Ventilation system

Abstract

To provide a ventilation device with a high function of preventing rainwater intrusion. [Solution] The ventilation device of the present invention comprises a cylindrical casing for ventilation attached to a vent in the exterior wall of a building, and a water-draining filter disposed inside the cylindrical casing. The water-draining filter is preferably disposed inside the cylindrical casing with a downward inclination so that its lower end is located on the indoor side of the upper end.

Description

Technical Field

[0001] The present invention relates to a ventilation device provided with rain protection measures.

Background Art

[0002] Conventionally, ventilation devices for taking in outside air into a building such as a warehouse have been provided on the outer wall of the building. That is, a rain hood is attached to an outside air intake provided in the wall of the building, and an insect-proof mesh filter, a pre-filter, a medium-performance filter, a pressure fan (pressure ventilation fan), etc. are installed in the casing on the indoor side. Also, in order to prevent the intrusion of rainwater, it is also known to attach a horizontal lattice gallery to the outdoor side together with the rain hood (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Even when a gallery as described in Patent Document 1 is attached, in the case of a typhoon or a local heavy rain, etc., the intrusion of rainwater becomes intense through the gallery. Therefore, rainwater also intrudes into the inside of the casing, and the pre-filter and the medium-performance filter get wet, resulting in an increase in static pressure and a decrease in efficiency. Also, when moisture drips from the filter to which rainwater adheres and continues to accumulate on the bottom surface of the filter casing, rust is generated on the bottom surface, and eventually it may cause water leakage.

[0005] Particularly, in the case of coastal areas near the sea, fine particles of seawater lifted by wave splashes are likely to intrude into the ventilation device. Therefore, water containing salt continues to accumulate in the casing, making it easier to generate rust from the inside. When rust occurs on the casing, maintenance such as replacement becomes necessary.

[0006] The object of the present invention is to provide a ventilation device that has a high function of preventing rainwater intrusion. [Means for solving the problem]

[0007] The ventilation device of the present invention comprises a cylindrical casing for ventilation attached to a vent in the exterior wall of a building, and a water-draining filter disposed inside the cylindrical casing. [Effects of the Invention]

[0008] According to the present invention, since a water-draining filter is placed inside the casing, it is possible to prevent rainwater from entering the casing even during strong winds and rain such as typhoons and heavy rains. As a result, the increase in pressure loss of the filter is suppressed, energy loss due to the increase in pressure loss is reduced, and the filter performance can be maintained for a long period of time. [Brief explanation of the drawing]

[0009] [Figure 1A] This is a longitudinal cross-sectional view showing a ventilation device according to one embodiment of the present invention. [Figure 1B] Figure 1A is a front view of the ventilation system shown. [Figure 1C] Figure 1A is a rear view of the ventilation system shown. [Figure 2A] Figure 1A is a front view of the rainproof louver shown. [Figure 2B] Figure 2A is a horizontal cross-sectional view of the rainproof louver shown. [Figure 3] This is a plan view showing the vanes that make up the rainproof louvers in a disassembled state. [Figure 4A] Figure 1A is a perspective view of the drain filter shown. [Figure 4B] Figure 1A is a cross-sectional view of the drain filter in use. [Figure 5] This is a side view showing the mechanism for draining rainwater that hits the rainproof grille and water drainage filter. [Figure 6]This is a side view showing the drainage mechanism for rainwater that accumulates on the inner surface of the door that seals the side of the ventilation device casing. [Figure 7] This is a longitudinal cross-sectional view showing an example of how the ventilation device of the present invention is used. [Figure 8] This is a longitudinal cross-sectional view showing another example of how the ventilation device of the present invention is used. [Figure 9] A cross-sectional view showing a ventilation device according to another embodiment of the present invention. [Figure 10] This is an explanatory diagram showing a ventilation device according to yet another embodiment of the present invention. [Modes for carrying out the invention]

[0010] A ventilation device according to one embodiment of the present invention will be described below with reference to the drawings. However, the figures referenced below are simplified representations of embodiments of the present invention for the sake of explanation and do not faithfully represent the dimensions of the actual components or the dimensional ratios of each component. Furthermore, the ventilation device of the present invention may include any components not shown in the figures. Figure 1A is a longitudinal cross-sectional view showing a ventilation device according to one embodiment of the present invention, and Figures 1B and 1C are its front and rear views, respectively.

[0011] As shown in Figures 1A to 1C, the ventilation device according to this embodiment has a rainproof grille 2 and a water-draining filter 3 arranged inside a cylindrical casing 1. The cylindrical casing 1 is attached to a ventilation opening 4b provided in the building 4 and has an outdoor opening 1a and an indoor opening 1b. Outside air is introduced into the building through these openings 1a and 1b. In Figure 1A, the area to the left of the building 4 is outdoors, and the area to the right is indoors. The cylindrical casing 1 (hereinafter sometimes abbreviated as casing 1) is attached to the building 4 from the indoor side so as to communicate with the ventilation opening 4b of the building 4. An outdoor hood 29, as shown in Figure 9, may be attached to the outdoor side of the ventilation opening 4b of the building 4. The casing 1 is made from, for example, a steel plate, a stainless steel plate, or the like. In the following description, attention is paid to the air flow direction, and the outdoor side may be referred to as the upstream side and the indoor side as the downstream side. Further, in the following description, the front face refers to the face on the outdoor side, and the back face refers to the face on the indoor side.

[0012] The rainproof cover 2 is attached inside the casing 1 so as to cover the outdoor opening 1a of the casing 1. That is, inside the casing 1, a first partition plate 5 and a second partition plate 6 are arranged in this order from the upstream side to the downstream side of the air flow, and the rainproof cover 2 is disposed on the outdoor side of the first partition plate 5 so as to block the opening 5a (see FIG. 5) of the first partition plate 5.

[0013] As shown in FIGS. 1A and 1B, guides 7a and 7b each having a U-shaped or L-shaped cross section are attached horizontally facing each other above and below the front face on the outdoor side of the first partition plate 5. The rainproof cover 2 is inserted into the casing 1 from the side opening 1c of the casing 1 and slid along the guides 7a and 7b to a position where the opening 5a of the first partition plate 5 is blocked, and is fixed to one end of the guides 7a and 7b via a fixture 8 by screwing or the like.

[0014] As shown in FIGS. 2A and 2B, the rainproof cover 2 includes a plurality of vertical fins 9 and a frame body 10 that houses and holds the plurality of fins 9 so that water can easily flow down. Mounting plates 9a are formed at both ends in the length direction of each fin 9, and the mounting plates 9a are attached to the bottom plate 10a and the top plate 10b of the frame body 10 by riveting, screwing or the like, respectively. The plurality of fins 9 are arranged in parallel between the both side plates 10c, 10c of the frame body 10.

[0015] As shown in FIG. 3, in a plan view, the fin 9 includes a substantially L-shaped main body 91, first return pieces 92, 92 formed at both ends of the main body 91, and a second return piece 93 protruding from a bent portion of the main body 91 or its vicinity. By providing the first return pieces 92, 92 and the second return piece 93 on the main body 91, it is possible to prevent rainwater from passing between the fins 9, 9. The first return piece 92 may be formed on only one of the ends of the main body 91. The second return piece 93 is attached to the main body 91 by welding, screwing, or the like. The first and second return pieces 92 and 93 have the function of preventing rainwater from passing through the gap between the vanes 9, 9. For example, aluminum extruded products can be used for the main body 91 having the first return pieces 92, 92 and the second return piece 93.

[0016] The L-shaped body 91 is preferably positioned at an angle with respect to the airflow direction indicated by arrow A in Figure 3. The angle α of inclination of the body 91 with respect to the airflow direction indicated by arrow A can be determined according to the opening ratio of the rainproof louver 2. In this invention, the opening ratio of the rainproof louver 2 is preferably 60% or less, more preferably 40% or less. If the opening ratio of the rainproof louver 2 is 60% or less, the intrusion of rainwater can be suppressed.

[0017] Here, the opening ratio, also known as the effective ventilation area, refers to the area through which air passes in the rainproof louver 2. Specifically, the opening ratio can be calculated using the following formula. Opening ratio = {Opening area L of rainproof louvers 2 / Opening area M of frame 10} × 100 Here, the opening area L of the rainproof louver 2 can be calculated from (side opening area L1 of the rainproof louver 2) + (opening area L2 of the rainproof louver 2). Side opening area L1 = w1 × H of rainproof louver 2 The opening area L2 of rainproof louvers 2 is calculated as w2 × H × number of 9 slats. w1: Width of the side opening of the rainproof louver 2 (see Figure 2B) w2: Minimum gap width between the wing plates 9, 9 including the first return piece 92 and the second return piece 93 (see Figure 2B) H: Height of the outdoor (upstream) side opening of frame 10 (see Figure 2A) Opening area M = W × H of frame 10 W: Width of the outdoor (upstream) side opening of frame 10 (see Figure 2A) Note that in Figure 2B, only one side of the rainproof louver 2 is shown with a width w1, but there may be openings on both sides, in which case the areas of both openings should be added together.

[0018] As shown in Figure 2B, the bottom plate 101 of the frame 10 has multiple first drainage holes 11a. Rainwater that is prevented from entering by the rainproof grille 2 flows down along the vane 9 and is discharged from the first drainage holes 11a. A packing 13 is attached to the rear periphery of the frame 10 by adhesive or the like to improve the contact with the first partition plate 5 and prevent rainwater leakage.

[0019] As shown in Figure 1A, a water drain filter 3 is placed inside the casing 1, which is located on the indoor side of the rainproof grille 2. The water drain filter 3 is attached to the front surface of the downward-sloping second partition plate 6. Therefore, the water drain filter 3 is placed inside the casing 1 with a downward slope such that its lower end 3a is located on the indoor side of its upper end 3b. As shown in Figure 1C, the second partition plate 6 has an exhaust opening 6a in the center, and the water drain filter 3 blocks this opening 6a, preventing fine rainwater that has passed through the rainproof grille 2 from entering the interior.

[0020] The drain filter 3 has a configuration in which a drain filter body 32 is housed within a frame 31 made of metal, resin, or the like, as shown in Figure 4A. The drain filter body 32 is made of fibers molded into a mat or sheet, and its periphery is held in place by the frame 31. To prevent the drain filter body 32 from detaching from the frame 31 and scattering, a retaining support 34 is attached to the opening 33 on the front (upstream) side of the drain filter 3. A similar support (not shown) is also attached to the opening on the back (downstream) side of the drain filter 3 to prevent the drain filter body 32 from detaching from the frame 31. As the support 34, for example, a wire as shown in Figure 4A can be used, and it is used in a V-shape as shown in the figure, but other shapes such as a grid shape may also be used.

[0021] For example, an eccentric cam mechanism can be used to attach the drain filter 3 to the second partition plate 6. That is, as shown in Figure 4B, when the drain filter 3 closes the exhaust opening 6a provided in the center of the second partition plate 6, eccentric cams 26, 26 are positioned on the upper and lower front surfaces of the drain filter 3, respectively, so as to press the drain filter 3 against the second partition plate 6. Each eccentric cam 26 is supported by a rotating shaft 27. The rotating shaft 26 is rotatably held by a bearing member 41 attached to a support member 40. As the support member 40, for example, an L-shaped angle can be used, and as shown in Figure 1A, it is installed between the first partition plate 5 and the second partition plate 6 inside the casing 1.

[0022] To install the drain filter 3 inside the casing 1, insert the drain filter 3 through the side opening 1c of the casing 1 shown in Figure 1A, slide it inside the casing 1 to a predetermined position (i.e., the position that closes the exhaust opening 6a provided in the center of the second partition plate 6) using the guide 25 shown in Figure 4B, and then rotate the rotating shaft 27 to press the drain filter 3 against the front surface of the second partition plate 6 with the eccentric cam 26. The rotation of the eccentric cam 26 can be done by rotating the handle 12 (see Figure 6) attached to one end of the rotating shaft 27 from the side opening 1c of the casing 1. To remove the drain filter 3 from the casing 1, rotate the eccentric cam 26 in the opposite direction to the above, and the drain filter 3 can be easily pulled out.

[0023] The mat-like or sheet-like drain filter body 32 shown in Figures 4A and 4B is formed by molding fibers into a three-dimensional structure. Since the pressure loss of the drain filter body 32 increases when dust is collected, it is preferable to make the three-dimensional structure coarse with thick fibers so that the pressure loss does not increase too much even when dust is collected. The thickness of the fibers is preferably around 600 to 4000 dtex, and more preferably 800 to 2000 dtex. Regarding the pressure loss of the drain filter body 32, it is preferable that the initial pressure loss be 50 Pa or less when the thickness t of the drain filter body 32 is 50 mm and the airflow velocity is 2.5 m / s. To maintain drainage performance, the thickness t of the drainage filter body 32 is preferably 10 mm to 70 mm, and more preferably 20 mm to 70 mm. The drainage filter body 32 is not limited to a single three-dimensional structure, but may be made by stacking multiple three-dimensional structures, as long as the overall thickness is as described above.

[0024] Examples of materials for the drain filter body 32 include fibers such as polyvinylidene chloride, polypropylene, polyethylene, polyester, and polyamide. These fibers are preferably non-absorbent, and may be treated with a water-repellent finish as needed.

[0025] As described above, the drain filter 3 in this embodiment is inclined downwards, so rainwater that hits the drain filter 3 is more likely to fall downwards without accumulating on the drain filter 3. As shown in Figure 1A, the inclination angle θ of the drain filter 3 with respect to the vertical line A is preferably between 5° and 60°, and more preferably between 10° and 30°. This makes it easier to effectively remove captured rainwater without obstructing airflow.

[0026] To determine the preferred inclination angle θ of the drain filter 3, drain filters 3 were placed in a cylindrical casing 1 with inclination angles θ of 5°, 10°, 15°, 20°, and 25° relative to the vertical line A. Next, a high-pressure spray simulating wind and rain during a typhoon was applied to the casing 1 from the upstream direction, parallel to the axial direction of the casing 1, and the permeation of water into the drain filter 3 was checked. The results showed that when the inclination angle θ was less than 5°, a small amount of water permeated downstream of the drain filter 3, but when the inclination angle θ was set to 10°, the amount of water permeating through the drain filter 3 decreased significantly. At inclination angles θ of 15° or more, almost no water permeated through the drain filter 3. As the inclination angle θ of the drain filter 3 increases, the door 16 of the casing 1 (see Figure 6) becomes larger, so an angle of 30° or less is appropriate. The tilt angle θ of the drain filter 3 may be set to 0°, meaning the front surface of the drain filter 3 is perpendicular to the direction of airflow within the casing 1.

[0027] In order to discharge rainwater that hits the drain filter 3 to the outside, it is preferable that at least the surface of the inner bottom surface 1d of the casing 1 from the outdoor opening 1a to below the drain filter 3 be an inclined surface that slopes downward from the indoor side to the outdoor side. This allows rainwater that falls on the inner bottom surface 1d of the casing 1 to be quickly discharged to the outside. As shown in Figure 5, the inclination angle α of the inner bottom surface 1d is preferably 5° or more, more preferably 15° or more, and about 30° or less with respect to the horizontal line B (a line perpendicular to the vertical line A shown in Figure 1A). If it is 5° or more, rainwater that falls on the inner bottom surface 1d of the casing 1 can be discharged to the outside from the casing 1 without obstruction through the drainage gap 15, and if it is 15° or more, rainwater can be drained to the outside even more without obstruction.

[0028] The following describes the mechanism for discharging rainwater that hits the rainproof grille 2 and the water drain filter 3. As shown in Figure 1A, air containing rainwater that enters the ventilation opening 4b of the building 4 from outside first hits the rainproof grille 2, where much of the rainwater is separated from the air and falls downward. As shown in Figures 2B and 5, the rainproof grille 2 is provided with a first drain hole 11a in the bottom plate 101 of the frame 10. Also, as shown in Figure 5, the guide 7a on which the bottom plate 101 of the frame 10 is placed is provided with a second drain hole 11b that communicates with the first drain hole 11a. Therefore, the rainwater that falls from the rainproof grille 2 passes through the first and second drain holes 11a and 11b and falls to the inner bottom surface 1d of the casing 1, and is discharged to the outside from the inclined inner bottom surface 1d.

[0029] On the other hand, as shown in Figure 5, fine rainwater that passes through the rainproof grille 2 hits the drain filter 3 on the indoor side and falls downward. The rainwater that falls from the drain filter 3 falls onto the inner bottom surface 1d of the casing 1. The lower end of the first partition plate 5 forms a drainage gap 15 between it and the inner bottom surface 1d of the casing 1 (see also Figure 1B). Therefore, the rainwater that falls onto the inner bottom surface 1d can also be discharged to the outside, and there is no need to provide a separate drain pipe for drainage. Alternatively, instead of the gap 15, multiple through holes may be arranged in a row.

[0030] Figure 6 is a side view showing the mechanism for draining rainwater that accumulates on the inner surface of a door 16 that closes the side opening 1c of the casing 1. Packing material 17 is provided on the periphery and center of the inner surface of the door 16 to prevent leakage of rainwater and air. On the other hand, a cover material 18 is attached to the side opening 1c of the casing 1, except for the parts necessary for attaching and detaching the rainproof grille 2 and the drain filter 3, to prevent leakage of rainwater and air. Therefore, in order to prevent rainwater from hitting the inner surface of the door 16 and falling from the openings 19a and 19b for attaching and detaching the rainproof grille 2 and the drain filter 3 and accumulating at the lower end of the packing material 17, a drainage bypass hole 20 is provided in the cover material 18 at the lower end where rainwater accumulates, so that the rainwater that accumulates on the inner surface of the door 16 can be drained.

[0031] According to this embodiment, rainwater that enters the casing 1 can be quickly discharged even during strong winds such as typhoons, preventing an increase in filter pressure loss due to rainwater adhering to the filter surface inside the casing 1, maintaining filter performance, and saving energy. In addition, it is possible to suppress the occurrence of rust caused by rainwater accumulation in the casing 1.

[0032] Figure 7 is a longitudinal cross-sectional view showing one mode of use of the ventilation device of the present invention. In Figure 7, the same reference numerals are used for the same components as in the ventilation device described above, and detailed explanations are omitted. As shown in Figure 7, the casing 1, which is equipped with a rainproof louver 2 and a water drain filter 3, is located on the indoor side of the building 4. Another casing 23 is connected to the indoor side of the casing 1, and a pre-filter 21 and a medium-high performance filter 22 are housed inside the casing 23, in order from the outdoor side. Furthermore, a pressure fan 24 may be connected to the indoor side of this casing 23. The pressure fan 24 can draw outside air into the building.

[0033] A pre-filter 21 is placed upstream (outdoors) of the medium-to-high performance filter 22, allowing it to capture not only dust but also insects. In other words, the insect-proof sheet has a finer mesh and is flatter and shallower than the pre-filter 21, resulting in a smaller collection area, whereas the pre-filter 21 typically has a thickness of about 20 mm, resulting in a larger collection area.

[0034] Furthermore, an insect-proof sheet (not shown) may be placed to prevent pests from entering the building. A metal or resin mesh filter can be used as the insect-proof sheet. Specifically, for example, it is preferable to house the pre-filter 21 and the insect-proof sheet in a tightly sealed state within a single frame. If the pre-filter 21 is located upstream of the insect-proof sheet, it is possible to prevent an increase in pressure loss due to clogging of the insect-proof sheet and extend the replacement cycle of the insect-proof sheet. Alternatively, the insect-proof sheet may be placed upstream (outdoors) of the pre-filter 21.

[0035] The medium-to-high performance filter 22 may be a salt-resistant filter. The salt-resistant filter should be installed on the indoor side of the drain filter. Suitable salt-resistant filters include medium-to-high performance salt-resistant filters made of glass fiber, such as those manufactured by Nitta Corporation (product names: "Salt Emillent", "Spleats (SLT4500)", and salt-resistant HEPA filters (product name: "Spleats (S1500)"). The salt-resistant filter can remove saltwater-containing mist (saltwater particles), allowing fresh air to be supplied indoors.

[0036] A ventilation system having the embodiment shown in Figure 7 can not only prevent rainwater from entering during heavy rains, but also have insect-repellent and salt-removing functions, allowing for a compact design. Furthermore, since it does not require a drain pipe for drainage, installation of the ventilation system is easy.

[0037] A modified version of the ventilation device shown in Figure 7 is shown in Figure 8. As shown in Figure 8, this ventilation device has a cylindrical bent casing 28 interposed between a casing 1 equipped with a rainproof louver 2 and a water drain filter 3, and another casing 23 equipped with a pre-filter 21 and a medium-high performance filter 22. The bent casing 28 shown in Figure 8 is bent at almost a right angle, but the bending angle is not limited. Also, the bent casing 28 shown in Figure 8 is bent almost upward relative to the casing 1, but the bending direction can be any direction within 360° around the axis of the casing 1, for example, it may be bent downward. In this ventilation system, outdoor air is introduced into the room through casing 1, bent casing 28, and another casing 23. Rainwater is captured in casing 1, but even if a small amount of rainwater passes through casing 1, the bent casing 28 prevents further intrusion, thus more reliably preventing water from entering. Furthermore, as in Figure 7, a pressure fan 24 may be connected to the indoor side of the other casing 23. Other than the above, it is the same as the ventilation system, so the same reference numerals are used for the same components and detailed explanations are omitted.

[0038] Figure 9 shows a ventilation system according to another embodiment of the present invention. As shown in the figure, this ventilation system includes an outdoor hood 29 attached to the outer wall 4a of a building 4 so as to cover the vent 4b. The outdoor hood 29 has an outside air intake 30 at its bottom. Therefore, outside air is introduced from the outside air intake 30 at the bottom of the outdoor hood 29 and guided into the casing 101 through the vent 4b. Consequently, since rainwater is almost completely prevented from entering by the outdoor hood 29, a rainproof grille 2 as shown in Figure 1A may not be necessary. Therefore, in this embodiment, only a water drainage filter 3 is provided inside the casing 101. The casing 101 is cylindrical in shape, having an outdoor opening 101a and an indoor opening 101b, and its inner bottom surface 101d slopes downward toward the outdoors. Therefore, rainwater that hits the drain filter 3 falls onto the sloped inner bottom surface 101d and is discharged outside the building 4 via the outside air intake 30 of the outdoor hood 29. The drain filter 3 is positioned on the outdoor front surface of the partition plate 61, similar to the second partition plate 6 described above, and is pressed against the partition plate 61 by an eccentric cam mechanism. Since the drain filter 3 is the same as in the embodiment described above, it is given the same reference numerals and a detailed description is omitted.

[0039] Figure 10 shows a ventilation device according to another embodiment of the present invention. In the embodiments described above, shown in Figures 1A to 9, the internal bottom surfaces 1d and 101d of the cylindrical casings 1 and 101 were configured as inclined surfaces that sloped downward toward the outdoors. However, as shown in Figure 10 of this embodiment, the bottom 102d of the cylindrical casing 102 is almost horizontal, and an inclined section 103 for rainwater discharge, which slopes downward toward the outdoors, may be provided inside the cylindrical casing 102. The cylindrical casing 102 has an outdoor opening 102a and an indoor opening 102b at both ends, and the inclined section 103 is installed between them. Above the inclined section 103, a rainproof louver 2 and a water drain filter 3, similar to those in the embodiments described above, are arranged along the direction of airflow. The rest is the same as in the embodiments described above, so a detailed explanation is omitted.

[0040] Although embodiments of the present invention have been described above, the ventilation device of the present invention is not limited to the above embodiments, and various modifications and improvements are possible within the scope of the present invention. [Explanation of Symbols]

[0041] 1, 101, 102 Cylindrical casing 1a, 101a, 102a Outdoor side opening 1b, 101b, 102b Indoor side opening 1c Side opening 1d, 101d, 102d Internal bottom surface 2. Rainproof louvers 3. Drain filter 3a...bottom edge, 3b...top edge 31...Frame, 32...Drain filter body, 33...Opening, 34...Support 4 Buildings 4a Exterior wall 4b Ventilation opening 5, 105 First partition plate 5a aperture 6. Second partition plate 7a, 7b guide 8 Fixtures 9 feather board 9a Mounting plate 91 Main Unit 92 First return piece 93 Second return piece 10 Frame Bottom plate 10a Tabletop 10b Side plate 10c 11a First drain hole 11b Second drain hole 11c Third drain hole 12 handles 13 Gasket 15 Gap 16 Doors 17 Packing material 18 Cover material 19a, 19b opening 20 Bypass holes 21 Pre-filter 22 Medium- and high-performance filters 23 Casing 24 Pressure fan 25 Guide 26 Eccentric cam 27 Rotation axis 28. Bent casing 29 Outdoor Food 30. Outdoor air intake 40 Support member 41 Bearing member 61 Partition Plate 103 Slope

Claims

1. A cylindrical ventilation casing attached to a ventilation opening in the exterior wall of a building, A drain filter is placed inside the cylindrical casing, A ventilation system equipped with this.

2. The ventilation device according to claim 1, wherein the drain filter is arranged inside the cylindrical casing in a downward inclined manner such that its lower end is located on the indoor side of the upper end.

3. The ventilation device according to claim 2, wherein at least the inner bottom surface of the cylindrical casing from the vent of the outer wall to below the drain filter is an inclined surface that slopes downward from the indoor side to the outdoor side.

4. The ventilation device according to claim 1 or 2, further comprising a rainproof louver positioned between the vent of the exterior wall and the water drainage filter.

5. The ventilation device according to claim 1 or 2, further comprising a ventilation hood attached to the vent of the outer wall and having an outside air intake at its bottom.

6. A ventilation device according to claim 1 or 2, comprising a pressure fan.

7. The ventilation device according to claim 1 or 2, further comprising a salt damage filter on the indoor side of the aforementioned drainage filter.

8. The ventilation device according to claim 1 or 2, wherein another cylindrical casing is connected to the indoor side of the cylindrical casing, and the other cylindrical casing houses a pre-filter and a medium-high performance filter in order from the outdoor side.

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