JPH074712A - Device for range hood - Google Patents

Abstract

PURPOSE:To make a range hood structurally smaller without decreasing the trapping efficiency by forming between a guide plate and a hood body a space serving as an inflow passage connecting a suction hole to a fan in a setup to removably attach a filter in the shape of a picture frame to the suction hole. CONSTITUTION:Suction holes 5 are formed at the border of a guide plate 4 of metal attached to the underside of a range hood body 1 in a removable manner by means of fixing fittings 6 which serve also as spacers. The waste gases from the combustion and cooking rise as shown by arrows (a) and impinge against the guide plate 4; after sharply losing momentum, the flow of the gases turns horizontally in direction and spreads in all directions along the guide plate 4; through filters 8 set in suction holes 5 at the border the gases are sucked into an inflow passage 7 where their flow turns toward the center; then the gases are discharged by a fan 2 to the outdoor. While achieving as good a trapping efficiency as conventional hoods, this constitution enables decreasing the height of the range hood bode to about one third. As a result, the condition for attaching a range hood is less restricted than before and this narrow kitchen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a range hood device for discharging combustion waste air (including cooking waste air) to the outside.

[0002]

2. Description of the Related Art The greatest problem of a range hood that discharges combustion waste air to the outside is to improve the collection rate. The easiest way to improve the collection rate is to set a large exhaust air volume of the fan, but increasing the exhaust air volume of the fan increases the size of the range hood, increases noise, and increases the air conditioning load. There are drawbacks such as increase in size and consumption of electric power, and the size cannot be increased unnecessarily.

Therefore, a flow path forming member is incorporated in the suction port of the range hood to form a suction passage, and in the conventional range hood, the flow velocity of the suction airflow around the suction port where waste air easily overflows is increased to increase the trapping speed. A proposal (Japanese Utility Model Laid-Open No. 3-42944) for improving the efficiency is known.

[0004]

In this known example, the following three points are important for maximizing the performance of the known example.

A. In order to increase the waste suction wind speed, a trapezoidal flow passage forming member is incorporated in the suction port to form a small suction passage.

B. A downwardly expanding tubular body is provided in the range hood so that the flow path formed between the flow path forming member and the flow path forming member has no flow resistance.

C. The distance between the lower expanding tubular body and the lower end of the range hood is set to about 11 cm. As a result, the height of the range hood is increased, the degree of freedom in mounting is limited, and the cost is increased. Furthermore, it is impossible to improve the collection rate by attaching such a flow passage forming member to an existing range hood, and also, below the flow passage forming member, a filter is attached to almost the entire lower surface of the range hood. Therefore, the disposable filter is difficult to use due to cost and waste problems.

The object of the present invention is that it has a high degree of freedom in mounting, is easy to clean, can use a disposable filter, and is inexpensive and can be implemented even when improving the collection rate of an existing range hood. A range hood device is provided.

[0009]

The range hood device according to the present invention has the following structure.

A flat guide plate is detachably attached to the lower surface of the hood main body so as to be detachably attached to form a suction port around the guide plate, and a space between the guide plate and the lower surface of the hood main body is provided. A range hood device which is formed as an inflow path for connecting the suction port and the fan, and in which a frame-shaped filter is detachably attached to the suction port.

In the above construction, a normal filter may be attached to the suction port in order to collect the oil dust, but since the area of the suction port is small, it is convenient to attach a disposable filter. is there. Further, the guide plate and the filter may be integrally combined.

Next, the dimension of the inflow passage in the height direction is
It may be minimized as long as noise and pressure loss do not increase,
As a result, the range hood can be downsized.

[0013]

[Operation] The combustion waste air and cooking waste air generated from the gas stove, etc. rise due to the negative pressure formed by the draft and range hood generated due to the waste itself being hotter than the ambient air, and once collide with the guide plate. Then, after suddenly losing momentum, it turns to the horizontal direction and flows in four directions along the guide plate, and is sucked into the inflow passage from the suction port where the surrounding filter is attached, and it is directed toward the center here. Change into the fan and be discharged to the outside.

[0014]

1 and 2, reference numeral 1 is a range hood body, 2 is a fan incorporated in the range hood body 1, 3 is a motor, and 4 is a fixing metal fitting on the lower surface of the range hood body 1 which also serves as a spacer. The guide plate made of metal is detachably attached by means of 6, and the periphery of the guide plate 4 is shown in FIG.
The suction port 5 is formed as shown in FIG. The width of the suction port 5, that is, the width of the gap formed by the opening at the lower end of the range hood body 1 and the guide plate 4 should be as small as possible within the range in which the pressure loss does not increase. Although the guide plate 4 of the embodiment is flush with the lower surface of the range hood body 1, it may be slightly below or above the range hood body 1.

Reference numeral 7 denotes a horizontal inflow passage formed by the periphery of the guide plate 4 and the lower surface 1a on the range hood body 1 side and continuing to the suction port 5, and 8 is detachably attached to the suction port 5. It is a frame-shaped disposable filter.

As a means for attaching the filter 8, as shown in FIG. 3, small holes 6c through which the small-diameter portion 6a of the fixing member 6 passes are provided at the four inner corners of the filter 8, as shown in FIG. First, the small hole 6c of the filter 8 is passed through the small diameter portion 6a of the fixing member 6, the small hole 4'of the guide plate 4 is passed through the small hole 6c, and finally the decorative nut 6b is tightened, or as shown in FIG. The guide plate 4 and the filter 8
To form a guide plate 9 with a filter, the filter 8 is not provided with a small hole 6c, and a hook 10 is provided on the range hood body 1 side as shown in FIG. 6, and as shown in FIGS. Alternatively, both ends of the filter guide plate 9 may be hooked and fixed to the hook 10 from the inside. In this case, the one end of the filter guide plate 9 can be easily removed by slightly lifting it inside the range hood body 1.

In the above embodiment, the combustion and cooking waste gas rises as shown by an arrow a in FIG. 1 and collides with the guide plate 4, and suddenly loses its momentum, and then it turns to the horizontal direction to guide the guide plate 4. Flows in all directions along with, is sucked through the filter 8 of the surrounding suction port 5 and enters the inflow passage 7, where it turns to the center direction and flows, and is discharged to the outside by the fan 2.

[0018]

The present invention has the above-mentioned structure and operation, and has the following effects.

A. The collection rate was improved by attaching one guide plate to the suction port and forming an inflow path between the guide plate and the lower surface of the hood body. Figure 8 shows one stove fully opened (3100 kcal / h) with the pan on it.
Shows the collection rate when. The range hood according to the present invention achieves a collection rate almost equal to that of the above-mentioned known example in which the flow path forming member is attached, and the height of the range hood body can be reduced to about 1/3 as compared with the known example. As a result, the degree of freedom in attaching the range hood is increased, which is particularly effective for a small kitchen and makes the design smart.

B. The guide plate is made of a single thin plate and can be easily removed from the hood body by simply removing the fixing bracket, making it easy to clean.

C. Since the guide plate is only one plate, the cost is low.

D. The present invention can be applied not only to the new range hood but also to the improvement of the collection rate of the existing range hood, because it can be attached only by processing the size of the guide plate according to the size of the suction port.

E. Since the area of the suction port is small, even if a disposable filter is attached here, the usage amount is small, it is resource saving, and the cost of the filter is low.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a range hood device according to the present invention.

FIG. 2 is a view showing a suction port portion and a guide plate of the range hood device as viewed from below.

FIG. 3 is an explanatory diagram of small holes provided in a filter.

FIG. 4 is an explanatory view of a fixing means of a filter.

FIG. 5 is an explanatory diagram of an example in which a guide plate and a filter are integrated.

FIG. 6 is a perspective view showing a state where a guide plate and a filter which are integrated with each other are attached to a range hood using a hook.

FIG. 7 is a cross-sectional view showing a state where a guide plate and a filter that are integrated are attached to a range hood using a hook.

FIG. 8 is an explanatory view showing a comparison of collection rates of the range hood device according to the present invention and a known example.

[Explanation of symbols]

 1 Range Hood Main Body 2 Fan 3 Motor 4 Guide Plate 5 Suction Port 6 Fixing Metal 7 Inflow Path 8 Filter 9 Guide Plate with Filter 10 Hook

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuji Otsuka 4-1-2 Hiranomachi, Chuo-ku, Osaka City, Osaka Prefecture Osaka Gas Co., Ltd.

Claims (2)

[Claims] 1. A flat guide plate is removably attached to the lower surface of the hood main body so as to be detachable, and a suction port is formed around the guide plate, and between the guide plate and the lower surface of the hood main body. A range hood device in which a space is formed as an inflow path for connecting the suction port and a fan, and a frame-shaped filter is detachably attached to the suction port. 2. The range hood device according to claim 1, wherein the guide plate and the filter are integrally combined.