JP2007132597A - Simultaneous air supply and exhaust type range hood - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a range hood smoothly collecting oily smoke and waste gas generated by cooking as local ventilation, maintaining an indoor oxygen concentration at 20.5% or more, and facilitating exhaust in a highly airtight house. <P>SOLUTION: Outside air is sucked in from an air supply duct by utilizing an ejector effect in an air current caused by an air fan, and an air curtain like air current blown out of a blow-out opening provided in a front side end lower side portion of the range hood is guided to an exhaust fan. By using the air current as an induction air current, the oily smoke and waste gas generated by cooking is inductively collected. The air fan is operated when using the range hood with the window opened, and in an highly airtight indoor environment with the window closed, by stopping the air fan and operating the exhaust fan, outside air is supplied through the air supply duct, and natural air supply is used as the induction air current. The oxygen concentration is maintained since outside air is included in the induction air current. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a simultaneous supply / exhaust range hood provided above a range for efficiently discharging oily smoke, waste gas, and the like generated by cooking to the outside of the room.

  The simultaneous supply / exhaust range hoods on the market are broadly divided into a natural supply type and a forced supply type, both of which are supplied in conjunction with the exhaust operation. The main use is for airtight houses such as condominiums. With the natural air supply type, if the exhaust operation is performed in an airtight environment, an air supply amount that is almost equal to the exhaust amount naturally enters the room, so there is an economic advantage that no power consumption for air supply occurs. There is. However, if you open the indoor window and operate the range hood, the supply airflow enters from the side of the range hood, and it is easy to cause a problem that oil smoke and waste gas generated by cooking cannot be collected smoothly by the range hood. . The forced air supply type is provided with an air supply fan in addition to the exhaust fan, and mechanically supplies an air supply amount substantially equal to the exhaust amount. Therefore, there is a problem that power consumption is approximately doubled.

The purpose of the range hood is local ventilation. As described in the “Technical Standards for Ventilation and Air-Conditioning Equipment” edited by the Japan Building Equipment and Elevator Center, “Normal use of equipment or appliances that use fire” In order to prevent abnormal combustion, the oxygen content in the living room should be approved by the Minister of Land, Infrastructure, Transport and Tourism as being ventilated to keep the oxygen content at approximately 20.5% or higher. " Therefore, it can be said that the simultaneous supply / exhaust type technique is an appropriate method for maintaining the oxygen concentration at 20.5% or more. On the other hand, it is well known that the user's desired function is how smoothly the oily smoke and waste gas generated by cooking can be collected as local ventilation. As a means of smoothly collecting oil smoke and waste gas, the prior art in which a blower fan is installed in addition to the exhaust fan in order to attract oil smoke and waste gas in the range hood configuration is the range for which the applicant has applied. Although a hood can be mentioned, the airflow induced by the blower fan alone has the effect of facilitating the collection of oil smoke and waste gas, but it does not promote air supply.
JP 2004-300960 A

  The problem to be solved is to smoothly collect oil smoke and waste gas generated by heating cooking as local ventilation and to keep the indoor oxygen concentration at 20.5% or more.

  The air flow of the blower fan, which is the source of the induced air flow, to simultaneously collect oily smoke and waste gas generated by cooking and to keep the indoor oxygen concentration at 20.5% or more at the same time The air is sucked from the natural air supply duct by the ejector effect, and the natural air supply duct has the effect of generating airflow equivalent to a semi-forced air supply device. An attractive airflow including By flowing this induced airflow from the blowout opening provided at the lower part of the front end of the hood to the exhaust fan side in the form of an air curtain, oil and smoke rising from the range can be collected smoothly and fresh outside air can be taken in. This ensures the indoor oxygen concentration.

  In order to blow an air curtain-like induced airflow toward the exhaust fan located at the rear part of the hood from the outlet provided at the lower part of the front end of the hood, the blower fan is applied to the rear part of the ceiling surface of the hood. Since it is arranged, in order to blow the induced airflow from the front side of the hood to the exhaust fan side, it is necessary to devise a U-turn for the wind direction. The air flow induced by the blower fan located at the rear part of the ceiling surface of the hood enters the chamber provided inside the hood, and a flat or arcuate guide plate is inclined at the outlet of the chamber. The airflow is guided to the upper side of the inner surface of the front end portion of the hood. The induced airflow is U-turned along the inner surface of the front end portion of the hood, and an induced airflow is blown out from the air outlet of the hood to the exhaust fan side. As for the blowing angle of the induced airflow, the airflow direction angle can be maintained by the induced airflow hitting the outside of the guide plate provided at the outlet portion of the chamber.

  The source of the induced airflow is a blower fan, but some ingenuity is required to prevent the airflow of the blower fan from being reversely ejected from the air supply duct. In order to suck the air from the air supply duct by the ejector effect, an air supply box composed of a hexahedral housing is provided as an example in the air supply path of the air supply fan, and the air supply duct is connected to the top surface of the air supply duct. The blower outlet of the blower fan arranged outside is connected to the front side, and the air blower outlet of the blower fan is provided on the front side. Provide a partition plate that separates the opening of the air supply duct and the air flow path inside the housing so that a smooth ejector effect can be exerted on the air supply duct when the blown airflow of the blower fan passes through the air supply box This makes it possible to suck outside air.

  When the air supply duct is provided in the range hood, outside wind or the like enters the room through the air supply duct when the operation is stopped, and there is a concern about energy loss such as heating and cooling. If a wind pressure shutter is built in the exhaust duct side, it becomes a countermeasure against outside wind, but even if a wind pressure shutter is provided on the air supply duct side, it is insufficient as a countermeasure against outside wind. In the present invention, the electric shutter is provided so that outside air does not enter the room from the air supply duct when the operation is stopped. By providing an electric shutter on the air supply duct side, the electric shutter is opened when the range hood is in operation, and the electric shutter is closed when the range hood is operated.

  If the induced airflow can be adjusted arbitrarily depending on the contents of cooking and the usage environment, a smoother collection effect can be expected. Therefore, the rotational speed of the blower fan that is the source of the induced airflow can be adjusted.

  As a means of pursuing further energy saving, when operating in a highly airtight indoor environment where natural air supply air can be sufficiently secured from the air supply duct, a simple method such as variable resistance using a DC motor for rotational drive of the blower fan The system adopts a configuration in which the operation stops arbitrarily or automatically. In the case of a house with high airtightness, even if the blower fan is stopped, outside air can be taken in by opening the electric shutter.

  Since the appropriate blowing air blowing angle varies slightly depending on the distance between the cooking device and the range hood, the direction of the guiding air flow can be adjusted so that the appropriate air flow can be provided by adjusting the angle of the guide plate. ing.

  The reason why the forced air supply type is desired over the natural air supply type, even in the simultaneous supply / exhaust type, seems to be the result of a compromise in which comfort is selected over economy. However, energy saving and economic efficiency are the essence that users want, and responding to the essence of users is the mission of manufacturers that provide products. According to the present invention, it is of course applicable when a simultaneous air supply / exhaust type is required in a highly airtight house such as an apartment, and can also be applied to a general detached house.

  The best mode of the simultaneous supply / exhaust type range hood of the present invention uses a DC motor and a cross fan having a diameter of 60 mm as the blower fan, which is the source of the induced airflow, so as to facilitate energy saving and speed adjustment. The structure of the range hood is divided into a hood main body and a filter main body, the filter main body is disposed on the rear side of the hood main body, and an exhaust fan (sirocco fan) is placed inside the filter main body. The air supply duct and the exhaust duct are arranged on the top surface of the hood body. The induced air current blows out from the lower part of the front end of the hood body, and is sucked into the filter body to smoothly collect oil smoke and waste gas generated by heating cooking.

  FIG. 1 is a perspective view from above showing the entire simultaneous supply / exhaust type range hood 1 according to an embodiment of the present invention. The main body of the casing structure that is the basis of the range hood is composed of a hood main body 2 and a filter main body 3. Refer to FIG. 3 and FIG. 5 for the respective symbols and names not described in FIG. An air supply duct 4 and an exhaust duct 10 are disposed at a rear portion of the ceiling surface of the hood main body 2, and an exhaust box 11 serving as a spacer is provided between the exhaust duct 10 and the hood main body 2. A hexahedral air supply box 6 for connecting the duct is provided under the air supply duct 4 and an electric shutter 5 is installed therein. A blower fan 7 and a DC motor 8 that drives the blower fan 7 are provided on the rear surface of the air supply box 6, and the motor is connected so as to be controllable by a blower governor 15 described later. Similarly, an exhaust operation switch 12 for exhausting the range hood, an exhaust speed controller 13 for adjusting the speed of the exhaust fan 20, and a blower operation switch for operating the blower fan 7 are disposed at the front end of the hood body 2. 14 and a blower speed regulator 15 for adjusting the speed of the blower fan 7 are provided. The electric shutter 5 opens and closes in conjunction with the exhaust operation switch 12. A joint sleeve 27 connects the ducts.

  FIG. 2 is a perspective view illustrating a part of the blower fan of the present invention. The blower is a cross-fan type blower fan 7, and includes a fan casing 9 and a DC motor 8. The blown air from the blower fan 7 is blown out from the opening on the front side surface of the air supply box 6 constituting the blower path. A partition plate 17 serving as an ejector effect is provided in the air supply box 6, and a space is provided so that the lower side of the partition plate serves as the air flow path of the blower fan and the opening of the air supply duct is located above the air supply box 6. A part of is separated. The blown air that has passed through the air supply box is guided to the chamber 23, spreads over the entire width of the hood, and flows out from the air outlet 19 in the form of an air curtain.

  FIG. 3 is a perspective view from below showing the entire range hood of the present invention. A chamber plate 18 constituting the lower portion of the air outlet 19 and the chamber 23 is provided in the lower part of the front end of the hood body 2, and the filter 16 is provided in the front part of the filter body 3.

  FIG. 4 is a perspective view illustrating a part of the exhaust fan according to the present invention. A sirocco fan type exhaust fan 20, a spinner 21, a scroll 22, and a DC motor 26 are provided inside the filter body 3. By operating the exhaust fan 20, the inside of the filter body 3 can be set to a negative pressure and air can be sucked in the entire surface of the filter 16. It is like that. The DC motor 26 is connected so that the exhaust operation switch 12 provided at the front end of the hood is turned on and the rotational speed is controlled by the exhaust speed adjuster 13.

  FIG. 5 is an explanatory diagram showing the structure of the present invention. The inside of the filter main body 2 that is inside the filter 16 becomes negative pressure by the operation of the exhaust fan 20. By operating the blower fan 7 provided in the hood main body 2, blown air is blown into the chamber 23 from the lower part of the partition plate 17 through the air supply box 6. The blown air that has been blown is guided to the guide plate 24, and goes from the air outlet 19 provided at the lower part of the end along the inner surface of the front end 25 of the hood to the filter main body (exhaust fan side) having negative pressure. Blown out. This serves as an induced airflow, and has the effect of smoothly collecting oil smoke and waste gas generated by cooking. If the shutter is opened and closed in conjunction with the operation and stop of the exhaust fan 20 and the indoor window is closed, the electric shutter 5 is supplied with the same amount of outside air as that discharged by the exhaust fan. From the duct 4 through the chamber 23 of the hood main body 2, the air is blown out from the air outlet 19, and the effects of air supply and induced airflow can be achieved.

  Unlike the forced air supply device, the present invention is a natural air supply system. Therefore, when the indoor window is opened, the air supply enters from the side having a large area and less resistance. May not blow out. In that case, if the air blowing operation switch 14 is turned on, the air blowing fan 7 starts operation, and an induced air flow is generated from the air outlet 19. Further, due to the action of the blower fan 7 and the partition plate 17, air is also supplied from the air supply duct 4 by the ejector effect. The air sucked in from the intake side of the blower fan 7 plays a role of attracting air and being collected by the range hood even if waste gas that could not be collected by the range hood stagnates on the ceiling. Can do. Further, as a ripple effect of the present invention, the blowing sound generated when the indoor window is slightly opened is also eliminated, and the induced airflow generated from the air outlet 19 can be expected to be effective in preventing condensation on the chamber plate 18.

  As described above, in a social situation where highly airtight houses continue to increase, it is expected that the exhaust type range hood will change to the simultaneous supply / exhaust type range hood. As a result of pursuing energy saving (economic efficiency) and comfort, the present invention not only eliminates the disadvantages of the simultaneous supply / exhaust range hood with a natural air supply type, but also provides a new It is intended to collaborate with the induced airflow, which is a function, and is expected to be widely used as a new simultaneous supply / exhaust range hood. Considering the recent widespread use of the IH range, a simple combination of a hood and an exhaust, such as a conventional range hood, that only captures the updraft generated from the gas range. It is desirable to evolve into a range hood that has a function of generating and capturing oily smoke and waste gas, and is suitable for local exhaust applications.

It is a perspective view from the upper part which shows the whole range hood of this invention. Example 1 It is a perspective view which shows a ventilation fan. Example 1 It is a perspective view from the lower part which shows the whole range hood of this invention. Example 1 It is a perspective view which shows an exhaust fan. Example 1 It is explanatory drawing which shows the structure of the range hood of this invention. Example 1

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Range hood 2 Hood main body 3 Filter main body 4 Air supply duct 5 Electric shutter 6 Air supply box 7 Blower fan 8 DC motor 9 Fan casing 10 Exhaust duct 11 Exhaust box 12 Exhaust operation switch 13 Exhaust speed controller 14 Blower operation switch 15 Blower speed controller 16 Filter 17 Partition plate 18 Chamber plate 19 Air outlet 20 Exhaust fan 21 Spinner 22 Scroll 23 Chamber 24 Guide plate 25 Hood front side 26 DC motor

Claims (6)

  A range hood provided with a blower fan and an exhaust fan, wherein a supply duct that communicates with outside air is provided on a side of a blower fan, and an induced airflow that draws outside air from the supply duct by blowing is provided on a front side of the hood. An air curtain-like airflow is formed from an air outlet provided in the lower part of the end portion and sprayed toward the exhaust fan disposed in the rear part of the hood, and the oil smoke and waste gas generated by heating cooking are in the form of the air curtain. A simultaneous supply / exhaust range hood that is exhausted by being drawn into an exhaust fan while being attracted by the airflow of   A guide plate is provided at an outlet portion of the chamber for guiding the induced airflow to guide the induced airflow above the inner surface of the front end of the hood so that the induced airflow blows out from the air outlet along the inner surface. 1. A simultaneous supply / exhaust range hood according to 1.   An air supply box is arranged in the air supply path of the air supply fan, an air supply duct is connected to a part of the air supply box, and a part between the air supply path and the opening of the air supply duct is separated. The simultaneous supply / exhaust type range hood according to claim 1, further comprising a partition plate for assisting air supply.   The simultaneous supply / exhaust type range hood according to any one of claims 1 to 3, further comprising an electric shutter for preventing outside air from entering from an air supply duct when the operation is stopped.   The simultaneous supply / exhaust type range hood according to any one of claims 1 to 4, further comprising a speed adjuster for adjusting a rotation speed of the blower fan.   The simultaneous supply / exhaust type range hood according to any one of claims 1 to 5, wherein an inclination angle of the guide plate with respect to the chamber is adjusted to adjust a wind direction of the induced airflow.

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