JPH04155131A - smoke evacuation device - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention is a smoke exhaust system for removing oil smoke generated during cooking! More specifically, the present invention relates to a smoke evacuation device equipped with a detection sensor for preventing tempura fires.

BACKGROUND OF THE INVENTION Conventionally, this type of smoke evacuation device has a hood 3 having an inlet 2 facing above a cooking appliance 1 and opening as shown in FIG.
Arranged! A configuration is adopted in which the oil smoke trapped in the hood 3 is discharged outdoors by an exhaust air 814. On the other hand, an infrared temperature sensor 5 is placed inside the hood 3 at a position directly facing the cooking device 1 as a means of detecting a tempura fire.
Alarm device 6 is placed outside the hood 3! A configuration has been adopted to do so.

Furthermore, a removable grease filter 7 is provided near the suction port 2 of the hood 3 in order to separate the oil contained in the oil smoke. 8 is a controller for the temperature sensor 5 and the alarm 6. Note that solid arrows in FIG. 7 indicate air flows caused by the exhaust air 114, and FIG. 8 shows a block diagram of the control system.

Exhaust air with the above configuration! When 14 is driven, air flows from the suction port 2 to the exhaust fan 4, 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 the controller 8 to notify you of any abnormality. :
In addition, 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, in the above configuration, the temperature sensor 5 is placed directly in front of the cooking device! As a result, the detection surface of the temperature sensor 5 gets contaminated with oil and fat, which changes the detection sensitivity of the temperature sensor 5 and makes accurate temperature monitoring impossible. Another problem was that the surfaces had to be cleaned.

The present invention solves such conventional problems, and aims to provide a smoke evacuation device that can maintain the sensing accuracy of the detection means provided in the slit for preventing fires in tempura over a long period of time. It is.

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 exhausts smoke, a smoke passage guided by the smoke exhaust hood, and at least one of the areas near the passage. A cylindrical body is provided in the cylindrical body through which external clean air passes, and a detection means is provided in the cylindrical body to detect smoke, and the exhaust flow from the cylindrical body is passed through a smoke exhaust hood. It is configured to discharge in a direction almost parallel to the flow of oil smoke.

The smoke evacuation device of the present invention also includes a smoke evacuation hood for discharging smoke, a smoke passage guided by the smoke evacuation hood, an abnormality detection means provided in this passage for detecting a fire in advance, and an abnormality detecting means for detecting a fire in advance. The detection means is equipped with an oil removing means for removing oil and fat adhering to the detection means.

Effect: With the above configuration, the present invention can detect changes in the concentration of oil smoke sucked into the smoke exhaust hood and accurately monitor the temperature.
During operation of the smoke evacuation device, clean external air passes through the inside of the cylindrical body provided with the smoke detection means, thereby making it possible to clean the smoke detection means.

Further, it forcibly eliminates contamination of the abnormality detection means due to oil smoke sucked into the inside of the smoke exhaust duct.

Example Hereinafter, one embodiment of the present invention will be described 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 detection means as an embodiment of the present invention, and main parts showing details of the surrounding area where the transmission type photoelectric sensor is arranged. 2 is a cross-sectional view and a block diagram of its control system.

In FIGS. 1 to 3, one end is connected to the heating part 1 of the cooking device 11.
A smoke exhaust hood 14 is provided which has an inlet/port 13 that opens and faces the smoke exhaust hood 14. The smoke exhaust hood 14 is connected to the smoke exhaust hood 14, and the other end passes through the wall 15 of the house to face the outdoors and is used to blow exhaust air. Arrange l116! A smoke exhaust duct 18 is provided, which has a discharge outlet 17 with a closed opening. Inside the smoke exhaust hood 14, a transmission type photoelectric sensor is arranged as a smoke detection means 19 to detect a tempura fire in advance! A light emitter 19a and a light receiver 19b constitute this transmission type photoelectric sensor.
are arranged so that the oil smoke flowing inside the smoke exhaust hood 14 passes through them. has been done. The projector 19a and the receiver 19b have one end connected to the smoke exhaust hood 1.
The clean air inlet 20 facing the outside of the smoke exhaust hood 14 opens into the smoke exhaust hood 14, and the other end protrudes inside the smoke exhaust hood 14 so that it opens within the smoke exhaust hood 14 as a clean air outlet 21. They are installed near the clean air inlet 20 in the hollow protection space 22, which is a cylindrical body, and near the bottom surface of the protection space 22, respectively. Further protection 1
! The clean air outlet 21 of the j22 is bent downward within a range where light passing through the inside is not blocked, and is configured to discharge clean air from the outside in a direction almost parallel to the air flow flowing inside the smoke exhaust hood 14. There is.

On the other hand, a circuit breaker 24 for cutting off fuel is provided in a fuel supply pipe 23 that supplies fuel to the cooking device 11, and a signal from the smoke detection means 19 activates the circuit breaker 24, exhaust blower 16, or alarm 825. A controller 26 is provided to control the operation. Reference numeral 27 denotes a grease filter that separates oil from inhaled oil smoke, solid arrows indicate the flow of air caused by the exhaust blower 16, and dashed arrows indicate the flow of clean air.

Next, the contamination prevention operation and the tempura fire detection operation of the smoke detection means 19 in the above configuration will be explained. As shown in FIGS. 1 and 2, the tempura @ 28 is placed on the heating section 12 of the cooking device 11 and heated, and at the same time as cooking begins, the discharge air blower @ 16 is operated. Then, oil smoke is sucked in from the suction port 13 and a collection operation is started. In this state, the pressure inside the smoke exhaust hood 14 is lower than the pressure outside the smoke exhaust hood 14, so a flow from the outside to the inside of the smoke exhaust hood 14 occurs.

Therefore, from the clean air suction port 20 of the protective space 22 provided protruding inside the smoke exhaust hood 14 to the clean air discharge port 2.
A flow toward 1 occurs. For this reason, the smoke exhaust hood 1
Since oil smoke and the like sucked into the inside of the smoke detector 4 are always prevented from flowing into the protective gap 22, the transmission type photoelectric sensor, which is the smoke detection means 19, is prevented from being contaminated. Further protection between 22
Since the clean air outlet 21 is formed by bending the tip downward, the smoke concentration can be detected with high accuracy without disturbing the flow inside the smoke exhaust hood 14 caused by the discharge flow.

On the other hand, if the oil in the deep fryer 28 reaches an overheating state and a very large amount of oil smoke is generated compared to the oil smoke generated when cooking grilled fish, for example, this large amount of oil smoke will be sent to the smoke exhaust hood 14.
However, at the same time, this large amount of oil smoke becomes an obstacle, blocking the light from the projector 19a in FIG. 3, and the amount of light flowing into the light receiver 19b is significantly reduced. That is, the smoke detection means 19 detects this significant decrease in the amount of light received as a situation immediately before a tempura fire occurs, and the light receiver 1
When the output of 9b exceeds a certain limit, the controller 26 forcibly operates the circuit breaker 24 provided in the fuel supply pipe 23 to cut off the fuel supply and activate the alarm 25. be. That is, a tempura fire is detected in advance based on the amount of oily smoke sucked into the smoke exhaust hood 14.

Figures 4 to 6 show a smoke exhaust system in which a transmission type photoelectric sensor is used as the abnormality detection means, as in the second embodiment of the present invention! A cross-sectional view and a transmission-type photoelectric sensor arranged! 2 is a sectional view of main parts showing details of the surrounding area and a block diagram of the 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
4, which is connected to the smoke exhaust hood 14, and whose other end passes through the wall 15 of the house to face the outdoors, and is equipped with an exhaust blower 16! A smoke exhaust duct 18 is provided, which has a discharge outlet 17 with a closed opening. Inside the smoke exhaust hood 14, a transmission type photoelectric sensor for detecting a tempura fire in advance is arranged as an abnormality detection means 29, and a light emitter 29a and a light receiver 29b making up this transmission type photoelectric sensor.
are arranged so that the oil smoke flowing inside the smoke exhaust hood 14 passes through them. has been done. On the outside of the light transmitting surfaces of the projector 29a and the light receiver 29b, oil and fat removing means 31 made of a transparent material such as glass in which a heating wire 30 is enclosed is arranged so as to cover the transmitting surfaces. On the other hand, a circuit breaker 24 for cutting off fuel is provided in a fuel supply pipe 23 that supplies fuel to the cooking device 11, and a signal from an abnormality detecting means 29 is used to connect the circuit breaker 24, exhaust air blower 116, or alarm 25. A controller 26 is provided to control the operation of. 27 is a grease filter that separates oil from inhaled oil smoke, and solid arrows indicate the flow of oil smoke caused by the discharge air 116.

Next, the contamination prevention operation and the tempura fire detection operation of the abnormality detection means 29 in the above configuration will be explained. As shown in FIGS. 4 and 5, the deep fryer 28 is placed on the heating section 12 of the cooking device 11, heated, and at the same time as cooking begins, the exhaust air blower 5116 is operated, and the oil smoke is sucked in from the inlet 13. Start collection operation. - On the other hand, at the same time, the hot wire 30 of the oil removing means 31 is appropriately energized and heated to sublimate the adhered oil and fat to prevent surface contamination.

On the other hand, if the oil in the deep fryer 28 reaches an overheating state and a very large amount of oil smoke is generated compared to the oil smoke generated when cooking grilled fish, for example, this large amount of oil smoke will be sent to the smoke exhaust hood 14.
However, at the same time, this large amount of oil smoke becomes an obstacle, blocking the light from the light projector 29a in FIG. 6, and the amount of light flowing into the light receiver 29b is significantly reduced. If the abnormality detection means 28 detects this significant decrease in the amount of received light as a situation immediately before a tempura fire occurs, and the output of the light receiver 29b exceeds a certain limit, the controller 26
The circuit breaker 24 provided in the fuel tank 3 is forcibly operated to cut off the fuel supply and also operate the alarm 25. That is, a tempura fire is detected in advance based on the amount of oily smoke sucked into the smoke exhaust hood 14.

Effects of the Invention As described above, according to the present invention, external clean air passes through the inside of the cylindrical body equipped with smoke detection means, which is provided near the passage of smoke guided by the smoke exhaust hood, and this flow causes This prevents fats and oils from adhering to the smoke detection means without disturbing the flow of oil smoke inside the hood, thereby preventing a decrease in detection sensitivity.

In addition, it is equipped with an oil removal means that forcibly removes oil and other substances that adhere to the front surface of the abnormality detection means! By doing so, it is possible to prevent a decrease in detection sensitivity.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a smoke evacuation device showing a first embodiment of the present invention, and Fig. 2 is an interior! A sectional view of the main part, Figure 3 is the interior! FIG. 4 is a cross-sectional view of a smoke evacuation device showing an embodiment of the second invention of the present invention, and FIG. 5 is a block diagram of the control system of the present invention. 6 is a block diagram of the control system of the device, FIG. 7 is a sectional view of a conventional smoke evacuation device, and FIG. 8 is a sectional view showing the main parts of the device.
The figure is a block diagram of the control system of the device. 14... Smoke exhaust hood, 18... Smoke exhaust duct, 19.
...Smoke detection means, 20...Clean air intake port, 21...
・Clean air discharge port, 22... Between protection, 24... Circuit breaker, 26... Controller, 29... Abnormality detection means, 30
...Heat wire, 31... Grease removal means. Agent Yoshihiro Morimoto Figure 7 Figure 23 8 24 /1 Figure 2 Figure 3 Figure 4 Figure 27-, Wing deflection 1 to 31-8 Oil and fat ■ Spot Figure 5

Claims (1)

[Scope of Claims] 1. A smoke exhaust hood that discharges smoke, a smoke passage guided by the smoke exhaust hood, and a smoke exhaust hood provided in at least one of the vicinity of the passage, through which external clean air passes and the An exhaust gas exhaust system comprising: a cylindrical body that discharges a discharge flow into a passageway in a direction substantially parallel to a flow of oil smoke passing through the smoke exhaust hood; and a detection means provided in the cylindrical body for detecting smoke. smoke device. 2. A smoke exhaust hood that discharges smoke, a smoke passage guided by the smoke exhaust hood, an abnormality detection means provided in this passage to detect fire in advance, and oil and fat that adheres to the front surface of this abnormality detection means. A smoke evacuation device equipped with a means for removing oil and fat.