Kitchen smoke discharging system and extractor hood draught fan rotation speed control method thereof

Abstract

A kitchen smoke discharging system comprises an extractor hood arranged in a kitchen. The extractor hood comprises a draught fan and is characterized in that a first door and window sensor arranged ona kitchen window and a second door and window sensor arranged on a kitchen door are further included; a cooking fume sensor capable of sensing the cooking fume concentration is further included, theextractor hood is provided with a controller capable of reading output signals of the first door and window sensor, the second door and window sensor and the cooking fume sensor, and the controller can correspondingly control the rotation speed of the draught fan according to the received signals. The kitchen smoke discharging system has the advantages that the kitchen smoke discharging system cancorrespondingly control the rotation speed of the draught fan according to the output signals of the door and window sensors, the door and window sensors are used for obtaining indoor factors high ininterference on the cooking fume sucking effect, the cooking fume concentration information can be obtained in combination with the cooking fume sensor, the gear and the air volume of the draught fanare correspondingly adjusted, the disturbance situation possibly happening can be better prejudged in a front arranging manner, self-adaptive adjustment is achieved, and accordingly user experience is greatly improved.

Description

technical field [0001] The invention relates to a kitchen smoke exhaust system, in particular to a kitchen smoke exhaust system and a method for controlling the speed of a range hood fan. Background technique [0002] Range hoods are essential electrical appliances for people to cook and smoke in daily life. The motors of traditional range hoods use fixed gears or rotational speeds, which have poor anti-interference and self-adaptability to flue resistance and natural wind convection when doors and windows are opened at the same time. The existing traditional oil fume escape interference detection method mainly uses the oil fume sensor or camera to detect whether there is smoke or the change of quantitative value to judge the size of the oil fume and whether there is escape. These detection methods are to increase the speed or target air volume after the oil fume diffuses out Although the post-feedback adsorption can be intelligently controlled according to the size of the o...

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Problems solved by technology

The above-mentioned automatic air volume adjustment control device and control method have a certain hysteresis, because the compensation amount of the air volume is calculated from the deviation of the oil fume or water vapor concentration detected by the sensor group from the initial setting range, and the current required air volume value is determined, and the fan It takes a certain amount of time for the speed of the motor to reach the value of the required air volume gear. For example, when stir-frying, the fan motor of the range hood has not rotated at the beginning or is still at a small air volume speed. The oil fume concentration information is transmitted to the control device. Before the control device makes the speed of the fan motor reach a value sufficient to discharge the large air volume required for the current oil fume, some oil fume has spread outward, polluting the kitchen environment

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