Range hood and resonance abnormal noise eliminating method thereof

Abstract

The invention discloses a range hood. The range hood comprises a fan system, a control module and a motor driving module which drives the fan system according to a signal of the control module; the fan system comprises a motor; the motor is a direct current motor; the range hood is characterized by further comprising a sound sensor used for acquiring a sound signal of the range hood and a vibration sensor used for acquiring a vibration signal of the motor; and the vibration sensor and the sound sensor are both connected to the control module. The invention further discloses a resonance abnormal noise eliminating method of the range hood. Compared with the prior art, the range hood and the resonance abnormal noise eliminating method thereof have the advantages that the working state of therange hood is identified through cooperative work of the vibration sensor and the sound sensor, and resonance abnormal noise of the range hood is eliminated by changing the rotating speed of the direct current motor by means of changing a current value in a failure state of the resonance abnormal noise; and the range hood and the resonance abnormal noise eliminating method thereof have very good adaptability to the problem of inherent frequency instability caused by indetermination of back pressure and process problems.

Description

technical field [0001] The invention relates to a cooking fume purifying device, in particular to a range hood and a method for eliminating resonance and abnormal noise of the range hood. Background technique [0002] Range hoods have become one of the indispensable kitchen appliances in modern families. The range hood uses the principle of fluid dynamics to work, sucks and exhausts the range hood through a centrifugal fan installed inside the range hood, and uses a filter to filter some grease particles. The centrifugal fan includes a volute, an impeller installed in the volute and a motor that drives the impeller to rotate. When the impeller rotates, a negative pressure suction is generated in the center of the fan, and the oil fume under the range hood is sucked into the fan, and after being accelerated by the fan, it is collected by the volute and guided out of the room. [0003] At present, DC motors have been used in the fan system of range hoods. Due to the structur...

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Problems solved by technology

[0004] However, ①Due to the different air duct resistance coefficients of each user’s home (this is especially obvious in the case of different pipe diameters in different overseas countries), and the different floors of the user’s home, and the peak season of cooking, etc., the back pressure will also be different, so each The actual rotation frequency of the range hood motor is different for each user in each state, and there will be situations where the range hood has no resonance and abnormal sound when it is in the laboratory or leaving the factory, but it produces resonance and abnormal sound when it arrives at the user's home; ②Actually found that, In the case of the same structure and material, due to process problems, the natural frequency of the same batch of parts will also be different, which creates new problems for eliminating resonance and abnormal noise through the above method; ③ Change the structure and material of parts, thereby changing Its natural frequency, the method of eliminating resonance and abnormal sound cannot guarantee that the resonance and abnormal sound can be eliminated under all back pressure conditions. Due to process problems, there are still differences in the natural frequency of the same structure and the same material, and the consistency cannot be guaranteed, and due to different structures and different materials The natural frequency is different, and every time a new product is researched, it must be re-researched, which is time-consuming and labor-intensive

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