JPH04169727A - Smoke removal device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a smoke evacuation device for removing oily smoke generated during cooking, and more particularly to a smoke evacuation device equipped with a detection sensor for preventing tempura fires. It is.

BACKGROUND OF THE INVENTION Conventionally, as shown in FIG. 22, this type of smoke evacuation device has a hood 3 having an open suction port 2 facing above a cooking appliance 1 to remove oil smoke trapped in the hood 3. A configuration is adopted in which the air is discharged outdoors using an exhaust fan 4. On the other hand, as a means of detecting a tempura fire, an infrared temperature sensor 5 is disposed inside the hood 3 at a position directly facing the cooker, and an alarm 6 is disposed outside the hood 3. . Furthermore, a removable grease filter 7 is provided near the inlet 2 of the hood 3 in order to separate the oil contained in the oil smoke.6 The temperature sensor 5 and alarm 6 are controlled by a controller 8. be done. In addition, the solid line arrow in FIG. 22 indicates the air flow caused by the exhaust fan 4, and the
A block diagram of the control system in Figure 3 is shown.

When the exhaust fan 4 is driven with the above configuration, the exhaust air 11 is discharged from the intake port 2.
14 is generated, and oil smoke and the like generated along with the air flow sucked from the suction port 2 are sucked into the hood 3. On the other hand, the temperature of the cooking appliance 1 is constantly monitored by an infrared temperature sensor 5, and in the event of an abnormality, an alarm 6 is activated via a controller 8 to notify of the abnormality. Note that the oil and fat in the oil smoke adheres to the grease filter 7 provided at the intake port 2 and is separated, and the purified air is discharged outdoors.

Problems to be Solved by the Invention However, with the above configuration, for example, a flaming phenomenon during cooking of grilled fish or Chinese food is also detected as an abnormality, so there is a problem that it cannot be accurately distinguished from a tempura fire, resulting in malfunction.

The present invention solves these problems by clearly separating and detecting the processes that lead to tempura fires and other cooking-related flames, thereby accurately detecting tempura fires before they cause flames. The present invention provides a smoke evacuation device.

Means for Solving the Problems In order to solve the above problems, the present invention provides, as a first means, a smoke amount detection means in a smoke exhaust hood that discharges smoke, and detects smoke from the output signal of the smoke amount detection means. This device is equipped with analysis means for analyzing the concentration of smoke and the range of changes in smoke concentration within a certain period of time.

Further, as a second means, a smoke amount detection means is provided in the smoke exhaust hood that discharges smoke, and an analysis means is provided for analyzing the smoke concentration and the frequency component of the smoke concentration change from the output signal of the smoke amount detection means. It was established.

Furthermore, as a third means, a smoke amount detection means is provided in a smoke exhaust hood that discharges smoke, and the output signal of the smoke amount detection means is used to determine the smoke concentration, the range of change in smoke concentration within a certain period of time, and the smoke concentration. This is provided with analysis means for analyzing the frequency components of changes.

Operation: With the above configuration, changes in the concentration of oil smoke sucked into the smoke exhaust hood are detected. On the other hand, by knowing the smoke density and the range of change from the output signal from the smoke amount detection means, it is possible to distinguish between advance information leading to a tempura fire and other cooking, and to operate a safety device.

Further, by knowing the smoke concentration and the frequency component of the concentration change from the output signal from the smoke amount detection means, it is possible to more accurately discriminate and operate the safety device.

Furthermore, by knowing the smoke concentration, the variation width of the concentration, and its frequency component from the output signal from the smoke amount detection means, it is possible to make a more accurate determination and operate the safety device.

EXAMPLE Hereinafter, a first example of a smoke evacuation device of the present invention using a transmission type photoelectric sensor as a smoke amount detection means will be explained based on FIGS. 1 to 7. In FIG. A smoke exhaust hood 14 having an inlet 13 opened facing the heating part 12 of the vessel 11 is provided on the side, and one end of the smoke exhaust hood 14 extends through the wall 15 of the house to face the outdoors, and It is connected to a smoke exhaust duct 18 having an outlet 17 in which a blower 16 is arranged. Further, inside the smoke exhaust hood 14, a transmission type photoelectric sensor is arranged as a smoke amount detection means 19 in order to detect a tempura fire in advance. As shown in FIG. 2, the light projector 19a and light receiver 19b of the transmission type photoelectric sensor face each other with a gap between them, and are arranged so that the oil smoke in the smoke exhaust hood 14 passes between them.

Further, as shown in FIG.
The signal is guided to an analysis means 24 consisting of a logic circuit 23, and the concentration of smoke and the range of change in concentration over a certain period of time δ are computationally analyzed. On the other hand, the fuel supply pipe 25 that supplies fuel to the cooking device 11 is provided with a circuit breaker 26 that cuts off the fuel, and the analysis means 24
A controller is installed to control the operation of the circuit breaker 26, exhaust blower 16, or alarm 27 based on the analysis results. Note that a grease filter 29 is arranged near the suction port 13 to separate oil from the inhaled oil smoke. Solid line arrows indicate air flow by the exhaust blower 16, FIG.
5 is a logic circuit diagram showing an example of the analysis means 24, and FIGS. 6 and 7 show the characteristics of the voltage output signal from the detection means 19.

Next, the operation of detecting a tempura fire by the transmission type photoelectric sensor 19 in the above configuration will be explained. As shown in FIGS. 1 and 2, a deep fryer 30 is connected to the heating section 12 of the cooking device 11.
At the same time as heating the food and starting cooking, the exhaust air blower 811
By operating 6, oil smoke is sucked in from the suction port 13 and a collection operation is started. On the other hand, a large amount of oil smoke generated by the overheating of the oil in the deep fryer 30 is sucked into the smoke hood 14.
The light from the light projector 19a is blocked, and the amount of light flowing into the light receiver 19b is significantly reduced. The smoke amount detection means 1 considers this significant decrease in the amount of light received as a situation immediately before a tempura fire occurs.
9 is what is detected. Here, in the electrical signal obtained by the smoke amount detection means 19, there is a phenomenon peculiar to a tempura fire. This phenomenon will be explained below in comparison with grilled fish, which produces the most amount of smoke when cooking with edible oil and with other cooking methods. That is, as shown in FIGS. 6 and 7, the widths of change δ1 and δ2 of the smoke density during the fixed time δ are significantly different between the two. Here, in FIGS. 6 and 7, the vertical axis represents the electrical signal from the smoke amount detection means 19, that is, the voltage proportional to the smoke concentration, and the horizontal axis represents the time t.
The figure shows the case of heating edible oil, and Figure 7 shows the case of grilled fish.

Next, the flow of the control system will be explained using the flowchart shown in FIG. 4 and the logic circuit shown in FIG. Simultaneously with the operation of the cooking device 11, the circuit breaker 26 is opened (Sl step), and fuel is supplied to the cooking device 11.

Then, the output signal ■1 from the light receiver 19b is sent to the comparison circuit 20.
In addition to the standard voltage set in advance■.

On the other hand, the output voltage ■1 is stored in the memory circuit 21, and the arithmetic circuit 22 calculates the change width δ of the output voltage ■1 for a certain period of time δ, and the comparison circuit 20' In addition to , the change width δ is roughly set. (6
゜kuδt) (S3 step). And ■ in the logic circuit 23. ku■, and δ. <If δ1 is satisfied, the circuit breaker 26 is closed (step S4) and the alarm 2 is
7 (35 staves). That is, by analyzing the amount of oily smoke sucked into the smoke exhaust hood 14 and its change content, tempura fires are distinguished from other types of cooking.

Next, a second embodiment of the smoke evacuation device of the present invention using a transmission type photoelectric sensor as the smoke amount detection means is shown in FIGS. 8 to 1.
This will be explained based on Figure 3. In the figure, a smoke exhaust hood 14 having an inlet 13 with one end facing the heating part 12 of the cooking device 11 is provided on the side, and the smoke exhaust hood 14 has one end that penetrates the wall surface 15 of the house and is installed outdoors. It is connected to a smoke exhaust duct 18 having an exhaust port 17 facing the air and disposed with an exhaust air blower 8116.

A transmission type photoelectric sensor is disposed inside the smoke exhaust hood 14 as a smoke amount detection means 19 in order to detect a tempura fire in advance. And the transmission type photoelectric sensor floodlight 1
9a and the light receiver 19b are spaced apart from each other (see FIG. 9), and are arranged so that the oil smoke flowing inside the smoke exhaust hood 14 passes between them. Further, the electric signal from the light receiver 19b is transmitted to the comparison circuit 20, the frequency analysis circuit 21, and the arithmetic circuit 2.
2. The smoke is guided to an analysis means 24 (see FIG. 12) comprising a logic circuit 23 to analyze the density of smoke and frequency components of changes in density. On the other hand, a circuit breaker 26 for cutting off the fuel is provided in the fuel supply pipe 25 that supplies fuel to the cooking device 11, and the operation of the circuit breaker 26, the exhaust blower 16, or the alarm 27 is controlled based on the analysis result by the analysis means 24. A controller 28 is provided. Note that a grease filter 29 is arranged near the suction port 13 to separate oil from the inhaled oil smoke. The solid arrow indicates the flow of air due to the exhaust air blower $116. FIG. 9 is a sectional view showing the details of the surrounding area where the smoke amount detection means 19 is provided, FIG. 10 is a block diagram of the control system, FIG. 11 is a flowchart of the control system, and FIG. 12 is an example of the analysis means 24. The logic circuit diagram shown in FIG. 13 shows the frequency characteristics of the output signal from the detection means 19.

Next, the operation of detecting a tempura fire by the transmission type photoelectric sensor 19 in the above configuration will be explained. As shown in FIGS. 8 and 9, a deep fryer 30 is connected to the heating section 12 of the cooking device 11.
At the same time as heating the food and starting cooking, the exhaust air 111
By operating 6, oil smoke is drawn into the suction port 13 and a collection operation is started. On the other hand, a large amount of oil smoke generated by overheating of the oil in the deep fryer 30 is sucked into the smoke exhaust hood 14, blocks the light from the projector 19a, and significantly reduces the amount of light flowing into the light receiver 19b. The smoke amount detection means 19 detects this significant decrease in the amount of received light as a situation immediately before a tempura fire occurs. Here, in the electrical signal obtained by the smoke amount detection means 19, there is a phenomenon peculiar to a tempura fire. This phenomenon will be explained below in comparison with grilled fish, which produces the most amount of smoke when cooking with cooking oil and when cooked with other types of cooking. As shown in Figure 13, in the frequency range below 2007, in the case of grilled fish, the smoke density decreases at a constant rate as the frequency increases, but in the case of cooking oil, there is an inflection point a in the middle. It has the property of becoming Here, the vertical axis shows the voltage proportional to the smoke concentration, and the horizontal axis shows the characteristics with frequency. The solid line shows the case when cooking oil is heated, and the broken line shows the case when grilled fish.

Next, the flow of the control system will be explained using the flowchart shown in FIG. 11 and the logic circuit shown in FIG. 12. Simultaneously with the operation of the cooking appliance 11, the circuit breaker 26 is opened (Sl step) and fuel is supplied to the cooking appliance 11. Then, the output signal ■1 from the light receiver 19b is added to the comparison circuit 20, and the preset mark 1! Voltage ■. Compare with (S2
step). On the other hand, the output voltage ■, the frequency analysis circuit 21
The calculation circuit 22 calculates the frequency characteristics and calculates the state in which the voltage proportional to the smoke concentration decreases as the frequency increases.
to calculate the existence of the inflection point a (S3 step).

And ■ in the logic circuit 23. If it is 1 and the inflection point a exists, the circuit breaker 26 is closed (step S4) and the alarm 27 is activated (step S5). That is, by analyzing the amount of oily smoke sucked into the smoke exhaust hood 14 and the frequency components of its changes, a tempura fire is distinguished from other types of cooking.

Next, a third embodiment of the smoke evacuation device of the present invention using a transmission type photoelectric sensor as the smoke amount detection means will be described with reference to FIGS. 14 to 21. In the figure, a smoke exhaust hood 14 is provided on the side and has an inlet 13 with one end facing the heating section 12 of the cooking device 11.
is connected to a smoke exhaust duct 18 having one end extending through the wall surface 15 of the house and facing the outdoors and having an exhaust outlet 17 in which an exhaust air blower @ 16 is arranged. A transmission type photoelectric sensor is disposed inside the smoke exhaust hood 14 as a smoke amount detection means 19 in order to detect a tempura fire in advance. The transmitter 19a and receiver 19b of the transmission type photoelectric sensor face each other with an interval (see Fig. 15), and the smoke exhaust hood 1 is placed between them.
It is arranged so that the oil smoke flowing inside 4 can pass through. In addition, the comparison circuit 20, 20' converts the electric signal from the photoreceiver 19b into
, memory circuit 21, frequency analysis circuit 21', arithmetic circuit 22
．． 22', the signal is guided to an analysis means 24 (see FIG. 18) comprising a logic circuit 23, and the smoke concentration, the range of change in concentration over a certain period of time δ, and the frequency component of the change in concentration are computationally analyzed.

On the other hand, a circuit breaker 26 for cutting off the fuel is provided in the fuel supply pipe 25 that supplies fuel to the cooking device 11, and depending on the analysis result of the analysis means 24, the circuit breaker 26 and the discharge air blower 1a1 are installed.
6 or an alarm 27 is provided. Note that a grease filter 29 is arranged near the suction port 13 to separate oil from the inhaled oil smoke.

Solid arrows indicate the flow of air by the exhaust blower 16.

Further, FIG. 15 is a sectional view showing the details of the surrounding area where the smoke amount detection means 19 is provided, FIG. 16 is a bronch diagram of the control system, FIG. 17 is a flowchart of the control system, and FIG. FIGS. 19 and 20 are logic circuit diagrams showing an example of the logic circuit diagram, and FIGS. 19 and 20 show the characteristics of the output signal from the detection means 19, and FIG. 21 shows the frequency characteristics of the output signal from the detection means 19.

Next, the operation of detecting a tempura fire by the transmission type photoelectric sensor 19 in the above configuration will be explained. Figure 14 and 1
As shown in FIG.
0 is placed and heated, and at the same time as cooking begins, the exhaust blower 1 is turned on.
6, oil smoke is sucked in from the suction port 13 and a collection operation is started. On the other hand, a large amount of oil smoke generated by overheating the oil in the deep fryer 30 is sucked into the smoke hood 14, blocks the light from the projector 19a, and blocks the light from the receiver 19b.
Significantly reduces the amount of light flowing into the The smoke amount detection means 19 detects this significant decrease in the amount of received light as a situation immediately before a tempura fire occurs. That is, in the electrical signal obtained by the smoke amount detection means 19, a phenomenon peculiar to a tempura fire occurs. Below, this phenomenon will be shown in comparison with grilled fish, which produces the most amount of smoke when cooking oil is heated, and with other cooking methods.
As shown in FIG. 0, the variation widths δ1 and δ2 of the smoke concentration in the fixed time δ1 are significantly different between the two. Here, in FIGS. 19 and 20, the vertical axis is the electrical signal from the smoke amount detection means 19, that is, the voltage proportional to the smoke concentration, and the horizontal axis is the time t. When heated, FIG. 20 shows the case of grilled fish. Second, as shown in Figure 21, in the frequency range below 200Hz,
In the case of grilled fish, the smoke density decreases at a constant rate as the frequency increases, but in the case of cooking oil, it has a characteristic that it has an inflection point a in the middle. Here, the vertical axis shows the voltage proportional to the smoke concentration, and the horizontal axis shows the characteristics with frequency. The solid line shows the case when cooking oil is heated, and the broken line shows the case when grilled fish.

Next, the flow of the control system will be explained using the flowchart shown in FIG. 17 and the logic circuit shown in FIG. 18.

Sl
step), supplying fuel to the cooking utensil 11; Then, the output signal ■ from the light receiver 19b is added to the comparison circuit 20,
Compare with the roughly set standard voltage V0 (S2
Step, Pu). On the other hand, the output voltage ■1 is stored in the memory circuit 21, and the arithmetic circuit 22 calculates the change width δ of the output voltage ■3 for a certain period of time δ1.

is calculated and added to the comparator circuit 20', and a preset variation width δ is added. (δ. δ2) (S3 step).

Furthermore, the frequency characteristics of the output voltage (2) are determined by the frequency analysis circuit 21, and the state in which the voltage proportional to the smoke concentration decreases as the frequency increases is calculated by the calculation circuit 22 to calculate the existence of an inflection point a (step S4). ).

and ■ in the logic circuits 23 and 23'. 〈■tsu, δ.

〉If δ1 and the inflection point a exists, the circuit breaker 26 is closed (S5 step) and the alarm 27 is activated (S6 step), that is, the smoke exhaust hood 14
By analyzing the amount of oil smoke sucked into the interior of the food and its changes, it is possible to distinguish tempura fires from other types of cooking.

Effects of the Invention As described above, the smoke evacuation device of the present invention detects the concentration of oily smoke sucked into the smoke evacuation hood and the range of changes in the concentration, thereby distinguishing between advance information leading to a tempura fire and other cooking, and is effective as a safety device. This system is capable of accurately detecting tempura fires in advance.

In addition, by detecting the concentration of oil smoke sucked into the smoke exhaust hood and the frequency component of the change in concentration, the system can more accurately distinguish between prior information leading to a tempura fire and other cooking, and activate a safety device.

Furthermore, by detecting the concentration of oily smoke sucked into the smoke hood, the range of changes in concentration, and its frequency components, it is possible to accurately distinguish between prior information leading to a tempura fire and other cooking, and activate safety devices. It is something.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a smoke evacuation device showing a first embodiment of the present invention, Fig. 2 is a sectional view of the main parts of the device, Fig. 3 is a block diagram of the control system of the device, and Fig. 4 is a sectional view of a smoke evacuation device showing a first embodiment of the present invention. Flowchart of the control system of the device; FIG. 5 is a logic circuit diagram showing an example of the analysis means of the device; FIGS. 6 and 7 are concentration characteristic diagrams of the output signal from the smoke amount detection means of the device; The figure is a sectional view of a smoke evacuation device showing a second embodiment of the present invention, FIG. 9 is a sectional view of essential parts of the same device, FIG. 10 is a block diagram of the control system of the same device, and FIG. 11 is a block diagram of the same device. Fig. 12 is a logic circuit diagram showing an example of the analysis means of the device, Fig. 13 is a frequency characteristic diagram of the output signal from the smoke amount detection means of the device, Fig. 1
FIG. 4 is a sectional view of a smoke evacuation device showing a third embodiment of the present invention;
Fig. 15 is a sectional view of the main parts of the device, Fig. 16 is a block diagram of the control system of the device, Fig. 17 is a flowchart of the control system of the device, and Fig. 18 is an example of the analysis means of the device. Logic circuit diagram, Figures 19 and 20 are characteristic diagrams of the output signal from the device's smoke amount detection means, Figure 21 is a frequency characteristic diagram of the output signal, and Figure 22 is a cross-sectional view of a conventional smoke evacuation device. ,
FIG. 23 is a block diagram of the control system of the device. 14... Smoke exhaust hood, 19... Smoke amount detection means, 24... Analysis means, 28...
control section. Name of agent: Patent attorney Akira Okaji and 2 others28
劃 1 Insult Crane 1 Figure 21'=) $ 3 Figure [4 Figure 5, 20 Figure 6 Figure 7 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 [S0100 First q ;f ze (lh) 15th 161J Figure 17 Figure 18 Figure 22' 3119 Figure 20 Figure 21 θ lθ020θ /fl M 11 (Hz) 122 Th
S Fig. 23 /'/ ＼＝]7

Claims (3)

[Claims] (1) A smoke amount detection means is provided in the smoke exhaust hood that discharges smoke, and an analysis means is provided to analyze the smoke concentration and the range of change in smoke concentration within a certain period of time from the output signal of the smoke amount detection means. smoke evacuation equipment. (2) Smoke volume detection means is provided in the smoke exhaust hood that discharges smoke, and analysis means is provided for analyzing the smoke concentration and frequency components of changes in smoke concentration from the output signal of the smoke volume detection means. Device. (3) A smoke amount detection means is provided in the smoke exhaust hood that discharges smoke, and from the output signal of the smoke amount detection means, the smoke concentration, the width of change in smoke concentration within a certain period of time, and the frequency component of the change in smoke concentration are determined. A smoke evacuation device equipped with an analytical means to analyze