JPH0560355A - Ventilation device of heating and cooking device - Google Patents

Abstract

PURPOSE:To improve a collecting efficiency of discharged air, to reduce an amount of air as much as possible and eliminate a certain disadvantage of noise and the like by a method wherein a cylinder having a bottom part therein with a plurality of penetrating holes is projected at a circumferential surface of a suction port. CONSTITUTION:A circular air suction port 4 is arranged at a rear vertical wall 2 of a heating and cooking device and a duct which is cooperatively arranged at the air suction port 4 is opened outside a house through an air discharging fan. A cylinder 7 having a bottom part therein with a plurality of penetrating holes 8 at its circumferential surface is projected from a circumferential edge of the air suction port 4. With such an arrangement, the substantial air suction port 4 is made into a cylindrical form and axially extended to cause air flow directed toward its radial direction, resulting in an eddy flow being easily generated. The circumferential speed of the eddy flow is sufficiently faster than that in a radial direction under a condition having no eddy flow, so that even if the entire air volume is reduced to half in volume, air speed in a lateral direction as one resisting sufficiently against a rising speed of the discharged air can be attained and it has an effect that the discharged air is enclosed in the eddy current, resulting in that the low noise can be attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation device for exhausting exhaust gas generated from a heating cooker to the outside.

[0002]

2. Description of the Related Art A conventional ventilator for a heating cooker collects exhaust gas generated from the gas cooker by means of a hood and an intake port provided above the gas cooker. Since it is overhanging, there is a feeling of pressure and there is a problem that it does not look neat. Therefore, recently, a method has been developed in which exhaust air is sucked and exhausted downward through an intake port provided at the rear part of the gas cooker. FIG. 6 shows a conventional example of this kind. An intake port 4 is provided in a rear standing wall 2 of the gas cooker 1, and a duct 5 connected to the intake port 4 is provided with an exhaust fan 6
It is opened to the outside through.

[0003]

However, since the above-described lower exhaust system tries to pull back the exhaust airflow that is originally heated and is rising, the required air volume is about 500 m ³ / h of the upper exhaust system. Compared with the above, it is a large amount of about 1000 m ³ / h, and as a result, problems such as wind noise of exhaust fans, whistling of mail, difficulty in opening and closing windows and doors, intrusion of drafts, increase in air conditioning load, etc. Was occurring. Therefore, an object of the present invention is to improve the exhaust gas collection rate in the lower exhaust system to reduce the required air volume and alleviate the above problems.

[0004]

DISCLOSURE OF THE INVENTION The present invention is directed to a heating cooker 3.
The rear standing wall 2 is provided with one or a plurality of circular intake ports 4, and a duct 5 connected to the intake ports 4 is connected to an exhaust fan 6
In a ventilator for a heating cooker that is opened to the outside through a through hole, a bottomed cylindrical body 7 having a through hole 8 is provided so as to project from the peripheral edge of the intake port 4 to the peripheral surface.

[0005]

By substantially distributing the air inlets on the cylindrical body and extending them in the axial direction, the air can be made to flow in the radial direction of the cylindrical body, and swirls can easily occur. Since the peripheral velocity of this vortex flow is twice to several times greater than its radial velocity, if this velocity is high enough to match the rising velocity of the exhaust gas, the exhaust gas will be discharged even if the radial velocity is low. The exhaust gas can be sufficiently sucked, and the exhaust gas trapping rate can be increased by confining the exhaust gas in the vortex flow.

[0006]

1 to 3 show an embodiment of a ventilator for a heating cooker according to the present invention. In the figure, 1
Is a gas cooker, a gas stove 3 is provided on the upper surface thereof, 2 is a rear standing wall, and a circular intake port 4 is provided on the upper portion of the standing wall 2. A duct 5 is provided inside the standing wall 2, and an exhaust fan 6 attached to the other end of the duct 5 exhausts the exhaust air to the outside.

A metal cylinder having a closed end surface 9, that is, a bottomed cylindrical body 7 is projected from the peripheral edge of the air inlet 4, and a plurality of slits parallel to the axial direction are formed on the peripheral surface of the cylindrical body 7. Through holes 8 are provided. In the figure, arrows indicate the wind speed of exhaust gas in each part and its direction. In addition, in FIG. 4, the gas inlets 4a and 4b are provided so as to face the respective gas stoves 3a and 3b of the two-port gas cooker 3, and in this case, the inlet on the gas stove side where the fire is extinguished is closed. I will leave it.

In the present invention, the intake port 4 is not provided over the entire width unlike the conventional example of FIG. 6, but is provided at one central position (two positions in the embodiment of FIG. 4) as shown in FIG. The reason for this is to avoid unnecessary intake of side air (indicated by A in FIG. 3) that does not include exhaust gas, and to increase the exhaust gas collection rate. Further, the intake port 4 has a circular shape and a through hole is formed in the periphery thereof. Cylindrical body 7 having 8
The reason for projecting is that a vortex flow is generated around it to make the lateral flow velocity for sucking the exhaust gas sufficiently higher than the rising speed of the exhaust gas.

FIG. 5 illustrates the principle of the present invention. In order to suck hot exhaust gas in the lateral direction, the lateral speed of the exhaust gas is at least equal to the rising speed v ₁ (about 1 m / sec) of the exhaust gas. Requires wind speed v ₂ . On the other hand, since the flow velocity of the sucked air usually decreases in inverse proportion to the square of the distance from the intake port 4, it is necessary to maximize the flow velocity at the intake port and bring the intake port 4 as close to the gas stove 3 as possible. However, there is a drawback that the noise abruptly increases when the flow velocity of the intake port exceeds about 4 m / sec, and the distance between the intake port and the gas stove is limited by other factors.

Therefore, when a cylindrical body 7 having a through hole 8 on its peripheral surface is projected from the intake port 4 as in the present invention, a vortex flow is generated around the cylindrical body 7 due to the air flow in the radial direction. The velocity of the outer periphery of the vortex reaches twice to several times that in the case where there is no vortex. Therefore, even if the amount of suction air is relatively small, about 300 to 500 m ³ / h, it is possible to reliably suck the exhaust gas, confine it in the vortex, and discharge it to the outside. In this embodiment, the intake port 4 is provided on the vertical surface of the rear standing wall 2. However, when the standing wall 2 is not so high, the intake port 4 is provided on the upper surface of the standing wall 2 as shown in the conventional example of FIG. It may be provided on an inclined surface.

[0011]

As described above, according to the present invention, the intake port is formed in a cylindrical shape to generate a vortex flow, and the exhaust gas is diffused to the outside by utilizing the fact that the peripheral velocity of this vortex flow is higher than the radial velocity. since so as to suck without improves the exhaust collection rate, conventional 1000 m ³ / h about the lower exhaust system air volume has been needed has become possible with the required air volume of 300~500m ³ / h. As a result, it has been possible to mitigate the problems of wind fan noise of the exhaust fan, whistling of windows and mailboxes, and difficulty in opening and closing windows and doors, which have been problems in the conventional exhaust system. . Although the present embodiment has been described with respect to the gas cooker, the same effect can be obtained in the electric cooker.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of the present invention.

FIG. 2 is a perspective view of an essential part of the same.

FIG. 3 is a top view of the above.

FIG. 4 is a top view of another embodiment of the present invention.

FIG. 5 is an explanatory view of the principle of the present invention.

FIG. 6 is a perspective view of a conventional example.

[Explanation of symbols]

 1 Gas Cooker 2 Rear Standing Wall 3 Gas Stove 4 Intake Port 5 Duct 6 Exhaust Fan 7 Cylindrical Body 8 Through Hole 9 End Face

Claims (1)

[Claims] 1. A ventilator for a heating cooker in which a circular intake port is provided on a rear standing wall of the heating cooker, and a duct connected to the intake port is opened to the outside through an exhaust fan. A ventilator for a heating cooker, which is formed by projecting a bottomed cylindrical body having a plurality of through holes on the peripheral surface from the periphery of the mouth.