JPS60186637A - Range hood device - Google Patents

Abstract

PURPOSE:To improve the collecting rate without employing a larger sized fan by a structure wherein a Coanda effect plate is arranged at the position, to which the updraft developed at a gas range contacts, at the rear of the gas range. CONSTITUTION:A Coanda effect plate 4 is attached near the ascent of exhaust gas 8 developed at a gas stove 3 between the gas stove 3 and a range hood 6. Due to the attachment of the Coanda effect plate 4 in the above-mentioned manner, the exhaust gas forms a concentrated ascending air current along the Coanda effect plate without diffusing to the indoor side, resulting for almost all the gas in being caught by the range hood 6 and sucked by a fan 9. When the exhaust gas flow rate is set 30 times the conventional exhaust gas flow rate or 240m<3>/h, the collecting rate is 80%. However the fan flow rate of 140m<3>/h is enough for obtaining the collecting rate of 80% by using the Coanda effect plate 4. Further, when the fan exhaust gas flow rate is set 30 times under the condition that the Coanda effect plate 4 is used, the collecting rate exceeds 90%.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a range hood device installed in a kitchen or the like, and uses the Coanda effect to improve the range hood's performance, that is, the exhaust gas collection rate, by 15% compared to conventional ones.
The feature is that it has been improved by ~20%.

Figure 1 shows an example of a conventional range hood, but the range hood 6 has a head that does not get in the way of the cook.
-The person you can ask about is a business person. In addition, the loss air wind h1 in the conventional range hood 6 is 3 for υI gas 1n.
It is customary to set it to 0x.

However, as shown in No. 8 of the first issue, the waste left behind from the gas stove 3 has the property of spreading to the surrounding area and becoming -1-1, and the range hood 6 sucks in not only the waste but also the indoor air. Therefore, the collection rate is less than 80%.

Therefore, in order to further increase the collection rate of this exhaust gas, it is conceivable to move the range hood 6 closer to the gas stove 3 or to increase the exhaust air from the range hood 6 by 30 or 40 times.

However, there is a limit to how close the range hood 6 can be to the gas stove 3, and if you use a method that increases the exhaust air volume by increasing the size of the fan, it will be noisy, and its effectiveness will be halved when cooling or heating. The cost increases, the exhaust duct becomes larger and the hole through the wall becomes larger,
There are disadvantages such as a decrease in wall strength, and the increased size of the exhaust tact spoils the aesthetics of the building.

From this point of view, it is an object of the present invention to propose a new technical means for increasing the collection rate in a range hood device without increasing the size of the fan.

In order to achieve the above object, the present invention is characterized in that a Coanda effect plate is arranged at the rear of the gas range and in contact with the rising airflow generated from the gas range. When the Coanda effect plate is placed behind the gas range in this way, a low-pressure vortex is created between the rising airflow and the Coanda effect plate, and due to the differential pressure between this low-pressure vortex and the outside air, the rising air flow is caused by the Coanda effect. It is bent toward the plate side, placed on the Coanda action plate, and placed υl outside through the exhaust suction port.

In other words, the present invention utilizes the Coanda effect as a means to increase the collection rate.

Figure 2 shows a smaller example of the range hood device using the core ivy effect described above, where ■ is a range, 3 is a gas stove,
4 is a Coanda effect plate for producing the Coanda effect, and this Coanda effect plate 4 is located between the gas stove 3 and the range hood 6 in the vicinity where the gas 8 generated from the gas stove 3 rises. There is. 9 indicates a fan.

When the Coanda effect plate 4 is attached to the range hood device as described above, the exhaust gas is collected as an upward air current along the Coanda effect plate, is not diffused indoors, and most of it is captured by the range hood 6 and sent to the fan. 9 will be sucked in.

Figure 3 shows a comparison example of the collection rate between the range hood device according to the present invention that has a Coanda effect plate and a conventional range hood device that does not have a Coanda effect plate. The capacity of the gas (table) stove is 7.30
It is 0 kcal/h.

As is clear from Fig. 3, when the conventional range hood's 1-no-1 air-spear is set at 240 m'/h, which is 30 times faster, the collection rate is 80%, but the Coanda action plate 4 In order to obtain a collection rate of 80% using Moreover, if the fan's υ1 air volume is set to 30 times, the collection rate will be 90% or more.

According to experiments, there is no significant difference in the effect whether the Coanda effect plate 4 has a shape of 17, a plate, a curved shape, or an inclined shape.

FIG. 4 shows an example in which the exhaust gas from the roaster 2 installed in the range 6 is led to the range 16 through an exhaust gas passage 5' formed by the Coanda action plate 4 and the back plate 5. In this way, smoke and oil from the pottery will be completely collected without leaking into the room.

Figure 5 shows the pottery 2 placed behind the Coanda 1'1 river board 4.
This is an example in which the oven 10 is installed in the υ1 gas passage 5' and the υ1 waste from the oven 10 is brought to the range hood 6 through the gas passage 5'.

FIG. 6 shows an example in which the undercoat 7 covering one side of the gas stove 3 is also made to function as a part of the Coanda action plate 4.

According to the present invention, the following effects can be expected by arranging the Coanda effect plate at the rear of the range in a range hood device.

a. If %1ljlj of the fan is the same, the collection rate will improve to 90% or more.

b. If the collection rate is set to about 80% of the conventional rate, the air volume of the fan can be reduced to about 2/3 of the conventional rate, and therefore the fan can be made smaller.

By making the C6 fan smaller, noise is reduced, power costs are reduced, and fan production costs are reduced.
This has the effect of ensuring wall strength by reducing the size of the exhaust duct and reducing the diameter of the through-hole in the wall, and does not impair the aesthetics of the building.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of a conventional range hood. FIG. 2 is a side view showing the range hood device according to the present invention. FIG. 3 is a graph showing a comparison example of the collection rate between the present invention and a conventional range hood. Fig. 4.5.6 is a side view of a range foot device showing another embodiment of the unfired IJj. ■...Microwave, 2...Yakiware, 3.
...Gas stove, 4...Coanda action plate, 5.Old...back plate, 6..Range hood, 7.
Old...arrival, 8.old...waste, 9...fan,
lO...Oven. C, t#h 4; Blue line←λ 4th page Figure 5

Claims (1)

[Claims] 1. A range hood device in which a Coanda action plate is arranged at the rear of the gas range and in contact with the ly airflow generated from the gas range.