JP2538750B2 - Exhaust system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust device for use in kitchens, laboratories, factories, etc., for exhausting exhaust loads such as smoke, exhaust heat, gas mist, and odor generated inside.

[0002]

2. Description of the Related Art In a conventional exhaust system, an exhaust duct having an exhaust fan is connected to an exhaust hood to communicate with the outside air, and the exhaust is a laminar flow in the hood instead of a swirl flow. Since the exhaust volume is fixed, the exhaust characteristics could not be changed according to the exhaust load.

[0003]

Since the conventional exhaust system is constructed as described above, it has the following problems. (1) Since work can only be performed within a range that matches the fixed exhaust characteristics, the work content is restricted. (2) Even if the exhaust load is small, unnecessary exhaust is performed, so that the running cost is wasted. (3) If the generation speed of smoke, exhaust heat, gas mist, odor, etc. is high, the exhaust cannot be separated and diffuses indoors. (4) It has a low attraction effect, is easily affected by the surrounding environment, and smoke, exhaust heat, gas mist, odor, etc. easily diffuse into the room.

The present invention has been made in order to solve the above-mentioned problems. By detecting a change in exhaust load, generating a swirl flow in the exhaust hood in accordance with the change, and changing the exhaust characteristic following it. It is an object of the present invention to provide an exhaust device capable of reliably exhausting smoke, exhaust heat, gas mist, odor, etc. without diffusing it indoors.

[0005]

In order to solve the above-mentioned problems, an exhaust system according to the present invention connects an exhaust duct having an exhaust fan to an exhaust hood to communicate with the outside air, and to supply the exhaust hood to the exhaust hood. In an exhaust device having a nozzle for generating a swirl flow of outside air introduced through an air fan and an air supply duct, a hood opening adjustment device capable of adjusting an opening area of an outer peripheral edge portion of the exhaust hood. Provided in the exhaust duct, a smoke sensor for detecting the presence and amount of smoke, a gas sensor for identifying the type of gas, and a pressure sensor for detecting the pressure, provided in the exhaust hood, A pressure sensor for detecting the pressure in the hood, an exhaust fan rotation control means for controlling the rotation speed of the exhaust fan in accordance with a detection signal from the smoke sensor, and the gas sensor. Air supply fan rotation control means for controlling the rotation speed of the air supply fan according to the identification signal from the sensor, and the opening of the hood opening adjustment device is set according to the pressure difference detected by the pressure sensors. It is characterized by comprising a controller having a hood opening setting means.

Further, the controller stores the exhaust operation pattern set by the exhaust fan rotation control means, the air supply fan rotation control means, and the hood opening setting means into a mode, and accordingly, the exhaust fan rotation control means. , An air supply fan rotation control means, and an exhaust mode storage means for operating the hood opening degree setting means.

[0007]

Since the exhaust device according to the present invention is constructed as described above, the exhaust load such as smoke, exhaust heat, gas mist, odor, etc., generated during the indoor work is controlled by the smoke sensor, the gas sensor, and the exhaust load. The exhaust fan rotation control means, the air supply fan rotation control means, and the hood opening degree setting means are detected by the respective sensors of the pressure sensor, and the rotation speed of the exhaust fan, the rotation speed of the air supply fan, and By changing the opening of the hood opening adjustment device, the exhaust volume, the effect of attracting ambient air due to the swirling flow, and the collection efficiency due to the opening of the exhaust hood are changed, so the exhaust characteristics change to the exhaust load fluctuation. Follow and change.

Further, the exhaust mode storage means operates the exhaust fan rotation control means, the air supply fan rotation control means, and the hood opening degree setting means in accordance with the stored moded exhaust operation pattern.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the figure, reference numeral 1 denotes an exhaust hood, which is installed above an exhaust emission source such as smoke, exhaust heat, gas mist, and odor.
An exhaust duct 3 having an exhaust fan 2 is connected to the center of the exhaust hood 1 so as to communicate with the outside air, and an air supply fan 4 and an air supply duct 5 are provided in the peripheral portion of the exhaust hood 1 to surround the exhaust air. A nozzle 6 for generating a swirl flow of the outside air introduced as a result is arranged along the circumferential direction.

A hood opening adjusting device 7 for adjusting the opening area of the exhaust hood 1 is provided at the outer peripheral edge of the exhaust hood 1.
Is swingably provided by the actuator 8.

Further, in the exhaust duct 3, a smoke sensor 9 for detecting the presence and amount of smoke in the exhaust duct 3, a gas sensor 10 for identifying the type of gas, and a pressure for detecting the pressure in the exhaust duct 3. A sensor 11 is installed, and a pressure sensor 12 that detects the pressure in the exhaust hood 1 is installed in the exhaust hood 1, and the smoke sensor 9, the gas sensor 10, the pressure sensors 11 and 1 are installed.
The detection signal of 2 is input to the controller 13.

The controller 13 measures smoke concentration and generation speed of smoke based on the signal from the smoke sensor 9, and outputs the output signal in accordance with the measured value. The smoke concentration measuring means 14 and the signal from the gas sensor 10 indicate the type of gas. The pressure difference between the exhaust hood 1 and the exhaust duct 3 based on the detection signals from the exhaust gas identification means 15 that outputs the identification signal and the pressure sensors 11 and 12, and outputs the output signal according to the pressure difference. The difference detection means 16, the exhaust fan rotation control means 17 that controls the rotation speed of the exhaust fan 2 based on the output signal from the smoke concentration measurement means 14, and the air supply fan 4 based on the output signal from the exhaust gas identification means 15. The air supply fan rotation control means 18 for controlling the number of rotations of the air supply fan and the actuator 8 based on the output signal from the pressure difference detection means 16,
The hood opening setting means 19 for setting the opening of the hood opening adjusting device 7, the exhaust fan rotation control means 17, the air supply fan rotation control means 18, and the exhaust operation pattern set by the hood opening setting means 19. It has an exhaust mode storage means 20 which stores the data into a mode and operates the exhaust fan rotation control means 17, the air supply fan rotation control means 18 and the hood opening degree setting means 19 in accordance therewith.

According to the above exhaust device, however, the exhaust load of smoke, exhaust heat, gas mist, odor, etc., generated inside the smoke sensor 9, the gas sensor 10, and the pressure sensor 1, respectively.
1 and 12 to smoke concentration measuring means 14 and exhaust gas identifying means 1
5. The exhaust fan rotation control means 17, the air supply fan rotation control means 18, and the hood opening degree setting means 19 are respectively detected based on the signals input to the pressure difference detection means 16 and exhausted according to the respective output signals. The rotation speed of the fan 2, the rotation speed of the air supply fan 4, and the opening degree of the hood opening degree adjusting device 7 are controlled to follow and change according to the exhaust load variation.

As a result, the exhaust amount, the effect of attracting the ambient air due to the swirl flow, and the collection efficiency due to the opening of the exhaust hood are changed, and the exhaust characteristics are changed in accordance with the exhaust load change.
Exhaust loads such as smoke, exhaust heat, gas mist, and odor can be reliably exhausted without diffusing into the room.

The exhaust mode storage means 20 can operate the exhaust fan rotation control means 17, the air supply fan rotation control means 18, and the hood opening degree setting means 19 in accordance with the stored exhaust operation pattern.

[0016]

As described above, according to the exhaust system of the present invention, the exhaust characteristic of the exhaust system can be changed in accordance with the exhaust load variation, so that smoke, exhaust heat, gas mist, odor, etc. The exhaust load can be reliably exhausted without diffusing into the room. Therefore, the work content is not restricted and the running cost is not wastefully consumed.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 Exhaust Hood 2 Exhaust Fan 3 Exhaust Duct 4 Air Supply Fan 5 Air Supply Duct 6 Nozzle 7 Hood Opening Adjustment Device 8 Actuator 9 Smoke Sensor 10 Gas Sensor 11, 12 Pressure Sensor 13 Controller 14 Smoke Concentration Measuring Means 15 Exhaust Gas Identification Means 16 Pressure difference detection means 17 Exhaust fan rotation control means 18 Air supply fan rotation control means 19 Hood opening setting means 20 Exhaust mode storage means

Claims (2)

(57) [Claims] 1. A nozzle for connecting an exhaust duct having an exhaust fan to the exhaust hood to communicate with the outside air, and for generating a swirl flow of the outside air introduced into the exhaust hood through the intake fan and the intake duct. In the exhaust device provided with, a hood opening adjustment device capable of adjusting the opening area is provided at the outer peripheral edge of the exhaust hood, and is provided in the exhaust duct to detect the presence and amount of smoke. A smoke sensor, a gas sensor that identifies the type of gas, and a pressure sensor that detects the pressure, a pressure sensor that is provided in the exhaust hood and that detects the pressure in the hood, and a detection signal from the smoke sensor. Exhaust fan rotation control means for controlling the rotation speed of the exhaust fan, and an air supply fan for controlling the rotation speed of the air supply fan according to an identification signal from the gas sensor. And a hood opening setting means for setting the opening of the hood opening adjusting device according to the pressure difference detected by the pressure sensors. Exhaust system. 2. The controller stores the exhaust operation pattern set by the exhaust fan rotation control means, the air supply fan rotation control means, and the hood opening setting means into a mode, and accordingly, the exhaust fan rotation control means. The exhaust system according to claim 1, further comprising: an exhaust mode storage unit that operates the air supply fan rotation control unit and the hood opening degree setting unit.