JPH04208341A - Simultaneous supply-exhaust type kitchen ventilator - Google Patents

Abstract

PURPOSE:To reduce the flow rate of an exhaust fan and diminish noise generation by a method wherein an air supply path is laid along the shape of a hood which collects contaminated air in a kitchen, and fresh outside air is supplied by an air supply fan through the air supply path. CONSTITUTION:A motor is driven to rotate an air supply fan 3 and an exhaust fan 6 via a shaft 8. Fresh outside air is sucked from outside through an air supply duct 10 by the air supply fan 3, cleaned by a filter 5 and blown downward through an air supply path 4 that is laid along the shape of a hood 1. The fresh air is blown out so as to surround a cooking table 12 and stoves 13 and an air curtain is formed between the hood 1 and the cooking table 12. This air curtain effect restrains smoke, heat, odor, etc., generated from the stoves during cooking from dispersing, for example, and in addition it eliminates an influence of a light wind. Therefore, the surface velocity just in front of a grease filter 9 is reduced with its collection performance maintained, so that the flow rate of the exhaust fan 6 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a simultaneous supply/exhaust type kitchen ventilation system used for exhausting a kitchen.

Conventional technology In recent years, as houses have become more airtight and higher-rise, ventilation with large air volumes can cause problems such as fan noise, difficulty in opening and closing doors and windows, backflow of bad odors from toilet vents, drafts, etc.
Problems such as disturbance of the air environment in living rooms due to airflow from the air supply vents are occurring. It is known that in order to prevent these problems from occurring, users intentionally slow down the fan speed and reduce the air volume. Therefore, in order to solve these issues, we have developed a kitchen ventilation system that achieves lower air volume while maintaining collection performance by changing the mounting position of the exhaust fan inside the hood, and a system that detects the differential pressure between indoor and outdoor. Systems have been developed that supply air while controlling the amount of air supply commensurate with the displacement, or that preheat the airflow to be supplied and perform simultaneous supply and exhaust. [For example, Proceedings of the Society of Air Conditioning and Sanitary Engineers, pp. 805-812, 1989 (Nagoya)] Problems to be Solved by the Invention However, with the conventional technology as described above, when the exhaust air volume is reduced, It is easily affected by the wind around the hood in the kitchen, making it impossible to maintain its collection performance.

Furthermore, in the case of mid-to-high-rise residences that are susceptible to the effects of strong outside winds, sufficient exhaust ventilation cannot be achieved due to outside wind pressure. Furthermore, since air supply commensurate with the amount of exhaust must be supplied from somewhere in the dwelling unit, measures must be taken to prevent drafts and the air supply location must be determined for each dwelling unit so that it does not disturb the air environment in the room or cause discomfort to the occupants. It was very difficult to convert them into a film.

The present invention solves the above-mentioned problems by exhausting air inside the hood and simultaneously supplying air from an air supply path provided outside the hood along the hood shape. Even if the kitchen ventilation system is affected by strong outside winds, the exhaust air volume can be reduced while maintaining the collection performance, and by simultaneously supplying and exhausting the kitchen ventilation system alone, the exhaust air volume can be maintained even if the kitchen ventilation system is affected by strong outside winds. The purpose is to provide an exhaust type kitchen ventilation system.

Means for Solving the Problems In order to achieve the above objects, the present invention includes a hood k that collects contaminated air generated in a kitchen, an exhaust fan that exhausts the contaminated air, and a supply of fresh air from outside into the room. In order to introduce the fresh air into the room, the hood is provided with an air supply fan and an air supply ventilation path that passes through the air supply fan and follows the shape of the hood.

Effect of the Invention With the above-described configuration, the present invention uses an air supply fan to feed outdoor fresh air into the air supply air passage provided along the shape of the hood that collects contaminated air in the kitchen, and from the opening at the bottom of the air air supply air passage. By supplying air into the room and creating an air curtain around the bottom of the hood, the diffusion of contaminated air generated at the bottom of the hood is suppressed, and the influence of small winds in the surroundings can be prevented, slowing down the surface wind speed inside the hood. Therefore, the air volume of the exhaust fan can be reduced.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.

As shown in the figure, three sides of the hood 1 that are not in contact with the inner wall 2 are provided with air supply ventilation paths 4 that communicate with an air supply fan 3 so as to follow the shape of the hood 1.

A filter 5 is attached to the suction port of the air supply fan 3. The air supply fan 3 and the exhaust fan 6 are connected by the same shaft 8 from the motor 7, and a grease filter 9 is attached below the exhaust fan. Also,
The air supply fan 3 and the exhaust fan 6 are connected to an air supply duct 1o and an exhaust duct 11 that communicate with the outside.

To explain the operation of the above configuration, by driving the motor 7, the air supply fan 3 and the exhaust fan 6 are rotated via the shaft 8. Fresh air is purified by the air supply fan 3 from outside through the air supply duct 1o and filter 5.
The air is blown downward through a supply air passage 4 that follows the shape of the hood 1.

This fresh air is blown out to surround the cooking table 12 and stove 13, so that an air curtain is formed between the hood 1 and the cooking table 12. This air curtain effect suppresses the diffusion of smoke, heat, odor, etc. generated by the stove 13 during cooking, and also prevents the influence of small winds in the surroundings. Therefore, it is possible to reduce the surface wind speed immediately in front of the grease filter 9 while maintaining the collection performance, and therefore the air volume of the exhaust fan 6 can be reduced.

In a kitchen ventilation system like the present embodiment, the surface wind speed immediately before the grease filter 9 is normally designed to be about 0.6 to 1.0 m/s. For example, when the air is blown downward from the supply air passage 4 in this embodiment at a rate of 1 to 2 m y's, the same result can be obtained even if the surface wind speed in front of the grease filter 9 is lowered to 0.2 to 0.3 m/s. Collection performance can be maintained.

Furthermore, in the case of residential units such as mid-to-high-rise residences that are strongly affected by outdoor winds, the exhaust air volume decreases as the load increases due to the external pressure. However, since the load on the air supply fan 3 decreases due to the outside pressure, the air supply air volume tends to increase.
When they are connected by the same shaft 8, they balance and cancel each other out, so that it is possible to suppress a reduction in the exhaust air volume due to the influence of outside wind.

As described above, according to the simultaneous air supply/exhaust type kitchen ventilation system according to the embodiment of the present invention, the air curtain effect of blowing outdoor fresh air downward from the air supply ventilation path 4 can prevent the influence of the wind around the hood, so that the airflow during cooking can be prevented. Diffusion of smoke, heat, odor, etc. generated by the stove 13 can be suppressed.

In addition, since the exhaust air volume can be reduced while maintaining the collection performance, the energy saving effect by reducing the exhaust air volume,
Generated noise can be reduced.

In addition, as mentioned above, since the exhaust and air supply associated with kitchen ventilation can be completed by itself, the door can be used even in mid-to-high-rise residences that are strongly affected by outside winds.

This makes it easier to open and close windows, and prevents problems such as backflow of bad odors from the toilet ventilation opening, and disturbance of the air environment in the living room due to drafts to compensate for insufficient air supply and airflow from the air supply opening. can.

Effects of the Invention As is clear from the above embodiments, according to the present invention, the air volume of the exhaust fan can be reduced while maintaining the collection performance, and the reduction in the exhaust air volume has an energy saving effect and a reduction in generated noise. There is an effect that can be achieved.

In addition, simultaneous supply and exhaust ventilation for kitchen ventilation can be completed by itself, making it easy to open and close doors and windows, and also prevent bad odors from flowing back from the toilet vents and drafts and air intakes to compensate for insufficient air supply. This has the effect of preventing problems such as disturbance of the air environment in the living room due to air currents.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a simultaneous air supply and exhaust type kitchen ventilation system according to an embodiment of the present invention, and FIG. 2 is a front view of the same embodiment. 1...Hood, 3...Air supply fan, 4
...Air supply ventilation duct, 6...Exhaust fan.

Claims (1)

[Claims] a hood for collecting contaminated air in the kitchen; an exhaust fan for exhausting the contaminated air; an air supply fan for supplying fresh air from outside into the room; and an air supply fan for introducing the fresh air into the room. A simultaneous supply/exhaust type kitchen ventilation system having an air supply/ventilation path that communicates with the hood and follows the shape of the hood.