Variable-frequency range hood and variable-frequency control method thereof

Abstract

The invention provides a variable-frequency range hood. The variable-frequency range hood comprises a fan motor, a motor power supply module and a power supply plate; the power supply plate is provided with a fan motor power supply interface; the variable-frequency range hood is characterized by further comprising a controller and a storage module which are supplied with power by the power supplyplate; the storage module is used for storing data which is to be read by the controller; the motor power supply module comprises a mains supply and a frequency converting module, wherein the frequency converting module is used for converting the frequency of the mains supply into a specified frequency under the control of the controller. The variable-frequency range hood provided by the inventionhas the advantages that the range hood realizes frequency conversion by virtue of the frequency converting module which is combined with the mains supply; relatively power-wasting speed regulating windings need not to be connected in series for speed regulation in a frequency conversion process; a relatively high frequency conversion efficiency is realized; moreover, the frequency can be converted rapidly to realize the regulation of the range hood within a larger rotating speed range, so that the requirement of small-air-volume soup cooking of a user and the requirement of a high-rotating-speed large air volume for a public flue in stir-frying can be satisfied; under a severe working condition, the rotating speed of the motor can be greatly regulated in order to prevent escaping of the smoke; and under a less-smoke condition, the variable-frequency range hood can run at a relatively low frequency, thereby reducing the energy consumption of the overall range hood and improving the user experiences.

Description

technical field [0001] The invention relates to a range hood, in particular to a frequency conversion range hood and a frequency conversion control method thereof. Background technique [0002] At present, the AC motor of the range hood has a rotation speed of only 1500 rpm due to the synchronization of the magnetic field within 50 Hz of the mains supply. Since its overall rotation speed cannot exceed 1500 rpm, it cannot achieve a greater effective air volume in a public flue environment with high resistance. For example, in the case of a large change in cooking fume such as stir frying, if the fan motor is limited by the speed of 1500 rpm, a large amount of cooking fume generated by stir frying will not be able to be sucked into the range hood, and the escaping cooking fume will pollute the kitchen air. In view of the above-mentioned defect that the frequency conversion of the AC motor cannot be performed, a frequency conversion range hood that uses a frequency conversion m...

AI Technical Summary

Problems solved by technology

[0002] At present, the AC motor of the range hood has a rotation speed of only 1500 rpm due to the synchronization of the magnetic field within 50 Hz of the mains. Since its overall rotation speed cannot exceed 1500 rpm, it cannot achieve a greater effective air volume in a public flue environment with high resistance.

For example, in the case of large changes in cooking fumes such as stir-frying, if the fan motor is limited by the speed of 1500 rpm, a large amount of cooking fumes generated by stir-frying cannot be sucked into the range hood, and the escaping fumes will pollute the kitchen air.

In view of the above-mentioned defect that the frequency conversion of the AC motor cannot be performed, a frequency conversion range hood that uses a frequency conversion motor to adjust the motor speed has been disclosed in the prior art, such as a Chinese utility model patent with the patent number ZL 201420826305.3 (the authorized announcement number is CN 204373022 U) The disclosed "An Intelligent Variable Frequency Range Hood" includes a fume collecting hood, a control component and a fan component. The control component includes a power supply module, a system control module and a motor drive module that are electrically connected in sequence. The motor of the fan component is an AC variable frequency The motor and the control assembly also include an environment detection module and a flue negative pressure detection module respectively connected between the power supply module and the system control module. At the exhaust port of the fan assembly

The intelligent variable frequency range hood adopts an AC variable frequency motor, and only one circuit board is used to adjust the running speed of the AC variable frequency motor, so as to realize the control of stepless speed change. speed, not only the adjustment range is small, the efficiency is low, but also the energy consumption is high, which is not conducive to energy saving

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