Refrigerator and noise reduction method thereof

Abstract

The invention discloses a refrigerator and a noise reduction method thereof.The refrigerator comprises a refrigerator body, a refrigerating system, a sound pressure sensor and a controller, and the refrigerating system is arranged in the refrigerator body and comprises a compressor, a condenser, an evaporator and a fan; the sound pressure sensor is arranged in a compressor bin and used for detecting sound pressure of the compressor under different frequencies. The controller is configured to judge whether the high-frequency resonance abnormal sound of the compressor exists or not according to the sound pressure, detected by the sound pressure sensor, of the compressor at different frequencies and the sound pressure peak value, detected by the sound pressure sensor, of the compressor at different rotating speeds during operation of the refrigerator; and if it is judged that the high-frequency resonance abnormal sound of the compressor exists, the carrier frequency of the compressor is adjusted till the high-frequency resonance abnormal sound of the compressor is eliminated. According to the method, the high-frequency resonance abnormal sound of the compressor is identified, and the carrier frequency of the compressor is adjusted after the existence of the high-frequency resonance abnormal sound is identified, so that the high-frequency resonance abnormal sound of the compressor is eliminated, and the user experience is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerators, and in particular to a refrigerator and a noise reduction method thereof. Background Art

[0002] The carrier frequency is a fixed frequency that is not directly transmitted during signal transmission, but loaded onto a wave of a fixed frequency. This process is called loading. Strictly speaking, it is to modulate a lower signal frequency to a relatively higher frequency. This higher frequency modulated by the low frequency is called the carrier frequency, also called the base frequency. The carrier frequency can be used to control the accuracy of the compressor speed. The larger the carrier frequency, the higher the accuracy of the compressor speed. At present, the commonly used carrier frequency for refrigerator compressors is 5000Hz, but some products have high-frequency abnormal noise problems at a carrier frequency of 5000Hz. The high-frequency noise is sharp, and the high noise will seriously affect the user experience, which will lead to a large number of users withdrawing the machine. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a refrigerator and a noise reduction method thereof, by identifying the high-frequency resonance noise of the compressor, and adjusting the carrier frequency of the compressor after identifying the presence of the high-frequency resonance noise, thereby eliminating the high-frequency resonance noise of the compressor and effectively improving the user experience.

[0004] A refrigerator provided in a first embodiment of the present invention includes:

[0005] The box body, which serves as the supporting structure of the refrigerator, has several compartments inside;

[0006] A refrigeration system, which is arranged in the box, includes a compressor, a condenser, an evaporator and a fan;

[0007] The compressor is used to provide power for the refrigeration cycle of the refrigerator, compressing the low-temperature, low-pressure refrigerant into a high-temperature, high-pressure refrigerant gas;

[0008] The condenser is used to condense and dissipate heat of high-temperature, high-pressure refrigerant gas, and cool the high-temperature, high-pressure refrigerant gas into a normal-temperature, high-pressure refrigerant liquid;

[0009] The evaporator is used to evaporate and absorb heat from a normal temperature and high pressure refrigerant liquid, and vaporize the normal temperature and high pressure refrigerant liquid into a low temperature and low pressure gas;

[0010] The fan is used to allow air to enter the evaporator of the refrigerator for heat exchange and to send the heat-released air into the refrigerator compartment;

[0011] A sound pressure sensor is disposed inside the compressor compartment and is used to detect the sound pressure of the compressor at different frequencies;

[0012] The controller is configured to, during the operation of the refrigerator, determine whether there is abnormal high-frequency resonance noise of the compressor based on the sound pressure of the compressor at different frequencies and the sound pressure peak values ​​at different speeds of the compressor detected by the sound pressure sensor; if it is determined that there is abnormal high-frequency resonance noise of the compressor, adjust the carrier frequency of the compressor until the abnormal high-frequency resonance noise of the compressor is eliminated.

[0013] In the refrigerator provided by the second embodiment of the present invention, judging whether there is a high-frequency resonance abnormal sound of the compressor according to the sound pressure of the compressor at different frequencies and the sound pressure peak value of the compressor at different speeds detected by the sound pressure sensor specifically includes:

[0014] Determining whether there is a high-frequency abnormal sound according to the sound pressure of the compressor at different frequencies detected by the sound pressure sensor;

[0015] If it is determined that the high-frequency abnormal sound exists, the rotation speed of the compressor is adjusted, and whether there is a high-frequency resonance abnormal sound of the compressor is determined based on the sound pressure peak values ​​at different rotation speeds of the compressor.

[0016] In the refrigerator provided by the third embodiment of the present invention, judging whether there is a high-frequency abnormal sound according to the sound pressure of the compressor at different frequencies detected by the sound pressure sensor specifically includes:

[0017] Performing one-third octave band processing on the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor to obtain an unweighted one-third octave band spectrum diagram;

[0018] Performing A-weighting processing on the unweighted one-third octave band spectrum to obtain an A-weighted one-third octave band spectrum;

[0019] If there is an abnormal sound pressure peak in the A-weighted one-third octave spectrum, it is determined that the high-frequency abnormal sound exists.

[0020] In the refrigerator provided by the fourth embodiment of the present invention, the adjusting the rotation speed of the compressor and judging whether there is a high-frequency resonance abnormal sound of the compressor according to the sound pressure peak value at different rotation speeds of the compressor specifically include:

[0021] adjusting the rotation speed of the compressor, performing A-weighting processing on the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor at each rotation speed, and obtaining a sound pressure refinement spectrum;

[0022] Extracting sound pressure peaks greater than a first threshold from the sound pressure refined spectrum, sorting the sound pressure peaks, and calculating differences between adjacent sound pressure peaks;

[0023] Determining whether the difference divided by the current speed of the compressor satisfies a preset condition;

[0024] If the number of preset conditions met reaches a second threshold, it is determined that there is a high-frequency resonance abnormal sound of the compressor.

[0025] In the refrigerator provided in the fifth embodiment of the present invention, the adjusting of the carrier frequency of the compressor until the high-frequency resonance abnormal sound of the compressor is eliminated specifically includes:

[0026] The carrier frequency is sequentially reduced from an initial value to perform order adjustment, and the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor are processed by one-third octave band to obtain an unweighted one-third octave band spectrum diagram;

[0027] Performing A-weighting processing on the unweighted one-third octave band spectrum to obtain an A-weighted one-third octave band spectrum;

[0028] If there is no abnormal sound pressure peak in the A-weighted one-third octave spectrum, it is determined that the high-frequency resonance noise of the compressor is eliminated, and the current carrier frequency is set to the carrier frequency of the compressor.

[0029] In the refrigerator provided in the sixth embodiment of the present invention, the controller is further configured as follows:

[0030] When it is determined that the high-frequency resonance abnormal sound of the compressor is eliminated, switching the operation mode of the compressor to a stable operation mode;

[0031] If the compressor is not detected to be shut down within the first preset time, the rotation speed of the compressor is increased to continue to maintain the stable operation mode.

[0032] If the compressor is detected to be shut down within the first preset time, the operation mode of the compressor is switched to a defrost mode;

[0033] If the compressor in the defrost mode is not detected to be shut down within the second preset time, the speed of the compressor is increased to continue to maintain the defrost mode;

[0034] If it is detected that the compressor in the defrost mode stops within the second preset time, the current speed of the compressor is set to the periodic operation speed;

[0035] Wherein, the first preset time is less than the second preset time; and the speed of the compressor in the stable operation mode is less than the speed of the compressor in the defrost mode.

[0036] A refrigerator noise reduction method is provided in a seventh embodiment of the present invention, and the method is applied to a refrigerator including a cabinet, a refrigeration system, and a sound pressure sensor; wherein the sound pressure sensor is arranged inside the compressor compartment, and is used to detect the sound pressure of the compressor at different frequencies. The refrigerator noise reduction method includes:

[0037] During the operation of the refrigerator, judging whether there is a high-frequency resonance abnormal sound of the compressor according to the sound pressure of the compressor at different frequencies and the sound pressure peaks of the compressor at different speeds detected by the sound pressure sensor;

[0038] If it is determined that the compressor has a high-frequency resonance abnormal sound, the carrier frequency of the compressor is adjusted until the high-frequency resonance abnormal sound of the compressor is eliminated.

[0039] In the refrigerator noise reduction method provided by the eighth embodiment of the present invention, judging whether there is a high-frequency resonance abnormal sound of the compressor according to the sound pressure of the compressor at different frequencies and the sound pressure peak value of the compressor at different speeds detected by the sound pressure sensor specifically includes:

[0040] Determining whether there is a high-frequency abnormal sound according to the sound pressure of the compressor at different frequencies detected by the sound pressure sensor;

[0041] If it is determined that the high-frequency abnormal sound exists, the rotation speed of the compressor is adjusted, and whether there is a high-frequency resonance abnormal sound of the compressor is determined based on the sound pressure peak values ​​at different rotation speeds of the compressor.

[0042] In the refrigerator noise reduction method provided by the ninth embodiment of the present invention, judging whether there is a high-frequency abnormal sound according to the sound pressure of the compressor at different frequencies detected by the sound pressure sensor specifically includes:

[0043] Performing one-third octave band processing on the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor to obtain an unweighted one-third octave band spectrum diagram;

[0044] Performing A-weighting processing on the unweighted one-third octave band spectrum to obtain an A-weighted one-third octave band spectrum;

[0045] If there is an abnormal sound pressure peak in the A-weighted one-third octave spectrum, it is determined that the high-frequency abnormal sound exists.

[0046] In the refrigerator noise reduction method provided by the tenth embodiment of the present invention, the adjusting the rotation speed of the compressor and judging whether there is a high-frequency resonance abnormal sound of the compressor according to the sound pressure peak value at different rotation speeds of the compressor specifically include:

[0047] adjusting the rotation speed of the compressor, performing A-weighting processing on the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor at each rotation speed, and obtaining a sound pressure refinement spectrum;

[0048] Extracting sound pressure peaks greater than a first threshold from the sound pressure refined spectrum, sorting the sound pressure peaks, and calculating differences between adjacent sound pressure peaks;

[0049] Determining whether the difference divided by the current speed of the compressor satisfies a preset condition;

[0050] If the number of preset conditions met reaches a second threshold, it is determined that there is a high-frequency resonance abnormal sound of the compressor.

[0051] In the refrigerator noise reduction method provided by the eleventh embodiment of the present invention, the carrier frequency of the compressor is adjusted until the high-frequency resonance abnormal sound of the compressor is eliminated, which specifically includes:

[0052] The carrier frequency is sequentially reduced from an initial value to perform order adjustment, and the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor are processed by one-third octave band to obtain an unweighted one-third octave band spectrum diagram;

[0053] Performing A-weighting processing on the unweighted one-third octave band spectrum to obtain an A-weighted one-third octave band spectrum;

[0054] If there is no abnormal sound pressure peak in the A-weighted one-third octave spectrum, it is determined that the high-frequency resonance noise of the compressor is eliminated, and the current carrier frequency is set to the carrier frequency of the compressor.

[0055] In the refrigerator noise reduction method provided by the twelfth embodiment of the present invention, the method further includes:

[0056] When it is determined that the high-frequency resonance abnormal sound of the compressor is eliminated, switching the operation mode of the compressor to a stable operation mode;

[0057] If the compressor is not detected to be shut down within the first preset time, the rotation speed of the compressor is increased to continue to maintain the stable operation mode.

[0058] If the compressor is detected to be shut down within the first preset time, the operation mode of the compressor is switched to a defrost mode;

[0059] If the compressor in the defrost mode is not detected to be shut down within the second preset time, the speed of the compressor is increased to continue to maintain the defrost mode;

[0060] If it is detected that the compressor in the defrost mode stops within the second preset time, the current speed of the compressor is set to the periodic operation speed;

[0061] Wherein, the first preset time is less than the second preset time; and the speed of the compressor in the stable operation mode is less than the speed of the compressor in the defrost mode.

[0062] Compared with the prior art, the beneficial effect of a refrigerator and a noise reduction method thereof provided by an embodiment of the present invention is that a sound pressure sensor is arranged inside the compressor compartment to detect the sound pressure of the compressor at different frequencies. During the operation of the refrigerator, it is determined whether there is a high-frequency resonance abnormal sound of the compressor based on the sound pressure of the compressor at different frequencies detected by the sound pressure sensor and the sound pressure peak value of the compressor at different speeds; if it is determined that there is a high-frequency resonance abnormal sound of the compressor, the carrier frequency of the compressor is adjusted until the high-frequency resonance abnormal sound of the compressor is eliminated. The embodiment of the present invention eliminates the high-frequency resonance abnormal sound of the compressor by identifying the high-frequency resonance abnormal sound of the compressor and adjusting the carrier frequency of the compressor after identifying the existence of the high-frequency resonance abnormal sound, thereby effectively improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 is a structural schematic diagram of a refrigerator provided by an embodiment of the present invention;

[0064] Figure 2 It is a structural schematic diagram of a refrigerator body provided by one embodiment of the present invention;

[0065] Figure 3 It is a structural schematic diagram of a single refrigeration system of a refrigerator provided by an embodiment of the present invention;

[0066] Figure 4 It is a structural schematic diagram of a dual refrigeration system of a refrigerator provided by one embodiment of the present invention;

[0067] Figure 5 is a schematic diagram of the distribution of a sound pressure sensor of a refrigerator provided by an embodiment of the present invention;

[0068] Figure 6 is a first working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0069] Figure 7 is a second working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0070] Figure 8 It is an A-weighted one-third octave spectrum diagram of the sound pressure of a compressor in a refrigerator provided by one embodiment of the present invention;

[0071] Fig. 9 It is a sound pressure refinement spectrum of a compressor in a refrigerator provided by an embodiment of the present invention;

[0072] Fig.10 is a third working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0073] Fig.11 This is a fourth working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0074] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0075] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0076] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0077] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0078] See also Figure 1 , Figure 1 : is a schematic diagram of the structure of a refrigerator provided in one embodiment of the present invention. The refrigerator provided in the embodiment of the present invention comprises:

[0079] The box body 10, which serves as the supporting structure of the refrigerator, is provided with a plurality of compartments inside;

[0080] A refrigeration system 20, which is arranged in the box, includes a compressor, a condenser, an evaporator and a fan;

[0081] The compressor is used to provide power for the refrigeration cycle of the refrigerator, compressing the low-temperature, low-pressure refrigerant into a high-temperature, high-pressure refrigerant gas;

[0082] The condenser is used to condense and dissipate heat of high-temperature, high-pressure refrigerant gas, and cool the high-temperature, high-pressure refrigerant gas into a normal-temperature, high-pressure refrigerant liquid;

[0083] The evaporator is used to evaporate and absorb heat from a normal temperature and high pressure refrigerant liquid, and vaporize the normal temperature and high pressure refrigerant liquid into a low temperature and low pressure gas;

[0084] The fan is used to allow air to enter the evaporator of the refrigerator for heat exchange and to send the heat-released air into the refrigerator compartment;

[0085] A sound pressure sensor 30, which is arranged inside the compressor compartment and is used to detect the sound pressure of the compressor at different frequencies;

[0086] The controller 40 is configured to, during the operation of the refrigerator, determine whether there is abnormal high-frequency resonance noise of the compressor based on the sound pressure of the compressor at different frequencies and the sound pressure peaks at different speeds of the compressor detected by the sound pressure sensor; if it is determined that there is abnormal high-frequency resonance noise of the compressor, adjust the carrier frequency of the compressor until the abnormal high-frequency resonance noise of the compressor is eliminated.

[0087] Specifically, a refrigerator provided in an embodiment of the present invention includes a cabinet 10, a refrigeration system 20, a sound pressure sensor 30 and a controller 40. Figure 2 , Figure 2 It is a structural schematic diagram of a refrigerator body provided by an embodiment of the present invention. The refrigerator in this embodiment has an approximately rectangular shape, and the refrigerator includes a body 10 that defines a storage space. The body 10 serves as a supporting structure of the refrigerator, and is provided with a chamber inside, wherein the chamber includes a component storage cavity for placing components in the refrigerator, such as a compressor, etc., and also includes a storage space for storing food, etc. The storage space can be divided into a plurality of storage rooms (i.e., compartments), and the storage rooms can be configured as a refrigeration room, a freezing room, and a temperature-changing room (also called a fresh-keeping room) according to different uses. One or more door bodies 200 are provided at the opening of each storage room, for example, Figure 2The upper storage room is a cold storage room, which is provided with a double-opening door body. The door body 200 includes a door body outer shell 210 located outside the box body 10, a door body inner liner 220 located inside the box body 10, an upper end cover 230, a lower end cover 240, and an insulation layer located between the door body outer shell 210, the door body inner liner 220, the upper end cover 230, and the lower end cover 240; usually, the insulation layer is filled with foam material. The door body can be pivotally arranged at the opening of the box body, and can also be opened in a drawer-like manner to achieve drawer-like storage.

[0088] The refrigerator performs refrigeration operation through the refrigeration system, providing cold energy to the compartment so as to maintain the compartment at a constant low temperature. Specifically, the refrigeration system of the refrigerator in this embodiment can be a single refrigeration system or a dual refrigeration system. Figure 3 , Figure 3 The single refrigeration system of a refrigerator provided in one embodiment of the present invention is a schematic diagram of the structure. The single refrigeration system of the refrigerator described in the embodiment of the present invention comprises a compressor 1, a condenser 2, an anti-condensation tube 3, a drying filter 4, a capillary tube 5, an evaporator 6 and a gas-liquid separator 7, and the working structure of the refrigeration system includes a compression process, a condensation process, a throttling process and an evaporation process.

[0089] The compression process is as follows: plug in the power cord of the refrigerator, and when the refrigerator needs to be cooled, the compressor 1 starts to work, and the low-temperature and low-pressure refrigerant is sucked into the compressor, compressed into high-temperature and high-pressure superheated gas in the cylinder of the compressor 1, and then discharged to the condenser 2;

[0090] The condensation process is as follows: the high-temperature, high-pressure refrigerant gas dissipates heat through the condenser 2, the temperature continues to drop, and is gradually cooled to a saturated vapor at room temperature and high pressure, and further cooled to a saturated liquid, the temperature no longer drops. The temperature at this time is called the condensation temperature, and the pressure of the refrigerant remains almost unchanged during the entire condensation process;

[0091] The throttling process is as follows: the condensed refrigerant saturated liquid is filtered through the drying filter 4 to remove moisture and impurities and then flows into the capillary 5, through which the throttling and pressure reduction are carried out, and the refrigerant becomes wet steam at room temperature and low pressure;

[0092] The evaporation process is as follows: the refrigerant begins to absorb heat and vaporize in the evaporator 6, which not only reduces the temperature of the evaporator and its surroundings, but also turns the refrigerant into a low-temperature, low-pressure gas. The refrigerant coming out of the evaporator 6 passes through the gas-liquid separator 7 and returns to the compressor 1 again. The above process is repeated to transfer the heat in the refrigerator to the air outside the box, thereby achieving the purpose of refrigeration.

[0093] The fan allows air to continuously enter the fins of the evaporator 6 for heat exchange, and at the same time sends the air that becomes cold after the evaporator 6 releases heat to the refrigerator room through the air duct, so that the air in the room continuously circulates and flows, achieving the purpose of lowering the temperature.

[0094] See also Figure 4 , Figure 4 : is a structural schematic diagram of a dual refrigeration system of a refrigerator provided by an embodiment of the present invention. The dual refrigeration system of the refrigerator described in the embodiment of the present invention includes a compressor 21 for compressing the refrigerant, a first capillary tube 14a and a second capillary tube 14b for decompressing the refrigerant, a refrigeration evaporator 15a and a freezing evaporator 15b as heat absorption mechanisms, a three-way valve 17 for controlling the refrigerant flow path, a one-way valve 18 for preventing the refrigerant from flowing back, a dryer 19 for removing moisture in the refrigeration cycle, and a refrigerant junction 13 for connecting the refrigerant flow path, which are connected by a pipe 20 to circulate the refrigerant to form a refrigeration cycle. In this process, the fans 12a and 12b respectively provided for each storage room are used to speed up the air flow rate, thereby speeding up the speed at which the refrigeration evaporator and the freezing evaporator absorb heat and improving the refrigeration speed of the storage room. Among them, the three-way valve 17 has a first outflow port 17a and a second outflow port 17b. When the three-way valve 17 is controlled to open the first outflow port 17a, the refrigerant flows sequentially through the first capillary tube 14a, the refrigeration evaporator 15a, the gas-liquid separator 16a, and the refrigerant junction 13, and then returns to the compressor 21. After passing through the first capillary tube 14a, the low-pressure and low-temperature refrigerant flows through the refrigeration evaporator 15a, performs heat exchange with the refrigeration evaporator 15a and the air in the refrigeration chamber 110, and refrigerates the refrigeration chamber 110. Similarly, when the three-way valve 17 is controlled to open the second outflow port 17b, the refrigerant flows sequentially through the second capillary tube 14b, the freezing evaporator 15b, the gas-liquid separator 16b, and the refrigerant junction 13, and then returns to the compressor 21. After passing through the second capillary tube 14b, the low-pressure and low-temperature refrigerant flows through the freezing evaporator 15b, performs heat exchange with the freezing evaporator 15b and the air in the freezing chamber 120, and refrigerates the freezing chamber 120.

[0095] See also Figure 5 , Figure 5 Schematic diagram of the distribution of a sound pressure sensor of a refrigerator provided by an embodiment of the present invention. In the embodiment of the present invention, the sound pressure sensor 30 is used to detect the sound pressure of the compressor at different frequencies. It is arranged inside the compressor compartment and faces the compressor. The number of sound pressure sensors can be set to one or more according to actual needs. Figure 6 , Figure 6This is a first working flow chart of a controller in a refrigerator provided by an embodiment of the present invention. Since the resonance of the compressor may cause the problem of high-frequency noise, the embodiment of the present invention detects the sound pressure of the compressor through a sound pressure sensor, and determines whether there is abnormal high-frequency resonance sound of the compressor according to the sound pressure at different frequencies of the compressor and the sound pressure peak at different frequencies of the compressor at different speeds. If it is determined that there is abnormal high-frequency resonance sound of the compressor, the carrier frequency of the compressor is adjusted until the abnormal high-frequency resonance sound of the compressor is eliminated.

[0096] The embodiment of the present invention arranges a sound pressure sensor inside the compressor compartment to detect the sound pressure of the compressor at different frequencies, thereby identifying the high-frequency resonance abnormal sound of the compressor. After identifying the presence of the high-frequency resonance abnormal sound, the carrier frequency of the compressor is adjusted, thereby eliminating the high-frequency resonance abnormal sound of the compressor, effectively improving the user experience.

[0097] As one of the optional embodiments, judging whether there is a high-frequency resonance abnormal sound of the compressor according to the sound pressure of the compressor at different frequencies and the sound pressure peak value of the compressor at different speeds detected by the sound pressure sensor specifically includes:

[0098] Determining whether there is a high-frequency abnormal sound according to the sound pressure of the compressor at different frequencies detected by the sound pressure sensor;

[0099] If it is determined that the high-frequency abnormal sound exists, the rotation speed of the compressor is adjusted, and whether there is a high-frequency resonance abnormal sound of the compressor is determined based on the sound pressure peak values ​​at different rotation speeds of the compressor.

[0100] Specifically, when determining whether there is high-frequency resonance abnormal noise of the compressor, the embodiment of the present invention first determines whether there is high-frequency abnormal noise based on the sound pressure of the compressor at different frequencies detected by the sound pressure sensor. If it is determined that there is high-frequency abnormal noise, the speed of the compressor is adjusted, and based on the sound pressure peak value at different speeds of the compressor, it is determined whether there is high-frequency resonance abnormal noise of the compressor. It should be noted that the embodiment of the present invention adjusts the speed of the compressor in order to confirm whether the high-frequency abnormal noise is caused by the compressor. Because if the high-frequency abnormal noise is caused by the compressor, the change in the speed of the compressor will affect the frequency of the sound pressure peak. If the high-frequency abnormal noise is not caused by the compressor, it will be excluded when the speed matching is confirmed.

[0101] As one of the optional embodiments, judging whether there is a high-frequency abnormal sound according to the sound pressure of the compressor at different frequencies detected by the sound pressure sensor specifically includes:

[0102] Performing one-third octave band processing on the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor to obtain an unweighted one-third octave band spectrum diagram;

[0103] Performing A-weighting processing on the unweighted one-third octave band spectrum to obtain an A-weighted one-third octave band spectrum;

[0104] If there is an abnormal sound pressure peak in the A-weighted one-third octave spectrum, it is determined that the high-frequency abnormal sound exists.

[0105] For details, please refer to Figure 7 , Figure 7 This is a second working flowchart of a controller in a refrigerator provided by an embodiment of the present invention. The embodiment of the present invention performs one-third octave band processing on the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor to facilitate data viewing, thereby obtaining an unweighted one-third octave band spectrum diagram. The unweighted one-third octave band spectrum diagram is then A-weighted to obtain an A-weighted one-third octave band spectrum diagram. A-weighting is to calculate each frequency based on the perception of the human ear, which is most in line with human feelings. Ordinary data may be high, but people are not sensitive to it. If there is an abnormal sound pressure peak in the A-weighted one-third octave band spectrum diagram, it is determined that there is a high-frequency abnormal sound. For example, please refer to Figure 8 , Figure 8 The present invention provides an A-weighted one-third octave spectrum diagram of the sound pressure of a compressor in a refrigerator according to an embodiment of the present invention. Figure 8 middle,

[0106] P 6300 +3≤P 10000

[0107] P 8000 +3≤P 10000

[0108] P 12500 +5≤P 10000

[0109] This means that in P 10000 There is an abnormal sound pressure peak at the location, and it is determined that there is a high-frequency abnormal sound.

[0110] As one of the optional embodiments, adjusting the speed of the compressor and judging whether there is a high-frequency resonance abnormal sound of the compressor according to the sound pressure peak value at different speeds of the compressor specifically include:

[0111] adjusting the rotation speed of the compressor, performing A-weighting processing on the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor at each rotation speed, and obtaining a sound pressure refinement spectrum;

[0112] Extracting sound pressure peaks greater than a first threshold from the sound pressure refined spectrum, sorting the sound pressure peaks, and calculating differences between adjacent sound pressure peaks;

[0113] Determining whether the difference divided by the current speed of the compressor satisfies a preset condition;

[0114] If the number of preset conditions met reaches a second threshold, it is determined that there is a high-frequency resonance abnormal sound of the compressor.

[0115] Specifically, after determining that there is a high-frequency abnormal sound, the embodiment of the present invention needs to further determine whether the high-frequency abnormal sound is caused by the compressor. Therefore, the embodiment of the present invention adjusts the speed of the compressor, performs A-weighting processing on the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor at each speed, and obtains a sound pressure refinement spectrum such as Fig. 9 As shown, Fig. 9 is a sound pressure refinement spectrum of a compressor in a refrigerator provided by an embodiment of the present invention. A sound pressure peak value P greater than a first threshold is extracted from the sound pressure refinement spectrum. n , that is, P n >P 平均 +2, n represents the frequency of the peak, +2 is a value obtained based on experimental analysis. If it exceeds this value, there may be a high-frequency resonance problem. After obtaining the sound pressure peak, sort the sound pressure peaks and calculate the difference X between adjacent sound pressure peaks. N (large decrease). Divide the difference by the current speed of the compressor, that is, Considering the possible existence of interference items, if the number of items that meet the preset conditions reaches the second threshold, it is determined that there is a high-frequency resonance abnormal sound of the compressor. Is it an integer multiple or close to an integer multiple, for example, 1 times, then the division is 0.9-1.1 can be judged as an integer multiple. T is the current speed of the compressor / 60, for example, 1800 compressor speed, T is 30Hz. Considering the possible interference, as long as more than 80% If it satisfies an integer multiple or close to an integer multiple and changes with the speed, then it can be determined that there is high-frequency resonance noise from the compressor.

[0116] As one of the optional embodiments, adjusting the carrier frequency of the compressor until the high-frequency resonance abnormal sound of the compressor is eliminated specifically includes:

[0117] The carrier frequency is sequentially reduced from an initial value to perform order adjustment, and the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor are processed by one-third octave band to obtain an unweighted one-third octave band spectrum diagram;

[0118] Performing A-weighting processing on the unweighted one-third octave band spectrum to obtain an A-weighted one-third octave band spectrum;

[0119] If there is no abnormal sound pressure peak in the A-weighted one-third octave spectrum, it is determined that the high-frequency resonance noise of the compressor is eliminated, and the current carrier frequency is set to the carrier frequency of the compressor.

[0120] For details, please refer to Fig.10 , Fig.10 It is a third working flow chart of a controller in a refrigerator provided by an embodiment of the present invention. After determining that there is a high-frequency resonance abnormal sound of the compressor, the embodiment of the present invention adjusts the order of the carrier frequency from the initial value of 5000Hz to 4000Hz by 100Hz in sequence, and identifies the high-frequency abnormal sound. Because the high-frequency resonance problem of the compressor caused by the carrier frequency can be well improved by adjusting the carrier frequency, there may be multiple carrier frequencies that can properly solve the high-frequency resonance problem of the compressor. Therefore, when obtaining multiple carrier frequencies, the embodiment of the present invention preferentially selects the structure with the highest carrier frequency, because the higher the carrier frequency, the higher the control accuracy of the compressor speed. Therefore, the high carrier frequency is the preferred choice of the embodiment of the present invention. The process of identifying high-frequency abnormal sound is the same as the process of determining whether there is a high-frequency abnormal sound in the above text. The sound pressure data of the compressor at different frequencies detected by the sound pressure sensor is processed by one-third octave band to obtain an unweighted one-third octave band spectrum diagram. Then the unweighted one-third octave band spectrum diagram is A-weighted to obtain an A-weighted one-third octave band spectrum diagram. If there is no abnormal sound pressure peak in the A-weighted one-third octave spectrum, it is determined that the high-frequency resonance noise of the compressor has been eliminated, and the current carrier frequency is set as the carrier frequency of the compressor.

[0121] As one of the optional embodiments, the controller is further configured to:

[0122] When it is determined that the high-frequency resonance abnormal sound of the compressor is eliminated, switching the operation mode of the compressor to a stable operation mode;

[0123] If the compressor is not detected to be shut down within the first preset time, the rotation speed of the compressor is increased to continue to maintain the stable operation mode.

[0124] If the compressor is detected to be shut down within the first preset time, the operation mode of the compressor is switched to a defrost mode;

[0125] If the compressor in the defrost mode is not detected to be shut down within the second preset time, the speed of the compressor is increased to continue to maintain the defrost mode;

[0126] If it is detected that the compressor in the defrost mode stops within the second preset time, the current speed of the compressor is set to the periodic operation speed;

[0127] Wherein, the first preset time is less than the second preset time; and the speed of the compressor in the stable operation mode is less than the speed of the compressor in the defrost mode.

[0128] For details, please refer to Fig.11 , Fig.11 It is the fourth working flow chart of a controller in a refrigerator provided by an embodiment of the present invention. In the embodiment of the present invention, after determining that the high-frequency resonance abnormal sound of the compressor is eliminated, the operation mode of the compressor is switched to the stable operation mode. If the compressor is not detected to be shut down within the first preset time t1, it means that there is a problem with the refrigeration of the refrigerator. At this time, it is necessary to increase the speed of the compressor, for example, increase the speed by 5Hz, and continue to maintain the stable operation mode. If the compressor is detected to be shut down within the first preset time t1, the operation mode of the compressor is switched to the defrost mode. If the compressor in the defrost mode is not detected to be shut down within the second preset time t2, that is, the defrost recovery period, it means that the temperature in the compartment rises due to heating during the defrost period. At this time, it is necessary to increase the speed of the compressor, for example, increase the speed by 5Hz, and continue to maintain the defrost mode. If the compressor in the defrost mode is detected to be shut down within the second preset time t2, the current speed of the compressor is set to the periodic operation speed. Among them, the first preset time t1 is less than the second preset time t2, because t2 is the defrost recovery period, that is, the compressor operation cycle after the defrost period. The compressor will use a high speed to compensate for the temperature increase in the compartment caused by heating during the defrost period, so the operation cycle of the defrost recovery period is also relatively longer, so t2>t1. The speed of the compressor in the stable operation mode is less than the speed of the compressor in the defrost mode.

[0129] It should be noted that the reason why the rotation speed is adjusted later in the embodiment of the present invention is to avoid the loss of refrigerator refrigeration effect due to inaccurate rotation speed caused by the reduction of carrier frequency. At the same time, the switching of carrier frequency is determined after the high-frequency abnormal sound is identified, and the confirmation of rotation speed refrigeration performance needs to be performed again at different ambient temperatures. This is because different ambient temperatures require different refrigeration performance and different rotation speeds are used. In order to ensure the refrigeration performance of the product, the rotation speed at different ambient temperatures needs to be confirmed again.

[0130] The embodiment of the present invention also provides a refrigerator noise reduction method, which is applied to a refrigerator including a box, a refrigeration system and a sound pressure sensor; wherein a plurality of compartments are arranged inside the box; the refrigeration system includes a compressor, a condenser, an evaporator and a fan; the compressor is used to provide power for the refrigeration cycle of the refrigerator, compressing the low-temperature, low-pressure refrigerant into a high-temperature, high-pressure refrigerant gas; the condenser is used to condense and dissipate heat for the high-temperature, high-pressure refrigerant gas, and cool the high-temperature, high-pressure refrigerant gas into a normal-temperature, high-pressure refrigerant liquid; the evaporator is used to evaporate and absorb heat for the normal-temperature, high-pressure refrigerant liquid, and vaporize the normal-temperature, high-pressure refrigerant liquid into a low-temperature, low-pressure gas; the fan is used to allow air to enter the evaporator of the refrigerator for heat exchange and send the heat-released air to the refrigerator compartment; the sound pressure sensor is arranged inside the compressor compartment, and is used to detect the sound pressure of the compressor at different frequencies. The refrigerator noise reduction method includes:

[0131] S1, during the operation of the refrigerator, judging whether there is a high-frequency resonance abnormal sound of the compressor according to the sound pressure of the compressor at different frequencies and the sound pressure peak value of the compressor at different speeds detected by the sound pressure sensor;

[0132] S2: If it is determined that the compressor has a high-frequency resonance abnormal sound, the carrier frequency of the compressor is adjusted until the high-frequency resonance abnormal sound of the compressor is eliminated.

[0133] Since the resonance of the compressor can cause the problem of high-frequency noise, the embodiment of the present invention detects the sound pressure of the compressor through a sound pressure sensor, and determines whether there is abnormal high-frequency resonance sound of the compressor based on the sound pressure at different frequencies of the compressor and the sound pressure peaks at different frequencies of the compressor at different speeds. If it is determined that there is abnormal high-frequency resonance sound of the compressor, the carrier frequency of the compressor is adjusted until the abnormal high-frequency resonance sound of the compressor is eliminated. The embodiment of the present invention arranges a sound pressure sensor inside the compressor compartment to detect the sound pressure at different frequencies of the compressor, and identifies the abnormal high-frequency resonance sound of the compressor. After identifying the presence of abnormal high-frequency resonance sound, the carrier frequency of the compressor is adjusted, thereby eliminating the abnormal high-frequency resonance sound of the compressor, effectively improving the user experience.

[0134] As one of the optional embodiments, judging whether there is a high-frequency resonance abnormal sound of the compressor according to the sound pressure of the compressor at different frequencies and the sound pressure peak value of the compressor at different speeds detected by the sound pressure sensor specifically includes:

[0135] Determining whether there is a high-frequency abnormal sound according to the sound pressure of the compressor at different frequencies detected by the sound pressure sensor;

[0136] If it is determined that the high-frequency abnormal sound exists, the rotation speed of the compressor is adjusted, and whether there is a high-frequency resonance abnormal sound of the compressor is determined based on the sound pressure peak values ​​at different rotation speeds of the compressor.

[0137] Specifically, when determining whether there is high-frequency resonance abnormal noise of the compressor, the embodiment of the present invention first determines whether there is high-frequency abnormal noise based on the sound pressure of the compressor at different frequencies detected by the sound pressure sensor. If it is determined that there is high-frequency abnormal noise, the speed of the compressor is adjusted, and based on the sound pressure peak value at different speeds of the compressor, it is determined whether there is high-frequency resonance abnormal noise of the compressor. It should be noted that the embodiment of the present invention adjusts the speed of the compressor in order to confirm whether the high-frequency abnormal noise is caused by the compressor. Because if the high-frequency abnormal noise is caused by the compressor, the change in the speed of the compressor will affect the frequency of the sound pressure peak. If the high-frequency abnormal noise is not caused by the compressor, it will be excluded when the speed matching is confirmed.

[0138] As one of the optional embodiments, judging whether there is a high-frequency abnormal sound according to the sound pressure of the compressor at different frequencies detected by the sound pressure sensor specifically includes:

[0139] Performing one-third octave band processing on the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor to obtain an unweighted one-third octave band spectrum diagram;

[0140] Performing A-weighting processing on the unweighted one-third octave band spectrum to obtain an A-weighted one-third octave band spectrum;

[0141] If there is an abnormal sound pressure peak in the A-weighted one-third octave spectrum, it is determined that the high-frequency abnormal sound exists.

[0142] Specifically, the embodiment of the present invention performs one-third octave band processing on the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor to facilitate data viewing and obtain an unweighted one-third octave band spectrum. The unweighted one-third octave band spectrum is then A-weighted to obtain an A-weighted one-third octave band spectrum. A-weighting calculates each frequency based on the perception of the human ear and is most consistent with human feelings. Ordinary data may be high, but people are not sensitive to it. If there is an abnormal sound pressure peak in the A-weighted one-third octave band spectrum, it is determined that there is a high-frequency abnormal sound.

[0143] As one of the optional embodiments, adjusting the speed of the compressor and judging whether there is a high-frequency resonance abnormal sound of the compressor according to the sound pressure peak value at different speeds of the compressor specifically include:

[0144] adjusting the rotation speed of the compressor, performing A-weighting processing on the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor at each rotation speed, and obtaining a sound pressure refinement spectrum;

[0145] Extracting sound pressure peaks greater than a first threshold from the sound pressure refined spectrum, sorting the sound pressure peaks, and calculating differences between adjacent sound pressure peaks;

[0146] Determining whether the difference divided by the current speed of the compressor satisfies a preset condition;

[0147] If the number of preset conditions met reaches a second threshold, it is determined that there is a high-frequency resonance abnormal sound of the compressor.

[0148] Specifically, after determining that there is a high-frequency abnormal sound, the embodiment of the present invention needs to further determine whether the high-frequency abnormal sound is caused by the compressor. Therefore, the embodiment of the present invention adjusts the speed of the compressor, performs A-weighting processing on the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor at each speed, and obtains a sound pressure refinement spectrum. The sound pressure peak value P greater than the first threshold is extracted from the sound pressure refinement spectrum. n , that is, P n >P 平均 +2, n represents the frequency of the peak, +2 is a value obtained based on experimental analysis. If it exceeds this value, there may be a high-frequency resonance problem. After obtaining the sound pressure peak, sort the sound pressure peaks and calculate the difference X between adjacent sound pressure peaks. N (large decrease). Divide the difference by the current speed of the compressor, that is, Considering the possible existence of interference items, if the number of items that meet the preset conditions reaches the second threshold, it is determined that there is a high-frequency resonance abnormal sound of the compressor. Is it an integer multiple or close to an integer multiple, for example, 1 times, then the division is 0.9-1.1 can be judged as an integer multiple. T is the current speed of the compressor / 60, for example, 1800 compressor speed, T is 30Hz. Considering the possible interference, as long as more than 80% If it satisfies an integer multiple or close to an integer multiple and changes with the speed, then it can be determined that there is high-frequency resonance noise from the compressor.

[0149] As one of the optional embodiments, adjusting the carrier frequency of the compressor until the high-frequency resonance abnormal sound of the compressor is eliminated specifically includes:

[0150] The carrier frequency is sequentially reduced from an initial value to perform order adjustment, and the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor are processed by one-third octave band to obtain an unweighted one-third octave band spectrum diagram;

[0151] Performing A-weighting processing on the unweighted one-third octave band spectrum to obtain an A-weighted one-third octave band spectrum;

[0152] If there is no abnormal sound pressure peak in the A-weighted one-third octave spectrum, it is determined that the high-frequency resonance noise of the compressor is eliminated, and the current carrier frequency is set to the carrier frequency of the compressor.

[0153] Specifically, after determining that there is a high-frequency resonance abnormal sound of the compressor, the embodiment of the present invention adjusts the carrier frequency from the initial value of 5000Hz to 4000Hz by 100Hz in sequence, and identifies the high-frequency abnormal sound. Because the high-frequency resonance problem of the compressor caused by the carrier frequency can be well improved by adjusting the carrier frequency, there may be multiple carrier frequencies that can properly solve the high-frequency resonance problem of the compressor. Therefore, when obtaining multiple carrier frequencies, the embodiment of the present invention preferentially selects the structure with the highest carrier frequency, because the higher the carrier frequency, the higher the control accuracy of the compressor speed, so the high carrier frequency is the preferred choice of the embodiment of the present invention. The process of identifying high-frequency abnormal sound is the same as the process of determining whether there is a high-frequency abnormal sound in the above text. The sound pressure data of the compressor at different frequencies detected by the sound pressure sensor is processed by one-third octave band to obtain an unweighted one-third octave band spectrum. Then, the unweighted one-third octave band spectrum is A-weighted to obtain an A-weighted one-third octave band spectrum. If there is no abnormal sound pressure peak in the A-weighted one-third octave band spectrum, it is determined that the high-frequency resonance abnormal sound of the compressor is eliminated, and the current carrier frequency is set to the carrier frequency of the compressor.

[0154] As an optional embodiment, the method further includes:

[0155] When it is determined that the high-frequency resonance abnormal sound of the compressor is eliminated, switching the operation mode of the compressor to a stable operation mode;

[0156] If the compressor is not detected to be shut down within the first preset time, the rotation speed of the compressor is increased to continue to maintain the stable operation mode.

[0157] If the compressor is detected to be shut down within the first preset time, the operation mode of the compressor is switched to a defrost mode;

[0158] If the compressor in the defrost mode is not detected to be shut down within the second preset time, the speed of the compressor is increased to continue to maintain the defrost mode;

[0159] If it is detected that the compressor in the defrost mode stops within the second preset time, the current speed of the compressor is set to the periodic operation speed;

[0160] Wherein, the first preset time is less than the second preset time; and the speed of the compressor in the stable operation mode is less than the speed of the compressor in the defrost mode.

[0161] Specifically, the embodiment of the present invention switches the operation mode of the compressor to the stable operation mode after determining that the high-frequency resonance abnormal sound of the compressor has been eliminated. If the compressor is not detected to be shut down within the first preset time t1, it means that there is a problem with the refrigeration of the refrigerator. At this time, it is necessary to increase the speed of the compressor, for example, increase the speed by 5Hz, and continue to maintain the stable operation mode. If the compressor is detected to be shut down within the first preset time t1, the operation mode of the compressor is switched to the defrost mode. If the compressor in the defrost mode is not detected to be shut down within the second preset time t2, that is, the defrost recovery period, it means that the temperature in the room has increased due to heating during the defrost period. At this time, it is necessary to increase the speed of the compressor, for example, increase the speed by 5Hz, and continue to maintain the defrost mode. If the compressor in the defrost mode is detected to be shut down within the second preset time t2, the current speed of the compressor is set to the periodic operation speed. Among them, the first preset time t1 is less than the second preset time t2, because t2 is the defrost recovery period, that is, the compressor operation cycle after the defrost period. The compressor will use a high speed to compensate for the temperature increase in the compartment caused by heating during the defrost period, so the operation cycle of the defrost recovery period is also relatively longer, so t2>t1. The speed of the compressor in the stable operation mode is less than the speed of the compressor in the defrost mode.

[0162] The embodiment of the present invention provides a refrigerator and a noise reduction method thereof, wherein a sound pressure sensor is arranged inside the compressor compartment to detect the sound pressure of the compressor at different frequencies. During the operation of the refrigerator, it is determined whether there is a high-frequency resonance abnormal sound of the compressor based on the sound pressure of the compressor at different frequencies detected by the sound pressure sensor and the sound pressure peak value of the compressor at different speeds; if it is determined that there is a high-frequency resonance abnormal sound of the compressor, the carrier frequency of the compressor is adjusted until the high-frequency resonance abnormal sound of the compressor is eliminated. The embodiment of the present invention eliminates the high-frequency resonance abnormal sound of the compressor by identifying the high-frequency resonance abnormal sound of the compressor and adjusting the carrier frequency of the compressor after identifying the presence of the high-frequency resonance abnormal sound, thereby effectively improving the user experience.

[0163] It should be noted that the system embodiment described above is merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the drawings of the system embodiment provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art may understand and implement it without paying any creative effort.

[0164] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A refrigerator, characterized in that: include: The box body, which serves as the supporting structure of the refrigerator, has several compartments inside; A refrigeration system, which is arranged in the box, includes a compressor, a condenser, an evaporator and a fan; The compressor is used to provide power for the refrigeration cycle of the refrigerator, compressing the low-temperature, low-pressure refrigerant into a high-temperature, high-pressure refrigerant gas; The condenser is used to condense and dissipate heat of high-temperature, high-pressure refrigerant gas, and cool the high-temperature, high-pressure refrigerant gas into a normal-temperature, high-pressure refrigerant liquid; The evaporator is used to evaporate and absorb heat from a normal temperature and high pressure refrigerant liquid, and vaporize the normal temperature and high pressure refrigerant liquid into a low temperature and low pressure gas; The fan is used to allow air to enter the evaporator of the refrigerator for heat exchange and to send the heat-released air into the refrigerator compartment; A sound pressure sensor is disposed inside the compressor compartment and is used to detect the sound pressure of the compressor at different frequencies; The controller is configured to, during the operation of the refrigerator, determine whether there is a high-frequency resonance abnormal sound of the compressor according to the sound pressure of the compressor at different frequencies and the sound pressure peaks at different speeds of the compressor detected by the sound pressure sensor; If it is determined that the compressor has a high-frequency resonance abnormal sound, the carrier frequency of the compressor is adjusted until the high-frequency resonance abnormal sound of the compressor is eliminated.

2. The refrigerator according to claim 1, characterized in that: The determining whether there is a high-frequency resonance abnormal sound of the compressor according to the sound pressure of the compressor at different frequencies and the sound pressure peaks of the compressor at different speeds detected by the sound pressure sensor specifically includes: Determining whether there is a high-frequency abnormal sound according to the sound pressure of the compressor at different frequencies detected by the sound pressure sensor; If it is determined that the high-frequency abnormal sound exists, the rotation speed of the compressor is adjusted, and whether there is a high-frequency resonance abnormal sound of the compressor is determined based on the sound pressure peak values ​​at different rotation speeds of the compressor.

3. The refrigerator according to claim 2, characterized in that: The determining whether there is a high-frequency abnormal sound according to the sound pressure of the compressor at different frequencies detected by the sound pressure sensor specifically includes: Performing one-third octave band processing on the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor to obtain an unweighted one-third octave band spectrum diagram; Performing A-weighting processing on the unweighted one-third octave band spectrum to obtain an A-weighted one-third octave band spectrum; If there is an abnormal sound pressure peak in the A-weighted one-third octave spectrum, it is determined that the high-frequency abnormal sound exists.

4. The refrigerator according to claim 3, characterized in that: The adjusting the speed of the compressor and judging whether there is a high-frequency resonance abnormal sound of the compressor according to the sound pressure peaks at different speeds of the compressor specifically include: adjusting the rotation speed of the compressor, performing A-weighting processing on the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor at each rotation speed, and obtaining a sound pressure refinement spectrum; Extracting sound pressure peaks greater than a first threshold from the sound pressure refined spectrum, sorting the sound pressure peaks, and calculating differences between adjacent sound pressure peaks; Determining whether the difference divided by the current speed of the compressor satisfies a preset condition; If the number of preset conditions met reaches a second threshold, it is determined that there is a high-frequency resonance abnormal sound of the compressor.

5. The refrigerator according to claim 4, characterized in that: The adjusting the carrier frequency of the compressor until the high-frequency resonance abnormal sound of the compressor is eliminated specifically includes: The carrier frequency is sequentially reduced from an initial value to perform order adjustment, and the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor are processed by one-third octave band to obtain an unweighted one-third octave band spectrum diagram; Performing A-weighting processing on the unweighted one-third octave band spectrum to obtain an A-weighted one-third octave band spectrum; If there is no abnormal sound pressure peak in the A-weighted one-third octave spectrum, it is determined that the high-frequency resonance noise of the compressor is eliminated, and the current carrier frequency is set to the carrier frequency of the compressor.

6. The refrigerator according to claim 5, characterized in that: The controller is also configured to: When it is determined that the high-frequency resonance abnormal sound of the compressor is eliminated, switching the operation mode of the compressor to a stable operation mode; If the compressor is not detected to be shut down within the first preset time, the speed of the compressor is increased to continue to maintain the stable operation mode; If the compressor is detected to be shut down within the first preset time, the operation mode of the compressor is switched to a defrost mode; If the compressor in the defrost mode is not detected to be shut down within the second preset time, the speed of the compressor is increased to continue to maintain the defrost mode; If it is detected that the compressor in the defrost mode stops within the second preset time, the current speed of the compressor is set to the periodic operation speed; Wherein, the first preset time is less than the second preset time; The rotation speed of the compressor in the stable operation mode is lower than the rotation speed of the compressor in the defrost mode.

7. A refrigerator noise reduction method, characterized in that: The method is applied to a refrigerator including a cabinet, a refrigeration system and a sound pressure sensor; wherein the sound pressure sensor is arranged inside the compressor compartment and is used to detect the sound pressure of the compressor at different frequencies. The refrigerator noise reduction method includes: During the operation of the refrigerator, judging whether there is a high-frequency resonance abnormal sound of the compressor according to the sound pressure of the compressor at different frequencies and the sound pressure peaks of the compressor at different speeds detected by the sound pressure sensor; If it is determined that the compressor has a high-frequency resonance abnormal sound, the carrier frequency of the compressor is adjusted until the high-frequency resonance abnormal sound of the compressor is eliminated.

8. The refrigerator noise reduction method according to claim 7, characterized in that: The determining whether there is a high-frequency resonance abnormal sound of the compressor according to the sound pressure of the compressor at different frequencies and the sound pressure peaks of the compressor at different speeds detected by the sound pressure sensor specifically includes: Determining whether there is a high-frequency abnormal sound according to the sound pressure of the compressor at different frequencies detected by the sound pressure sensor; If it is determined that the high-frequency abnormal sound exists, the rotation speed of the compressor is adjusted, and whether there is a high-frequency resonance abnormal sound of the compressor is determined based on the sound pressure peak values ​​at different rotation speeds of the compressor.

9. The refrigerator noise reduction method according to claim 8, characterized in that: The determining whether there is a high-frequency abnormal sound according to the sound pressure of the compressor at different frequencies detected by the sound pressure sensor specifically includes: Performing one-third octave band processing on the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor to obtain an unweighted one-third octave band spectrum diagram; Performing A-weighting processing on the unweighted one-third octave band spectrum to obtain an A-weighted one-third octave band spectrum; If there is an abnormal sound pressure peak in the A-weighted one-third octave spectrum, it is determined that the high-frequency abnormal sound exists.

10. The refrigerator noise reduction method according to claim 9, characterized in that: The adjusting the speed of the compressor and judging whether there is a high-frequency resonance abnormal sound of the compressor according to the sound pressure peaks at different speeds of the compressor specifically include: adjusting the rotation speed of the compressor, performing A-weighting processing on the sound pressure data of the compressor at different frequencies detected by the sound pressure sensor at each rotation speed, and obtaining a sound pressure refinement spectrum; Extracting sound pressure peaks greater than a first threshold from the sound pressure refined spectrum, sorting the sound pressure peaks, and calculating differences between adjacent sound pressure peaks; Determine whether the difference divided by the current rotation speed of the compressor meets a preset condition; if the number of times the preset condition is met reaches a second threshold, determine that there is a high-frequency resonance abnormal sound of the compressor.

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