Air fan attachment frame

Abstract

To provide an air fan attachment frame which prevents rainwater from entering an indoor space.SOLUTION: An adjustment groove enclosed by a first bank wall and a second bank wall forming a step is provided at a secondary side bottom surface located at the downstream side of a filter frame of a filter housing part. A height of the second bank wall is set to be higher than a height of a water surface retained in the adjustment groove at a final pressure loss of a filter.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a mounting frame that is installed in a through-hole provided in the exterior wall of a building to ventilate the building, and to which a ventilation fan, weather cover, etc. can be attached. [Background technology]

[0002] Patent Document 1 discloses a connection duct that is attached to the interior wall of a building so as to connect an air intake hole provided on the exterior wall of the building to an air intake fan that introduces outside air into the room through the air intake hole in order to ventilate the room. This connection duct is hollow and tubular, with an air passage having an intake opening at one end and an exhaust opening at the other end, and a filter installed in the air passage (hereinafter, for convenience, the upstream side of the filter will be referred to as the "primary side" and the downstream side as the "secondary side").

[0003] The bottom of the ventilation duct is inclined downward toward the intake opening, and rainwater that falls onto the bottom of the duct body is naturally drained outdoors along the slope that descends toward the intake opening.

[0004] However, if the filter becomes dirty and pressure loss increases, the pressure difference (pressure loss) between the primary and secondary sides will increase while the ventilation fan is running, creating a negative pressure inside the ventilation duct between the secondary filter and the ventilation fan, and hydraulic head pressure will act.As a result, rainwater that falls on the bottom of the ventilation duct (duct body) will not be able to flow outdoors along the slope, and a certain amount will remain at the bottom of the ventilation duct, creating a puddle.

[0005] When this happens, the air pressure from the ventilation fan causes the puddle at the bottom of the secondary ventilation duct to ripple, turning into droplets that splash toward the exhaust opening, allowing rainwater to seep into the room via the ventilation fan.

[0006] Therefore, Patent Document 2 discloses a ventilation device in which a ventilation fan unit consisting of a ventilation fan and a filter unit is installed to cover the opening at the indoor end of the mounting frame, and a drain pan is located below the opening and outside the mounting frame, and collects water droplets that fall from the ventilation fan, filter unit, and the boundary between the ventilation fan and filter unit.

[0007] In the mounting frame disclosed in Patent Document 2, the ventilation fan unit, which is composed of a filter unit and a ventilation fan, is installed at the upper opening on the indoor side of the mounting frame, so the entire area within the mounting frame is on the primary side and is not affected by pressure loss from the filter unit. In addition, the drain pan is located outside the mounting frame, so it is not affected by pressure loss from the filter.

[0008] Therefore, when the rainwater collected in the drain pan is drained into the mounting frame via the drain pipe and the through-hole at the bottom of the indoor end plate, it easily flows from the inclined surface of the mounting frame to the outdoors without being affected by the water head pressure from the ventilation fan.

[0009] However, the ventilation device in Patent Document 2 has a ventilation fan installed immediately downstream of the filter unit. The rainwater retained in the filter unit is affected by the air pressure of the ventilation fan, and not all of the rainwater can drain into the drain pan. As a result, the rainwater that cannot drain passes through the ventilation fan and seeps into the indoor side.

[0010] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-242074 [Patent Document 2] Japanese Patent Publication No. 2021-119321 Summary of the Invention [Problem to be solved by the invention]

[0011] SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a ventilation fan mounting frame that prevents rainwater from entering a room. [Means for solving the problem]

[0012] The ventilation fan mounting frame according to the present invention is a cylindrical ventilation passage having an outdoor opening that opens to the outdoor side of an exterior wall and an indoor opening that opens to the indoor side, the ventilation fan mounting frame has functional sections of an exterior wall installation section, a filter accommodating section, and a ventilation fan unit installation section, the filter accommodating section and the ventilation fan unit installation section are arranged so as to be on the indoor side of the building, the exterior wall installation section is installed in a through hole in the exterior wall so that the outdoor opening is located on the outdoor side of the exterior wall, the filter accommodating section is provided with an opening / closing door so that the filter can be detachably accommodated from either the left or right side, and a filter frame that supports the filter is provided inside the filter accommodating section, a ventilation fan unit consisting of a shutter and a ventilation fan is fixed to the ventilation fan unit installation section, the filter frame divides its upstream side into a primary side and its downstream side into a secondary side, and a filter frame is attached to the bottom of the secondary side of the filter accommodating section The filter frame is provided on the first bottom side, and the bottom surface of the lower frame of the filter frame is installed at a position higher than the first bottom side. A first embankment wall is provided on the downstream side of the lower frame. The first embankment wall has a height from the first bottom side to the height of the lower frame and is installed across the entire width of the left and right width of the ventilation fan mounting frame. An adjustment groove surrounded by the first embankment wall and the second embankment wall that forms the step is provided on the secondary side bottom surface, and the height of the second embankment wall is set so that it is higher than the height of the water surface retained in the adjustment groove at the final pressure loss of the filter.

[0013] By providing a step on the secondary bottom surface and setting the height of the second bottom surface higher than the water level held in the adjustment groove, rainwater can be prevented from entering the indoors even if the pressure loss of the filter increases.

[0014] The present invention is also characterized in that a drain hole for the lower frame is provided on at least one of the bottom surface and the upstream side surface of the lower frame.

[0015] Rainwater retained in the filter collects in the lower frame and can be drained to the primary side through the drainage holes in the filter frame, preventing unnecessary increase in the amount of water retained in the secondary side adjustment groove.

[0016] The present invention is also characterized in that the bottom surface of the lower frame is inclined toward the upstream side, which reduces the contact point of the lower end of the filter with the bottom surface of the lower frame, allowing rainwater retained in the filter to be smoothly guided to the drain hole in the filter frame.

[0017] In addition, a raised portion can be provided from the bottom of the lower frame on the door side of the lower frame. This raised portion allows the filter to be lifted at an angle when removed from the opening, causing rainwater retained in the filter to fall into the lower frame. This effectively prevents rainwater retained in the filter from accidentally seeping into the room when the filter is removed from the ventilation fan mounting frame due to improper handling.

[0018] Furthermore, the ventilation fan mounting frame of the present invention is characterized in that a drain hole for the first embankment wall is provided at the lower end of the first embankment wall.

[0019] This drain hole prevents the rainwater held in the adjustment groove from rising above the head pressure due to pressure loss, and prevents the rainwater from seeping inside the building.

[0020] Furthermore, the drain hole for the first embankment wall may be located outside the blades of the ventilation fan fixed to the ventilation fan unit installation part. When located outside the blades of the ventilation fan, rainwater in the adjustment groove is less affected by the intake air flow from the ventilation fan, and flows smoothly out of the drain hole to the bottom of the primary side and discharged outdoors.

[0021] The first embankment wall drain hole and the filter frame drain hole can also be positioned in different positions in terms of their left-right phase, so that the rainwater discharged from the filter frame drain hole is no longer affected by the intake air flow from the ventilation fan and flows reliably to the bottom of the primary side and is discharged outdoors. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a cross-sectional view of a ventilation fan mounting frame according to the present invention being installed on the exterior wall of a building. [Figure 2] 1A and 1B are views of the ventilation fan mounting frame according to the present invention as seen from the downstream side, in which (a) is a view with the opening / closing door closed, and (b) is a view with the opening / closing door open. [Figure 3] 1A and 1B are diagrams showing the positions of the lower frame, filter, adjustment groove, and raised portion of the ventilation fan mounting frame of the present invention, where (a) is a view from the right side with the opening door open, and (b) is a view from the inside of the left side. [Figure 4] 1 is a cross-sectional perspective view showing the positional relationship between the drain holes in the first embankment wall of the ventilation fan mounting frame and the drain holes in the lower frame of the present invention. FIG. [Figure 5] FIG. 10 is a view showing a louver installed on the ventilation fan mounting frame according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In each drawing, the same or corresponding parts are assigned the same reference numerals. The outdoor side is the upstream side, and the indoor side is the downstream side. As shown in Figure 1, the symbols used to indicate directions are "a" for the ceiling side, "b" for the bottom side, "c" for the left side, "d" for the right side, "e" for the upstream side, and "f" for the downstream side. Left and right are defined as left and right when viewed from the upstream side.

[0024] Fig. 1 is a cross-sectional view of a ventilation fan mounting frame 1 according to the present invention installed in a through-hole 3 in an exterior wall 2 of a building, and Fig. 2 is a perspective view of the ventilation fan mounting frame 1 with a support member 4 attached, viewed from the downstream side. The ventilation fan mounting frame 1 has a rectangular outdoor opening 5 that opens to the outdoors and a rectangular indoor opening 6 that opens to the indoors, with a hollow cylindrical space between the outdoor opening 5 and the indoor opening 6 forming a continuous ventilation passage 7.

[0025] The hollow, cylindrical ventilation fan mounting frame 1 is surrounded by a ceiling surface 1a, a bottom surface 1b, a left side surface 1c, and a right side surface 1d (1a, 1b, 1c, and 1d are not numbered in the figure). The ventilation fan mounting frame 1 has functional sections: an exterior wall mounting section 8, a filter housing section 9, and a ventilation fan unit mounting section 10. The filter housing section 9 and the ventilation fan unit mounting section 10 are located on the indoor side. For convenience, the ceiling surface, bottom surface, left side surface, and right side surface of each functional section will be explained using the reference numerals of each functional section, but they all form a continuous ceiling surface 1a, bottom surface 1b, left side surface 1c, and right side surface 1d.

[0026] The exterior wall mounting section 8 is tubular and box-shaped, and support members 4 are fixed vertically to the ends of left and right side surfaces 8c (not shown in the figure) and 8d of the exterior wall mounting section 8. The support members 4 are fixed to furring strips 11, which are reinforcing materials for the exterior wall of the building. When the support members 4 are fixed to the furring strips 11, the outdoor opening 5 is positioned so that it protrudes slightly outside the exterior wall 2.

[0027] A waterproof board 12 for weather protection is fixed to the outdoor opening 5, and sealant is filled into the gap formed by the waterproof board 12, the exterior wall 2, and the tip of the exterior wall mounting part 8 to prevent rainwater from seeping into the exterior wall. A weather cover 13 is installed on the waterproof board 12. The bottom surface 8b of the exterior wall mounting part 8 is slightly inclined downward toward the outdoor side.

[0028] Next, the filter accommodating section 9 will be described. The filter accommodating section 9 literally accommodates a filter 14. As shown in FIG. 2(b), a vertical slit-shaped opening 15 is provided on the right side surface 9d of the filter accommodating section 9, and an opening / closing door 16 is provided to cover the opening 15. Note that the opening 15 and the opening / closing door 16 may also be provided on the left side surface 9c (no reference numerals are shown in the figure) depending on the layout of the building, etc.

[0029] The filter accommodating section 9 is also box-shaped like a cylinder like the exterior wall mounting section 8, but has a slightly different shape. The ceiling surface 9a has a ceiling inclined surface 9a1 that slopes upward from the end of the horizontal ceiling surface 8a of the exterior wall mounting section 8 toward the indoor side, and a ceiling horizontal surface 9a2.

[0030] As shown in Figure 3(a), the bottom surface 9b of the filter accommodating section 9 has a first bottom surface 9b1 that is continuous with the bottom surface 8b of the outer wall mounting section 8, and a second bottom surface 9b2 that is one step higher via a step surface 17 that forms a step with the first bottom surface 9b1.

[0031] As shown in Figure 2(b), the slit-shaped opening 15 is provided in an area surrounded by the ceiling horizontal surface 9a2 and the first bottom surface 9b1, and the step surface 17 is provided so as to be on the indoor side of the opening 15.

[0032] The filter 14 is attached to or detached from the filter accommodating section 9 through a slit-shaped opening 15 by opening the door 16, and a filter frame 18 is provided in the filter accommodating section 9 to match the position of the opening 15. The filter frame 18 has a frame shape with a U-shaped cross section so as to sandwich the outer edge of the filter 14 from the upstream and downstream sides, and is provided on the inner surface of the ceiling surface 9a and the inner surfaces of the left and right side surfaces 9c and 9d. Meanwhile, the lower frame 18b of the filter frame 18 is provided so that its lower frame bottom surface 18b' is higher than the first bottom surface 9b1, rather than being directly provided on the inner surface of the first bottom surface 9b1.

[0033] Filter 14 is supported by a U-shaped cross-section ceiling frame 18a and left and right side frames 18c and 18d (not shown), and the lower part of filter 14 is supported by a lower end 18f' on the indoor side of lower frame bottom surface 18b'. Because lower frame bottom surface 18b' is inclined, gravity acting on the water droplets of rainwater collected on filter 14 increases, making it easier for the surface tension of the droplets to be broken and for them to separate from filter 14.

[0034] As shown in Figures 4(a) and 4(b), one or more drainage holes 20 are provided at the lower end of the outdoor side surface 18e of the lower frame. The drainage holes 20 may be provided on either the outdoor side of the bottom surface 18b' of the lower frame or on the outdoor side surface 18e of the lower frame, or may be provided on both. In either case, the drainage holes 20 should be provided in positions that allow easy drainage along the slope of the bottom surface 18b' of the lower frame.

[0035] Furthermore, the lower end of the lower frame indoor side surface 18f is grounded to the first bottom surface 9b1, forming an embankment wall 21 that extends across the entire left-right width of the filter accommodating section 9. This embankment wall may be a separate member from the filter frame 18. The upstream side of the filter frame 18 and the embankment wall 21 is the primary side, and the downstream side is the secondary side.

[0036] The secondary side has at least a step surface 17, which defines a first bottom surface 9b1 and a second bottom surface 9b2 that is higher than the first bottom surface 9b1. Here, for convenience, this step surface 17 will be referred to as the second embankment wall 17, together with the embankment wall 21 provided on the filter frame 18. The embankment wall 21 provided on the filter frame 18 will also be referred to as the first embankment wall. The area surrounded by the first embankment wall 21, the second embankment wall 17, and the left and right side surfaces of the filter accommodating section will be referred to as the adjustment groove 22. The adjustment groove 22 functions as a water-retaining groove through which rainwater captured by the filter 14 flows down.

[0037] The height of the second bottom surface 9b2, i.e., the height of the second embankment wall 17, is set higher than when the filter 14 reaches its final pressure loss, the pressure loss on the primary and secondary sides reaches its maximum, and the water surface height retained in the adjustment groove 22 reaches its highest.

[0038] Rainwater retained in the adjustment groove 22 cannot exceed the height of the second embankment wall 17, preventing the rainwater from seeping into the second bottom surface 9b2. The second bottom surface 9b2 is sloped downward toward the outdoors, similar to the bottom surface 8b of the exterior wall installation portion 8.

[0039] At least one drain hole 23 is provided at the lower end of the first embankment wall 21. The drain hole 23 provided at the lower end of the first embankment wall is referred to as the first embankment wall drain hole 23 to distinguish it from the drain hole 20 provided in the lower frame 18. The drain hole 20 provided in the lower frame 18 will be referred to as the lower frame drain hole 20. Both the lower frame drain hole 20 and the first embankment wall drain hole 23 open to the primary side, and rainwater that flows out to the primary side is actively drained to the outdoors along the downward slope toward the outdoors without being affected by pressure loss.

[0040] As shown in Fig. 4, the lower frame drain hole 20 and the first embankment wall drain hole 23 are arranged so that their phases in the left-right direction are not the same. Specifically, the first embankment wall drain hole 23, which is provided at the lower end of the first embankment wall 21 that separates the primary side from the secondary side, is arranged so as to be located outside the blades of the ventilation fan 26 fixed to the ventilation fan unit installation section 10, which will be described later. In Fig. 4(c) and Fig. 4(d), the positions of the lower frame drain hole 20 and the first embankment wall drain hole 23 are indicated by thick lines (deformed) for ease of understanding.

[0041] One of the reasons for changing the phase is as follows. Because the adjustment groove 22 is located on the secondary side, rainwater falling into the adjustment groove 22 is affected by pressure loss while the ventilation fan is operating. Therefore, rainwater accumulates in the adjustment groove 22 while maintaining a constant water level due to head pressure, but rainwater that exceeds the water level due to head pressure is discharged to the primary side through the first embankment wall drain hole 23. This is to minimize the influence of the intake air flow from the ventilation fan 26 when the rainwater is discharged from the adjustment groove 22 on the secondary side.

[0042] Another reason is that when rainwater discharged from the lower frame drain hole 20 falls onto the first bottom surface 9b1, if the first embankment wall drain hole 23 is located in the same phase, the rainwater discharged from the lower frame drain hole 20 may be pulled from the first embankment wall drain hole 23 into the adjustment groove 22 on the secondary side due to the influence of the ventilation fan's supply air pressure and secondary-side pressure loss. To avoid this influence, the lower frame drain hole 20 and the first embankment wall drain hole 23 are arranged so that their phases are not in the same position in the left-right direction. Furthermore, because the lower frame drain hole 20 is located on the primary side and is slightly farther from the ventilation fan 26 than the first embankment wall 21, the influence of the supply air flow is relatively small. For this reason, the lower frame drain hole 20 is located relatively closer to the center of the left-right width than the first embankment wall drain hole 23.

[0043] Furthermore, as shown in Figure 3, when opening door 16 is opened and filter 14 is removed from opening 15, a raised portion 24 is provided at the bottom end of opening 15 to prevent rainwater remaining in filter 14 from falling into the room. The top end of this raised portion 24 is positioned higher than the bottom end of filter 14. When filter 14 is removed from opening 15, this raised portion 24 lifts filter 14 so that its bottom end clears the top end of raised portion 24, allowing rainwater remaining in filter 14 to fall onto lower rail 18.

[0044] Next, the ventilation fan unit installation section 10 will be described. The ventilation fan unit 25 has a ventilation fan 26 and a shutter 27 that opens when the ventilation fan 26 is operating and closes when the ventilation fan 26 is not operating to prevent rainwater from entering the room. As shown in FIG. 2(a), the ventilation fan unit installation section 10 is a flange section 28 provided at the indoor opening 6. The ventilation fan unit 25 can be installed on the flange section 28 of the indoor opening 6 by either fixing the ventilation fan unit 25 directly to the flange section 28 or by fixing the ventilation fan unit 25 to a ventilation fan unit opening / closing door 30 that can be opened and closed via a hinge 29.

[0045] The lower end of the blades of the ventilation fan installed on the flange portion 28 of the indoor opening 6 is positioned higher than the second bottom surface 9b2. This reduces the effect of the intake airflow from the ventilation fan 26 on the rainwater retained in the adjustment groove 22, and the surface of the rainwater accumulated in the adjustment groove 22 can be kept calmer than when the intake airflow directly hits it. This minimizes the infiltration of scattered rainwater into the room through the ventilation fan 26.

[0046] The ventilation fan mounting frame 1 according to the present invention is not limited to the above-described embodiment, and for example, the second embankment wall 17 may not be vertical, but may be inclined toward the indoor side.

[0047] By providing the adjustment groove 22, the distance between the filter 14 and the ventilation fan 26, which is required to prevent rainwater splashes from scattering to the ventilation fan 26, can be shortened, and the upstream and downstream lengths of the filter housing part 9 of the ventilation fan mounting frame can be shortened, making it possible to make the ventilation fan mounting frame compact.

[0048] The present invention is not limited to the above-described embodiment. For example, the first embankment wall drainage hole 23 provided at the lower end of the first embankment wall 21 does not necessarily have to be a hole provided in the wall surface. For example, when the first embankment wall 21 is welded as a separate member from the lower end of the lower frame 18b, if the lower end of the first embankment wall 21 is fixed to the first bottom surface 9b1 by partial welding or the like, a small gap will be created between the first bottom surface 9b1 and the lower end of the first embankment wall 21. It is also possible to allow rainwater accumulated in the adjustment groove 22 to flow out to the primary side through this gap, and the first embankment wall drainage hole 23 includes such a gap.

[0049] Moreover, as shown in FIG. 5, it is also possible to provide a louver or a grille 31 instead of the weather cover 13. [Explanation of symbols]

[0050] 1 Ventilation fan mounting frame 2. Exterior walls 3 Through holes 4 Support member 5 Outdoor opening 6 Indoor opening 7 Ventilation duct 8 External wall installation part 9 Filter housing section 9 9b1 First bottom surface 9b2 Second bottom surface 10 Ventilation fan unit installation area 11. Fuselage 12 Waterproof board 13 Weather cover 14 Filters 15 Opening 16 Opening and closing doors 17 Step surface, second embankment wall 18 Filter Frame 18b Lower Frame 18b´ Bottom of lower frame 20 Drain holes for lower frame 21 First Embankment Wall 22 Adjustment groove 23 First levee wall drainage hole 24 Rising section 25 Ventilation fan unit 26 Ventilation fan 27 Shutter 28 Flange 29 Hinge 30 Opening and closing door for ventilation fan unit 31 Garari

Claims

1. The ventilation fan mounting frame that penetrates the exterior wall of the building is The ventilation duct is a cylindrical duct having an outdoor opening that opens to the outdoor side of the exterior wall and an indoor opening that opens to the indoor side, The ventilation fan mounting frame has functional sections of an exterior wall installation section, a filter accommodating section, and a ventilation fan unit installation section, and the filter accommodating section and the ventilation fan unit installation section are arranged on the indoor side of the building, the exterior wall installation portion is installed in the through-hole of the exterior wall so that the outdoor opening is positioned on the outdoor side of the exterior wall, The filter accommodating section is provided with an opening / closing door so that the filter can be detachably accommodated from either the left or right side, and a filter frame that supports the filter is provided inside the filter accommodating section, A ventilation fan unit including a shutter and a ventilation fan is fixed to the ventilation fan unit installation section, The filter frame divides its upstream side into a primary side and its downstream side into a secondary side, At least one step is provided on the bottom surface of the secondary side of the filter accommodating section, and the upstream side of the step on the bottom surface is a first bottom surface and the downstream side is a second bottom surface, and the first and second bottom surfaces each have an inclination so as to descend toward the outdoor side, and the first bottom surface is provided lower than the second bottom surface, The filter frame is provided on the first bottom surface side, and a lower frame bottom surface of the filter frame is located at a position higher than the first bottom surface, A first embankment wall is provided on the downstream side surface of the lower frame, and the first embankment wall has a height from the first bottom surface to the height of the lower frame and is provided across the entire left and right width of the ventilation fan mounting frame, an adjustment groove surrounded by the first embankment wall and a second embankment wall forming the step is provided on the secondary-side bottom surface; A ventilation fan mounting frame characterized in that the height of the second embankment wall is set so that it is higher than the height of the water surface retained in the adjustment groove at the final pressure loss of the filter.

2. 2. The ventilation fan mounting frame according to claim 1, wherein a drain hole for the lower frame is provided on at least one of the bottom surface and the upstream side surface of the lower frame.

3. The ventilation mounting part according to claim 1 , wherein the bottom surface of the lower frame is inclined toward the upstream side.

4. 2. The ventilation fan mounting frame according to claim 1, wherein a rising portion is provided on the bottom surface of the lower frame on the side of the door.

5. 2. The ventilation fan mounting frame according to claim 1, wherein a drain hole for the first embankment wall is provided at the lower end of the first embankment wall.

6. The ventilation fan mounting frame described in claim 2, characterized in that a drain hole for the first embankment wall is provided at the lower end of the first embankment wall, and the drain hole for the first embankment wall is provided outside the blade portion of the ventilation fan fixed to the ventilation fan unit installation portion.

7. The ventilation fan mounting frame according to claim 5, wherein the first embankment wall drain hole is provided outside the blade portion of the ventilation fan fixed to the ventilation fan unit installation portion.

8. The ventilation fan mounting frame according to claim 6, wherein the drain holes for the lower frame are provided at positions that are out of phase with the drain holes for the first embankment wall in the left-right direction.

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