JP7407344B2 - ventilation system - Google Patents

Description

The present invention relates to a ventilation system including an air supply hood device and a filter section.

Conventional ventilation systems have had the problem that dust contained in the air supply flow enters the filter, clogging the filter and making it impossible to secure the necessary air supply flow rate.

In the prior art, the shape and composition of the filter were devised (Prior Document 1), and a charging device was installed to charge the pre-filter to improve the collection performance (Prior Document 2). These issues included increased costs, and increased complexity and larger ventilation systems.

JP 2019-42703 Publication Japanese Patent Application Publication No. 2016-64409

Therefore, the present invention solves the above-mentioned conventional problems, and extends the life of the filter by suppressing clogging of the filter while suppressing the increase in cost of components related to the ventilation system and the complexity and enlargement of the ventilation system. The purpose is to realize the following.

In order to achieve this objective, the ventilation system according to the present invention includes an air supply hood device that is disposed at one end of the air supply path and generates a swirling airflow with respect to the air supply flow, and a ventilation system that is located downstream of the air supply hood device. and a ventilation device located downstream of the air supply hood device and blowing air from upstream to downstream , the air supply hood device being connected to the ventilation device via a duct. , a separation section that separates a plurality of foreign objects contained in the supply air flow by the swirling airflow into first foreign objects that are transported to the filter section and second foreign objects that are not transported to the filter section ; , has a truncated conical shape in which the diameter of the downstream bottom is larger than the diameter of the upstream bottom, and the ratio of the distance between the upstream bottom and the downstream bottom to the diameter of the downstream bottom is 0.36 or more The ratio of the diameter of the downstream bottom to the diameter of the duct is 1.4 or more and 1.7 or less, and the average wind speed of the swirling airflow is 1.7 m/sec or more and 3.5 m/sec or less. , the filter section includes an upstream section provided on the upstream side, and a deposition section that deposits the first foreign matter conveyed from the air supply hood device on the downstream side of the upstream side. , thereby achieving the intended purpose.

According to the present invention, by adsorbing dust contained in the air supply flow to the first foreign matter deposited on the accumulation section, it is possible to suppress adhesion of dust to the filter section, thereby extending the life of the filter section. This makes it possible to achieve the effect of extending the maintenance cycle of the filter section.

Schematic diagram showing a ventilation system according to Embodiment 1 of the present invention A perspective view of the air supply hood device according to the first embodiment A side sectional view of a discharge section provided in the air supply hood device according to the first embodiment. A side sectional view showing the internal configuration of the air supply hood device according to the first embodiment A side sectional view showing the internal configuration of the air supply hood device according to the first embodiment (a) Perspective view of the filter section according to the first embodiment, (b) Side sectional view of the filter section according to the first embodiment A schematic diagram showing a porous layer formed by the first foreign matter deposited in the troughs of the filter part and the flow of air supply according to the first embodiment. Experimental graph showing the relationship between the number of days of use and pressure loss of the filter according to the first embodiment

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
An outline of a configuration in which an air supply hood device 1 and a filter section 2 according to a ventilation system of the present invention are attached to a member for ventilation of a house will be explained using FIG. 1.

As a ventilation device for ventilation of a house, the air supply device 3 includes a case 4, an outside air intake port 5 that takes in outside air, an indoor air outlet 6 that blows out the taken outside air into the room, a filter part 2, and an air supply blower. 7.

The outside air intake port 5 is an opening provided on one side of the case 4. The indoor air outlet 6 is an opening provided on a side surface opposite to the side surface on which the outside air intake port 5 is provided.

The case 4 includes a filter section 2 and a supply air blower 7, and the filter section 2 is arranged at a position closer to the outside air intake port 5 than the supply air blower 7.

The air supply blower 7 includes a motor and a fan connected to the shaft of the motor. The motor and fan are not shown. Any type of fan can be selected, such as an axial fan or a centrifugal fan. The type of motor can be selected from any type, such as an AC type or a DC type.

One end of a duct 8 is connected to the outside air intake 5, and the other end of the duct 8 is connected to an outer wall 9, which is assumed to be a part of the outer wall of a house. The outer wall 9 is provided with an opening (not shown) to communicate with the outside.

The air supply hood device 1 is connected to the outer wall 9 so as to cover an opening (not shown) in the outer wall 9.

The above is an outline of the configuration in which the air supply hood device 1 and the filter section 2 are attached to a member for ventilation of a house.

Next, the external configuration of the air supply hood device 1 will be described using FIG. 2.

The air supply hood device 1 has a hexahedral shape and includes a cover portion 10 and a base portion 11.

The cover portion 10 is connected to the base portion 11 and forms the outer shell of the air supply hood device 1 .

The cover part 10 is a square box body composed of a square front plate 12 and rectangular side plates 13 extending perpendicularly from each side of the front plate 12. Although the front plate 12 of the first embodiment has a planar shape, it may have a dome shape with a protruding central portion.

The base portion 11 has substantially the same square shape as the front plate 12.

The side plate 13 is provided with an air supply inlet 14 which is a rectangular opening. The air supply inlet 14 is arranged at a position closer to the base portion 11 than the center of the side plate 13 in the long side direction.

The space formed by the cover part 10 and the base part 11 includes a rectifying plate 15 as a swirling flow generating means for swirling the incoming air.

The plurality of rectifier plates 15 are annularly arranged at equal intervals with respect to a central axis 16 extending vertically from the approximate center of the front plate 12, and are connected to the cover part 10 and the base part 11. In order to prevent large insects and birds from entering the air supply hood device 1, the air supply inlet 14 and the current plate 15 may be provided with a net.

The base portion 11 is a tubular body substantially concentric with the central axis 16, and an air supply outlet 17 is connected to the base portion 11 by a rivet or screw (not shown).

One of the side plates 13 is provided with a discharge portion 18 protruding from the side plate 13.

The discharge section 18 includes a discharge promoting surface 19 having an inclined inner and outer surface, a discharge side surface 20 extending substantially perpendicularly from the side plate 13 , and a discharge bottom surface 21 substantially parallel to the side plate 13 .

The discharge bottom surface 21 is provided with a rectangular discharge port 22.

The configuration of the discharge section 18 will be described in detail later.

The above is the external configuration of the air supply hood device 1.

Next, details of the configuration of the discharge section 18 will be explained using FIG. 3. FIG. 3 is an enlarged sectional view of the vicinity of the discharge section 18, taken along a plane parallel to the front plate 12.

The discharge promoting surface 19 is arranged approximately symmetrically with respect to the central axis 23.

The discharge promoting surface 19, the discharge side surface 20, and the discharge bottom surface 21 are integrally formed, and the discharge port 22 is always open.

The discharge promoting surface 19 is inclined so that the opening cross-sectional area becomes smaller toward the discharge port 22.

The exhaust port 22 is provided on the exhaust bottom surface 21 so as to communicate the inside and outside of the air supply hood device 1 .

The detailed configuration of the discharge section 18 has been described above.

Next, the internal configuration of the air supply hood device 1 will be described using FIGS. 4 and 5.

FIG. 4 is a side sectional view of the air supply hood device 1 taken along the central axis 16.

The space formed by the cover part 10 and the base part 11 includes an inner cylindrical pipe 24 and a separation part 25 in addition to the above-mentioned baffle plate 15.

The separation section 25 includes a swirling chamber 26 and a separation chamber 27.

The swirling chamber 26 has a truncated conical shape formed by a space dividing plate 31, and has a relationship in which the inner diameter D2 of the downstream bottom portion 29 is larger than the inner diameter D1 of the upstream bottom portion 28 (D1<D2). A through hole 30 is provided in the side surface of the swirling chamber 26 and communicates with the separation chamber 27 .

The separation chamber 27 is a space made up of the cover part 10 and the space dividing plate 31, and the details will be described later.

The current plate 15 and the inner cylindrical tube 24 are arranged substantially concentrically with respect to the central axis 16, and the current plate 15 is arranged outside the inner cylindrical tube 24.

The inner cylindrical tube 24 is a tube connected to the air supply outlet 17 by a screw (not shown), and the inner cylindrical tube 24 and the air supply outlet 17 are arranged substantially concentrically and communicate with each other.

The end 24a of the inner cylindrical pipe 24 is located closer to the upstream bottom than the downstream bottom 29. In other words, the end portion 24a is located closer to the upstream bottom portion 28 than the air supply inlet 14.

In this embodiment, the inner diameter D4 of the inner tube 24 is smaller than the inner diameter D3 of the air supply outlet 17 (D3<D4), but they may have the same dimension (D3=D4).

FIG. 5 is a side sectional view taken along a plane parallel to the front plate 12 at a position containing the separation chamber 27. FIG. First, the separation chamber 27 will be explained in detail.

The separation chamber 27 is an annular space spanning four quadrants on a coordinate plane expressed using the X-axis and the Y-axis.

The through hole 30 is located in the second quadrant of the coordinate plane, and the separation chamber 27 includes a separation chamber bottom surface 37 consisting of a curved surface 37a and a curved surface 37b along the space dividing plate 31 in the third and fourth quadrants. The separation chamber 27 is connected to the inner walls of the front plate 12 and side plate 13. That is, the separation chamber 27 includes the front plate 12 , the side plate 13 , and the separation chamber bottom surface 37 . The separation chamber 27 is in communication with the discharge port 22.

Next, an inflow airflow control plate 32 extending from the inner wall of the front plate 12 toward the space dividing plate 31 is arranged in the separation chamber 27 . The inflow airflow control plate 32 is arranged above the discharge port 22 so as to be inclined upward from the third quadrant to the fourth quadrant.

The inflow airflow control plate 32 includes an end portion 32a and an end portion 32b. A gap is provided in the space between the space dividing plate 31 and the end portion 32a, and in the space between the space dividing plate 31 and the end portion 32b.

Next, the filter section 2 will be explained using FIG. 6. FIG. 6(a) is a perspective view of the filter section 2, and FIG. 6(b) is a partial cross-sectional view of the filter section 2 cut out along the XY axis plane and the YZ axis plane.

The filter section 2 includes a filter medium 33 and a frame section 34.

The filter medium 33 is continuous at an angle θ formed by a top portion 35 and a valley portion 36 as a deposited portion, and has a pleated shape with a total length L2, width W1, and height H1. The distance (pitch) between the top portions 35 and the adjacent top portions 35 is P. Once the values of W1 and L2 are determined and the value of either P or θ is determined, the value of the other can also be uniquely determined.

The frame portion 34 is a rectangular frame body having a total length L, a width W2, and a height H2, and has a thickness T and is open in the Y-axis direction.

The frame portion 34 frames the filter medium 33 and is connected to the filter medium 33 using an adhesive or the like.

Next, a mechanism for separating airflow and foreign matter in the above configuration will be explained.

When the air supply blower 7 starts operating, the air supply device 3 generates an airflow from the outside air intake port 5 toward the indoor air outlet 6.

Since the inside of the air supply hood device 1 has a negative pressure, outdoor air containing foreign matter flows into the interior of the air supply hood device 1 through the air supply inlet 14, as shown by outdoor air flow A in FIG.

As shown in outdoor airflow B in FIG. 4, the outdoor air becomes a swirling airflow by passing through the rectifier plate 15, and the end portion 24a is located closer to the upstream bottom portion 28 than the air supply inlet 14. Therefore, it turns in the turning chamber 26 while heading toward the upstream bottom part 28. Further, since the inner diameter D2 of the downstream bottom portion 29 is larger than the inner diameter D1 of the upstream bottom portion 28 (D1<D2), a swirling airflow can be efficiently generated in the swirling chamber 26. Here, the foreign matter moves to the space dividing plate 31 by centrifugal force, and is conveyed to the separation chamber 27 when passing through the through hole 30. The air from which the foreign matter has been separated flows into the inner cylinder pipe 24 as shown in outdoor air flow C in Fig. 4, and gradually changes from swirling air flow to laminar flow until it passes through the air supply outlet 17, duct 8, and outside air intake. 5. The air moves in the order of indoor air outlet 6 and is supplied indoors. In other words, outdoor air passes through an air supply route constituted by the air supply hood device 1, the duct 8, and the air supply device 3, and is shared indoors as a supply air flow.

Here, among the foreign substances contained in the outdoor air, the foreign substances that are not conveyed to the separation chamber 27 by the action of the separation unit 25 are defined as first foreign substances, and the foreign substances that are conveyed to the separation chamber 27 are defined as second foreign substances. In other words, the first foreign matter is a foreign matter that is still contained in the outdoor air even in the flow path beyond the inner cylindrical pipe 24. The first foreign matter accumulates on the filter medium 33 of the filter section 2 arranged in the air supply path. The influence of the first foreign matter on the filter section 2 and the air supply flow will be described later. First, let's discuss the second foreign object in detail.

The second foreign matter transported to the separation chamber 27 is temporarily stored in the separation chamber 27.

Due to the influence of the swirling airflow in the swirling chamber 26, the air in the separation chamber 27 becomes a swirling airflow in the same direction as the swirling chamber 26, as shown in outdoor airflow D in FIG. direction). Therefore, the second foreign matter stored in the separation chamber 27 also moves under the influence of the flow.

Since the separation chamber bottom surface 37 slopes downward toward the discharge port 22, the second foreign matter transported by the swirling airflow flows into the discharge portion 18 due to the slope of the separation chamber bottom surface 37. In the discharge section 18, the discharge promotion surface 19 is arranged substantially symmetrically with respect to the central axis 23, so that the second foreign matter can be easily collected.

The separation chamber bottom surface 37 can smoothly guide the second foreign matter to the discharge section 18 due to the curved surfaces 37a and 37b.

Further, the discharge port 22 has a rectangular shape with a length in the direction of the central axis 16, and the swirling airflow flowing through the separation chamber 27 crosses the discharge port 22, and the second foreign matter that has moved is transferred to the discharge port 22. It is becoming easier to flow into Note that the length of the discharge port 22 in the direction of the central axis 16 may be approximately equal to the length (thickness) of the separation chamber 27 in the direction of the central axis 16.

When natural wind blows outside the air supply hood device 1, the second foreign matter that has flowed into the discharge section 18 in this manner is drawn out of the separation chamber 27 by the natural wind. To explain in more detail, natural wind (crosswind) may blow near the discharge section 18 outside the air supply hood device 1 . The natural wind changes direction along the slope of the discharge promotion surface 19 and becomes a downward airflow. In particular, in the first embodiment, the surface shape is such that the slope gradually becomes steeper, like an upside-down Mt. Fuji, so that the natural wind that collides with the discharge promoting surface 19 can change direction smoothly. The second foreign matter present near the exhaust port 22 is drawn out of the air supply hood device 1 by being attracted by this airflow. In other words, the second foreign matter temporarily stored in the separation chamber 27 is discharged to the outside of the air supply hood device 1 every time the natural wind blows. becomes unnecessary.

Now, as mentioned earlier, since the interior of the air supply hood device 1 is under negative pressure due to the air supply blower 7, outdoor air is not only supplied from the air supply inlet 14 but also from the outlet 22 into the separation chamber. Trying to flow into the inside of 27.

Air flowing into the separation chamber 27 from the discharge port 22 flows in the Y-axis direction in FIG.

In the separation chamber 27, there is an airflow flowing through the through hole 30, and the air flowing into the separation chamber 27 from the outlet 22 becomes part of this airflow.

The air flowing in from such an exhaust port 22 may stir up the second foreign matter temporarily stored in the separation chamber 27, and may cause a re-scattering phenomenon in which it passes through the through hole 30 and scatters downstream from the inner cylinder pipe 24. .

However, by providing the inflow airflow control plate 32 having an inclination so as to cover the upper part of the discharge port 22, the airflow flowing in from the discharge port 22 is made to collide with the inflow airflow control plate 32, and the airflow is directed away from the through hole 30. can be directed towards The foreign matter that flies up at this time can be directed to the right side of the Y axis in FIG. 5 (that is, to the fourth quadrant side). In other words, the floating foreign matter can be kept away from the through-hole 30, thereby reducing the re-inflow of the foreign matter into the through-hole 30, suppressing the re-scattering phenomenon, and thus suppressing the deterioration of separation performance.

Next, the mechanism by which the first foreign matter accumulates on the filter medium 33 and the influence of the first foreign matter on the air supply flow and the dust contained in the air supply flow will be explained using FIG. FIG. 7 is an enlarged cross-sectional view of the filter medium 33 taken along the XY plane in FIG.

The first foreign matter that has not been conveyed to the separation chamber 27 remains included in the air supply flow and accumulates in the trough 36.

The first foreign object is an object that is smaller than the distance (pitch) P between adjacent peaks 35 of the filter medium 33, smaller than the angle θ formed between the peaks 35 and troughs 36, and smaller than the depth L. The first foreign substance includes small insects and the like, and its shape is not uniform. Therefore, a large number of pores are formed in the layer of the first foreign matter deposited in the valley portion 36, and the layer becomes a porous layer.

According to such a configuration, when the air supply flow passes through the porous layer, part of the dust contained in the air supply flow is adsorbed with the first foreign matter as a core. Thereby, the amount of dust entering the filter medium 33 can be reduced, clogging of the filter medium 33 can be suppressed, and the life of the filter medium 33 can be extended. That is, since the first foreign matter plays a role as a dust adsorbent, the porous layer formed by the accumulation of the first foreign matter can be utilized as a filtering device for the air supply flow.

In addition, if there is no porous layer, the air supply that passes through the pleated filter medium 33 tends to concentrate near the tips of the troughs 36, and the amount of air that passes through the other portions is small. Therefore, the vicinity of the tip of the valley portion 36 tends to become clogged with dust and become a ventilation resistance area. However, when the air supply flow passes through the pores of the porous layer, the flow of the air supply changes in various directions, so that the air supply flow reaches the filter medium 33 without being concentrated in the troughs 36. That is, since the porous layer is formed in the valley portion 36, the air supply flow passes through a wider range of the filter medium 33 than in the case where there is no porous layer. As a result, dust is collected evenly throughout the filter medium 33, so that the formation of ventilation resistance portions can be suppressed. The purpose of forming the filter medium 33 into a pleated shape is to increase the effective area of the filter medium 33. In the present invention, the effect for the purpose of forming the filter medium 33 into a pleated shape can be enhanced by utilizing the first foreign matter contained in the air supply flow without preparing an additional member.

Note that the above effect has been confirmed through experiments, and is shown in FIG. 8.

FIG. 8 is a graph summarizing how the pressure loss of the filter medium 33 through which the air supply flow passes changes over time. Line A of the graph represents the ventilation system of the present invention, and line B represents the ventilation system designed to prevent foreign matter from entering the filter. Both ventilation systems have the same air supply flow rate of 120 m ³ /h. The specifications of the filter medium 33 are W1 = approximately 220 mm, H1 = approximately 190 mm, L2 = approximately 35 mm, and P = approximately 4 mm.

The filter medium 33 is taken out every time a certain period of time elapses, and the pressure loss when an air volume of 100 m ³ /h is applied is measured. As a result, it was confirmed that the pressure loss of the ventilation system in which the first foreign matter shown by line B does not accumulate on the filter medium 33 increases with time. In other words, by depositing the first foreign matter in the troughs 36 of the filter medium 33, the increase in pressure loss can be suppressed by the mechanism described in this embodiment. In order to obtain the effect shown in FIG. 8, the ratio of the distance L1 between the upstream bottom 28 and the downstream bottom 29 to the inner diameter D2 of the downstream bottom 29 should be L1/D2=0.36 or more. , the ratio of the inner diameter D2 of the downstream bottom part 29 to the inner diameter D5 of the duct 8 is D2/D5=1.4 or more and 1.7 or less, and the average wind speed of the swirling airflow is 1.7 m/sec or more3. It is preferable to adjust the output of the air supply blower 7 so that the speed is .5 m/sec or less.

As described above, it is possible to provide a ventilation system that suppresses the increase in pressure loss of the filter medium 33, achieves a longer service life, and extends the maintenance cycle.

Note that the air supply device 3 shown in Embodiment 1 may be a heat exchange type ventilation device having a heat exchange element that exchanges heat between the supply air flow and the exhaust air flow. The supply air flow and exhaust air flow of a heat exchange ventilator exchange thermal energy as they pass through the heat exchange element, thereby reducing the loss of thermal energy associated with ventilation. In order to increase the efficiency of heat energy exchange, it is preferable to make the supply air flow rate and the exhaust air flow rate equal. However, if the filter medium 33 is clogged with dust, the pressure loss increases and the air supply flow rate decreases, resulting in a decrease in heat exchange efficiency. Therefore, by installing the ventilation system of the present invention, it is possible to suppress the increase in pressure loss of the filter and achieve a longer service life, so it is possible to maintain high heat exchange efficiency as well as extend the maintenance cycle. This effect is achieved.

(Summary of embodiment)
The air supply hood device includes: an air supply hood device disposed at one end of the air supply path to generate a swirling airflow with respect to the air supply flow; and a filter section disposed downstream of the air supply hood device, the air supply hood device comprising: a separation unit that separates a plurality of foreign substances contained in the supply air flow by the swirling airflow into first foreign substances that are transported to the filter unit and second foreign substances that are not transported to the filter unit, the filter unit: It has a configuration including an upstream section provided on the upstream side, and a deposition section that deposits the first foreign matter conveyed from the air supply hood device on the downstream side of the upstream side.

This makes it possible to prevent dust from adhering to the filter section by adsorbing the dust contained in the air supply flow to the first foreign matter deposited in the accumulation section, thereby extending the service life (extending the maintenance cycle of the filter). ).

Further, the filter portion may have a pleated shape having a top portion provided as the upstream portion and a trough portion provided as the deposition portion.

This produces an effect that the first foreign matter can be efficiently deposited in the pleat-shaped troughs.

Further, the air supply hood device may be configured to include a drop opening for causing the second foreign object to fall out of the air supply hood device.

As a result, the second foreign matter that is not conveyed to the filter section can be automatically removed, resulting in an effect of improving the maintainability of the air supply hood device.

Further, the air supply hood device may be provided outdoors.

As a result, the second foreign matter can be automatically removed outdoors, which has the effect of improving the maintainability of the air supply hood device.

Further, the separating section may have a truncated conical shape, and the diameter of the downstream bottom portion may be larger than the diameter of the upstream bottom portion.

As a result, swirling airflow can be efficiently generated in the separating section, so that the air supply hood device can efficiently separate the first foreign matter and the second foreign matter.

Further, the ratio of the distance between the upstream bottom part and the downstream bottom part to the diameter of the downstream bottom part may be set to 0.36 or more.

As a result, swirling airflow can be efficiently generated in the separating section, so that the air supply hood device can efficiently separate the first foreign matter and the second foreign matter.

Further, a configuration may be adopted in which a ventilation device that blows air from upstream to downstream is provided downstream of the air supply hood device.

This has the effect of suppressing problems such as an increase in noise level and a shortened lifespan due to an increase in the load on the ventilation blower motor mounted in the ventilation device due to clogging of the filter section.

Further, the air supply hood device may be connected to the ventilation device via a duct.

Thereby, the construction of the air supply hood device and the ventilation device can be diversified, so that it can be installed in a wide range of homes.

Further, the average wind speed of the swirling air current may be set to 1.7 m/sec or more and 3.5 m/sec or less.

As a result, swirling airflow can be efficiently generated in the separating section, so that the air supply hood device can efficiently separate the first foreign matter and the second foreign matter.

Furthermore, the filter section may be arranged within the ventilation device or within the duct.

This makes it possible to diversify the construction of ducts and ventilation systems, further increasing the ability to install them in a wide range of homes.

Further, the first foreign matter may be configured to form a porous layer while being deposited in the troughs.

As a result, the supply air flow passes through the holes in the porous layer and enters a wide range of the troughs, which prevents dust contained in the supply air flow from concentrating in one place and causing clogging. It has the effect of

Further, the ventilation device may include a heat exchange element that exchanges heat between the supply air flow and the exhaust air flow. Thereby, the ventilation device can reduce the loss of thermal energy due to air supply and exhaust, but the accumulation part can suppress clogging of the filter part, and it can prevent the supply air flow rate and the exhaust air flow rate from becoming uneven. This has the effect of increasing thermal energy recovery efficiency.

The ventilation system according to the present invention makes it possible to extend the filter maintenance cycle, and is therefore useful as a ventilation system with an air supply function for use in houses.

1 Air supply hood device 2 Filter portion 3 Air supply device 4 Case 5 Outside air intake 6 Indoor air outlet 7 Air supply blower 8 Duct 9 Outer wall 10 Cover portion 11 Base portion 12 Front plate 13 Side plate 14 Air supply inlet 15 Rectifier plate 16 Central shaft 17 Air supply outlet 18 Discharge part 19 Discharge promoting surface 20 Discharge side surface 21 Discharge bottom surface 22 Discharge port 23 Central shaft 24 Inner cylinder pipe 24a End part 25 Separation part 26 Turning chamber 27 Separation chamber 28 Upstream bottom part 29 Downstream bottom part 30 Through hole 31 Space dividing plate 32 Inflow airflow control plate 32a End 32b End 33 Filter medium 34 Frame 35 Top 36 Valley 37 Separation chamber bottom 37a Curved surface 37b Curved surface

Claims (7)

an air supply hood device that is disposed at one end of the air supply path and generates a swirling airflow with respect to the air supply flow;
a filter section disposed downstream of the air supply hood device;
a ventilation device located downstream of the air supply hood device and blowing air from upstream to downstream;
Equipped with
The air supply hood device includes:
connected to the ventilation device via a duct;
comprising a separation unit that separates a plurality of foreign substances contained in the supply air flow by the swirling air flow into first foreign substances that are conveyed to the filter unit and second foreign substances that are not conveyed to the filter unit,
The separation section is
It has a truncated conical shape in which the diameter of the downstream bottom is larger than the diameter of the upstream bottom.
The ratio of the distance between the upstream bottom and the downstream bottom to the diameter of the downstream bottom is 0.36 or more,
The ratio of the diameter of the downstream bottom to the diameter of the duct is 1.4 or more and 1.7 or less,
The average wind speed of the swirling airflow is 1.7 m/sec or more and 3.5 m/sec or less,
The filter section is
an upstream section provided on the upstream side;
A ventilation system comprising: a deposition section that deposits the first foreign matter conveyed from the air supply hood device on a downstream side of the upstream side. The filter section is
a top portion provided as the upstream portion;
The ventilation system according to claim 1, wherein the ventilation system has a pleat shape having a valley portion provided as the pile portion. The air supply hood device includes:
The ventilation system according to claim 1, further comprising a drop opening for allowing the second foreign object to fall out of the air supply hood device. The air supply hood device includes:
The ventilation system according to claim 3, which is installed outdoors. The filter section is
2. A ventilation system according to claim 1 , wherein the ventilation system is located within the ventilation device or within the duct. The ventilation system according to claim 1, wherein the first foreign matter forms a porous layer while being deposited in the valleys. 2. The ventilation system of claim 1 , wherein the ventilation device includes a heat exchange element for exchanging heat between the supply air flow and the exhaust air flow.

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