JP3508632B2 - Tornado-type intake / blower - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generates spiral swirling vortices in opposite directions inward and outward in the outer blowing direction and the inner sucking direction to prevent air in a predetermined local region from diffusing to the surroundings. The present invention relates to a so-called tornado type intake / blower device capable of effectively inhaling air.

[0002]

2. Description of the Related Art Recently, for example, as shown in FIG. 8, as an effective ventilation method for efficiently inhaling polluted air in a predetermined local area of a room without diffusing it into the surroundings and discharging it out of the room. While the two ducts of the exhaust duct 2 and the air supply duct 5 are installed so as to penetrate from the room to the outdoors, the air intake port 1a for exhaust is correspondingly provided.
A frusto-conical exhaust hood 1 and a dome-shaped air supply chamber 4 having a downward air outlet 3 are provided in a two-layer structure of the inside and outside, and the exhaust duct 2 and the exhaust are provided at the center of the top plate portion 1b of the exhaust hood 1. The air intake port 1a for air supply, and the air supply inlet 5a of the air supply duct 5 and the air supply swirl space 4c in the upper part of the air supply chamber 4 in an oblique tangential direction. A swirling flow generation stator 3a provided to surround the exhaust air suction port 1a on the lower surface of the air supply chamber 4 with the outside air introduced into the air supply swirl space 4c of the air supply chamber 4 through the air introduction port 5a, from the air outlet 3 with 3a · · · to form a swirling vortex F ₁ of the air curtain by blowing while swirling spirally around the outer periphery of the predetermined local region, the air in revolving vortex F ₁ Local area Air is sucked in the direction of the air intake port 1a for exhaust, which is opposite to the air blown to the outside, and rises in a tornado shape in the direction of the air intake port 1a for exhaust due to the negative pressure of the intake air during the intake. A so-called tornado type intake / blower device that generates an intake swirling vortex F ₂ for effective ventilation has been proposed (for example, Japanese Patent Application No. 11-131).
041).

[0003]

However, the tornado type air intake / blowing device having the above-mentioned structure has the following problems.

That is, in the configuration of FIG. 8, the air suction port 1
Since a and the air outlet 3 are adjacent to each other on the lower side of the air supply chamber 4, a centrifugal force due to the swirling flow causes a radial outward velocity component to the intake swirling vortex F ₂ in the vicinity of the air suction port 1 a. There was a case where polluted air such as oily smoke easily leaked due to increase in air pollution.

The present invention has been made in order to solve such a problem, and blows out a part of the air toward the air suction port to cancel out the velocity component of the intake swirl flow outward in the radial direction. It is an object of the present invention to provide a tornado type air intake / blower that stabilizes the intake performance by increasing the degree of convergence.

[0006]

In order to achieve the above object, the present invention comprises the following means for solving problems.

(1) Invention of Claim 1 In the tornado type air intake / blower of the present invention, an air suction port 1a for sucking in and exhausting air in a predetermined local region in a tornado shape.
And an air outlet 3 which is provided so as to surround the air inlet 1a and blows air downward while swirling the air, and a part of the air blown out from the air outlet 3
How to swirl the air flow blown from the air outlet 3
Swivel in the same direction as the
The feature is that the flow is divided.

Therefore, in this structure, the air suction port is
The intake swirling vortex flow F ₂ that rises while swirling like a tornado and is sucked into the air suction port 1a by the split component in the direction 1a
The velocity component outward in the radial direction is cancelled, the vector in the centripetal direction increases, and the degree of convergence increases, so the intake performance is stabilized.

Moreover, in that case, the air suction
The air flow split in the direction of the mouth 1a is the air outlet 3
It is swirled in the same direction as the swirling direction of the air flow blown out from
It is designed to be split.

As a result, from the air outlet 3 in the spiral direction
A part of the airflow blown to the same direction as the turning direction
Air inward in the radial direction with a swirling velocity component in the opposite direction
Since it is divided in the direction of the inlet 1a, it is smoother and more effective.
The velocity component outward in the radial direction can be canceled out.

(2) The invention according to claim 2 The tornado type air intake and blower according to the present invention comprises:
In the configuration of the 1 Symbol placement of invention, the air outlet of the air plenum 3 is diverted to divert an air flow blown out into a downward air flow toward the side floor direction and the air flow toward the air inlet 1a direction A member 10 is provided, and a part of the air blown out from the air outlet 3 by the flow dividing member 10 is divided in the direction of the air suction port 1a.

Therefore, in this configuration, the air flow in the direction of the air inlet 1a split by the flow dividing member 10 effectively cancels the velocity component outward in the radial direction in the intake swirl vortex, and the intake swirl vortex with a high degree of convergence is obtained. Can be formed.

(3) The invention according to claim 3 In the tornado type air intake / blowing device of the present invention, the air suction port 1a for sucking the air in the predetermined local region in a tornado shape and discharging it.
And a tornado type air intake / blowing device which is provided so as to surround the air suction port 1a and blows air downward while swirling the air. with Keru set an auxiliary air outlet 13 for blowing air into the air inlet 1a directions there between mouth 1a, the from the auxiliary air outlet 13
The air flow blown toward the air intake port 1a is
The same as the swirling direction of the air flow blown out from the air outlet 3.
The feature is that it is swung in the same direction and blown out.

Therefore, according to this structure, the velocity component of the intake swirling vortex flow outward in the radial direction is canceled by the air flow blown from the auxiliary air outlet 13 toward the air suction port 1a to improve the centripetal force and increase the degree of convergence. be able to.

Moreover, in that case, the above-mentioned auxiliary air
It is blown out from the suction port 13 toward the air suction port 1a.
The air flow that is generated is the rotation of the air flow blown from the air outlet 3.
It turns into the same direction as the turning direction and it is blown out.
ing.

As a result, the air from the auxiliary air outlet 13 is emptied.
The air flow blown in the direction of the air suction port 1a is
The same swirling component as the swirling direction of the air flow blown out from 3
While being accompanied, it is blown into the air intake port 1a and is it smooth?
Effectively injects the velocity component of the intake swirl vortex outward in the radial direction.
It can be erased.

[0017]

As a result of the above, according to the tornado type intake / blower of the present invention, the degree of convergence of the intake swirling vortex is improved, the intake performance is stabilized, and the ventilation or the circulation of the inside air can be performed efficiently. Like

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) FIGS. 1 to 5 show the configuration of a tornado type intake / blower device according to Embodiment 1 of the present invention applied to a ventilation device.

The tornado type air intake / blowing device 1 is provided, for example, above a cooking device such as a gas table in a kitchen of a general household or a commercial kitchen of a restaurant as a predetermined local area such as a gas table. The outer periphery of the device is wrapped in an air curtain shape by a spiral swirling vortex flow from the upper side to the lower side by the outside air introduced from the outside, while it is exhausted toward the center part of the air curtain spiral spiral swirling flow. The suction negative pressure causes a tornado-shaped intake swirl vortex that is generated upward in the air curtain-shaped spiral swirl vortex to be formed, and the smoke generated from the heating cooker or the like by the tornado-shaped inspiratory swirl vortex. It is designed so that odors and odors can be efficiently sucked and exhausted to the outside of the room.

In the figure, reference numeral 4 is, for example, a dome-shaped air supply chamber provided above the source of polluted air such as odors and smoke. A small truncated cone-shaped exhaust hood 1 is provided integrally with the plate portion 4a so as to extend to the lower end side opening surface position of the air supply chamber 4 with a predetermined gap. As a result, the outside air sucked between the air supply chamber 4 and the exhaust hood 1 inside the air supply chamber 4 through the air supply duct 5 described later is effectively swirled as shown by the arrow while the air outlet 3 is directed. The air supply swirl space 4c is formed in which the passage diameter is gradually increased in the centrifugal direction.
A swirling vortex with a predetermined flow velocity is formed in advance with respect to the air flow supplied to the. In addition, this air supply turning space 4
Inside c, if necessary, a straightening vane located outside the upper side of the exhaust hood 1 for straightening the swirling flow formed as described above is provided. The current plate is formed of, for example, a punching plate.

Further, the top plate portion 4 of the air supply chamber 4
On the a side, a curved air supply inlet 5a at the tip of the air supply duct 5 is provided to introduce outside air in a diagonal tangential direction (swirl direction), and at the center of the top plate portion 1b of the exhaust hood 1. The exhaust ducts 2 introduced through the top plate portion 4a of the air supply chamber 4 are connected in a communicating state, and their outside air intake ends and inside air discharge ends extend outside the door. An air supply fan and an exhaust fan, which are, for example, a multi-blade fan (sirocco fan), are provided at the ends of the air supply duct 5 and the exhaust duct 2 that extend outside the room (not shown). To supply air,
The exhaust action is realized.

By the way, in the case of this embodiment, the air outlet 3 is located between the lower end 6 of the side wall portion 4b having the same diameter on the lower side of the air supply chamber 4 and the lower end of the exhaust hood 1 and is continuous in the circumferential direction. Is opened in the middle portion of the thick decorative panel 8 provided and is obliquely formed with a predetermined inclination angle whose diameter increases from the upper position to the lower position of the decorative panel 8. . In the air outlet passage portion, swirl flow generation stators 3a, 3a, ... Having a predetermined inclination angle are arranged side by side in the circumferential direction at a predetermined interval in the spiral direction.

On the outer peripheral surface side of the air outlet passage of the air outlet 3, an airflow guide 7 of a predetermined length is provided extending in the airflow outlet direction, and the divergence angle of the outlet airflow outward in the radial direction. Are regulated to an appropriate size.

On the other hand, at the air outlet portion of the air outlet 3, annular flow dividing members 10 having a triangular cross section as shown in FIG. 4 are arranged at predetermined intervals so as to correspond to the entire circumferential direction. Has been done.

As shown in the figure, the flow dividing member 10 has an inclination angle on the outer peripheral surface 10a side with respect to the apex (ridge line portion) of a triangle, which corresponds to the inclination angle of the air outlet 3. On the other hand, the inclination angle on the inner peripheral surface 10b side is gentler than that, and the lower end portion on the inner peripheral surface 10b side is extended inward in the radial direction by a predetermined dimension in a substantially horizontal state. The flange portion 11 is provided. The triangular vertex (ridge line portion) of the flow dividing member 10 is provided so as to be displaced inward by a predetermined dimension from the center axis extension line of the air outlet passage of the air outlet 3, and the air outlet 3 is provided. While a large diameter and a large amount of air swirl downward in the air outlet flow path downstream from the outlet part of the main flow passage 21 and a small diameter and a small amount of air swirl in the same direction as the air flow of the main flow passage 21. It is divided into two channels, an auxiliary channel 22 flowing in the direction of the air inlet 1a by the guide action of the flange 11.

Therefore, in the above configuration, when, for example, the air supply fan on the side of the air supply duct 5 and the exhaust fan on the side of the exhaust air duct 2 are driven in the state of FIG. 1, the air supply duct 5 is first passed through. Outside air introduced to the air supply inlet 5a by
It is blown out in the turning direction in the air supply turning space 4c by the air supply fan. Then, while being efficiently swirled in the same air supply swirl space 4c, it is rectified by, for example, a rectifying plate, and becomes a stable swirl vortex with a uniform flow velocity and is supplied to the air outlet 3 on the lower surface of the air supply chamber 4. Then, when passing through the air outlet passage of the air outlet 3, the swirling flow generating stators 3a, 3a, ... Give a larger vector in the swirling direction, resulting in a stronger spiral swirling airflow. The airflow is diverted by the flow diverting member 10 and is blown out in an oblique direction toward the outer periphery of the cooking device in the lower local area through the main flow path 21, while the air intake port is radially inward through the auxiliary flow path 22. It is blown out substantially horizontally toward the direction 1a (see F ₁ and F ₃ in the figure).

As a result, an air curtain for surrounding the smoke and odor emitted from the cooking device so as not to diffuse to the surroundings is formed by the downward spiral spiral blown air flow F ₁ and its central axis. Inward of the direction, a swirling intake of a large tornado-like suction force that rises upward from below by the suction force of the exhaust fan toward the exhaust air intake port 1a in the exhaust hood 1 on the exhaust duct 2 side opposite to that direction. Flow F
₂ is formed.

Then, this tornado-like intake swirling vortex F
_2, tries to leak to the outside component of velocity radially outwardly is increased by the action of centrifugal force in the vicinity of the air inlet 1a as already mentioned, the auxiliary flow as described above in the region through the road 22 is blown out radially inner air suction port 1a direction blowout airflow F ₃ of a predetermined amount of the same turning direction as the outlet air flow F ₁ into the downward over the entire circumference (see FIG. 5),
As a result, the velocity component to the outside in the radial direction is canceled out, and the velocity component is appropriately converged in the central axis direction in the air suction port 1a.
Therefore, the intake performance is stable, and unlike the conventional case, it is unlikely to leak to the outside.

As a result, it becomes possible to more reliably exhaust and clean the air contaminated with smoke, odor, and the like in the heating cooker portion surrounded by the air curtain composed of the spiral blown swirling airflow F ₁ .

(Second Embodiment) Next, FIG. 6 shows a configuration of a tornado type intake / blower device according to a second embodiment of the present invention applied to a ventilation device.

As in the configuration of the first embodiment described above, the air outlet 3 and the main,
When the two auxiliary channels 21 and 22 are provided, the decorative panel 8 for providing the air outlet 3 and the like in addition to the sufficiently large diameter of the air inlet 1a under the exhaust hood 1
However, the outer diameter of the outside air blowing chamber 4 becomes large, and the apparatus cannot be made compact. Moreover, the structure of the air outlet 3 is locally complicated.

Therefore, in the configuration of this embodiment, the wall thickness of the side wall portion 4b of the air supply chamber 4 is increased, and the side wall portion 4b portion has a swirling flow generating stator 3a similar to that of the first embodiment. , 3a ... By providing the annular air outlet 3 with the annular air outlet 3, the device is first made compact, while between the outer peripheral edge 1c of the exhaust hood 1 and the lower edge of the side wall 4b of the air supply chamber 4. The auxiliary air outlet 13 is formed over the entire circumference, and a guide plate 9 for smoothly guiding a predetermined amount of air blown from the auxiliary air outlet 13 toward the air intake port 1a on the radially inner side is provided. It is a feature. Of course, also in this case, a swirl flow generation stator similar to the swirl flow generation stators 3a, 3a ... Is provided in the auxiliary air outlet 13 portion.

With such a structure, in the compact apparatus body, the degree of convergence of the intake swirling vortex flow F ₂ can be improved without complicating the structure of the air outlet 3 as in the first embodiment. It becomes possible to obtain the effect of stabilizing the intake performance.

(Confirmation of Effect of Intake Performance Stabilizing Action on Configuration of Each Embodiment) The intake performance stabilizing action in the case of adopting the configuration of each of the above embodiments is compared with that of the conventional configuration. When you look at it,
It looks like Figure 7.

In the graph of FIG. 7, the vertical axis represents the velocity component in the radial direction on the line showing the center and the outer periphery where the center side of the exhaust hood 1 is + and the outer peripheral side of the exhaust hood 1 is −. The horizontal axis represents the distance from the air intake port 1a of the exhaust hood 1 to the floor surface in the lower local area. In the case of the conventional exhaust hood 1, most of the intake swirling vortex that rises like a tornado is collected in the air intake port 1a of the exhaust hood 1 and flows into the exhaust duct 2, but the centrifugal force generated in the air intake port 1a is Since a velocity component outward in the radial direction is generated by the action (see the shaded portion), it is not possible to exhaust all of the ascending airflow, and a part of the exhaust component leaks from the exhaust hood 1 and goes outward. Occurs. Therefore, since the air flow is directed outward from the air intake port 1a of the exhaust hood 1 to a distance of D _{1 and} a negative suction pressure in the direction of the exhaust duct 2 acts between the distances of D ₁ and D _2. The airflow goes inward (center).

However, in each of the above-described embodiments, the flow of the airflow that leaks outward due to the action of the centrifugal force is entwined in the same direction by the swirl airflow F ₃ radially inward and the efficiency is inwardly increased. Since it is possible to flow the air well, the airflow is directed inward even at a distance D ₁ downward from the air inlet 1a of the exhaust hood 1. Further, even in the lower part of D ₁ or less, the flow toward the outside is reduced because the intake swirling vortex F ₂ is riding on the rising air flow.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a tornado type intake / blower device according to Embodiment 1 of the present invention.

FIG. 2 is a partially enlarged cross-sectional view (left side) showing a configuration of a main part of the apparatus.

FIG. 3 is a partially enlarged cross-sectional view (right side) showing a configuration of a main part of the apparatus.

FIG. 4 is a partially cutaway perspective view showing a configuration of a main part of the apparatus.

FIG. 5 is a bottom view showing the configuration of the device.

FIG. 6 is a cross-sectional view showing a configuration of a tornado type intake / blower device according to Embodiment 2 of the present invention.

FIG. 7 is a tornado type intake air in each of the above-mentioned embodiments.
It is a graph which shows the intake air stabilization performance of a ventilation device compared with a prior art example.

FIG. 8 is a cross-sectional view showing a configuration of a conventional tornado type intake / blower device.

[Explanation of symbols]

1 is an exhaust hood, 1a is an air inlet of the exhaust hood, 2 is an exhaust duct, 3 is an air outlet, 3a is a swirl flow generation stator, 4 is an air supply chamber, 4b is a side wall portion, 4c is an air supply swirl space, Reference numeral 5 is an air supply duct, 10 is a flow dividing member, 13 is an auxiliary air outlet, 21 is a main flow path, and 22 is an auxiliary flow path.

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F24F ^7/ 04-7/06

Claims (3)

(57) [Claims] 1. An air suction port (1a) for sucking and exhausting air in a predetermined local region in a tornado shape, and the air suction port (1).
a) is provided so as to surround the air outlet and blows air downward while swirling the air, and a part of the air blown from the air outlet (3) is
The swirling direction of the air flow blown out from the air outlet (3)
Turn in the same direction and move toward the air inlet (1a).
Features and to belt Runedo type intake and blowing device that it has to divert. 2. A shunt that splits the blown air flow into an air flow directed toward the lower floor surface and an air flow directed toward the air suction port (1a) at the air outlet portion of the air outlet (3). A member (10) is provided, and a part of the air blown out from the air outlet (3) by the flow dividing member (10) is divided in the direction of the air inlet (1a). The tornado type air intake / blowing device according to claim 1 . 3. An air suction port (1a) for sucking and exhausting air in a predetermined local region in a tornado shape, and the air suction port (1).
A tornado type air intake / blower device, which is provided so as to surround a) and has an air outlet (3) that blows air downward while swirling the air, wherein the air outlet (3) and the air inlet are provided. in the between (1a) the air inlet (1a) direction provided blow air auxiliary air outlet (13) Rutotomoni, the auxiliary air outlet (13)
Is blown out toward the air suction port (1a).
Air blown from the air outlet (3)
Let it swirl in the same direction as the swirling direction of the flow
Features and to belt Runedo type intake and blowing device that you.