Refrigerator and compressor rotating speed control method thereof

Abstract

According to the refrigerator and the compressor rotating speed control method thereof, when it is detected that a user opens a refrigerator door, the rotating speed of the compressor is controlled to be reduced to the first target rotating speed from the reference rotating speed, at the moment, noise of the compressor can be reduced, and then when it is detected that the refrigerator door is closed within the first preset time period, the compressor is controlled to rotate. Controlling the rotating speed of the compressor to rise from the first target rotating speed to a second target rotating speed; wherein the second target rotating speed is larger than the reference rotating speed, and after the refrigerator door is closed, the user is far away from the refrigerator, so that the rotating speed of the compressor can be increased, the temperature of the storage chamber can be rapidly increased, noise sensed when the user opens the refrigerator door can be effectively reduced, and meanwhile the refrigeration requirement of the storage chamber can be met.

Description

Technical Field

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

[0002] Refrigerators are commonly used household appliances for food preservation. Inverter refrigerators are equipped with variable-speed compressors. Compared to compressors with constant speed, variable-speed compressors use a control method or means to continuously adjust their speed within a certain range, continuously varying their output power. Variable-speed compressors adjust their speed based on set operating conditions, maximizing compressor performance under fixed conditions while meeting energy consumption and noise requirements. However, refrigerators with variable-speed compressors are more likely to be perceived by users due to the close proximity they bring to the refrigerator door when opening, resulting in a poor user experience. Summary of the Invention

[0003] An object of the embodiments of the present invention is to provide a refrigerator and a method for controlling the speed of a compressor thereof, which can effectively reduce the noise perceived by a user when opening the refrigerator door.

[0004] To achieve the above object, an embodiment of the present invention provides a refrigerator, comprising:

[0005] a box body, in which at least one storage chamber is formed;

[0006] A door is provided at the opening of the storage chamber and is used to open and close the storage chamber;

[0007] A door opening and closing sensor is provided at the box door and is used to detect the opening and closing of the box door;

[0008] a compressor, disposed within the housing, for providing power for a refrigeration cycle of the refrigerator;

[0009] A controller, for controlling at least the compressor, wherein the controller is configured to:

[0010] Obtaining a door signal detected by the door opening and closing sensor, and when the door signal indicates that the door of the storage room is opened, recording the current speed of the compressor as a reference speed;

[0011] controlling the speed of the compressor to decrease from the reference speed to a first target speed;

[0012] When it is detected that the door is closed within a first preset time period, the speed of the compressor is controlled to increase from a first target speed to a second target speed; wherein the second target speed is greater than the reference speed.

[0013] As an improvement to the above solution, the refrigerator further includes:

[0014] a fan, disposed in the air duct of the storage chamber, for conveying the cold air output by the refrigeration system into the storage chamber;

[0015] The controller is further configured to:

[0016] When it is detected that the door is not closed within a first preset time period, the fan is started and the speed of the compressor is controlled to increase from a first target speed to a second target speed.

[0017] As an improvement to the above solution, after controlling the speed of the compressor to increase from the first target speed to the second target speed, the controller is further configured to:

[0018] Obtaining an operating time of the compressor operating at the second target speed;

[0019] When the operating time reaches a preset operating time threshold, the speed of the compressor is controlled to decrease from the second target speed to the reference speed.

[0020] As an improvement to the above solution, when it is detected that the door is not closed after a preset time period, the controller is further configured to:

[0021] Issue a door closing reminder message.

[0022] As an improvement to the above solution, controlling the speed of the compressor to increase from the first target speed to the second target speed includes:

[0023] The rotation speed of the compressor is controlled to increase step by step from a first target rotation speed to a second target rotation speed within a second preset time period.

[0024] As an improvement to the above solution, controlling the speed of the compressor to decrease from the second target speed to the reference speed includes:

[0025] The speed of the compressor is controlled to decrease from the second target speed to the reference speed within a third preset time period.

[0026] As an improvement to the above solution, the first target speed is a preset minimum speed of the compressor, and the controller is further configured to:

[0027] If the reference speed is equal to the first target speed, the speed of the compressor is controlled to remain unchanged at the reference speed.

[0028] To achieve the above-mentioned object, an embodiment of the present invention further provides a method for controlling the speed of a refrigerator compressor, comprising:

[0029] When the door of the storage compartment in the refrigerator is detected to be opened, the current speed of the compressor is recorded as the reference speed;

[0030] controlling the speed of the compressor to decrease from the reference speed to a first target speed;

[0031] When it is detected that the door is closed within a first preset time period, the speed of the compressor is controlled to increase from a first target speed to a second target speed; wherein the second target speed is greater than the reference speed.

[0032] As an improvement to the above solution, the method further includes:

[0033] When it is detected that the door is not closed within a first preset time period, the fan in the refrigerator is started, and the speed of the compressor is controlled to increase from a first target speed to a second target speed.

[0034] As an improvement to the above solution, after controlling the speed of the compressor to increase from the first target speed to the second target speed, the method further includes:

[0035] Obtaining an operating time of the compressor operating at the second target speed;

[0036] When the operating time reaches a preset operating time threshold, the speed of the compressor is controlled to decrease from the second target speed to the reference speed.

[0037] Compared to the prior art, the refrigerator and its compressor speed control method disclosed in the present invention control the compressor speed to decrease from the reference speed to a first target speed when detecting that the user has opened the refrigerator door, thereby reducing the noise of the compressor. Then, when detecting that the refrigerator door is closed within a first preset time period, the compressor speed is controlled to increase from the first target speed to a second target speed. The second target speed is greater than the reference speed. After the refrigerator door is closed, the user has already left the refrigerator, so the compressor speed can be increased, which can quickly heat up the storage compartment and effectively reduce the noise perceived by the user when opening the refrigerator door. At the same time, it can also meet the cooling needs of the storage compartment. In addition, after the refrigerator door is opened, the compressor speed is controlled to decrease in steps to adapt to human hearing. After the door is closed, the speed is increased in steps according to time, exceeding the original speed and holding the temperature for a certain period of time to avoid the risk of food spoilage caused by high temperature. After a certain period of high speed, the speed is returned to the original speed to ensure that the energy consumption of the product does not exceed the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 1 is a schematic diagram of the external structure of a refrigerator provided by an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the internal structure of a refrigerator provided by an embodiment of the present invention;

[0040] Figure 31 is a schematic structural diagram of a refrigeration system in a refrigerator provided by an embodiment of the present invention;

[0041] Figure 4 1 is a schematic diagram of the connection between the controller and its control components provided by an embodiment of the present invention;

[0042] Figure 5 This is a first working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0043] Figure 6 This is a second working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0044] Figure 7 This is a third working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0045] Figure 8 This is a fourth working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0046] Figure 9 is a fifth working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0047] Figure 10 This is a flow chart of a refrigerator compressor speed control method provided by an embodiment of the present invention.

[0048] Among them, 100, refrigerator; 10, display screen; 11, refrigerator compartment; 12, freezer compartment; 1, compressor; 2, evaporator; 3, capillary tube; 4, condenser. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0050] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0051] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0053] See also Figure 1 , Figure 1 It is a schematic diagram of the external structure of a refrigerator 100 provided in an embodiment of the present invention. The refrigerator 100 of this embodiment has an approximately rectangular parallelepiped shape. The refrigerator includes a box body that defines a storage space and a plurality of door bodies provided at the opening of the box body, wherein the door body includes a door body shell located on the outside of the box body, a door body liner located on the inside of the box body, an upper end cover, a lower end cover, and an insulation layer located between the door body shell, the door body liner, the upper end cover, and the lower end cover; usually, the insulation layer is filled with foam material. The box body is provided with a cavity, wherein the cavity includes a component storage cavity for placing components in the refrigerator, such as a press cabin, etc., and also includes a storage space for storing food, etc. The door of the refrigerator is provided with a display screen 10, and the display screen is used to display refrigerator operating parameters and receive user touch operations.

[0054] See also Figure 2 , Figure 2 This is a schematic diagram of the internal structure of a refrigerator provided by an embodiment of the present invention. The storage space can be divided into multiple storage rooms. The storage rooms can be configured as a refrigerator 11 and a freezer 12 according to different uses. They can also include a variable temperature room, a vacuum drawer, a moisturizing drawer, etc. Each storage room corresponds to one or more doors, for example, Figure 2 The storage room in the middle and upper part is provided with a double-door body. 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 realize drawer-like storage.

[0055] See also Figure 3 , Figure 3The schematic diagram of the structure of the refrigeration system in the refrigerator 100 provided in the embodiment of the present invention, the refrigeration system includes a compressor 1, an evaporator 2, a drying filter (not shown in the figure), a capillary tube 3, a condenser 4 and a gas-liquid separator (not shown in the figure). The working process of the refrigeration system includes a compression process, a condensation process, a throttling process and an evaporation process. The compression process is: plug in the power cord of the refrigerator, when the contacts of the thermostat are connected, the compressor 1 starts to work, the low-temperature, low-pressure refrigerant is sucked into the compressor 1, and is compressed into a high-temperature, high-pressure superheated gas in the cylinder of the compressor 1 and then discharged into the condenser 4; the condensation process is: the high-temperature, high-pressure refrigerant gas dissipates heat through the condenser 4, the temperature continues to drop, and is gradually cooled to a saturated vapor at room temperature and high pressure, and is further cooled to a saturated liquid, and 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; the throttling process is as follows ... The process is as follows: the saturated refrigerant liquid after condensation is filtered out of moisture and impurities by a drying filter and then flows into the capillary tube 3, through which it is throttled and depressurized, and the refrigerant becomes wet steam at room temperature and low pressure; the evaporation process is as follows: the wet steam at room temperature and low pressure begins to absorb heat and vaporize in the evaporator 2, which not only reduces the temperature of the evaporator 2 and its surroundings, but also turns the refrigerant into a low-temperature, low-pressure gas. The refrigerant coming out of the evaporator 2 passes through the gas-liquid separator and returns to the compressor 1 again, repeating the above process to transfer the heat in the refrigerator to the air outside the box, thereby achieving the purpose of refrigeration.

[0056] Figure 4 : is a connection diagram of the controller and its control components provided by an embodiment of the present invention, wherein the refrigerator further comprises:

[0057] a fan, disposed in the air duct of the storage chamber, for conveying the cold air output by the refrigeration system into the storage chamber;

[0058] A door opening and closing sensor is provided at the box door and is used to detect the opening and closing of the box door;

[0059] The ambient temperature sensor is arranged outside the box and is used to detect the ambient temperature.

[0060] The controller is connected to the compressor 1, the fan, the door opening / closing sensor, and the ambient temperature sensor. The compressor is a variable-frequency compressor, and the controller can adjust its speed. The controller can also control the fan's on / off state and adjust its speed. The controller can receive door signals detected by the door opening / closing sensor, which can include signals indicating a storage compartment door is open or closed. It is understood that the door opening / closing sensors can be configured based on the number of doors. For example, one door opening / closing sensor is configured for each door, and this sensor only detects the door signal for its corresponding door. The ambient temperature sensor is used to detect the ambient temperature. Depending on the ambient temperature, the refrigerator has two speed settings, low and high, within a specific temperature range. The speeds corresponding to different ambient temperatures Te are shown in Table 1. The corresponding speeds are P2>P3>P1>P4>P5>P6.

[0061]

[0062]

[0063] When the ambient temperature satisfies: 35≤Te, the adjustable speed of the compressor is between P1 and P2; when the ambient temperature satisfies: 29≤Te<35, the adjustable speed of the compressor is between P4 and P3; when the ambient temperature satisfies: 22≤Te<29, the adjustable speed of the compressor is between P4 and P3; when the ambient temperature satisfies: 19≤Te<22, the adjustable speed of the compressor is between P4 and P3; when the ambient temperature satisfies: 14≤Te<19, the adjustable speed of the compressor is between P5 and P3; when the ambient temperature satisfies: Te<14, the adjustable speed of the compressor is between P6 and P3. It is worth noting that the ambient temperature ranges and corresponding speed settings in Table 1 are for reference only. In actual applications, they can be divided into other ambient temperature ranges, which are all within the scope of protection of the present invention.

[0064] Specifically, the controller in the refrigerator controls at least the compressor, and the controller is configured to: obtain the door signal detected by the door opening and closing sensor, and when the door signal indicates that the storage chamber door is opened, record the current speed of the compressor as the reference speed; control the speed of the compressor to decrease from the reference speed to a first target speed; when it is detected that the door is closed within a first preset time period, control the speed of the compressor to increase from the first target speed to a second target speed; wherein, the second target speed is greater than the reference speed.

[0065] For example, see Figure 5 , Figure 5 This is a first workflow diagram of a controller in a refrigerator provided by an embodiment of the present invention. The controller is configured to execute steps S11 to S17. The first target speed is the preset minimum speed of the compressor, and the second target speed is the preset maximum speed of the compressor. For example, the first target speed is P6 and the second target speed is P2. The first preset time period T1 is the time set in the system to prompt the door to close. Leaving the door open for an extended period will cause the temperature inside the refrigerator to rise. For example, the first preset time period T1 is 2 minutes.

[0066] Exemplarily, when the refrigerator is operating, a door signal sent by the door opening and closing sensor is obtained. When the door signal indicates that the storage compartment door is opened, the current speed of the compressor is recorded as the reference speed. If the ambient temperature satisfies the condition 19≤Te<22, and the current speed of the compressor is P4, then the reference speed is P4. Since the user has opened the refrigerator door, the compressor speed needs to be reduced. Therefore, the compressor speed is controlled to be reduced from the reference speed to the first target speed, that is, the compressor speed is reduced from P4 to P6. At the same time, the fan can be turned off to allow cold air to slowly flow into the storage compartment, further reducing refrigerator noise. If the refrigerator door is detected to be closed within the first preset time period T1, since the refrigerator door is already closed, the compressor speed can be increased to compensate for the cooling capacity lost when the speed was reduced, thereby achieving the purpose of rapid cooling. At this time, the compressor speed is controlled to be increased from the first target speed to the second target speed, that is, the compressor speed is increased from P6 to P2.

[0067] Specifically, controlling the speed of the compressor to increase from the first target speed to the second target speed includes: controlling the speed of the compressor to increase step by step from the first target speed to the second target speed within a second preset time period.

[0068] For example, the second preset time period T2 is set to 30 seconds to 1 minute. This timing is set for two main purposes: first, to avoid excessively rapid speed increases, which could alert the user to an abnormality. The temperature is slowly increased over a certain period of time, indicating that the user has left the interactive area; and second, to avoid excessively slow speed increases, which could prevent the refrigerator temperature from decreasing quickly enough. Assuming the first target speed is P6 and the second target speed is P2, the compressor speed increase process satisfies the following: P6 → P5 → P4 → P1 → P3 → P2.

[0069] Specifically, the controller is further configured to: when it is detected that the door is not closed within a first preset time period, start the fan and control the speed of the compressor to increase from a first target speed to a second target speed.

[0070] For example, see Figure 6 , Figure 6 This is a second working flow chart of a controller in a refrigerator provided by an embodiment of the present invention. When the controller detects that the door is not closed after executing step S16 and determining that it is within the first preset time period, it is also used to execute step S161. At this time, the fan is started. Starting the fan can allow the cold air in the air duct to continue to flow into the storage chamber, making up for the loss of cold air caused by not closing the door for a long time. Even if the fan is started at this time, in order to avoid excessive loss of cold air in the storage chamber, regardless of the noise problem, priority is given to ensuring that the storage chamber has sufficient cold air.

[0071] Specifically, after controlling the speed of the compressor to increase from the first target speed to the second target speed, the controller is also configured to: obtain the operating time of the compressor running at the second target speed; when the operating time reaches a preset operating time threshold, control the speed of the compressor to decrease from the second target speed to the reference speed.

[0072] For example, see Figure 7 , Figure 7 This is a third workflow diagram of a controller in a refrigerator provided by an embodiment of the present invention. After executing step S17, the controller is further configured to execute steps S18 to S20. After controlling the speed of the compressor to increase from the first target speed to the second target speed, the operating time of the compressor running at the second target speed is obtained; when the operating time reaches a preset operating time threshold, it means that the compressor has been running at a high speed for a long time and the temperature of the storage chamber has returned to the temperature before the door was opened. Therefore, the speed of the compressor can be controlled to return to the speed before the door was opened. At this time, the speed of the compressor is controlled to decrease from the second target speed to the reference speed, that is, the speed of the compressor is reduced from P2 to P4.

[0073] Specifically, controlling the speed of the compressor to decrease from the second target speed to the reference speed includes: controlling the speed of the compressor to decrease from the second target speed to the reference speed within a third preset time period.

[0074] For example, the third preset time period T3 is set to mitigate the impact of the control mode on energy consumption. When the compressor runs at high speed, energy consumption increases. Long run times can affect the product's energy efficiency level, while short run times can't mitigate the impact of temperature increases caused by the door. Assuming the reference speed is P4 and the second target speed is P2, the compressor speed reduction process follows the following sequence: P2 → P3 → P1 → P4.

[0075] Specifically, when it is detected that the door is not closed after a preset time period, the controller is further configured to: issue a door closing prompt message.

[0076] For example, see Figure 8 , Figure 8 This is a fourth workflow diagram of a refrigerator controller provided by an embodiment of the present invention. After executing step S16 and determining that the refrigerator door is not closed within a first preset time period, the controller is further configured to execute step S161, at which point a door-close prompt is issued. If the door is not closed after the first preset time period T1, a beeping tone is initially emitted to alert the user to a product anomaly. The speed is then increased. Based on psychoacoustics, this noise level is increased, making it more tolerable to users while maintaining a certain level of cooling performance.

[0077] Specifically, the controller is further configured to: if the reference speed is equal to the first target speed, control the speed of the compressor to remain unchanged at the reference speed.

[0078] For example, see Figure 9 , Figure 9 This is a fifth workflow diagram of a controller in a refrigerator provided by an embodiment of the present invention. After executing step S14, the controller is further configured to execute steps S141 to S143. When the refrigerator is at the lowest ambient temperature, the low-speed operation noise corresponding to the user mode is sufficiently low. In this case, the reference speed will be equal to the first target speed. In this case, there is no need to adjust the compressor speed. This is also because the product's lowest speed often corresponds to the lowest usable speed of the compressor. If it is lower, the compressor performance and failure prevention cannot be guaranteed.

[0079] Compared to the prior art, the refrigerator disclosed in the present invention controls the compressor speed to decrease from the reference speed to a first target speed when detecting that the user has opened the refrigerator door, thereby reducing the noise of the compressor. Then, when detecting that the refrigerator door is closed within a first preset time period, the compressor speed is controlled to increase from the first target speed to a second target speed. The second target speed is greater than the reference speed. After the refrigerator door is closed, the user has already left the refrigerator, so the compressor speed can be increased, enabling the storage compartment to heat up quickly and effectively reducing the noise perceived by the user when opening the refrigerator door, while also meeting the storage compartment's cooling needs. Furthermore, after the refrigerator door is opened, the compressor speed is controlled to decrease in steps to suit human hearing. After the door is closed, the speed is increased in steps over time, exceeding the original speed for a certain period of time to prevent the risk of food spoilage caused by high temperatures. After a certain period of high speed, the speed is returned to the original speed, ensuring that the product's energy consumption does not exceed requirements.

[0080] See also Figure 10 , Figure 10This is a flow chart of a refrigerator compressor speed control method provided by an embodiment of the present invention. The refrigerator compressor speed control method is implemented by a controller in the refrigerator. The refrigerator compressor speed control method includes:

[0081] S1. When detecting that the door of the storage compartment of the refrigerator is opened, recording the current speed of the compressor as a reference speed;

[0082] S2. controlling the speed of the compressor to decrease from the reference speed to a first target speed;

[0083] S3. When it is detected that the door is closed within a first preset time period, the speed of the compressor is controlled to increase from a first target speed to a second target speed; wherein the second target speed is greater than the reference speed.

[0084] Specifically, the method further includes: when it is detected that the door is not closed within a first preset time period, starting the fan in the refrigerator and controlling the speed of the compressor to increase from a first target speed to a second target speed.

[0085] Specifically, after controlling the speed of the compressor to increase from the first target speed to the second target speed, the method further includes: obtaining the operating time of the compressor running at the second target speed; when the operating time reaches a preset operating time threshold, controlling the speed of the compressor to decrease from the second target speed to the reference speed.

[0086] Specifically, when it is detected that the door is not closed after a preset time period, the method further includes: issuing a door closing prompt message.

[0087] Specifically, controlling the speed of the compressor to increase from the first target speed to the second target speed includes: controlling the speed of the compressor to increase step by step from the first target speed to the second target speed within a second preset time period.

[0088] Specifically, controlling the speed of the compressor to decrease from the second target speed to the reference speed includes: controlling the speed of the compressor to decrease from the second target speed to the reference speed within a third preset time period.

[0089] Specifically, the first target speed is a preset minimum speed of the compressor. The method further includes: if the reference speed is equal to the first target speed, controlling the speed of the compressor to maintain the reference speed unchanged.

[0090] It is worth noting that the working process of the refrigerator compressor speed control method described in the embodiment of the present invention can refer to the working process of the refrigerator controller described in the above embodiment, and will not be repeated here.

[0091] Compared to the prior art, the refrigerator compressor speed control method disclosed in the present invention controls the compressor speed to decrease from the reference speed to a first target speed when detecting that the user has opened the refrigerator door, thereby reducing the noise of the compressor. Then, when detecting that the refrigerator door is closed within a first preset time period, the compressor speed is controlled to increase from the first target speed to a second target speed. The second target speed is greater than the reference speed. After the refrigerator door is closed, the user has already left the refrigerator, so the compressor speed can be increased, which can quickly heat up the storage compartment and effectively reduce the noise perceived by the user when opening the refrigerator door, while also meeting the storage compartment's cooling needs. Furthermore, after the refrigerator door is opened, the compressor speed is controlled to decrease in steps to suit human hearing. After the door is closed, the speed is increased in steps over time, exceeding the original speed and holding the temperature for a certain period of time to avoid the risk of food spoilage caused by high temperatures. After a certain period of high speed, the speed is returned to the original speed to ensure that the product's energy consumption does not exceed requirements.

[0092] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles 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: a box body, in which at least one storage chamber is formed; A door is provided at the opening of the storage chamber and is used to open and close the storage chamber; A door opening and closing sensor is provided at the box door and is used to detect the opening and closing of the box door; a compressor, disposed within the housing, for providing power for a refrigeration cycle of the refrigerator; A controller, for controlling at least the compressor, wherein the controller is configured to: Obtaining a door signal detected by the door opening and closing sensor, and when the door signal indicates that the door of the storage room is opened, recording the current speed of the compressor as a reference speed; controlling the speed of the compressor to decrease from the reference speed to a first target speed; When it is detected that the door is closed within a first preset time period, the speed of the compressor is controlled to increase from a first target speed to a second target speed; wherein the second target speed is greater than the reference speed.

2. The refrigerator according to claim 1, wherein The refrigerator further comprises: a fan, disposed in the air duct of the storage chamber, for conveying the cold air output by the refrigeration system into the storage chamber; The controller is further configured to: When it is detected that the door is not closed within a first preset time period, the fan is started and the speed of the compressor is controlled to increase from a first target speed to a second target speed.

3. The refrigerator according to claim 1 or 2, wherein: After controlling the speed of the compressor to increase from the first target speed to the second target speed, the controller is further configured to: Obtaining an operating time of the compressor operating at the second target speed; When the operating time reaches a preset operating time threshold, the speed of the compressor is controlled to decrease from the second target speed to the reference speed.

4. The refrigerator according to claim 1, wherein When it is detected that the door is not closed after a preset time period, the controller is further configured to: Issue a door closing reminder message.

5. The refrigerator according to claim 1 or 2, wherein: The controlling the speed of the compressor to increase from the first target speed to the second target speed includes: The rotation speed of the compressor is controlled to increase step by step from a first target rotation speed to a second target rotation speed within a second preset time period.

6. The refrigerator according to claim 3, wherein: The controlling the speed of the compressor to decrease from the second target speed to the reference speed includes: The speed of the compressor is controlled to decrease from the second target speed to the reference speed within a third preset time period.

7. The refrigerator according to claim 1, wherein The first target speed is a preset minimum speed of the compressor, and the controller is further configured to: If the reference speed is equal to the first target speed, the speed of the compressor is controlled to remain unchanged at the reference speed.

8. A method for controlling the speed of a refrigerator compressor, characterized in that: include: When the door of the storage compartment in the refrigerator is detected to be opened, the current speed of the compressor is recorded as the reference speed; controlling the speed of the compressor to decrease from the reference speed to a first target speed; When it is detected that the door is closed within a first preset time period, the speed of the compressor is controlled to increase from a first target speed to a second target speed; wherein the second target speed is greater than the reference speed.

9. The method for controlling the rotation speed of a refrigerator compressor according to claim 8, wherein: The method further comprises: When it is detected that the door is not closed within a first preset time period, the fan in the refrigerator is started, and the speed of the compressor is controlled to increase from a first target speed to a second target speed.

10. The method for controlling the rotation speed of a refrigerator compressor according to claim 8 or 9, wherein: After controlling the speed of the compressor to increase from the first target speed to the second target speed, the method further includes: Obtaining an operating time of the compressor operating at the second target speed; When the operating time reaches a preset operating time threshold, the speed of the compressor is controlled to decrease from the second target speed to the reference speed.

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