ratio parameter are Extracted (STEP 10).

  That is, with respect to the shielding plate 3, the noise reduction amount and pressure corresponding to each shielding area ratio every 5% between the shielding area ratios of 0 to 100% at the center between the ventilation inlet 1 a and the ventilation outlet 1 b. Loss values are extracted sequentially.

  The extracted noise reduction amount is compared with the target noise reduction amount by the computer (STEP 11). When any of the noise reduction amounts associated with the shielding area ratios every 5% between the shielding area ratios of 0 to 100% satisfies the target noise reduction amount (STEP 11: YES), the process proceeds to step 2a. Transition.

  When the noise reduction amount associated with the shielding area ratio every 5% between the shielding area ratios 0 to 100% does not satisfy the target noise reduction amount (STEP 11: NO), the process proceeds to the third step.

  In the first step, when the noise reduction amount is studied in consideration of the shielding area ratio of the shielding plate 3 (the center of the blower inlet 1a and the blower outlet 1b), the pressure loss value changes due to the presence of the shield plate 3. In step 2a, the pressure loss value is reviewed on the condition that the noise reduction amount satisfies the target noise reduction amount. On the other hand, in the third step, the noise reduction amount still does not satisfy the target noise reduction amount based on the fact that the pressure loss value met the target pressure loss value in the previous initial performance confirmation step. Review noise reduction and pressure loss values to further examine the data.

  FIG. 7 is a flowchart showing the process of step 2a. Step 2a supports the examination when the pressure loss value is larger than the target pressure loss value when the noise reduction amount satisfies the target noise reduction amount. If the minimum pressure loss value is found when the noise reduction amount satisfies the target noise reduction amount, and the pressure loss value satisfies the target pressure loss value, whether or not the fan performance can be further reduced Is considered. On the other hand, if a satisfactory pressure loss value cannot be found, the setting is made so that the performance of the fan is increased so that the examination is performed again.

  In the 2a step, the position of the shielding plate 3 is set to the center with respect to the minimum shielding area ratio at the central position of the air intake port 1a and the air discharge port 1b in which the noise reduction amount satisfies the target noise reduction amount in STEP 11 of the first step. The amount of noise reduction when moving several pitches from is extracted from the database (STEP 12). By this processing, the arrangement position I of the shielding plate 3 is moved from the reference position toward either the air inlet 1a side or the air outlet 1b side with the center of the air inlet 1a and the air outlet 1b as the reference position. Confirm that the amount of noise reduction is greater when the

  Specifically, in STEP 12, from the database, on the precondition that the shielding plate 3 corresponds to the temporary size of the silencer chamber 1 and the shielding plate 3 has the minimum shielding area ratio, the arrangement position I of the shielding plate 3 is determined from the center (0). For example, noise reduction amounts are extracted when the air intake ports 1a and the air discharge ports 1b are arranged at positions of about 5 pitches, for example, at intervals of 25 cm.

  Based on the extracted noise reduction amount, it is determined whether the arrangement position I of the shielding plate 3 is arranged on either the air intake port 1a side or the air discharge port 1b side, so that the noise reduction amount can be further increased. (STEP 13). Thereby, in future examination, even if the arrangement position I of the shielding board 3 is moved from the said center, a noise reduction amount will not become small.

  Here, although the example (STEP13: YES) which arrange | positions the shielding board 3 to the ventilation inlet 1a side is demonstrated, when arrange | positioning to the ventilation outlet 1b side, the position which arrange | positions the shielding board 3 moves to an opposite direction. Since other processes and the like are not changed, the same STEP numbers are assigned in FIG.

  When it is determined that the noise reduction amount can be further increased by arranging the shielding plate 3 on the air intake port 1a side (STEP 13: YES), the arrangement position I of the shielding plate 3 is set to the air intake port 1a and the air discharge port 1b. The pressure loss value when moving 1 pitch (5 cm) from the center (0) to the air inlet 1a side (STEP 14) is extracted from the database (STEP 15).

  Thereafter, the installation position I of the shielding plate 3 is further moved by one pitch (STEP 16), and the pressure loss value at that time is extracted from the database (STEP 15). Repeat until reaching (STEP 17). Thereafter, the minimum value of the pressure loss value extracted in this process is selected (STEP 18).

  Next, when the minimum value of the pressure loss value is smaller than the target pressure loss value (STEP 19: YES), the next step is to examine the performance value of the fan and confirm that it is the minimum as a combined fan. (STEP 20: YES) The simulation is terminated. On the other hand, if it is not the smallest fan (STEP 20: NO), a smaller fan is selected again (STEP 21), the process returns to STEP 2, and the simulation is executed again.

  If the pressure loss value is larger than the target pressure loss value in STEP19 (STEP19: NO), it is determined whether this is the first examination result, and if it is the first examination result (STEP22: YES). In order to check whether or not the fan under consideration is the maximum selectable fan so that the target pressure loss value can be set to a large value again, the process returns to STEP8. If it is not the first examination result (STEP 22: NO), the previous examination result is output as a simulation result (STEP 23), and the simulation is terminated. When the simulation is finished, the fan examined last time is the smallest fan that can satisfy both the target noise reduction amount and the target pressure loss value.

  As described above, in step 2a, the shielding plate 3 is moved in the direction in which the noise reduction amount increases, and the arrangement position I of the shielding plate 3 with the smallest pressure loss value is examined.

  FIG. 8 is a flowchart showing the process of the third step. The third step supports the examination when the noise reduction amount does not satisfy the target noise reduction amount even if the shielding area ratio is 100% in the first step. In a state where the pressure loss value satisfies the target pressure loss value, the shielding plate 3 is moved in the direction in which the noise reduction amount increases, and the simulation is terminated when the target noise reduction amount is satisfied. When the noise reduction amount does not satisfy the target noise reduction amount, the setting is made so that the performance of the fan is reduced so that the examination is performed again.

  In the third step, the shielding area ratio of the shielding plate 3 is the maximum shielding area ratio in which the pressure loss value satisfies the target pressure loss value in the first step, and the position of the shielding plate 3 is moved by several pitches from the center. The amount of noise reduction is extracted from the database (STEP 24). By this processing, the arrangement position I of the shielding plate 3 is moved from the reference position toward either the air inlet 1a side or the air outlet 1b side with the center of the air inlet 1a and the air outlet 1b as the reference position. Confirm that the amount of noise reduction is greater when the

  Specifically, in STEP 24, from the database, on the precondition that the shielding plate 3 corresponds to the temporary size of the silencer chamber 1 and the shielding plate 3 has the maximum shielding area ratio, the arrangement position I of the shielding plate 3 is determined from the center (0). For example, noise reduction amounts are extracted when the air intake ports 1a and the air discharge ports 1b are arranged at positions of about 5 pitches, for example, at intervals of 25 cm.

  Based on the extracted noise reduction amount, it is determined whether the arrangement position I of the shielding plate 3 is arranged on either the air intake port 1a side or the air discharge port 1b side, so that the noise reduction amount can be further increased. (STEP 25). Thereby, in future examination, even if the arrangement position I of the shielding board 3 is moved from the said center, a noise reduction amount will not become small.

  Here, although the example (STEP25: YES) which arrange | positions the shielding board 3 to the ventilation inlet 1a side is demonstrated, when arrange | positioning to the ventilation outlet 1b side, the position which arrange | positions the shielding board 3 moves to an opposite direction. Since other processes and the like are not changed, the same STEP numbers are assigned in FIG.

  If it is determined that the amount of noise reduction can be increased by arranging the shielding plate 3 on the air intake port 1a side (STEP 25: YES), the arrangement position I of the shielding plate 3 is set to the air intake port 1a and the air discharge port 1b. A pressure loss value and a noise reduction amount are extracted from the database (STEP 27) when moving 1 pitch (5 cm) from the center (0) to the air intake port 1a side (STEP 26).

  Thereafter, the process of extracting the pressure loss value and the noise reduction amount from the database by moving the installation position I of the shielding plate 3 by one pitch (STEP 29) and extracting the pressure loss value at that time from the database (STEP 27). It repeats until it reaches the wall 2a (STEP 30). If it is determined that the extracted pressure loss value is equal to or less than the target pressure loss value and the noise reduction amount is equal to or more than the target noise reduction amount during this repeated processing (STEP 28), the simulation is terminated. On the other hand, if STEP 28 is not satisfied during the repetitive processing, the flow proceeds to the examination of the performance value of the fan (STEP 31), and it is confirmed that the number of fans to be combined is the smallest (STEP 31: YES), and the simulation is terminated. In this case, since the selection of the fan cannot satisfy both the target noise reduction amount and the target pressure loss value, it means that it is necessary to review the silencing chamber 1 as a whole in relation to the fan to be used. .

  On the other hand, if it is not the smallest fan (STEP 31: NO), it is selected again as a smaller fan (STEP 21), the process returns to STEP 2, and the simulation is executed again.

  FIG. 9 is a flowchart showing the process of step 2b that can be incorporated in place of or in addition to step 2a. The step 2b supports the examination when the pressure loss value is larger than the target pressure loss value when the noise reduction amount satisfies the target noise reduction amount, as in the step 2a. If the minimum pressure loss value is found when the noise reduction amount satisfies the target noise reduction amount, and the pressure loss value satisfies the target pressure loss value, whether or not the fan performance can be further reduced Is considered. On the other hand, if a satisfactory pressure loss value cannot be found, the setting is made so that the performance of the fan is increased so that the examination is performed again.

  In the 2b step, the position of the shielding plate 3 is set for all shielding area ratios at the central position of the blower intake port 1a and the blower discharge port 1b in which the noise reduction amount satisfies the target noise reduction amount in STEP 11 of the first step. The pressure loss value when moving several pitches from the center is extracted from the database (STEP 32). By this processing, the arrangement position I of the shielding plate 3 is moved from the reference position toward either the air inlet 1a side or the air outlet 1b side with the center of the air inlet 1a and the air outlet 1b as the reference position. Confirm that the pressure loss value is smaller when the

  More specifically, in STEP 32, based on the database, on the precondition that the shielding area ratio corresponds to the temporary size of the silencer chamber 1 and the noise reduction amount by the shielding plate 3 is equal to or greater than the target noise reduction amount. For example, pressure loss values are extracted when the arrangement position I is arranged from the center (0) to the air inlet 1a side and the air outlet 1b side, for example, at positions of about 5 pitches, that is, at intervals of 25 cm.

  Based on the extracted pressure loss value, it is determined whether the arrangement position I of the shielding plate 3 is arranged on either the air intake port 1a side or the air discharge port 1b side, so that the pressure loss value can be made smaller. (STEP 33).

  Here, although the example (STEP33: YES) which arrange | positions the shielding board 3 to the ventilation inlet 1a side is demonstrated, when arrange | positioning to the ventilation outlet 1b side, the position which arrange | positions the shielding board 3 moves to an opposite direction. Since other processes and the like are not changed, the same STEP numbers are assigned in FIG.

  When it is determined that the pressure loss value can be further reduced by arranging the shielding plate 3 on the air intake port 1a side (STEP 33: YES), the arrangement position I of the shielding plate 3 is set to the air intake port 1a and the air discharge port 1b. The noise reduction amount and the pressure loss value when moving 1 pitch (5 cm) from the center (0) to the air inlet 1a side (STEP 34) are extracted from the database (STEP 35).

  Thereafter, the installation position I of the shielding plate 3 is further moved by one pitch (STEP 36), and the noise reduction amount and the pressure loss value at that time are extracted from the database (STEP 35). The process is repeated until the amount is not satisfied or until the shielding plate 3 reaches the wall 2a of the silencer chamber 1 (STEP 37). Thereafter, the minimum value of the pressure loss value extracted in this process is selected (STEP 38).

  Next, when the minimum value of the pressure loss value is smaller than the target pressure loss value (STEP 39: YES), the next step is to examine the performance value of the fan and confirm that it is the minimum as a combined fan. (STEP 40: YES) The simulation is terminated. On the other hand, if it is not the smallest fan (STEP 40: NO), a smaller fan is selected again (STEP 41), the process returns to STEP 2, and the simulation is executed again.

  In STEP39, when the pressure loss value is larger than the target pressure loss value (STEP39: NO), it is determined whether or not the shielding area ratio has reached 100% (STEP42). If the pressure loss value has reached (STEP42: YES), it is determined whether or not this is the first examination result (STEP 43). If it is the first examination result (STEP 43: YES), the fan under examination is the largest selectable fan. In order to check whether there is, return to STEP8.

  When the shielding area ratio does not reach 100% (STEP 42: NO), the shielding area ratio is increased by 1 pitch, and the process returns to STEP 33 and the simulation is executed again. If it is determined in STEP 43 that the result is not the first examination result (STEP 42: NO), the previous examination result is output as a simulation result (STEP 44), and the simulation is terminated. When the simulation is completed by this procedure, the fan examined last time is the smallest fan that can satisfy both the target noise reduction amount and the target pressure loss value.

  As described above, in the step 2b, the noise is reduced by moving the shielding plate 3 in the direction in which the pressure loss value decreases with respect to all shielding area ratios in which the noise reduction amount satisfies the target noise reduction amount in the first step. The arrangement position I of the shielding plate 3 where the reduction amount satisfies the target noise reduction amount and the pressure loss value becomes the smallest is examined.

  The combined performance of the fan and the muffler chamber 1 is as follows: the amount of air blown by the fan and the sound generated during air blowing, the width, height and depth of the main body 2, the size of the air inlet 1 a and the air outlet 1 b, and air blown by the shielding plate 3 It depends on many design factors such as the shielding area of the path 1c and the arrangement position I of the shielding plate 3. In addition, since the noise reduction chamber 1 is required to achieve both a noise reduction amount and a pressure loss value while considering the balance with the fan, it is difficult to design an appropriate combination of the fan and the noise reduction chamber 1.

  According to the simulation method of the combined performance of the ventilation fan and the muffler chamber 1 according to the present embodiment, any of the ventilation fan and the ventilation inlet 1a through which the air blown from the fan circulates and the ventilation outlet 1b. The silencing chamber 1 having a shielding plate 3 that projects from a ventilation path 1c that communicates with the ventilation inlet 1a and the ventilation outlet 1b and shields a part of the ventilation path 1c. The simulation method of the combined performance of the above, and the fan data of the blowing amount and the sound generated at the time of blowing with respect to a plurality of selectable fans; the size of the silencer chamber 1 including the size of the blower intake port 1a and the size of the blower discharge port 1b Is a plurality of chamber data set at a predetermined pitch so as to be changeable; the arrangement position I of the shielding plate 3 and the shielding surface of the air flow path 1c at the arrangement position I A plurality of shielding plate related data whose ratios are set to be variable at a predetermined pitch; pressure loss value and noise reduction performance value data associated with a combination of fan data, chamber data and shielding plate related data; And the fan-related data of the shielding plate 3 is referred to the fan data and the chamber data of the fan to be simulated and the silencing chamber 1 and the chamber data. Performance value data is extracted as the combined performance of the system, so the performance data can be easily extracted in a short time with the noise reduction amount and pressure loss value when any of fan data, chamber data and shielding plate related data is changed. Therefore, it is possible to support the examination of preferable ventilation equipment. Specifically, by setting the ventilation fan to be simulated, the size of the silencer chamber 1, the arrangement position I of the shielding plate 3, and the shielding area ratio from the computer input means or extracting them from the database, a desired shape can be obtained. The combination performance of the muffler chamber 1 and the fan combined therewith can be easily confirmed. Therefore, according to the simulation method of the combined performance of the ventilation fan and the silencing chamber according to the present embodiment, the ventilation fan and the ventilation fan can be designed so that a ventilation facility that can satisfy both the noise reduction amount and the pressure loss value can be designed. The examination of the combination with the silencing chamber 1 can be supported.

  Of the pressure loss value and the noise reduction amount extracted from the performance value data based on the fan data and the chamber data of the fan and the silencing chamber 1 to be simulated, the pressure loss value is smaller than the target pressure loss value, and the noise reduction amount Is smaller than the target noise reduction amount, in the first step, the shielding plate 3 is subsequently arranged at the center between the air inlet 1a and the air outlet 1b of the silencer chamber 1 based on the data relating to the shielding plate. The pressure loss value and the noise reduction amount when the shielding area ratio is changed at a predetermined pitch are extracted from the performance value data, and then any of the plurality of noise reduction amounts extracted in the first step is more than the target noise reduction amount. If it is larger, then in step 2a, the shielding plate-related data is calculated for the minimum shielding area ratio at which the noise reduction amount extracted in the first step satisfies the target noise reduction amount. Based on the data, the pressure loss value when the position I of the shielding plate 3 is changed at a predetermined pitch is extracted from the performance value data, so it is confirmed that the noise reduction amount is larger than the target noise reduction amount in the first step In addition, in step 2a, the shielding plate 3 is moved in the direction in which the noise reduction amount increases, and the arrangement position I of the shielding plate 3 where the pressure loss value becomes the smallest is examined. It is possible to rationally examine the correlation between the noise reduction value and the design of ventilation equipment with appropriate combined performance.

  Of the pressure loss value and the noise reduction amount extracted from the performance value data based on the fan data and the chamber data of the fan and the silencing chamber 1 to be simulated, the pressure loss value is smaller than the target pressure loss value, and the noise reduction amount Is smaller than the target noise reduction amount, in the first step, the shielding plate 3 is subsequently arranged at the center between the air inlet 1a and the air outlet 1b of the silencer chamber 1 based on the data relating to the shielding plate. The pressure loss value and the noise reduction amount when the shielding area ratio is changed at a predetermined pitch are extracted from the performance value data, and then any of the plurality of noise reduction amounts extracted in the first step is more than the target noise reduction amount. When it is larger, then in step 2b, all the shielding area ratios in which the noise reduction amount extracted in the first step satisfies the target noise reduction amount are related to the shielding plate. The noise reduction amount and the pressure loss value when the arrangement position I of the shielding plate 3 is changed at a predetermined pitch are extracted from the performance value data based on the data, so that the noise reduction amount is greater than the target noise reduction amount in the first step. In step 2b, the shielding plate 3 is moved in the direction in which the pressure loss value decreases, and the noise reduction amount is larger than the target noise reduction amount and the pressure loss value is the smallest. The arrangement position I of the plate 3 is examined, and the correlation between the pressure loss value and the noise reduction value can be rationally examined to support the design of a ventilation facility having an appropriate combination performance.

  Of the plurality of pressure loss values extracted in step 2a or step 2b, simulation is performed by selecting another ventilation fan with a small air flow rate for the minimum pressure loss value smaller than the target pressure loss value. Since the processing is performed and the fan for ventilation with the minimum air flow is extracted and the simulation process is terminated, it is possible to support the examination of the application of a fan with low performance as a ventilation facility.

  When the plurality of pressure loss values extracted in step 2a or step 2b are all larger than the target pressure loss value, the simulation process is performed by selecting another ventilation fan with a large air flow rate. Therefore, examination of ventilation equipment can be supported from the aspect of fan selection without changing the size of the silencing chamber 1.

  If the noise reduction amount extracted in the first step is smaller than the target noise reduction amount, then the maximum shielding area where the pressure loss value extracted in the first step satisfies the target pressure loss value in the third step. Regarding the ratio, since the noise reduction amount is extracted from the performance value data when the arrangement position I of the shielding plate 3 is changed at a predetermined pitch based on the shielding plate related data, the pressure loss value is set to the target pressure loss by the third step. In the state where the value is satisfied, the shielding plate 3 can be moved in the direction in which the noise reduction amount increases, and it can be examined whether or not the target noise reduction amount is satisfied, and the correlation between the pressure loss value and the noise reduction value is obtained. Reasonable consideration can be given to support the design of ventilation equipment with appropriate combined performance.

  When any of the plurality of noise reduction amounts extracted in the third step is larger than the target noise reduction amount, the simulation process is terminated, and all of the plurality of noise reduction amounts extracted in the third step are the target noise reduction amount. If it is smaller than the above, since the simulation process is performed by selecting another ventilation fan with a small air flow rate, the size of the muffler chamber 1 is not changed, and the ventilation equipment can be selected from the aspect of fan selection. Can support the examination.

  Since the storage unit of the computer is provided with the sound absorbing material database in which the type of the sound absorbing material 4 is associated with the sound absorption rate, the noise reduction effect by the sound absorbing material 4 provided on the inner surface of the silencer chamber 1 can also be simulated. Thereby, the performance of the different sound-absorbing materials 4 can be compared.

  When simulating the arrangement position I of the shielding plate 3, the arrangement position I of the shielding plate 3 is selected from the center of the air inlet 1 a and the air outlet 1 b among the air inlet 1 a and the air outlet 1 b. Which side should be set to achieve better performance is simulated with a rough pitch, and after determining the direction, the simulation is performed with a fine pitch. I can be obtained.

  Steps 2a and 2b may be executed by selecting either step from the relationship between the noise reduction amount extracted in the first step and the pressure loss value, or using these steps in combination. The 2b step may be executed after the 2a step, or the 2a step may be executed after the 2b step.

  In the above embodiment, regarding the size of the muffler chamber 1, the size in the height direction of the air inlet 1a and the air outlet 1b, and the arrangement position I of the shielding plate 3, the pitch is 5 cm, and the pitch of the shielding area ratio is set. However, the present invention is not limited to this, and each size may have a different pitch. Although the example in which the shielding plate 3 is erected on the lower surface of the main body 2 has been described, the present invention is not limited thereto, and the shielding plate 3 may be suspended from the upper surface, for example.

DESCRIPTION OF SYMBOLS 1 Silence chamber 1a Air inlet 1b Air outlet 1c Air path 2 Body part 3 Shielding board I Arrangement position Sa Cross-sectional area of air path Sb Area to shield

Claims (8)

Provided in a ventilation path that communicates the ventilation inlet and the ventilation outlet at any position between the ventilation fan and the ventilation inlet and the ventilation outlet through which the ventilation from the fan circulates. And a simulation method of the combined performance with the silencing chamber having a shielding plate that shields a part of the ventilation path,
A plurality of selectable fans, fan data of a blowing amount and sound generated at the time of blowing; a plurality of sizes of the muffler chamber including a size of the blowing inlet and a size of the blowing outlet are changeable at a predetermined pitch Chamber data set; shielding plate-related data in which a plurality of shielding plate placement positions and shielding area ratios of the air blowing paths at the placement positions are set at a predetermined pitch; the fan data and the chamber data And a pressure loss value associated with the combination of the shielding plate related data and a performance value data of noise reduction amount;
With respect to the fan data and the chamber data of the fan and the silencing chamber to be simulated, the shielding plate related data of the shielding plate is referred to, and the performance value data as the combined performance of these fans and the silencing chamber A method for simulating the combined performance of a ventilation fan and a silencing chamber, wherein Of the pressure loss value and noise reduction amount extracted from the performance value data based on the fan data and the chamber data of the fan and the silencing chamber to be simulated, the pressure loss value is smaller than the target pressure loss value. When the noise reduction amount is smaller than the target noise reduction amount, in the first step, based on the shielding plate related data, the shielding plate is placed between the ventilation inlet and the ventilation outlet of the silencing chamber. The pressure loss value and the noise reduction amount when the shielding area ratio is changed at a predetermined pitch by arranging in the center are extracted from the performance value data,
Next, when any of the plurality of noise reduction amounts extracted in the first step is larger than the target noise reduction amount, the noise reduction amount extracted in the first step is then reduced to the target noise reduction in step 2a. The pressure loss value when the arrangement position of the shielding plate is changed at a predetermined pitch is extracted from the performance value data based on the shielding plate related data for the minimum shielding area ratio satisfying the amount. Item 8. A simulation method of the combined performance of the ventilation fan and the silencing chamber according to Item 1. Of the pressure loss value and noise reduction amount extracted from the performance value data based on the fan data and the chamber data of the fan and the silencing chamber to be simulated, the pressure loss value is smaller than the target pressure loss value. When the noise reduction amount is smaller than the target noise reduction amount, in the first step, based on the shielding plate related data, the shielding plate is placed between the ventilation inlet and the ventilation outlet of the silencing chamber. The pressure loss value and the noise reduction amount when the shielding area ratio is changed at a predetermined pitch by arranging in the center are extracted from the performance value data,
Next, when any of the plurality of noise reduction amounts extracted in the first step is larger than the target noise reduction amount, the noise reduction amount extracted in the first step is then reduced to the target noise reduction in the second step b. For all shielding area ratios satisfying the amount, the noise reduction amount and the pressure loss value when the arrangement position of the shielding plate is changed at a predetermined pitch are extracted from the performance value data based on the shielding plate related data. The method for simulating the combined performance of a ventilation fan and a silencing chamber according to claim 1.   Of the plurality of pressure loss values extracted in the step 2a or step 2b, the minimum pressure loss value smaller than the target pressure loss value is selected again as another ventilation fan with a small air flow rate. The simulation process is performed, the ventilation fan with the minimum air flow is extracted, and the simulation process is terminated. The combination of the ventilation fan and the silencing chamber according to claim 2 or 3, Simulation method.   When the plurality of pressure loss values extracted in the step 2a or the step 2b are all larger than the target pressure loss value, the simulation process is performed by selecting another ventilation fan having a large air flow rate. The simulation method of the combined performance of the fan for ventilation and the silencing chamber according to any one of claims 2 to 4, wherein the performance is combined.   If the noise reduction amount extracted in the first step is smaller than the target noise reduction amount, then, in the third step, the pressure loss value extracted in the first step satisfies the target pressure loss value. The noise reduction amount when the arrangement position of the shielding plate is changed at a predetermined pitch based on the shielding plate related data is extracted from the performance value data with respect to the shielding area ratio. A method for simulating the combined performance of the ventilation fan and the silencing chamber according to any one of the items.   When any of the plurality of noise reduction amounts extracted in the third step is larger than the target noise reduction amount, the simulation process is terminated, and all of the plurality of noise reduction amounts extracted in the third step are the target noise. 7. The combination of a ventilation fan and a silencing chamber according to claim 6, wherein when the amount is smaller than the reduction amount, the simulation process is performed by selecting another ventilation fan with a small air flow rate. Performance simulation method.   The simulation method for the combined performance of the ventilation fan and the silencing chamber according to any one of claims 3 to 7, wherein the second step (a) and the second step (b) are sequentially performed.

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