JP2019027657A - Ventilation port hood - Google Patents

Abstract

To suppress deterioration of separation performance and to facilitate assemblability in a ventilation port hood.SOLUTION: At an outer peripheral part on a bottom surface side of a ventilation port hood 1 of a space division plate 9, a ring-like contact surface 20 is provided. The contact surface 20 has a conical surface so that a diameter on a top surface side of the ventilation port hood 1 becomes smaller. The contact surface 20 is brought into a close contact with an inner peripheral surface of a cover via a packing 19. Thus, unnecessary inflow of the outside air into a separation chamber 11 can be prevented, so that deterioration in separation performance can be suppressed and assemblability can be facilitated.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vent hood that is attached to an air intake port of a building outdoor wall that places a blower on the downstream side of an air flow and takes outdoor air into the room in order to ventilate the room.

  In order to prevent wind and rain from entering the room through the duct when so-called air supply that takes outdoor air into the room, a hood is provided at the ventilation port that is the air intake port on the outer wall of the house to prevent the entry of wind and rain. In general, a hood such as that disclosed in Patent Document 1 is used as an example.

  At this time, since foreign substances such as insects enter the room at the same time, in Patent Document 1, a net or the like is provided in the vent hood to prevent the entry of foreign substances.

  However, if a net or the like is used, clogging will occur due to foreign matter, and if the maintenance is not performed, the ventilation airflow will be reduced. is there. This is because outside air flows in from the inflow port, a swirling airflow is generated by fixed blades provided at the inflow port, a through-hole penetrating the separation chamber is provided on the wall surface of the swirl chamber, and the centrifugal force due to swirling causes The foreign matter is moved and accumulated in the separation chamber, and the air from which the foreign matter has been removed flows out from the outlet and is supplied into the chamber.

  In any of the above, a blower is disposed on the downstream side of the vent hood, the vent hood and the blower are connected by a duct, and air is taken into the room.

JP 2011-242081 A JP 2008-36579 A

  In such a vent hood used for supplying air, a blower is disposed on the downstream side of the vent hood, so that the inside of the vent hood has a negative pressure lower than that of the surrounding outside air. Therefore, air flows into the inside from the opening of the vent hood.

  In the vent hood with the function of separating foreign matter using the cyclone technology as in Patent Document 2 above, if there are many gaps in the separation chamber for separating foreign matter, the outside air enters the inside and penetrates there. A flow toward the outlet through the hole is generated. This flow is in a direction opposite to the direction in which the foreign matter moves from the swirl chamber to the separation chamber, so that the foreign matter is prevented from moving into the separation chamber, and the foreign matter enters the room from the outlet without being separated.

  Therefore, an object of the present invention is to provide a vent hood that prevents the outside air from flowing into the separation chamber while using the cyclone technology, suppresses the deterioration of the separation performance, and is easy to assemble.

And in order to achieve this purpose, the vent hood according to the present invention is:
Ventilation hood that has a substantially cylindrical shape inside, the top surface is covered with a cup-shaped cover, and the bottom surface is closed with a base plate. The inside of the cover is divided into an inner swirl chamber and an outer separation chamber A space dividing plate, an inlet connected to the bottom side of the cover, an inner tube provided through the base plate and communicating with the swirl chamber and the outside, the cover including the bottom surface A cup-shaped internal space that is open on the side and closed on the top surface side, and the cover has a discharge port that allows the separation chamber and the outside to communicate with each other. There is a shielding plate that blocks airflow in the vicinity, the base plate is provided so as to block the bottom surface side of the inflow port, and the inflow port has a structure capable of generating a swirl airflow in the swirl chamber, The inner tube extends from the base plate into the swivel chamber, The inner cylinder inlet through which air flows in the swirl chamber side and the outlet through which air flows out from the outer side, the space dividing plate, a through hole for communicating the swirl chamber and the separation chamber, and the bottom surface A ring-shaped contact surface on the outer peripheral portion of the side, the contact surface is a conical surface with a small diameter on the top surface side, and the contact surface and the inner peripheral surface of the cover are packed together In this way, the intended purpose is achieved.

  According to the present invention, the space dividing plate has a ring-shaped contact surface on the bottom surface side of the ventilation port hood, and the contact surface has a conical surface whose diameter on the top surface side of the ventilation port hood is reduced. In the separation chamber of the space surrounded by the space dividing plate and the cover, the contact surface and the inner peripheral surface of the cover are in close contact with each other through the packing. Since a gap is filled between the covers by packing, it is possible to suppress the outside air from flowing into the separation chamber from between the space dividing plate and the cover, and it is possible to suppress a decrease in separation performance.

  In addition, the contact surface is a conical surface, that is, an inclined surface that reduces the diameter on the top surface side, so that the contact area with the packing increases and the outside air surely flows into the separation chamber. Can be suppressed.

  In addition, when the abutment surface is inclined, when assembling the vent hood, the space dividing plate is placed in the cover after the packing is applied to either the cover or the abutment surface. Although it will be inserted, in either case, the packing is smoothly fitted by the effect of the inclination, and the sealing property can be easily obtained.

1 is an external perspective view of the ventilation hood according to Embodiment 1 of the present invention as viewed from the top side. Sectional view along the same central axis Part A enlarged view of FIG.

The vent hood according to claim 1 of the present invention is:
Ventilation hood that has a substantially cylindrical shape inside, the top surface is covered with a cup-shaped cover, and the bottom surface is closed with a base plate. The inside of the cover is divided into an inner swirl chamber and an outer separation chamber A space dividing plate, an inlet connected to the bottom side of the cover, an inner tube provided through the base plate and communicating with the swirl chamber and the outside, the cover including the bottom surface A cup-shaped internal space that is open on the side and closed on the top surface side, and the cover has a discharge port that allows the separation chamber and the outside to communicate with each other. There is a shielding plate that blocks airflow in the vicinity, the base plate is provided so as to block the bottom surface side of the inflow port, and the inflow port has a structure capable of generating a swirl airflow in the swirl chamber, The inner tube extends from the base plate into the swivel chamber, The inner cylinder inlet through which air flows in the swirl chamber side and the outlet through which air flows out from the outer side, the space dividing plate, a through hole for communicating the swirl chamber and the separation chamber, and the bottom surface A ring-shaped contact surface on the outer peripheral portion of the side, and the contact surface is a conical surface having a smaller diameter on the top surface side, and the contact surface and the inner peripheral surface of the cover are packing. It has the structure of having made it closely_contact | adhere through.

  As a result, in the separation chamber, which is a space surrounded by the space dividing plate and the cover, a gap is filled between the contact surface and the cover by the packing, so that outside air flows between the space dividing plate and the cover. It is possible to prevent the separation performance from being lowered.

  In addition, the contact surface is a conical surface, that is, an inclined surface whose diameter on the top surface side becomes small, so that the contact area with the packing increases, and the outside air is reliably prevented from flowing into the separation chamber. be able to.

  In addition, when the contact surface is inclined, when assembling the ventilation hood, the space dividing plate is inserted into the cover after the packing is attached to either the cover or the contact surface. However, in either case, the packing is smoothly fitted by the effect of the inclination, and the sealing property can be easily obtained.

  The packing is affixed to an inner surface of the cover, and a flange portion projecting to the outer peripheral side is provided on the bottom surface side of the space dividing plate, and the inflow port includes a plurality of plate-like members. The flange portion is provided with a contact rib projecting toward the top surface, and the contact rib is in contact with the outer peripheral surface of the contact rib. It is good also as a structure used as a surface.

  Thereby, the clearance gap between an inflow port and a space division board can be eliminated because an inflow port and a space division board are made into an integral composition. If there is a gap between the inlet and the space dividing plate, an airflow passing through the gap is generated without passing through the plate-like member portion for turning the airflow, and the swirling airflow inside the swirling chamber Becomes weaker, the centrifugal force applied to the foreign matter is weakened, and the separation performance of the foreign matter is lowered. In addition, since the inflow port and the space dividing plate are integrally configured, an extra space can be reduced as compared with the case where the inflow port and the space dividing plate are configured as separate members, which leads to downsizing of the vent hood.

And even in such a configuration, when incorporating the space dividing plate integrated with the inflow port into the cover,
Since the contact rib is inclined as a conical surface, the packing affixed to the inner surface of the cover is gradually pressed down. And a reduction in separation performance can be suppressed.

  Further, the space dividing plate may have a truncated cone shape with a diameter decreasing toward the top surface side so as to be in the same inclination direction as the contact surface.

  As a result, even if the swirling airflow in the swirl chamber moves away from the inlet and the flow velocity of the swirling airflow decreases, the diameter of the inner portion of the swirling chamber decreases toward the top surface away from the inlet. Decrease in centrifugal force applied to can be suppressed. Thereby, the fall of separation performance can be controlled.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 shows a vent hood 1 in the present embodiment. The ventilation opening hood 1 is obsessed with an air supply opening that is an air intake opening on the outer wall of the house when outdoor air is taken into the house. A blower is installed in the house, the blower and the vent hood 1 are connected using a ventilation duct, and outdoor air is taken in and supplied to the room.

  FIG. 1 is a top external perspective view of the vent hood 1 and is a view seen from the outdoor side when attached to the outer wall of a house. The central axis 26 is horizontal. FIG. 2 is a cross-sectional view of the vent hood 1. The outlet 8 is connected to a ventilation duct, and a blower is connected downstream thereof.

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

  As shown in FIG. 2, the vent hood 1 of the present embodiment is attached to the outer wall surface of the house with the central axis 26 substantially horizontal. In the present embodiment, the left side in FIG. 2 is the top side of the vent hood 1 and the cover 2 is provided. On the other hand, the right side in FIG. 2 is the bottom side of the vent hood 1 and a base plate 3 is provided. The upper and lower portions of the cover 2 are provided with upper and lower protruding plates 4 that are curved along the circular shape of the cover 2, thereby connecting the cover 2 and the base plate 3. The internal space that can be formed by connection is cylindrical.

  The cover 2 has a rotating body shape formed by rotating around the central axis 26, and has a dome shape protruding toward the top surface side. The dome shape is one form of a cup shape, but the cover 2 may have another cylindrical shape.

  The cover 2 and the base plate 3 are connected via the protruding plate 4. Thereby, a gap is provided between the cover 2 and the base plate 3 to form the inflow port 6. The inflow port 6 is configured to be in contact with the base plate 3 on the side surface of the vent hood 1 and is configured to allow air to flow in approximately 360 degrees around the central axis 26. The part is a shielding part, and air does not flow in.

  The inflow port 6 is provided with a plurality of fixed blades 5 that are plate-like members arranged obliquely toward the central axis 26 so that the inflowing air turns. In other words, the fixed blade 5 is provided at a predetermined angle in the same direction with respect to the tangent of the arc centered on the central axis 26 in the cross section orthogonal to the central axis 26.

  As shown in FIG. 1, a discharge port 7 is provided in a portion located in the lower part of the cover 2.

  Next, the internal structure of the vent hood 1 will be described with reference to FIG.

  The inside of the cover 2 is divided into a swirl chamber 10 and a separation chamber 11 by a space dividing plate 9, and the separation chamber 11 has an annular shape and surrounds the swirl chamber 10. The space dividing plate 9 includes a through hole 12, and the swirl chamber 10 and the separation chamber 11 are spatially connected via the through hole 12.

  The space dividing plate 9 has a sectional area (a surface perpendicular to the central axis 26) of the swirl chamber 10 that decreases from the end on the inlet 6 side, that is, the end on the fixed blade 5 side, toward the top surface of the cover 2. The space formed in the gap between the space dividing plate 9 and the cover 2 is the separation chamber 11.

  As shown in FIG. 2, the base plate 3 is provided with a circular opening in the center so as to be coaxial with the central axis 26, and a cylindrical inner tube 13 is provided so as to pass through the opening. Yes. The inner side of the ventilation hood 1 of the inner tube 13 is an inner tube inlet 14 through which air flows into the inner tube 13 and the outer side is an outlet 8 through which air flows out. In the cross-sectional view of FIG. 2, the inner cylinder inlet 14 extends in the direction of the central axis 26 up to a position overlapping the space dividing plate 9 when viewed in the direction perpendicular to the paper surface.

  The discharge port 7 is an opening provided on the side surface of the cover 2 so that the central shaft 26 is positioned at the lower part in the gravitational direction when the central axis 26 is in a horizontal state. The discharge port 7 is a rectangular opening that is long in the direction of the central axis 26, and the outside and the separation chamber 11 are spatially connected.

  In the separation chamber 11, a lower shielding plate 15 and an upper shielding plate 16 are provided. A plurality of lower shielding plates 15 are provided near the discharge port 7 on the through-hole 12 side, and the upper shielding plate 16 is located in the upper part in the gravity direction. It is prepared as follows. The lower shielding plate 15 and the upper shielding plate 16 are provided in the separation chamber 11 radially about the central axis 26. These shielding plates do not completely separate the separation chamber, but leave a gap between the lower shielding plate 15 and the upper shielding plate 16 with the cover, and foreign substances and air can come and go. . A plurality of lower shielding plates 15 are provided between the discharge port 7 and the through hole 12. In the present embodiment, the space dividing plate 9, the plurality of fixed blades 5, the lower shielding plate 15, and the upper shielding plate 16 are integrated.

  Next, the separation mechanism will be described.

  The outdoor air containing foreign matter flows into the ventilation hood 1 from the inlet 6, turns into a swirling airflow by the fixed blade 5, and swirls in the swirl chamber 10 toward the top side of the ventilation hood 1. Here, the foreign matter moves to the outer peripheral side of the swirl chamber 10 by centrifugal force, that is, the space dividing plate 9 side, and moves to the separation chamber 11 by centrifugal force when passing through the vicinity of the through hole 12. The air from which the foreign matter has been separated flows into the inner tube 13 and flows out of the apparatus through the outlet 8.

  The foreign matter that has moved to the separation chamber 11 is temporarily stored in the separation chamber 11. Since the ventilation port hood 1 has a negative pressure by the blower, air flows into the separation chamber 11 from the discharge port 7. The air flowing into the separation chamber 11 from the outside tends to go to the through-hole 12 provided in the space dividing plate 9, but the airflow is blocked by the lower shielding plate 15 and the upper shielding plate 16, and the air is discharged from the outlet 7. Only a small amount flows in. The slight air flows from the separation chamber 11 through the through hole 12 and flows into the swirl chamber 10 and merges with the swirling airflow in the swirl chamber 10.

  On the other hand, when natural wind blows on the outdoor side of the discharge port 7, the static pressure on the outdoor side of the discharge port 7 decreases. When the static pressure on the outdoor side of the discharge port 7 becomes lower than the static pressure on the separation chamber 11 side, the separated foreign matter is pulled out outdoors. Thereby, since a foreign material is automatically discharged | emitted outdoors, a foreign material does not continue to accumulate in the separation chamber 11, and the maintenance which removes a stored material can be made unnecessary.

  Next, the characteristic part in this Embodiment is demonstrated.

  FIG. 3 is an enlarged view of a portion A in FIG. 2, in which a part integrated with the space dividing plate 9 is to be fitted into the cover 2 to which the packing 19 is attached.

  The base plate 3 side of the space dividing plate 9 is provided with a flange portion 17 protruding outward, and the fixed blade 5 is erected on the base plate 3 side from the flange portion 17 and is integrated with the space dividing plate 9. Furthermore, a cylindrical contact rib 18 is provided at the outer peripheral end of the flange portion 17 so as to stand up toward the top surface side of the vent hood. The outer peripheral surface of the contact rib 18 is a contact surface 20 that comes into contact with a packing 19 to be described later, and the contact surface 20 is a conical surface whose diameter decreases toward the top surface side of the vent hood 1. . The inclination direction of the contact surface is the same as the inclination direction of the truncated conical space dividing plate 9.

  And as shown in FIG. 2, the packing 19 is affixed inside the cover 2. As shown in FIG. The inner diameter of the packing 19 is set so as to be smaller than the outer diameter of the contact rib 18.

  When assembling the vent hood 1 of the present embodiment, the space dividing plate 9 (part in which the fixed blade 5, the upper shielding plate 16, and the lower shielding plate 15 are integrated) is inserted into the cover 2, and the upper and lower protrusions are inserted. The structure is fixed to the plate 4.

  Since the outer diameter of the contact rib 18 on the tip side (the top surface side of the vent hood) is slightly larger than the inner diameter of the attached packing 19 (it may be the same as or smaller than the inner diameter of the packing 19), the space dividing plate When fixing 9 to the cover 2, it is easy to fit the space dividing plate 9 into the cover 2. When the space dividing plate 9 is further inserted, the packing 19 is gradually crushed along the inclination of the contact surface 20 of the contact rib 18, so that the packing 19 is crushed smoothly and the seal is kept tight. be able to.

  Although not shown in the drawing, a wire net or the like may be provided at the inlet 6 portion in order to prevent large insects from entering from the inlet 6. That is, a cylindrical wire mesh may be provided so as to cover the inflow port 6. The wire mesh provided at the inflow port 6 has substantially the same diameter as the inner diameter of the cover 2, and the space dividing plate 9 may be inserted after the wire mesh is connected to the cover 2 side in advance. In this case, the packing 19 may be attached to the inner peripheral side of the cover 2. That is, when the packing 19 is attached to the space dividing plate 9 side, the packing 19 needs to have a thickness that makes the outer diameter of the packing 19 larger than the inner diameter of the cover 2. If the space dividing plate 9 is to be inserted into the cover 2 in this state, the packing 19 provided so as to swell toward the outer peripheral side is caught by the tip of the wire mesh, making assembly very difficult. Therefore, the packing 19 is preferably attached to the cover 2 side. When the packing 19 is affixed to the cover 2 side, when the space dividing plate 9 is inserted, the abutment surface 20 is an inclined surface, so that the packing 19 can be gradually crushed, and assembly is easy. Become.

  In this way, by sealing the space between the separation chamber 11 and the cover 2 with the packing 19, the communication portion between the separation chamber 11 and the outside can be the discharge port 7 only. That is, the air directly flowing into the separation chamber 11 from the outside air is only the discharge port 7, so that an increase in the flow of the through hole 12 from the separation chamber 11 to the swirl chamber 10 can be prevented. Since the movement of the foreign matter to the chamber 11 can be prevented from being hindered, a decrease in separation performance can be suppressed. Moreover, since the outside air flowing in from the discharge port 7 suppresses the flow toward the through hole 12 by the lower shielding plate 15 and the upper shielding plate 16, it does not affect the separation performance.

  That is, since it can suppress that external air flows into the separation chamber 11 from the clearance gap between the space division board 9 and the cover 2, the fall of separation performance can be suppressed. Since the contact surface 20 in contact with the packing 19 is a conical surface, the packing 19 can be gradually crushed during the assembly, so that the assembly is facilitated and the inclined contact surface 20 is inclined. Since the packing 19 is pressed down firmly, the sealing performance is also improved.

  The vent hood according to the present invention prevents outside air from flowing into the separation chamber, can suppress a decrease in separation performance, can separate foreign matter without causing clogging, Since clean air can be supplied, it is useful, for example, as a vent hood attached to an air supply port on the outer wall of a house, or for removing foreign matter from other air supply portions.

DESCRIPTION OF SYMBOLS 1 Ventilation hole hood 2 Cover 3 Base plate 4 Projection plate 5 Fixed blade 6 Inlet 7 Outlet 8 Outlet 9 Space dividing plate 10 Swivel chamber 11 Separation chamber 12 Through-hole 13 Inner tube 14 Inner tube inlet 15 Lower shielding plate 16 Upper shielding plate 17 Flange portion 18 Contact rib 19 Packing 20 Abutting surface 26 Central axis

Claims (3)

A vent hood that has a substantially cylindrical shape inside, the top surface is covered with a cup-shaped cover, and the bottom surface is closed with a base plate.
A space dividing plate that divides the inside of the cover into a swirl chamber on the inner peripheral side and a separation chamber on the outer peripheral side;
An inlet connected to the bottom side of the cover;
An inner tube provided through the base plate and communicating with the swirl chamber and the outside;
The cover has a cup-shaped internal space that opens on the bottom surface side and closes the top surface side, and the cover has a discharge port that allows the separation chamber to communicate with the outside.
A shielding plate that blocks airflow in the vicinity of the outlet in the separation chamber;
The base plate is provided so as to close the bottom surface side of the inflow port,
The inflow port has a structure capable of generating a swirl airflow in the swirl chamber,
The inner tube extends from the base plate into the swirl chamber, has an inner tube inlet through which air flows into the swirl chamber side, and an outlet through which air flows out from the outer side,
The space dividing plate has a through hole for communicating the swirl chamber and the separation chamber, and a front ring-shaped contact surface on an outer peripheral portion on the bottom surface side,
The abutment surface is a conical surface with a small diameter on the top surface side,
A vent hood in which the contact surface and the inner peripheral surface of the cover are in close contact with each other through packing. The packing is affixed to the inner surface of the cover,
Provided on the bottom side of the space dividing plate is a flange portion projecting to the outer peripheral side,
The inflow port has a plurality of plate-like members erected on the bottom surface side of the flange portion, and is configured integrally with the space dividing plate,
Provided on the outer peripheral end of the flange portion is a contact rib protruding to the top surface side,
The ventilation hood according to claim 1, wherein an outer peripheral surface of the contact rib is the contact surface. The vent hole hood according to claim 2, wherein the space dividing plate has a truncated cone shape whose diameter decreases toward the top surface so as to be in the same inclination direction as the contact surface.

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