Refrigerator and noise reduction method thereof

Abstract

The application discloses a refrigerator and a noise reduction method thereof. The method comprises the following steps: acquiring a noise parameter value detected by a noise parameter detection device in response to a low-noise operation instruction, determining a noise parameter frequency band with the largest noise contribution value as a target frequency band; when the current optimal noise reduction frequency band of the muffler obtained does not match the target frequency band, adjusting the noise reduction parameter of the muffler by a preset step size until the noise parameter value in the target frequency band is reduced by an amount that meets a preset adjustment end condition, thereby achieving fast and accurate noise reduction of the refrigerator, not affecting the refrigeration effect of the refrigerator, and improving user experience.

Description

Technical Field

[0001] This invention relates to the field of refrigerator technology, and more particularly to a refrigerator and a method for reducing refrigerator noise. Background Technology

[0002] With the advancement of technology and economic development, refrigerators have become widely used in people's lives. However, refrigerators generate considerable noise during operation, affecting the user experience. Current products typically reduce noise by lowering the speed of the fan or compressor, but this noise reduction method is detrimental to the refrigerator's cooling performance. Summary of the Invention

[0003] The purpose of this invention is to provide a refrigerator and a refrigerator noise reduction method. By first determining the frequency band with the largest contribution value in the noise parameter values, and then making corresponding adjustments to the noise reduction parameters of the muffler, the refrigerator can achieve rapid and accurate noise reduction without affecting the refrigerator's cooling effect.

[0004] To achieve the above objectives, embodiments of the present invention provide a refrigerator, comprising:

[0005] A muffler, located inside the refrigerator, is used to reduce refrigerator noise; the muffler's noise reduction parameters are adjustable.

[0006] A noise parameter detection device is installed on the refrigerator to detect noise parameter values;

[0007] Controller, used for:

[0008] In response to the low-noise operation command, the noise parameter frequency band with the largest noise contribution value is determined based on the noise parameter value detected by the noise parameter detection device, and used as the target frequency band;

[0009] When the current optimal noise reduction frequency band of the silencer does not match the target frequency band, the silencer is controlled to adjust the noise reduction parameters by a preset step size until the noise parameter value in the target frequency band meets the preset adjustment termination condition.

[0010] As an improvement to the above solution, the refrigerator also includes a whole-machine noise parameter detection device, which is installed on the refrigerator and used to detect the whole-machine noise parameter value;

[0011] The noise parameter detection device is a duct noise parameter detection device, which is installed on the duct of the refrigerator, and the noise parameter value is the duct noise parameter value.

[0012] The controller is also used for:

[0013] After adjusting the noise reduction parameters, if the current noise reduction parameter value detected by the whole machine noise parameter detection device is less than or equal to the preset target noise reduction parameter value, the current noise reduction parameter of the silencer and the current speed of the refrigerator fan are recorded to establish the correspondence between the noise reduction parameters and the fan speed.

[0014] After adjusting the noise reduction parameters, if the current overall noise parameter value is greater than the target overall noise parameter value, the fan speed is reduced by a preset speed reduction amount, and the noise reduction parameters of the silencer are readjusted.

[0015] As an improvement to the above solution, the refrigerator further includes:

[0016] The refrigerant circuit circulates refrigerant sequentially through a compressor, condenser, pressure reducer, and evaporator to provide cooling capacity to the refrigerator's storage compartment.

[0017] A bottom-cooled fan is located near the condenser to dissipate heat from the condenser;

[0018] The fan is a storage room fan, used to deliver the cooling energy into the storage room;

[0019] The controller is also used for:

[0020] After adjusting the noise reduction parameters, before reducing the fan speed by a preset reduction amount, if the current overall noise parameter value is greater than the target overall noise parameter value, the speed of the bottom cooling fan is reduced by a preset bottom cooling step size until the current overall noise parameter value is less than or equal to the target overall noise parameter value, or the refrigerator energy consumption does not meet the preset low energy consumption condition; wherein, the preset low energy consumption condition is that the refrigerator energy consumption after the bottom cooling fan speed is reduced is less than or equal to the refrigerator energy consumption before the bottom cooling fan speed is reduced;

[0021] When the refrigerator's energy consumption does not meet the preset low energy consumption condition, the bottom cooling fan is controlled to increase its speed by the preset bottom cooling step.

[0022] As an improvement to the above solution, the silencer is a micro-perforated plate silencer, the silencer parameter is the cavity depth, and the noise parameter value is the noise value, vibration acceleration, or sound quality.

[0023] The controller is also used for:

[0024] When the current optimal silencing frequency band is greater than the target frequency band, the micro-perforated plate silencer is controlled to gradually increase the cavity depth by a first preset step size until the preset adjustment end condition is met.

[0025] When the current optimal silencing frequency band is less than the target frequency band, the micro-perforated plate silencer is controlled to gradually reduce the cavity depth by the first preset step size until the preset adjustment end condition is met.

[0026] As an improvement to the above solution, the silencer is a thin-film acoustic metamaterial silencer, the silencer parameter is the thin-film tension, and the noise parameter value is the noise value, vibration acceleration, or sound quality.

[0027] The controller is also used for:

[0028] When the current optimal silencing frequency band is greater than the target frequency band, the thin-film acoustic metamaterial silencing device is controlled to gradually increase the film tension by a second preset step size until the preset adjustment end condition is met.

[0029] When the current optimal silencing frequency band is less than the target frequency band, the thin-film acoustic metamaterial silencer is controlled to gradually reduce the film tension by the second preset step size until the preset adjustment end condition is met.

[0030] As an improvement to the above scheme, the preset adjustment termination condition is:

[0031] The reduction in noise parameters in the current target frequency band is greater than or equal to the preset target reduction.

[0032] Alternatively, the reduction in noise parameters of the current target frequency band is less than the preset target reduction, greater than the reduction in noise parameters of the left adjacent frequency band, and greater than the reduction in noise parameters of the right adjacent frequency band.

[0033] Wherein, the reduction amount of noise parameter in the current target frequency band is the difference between the noise parameter value before and after the adjustment of the muffler's silencing parameter and the noise contribution value in the target frequency band; the reduction amount of noise parameter in the left adjacent frequency band is the difference between the noise parameter value before and after the adjustment of the muffler's silencing parameter and the noise contribution value in the left adjacent frequency band; and the reduction amount of noise parameter in the right adjacent frequency band is the difference between the noise parameter value before and after the adjustment of the muffler's silencing parameter and the noise contribution value in the right adjacent frequency band.

[0034] As an improvement to the above solution, the controller is also used for:

[0035] Set test values ​​for noise parameters in different frequency bands;

[0036] For each frequency band, the noise reduction parameters of the muffler are adjusted, and the noise reduction parameter with the smallest noise reduction value after being reduced by the muffler is selected. The correspondence between the noise reduction parameter and the optimal noise reduction frequency band is established.

[0037] Obtain the current noise reduction parameters of the muffler, and determine the current optimal noise reduction frequency band based on the correspondence between the noise reduction parameters and the optimal noise reduction frequency band.

[0038] As an improvement to the above solution, the controller is also used for:

[0039] When the current optimal silencing frequency band matches the target frequency, the silencer is controlled to maintain the current silencing parameters.

[0040] As an improvement to the above solution, the whole machine noise parameter detection device is a whole machine noise sensor, the whole machine noise parameter value is the whole machine noise value, and the target whole machine noise parameter value is the target whole machine noise value;

[0041] The controller is also used for:

[0042] After the refrigerator restarts, based on the correspondence between each noise reduction parameter and the fan speed, when the real-time overall noise value detected by the overall noise sensor is greater than the target overall noise value, the correspondence between the noise reduction parameter and the fan speed is adjusted.

[0043] To achieve the above objectives, embodiments of the present invention also provide a refrigerator noise reduction method, comprising:

[0044] The noise parameter frequency band with the largest noise contribution value is determined based on the noise parameter values ​​detected by the noise parameter detection device, and is used as the target frequency band; wherein, the noise parameter detection device is installed on the refrigerator.

[0045] When the current optimal noise reduction frequency band of the silencer does not match the target frequency band, the silencer is controlled to adjust the noise reduction parameters by a preset step size until the noise parameter value in the target frequency band meets the preset adjustment termination condition; wherein, the silencer is located inside the refrigerator.

[0046] Compared to existing technologies, the refrigerator and refrigerator noise reduction method disclosed in this invention, in response to a low-noise operation command, acquires the noise parameter values ​​detected by a noise parameter detection device to determine the noise parameter frequency band with the largest noise contribution as the target frequency band. When the acquired current optimal silencing frequency band of the muffler does not match the target frequency band, the muffler is controlled to adjust the silencing parameters by a preset step size until the noise parameter reduction in the target frequency band meets a preset adjustment termination condition. Therefore, this invention can achieve rapid and accurate noise reduction in the refrigerator without affecting the cooling effect, thus improving the user experience, by first determining the frequency band with the largest noise contribution and then specifically adjusting the silencing parameters of the muffler. Attached Figure Description

[0047] Figure 1 This is a perspective view of the refrigerator provided in an embodiment of the present invention;

[0048] Figure 2 This is a perspective view of the refrigerator door provided in an embodiment of the present invention;

[0049] Figure 3 This is a schematic diagram of the refrigeration system provided in an embodiment of the present invention;

[0050] Figure 4 This is a schematic diagram of the refrigerant flow direction during refrigeration provided in an embodiment of the present invention;

[0051] Figure 5 This is a schematic diagram of the airflow direction during refrigeration provided in an embodiment of the present invention;

[0052] Figure 6 This is a schematic diagram of the structure of a communication system provided in an embodiment of the present invention;

[0053] Figure 7 This is a first working flowchart of the controller provided in an embodiment of the present invention;

[0054] Figure 8 This is a schematic diagram of a refrigerator noise value waveform provided in an embodiment of the present invention;

[0055] Figure 9 This is a second workflow diagram of the controller provided in an embodiment of the present invention;

[0056] Figure 10 This is a third workflow diagram of the controller provided in an embodiment of the present invention;

[0057] Figure 11 This is a flowchart of a refrigerator noise reduction method provided in an embodiment of the present invention.

[0058] Among them, 100 is the cabinet, 200 is the door, 210 is the outer shell of the door, 220 is the inner liner of the door, 230 is the upper cover, and 240 is the lower cover; 1 is the compressor, 2 is the condenser, 3 is the anti-condensation pipe, 4 is the dryer filter, 5 is the pressure reducer, 6 is the evaporator, and 7 is the gas-liquid separator; 11 is the refrigerator compartment, 12 is the freezer compartment, 13 is the air duct, 14 is the fan, 300 is the refrigerator, 400 is the cloud server, 500 is the router, and 600 is the client. Detailed Implementation

[0059] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0060] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0061] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0062] See Figure 1 , Figure 1 This is a perspective view of a refrigerator provided in an embodiment of the present invention. The refrigerator in this embodiment has an approximately cuboid shape and includes a cabinet 100 defining a storage space and multiple doors 200 disposed at the opening of the cabinet 100. See also... Figure 2 As shown, the door 200 includes a door outer shell 210 located outside the cabinet 100, a door inner liner 220 located inside the cabinet 100, an upper end cover 230, a lower end cover 240, and an insulation layer located between the door outer shell 210, the door inner liner 220, the upper end cover 230, and the lower end cover 240; typically, the insulation layer is filled with foam material. The cabinet 100 has a chamber, which includes a component storage chamber for placing refrigerator components, such as compressors and fans, and a storage space for storing food, medicine, etc. The component storage chamber also houses a muffler with adjustable noise reduction parameters (not shown in the figure). Different noise reduction parameters have different noise reduction effects on different frequency bands. The refrigerator in this embodiment includes a refrigeration system, see [link to relevant documentation]. Figure 3The diagram shows the structure of the refrigeration system. The refrigeration system is located in the component storage cavity and includes a compressor, evaporator, pressure reducer, and condenser. The refrigeration system is essentially a refrigerant circuit. The refrigerant circulates sequentially through the compressor, condenser, pressure reducer, and evaporator to provide cooling to the refrigerator's storage compartments. The compressor provides power for the refrigeration cycle. The storage space can be divided into multiple compartments, which, depending on their purpose, can be configured as refrigerator compartments, freezer compartments, or variable temperature compartments (also known as crisper compartments). Each compartment corresponds to one or more doors, for example, in... Figure 1 The upper storage compartment features double doors. These doors can be pivotally mounted at the opening of the cabinet or can open like drawers for drawer-style storage.

[0063] Furthermore, the refrigerator is also equipped with a noise parameter detection device (not shown in the figure) to detect the noise parameter values ​​of the refrigerator.

[0064] See Figure 3 , Figure 3 This is a schematic diagram of the refrigeration system in a refrigerator provided in an embodiment of the present invention. The refrigeration system includes a compressor 1, a condenser 2, an anti-condensation pipe 3, a dryer filter 4, a pressure reducer 5, an evaporator 6, and a gas-liquid separator 7. The working process of the refrigeration system includes a compression process, a condensation process, a throttling process, and an evaporation process.

[0065] Among them, combined Figure 3 The compression process is as follows: When the refrigerator power cord is plugged in and the thermostat contacts are closed, compressor 1 starts working. Low-temperature, low-pressure refrigerant is drawn into compressor 1 and compressed into high-temperature, high-pressure superheated gas in the cylinder of compressor 1 before being discharged into condenser 2. The condensation process is as follows: The high-temperature, high-pressure refrigerant gas dissipates heat through condenser 2, and its temperature continuously decreases, gradually cooling into room-temperature, high-pressure saturated vapor, and further cooling into saturated liquid. The temperature no longer decreases; this temperature is called the condensation temperature. The pressure of the refrigerant remains almost constant throughout the condensation process. The throttling process is as follows: After condensation, the refrigerant... After the saturated liquid refrigerant is filtered to remove moisture and impurities by the dryer filter 4, it flows into the pressure reducer 5 (e.g., a capillary tube). There, it undergoes throttling and pressure reduction, transforming the refrigerant into a low-pressure, room-temperature wet vapor. The evaporation process involves the room-temperature, low-pressure wet vapor absorbing heat and vaporizing within the evaporator 6. This not only lowers the temperature of the evaporator and its surroundings but also transforms the refrigerant into a low-temperature, low-pressure gas. The refrigerant exiting the evaporator 6 passes through the gas-liquid separator 7 and returns to the compressor 1, repeating the above process. This transfers heat from inside the refrigerator to the outside air, achieving the purpose of refrigeration. For further information on the refrigerant flow, please refer to [link to relevant documentation]. Figure 4 As shown.

[0066] See Figure 5As shown, the refrigerator also includes a fan 14, located in the refrigerator's air duct 13. When the fan 14 operates, air continuously enters the fins of the evaporator 6 for heat exchange. Simultaneously, the air cooled by the evaporator 6 after absorbing heat is sent through the air duct 13 to the refrigerator compartment 11 and the freezer compartment 12. By utilizing air vents corresponding to the storage compartments, continuous air circulation within the storage compartments is achieved, thus lowering the temperature. The refrigerator compartment's inner wall features refrigerator air vents, including refrigerator return air vents and refrigerator supply air vents, used to create a cold air circulation to provide cooling to the refrigerator compartment. Similarly, the freezer compartment also has freezer air vents (freezer supply air vents and freezer return air vents). When the fan rotates, airflow is generated. The cooling energy generated by the evaporator is blown by the fan to the supply air vent, entering the storage compartment corresponding to the supply air vent, providing cooling to the storage compartment. The air in the storage compartment is squeezed out, flows out from the corresponding air outlet, and is carried back to the evaporator for heat exchange, completing one airflow cycle.

[0067] Specifically, in this embodiment of the invention, the refrigerator further includes a controller, which is configured to: respond to a low-noise operation command, determine the noise parameter frequency band with the largest noise contribution value based on the noise parameter value detected by the noise parameter detection device, and use it as a target frequency band; when the current optimal silencing frequency band of the silencer does not match the target frequency band, control the silencer to adjust the silencing parameter by a preset step size until the noise parameter value in the target frequency band is reduced by a preset adjustment termination condition.

[0068] It is worth noting that the noise reduction method provided in this embodiment of the invention is applicable to the noise reduction needs of the refrigerator in any mode, such as the defrost recovery period, first power-on, and stable operation modes. Based on the noise-related attributes of different modes, the noise reduction method provided in this embodiment of the invention is applied to different operating modes, and the silencing parameters of the silencer corresponding to each operating mode can then be obtained. Therefore, the operating mode of the refrigerator is not limited here.

[0069] For example, the low-noise operation command can be pre-set, automatically triggered during a preset nighttime period, such as 8 PM to 8 AM. Alternatively, a noise reduction button can be installed on the refrigerator, and the low-noise operation command can be triggered by inputting a button signal. It can also be triggered by inputting a touchscreen signal on the refrigerator's display screen. Alternatively, it can be input via a client. See [link to relevant documentation]. Figure 6 , Figure 6This is a schematic diagram of a communication system provided in an embodiment of the present invention. A refrigerator 300 establishes a data connection with a client 600 through a router 500 or a cloud server 400. When the refrigerator 300 and the client 600 communicate through the router 500, the refrigerator 300 and the client 600 are relatively close, allowing the user to input low-noise operation commands through the client 600 from the living room or bedroom. When the refrigerator 300 and the client 600 communicate through the cloud server 400, the refrigerator 300 and the client 600 are relatively far apart, allowing the user to interact with the refrigerator 300 via an app installed on the client 600, and also enabling remote control of the refrigerator 300. Therefore, there are multiple ways to trigger low-noise operation commands, which are not limited here.

[0070] For example, see Figure 7 , Figure 7 This is a first flowchart of the controller provided in an embodiment of the present invention, wherein the controller is used to execute steps S11 to S15:

[0071] S11. In response to the low-noise operation command, determine the noise parameter frequency band with the largest noise contribution value based on the noise parameter value detected by the noise parameter detection device, and use it as the target frequency band, and then proceed to step S12.

[0072] Specifically, the noise generated by a refrigerator is not of a single frequency; there are frequency bands that contribute significantly to the noise. In different operating modes of the refrigerator, the operating conditions of components such as the fan are different, and the frequency band with the largest noise contribution is also different. By analyzing the contribution of noise parameter values, the frequency band with the largest noise parameter contribution is determined as the target frequency band, which is used to guide the subsequent adjustment of the silencer's silencing parameters, so as to achieve rapid and accurate reduction of refrigerator noise.

[0073] S12. Determine whether the current optimal silencing frequency band of the acquired muffler matches the target frequency band. If yes, proceed to step S13; otherwise, proceed to step S15.

[0074] S13. Control the muffler to adjust the silencing parameters in a preset step size, and then proceed to step S14.

[0075] Specifically, the noise reduction effect of a muffler varies depending on the noise reduction parameters of the muffler. Therefore, by obtaining the current optimal noise reduction frequency band of the muffler and comparing it with the target frequency band, if they do not match, it means that the current noise reduction effect of the muffler has not reached the optimal level. In this case, the noise reduction parameters of the muffler are adjusted to optimize the noise reduction effect of the muffler.

[0076] It is worth noting that the specific value of the preset step size is set by the manufacturer according to the actual situation, and is not limited here.

[0077] S14. Determine whether the noise parameter value in the target frequency band has a reduction amount that meets the preset adjustment end condition. If yes, proceed to step S15; otherwise, return to step S13.

[0078] Specifically, a round of adjustment of the muffler's noise reduction parameters often involves multiple adjustments. After each adjustment, it is necessary to evaluate the noise reduction effect of the muffler on the target frequency band. If the noise reduction in the target frequency band meets the preset adjustment end condition, it indicates that the muffler's noise reduction parameters have achieved a relatively good level of noise reduction for the refrigerator. If the noise reduction in the target frequency band does not meet the preset adjustment end condition, it indicates that the muffler's noise reduction parameters have not achieved the expected noise reduction effect for the refrigerator. Therefore, the process returns to step S13 to adjust the muffler's noise reduction parameters again.

[0079] S15. Control the muffler to maintain the current muffler parameters.

[0080] Specifically, if the noise parameter reduction in the target frequency band meets the preset adjustment termination condition, it means that the muffler's noise reduction parameter has achieved the expected noise reduction effect on the refrigerator. Therefore, the muffler is controlled to maintain the current noise reduction parameter in order to reduce the noise of the refrigerator.

[0081] Compared with existing technologies, the embodiments of the present invention can analyze noise parameter values ​​to determine the frequency band of the noise parameter with the largest noise contribution as the target frequency band. The target frequency band is compared with the current optimal silencing frequency band of the muffler. When the comparison result is mismatched, the muffler is controlled to adjust the silencing parameters by a preset step size until the noise parameter value in the target frequency band meets the preset adjustment end condition. The targeted adjustment of the silencing parameters can clearly define the adjustment direction of the muffler, achieve the purpose of fast and accurate noise reduction, and does not affect the cooling effect of the refrigerator, thus improving the user experience.

[0082] In one embodiment, the controller is further configured to: the noise parameter detection device is an air duct noise parameter detection device, disposed on the air duct of the refrigerator, and the noise parameter value is the air duct noise parameter value;

[0083] Specifically, see Figure 8 , Figure 8This is a waveform diagram of refrigerator noise values ​​provided in an embodiment of the present invention. The horizontal axis represents time, and the vertical axis represents noise value. There are two curves in the figure. The upper curve represents the overall noise value of the refrigerator, and the lower curve represents the noise value of a single fan. The noise value of a single fan is approximately 32.55 dB, and the overall noise value is 36.99 dB. It can be seen that the fan noise accounts for a large proportion. Therefore, in this embodiment, a duct noise parameter detection device (not shown in the figure) is installed on the refrigerator's air duct to target the fan noise reduction, which can effectively reduce the noise of the refrigerator.

[0084] In one embodiment, the refrigerator further includes a whole-machine noise parameter detection device disposed on the refrigerator for detecting the whole-machine noise parameter value; the controller is further configured to: after adjusting the silencing parameters, if the current whole-machine noise parameter value detected by the whole-machine noise parameter detection device is less than or equal to a preset target whole-machine noise parameter value, record the current silencing parameters of the silencer and the current speed of the refrigerator fan to establish a correspondence between the silencing parameters and the fan speed; after adjusting the silencing parameters, if the current whole-machine noise parameter value is greater than the target whole-machine noise parameter value, reduce the speed of the fan by a preset speed reduction amount and readjust the silencing parameters of the silencer.

[0085] Specifically, after targeted noise reduction of the fan, the overall noise of the refrigerator is analyzed. If the current overall noise parameter value of the refrigerator is less than or equal to the preset target overall noise parameter value, it means that the overall noise reduction effect of the refrigerator has achieved the expected effect. Therefore, the adjusted noise reduction parameters and fan speed can be recorded to establish a correspondence for subsequent noise reduction processing. If the current overall noise parameter value of the refrigerator is greater than the target overall noise parameter value, it means that the current fan speed is too high. Even if the noise reduction parameters of the silencer are matched and adjusted to optimize its noise reduction effect, it will be difficult to meet the user's noise reduction requirements. Therefore, the fan speed is reduced and the noise reduction parameters of the silencer are readjusted until the overall noise parameter value is less than or equal to the target overall noise parameter value.

[0086] For example, see Figure 9 , Figure 9 This is a second workflow diagram of the controller provided in an embodiment of the present invention, wherein the controller is used to execute steps S16 to S22:

[0087] S16. In response to the low-noise operation command, determine the noise parameter frequency band with the largest noise contribution value based on the duct noise parameter value, and use it as the target frequency band, and then proceed to step S17.

[0088] S17. Determine whether the current optimal silencing frequency band of the acquired muffler matches the target frequency band. If yes, proceed to step S20; otherwise, proceed to step S18.

[0089] S18. Control the muffler to adjust the silencing parameters by a first preset step size, and then proceed to step S19.

[0090] It is worth noting that the specific value of the first preset step size is set by the manufacturer according to the actual situation, and is not limited here.

[0091] S19. Determine whether the reduction in noise parameter value of the duct in the target frequency band meets the preset adjustment end condition. If yes, proceed to step S20; otherwise, return to step S18.

[0092] S20. Determine whether the current whole machine noise parameter value detected by the whole machine noise parameter detection device is less than or equal to the preset target whole machine noise parameter value. If yes, proceed to step S21; otherwise, proceed to step S22.

[0093] It is worth noting that the specific values ​​of the target overall noise parameters are set by the manufacturer according to the actual situation, and are not limited here.

[0094] S21. Record the current silencing parameters of the silencer and the current speed of the refrigerator fan to establish the correspondence between the silencing parameters and the fan speed.

[0095] S22. Reduce the speed of the fan by a preset speed reduction amount, and readjust the noise reduction parameters of the silencer.

[0096] It is worth noting that the specific value of the preset speed reduction is set by the manufacturer according to the actual situation, and is not limited here.

[0097] In this embodiment of the invention, the noise reduction effect of the fan is first improved by adjusting the noise reduction parameters of the muffler. Only when the noise reduction effect fails to meet expectations is the fan speed reduced and the noise reduction parameters readjusted. This approach can balance low noise control and cooling effect as much as possible, and reduce the impact on the refrigerator's cooling effect.

[0098] In one embodiment, the refrigerator further includes a bottom-cooling fan (not shown in the figure), located near the condenser, for dissipating heat from the condenser; the fan is a storage compartment fan, used to deliver the cooling capacity into the storage compartment; the controller is further configured to: after adjusting the noise reduction parameters, before reducing the fan speed by a preset speed reduction amount, if the current overall noise parameter value is greater than the target overall noise parameter value, reduce the speed of the bottom-cooling fan by a preset bottom-cooling step size until the current overall noise parameter value is less than or equal to the target overall noise parameter value, or the refrigerator energy consumption does not meet a preset low energy consumption condition; wherein, the preset low energy consumption condition is that the refrigerator energy consumption after the bottom-cooling fan speed reduction is less than or equal to the refrigerator energy consumption before the bottom-cooling fan speed reduction; when the refrigerator energy consumption does not meet the preset low energy consumption condition, control the bottom-cooling fan to increase its speed by the preset bottom-cooling step size.

[0099] Specifically, to improve the refrigerator's cooling effect, a bottom-cooling fan is installed near the condenser to dissipate heat from it, thus accelerating the condenser's heat exchange efficiency to a certain extent. This allows the compressor to operate at its full potential, further enhancing the refrigerator's cooling performance. If adjusting the muffler's noise reduction parameters does not yet achieve the desired effect, the speed of the bottom-cooling fan is adjusted instead of reducing the speed of the storage compartment fan to achieve noise reduction. However, since the bottom-cooling fan acts on the condenser to enhance the refrigerator's heat dissipation, excessively low fan speeds hinder heat dissipation, negatively impacting compressor efficiency and increasing energy consumption. Therefore, while adjusting the bottom-cooling fan speed, it is necessary to monitor the refrigerator's energy consumption, balancing low-energy operation, low-noise control, and ensuring optimal cooling performance.

[0100] It is worth noting that after adjusting the speed of the bottom cooling fan, a preset time needs to be waited for the obtained refrigerator energy consumption to accurately reflect the impact of the current operating status of the relevant components on energy consumption. The waiting time can be set by the staff according to the actual situation and is not limited here.

[0101] In one embodiment, the silencer is a micro-perforated plate silencer, the silencing parameter is the cavity depth, and the noise parameter is the noise value, vibration acceleration, or sound quality. The controller is further configured to: when the current optimal silencing frequency band is greater than the target frequency band, control the micro-perforated plate silencer to gradually increase the cavity depth by a first preset step size until a preset adjustment end condition is met; when the current optimal silencing frequency band is less than the target frequency band, control the micro-perforated plate silencer to gradually decrease the cavity depth by the first preset step size until the preset adjustment end condition is met.

[0102] Specifically, the silencer used in this embodiment of the invention is a micro-perforated plate silencer. The micro-perforated plate silencer is a resonant sound-absorbing structure that does not use any porous sound-absorbing material. It only drills many micro-holes in a thin metal plate with a thickness of less than 1 mm. The diameter of these micro-holes is generally about 0.5 to 1 mm, and the perforation rate is between 1% and 3%. A certain cavity is left behind the perforated plate, which becomes the micro-perforated plate sound-absorbing structure. By changing the cavity depth, the micro-perforated plate silencer can be used for noise elimination in different frequency bands. The larger the cavity depth of the micro-perforated plate silencer, the lower the resonant frequency, that is, the lower the corresponding optimal noise reduction frequency band.

[0103] In one embodiment, the silencer is a thin-film acoustic metamaterial silencer, the silencing parameter is the film tension, and the noise parameter is the noise value, vibration acceleration, or sound quality. The controller is further configured to: when the current optimal silencing frequency band is greater than the target frequency band, control the thin-film acoustic metamaterial silencer to gradually increase the film tension by a second preset step size until a preset adjustment termination condition is met; when the current optimal silencing frequency band is less than the target frequency band, control the thin-film acoustic metamaterial silencer to gradually decrease the film tension by the second preset step size until the preset adjustment termination condition is met.

[0104] Specifically, thin-film acoustic metamaterial mufflers also achieve noise reduction through resonance. By changing the film tension, the thin-film acoustic metamaterial mufflers can be adapted to noise reduction in different frequency bands. The greater the film tension and stiffness of the thin-film acoustic metamaterial muffler, the higher the resonance frequency, which corresponds to the higher optimal noise reduction frequency band.

[0105] In one embodiment, the preset adjustment termination condition is: the reduction in noise parameters of the current target frequency band is greater than or equal to the preset target reduction; or, the reduction in noise parameters of the current target frequency band is less than the preset target reduction, greater than the reduction in noise parameters of the left adjacent frequency band, and greater than the reduction in noise parameters of the right adjacent frequency band; wherein, the reduction in noise parameters of the current target frequency band is the difference in noise contribution value of the noise parameter value before and after the adjustment of the muffler's silencing parameters in the target frequency band, the reduction in noise parameters of the left adjacent frequency band is the difference in noise contribution value of the noise parameter value before and after the adjustment of the muffler's silencing parameters in the left adjacent frequency band, and the reduction in noise parameters of the right adjacent frequency band is the difference in noise contribution value of the noise parameter value before and after the adjustment of the muffler's silencing parameters in the right adjacent frequency band.

[0106] Specifically, if the reduction in noise parameters of the current target frequency band is greater than or equal to the preset target reduction, it means that the noise reduction has met the requirements and the current silencing parameters of the muffler can effectively reduce noise. If the reduction in noise parameters of the current target frequency band is less than the preset target reduction, the reduction in noise parameters of the left and right adjacent frequency bands of the target frequency band is analyzed. If the reduction in noise parameters of the left and right adjacent frequency bands is lower than the reduction in noise parameters of the current target frequency band, it means that the current optimal silencing frequency band of the muffler is the target frequency band.

[0107] It is worth noting that the specific value of the preset target reduction amount is set by the manufacturer according to the actual situation, and is not limited here.

[0108] For example, see Figure 10 , Figure 10 This is a third flowchart of the controller provided in an embodiment of the present invention, wherein the controller is used to execute steps S23 to S28:

[0109] S23. In response to the low-noise operation command, determine the noise parameter frequency band with the largest noise contribution value based on the noise parameter value detected by the noise parameter detection device, and use it as the target frequency band, and then proceed to step S24.

[0110] S24. Determine whether the current optimal silencing frequency band of the acquired muffler matches the target frequency band. If yes, proceed to step S28; otherwise, proceed to step S25.

[0111] S25. Control the muffler to adjust the silencing parameters in a preset step size, and then proceed to step S26.

[0112] S26. Determine whether the reduction amount of the noise parameter in the current target frequency band is greater than or equal to the preset target reduction amount. If yes, proceed to step S28; otherwise, proceed to step S27.

[0113] S27. Determine whether the current target frequency band noise parameter reduction amount meets the condition of "less than the preset target reduction amount, greater than the left adjacent frequency band noise parameter reduction amount and greater than the right adjacent frequency band noise parameter reduction amount". If yes, proceed to step S28; otherwise, return to step S25.

[0114] S28. Control the muffler to maintain the current muffler parameters.

[0115] In a preferred embodiment, the controller is further configured to: set noise parameter test values ​​for different frequency bands; adjust the silencing parameters of the muffler for each frequency band's noise parameter test value, select the silencing parameter with the smallest noise parameter test value after silencing by the muffler, establish a correspondence between the silencing parameter and the optimal silencing frequency band; obtain the current silencing parameters of the muffler, and determine the current optimal silencing frequency band based on the correspondence between the silencing parameters and the optimal silencing frequency band.

[0116] Specifically, by setting noise parameter test values ​​for different frequency bands and conducting tests one by one, the corresponding silencing parameters are found, and the correspondence between silencing parameters and the optimal silencing frequency band is established. In practical applications, when it is necessary to adjust the silencing parameters of the muffler to adapt to the real-time refrigerator noise, the real-time silencing parameters of the muffler are obtained. Combining the correspondence between the silencing parameters and the optimal silencing frequency band, the current optimal silencing frequency band is determined. The optimal silencing frequency band of the muffler can be determined based on the obtained real-time silencing parameters.

[0117] In one implementation, when the current optimal silencing frequency band matches the target frequency, the silencer is controlled to maintain the current silencing parameters.

[0118] Specifically, the noise reduction effect of a muffler varies depending on the noise reduction parameters of the muffler, depending on the noise reduction parameters of the muffler. Therefore, by obtaining the current optimal noise reduction frequency band of the muffler and comparing it with the target frequency band, if they match, it means that the muffler can effectively eliminate noise and there is no need to adjust the noise reduction parameters of the muffler.

[0119] In one embodiment, the whole machine noise parameter detection device is a whole machine noise sensor, the whole machine noise parameter value is the whole machine noise value, and the target whole machine noise parameter value is the target whole machine noise value;

[0120] The controller is also used for:

[0121] After the refrigerator restarts, for each noise reduction parameter and the corresponding relationship between the fan speed, when the real-time noise value detected by the whole machine noise sensor is greater than the target whole machine noise value, the relationship between the noise reduction parameter and the fan speed is adjusted.

[0122] Specifically, after generating the correspondence between the noise reduction parameters and the fan speed, in subsequent applications, due to factors such as refrigerator aging, the noise of the fan may differ at the same speed. Therefore, it is necessary to readjust and update the correspondence between the noise reduction parameters and the fan speed.

[0123] Compared to existing technologies, the refrigerator disclosed in this invention, in response to a low-noise operation command, acquires noise parameter values ​​detected by a noise parameter detection device to determine the frequency band with the largest noise contribution as the target frequency band. When the acquired optimal silencing frequency band of the muffler does not match the target frequency band, the muffler is controlled to adjust the silencing parameters by a preset step size until the noise parameter reduction in the target frequency band meets a preset adjustment termination condition. Therefore, this invention can achieve rapid and accurate noise reduction in the refrigerator without affecting its cooling effect by first determining the frequency band with the largest noise contribution and then specifically adjusting the silencing parameters of the muffler, thus improving the user experience.

[0124] See Figure 11 , Figure 11 This is a flowchart of a refrigerator noise reduction method provided in an embodiment of the present invention. The refrigerator noise reduction method described in this embodiment of the present invention is implemented by a controller in the refrigerator; the method includes:

[0125] S1. Determine the frequency band of the noise parameter with the largest noise contribution value based on the noise parameter value detected by the noise parameter detection device, and use it as the target frequency band; wherein, the noise parameter detection device is installed on the refrigerator;

[0126] S2. When the current optimal silencing frequency band of the acquired muffler does not match the target frequency band, the muffler is controlled to adjust the silencing parameters by a preset step size until the noise parameter value in the target frequency band meets the preset adjustment end condition; wherein, the muffler is located inside the refrigerator.

[0127] In one implementation, it further includes:

[0128] The refrigerator also includes a whole-machine noise parameter detection device, which is installed on the refrigerator and is used to detect the whole-machine noise parameter value;

[0129] The noise parameter detection device is a duct noise parameter detection device, which is installed on the duct of the refrigerator, and the noise parameter value is the duct noise parameter value.

[0130] The method further includes:

[0131] After adjusting the noise reduction parameters, if the current noise reduction parameter value detected by the whole machine noise parameter detection device is less than or equal to the preset target noise reduction parameter value, the current noise reduction parameter of the silencer and the current speed of the refrigerator fan are recorded to establish the correspondence between the noise reduction parameters and the fan speed.

[0132] After adjusting the noise reduction parameters, if the current overall noise parameter value is greater than the target overall noise parameter value, the fan speed is reduced by a preset speed reduction amount, and the noise reduction parameters of the silencer are readjusted.

[0133] In one embodiment, the refrigerator further includes:

[0134] The refrigerant circuit circulates refrigerant sequentially through a compressor, condenser, pressure reducer, and evaporator to provide cooling capacity to the refrigerator's storage compartment.

[0135] A bottom-cooled fan is located near the condenser to dissipate heat from the condenser;

[0136] The fan is a storage room fan, used to deliver the cooling energy into the storage room;

[0137] The method further includes:

[0138] After adjusting the noise reduction parameters, before reducing the fan speed by a preset reduction amount, if the current overall noise parameter value is greater than the target overall noise parameter value, the speed of the bottom cooling fan is reduced by a preset bottom cooling step size until the current overall noise parameter value is less than or equal to the target overall noise parameter value, or the refrigerator energy consumption does not meet the preset low energy consumption condition; wherein, the preset low energy consumption condition is that the refrigerator energy consumption after the bottom cooling fan speed is reduced is less than or equal to the refrigerator energy consumption before the bottom cooling fan speed is reduced;

[0139] When the refrigerator's energy consumption does not meet the preset low energy consumption condition, the bottom cooling fan is controlled to increase its speed by the preset bottom cooling step.

[0140] In one embodiment, the silencer is a micro-perforated plate silencer, the silencer parameter is the cavity depth, and the noise parameter value is the noise value, vibration acceleration, or sound quality.

[0141] The method further includes:

[0142] When the current optimal silencing frequency band is greater than the target frequency band, the micro-perforated plate silencer is controlled to gradually increase the cavity depth by a first preset step size until the preset adjustment end condition is met.

[0143] When the current optimal silencing frequency band is less than the target frequency band, the micro-perforated plate silencer is controlled to gradually reduce the cavity depth by the first preset step size until the preset adjustment end condition is met.

[0144] In one embodiment, the silencer is a thin-film acoustic metamaterial silencer, the silencer parameter is the thin-film tension, and the noise parameter value is the noise value, vibration acceleration, or sound quality.

[0145] The method further includes:

[0146] When the current optimal silencing frequency band is greater than the target frequency band, the thin-film acoustic metamaterial silencing device is controlled to gradually increase the film tension by a second preset step size until the preset adjustment end condition is met.

[0147] When the current optimal silencing frequency band is less than the target frequency band, the thin-film acoustic metamaterial silencer is controlled to gradually reduce the film tension by the second preset step size until the preset adjustment end condition is met.

[0148] In one implementation, the preset adjustment termination condition is:

[0149] The reduction in noise parameters in the current target frequency band is greater than or equal to the preset target reduction.

[0150] Alternatively, the reduction in noise parameters of the current target frequency band is less than the preset target reduction, greater than the reduction in noise parameters of the left adjacent frequency band, and greater than the reduction in noise parameters of the right adjacent frequency band.

[0151] Wherein, the reduction amount of noise parameter in the current target frequency band is the difference between the noise parameter value before and after the adjustment of the muffler's silencing parameter and the noise contribution value in the target frequency band; the reduction amount of noise parameter in the left adjacent frequency band is the difference between the noise parameter value before and after the adjustment of the muffler's silencing parameter and the noise contribution value in the left adjacent frequency band; and the reduction amount of noise parameter in the right adjacent frequency band is the difference between the noise parameter value before and after the adjustment of the muffler's silencing parameter and the noise contribution value in the right adjacent frequency band.

[0152] In one embodiment, the method further includes:

[0153] Set test values ​​for noise parameters in different frequency bands;

[0154] For each frequency band, the noise reduction parameters of the muffler are adjusted, and the noise reduction parameter with the smallest noise reduction value after being reduced by the muffler is selected. The correspondence between the noise reduction parameter and the optimal noise reduction frequency band is established.

[0155] Obtain the current noise reduction parameters of the muffler, and determine the current optimal noise reduction frequency band based on the correspondence between the noise reduction parameters and the optimal noise reduction frequency band.

[0156] In one embodiment, the method further includes:

[0157] When the current optimal silencing frequency band matches the target frequency, the silencer is controlled to maintain the current silencing parameters.

[0158] In one embodiment, the whole machine noise parameter detection device is a whole machine noise sensor, the whole machine noise parameter value is the whole machine noise value, and the target whole machine noise parameter value is the target whole machine noise value;

[0159] The method further includes:

[0160] After the refrigerator restarts, based on the correspondence between each noise reduction parameter and the fan speed, when the real-time overall noise value detected by the overall noise sensor is greater than the target overall noise value, the correspondence between the noise reduction parameter and the fan speed is adjusted.

[0161] It is worth noting that the working process of any refrigerator noise reduction method in the embodiments of the present invention can refer to the specific working process of the refrigerator controller described in the above embodiments, and will not be repeated here.

[0162] Compared to existing technologies, the refrigerator noise reduction method disclosed in this invention, in response to a low-noise operation command, acquires the noise parameter values ​​detected by a noise parameter detection device to determine the frequency band with the largest noise contribution as the target frequency band. When the acquired optimal silencing frequency band of the muffler does not match the target frequency band, the muffler is controlled to adjust the silencing parameters by a preset step size until the noise parameter reduction in the target frequency band meets a preset adjustment termination condition. Therefore, this invention can achieve rapid and accurate noise reduction in refrigerators without affecting the cooling effect by first determining the frequency band with the largest noise contribution and then specifically adjusting the silencing parameters of the muffler.

[0163] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A refrigerator characterized by comprising: include: A muffler, located inside the refrigerator, is used to reduce refrigerator noise; the muffler's noise reduction parameters are adjustable. A noise parameter detection device is installed on the refrigerator to detect noise parameter values; Controller, used for: In response to the low-noise operation command, the noise parameter frequency band with the largest noise contribution value is determined based on the noise parameter value detected by the noise parameter detection device, and used as the target frequency band; When the current optimal noise reduction frequency band of the silencer does not match the target frequency band, the silencer is controlled to adjust the noise reduction parameters by a preset step size until the noise parameter value in the target frequency band meets the preset adjustment end condition. The refrigerator also includes a whole-machine noise parameter detection device, which is installed on the refrigerator and is used to detect the whole-machine noise parameter value; The noise parameter detection device is a duct noise parameter detection device, which is installed on the duct of the refrigerator, and the noise parameter value is the duct noise parameter value. The controller is also used for: After adjusting the noise reduction parameters, if the current noise reduction parameter value detected by the whole machine noise parameter detection device is less than or equal to the preset target noise reduction parameter value, the current noise reduction parameter of the silencer and the current speed of the refrigerator fan are recorded to establish the correspondence between the noise reduction parameters and the fan speed. After adjusting the noise reduction parameters, if the current overall noise parameter value is greater than the target overall noise parameter value, the fan speed is reduced by a preset speed reduction amount, and the noise reduction parameters of the silencer are readjusted.

2. The refrigerator as described in claim 1, characterized in that, The refrigerator also includes: The refrigerant circuit circulates refrigerant sequentially through a compressor, condenser, pressure reducer, and evaporator to provide cooling capacity to the refrigerator's storage compartment. A bottom-cooled fan is located near the condenser to dissipate heat from the condenser; The fan is a storage room fan, used to deliver the cooling energy into the storage room; The controller is also used for: After adjusting the noise reduction parameters, before reducing the fan speed by a preset reduction amount, if the current overall noise parameter value is greater than the target overall noise parameter value, the speed of the bottom cooling fan is reduced by a preset bottom cooling step size until the current overall noise parameter value is less than or equal to the target overall noise parameter value, or the refrigerator energy consumption does not meet the preset low energy consumption condition; wherein, the preset low energy consumption condition is that the refrigerator energy consumption after the bottom cooling fan speed is reduced is less than or equal to the refrigerator energy consumption before the bottom cooling fan speed is reduced; When the refrigerator's energy consumption does not meet the preset low energy consumption condition, the bottom cooling fan is controlled to increase its speed by the preset bottom cooling step.

3. The refrigerator as described in claim 1, characterized in that, The silencer is a micro-perforated plate silencer, the silencer parameter is the cavity depth, and the noise parameter value is the noise value, vibration acceleration, or sound quality. The controller is also used for: When the current optimal silencing frequency band is greater than the target frequency band, the micro-perforated plate silencer is controlled to gradually increase the cavity depth by a first preset step size until the preset adjustment end condition is met. When the current optimal silencing frequency band is less than the target frequency band, the micro-perforated plate silencer is controlled to gradually reduce the cavity depth by the first preset step size until the preset adjustment end condition is met.

4. The refrigerator as described in claim 1, characterized in that, The silencer is a thin-film acoustic metamaterial silencer, the silencer parameter is the thin-film tension, and the noise parameter value is the noise value, vibration acceleration, or sound quality. The controller is also used for: When the current optimal silencing frequency band is greater than the target frequency band, the thin-film acoustic metamaterial silencing device is controlled to gradually increase the film tension by a second preset step size until the preset adjustment end condition is met. When the current optimal silencing frequency band is less than the target frequency band, the thin-film acoustic metamaterial silencer is controlled to gradually reduce the film tension by the second preset step size until the preset adjustment end condition is met.

5. The refrigerator as described in claim 3 or 4, characterized in that, The preset adjustment termination condition is: The reduction in noise parameters in the current target frequency band is greater than or equal to the preset target reduction. Alternatively, the reduction in noise parameters of the current target frequency band is less than the preset target reduction, greater than the reduction in noise parameters of the left adjacent frequency band, and greater than the reduction in noise parameters of the right adjacent frequency band. Wherein, the reduction amount of noise parameter in the current target frequency band is the difference between the noise parameter value before and after the adjustment of the muffler's silencing parameter and the noise contribution value in the target frequency band; the reduction amount of noise parameter in the left adjacent frequency band is the difference between the noise parameter value before and after the adjustment of the muffler's silencing parameter and the noise contribution value in the left adjacent frequency band; and the reduction amount of noise parameter in the right adjacent frequency band is the difference between the noise parameter value before and after the adjustment of the muffler's silencing parameter and the noise contribution value in the right adjacent frequency band.

6. The refrigerator as described in any one of claims 1 to 4, characterized in that, The controller is also used for: Set test values ​​for noise parameters in different frequency bands; For each frequency band, the noise reduction parameters of the muffler are adjusted, and the noise reduction parameter with the smallest noise reduction value after being reduced by the muffler is selected. The correspondence between the noise reduction parameter and the optimal noise reduction frequency band is established. Obtain the current noise reduction parameters of the muffler, and determine the current optimal noise reduction frequency band based on the correspondence between the noise reduction parameters and the optimal noise reduction frequency band.

7. The refrigerator as described in any one of claims 1 to 4, characterized in that, The controller is also used for: When the current optimal silencing frequency band matches the target frequency, the silencer is controlled to maintain the current silencing parameters.

8. The refrigerator as described in any one of claims 2 to 4, characterized in that, The overall noise parameter detection device is an overall noise sensor, the overall noise parameter value is the overall noise value, and the target overall noise parameter value is the target overall noise value. The controller is also used for: After the refrigerator restarts, for each noise reduction parameter and the corresponding relationship between the fan speed, when the real-time noise value detected by the whole machine noise sensor is greater than the target whole machine noise value, the relationship between the noise reduction parameter and the fan speed is adjusted.

9. A method for reducing noise in a refrigerator, characterized in that, include: The noise parameter frequency band with the largest noise contribution value is determined based on the noise parameter values ​​detected by the noise parameter detection device, and is used as the target frequency band. The noise parameter detection device is installed on the refrigerator, specifically a duct noise parameter detection device located on the refrigerator's air duct. The noise parameter value is the duct noise parameter value. When the current optimal noise reduction frequency band of the silencer does not match the target frequency band, the silencer is controlled to adjust the noise reduction parameters by a preset step size until the noise parameter value in the target frequency band meets the preset adjustment termination condition; wherein, the silencer is located inside the refrigerator; After adjusting the noise reduction parameters, if the current noise parameter value detected by the whole machine noise parameter detection device is less than or equal to the preset target noise parameter value, the current noise reduction parameters of the silencer and the current speed of the refrigerator fan are recorded to establish the correspondence between the noise reduction parameters and the fan speed; the whole machine noise parameter detection device is installed on the refrigerator. After adjusting the noise reduction parameters, if the current overall noise parameter value is greater than the target overall noise parameter value, the fan speed is reduced by a preset speed reduction amount, and the noise reduction parameters of the silencer are readjusted.

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