JP2008275192A - Ventilation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilation device capable of adjusting an air volume without lowering static pressure with respect to the ventilation device having a decorative panel closing a front face of a suction opening of an axial-flow air blower. <P>SOLUTION: In this ventilation device disposed on a through hole 2 penetrating through a partitioning wall, provided with the axial-flow air blower 3 assembled in a main body frame 4 mounted on the through hole 2, and having a main suction opening 6 and a flange 7 constituting a planar part continuing to an outer periphery of the main suction opening 6, at an indoor side of an air channel 5, the flange 7 and a front face of the main suction opening 6 are covered by the decorative panel 12 provided with suction openings 15 in the four directions at prescribed intervals, and a roughly conical guide member 16 is disposed on a back face of the decorative panel 12 in a state of projecting roughly toward the center of the main suction opening 6. A partitioning plate 18 is disposed to radially partition an inclined part of the guide member 16 toward the suction openings 15 formed in the four directions, and a movable shutter 20 is disposed to open and close the suction opening 15 of at least one direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a ventilation device installed in a through hole that penetrates a partition wall that partitions the interior and the exterior.

  As a ventilator installed in a through-hole penetrating a partition wall that partitions the interior and the exterior, there are one that forms a ventilation flow with an axial blower and one that forms with a centrifugal blower. In the case of ventilation in a living room, the front surface of the suction port is covered with a panel grill in consideration of the interior design, and indoor air is sucked along the partition wall between the panel grill and the main body having the suction port. In this type of ventilator, turbulent flow is generated in the vicinity of the suction port and air blowing performance deteriorates.Therefore, a conical guide member is provided on the back of the panel grille, and the suction air flow is guided to the suction port by the inclined surface of the guide member. The flow is prevented (see Patent Document 1 and Patent Document 2).

Japanese Patent Laid-Open No. 4-324045 Japanese Utility Model Publication No.4-1349.

  Among these, ventilators composed of axial-flow fans are widely used because large air volumes are easily obtained. However, the axial flow type blower inherently has a low static pressure, and if the air flow is very small, the static pressure also decreases.For example, the outdoor wind resistance decreases, or the ventilation air flow changes due to a change in the indoor static pressure. Get up. Such a problem can be solved by providing a bell mouth having an inner diameter of about 70% of the outer diameter of the impeller so that the static pressure increases more than twice when the open air volume is the same. However, in the ventilating device of Patent Document 1, among the ventilation performances, good characteristics are exhibited from the open area to the middle air volume area, but the static pressure has a suction opening on the front surface from the middle air volume area to the fully closed area. Compared to a sudden drop. This phenomenon appears more prominently as the opening on the side surface becomes smaller, and is contrary to the desire to emphasize design and reduce the indoor projecting dimension. In addition, as a ventilation device for constant ventilation in a highly airtight and highly insulated house, there is a desire to ventilate with the air volume according to the room, but no ventilator that can adjust the air volume without causing a decrease in static pressure has been developed. .

  The present invention has been made to solve the above-described problems, and the problem is that an axial flow fan in a ventilation device installed in a through-hole that penetrates a partition wall that partitions the interior and the exterior of the axial flow is used. For a fan that has a decorative panel that closes the front of the main suction port of the air blower, even if the indoor projection size is reduced, it is possible to obtain the same blowing performance as that of the air blower having a suction opening on the front. An object of the present invention is to obtain a ventilation device that can adjust the air flow without causing a decrease in static pressure.

  In order to solve the above problems, the present invention is installed in a through hole penetrating a partition wall that partitions the outside of the room, and an axial blower is assembled to a wind tunnel of a main body frame mounted in the through hole. For a ventilator that has a main suction port that expands in the shape of a bell mouth and a flange that constitutes a flat portion that continues to the outer periphery of the main suction port, the flange and the front surface of the main suction port are arranged in four directions with the suction ports at predetermined intervals Cover with the decorative panel to be formed, and on the back surface of the decorative panel, a substantially conical guide member is provided so that the apex portion following the slope portion continuous from the back surface of the decorative panel protrudes toward the approximate center of the main suction port, A means is provided that includes a partition plate that radially divides the slope portion of the guide member toward the suction port that opens in four directions, and that includes a shutter that can open and close at least one suction port of the suction port that opens in the four directions.

  According to the present invention, the indoor air sucked in from the suction openings that are open in four directions is guided to the slope portion of the guide member with the suction direction being unified by the partition plate, and the main suction of the wind tunnel without generating turbulence Even if the interior projection of the decorative panel is reduced in size, the air blowing performance equivalent to that having a suction opening on the front surface of the axial blower can be obtained. By closing the suction port, the ventilation air volume can be adjusted without causing a decrease in static pressure.

  The present invention is a ventilation device that is installed in a through-hole that penetrates a partition wall that partitions the interior and the exterior, and that has an axial-flow fan installed in a wind tunnel of a main body frame that is mounted in the through-hole. On the indoor side of the wind tunnel, there is a main suction port that expands in the shape of a bell mouth, and a flange that forms a flat portion that continues to the outer periphery of the main suction port. The front surfaces of the flange and the main suction port are covered with a decorative panel facing the flange at a predetermined interval. The peripheral side portion of the decorative panel is open to the room as a suction port that opens in four directions for taking in indoor air. A substantially conical guide member made of a three-dimensional porous synthetic resin is provided on the back of the decorative panel so that the apex part that continues from the back of the decorative panel to the inclined surface protrudes toward the approximate center of the main suction port. Is provided. The guide member is provided with a partition plate that divides the slope portion into four portions radially toward a suction port that opens in four directions. The height dimension of the partition plate is configured to be about 1/2 or more than the axial dimension of the suction port, and the height is lower than the apex portion of the guide member. A movable shutter capable of opening and closing the suction port in at least one direction (which may be in two to four directions) of the suction port that opens in four directions is provided.

  In this ventilator, in a state where the movable shutter is opened and all the suction ports are opened, room air is introduced into the suction ports that are opened in four directions from various directions. The introduced air is equally divided into four directions (upper surface, lower surface, left side surface, right side surface) by the partition plate, and the suction direction is unified and guided to the inclined surface portion of the guide member, so that the wind tunnel without generating turbulent flow The main suction port is made uniform and sucked. Thereby, even if it reduces the protrusion dimension of the interior side of a decoration panel, the ventilation performance equivalent to what has a suction opening in the front surface of an axial flow type air blower can be obtained.

  If you want to reduce the ventilation airflow a little, close one of the suction openings that opens in four directions with a movable shutter. To further reduce the ventilation air volume, close the two suction ports that open in four directions with a movable shutter. Thereby, indoor air is introduced into the suction port which is not closed. The introduced air is equally divided into three or two directions by the partition plate, and the suction direction is unified and guided to the slope portion of the guide member, and is uniformized to the main suction port of the wind tunnel without generating turbulent flow. And sucked. This makes it possible to adjust the ventilation air volume without causing a decrease in static pressure, and as a ventilation device that performs constant ventilation, it is convenient to adjust the ventilation air volume according to the size of the room and the application.

Embodiment 1 FIG.
1 is a longitudinal sectional view showing the ventilator of the present embodiment in an attached state, FIG. 2 is an exploded perspective view of the ventilator, FIG. 3 is an exploded perspective view showing a decorative panel, and FIG. 4 is a decorative panel. FIG. 5 is a perspective view showing the flow of air sucked into the suction port when the movable shutter is fully opened, and FIG. FIG. 7 is an explanatory diagram showing the air blowing performance by the influence of the size of the suction port, and FIGS. 8 and 9 are explanatory diagrams showing a noise value comparison with respect to the open air volume ratio and the effective ventilation volume ratio. is there.

  As shown in FIG. 1, the ventilator according to the present embodiment is installed in a through hole 2 constituted by a pipe, a duct, or the like that penetrates a partition wall (wall body) 1 that partitions the interior and the exterior. 3 is a ventilation device that is assembled to the wind tunnel 5 of the main body frame 4 that is inserted into the through hole 2. On the indoor side of the wind tunnel 5, there are a main suction port 6 that expands in a bell mouth shape, and a flange 7 that forms a planar portion that continues to the outer periphery of the main suction port 6. Several mounting legs 8 extend along the center line on the outdoor side of the wind tunnel 5, and a motor cover 9 is formed integrally with the legs extending from the end of the mounting legs 8 toward the center. The motor cover 9 encloses the outer wall of the motor 10 of the axial-flow blower 3 on the rotating shaft side, and the motor 10 is screwed on the legs so that the rotating shaft protrudes from the motor cover 9 onto the center line of the wind tunnel 5. . An impeller 11 that rotates in the wind tunnel 5 is attached to a rotation shaft that protrudes into the wind tunnel 5.

  The front surface of the flange 7 and the main suction port 6 of the wind tunnel 5 is covered with a square (or round) decorative panel 12 facing the flange 7 at a predetermined interval. The decorative panel 12 is attached to the ends of four legs 14 provided at the four corners of a frame-like panel frame 13 fitted and attached to the outside of the flange 7 of the wind tunnel 5 (FIG. 3). reference). The peripheral side portion of the decorative panel 12 is opened to the room along the partition wall as a suction port 15 for taking in indoor air from four directions. A substantially hollow conical guide member 16 made of a three-dimensional porous synthetic resin is provided on the back surface of the decorative panel 12, and an apex portion 17 that extends from the inclined surface continuous from the back surface of the decorative panel 12 is the main suction port 6 of the wind tunnel 5. It is provided so as to protrude substantially toward the center. The guide member 16 is provided with a partition plate 18 that divides the slope portion into four in a radial (straight) manner on the diagonal of the leg portion 14. The height dimension of the partition plate 18 is configured to be about 1/2 or larger than the axial dimension of the suction port 15, and the height is equal to or lower than the apex portion 17 of the guide member 16. The decorative panel 12 itself has a thin box shape whose outer peripheral portion is formed into a flange shape on the back side, and a guide partition member 19 having a black color tone in which a guide member 16 and a partition plate 18 are integrally formed is mounted on the back surface. Yes. The outer portion of the guide partition member 19 is formed slightly smaller than the outer dimension of the decorative panel 12, and the flange-shaped space on the back surface of the decorative panel 12 is made smaller.

  The guide partition member 19 is provided with a movable shutter 20 that can open and close each suction port 15 that opens in four directions. Each movable shutter 20 has a configuration in which a rotation shaft 22 is provided on a blade 21, and is provided between the four leg portions 14 so as to be rotatable. A shaft support portion 23 that supports the rotation shaft 22 is formed in the guide partition member 19, and the blade 21 can be rotated from a state in which the suction port 15 is closed to a state in which it is closed. The rotation shaft 22 and the shaft support portion 23 can be rotated so as to be held in position by an engagement structure with a notch, and the blade 21 can be held at the intermediate opening position. The fully closed blade 21 is in close contact with the flat portion of the guide partition member 19 and does not obstruct the flow of the airflow sucked from the suction port 15. Further, at the intermediate opening position, the blade 21 has an inclination of approximately 45 degrees with respect to a horizontal plane or a vertical plane, and can smoothly guide the airflow to the main suction port 6. When the lower suction port 15 is closed by the lower movable shutter 20, the inside of the decorative panel 12 becomes invisible to the user, and dust adhering around the main suction port 6 also falls on the blade 21. Moreover, since the fall into a room is prevented, usability is also improved. The movable shutter 20 may be configured as a slide type so that the suction port 15 can be fully closed or fully opened.

  In this ventilator, indoor air is introduced from various directions into the side and upper suction ports 15 in a state where each movable shutter 20 is fully opened and all the suction ports 15 in the four directions are opened. The introduced air is equally divided into four directions (upper side, lower side, left side, right side) by the partition plate 18 of the guide partition member 19, and the suction direction is unified and guided to the slope portion of the guide member 16 for turbulent flow. Without being generated, the air is uniformly sucked into the main suction port 6 of the wind tunnel 5. Thereby, even if the protrusion size of the interior side of the decorative panel 12 is reduced, it is possible to obtain a blowing performance equivalent to that having the suction opening on the front surface of the axial flow fan 3. The guide partition member 19 has a black color tone including the movable shutter 20, and dust adhesion is not noticeable. Further, the main suction port 6 of the wind tunnel 5 is not easily seen by being obstructed by the guide partition member 19 from the suction port 15, and does not impair the indoor atmosphere as compared with the one in which the main suction port 6 is directly visible. Also for cleaning, the partition plate 18 is a flat plate and can be easily cleaned from the suction port 15.

  When it is desired to suppress the ventilation air flow a little, some of the suction ports 15 that open in four directions are closed by the movable shutter 20 or set to an intermediate opening degree. Thereby, indoor air is introduce | transduced into the suction inlet 15 which is not closed, and the suction inlet 15 made into the intermediate opening degree. The introduced air is divided into two directions or one direction by the partition plate 18, the suction direction is unified and guided to the slope portion of the guide member 16, and is uniform in the main suction port 6 of the wind tunnel 5 without generating turbulent flow. And sucked. As a result, the ventilation air volume can be adjusted with almost no decrease in static pressure, and the convenience of being able to adjust the ventilation air volume according to the size of the room and the use as a single ventilation device as a constant ventilation device is improved.

  The ventilation performance of this ventilator is shown in FIG. 6 in comparison with a grill grille and decorative panel with or without a guide partition member. The motor 10 of the axial-flow type blower 3 is a condenser run motor and has a very low power consumption of about 2 W. Its outer diameter portion is very small, with a diameter of 44 mm, and the flange portion with a maximum diameter of 48 mm. The outer diameter dimension of the motor cover 9 is set to φ48 mm so as to substantially coincide with the maximum diameter of the flange portion of the motor 10. The inside diameter of a general PVC duct (pipe passing through the partition wall 1) is φ107 mm for VU100 and φ100 mm for VP100, but one that is slightly smaller than this is VU75 and inside diameter φ83 mm. The main dimensions of the ventilation device that can be attached to this are as follows. The outside diameter of the wind tunnel 5 is about 78 mm including motor lead processing, the inside diameter is about 73 mm, the outside diameter of the impeller 11 is about 68 mm, the axial dimension of the impeller 11 is about 30 mm, and the roundness of the bell mouth is R8. The intrusion dimension from the flat part of the bell mouth to the outer end of the impeller 11 is about 4 mm. In order to eliminate the influence of the power of the motor 10 in the following description, the rotational speed is a constant air flow performance of 2500 / min.

The axial dimension of the suction port 15 is 22 mm, and the height dimension of the partition plate 18 is 15 mm (see A in FIG. 1). The dimension of the decorative panel 12 in the axial direction is 6 mm, and the space portion of the flange-shaped portion on the back surface thereof is 4 mm. In FIG. 6, the symbol-indicates a structure having only the main body frame 4 in FIG. The symbol ◯ is a grid grille having a large opening on the front surface, the grid width is 2.5 mm, and the grid spacing is 4.5 mm. Compared to the characteristics without the grill, the characteristics with the grid grille have a large opening in the front part, so the air is sucked from the entire suction part of the axial blower 3 and the air is not biased. The air blowing performance for the portion of pressure loss is deteriorated. Although the noise value rises by about 3 dB due to the influence of the lattice grill, the deterioration of the blowing performance is a state where a pressure loss equivalent to the duct 10 m, which is a normal piping state, is applied, that is, between the blowing performance curve and the duct resistance curve. The installation air volume at the intersection is about 3% lower, and the total closing pressure (deadline static pressure) is almost unchanged. For this reason, outside wind is applied (for example, about 5 m / s of outside wind is applied) Even in a state where about 15 Pa as an extra static pressure is applied from the duct 10 m or more, even with a single characteristic without a grid grill, a grid grill is provided. Even in this case, ventilation of about 10 m ³ / h is possible.

Next, the symbol ◇ is a ventilation device only with the decorative panel 12 on the front side and without the guide partition member 19, and the air blowing performance is much lower from the open area to the medium air volume area than the state where the lattice grill is attached. Not done. For this reason, the installed state air volume applied by about 10 m of the duct is about 10% lower, and only about 12% lower than the state without the grill. However, in the middle air volume range (area where the air volume is about 20 to 10 m ³ / h) to the fully closed area (area where the air volume is about 0 to ⁵ m ³ / h), the air blowing performance is greatly reduced compared to the case with the lattice grill. In the closed region, it becomes about 1/3. This is because the wind flow in the central portion of the impeller 11 is mainly disturbed in the fully closed region because only the front decorative panel 12 is used. For this reason, outside wind is applied (for example, about 5 m / s of outside wind is applied). In a state where about 15 Pa is applied as the static pressure in excess of the duct 10 m, the static pressure with the highest blowing performance is only 8 Pa. For this reason, the outside wind enters the room because the power of the outside wind exceeds the ventilation capacity of the ventilation device. In the state where the outside wind is reduced to about 3.7 m / s and about 8.2 Pa is applied as the static pressure more than the duct equivalent to 10 m, the static pressure with the highest blowing performance is only 8 Pa. Ventilation capacity and outdoor wind force become equal, and it becomes very unstable, and the outdoor wind enters the room and repeats a slight ventilation.

  Next, the case of the ventilator of this embodiment indicated by the symbol ◆ will be described. The height A of the partition plate 18 is 12 mm. Compared with the case where only the decorative panel 12 is attached to the front surface, the air blowing performance from the open area to the medium air volume area is almost the same as that of the ventilator without the guide partition member 19 described above. The noise level was also similar. The air flow performance is greatly improved from the middle air volume range to the fully closed area, and compared to the case with the lattice grill, the total closing pressure is about twice as large as that of the decorative panel 12 alone. Wind resistance is greatly improved.

  When the height dimension A of the partition plate 18 is less than ½ of the axial dimension 22 mm of the suction port 15, improvement in the air blowing performance from the medium air volume range to the fully closed range cannot be expected so much, but it can be ½ or more. In other words, if A = 12 mm, the total closing pressure is about halfway between the case with the grid grille and the decoration panel 12 alone, and if A = 15 mm, 22 mm, the total closing pressure gradually increases. When A = 22 mm, it is almost the same as the case with the lattice grill. When considered comprehensively, it is effective that the height dimension of the partition plate 18 is at least 1/2 of the axial dimension of the suction port 15.

Next, the function of adjusting the ventilation air volume will be described. As a result of the revision of the Building Standards Law, it is mandatory to install ventilation facilities, and ventilation is required 24 hours (always) even in living rooms. The ventilation air volume varies depending on the size of the room, and the ventilation frequency is about 0.5 times / h. For example, in a 6 tatami room, the volume of the room is about 25 m ³ when the height of the room is 2.5 m. In this case, the necessary ventilation air volume when the ventilation frequency is 0.5 times / h is 12.5 m ³ / h. Similarly, when the room size is 8 tatami, it is 16.5 m ³ / h, 10 tatami is 20.6 m ³ / h, and 12 tatami is 25 m ³ / h.

  FIG. 7 shows the blowing performance when the size of the suction port 15 is changed. Moreover, the pressure loss characteristic equivalent to duct 10m is also described. This pressure loss characteristic is almost equivalent to the pressure loss of an outdoor hood. That is, the intersection of the ventilation performance and the pressure loss characteristic is the effective ventilation amount when the ventilation device is actually installed on the partition wall and combined with the outdoor hood. In FIG. 7, the symbol-indicates a structure having only the main body frame 4 in FIG. 2 without a grill, and is the same as in the case of FIG. The symbol ■ indicates the case where the above-mentioned decorative panel is provided and the partition plate 18 is 22 mm, and nothing is provided in the suction port 15, and is the same as FIG. 6. Symbol ● indicates a case where only the lower side of the four-way suction ports 15 is closed. That is, the area of the suction port 15 is 3/4. In this case, the open air volume is reduced by only 8% compared to the case where nothing is provided at the suction port 15, but the effective ventilation volume, that is, the ventilation air volume when combined with an outdoor hood is reduced by 15%.

  The symbol ◆ indicates a case where the lower side and the upper side of the four-way suction ports 15 are closed. That is, the area of the suction port 15 is ½. In this case, the open air volume is reduced by 40% and the effective ventilation volume is reduced by 37% compared to the case where nothing is provided at the suction port 15. Symbol □ indicates a case where the lower suction port 15 is closed, and the upper suction port 15 is closed half with the movable shutter 20 being set to an intermediate opening. The symbol ▲ is when the lower and upper sides and one side of the suction port 15 are closed. That is, the area of the suction port 15 is 1/4. In this case, the open air volume is reduced by 53% and the effective ventilation volume is reduced by 43% as compared with the case where nothing is provided at the suction port 15. Symbol ◇ indicates a case where the lower side and the upper side of the suction ports 15 in the four directions are closed, and the movable shutter 20 is set to an intermediate opening degree and the half is closed on the left and right sides. That is, the area of the suction port 15 is 1/4. In this case, the open air volume is reduced by 65% and the effective ventilation volume is reduced by 55% as compared with the case where nothing is provided in the suction port 15. As described above, as the area of the suction port 15 that is blocked decreases, the open air volume and the effective ventilation volume decrease, but the total closing pressure changes almost equally.

When the size of the room is 16 tatami mats, for example, the lower suction port 15 is closed and used. In ventilator only with inlet in the four directions, the effective ventilation is ^{30 m} 3 / h, and becomes 20% more than ^{25 m} 3 / h of required ventilation. In the ventilator of the present embodiment, when the lower suction port 15 is closed and used, the effective ventilation amount is 25.5 m ³ / h, and no extra ventilation is provided. When used as a ventilator with an application range up to 16 tatami mats, the lower suction port 15 may not be opened and may be a fixed shutter. When the room size is 8 tatami mats, for example, as shown by the symbol ▲, the lower and upper sides and one side of the suction port 15 are closed and used, and the required ventilation amount is 16.5 m ³ / h. On the other hand, what is necessary is just to drive | operate by effective ventilation amount 17m < ³ > / h.

  The noise value when the ventilation air volume is adjusted will be described. In the case of changing the height of the partition plate 18 described above, the noise value does not change so much, but in this case, the noise value increases as the air volume decreases. 8 and 9 are explanatory diagrams showing comparison of noise values with respect to the open air volume ratio and the effective ventilation volume ratio, and the operation rotational speed is constant at 2500 / min. FIG. 8 shows the open air volume ratio on the horizontal axis and the noise value (when open) on the vertical axis. An open air volume ratio of 1.0 is a case where there is no air volume adjustment function. As the open air flow ratio decreases, that is, as the area of the suction port 15 decreases, the noise value increases almost linearly. When the air volume is adjusted most strongly, it rises by about 4 dB compared to the case without air volume adjustment, but the absolute value is very low, about 25 dB. Thus, since the effective ventilation amount can be adjusted with respect to the size of the room, there is no need to select a model depending on the size of the room, for example, in this type of ventilation device. FIG. 9 shows the effective ventilation rate ratio on the horizontal axis and the noise value (when open) on the vertical axis. Further, since the air volume is not adjusted by changing the motor power, there is no reduction in consumption due to a reduction in the air volume, but there is no problem because the original power consumption is as low as about 2 W. Furthermore, since the motor power is not changed even when the air volume is adjusted, the air blowing performance in the fully closed region does not deteriorate, and the outside wind resistance increases.

The longitudinal cross-sectional view which shows a ventilation apparatus in an attachment state. (Embodiment 1) It is a disassembled perspective view of a ventilation apparatus. (Embodiment 1) It is a disassembled perspective view of the front view which shows a decoration panel. (Embodiment 1) It is a disassembled perspective view of the back view which shows a decoration panel. (Embodiment 1) It is a perspective view which shows the flow of the suction air to the suction inlet at the time of a movable shutter fully open. (Embodiment 1) It is explanatory drawing which shows the influence of the height of a partition plate by comparing ventilation performance with another ventilation apparatus. (Embodiment 1) It is explanatory drawing which shows ventilation performance by the influence of the magnitude | size of a suction inlet. (Embodiment 1) It is explanatory drawing which shows the noise value comparison with respect to an open air volume ratio and an effective ventilation volume ratio. (Embodiment 1) It is explanatory drawing which shows the noise value comparison with respect to an open air volume ratio and an effective ventilation volume ratio. (Embodiment 1)

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Partition, 2 Through-hole, 3 Axial flow type fan, 4 Main body frame, 5 Wind tunnel, 6 Main suction inlet, 7 Flange, 12 Decoration panel, 14 Leg part, 15 Suction inlet, 16 Guide member, 17 Vertex part, 18 Partition Plate, 19 guide partition member, 20 movable shutter.

Claims (4)

  Installed in a through-hole penetrating a partition partitioning the interior and exterior, an axial flow fan is assembled in the wind tunnel of the main body frame mounted in the through-hole, and the main suction that expands in a bell mouth shape on the indoor side of the wind tunnel A ventilating apparatus having a flange and a flange constituting a flat portion following the outer periphery of the main suction port, wherein the flange and the front surface of the main suction port are formed in four directions with suction ports at predetermined intervals. In the back of the decorative panel, a substantially conical guide member is provided so that the apex portion following the slope portion continuous from the back of the decorative panel protrudes toward the approximate center of the main suction port. Ventilation equipped with a partition plate that divides the slope portion of the guide member radially toward the suction port that opens in four directions, and a shutter that can open and close the suction port in at least one direction of the suction port that opens in four directions apparatus   The ventilator according to claim 1, wherein the shutter is configured to be rotatable so as to be able to hold a position between the closing and opening of the suction port.   3. The ventilation apparatus according to claim 1, wherein the decorative panel is a thin box shape having a flange shape projecting to the back side on the outer peripheral portion, and a guide member and a partition plate are integrally formed on the back surface. A ventilation apparatus in which a guide partition member whose outer shape is slightly smaller than the outer dimension of the decorative panel is mounted, and a shutter is provided on the guide partition member.   The ventilator according to any one of claims 2 and 3, wherein the ventilator includes all of the suction ports that open the shutter in four directions.

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