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, an environment temperature sensor, a loudspeaker 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 environment temperature sensor is arranged on the box body and is used for detecting the environment temperature; the loudspeaker is arranged on the box body and is used for playing masking sound to reduce noise; the controller is configured to obtain the running state of the refrigerator and the environment temperature detected by the environment temperature sensor during the automatic door opening and closing running period of the refrigerator. And selecting a target masking sound from a plurality of preset masking sounds according to the running state and the environment temperature, and controlling a loudspeaker to play the target masking sound. The operation state of the refrigerator is considered on the basis of the sound masking technology, sound masking is conducted on the automatic door opening and closing conditions under different operation states and environment temperatures, and therefore noise generated when the door of the refrigerator is automatically opened and closed is reduced, and 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] As people's living standards continue to improve, smart home has become an inevitable development trend. As an indispensable tool for modern home life, refrigerators have become an important part of smart home. Users have higher and higher requirements for the intelligence and performance of refrigerators. At present, refrigerators with automatic door opening and closing have gradually entered users' homes. However, the motor of the automatic door opening and closing refrigerator has a large noise. This noise is easily perceived by users due to its sharp characteristics, which seriously affects the user experience. 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, which takes into account the operating state of the refrigerator based on sound masking technology, and performs sound masking on the automatic opening and closing of the door under different operating states and ambient temperatures, thereby reducing the noise when the refrigerator automatically opens and closes the door, 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] An ambient temperature sensor is provided on the box body and is used to detect the ambient temperature;

[0012] A speaker, which is disposed on the box and is used to play a masking sound to reduce noise;

[0013] The controller is configured to, during the automatic opening and closing of the refrigerator door, obtain the operating state of the refrigerator and the ambient temperature detected by the ambient temperature sensor; select a target masking sound from a plurality of preset masking sounds according to the operating state and the ambient temperature, and control the speaker to play the target masking sound.

[0014] In the refrigerator provided by the second embodiment of the present invention, the step of selecting a target masking sound from a plurality of preset masking sounds according to the operating state and the ambient temperature, and controlling the speaker to play the target masking sound specifically includes:

[0015] When the operating state is stable operation, obtaining a first rotation speed of the compressor in stable operation;

[0016] A target masking sound is selected from a plurality of preset first masking sounds according to the first rotation speed and the ambient temperature, and the speaker is controlled to play the target masking sound.

[0017] In the refrigerator provided by the third embodiment of the present invention, the step of selecting a target masking sound from a plurality of preset masking sounds according to the operating state and the ambient temperature, and controlling the speaker to play the target masking sound specifically includes:

[0018] When the operating state is in the defrost recovery period, obtaining a second speed of the compressor in the defrost recovery period;

[0019] A target masking sound is selected from a plurality of preset second masking sounds according to the second rotation speed and the ambient temperature, and the speaker is controlled to play the target masking sound.

[0020] In the refrigerator provided by the fourth embodiment of the present invention, the step of selecting a target masking sound from a plurality of preset masking sounds according to the operating state and the ambient temperature, and controlling the speaker to play the target masking sound specifically includes:

[0021] When the operation state is the first power-on operation, obtaining a third speed of the compressor during the first power-on operation;

[0022] According to the third rotation speed and the ambient temperature, a target masking sound is selected from a plurality of preset third masking sounds, and the speaker is controlled to play the target masking sound; wherein the second masking sound is greater than the first masking sound, and the third masking sound is greater than the first masking sound.

[0023] In the refrigerator provided in the fifth embodiment of the present invention, the controller is further configured as follows:

[0024] When the operating state is stable operation, the speaker is controlled to self-adjust and play the target masking sound according to the first rotation speed, and the target masking sound is linearly correlated with the remaining door closing time from large to small.

[0025] A refrigerator noise reduction method provided in a sixth embodiment of the present invention is applied to a refrigerator including a cabinet, a refrigeration system, an ambient temperature sensor, and a speaker; wherein the ambient temperature sensor is provided on the cabinet to detect the ambient temperature; the speaker is provided on the cabinet to play a masking sound to reduce noise, and the refrigerator noise reduction method includes:

[0026] During the automatic opening and closing of the refrigerator door, obtaining the operating state of the refrigerator and the ambient temperature detected by the ambient temperature sensor;

[0027] A target masking sound is selected from a plurality of preset masking sounds according to the operating state and the ambient temperature, and the speaker is controlled to play the target masking sound.

[0028] In the refrigerator noise reduction method provided by the seventh embodiment of the present invention, the target masking sound is selected from a plurality of preset masking sounds according to the operating state and the ambient temperature, and the speaker is controlled to play the target masking sound, which specifically includes:

[0029] When the operating state is stable operation, obtaining a first rotation speed of the compressor in stable operation;

[0030] A target masking sound is selected from a plurality of preset first masking sounds according to the first rotation speed and the ambient temperature, and the speaker is controlled to play the target masking sound.

[0031] In the refrigerator noise reduction method provided by the eighth embodiment of the present invention, the target masking sound is selected from a plurality of preset masking sounds according to the operating state and the ambient temperature, and the speaker is controlled to play the target masking sound, which specifically includes:

[0032] When the operating state is in the defrost recovery period, obtaining a second speed of the compressor in the defrost recovery period;

[0033] A target masking sound is selected from a plurality of preset second masking sounds according to the second rotation speed and the ambient temperature, and the speaker is controlled to play the target masking sound.

[0034] In the refrigerator noise reduction method provided by the ninth embodiment of the present invention, the step of selecting a target masking sound from a plurality of preset masking sounds according to the operating state and the ambient temperature, and controlling the speaker to play the target masking sound specifically includes:

[0035] When the operation state is the first power-on operation, obtaining a third speed of the compressor during the first power-on operation;

[0036] According to the third rotation speed and the ambient temperature, a target masking sound is selected from a plurality of preset third masking sounds, and the speaker is controlled to play the target masking sound; wherein the second masking sound is greater than the first masking sound, and the third masking sound is greater than the first masking sound.

[0037] In the refrigerator noise reduction method provided in the tenth embodiment of the present invention, the method further includes:

[0038] When the operating state is stable operation, the speaker is controlled to self-adjust and play the target masking sound according to the first rotation speed, and the target masking sound is linearly correlated with the remaining door closing time from large to small.

[0039] Compared with the prior art, the refrigerator and the noise reduction method provided by the embodiment of the present invention have the following beneficial effects: during the automatic door opening and closing of the refrigerator, the operating state of the refrigerator and the ambient temperature detected by the ambient temperature sensor are obtained; according to the operating state and the ambient temperature, a target masking sound is selected from a plurality of preset masking sounds, and the speaker is controlled to play the target masking sound. The embodiment of the present invention considers the operating state of the refrigerator based on the sound masking technology, and performs sound masking on the automatic door opening and closing under different operating states and ambient temperatures, thereby reducing the noise when the refrigerator automatically opens and closes the door, and effectively improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a structural schematic diagram of a refrigerator provided by an embodiment of the present invention;

[0041] Figure 2 It is a structural schematic diagram of a refrigerator body provided by one embodiment of the present invention;

[0042] Figure 3 It is a structural schematic diagram of a single refrigeration system of a refrigerator provided by an embodiment of the present invention;

[0043] Figure 4 It is a structural schematic diagram of a dual refrigeration system of a refrigerator provided by an embodiment of the present invention;

[0044] Figure 5 This is a noise spectrum diagram of a refrigerator automatically opening its door in different states provided by an embodiment of the present invention;

[0045] Figure 6 This is a noise spectrum diagram of a refrigerator automatically closing its door in different states provided by an embodiment of the present invention;

[0046] Figure 7 is a first working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0047] Figure 8 is a second working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0048] Fig. 9 is a third working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0049] Fig.10 is a fourth working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0050] Fig.11 This is a fifth working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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:

[0056] The box body 10, which serves as the supporting structure of the refrigerator, is provided with a plurality of compartments inside;

[0057] A refrigeration system 20, which is arranged in the box, includes a compressor, a condenser, an evaporator and a fan;

[0058] 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;

[0059] 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;

[0060] 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;

[0061] 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;

[0062] An ambient temperature sensor 30, which is disposed on the box 10 and is used to detect the ambient temperature;

[0063] A speaker 40, which is disposed on the box 10 and is used to play a masking sound to reduce noise;

[0064] The controller 50 is configured to, during the automatic opening and closing of the refrigerator door, obtain the operating status of the refrigerator and the ambient temperature detected by the ambient temperature sensor; select a target masking sound from a plurality of preset masking sounds according to the operating status and the ambient temperature, and control the speaker to play the target masking sound.

[0065] Specifically, a refrigerator provided in an embodiment of the present invention includes a housing 10, a refrigeration system 20, an ambient temperature sensor 30, a speaker 40, and a controller 50. 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 2 The 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.

[0066] 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.

[0067] 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;

[0068] 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;

[0069] 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;

[0070] 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.

[0071] 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.

[0072] 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.

[0073] In the embodiment of the present invention, the ambient temperature sensor 30 is used to detect the ambient temperature. It should be noted that the ambient temperature sensor 30 does not need to be added additionally. Based on the existing sections of the refrigerator, the required data can be directly extracted from the main control board. The speaker 40 is provided on the cabinet and is used to play masking sounds to reduce noise. The operation of the speaker is controlled by the main control board. The position of the speaker can be set on the display of the refrigerator cabinet panel. The speaker provided by the display can be directly used, or a new speaker can be placed in the drawer of the automatic door.

[0074] See also Figure 5 and Figure 6 , Figure 5 is a noise spectrum diagram of a refrigerator automatically opening its door in different states provided by an embodiment of the present invention. Figure 6 It is a noise spectrum diagram of the automatic door closing of a refrigerator in different states provided by an embodiment of the present invention. By testing the automatic opening and closing of the door in different states, the embodiment of the present invention finds that the noise of the automatic opening and closing of the door is always in a relatively large state, which is easily perceived by the user. Therefore, noise reduction for the automatic opening and closing of the door is necessary. Sound masking technology: The phenomenon that due to the simultaneous existence of two or more sounds, the auditory domain is shifted, resulting in a decrease in the audibility of any one of the sounds. For example, a pure tone with a frequency of 800Hz can be heard by normal people when the sound pressure level is 0dB (if it is lowered further, normal ears will not be able to hear it), that is, the hearing threshold of a pure tone of 800Hz is 0dB. However, in an environment with 70dB of noise, the sound pressure level of a pure tone of 800Hz must be increased to 75dB to be heard, and the decibel increase in the hearing threshold is 75dB (that is, 75dB-0dB). Please refer to Figure 7 , Figure 7 This is a first working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention. During the automatic door opening and closing operation of the refrigerator, the embodiment of the present invention obtains the operating state of the refrigerator and the ambient temperature detected by the ambient temperature sensor. According to the operating state of the refrigerator and the ambient temperature, a target masking sound is selected from a plurality of preset masking sounds, and the speaker is controlled to play the target masking sound.

[0075] The embodiment of the present invention pre-sets several reserve masking sounds based on the basic operating mode of the refrigerator being used. Before playing the masking sound, the current ambient temperature of the refrigerator, the current operating state, and the speed of the compressor used in the operating state are identified, and the type of masking sound to be used is determined based on the compressor speed. Because when the frequency of the masking sound is different, the masking effect that can be produced is also different, therefore, identifying the current operating state of the refrigerator and the current compressor speed, thereby identifying the main frequency range of the current noise, and then using different masking sounds can achieve a better masking effect. It should be noted that because the automatic opening and closing drawer is at the bottom and close to the compressor, what the human ear can perceive is not only the sound of the motor running, but the sound of the motor running and the compressor running superimposed, so it is necessary to identify the current speed of the compressor when the door is opened and closed, and the motor speed remains basically unchanged.

[0076] Illustratively, the speed of the compressor under different ambient temperatures and different operating conditions in the embodiment of the present invention is shown in Table 1 below.

[0077]

[0078]

[0079] Table 1 Compressor speed at different ambient temperatures and under different operating conditions

[0080] Based on Table 1 above, it can be seen that each ambient temperature corresponds to two operating states, namely the stable operating state and the defrost recovery state, that is, there will be two total speed settings under one ambient temperature.

[0081] in:

[0082] ω 化霜 >ω 稳定 ;

[0083] ω 首上电 >ω 稳定 ;

[0084] T1>T2,ω T1 Stable ≥ω T2 Stablize;

[0085] That is, the speed of the compressor at a high ambient temperature is greater than or equal to the speed of the compressor at a low ambient temperature.

[0086] According to different ambient temperatures and the speed of the compressor under different operating conditions, the masking sounds under different ambient temperatures and different operating conditions are preset as shown in Table 2 below.

[0087]

[0088] Table 2 Masking sound under different ambient temperatures and different operating conditions

[0089] Based on Table 2 above, it can be seen that under normal circumstances, there are mainly 6 types of pre-set reserve masking sounds, which are applied to cold product noises under different ambient temperatures and different operating conditions, so that the masking sounds can play the best role.

[0090] It should be noted that for the control specification used for the product model, that is, the compressor speed and ambient temperature relationship table shown above, 6 types of reserve are considered. If the corresponding product model has more speed situations, more reserve sounds will be used. In the above table, although the compressor speeds of P1 and P6 are the same, when the power is first turned on, the refrigerator is hot and the refrigerator load is greater (the refrigerator compartment is hot), and the stable operation is cool (the refrigerator compartment is cool), so the load of the first power-on is greater and the noise is greater, so the same type cannot be used. If the current operating frequency is 60Hz, then the main frequency of the noise is 30Hz (this is because the frequency in the electronic control is twice the frequency in the noise vibration), then the sound of 10Hz above and below 30Hz in the reserve sound will be louder, exceeding the operating sound by more than 5dB, and the sound settings of other frequency bands are mainly based on pleasant listening. For example, you can choose a piece of music, and then this piece of music corresponds to the 30Hz operation, then the 30Hz component of this piece of music can be increased to more than 5dB, and the other components can remain unchanged, or increase adaptively. The specific settings are based on the product sound characteristics tested in the product design stage to mask the sound setting.

[0091] The embodiment of the present invention takes the operating state of the refrigerator into consideration based on the sound masking technology, and performs sound masking on the automatic door opening and closing conditions under different operating states and ambient temperatures, thereby reducing the noise when the refrigerator door is automatically opened and closed, and effectively improving the user experience.

[0092] As one of the optional embodiments, selecting a target masking sound from a plurality of preset masking sounds according to the operating state and the ambient temperature, and controlling the speaker to play the target masking sound specifically includes:

[0093] When the operating state is stable operation, obtaining a first rotation speed of the compressor in stable operation;

[0094] A target masking sound is selected from a plurality of preset first masking sounds according to the first rotation speed and the ambient temperature, and the speaker is controlled to play the target masking sound.

[0095] For details, please refer to Figure 8 , Figure 8This is a second working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention. In the embodiment of the present invention, when the refrigerator is in stable operation, the first speed of the compressor in stable operation is obtained. According to the first speed of the compressor and the ambient temperature, a target masking sound is selected from a plurality of preset first masking sounds, such as P1, P3, and P5, and the speaker is controlled to play the target masking sound.

[0096] As one of the optional embodiments, selecting a target masking sound from a plurality of preset masking sounds according to the operating state and the ambient temperature, and controlling the speaker to play the target masking sound specifically includes:

[0097] When the operating state is in the defrost recovery period, obtaining a second speed of the compressor in the defrost recovery period;

[0098] A target masking sound is selected from a plurality of preset second masking sounds according to the second rotation speed and the ambient temperature, and the speaker is controlled to play the target masking sound.

[0099] For details, please refer to Fig. 9 , Fig. 9 This is a third working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention. In the embodiment of the present invention, when the refrigerator is in the defrost recovery period, the second speed of the compressor in the defrost recovery period is obtained. According to the second speed of the compressor and the ambient temperature, a target masking sound is selected from a plurality of preset second masking sounds, such as P2 and P4, and the speaker is controlled to play the target masking sound.

[0100] As one of the optional embodiments, selecting a target masking sound from a plurality of preset masking sounds according to the operating state and the ambient temperature, and controlling the speaker to play the target masking sound specifically includes:

[0101] When the operation state is the first power-on operation, obtaining a third speed of the compressor during the first power-on operation;

[0102] According to the third rotation speed and the ambient temperature, a target masking sound is selected from a plurality of preset third masking sounds, and the speaker is controlled to play the target masking sound; wherein the second masking sound is greater than the first masking sound, and the third masking sound is greater than the first masking sound.

[0103] For details, please refer to Fig.10 , Fig.10This is a fourth working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention. In the embodiment of the present invention, when the operating state of the refrigerator is the first power-on operation, the third speed of the compressor in the first power-on operation is obtained. According to the third speed of the compressor and the ambient temperature, a target masking sound is selected from a plurality of preset third masking sounds, and the speaker is controlled to play the target masking sound.

[0104] It should be noted that since the compressor speed during the defrost recovery period is greater than the compressor speed during stable operation, the second masking sound is greater than the first masking sound. Since the compressor speed during the first power-on period is greater than the compressor speed during stable operation, the third masking sound is greater than the first masking sound.

[0105] As one of the optional embodiments, the controller is further configured to:

[0106] When the operating state is stable operation, the speaker is controlled to self-adjust and play the target masking sound according to the first rotation speed, and the target masking sound is linearly correlated with the remaining door closing time from large to small.

[0107] Specifically, in the embodiment of the present invention, when the refrigerator is in stable operation, the speaker is controlled to self-adjust and play the target masking sound according to the first speed, that is, the target masking sound is linearly related to the remaining door closing time from loud to small. It should be noted that P1 is not adjusted. Please refer to Fig.11 , Fig.11 This is the fifth working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention. The reason why the current high speed cannot automatically adjust the size of the masking sound is that the body noise of the refrigerator is already very small at a low speed, and even if the masking sound is small, it will not affect the masking effect. However, when the speed is high, if the adjustment is linear, the sound at the end is very likely to have no masking effect, so at high speed, it is necessary to always maintain the set optimal masking sound.

[0108] Furthermore, the setting of the masking sound in the embodiment of the present invention can be divided into the following three forms:

[0109] 1. All masking sounds are of standard volume. The sound design is simple, but since some of the sound levels are self-adjusting and some are masking sounds that maintain a certain volume, it may cause confusion among users and lead to complaints.

[0110] 2. They are all masking sounds that gradually decrease in volume. You can play them directly. The program settings are simple, but the design of masking sounds is more difficult.

[0111] 3. Low speed is P3\P5 standard sound volume, and the rest are masking sounds that gradually decrease with the sound. The sound design and program design are moderate.

[0112] 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, an ambient temperature sensor and a speaker; 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 ambient temperature sensor is arranged on the box for detecting the ambient temperature; the speaker is arranged on the box for playing a masking sound to reduce noise, and the refrigerator noise reduction method includes:

[0113] S1, obtaining the operating state of the refrigerator and the ambient temperature detected by the ambient temperature sensor during the automatic opening and closing of the refrigerator door;

[0114] S2, selecting a target masking sound from a plurality of preset masking sounds according to the operating state and the ambient temperature, and controlling the speaker to play the target masking sound.

[0115] During the automatic door opening and closing operation of the refrigerator, the embodiment of the present invention obtains the operating state of the refrigerator and the ambient temperature detected by the ambient temperature sensor. According to the operating state and ambient temperature of the refrigerator, a target masking sound is selected from a plurality of preset masking sounds, and the speaker is controlled to play the target masking sound. According to the basic operating mode of the refrigerator used, the embodiment of the present invention pre-sets several reserve masking sounds. Before playing the masking sound, the current ambient temperature, the current operating state and the speed of the compressor used in the operating state of the refrigerator are identified, and the masking sound to be used is determined based on the compressor speed. Because the masking effect that can be produced is not nearly the same when the frequency of the masking sound is different, the current operating state of the refrigerator and the current compressor speed are identified, so as to identify the main frequency range of the current noise, and then use different masking sounds, which can achieve a better masking effect. It should be noted that because the automatic opening and closing drawer is close to the compressor at the bottom, what the human ear can perceive is not only the sound of the motor running, but the sound after the motor running and the compressor running are superimposed, so it is necessary to identify the current speed of the compressor when the door is opened and closed, and the motor speed is basically unchanged.

[0116] The embodiment of the present invention takes the operating state of the refrigerator into consideration based on the sound masking technology, and performs sound masking on the automatic door opening and closing conditions under different operating states and ambient temperatures, thereby reducing the noise when the refrigerator door is automatically opened and closed, and effectively improving the user experience.

[0117] As one of the optional embodiments, selecting a target masking sound from a plurality of preset masking sounds according to the operating state and the ambient temperature, and controlling the speaker to play the target masking sound specifically includes:

[0118] When the operating state is stable operation, obtaining a first rotation speed of the compressor in stable operation;

[0119] A target masking sound is selected from a plurality of preset first masking sounds according to the first rotation speed and the ambient temperature, and the speaker is controlled to play the target masking sound.

[0120] Specifically, in the embodiment of the present invention, when the refrigerator is in stable operation, the first speed of the compressor in stable operation is obtained. According to the first speed of the compressor and the ambient temperature, a target masking sound is selected from a plurality of preset first masking sounds, such as P1, P3, and P5, and the speaker is controlled to play the target masking sound.

[0121] As one of the optional embodiments, selecting a target masking sound from a plurality of preset masking sounds according to the operating state and the ambient temperature, and controlling the speaker to play the target masking sound specifically includes:

[0122] When the operating state is in the defrost recovery period, obtaining a second speed of the compressor in the defrost recovery period;

[0123] A target masking sound is selected from a plurality of preset second masking sounds according to the second rotation speed and the ambient temperature, and the speaker is controlled to play the target masking sound.

[0124] Specifically, in the embodiment of the present invention, when the refrigerator is in the defrost recovery period, the second speed of the compressor in the defrost recovery period is obtained. According to the second speed of the compressor and the ambient temperature, a target masking sound is selected from a plurality of preset second masking sounds, such as P2 and P4, and the speaker is controlled to play the target masking sound.

[0125] As one of the optional embodiments, selecting a target masking sound from a plurality of preset masking sounds according to the operating state and the ambient temperature, and controlling the speaker to play the target masking sound specifically includes:

[0126] When the operation state is the first power-on operation, obtaining a third speed of the compressor during the first power-on operation;

[0127] According to the third rotation speed and the ambient temperature, a target masking sound is selected from a plurality of preset third masking sounds, and the speaker is controlled to play the target masking sound; wherein the second masking sound is greater than the first masking sound, and the third masking sound is greater than the first masking sound.

[0128] Specifically, in the embodiment of the present invention, when the refrigerator is in the first power-on operation state, the third speed of the compressor in the first power-on operation is obtained. According to the third speed of the compressor and the ambient temperature, a target masking sound is selected from a plurality of preset third masking sounds, and the speaker is controlled to play the target masking sound.

[0129] It should be noted that since the compressor speed during the defrost recovery period is greater than the compressor speed during stable operation, the second masking sound is greater than the first masking sound. Since the compressor speed during the first power-on period is greater than the compressor speed during stable operation, the third masking sound is greater than the first masking sound.

[0130] As an optional embodiment, the method further includes:

[0131] When the operating state is stable operation, the speaker is controlled to self-adjust and play the target masking sound according to the first rotation speed, and the target masking sound is linearly correlated with the remaining door closing time from large to small.

[0132] Specifically, in an embodiment of the present invention, when the refrigerator is in stable operation, the speaker is controlled to self-adjust and play the target masking sound according to the first rotation speed, that is, the target masking sound is linearly related to the remaining door closing time from large to small. It should be noted that P1 is not adjusted. The current high rotation speed cannot self-adjust the size of the masking sound because the body noise of the refrigerator is already very small at a low rotation speed, and even if the masking sound is small, it will not affect the masking effect. However, when at a high rotation speed, if it is adjusted linearly, the sound at the end is very likely to have no masking effect, so at a high rotation speed, it is necessary to always maintain the set optimal masking sound.

[0133] The embodiment of the present invention provides a refrigerator and a noise reduction method thereof. During the automatic door opening and closing operation of the refrigerator, the operating state of the refrigerator and the ambient temperature detected by the ambient temperature sensor are obtained; according to the operating state and the ambient temperature, a target masking sound is selected from a plurality of preset masking sounds, and the speaker is controlled to play the target masking sound. The embodiment of the present invention considers the operating state of the refrigerator based on the sound masking technology, and performs sound masking on the automatic door opening and closing under different operating states and ambient temperatures, thereby reducing the noise when the refrigerator automatically opens and closes the door, and effectively improving the user experience.

[0134] 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.

[0135] 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; An ambient temperature sensor is provided on the box body and is used to detect the ambient temperature; A speaker, which is disposed on the box and is used to play a masking sound to reduce noise; The controller is configured to, during the automatic opening and closing of the refrigerator door, obtain the operating state of the refrigerator and the ambient temperature detected by the ambient temperature sensor; select a target masking sound from a plurality of preset masking sounds according to the operating state and the ambient temperature, and control the speaker to play the target masking sound.

2. The refrigerator according to claim 1, characterized in that: The step of selecting a target masking sound from a plurality of preset masking sounds according to the operating state and the ambient temperature, and controlling the speaker to play the target masking sound specifically includes: When the operating state is stable operation, obtaining a first rotation speed of the compressor in stable operation; A target masking sound is selected from a plurality of preset first masking sounds according to the first rotation speed and the ambient temperature, and the speaker is controlled to play the target masking sound.

3. The refrigerator according to claim 2, characterized in that: The step of selecting a target masking sound from a plurality of preset masking sounds according to the operating state and the ambient temperature, and controlling the speaker to play the target masking sound specifically includes: When the operating state is in the defrost recovery period, obtaining a second speed of the compressor in the defrost recovery period; A target masking sound is selected from a plurality of preset second masking sounds according to the second rotation speed and the ambient temperature, and the speaker is controlled to play the target masking sound.

4. The refrigerator according to claim 3, characterized in that: The step of selecting a target masking sound from a plurality of preset masking sounds according to the operating state and the ambient temperature, and controlling the speaker to play the target masking sound specifically includes: When the operation state is the first power-on operation, obtaining a third speed of the compressor during the first power-on operation; According to the third rotation speed and the ambient temperature, a target masking sound is selected from a plurality of preset third masking sounds, and the speaker is controlled to play the target masking sound; wherein the second masking sound is greater than the first masking sound, and the third masking sound is greater than the first masking sound.

5. The refrigerator according to claim 2, characterized in that: The controller is also configured to: When the operating state is stable operation, the speaker is controlled to self-adjust and play the target masking sound according to the first rotation speed, and the target masking sound is linearly correlated with the remaining door closing time from large to small.

6. A refrigerator noise reduction method, characterized in that: The method is applied to a refrigerator including a box, a refrigeration system, an ambient temperature sensor and a speaker; wherein the ambient temperature sensor is arranged on the box for detecting the ambient temperature; the speaker is arranged on the box for playing a masking sound to reduce noise, and the refrigerator noise reduction method comprises: During the automatic opening and closing of the refrigerator door, obtaining the operating state of the refrigerator and the ambient temperature detected by the ambient temperature sensor; According to the operating state and the ambient temperature, a target masking sound is selected from a plurality of preset masking sounds, and the speaker is controlled to play the target masking sound.

7. The refrigerator noise reduction method according to claim 6, characterized in that: The step of selecting a target masking sound from a plurality of preset masking sounds according to the operating state and the ambient temperature, and controlling the speaker to play the target masking sound specifically includes: When the operating state is stable operation, obtaining a first rotation speed of the compressor in stable operation; A target masking sound is selected from a plurality of preset first masking sounds according to the first rotation speed and the ambient temperature, and the speaker is controlled to play the target masking sound.

8. The refrigerator noise reduction method according to claim 7, characterized in that: The step of selecting a target masking sound from a plurality of preset masking sounds according to the operating state and the ambient temperature, and controlling the speaker to play the target masking sound specifically includes: When the operating state is in the defrost recovery period, obtaining a second speed of the compressor in the defrost recovery period; A target masking sound is selected from a plurality of preset second masking sounds according to the second rotation speed and the ambient temperature, and the speaker is controlled to play the target masking sound.

9. The refrigerator noise reduction method according to claim 8, characterized in that: The step of selecting a target masking sound from a plurality of preset masking sounds according to the operating state and the ambient temperature, and controlling the speaker to play the target masking sound specifically includes: When the operation state is the first power-on operation, obtaining a third speed of the compressor during the first power-on operation; According to the third rotation speed and the ambient temperature, a target masking sound is selected from a plurality of preset third masking sounds, and the speaker is controlled to play the target masking sound; wherein the second masking sound is greater than the first masking sound, and the third masking sound is greater than the first masking sound.

10. The refrigerator noise reduction method according to claim 7, characterized in that: The method further comprises: When the operating state is stable operation, the speaker is controlled to self-adjust and play the target masking sound according to the first rotation speed, and the target masking sound is linearly correlated with the remaining door closing time from large to small.

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