JPH10103727A - Range hood device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase smoke-discharging capability and prevent smoke from leaking from a range hood into a room by providing a smoke concentration detecting means along a smoke discharge flow passage of the range hood and controlling the rotation of a fan motor to a rotational speed suitable for smoke concentration on the basis of information from the smoke concentration detecting means. SOLUTION: A switch 12 or 13 is switched on to actuate a light-emitting drive circuit 4 through a microprocessor unit 5, and a smoke passing hole 1 is irradiated with measuring light emitted from a light-emitting element 2. The transmitted light is received by a light-receiving element 6, and a maximum voltage value V0 of a voltage value amplified after A/D conversion by a light- receiving circuit 7 is held by a peak hold circuit 9 to be stored. In the case where the maximum voltage value V0 exceeds a fixed voltage value, a relay 20 is actuated by a transistor 21 to change over the operation of a fan motor 26 to a 'turbo-operation mode' in which smoke-discharging capability is great, and operation in this mode is continued for a fixed period of time while putting a light to a turbo-operation indicating lamp 11. By this constitution the leakage of smoke from a range hood into a room can be prevented.

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 comprising a range hood body, a sensor and a control device, and in particular, automatically controls a smoke discharge capacity according to the amount of smoke discharged from a heating device. To a range hood device.

[0002]

2. Description of the Related Art A conventional range hood device of this type will be described with reference to FIG. 4. In the drawing, reference numeral 30 denotes a fan motor, 31 denotes a switch for selecting a "strong mode" for smoke exhaust capability, and 32 denotes a smoke exhaust switch. Set the "weak mode" selection switch of the ability to 3
3 is a range hood lamp, 34 is a range hood lamp operation switch, 35 is a starting capacitor, and 36 is 1
00V AC power supplies are shown, and these are connected so as to operate organically.

[0003] However, in the above-mentioned conventional range hood device, the smoke exhausting capability of the fan is fixed to two modes, a "strong mode" and a "weak mode". If a large amount of smoke is generated temporarily as in, etc., part of this smoke will not be collected by the range hood itself and will overflow into the room, causing stains on the kitchen wall, floor, ceiling, etc. At present, there is a strong demand for this improvement.

[0004] The present invention has been made in view of the above situation, and its purpose is to collect in a normal operation mode, such as when a large amount of smoke is generated temporarily. Even if a large amount of smoke is generated, a range hood device that can automatically detect this and increase the smoke exhaust capacity, effectively preventing smoke from leaking from the range hood into the room. It is something to offer.

[0005]

In order to achieve the above object, in a range hood device according to the present invention, smoke density detecting means is provided in a smoke exhaust passage of the range hood, and the smoke density detecting means is provided. , The rotation of the fan motor is controlled at a rotation speed adapted to the smoke density.

Further, in the present invention, the smoke density detecting means is composed of a light emitting element and a light receiving element provided opposite to the smoke exhaust passage, because the structure is simple and the operation control is easy. Desirably, in this case, the rotation speed of the fan motor is controlled based on the absorbance received by the light receiving element.

Further, according to the present invention, the smoke concentration detecting means keeps the rotation speed of the fan motor in the fastest mode when the concentration of smoke flowing through the smoke exhaust passage exceeds a predetermined value or more. It is desirable to control so as to rotate with time.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

The basic configuration of a range hood device according to this embodiment will be described with reference to FIG. 1. In the figure, reference numeral 1 denotes a smoke passage hole provided in a smoke exhaust passage of a range hood body (not shown). 2, a light emitting element, 3 a light emitting circuit, 4 a light emitting drive circuit, 5 a microprocessor (MPU), 6 a light receiving element, 7 a light receiving circuit, 8 an amplifying circuit, 9 a A peak hold circuit, 10 is an amplification circuit, 11 is a turbo operation display lamp, 12 is a switch for setting the fan rotation speed to “strong mode”, and 13 is a fan rotation speed for “weak mode”. Reference numeral 14 denotes an "off" switch for stopping the operation of the fan, and reference numeral 15 denotes an on / off switch of the illumination lamp 22 of the range hood.

An output signal from the microprocessor 5 is supplied to a relay 16 for turning on / off a fan motor.
And a transistor 17 for driving this relay 16,
“Strong” and “Weak” operation switching relay 18 and this relay 1
8, a turbo operation relay 20 for rotating the fan motor at the highest speed when the smoke density is high, a transistor 21 for driving this relay 20, and a relay for turning on / off the illumination lamp 22 of the range hood. 23 and a transistor 24 for driving the relay 23. The symbol 25 in the figure is AC1
A 00V power supply and 26 is a fan motor of a range hood fan.

In the range hood device configured as described above, when either the switch 12 or 13 is selected and turned on, the microprocessor 5 activates the light emission drive circuit 4 to cause the light emission element 2 of the light emission circuit 3 to operate. Irradiates the smoke passing hole 1 with the measuring light, receives the transmitted light by the light receiving element 6, amplifies the A / D converted voltage signal by the light receiving circuit 7 by the amplifier circuit 8, and amplifies the amplified voltage value. The maximum voltage value V _{0 is held} by the peak hold circuit 9 and stored. The smoke density measurement method using the light-emitting element 2 and the light-receiving element 6 is a known absorbance measurement method in which the absorbance of light transmitted through the smoke is converted into a voltage by converting the amount of light received by the light-receiving element 6 into a voltage. Since this is the same as the method, the detailed description is omitted here.

The relationship between the smoke density and the maximum voltage value V ₀ as shown in FIG. 2 is input and stored in the microprocessor 5 in advance.

Accordingly, the maximum voltage value V ₀ input from the peak hold circuit 9 to the microprocessor 5 is as shown in FIG.
In the case of exceeding a predetermined voltage value (constant smoke density) V ₁ is shown, the microprocessor 5 activates the transistor 21 to activate the relay 20, the flue gas than the fan motor 26 "strong mode" The operation mode is switched to the "turbo operation mode" having a large capacity, the operation is controlled so that the state is maintained for a certain time, and the turbo operation indicator lamp 11 is turned on. This operation time can be set by, for example, a known timer circuit.

FIG. 3 shows another example of the control of the fan motor by the microprocessor 5. In this example, when the light emitting element 2 and the light receiving element 6 are contaminated with smoke or the like and the sensitivity is lowered, this is notified. If the output voltage V _{0 in the} absence of smoke changes from Z ₀ to Z ₂ through Z ₁ in the drawing to make the setting, a certain threshold voltage V ₂ is set in the microprocessor 5 in advance, The output voltage when there is no smoke is the threshold voltage V ₂
Is exceeded, the light emitting element 2 and the light receiving element 6 are urged to be cleaned or replaced, for example, by a turbo operation indicator lamp 11.
Is configured to blink for a certain period of time.

[0015]

As described above, according to the range hood device of the present invention, as in the case where a large amount of smoke is generated temporarily, an amount of smoke that cannot be collected in the normal operation mode is generated. Even if it occurs, this can be automatically detected to increase the smoke exhaust capacity, and it is possible to effectively prevent the smoke from leaking from the range hood into the room and contaminating the room, When the amount of smoke is small, the operation can be performed in the mode with a small amount of air, so that there is an excellent effect that the kitchen can be maintained in a quiet environment with low noise.

[Brief description of the drawings]

FIG. 1 is a control circuit diagram of a range hood device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of smoke density characteristics in the same device.

FIG. 3 is an explanatory diagram showing another example of smoke density characteristics in the device.

FIG. 4 is a control circuit diagram of a conventional range hood device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Smoke passage hole 2 Light emitting element 5 Microprocessor (MPU) 6 Light receiving element 11 Turbo operation indicator lamp

Claims (3)

[Claims] 1. A smoke density detecting means is provided in a smoke exhaust passage of a range hood, and the rotation of a fan motor is controlled at a rotation speed adapted to the smoke density based on information from the smoke density detecting means. A range hood device that is made. 2. The smoke density detecting means comprises a light emitting element and a light receiving element provided opposite to the smoke exhaust passage, and a rotational speed adapted to the smoke density based on the absorbance received by the light receiving element. The range hood device according to claim 1, wherein the rotation of the fan motor is controlled by: 3. The smoke density detecting means controls the fan motor to rotate in a maximum speed mode for a predetermined time when the density of smoke flowing through the smoke exhaust passage exceeds a predetermined value or more. 3. The method according to claim 1, wherein
The range hood device according to any one of the above.