Range hood noise reduction system and method based on corona discharge

Abstract

The invention discloses a range hood noise reduction system and method based on corona discharge, and relates to the technical field of range hoods. The device comprises a corona discharge module, a high-voltage power supply module, a noise acquisition module and a control module, the corona discharge module is arranged in the middle of an air inlet channel of the range hood; the corona discharge module comprises a high-voltage electrode and a low-voltage electrode; the high-voltage power supply module is arranged on the range hood shell; the high-voltage power supply module is used for outputting high-voltage direct current to the high-voltage electrode and ionizing air to generate charged particles; and the high-voltage power supply module is used for outputting high-voltage alternating current to the low-voltage electrode, so that the charged particles move to generate sound waves. The beneficial effects are that the corona discharge module replaces a traditional loudspeaker, double-side sound production can be realized, structural members such as a vibrating diaphragm and a magnet are not needed, adverse effects of oil stains and high-temperature oil smoke are avoided, and long-term stability of a noise reduction effect can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and in particular to a range hood noise reduction system and method based on corona discharge. Background Art

[0002] To maintain clean air and reduce the health risks of cooking fumes, range hoods have become essential appliances in most kitchens. However, the noise they inevitably generate during operation can hinder communication and negatively impact human health. Currently, active noise reduction (also known as active noise reduction or active control) is commonly used to mitigate this noise.

[0003] The existing active noise reduction method is mainly a noise reduction system based on traditional speakers, which usually includes a noise collector, a sound signal generator and a speaker. The noise generated by the range hood is collected by the noise collector and transmitted to the sound signal generator. The sound signal generator generates a sound signal with the same amplitude and opposite phase as the range hood noise based on the collected noise signal, and then broadcasts the sound signal through the speaker, so that the sound wave offsets the range hood noise, thereby achieving the noise reduction effect.

[0004] Chinese invention patent application CN107166458A discloses a range hood with active noise reduction, including a sound collection device and a sound generating device. The sound collection devices are distributed on the left and right sides of the range hood fan, and the sound generating device is integrated on the left and right sides below the range hood fan; the sound collection device is composed of a sound collection device cavity, a high-frequency broadband noise sound-absorbing sponge and a reference sensor; the sound generating device is composed of a sound generator cavity, a sound generator cover, a sound generator high-frequency sound-absorbing sponge and a speaker; a signal-controlled sound generator is placed in the sound generator cavity of the sound generator, and the signal-controlled sound generator is wired to the reference sensor, and the signal-controlled sound generator is wired to the speaker through D / A conversion; the invention can effectively remove line spectrum noise and low-frequency broadband noise in the noise, thereby improving the sound quality of the range hood.

[0005] Chinese invention patent CN111899712A discloses an active noise reduction device and method for a range hood. The device comprises a first noise pickup component mounted on the lower air intake grille of the range hood, a second noise pickup component mounted on or at the center of the lower end surface of the range hood, a speaker component mounted below the air intake grille and above the lower end surface of the range hood, and a controller. The speaker component's horn faces the lower front of the range hood. The first noise pickup component, the second noise pickup component, and the speaker component are connected to the controller. This invention fully utilizes the potential of the noise reduction system to achieve spatial noise reduction in the range hood.

[0006] However, the active noise reduction system of the above invention still uses a traditional speaker as a sound-generating device. When the range hood is operating, a large amount of oil will flow through the speaker and adhere to the surface of the speaker's diaphragm. After long-term operation, the mass of the diaphragm increases, affecting the noise reduction effect. At the same time, oil smoke has a certain temperature. When the speaker is operating in a high-temperature environment, on the one hand, high-temperature demagnetization may occur, and on the other hand, the working performance of the diaphragm will also be affected to a certain extent, thereby reducing the noise reduction effect. In addition, the speaker can only emit sound from one side. When it is placed in the middle of the range hood's air inlet, at least two speakers are required to achieve noise reduction. This makes the noise reduction module larger and increases the resistance of the flow field. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to address the above-mentioned technical deficiencies and provide a range hood noise reduction system and method based on corona discharge. The system replaces the traditional speaker with a corona discharge module, which can achieve double-sided sound. At the same time, it does not require structural parts such as diaphragms and magnets, thus avoiding the adverse effects of oil stains and high-temperature oil smoke, and can ensure the long-term stability of the noise reduction effect.

[0008] The technical solution adopted by the present invention is: providing a range hood noise reduction system based on corona discharge, comprising a corona discharge module, a high-voltage power supply module, a noise collection module and a control module;

[0009] The corona discharge module is arranged in the middle of the range hood air inlet channel; the corona discharge module includes a high voltage pole and a low voltage pole;

[0010] The high-voltage power supply module is arranged on the range hood housing; the high-voltage power supply module is used to output high-voltage direct current to the high-voltage electrode to ionize the air and generate charged particles; the high-voltage power supply module is used to output high-voltage alternating current to the low-voltage electrode to make the charged particles move and generate sound waves;

[0011] The noise collection module includes a reference microphone for acquiring the noise signal of the range hood when it is working, and an error microphone for acquiring the sound signal of the range hood after noise reduction; the reference microphone is arranged outside the turbine fan of the range hood; the error microphone is arranged outside the corona discharge module;

[0012] The control module is arranged on the range hood casing; the control module is used to obtain the two signals collected by the noise collection module, and output signals through the signal conversion unit to control the high-voltage direct current and high-voltage alternating current output by the high-voltage power supply device.

[0013] To further optimize this technical solution, a corona discharge module of a range hood noise reduction system based on corona discharge has a high-voltage pole composed of multiple metal wire electrodes parallel to each other; the low-voltage pole of the corona discharge module is composed of two porous metal plates parallel to the high-voltage pole, and the two porous metal plates are respectively arranged on both sides of the high-voltage pole.

[0014] To further optimize this technical solution, a range hood noise reduction system based on corona discharge has reference microphones respectively arranged on opposite sides of the outside of the range hood vortex fan; and error microphones respectively arranged on opposite sides of the outside of the corona discharge module.

[0015] To further optimize this technical solution, a signal conversion unit of a range hood noise reduction system based on corona discharge includes an A / D conversion circuit, a DSP processor and a D / A conversion circuit; the A / D conversion circuit is used to convert the received sound signal; the DSP processor is used to process the signal converted by the A / D conversion circuit; the D / A conversion circuit is used to convert the signal processed by the DSP processor into an analog signal and output it to the high-voltage power supply module.

[0016] A range hood noise reduction method based on corona discharge comprises the following steps:

[0017] S1. When the range hood is operating, the noise generated by the turbine fan spreads to the surrounding area. The reference microphone obtains the primary noise signal and transmits it to the control module. The error microphone obtains the noise-reduced sound signal and transmits it to the control module.

[0018] S2, the control module performs A / D conversion on the two sound signals, and then after being processed by the DSP processor, converts them into analog signals through D / A and transmits them to the high-voltage power supply module;

[0019] S3, the high-voltage power supply module controls the output of high-voltage direct current and high-voltage alternating current respectively according to the input analog signal;

[0020] S4. High-voltage direct current is output to the high-voltage pole to ionize the air and produce charged particles; high-voltage alternating current is output to the low-voltage pole. By changing the amplitude, frequency and phase of the high-voltage alternating current, the movement of the charged particles is controlled to generate sound waves with equal amplitude and opposite phase to the range hood noise, thereby achieving range hood noise reduction.

[0021] The beneficial effects of the present invention are:

[0022] The reference microphone and error microphone of the noise collection device are used to collect the noise signal emitted by the turbine fan and the sound signal after noise reduction processing respectively. After the signal is processed by the control module, the output of the high-voltage power supply module is controlled accordingly, so that the high-voltage direct current and high-voltage alternating current output by the high-voltage power supply module can adapt to the sound signal received in real time. The discharge characteristics of the corona discharge device are controlled accordingly, so that it can generate charged particles by discharging into the air, and the movement of the charged particles is controlled to generate sound waves with the same amplitude and opposite phase as the range hood noise, thereby achieving range hood noise reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structural state of the present invention.

[0024] In the figure, 1. Air inlet grille; 2. Lower shell; 3. Turbine fan; 4. Upper shell; 5. High voltage pole; 6. Low voltage pole; 7. Reference microphone; 8. Error microphone; 9. Control module; 10. High voltage power supply module. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 As shown, a range hood noise reduction system based on corona discharge includes a corona discharge module, a high-voltage power supply module 10, a noise collection module and a control module 9;

[0027] The corona discharge module is arranged in the middle of the range hood air inlet channel, and can be arranged inside the range hood air inlet grille 1 and in the middle of the lower shell 2; the corona discharge module includes a high voltage electrode 5 and a low voltage electrode 6;

[0028] The high-voltage power supply module 10 is provided on the range hood housing; the high-voltage power supply module 10 is used to output high-voltage direct current to the high-voltage electrode 5 to ionize the air and generate charged particles; the high-voltage power supply module 10 is used to output high-voltage alternating current to the low-voltage electrode 6 to cause the charged particles to move and generate sound waves;

[0029] The noise acquisition module includes a reference microphone 7 for acquiring noise signals when the range hood is in operation, and an error microphone 8 for acquiring sound signals after noise reduction from the range hood; the reference microphone 7 is provided outside the range hood turbine fan 3 and can be mounted on the inner wall of the range hood upper housing 4; the error microphone 8 is provided outside the corona discharge module and can be mounted inside the range hood lower housing 2, located on the lower inner wall of the range hood upper housing 4;

[0030] The control module 9 is mounted on the range hood housing. It is used to acquire the two signals collected by the noise acquisition module and, through the output signals from the signal conversion unit, control the high-voltage direct current and high-voltage alternating current output by the high-voltage power supply. The control module 9 and high-voltage power supply module 10 can be positioned at the angle between the outer sides of the range hood's lower housing 2 and upper housing 4.

[0031] When the range hood is turned on, the corona discharge module is turned on synchronously. The reference microphone 7 obtains the noise signal of the range hood and transmits it to the control module 9. The error microphone 8 obtains the noise-reduced signal and also transmits it to the control module 9. After the control module 9 collects the two signals, it is processed by the control module 9 and then output to the high-voltage power supply module 10. The DC high voltage output by the high-voltage power supply module 10 is applied to the high-voltage pole 5 of the corona discharge module, and the air is ionized by gas discharge to generate charged particles. The AC high voltage output by the high-voltage power supply is applied to the porous plate low-voltage pole 6 of the corona discharge module to control the movement of the particles and generate sound waves with the same amplitude and opposite phase as the range hood noise, thereby achieving range hood noise reduction.

[0032] This application utilizes the ionization of air to make charged particles move and generate sound waves to offset the noise of the range hood. Compared with the noise reduction system that uses traditional speakers to produce sound, this application is less affected in harsh environments with high temperature and high oil smoke, can perform noise reduction work more stably for a longer period of time, has higher reliability, and does not occupy too much space inside the range hood, causing little resistance to the range hood's oil smoke extraction, with outstanding advantages.

[0033] The high-voltage electrode 5 is composed of multiple parallel metal wire electrodes; the low-voltage electrode 6 is composed of two porous metal plates, each parallel to the high-voltage electrode 5, and the two porous metal plates are placed on either side of the high-voltage electrode 5. This structure enables dual-sided sound generation, reduces the occupied volume, and reduces the resistance of the noise reduction system. In this solution, the spacing between the high-voltage electrode 5 and the low-voltage electrode 6 of the corona discharge device is 6mm. The high-voltage electrode 5 is composed of 14 parallel nickel-chromium alloy wires with a diameter of 0.1mm and a length of 15cm. The spacing between adjacent wires is 1cm. The low-voltage electrode 6 is composed of two 15cm×15cm porous metal plates with a pore size of 3mm, a thickness of 1mm, and a porosity of approximately 40%.

[0034] like Figure 1 As shown, reference microphones 7 are located on opposite sides of the range hood's vortex blower, while error microphones 8 are located on opposite sides of the corona discharge module. This dual-sided arrangement of reference and error microphones 7 and 8 ensures more stable and reliable sound pickup, ensuring the accuracy of received sound signals.

[0035] The signal conversion unit includes an A / D conversion circuit, a DSP processor and a D / A conversion circuit; the A / D conversion circuit is used to convert the received sound signal; the DSP processor is used to process the signal converted by the A / D conversion circuit; the D / A conversion circuit is used to convert the signal processed by the DSP processor into an analog signal and output it to the high-voltage power supply module 10.

[0036] The signal conversion unit processes the received sound signal and then outputs it, thereby enabling precise control of the high-voltage power supply module 10 when outputting high-voltage direct current and high-voltage alternating current.

[0037] A range hood noise reduction method based on corona discharge comprises the following steps:

[0038] S1. When the range hood is working, the noise generated by the turbine fan 3 propagates to the surroundings. The reference microphone 7 obtains the primary noise signal and transmits it to the control module 9. The error microphone 8 obtains the noise-reduced sound signal and transmits it to the control module 9.

[0039] S2, the control module 9 performs A / D conversion on the two sound signals, and then after being processed by the DSP processor, converts them into analog signals through D / A and transmits them to the high-voltage power supply module 10;

[0040] S3, the high-voltage power supply module 10 controls the output of high-voltage direct current and high-voltage alternating current respectively according to the input analog signal; under the given geometric structure and size conditions of the corona discharge module, the voltage of the high-voltage direct current is usually set to be maintained between 8kV and 9kV, the voltage of the high-voltage alternating current is set to be between 100V and 600V, and the frequency is within the range of 50 to 8000Hz;

[0041] S4. High-voltage direct current is output to the high-voltage pole 5 to ionize the air and generate charged particles. High-voltage alternating current is output to the low-voltage pole 6. By changing the amplitude, frequency and phase of the high-voltage alternating current, the movement of the charged particles is controlled to generate sound waves with equal amplitude and opposite phase to the range hood noise, thereby achieving range hood noise reduction.

[0042] It will be understood that the present invention is described by way of some embodiments, and it will be appreciated by those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A range hood noise reduction system based on corona discharge, characterized by: It includes a corona discharge module, a high-voltage power supply module (10), a noise collection module and a control module (9); The corona discharge module is arranged in the middle of the range hood air inlet channel; the corona discharge module comprises a high voltage electrode (5) and a low voltage electrode (6); The high-voltage power supply module (10) is arranged on the range hood housing; the high-voltage power supply module (10) is used to output high-voltage direct current to the high-voltage electrode (5) to ionize the air and generate charged particles; the high-voltage power supply module (10) is used to output high-voltage alternating current to the low-voltage electrode (6) to cause the charged particles to move and generate sound waves; The noise collection module comprises a reference microphone (7) for acquiring a noise signal when the range hood is in operation, and an error microphone (8) for acquiring a sound signal after noise reduction of the range hood; the reference microphone (7) is arranged outside the range hood turbine fan (3); and the error microphone (8) is arranged outside the corona discharge module; The control module (9) is arranged on the range hood housing; the control module (9) is used to obtain two signals collected by the noise collection module, and output signals through the signal conversion unit to control the high-voltage direct current and high-voltage alternating current output by the high-voltage power supply device.

2. The range hood noise reduction system based on corona discharge according to claim 1, characterized in that: The high-voltage electrode (5) is composed of a plurality of metal wire electrodes parallel to each other; the low-voltage electrode (6) is composed of two porous metal plates respectively parallel to the high-voltage electrode (5), and the two porous metal plates are respectively arranged on both sides of the high-voltage electrode (5).

3. The range hood noise reduction system based on corona discharge according to claim 1, characterized in that: The reference microphones (7) are respectively arranged on two opposite sides of the outside of the range hood vortex fan; and the error microphones (8) are respectively arranged on two opposite sides of the outside of the corona discharge module.

4. The range hood noise reduction system based on corona discharge according to claim 1, characterized in that: The signal conversion unit comprises an A / D conversion circuit, a DSP processor and a D / A conversion circuit; the A / D conversion circuit is used for performing signal conversion on a received sound signal; the DSP processor is used for performing signal processing on the signal converted by the A / D conversion circuit; and the D / A conversion circuit is used for converting the signal processed by the DSP processor into an analog signal and outputting it to a high-voltage power supply module (10).

5. A range hood noise reduction method based on corona discharge, using the range hood noise reduction system based on corona discharge according to any one of claims 1 to 4, characterized in that: It includes the following steps: S1. When the range hood is working, the noise generated by the turbine fan (3) propagates to the surroundings, the reference microphone (7) obtains the primary noise signal and transmits it to the control module (9); the error microphone (8) obtains the noise-reduced sound signal and transmits it to the control module (9); S2, the control module (9) performs A / D conversion on the two sound signals, and after being processed by the DSP processor, converts them into analog signals through D / A and transmits them to the high-voltage power supply module (10); S3, a high-voltage power supply module (10) controls the output of high-voltage direct current and high-voltage alternating current respectively according to the input analog signal; S4. High-voltage direct current is output to the high-voltage electrode (5) to ionize the air and generate charged particles; high-voltage alternating current is output to the low-voltage electrode (6). By changing the amplitude, frequency and phase of the high-voltage alternating current, the movement of the charged particles is controlled to generate sound waves with the same amplitude and opposite phase to the range hood noise, thereby achieving range hood noise reduction.

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