JPH1183106A - Kitchen exhaust device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a kitchen exhaust device by which the diffusion and dilution of offensive smell by air are performed effectively and besides is capable of operation at low cost in conformity with the occurrence of offensive smell, and elongates the contact time between a deodorizer and the exhaust long enough in the case that the deodorizer is used, and besides is capable of automatic operation geared to the concentration of offensive smell. SOLUTION: In a kitchen exhaust device which discharges the air from a kitchen 11 into air through an exhaust duct 12 by an exhaust fan 18, an outside air introduction duct 13 for diffusing and diluting the offensive smell contained in exhaust air is connected to the middle of the exhaust duct 12. Moreover, the exhaust duct is provided with an offensive smell sensor which detects the concentration of the offensive smell in exhaust and a deodorizer sprinkling means which sprinkles gaseous or liquidous deodorizer in the case that the concentration of offensive smell is at a specified value or over.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a kitchen exhaust system that discharges exhaust gas from a kitchen into the atmosphere, and more particularly, to an external air introduction duct for diffusing and diluting odors contained in exhaust gas. It relates to a connected kitchen exhaust system. Furthermore, the present invention relates to a kitchen exhaust system in which a gas or liquid deodorant is sprayed on an exhaust duct in a kitchen exhaust system.

[0002]

2. Description of the Related Art Exhaust gas accompanying cooking from a kitchen such as a food factory or a restaurant is discharged into the atmosphere through an exhaust duct by an exhaust fan. If the emitted exhaust is odorous, it will affect nearby areas.

[0003] Of the odor components contained in the exhaust gas accompanying cooking, those which give off odors or strong odors mainly include mercaptans (such as onion odor) and sulfides (such as garlic odor). Since the threshold is on the order of tens of ppb and has a very low odor discrimination concentration, the human olfactory response is quite sensitive. In order to remove the bad odor due to such irritating odor wastes, it is effective to diffuse the odor into the atmosphere and dilute the odor with the atmosphere. The greater the degree of dilution, the greater the effect.

[0004] Exhaust gas containing effluent such as odor is discharged to the atmosphere through an exhaust duct (or chimney) projecting outside the building. In order to enhance the deodorizing effect of the exhaust gas discharged from the exhaust duct, it is necessary to increase the discharge port of the exhaust duct as high as possible or to increase the discharge speed as high as possible to discharge the exhaust gas to a high position.

[0005]

However, in general, the height of the exhaust gas discharged from the chimney, which is not affected by the airflow above the building, is about 2.5 times the height of the building. In order to prevent this, it is considered desirable to release the gas above this height. If this is applied to ordinary food factories, etc., the height of the chimney may need to be close to 20 m in consideration of the flow properties around the building based on the building installation conditions. It is impractical when considering the high cost and aesthetics for reinforcement and the like.

If the exhaust duct is simply made as high as possible or the exhaust flow rate is increased, the exhaust gas is discharged at a high concentration, and if the exhaust gas cannot be sufficiently attracted to the surrounding atmosphere, The effect of diffusion and dilution by the atmosphere becomes insufficient. In addition, the odor is not always generated, but is generated intermittently by the cooking process, etc., but if the exhaust is continuously performed with the wind speed and air volume increased under the operating conditions at the time of the odor generation, the power cost will be reduced. The rise leads to higher costs.

On the other hand, there is used a kitchen exhaust device that discharges exhaust gas accompanying cooking from a kitchen such as a food factory or a restaurant to the atmosphere through an exhaust duct by an exhaust fan through a deodorant. In this case, the exhaust gas is discharged from the exhaust duct through a deodorizing agent such as activated carbon provided in the exhaust duct. If the deodorization is insufficient, the discharged exhaust gas affects the neighborhood with an odor. In order to enhance the deodorizing effect of the deodorant, it is effective to contact the exhaust with the deodorant for a sufficiently long time.

However, in a conventional kitchen deodorizing apparatus, a deodorizing agent is provided in an exhaust duct, and the exhaust gas passes through the deodorizing agent and contacts the deodorizing agent.
The contact time was short and the deodorizing effect was not sufficiently obtained. To cope with this point, there has been proposed a deodorizing exhaust method in which a deodorizing agent is vaporized and sprayed in an exhaust duct to extend a contact time (Japanese Patent No. 2555762). However, according to the technique described in this publication, an appropriate amount of deodorant cannot always be automatically sprayed according to the intensity of the odor, and adjustment of the deodorizing action is troublesome.

The present invention has been made in view of the above points, and effectively diffuses and dilutes the odor by the atmosphere without using a special high duct, and has a low power cost corresponding to the generation of the odor. An object of the present invention is to provide an operable kitchen exhaust system.

Further, the present invention provides a kitchen which is capable of automatically operating so that the contact time between the exhaust gas and the deodorant is sufficiently long without slowing down the exhaust gas passing speed, and that the optimum odor action according to the odor concentration is obtained. The purpose is to provide an exhaust device.

[0011]

In order to achieve the above object, according to the present invention, there is provided a kitchen exhaust system for discharging exhaust air from a kitchen to the atmosphere via an exhaust duct by an exhaust fan, wherein the exhaust gas is included in the exhaust gas. A kitchen exhaust device is provided, wherein an outside air introduction duct is connected in the middle of the exhaust duct to diffuse and dilute the odor.

According to the above configuration, the exhaust gas flowing through the exhaust duct is agitated and diluted by the outside air from the outside air introduction duct connected to the exhaust duct, and the air volume and the wind speed increase so that the exhaust gas flows from the exhaust duct into the atmosphere at high speed. Released. Thus, the odor component in the exhaust gas can be sufficiently diffused and diluted.

According to the present invention, in order to achieve the above object, in a kitchen exhaust system for discharging exhaust air from a kitchen to the atmosphere via an exhaust duct by an exhaust fan, the exhaust duct detects an odor concentration in the exhaust gas. Odor sensor
A kitchen exhaust device, comprising: a deodorant spraying means for spraying a gas or liquid deodorant when the odor concentration is equal to or higher than a predetermined value.

According to the above configuration, when the odor sensor detects a strong odor having an odor concentration equal to or higher than a predetermined value from the exhaust gas flowing through the exhaust duct, the deodorant spraying means sprays a gas or liquid deodorant. As a result, automatic operation according to the odor concentration becomes possible, and a deodorizing effect using the deodorant efficiently can be obtained. In addition, the exhaust gas has a sufficient contact time with the deodorant in the exhaust duct to remove odor components from the exhaust gas. Further, when the odor is weak, it is possible to reduce the amount of the deodorant and to eliminate waste of the deodorant.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a preferred embodiment,
A booster fan is provided in the middle of the outside air introduction duct for diluting and diffusing the odor. With this configuration, the booster fan operates and the outside air is reliably introduced at a certain flow rate by the blowing pressure. As a result, the exhaust gas and the outside air are efficiently mixed, the exhaust gas is stirred and diluted by the outside air, and the exhaust gas flow rate and the exhaust gas flow rate are increased to be discharged to a high position in the atmosphere.

[0016] In a further preferred embodiment, the exhaust fan is a fan whose air volume can be changed by an inverter or the like, wherein an external air adjusting damper is provided in the external air introducing duct, and the exhaust fan is adjusted according to the air volume of the exhaust fan. Thus, the opening degree of the damper is changed.

With this configuration, the opening degree of the outside air adjustment damper changes in accordance with the change in the exhaust air volume of the exhaust fan, and the diluted external air is reduced to increase the rotation speed of the exhaust fan while the exhaust volume in the kitchen room is kept constant. Can be introduced accordingly. In particular, when the odor is required to be diluted and diffused, the exhaust gas diluted and diffused with sufficient outside air through the exhaust duct can be quickly supplied without causing a pressure balance disorder due to the air volume adjustment of one exhaust fan on the exhaust duct. It is possible to release into the atmosphere at a flow rate. In another preferred embodiment, a diffusion means for disturbing the flow of the exhaust gas and promoting mixing and dilution with the atmosphere is provided at an outlet of the exhaust duct.

With this configuration, the diffusion means disturbs the flow of the exhaust gas discharged from the discharge port of the exhaust duct, and promotes mixing and dilution with the atmosphere. Thus, the odor concentration of the exhaust gas discharged from the outlet can be further reduced.
In still another preferred embodiment, the diffusing means is a swirling blow device having a plurality of slits radially arranged so as to be twisted so that the exhaust gas is swirled.

In this configuration, the flow of the exhaust gas discharged from the discharge port via the swirl-blowing device becomes a vortex by passing through the slit. Thereby, the diffusion and dilution effects of the exhaust gas can be enhanced with a simple configuration. In still another preferred embodiment, the diffusing means is a propeller that rotates by exhaust pressure.

With this configuration, the flow of the exhaust gas discharged from the discharge port via the propeller is agitated by the rotating propeller due to the exhaust pressure and becomes a vortex. As a result, the exhaust pressure is effectively used for forming the vortex of the exhaust gas, and the pressure loss can be suppressed low to enhance the effect of diffusion dilution into the atmosphere. In another preferred embodiment, the deodorant spraying means adjusts the time and / or amount of spraying the deodorant according to the odor concentration.

According to this configuration, the optimum amount and time of spraying of the deodorant to be sprayed are adjusted together or independently based on the odor concentration detected by the odor sensor. As a result, the spray amount of the deodorant increases when the odor is strong, and decreases when the odor is weak, and the exhaust time is reduced by the minimum amount of the deodorant required to deodorize the odor component. Sufficiently secured and efficiently deodorized. In still another preferred embodiment, a turbulence generating means is provided in the exhaust duct on the discharge side of the exhaust fan to promote mixing of the deodorant and the exhaust.

With this configuration, turbulence is generated in the exhaust flow in the exhaust duct between the exhaust fan and the outlet of the exhaust duct, and the mixing action between the deodorant sprayed in the duct and the exhaust from the kitchen is generated. Promoted. Since the turbulence generating means is provided on the discharge side of the exhaust fan, the installation layout of the deodorizing device provided on the suction side duct is not restricted, and the degree of design freedom in the machine room or ceiling is increased, and the optimal arrangement is provided. Configuration can be obtained.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of a kitchen exhaust device according to a first embodiment of the present invention. As shown in FIG.
Has an exhaust duct 12 that discharges exhaust gas from the kitchen 11 into the atmosphere, and an outside air introduction duct 13 that is connected in the middle of the exhaust duct 12. The exhaust duct 12 is disposed, for example, in the ceiling 11a of the kitchen 11, and has the intake port 14 located in the kitchen 11 and the exhaust port 15 located outdoors. A suction port 14 of the exhaust duct 12 is located above a cooking table 16, and a hood 17 for collecting exhaust gas containing oil, moisture, odor and the like emitted during cooking is attached around the intake port 14.
A grease filter 14a for collecting oil from exhaust gas is mounted in the hood 17.

In the middle of the exhaust duct 12, an exhaust fan 18 is provided.
Is provided. An outside air introduction duct 13 is connected to the exhaust duct 12 on the discharge side of the exhaust fan 18. This outside air introduction duct 13 is, for example,
They are connected at a merging angle where they can merge smoothly without disturbing the flow of the exhaust flow inside. Alternatively, a mixing chamber may be provided at the junction. In this case, the mixing chamber needs to have a shape and a size that do not impair the pressure balance and do not hinder the smooth flow of the exhaust gas.

In the vicinity of the suction port 14 of the exhaust duct 12, an odor sensor 20 for detecting the odor intensity in the exhaust gas is provided.
Based on the signal from the odor sensor 20, the booster fan 22 provided in the outside air introduction duct 13 is driven via a controller (not shown). This booster fan 22
Of the outside air introduction duct 13a of the outside air introduction duct 13
From outside, outside air is introduced into the exhaust duct 12. The booster fan 22 is activated by the detection signal when a strong odor of a predetermined value or more is detected by the odor sensor 20 described above.

A damper 25 (check damper or other duct opening / closing means) is provided in the middle of the outside air introduction duct 13. The damper 25 prevents the exhaust air from being discharged from the outside air introduction port 13a through the outside air introduction duct 13 when the exhaust fan 18 is driven.

The exhaust gas in the exhaust duct 12 is mixed and diluted with the outside air sent from the outside air introduction duct 13, and then flows through the exhaust duct with an increased exhaust flow rate and exhaust flow rate. Released into the atmosphere. Since the flow rate of the mixed and diluted exhaust gas is high, the exhaust gas is discharged from the outlet 15 to a sufficiently high sky position.

When the odor sensor 20 stops detecting a strong odor of the exhaust gas flowing through the exhaust duct 12, the booster fan 2
2 stops operating, and the kitchen is exhausted only by the exhaust fan 18. Therefore, the kitchen exhaust device 10 according to the present invention is
It does not require a specially expensive exhaust duct 12 which requires a high cost for securing the strength of the exhaust duct 12 itself and reinforcing the wind pressure, etc., and the exhaust duct 12 of a realistic height which does not impair the aesthetic appearance at a low cost makes it possible to use the air. Diffusion and dilution of exhaust gas can be performed effectively.

Further, since the booster fan 22 operates in response to the strong odor that is generated intermittently in the cooking process or the like, the required amount of air can be reduced without increasing the wind speed and air volume with a normal exhaust fan except when the strong odor is generated. Kitchen exhaust can be performed, a fan with a small air volume can be used, and there is no increase in cost due to an increase in power cost.

FIG. 2 is an explanatory view of a kitchen exhaust system according to a second embodiment of the present invention. As shown in FIG. 2, the kitchen exhaust device 30 is different from the kitchen exhaust device 10 according to the first embodiment described above in that the booster fan 22 provided in the outside air introduction duct 13 is not provided.
1 and a large exhaust fan 32 capable of changing the air flow rate.
An outside air introduction duct 34 having an outside air (air volume) adjustment damper 33 is provided in the middle of the exhaust duct 12 on the upstream side of 2.

The outside air introduction duct 34 is connected to an outside air intake 34a through an outside air adjustment damper 33 mounted on the way.
Introduce outside air from The outside air adjustment damper 33 is a motor damper that opens and closes the damper by driving a motor, and can change the opening degree of the damper according to the amount of air discharged from the exhaust fan 32. The opening of the damper is controlled based on a detection signal of a pressure sensor 35 that detects the exhaust pressure in the exhaust duct 12. The pressure sensor 35 is mounted near the suction port 14 of the exhaust duct 12.

With this configuration, the opening degree of the outside air adjusting damper 33 is changed in accordance with the change in the exhaust air volume of the exhaust fan 32, and when the rotation speed of the exhaust fan 32 increases and the sending air volume increases, the increased amount is used. The air volume can be supplemented from the outside air intake 34a.

The outside air adjusting damper 33 and the inverter 31
The odor sensor 20 is connected to the odor sensor 20 provided at the exhaust duct connection part immediately after the hood 17. When the odor sensor 20 detects a strong odor of a predetermined level or more, the inverter 31
, The rotation speed of the exhaust fan 32 is increased to increase the air volume, and the damper 33 is opened based on the detection information from the pressure sensor 35. Thus, while the kitchen exhaust air volume is always kept constant, it is possible to increase the exhaust fan air volume when odor is generated, and to introduce outside air for diluting and diffusing the odor from the kitchen 11.

As described above, the 1 provided on the exhaust duct 12
The outside air introduction duct 3
4, it is not necessary to provide another fan for introducing outside air, so that the structure is simplified and the pressure balance adjustment with another fan becomes unnecessary. Is not hindered, and the exhaust gas flow rate and the exhaust gas flow rate are smoothly increased to enable effective diffusion dilution of the exhaust gas into the atmosphere. The other configuration and operation and effect are the same as those of the first embodiment.

FIG. 3 is an explanatory view of a kitchen exhaust device according to a third embodiment of the present invention, and FIG. 4 is a perspective view of a swirling blow-out device provided in the kitchen exhaust device of FIG. As shown in FIG.
The kitchen exhaust device 36 is different from the kitchen exhaust device 30 shown in FIG. 2 in that a swirl-blowing device 37 is provided at the outlet 15 of the exhaust duct 12 as diffusion means for disturbing the flow of exhaust gas and promoting mixing and dilution with the atmosphere. It is a thing.

As shown in FIG. 4, the swirling blow-out device 37 is
It has a plurality of slits 38 which are formed in a lid shape attached so as to cover the discharge port 15 and are twisted so that the exhaust gas discharged from the discharge port 15 forms a vortex and arranged radially. By passing through the slit 38, the flow of the discharged exhaust gas becomes a swirling flow that expands in a spiral shape, so that the effect of diffusion and dilution to the atmosphere increases, and the odor concentration of the exhaust gas can be further reduced.

As the swirling blow-out device 37, an air flow diffusion blow-out opening or the like generally used for air conditioning or the like for blow-off under the floor may be used, or the swirling blow-out device 37 is discharged from the discharge opening 15 in order to avoid an increase in pressure loss. A propeller (not shown) that rotates by the pressure of the discharged exhaust gas may be used. By using the propeller, the exhaust gas is agitated by the propeller and discharged as a vortex. Other configurations, functions and effects are the same as those of the second embodiment.

Even if only this diffusion means is provided at the outlet of the exhaust duct of a normal exhaust system, the exhaust gas becomes a swirling flow which expands spirally by this diffusion means, and the effect of diffusion and dilution to the atmosphere can be obtained. Can be

FIG. 5 is an explanatory view of a kitchen exhaust system according to still another embodiment of the present invention. As shown in FIG. 5, the kitchen exhaust device 110 has an exhaust duct 112 that discharges exhaust air from the kitchen 111 to the atmosphere. The exhaust duct 112 is disposed, for example, in the ceiling 111a of the kitchen 111, and has the intake port 113 located in the kitchen 111 and the exhaust port 114 located outdoors. Exhaust duct 112
Is located above the worktop 115 of the kitchen 111, and a hood 116 for collecting exhaust gas containing oil, moisture, odor, and the like emitted during cooking is attached around the intake port 113. A grease filter 113a for removing oil in the exhaust is provided at a duct inlet 113 in the hood 116.
Is provided.

In the middle of the exhaust duct 112, the exhaust fan 1
17 are provided. Hood 11 of exhaust duct 112
An odor sensor 118 for detecting the odor concentration in the exhaust gas is provided near the connection with the odor sensor 6, and a deodorant spraying device 119 is provided between the odor sensor 118 and the exhaust fan 117.

The deodorant spraying device 119 includes a storage section 120 for storing a deodorant and a nozzle 12 inside the exhaust duct 112.
1a is exposed, and a scatter sensor 121 is provided.
When the odor concentration detected by the step 18 is equal to or higher than a predetermined value,
The deodorant in the storage unit 120 is sprayed from the nozzle 121a into the exhaust duct 112.

This deodorant is composed of a liquid such as a chemical solution or a gas, and mixes well with the exhaust gas in the duct after being sprayed. As such a deodorant, a conventionally known deodorant can be appropriately selected and used depending on the odor component to be deodorized.For example, ozone, ozone water, ferrous sulfate and a chelating agent are mainly used. (Efnica: Efnica Corporation), a deodorant obtained by combining an iron (II) compound and L-ascorbic acid (see Japanese Patent Publication No. Sho 61-43091), and an ethylenediaminetetraacetic acid as an iron (II) compound. And alum-containing deodorizing composition (see JP-A-60-145143), and a composition in which an organic acid component and a polyaminocarboxylic acid component are combined with an iron (II) compound (Japanese Patent Publication No. 7-12431). And the like are used.

The deodorant is based on the detected odor concentration,
The optimum spray amount and spray time are adjusted together or independently. The application amount of the deodorant is large when the odor is strong, and small when the odor is weak.

That is, when the odor concentration is equal to or higher than the predetermined value, the deodorant is sprayed in an amount required to deodorize the odor component from the exhaust gas. It will move in a mixed state. For this reason, the contact time between the exhaust gas and the deodorant necessary for deodorizing the odor component can be sufficiently ensured.

When the odor concentration of the exhaust gas passing through the exhaust duct 112 becomes lower than a predetermined level, the odor sensor detects the odor concentration, and the deodorant spray device 119 stops spraying the deodorant.

The exhaust duct 1 on the discharge side of the exhaust fan 117
Inside the baffle plate 122, a pressure loss is not so large that the deodorant and the exhaust gas are mixed well.
Are provided at appropriate intervals. The baffle plate 122 forms a turbulent flow in the exhaust gas in the duct, and promotes the mixing action with the deodorant. Instead of such baffles, other suitable means for generating turbulence, such as slits and perforated plates, may be provided in the duct. The embodiment of FIG. 5 may be used in combination with the embodiments of FIGS. 1 to 4 described above.

[0047]

As described above, according to the kitchen exhaust system of the present invention, the odor in the exhaust gas flowing through the exhaust duct by the exhaust fan is reduced by the external air from the external air introduction duct connected to the exhaust duct. Since it is stirred and diluted and discharged at a high speed to a high position in the atmosphere, the odor can be sufficiently diffused in the atmosphere. For this reason, the odor accompanying the exhaust from the kitchen can be sufficiently diluted without using an extra high exhaust duct, making it difficult to be perceived as offensive odor, and reducing adverse effects on the neighborhood.

If a booster fan is provided in the middle of the outside air introduction duct, the booster fan operates and the outside air is introduced at a certain flow rate or more, so that the exhaust air and the outside air are efficiently mixed. After the exhaust gas is stirred and diluted by the outside air in the state, the exhaust gas flow rate and the exhaust gas flow rate are increased to be discharged to a high position in the atmosphere. Therefore, the odor can be more sufficiently diffused and diluted in the atmosphere.

Further, since the booster fan operates according to the odor concentration, it is possible to exhaust a required amount of the kitchen without increasing the wind speed and air volume except when odor is generated, and to use a fan having a small air volume. And no cost increase due to an increase in power cost.

Further, the exhaust fan is a fan that can change the amount of air blow, and has an outside air adjusting damper in the outside air introduction duct, and changes the opening degree of the damper according to the amount of air of the exhaust fan. With such a configuration, the opening degree of the outside air adjustment damper changes in accordance with the change in the air volume of the exhaust fan, and it is possible to introduce diluted outside air in accordance with an increase in the rotation speed of the exhaust fan while keeping the kitchen exhaust air amount constant. Especially when the odor is required to be diluted and diffused, by adjusting the air volume of one exhaust fan on the exhaust duct, the air-fuel mixture diluted and diffused with sufficient external air through the exhaust duct can be quickly increased without disturbing the pressure balance. It is possible to release into the atmosphere at a flow rate.

Further, if a diffusion means for disturbing the flow of the exhaust gas and promoting mixing and dilution with the atmosphere is provided at the discharge port of the exhaust duct, the diffusion means is discharged from the discharge port of the exhaust duct. The flow of exhaust gas is disturbed and promotes mixing and dilution with the atmosphere. And the odor concentration of the exhaust gas can be reduced as much as possible.

Further, according to the kitchen exhaust system of the present invention, when the odor sensor detects a strong odor in the exhaust duct, the deodorant spraying means sprays a gas or liquid deodorant. Automatic operation becomes possible, and the deodorant can be used efficiently. In addition, the exhaust gas has a sufficient contact time with the deodorant in the exhaust duct, so that the odor component is sufficiently removed. Therefore, there is no need to increase the duct size or the space through which the deodorant passes, and to use a large amount of the deodorant. Thereby, a sufficient deodorizing effect can be obtained with a compact deodorizing system in a small space, and equipment costs and operating costs can be reduced.

Further, since a sufficient contact time can be obtained even if the flow velocity is increased, the exhaust gas can be discharged sufficiently high by increasing the discharge speed from the duct outlet, and the deodorizing effect is further enhanced by the dilution and diffusion action. Can be enhanced.

Further, if the deodorant spraying means is configured to adjust the time and / or amount of spraying of the deodorant in accordance with the odor concentration, the deodorant to be sprayed is adjusted to the detected odor concentration. Since the optimum spraying amount and spraying time are adjusted together or independently, the spraying amount of the deodorant is large when the odor is strong and small when the odor is weak. Deodorization is performed with a sufficient amount of contact time by using a minimum amount of deodorant required for removal.
As a result, waste of the deodorizing agent can be eliminated, and the cost can be reduced by efficiently performing the deodorizing only when necessary.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a kitchen exhaust device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a kitchen exhaust device according to a second embodiment of the present invention.

FIG. 3 is an explanatory view of a kitchen exhaust device according to a third embodiment of the present invention.

FIG. 4 is a perspective view of a swirling discharge device provided in the kitchen exhaust device of FIG. 3;

FIG. 5 is an explanatory view of a kitchen exhaust device according to still another embodiment of the present invention.

[Explanation of symbols]

10, 30, 36, 110: Kitchen exhaust system, 11, 11
1: kitchen, 11a, 111a: ceiling, 12, 112: exhaust duct, 13, 34: outside air introduction duct, 13a: outside air introduction port, 14, 113: suction port, 14a: grease filter, 15, 114: discharge port, 16, 115: countertop, 1
7, 116: hood, 18, 32, 117: exhaust fan, 20, 118: odor sensor, 22: booster fan, 31: inverter, 33: outside air adjustment damper, 35:
Pressure sensor, 37: swirl blower, 38: slit, 1
19: deodorant spraying device, 120: storage unit, 121: spraying unit, 121a: nozzle.

Continuing on the front page (72) Inventor: Sei Yamazaki 8-19-20, Higashisuna, Koto-ku, Tokyo Inside Toyo Kanetsu Co., Ltd. (72) Inventor: Yaichi Nakata 6-3-2, Toyo, Koto-ku, Tokyo Inside the Kanto Branch of the Company (72) Inventor Masaharu Iwamiya 2-5-112 Kyobashi, Chuo-ku, Tokyo Toyo Denki Kogyo Co., Ltd. Inside the company (72) Inventor Kenichi Uchiyama 2-5-1 Kyobashi, Chuo-ku, Tokyo Toyo Thermal Industry Co., Ltd.

Claims (9)

[Claims] 1. A kitchen exhaust device for discharging exhaust air from a kitchen to the atmosphere via an exhaust duct by an exhaust fan, wherein an external air introduction duct is provided in the exhaust duct to diffuse and dilute the odor contained in the exhaust gas. A kitchen exhaust device connected on the way. 2. The kitchen exhaust system according to claim 1, wherein a booster fan is provided in the middle of the outside air introduction duct. 3. The exhaust fan is a fan capable of changing the amount of blown air, wherein an outside air adjusting damper is provided in the outside air introduction duct, and the opening degree of the damper is changed according to the amount of air of the exhaust fan. The kitchen exhaust system according to claim 1, wherein the kitchen exhaust system is configured as described above. 4. The exhaust duct according to claim 1, wherein a diffusion means for disturbing the flow of the exhaust gas and promoting mixing and dilution with the atmosphere is provided at an outlet of the exhaust duct. Kitchen exhaust system as described. 5. The kitchen exhaust device according to claim 4, wherein said diffusion means is a swirling blow-out device having a plurality of slits radially arranged by being twisted so that the exhaust air is swirled. 6. The kitchen exhaust system according to claim 4, wherein said diffusion means is a propeller which rotates by exhaust pressure. 7. A kitchen exhaust device for discharging exhaust air from a kitchen to the atmosphere via an exhaust duct by an exhaust fan, wherein the exhaust duct has an odor sensor for detecting an odor concentration in the exhaust gas, and the odor concentration is predetermined. A kitchen exhaust device comprising: a deodorant spraying means for spraying a gas or liquid deodorant when the value is equal to or more than the value. 8. The kitchen exhaust system according to claim 7, wherein said deodorant spraying means adjusts the spray time and / or spray amount of said deodorant according to said odor concentration. 9. The kitchen according to claim 7, wherein a turbulence generating means is provided in the exhaust duct on the discharge side of the exhaust fan to promote mixing of the deodorant and the exhaust. Exhaust device.