JP2011106757A - Airflow rectifying device and airflow rectifying system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airflow rectifying device which allows thinning and reduction in weight and cost and which can sufficiently rectify an air flow. <P>SOLUTION: The airflow rectifying device 20 has a plurality of ventilation penetration holes and includes three porous plates 31-33 arranged in a flow passage of the airflow in an attitude nearly orthogonal to the airflow. The airflow is rectified by serially passing through the three porous plates 31-33. The porous plates 31-33 are arranged in parallel to be spaced from each other. The porous plate 33 arranged at the most downstream position is constituted of a mesh screen, and the porous plates 31, 32 arranged at other positions are constituted of mesh screens or punching plates. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an airflow rectifier that rectifies an airflow and an airflow rectifier system including the airflow rectifier.

  2. Description of the Related Art Conventionally, an airflow rectification system including a blower for generating an airflow and an airflow rectifier that rectifies the airflow generated by the blower is known.

  Such an airflow rectification system can supply a rectified airflow, and is applied to a push-pull device, an air curtain device, a clean room, a clean booth, and the like.

  For example, in Patent Document 1, a plurality of perforated plates are arranged in parallel and spaced apart from each other in a posture that is perpendicular to the airflow, and the airflow is allowed to pass through the ventilation holes of the perforated plates. There is disclosed a uniform air flow blowing device adapted to rectify.

  Specifically, the porous plate in Patent Document 1 is a honeycomb core and a punching plate.

  In general, a honeycomb core refers to a structure in which regular hexagonal columnar ventilation through holes are arranged adjacent to each other with almost no gap. The feature of such a honeycomb core is that it is difficult to improve the straightness of the airflow while improving the uniformity of the airflow.

  Further, in general, a punching plate is a plate formed by forming a plurality of ventilation through holes in a plate material continuous over the entire surface by pressing. A feature of such a punching plate is that a relatively large resistance can be applied to the airflow, and the uniformity of the airflow is easily improved by this resistance.

  By the way, the honeycomb core has various disadvantages such as being thick and bulky, becoming heavy due to reinforcement for supplementing low strength, and being expensive.

  Therefore, the inventor of the present application considered that the apparatus is configured only by the punching plate, thereby realizing reduction in thickness, weight and cost of the apparatus.

JP 2001-289500 A

  However, although the above-described configuration of only the punching plate can solve the above-described disadvantages, the punching plate has a new problem that it is difficult to improve airflow rectification because it is difficult to obtain straightness of the airflow compared to the honeycomb core. Was found to occur.

  The present invention has been made to solve the above-described problems, and provides an airflow rectifier and an airflow rectification system capable of reducing the thickness, weight, cost, and sufficiently rectifying an airflow. With the goal.

  In order to achieve the above object, an airflow rectifier according to claim 1 of the present invention has a plurality of through holes for ventilation, and is disposed in a flow path of the airflow in a posture substantially orthogonal to the airflow. A plurality of perforated plates, and an airflow rectifier configured to rectify the airflow by sequentially passing the plurality of perforated plates, wherein the plurality of perforated plates are spaced apart from each other. The porous plates are arranged in parallel, and the perforated plate disposed at the most downstream position is formed of a mesh screen, and the perforated plates disposed at other positions are formed of a mesh screen or a punching plate.

  An airflow rectifier according to a second aspect is the airflow rectifier according to the first aspect, wherein three of the perforated plates are spaced apart from each other.

  The airflow rectifier according to claim 3 is the airflow rectifier according to claim 2, wherein all three perforated plates are made of mesh screens.

  The airflow rectifier according to claim 4 is the airflow rectifier according to claim 3, wherein the number of through holes for ventilation per predetermined length of the mesh screen arranged at the intermediate position is arranged at both side positions. The number of through holes for ventilation per said predetermined length of each mesh screen is smaller.

  The airflow rectifier according to claim 5 is the airflow rectifier according to claim 2, wherein the perforated plate arranged at the most upstream position is a punching plate.

  Moreover, the airflow rectification system according to claim 6 of the present invention is provided in a blower for generating an airflow and a flow path of the airflow generated by the blower, and rectifies the airflow by passing the airflow. The airflow rectifier according to any one of claims 1 to 5 is provided.

  According to the airflow rectifying device of the present invention, the device can be reduced in thickness, weight and cost, and the airflow can be sufficiently rectified.

  Moreover, according to the airflow rectification system of the present invention, a sufficiently rectified airflow can be generated.

It is sectional drawing which showed the whole structure of the airflow rectification system by embodiment of this invention. It is a disassembled perspective view of the airflow rectifier of FIG. (A) is sectional drawing for demonstrating the rectification effect | action by a mesh screen, (b) is sectional drawing for demonstrating the rectification effect | action by a punching board. 4 is a chart showing rectification characteristics of the airflow rectifier according to Example 1. 5 is a chart showing rectification characteristics of an airflow rectifier according to Example 2. 10 is a chart showing rectification characteristics of an airflow rectifier according to Example 3. It is the graph which showed the rectification characteristic of the airflow rectifier by a comparative example. It is the schematic which showed the structure of the push pull apparatus to which the airflow rectification system of embodiment is applied. It is the schematic which showed the structure of the clean room to which the airflow rectification system of embodiment is applied.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, a basic configuration of the airflow rectification system 1 of the present embodiment will be described.

  The airflow rectification system 1 is configured to be able to supply a rectified airflow.

  The “rectified airflow” is defined as an airflow in which the maximum value and the minimum value of the wind speed are within a range of ± 20% with respect to the average value of the wind speed at a plurality of points on a plane orthogonal to the airflow. In some cases, in the present embodiment, the airflow rectification (uniformity and straightness) is simply improved as compared to a conventional airflow rectifier (refer to the airflow rectifier of a comparative example described later). The airflow is called “rectified airflow”.

  As shown in FIG. 1, the airflow rectification system 1 includes an airflow generation device 10 having a blower 11 for generating an airflow, and an airflow rectification device provided on the downstream side of the flow path of the airflow with respect to the airflow generation device 10. 20.

  Examples of the blower 11 include a turbo fan, an axial fan, a fan without a FFU (fan filter unit) filter, and a sirocco fan.

  The airflow rectifier 20 is disposed at three positions between the three porous plates 31 to 33 disposed in the flow path of the airflow, that is, the first porous plate 31 disposed at the most upstream position of the flow path. A second porous plate 32 and a third porous plate 33 arranged at the most downstream position of the flow path.

  The three perforated plates 31 to 33 are provided in parallel with each other in a posture that spreads along a plane substantially perpendicular to the air flow, and at a predetermined interval in the arrangement direction of the perforated plates 31 to 33. It has been. Since the gap between the perforated plates contributes to the thickness of the airflow rectifying device 10, it is preferable that the interval is as small as possible from the viewpoint of reducing the thickness of the device. However, on the other hand, if the interval is too narrow, it becomes difficult for air to move laterally (in the direction in which the porous plate spreads) through the space between the porous plates, and as a result, the uniformity of the airflow is reduced. . Accordingly, the interval between the perforated plates is preferably set to about 25 mm to 125 mm, for example.

  Each of the perforated plates 31 to 33 has a plurality of ventilation through holes 31a to 33a, respectively. The plurality of through holes 31a (32a, 33a) for ventilation are provided so as to be arranged at a predetermined pitch over the entire surface of the porous plate 31 (32, 33), and are formed in the same shape.

  Hereinafter, with reference to FIG. 2, the detailed structure of the said airflow rectifier 20 is demonstrated.

  As shown in FIG. 2, the airflow rectifier 20 includes a rectangular parallelepiped box-shaped casing 21, a frame body 22, an unillustrated presser plate, and the three porous plates 31 to 33 described above.

  An upstream opening 21a is formed on the surface of the casing 21 facing the upstream side (upper surface in FIG. 2), and the downstream opening 21b is formed on the surface of the casing 21 facing the downstream side (lower surface in FIG. 2). Is formed. Further, an insertion opening 21 c for inserting the frame body 22 is provided in a portion near the upstream opening 21 a on the side surface of the casing 21.

  A pair of rails 21d for supporting the frame body 22 inserted from the insertion opening 21c in the casing 21 (only one rail is shown in FIG. Is provided).

  The frame 22 is formed in a U-shaped cross section. An upstream opening 22a is formed on a surface (upper surface in FIG. 2) facing the upstream side of the air flow of the frame body 22, and a downstream surface is formed on a surface (lower surface in FIG. 2) facing the downstream side of the air flow of the frame body 22. A side opening 22b is formed.

  Reinforcing frames 23 to 25 surrounding the perforated plates 31 to 33 are attached to the perforated plates 31 to 33, respectively.

  The first perforated plate 31 is attached to the upper surface of the frame body 22 by fixing the reinforcing frame 23 to the upper surface of the frame body 22 having the upstream opening 22a with screws or the like. The second perforated plate 32 is attached to the lower surface of the frame body 22 by fixing the reinforcing frame 24 to the lower surface having the downstream side opening 22b of the frame body 22 with screws or the like.

  And by inserting the frame 22 into the casing 21 from the insertion opening 21c, the perforated plates 31 and 32 are set in the upper part and the central part of the internal space of the casing 21, respectively. The first perforated plate 31 is exposed to the outside through the upstream opening 21 a of the casing 21.

  The third perforated plate 33 is attached to the lower surface of the casing 21 by fixing the reinforcing frame 25 to the lower surface having the downstream side opening 21b of the casing 21 with screws or the like.

  The presser plate (not shown) is attached to the side surface of the casing 21 so as to close the insertion opening 21c, and is provided to prevent the frame body 22 from falling off the casing 21.

  The reinforcing frames 23 to 25 may be omitted, and the perforated plates 31 to 33 may be attached to the casing 21 or the frame body 22 as a single unit.

  Moreover, it is possible to adjust the space | interval of the perforated plates 31-33 by changing the dimension (the dimension of an up-down direction in FIG. 2) of the thickness direction of the casing 21 or the frame 22. FIG.

  The airflow rectifying device 20 configured in this manner is substantially orthogonal to the airflow in which the perforated plates 31 to 33 are generated by the airflow generating device 10 (hereinafter, the direction in which the airflow flows is referred to as “airflow direction”). By providing it in the downstream of the airflow direction of the airflow generation device 10 in such a posture, the airflow generated by the airflow generation device 10 sequentially passes through the through holes 31a to 33a for ventilation of the three porous plates 31 to 33, This rectifies the airflow.

  Next, the airflow rectifier 20A according to the first embodiment having the above-described airflow rectifier 20 as a basic configuration will be described. That is, in the airflow rectifier 20A of the first embodiment, all three perforated plates 31 to 33 are configured by mesh screens. In the present invention, the perforated plate is defined as a plate-like body having a plurality of ventilation through holes penetrating in the thickness direction, and is used as a general term for a mesh screen, a punching plate, a honeycomb core, and the like.

  As the mesh screen (also referred to as a mesh sheet) here, for example, a steel wire rod is formed by plane weaving with a plain weave or twill weave, or a resin is formed in a mesh shape. What is formed is different from the honeycomb core and punching plate described in the background art above. In such a mesh screen, a standardized numerical value indicating the number of meshes per inch (the number of ventilation through holes) is known, and the fineness of the mesh screen is expressed by this numerical value. For example, 100 mesh means that the number of meshes per inch is 100, and the 100 mesh means that the mesh is finer than 20 mesh. In addition, if the said numerical value differs, generally the diameter of the wire which comprises a mesh screen, an opening, an aperture ratio, a net | network thickness, etc. will differ.

  According to the airflow rectification device 20A of the first embodiment, the device 20A can be reduced in thickness, weight and cost, and the airflow can be sufficiently rectified.

  In other words, in this airflow rectifier 20A, since it is thick and bulky, heavy by reinforcement to compensate for low strength, and does not use a high-cost honeycomb core, compared with the case where a honeycomb core is used, Thinning, light weight, and cost reduction are realized.

  Moreover, since the 3rd perforated plate 33 of the most downstream position is comprised with the mesh screen, compared with the case where the perforated plate of this position is comprised with a punching board, the higher rectification | straightening effect | action can be acquired with respect to an airflow. The superiority of the rectifying action of such a mesh screen is clear from the results of comparative experiments described later, but the inventor of the present application infers the rectifying mechanism as follows.

  That is, as shown in FIG. 3A, in the perforated plate 133 made of a general mesh screen formed by weaving a wire having a substantially circular cross section (so-called round wire), the cross-sectional shape of the ventilation resistance portion 133b is It has a so-called chamfered shape with a corner. Therefore, both the inlet side portion and the outlet side portion of the ventilation through hole 133a of the perforated plate 133 made of such a mesh screen have a substantially weight shape such that the opening area gradually decreases or increases in the airflow direction. ing. For this reason, the vortex flow r1 formed in the position immediately downstream of the ventilation resistance portion 133b when the airflow passes through the ventilation through-hole 133a is relatively small, and the turbulence (turbulence) of the airflow f1 that has passed through the ventilation through-hole 133a. The degree is small. In addition, also in the mesh screen formed by resin molding, the cross-sectional shape of the ventilation resistance portion can be easily set to the chamfered shape only by devising the shape of the molding die.

  On the other hand, as shown in FIG. 3 (b), in the perforated plate 233 made of a general punching plate formed by pressing, the cross-sectional shape of the ventilation resistance portion 233b is a cornered rectangular shape that is not chamfered. It has become. Accordingly, both the inlet side portion and the outlet side portion of the ventilation through-hole 233a of the perforated plate 233 made of such a punching plate are shaped so that the opening area thereof changes abruptly in the airflow direction. For this reason, when the airflow passes through the ventilation through-hole 233a, the eddy current r2 formed at a position immediately downstream of the ventilation resistance portion 233b is relatively large, and the degree of turbulence of the airflow f2 passing through the ventilation through-hole 233a is large.

  As described above, in the perforated plate 133 made of a mesh screen, a rectifying action (particularly, a straight advancement improving action) on the airflow passing through the ventilation through-hole 133a is more exhibited, and the airflow is sufficiently rectified. Thus, in the airflow rectifier 20A of the present embodiment, the airflow is sufficiently rectified by the third porous plate 33 at the most downstream position, so that a sufficiently high rectification action is obtained as a whole.

  Moreover, in the airflow rectifier 20A of the first embodiment, by making the number of perforated plates three, the airflow can be sufficiently rectified and the apparatus can be prevented from being thick and bulky. That is, it is possible to achieve both a sufficient rectifying action against the airflow and a thin device.

  Further, in the air flow straightening device 20A of the first embodiment, the mesh screen is lighter than the punching plate and the honeycomb core by configuring all three perforated plates with a mesh screen, so that the device can be further reduced in weight. Can be achieved. Further, since the mesh screen has a smaller pressure loss than the punching plate, the driving force of the blower 11 for obtaining a predetermined wind speed is small. Thereby, the rectified airflow can be efficiently generated.

  Moreover, according to the airflow rectification system 1 provided with the airflow rectification device 20A of the first form, the airflow from the airflow generation device 10 is sufficiently rectified by the airflow rectification device 20A. Airflow can be supplied.

  Next, an airflow rectifier 20B according to a second embodiment having the airflow rectifier 20 as a basic configuration will be described. That is, the airflow rectifying device 20B of the second embodiment is different from the airflow rectifying device 20A of the first embodiment in that the first perforated plate 31 at the most upstream position is not a mesh screen but a punching plate. It is.

  That is, in the second embodiment, the first perforated plate 31 is configured by a punching plate, and the second perforated plate 32 and the third perforated plate 33 are configured by a mesh screen.

  In the airflow rectifier 20B according to the second embodiment, as described above, the first perforated plate 31 at the most upstream position is configured by a punching plate, so that the airflow passing through the device 20B can be obtained at an initial stage. A large resistance is imparted by the single perforated plate 31, and thereby the uniformity of the airflow can be improved, so that the rectification of the airflow can be further improved finally.

  In addition, the other effects in the airflow rectifier 20B of the second form and the effects in the airflow rectifier system 1 including the airflow rectifier 20B are the same as those described in the first embodiment.

  Next, an airflow rectifier 20C according to a third embodiment having the airflow rectifier 20 as a basic configuration will be described. That is, the second embodiment 20B of the air flow rectifier 20C according to the third embodiment is different from the second embodiment 20B in that the second porous plate 32 at the intermediate position is formed of a punching plate instead of a mesh screen.

  That is, in the 3rd form, the 1st perforated plate 31 and the 2nd perforated plate 32 are comprised by the punching board, and the 3rd perforated plate 33 is comprised by the mesh screen.

  Also in the airflow rectifier 20C of the third embodiment and the airflow rectifier system 1 including the airflow rectifier 20C, the effects described in the first embodiment and the second embodiment are similarly exhibited.

  Next, a comparative experiment performed to prove the rectifying action by the airflow rectifiers 20A to 20C of the first to third embodiments will be described with reference to FIGS.

  That is, the airflow rectifier according to Example 1 corresponding to the first aspect of the present invention, the airflow rectifier according to Example 2 corresponding to the second aspect, and the airflow rectifier according to Example 3 corresponding to the third aspect. The airflow rectifiers according to comparative examples corresponding to the conventional technology were manufactured, and the rectification characteristics of these airflow rectifiers were compared.

  The airflow rectifier of Example 1 is basically the same configuration as the airflow rectifier 20A of the first embodiment described above, and all three perforated plates are configured by mesh screens.

  More specifically, in the airflow rectifier of sample a of Example 1, a 20-mesh mesh screen is used for the first perforated plate at the most upstream position, and a 60-mesh mesh screen is used for the second perforated plate at the intermediate position. The mesh screen of 100 mesh is used for the third perforated plate at the most downstream position.

  In the air flow rectifier of sample b of Example 1, a 60 mesh mesh screen is used for the first porous plate, a 100 mesh mesh screen is used for the second porous plate, and a 100 mesh mesh screen is used for the third porous plate. A mesh screen is used.

  In the airflow rectifier of sample c of Example 1, a 100 mesh mesh screen is used for the first porous plate, a 20 mesh mesh screen is used for the second porous plate, and a 100 mesh mesh screen is used for the third porous plate. A mesh screen is used.

  In the airflow rectifier of sample d of Example 1, a 100 mesh mesh screen is used for the first porous plate, a 60 mesh mesh screen is used for the second porous plate, and a 100 mesh mesh screen is used for the third porous plate. A mesh screen is used.

  In the airflow rectifying apparatus for sample e in Example 1, a 100 mesh mesh screen is used for the first porous plate, an 80 mesh mesh screen is used for the second porous plate, and a 100 mesh mesh screen is used for the third porous plate. A mesh screen is used.

  In the airflow rectifier of sample f of Example 1, a 100 mesh mesh screen is used for the first porous plate, a 100 mesh mesh screen is used for the second porous plate, and a 100 mesh mesh screen is used for the third porous plate. A mesh screen is used.

  Moreover, the airflow rectifier of Example 2 has basically the same configuration as the airflow rectifier 20B of the second embodiment described above, and the first perforated plate at the most upstream position is formed of a punching plate, and an intermediate Each perforated plate at the position and the most downstream position is constituted by a mesh screen.

  More specifically, in the airflow rectifier of the sample g of Example 2, a punching plate is used as the first porous plate at the most upstream position, and a 100 mesh mesh screen is used as the second porous plate at the intermediate position. A 100 mesh mesh screen is used for the third perforated plate at the most downstream position.

  In the airflow rectifier of sample h of Example 2, a punching plate is used for the first porous plate, a 60 mesh mesh screen is used for the second porous plate, and a 100 mesh mesh screen is used for the third porous plate. Used.

  The airflow rectifier of Example 3 has basically the same configuration as the airflow rectifier 20C of the third embodiment described above, and each of the perforated plates at the most upstream position and the intermediate position is formed of a punching plate. The third perforated plate at the most downstream position is constituted by a mesh screen.

  More specifically, in the air flow rectifying device for sample i of Example 3, punched plates are used for the perforated plates at the most upstream position and the intermediate position, and a mesh screen of 100 mesh is used for the third perforated plate at the most downstream position. ing.

  On the other hand, in the air flow rectifier of the sample p of the comparative example, all three perforated plates are configured by punching plates.

  Note that the wire diameter of the 20 mesh screen is 0.5φ, and the aperture ratio is 37%. Further, the wire diameter of the mesh screen of 60 mesh is 0.14φ, and the aperture ratio is 45%. The wire diameter of a 100 mesh mesh screen is 0.1φ, and the aperture ratio is 37%.

  Further, the hole diameter of the through holes for ventilation of the punching plate is 1.5 mm, the arrangement pitch of the through holes for ventilation is 3 mm, and the aperture ratio is 22.8%.

  And by generating the airflow with the wind speed generator of the airflow generation device, with respect to the airflow that has passed through the airflow rectification device, each wind speed at 20 locations on the plane separated by 50 mm downstream from the porous plate at the most downstream position, It measured using the ultrasonic anemometer.

  And from those measurement results, the average wind speed, variation, maximum wind speed, and minimum wind speed of the airflow that passed through the airflow rectifier were determined, and the rectification characteristics of the airflow rectifier were determined.

  In addition, the spacing (pitch) between the perforated plates was changed to 25 mm, 50 mm, 75 mm, and 100 mm with a uniform pitch in this example, and the above measurement was performed for each to obtain the rectification characteristics.

  The rectification characteristics of the airflow rectifier of Example 1 obtained as described above are shown in Table 1 of FIG. 4, the rectification characteristics of the airflow rectifier of Example 2 are shown in Table 2 of FIG. The rectification characteristics of the rectifier are shown in Table 3 of FIG. 6, and the rectification characteristics of the airflow rectifier of the comparative example are shown in Table 4 of FIG.

  Referring to Tables 1 to 4, when comparing the rectifying characteristics in the airflow rectifiers of the samples a to i of Examples 1 to 3 and the rectifying characteristics of the airflow rectifier of the sample p of the comparative example, Examples 1 to 3 was found to be smaller than the variation of the airflow that passed through the airflow rectifier of the comparative example. Thereby, it has confirmed that the effect of the rectification effect | action improvement by having comprised the 3rd perforated plate 33 of the most downstream position in the airflow rectifiers 20A-20C of the 1st-3rd form by the mesh screen was acquired reliably. .

  In particular, referring to Tables 3 and 4, when comparing the rectification characteristics of the airflow rectifier of the sample i of Example 3 with the rectification characteristics of the airflow rectifier of the sample p of the comparative example, the airflow rectifier of Example 3 The variation of the airflow that passed through the airflow rectifier of the comparative example is smaller than the variation of the airflow that passed through the airflow rectifier of the comparative example, and the maximum air velocity (%) of the airflow that passed through the airflow rectifier of Example 3 passed through the airflow rectifier of the comparative example. It is smaller than the maximum wind speed (%) of the airflow, and further, the minimum wind speed (%) of the airflow that has passed through the airflow rectifier of Example 3 is greater than the minimum wind speed (%) of the airflow that has passed through the airflow rectifier of the comparative example. I understood it. That is, it was found that all the rectification characteristics were improved in the airflow rectifier of Example 3. Therefore, the rectifying action of the airflow rectifier can be greatly improved while reducing the thickness, weight and cost of the apparatus by simply replacing the third perforated plate at the most downstream position of the airflow rectifier with the mesh screen from the punching plate. It is guessed that the effect is obtained.

  Moreover, with reference to Table 1, comparatively good rectification characteristics were obtained in the airflow rectifier of sample d among the six samples a to f of Example 1. From this, when the number of meshes per inch of the mesh screen constituting the second perforated plate is smaller than the number of meshes per inch of the mesh screen constituting the perforated plates on both sides, the rectification characteristic is more It is estimated that it will improve.

  Moreover, with reference to Table 1, in the airflow rectifiers of Samples a to f of Example 1, the maximum wind speed and the minimum wind speed were approximately the average wind speed when the distance between the perforated plates was 50 mm, 75 mm, and 100 mm. The airflow passing through the airflow rectifier is within ± 20% and meets the definition of “rectified airflow” described above. In addition, with reference to Tables 2 and 3, in the airflow rectifiers of Samples g to i of Examples 2 and 3, the maximum wind speed was obtained when the interval between the perforated plates was 25 mm, 50 mm, 75 mm, or 100 mm. In addition, the minimum wind speed is within about ± 20% of the average wind speed, and the airflow that has passed through the airflow rectifier is in accordance with the definition of “rectified airflow” described above.

  The airflow rectification system 1 of the above embodiment can be applied to a push-pull device as shown in FIG. That is, the push-pull device shown in FIG. 8 includes a push-side device including the airflow rectifying system 1 according to the above-described embodiment disposed on the left side and a pull-side device 301 disposed on the right side. The pull-side device 301 includes a blower 310 having a suction function and an airflow rectifier 320 including the airflow rectifier of the above embodiment provided on the upstream side of the airflow passage of the blower 310. In this push-pull device, a rectified air current is generated in the space between both devices 1,301. In addition, the air sucked into the blower 310 of the pull side device 301 is sent to the airflow generation device 10 of the push side device through an unillustrated air passage.

  Moreover, the airflow rectification system 1 of the said embodiment is applicable to a clean room as shown in FIG. That is, the clean room shown in FIG. 9 includes the airflow rectification system 1 according to the embodiment that can generate a downward airflow, the space 401 provided below the airflow rectification system 1, and the suction provided at the lower end of the space 401. Fan 410, an air flow path 402 provided so as to surround the airflow rectification system 1 and the space 401, and an FFU (fan filter unit) 420 disposed adjacently above the airflow rectification system 1. In this clean room, a rectified downward airflow is generated in the space 401. Note that the air sucked into the blower 410 is sent to the FFU 420 through the ventilation path 402.

  Unlike the above-described embodiment, the air flow rectifier may be configured such that each of the perforated plates at the most upstream position and the most downstream position is configured by a mesh screen and the perforated plate at the intermediate position is configured by a punching plate. Even in the airflow rectifier of this configuration, the third perforated plate at the most downstream position is configured by a mesh screen, and thus the rectification effect of the above embodiment is achieved.

  Moreover, in the said embodiment, although shown about the airflow rectifier provided with three perforated plates, it is not restricted to this, The airflow rectifier provided with four or more perforated plates may be sufficient. However, if the configuration includes four or more perforated plates, the device becomes too thick and bulky, so the number of perforated plates is three from the standpoint of improving the rectifying action and reducing the thickness. It is preferable.

DESCRIPTION OF SYMBOLS 1 Airflow rectification system 11 Air blower 20, 20A, 20B, 20C Airflow rectifier 31 1st perforated plate 31a Ventilation through-hole 32 2nd perforated plate 32a Ventilation through-hole 33 3rd porous plate 33a Ventilation through-hole

Claims (6)

It has a plurality of through holes for ventilation, and includes a plurality of perforated plates arranged in a flow path of the air current in a posture substantially orthogonal to the air current, and the air flow passes through the plurality of perforated plates in order. An airflow rectifier configured to rectify an airflow,
The plurality of perforated plates are arranged in parallel with an interval between each other,
While the perforated plate arranged at the most downstream position consists of a mesh screen,
An airflow rectifier comprising a perforated plate arranged at another position made of a mesh screen or a punching plate.   The air flow rectifier according to claim 1, wherein three of the perforated plates are arranged at intervals.   The airflow rectifier according to claim 2, wherein all three perforated plates are made of mesh screens.   The number of ventilation through holes per predetermined length of the mesh screen arranged at the intermediate position is smaller than the number of ventilation through holes per predetermined length of each mesh screen arranged at both side positions thereof. The airflow rectifier according to claim 3.   The airflow rectifier according to claim 2, wherein the perforated plate disposed at the most upstream position is a punching plate.   The air flow according to any one of claims 1 to 5, wherein the air flow is provided in a blower for generating an air flow and a flow path of the air flow generated by the blower and rectifies the air flow by passing the air flow. An airflow rectification system comprising a rectifier.

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