JP7349597B2 - cyclone separator - Google Patents

Description

The present invention relates to a cyclone separation device that uses centrifugal force to separate foreign substances contained in air.

Conventionally, this type of cyclone separation device was installed at the air supply opening on the outside wall of a house in order to separate insects and dust (hereinafter referred to as foreign matter) that are inhaled with the outside air when the outside air is taken into the room. is used.

For example, in Patent Document 1, in a house equipped with a ventilation device that supplies and exhausts air, a cyclone separation device is provided at an air supply port that takes in outdoor air. As a result, foreign matter contained in the air is separated by the cyclone separator, and the separated foreign matter is stored in a separation chamber provided inside the cyclone separator, thereby preventing foreign matter from entering the ventilation system.

Further, in Patent Document 2, a cyclone separation device is provided at an air supply port portion that takes in outdoor air in a house equipped with a ventilation device that similarly performs air supply and exhaust. A separation chamber is also provided to store the separated foreign matter. The separation chamber has a structure in which the lid opens using wind power, and when the lid opens due to wind generated in nature (hereinafter referred to as natural wind), the separated foreign substances are discharged outdoors. ing.

Its structure is to have a wind baffle that receives wind pressure, and a fulcrum at the top of the buff to allow it to move like a pendulum in response to a certain amount of strong wind. The structure is such that two lids installed in the separation chamber are opened alternately.

JP2007-98208A Japanese Patent Application Publication No. 2008-36579

In such a conventional cyclone separation device, when foreign matter is stored in the separation chamber as in Patent Document 1, it is necessary to perform maintenance to periodically remove the stored material. In addition, if a wind plate is provided as in Patent Document 2 and it moves like a pendulum when a certain amount of strong wind is applied, the device becomes larger and requires regular maintenance because it has moving parts. Ta.

In addition, the reason why the two lids are opened using wind is that if the lid is left open all the time, air will flow in from those areas and the separated foreign matter will fly up and be re-splattered downstream of the main unit. This is because this phenomenon occurs and the separation performance deteriorates.

Therefore, it is possible to suppress the deterioration of separation performance due to re-scattering while having a discharge structure that does not require regular maintenance, has a discharge port that is always open, and can discharge foreign matter separated by a cyclone using natural wind. The purpose of the present invention is to provide a cyclone separation device with a structure that allows

In order to achieve this object, the cyclone separation device according to the present invention includes a rectangular casing having a front surface, a back surface, and a side surface, and a central axis passing through the center of the front surface and the center of the back surface, and a plate. A rectangular shape that divides the casing into a space on the front side and a space on the back side, and has an opening in the center that includes the central axis.
a separator, an inlet for air to flow into the housing on a side surface on the back side of the housing , and an inner cylinder pipe that passes from the space on the front side through the central opening in the square separator and connects to the back side of the housing. , an outlet provided on the back of the housing to allow air in the space on the front side to flow out of the housing via an inner tube , and a cylindrical body, one end of which is connected to a square separator. , the other end, which is different from the one end, is covered with the front side of the housing, and the inside of the space on the front side of the housing is connected to the outer peripheral side near the side surface of the housing and the center of the housing. A space dividing plate that partitions the inner circumferential side including the center portion to which the shaft belongs ; a separation chamber formed on the outer circumferential side by the space dividing plate; and a swirling chamber formed on the inner circumferential side of the separation chamber. and a through hole provided on the side surface of the cylindrical body in the space dividing plate to communicate the separation chamber and the swirling chamber; A swirling flow generation means leading to the swirling chamber in the space on the front side , and a discharge port that is always open and communicates the inside of the separation chamber with the outside of the housing, on the lower side of the side forming the housing. When the central axis is horizontal and the lower side is positioned at the bottom and the outlet is placed at the lowest position, the upper part of the outlet is below the central axis and in the separation chamber. An inflow airflow control plate disposed inside, the inflow airflow control plate extends from side to side across the outlet center perpendicular line drawn directly above from the center of the outlet when viewed from the front side. Of the left and right areas divided by the perpendicular line to the center of the outlet, the side where the through hole exists is inclined downward . Four quadrants: the first quadrant located on the upper right, the second quadrant located on the upper left, the third quadrant located on the lower left, and the fourth quadrant located on the lower right in the coordinate plane composed of the axis and the horizontal X axis. The through hole is located in the second quadrant of the coordinate plane in the swirling direction of the airflow in the swirling chamber,
The separation chamber has curved surfaces along the outer periphery of the cylindrical body of the space dividing plate in the third and fourth quadrants of the coordinate plane, and two planes parallel to the axis of the coordinate plane in the first and second quadrants, respectively. The two planes parallel to the axis of the coordinate plane are the separation chamber side surface, which is the side surface of the separation chamber parallel to the Y axis, and the separation chamber top surface, which is the top surface of the separation chamber parallel to the X axis. The cross section of the plane that includes the central axis and intersects the separation chamber increases in cross-sectional area toward the top of the separation chamber within the range that includes the side surfaces of the separation chamber; The bottom surface of the separation chamber has a curved surface that is a concentric circle of the space dividing plate, or a continuous surface of a curved surface and an inclined surface, with the side surface of the separation chamber elevated when viewed from the front , and the outer periphery is higher than the space dividing plate with respect to the central axis. It is located on the side, forms a separation chamber between it and the space dividing plate, is formed at a higher position than the discharge port, and has a downward slope from the lower end of the continuous surface toward the discharge port provided at the bottom. This is how the intended purpose is achieved.

According to the present invention, the discharge port that is always open allows separated foreign matter to be discharged out of the casing by the force of natural wind, while suppressing the occurrence of re-scattering phenomenon.

A perspective view of the cyclone separation device according to Embodiment 1 of the present invention as seen from the diagonally lower front side. Side sectional view of the first embodiment Detailed view of the square separator of Embodiment 1 (diagram showing the relationship between the cover and the square separator) Front sectional view of the first embodiment A diagram showing a cross section of the separation chamber of the first embodiment. Front sectional view of the second embodiment Detailed diagram of the discharge section of the second embodiment

The cyclone separation device according to the present invention includes an inlet that allows air to flow into the casing, a swirling flow generating means that generates a swirling airflow within the casing , and a swirling flow generating means that is provided on the back of the casing to cause air to flow out of the casing . an outflow port, a space dividing plate that partitions the inside of the casing into an outer periphery side near the side surface of the casing and an inner periphery side including the center of the casing ; A separation chamber and a swirling chamber formed on the inner circumferential side , a through hole that communicates the separation chamber and the swirling chamber , and a connection between the inside of the separation chamber and the casing .
An exhaust port that communicates with the outside of the body and is always open , and an upper part of the exhaust port inside the separation chamber when the central axis of the swirling chamber is placed at the lowest position with the central axis of the swirling chamber being horizontal. an inflow airflow control plate disposed in the casing , the inflow airflow control plate is a plate body with the through hole side inclined downward when viewed from the front side of the housing , and the separation chamber has a central axis It has an annular space extending over four quadrants in a coordinate plane centered on the center, the through hole is located in the second quadrant of the coordinate plane in the swirling direction of the airflow in the swirling chamber, and the separation chamber is located in the second quadrant of the coordinate plane in the swirling direction of the airflow in the swirling chamber. It has a curved surface along the space dividing plate in the third and fourth quadrants, and two planes parallel to the axis of the coordinate plane in the first and second quadrants , respectively.The bottom of the separation chamber is the side surface of the separation chamber. The bottom surface of the separation chamber is comprised of a curved surface with raised sides or a continuous surface of a curved surface and an inclined surface, and the bottom surface of the separation chamber is formed at a position higher than the discharge port and slopes downward toward the discharge port. It is something that exists .

Thereby, the foreign matter separated in the separation chamber can be discharged from the discharge port to the outside of the casing by the force of natural wind, and maintenance can be reduced.

Airflow flows into the separation chamber from the exhaust port, but the inflow airflow control plate allows the direction of the inflowing airflow to be directed to the opposite side of the through hole, so that the airflow that flows in from the exhaust port causes the air to fly up. Foreign matter can be prevented from directly flowing into the through hole, and re-scattering phenomenon can be suppressed. Furthermore, the airflow flowing in from the outlet flows in the direction of the fourth quadrant and the first quadrant away from the through hole by the inflow airflow control plate, and as it heads toward the upper part of the separation chamber in the first quadrant, the cross-sectional area expands. Since the force of the airflow is weakened and the foreign matter can be prevented from being lifted up to the upper part of the separation chamber, the re-scattering phenomenon can be further suppressed.

Further, in the cyclone separation device according to the present invention, the two planes parallel to the axis of the coordinate plane constitute a separation chamber side surface, which is a side surface of the separation chamber, and a separation chamber top surface, which is a top surface of the separation chamber, The bottom surface of the separation chamber is a curved surface with a raised side surface or a continuous surface of a curved surface and an inclined surface. The cross-sectional area is such that the cross-sectional area increases toward the top of the separation chamber within the range where it contacts the side surface of the separation chamber.

As a result, in the third and fourth quadrants, the bottom surface of the separation chamber has a downward slope toward the discharge port, so that foreign matter discharged from the through hole into the separation chamber rolls down along the slope, so that it can be discharged. Since foreign matter is more likely to collect near the exit, the discharge of foreign matter is promoted. In addition, because the side of the separation chamber stands vertically and the area of the cross section that intersects with the side of the separation chamber is increased in the rotational direction toward the second quadrant, the airflow toward the top of the separation chamber is Since the airflow is directed upward along the vertical surface, foreign substances are carried by the airflow and scattered upward in the vertical direction.Furthermore, since the top surface of the separation chamber is a horizontal plane, the rising airflow is directed toward the top of the separation chamber. It is easy to collide with a surface and lose momentum. Therefore, even if foreign objects fly up above the separation chamber on the through-hole side, they are prevented from falling directly into the through-hole, and above the separation chamber on the side without through-holes, foreign objects circulate above the outside of the space dividing plate. It is possible to suppress the particles from moving toward the through-hole side, and it is possible to further suppress the re-scattering phenomenon.

Further, in the cyclone separation device according to the present invention, the casing has a hexahedral shape, and a partition plate is provided inside the casing to partition the front side of the casing and the back side of the casing . In the four side surfaces adjacent to the rear surface of the casing , an inlet is provided that opens from the partition plate to the back surface and communicates with the swirling flow generating means, and a space is provided on the front side of the casing . The dividing plate, the bottom of the separation chamber, the top of the separation chamber, the side of the separation chamber, and the discharge port are arranged respectively . and the side surface of the separation chamber.

As a result, while the external appearance of the device is rectangular, the surface that makes up the separation chamber also serves as the surface of the casing, which prevents the device from becoming larger and allows separated foreign matter to be removed by natural wind. It is possible to suppress the re-scattering phenomenon while making it possible.

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

(Embodiment 1)
This embodiment will be described below based on an example in which a cyclone separation device is applied to a ventilation hood.

A ventilation hood 1 shown in FIG. 1 is attached to an air supply port provided on the outer wall of a house. It is installed on the exterior wall of a house and is attached to an air intake that brings outdoor air into the house.

A device (not shown) for taking outdoor air into the house includes a blower (not shown) and a ventilation duct (not shown) installed in the house, and connects the blower and the ventilation hood 1. Connected. Thereby, the air that has passed through the ventilation hood 1 can be introduced into the room.

The ventilation hood 1 is connected to a ventilation duct using an outflow pipe 2 and is installed so as to protrude from the outer wall of the house.

Next, the external configuration of the ventilation hood 1 will be described.

The casing 5 of the ventilation hood 1 has a hexahedral shape and includes a cover 3 on the front side and a base plate 4 on the back side as shown in FIG. The cover 3, which is the main part of the ventilation hood 1, is a rectangular box that closes off the front side, and the four side faces are open as the inlet 7 on the back side. Although the front surface of FIG. 1, that is, the front surface of the ventilation port hood 1, has a planar shape, it may have a dome shape with a protruding central portion.

The side surface of the cover 3 is adjacent to the base plate 4, and the cover 3 forms the outer shell of the ventilation hood 1.

On the downstream side of the inflow port 7, a plurality of fixed vanes 8 are disposed diagonally toward the central axis 6 as a swirling flow generating means for swirling the inflowing air. In other words, the fixed blades 8 are arranged rotationally symmetrically with respect to the central axis 6 at equal intervals. Further, a net may be provided around the inlet 7 and the fixed blade 8 to prevent large insects and birds from entering the device.

The base plate 4 has a circular opening in the center, and the outflow pipe 2 is connected to the opening. The air inside the cover 3 is configured to flow out from an outlet 9 at one end of the outflow pipe 2.

In a state in which the central axis 6 is disposed substantially horizontally, a discharge portion 11 is provided at the lower part of the cover 3 so as to protrude from the side surface. The discharge part 11 is provided with discharge promoting surfaces 10 having slopes on the inside and outside.

The discharge promoting surface 10 is two surfaces arranged symmetrically, and is further connected to another two surfaces to form a discharge port 12 that is always open at the bottom. This constitutes the discharge section 11. The discharge section 11 is located at the bottom of the cover 3.

The discharge part 11 has a discharge promotion surface 10 inclined in a direction in which the cross-sectional area becomes smaller toward the bottom, and is provided with a discharge port 12 opened at the tip thereof so as to communicate the inside and outside of the ventilation hood 1. The discharge section 11 includes a discharge promoting surface 10 and a discharge port 12.

The discharge port 12 is located at the lower part of the discharge portion 11 and has a rectangular shape that is elongated in the direction of the central axis 6 .

This is because the elongated shape makes it difficult for large insects, birds, etc. to enter, and increases the area that makes it easier to expel separated foreign substances. Furthermore, the reason why the discharge port 12 is made longer in the direction of the central axis 6 is to enhance the discharge effect by natural wind, which will be described later.

The symmetrical structure of the discharge promoting surface 10 is intended to obtain the same discharge promoting effect no matter which direction the natural wind blows from. Furthermore, although the discharge promoting surfaces 10 are required to have slopes on both the left and right sides, they do not need to have a strictly symmetrical structure, and the angles may be slightly different.

In particular, in this embodiment, a smooth surface that gradually becomes steeper like an upside-down Mt. Fuji is used so that the natural wind that collides with the discharge promoting surface 10 can change its direction smoothly.

Next, the internal configuration of this device will be explained using FIG. 2.

When the discharge part 11 is located at the lowest part of the cover 3, as shown in FIG. 13 and a square separator 32.

An inner cylindrical pipe 19 and a fixed blade 8 are connected to the base plate 4. The inner cylindrical tube 19 and the fixed blade 8 are arranged concentrically with respect to the central axis 6, with the inner cylindrical tube 19 facing inside.

The inner cylindrical pipe 19 is a pipe body that communicates with the outflow pipe 2 . The inner cylindrical pipe 19 is provided on the opposite side of the base plate 4 so as to communicate with the outlet 9. Furthermore, the end surface 19a of the inner cylindrical tube 19 is located inside the cover 3 on the front side of the cover 3 compared to the fixed blade 8. In other words, it is arranged on the back side when viewed from the fixed blade 8 in the direction of the central axis 6. In this embodiment, the inner diameter of the inner tube 19 is different from the inner diameter of the outflow tube 2 in the base plate 4 portion, and the inner diameter of the inner tube 19 is smaller than the inner diameter of the outflow tube 2. However, they may be the same size. If turbulence in the airflow is expected due to sudden expansion occurring on the outflow pipe 2 side at the base plate 4 portion, the shape may be such that it gradually expands.

As shown in FIG. 3, the rectangular separator 32 is a plate with an opening 28 in the center, and is arranged perpendicularly to the central axis 6 to divide the internal space into two.

As shown in FIG. 2, the rectangular separator 32 has the fixed blade 8 connected to one surface and the space dividing plate 13 connected to the other surface. That is, within the internal space surrounded by the cover 3 and the base plate 4, the fixed blade 8, the square separator 32, and the space dividing plate 13 are arranged in this order.

The inflow ports 7 provided on the four side surfaces of the cover 3 facing the fixed blades 8 are arranged on the back side of the cover 3 with the rectangular separator 32 as a boundary, as shown in FIG. Thereby, the fixed blade 8 and the inlet 7 are opposed to each other.

The space dividing plate 13 is a cylinder whose axis is aligned with the direction of the central axis 6, and partitions the inside of the cover 3 into an inside and an outside.

The cross section of the turning chamber 14 formed inside the space dividing plate 13 (in the plane direction perpendicular to the central axis 6) is such that the cross sectional area increases toward the base plate 4 side within the cover 3. It has a truncated cone shape with sloped sides. In addition, it may be a cylindrical shape whose cross-sectional area does not change.

As described above, the inside of the space dividing plate 13 is the turning chamber 14 that includes the center of the cover 3, and the outer circumferential side closer to the side surface of the cover 3 outside the space dividing plate 13 (where the space dividing plate 13 and the cover 3 are The enclosed space) is the separation chamber 15.

FIG. 4 is a sectional view of the front side of the cover 3 cut out from the inlet 7 at a position containing the separation chamber 15.

As shown in FIG. 4, the separation chamber 15 is an annular space spanning four quadrants in a coordinate plane 33 centered on the central axis 6 and using a horizontal X-axis 38 and a vertical Y-axis 39. It is.

As shown in FIG. 4, when the outlet 12 is placed at the lowest position with the central axis 6 horizontal, the through hole 16 is The separation chamber 15 is located in the second quadrant 34 of the coordinate plane 33, and has a curved surface 29b along the space dividing plate 13 in the third and fourth quadrants 35 and 36 of the coordinate plane 33, and The two quadrants 34 have two planes parallel to the X-axis 38 and the Y-axis 39 forming the coordinate plane 33, respectively. The two planes parallel to the X-axis 38 and the Y-axis 39 are the separation chamber side surface 30 and the separation chamber top surface 31 shown in FIG.

That is, as shown in FIG. 4, the side surface of the separation chamber 15 is composed of a separation chamber bottom surface 29, a separation chamber side surface 30, and a separation chamber top surface 31, and the inner wall surface of the cover 3 constituting the housing 5 is They are a separation chamber side surface 30 and a separation chamber top surface 31.

The separation chamber side surfaces 30 are two planes that stand upright in the vertical direction, and are symmetrically located with the discharge port 12 located in the center in between. The upper part of the separation chamber side surface 30 is adjacent to the separation chamber top surface 31 on a plane. The lower part of the separation chamber side surface 30 is adjacent to the separation chamber bottom surface 29 .

The separation chamber bottom surface 29 is two surfaces that connect the separation chamber side surface 30 to the discharge promotion surface 10 and are located on both sides with the discharge port 12 in between.

In this embodiment, the separation chamber bottom surface 29 is composed of a flat surface 29a, a curved surface 29b, and a flat surface 29c that are continuous in this order, and is sloped so that the separation chamber side surface 30 side is higher than the discharge promoting surface 10 side. form a surface. That is, on the bottom surface of the separation chamber 15, the separation chamber bottom surface 29 is formed from a continuous surface with the separation chamber side surface 30 side higher than the central portion. The separation chamber bottom surface 29 may be composed of only a continuous curved surface.

In the present embodiment, the separation chamber 15 is a space surrounded by a cover 3, a space dividing plate 13, a square separator 32, a separation chamber bottom surface 29 forming side surfaces, a separation chamber side surface 30, and a separation chamber top surface 31. becomes.

The separation chamber 15 has a cross-sectional area that changes around the central axis 6. Since the separation chamber 15 is an annular space, a cross section around the central axis 6 can be defined. The cross section of the separation chamber 15 shows a cross section of one side of a portion where a plane including the central axis 6 intersects the space of the separation chamber. One side means that the separation chamber 15 is an annular space surrounding the central axis 6, so when considering the plane that includes the central axis 6, there are two parts that intersect with the space of the separation chamber 15 . It means to represent a cross section.

In the first quadrant 37, the cross section 41 intersecting the separation chamber side surface 30 has the smallest cross-sectional area in the horizontal cross section 42. Further, the cross section 41 has an increased cross-sectional area outside the space dividing plate 13 and in the rotational direction toward the second quadrant 34. In other words, the cross section 41 of the plane that includes the central axis 6 and intersects with the separation chamber 15 has a cross-sectional area that increases toward the top surface 31 of the separation chamber within the range where it contacts the side surface 30 of the separation chamber. . In FIG. 4, the separation chamber side surface 30 and the separation chamber top surface 31 are directly connected, but they may be connected via a curved surface at a corner portion, or may be connected via a slope. In such a case, it is desirable to gradually expand the cross-sectional area in the Y-axis direction at least in a range lower than the uppermost generatrix 40 of the space dividing plate 13. In FIG. 5, a cross section 41 located at the same height as the uppermost generatrix 40 is a cross section 43.

Further, the cross section of the separation chamber 15 in the second quadrant 34 also gradually increases in cross-sectional area from the X-axis 38 toward the separation chamber top surface 31 within the range of contact with the separation chamber side surface 30.

Further, in the third quadrant 35 and the fourth quadrant 36, the cross section 44 intersecting the curved surface 29b has the smallest area. The cross section 42 has a larger cross-sectional area than the cross section 44.

That is, compared to the minimum cross-sectional area in the third quadrant 35 and the fourth quadrant 36, in the first quadrant 37, at least, from the entrance of the first quadrant 37, which is a horizontal position, The cross-sectional area of the cross-section 41 is increased in the range where the cross-section is low.

A through hole 16 is provided in the space dividing plate 13, and the swirling chamber 14 and the separation chamber 15 communicate with each other via the through hole 16. The through hole 16 is located at the farthest position from the inlet 7 in the direction of the central axis 6 on the space dividing plate 13, and at the side above the central axis 6 where the swirling direction of the airflow in the swirling chamber 14 is downward. be. As shown in the cross-sectional view of FIG. 2, the through hole 16 is provided at a distance from the tip of the inner tube 19 in the direction of the central axis 6.

The base of the space dividing plate 13 (the end on the fixed blade 8 side) is connected to the square separator 32 . By connecting the square separator 32, the gap between the circular space dividing plate 13 and the square cover 3 is closed, and one end of the separation chamber 15 is covered, so that the separation chamber 15 can be opened inside the cover 3. It is a closed circular space. This prevents the air that has passed through the inlet 7 from directly flowing into the separation chamber 15. If there is a gap in the separation chamber 15 that communicates with the outside of the device other than the discharge port 12, air will enter the separation chamber 15 from there and the airflow toward the swirling chamber 14 will become stronger in the through hole 16, so that the separation in the swirling chamber 14 will become stronger. This is because the removed foreign matter cannot be moved to the separation chamber 15, and the separation rate decreases.

Further, the top portion of the space dividing plate 13 (the end portion on the side other than the fixed blade 8 side) is covered by the front side of the cover 3. The lid may have a surface that closes the top of the space dividing plate 13, or may have the space dividing plate 13 in contact with the inside of the cover 3. As an example in which a surface that closes the top of the space dividing plate 13 is provided, a turning chamber front surface 17 is provided in FIG. 2 . Moreover, the space dividing plate 13 and the turning chamber front 17 are constructed continuously.

To summarize the configuration centering around the square separator 32, as shown in FIG. 2, the relationship between the square separator 32 and each component is summarized. , a fixed blade 8, a base plate 4, an outflow pipe 2, etc., and a space dividing plate 13, a swirling chamber 14, a separation chamber 15, a discharge port 12, etc. on the front side. Note that the inner cylindrical pipe 19 is installed so as to penetrate through the center of the opening 28 of the square separator 32. Further, the opening 28 provided at the center of the square separator 32 allows the swirling chamber 14 and the space inside the fixed blade 8 to communicate with each other.

The space outside the space dividing plate 13 and surrounded by the cover 3 is a separation chamber 15, and since the front face 17 of the swirling chamber is almost in close contact with the cover 3, the separation chamber 15 is a cylindrical space that goes around once. In other words, it is an annular space. Note that the space dividing plate 13 must always be in the shape of a rotating body, regardless of the shape of the cover 3.

The separation chamber 15 also has an inner surface on the front side of the cover 3 shown in FIG. 2 as a separation chamber front surface 18. Note that the degree of close contact between the front surface of the swirling chamber 17 and the front surface of the separation chamber 18 is designed such that a slight gap is created between the front surface of the swirling chamber 17 and the inner surface of the front side of the cover 3 due to assembly accuracy.

In this way, the separation chamber front 18 and the swirling chamber front 17 can be formed on substantially the same plane, so that the thickness of the present cyclone separation device, that is, the ventilation hood 1 can be minimized in the direction of the central axis 6. be able to.

As shown in FIG. 4, when the outlet 12 is placed at the lowest position with the central axis 6 horizontal, the inflow airflow control plate 20 is placed above the outlet 12 inside the separation chamber 15. . The inflow airflow control plate 20 is a plate whose through hole 16 side is inclined downward when viewed from the front side of the housing 5 in FIG. 4 .

As shown in FIG. 4, the inflow airflow control plate 20 has an inclination that straddles the outlet center perpendicular line 24 drawn directly above the center of the outlet 12, and is further pushed out from the separation chamber front 18 in the direction of the central axis 6. It is a plate body, and the extruded tip collides with the space dividing plate 13 forming the separation chamber 15.

As shown in FIG. 4, the inflow airflow control plate 20 has two ends. The two ends can be distinguished into an upper end 25 and a lower end 26 by the inclination of the inflow control plate 20. The side closer to the center axis 6 is arranged on the upper side, and the side farther away is arranged on the lower side, and the upper side is arranged in a direction farther from the through hole 16 than the lower side in the circumferential direction. The upper end is the upper end 25 and the lower end is the lower end 26. Further, a gap is provided between the upper end portion 25 of the inflow airflow control plate 20 and the space dividing plate 13.

In the above configuration, the flow of airflow will be explained.

When a blower (not shown) is operated, outdoor air containing foreign matter flows into the ventilation hood 1 through the inlet 7 shown in FIG. As the airflow passes through the fixed vanes 8, it becomes a swirling airflow, and since the inner tube 19 is placed closer to the front of the ventilation hood 1 than the inlet 7, the airflow flows toward the front of the ventilation hood 1 within the swirling chamber 14. Turn while doing so. Here, the foreign matter moves toward the space dividing plate 13 due to centrifugal force, and moves into the separation chamber 15 when passing near the through hole 16. The air from which foreign matter has been separated flows into the inner cylinder pipe 19, passes through the outflow pipe 2, and flows out of the apparatus from the outflow port 9.

The foreign matter that has moved to the separation chamber 15 is temporarily stored within the separation chamber 15.

As shown in FIG. 4, the air inside the separation chamber 15 becomes a swirling airflow in the same direction as the inside of the swirling chamber 14 as a whole due to the influence of the swirling airflow inside the swirling chamber 14 (all the airflows are in the same direction). Not necessarily). Therefore, the foreign matter stored in the separation chamber 15 also moves under the influence of the flow.

Since the bottom surface 29 of the separation chamber is sloped downward toward the discharge port 12, foreign matter carried by the swirling airflow flows into the discharge section 11 due to the slope of the bottom surface 29 of the separation chamber. As shown in FIG. 4, the upper part of the discharge part 11 is spread out in the left-right direction with respect to the lower part, so that foreign matter can easily be collected in the discharge part 11.

The bottom surface 29 of the separation chamber is composed of a plane 29a, a curved surface 29b, and a plane 29c that are continuous in this order, so that foreign substances can be guided to the discharge section 11 more smoothly. The curved surface 29b is a curved surface that is concentric with the space dividing plate 13, but the flat surface 29a is curved so that the space in the lower half (third and fourth quadrants) of the separation chamber 15 can easily collect foreign substances. The structure is such that the space is expanded in a shape. Further, the flat surface 29c maintains an inclination so that foreign matter can easily slide down into the discharge section 11.

Furthermore, by making the discharge part 11 longer in the direction of the central axis 6, the swirling airflow flowing inside the separation chamber 15 crosses the discharge part 11, and the foreign matter that has moved flows into the discharge part 11. It's easier to do. Note that the length in the direction of the central axis 6 may be expanded to be the same as the length (thickness) of the separation chamber 15 in the direction of the central axis 6.

When natural wind blows outside the casing 5, the foreign matter that has flowed into the discharge section 11 in this way is drawn out of the casing 5 by the natural wind. To explain in detail, natural wind (crosswind) may blow near the discharge section 11 on the outside of the casing 5. The natural wind changes direction along the slope of the discharge promotion surface 10 and becomes a downward airflow. Foreign matter present in the vicinity of the discharge port 12 within the casing 5 is pulled out of the casing 5 by being attracted by this airflow. In other words, the foreign matter temporarily stored in the separation chamber 15 is discharged to the outside of the casing 5 every time the natural wind blows, so there is no need to discharge the foreign matter separated within the ventilation hood 1.

Now, since the inside of the ventilation hood 1 is under negative pressure due to the blower, air flows into the separation chamber 15 from the exhaust port 12.

Air flowing into the separation chamber 15 from the outlet 12 flows in the direction of the outlet center perpendicular 24 .

Inside the separation chamber 15, there is an airflow (white arrow in FIG. 3) flowing from the swirling chamber 14 through the through hole 16, and the air that entered the separation chamber 15 from the outlet 12 is part of this airflow. Become.

The airflow flowing in from the discharge port 12 may stir up foreign matter temporarily stored in the separation chamber 15 and scatter the foreign matter downstream from the outlet 9 through the through hole 16, thereby causing a re-scattering phenomenon. By providing the inflow airflow control plate 20, this re-scattering phenomenon can be prevented. By providing the inflow airflow control plate 20 having an inclination so as to cover the upper part of the outlet 12, the airflow flowing in from the outlet 12 is made to collide with the inflow airflow control plate 20, and the airflow is directed in the direction away from the through hole 16. You can dodge it. The foreign matter that flies up at this time can be directed to the side where the through hole 16 does not exist, which is to the right of the outlet center perpendicular line 24 in FIG. In other words, the floating foreign matter can be kept away from the through-hole 16, thereby reducing the re-inflow of the foreign matter into the through-hole 16, suppressing the re-scattering phenomenon, and thus suppressing the deterioration of separation performance.

Furthermore, foreign matter that flies up on the side where the through hole 16 is not present, with respect to the discharge port center perpendicular 24, may travel further upward in the annular separation chamber 15 and toward the through hole 16.

In this embodiment, regarding the cross section 41, compared to the minimum cross-sectional area in the third quadrant 35 and the fourth quadrant 36, the cross-sectional area in the first quadrant 37 is lower than the uppermost generatrix 40 from the horizontal position. Since the size is gradually increased, the speed of the airflow flowing inside the separation chamber 15 can be reduced. This action weakens the upward force of the separated foreign matter, suppresses the foreign matter from crossing the uppermost generatrix 40 toward the through hole 16, and suppresses the re-scattering phenomenon. Furthermore, since the cross section 42 is horizontal at the entrance to the first quadrant 37 and the separation chamber side surface 30 is vertically erected, the airflow passing through the cross section 42 is directed directly upward. Since the separation chamber top surface 31 is flat in the horizontal direction toward which the airflow is directed, when the airflow flowing inside the separation chamber 15 collides with the separation chamber top surface 31, it loses momentum. The force of the airflow can be suppressed, and the re-scattering phenomenon can be suppressed.

The cross-sectional area of the cross-section 41 may also be expanded at a position beyond the uppermost generatrix 40. There is no problem because the space in the separation chamber 15 continues to expand over a longer distance, and the re-scattering phenomenon can be further suppressed.

In addition, in the second quadrant 34 after exceeding the uppermost generatrix 40, the cross section of the separation chamber becomes wider within the range where it contacts the separation chamber top surface 31, and furthermore, since the separation chamber top surface 31 is horizontal, The airflow flowing inside the separation chamber located in the second quadrant initially has horizontal directionality, so even if a foreign object crosses the uppermost generatrix 40, it will be scattered horizontally and will flow straight into the through hole 16. The inflow can be suppressed, and as a result, the re-scattering phenomenon can be suppressed.

Note that since the ventilation hood 1 is installed on the wall of the house, the natural wind blowing on the outside of the housing 5 does not flow toward the front because the wall is on the back side in FIG. 1. In addition, the flow of natural wind from the front side to the back side collides with the inflow airflow control plate 20 within the separation chamber 15, and re-scattering phenomenon can be prevented.

As described above, in the present invention, the foreign matter in the separation chamber 15 can be discharged from the always open discharge port 12 by the force of natural wind, and the work of discharging the separated foreign matter can be eliminated.

In particular, by controlling the airflow flowing in from the outlet 12 by expanding the cross-sectional change of the inflow airflow control plate 20 and the separation chamber 15, it is possible to suppress the re-entrainment phenomenon, thereby suppressing the deterioration of separation performance. The ventilation hood 1 can be provided.

Note that in this embodiment, the cross-sectional shape of the second quadrant 34 of the separation chamber 15 is not particularly described in detail, but it may be formed to be symmetrical to the cross-sectional shape of the first quadrant 37 with respect to the Y-axis 39. The through-hole 16 is desirably arranged within the second quadrant 34, particularly closer to the X-axis 38 side, from the viewpoint of making it easier for foreign matter discharged from the swirling chamber to fall downward.

(Embodiment 2)
Next, another internal structure of the separation chamber 15 will be explained using FIGS. 6 and 7.

FIG. 6 is a cross-sectional view of the cover 3 cut out from the front side of the inlet 7 at a position containing the separation chamber 15. As shown in FIG. FIG. 7 is a diagram showing the main parts including the discharge promoting surface 10.

In this embodiment, the separation chamber 15 includes four members: an inflow airflow control plate 20, a return plate 21, a lower shielding plate 22, and an upper shielding plate 23.

In the description of this embodiment, in order to facilitate understanding, the same components as in Embodiment 1 will be denoted by the same reference numerals, and detailed explanation will be omitted.

A lower shielding plate 22, a return plate 21, an inflow airflow control plate 20, and an upper shielding plate 23 are arranged in the separation chamber 15 in this order in the direction in which the swirling airflow flows, starting from the through hole 16.

An inflow airflow control plate 20 is provided above the outlet 12 . As shown in FIG. 6, the inflow airflow control plate 20 has an inclination across the outlet center perpendicular line 24 drawn directly above the center of the outlet 12, and further extends from the separation chamber front 18 toward the central axis 6. This plate is pushed out until it collides with the surface of the space dividing plate 13 that constitutes the chamber 15.

As shown in FIG. 7, the inflow airflow control plate 20 has the same structural features as in the first embodiment. As already explained, it has two ends. The two ends can be distinguished into an upper end 25 and a lower end 26 by the inclination of the inflow control plate 20. The side closer to the center axis 6 is arranged on the upper side, and the side farther away is arranged on the lower side, and the upper side is arranged in a direction farther from the through hole 16 than the lower side in the circumferential direction. The upper end is the upper end 25 and the lower end is the lower end 26. Further, a gap is provided between the upper end portion 25 of the inflow airflow control plate 20 and the space dividing plate 13.

The return plate 21 is a plate whose tip protrudes from the surface of the discharge promoting surface 10 (or may be a surface adjacent to the discharge promoting surface 10) toward the discharge port center perpendicular line 24. The protruding tip portion of the return plate 21 is referred to as a tip end portion 27.

The lower shielding plate 22 is a plate extending on a radius drawn from the central axis 6. The lower shielding plate 22 is configured to be in contact with the space dividing plate 13 on the inner circumferential side, and to leave a gap on the outer circumferential side.

There is a relationship between the ejection promoting surface 10, the tip end 27 of the return plate 21, and the lower shielding plate 22, and it is an extension of the tangent drawn from the distal end 27 to the ejection promoting surface 10 (the dotted line in FIGS. 5 to 8) in the opposite direction. The structure is such that the lower shielding plate 22 is present at the lower shielding plate 22.

When the discharge part 11 is located at the lowest part of the cover 3, the upper shielding plate 23 is located directly above the central axis 6, as shown in FIG. It is configured to be in contact with the plate 13 and leave a gap on the outer circumferential side. Note that the upper shielding plate 23 may be positioned anywhere as long as it is above the separation chamber 15 and above the through hole 16 (inside the upper space).

In the above configuration, the air flow and separation mechanism will be explained.

First, outdoor air containing foreign matter flows into the ventilation hood 1 through the inlet 7 shown in FIG. rotate. Here, the foreign matter moves toward the space dividing plate 13 due to centrifugal force, and moves into the separation chamber 15 when passing near the through hole 16. The air from which foreign matter has been separated flows into the inner cylinder pipe 19, passes through the outflow pipe 2, and flows out of the apparatus from the outflow port 9.

The foreign matter that has moved to the separation chamber 15 is temporarily stored within the separation chamber 15. Since the inside of the ventilation hood 1 is under negative pressure due to the blower, air also flows into the separation chamber 15 from the exhaust port 12. The inflowing air passes through the through hole 16 shown in FIG. 2, flows into the swirling chamber 14, and merges with the swirling airflow within the swirling chamber 14.

The airflow inside the separation chamber 15 will be described in detail below.

As described above, a portion of the swirling airflow flows into the separation chamber 15 from the through hole 16 provided in the space dividing plate 13 . Due to this influence, a swirling airflow is generated in the separation chamber 15 in the same direction as in the swirling chamber 14. However, since the inside of the ventilation hood 1 becomes negative pressure due to the downstream blower, airflow also flows into the separation chamber 15 from the discharge port 12 at the same time. The direction of this airflow is the direction of the outlet center perpendicular line 24. An airflow flows into the swirling chamber 14 through the through hole 16.

The airflow flowing in from the discharge port 12 may stir up foreign matter temporarily stored in the separation chamber 15 and cause a re-scattering phenomenon in which the foreign matter passes through the through hole 16 and is scattered downstream from the discharge port 9. By providing the inflow airflow control plate 20, this re-scattering phenomenon can be prevented. By providing the inflow airflow control plate 20 to cover the upper part of the discharge port 12, the airflow flowing in from the discharge port 12 collides with the inflow airflow control plate 20, and the airflow can be directed in a direction away from the through hole 16. . Therefore, the foreign matter flies up on the side where the through hole 16 does not exist, which is the right side of the outlet center perpendicular line 24 in FIG. It is possible to suppress the decrease in

At this time, foreign matter flying up on the side where the through hole 16 does not exist may travel further upward in the annular separation chamber 15 and toward the through hole 16 with respect to the outlet center perpendicular line 24 . In this case, by providing the upper shielding plate 23, the force of the swirling airflow (indicated by the white arrow in FIG. 3) in the separation chamber 15 can be weakened, so that the re-entrainment phenomenon can be further suppressed.

In FIGS. 6 and 7, when natural wind flows from the right to the left, the airflow is inclined to the left along the discharge promotion surface 10. In this case as well, the air does not collide with the incoming airflow control plate 20. Therefore, by providing the return plate 21 and providing the lower shielding plate 22 on the line connecting the tangent of the discharge promotion surface 10 and the tip end 27, the airflow flowing in from the discharge port 12 is tilted toward the through hole 16 side. Even if it faces in the direction of the dotted line in 6, it will collide with the lower shielding plate 22. Therefore, even if the foreign matter flies up, it collides with the lower shielding plate 22, loses momentum, and does not head directly toward the through hole 16, so that the phenomenon of re-scattering can be suppressed. In the present embodiment, a gap is further provided on the upper end 25 side of the inflow airflow control plate 20, so that a part of the airflow colliding with the lower shielding plate 22 is allowed to pass through to the side where the through hole 16 is not present. You can escape. In other words, the airflow from the lower shielding plate 22 toward the through hole 16 can be further reduced, and the re-scattering phenomenon can be further suppressed. As described above, in the present invention, foreign matter in the separation chamber 15 can be discharged from the discharge port 12 which is always open by the force of natural wind, and the airflow flowing in from the discharge port 12 is returned to the inflow airflow control plate 20. By controlling the four components of the plate 21, the lower shielding plate 22, and the upper shielding plate 23, it is possible to suppress the re-scattering phenomenon regardless of the direction of the natural wind, thereby reducing maintenance and improving separation performance. It is possible to provide a ventilation hood 1 that can suppress a decrease in the temperature.

By adding the three configurations of the return plate 21, lower shielding plate 22, and upper shielding plate 23 to the configuration of Embodiment 1, the separation performance of the ventilation hood 1, that is, the cyclone separation device can be further improved.

The cyclone separator according to the present invention can automatically discharge separated foreign substances using natural wind while suppressing the re-scattering phenomenon and suppressing the deterioration of separation performance. It is useful as a ventilation hood, etc. used for the air intake part of the outer wall of a house that takes in air.

1 Ventilation port hood 2 Outflow pipe 3 Cover 4 Base plate 5 Housing 6 Central axis 7 Inflow port 8 Fixed vane 9 Outflow port 10 Discharge promoting surface 11 Discharge section 12 Discharge port 13 Space dividing plate 14 Turning chamber 15 Separation chamber 16 Through hole 17 Front of turning chamber 18 Front of separation chamber 19 Inner tube 19a End face 20 Inflow airflow control plate 21 Return plate 22 Lower shielding plate 23 Upper shielding plate 24 Discharge port center perpendicular 25 Upper end 26 Lower end 27 Tip end 28 Opening 29 Separation chamber bottom surface 29a Plane 29b Curved surface 29c Plane 30 Separation chamber side surface 31 Separation chamber top surface 32 Square separator 33 Coordinate plane 35 Third quadrant 34 Second quadrant 36 Fourth quadrant 37 First quadrant 38 X-axis 39 Y-axis 40 Maximum Upper generatrix 41 Section 42 Section 43 Section 44 Section

Claims (3)

a rectangular casing having a front surface, a back surface, and a side surface, and a central axis passing through the center of the front surface and the center of the back surface;
a square separator that is plate-shaped and partitions the casing into a front side space and a back side space, and has an opening in the center that includes the central axis;
an inlet that allows air to flow into the housing on the side surface on the back side of the housing ;
an inner cylindrical pipe that passes from the space on the front side through the central opening in the square separator and connects to the back surface of the casing;
an outlet provided on the back surface of the casing for causing air in the space on the front side to flow out of the casing via the inner cylindrical pipe;
It is a cylindrical body, one end of the cylindrical body is connected to the square separator, the other end that is different from the one end is covered with the front side of the casing, and the cylindrical body is connected to the square separator. a space dividing plate that partitions the inside of the space on the front side into an outer peripheral side near the side surface of the housing and an inner peripheral side including a center portion to which the central axis of the housing belongs ;
A separation chamber formed on the outer circumference side and a swirling chamber formed on the inner circumference side of the separation chamber by the space dividing plate;
a through hole provided on a side surface of the cylindrical body in the space dividing plate and communicating the separation chamber and the swirling chamber;
swirling flow generating means that turns air flowing in from the inlet into a swirling airflow downstream of the inlet and guides it from the outer periphery of the inner cylindrical pipe to the swirling chamber in the space on the front side;
an ejection part having an ejection port that is always open and communicates the inside of the separation chamber with the outside of the casing, on a lower side surface of the lateral surfaces forming the casing;
When the discharge port is placed at the lowest position with the central axis horizontal and the lower side surface is located at the bottom , the upper part of the discharge port is located below the central axis and in the separation chamber. an inflow airflow control plate disposed inside;
The inflow airflow control plate is
In a front view, which is a viewpoint from the front side, the front area is provided across the left and right areas across the outlet center perpendicular line drawn directly above the center of the outlet outlet, and is divided by the outlet center perpendicular line. It is a plate body whose side where the through hole is present is inclined downward,
The separation chamber is
A first quadrant located in the upper right corner, a second quadrant located in the upper left corner, and a second quadrant located in the lower left corner in a coordinate plane composed of a vertical Y axis and a horizontal X axis centered on the central axis when viewed from the front. It has an annular space spanning four quadrants, the third quadrant and the fourth quadrant located at the bottom right .
The through hole is
located in the second quadrant of the coordinate plane in the airflow swirling direction in the swirling chamber,
The separation chamber is
having a curved surface along the outer periphery of the cylindrical body of the space dividing plate in the third and fourth quadrants of the coordinate plane , and parallel to the axis of the coordinate plane in the first and second quadrants, respectively; It has two planes,
The two planes parallel to the axis of the coordinate plane are
comprising a separation chamber side surface that is a side surface of the separation chamber parallel to the Y axis and a separation chamber top surface that is a top surface of the separation chamber parallel to the X axis;
A cross section of a plane that includes the central axis and intersects the separation chamber is:
increasing the cross-sectional area toward the top surface of the separation chamber in a range that includes the side surface of the separation chamber in the cross section;
The bottom surface of the separation chamber, which is the bottom surface of the separation chamber, is
comprising the curved surface that is a concentric circle of the space dividing plate or a continuous surface of the curved surface and an inclined surface, in which the side surface of the separation chamber is raised when viewed from the front ;
located on the outer peripheral side of the space dividing plate with respect to the central axis;
forming the separation chamber between the space dividing plate;
The cyclone separation device is formed at a higher position than the outlet, and has a downward slope from the lower end of the continuous surface toward the outlet provided at the bottom . The housing has a hexahedral shape,
The four side surfaces adjacent to the back surface of the casing on the back side of the casing are each provided with the inflow port which opens from the square separator to the back surface and communicates with the swirling flow generating means. is,
The space dividing plate, the bottom surface of the separation chamber, the top surface of the separation chamber, the side surface of the separation chamber, and the discharge port are arranged on the front side of the casing, respectively,
2. The cyclone separation device according to claim 1 , wherein a portion of the inner wall surface of the casing on the front side with the square separator as a boundary is formed by the separation chamber top surface and the separation chamber side surface. The discharge section is
provided so as to protrude from the lower side surface of the housing,
a discharge promoting surface that is continuous with the bottom surface of the separation chamber and is provided symmetrically across the discharge port ;
The distal end includes the discharge port,
In the discharge section,
3. The cyclone separation device according to claim 1, wherein the discharge promoting surface is inclined in a direction in which the horizontal cross-sectional area of the discharge portion becomes smaller toward the bottom.

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