Rice cooker noise reduction system and method, and rice cooker device

Abstract

The application relates to a rice cooker noise reduction system, method and rice cooker equipment, which comprises a composite sound-absorbing layer, a vibration frequency detection assembly and a power adjusting assembly; the composite sound-absorbing layer is embedded between the inner and outer walls of the inner container of the rice cooker; the vibration frequency detection assembly is arranged close to the inner container; the vibration frequency detection assembly is connected with the power adjusting assembly; the vibration frequency detection assembly detects the vibration frequency of the inner container, and according to the matching relationship between the vibration frequency and a preset vibration frequency threshold interval, a first signal and a second signal of different voltage levels are output; the power adjusting assembly switches the duty cycle waveform output state according to the received signal, so that the power of the heating assembly is reduced or restored. The application combines physical sound absorption and hardware noise reduction circuit, greatly reduces the noise of the rice cooker through the composite sound-absorbing layer, reduces the heating power only when the inner container is violently boiling, does not prolong the cooking time, and can effectively balance the noise reduction effect and the rice cooking quality.

Description

Technical Field

[0001] This application relates to the field of noise reduction technology for home appliances, and in particular to a noise reduction system, method and device for a rice cooker. Background Technology

[0002] When a rice cooker heats the rice to boiling point, a large number of bubbles are generated in the water inside the pot. As these bubbles rise and burst, they continuously impact the metal wall of the inner pot, causing the inner pot to vibrate regularly and radiate mid-to-high frequency boiling noise outwards. This is a major pain point for users during daily use.

[0003] Existing noise reduction solutions for rice cookers are mainly divided into two categories: purely physical buffering and fixed reduction of heating power. Purely physical buffering solutions often use silicone heat-insulating pads, relying solely on the elasticity of the silicone material to buffer the vibration of the inner pot. This approach cannot absorb the sound waves in the main noise frequency band of boiling, resulting in low noise reduction and limited overall noise reduction effect. Fixed reduction of heating power primarily reduces the intensity of boiling by lowering the heating power, but this directly prolongs the overall cooking time, easily leading to uneven heating of the rice and undercooked rice, thus failing to simultaneously achieve both noise reduction and cooking efficiency. Summary of the Invention

[0004] Therefore, it is necessary to provide a rice cooker noise reduction system, method, and rice cooker device that can balance noise reduction effect and cooking efficiency to address the above-mentioned technical problems.

[0005] In a first aspect, this application provides a rice cooker noise reduction system, including: a composite material sound-absorbing layer, a vibration frequency detection component, and a power adjustment component;

[0006] The composite material sound-absorbing layer is embedded between the inner and outer walls of the inner pot of the rice cooker; the vibration frequency detection component is set close to the inner pot; the vibration frequency detection component is connected to the power adjustment component;

[0007] The vibration frequency detection component is used to detect the vibration frequency of the inner liner. When the vibration frequency is within a preset vibration frequency threshold range, it outputs a first signal, and when the vibration frequency is not within the preset vibration frequency threshold range, it outputs a second signal; the voltage of the first signal is greater than the voltage of the second signal.

[0008] The power regulation component is used to output a first preset duty cycle signal when receiving a first signal, so as to reduce the output power of the heating component of the rice cooker, and to output a second preset duty cycle signal when receiving a second signal, so as to restore the normal output power of the heating component; the first preset duty cycle signal is less than the second preset duty cycle signal.

[0009] In one embodiment, the preset vibration frequency threshold range is the boiling noise peak frequency range; wherein, the boiling noise peak frequency range refers to the frequency range formed by floating the preset threshold around the boiling noise peak frequency; the boiling noise peak frequency refers to the inner pot vibration characteristic frequency corresponding to the maximum sound pressure level in the noise spectrum when the inner pot is subjected to continuous impact from the boiling bubbles inside the rice cooker to generate mechanical vibration and radiate noise outward.

[0010] In one embodiment, the vibration frequency detection component includes a piezoelectric sensor, an LC resonant circuit, and a comparator unit;

[0011] The piezoelectric sensor is placed close to the inner liner. The piezoelectric sensor collects the mechanical vibration of the inner liner, converts the mechanical vibration into an electrical signal, and sends the electrical signal to the LC resonant circuit.

[0012] The LC resonant circuit outputs a target electrical signal based on the proximity of the electrical signal output by the piezoelectric sensor to the resonant center frequency; wherein, the resonant center frequency is set to a preset vibration frequency threshold range.

[0013] The comparator unit determines the voltage of the target electrical signal output by the LC resonant circuit. If the voltage of the target electrical signal is greater than or equal to a preset voltage threshold, it outputs a first signal; if the voltage of the target electrical signal is less than the preset voltage threshold, it outputs a second signal.

[0014] In one embodiment, the power regulation component includes a timer and a switching device;

[0015] After receiving the first signal, the timer outputs a PWM waveform with a preset duty cycle; wherein the preset duty cycle is less than 100%.

[0016] The switching device switches the power supply circuit of the heating component on and off according to the PWM waveform, so that the output power of the heating component is reduced to the target power; the target power is less than the normal output power.

[0017] In one embodiment, the rice cooker noise reduction system further includes a time control component, which is connected to the vibration frequency detection component and the power adjustment component respectively.

[0018] The time control component is used to accumulate the number of times the first signal output by the vibration frequency detection component is triggered; when the accumulated number of triggers is greater than or equal to a preset threshold, the timer is set for a preset duration, and the power regulation component and the heating component are turned on, so that the power regulation component controls the heating component to maintain the target power operation; after the preset duration, the power regulation component and the heating component are turned off, so that the heating component can resume normal output power.

[0019] If the cumulative number of triggers is less than the preset threshold, disconnect the power regulation component and the heating component.

[0020] In one embodiment, the time control component includes a counter, a timer, and a relay; the timer is connected to both the counter and the relay; the relay is disposed between the power regulation component and the heating component.

[0021] The counter is used to accumulate the number of times the first signal is triggered;

[0022] The timer is used to keep track of a preset duration when the cumulative number of triggers is greater than or equal to a preset threshold.

[0023] The relay is used to activate when the timer starts timing and the timing duration is less than the preset duration, thereby turning on the power regulation component and the heating component, so that the power regulation component can control the heating component to maintain the target power operation;

[0024] Disconnect the power regulation component and heating component when the timer duration is greater than or equal to the preset duration, so that the heating component can resume normal output power.

[0025] In one embodiment, the composite sound-absorbing layer is a nanofiber-silicone composite layer; the nanofiber-silicone composite layer is integrally hot-pressed from a mixture of plant fibers in a first proportion and carbon nanotubes in a second proportion; the first proportion is greater than the second proportion; the sum of the first proportion and the second proportion is equal to 1.

[0026] In one embodiment, the first ratio is 70% and the second ratio is 30%.

[0027] Secondly, this application also provides a method for reducing noise in a rice cooker, applied to the rice cooker noise reduction system of the first aspect, the method comprising:

[0028] The vibration frequency detection component detects the vibration frequency of the inner liner. When the vibration frequency is within a preset vibration frequency threshold range, it outputs a first signal, and when the vibration frequency is not within the preset vibration frequency threshold range, it outputs a second signal. The voltage of the first signal is greater than the voltage of the second signal.

[0029] When the power regulating component receives the first signal, it outputs a first preset duty cycle signal to reduce the output power of the heating component of the rice cooker. When it receives the second signal, it outputs a second preset duty cycle signal to restore the normal output power of the heating component.

[0030] Thirdly, this application also provides a rice cooker device, including the rice cooker noise reduction system of the first aspect.

[0031] In summary, this application proposes a rice cooker noise reduction system, method, and rice cooker device, including: a composite material sound-absorbing layer, a vibration frequency detection component, and a power adjustment component; the composite material sound-absorbing layer is embedded between the inner and outer walls of the inner pot of the rice cooker; the vibration frequency detection component is set close to the inner pot; the vibration frequency detection component is connected to the power adjustment component; this application detects the vibration frequency of the inner pot through the vibration frequency detection component, and outputs a first signal and a second signal of different voltage levels according to the matching relationship between the vibration frequency and a preset vibration frequency threshold range; the power adjustment component switches the duty cycle waveform output state according to the received signal, so as to reduce or restore the power of the heating component. This application combines physical sound absorption and hardware noise reduction circuit, significantly reducing the noise of the rice cooker through the composite material sound-absorbing layer, and reducing the heating power only when the inner pot is boiling violently, without prolonging the cooking time, thus effectively balancing noise reduction effect and rice cooking quality. Attached Figure Description

[0032] Figure 1 This is a structural block diagram of a rice cooker noise reduction system in one embodiment;

[0033] Figure 2 This is a schematic diagram of the composite material sound-absorbing layer of a rice cooker noise reduction system in one embodiment;

[0034] Figure 3 This is a structural block diagram of a vibration frequency detection component in one embodiment;

[0035] Figure 4 This is a circuit diagram of a vibration frequency detection component in one embodiment;

[0036] Figure 5 This is a circuit diagram of the power regulation component in one embodiment;

[0037] Figure 6 This is a structural block diagram of the rice cooker noise reduction system in another embodiment;

[0038] Figure 7 This is a flowchart illustrating a method for noise reduction in a rice cooker in one embodiment;

[0039] Figure 8 This is an internal structural diagram of a computer device in one embodiment.

[0040] Summary of attached image labels:

[0041] Vibration frequency detection component-110, piezoelectric sensor-111, LC resonant circuit-112, comparator unit-113, power adjustment component-120, composite material sound-absorbing layer-130, time control component-140;

[0042] Heating component-210, inner liner-220. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0044] In one embodiment, reference Figure 1 and Figure 2 A noise reduction system for a rice cooker is provided, comprising: a composite material sound-absorbing layer 130, a vibration frequency detection component 110, and a power adjustment component 120. The composite material sound-absorbing layer 130 is embedded between the inner and outer walls of the inner pot 220 of the rice cooker. The vibration frequency detection component 110 is disposed in close contact with the inner pot 220. The vibration frequency detection component 110 is connected to the power adjustment component 120.

[0045] In this embodiment, as Figure 2 As shown, the composite material sound-absorbing layer 130 is integrally embedded between the inner and outer metal walls of the inner pot 220 of the rice cooker, closely fitting the double-layered walls of the inner pot 220 and vibrating synchronously with the inner pot 220. In actual scenarios, when the sound waves generated by the boiling bubbles in the inner pot 220 are transmitted to the inner pot 220 wall, they directly enter the interior of the composite material sound-absorbing layer 130 within the interlayer. The sound waves undergo multiple reflections and scatterings within the porous structure of the composite material sound-absorbing layer 130. The vibration of the sound waves causes the internal fiber materials of the sound-absorbing layer to rub against each other, converting the sound energy carried by the sound waves into heat energy for dissipation. This directly attenuates the boiling noise along the sound source propagation path, rather than relying solely on the elastic material to buffer the vibration transmission.

[0046] Specifically, in this embodiment, by setting a composite material sound-absorbing layer 130 along the path of noise radiation from the inner liner 220, the mid-to-high frequency noise generated by the boiling of the liquid inside the inner liner 220 can be directly absorbed, thereby reducing the loudness of the noise transmitted outward from a physical perspective.

[0047] The vibration frequency detection component 110 detects the vibration frequency of the inner liner 220. When the vibration frequency falls within a preset vibration frequency threshold range, it outputs a first signal; when the vibration frequency does not fall within the preset vibration frequency threshold range, it outputs a second signal. The voltage of the first signal is greater than the voltage of the second signal.

[0048] In this embodiment, the vibration frequency detection component 110 has functions such as vibration acquisition of the inner pot 220, frequency determination, and graded voltage signal output. It can capture the periodic mechanical vibration of the inner pot 220 caused by boiling impact in real time and convert the mechanical vibration frequency into a perceptible and assessable electrical signal. In practical applications, the vibration frequency detection component 110 continuously acquires the mechanical vibration of the inner pot 220 during operation and compares the acquired vibration parameters with a preset vibration frequency threshold range. When the vibration frequency of the inner pot 220 falls within the preset vibration frequency threshold range, it indicates that the inside of the rice cooker is in a high-noise boiling condition with violent bubbles impacting the inner pot 220. At this time, the vibration frequency detection component 110 outputs a first signal with a higher voltage. When the vibration frequency of the inner pot 220 deviates from the preset vibration frequency threshold range, it indicates that the inside of the pot is only in a low-noise condition such as preheating, slight bubbling, or simmering. The vibration frequency detection component 110 outputs a second signal with a lower voltage.

[0049] It should be noted that the vibration frequency detection component provided in this embodiment, as a front-end sensing unit, only outputs a high-level first signal to trigger noise reduction under real high-noise boiling conditions. This can effectively prevent irrelevant vibrations such as slight shaking of the inner tank 220 and water flow disturbance from falsely triggering power reduction, thus providing accurate operating condition judgment basis for the back-end power adjustment component 120.

[0050] When the power regulating component 120 receives the first signal, it outputs a first preset duty cycle signal to reduce the output power of the heating component 210 of the rice cooker. When it receives the second signal, it outputs a second preset duty cycle signal to restore the normal output power of the heating component 210.

[0051] In this embodiment, the power adjustment component 120 is a pulse width modulation (PWM) power control module, which can receive external level signals to switch drive waveforms with different duty cycles to control the average output power of the rice cooker heating component 210.

[0052] Specifically, the power adjustment component 120 provided in this embodiment receives the level signal output by the vibration frequency detection component 110 and matches it with a corresponding duty cycle output strategy. Upon receiving a high-level first signal, it outputs a first preset duty cycle signal with a lower duty cycle value. This relies on the low duty cycle waveform to periodically cut off the heating power supply, shortening the conduction time of the heating component 210 within a unit cycle, reducing the average output power of the heating component 210, weakening the intensity of boiling water in the pot, and reducing the vibration noise source of the inner pot 220. Upon receiving a low-level second signal, it outputs a second preset duty cycle signal with a 100% duty cycle. The heating component 210 remains continuously conducting and heating, maintaining the rated normal output power of the equipment and ensuring cooking efficiency. It should be noted that in this embodiment, the first preset duty cycle signal is a PWM signal with a lower duty cycle value. The second preset duty cycle signal is a PWM signal with a higher duty cycle value or a PWM signal with a 100% duty cycle.

[0053] Based on the above structure, this embodiment provides a rice cooker noise reduction system. It utilizes the combined effects of a composite material sound-absorbing layer 130 for physical sound absorption and noise reduction, a vibration frequency detection component 110 for precise identification of high-noise boiling conditions, and a power adjustment component 120 for dynamic adaptation and adjustment of heating power. The physical sound-absorbing layer first attenuates noise, while the electronic control module only reduces heating power to suppress vibration sources during noise peak periods, ensuring full-power heating throughout the low-noise phase. Through this structural setup and electronic control design, the boiling noise during the rice cooker's cooking process is significantly reduced, while the duration of power reduction is minimized. This effectively balances noise reduction requirements with cooking efficiency, overcoming the shortcomings of traditional methods that rely solely on physical noise reduction for poor results and rely on continuous power reduction to prolong cooking time.

[0054] In one embodiment, the preset vibration frequency threshold range is the boiling noise peak frequency range; wherein, the boiling noise peak frequency range refers to the frequency range formed by floating around the boiling noise peak frequency with the preset threshold as the center. The boiling noise peak frequency refers to the vibration characteristic frequency of the inner pot 220 corresponding to the maximum sound pressure level in the noise spectrum when the inner pot 220 is subjected to continuous impact from the boiling bubbles inside the rice cooker, generating mechanical vibration and radiating noise outward.

[0055] It should be noted that in real-world scenarios, during the boiling stage of cooking rice, the continuous impact of numerous air bubbles against the inner pot wall (220mm) generates continuous mechanical vibrations, and the noise levels corresponding to different vibration frequencies vary significantly. In this embodiment, the vibration frequency with the highest sound pressure level and the most jarring noise perceived by the user is the peak frequency of the boiling noise.

[0056] In practical applications, the actual vibration frequency of the inner liner 220 will drift slightly due to factors such as the amount of water and rice added, the mains voltage, and the assembly gap of the inner liner 220. In this embodiment, a tolerance range with fluctuations above and below the peak frequency is set as the preset vibration frequency threshold range. Only when the vibration of the inner liner 220 falls within the preset vibration frequency threshold range is it determined to be a high-noise and violent boiling condition, triggering the noise reduction logic.

[0057] In this embodiment, by setting a preset vibration frequency threshold range, low-noise conditions such as slight water flow disturbance, misalignment of the inner tank 220, and weak vibration during the preheating stage can be eliminated, thus avoiding a reduction in heating power due to low-noise conditions.

[0058] Based on the above numerical settings, this embodiment achieves precise differentiation of operating conditions by accurately defining the boiling-specific vibration range, reducing ineffective power reduction operations, and ensuring basic heating efficiency.

[0059] In one embodiment, such as Figure 3 As shown, the vibration frequency detection component 110 includes a piezoelectric sensor 111, an LC resonant circuit 112, and a comparator unit 113. The piezoelectric sensor 111 is disposed close to the inner liner 220. The piezoelectric sensor 111 collects the mechanical vibration of the inner liner 220, converts the mechanical vibration into an electrical signal, and transmits the electrical signal to the LC resonant circuit 112.

[0060] The LC resonant circuit 112 outputs a target electrical signal based on the proximity of the electrical signal output by the piezoelectric sensor 111 to the resonant center frequency. The resonant center frequency is set to a preset vibration frequency threshold range.

[0061] The comparator unit 113 performs voltage determination on the target electrical signal output by the LC resonant circuit 112. If the voltage of the target electrical signal is greater than or equal to a preset voltage threshold, it outputs a first signal; if the voltage of the target electrical signal is less than the preset voltage threshold, it outputs a second signal.

[0062] In this embodiment, the piezoelectric sensor 111 is attached to the outer wall of the inner liner 220 and uses the piezoelectric effect to convert the mechanical energy of the mechanical vibration of the inner liner 220 into an analog voltage signal, thereby realizing the circuit-transmittable conversion of the vibration signal.

[0063] In this embodiment, the resonant frequency band of the LC resonant circuit 112 matches the aforementioned boiling noise peak frequency range. When the input electrical signal frequency falls within this range, the circuit resonates and outputs a high-amplitude target electrical signal. If the input signal frequency deviates from the range, resonance fails, and a weak noise voltage signal is output. Figure 4Taking the provided vibration frequency detection circuit as an example, the vibration frequency detection circuit includes an LC resonant circuit 112 and an LM393 comparator. The LC resonant circuit 112 includes an inductor and a capacitor, and the values ​​of the inductor and capacitor can be set according to the resonant center frequency in the actual application scenario. For example, if the resonant center frequency is set to 45.0 Hz ± 0.5 Hz, the inductor of the LC resonant circuit 112 can be set to 100 millihenries (mH) ± 2.0%, and the capacitor to 10.0 microfarads (μF) ± 5.0%. The comparator threshold voltage of the LM393 comparator is 2.5 volts (V) ± 0.1V.

[0064] In this embodiment, the comparator unit 113 sets a fixed voltage threshold and, by distinguishing between high and low voltage output signals from the LC resonant circuit 112, stably outputs both high and low voltage signals. For example, if the fixed voltage threshold is 2.5V, then when the output signal of the LC resonant circuit 112 is greater than or equal to 2.5V, the LM393 comparator outputs a high-level first signal. When the output signal of the LC resonant circuit 112 is less than 2.5V, the LM393 comparator outputs a low-level second signal.

[0065] Based on the above system structure, the rice cooker noise reduction method provided in this embodiment, compared with the solution that only generally sets up a vibration detection module, adopts a three-level hardware architecture that combines piezoelectric acquisition, LC frequency screening and voltage comparison. It can automatically filter out noise vibration interference and only identify boiling peak vibration, which can greatly improve the identification accuracy of boiling conditions.

[0066] In one embodiment, the power regulation component 120 includes a timer and a switching device;

[0067] After receiving the first signal, the timer outputs a PWM waveform with a preset duty cycle; wherein the preset duty cycle is less than 100%.

[0068] The switching device switches the power supply circuit of the heating component 210 on and off according to the PWM waveform, so that the output power of the heating component 210 is reduced to the target power; the target power is less than the normal output power.

[0069] In this embodiment, as Figure 5 As shown, a 555 timer can be used as the timer, and a field-effect transistor (FET) VT1 can be used as the switching device. Specifically, the 555 timer includes two 10 kΩ ± 0.5% resistors, R1 and R2. The FET VT1 can be an IRF540N FET, which activates the coil of the heating element 210 when driven by a high level, thus heating the rice cooker.

[0070] Specifically, the timer provided in this embodiment is a waveform generator capable of generating continuously adjustable duty cycle PWM pulses. When the timer receives a first signal representing a high-noise operating condition, it continuously outputs a PWM drive waveform with a duty cycle below 100%. For example, a 555 timer can continuously output a PWM drive waveform with a duty cycle of 90% when it receives the first signal.

[0071] In this embodiment, the switching device is a high-speed controllable electronic switch, such as a field-effect transistor. The gate / control terminal of the switching device receives a PWM waveform and periodically turns the power supply circuit of the heating component 210 on and off according to the waveform level. Within a single waveform cycle, the heating component 210 is powered on and heats up only during the high-level period and powered off during the low-level period. The average heating power is proportional to the duty cycle of the PWM drive waveform, thereby reducing the heating power to a target power below the rated value, reducing the violent churning of the water inside the pot, and suppressing the vibration noise of the inner liner 220 from the sound source.

[0072] Based on the above system structure design, this embodiment clarifies the hardware composition and underlying principle of power regulation of the power regulation component 120, and clarifies that it relies on PWM chopping to achieve continuously adjustable power output, which is different from a single fixed-level power switching scheme. The power change is smooth during the noise reduction process, and there will be no problem of sudden rise or fall in heating temperature.

[0073] In one embodiment, the rice cooker noise reduction system further includes a time control component 140, which is connected to the vibration frequency detection component 110 and the power adjustment component 120, respectively.

[0074] The time control component 140 is used to accumulate the number of times the first signal output by the vibration frequency detection component 110 is triggered; when the accumulated number of triggers is greater than or equal to a preset threshold, the timer is set for a preset duration, and the power adjustment component 120 and the heating component 210 are turned on, so that the power adjustment component 120 controls the heating component 210 to maintain the target power operation; after the preset duration, the power adjustment component 120 and the heating component 210 are turned off, so that the heating component 210 returns to normal output power;

[0075] If the cumulative number of triggers is less than the preset threshold, disconnect the power regulation component 120 and the heating component 210.

[0076] In practical applications, a single, momentary boiling vibration can represent a brief, slight tumbling motion, without the need for continuous power reduction. In this embodiment, a time control component 140 is set up to continuously count the number of times the first signal is triggered. Only when boiling vibration is detected multiple times consecutively and the cumulative number reaches a preset threshold is it determined to be a continuous high-noise condition, and timed low-power noise reduction is initiated.

[0077] In this embodiment, the power regulation branch remains connected throughout the timing process to stably maintain the noise reduction power. After the preset timing duration is reached, the power regulation branch is automatically disconnected, and full-power heating is restored. If the number of vibration triggers does not exceed a preset threshold, the power regulation branch is directly disconnected, maintaining rated power throughout the process. The power regulation branch is the connection between the power regulation component 120 and the heating component 210.

[0078] Based on the above structural setup, this embodiment adds a time-limited noise reduction constraint to the rice cooker noise reduction system provided in the previous embodiment. This solves the defects of prolonged cooking time and undercooked rice caused by continuous power reduction, limits the total low-power operation time, and balances noise reduction effect and cooking efficiency.

[0079] In one embodiment, the time control component 140 includes a counter, a timer, and a relay. The timer is connected to both the counter and the relay; the relay is disposed between the power regulation component 120 and the heating component 210.

[0080] The counter is used to accumulate the number of times the first signal is triggered; the timer is used to time a preset duration when the accumulated number of triggers is greater than or equal to a preset threshold; the relay is used to activate when the timer starts timing and the timing duration is less than the preset duration, thereby connecting the power regulation component 120 and the heating component 210, so that the power regulation component 120 controls the heating component 210 to maintain the target power operation; and to deactivate when the timer's timing duration is greater than or equal to the preset duration, thereby disconnecting the power regulation component 120 and the heating component 210, so that the heating component 210 can resume normal output power.

[0081] In this embodiment, a counter is used to count the number of times the vibration detection component outputs the first signal in real time. Once a preset threshold is reached, a start level is output to trigger a timer to begin counting down. A relay is connected in series between the power regulation component 120 and the heating component 210, serving as a switching switch for the power regulation branch.

[0082] During the timing process, the relay is activated, connecting the power regulation component 120 to the heating circuit. After the timing is completed, the relay is released and disconnected, isolating the power regulation branch, and the heating component 210 is directly connected to the full power supply line.

[0083] Based on the above structural design, this embodiment clarifies the hardware composition of the time control component 140. It relies on the cooperation of three devices—counting, delay, and relay path switching—to realize time-limited noise reduction logic. The time control component 140 provided in this embodiment uses all general standard components, making the circuit construction simple, the hardware cost low, and facilitating the integration and mass production of the rice cooker motherboard.

[0084] In one embodiment, during a complete cooking cycle of the rice cooker, the relay of the time control component 140 is triggered only once for closing and opening control. That is, after the rice cooker starts the cooking program, if the cumulative number of triggers of the first signal output by the vibration frequency detection component 110 reaches a preset threshold, the counter outputs a trigger signal only once to start the timer, and the relay completes one activation operation. After the timer has counted for a preset duration, the relay performs only one deactivation operation, and the timer is not repeatedly started or the relay is activated during this cooking cycle.

[0085] This embodiment controls the rice cooking process by triggering the relay switch only once per cooking cycle. This avoids the extra electromagnetic noise and component wear caused by frequent relay switching, extends the lifespan of circuit components, ensures a stable cooking power curve, and prevents drastic temperature fluctuations inside the pot caused by multiple switching between high and low power, ensuring even heating of the rice. It also simplifies the main control logic and reduces program computation overhead.

[0086] In one embodiment, the composite sound-absorbing layer 130 is a nanofiber-silicone composite layer; the nanofiber-silicone composite layer is integrally hot-pressed from a mixture of plant fibers in a first proportion and carbon nanotubes in a second proportion; the first proportion is greater than the second proportion; the sum of the first proportion and the second proportion is equal to 1.

[0087] In this embodiment, plant fibers can form micron-sized microporous structures, primarily absorbing mid-frequency boiling noise. For example, plant fibers can form microporous structures of 50 micrometers (μm) to 500 μm to absorb mid-frequency noise in the 500Hz-1000Hz range. Carbon nanotubes form nanoscale fine channels, specifically dissipating high-frequency noise. For example, carbon nanotubes can form nanochannels of 1μm to 10μm to dissipate high-frequency noise in the 1000Hz-2000Hz range.

[0088] In this embodiment, plant fibers and carbon nanotubes are mixed with silicone and integrally hot-pressed with the inner liner 220. The sound-absorbing layer is seamlessly bonded to the inner liner 220 interlayer. After the sound waves are incident, the sound energy can be converted into heat energy and dissipated through the triple physical action of microporous scattering, fiber friction and structural resonance.

[0089] In this embodiment, the first proportion of plant fiber is greater than the second proportion of carbon nanotubes, ensuring the overall molding toughness and structural strength of the sound-absorbing layer and preventing cracking and detachment under high-temperature heating conditions. The sum of the two filler ratios is 1, achieving precise and controllable composition of the sound-absorbing material.

[0090] In one embodiment, the first proportion is 70%, and the second proportion is 30%. The 70% proportion of plant fiber provides sufficient micron-sized pores, covering the mainstream 500Hz~1000Hz mid-frequency noise band during rice cooking. The 30% carbon nanotubes supplement the nanoscale sound absorption channels, absorbing high-frequency noise from 1000Hz~2000Hz. With this ratio, the sound-absorbing layer achieves a balance in molding performance, high-temperature resistance, and full-frequency sound absorption effect, and significant noise attenuation can be achieved solely through the sound-absorbing layer.

[0091] Based on the above embodiments, the material, molding process, and component ratio of the composite sound-absorbing layer 130 are clearly defined. Unlike ordinary single-layer silicone buffer pads, it can achieve synchronous absorption of mid-to-high frequency noise in a wide frequency range, greatly improving the physical noise reduction capability.

[0092] In summary, this embodiment provides a rice cooker noise reduction system that achieves graded attenuation of cooking and boiling noise through the synergistic effect of physical sound absorption and noise reduction via composite material sound-absorbing layer and electronic power regulation. The overall comprehensive noise reduction can reach 15 dB. Specifically, the nanofiber-silicone composite sound-absorbing layer targets the main noise frequency band of cooking and boiling (500Hz~2000Hz) and achieves a basic noise reduction of 12 dB through a triple physical dissipation mechanism: First, the 5μm~50μm plant fiber micropores reflect and disperse the incident sound waves multiple times, attenuating the noise by approximately 4 dB. Second, under sound wave excitation, the plant fibers and carbon nanotubes undergo high-frequency relative friction, converting sound energy into heat energy loss, attenuating the noise by approximately 6 dB. Third, the sound-absorbing layer's own structure resonates with sound waves in the 480Hz~1900Hz frequency band, further absorbing and dissipating sound energy, attenuating the noise by approximately 2 dB. The sound-absorbing layer does not rely on rigid isolation and simple reflection to block noise, but rather directly dissipates sound waves at the energy level, achieving long-term physical noise reduction.

[0093] Based on this, after the vibration frequency detection component identifies the peak vibration of boiling, it activates the power regulation component to electronically reduce noise by 3dB: a 555 timer with 10KΩ resistors (tolerance ±0.5%) outputs a 90% duty cycle PWM waveform, which, through an IRF540N MOSFET, stably regulates the power of the heating coil to 90% ±0.5% of the rated power, with a power regulation response time of no more than 0.3 seconds. Reducing the heating power can suppress the violent churning and impact of the water inside the pot, weaken the intensity of the inner pot vibration sound source, and additionally reduce boiling noise by approximately 3dB.

[0094] By combining a physical sound-absorbing layer with electronic power adjustment, the noise reduction effect is enhanced, resulting in a combined reduction of 15dB in boiling noise during rice cooking. Furthermore, the electronic noise reduction only temporarily lowers the heating power, without extending the overall cooking time, effectively balancing excellent noise reduction with rice cooking quality.

[0095] In one embodiment, such as Figure 7This paper presents a method for noise reduction in a rice cooker, which can be applied to... Figure 1 Taking the noise reduction system of a rice cooker as an example, the explanation includes the following steps:

[0096] S701, the vibration frequency detection component detects the vibration frequency of the inner liner. When the vibration frequency falls within a preset vibration frequency threshold range, it outputs a first signal; when the vibration frequency does not fall within the preset vibration frequency threshold range, it outputs a second signal. The voltage of the first signal is greater than the voltage of the second signal.

[0097] S702, when the power regulating component receives the first signal, it outputs a first preset duty cycle signal to reduce the output power of the heating component of the rice cooker, and when it receives the second signal, it outputs a second preset duty cycle signal to restore the normal output power of the heating component.

[0098] It should be noted that the specific implementation of the rice cooker noise reduction method provided in this embodiment can be referred to the specific implementation of the aforementioned system embodiment, which will not be repeated here.

[0099] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0100] In one embodiment, a rice cooker device is also provided, including the rice cooker noise reduction system in the aforementioned system embodiment.

[0101] It should be noted that this embodiment does not limit the actual specifications of the rice cooker device, and any rice cooker device of any specification can be selected to be equipped with the rice cooker noise reduction system in the aforementioned embodiment.

[0102] In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 8As shown, the computer device includes a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input / output interface is used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, NFC (Near Field Communication), or other technologies. When the computer program is executed by the processor, it implements a noise reduction method for a rice cooker. The display unit is used to form a visually visible image and can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the computer device can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the computer device, or external keyboards, touchpads, or mice, etc.

[0103] Those skilled in the art will understand that Figure 8 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0104] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0105] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0106] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A noise reduction system for a rice cooker, characterized in that, include: Composite material sound-absorbing layer, vibration frequency detection component, and power regulation component; The composite material sound-absorbing layer is embedded between the inner and outer walls of the inner pot of the rice cooker; the vibration frequency detection component is set close to the inner pot; the vibration frequency detection component is connected to the power adjustment component; The vibration frequency detection component is used to detect the vibration frequency of the inner liner. When the vibration frequency is within a preset vibration frequency threshold range, it outputs a first signal, and when the vibration frequency is not within the preset vibration frequency threshold range, it outputs a second signal; the voltage of the first signal is greater than the voltage of the second signal. The power adjustment component is used to output a first preset duty cycle signal when receiving the first signal, so as to reduce the output power of the heating component of the rice cooker, and to output a second preset duty cycle signal when receiving the second signal, so as to restore the normal output power of the heating component. The first preset duty cycle signal is less than the second preset duty cycle signal.

2. The rice cooker noise reduction system according to claim 1, characterized in that, The preset vibration frequency threshold range is the boiling noise peak frequency range; wherein, the boiling noise peak frequency range refers to the frequency range formed by floating the preset threshold around the boiling noise peak frequency; the boiling noise peak frequency refers to the inner pot vibration characteristic frequency corresponding to the maximum sound pressure level in the noise spectrum when the inner pot is subjected to continuous impact from the boiling bubbles inside the rice cooker to generate mechanical vibration and radiate noise outward.

3. The rice cooker noise reduction system according to claim 1, characterized in that, The vibration frequency detection component includes a piezoelectric sensor, an LC resonant circuit, and a comparator unit. The piezoelectric sensor is disposed in close contact with the inner liner. The piezoelectric sensor collects the mechanical vibration of the inner liner, converts the mechanical vibration into an electrical signal, and transmits the electrical signal to the LC resonant circuit. The LC resonant circuit outputs a target electrical signal based on the proximity of the electrical signal output by the piezoelectric sensor to the resonant center frequency; wherein the resonant center frequency is set to the preset vibration frequency threshold range. The comparator unit performs voltage determination on the target electrical signal output by the LC resonant circuit. If the voltage of the target electrical signal is greater than or equal to a preset voltage threshold, it outputs the first signal; if the voltage of the target electrical signal is less than the preset voltage threshold, it outputs the second signal.

4. The rice cooker noise reduction system according to claim 1, characterized in that, The power regulation component includes a timer and a switching device; After receiving the first signal, the timer outputs a PWM waveform with a preset duty cycle; wherein the preset duty cycle is less than 100%. The switching device switches the power supply circuit of the heating component on and off according to the PWM waveform, so that the output power of the heating component is reduced to the target power; the target power is less than the normal output power.

5. The rice cooker noise reduction system according to claim 4, characterized in that, Also includes: A time control component, which is connected to the vibration frequency detection component and the power adjustment component respectively; The time control component is used to accumulate the number of times the first signal is triggered by the vibration frequency detection component; when the accumulated number of triggers is greater than or equal to a preset number threshold, the time is set for a preset duration, and the power adjustment component and the heating component are turned on, so that the heating component is controlled by the power adjustment component to maintain the target power operation; After a preset time, disconnect the power regulation component and the heating component to allow the heating component to resume normal output power. If the cumulative number of triggers is less than the preset threshold, disconnect the power regulation component and the heating component.

6. The system according to claim 5, characterized in that, The time control component includes a counter, a timer, and a relay; the timer is connected to both the counter and the relay; the relay is disposed between the power regulation component and the heating component. The counter is used to accumulate the number of times the first signal is triggered; The timer is used to time a preset duration when the cumulative number of triggers is greater than or equal to a preset threshold number. The relay is used to activate when the timer starts timing and the timing duration is less than a preset duration, thereby connecting the power regulation component and the heating component, so that the power regulation component can control the heating component to maintain the target power operation; If the timer's duration is greater than or equal to a preset duration, the power regulation component and the heating component will be disconnected to allow the heating component to resume normal output power.

7. The system according to claim 1, characterized in that, The sound-absorbing layer of the composite material is a nanofiber-silicone composite layer; the nanofiber-silicone composite layer is integrally hot-pressed by mixing plant fibers in a first proportion and carbon nanotubes in a second proportion with silicone; the first proportion is greater than the second proportion; the sum of the first proportion and the second proportion is equal to 1.

8. The system according to claim 7, characterized in that, The first ratio is 70%, and the second ratio is 30%.

9. A method for reducing noise in a rice cooker, characterized in that, The method, applied to the rice cooker noise reduction system according to any one of claims 1-8, comprises: The vibration frequency detection component detects the vibration frequency of the inner liner. When the vibration frequency falls within a preset vibration frequency threshold range, it outputs a first signal, and when the vibration frequency does not fall within the preset vibration frequency threshold range, it outputs a second signal. The voltage of the first signal is greater than the voltage of the second signal. When the power adjustment component receives the first signal, it outputs a first preset duty cycle signal to reduce the output power of the heating component of the rice cooker. When it receives the second signal, it outputs a second preset duty cycle signal to restore the normal output power of the heating component.

10. An electric rice cooker, characterized in that, Including the rice cooker noise reduction system according to any one of claims 1-8.

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