CN116242081A - Refrigerator and test method for acquiring low-noise rotating speed of refrigerator - Google Patents

Abstract

The invention discloses a refrigerator and a test method for acquiring low-noise rotating speed of the refrigerator, wherein the rotating speed of a compartment fan is reduced firstly, then the rotating speed of a compressor is reduced to reduce the noise of the refrigerator, the amplitude of the rotating speed adjustment of the compressor is reduced, and then a large amount of noise generated in the rotating speed adjustment process of the compressor is reduced.

Description

Refrigerator and test method for acquiring low-noise rotating speed of refrigerator

Technical Field

The invention relates to the technical field of refrigerators, in particular to a refrigerator and a test method for acquiring low-noise rotating speed of the refrigerator.

Background

With the progress of technology and the development of economy, refrigerators are widely applied to life of people, and the refrigerators generate larger noise during operation, so that user experience is affected. The current product is to the noise control of refrigerator relies on research and development personnel's past experience to carry out the setting of refrigerator operating parameter, and noise reduction effect is relatively poor.

Disclosure of Invention

The embodiment of the invention aims to provide a refrigerator and a test method for acquiring low-noise rotating speed of the refrigerator, wherein the rotating speed of a compartment fan is firstly regulated, then the rotating speed of a compressor is reduced to reduce the noise of the refrigerator, and finally the rotating speed of the compartment fan is increased to enable the temperature of the compartment to meet the storage requirement, so that the refrigerating effect and the low-noise requirement of the refrigerator are considered, and the user experience is improved.

To achieve the above object, an embodiment of the present invention provides a refrigerator including:

a refrigerant circuit for sequentially circulating a refrigerant through a compressor, a condenser, a pressure reducer and an evaporator, for providing cold to a compartment of a refrigerator;

the compartment fan is used for sending the cooling capacity into the compartment;

the compartment sensor is arranged in the compartment and used for detecting the real-time temperature of the compartment;

a controller for:

responding to a low-noise operation instruction, and controlling the refrigerator to enter a first fan adjustment stage;

in a first fan adjustment stage, controlling the compartment fan to reduce the rotating speed by a first preset step-down length until the real-time compartment temperature detected by the compartment sensor is greater than a preset storage temperature, controlling the rotating speed of the compartment fan to increase by a first preset step-up length and controlling the refrigerator to enter a compressor adjustment stage;

In the stage of compressor adjustment, controlling the compressor to reduce the rotating speed by a second preset step, until the real-time temperature of the compartment is greater than the preset storage temperature, and controlling the refrigerator to enter a fan readjusting stage;

and in the stage of re-adjusting the fans, controlling the compartment fans to increase the rotating speed by a second preset up-adjusting step length until the real-time compartment temperature is less than or equal to the preset storage temperature.

As an improvement of the above scheme, the refrigerator further comprises a bottom cooling fan, which is arranged near the condenser and used for radiating heat for the condenser;

after the fan readjusting stage, controlling the refrigerator to enter a bottom cooling fan adjusting stage;

and in the stage of adjusting the bottom cooling fan, controlling the bottom cooling fan to reduce the rotating speed by a third preset step-down length until the obtained refrigerator energy consumption does not meet the low energy consumption condition, and controlling the rotating speed of the bottom cooling fan to increase the third preset step-up length.

As an improvement of the above, the refrigerator further includes:

the ambient temperature sensor is arranged outside the refrigerator and used for detecting the current ambient temperature;

the controller is further configured to:

before the compartment fan is controlled to reduce the rotating speed by a first preset step-down, the compartment fan, the compressor and the bottom cooling fan are respectively controlled to operate at the highest rotating speed;

In a fan readjusting stage, after controlling the compartment fan to increase the rotating speed by a second preset up-regulating step length until the real-time compartment temperature is less than or equal to the preset storage temperature, combining the current environment temperature detected by the ring temperature sensor, the current rotating speed of the compartment fan and the current rotating speed of the compressor to obtain a first operating parameter;

after the fan readjusting stage, controlling the refrigerator to enter the compressor readjusting stage again until the rotating speed of the compressor is reduced to a preset low rotating speed threshold value, and obtaining a plurality of first operating parameters corresponding to the current environment temperature; wherein, in the stage of compressor adjustment, the bottom cooling fan runs at the highest rotation speed per se;

controlling the refrigerator to enter a bottom cooling fan adjusting stage for adjusting the rotating speed of the bottom cooling fan according to each first operating parameter to obtain a target rotating speed of the bottom cooling fan corresponding to the first operating parameter;

and combining all the first operation parameters with corresponding target rotating speeds respectively to obtain a plurality of second operation parameters corresponding to the current environment temperature.

As an improvement of the above-described scheme, the low-energy consumption condition includes: the refrigerator energy consumption after the last rotation speed of the bottom cooling fan is reduced is smaller than the refrigerator energy consumption before the last rotation speed is reduced; alternatively, the low energy consumption condition includes: and the energy consumption of the refrigerator after the last rotation speed of the bottom cooling fan is adjusted down is smaller than a preset low energy consumption threshold.

As an improvement of the scheme, the refrigerator further comprises a noise sensor, which is arranged on the refrigerator and is used for detecting the noise of the whole refrigerator;

the controller is further configured to:

controlling the refrigerator to operate according to each second operation parameter to obtain the whole machine noise corresponding to each second operation parameter, which is detected by the noise sensor;

and screening out the second operation parameter with the minimum noise of the whole machine to serve as a target operation parameter corresponding to the current environment temperature.

As an improvement of the above solution, the controller is further configured to:

and controlling the change of the ambient temperature of the refrigerator, and regulating the rotating speeds of the compressor, the compartment fan and the bottom cooling fan according to each ambient temperature to obtain target operation parameters corresponding to each ambient temperature.

As an improvement of the above solution, the controller is further configured to:

responding to a low-noise operation instruction, and acquiring a target operation parameter corresponding to the real-time environment temperature detected by the ambient temperature sensor;

and controlling the refrigerator to operate according to the target operation parameters.

As an improvement of the above, the compartment includes a refrigerating compartment and a freezing compartment; the compartment fan comprises a refrigerating fan and a freezing fan; the refrigerating fan is used for sending the cold energy into the refrigerating chamber, and the freezing fan is used for sending the cold energy into the freezing chamber; the first preset step size comprises a first preset refrigeration step size and a second preset freezing step size, and the first preset step size comprises a first preset refrigeration step size and a second preset freezing step size; the second preset up-regulation step length comprises a second preset refrigeration up-regulation step length and a second preset freezing up-regulation step length.

As an improvement of the above scheme, the first preset step-down length is greater than or equal to the first preset step-up length, the first preset step-down length is greater than or equal to the second preset step-up length, and the third preset step-down length is greater than or equal to the third preset step-up length.

In order to achieve the above object, the embodiment of the present invention further provides a test method for obtaining a low noise rotation speed of a refrigerator, including:

responding to a low-noise operation instruction, and controlling the refrigerator to enter a first fan adjustment stage;

in a first fan adjustment stage, controlling a compartment fan of the refrigerator to reduce the rotating speed by a first preset step-down length until the real-time compartment temperature detected by a compartment sensor is greater than a preset storage temperature, and controlling the rotating speed of the compartment fan to increase by the first preset step-up length and controlling the refrigerator to enter a compressor adjustment stage; wherein the compartment sensor is arranged in the compartment;

in the compressor adjustment stage, controlling the compressor of the refrigerator to reduce the rotating speed by a second preset step-down length until the real-time temperature of the compartment is greater than the preset storage temperature, and controlling the refrigerator to enter a fan readjustment stage;

and in the stage of re-adjusting the fans, controlling the compartment fans to increase the rotating speed by a second preset up-adjusting step length until the real-time compartment temperature is less than or equal to the preset storage temperature.

Compared with the prior art, the refrigerator and the test method for acquiring the low-noise rotating speed of the refrigerator disclosed by the embodiment of the invention have the advantages that firstly, the compartment fan is controlled to reduce the rotating speed by a first preset step length by responding to a low-noise operation instruction so as to achieve the purpose of lower noise until the real-time temperature of the compartment is higher than the preset storage temperature; then, the rotating speed of the compartment fan is controlled to be increased by a first preset up-regulating step length, the real-time temperature of the compartment is guaranteed to meet the storage requirement, then, the rotating speed of the compressor is controlled to be reduced by a second preset down-regulating step length until the real-time temperature of the compartment is larger than the preset storage temperature, one-time regulation of the compressor is realized, and noise generated by the compressor is reduced; and finally, controlling the compartment fan to increase the rotating speed by a second preset up-regulating step length until the real-time temperature of the compartment is smaller than or equal to the preset storage temperature, and ensuring that the real-time temperature of the compartment meets the storage requirement. Therefore, according to the embodiment of the invention, the rotating speed of the compartment fan is reduced firstly, then the rotating speed of the compressor is reduced, so that the noise of the refrigerator is reduced, the amplitude of the rotating speed adjustment of the compressor is reduced, and a large amount of noise generated in the rotating speed adjustment process of the compressor is reduced.

Drawings

Fig. 1 is a perspective view of a refrigerator provided by an embodiment of the present invention;

fig. 2 is a perspective view of a refrigerator door according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a refrigeration system according to an embodiment of the present invention;

fig. 4 is a schematic flow diagram of a refrigerant during refrigeration according to an embodiment of the present invention;

FIG. 5 is a schematic view of air flow during refrigeration according to an embodiment of the present invention;

fig. 6 is a schematic view of an operating principle of a compressor according to an embodiment of the present invention;

FIG. 7 is a first workflow diagram of a controller provided by an embodiment of the present invention;

FIG. 8 is a schematic diagram of the correspondence between the rotational speeds and noise of three fans according to an embodiment of the present invention;

FIG. 9 is a second workflow diagram of a controller provided by an embodiment of the present invention;

FIG. 10 is a third workflow diagram of a controller provided by an embodiment of the present invention;

FIG. 11 is a fourth operational flow diagram of a controller provided by an embodiment of the present invention;

fig. 12 is a flowchart of a test method for obtaining a low noise rotation speed of a refrigerator according to an embodiment of the present invention.

100 parts of a box body, 200 parts of a door body, 210 parts of a door body outer shell, 220 parts of a door body inner container, 230 parts of an upper end cover, 240 parts of a lower end cover; 1. the device comprises a compressor, a condenser, a condensing prevention pipe, a drying filter, a pressure reducer, a evaporator, a gas-liquid separator and a gas-liquid separator, wherein the compressor, the condenser, the condensing prevention pipe and the condensing prevention pipe are respectively arranged at the bottom of the compressor, the condensing prevention pipe and the condensing prevention pipe respectively; 11. refrigerating chamber, 12, freezing chamber, 13, air duct, 14, chamber fan, 15, motor, 16, crank, 17, connecting rod, 18, slider, 19, cylinder, 20, piston, 21, suction valve, 22 discharge valve.

Detailed Description

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

Referring to fig. 1, fig. 1 is a perspective view of a refrigerator according to an embodiment of the present invention, the refrigerator according to the present embodiment has an approximately rectangular parallelepiped shape, the refrigerator including a cabinet 100 defining a storage space and a plurality of door bodies 200 provided at openings of the cabinet 100, wherein, referring to fig. 2, the door bodies 200 include a door body case 210 positioned at an outer side of the cabinet 100, a door body case 220 positioned at an inner side of the cabinet 100, an upper end cap 230, a lower end cap 240, and a heat insulation layer positioned between the door body case 210, the door body case 220, the upper end cap 230, and the lower end cap 240; typically, the insulating layer is filled with a foaming material. The case 100 is provided with a chamber including a component storage chamber for placing components in the refrigerator, such as a compressor, etc., and a storage space for storing foods, medicines, etc. The refrigerator in the embodiment of the invention comprises a refrigerating system, referring to a schematic structural diagram of the refrigerating system shown in fig. 3, wherein the refrigerating system is arranged in a component storage cavity and comprises a compressor, an evaporator, a pressure reducer and a condenser, the refrigerating system is actually a refrigerant loop, the refrigerant loop sequentially circulates refrigerant through the compressor, the condenser, the pressure reducer and the evaporator and is used for providing cold energy for a compartment of the refrigerator, and the compressor is used for providing power for refrigeration circulation of the refrigerator; the storage space may be partitioned into a plurality of compartments, which may be configured as a refrigerating compartment, a freezing compartment, and a temperature changing compartment (also referred to as a fresh food compartment) according to the purpose. Each compartment corresponds to one or more doors, for example in fig. 1, the upper compartment is provided with a double door. The door body can be pivoted at the opening of the box body and can also be opened in a drawer mode, so that drawer type storage is realized.

Further, each compartment is provided with at least one compartment sensor (not shown), illustratively, provided on an inner wall of the compartment, the probes of which are exposed to the storage space of the compartment for detecting the real-time temperature of the compartment.

Further, the refrigerator is also provided with an ambient temperature sensor (not shown in the drawing) provided outside the refrigerator for detecting the current ambient temperature.

Referring to fig. 3, fig. 3 is a schematic view showing a structure of a refrigerating system in a refrigerator according to an embodiment of the present invention, the refrigerating system including a compressor 1, a condenser 2, an anti-condensation pipe 3, a dry filter 4, a pressure reducer 5, an evaporator 6, and a gas-liquid separator 7. The working processes of the refrigeration system comprise a compression process, a condensation process, a throttling process and an evaporation process.

Wherein, in connection with fig. 3, the compression process is: when the power line of the refrigerator is inserted and the contact of the temperature controller is connected, the compressor 1 starts to work, the low-temperature and low-pressure refrigerant is sucked by the compressor 1, compressed into high-temperature and high-pressure overheat gas in the cylinder of the compressor 1 and then discharged to the condenser 2; the condensation process is as follows: the high-temperature and high-pressure refrigerant gas radiates heat through the condenser 2, the temperature is continuously reduced, the refrigerant gas is gradually cooled into normal-temperature and high-pressure saturated steam, the saturated steam is further cooled into saturated liquid, the temperature is not reduced any more, the temperature at the moment is called as condensing temperature, and the pressure of the refrigerant in the whole condensing process is almost unchanged; the throttling process is as follows: the condensed refrigerant saturated liquid is filtered by a dry filter 4 to remove moisture and impurities, and then flows into a pressure reducer 5 (such as a capillary tube), throttling and depressurization are carried out through the pressure reducer, and the refrigerant is changed into normal-temperature and low-pressure wet vapor; the evaporation process is as follows: the wet vapor with normal temperature and low pressure starts to absorb heat in the evaporator 6 to vaporize, so that the temperature of the evaporator and the surrounding temperature are reduced, the refrigerant is changed into low-temperature and low-pressure gas, the refrigerant coming out of the evaporator 6 returns to the compressor 1 again after passing through the gas-liquid separator 7, the process is repeated, the heat in the refrigerator is transferred into the air outside the refrigerator, the purpose of refrigeration is achieved, and the flow direction of the refrigerant can be shown in fig. 4.

Further, in order to improve the refrigerating effect of the refrigerator, a bottom cooling fan (not shown in the figure) is arranged near the condenser 2, acts on the condenser 2, and is used for radiating heat of the condenser 2, so that the heat exchange efficiency of the condenser is quickened to a certain extent, the full play of the compressor is facilitated, and the improvement of the refrigerating effect of the refrigerator is facilitated.

Referring to fig. 5, the refrigerator further includes a compartment blower 14, the compartment blower 14 makes air continuously enter fins of the evaporator 6 to perform heat exchange, and simultaneously sends the air cooled by the evaporator 6 after absorbing heat into the refrigerating chamber 11 and the freezing chamber 12 through an air duct 13, and the purpose of reducing temperature is achieved by using air ports corresponding to the compartments to realize continuous circulation flow of air in the compartments; the refrigerating air port arranged on the inner wall of the refrigerating chamber comprises a refrigerating air return port and a refrigerating air supply port, and is used for forming cold air circulation to provide cold energy for the refrigerating chamber, and the freezing chamber is also provided with a freezing air port (a freezing air supply port and a freezing air return port) in the same way. When the compartment fan rotates, air flow is generated, cold energy generated by the evaporator is blown to the air supply port along with the air flow, enters a compartment corresponding to the air supply port, provides cold energy for the compartment, and air in the compartment is extruded out and flows out from the corresponding air outlet and is brought back to the evaporator for heat exchange, so that primary air flow circulation is completed.

Referring to fig. 6, fig. 6 is a schematic diagram illustrating the working principle of a compressor according to an embodiment of the present invention, in which a motor 15 rotates, and a crank 16 drives a connecting rod 17 to control a slide block 18 to slide, so as to act on a piston 20 in a cylinder 19, and control an air suction valve 21 and an air discharge valve 22 of the cylinder 19 to perform air suction and air discharge. The compressor can vibrate during operation to generate noise, and particularly, the compressor can vibrate greatly and generate larger noise when accelerating or decelerating.

Specifically, in an embodiment of the present invention, the refrigerator further includes a controller for: responding to a low-noise operation instruction, and controlling the refrigerator to enter a first fan adjustment stage; in a first fan adjustment stage, controlling the compartment fan to reduce the rotating speed by a first preset step-down length until the real-time compartment temperature detected by the compartment sensor is greater than a preset storage temperature, controlling the rotating speed of the compartment fan to increase by a first preset step-up length and controlling the refrigerator to enter a compressor adjustment stage; in the stage of compressor adjustment, controlling the compressor to reduce the rotating speed by a second preset step, until the real-time temperature of the compartment is greater than the preset storage temperature, and controlling the refrigerator to enter a fan readjusting stage; and in the stage of re-adjusting the fans, controlling the compartment fans to increase the rotating speed by a second preset up-adjusting step length until the real-time compartment temperature is less than or equal to the preset storage temperature.

It should be noted that, the noise reduction method provided by the embodiment of the invention is suitable for the noise reduction requirements of any mode of the refrigerator, such as the operation modes of defrosting recovery period, first power-on, stable operation and the like, and according to the attribute of different modes, the noise reduction method provided by the embodiment of the invention is adopted in different operation modes, and then the low noise value rotating speed of each operation mode can be obtained. Therefore, the operation mode of the refrigerator is not limited herein.

The low noise operation instruction may be preset, for example, in a preset night time period, for example, from eight pm to eight am, the low noise operation instruction is automatically triggered, or a noise reduction button is set on the refrigerator, the low noise operation instruction is triggered by an input button signal, or the low noise operation instruction is triggered by a touch screen signal input on a display screen of the refrigerator, or a triggering condition of the low noise operation instruction may be limited in other manners, which is not limited herein.

Referring to fig. 7, fig. 7 is a first workflow diagram of a controller according to an embodiment of the present invention, the controller being configured to perform steps S11 to S18:

and S11, responding to a low-noise operation instruction, controlling the compartment fan to reduce the rotating speed by a first preset step-down length, and then entering step S12.

Specifically, referring to fig. 8, fig. 8 is a schematic diagram of a correspondence relationship between rotational speeds and noise of three fans provided in an embodiment of the present invention, where a first row represents rotational speeds of the fans, a second row represents noise of the first fan at each rotational speed, a third row represents noise of the second fan at each rotational speed, and a fourth row represents noise of the third fan at each rotational speed, so that as the rotational speeds of the fans increase, the noise value gradually increases, and therefore, in response to a low-noise operation instruction, the room fan is controlled to reduce the rotational speeds by a first preset step-down adjustment step, so as to reduce the noise.

It should be noted that, the specific value of the first preset step-down step is set by the manufacturer according to the actual situation, which is not limited herein.

S12, judging whether the real-time temperature of the compartment detected by the compartment sensor is greater than a preset storage temperature, if so, entering a step S13, and if not, returning to the step S11.

Specifically, when the rotation speed of the compartment fan is reduced once, the real-time temperature of the compartment needs to be judged, and when the real-time temperature of the compartment is smaller than or equal to the preset storage temperature, the temperature in the compartment of the refrigerator meets the storage requirement, so that the step S11 is returned, the rotation speed of the compartment fan is reduced again, and noise generated by the compartment fan is further reduced.

It should be noted that, the specific value of the preset storage temperature is set by the manufacturer according to the actual situation, which is not limited herein.

S13, controlling the rotating speed of the compartment fan to be increased by a first preset up-regulating step, and then entering step S14.

Specifically, after the rotation speed of the compartment fan is reduced for the first time, the real-time temperature of the compartment needs to be judged, and when the real-time temperature of the compartment is greater than the preset storage temperature, the temperature in the compartment of the refrigerator does not meet the storage requirement, so that the rotation speed of the compartment fan needs to be increased, the real-time temperature of the compartment is reduced, and the storage requirement of the refrigerator is met.

It should be noted that, the specific value of the first preset up-adjustment step is set by the manufacturer according to the actual situation, which is not limited herein.

S14, controlling the compressor to reduce the rotating speed by a second preset step-down step, and then entering step S15.

Specifically, the structure of the compressor can know that the compressor can generate larger vibration and larger noise when in speed change, the risk of cylinder collision exists, and the fault probability of the refrigerator is increased, so that the rotating speed of the fan is firstly subjected to descending adjustment, the rotating speed adjusting space of the compressor is correspondingly reduced after the fan is adjusted, the rotating speed adjustment of the compressor can be reduced, and the rotating speed of the compressor is reduced by a second preset descending adjustment step for reducing the noise generated by the operation of the compressor.

It should be noted that, the specific value of the second preset step-down step is set by the manufacturer according to the actual situation, which is not limited herein.

And S15, judging whether the real-time temperature of the compartment is greater than a preset storage temperature, if so, entering a step S16, and if not, returning to the step S14.

Specifically, when the real-time temperature of the compartment is less than or equal to the preset storage temperature, the temperature in the compartment of the refrigerator meets the storage requirement, so that the process returns to step S14, the rotating speed of the compressor is reduced again, and noise generated by the compressor is further reduced.

S16, controlling the compartment fan to increase the rotating speed by a second preset up-regulating step, and then entering step S17.

And S17, judging whether the real-time temperature of the compartment is less than or equal to the preset storage temperature, if so, entering a step S18, and if not, returning to the step S16. Optionally, the first preset down-adjustment step length, the first preset up-adjustment step length and the second preset up-adjustment step length are equal.

Specifically, after the rotation speed of the primary compressor is reduced, the real-time temperature of the compartment needs to be judged, when the real-time temperature of the compartment is larger than the preset storage temperature, the temperature in the compartment of the refrigerator does not meet the storage requirement, and the speed change of the compressor is considered to generate larger noise, so that the real-time temperature of the compartment is reduced by gradually increasing the rotation speed of the compartment fan, and the storage requirement of the refrigerator is met.

It should be noted that, the specific value of the second preset up-adjustment step is set by the manufacturer according to the actual situation, which is not limited herein.

S18, controlling the refrigerator to keep the current running state.

It is worth to describe that after each rotation speed adjustment of the compartment blower and the compressor, a preset period of time needs to be waited, so that the compartment temperature can accurately reflect the influence of the current running state of the related device on the refrigerating effect of the compartment, and the waiting period can be set by a worker according to the actual situation, and is not limited herein.

Compared with the prior art, the embodiment of the invention can reduce the noise of the refrigerator by reducing the rotating speed of the compartment fan and then reducing the rotating speed of the compressor, reduce the adjusting amplitude of the rotating speed of the compressor, further reduce a large amount of noise generated in the adjusting process of the rotating speed of the compressor, and improve the rotating speed of the compartment fan after the rotating speed of the compressor is adjusted, so that the temperature of the compartment can meet the storage requirement, the refrigerating effect and the low noise requirement of the refrigerator are considered, and the user experience is improved.

In one embodiment, the controller is further configured to: the refrigerator further comprises a bottom cooling fan, a cooling fan and a cooling fan, wherein the bottom cooling fan is arranged near the condenser and used for cooling the condenser; after the fan readjusting stage, controlling the refrigerator to enter a bottom cooling fan adjusting stage; and in the stage of adjusting the bottom cooling fan, controlling the bottom cooling fan to reduce the rotating speed by a third preset step-down length until the obtained refrigerator energy consumption does not meet the low energy consumption condition, and controlling the rotating speed of the bottom cooling fan to increase the third preset step-up length.

Referring to fig. 9, fig. 9 is a second workflow diagram of a controller according to an embodiment of the present invention, the controller further configured to perform steps S19 to S22 after step S18:

s19, controlling the bottom cooling fan to reduce the rotating speed by a third preset step-down length, and then entering step 20.

Specifically, since the operation of the bottom cooling fan also generates larger noise, noise reduction treatment is needed, and the purpose of reducing the noise is achieved by controlling the bottom cooling fan to reduce the rotating speed by a third preset step-down length.

It should be noted that, the specific value of the third preset step-down step is set by the manufacturer according to the actual situation, which is not limited herein.

S20, judging whether the obtained refrigerator energy consumption meets the low energy consumption condition, if so, returning to the step S19, and if not, entering the step S21.

Specifically, the bottom cooling fan acts on the condenser to enhance the heat dissipation effect of the refrigerator, when the rotating speed of the bottom cooling fan is too low, the heat dissipation of the refrigerator is not facilitated, the working efficiency of the compressor is adversely affected, and the energy consumption of the refrigerator is increased, so that the energy consumption is required to be concerned when the rotating speed of the bottom cooling fan is adjusted, and the low-energy-consumption operation and the low-noise control of the refrigerator are considered.

It should be noted that the low energy consumption condition is set by the manufacturer according to the actual situation, and is not limited herein.

S21, controlling the rotating speed of the bottom cooling fan to increase by a third preset up-regulating step, and then entering into step S22.

Specifically, after the rotation speed of the primary bottom cooling fan is reduced, the energy consumption of the refrigerator needs to be judged, and when the current energy consumption of the refrigerator does not meet the low energy consumption condition, the rotation speed of the bottom cooling fan needs to be increased so as to meet the low energy consumption requirement of the refrigerator.

It should be noted that, the specific value of the third preset up-adjustment step is set by the manufacturer according to the actual situation, which is not limited herein. Optionally, the third preset up-adjustment step size is equal to the third preset down-adjustment step size.

S22, controlling the refrigerator to keep the current running state.

It should be noted that, after each rotation speed adjustment of the bottom cooling fan, a preset period of time needs to be waited, so that the obtained refrigerator can accurately reflect the influence of the current running state of the related device on the energy consumption, and the waiting period can be set by a worker according to the actual situation, which is not limited herein.

Therefore, the rotation speed of the bottom cooling fan is adjusted downwards to achieve the purpose of noise reduction, meanwhile, the energy consumption of the refrigerator is focused, the energy consumption of the refrigerator is used as the constraint of the rotation speed adjustment of the bottom cooling fan, and the low-energy-consumption operation and the low-noise control of the refrigerator are considered.

In one embodiment, the controller is further configured to: before the compartment fan is controlled to reduce the rotating speed by a first preset step-down, the compartment fan, the compressor and the bottom cooling fan are respectively controlled to operate at the highest rotating speed; in a fan readjusting stage, after controlling the compartment fan to increase the rotating speed by a second preset up-regulating step length until the real-time compartment temperature is less than or equal to the preset storage temperature, combining the current environment temperature detected by the ring temperature sensor, the current rotating speed of the compartment fan and the current rotating speed of the compressor to obtain a first operating parameter; after the fan readjusting stage, controlling the refrigerator to enter the compressor readjusting stage again until the rotating speed of the compressor is reduced to a preset low rotating speed threshold value, and obtaining a plurality of first operating parameters corresponding to the current environment temperature; wherein, in the stage of compressor adjustment, the bottom cooling fan runs at the highest rotation speed per se; controlling the refrigerator to enter a bottom cooling fan adjusting stage for adjusting the rotating speed of the bottom cooling fan according to each first operating parameter to obtain a target rotating speed of the bottom cooling fan corresponding to the first operating parameter; and combining all the first operation parameters with corresponding target rotating speeds respectively to obtain a plurality of second operation parameters corresponding to the current environment temperature.

In particular, in order to enable multiple debugging operations during subsequent applications, low noise parameters may be tested and recorded at the beginning of product design for subsequent applications.

Referring to fig. 10, fig. 10 is a third workflow diagram of a controller according to an embodiment of the present invention, the controller being configured to perform steps S23 to S37:

s23, responding to the low-noise operation instruction, acquiring the current environment temperature detected by the ambient temperature sensor, and then entering step S24.

S24, respectively controlling the compartment fan, the compressor and the bottom cooling fan to run at the highest rotation speed, and then entering step S25.

Specifically, the whole refrigerator is controlled to operate at a preset maximum rotation speed for a preset stable period, so that the refrigerator can stably operate at the maximum rotation speed. The specific values of the preset stable duration, the maximum rotation speed of the compartment fan, the maximum rotation speed of the compressor and the maximum rotation speed of the bottom cooling fan are set by manufacturers according to actual conditions, and are not limited herein.

S25, controlling the compartment fan to reduce the rotating speed by a first preset step-down step, and then entering step S26.

S26, judging whether the real-time temperature of the compartment detected by the compartment sensor is greater than a preset storage temperature, if so, entering a step S27, and if not, returning to the step S15.

And S27, controlling the rotating speed of the compartment fan to be increased by a first preset up-regulating step, and then entering step S28.

And S28, controlling the compressor to reduce the rotating speed by a second preset step-down, and then entering step S29.

And S29, judging whether the real-time temperature of the compartment is higher than a preset storage temperature, if so, entering a step S30, and if not, returning to the step S28.

S30, controlling the compartment fan to increase the rotating speed by a second preset up-regulating step, and then entering step S31.

S31, judging whether the real-time temperature of the compartment is less than or equal to the preset storage temperature, if so, entering a step S32, and if not, returning to the step S30.

S32, combining the current ambient temperature, the current rotating speed of the compartment fan and the current rotating speed of the compressor to obtain a first operating parameter, controlling the compartment fan and the compressor of the refrigerator to keep running in the current operating state, and then entering step S33.

S33, controlling the bottom cooling fan to reduce the rotating speed by a third preset step-down length, and then entering step S34.

S34, judging whether the obtained refrigerator energy consumption meets the low energy consumption condition, if so, returning to the step S33, and if not, entering into the step S35.

And S35, controlling the rotating speed of the bottom cooling fan to increase by a third preset up-regulating step, and then entering into step S36.

S36, combining the current ambient temperature, the current first operation parameters and the current rotating speed of the bottom cooling fan to obtain a group of second operation parameters, recording the second operation parameters, controlling the bottom cooling fan to operate at the highest rotating speed, and then entering step S37. It can be understood that the bottom cooling fan needs to be adjusted after the compressor and the compartment fan are adjusted, so that the noise reduction and the refrigerator energy consumption can be considered to the greatest extent.

S37, judging whether the current rotation speed of the compressor is smaller than or equal to a preset low rotation speed threshold value, if yes, ending, and if not, returning to the step S28.

It should be noted that the preset low rotation speed threshold is set by the manufacturer according to actual situations, and is not limited herein. When the second operation parameters are tested, all the first operation parameters can be obtained through testing, then the rotation speed adjustment test of the bottom cooling fan can be conducted for each group of the first operation parameters, a group of the first operation parameters can be obtained through each test, the rotation speed adjustment test of the bottom cooling fan can be conducted to obtain a group of the second operation parameters, then the adjustment stage of the compressor is obtained to obtain a new group of the first operation parameters again, and the like until all the second operation parameters are obtained.

It should be noted that, the second operation parameters obtained by the test in the embodiment are multiple groups of operation parameters corresponding to the current environmental temperature, and if the real-time environmental temperature is the same as the current environmental temperature, in the subsequent noise reduction application, a group of parameters can be selected from the second operation parameters obtained by the test to operate.

In one embodiment, the low energy consumption condition comprises: the refrigerator energy consumption after the last rotation speed of the bottom cooling fan is reduced is smaller than the refrigerator energy consumption before the last rotation speed is reduced; alternatively, the low energy consumption condition includes: and the energy consumption of the refrigerator after the last rotation speed of the bottom cooling fan is adjusted down is smaller than a preset low energy consumption threshold.

Specifically, the low energy consumption condition may be one of the following, in which the first is that the trend of change of the energy consumption of the refrigerator before and after the last rotation speed adjustment of the bottom cooling fan is an ascending trend, and the second is that the energy consumption of the refrigerator after the last rotation speed adjustment of the bottom cooling fan is smaller than a preset low energy consumption threshold. The first condition has the advantages that the energy consumption is reduced as much as possible, and the noise generated by the bottom cooling fan is taken into consideration mainly; the second condition has the advantage of limiting the energy consumption not to be too high, reducing noise as much as possible. Thus, the two modes have different emphasis points, and the technical effects are different. Further, it may be determined that the low-power consumption condition is satisfied when one of the two specific conditions is satisfied.

It should be noted that the preset low energy consumption threshold is set by the manufacturer according to the actual situation, which is not limited herein.

In one embodiment, the refrigerator further comprises a noise sensor (not shown in the figure) arranged on the refrigerator and used for detecting the noise of the whole machine of the refrigerator; the controller is further configured to: controlling the refrigerator to operate according to each second operation parameter to obtain the whole machine noise corresponding to each second operation parameter, which is detected by the noise sensor; and screening out the second operation parameter with the minimum noise of the whole machine to serve as a target operation parameter corresponding to the current environment temperature.

Referring to fig. 11, fig. 11 is a fourth operation flowchart of the controller according to the embodiment of the present invention, the controller is configured to perform steps S38 to S39:

s38, controlling the refrigerator to operate according to each second operation parameter, and obtaining the whole machine noise corresponding to each second operation parameter, which is detected by the noise sensor.

And S39, screening out the second operation parameter with the minimum noise of the whole machine to serve as a target operation parameter corresponding to the current environment temperature.

Specifically, the refrigerator is controlled to operate according to each set of second operation parameters obtained through testing, corresponding whole machine noise is detected, and the target operation parameter with the smallest whole machine noise as the current environment temperature is screened out for direct application in subsequent practical application.

Further, the refrigerator further comprises a display screen (not shown in the figure), wherein the display screen is arranged on the door body and used for displaying the target operation parameters obtained through debugging.

In one embodiment, the controller is further configured to:

and controlling the change of the ambient temperature of the refrigerator, and regulating the rotating speeds of the compressor, the compartment fan and the bottom cooling fan according to each ambient temperature to obtain target operation parameters corresponding to each ambient temperature.

Specifically, in order to facilitate subsequent application, the target operation parameters corresponding to each environmental temperature are tested first to obtain the target operation parameters corresponding to each environmental temperature.

In one embodiment, the controller is further configured to:

responding to a low-noise operation instruction, and acquiring a target operation parameter corresponding to the real-time environment temperature detected by the ambient temperature sensor;

and controlling the refrigerator to operate according to the target operation parameters.

Specifically, in practical application, in response to a low noise operation instruction, the real-time environment temperature is first acquired, whether there is a target operation parameter corresponding to the real-time environment temperature is searched from the pre-stored data, and if there is, the target operation parameter corresponding to the real-time environment temperature is acquired for control of the refrigerator.

Further, in order to cope with the aging caused by the refrigerator, parameter debugging can be performed again after the preset refreshing time, and the target operation parameters can be updated.

In one embodiment, the compartments include a refrigerator compartment and a freezer compartment; the compartment fan comprises a refrigerating fan and a freezing fan; the refrigerating fan is used for sending the cold energy into the refrigerating chamber, and the freezing fan is used for sending the cold energy into the freezing chamber; the first preset step size comprises a first preset refrigeration step size and a second preset freezing step size, and the first preset step size comprises a first preset refrigeration step size and a second preset freezing step size; the second preset up-regulation step length comprises a second preset refrigeration up-regulation step length and a second preset freezing up-regulation step length.

It should be noted that, the compartments include a refrigerating chamber and a freezing chamber, each compartment is configured with a corresponding compartment fan, and when the adjustment is performed, the step size value of the up-adjustment or the down-adjustment may be inconsistent, and in general, the step size of the rotation speed adjustment of the compartment fan of the refrigerating chamber is larger than that of the freezing chamber.

In one embodiment, the first preset step down length is equal to or greater than the first preset step up length, the first preset step down length is equal to or greater than the second preset step up length, and the third preset step down length is equal to or greater than the third preset step up length. It should be noted that the above-mentioned size relation between the steps is set to achieve a better effect of noise adjustment.

Compared with the prior art, the refrigerator disclosed by the embodiment of the invention firstly controls the compartment fan to reduce the rotating speed by a first preset step-down length by responding to a low-noise operation instruction so as to achieve the purpose of lower noise until the real-time temperature of the compartment is higher than the preset storage temperature; then, the rotating speed of the compartment fan is controlled to be increased by a first preset up-regulating step length, the real-time temperature of the compartment is guaranteed to meet the storage requirement, then, the rotating speed of the compressor is controlled to be reduced by a second preset down-regulating step length until the real-time temperature of the compartment is larger than the preset storage temperature, one-time regulation of the compressor is realized, and noise generated by the compressor is reduced; and finally, controlling the compartment fan to increase the rotating speed by a second preset up-regulating step length until the real-time temperature of the compartment is smaller than or equal to the preset storage temperature, and ensuring that the real-time temperature of the compartment meets the storage requirement. Therefore, according to the embodiment of the invention, the rotating speed of the compartment fan is reduced firstly, then the rotating speed of the compressor is reduced, so that the noise of the refrigerator is reduced, the amplitude of the rotating speed adjustment of the compressor is reduced, and a large amount of noise generated in the rotating speed adjustment process of the compressor is reduced.

Referring to fig. 12, fig. 12 is a flowchart of a test method for obtaining a low noise rotation speed of a refrigerator according to an embodiment of the present invention, where the test method for obtaining a low noise rotation speed of a refrigerator according to an embodiment of the present invention is implemented by a controller in the refrigerator; the method comprises the following steps:

s1, responding to a low-noise operation instruction, and controlling the refrigerator to enter a first fan adjustment stage;

s2, in a first fan adjustment stage, controlling a compartment fan of the refrigerator to reduce the rotating speed by a first preset step-down length until the real-time compartment temperature detected by a compartment sensor is greater than a preset storage temperature, and controlling the rotating speed of the compartment fan to increase the first preset step-up length and controlling the refrigerator to enter a compressor adjustment stage; wherein the compartment sensor is arranged in the compartment;

s3, in a compressor adjustment stage, controlling a compressor of the refrigerator to reduce the rotating speed by a second preset step, until the real-time temperature of the compartment is greater than the preset storage temperature, and controlling the refrigerator to enter a fan readjustment stage;

s4, controlling the compartment fan to increase the rotating speed by a second preset up-regulating step length in the fan readjusting stage until the real-time compartment temperature is less than or equal to the preset storage temperature.

In one embodiment, the method further comprises:

after the fan readjusting stage, controlling the refrigerator to enter a bottom cooling fan adjusting stage;

in the stage of adjusting the bottom cooling fan, controlling the bottom cooling fan to reduce the rotating speed by a third preset step-down length until the obtained refrigerator energy consumption does not meet the low energy consumption condition, and controlling the rotating speed of the bottom cooling fan to increase the third preset step-up length; the bottom cooling fan is arranged near the condenser and used for radiating heat for the condenser.

In one embodiment, the method further comprises:

before the compartment fan is controlled to reduce the rotating speed by a first preset step-down, the compartment fan, the compressor and the bottom cooling fan are respectively controlled to operate at the highest rotating speed;

in a fan readjusting stage, after controlling the compartment fan to increase the rotating speed by a second preset up-regulating step length until the real-time compartment temperature is less than or equal to the preset storage temperature, combining the current environment temperature detected by a ring temperature sensor, the current rotating speed of the compartment fan and the current rotating speed of the compressor to obtain a first operating parameter;

after the fan readjusting stage, controlling the refrigerator to enter the compressor readjusting stage again until the rotating speed of the compressor is reduced to a preset low rotating speed threshold value, and obtaining a plurality of first operating parameters corresponding to the current environment temperature; wherein, in the stage of compressor adjustment, the bottom cooling fan runs at the highest rotation speed per se;

Controlling the refrigerator to enter a bottom cooling fan adjusting stage for adjusting the rotating speed of the bottom cooling fan according to each first operating parameter to obtain a target rotating speed of the bottom cooling fan corresponding to the first operating parameter;

and combining all the first operation parameters with corresponding target rotating speeds respectively to obtain a plurality of second operation parameters corresponding to the current environment temperature.

In one embodiment, the low energy consumption condition is: the refrigerator energy consumption after the last rotation speed of the bottom cooling fan is reduced is smaller than the refrigerator energy consumption before the last rotation speed is reduced; alternatively, the low energy consumption condition is: and the energy consumption of the refrigerator after the last rotation speed of the bottom cooling fan is adjusted down is smaller than a preset low energy consumption threshold.

In one embodiment, the method further comprises:

controlling the refrigerator to operate according to each second operation parameter to obtain the whole machine noise corresponding to each second operation parameter, which is detected by a noise sensor; the noise sensor is arranged on the refrigerator and is used for detecting the noise of the whole refrigerator;

and screening out the second operation parameter with the minimum noise of the whole machine to serve as a target operation parameter corresponding to the current environment temperature.

In one embodiment, the method further comprises:

and controlling the change of the ambient temperature of the refrigerator, and regulating the rotating speeds of the compressor, the compartment fan and the bottom cooling fan according to each ambient temperature to obtain target operation parameters corresponding to each ambient temperature.

In one embodiment, the method further comprises:

responding to a low-noise operation instruction, and acquiring a target operation parameter corresponding to the real-time environment temperature detected by the ambient temperature sensor;

and controlling the refrigerator to operate according to the target operation parameters.

In one embodiment, the compartments include a refrigerator compartment and a freezer compartment; the compartment fan comprises a refrigerating fan and a freezing fan; the refrigerating fan is used for sending the cold energy into the refrigerating chamber, and the freezing fan is used for sending the cold energy into the freezing chamber; the first preset step size comprises a first preset refrigeration step size and a second preset freezing step size, and the first preset step size comprises a first preset refrigeration step size and a second preset freezing step size; the second preset up-regulation step length comprises a second preset refrigeration up-regulation step length and a second preset freezing up-regulation step length.

In one embodiment, the first preset step down length is equal to or greater than the first preset step up length, the first preset step down length is equal to or greater than the second preset step up length, and the third preset step down length is equal to or greater than the third preset step up length.

It should be noted that, the working process of any test method for obtaining the low-noise rotation speed of the refrigerator in the embodiment of the present invention may refer to the specific working process of the controller of the refrigerator in the above embodiment, and will not be described herein.

Compared with the prior art, the test method for acquiring the low-noise rotating speed of the refrigerator disclosed by the embodiment of the invention comprises the steps of firstly controlling a compartment fan to reduce the rotating speed by a first preset step down by responding to a low-noise operation instruction so as to achieve the purpose of lower noise until the real-time temperature of the compartment is greater than the preset storage temperature; then, the rotating speed of the compartment fan is controlled to be increased by a first preset up-regulating step length, the real-time temperature of the compartment is guaranteed to meet the storage requirement, then, the rotating speed of the compressor is controlled to be reduced by a second preset down-regulating step length until the real-time temperature of the compartment is larger than the preset storage temperature, one-time regulation of the compressor is realized, and noise generated by the compressor is reduced; and finally, controlling the compartment fan to increase the rotating speed by a second preset up-regulating step length until the real-time temperature of the compartment is smaller than or equal to the preset storage temperature, and ensuring that the real-time temperature of the compartment meets the storage requirement. Therefore, according to the embodiment of the invention, the rotating speed of the compartment fan is reduced firstly, then the rotating speed of the compressor is reduced, so that the noise of the refrigerator is reduced, the amplitude of the rotating speed adjustment of the compressor is reduced, and a large amount of noise generated in the rotating speed adjustment process of the compressor is reduced.

While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.

Claims (10)

1. A refrigerator, comprising:

a refrigerant circuit for sequentially circulating a refrigerant through a compressor, a condenser, a pressure reducer and an evaporator, for providing cold to a compartment of a refrigerator;

the compartment fan is used for sending the cooling capacity into the compartment;

the compartment sensor is arranged in the compartment and used for detecting the real-time temperature of the compartment;

a controller for:

responding to a low-noise operation instruction, and controlling the refrigerator to enter a first fan adjustment stage;

in a first fan adjustment stage, controlling the compartment fan to reduce the rotating speed by a first preset step-down length until the real-time compartment temperature detected by the compartment sensor is greater than a preset storage temperature, controlling the rotating speed of the compartment fan to increase by a first preset step-up length and controlling the refrigerator to enter a compressor adjustment stage;

in the stage of compressor adjustment, controlling the compressor to reduce the rotating speed by a second preset step, until the real-time temperature of the compartment is greater than the preset storage temperature, and controlling the refrigerator to enter a fan readjusting stage;

And in the stage of re-adjusting the fans, controlling the compartment fans to increase the rotating speed by a second preset up-adjusting step length until the real-time compartment temperature is less than or equal to the preset storage temperature.

2. The refrigerator of claim 1, further comprising a bottom cooling fan disposed adjacent to the condenser for dissipating heat from the condenser;

after the fan readjusting stage, controlling the refrigerator to enter a bottom cooling fan adjusting stage;

and in the stage of adjusting the bottom cooling fan, controlling the bottom cooling fan to reduce the rotating speed by a third preset step-down length until the obtained refrigerator energy consumption does not meet the low energy consumption condition, and controlling the rotating speed of the bottom cooling fan to increase the third preset step-up length.

3. The refrigerator of claim 2, further comprising:

the ambient temperature sensor is arranged outside the refrigerator and used for detecting the current ambient temperature;

the controller is further configured to:

before the compartment fan is controlled to reduce the rotating speed by a first preset step-down, the compartment fan, the compressor and the bottom cooling fan are respectively controlled to operate at the highest rotating speed;

in a fan readjusting stage, after controlling the compartment fan to increase the rotating speed by a second preset up-regulating step length until the real-time compartment temperature is less than or equal to the preset storage temperature, combining the current environment temperature detected by the ring temperature sensor, the current rotating speed of the compartment fan and the current rotating speed of the compressor to obtain a first operating parameter;

After the fan readjusting stage, controlling the refrigerator to enter the compressor readjusting stage again until the rotating speed of the compressor is reduced to a preset low rotating speed threshold value, and obtaining a plurality of first operating parameters corresponding to the current environment temperature; wherein, in the stage of compressor adjustment, the bottom cooling fan runs at the highest rotation speed per se;

controlling the refrigerator to enter a bottom cooling fan adjusting stage for adjusting the rotating speed of the bottom cooling fan according to each first operating parameter to obtain a target rotating speed of the bottom cooling fan corresponding to the first operating parameter;

and combining all the first operation parameters with corresponding target rotating speeds respectively to obtain a plurality of second operation parameters corresponding to the current environment temperature.

4. The refrigerator of claim 2 or 3, wherein the low power consumption condition comprises: the refrigerator energy consumption after the last rotation speed of the bottom cooling fan is reduced is smaller than the refrigerator energy consumption before the last rotation speed is reduced; alternatively, the low energy consumption condition includes: and the energy consumption of the refrigerator after the last rotation speed of the bottom cooling fan is adjusted down is smaller than a preset low energy consumption threshold.

5. The refrigerator as claimed in claim 3, further comprising a noise sensor provided on the refrigerator for detecting a whole noise of the refrigerator;

The controller is further configured to:

controlling the refrigerator to operate according to each second operation parameter to obtain the whole machine noise corresponding to each second operation parameter, which is detected by the noise sensor;

and screening out the second operation parameter with the minimum noise of the whole machine to serve as a target operation parameter corresponding to the current environment temperature.

6. The refrigerator of claim 5, wherein the controller is further configured to:

and controlling the change of the ambient temperature of the refrigerator, and regulating the rotating speeds of the compressor, the compartment fan and the bottom cooling fan according to each ambient temperature to obtain target operation parameters corresponding to each ambient temperature.

7. The refrigerator of claim 5 or 6, wherein the controller is further configured to:

responding to a low-noise operation instruction, and acquiring a target operation parameter corresponding to the real-time environment temperature detected by the ambient temperature sensor;

and controlling the refrigerator to operate according to the target operation parameters.

8. The refrigerator as claimed in any one of claims 1 to 3, wherein the compartment includes a refrigerating compartment and a freezing compartment; the compartment fan comprises a refrigerating fan and a freezing fan; the refrigerating fan is used for sending the cold energy into the refrigerating chamber, and the freezing fan is used for sending the cold energy into the freezing chamber; the first preset step size comprises a first preset refrigeration step size and a second preset freezing step size, and the first preset step size comprises a first preset refrigeration step size and a second preset freezing step size; the second preset up-regulation step length comprises a second preset refrigeration up-regulation step length and a second preset freezing up-regulation step length.

9. The refrigerator of claim 2 or 3 wherein the first preset step down length is equal to or greater than the first preset step up length, the first preset step down length is equal to or greater than a second preset step up length, and the third preset step down length is equal to or greater than the third preset step up length.

10. A test method for obtaining a low noise rotational speed of a refrigerator, comprising:

responding to a low-noise operation instruction, and controlling the refrigerator to enter a first fan adjustment stage;

in a first fan adjustment stage, controlling a compartment fan of the refrigerator to reduce the rotating speed by a first preset step-down length until the real-time compartment temperature detected by a compartment sensor is greater than a preset storage temperature, and controlling the rotating speed of the compartment fan to increase by the first preset step-up length and controlling the refrigerator to enter a compressor adjustment stage; wherein the compartment sensor is arranged in the compartment;

in the compressor adjustment stage, controlling the compressor of the refrigerator to reduce the rotating speed by a second preset step-down length until the real-time temperature of the compartment is greater than the preset storage temperature, and controlling the refrigerator to enter a fan readjustment stage;

and in the stage of re-adjusting the fans, controlling the compartment fans to increase the rotating speed by a second preset up-adjusting step length until the real-time compartment temperature is less than or equal to the preset storage temperature.

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