JPS593295Y2 - ventilation system - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ventilation device for discharging flames generated in a cooking area and oily smoke generated during cooking, which notifies the user of the occurrence of flames.

Most fires that occur in the kitchen are caused by cooking utensils that are in use, and some fires occur when people leave the kitchen without extinguishing the fire because they are attending to guests, making phone calls, caring for children, or other errands while cooking. The fire occurred because the worker did not return to the kitchen for a certain period of time.

However, conventional ventilation devices installed in cooking areas have only been used to exhaust oily smoke generated during cooking.

Some conventional ventilation systems are equipped with smoke detectors that detect smoke generated during cooking and automatically operate ventilation fans; If this happens, flames will be emitted along with the smoke, so if a collective duct is installed that communicates with the ventilation system installed in each room, such as in an apartment complex, and a collective exhaust is used, flames may enter the duct. There was a risk that the flames would flow into adjacent rooms and spread the fire.

For this reason, a fire damper was installed in the individual ducts that connected the collective duct and the ventilation system installed in the room, and was equipped with a damper that was fused by flame and closed off the individual ducts.

However, these ventilation systems did not have an alarm function, and there was a problem in that the detection of a fire was delayed, leading to a large fire.

In addition, a fire alarm system is installed on the ceiling of the cooking area to alert you to the occurrence of a fire by detecting the smoke generated when a fire occurs or by sensing the temperature of the flame. However, even in this case, the distance from the cooking utensils that are the source of the fire is considerable, and it takes time for the fire alarm to activate, which increases the size of the fire and makes it difficult to extinguish it.

This invention consists of a detection device that detects flame light when flame enters the hood of a ventilation system that exhausts oily smoke generated during cooking in a cooking area, and a buzzer that sounds in response to a signal from the detection device. In addition, when the flame light is detected by the detection device, the operation of the ventilation fan built into the hood is stopped, preventing the flame from being sent into the duct by the ventilation fan, and preventing the fire from spreading to adjacent rooms, etc. At the same time, in order to efficiently ventilate the oil smoke generated during cooking, a detection device that detects the light of the flame is installed in the hood that is installed to efficiently detect the flame and notify you of the occurrence of a fire. This is what we got with the ventilation system.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

Reference numeral 1 denotes a hood provided on a cooking appliance 2, which has an inlet 3 on its bottom surface and an exhaust port 6 that communicates with a ventilation duct 5 provided on a wall 4 on its back surface.

7 is a shutter provided at the exhaust port 6; 8 is a blower attached to the upper plate of the hood concavity so as to send oil smoke sucked in from the suction port 3 of the hood 1 to the exhaust port 6; 9 is a suction port of the blower 8; , 10 is a notification device provided on the back side of the front panel of the hood], and a detection device 11 using a light detection element 12 such as CDS that detects the light of the flame when flame enters the hood 1.
A buzzer 13 that sounds in response to a signal from the detection device 11 is provided.

The detection device 11 supports a cylindrical portion 14 that is open obliquely upward so that the opening faces the wall 4 side and is substantially horizontal, and a detection element 12 such as a CDS is housed in the cylindrical portion 14. There is.

Figure 2 is an electrical circuit diagram of the ventilation system of the present invention.
A normally closed contact 1 is connected to the primary side of the transformer 16 connected to the
A blower 8 with a manual switch 18 connected in series and a buzzer 13 with a normally open contact 19 connected in parallel, a rectifying and smoothing diode D1 and a capacitor C1 are provided on the secondary side of the transformer, and a transistor TR1, TR2
, resistor R1, R2, R3, R4゜capacitor C2, relay switch R that operates normally closed contact 17 and normally open contact 19
A Schmitt circuit is formed by Y, and the variable resistor VR is set so that the transistor TR is normally ON and the transistor TR2 is OFF.

Therefore, under normal conditions, the relay switch RY is not operated, and the normally closed contact 17 connected to the electric circuit of the blower 8 is closed, and the blower 8 is operated by turning on the manual switch 18.

On the other hand, since the normally open contact 19 connected to the electric circuit of the buzzer 13 is in an open state, the buzzer 13 does not sound.

Next, when a fire occurs and light enters the photodetector element 12, the resistance value of the photodetector element 12 decreases, transistor TR1 of the Schmitt circuit turns OFF, and transistor TR2 turns ON.
The state is always reversed, and as a result, the transistor TR
The relay switch RY connected to the collector circuit 2 is activated, the normally closed contact 17 is opened, and the operation of the blower 8 is stopped, while the normally open contact 19 is closed and the buzzer 13 sounds.

Since the present invention is constructed as shown above, when used as a normal ventilation device, the blower 8 is operated by turning on the manual switch 18, and the shutter 8 is opened by the wind pressure of the blower 8, thereby reducing the amount of air generated during cooking. Oily smoke is sucked in through the suction port 3 of the hood 1, and is discharged outdoors by the blower 8 for ventilation.

At this time, gas flame etc. for cooking comes out from cooker 2,
Since the entrance of the light of the detection device 11 is directed obliquely upward, the light does not enter the light detection element 12, so that the blower 8 continues to operate.

Next, when a fire occurs on the cooking appliance 2, the flame is sucked into the hood 1 by the air flow taken in by the blower 8, so the light detection element 12 provided in the detection device 11 receives the light from the flame. The resistance of the sensing element 12 decreases, and the transistor TR2, which is normally OFF, turns ON as shown above.
When the relay switch RY is activated, the normally closed contact 17 connected to the electric circuit of the blower 8 is opened and the operation of the blower 8 is stopped, and the normally open contact 19 connected to the electric circuit of the buzzer 13 is closed and the buzzer 13 is closed. The alarm sounds to alert you to the occurrence of a fire.

This invention is equipped with a detection device that detects the light when flame enters the hood of a ventilation system, and the signal from the detection device activates a relay switch to sound a buzzer and stop the operation of the ventilation system's blower. This allows you to attend to guests, make a phone call, take care of children, or otherwise leave the cooking area while cooking, and if a fire breaks out in the cooker, the flames emitted from the cooker will be inside the hood. When a person enters the room, the detection device is activated, the buzzer sounds, and the blower stops operating, so you can know that a fire has broken out by the sound of the buzzer, and the shutter closes as the blower stops operating. It is closed to prevent flames from entering the duct through the exhaust port, and to prevent flames from traveling through the duct to enter the next room and spread the fire.A detection device is installed inside the hood of the ventilation system to detect the light of the flame. As a result, the flames emitted from the cooker are sucked into the hood by the blower, allowing for faster detection.As a result, fires can be detected earlier and extinguishing activities can be carried out before the fire becomes a major fire, increasing safety. This will have great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a ventilation system according to an embodiment of the present invention, and FIG. 2 is an electrical circuit diagram thereof. 1...Hood, 3...Suction port, 8...
...Blower, 11...Detection device, 13...
····buzzer

Claims (1)

[Scope of utility model registration request] A ventilation system consisting of a detection device that detects flame light entering an inlet, a buzzer that notifies flame detection based on the output of the detection device, and a blower whose power is turned off and the operation is stopped based on the output of the detection device.