Refrigerator and vibration reduction control method thereof

Abstract

The invention discloses a refrigerator and a vibration reduction control method thereof.The refrigerator comprises a refrigerator body, a refrigerating system, an acceleration 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 acceleration sensor is arranged in the compressor bin and used for detecting the first acceleration and the second acceleration of the compressor. The controller is configured to calculate the vibration level fall and the resonant frequency at each rotating speed according to the first acceleration and the second acceleration of the compressor at different rotating speeds detected by the acceleration sensor when the refrigerator starts to run; and the target rotating speed of the compressor is determined according to the vibration level fall and the resonant frequency. According to the method, the assembly matching between the compressor and the product is evaluated through the vibration level fall, and the rotating speed of the resonance frequency is avoided through resonance identification, so that the vibration of the compressor is small when the compressor runs at the target rotating speed, and the running noise of the compressor is effectively reduced.

Description

Technical Field

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

[0002] The main source of refrigerator noise is the noise of the compressor and fan during operation, and the noise evaluation for product problems is nominally a sound power evaluation, but the sound power rating is only an objective noise evaluation of the product, and the source of the noise is the vibration of the product structure. If you only focus on the noise of the product, and do not solve the noise problem of the product from the fundamental aspect - vibration, then you will get half the result with twice the effort, so it is currently necessary to evaluate the vibration reduction design of the product. At present, the vibration control of the compressor is mainly carried out from the structural direction, and the vibration evaluation of the compressor is all natural frequency. These are all for the compressor alone, and there is no vibration control method for matching the compressor installed on the refrigerator with the product. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a refrigerator and a vibration reduction control method thereof, which evaluates the assembly matching between the compressor and the product by the vibration level difference, and avoids the rotation speed of the resonance frequency by resonance identification, so that the compressor vibrates less when running at the target speed, effectively reducing the noise during the operation of the compressor.

[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 acceleration sensor disposed inside the compressor compartment and configured to detect a first acceleration and a second acceleration of the compressor;

[0012] The controller is configured to, when the refrigerator starts running, calculate the vibration level difference and the resonance frequency at each speed based on the first acceleration and the second acceleration of the compressor at different speeds detected by the acceleration sensor; and determine the target speed of the compressor based on the vibration level difference and the resonance frequency.

[0013] In the refrigerator provided by the second embodiment of the present invention, the acceleration sensor includes a first acceleration sensor and a second acceleration sensor;

[0014] The first acceleration sensor is disposed at the top of the compressor and is used to detect a first acceleration at the top of the compressor;

[0015] The second acceleration sensor is disposed at the bottom of the compressor and is used to detect a second acceleration of the bottom of the compressor.

[0016] In the refrigerator provided in the third embodiment of the present invention, the calculation formula of the vibration level difference is:

[0017]

[0018] In the formula, L represents the vibration level difference, T top represents the first acceleration, T down Represents the second acceleration.

[0019] In the refrigerator provided by the fourth embodiment of the present invention, the calculating of the resonance frequency according to the first acceleration and the second acceleration of the compressor at different speeds detected by the acceleration sensor specifically includes:

[0020] calculating a first resonance peak according to the first acceleration of the compressor at different rotation speeds detected by the first acceleration sensor;

[0021] calculating a second resonance peak according to the second acceleration of the compressor at a corresponding speed detected by the second acceleration sensor;

[0022] If the frequency corresponding to the first resonance peak is equal to the frequency corresponding to the second resonance peak, the frequency is the resonance frequency.

[0023] In the refrigerator provided by the fifth embodiment of the present invention, determining the target speed of the compressor according to the vibration level difference and the resonance frequency specifically includes:

[0024] Compare the vibration level difference with a preset threshold, screen out the vibration level difference greater than the preset threshold, and determine the rotation speed corresponding to the vibration level difference greater than the preset threshold as a candidate rotation speed;

[0025] The speed corresponding to the resonance frequency is eliminated from the candidate speeds to obtain the target speed of the compressor.

[0026] A vibration reduction control method for a refrigerator provided in a sixth embodiment of the present invention is applied to a refrigerator including a cabinet, a refrigeration system and an acceleration sensor; wherein the refrigeration system includes a compressor, a condenser, an evaporator and a fan; the acceleration sensor is arranged inside the compressor compartment and is used to detect a first acceleration and a second acceleration of the compressor. The vibration reduction control method for the refrigerator includes:

[0027] When the refrigerator starts to run, according to the first acceleration and the second acceleration of the compressor at different speeds detected by the acceleration sensor, the vibration level difference and the resonance frequency at each speed are calculated;

[0028] A target rotation speed of the compressor is determined according to the vibration level difference and the resonance frequency.

[0029] In the vibration reduction control method for a refrigerator provided by a seventh embodiment of the present invention, the acceleration sensor includes a first acceleration sensor and a second acceleration sensor;

[0030] The first acceleration sensor is disposed at the top of the compressor and is used to detect a first acceleration at the top of the compressor;

[0031] The second acceleration sensor is disposed at the bottom of the compressor and is used to detect a second acceleration of the bottom of the compressor.

[0032] In the refrigerator vibration reduction control method provided in the eighth embodiment of the present invention, the vibration level difference is calculated as follows:

[0033]

[0034] In the formula, L represents the vibration level difference, T top represents the first acceleration, T down Represents the second acceleration.

[0035] In the vibration reduction control method for a refrigerator provided by the ninth embodiment of the present invention, the resonant frequency is calculated according to the first acceleration and the second acceleration of the compressor at different speeds detected by the acceleration sensor, specifically comprising:

[0036] calculating a first resonance peak according to the first acceleration of the compressor at different rotation speeds detected by the first acceleration sensor;

[0037] calculating a second resonance peak according to the second acceleration of the compressor at a corresponding speed detected by the second acceleration sensor;

[0038] If the frequency corresponding to the first resonance peak is equal to the frequency corresponding to the second resonance peak, the frequency is the resonance frequency.

[0039] In the vibration reduction control method for a refrigerator provided in the tenth embodiment of the present invention, determining the target speed of the compressor according to the vibration level difference and the resonance frequency specifically includes:

[0040] Compare the vibration level difference with a preset threshold, screen out the vibration level difference greater than the preset threshold, and determine the rotation speed corresponding to the vibration level difference greater than the preset threshold as a candidate rotation speed;

[0041] The speed corresponding to the resonance frequency is eliminated from the candidate speeds to obtain the target speed of the compressor.

[0042] Compared with the prior art, the beneficial effect of a refrigerator and its vibration reduction control method provided by the embodiment of the present invention is that: the first acceleration and the second acceleration of the compressor are detected by an acceleration sensor arranged inside the compressor compartment, and when the refrigerator starts to run, the vibration level difference and the resonance frequency at each speed are calculated according to the first acceleration and the second acceleration of the compressor at different speeds detected by the acceleration sensor; the target speed of the compressor is determined according to the vibration level difference and the resonance frequency. The embodiment of the present invention evaluates the assembly matching between the compressor and the product through the vibration level difference, and avoids the speed of the resonance frequency through resonance identification, so that the compressor vibrates less when running at the target speed, effectively reducing the noise of the compressor during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a structural schematic diagram of a refrigerator provided by an embodiment of the present invention;

[0044] Figure 2 It is a structural schematic diagram of a refrigerator body provided by one embodiment of the present invention;

[0045] Figure 3 It is a structural schematic diagram of a single refrigeration system of a refrigerator provided by an embodiment of the present invention;

[0046] Figure 4 It is a structural schematic diagram of a dual refrigeration system of a refrigerator provided by one embodiment of the present invention;

[0047] Figure 5 is a first working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0048] Figure 6 is a second working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0049] Figure 7is a schematic diagram of the distribution of acceleration sensors of a refrigerator provided by an embodiment of the present invention;

[0050] Figure 8 is a third working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0051] Fig. 9 is a fourth working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0052] Fig.10 It is a flow chart of a vibration reduction control method for a refrigerator provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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:

[0058] The box body 10, which serves as the supporting structure of the refrigerator, is provided with a plurality of compartments inside;

[0059] A refrigeration system 20, which is arranged in the box, includes a compressor, a condenser, an evaporator and a fan;

[0060] 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;

[0061] 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;

[0062] 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;

[0063] 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;

[0064] an acceleration sensor 30, which is disposed inside the compressor compartment and is used to detect a first acceleration and a second acceleration of the compressor;

[0065] The controller 40 is configured to, when the refrigerator starts running, calculate the vibration level difference and the resonance frequency at each speed based on the first acceleration and the second acceleration of the compressor at different speeds detected by the acceleration sensor; and determine the target speed of the compressor based on the vibration level difference and the resonance frequency.

[0066] Specifically, a refrigerator provided in an embodiment of the present invention includes a housing 10, a refrigeration system 20, an acceleration 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.

[0067] 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.

[0068] 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;

[0069] 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;

[0070] 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;

[0071] 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.

[0072] 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 has become 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.

[0073] 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.

[0074] See also Figure 5 , Figure 5It is a first working flow chart of a controller in a refrigerator provided by an embodiment of the present invention. When the refrigerator starts to run, according to the common speed range of the compressor, the compressor is increased from the lowest speed to the highest speed according to the specified increase amount, and the first acceleration and the second acceleration of the compressor at different speeds are detected by the acceleration sensor arranged inside the compressor compartment. For example, the common speed of the compressor is set to 10Hz-75Hz, and the speed of the compressor is increased in steps of 1Hz. Then, according to the first acceleration and the second acceleration of the compressor at different speeds detected by the acceleration sensor, the vibration level drop and the resonance frequency at each speed are calculated, and the vibration level drop evaluation and the resonance frequency evaluation are respectively performed, and the target speed of the compressor is determined according to the vibration level drop and the resonance frequency. If the first acceleration is similar to the second acceleration, the vibration level drop is small and the evaluation is poor; if the vibration level drop is large, the evaluation is good. The embodiment of the present invention can also warn the frequency of the poor vibration level drop evaluation to avoid using the corresponding speed, thereby avoiding the appearance of a poor compressor structure design in the design stage and user complaints after listing. It should be noted that there is no absolute evaluation value for the vibration level drop. Depending on the product, the vibration level drop is correspondingly different. The vibration level drop on the same product can be compared. Since the compressor rubber pad is the main measure for refrigerator products to control the vibration of the compressor, the vibration level drop evaluation here is also an evaluation of the effect of the compressor rubber pad. The assembly matching between the compressor and the product is evaluated by the vibration level drop. For example, according to the operating speed of the compressor, for example, the three speeds of 15, 25, and 35 Hz, if the vibration level drop of 15Hz is low, it means that the first acceleration is similar to the second acceleration, which means that the rubber pad does not play a good role, then the matching is not good. If the output data shows that the vibration level drop of 13Hz or 16Hz is high, it means that the first acceleration is much different from the second acceleration. At this time, the rubber pad can play an effective role, and the speed of the compressor can be selected as 13Hz or 16Hz. The resonance frequency is calculated based on the first acceleration and the second acceleration, and the resonance frequency is the avoidance frequency of the compressor speed. For example, if 15Hz is the resonance frequency, the compressor cannot use this speed, and a similar speed can be used for avoidance. If the user mode uses a 30Hz speed, then select a speed with a high vibration level difference based on (25-35Hz). The control mode will make a comparative recommendation, which is a vibration level difference evaluation. Finally, you can choose a recommended speed, which is the target. At this speed, the vibration level difference is high and the rubber pad can achieve the best vibration reduction effect.

[0075] Please note that Figure 6 , Figure 6This is a second working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention. In order to avoid the influence of vibration of other components, if there is a functional module (such as an ice maker, a vacuum pump) or a bottom cooling fan with large vibration, it should be ensured to be turned off before the refrigerator is started, so as to avoid the influence of vibration of other components.

[0076] The embodiment of the present invention evaluates the assembly matching between the compressor and the product through the vibration level difference, and avoids the rotation speed of the resonance frequency through resonance identification, so that the compressor vibrates less when running at the target speed, effectively reducing the noise of the compressor during operation.

[0077] As one of the optional embodiments, the acceleration sensor includes a first acceleration sensor and a second acceleration sensor;

[0078] The first acceleration sensor is disposed at the top of the compressor and is used to detect a first acceleration at the top of the compressor;

[0079] The second acceleration sensor is disposed at the bottom of the compressor and is used to detect a second acceleration of the bottom of the compressor.

[0080] For details, please refer to Figure 7 , Figure 7 Schematic diagram of the distribution of acceleration sensors of a refrigerator provided in one embodiment of the present invention. In the embodiment of the present invention, the acceleration sensor 30 includes a first acceleration sensor and a second acceleration sensor. The first acceleration sensor is arranged at the top of the compressor, vertically to the ground, and is used to detect the first acceleration of the top of the compressor. The second acceleration sensor is arranged at the bottom of the compressor, vertically to the ground, for example, in the middle position next to the lower bottom plate of the compressor (either left or right), and the second acceleration sensor should be as close to the compressor as possible, and is used to detect the second acceleration of the bottom of the compressor.

[0081] As one of the optional embodiments, the calculation formula of the vibration level difference is:

[0082]

[0083] In the formula, L represents the vibration level difference, T top represents the first acceleration, T down Represents the second acceleration.

[0084] Specifically, the vibration level drop is defined as 20 times the common logarithm of the ratio of the effective value of the vibration response of the vibration isolation system to the effective value of the corresponding basic response. In the embodiment of the present invention, the vibration level drop at each speed is calculated based on the first acceleration (i.e., top acceleration) and the second acceleration (i.e., bottom acceleration) of the compressor at different speeds detected by the acceleration sensor.

[0085] As one of the optional embodiments, calculating the resonance frequency according to the first acceleration and the second acceleration of the compressor at different speeds detected by the acceleration sensor specifically includes:

[0086] calculating a first resonance peak according to the first acceleration of the compressor at different rotation speeds detected by the first acceleration sensor;

[0087] calculating a second resonance peak according to the second acceleration of the compressor at a corresponding speed detected by the second acceleration sensor;

[0088] If the frequency corresponding to the first resonance peak is equal to the frequency corresponding to the second resonance peak, the frequency is the resonance frequency.

[0089] For details, please refer to Figure 8 , Figure 8 This is a third working flow chart of a controller in a refrigerator provided by an embodiment of the present invention. The embodiment of the present invention calculates a first resonance peak based on a first acceleration of the compressor at different rotation speeds detected by a first acceleration sensor. The second resonance peak is calculated based on a second acceleration of the compressor at a corresponding rotation speed detected by a second acceleration sensor. If the frequency corresponding to the first resonance peak is equal to the frequency corresponding to the second resonance peak, the frequency is the resonance frequency. Exemplarily, the embodiment of the present invention evaluates the measured acceleration peak value by the acceleration sensors located at the top and bottom of the compressor to determine the resonance peak.

[0090] T (f-3) >T f <T (f+3) ;

[0091] If the above formula is satisfied, it is determined to be the resonance peak measured at the position. In the formula, T is the acceleration of the current frequency, and f is the current frequency in Hz.

[0092] If the first acceleration sensor (ie, the top acceleration sensor) and the second acceleration sensor (ie, the bottom acceleration sensor) are both determined to be resonance peaks at the same frequency, then the frequency is determined to be the resonance frequency.

[0093] As one of the optional embodiments, determining the target speed of the compressor according to the vibration level difference and the resonance frequency specifically includes:

[0094] Compare the vibration level difference with a preset threshold, screen out the vibration level difference greater than the preset threshold, and determine the rotation speed corresponding to the vibration level difference greater than the preset threshold as a candidate rotation speed;

[0095] The speed corresponding to the resonance frequency is eliminated from the candidate speeds to obtain the target speed of the compressor.

[0096] For details, please refer to Fig. 9 , Fig. 9 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, when the refrigerator starts to run, according to the commonly used speed range of the compressor, the compressor is increased from the lowest speed to the highest speed according to the specified increase amount, and the first acceleration and the second acceleration of the compressor at different speeds are detected by the acceleration sensor arranged inside the compressor compartment. For example, the commonly used speed of the compressor is set to 10Hz-75Hz, and the speed of the compressor is increased in steps of 1Hz. Then, according to the first acceleration and the second acceleration of the compressor at different speeds detected by the acceleration sensor, the vibration level drop and the resonance frequency at each speed are calculated, and the vibration level drop evaluation and the resonance frequency evaluation are performed respectively, and the target speed of the compressor is determined according to the vibration level drop and the resonance frequency. When determining the target speed of the compressor according to the vibration level drop and the resonance frequency, the vibration level drop is compared with the preset threshold, and the vibration level drop greater than the preset threshold is screened out, and the speed corresponding to the vibration level drop greater than the preset threshold is determined as the candidate speed. It should be noted that the vibration level drop in the embodiment of the present invention is an expected value, for example, it can reduce vibration by 50%, that is, 20lg(2)=6, then the vibration level drop greater than 6 is excellent. After the candidate speeds are determined according to the vibration level drop, the speed corresponding to the resonance frequency is eliminated from the candidate speeds to obtain the target speed of the compressor.

[0097] The embodiment of the present invention further provides a vibration reduction control method for a refrigerator, which is applied to a refrigerator including a box, a refrigeration system and an acceleration sensor; wherein a plurality of compartments are arranged inside the box; the refrigeration system is arranged inside the box, and comprises a compressor, a condenser, an evaporator and a fan; the compressor is used to provide power for the refrigeration cycle of the refrigerator, and compress the low-temperature and low-pressure refrigerant into a high-temperature and high-pressure refrigerant gas; the condenser is used to condense and dissipate heat for the high-temperature and high-pressure refrigerant gas, and cool the high-temperature and high-pressure refrigerant gas into a normal-temperature and high-pressure refrigerant liquid; the evaporator is used to evaporate and absorb heat for the 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 send the heat-released air to the refrigerator compartment; the acceleration sensor is arranged inside the compressor compartment, and is used to detect the first acceleration and the second acceleration of the compressor. The vibration reduction control method for the refrigerator comprises:

[0098] S1, when the refrigerator starts to run, according to the first acceleration and the second acceleration of the compressor at different speeds detected by the acceleration sensor, calculate the vibration level difference and the resonance frequency at each speed;

[0099] S2: determining a target rotation speed of the compressor according to the vibration level difference and the resonance frequency.

[0100] When the refrigerator starts to run, according to the common speed range of the compressor, the compressor is increased from the lowest speed to the highest speed according to the specified increase amount, and the first acceleration and the second acceleration of the compressor at different speeds are detected by the acceleration sensor arranged inside the compressor compartment. For example, the common speed of the compressor is set to 10Hz-75Hz, and the speed of the compressor is increased in steps of 1Hz. Then, according to the first acceleration and the second acceleration of the compressor at different speeds detected by the acceleration sensor, the vibration level drop and the resonance frequency at each speed are calculated, and the vibration level drop evaluation and the resonance frequency evaluation are respectively performed, and the target speed of the compressor is determined according to the vibration level drop and the resonance frequency. If the first acceleration is similar to the second acceleration, the vibration level drop is small and the evaluation is poor; if the vibration level drop is large, the evaluation is good. The embodiment of the present invention can also warn the frequency of the poor vibration level drop evaluation to avoid using the corresponding speed, thereby avoiding the appearance of a bad compressor structure design in the design stage and user complaints after listing. It should be noted that there is no absolute evaluation value for the vibration level drop. The vibration level drop is different according to different products. The vibration level drop on the same product can be compared. Since the compressor rubber pad is the main measure for refrigerator products to control compressor vibration, the vibration level difference evaluation here is also an evaluation of the effect of the compressor rubber pad, and the assembly matching between the compressor and the product is evaluated by the vibration level difference. For example, according to the operating speed of the compressor, for example, 15, 25, and 35 Hz, if the vibration level difference of 15Hz is low, it means that the first acceleration is similar to the second acceleration, which means that the rubber pad does not play a good role, and then the matching is not good. If the output data shows that the vibration level difference of 13Hz or 16Hz is high, it means that the first acceleration and the second acceleration are very different. At this time, the rubber pad can play an effective role, and the speed of the compressor can be selected as 13Hz or 16Hz. The resonant frequency is calculated based on the first acceleration and the second acceleration, and the resonant frequency is the avoidance frequency of the compressor speed. For example, if 15Hz is the resonant frequency, the compressor cannot use this speed, and a similar speed can be used for avoidance. If the user mode uses a 30Hz speed, then select a speed with a high vibration level difference based on (25-35Hz). The control mode will make a comparative recommendation, which is a vibration level difference evaluation. Finally, you can choose a recommended speed, which is the target. At this speed, the vibration level difference is high and the rubber pad can achieve the best vibration reduction effect.

[0101] It should be noted that in order to avoid the influence of vibration of other components, if there are functional modules with large vibrations (such as ice makers, vacuum machines) or bottom cooling fans, they should be turned off before the refrigerator is started to avoid the influence of vibration of other components.

[0102] The embodiment of the present invention evaluates the assembly matching between the compressor and the product through the vibration level difference, and avoids the rotation speed of the resonance frequency through resonance identification, so that the compressor vibrates less when running at the target speed, effectively reducing the noise of the compressor during operation.

[0103] As one of the optional embodiments, when the refrigerator starts to operate, the acceleration sensor includes a first acceleration sensor and a second acceleration sensor;

[0104] The first acceleration sensor is disposed at the top of the compressor and is used to detect a first acceleration at the top of the compressor;

[0105] The second acceleration sensor is disposed at the bottom of the compressor and is used to detect a second acceleration of the bottom of the compressor.

[0106] Specifically, the acceleration sensor 30 in the embodiment of the present invention includes a first acceleration sensor and a second acceleration sensor. The first acceleration sensor is arranged at the top of the compressor, vertically above the ground, and is used to detect the first acceleration at the top of the compressor. The second acceleration sensor is arranged at the bottom of the compressor, vertically above the ground, for example, at the middle position next to the bottom plate of the compressor (either left or right), and the second acceleration sensor should be as close to the compressor as possible, and is used to detect the second acceleration at the bottom of the compressor.

[0107] As one of the optional embodiments, the calculation formula of the vibration level difference is:

[0108]

[0109] In the formula, L represents the vibration level difference, T top represents the first acceleration, T down Represents the second acceleration.

[0110] Specifically, the vibration level drop is defined as 20 times the common logarithm of the ratio of the effective value of the vibration response of the vibration isolation system to the effective value of the corresponding basic response. In the embodiment of the present invention, the vibration level drop at each speed is calculated based on the first acceleration (i.e., top acceleration) and the second acceleration (i.e., bottom acceleration) of the compressor at different speeds detected by the acceleration sensor.

[0111] As one of the optional embodiments, calculating the resonance frequency according to the first acceleration and the second acceleration of the compressor at different speeds detected by the acceleration sensor specifically includes:

[0112] calculating a first resonance peak according to the first acceleration of the compressor at different rotation speeds detected by the first acceleration sensor;

[0113] calculating a second resonance peak according to the second acceleration of the compressor at a corresponding speed detected by the second acceleration sensor;

[0114] If the frequency corresponding to the first resonance peak is equal to the frequency corresponding to the second resonance peak, the frequency is the resonance frequency.

[0115] Specifically, the embodiment of the present invention calculates the first resonance peak according to the first acceleration of the compressor at different speeds detected by the first acceleration sensor. The second resonance peak is calculated according to the second acceleration of the compressor at the corresponding speed detected by the second acceleration sensor. If the frequency corresponding to the first resonance peak is equal to the frequency corresponding to the second resonance peak, the frequency is the resonance frequency. Exemplarily, the embodiment of the present invention evaluates the measured acceleration peak value through the acceleration sensors located at the top and bottom of the compressor to determine the resonance peak.

[0116] T (f-3) >T f <T (f+3) ;

[0117] If the above formula is satisfied, it is determined to be the resonance peak measured at the position. In the formula, T is the acceleration of the current frequency, and f is the current frequency in Hz.

[0118] If the first acceleration sensor (ie, the top acceleration sensor) and the second acceleration sensor (ie, the bottom acceleration sensor) are both determined to be resonance peaks at the same frequency, then the frequency is determined to be the resonance frequency.

[0119] As one of the optional embodiments, determining the target speed of the compressor according to the vibration level difference and the resonance frequency specifically includes:

[0120] Compare the vibration level difference with a preset threshold, screen out the vibration level difference greater than the preset threshold, and determine the rotation speed corresponding to the vibration level difference greater than the preset threshold as a candidate rotation speed;

[0121] The speed corresponding to the resonance frequency is eliminated from the candidate speeds to obtain the target speed of the compressor.

[0122] Specifically, when determining the target speed of the compressor based on the vibration level drop and the resonance frequency, the embodiment of the present invention compares the vibration level drop with a preset threshold, screens out the vibration level drop greater than the preset threshold, and determines the speed corresponding to the vibration level drop greater than the preset threshold as the candidate speed. It should be noted that in the embodiment of the present invention, the vibration level drop is given an expected value, for example, it can reduce vibration by 50%, that is, 20lg(2)=6, then the vibration level drop greater than 6 is excellent. After the candidate speeds are determined based on the vibration level drop, the speed corresponding to the resonance frequency is eliminated from the candidate speeds to obtain the target speed of the compressor.

[0123] The embodiment of the present invention provides a refrigerator and a vibration reduction control method thereof, wherein the first acceleration and the second acceleration of the compressor are detected by an acceleration sensor disposed inside the compressor compartment. When the refrigerator starts to operate, the vibration level difference and the resonance frequency at each rotation speed are calculated according to the first acceleration and the second acceleration of the compressor at different rotation speeds detected by the acceleration sensor; the target rotation speed of the compressor is determined according to the vibration level difference and the resonance frequency. The embodiment of the present invention evaluates the assembly matching between the compressor and the product through the vibration level difference, and avoids the rotation speed of the resonance frequency through resonance identification, so that the compressor has less vibration when operating at the target rotation speed, and effectively reduces the noise of the compressor during operation.

[0124] 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.

[0125] 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 acceleration sensor disposed inside the compressor compartment and configured to detect a first acceleration and a second acceleration of the compressor; The controller is configured to, when the refrigerator starts running, calculate the vibration level difference and the resonance frequency at each speed based on the first acceleration and the second acceleration of the compressor at different speeds detected by the acceleration sensor; and determine the target speed of the compressor based on the vibration level difference and the resonance frequency.

2. The refrigerator according to claim 1, characterized in that: The acceleration sensor includes a first acceleration sensor and a second acceleration sensor; The first acceleration sensor is disposed at the top of the compressor and is used to detect a first acceleration at the top of the compressor; The second acceleration sensor is disposed at the bottom of the compressor and is used to detect a second acceleration of the bottom of the compressor.

3. The refrigerator according to claim 2, characterized in that: The calculation formula of the vibration level drop is: In the formula, L represents the vibration level difference, T top represents the first acceleration, T down Represents the second acceleration.

4. The refrigerator according to claim 3, characterized in that: The calculating the resonance frequency according to the first acceleration and the second acceleration of the compressor at different speeds detected by the acceleration sensor specifically includes: calculating a first resonance peak according to the first acceleration of the compressor at different rotation speeds detected by the first acceleration sensor; calculating a second resonance peak according to the second acceleration of the compressor at a corresponding speed detected by the second acceleration sensor; If the frequency corresponding to the first resonance peak is equal to the frequency corresponding to the second resonance peak, the frequency is the resonance frequency.

5. The refrigerator according to claim 4, characterized in that: The step of determining the target speed of the compressor according to the vibration level difference and the resonance frequency specifically includes: Compare the vibration level difference with a preset threshold, screen out the vibration level difference greater than the preset threshold, and determine the rotation speed corresponding to the vibration level difference greater than the preset threshold as a candidate rotation speed; The speed corresponding to the resonance frequency is eliminated from the candidate speeds to obtain the target speed of the compressor.

6. A vibration reduction control method for a refrigerator, characterized in that: The method is applied to a refrigerator including a box, a refrigeration system and an acceleration sensor; wherein the refrigeration system includes a compressor, a condenser, an evaporator and a fan; the acceleration sensor is arranged inside the compressor compartment and is used to detect a first acceleration and a second acceleration of the compressor. The vibration reduction control method of the refrigerator includes: When the refrigerator starts to run, according to the first acceleration and the second acceleration of the compressor at different speeds detected by the acceleration sensor, the vibration level difference and the resonance frequency at each speed are calculated; A target rotation speed of the compressor is determined according to the vibration level difference and the resonance frequency.

7. The refrigerator vibration reduction control method according to claim 6, characterized in that: The acceleration sensor includes a first acceleration sensor and a second acceleration sensor; The first acceleration sensor is disposed at the top of the compressor and is used to detect a first acceleration at the top of the compressor; The second acceleration sensor is disposed at the bottom of the compressor and is used to detect a second acceleration of the bottom of the compressor.

8. The refrigerator vibration reduction control method according to claim 7, characterized in that: The calculation formula of the vibration level drop is: In the formula, L represents the vibration level difference, T top represents the first acceleration, T down Represents the second acceleration.

9. The refrigerator vibration reduction control method according to claim 8, characterized in that: The calculating the resonance frequency according to the first acceleration and the second acceleration of the compressor at different speeds detected by the acceleration sensor specifically includes: calculating a first resonance peak according to the first acceleration of the compressor at different rotation speeds detected by the first acceleration sensor; calculating a second resonance peak according to the second acceleration of the compressor at a corresponding speed detected by the second acceleration sensor; If the frequency corresponding to the first resonance peak is equal to the frequency corresponding to the second resonance peak, the frequency is the resonance frequency.

10. The refrigerator vibration reduction control method according to claim 9, characterized in that: The step of determining the target speed of the compressor according to the vibration level difference and the resonance frequency specifically includes: Compare the vibration level difference with a preset threshold, screen out the vibration level difference greater than the preset threshold, and determine the rotation speed corresponding to the vibration level difference greater than the preset threshold as a candidate rotation speed; The speed corresponding to the resonance frequency is eliminated from the candidate speeds to obtain the target speed of the compressor.

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