Duct panel

Abstract

To suppress an induction air current generated in the vicinity of a side wall in a turbulent flow type clean room, etc.SOLUTION: A duct panel 100 is erected in a dust removal target room B to which air is supplied from a top wall F, and is used for returning air sucked from the lower side to the top wall side. The duct panel 100 includes: a main suction port 2 that forms a hollow flat rectangular parallelepiped and is provided on a lower part of a surface wall 1 on an indoor side; an air blowing port 31 provided in an upper part of the surface wall 1 to return the air sucked from the main suction port 2 to the top wall F side; and an upper suction port 4 provided on the lower side of the air blowing port 3 and on the upper side of the main suction port 2 on the surface wall 1.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This invention relates to a duct panel that is installed upright in a room that requires dust removal, such as a clean room, sterile room, or operating room, and that returns air from near the floor to the ceiling, and in particular to a duct panel that is installed in a turbulent type room that requires dust removal, in which air is supplied downward from the ceiling and then sucked in from the side walls or the bottom of the partitions. [Background technology]

[0002] In rooms that require dust removal, such as clean rooms, particularly when it is not possible to provide a suction port on the floor to draw in indoor air, a so-called turbulent air purifying device is used in which a suction port is provided on a side wall of the room, the air drawn in from the suction port is sent through a duct to the space inside a double ceiling, and then the air is returned to the room while removing dust and other particles using a fan filter unit or the like provided on the ceiling wall (see, for example, Patent Document 1 and Patent Document 2).

[0003] In such turbulent clean rooms, etc., air flows occur near the walls in a direction different from the air flow from the fan filter unit on the ceiling wall to the suction port at the bottom of the side wall, etc., which is known as an induction phenomenon, and this causes dust to accumulate near the walls, which becomes a problem.

[0004] For example, Patent Document 1 discloses an induced contamination prevention device that prevents induced air currents from entering from below a hood hanging down around the clean booth and rising along the hood in a clean booth installed in a clean room by sucking in air from inside the booth through a suction port installed near the bottom end of the hood.

[0005] Furthermore, Patent Document 2 discloses an example of a conventional clean room in which a main air outlet is provided on the ceiling wall and air is drawn in through main air inlets provided at the bottom of the side walls and in the center of the floor, in which an auxiliary air inlet is provided on the ceiling to draw in air from an air stagnation area outside the area controlled by the main airflow blown out from the main air outlet. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 61-27435 [Patent Document 2] Japanese Patent Application Laid-Open No. 63-105346 Summary of the Invention [Problem to be solved by the invention]

[0007] However, whether air is sucked in near the bottom end of the hood as in Patent Document 1 or from the ceiling as in Patent Document 2, an induced airflow caused by the air drawn into these suction ports is generated near the side walls, which creates the problem of not being able to adequately remove dust that has accumulated near the side walls. The present invention has been made in view of the above-mentioned problems, and aims to provide a duct panel that can effectively suppress induced airflows that occur on side walls, etc., of a room that is to be dust-removed, such as a clean room. [Means for solving the problem]

[0008] The invention made to solve the above problems is a hollow, flat, rectangular duct panel that is erected in a room to be dust-removed, where air is supplied from the ceiling wall, and returns air sucked in from below to the ceiling wall side, and is characterized by having a main suction port provided in the lower part of the front wall on the room side, or in the bottom wall, an air supply port provided in the upper wall or in the upper part of the front wall, and returning air sucked in from the main suction port to the ceiling wall side, and an upper suction port provided in the front wall below the air supply port and above the main suction port.

[0009] The duct panel of the present invention has an upper suction port on the front wall located below the air supply port and above the main suction port, so that it can suck in induced airflow generated near the front wall and suppress the accumulation of dust caused by the induced airflow.

[0010] The upper suction port preferably includes a guide plate that is inclined to guide the sucked air upward. This allows an airflow to be formed that flows into the upper suction port along the surface of the duct panel, more effectively preventing dust from accumulating due to induced airflow generated near the surface of the duct panel, and also prevents the airflow sucked in from the upper suction port and the airflow rising from the main suction port from interfering with each other inside the duct panel.

[0011] The guide plate is preferably provided adjacent to the lower side of the upper suction port on the inside of the upper suction port. In this way, the guide plate can block the airflow rising along the front wall of the duct panel while guiding it to the rear inside the duct panel, thereby more effectively suppressing the buffering of the airflow rising inside the duct panel and the airflow from the upper suction port without impeding the rise of the airflow rising inside the duct panel from the main suction port.

[0012] The duct panel of the present invention preferably includes an eave plate provided on the front wall adjacent to the upper side of the upper suction port in an eave-like shape, which allows the negative pressure from the upper suction port to be concentrated below the upper suction port, thereby more effectively forming an upward airflow at the upper suction port.

[0013] It is preferable that the main suction port draws air upward, which prevents interference between the negative pressure from the main suction port and the negative pressure from the upper suction port, thereby more effectively suppressing induced airflow on the duct panel surface.

[0014] The duct panel of the present invention preferably includes a shielding plate that hangs down from above parallel to the front wall so as to cover the space above the eaves plate. This prevents air that has entered above the eaves plate from accumulating and prevents dust from accumulating in the space along with the accumulating air. [Effects of the Invention]

[0015] As described above, the duct panel according to the present invention can effectively suppress the induced airflow generated on the side wall of the room to be dust-removed. [Brief explanation of the drawings]

[0016] [Figure 1] 1A and 1B are a front view and a plan view showing a duct panel according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along line XX in FIG. [Figure 3] FIG. 2 is an enlarged cross-sectional view of the vicinity of an upper suction port in FIG. [Figure 4] FIG. 2 is an enlarged cross-sectional view of the vicinity of the main suction port of FIG. 1. [Figure 5] 2 is a front view of a main part showing the periphery of the shielding plate of FIG. 1. FIG. [Figure 6] FIG. 10 is a front view of a main part showing the periphery of an upper suction port in a duct panel according to a second embodiment of the present invention. [Figure 7] 7 is an enlarged side cross-sectional view of the upper suction port shown in FIG. 6. [Figure 8] FIG. 10 is a perspective view of a main part showing the periphery of an air supply port in a duct panel according to a third embodiment of the present invention. [Figure 9] FIG. 9 is a side view of a main part of the duct panel shown in FIG. 8. [Figure 10] 10A and 10B are a longitudinal cross-sectional view and a front view, respectively, showing the periphery of an upper suction port in a duct panel according to a fourth embodiment of the present invention. [Figure 11] 10A and 10B are a longitudinal cross-sectional view and a front view showing the periphery of an upper suction port in a duct panel according to a fifth embodiment of the present invention. [Figure 12] FIG. 10 is a front view showing the periphery of an upper suction port in a duct panel according to a sixth embodiment of the present invention. [Figure 13] FIG. 10 is a schematic view showing a state in which a duct panel according to a seventh embodiment of the present invention is installed in a dust removal target room B. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, however, the present invention is not limited to the following embodiments.

[0018] (First embodiment) 1 and 2 show a duct panel 100 according to a first embodiment of the present invention. As shown in Fig. 2, the duct panel 100 is installed in a room B to be dust-removed, such as a clean room, operating room, or sterile room, where air is supplied from an attic space A and taken in from the bottom of a side wall or partition, a so-called turbulent method of dust removal. The duct panel 100 is attached to a side wall C or erected as a partition at a position separated from the side wall C, and is used to return air drawn in from near the floor G to the attic space A.

[0019] The duct panel 100 is formed into a hollow, flat rectangular parallelepiped shape by sheet metal processing of a metal plate such as a painted steel plate or a stainless steel plate, and as shown in Figures 1 and 2, it mainly comprises a main suction port 2 provided at the bottom of the front wall 1, an air supply port 31 provided in the upper wall 3 that returns air sucked through the main suction port 2 to the attic space A, and an upper suction port 4 provided above the main suction port 2 on the front wall 1, as well as a shielding plate 5 hanging down from the ceiling wall F. However, the air supply port 31 may be provided near the upper end of the front wall 1, in which case the upper suction port 4 is provided below the air supply port 31 and above the main suction port 2.

[0020] As shown in FIG. 4, the main suction port 2 includes a rectangular opening 21 drilled in the front wall 1, a cover member 22 that closes the opening 21 and has multiple slits 22a, a pre-filter 23 that is provided inside the cover member 22, and multiple inclined plates 24, 25 (see FIG. 2 for the inclined plate 25) that are horizontally and parallelly arranged inside the pre-filter 23. The inclined plates 24, 25 are inclined upward from the front side (right side in FIG. 4) of the duct panel 100 toward the back side (left side in FIG. 4). The lowest inclined plate 25 extends further rearward than the other inclined plates 24, etc. The main suction port 2 may be provided with only the lowest inclined plate 25, and the other inclined plates 24, etc. may be omitted. However, the inclined plate 25 may be the same length as the other inclined plates 24.

[0021] 1(b), the air supply ports 31 are circular through-holes drilled in the upper wall 3 of the duct panel 100, and a pair of them are provided symmetrically on the left and right. The air supply ports 31 are connected to the fan filter unit E by a duct D made of a circular pipe.

[0022] As shown in Fig. 1, the upper suction port 4 is a rectangular through-hole extending horizontally that is drilled near the upper end of the front wall 1. As shown in Figs. 1 and 3, the upper suction port 4 is equipped with an eave-shaped eaves plate 41 that is provided along the upper edge so as to protrude outward from the front wall 1, and a guide plate 42 that is provided along the lower edge so as to extend to the back side of the front wall 1 and is inclined upward toward the back side.

[0023] The upper suction port 4 is provided at a height in the duct panel 100 between the main suction port 2 and the air supply port 31, or between the main suction port 2 and the ceiling wall F. This makes it possible to effectively suppress induced airflow that occurs above the main suction port 2 and near the front wall 1. Furthermore, the upper suction port 4 is preferably provided at a position higher than half the total height of the duct panel 100. In this way, the upper suction port 4 is provided at a height that is far from the main suction port 2 and where induced airflow is likely to occur, making it possible to more effectively suppress induced airflow that occurs near the front wall 1.

[0024] The shielding plate 5 is made of a metal or resin plate, and as shown in Figures 2 and 5, its upper end is fixed to the ceiling wall F and hangs down from the ceiling wall F so as to shield the space B1 between the ceiling wall F and the eaves plate 41. This prevents dust from accumulating above the eaves plate 41. In the example shown, the shielding plate 5 has approximately the same horizontal length as the eaves plate 41, but it may be longer than the eaves plate 41. When multiple duct panels 100 are lined up along the wall surface of the room B to be dust-removed, the shielding plate 5 may be provided so as to span all of the multiple duct panels 100, for example, to have a length spanning the entire width of the side wall.

[0025] Next, the operation and effect of the duct panel 100 of this embodiment will be described. When the air conditioning equipment in the target room B is operated, the fan E1 of the fan filter unit E is driven to suck in air from the duct D and supply it as a downward airflow into the target room B via the HEPA filter E2, as shown in Figure 2. After the air supplied into the room reaches the vicinity of the floor G, it moves along the floor G toward the side wall due to the negative pressure from the main suction port 2 of the duct panel 100, and is then sucked into the duct panel 100 through the main suction port 2.

[0026] The main suction port 2 draws in air from below the main suction port 2 along multiple inclined plates 24 that slope inward and upward toward the back, thereby preventing obstruction of the airflow drawn into the upper suction port 4 along the front wall 1. The inclined plates 24 also create a smooth upward airflow within the duct panel 100, which encourages the air to be drawn upward from the upper suction port 4.

[0027] As shown in Figure 2, air sucked in through the main suction port 2 is sucked upward by negative pressure supplied by fan E1 through duct D, and rises through the internal space of the duct panel 100 toward the air supply port 31. Here, because a guide plate 42 protrudes from the inside of the upper suction port 4, the air rising from the main suction port 2 and the air flowing in from the upper suction port 4 do not collide, allowing the air from the main suction port 2 to rise smoothly. Furthermore, the guide plate 42 narrows the cross section of the air sucked in through the main suction port 2, increasing the flow velocity and reducing the pressure. This allows the upper suction port 4 to suck air smoothly along the front wall 1.

[0028] Upper suction port 4 is provided with eaves plate 41 along the upper edge of the front side, so that air drawn into upper suction port 4 is drawn from the vicinity of portion 11 of front wall 1 below upper suction port 4. Air moving toward upper suction port 4 along front wall 1 collides with eaves plate 41 and is guided to upper suction port 4. Upper suction port 4 is further provided with guide plate 42 that slopes higher toward the back, so that air drawn into upper suction port 4 flows diagonally upward into duct panel 100. In this way, the generation of induced airflow near front wall 1 of duct panel 100 can be effectively suppressed.

[0029] The air flowing in from the main suction port 2 and the upper suction port 4 meets at the top of the duct panel 100, and is sent from the air supply port 31 through the duct D to the fan filter unit E where it is cleaned of dust and then supplied to the room B to be cleaned of dust through the ceiling wall F.

[0030] The space B1 between the eaves plate 41 of the duct panel 100 and the top wall F is covered with the shielding plate 5, so that dust can be prevented from accumulating in the space B1 along with the airflow.

[0031] (Second embodiment) 6 and 7 show the periphery of upper suction ports 204 of a duct panel 200 according to a second embodiment of the present invention. The duct panel 200 has three upper suction ports 204 each consisting of a long, narrow slit, and only the uppermost upper suction port 204 is provided with an eave plate 41, and each upper suction port 204 is provided with a guide plate 242. In the second and subsequent embodiments, the same members as those in the first embodiment are denoted by the same reference numerals and the description thereof will be omitted.

[0032] (Third embodiment) 8 and 9 show the periphery of air outlets 331a, 331a of a duct panel 300 according to a third embodiment of the present invention. The duct panel 300 of this embodiment has a duct connector 330 at its upper end. As shown in FIG. 9, the duct connector 330 has a surface 331 that protrudes forward (to the left in FIG. 9) to accommodate a pair of left and right fans (not shown) installed inside (left and right in FIG. 8). The duct connector 330 is connected to a duct D via the air outlets 331a, 331a. The fan, for example, is a sirocco fan that draws air from inside the duct panel 300 and sends it through the air outlets 331a, 331a to the duct D, which is connected to the fan filter unit E. However, it is also possible not to provide a fan inside the duct connector 330.

[0033] (Fourth embodiment) 10 shows the area around upper suction port 404 of duct panel 400 according to the fourth embodiment of the present invention. Upper suction port 404 is located at a height close to the top wall F when duct panel 400 is installed, and since air can be guided to upper suction port 404 by the top wall F, no eaves plate is provided.

[0034] (Fifth embodiment) 11 shows the periphery of upper suction ports 4 of a duct panel 500 according to a fifth embodiment of the present invention. In this embodiment, three upper suction ports 4 are arranged in the height direction of the duct panel 500.

[0035] (Sixth embodiment) 12 shows the periphery of upper suction ports 604, 604 of a duct panel 600 according to a sixth embodiment of the present invention. In this embodiment, the upper suction ports 604 are wider in the vertical direction than the three upper suction ports 4, 4, 4 of the fifth embodiment, and two upper suction ports 604 are arranged vertically. In the duct panel 600, the eaves plate 41 is provided only on the upper upper suction port 604, and not on the lower upper suction port 604. However, if the upper upper suction port 604 is close to the ceiling wall F, the eaves plate 41 may not be provided on the upper upper suction port 604 either.

[0036] (Seventh embodiment) 13 shows an example in which a duct panel 700 according to the seventh embodiment of the present invention is installed in a sterile room in which a bed, an OAV, etc. are installed. The duct panel 700 is hung from a ceiling wall F or attached to a side wall C, and the bottom wall 9 is spaced from the floor G, and is used when there is an obstacle below, as in the example shown. A main suction port 702 is provided in the bottom wall 9 of the duct panel.

[0037] (Other embodiments) As described above, the present invention is not limited to the above-described embodiments. For example, the upper suction port may be provided with a mesh-like cover with multiple slits, as in the main suction port 2 of the first embodiment, or may be provided with a pre-filter inside. The upper suction port may not be provided with an eave plate or guide plate, and a shielding plate may not be provided above the eave plate. The number of upper suction ports is not limited to one to three, and may be four or more. Furthermore, the main suction port may not only draw air upward, but also draw air downward or horizontally. When the main suction port or upper suction port draws air upward, it may be possible to draw air upward by tilting the main suction port or upper suction port itself toward the user and facing downward, as in the intake surface 29 of the intake unit disclosed by the present applicant in Japanese Patent Application No. 2017-057671, without using a guide plate or inclined plate. [Explanation of symbols]

[0038] 100,200,300,400,500,600,700 duct panel 1. Front wall 2,702 Main suction port 3 Upper wall 31,331a Air supply port 4,204,404,604 Upper suction port 41 Eave plate 42 Signboard 5 Shielding plate B. Dust removal room C side wall

Claims

1. A hollow, flat, rectangular duct panel that is erected in a dust removal target room where air is supplied from the ceiling wall and returns air sucked from below to the ceiling wall side, A main suction port provided in the lower part of the front wall or the bottom wall on the indoor side; an air supply port provided in an upper portion of the top wall or the front wall, which returns the air sucked from the main suction port to the top wall side; an upper suction port provided in the front wall below the air supply port and above the main suction port; A duct panel comprising:

2. The duct panel according to claim 1 , wherein the upper suction port includes a guide plate that is inclined to guide the sucked air upward.

3. The duct panel according to claim 2 , wherein the guide plate is provided adjacent to a lower side of the upper suction port on the inner side of the upper suction port.

4. The duct panel according to claim 1 or 2, further comprising an eave plate provided in an eave shape on the front wall adjacent to an upper side of the upper suction port.

5. 3. The duct panel according to claim 1, wherein the main suction port draws air upward.

6. The duct panel according to claim 4, further comprising a shielding plate that hangs down from above parallel to the front wall so as to cover a space above the eave plate.

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