Refrigeration range hood and active noise reduction method of refrigeration range hood

Abstract

The embodiment of the invention provides a refrigeration range hood and an active noise reduction method of the refrigeration range hood. The refrigeration range hood comprises a range hood body and a noise reduction device, an air conditioner; the sound acquisition device is used for acquiring sound signals generated during operation of the range hood and the air conditioner; the control device is used for receiving the sound signal acquired by the sound acquisition device and generating an anti-phase sound wave signal according to the sound signal; and the sound output device is used for receiving the anti-phase sound wave signal generated by the control device and outputting the anti-phase sound wave signal. The operation noise of the range hood and the air conditioner is monitored in real time through the sound collection device, the control device generates the opposite-phase sound waves with opposite phases, the noise is counteracted through the sound output device, the noise reduction effect is more obvious through the active noise reduction mode, and especially the low-frequency noise reduction effect of the refrigeration range hood is remarkable.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration range hoods, and in particular to a refrigeration range hood and an active noise reduction method for the refrigeration range hood. Background Art

[0002] As people increasingly prioritize quality of life and demand a more comfortable home environment, the noise generated by kitchen appliances is becoming a key factor impacting the user experience. This is particularly true for range hoods with integrated cooling functions. Due to their dual functions of exhaust and air conditioning, range hoods have complex noise sources and multiple transmission paths, making them highly susceptible to creating an uncomfortable sound pressure environment during cooking. Refrigeration range hoods have four primary noise sources: the range hood fan, evaporator fan, condenser fan, and compressor, as well as three primary sound radiation paths: the range hood inlet, range hood outlet, and air conditioning outlet. These numerous noise sources and radiation paths contribute to the high noise levels of refrigeration range hoods, with noise from the range hood inlet and air conditioning outlet having the greatest impact on the user's ears.

[0003] The current noise of refrigeration range hoods mainly comes from four sound sources and three key radiation paths. Although existing noise reduction solutions (such as perforating the volute with sound-absorbing cotton and installing sound-absorbing materials on the air cabinet panels) can partially suppress the high-frequency noise of the range hood, they have little effect on improving the low-frequency vibration and air-conditioning system noise, resulting in insignificant noise reduction effect. Summary of the Invention

[0004] In view of the above problems, embodiments of the present invention are proposed to provide a refrigeration range hood and a corresponding active noise reduction method for a refrigeration range hood that overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above problem, a first aspect of an embodiment of the present invention provides a refrigeration range hood, the refrigeration range hood comprising:

[0006] Range hood;

[0007] air conditioner;

[0008] A sound collecting device, used to collect sound signals generated when the range hood and the air conditioner are in operation;

[0009] a control device, configured to receive the sound signal collected by the sound collecting device and generate an anti-phase sound wave signal according to the sound signal;

[0010] The sound output device is used to receive the reverse phase sound wave signal generated by the control device and output the reverse phase sound wave signal.

[0011] Optionally, the range hood includes an air inlet; the air conditioner includes an air outlet; the sound signal includes a source sound and a feedback sound; the sound collection device includes a source sound collection device and a feedback sound collection device;

[0012] The sound source sound collecting device is used to collect the sound source sounds inside the air conditioner and the range hood;

[0013] The feedback sound collecting device is used to collect feedback sounds at the air inlet of the range hood and the air outlet of the air conditioner;

[0014] The control device is used to receive the sound source sound and the feedback sound, and perform inversion processing on the sound source sound to obtain an initial inverted sound wave signal; and adjust the parameters of the initial inverted sound wave signal according to the feedback sound to obtain the inverted sound wave signal.

[0015] Optionally, the range hood includes a range hood cabinet; the sound source sound collecting device includes a first sound source sound collecting device; the first sound source sound collecting device is arranged on the inner side wall of the range hood cabinet, and is used to collect the sound source sound inside the range hood cabinet.

[0016] Optionally, the air conditioner includes a range hood outlet duct; the sound source sound collecting device includes a second sound source sound collecting device; the second sound source sound collecting device is arranged on the outer side wall of the range hood outlet duct, and is used to collect the sound source sound inside the air conditioner.

[0017] Optionally, the range hood further includes an oil deflector plate; the oil deflector plate is close to the air inlet of the range hood; the feedback sound collection device includes a first feedback sound collection device; the first feedback sound collection device is arranged above the oil deflector plate, for collecting feedback sound at the air inlet of the range hood.

[0018] Optionally, the feedback sound collecting device includes a second feedback sound collecting device; the second feedback sound collecting device is arranged above the air outlet of the air conditioner, and is used to collect feedback sound at the air outlet of the air conditioner.

[0019] Optionally, the range hood further includes a guide plate; the guide plate is above the range hood air inlet of the range hood; the sound output device includes a first sound output device; the first sound output device is arranged between the guide plate and the range hood casing of the range hood, and is used to output the anti-phase sound wave signal.

[0020] Optionally, the air conditioner also includes an air-conditioning outlet component; the sound output device includes a second sound output device; the second sound output device is arranged below the air-conditioning outlet component and on the outer side wall of the range hood, and is used to output the anti-phase sound wave signal.

[0021] Optionally, the sound collecting device and the sound output device are sealed by a sealing device.

[0022] According to a second aspect of an embodiment of the present invention, there is provided an active noise reduction method for a refrigeration range hood, which is applied to any of the refrigeration range hoods described above, and the method comprises:

[0023] Acquiring the sound of a sound source inside the refrigeration range hood;

[0024] According to the sound source sound, performing inversion processing on the sound source sound to obtain an initial inverted sound wave signal;

[0025] Acquiring feedback sounds from the range hood air inlet and the air conditioning outlet of the refrigeration range hood;

[0026] Adjusting the parameters of the initial reverse phase sound wave signal according to the feedback sound to obtain a reverse phase sound wave signal;

[0027] The anti-phase sound wave signal is output to reduce the noise of the refrigeration range hood.

[0028] The technical solutions provided by the embodiments of the present invention may have the following beneficial effects:

[0029] An embodiment of the present invention provides a refrigeration range hood and an active noise reduction method for the refrigeration range hood. The refrigeration range hood includes: a range hood; an air conditioner; a sound collection device for collecting sound signals generated during the operation of the range hood and air conditioner; a control device for receiving the sound signals collected by the sound collection device and generating an inverted sound wave signal based on the sound signals; and a sound output device for receiving the inverted sound wave signal generated by the control device and outputting the inverted sound wave signal. The sound collection device monitors the operating noise of the range hood and air conditioner in real time, and the control device generates an inverted sound wave with an opposite phase. The sound output device is used to cancel the noise, thereby canceling the composite noise of the range hood and air conditioner, avoiding the noise amplification problem caused by the superposition of multiple devices. This active noise reduction method makes the noise reduction effect more obvious, especially for the low-frequency noise of the refrigeration range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural block diagram of a refrigeration range hood provided by an embodiment of the present invention;

[0031] Figure 2 This is an external structural diagram of a refrigeration range hood provided by an embodiment of the present invention;

[0032] Figure 3 This is a diagram of the internal structure of a refrigeration range hood provided by an embodiment of the present invention;

[0033] Figure 4This is a diagram showing the internal structure of another refrigeration range hood provided by an embodiment of the present invention;

[0034] Figure 5 This is a flowchart of the steps of an active noise reduction method for a refrigeration range hood provided by an embodiment of the present invention;

[0035] Figure 6 The present invention provides a flow chart of an active noise reduction method for a range hood refrigeration appliance.

[0036] Description of reference numerals:

[0037] Refrigeration range hood 10, range hood 101, air conditioner 102, sound collection device 103, control device 104, sound output device 105, range hood air inlet 1011, air conditioner air outlet 1021, sound source sound collection device 1031, feedback sound collection device 1032, range hood air cabinet 1012, range hood air outlet pipe 1022, oil guide plate 1013, guide plate 1014, air conditioner air outlet component 1023. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] The noise generated by the refrigeration range hood during operation has a great impact on the user's ears. The existing methods mainly involve making small holes in the range hood volute and sticking sound-absorbing cotton, or sticking sound-absorbing cotton on the range hood air cabinet panel. However, these methods only reduce the medium and high-frequency noise of the range hood, and the low-frequency noise of the range hood and the noise of the air conditioner are still not solved, resulting in an insignificant noise reduction effect.

[0040] One of the core concepts of this embodiment is that a sound collection device monitors the operating noise of the range hood and air conditioner in real time, a control device generates anti-phase sound waves with opposite phases, and a sound output device outputs the anti-phase sound wave signal to cancel the noise. This cancels out the combined noise of the range hood and air conditioner, avoiding the noise amplification caused by the superposition of multiple devices. This active noise reduction method achieves a more pronounced noise reduction effect, especially for the low-frequency noise of the refrigeration range hood.

[0041] Reference Figure 1 , shows a structural block diagram of a refrigeration range hood provided by an embodiment of the present invention;

[0042] Refrigerated range hoods combine fume extraction and kitchen cooling functions, addressing the inability of traditional range hoods to cool kitchen temperatures and improving summer cooking comfort. Similar to traditional range hoods, a motor-driven fan draws away fumes and odors, separating them through a filter or oil screen before exhausting them outdoors. They also feature built-in air conditioning, delivering cool air to the kitchen through a cold air outlet to lower the ambient temperature.

[0043] The refrigeration range hood 10 includes:

[0044] Range Hood 101;

[0045] A range hood (also known as a range hood or exhaust hood) is a vital appliance in the kitchen that extracts cooking fumes, odors, and heat. It effectively improves kitchen air quality and reduces grease deposits. It quickly removes cooking fumes, preventing them from spreading to other rooms. It also separates grease through a filter or oil cup, reducing contamination in pipes.

[0046] Air conditioning 102;

[0047] Air conditioners use compressor cooling or water-cooled evaporative technology to cool the kitchen. Compressor models utilize a refrigerant cycle to efficiently absorb heat, lowering the cooking area temperature. However, this requires drainage piping and space for heat dissipation. Water-cooled models use water evaporation to reduce costs, but at the expense of slightly higher humidity levels. Refrigerated range hoods utilize compressor cooling, utilizing the range hood system for efficient heat removal, and employ a condenser and pump motor to address condensation issues.

[0048] In the embodiment of the present invention, when the refrigeration range hood is in use, oil smoke enters through the range hood air inlet in the lower portion of the unit and is then exhausted through the smoke duct. The condensing fan of the air conditioner in the upper portion of the unit adopts a dual or single air inlet configuration, with its air outlet connected to the range hood air cabinet. Therefore, condensed hot air passes through the condensing fan and is discharged into the range hood air cabinet. It is then driven by the range hood fan and ultimately exhausted through the smoke duct. The evaporating fan of the air conditioner adopts a single air inlet configuration, with its air outlet connected to the air conditioner outlet component. Therefore, the evaporated cold air is ultimately blown forward from the front of the unit.

[0049] Based on the operating principle described above, we can infer that refrigeration range hoods have four main sound sources: the range hood fan, evaporator fan, condenser fan, and compressor, as well as three main sound radiation paths: the range hood air inlet, range hood outlet, and air conditioner outlet. These numerous sound sources and sound radiation paths make refrigeration range hoods quite noisy, with the range hood inlet and air conditioner outlet noise having the greatest impact on the user's ears.

[0050] A sound collecting device 103 is used to collect sound signals generated when the range hood 101 and the air conditioner 102 are in operation;

[0051] Sound collection devices are electronic devices used to capture, process, and analyze ambient sound waves. Their core component is a microphone sensor, which works in conjunction with signal processing circuitry to digitize sound. Based on their principle, they can be categorized as capacitive, dynamic, and MEMS microphones. They are primarily used to collect noise from the main sound sources of range hoods during operation (such as the range hood fan, evaporator fan, condenser fan, and compressor), as well as from the main sound radiation paths (such as the range hood air inlet, range hood outlet, and air conditioner outlet).

[0052] The sound collection device is connected to the control device, and the sound collection device collects the sound signals generated by the range hood and air conditioner in the refrigeration range hood during operation, including the sound signals at the main sound source and the sound radiation path, and sends the collected sound signals to the control device for subsequent noise reduction processing.

[0053] The control device 104 is configured to receive the sound signal collected by the sound collecting device and generate an anti-phase sound wave signal according to the sound signal;

[0054] A control device is a hardware or software-hardware system used to regulate and manage equipment operation, typically consisting of sensors and controllers. Its core functions include signal reception, logical operations, and output control.

[0055] Anti-Phonic Signal is a specialized acoustic technology used to cancel or interfere with specific acoustic signals. By generating a sound wave with the same amplitude but opposite phase as the target sound wave, it cancels out the sound wave energy. It detects ambient noise in real time and generates a corresponding anti-phase sound wave.

[0056] The control device is connected to the sound collection device and is the core processing unit of the active noise reduction system. It is used to receive the sound signal input by the sound collection device and generate anti-phase sound waves with opposite phases in real time to achieve noise cancellation. The device integrates a high-precision analog-to-digital converter / digital-to-analog converter (ADC / DAC), a digital signal processor (DSP), and an adaptive filtering algorithm. Its workflow includes signal reception, analysis and processing, and output control. The sound collection device collects the sound signals generated by the operation of the range hood and air conditioner, as well as the ambient noise, and converts them into digital signals through an analog-to-digital converter. The digital signal processor analyzes the noise frequency band based on Fourier transform and generates an anti-phase sound wave signal. The digital-to-analog converter drives the speaker to emit the anti-phase sound wave to achieve sound wave interference cancellation.

[0057] The sound output device 105 is used to receive the anti-phase sound wave signal generated by the control device 104 and output the anti-phase sound wave signal.

[0058] The sound output device is the terminal execution unit of the active noise reduction system. It is used to receive the reverse-phase digital sound wave signal generated by the control device and convert it into an acoustic signal output, canceling out ambient noise through the principle of acoustic interference. Its operating principle is as follows: it receives the reverse-phase digital sound wave signal from the control device, converts the digital signal into an analog voltage signal, and drives the speaker unit (such as a dynamic coil or flat diaphragm) to efficiently output sound waves, optimizing the speaker's frequency response curve to ensure the cancellation effect in the target frequency band (such as low frequency).

[0059] The sound collection signal, control device, and sound output device together form an Active Noise Control (ANC) system. The sound collection device monitors the operating noise of the range hood and air conditioner in real time. The control device generates anti-phase sound waves with opposite phases, and the sound output device cancels out the noise. This cancels out the combined noise of the range hood and air conditioner, avoiding the noise amplification caused by the superposition of multiple devices. This active noise reduction method enhances the noise reduction effect, especially for the low-frequency noise of the refrigeration range hood.

[0060] An embodiment of the present invention provides a refrigerated range hood, comprising: a range hood; an air conditioner; a sound collection device for collecting sound signals generated during the operation of the range hood and the air conditioner; a control device for receiving the sound signals collected by the sound collection device and generating an inverted sound wave signal based on the sound signals; and a sound output device for receiving the inverted sound wave signal generated by the control device and outputting the inverted sound wave signal. The sound collection device monitors the operating noise of the range hood and the air conditioner in real time, the control device generates an inverted sound wave with an opposite phase, and the sound output device cancels the noise. The composite noise of the range hood and the air conditioner is canceled to avoid the noise amplification problem caused by the superposition of multiple devices. This active noise reduction method makes the noise reduction effect more obvious, especially for the low-frequency noise of the refrigerated range hood.

[0061] Reference Figure 2 , showing the external structure of a refrigerated range hood provided by an embodiment of the present invention. The refrigerated range hood innovatively combines air conditioning functions with traditional range hoods. The refrigerated range hood consists of two parts: the upper part is the air conditioning part 102, and the lower part is the range hood part 101.

[0062] Reference Figure 3 , showing the internal structure of a refrigeration range hood provided by an embodiment of the present invention;

[0063] In one embodiment, the range hood 101 includes a range hood air inlet 1011; the air conditioner 102 includes an air conditioner air outlet 1021; the sound signal includes a sound source sound and a feedback sound; the sound collection device 103 includes a sound source sound collection device 1031 and a feedback sound collection device 1032;

[0064] The range hood's air inlet is the core airflow channel, capturing cooking fume droplets (particle size 0.1-10μm) through negative pressure suction. Located at the bottom of the refrigerated range hood, the air inlet draws in cooking fumes, separating and discharging them through the internal impeller and filter system.

[0065] The air vent is a key component in the range hood system for precise air delivery. It primarily provides targeted cooling, directing the cool airflow to the desired area. Located in the center of the range hood, the air vent delivers targeted cool air to the cooking area (such as where the chef stands).

[0066] The essence of the sound signal is the noise produced by the refrigeration range hood during operation, which is audible to the human ear. This includes both source sound and feedback sound. Source sound is the primary noise generated by the range hood, primarily from the range hood fan, evaporator fan, condenser fan, and compressor. Feedback sound is the noise propagated along the sound radiation path, primarily from the range hood air inlet, outlet, and air conditioner outlet.

[0067] The sound source sound collection device refers to a device or system used to capture, record or transmit sound signals. It is located inside the air conditioner and range hood of the refrigeration range hood and is installed near the device that generates the main noise.

[0068] Feedback sound collection devices are primarily used to capture, analyze, and process system feedback sound. Their core goal is to optimize sound quality, suppress noise, or implement specific control functions. The feedback sound collection device is located near the sound radiation path.

[0069] In one embodiment, the sound source sound collecting device 1031 is used to collect sound sources inside the air conditioner 102 and the range hood 101;

[0070] The sound source acquisition device is placed near the noise source to directly capture the original noise signal generated by the refrigeration range hood during operation. When the refrigeration range hood is cooling, the evaporator fan, condenser fan, and compressor inside the range hood generate noise. When the range hood is operating, the range hood fan also generates noise. The original noise signal is directly collected by the sound source acquisition device.

[0071] In one embodiment, the feedback sound collecting device 1032 is used to collect feedback sounds from the range hood air inlet 1011 and the air conditioner air outlet 1021;

[0072] In this embodiment, the feedback sound collection device serves as a closed-loop monitoring unit of the active noise reduction system, and adopts precise sampling of dual monitoring points (range hood air inlet monitoring point, air conditioner outlet monitoring point). The feedback sound collection device is near the sound radiation path. When the refrigeration range hood is running, the range hood air inlet and the air conditioner outlet will generate low-frequency noise. The low-frequency noise generated by the range hood air inlet and the air conditioner outlet is collected by the feedback sound collection device, and the noise reduction effect of the range hood air inlet and the air conditioner outlet area is monitored in real time. The control device can adjust according to the feedback sound collected by the feedback sound collection device to achieve the best noise reduction effect.

[0073] In one embodiment, the control device 104 is used to receive the source sound and the feedback sound, and perform inversion processing on the source sound to obtain an initial inverted sound wave signal; and adjust the parameters of the initial inverted sound wave signal according to the feedback sound to obtain the inverted sound wave signal.

[0074] Anti-phase acoustic signals are an active noise control method based on the principle of acoustic interference cancellation. By generating acoustic waves with opposite phases and matching amplitudes to the target noise, they achieve efficient noise suppression. The key is destructive acoustic interference. When two acoustic waves with the same frequency and amplitude but opposite phases meet, their energy cancels out, resulting in noise reduction.

[0075] The control device collects the original noise signal through the sound source sound collection device, performs phase inversion processing on the noise signal, and generates a signal with the same frequency and amplitude but opposite phase, that is, generates an initial inverted sound wave. This inverted signal can interfere with the original signal and offset the original signal. Combined with the feedback signal collected by the feedback sound collection device, the inverted sound wave parameters are dynamically optimized, thereby achieving a low-frequency noise control effect that is difficult to achieve with traditional passive noise reduction.

[0076] In this embodiment, the control device serves as the core processing unit of the active noise reduction system. It adopts a multimodal signal processing architecture to achieve high-precision noise cancellation, synchronously receives the sound source signal input by the sound source sound collection device, performs real-time analysis on the sound source signal, extracts the main noise components, generates an initial inverted waveform, and optimizes the inverted sound wave parameters in real time through the error signal of the feedback channel, so as to quickly respond to changes in noise characteristics caused by sudden changes in fan speed.

[0077] Reference Figure 4 , showing the internal structure of another refrigeration range hood provided by an embodiment of the present invention;

[0078] In one embodiment, the range hood 101 includes a range hood cabinet 1012; the sound source sound collection device 1031 includes a first sound source sound collection device; the first sound source sound collection device is arranged on the inner wall of the range hood cabinet 1012, and is used to collect the sound source sound inside the range hood cabinet 1012.

[0079] Range hoods are common equipment in ventilation systems, primarily used for kitchen exhaust, industrial waste gas treatment, and air purification in commercial spaces. In refrigeration range hoods, these hoods refer to fume hoods or bellows, connecting the fan and ductwork to draw in gases containing fumes and exhaust.

[0080] The first sound source acquisition device is a device in an active noise reduction system that directly captures the original sound signal from the noise source, directly obtaining the original sound of the target sound source and transmitting the data in real time. The first sound source acquisition device includes at least one set of measurement microphones. These are the core sensors of the first sound source acquisition device, and their performance directly affects data accuracy. Typically, miniature microphones are used, measuring no more than 5mm in length, width, and height, ensuring accurate data collection without occupying existing air duct space.

[0081] In this embodiment, two groups of signal collection microphones (i.e., four microphones) can be selected and arranged on the inner walls on both sides of the range hood, two on each side. The two microphones on each side are respectively arranged on the front and rear sides of the range hood fan. These four microphones mainly collect the sound source signals inside the range hood, i.e., the range hood fan noise and the condensation hot air exhaust noise, which can not only reduce cost consumption but also more comprehensively cover the sound source signals inside the range hood.

[0082] Two groups of four signal-collecting microphone arrays are deployed at key acoustic monitoring points within the range hood's fume hood. The specific configuration is as follows: First, two groups of signal-collecting microphones are symmetrically placed on the left and right inner walls of the fume hood, each group consisting of two front and rear sampling points. This stereo array design offers three major technical advantages: First, the optimized configuration of spatial sampling points ensures complete coverage of the noise range; second, the front and rear dual-point arrangement effectively captures both mechanical and airflow noise components of the fan; and third, the four-microphone planar array enables noise source localization using a time-delay estimation algorithm. In particular, the microphones utilize a high-temperature and moisture-resistant packaging design, ensuring stable operation in harsh operating conditions and meeting the long-term monitoring requirements of commercial kitchen equipment.

[0083] In one embodiment, the air conditioner 102 includes a range hood outlet pipe 1022; the sound source sound collection device 1031 includes a second sound source sound collection device; the second sound source sound collection device is arranged on the outer wall of the range hood outlet pipe 1022, and is used to collect the sound of the sound source inside the air conditioner 102.

[0084] In a range hood, the exhaust duct is a key component connecting the range hood cabinet to the outside (or a public flue). Its design directly impacts exhaust efficiency, noise levels, and system stability. It efficiently discharges fumes and exhaust gases to the outside while preventing grease accumulation, fire risks, and blockages.

[0085] The second sound source sound collection device is also a device for directly capturing the original sound signal of the noise source, and includes at least one group of signal collection microphones.

[0086] In this embodiment, two sets of signal collection microphones (i.e., four signal collection microphones) are installed on the outer wall of the air conditioner's range hood outlet duct, two on each side of the hood outlet duct, also arranged front to back. These four microphones primarily collect sound source signals from the air conditioner: namely, the condenser fan noise, the evaporator fan noise, and the exhaust noise of the range hood. This reduces costs while more comprehensively capturing noise generated during air conditioner operation.

[0087] The two microphones are symmetrically arranged on each side of the air outlet duct, with a front-to-back staggered arrangement (80-100mm spacing) to enhance the spatial resolution of sound sources. The microphone mounting surfaces are flush with the duct's outer wall to prevent protruding structures from impacting airflow while ensuring an acoustic seal. Compared to traditional 6-8 microphone solutions, this embodiment uses four microphones, yet still covers major noise sources through optimized spatial sampling.

[0088] In one embodiment, the range hood 101 further includes an oil guide plate 1013; the oil guide plate 1013 is close to the range hood air inlet 1011; the feedback sound collection device 1032 includes a first feedback sound collection device; the first feedback sound collection device is arranged above the oil guide plate 1013, and is used to collect feedback sound at the range hood air inlet 1011.

[0089] The oil deflector is a key component in range hoods, used to guide oil droplets, reduce oil accumulation, and improve grease separation efficiency. Its structural design condenses and directs oil droplets in the fumes, reducing oil adhesion, reducing cleaning frequency, optimizing airflow, and minimizing secondary oil droplet dispersion caused by turbulence. Typically, the oil deflector is located below the filter near the range hood's air inlet, angled toward the oil collection box.

[0090] The first feedback sound collection device is primarily used to monitor system noise, vibration, or acoustic feedback signals in real time to optimize control strategies or perform fault diagnosis. In scenarios such as range hoods, industrial equipment, and smart homes, it can help implement active noise reduction, anomaly detection, or adaptive adjustment. It collects equipment operating noise (such as fans, motors, and airflow) to provide input signals for active noise reduction (ANC) or speed regulation.

[0091] The first feedback sound collection device includes at least one set of feedback signal microphones. The feedback signal microphone is a key component in active noise control, acoustic feedback suppression or closed-loop adjustment systems. It is used to collect environmental or equipment noise in real time and feed it back to the control system to generate a cancellation signal or make dynamic adjustments, capture target noise in real time, provide a reference signal for the active noise reduction system, and adjust the anti-phase sound wave signal.

[0092] In this embodiment, the first feedback sound collection device utilizes a set of feedback signal microphones (an array system consisting of two highly sensitive feedback signal microphones). These two feedback signal microphones are precisely arranged horizontally and coaxially, directly above the oil deflector plate at the range hood's air inlet. They are placed flush and evenly spaced. This arrangement effectively captures broadband noise signals from the air inlet area, where noise radiation is most concentrated during range hood operation. This microphone array configuration not only enables redundant noise signal collection but also improves the signal-to-noise ratio through phase analysis technology, providing a high-quality reference input signal for the subsequent active noise reduction algorithm.

[0093] In one embodiment, the feedback sound collecting device 1032 includes a second feedback sound collecting device; the second feedback sound collecting device is arranged above the air-conditioning outlet 1021 and is used to collect feedback sound at the air-conditioning outlet 1021.

[0094] The second feedback sound collection device is also used to monitor system noise, vibration or acoustic feedback signals in real time to optimize control strategies or perform fault diagnosis, and includes at least one set of feedback signal microphones.

[0095] In this embodiment, the second feedback sound collection device uses a set of feedback signal microphones (an array system consisting of two high-sensitivity feedback signal microphones). These two feedback signal microphones are precisely arranged in a symmetrical manner on the upper side of the air-conditioning outlet grille. They are arranged horizontally in parallel, which can effectively capture the medium and low-frequency airflow noise and high-frequency mechanical vibration noise generated in the air outlet area when the air conditioner is running. This microphone system supports real-time beamforming technology, can dynamically track changes in noise characteristics, and improve the signal-to-noise ratio through coherent signal processing, providing high-fidelity reference input for the subsequent active noise reduction control system. In addition, the array layout also takes into account the influence of the air flow from the air conditioner outlet, and is sealed with a sealing device to prevent the air flow from directly impacting the microphone diaphragm and causing signal distortion.

[0096] At the same time, for the noise generated by the environment, it is necessary to use the signal from the feedback signal microphone to feedback correct the entire process to improve the stability of the system's active noise reduction work.

[0097] In one embodiment, the range hood 101 also includes a guide plate 1014; the guide plate 1014 is above the range hood air inlet 1011 of the range hood 101; the sound output device 105 includes a first sound output device; the first sound output device is arranged between the guide plate 1014 and the range hood housing of the range hood 101, and is used to output the anti-phase sound wave signal.

[0098] Deflectors are key components in fluid control systems, used to optimize air and liquid flow paths. They are widely used in range hoods, air conditioning ducts, and automotive air intake systems. They converge inlet airflow, reducing vortex flow and thereby increasing air volume. Deflectors are located above the range hood's air inlet.

[0099] The first sound output device is the terminal execution unit of the active noise reduction control system, responsible for converting electrical signals into audible sound waves. It is used to output reverse sound wave signals, and its performance directly affects the sound quality, sound field coverage, and system interaction effect.

[0100] The first sound output device includes at least one set of speakers. The speakers are the core components of electroacoustic conversion. The speakers use the anti-phase signals generated by the speakers to interfere with the original sound wave signals, thereby canceling out the noise and preventing the spread of noise.

[0101] In this embodiment, the first sound output device utilizes an acoustic cancellation system consisting of two speakers, precisely phase-aligned within the narrow space between the range hood's air inlet deflector and the hood housing. Specifically, the speakers are installed behind the deflector's inclined straight section. The speakers are embedded in a recessed mounting arrangement, angled relative to the deflector's slope to ensure that the reverse sound waves effectively cover the noise radiation area of the air inlet. While ensuring that the cross-sectional area of the air inlet channel is not occupied, the deflector's inherent structural characteristics form a sound wave guidance channel, improving sound wave transmission efficiency. Based on the real-time output of the reverse sound wave signal, a precise acoustic cancellation field is formed in the range hood's air inlet area.

[0102] In one embodiment, the air conditioner 102 also includes an air conditioner outlet component 1023; the sound output device 105 includes a second sound output device; the second sound output device is arranged below the air conditioner outlet component 1023 and on the outer wall of the range hood 1012, and is used to output the anti-phase sound wave signal.

[0103] The air outlet component of the air conditioner is a key terminal in the air conditioning and refrigeration system, directly affecting airflow organization, thermal comfort, and noise levels. It is used to output the cool air generated by the air conditioner. The air inlet of the air conditioner outlet component is connected to the air outlet of the air conditioner's evaporative fan and is located in the center of the refrigeration range hood. The secondary sound output device is also the terminal execution unit of the active noise reduction control system, responsible for converting electrical signals into audible sound waves for outputting reverse sound wave signals.

[0104] In this embodiment, the second sound output device adopts an acoustic cancellation system consisting of two high-performance compact speakers. These two speakers (frequency response range 60Hz-10kHz) adopt a symmetrical layout and are respectively integrated in the left and right structural spaces of the range hood, located directly below the air inlet component of the air conditioner, for outputting the anti-phase sound wave signal. This position selection accurately utilizes the non-duct area between the side wall of the hood and the decorative panel in terms of spatial layout, does not occupy the original duct space, and does not affect the original ventilation performance at all; the structural design adopts concealed installation, and through the perfect covering of the external decorative panel of the range hood, the appearance of the whole machine is unchanged, maintaining the integrated aesthetic design of the product; this design scheme perfectly takes into account the structural reliability and appearance integrity of the product while ensuring noise reduction performance.

[0105] In one embodiment, the sound collecting device 103 and the sound output device 105 are sealed by a sealing device.

[0106] Sealing devices are key components that prevent fluid leakage and contaminant intrusion. They are used to prevent fluid (liquid or gas) leakage from mechanical joints and are widely used in industrial equipment, piping systems, aerospace, automotive, and marine applications. Sealing devices can be categorized into various types based on their operating principles and application scenarios.

[0107] In this embodiment, all sound collection devices (including signal collection microphones and feedback signal microphones) and sound output devices (including speakers) adopt a sealing device sealing protection design to prevent them from being contaminated by oil smoke and ensure long-term stable operation in an oil smoke environment.

[0108] An embodiment of the present invention provides a refrigerated range hood comprising: a range hood; an air conditioner; a sound collection device comprising a first sound source sound collection device, a second sound source sound collection device, a first feedback sound collection device, and a second feedback sound collection device, for collecting sound signals generated during the operation of the range hood and air conditioner; a control device for receiving the sound signals collected by the sound collection device and generating an inverted sound wave signal based on the sound signals; and a sound output device comprising a first sound output device and a second sound output device for receiving the inverted sound wave signal generated by the control device and outputting the inverted sound wave signal. The sound collection device monitors the operating noise of the range hood and air conditioner in real time, and the control device generates an inverted sound wave with an opposite phase, which is then used by the sound output device to cancel the noise. This cancels the combined noise of the range hood and air conditioner, avoiding noise amplification caused by the superposition of multiple devices. This active noise reduction method provides a more pronounced noise reduction effect, particularly for the low-frequency noise of the refrigerated range hood.

[0109] Reference Figure 5 , shows a flowchart of the steps of an active noise reduction method for a refrigeration range hood provided by an embodiment of the present invention, which is applied to any of the refrigeration range hoods described above, and the method includes:

[0110] Step 201, obtaining the sound of the sound source inside the refrigeration range hood;

[0111] Range hoods have four primary noise sources: the range hood fan, evaporator fan, condenser fan, and compressor. They also have three primary sound radiation paths: the range hood inlet, range hood outlet, and air conditioner outlet. These numerous noise sources and radiation paths contribute to the high noise levels of range hoods, with the range hood inlet and air conditioner outlet having the greatest impact on the user's ears.

[0112] Acquire the sound source sounds inside the refrigeration range hood, that is, obtain the sound source sounds generated when the range hood fan, evaporating fan, condensing fan and compressor are in operation, and collect the sound source sounds inside the air conditioner (evaporating fan, condensing fan and compressor) and inside the range hood (range hood fan) respectively through the first sound source sound collection device and the second sound source sound collection device.

[0113] Step 202, performing inversion processing on the sound source sound according to the sound source sound to obtain an initial inverted sound wave signal;

[0114] Active noise reduction is achieved by generating an anti-phase sound wave signal based on the sound source inside the range hood. This requires signal processing to invert the sound wave. The anti-phase sound is generated by reversing the phase of the original sound wave signal. When the two are superimposed, they produce destructive interference, reducing the noise energy.

[0115] According to the acquired sound sources inside the air conditioner (evaporator fan, condenser fan and compressor) and inside the range hood (range hood fan), the sound sources are processed inversely to obtain the initial inverse sound wave signal.

[0116] Step 203: Acquire feedback sounds from the range hood air inlet and the air conditioning outlet of the range hood;

[0117] Acquire feedback sound from the range hood, specifically the noise near the sound radiation path. The primary sound radiation paths are the range hood inlet, range hood outlet, and air conditioner outlet. Here, we primarily acquire feedback sound from the range hood inlet and air conditioner outlet. Both range hood noise and air conditioner noise are primarily low- to medium-frequency (less than 1kHz), with some high-frequency noise originating from the high-frequency electromagnetic sound of the compressor (above 5kHz).

[0118] To obtain the feedback sound at the range hood air inlet and the air conditioning outlet of the refrigeration range hood, it is necessary to collect sounds at different positions, collect the feedback sounds at the range hood air inlet and the air conditioning outlet through the first feedback sound collection device and the first feedback sound collection device, and optimize them in combination with the needs of the active noise reduction system.

[0119] Step 204, adjusting the parameters of the initial reverse phase sound wave signal according to the feedback sound to obtain a reverse phase sound wave signal;

[0120] Dynamically adjusting the anti-phase acoustic signal parameters based on feedback from the range hood inlet and air conditioner outlet to achieve optimal active noise cancellation (ANC) requires a combination of adaptive filtering algorithms and real-time feedback control. The anti-phase acoustic signal coefficients are updated in real time using the feedback signal to minimize residual noise energy.

[0121] Employing an intelligent active noise reduction control architecture based on multi-channel adaptive filtering, this system dynamically optimizes anti-phase sound wave parameters through real-time acoustic feedback, achieving coordinated noise reduction for both the range hood and the air conditioning outlets. By continuously learning the characteristics of the user's environment, the system automatically adapts to changes in the sound field under different installation conditions, maintaining optimal noise reduction performance.

[0122] Step 205: output the anti-phase sound wave signal to reduce the noise of the refrigeration range hood.

[0123] The speaker of the sound output device optimizes the inverted sound wave signal and reduces the noise of the refrigeration range hood, thereby realizing real-time active noise reduction of the refrigeration range hood.

[0124] In this embodiment, the signal collection microphone of the sound source sound collection device collects the sound source signal of the range hood and the sound source signal of the air conditioner. The sound source signal is transmitted to the controller as an input signal. The controller performs inversion processing on the input signal sound wave (that is, generates a signal with the same frequency and amplitude but opposite phase. This inverted signal can interfere with the original signal and cancel the original signal) to obtain an inverted sound wave signal with equal amplitude and opposite phase, and transmits this signal to the speaker of the sound output device. The speaker of the sound output device outputs the inverted sound wave signal. The feedback signal microphone of the feedback sound collection device collects the sound wave signals from the air inlet of the range hood and the air outlet of the air conditioner, and inputs them to the controller. The controller appropriately adjusts the parameters of the inverted sound wave signal according to the error value between the feedback signal noise value and the user's target noise value, and transmits the corrected inverted sound wave signal instruction to the speaker of the sound output device.

[0125] An embodiment of the present invention provides an active noise reduction method for a refrigeration range hood. The method comprises: obtaining sound from a sound source within the refrigeration range hood; performing inversion processing on the sound source sound based on the sound source sound to obtain an initial inverted sound wave signal; obtaining feedback sound from the hood air inlet and air conditioner air outlet of the refrigeration range hood; adjusting the parameters of the initial inverted sound wave signal based on the feedback sound to obtain an inverted sound wave signal; and outputting the inverted sound wave signal to reduce the noise of the refrigeration range hood. A sound collection device monitors the operating noise of the range hood and air conditioner in real time, a control device generates inverted sound waves with opposite phases, and a sound output device cancels the noise. The combined noise of the range hood and air conditioner is canceled to avoid noise amplification caused by the superposition of multiple devices. This active noise reduction method makes the noise reduction effect more significant, especially for the low-frequency noise of the refrigeration range hood.

[0126] Reference Figure 6 , which shows a flow chart of an active noise reduction method for a refrigeration range hood provided by an embodiment of the present invention.

[0127] The signal collection microphone of the sound source sound collection device collects the sound source signals inside the range hood and the sound source signals inside the air conditioner. The sound source signals are transmitted as input signals to the control device. The control device performs inversion processing on the sound source signals to obtain an inverted sound wave signal with equal amplitude and opposite phase, and transmits this signal to the speaker of the sound output device. The speaker of the sound output device outputs the inverted sound wave signal. The feedback signal microphone of the feedback sound collection device collects the feedback sound from the range hood air inlet and the air conditioner air outlet, and inputs it to the control device. The control device appropriately adjusts the parameters of the inverted sound wave signal and transmits the corrected inverted sound wave signal instruction to the speaker of the sound output device, thereby realizing active noise reduction of the refrigeration range hood. The noise reduction effect can be adjusted in real time by continuously adjusting the parameters of the inverted sound wave through the feedback sound from the range hood air inlet and the air conditioner air outlet collected by the feedback sound collection device.

[0128] It should be noted that for the sake of simplicity, the method embodiments are described as a series of actions. However, those skilled in the art should be aware that the embodiments of the present invention are not limited by the order of the actions described, because according to the embodiments of the present invention, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in this specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present invention.

[0129] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0130] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, apparatus, or computer program products. Thus, embodiments of the present invention may take the form of a fully hardware embodiment, a fully software embodiment, or an embodiment combining software and hardware. Furthermore, embodiments of the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0131] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the process in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0132] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0133] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable terminal device to implement the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0134] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0135] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or terminal device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or terminal device that includes the element.

[0136] The above is a detailed introduction to a refrigeration range hood and an active noise reduction method for a refrigeration range hood provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A refrigeration range hood, characterized in that: The refrigeration range hood comprises: Range hood; air conditioner; A sound collecting device, used to collect sound signals generated when the range hood and the air conditioner are in operation; a control device, configured to receive the sound signal collected by the sound collecting device and generate an anti-phase sound wave signal according to the sound signal; The sound output device is used to receive the reverse phase sound wave signal generated by the control device and output the reverse phase sound wave signal.

2. The refrigeration range hood according to claim 1, characterized in that: The range hood includes an air inlet; the air conditioner includes an air outlet; the sound signal includes a source sound and a feedback sound; the sound collection device includes a source sound collection device and a feedback sound collection device; The sound source sound collecting device is used to collect the sound source sounds inside the air conditioner and the range hood; The feedback sound collecting device is used to collect feedback sounds at the air inlet of the range hood and the air outlet of the air conditioner; The control device is used to receive the sound source sound and the feedback sound, and perform inversion processing on the sound source sound to obtain an initial inverted sound wave signal; and adjust the parameters of the initial inverted sound wave signal according to the feedback sound to obtain the inverted sound wave signal.

3. The refrigeration range hood according to claim 2, characterized in that: The range hood includes a range hood cabinet; the sound source sound collecting device includes a first sound source sound collecting device; the first sound source sound collecting device is arranged on the inner side wall of the range hood cabinet, and is used to collect the sound source sound inside the range hood cabinet.

4. The refrigeration range hood according to claim 2, characterized in that: The air conditioner includes a range hood outlet pipe; the sound source sound collecting device includes a second sound source sound collecting device; the second sound source sound collecting device is arranged on the outer side wall of the range hood outlet pipe, and is used to collect the sound source sound inside the air conditioner.

5. The refrigeration range hood according to claim 2, characterized in that: The range hood also includes an oil guide plate; the oil guide plate is close to the air inlet of the range hood; the feedback sound collection device includes a first feedback sound collection device; the first feedback sound collection device is arranged above the oil guide plate, and is used to collect feedback sound at the air inlet of the range hood.

6. The refrigeration range hood according to claim 2, characterized in that: The feedback sound collecting device includes a second feedback sound collecting device; the second feedback sound collecting device is arranged above the air outlet of the air conditioner and is used to collect the feedback sound at the air outlet of the air conditioner.

7. The refrigeration range hood according to claim 1, characterized in that: The range hood also includes a guide plate; the guide plate is above the range hood air inlet of the range hood; the sound output device includes a first sound output device; the first sound output device is arranged between the guide plate and the range hood housing of the range hood, and is used to output the anti-phase sound wave signal.

8. The refrigeration range hood according to claim 1, characterized in that: The air conditioner also includes an air-conditioning air outlet component; the sound output device includes a second sound output device; the second sound output device is arranged below the air-conditioning air outlet component and on the outer side wall of the range hood, and is used to output the anti-phase sound wave signal.

9. The refrigeration range hood according to claim 1, characterized in that: The sound collecting device and the sound output device are sealed by a sealing device.

10. An active noise reduction method for a refrigeration range hood, characterized in that: Applied to the refrigeration range hood according to any one of claims 1 to 9, the method comprises: Acquiring the sound of a sound source inside the refrigeration range hood; According to the sound source sound, performing inversion processing on the sound source sound to obtain an initial inverted phase sound wave signal; Acquiring feedback sounds from the range hood air inlet and the air conditioning outlet of the refrigeration range hood; Adjusting the parameters of the initial reverse phase sound wave signal according to the feedback sound to obtain a reverse phase sound wave signal; The anti-phase sound wave signal is output to reduce the noise of the refrigeration range hood.

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