JPH0486438A - 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 Field of Industrial Application 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 something.

2. Description of the Related Art As shown in FIG. 7, a conventional smoke evacuation device of this type includes a hood 3 having an inlet port 2 facing above a cooking appliance 1.
is arranged so that the oil smoke trapped in the hood 3 is discharged outdoors by an exhaust fan 4. On the other hand, an infrared temperature sensor 5 is disposed inside the hood 3 at a position directly facing the cooking device 1 as a means for detecting a tempura fire, and an alarm 6 is disposed outside the hood 3. There is. 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. Further, 8 is a controller for the temperature sensor 5 and the alarm 6. Note that solid arrows in FIG. 1 indicate the air flow caused by the exhaust fan 4, and FIG. 8 shows a block diagram of the control system.

When the exhaust fan 4 is driven with the above configuration, the exhaust fan 4 is
An air flow 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 inlet 2, is separated, and is then discharged outdoors by purified air.

Problem to be Solved by the Invention However, in the above configuration, since the temperature sensor 5 is placed directly facing the cooking appliance, the temperature sensor 5
Since oil and fat etc. adhere to the detection surface of the sensor and become contaminated, the detection sensitivity of the temperature sensor 5 will change if this continues, making accurate temperature monitoring impossible. Therefore, the surface of the temperature sensor 50 must be cleaned every time it becomes dirty. There was an issue of not being able to do so.

The present invention solves these conventional problems and aims to maintain the sensing accuracy of temperature sensors and the like provided for the prevention of tempura fires over a long period of time.

Means for Solving the Problems In order to solve the above problems, the smoke evacuation device of the present invention includes a smoke evacuation hood for discharging smoke, a passage for smoke guided by the smoke evacuation hood, and a smoke evacuation device provided in at least one of the vicinity of the passage. This device includes a cylinder through which air passes, and a smoke detection means provided in the cylinder to detect smoke.

Operation The present invention uses the above-described configuration to detect changes in the concentration of oil smoke sucked into the smoke exhaust hood. Furthermore, while the smoke evacuation device is in operation, air passes through the inside of the cylindrical body in which the smoke detection means is provided.

EXAMPLE Hereinafter, as an example of the present invention, a case where a transmission type photoelectric sensor is used as smoke detection means will be explained based on FIGS. 1 to 3. In the figure, one end is the heating part 1 of the cooker 11.
Smoke exhaust hood 1 with a speaking volume of 13 opened facing 2
4, and the other end is a smoke exhaust duct 8 which extends through the wall surface 15 of the house and faces the outdoors, and has an exhaust port 17 in which an exhaust air blower fi 16 is arranged. and the smoke exhaust hood 14
A transmission type photoelectric sensor is disposed inside the smoke detection means 19 to detect a tempura fire in advance. The light projector 19a and the light receiver 19b of the transmission type photoelectric sensor face each other with a space between them, and are arranged so that the oil smoke flowing inside the smoke exhaust hood 14 passes between them. The emitter 19a and the light receiver 19b are provided so as to protrude inside the smoke exhaust hood 14, with one end serving as a clean air inlet 20 facing the outside of the smoke exhaust hood 14, and the other end serving as a clean air outlet 21. They are each installed in the vicinity of the clean air intake port 20 of a hollow protection tube 22 which is a cylindrical body. on the other hand,
A circuit breaker 24 for cutting off fuel is provided in the fuel supply pipe 23 that supplies fuel to the cooking device 11, and the circuit breaker 24, exhaust blower 16, or alarm 25 is activated by a signal from the transmission type photoelectric sensor 19. A controller 26 is provided.

Note that 27 is a grease filter that separates oil from inhaled oil smoke, solid line arrows indicate the air flow caused by the exhaust blower 16, and dashed line arrows indicate the flow of clean air. Fig. 3 shows the control system block. The diagram, FIG. 2, is a cross-sectional view showing the details of the surroundings in which the transmission type advance sensor 19 is provided.

Next, the contamination prevention operation and the tempura fire detection operation of the transmission type advance sensor 19 in the above configuration will be explained.

As shown in FIGS. 1 and 2, the deep fryer 28 is placed on the heating section 12 of the cooking device 11 and heated, and at the same time as cooking begins, the exhaust air is blown! Driving 16.

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 air flows from the outside to the inside of the smoke exhaust two F14.

Therefore, a flow is generated from the clean air suction port 20 of the protective tube 22, which is provided with one end protruding inside the smoke exhaust hood 14, toward the clean air discharge port 21. For this reason, oil smoke sucked into the inside of the smoke exhaust hood 14 is always prevented from flowing into the protection tube 22, so that the transmission type photoelectric sensor 1
9 contamination is prevented. On the other hand, if the oil in the deep fryer 28 reaches a heated state and a much larger amount of oil smoke is generated than, for example, when cooking grilled fish, this large amount of oil smoke will be sucked into the smoke exhaust hood 14. However, at the same time, this large amount of oil smoke becomes an obstacle and blocks the light from the light emitter 19a of the transmission type photoelectric sensor, greatly reducing the amount of light flowing into the light receiver 19b. The transmission type photoelectric sensor 19 detects this significant decrease in the amount of received light as a situation immediately before a tempura fire occurs, and if this output exceeds a certain limit, the controller 26 sets a cutoff in the fuel supply pipe 23. vessel 24
The alarm 25 is forcibly operated to cut off the fuel supply and 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. In addition, since the oil and fat components sucked into the inside of the smoke exhaust hood 14 adhere to the grease filter 27 provided inside the suction port 13 and are removed, the amount of oil and fat inside the suction port 13 is significantly reduced. It is what it is.

Figures 4 to 6 show other embodiments, and the difference from the previous embodiment is that clean air is forcibly supplied to the protective tube 22 using an auxiliary blower 28. . In the two embodiments described above, the protective tube 22 is provided to protrude inside the smoke exhaust hood 14, but it may be provided outside the smoke exhaust hood 14. In addition, in FIGS. 4 and 5, parts indicated by the same numbers as in FIGS. 1 and 2 indicate the same parts, and FIG. 5 is a cross-sectional view showing details of the surroundings of the detection sensor 19, and FIG. A control block diagram is shown.

Effects of the Invention As described above, the smoke evacuation device of the present invention allows air to pass through the iIMB of smoke guided by the smoke exhaust hood and the inside of the cylindrical body provided in the vicinity of this passage. This prevents oil and fat from adhering to the detection means. Therefore, it is possible to prevent a decrease in detection sensitivity due to contamination of the smoke detection means.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a smoke evacuation device showing one embodiment of the present invention, Fig. 2 is a sectional view of the main parts of the same device, Fig. 3 is a block diagram of the control system of the same device, and Fig. 4 is a FIG. 5 is a sectional view of the main parts of the device, FIG. 6 is a block diagram of the control system of the device, and FIG. 7 is a sectional view of a conventional smoke evacuation device. Figure 8 is a block diagram of the control system of the device. 14... Smoke exhaust hood, 19... Transmissive photoelectric sensor 20... Clean air intake port, 21...
...Clean air discharge port, 22...Protection tube. Name of agent Patent attorney Shigetaka Awano Haka1 person I# pull food familiarity ℃ / Sa - Agency Hikari yt, H 15 dispute 9 Ki o FJ entry 0 r-5 Shizukudo Ri Tomoe, 0 soil Rossi 0 憚謹Figure 2 Figure 2 Figure 弗Figure A

Claims (1)

[Claims] A smoke exhaust hood that discharges smoke, a smoke passage guided by the smoke exhaust hood, a cylinder provided in at least one of the vicinity of the passage and through which air passes, and a cylinder provided in the cylinder to detect the smoke. A smoke evacuation device equipped with a smoke detection means.