JPH04155132A - Smoke discharging device - Google Patents

Abstract

PURPOSE:To sense a tempura fire through clear separation of the tempura fire from other cooking and to previously accurately detect the occurrence of the tempura fire by providing a smoke discharge hood through which smoke is discharged and a smoke amount detecting means and a gas component detecting means located in the smoke discharge hood. CONSTITUTION:Oil in a tempura pan 28 is overheated, quantities of soot is sucked in a smoke discharge hood 14, light from a projector 19a of a transmission type photoelectric sensor composing a smoke amount detecting means 19 is shaded, and a quantity of light flowing in a light receiver 19b is sharply decreased. Sharp reduction of a quantity of received light is detected as a first state before a tempura fire occurs. Meanwhile, a gas component contained in smoke generated during cooking is differed with a kind of cooking. Especially, when edible oil is overheated, quantities of acetaldehyde is generated and can be distinguished from other cooking. Thus, by distinguishing a gas component in smoke by means of a gas component detecting means 20, a situation is detected as a second state before a tempura fire occurs, and through discrimination of the situation in association with smoke quantity information, a tempura fire can be previously detected with high precision.

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 specifically, a smoke evacuation device equipped with a detection sensor for preventing tempura fires. It is related to.

2. Description of the Related Art Conventionally, as shown in FIG. 10, 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 air 14. On the other hand, the cooking device 1 is placed directly inside the hood 3 as a means of detecting a tempura fire! In addition to arranging an infrared temperature sensor 5,
A configuration in which an alarm device 6 is disposed outside the hood 3 is included.

Furthermore, a removable grease filter 7 is provided near the suction port 2 of the hood 3 in order to separate oil contained in the oil smoke. 8 is a controller for the temperature sensor 5 and the alarm 6. Note that the solid arrow in FIG. 10 indicates the exhaust air t11.
FIG. 11 shows a block diagram of the control system.

When the exhaust air 614 is driven with the above configuration, a flow of air is generated from the intake port 2 to the exhaust air 614, and oil smoke and the like generated along with the air flow sucked from the intake port 2 are sucked into the 7-door 3. . On the other hand, the temperature of the cooking device 1 is constantly monitored by an infrared temperature sensor 5, and in the event of an abnormality, an alarm 6 is activated via the controller 8 to notify of the abnormality. Further, the oil and fat in the oil smoke adheres to a grease filter provided at the inlet 2 and is separated, and then the purified air is discharged outdoors.

Problems to be Solved by the Invention However, with the above-described configuration, for example, flame phenomena during grilled fish or Chinese food cooking are also detected in the same way, so it cannot be accurately distinguished from tempura fires, resulting in malfunctions.

The present invention solves these conventional problems, and aims to provide a smoke evacuation device that clearly separates and senses tempura fires from other cooking and accurately detects tempura fires in advance. This is the purpose.

Means for Solving the Problems In order to solve the above problems, the smoke exhaust device of the present invention includes a smoke exhaust hood that discharges smoke, a smoke amount detection means and a gas component detection means provided in the smoke exhaust hood. It is equipped with the following.

Further, the smoke evacuation device of the present invention includes a smoke evacuation hood for discharging smoke, a smoke amount detection means and a gas component detection means provided in the smoke evacuation hood, and a smoke concentration based on a signal from the smoke amount detection means. It is an advanced version of the analytical means for analyzing the changes in concentration.

According to the above-mentioned structure, the present invention detects a change in the concentration of oil smoke sucked into the smoke exhaust hood, and also detects the gas component of the amount of smoke by the gas component detection means, thereby obtaining advance information leading to a tempura fire and implementing a safety device. It is something that makes it work.

Furthermore, by analyzing changes in the concentration of smoke from the smoke amount detection means, advance information leading to a tempura fire can be obtained with higher accuracy.

Example An embodiment of the present invention will be described below based on the drawings.

Figures 1 to 3 are cross-sectional views of a smoke evacuation device in which a transmission type photoelectric sensor is used as a smoke amount detection means as a first embodiment of the present invention, and details of the surrounding area where the transmission type photoelectric sensor is arranged. These are a sectional view of the main parts shown and a program diagram of the control system.

In FIGS. 1 to 3, one end is connected to the heating part 1 of the cooking device 11.
Smoke exhaust hood 1 having an inlet port 13 facing toward 2
4 is provided, which is connected to the smoke exhaust hood 14, and whose other end passes through the wall surface 15 of the house to face the outdoors, and an exhaust air blower I! A smoke exhaust duct 18 is provided which has an outlet 17 arranged with 116 . Inside the smoke exhaust hood 14, a transmission type photoelectric sensor is arranged as a smoke amount detection means for detecting a tempura fire in advance, and
For example, gas component detection means 2o using a semiconductor gas sensor is arranged. The light projector 19a and the light receiver 19b, which constitute the transmission type photoelectric sensor, face each other with a gap between them, so that the oil smoke flowing in the smoke exhaust hood 14 passes between them, and the gas component detection means 20 is also in contact with the oil smoke atmosphere. It is located. On the other hand, a circuit breaker 2 that cuts off fuel to a fuel supply pipe 21 that supplies fuel to the cooking device 1)
2, and a controller 24 that controls the operation of the circuit breaker 22, the exhaust blower 16, or the alarm 23 based on signals from the smoke amount detection means 19 and the gas component detection means 20. Reference numeral 25 is a grease filter that separates oil from inhaled oil smoke, and solid arrows indicate air flow caused by the exhaust blower 16.

Next, the operation of detecting a tempura fire in the above configuration will be explained. As shown in FIGS. 1 and 2, the cooking device 11
Place the tempura pot 26 on the heating section 12! By operating the exhaust blower 16 at the same time as heating and starting cooking, the intake port 1
From 3 onwards, oil smoke is sucked in and the collection operation begins. On the other hand, when the oil in the deep fryer 26 reaches an overheating state and a very large amount of oil smoke is generated, this large amount of oil smoke is sucked into the smoke exhaust hood 14, but at the same time, this large amount of oil smoke causes a problem. In FIG. 3, the light from the light projector 19a of the transmission type photoelectric sensor constituting the smoke amount detection means 19 is blocked, and the amount of light flowing into the light receiver 19b is significantly reduced. This significant decrease in the amount of light received is the first step in advance of a tempura fire.
Detected as a situation.

On the other hand, the gas components contained in the smoke generated during cooking vary depending on the type of cooking, and especially when cooking oil is overheated, a large amount of acetaldehyde is generated, which can be clearly distinguished from other types of cooking. It is something. Therefore, by distinguishing the gas components of the smoke amount using the gas component detection means 20, it can be detected as a second situation before a tempura fire occurs, and by determining this together with the above smoke amount information, a tempura fire can be accurately detected in advance. Can be detected.

Figures 4 to 6 are cross-sectional views of a smoke evacuation device in which a transmission type photoelectric sensor is used as a smoke amount detection means as a second embodiment of the present invention, and details of the surrounding area where the transmission type photoelectric sensor is arranged. 2 is a cross-sectional view of the main parts shown and a block diagram of its control system.

4 to 6, one end is connected to the heating part 1 of the cooking device 11.
Smoke exhaust hood 1 having an inlet port 13 facing toward 2
A smoke exhaust duct 18 is provided, which is connected to the smoke exhaust hood 14, has the other end facing the outdoors through the wall surface 15 of the house, and has an exhaust outlet 17 in which an exhaust blower 16 is disposed. ing. Inside the smoke exhaust hood 14, a transmission type photoelectric sensor for detecting a tempura fire in advance is arranged as a smoke amount detection means 19, and a gas component detection means 2 using, for example, a semiconductor gas sensor.
0 is placed! has been done. The light projector 19a and the light receiver 19b, which constitute the transmission type photoelectric sensor, face each other with a gap between them, so that the oil smoke flowing in the smoke exhaust hood 14 passes between them, and the gas component detection means 20 is also in contact with the oil smoke atmosphere. It is located. Further, the electrical signal from the light receiver 19b is guided to the analysis means 27, where the concentration of smoke and the fluctuation state of the concentration are analyzed. On the other hand, a circuit breaker 22 is provided in the fuel supply pipe 21 that supplies fuel to the cooking device 11, and a circuit breaker 22 is provided to cut off the fuel. The circuit breaker 22, discharge air @ie, or alarm 2 is activated by the signal of
A controller 24 is provided to control the operation of 3. 25
is a grease filter that separates oil from inhaled oil smoke, and solid arrows indicate the air flow caused by the exhaust blower 16.

Next, the operation of detecting a tempura fire in the above configuration will be explained. As shown in FIGS. 4 and 5, the cooking device 11
Tempura @26 is placed on the heating section 12 of
From step 3, the oil smoke is sucked in and the collection operation begins. On the other hand, when the oil in the deep fryer 26 reaches an overheating state and a very large amount of oil smoke is generated, this large amount of oil smoke is sucked into the smoke exhaust hood 14, but at the same time, this large amount of oil smoke becomes an obstacle. This blocks the light from the light emitter 19a of the transmission type photoelectric sensor constituting the smoke amount detection means 19 in FIG. 6, and significantly reduces the amount of light flowing into the light receiver 19b. This significant decrease in the amount of received light is detected as the first situation before a tempura fire occurs.

On the other hand, the gas components contained in the amount of smoke generated during cooking differ depending on the type of cooking, and in particular, when cooking oil is overheated, a large amount of acetaldehyde is generated, making it clearly distinguishable from other types of cooking. Therefore, the gas component detection means 20
By distinguishing the gas components of the smoke amount, it is detected as a second condition before a tempura fire occurs.

A phenomenon peculiar to a tempura fire occurs in the electric signal obtained by the smoke amount detection means 19 described above. Below, we will compare this phenomenon between the case of heating cooking oil and the case of grilled fish, which produces the most amount of smoke in other cooking methods. As shown in FIG. 9, the fluctuation widths δ1 and δ2 of the smoke density are significantly different between the two, and the second reason is that their frequency characteristics are different as shown in FIG. Here, FIG. 8 shows a characteristic diagram in which the vertical axis is the electric signal from the smoke amount detection means 19, that is, the concentration of smoke, and the horizontal axis is time. FIG. 8(a) shows the characteristics when heating cooking oil.
Fig. 8 fb) is the case with grilled fish, and in the case of grilled fish, the level fluctuation range of smoke concentration is larger than in the case of cooking oil. In addition, Figure 9 shows a characteristic diagram in which the vertical axis represents the smoke concentration and the horizontal axis represents the frequency of change in smoke concentration.The solid line represents the case when cooking oil is heated, the broken line represents the case when grilled fish; , the smoke change frequency is 100 to 200 Hz, and the smoke density is lower than that of grilled fish.

Therefore, as shown in the flowchart of the control system in FIG.
The circuit breaker 22 provided in the fuel tank is forcibly operated to cut off the fuel supply and also activate the alarm 23. That is, a tempura fire is detected in advance based on the concentration of oily smoke sucked into the smoke exhaust hood 14, its fluctuation content, and gas components. In addition, the oil and fat components sucked into the inside of the smoke exhaust hood 14 adhere to the grease filter 25 provided inside the suction port 13 and are removed, so the amount of oil and fat inside the suction port 13 is significantly reduced. I am going to do it.

Effects of the Invention As described above, according to the present invention, the concentration of oily smoke and gas components in the smoke exhaust hood are detected and used as advance information leading to a fire to distinguish it from other types of cooking. It is possible to prevent tempura from burning by operating the device accurately.

Furthermore, by analyzing changes in the concentration of oil smoke sucked into the smoke exhaust hood, the system uses advance information leading to a tempura fire and distinguishes it from other types of cooking. It is possible to accurately prevent fires before they occur.

[Brief explanation of the drawing]

■ Figure 1 is a sectional view of a smoke evacuation device showing the first embodiment of the present invention, Figure 2 is a sectional view of the main parts of the same device, Figure 3L is a block diagram of the control system of the same device, and Figure 3L is a block diagram of the control system of the same device. 4
≦ The figure is a cross-sectional view of a smoke evacuation device showing a second embodiment of the present invention, FIG. 5 is a sectional view of the main part of the same device, and FIG. The figure is a flowchart of the control system of the device, Figures 8 and 9 are characteristic diagrams of signals contained in smoke, Figure 10 is a cross-sectional view of a conventional smoke evacuation device, and Figure 11 is a diagram of the same device. Control: This is a block diagram of the control system. 14... Smoke exhaust hood, 18... Smoke exhaust duct, 19.
...Smoke amount detection means, 20...Scatter component detection means, 22...Blocker, 24...Controller, 27...Analysis means. Agent Yoshihiro Morimoto Figure 7 and a-, 4-way 7-de 24 Surplus #L Figure 2 tf-Tsurumi 11t, R3 Figure 3 4fjgJ 27---Zen phase 5 friends Figure S Figure 7? Figure 1 Sagi No ＼ N school

Claims (1)

[Scope of Claims] 1. A smoke exhaust device comprising a smoke exhaust hood for discharging smoke, and a smoke amount detection means and a gas component detection means provided in the smoke exhaust hood. 2. A smoke exhaust hood that discharges smoke, a smoke amount detection means and a gas component detection means provided in the smoke exhaust hood, and analysis of the smoke concentration and the fluctuation state of the concentration from the signal of the smoke amount detection means. A smoke evacuation device equipped with analysis means.