Refrigeration equipment and control method thereof

Abstract

The invention discloses refrigeration equipment and a control method thereof, and belongs to the technical field of refrigeration equipment. The refrigeration equipment comprises a controller and a refrigeration system; the refrigeration system comprises a compressor; a condenser; a freezing branch; an inlet of the refrigeration evaporator is connected with an outlet of the condenser, and an outlet of the refrigeration evaporator is communicated with an inlet of the freezing evaporator; the bypass valve is connected between an outlet of the compressor and an inlet of the freezing evaporator; the controller is configured to control the compressor to keep working under the condition that the defrosting condition is met, and control the condenser and the refrigeration evaporator to keep communicating for a first target duration; and then controlling the bypass valve to be disconnected for a second target duration between the inlet of the condenser and the inlet of the refrigeration evaporator, between the inlet of the condenser and the inlet of the freezing evaporator and between the inlet of the condenser and the inlet of the freezing evaporator, and then controlling the bypass valve to be opened. By reducing the liquid refrigerant circulating in the loop during defrosting, the risk that the compressor is damaged due to the fact that the liquid refrigerant flows back into the compressor can be reduced.

Description

Technical Field

[0001] This application belongs to the field of refrigeration equipment technology, and in particular relates to a refrigeration device and its control method. Background Technology

[0002] In related technologies, when a refrigerator operates in hot gas defrosting mode, the refrigeration system changes the flow direction of the refrigerant, introducing the high-temperature, high-pressure gaseous refrigerant in reverse into the evaporator to quickly melt the frost layer accumulated on its surface. However, the evaporator and its connecting pipes will experience significant temperature and pressure changes, and a large amount of liquid refrigerant produced during defrosting will not be completely vaporized. The excess liquid refrigerant is prone to migrate and flow back into the compressor under the influence of the system pressure difference, which may lead to the risk of damage to the compressor due to liquid slugging. There is room for improvement. Summary of the Invention

[0003] This application aims to at least solve one of the technical problems existing in the related art. To this end, this application proposes a refrigeration device and its control method, which can reduce the risk of compressor damage caused by liquid refrigerant flowing back into the compressor.

[0004] In a first aspect, this application provides a refrigeration device, comprising: A controller and a refrigeration system, the refrigeration system comprising: compressor; A condenser, the inlet of which is connected to the outlet of the compressor; A refrigeration branch circuit, wherein the inlet of the refrigeration evaporator in the refrigeration branch circuit is connected to the outlet of the condenser, and the outlet of the refrigeration evaporator is connected to the inlet of the compressor; A refrigerated branch circuit, wherein the inlet of the refrigerated evaporator in the refrigerated branch circuit is connected to the outlet of the condenser, and the outlet of the refrigerated evaporator is connected to the inlet of the refrigerated evaporator; A bypass valve is connected between the outlet of the compressor and the inlet of the refrigeration evaporator; The controller is configured to, when defrosting conditions are met, control the compressor to continue operating, and control the condenser and the refrigeration evaporator to remain connected for a first target duration, then control the inlet of the condenser and the inlet of the refrigeration evaporator, the inlet of the condenser and the inlet of the freezing evaporator, and the bypass valve to remain disconnected for a second target duration, and then control the bypass valve to open, so that the compressor and the freezing evaporator are connected through the bypass valve.

[0005] In the above technical solution, by reducing the amount of liquid refrigerant circulating in the circuit during defrosting, the risk of compressor damage caused by liquid refrigerant flowing back into the compressor can be reduced.

[0006] According to one embodiment of this application, the refrigeration branch further includes a refrigeration capillary, the inlet of which is connected to the outlet of the condenser, the outlet of which is connected to the inlet of the refrigeration evaporator, and the outlet of the refrigeration evaporator is connected between the refrigeration capillary and the refrigeration evaporator. The refrigeration branch also includes a refrigeration capillary tube, the inlet of which is connected to the outlet of the condenser, and the outlet of which is connected to the inlet of the refrigeration evaporator.

[0007] In the above technical solution, the outlet of the refrigeration evaporator is connected between the refrigeration capillary tube and the refrigeration evaporator, which helps to improve energy efficiency.

[0008] According to one embodiment of this application, the refrigeration system further includes: a three-way valve, wherein a first valve port of the three-way valve is connected to the outlet of the condenser, a second valve port of the three-way valve is connected to the refrigeration branch, and a third valve port of the three-way valve is connected to the freezing branch, and the three-way valve is configured such that at least one of the second valve port and the third valve port is selectively connected to the first valve port.

[0009] According to one embodiment of this application, the refrigeration system further includes: A drying filter is connected between the condenser and the first port of the three-way valve.

[0010] In the above technical solution, the dryer filter is located upstream of the refrigeration capillary tube and the freezing capillary tube. The dryer filter is mainly used to remove moisture from the refrigerant, thereby reducing the failure risk of the refrigeration capillary tube and the freezing capillary tube.

[0011] According to one embodiment of this application, the refrigeration system further includes a refrigeration fan and a condenser fan, both of which are configured to be selectively turned on in defrost mode.

[0012] In the above technical solutions, the operation of both the refrigeration fan and the condenser fan helps to increase the proportion of liquid refrigerant in the total refrigerant volume.

[0013] According to one embodiment of this application, the controller is configured to determine the first target duration and the second target duration based on the compressor's operating information and the refrigerant charge of the refrigeration system.

[0014] In the above technical solution, by determining the first target duration and the second target duration, the amount of refrigerant transferred can be reasonably controlled, thereby reducing the risk of insufficient refrigerant during the defrosting process.

[0015] Secondly, this application provides a control method for a refrigeration device as described in any one of the above statements, comprising: Once the defrosting conditions are determined to be met, the compressor is kept running, and the condenser and the refrigeration evaporator are kept in contact. After the first target duration is reached, the outlet of the condenser and the inlet of the refrigeration evaporator, the outlet of the condenser and the inlet of the freezing evaporator, and the bypass valve are kept disconnected. After the second target duration is reached, the bypass valve is opened.

[0016] According to one embodiment of this application, when the refrigeration system includes a three-way valve, controlling the compressor to continue operating and controlling the condenser to remain in communication with the refrigeration evaporator when defrosting conditions are met includes: Control the operation of the compressor and connect the first valve port of the three-way valve to the second valve port of the three-way valve.

[0017] According to one embodiment of this application, when the refrigeration system includes a three-way valve, the step of keeping the connection between the inlet of the condenser and the inlet of the refrigeration evaporator, the connection between the inlet of the condenser and the inlet of the freezing evaporator, and the bypass valve disconnected after the first target duration is reached includes: After the condenser and the refrigerated evaporator have been connected for the first target duration, the first valve port of the three-way valve is disconnected from the second valve port, the third valve port of the three-way valve is disconnected from the second valve port, and the bypass valve remains disconnected.

[0018] According to one embodiment of this application, controlling the bypass valve to open after the second target duration is reached includes: After the time between the inlet of the condenser and the inlet of the refrigeration evaporator, between the inlet of the condenser and the inlet of the freezing evaporator, and after the bypass valve remains closed for the second target duration, the on / off solenoid valve is opened.

[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of the refrigeration system provided in the embodiments of this application; Figure 2 This is a flowchart of the refrigeration system provided in the embodiments of this application.

[0021] Figure label: Refrigeration system 1; Compressor 10, condenser 20, dryer filter 30; Three-way valve 40, first valve port 40a, second valve port 40b, third valve port 40c; Refrigeration evaporator 50, refrigeration capillary tube 60, refrigeration evaporator 70, refrigeration capillary tube 80, bypass valve 90. Detailed Implementation

[0022] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0023] This application aims to at least solve one of the technical problems existing in the related art. To this end, this application proposes a refrigeration device and its control method, which can reduce the risk of compressor damage caused by liquid refrigerant flowing back into the compressor.

[0024] The following is for reference. Figure 1 and Figure 2 This application describes a refrigeration device according to an embodiment of the present application.

[0025] like Figure 1 As shown, the refrigeration equipment includes a controller and a refrigeration system 1. The refrigeration system 1 includes: Compressor 10; Condenser 20, the inlet of condenser 20 is connected to the outlet of compressor 10; The refrigeration branch has its inlet of the refrigeration evaporator 50 connected to the outlet of the condenser 20, and the outlet of the refrigeration evaporator 50 connected to the inlet of the compressor 10. The refrigerated branch circuit has its inlet of the refrigerated evaporator 70 connected to the outlet of the condenser 20, and its outlet connected to the inlet of the refrigerated evaporator 70. A bypass valve 90 is connected between the outlet of the compressor 10 and the inlet of the refrigeration evaporator 50; The controller is configured to keep the compressor 10 running when the defrosting conditions are met, and to keep the condenser 20 and the refrigerated evaporator 70 connected for a first target duration, then keep the inlet of the condenser 20 and the inlet of the refrigerated evaporator 70, the inlet of the condenser 20 and the inlet of the frozen evaporator 50, and the bypass valve 90 disconnected for a second target duration, and then open the bypass valve 90, so that the compressor 10 and the frozen evaporator 50 are connected through the bypass valve 90.

[0026] In this embodiment, the refrigeration system 1 may include a compressor 10, a condenser 20, a refrigeration branch and a refrigeration branch. The inlet of the condenser 20 is connected to the outlet of the compressor 10. The outlet of the condenser 20 can be selectively connected to the refrigeration branch or the refrigeration branch through a three-way valve 40. The first valve port 40a of the three-way valve 40 is connected to the outlet of the condenser 20, the second valve port 40b of the three-way valve 40 is connected to the refrigeration branch, and the third valve port 40c of the three-way valve 40 is connected to the refrigeration branch. By switching the three-way valve 40, the connection relationship between the condenser 20, the refrigeration branch and the refrigeration branch can be controlled.

[0027] In the refrigeration branch, the inlet of the refrigeration evaporator 50 is connected to the outlet of the condenser 20, and the outlet of the refrigeration evaporator 50 is connected to the inlet of the compressor 10. The gaseous refrigerant flowing out of the compressor 10 flows through the condenser 20 and becomes liquid refrigerant. The liquid refrigerant absorbs heat in the refrigeration evaporator 50 and becomes gaseous refrigerant, returning to the compressor 10. In the refrigeration branch, the inlet of the refrigeration evaporator 70 is connected to the outlet of the condenser 20, and the outlet of the refrigeration evaporator 70 is connected to the inlet of the refrigeration evaporator 50. The gaseous refrigerant flowing out of the compressor 10 flows through the condenser 20 and becomes liquid refrigerant. The liquid refrigerant flows through the refrigeration evaporator 70 and the refrigeration evaporator 50 in sequence, becoming gaseous refrigerant and returning to the compressor 10.

[0028] The evaporator primarily lowers the air temperature by absorbing heat through the circulation of refrigerant. When the refrigerant evaporates in the evaporator, the evaporator absorbs heat from the air. As the air temperature decreases, water vapor in the air condenses into water droplets or forms frost. The refrigeration evaporator 50 is used to lower the temperature of the freezer compartment, and the refrigeration evaporator 70 is used to lower the temperature of the refrigerator compartment. The temperature of the refrigerator compartment is usually above zero degrees Celsius, and water vapor in the refrigerator compartment will condense into water droplets at the refrigeration evaporator 70. The temperature of the freezer compartment is usually below zero degrees Celsius, and water vapor in the freezer compartment will form frost at the refrigeration evaporator 50. Therefore, the defrosting mode mainly defrosts the refrigeration evaporator 50.

[0029] In addition, the refrigeration system 1 also includes a bypass valve 90, which is connected between the outlet of the compressor 10 and the inlet of the refrigeration evaporator 50. In the refrigeration mode, the bypass valve 90 is closed, and the refrigerant circulates in the refrigeration circuit consisting of the compressor 10, the condenser 20, the refrigeration branch and the cold storage branch. In the defrost mode, the bypass valve 90 is open, and the refrigerant circulates in the defrost circuit consisting of the compressor 10 and the refrigeration evaporator 50.

[0030] The refrigeration equipment includes a controller and a refrigeration system 1. For example, the refrigeration equipment includes, but is not limited to, refrigerators, vending machines and display cases, wherein refrigerators are mainly used for food storage, vending machines are used for storing and selling food and daily necessities, and display cases are used for displaying and storing food and other goods. All of these require maintaining a low-temperature environment to extend the shelf life of the food.

[0031] The controller is configured to perform defrosting in two stages when the defrosting conditions are met. The preset duration of the first stage is the first target duration, and the preset duration of the second stage is the second target duration. The compressor 10 continues to operate in the first stage, the second stage, and the defrosting stage.

[0032] In the first stage, the outlet of compressor 10 is connected to the inlet of condenser 20, the outlet of condenser 20 is connected to the inlet of refrigeration branch, the outlet of refrigeration branch is connected to the inlet of refrigeration evaporator 50 of refrigeration branch, and the outlet of refrigeration evaporator 50 is connected to the inlet of compressor 10. Both gaseous refrigerant and liquid refrigerant circulate in the loop. When the duration of the first stage reaches the first target duration, the liquid refrigerant is stored in refrigeration evaporator 70 during the flow process.

[0033] In the second stage, the outlet of the evaporator 50 is connected to the inlet of the compressor 10, the outlet of the compressor 10 is connected to the inlet of the condenser 20, and the outlet of the condenser 20 is not connected to either the refrigeration branch or the freezing branch. The liquid refrigerant in the evaporator 50 enters the condenser 20 through the compressor 10. When the duration of the second stage reaches the second target duration, the liquid refrigerant is stored in the condenser 20.

[0034] It should be noted that, from the first stage to the second stage, the inlet of the condenser 20 is disconnected from the inlet of the refrigeration evaporator 70, the inlet of the condenser 20 is disconnected from the inlet of the freezer evaporator 50, and the bypass valve 90 is disconnected.

[0035] In addition, during the defrosting stage, the bypass valve 90 is opened, and the compressor 10 and the refrigeration evaporator 50 are connected through the bypass valve 90. At this time, the gaseous refrigerant circulates in the loop consisting of the compressor 10, the refrigeration evaporator 50 and the bypass valve 90.

[0036] In related technologies, when a refrigerator operates in hot gas defrosting mode, the refrigeration system changes the flow direction of the refrigerant, introducing the high-temperature, high-pressure gaseous refrigerant in reverse into the evaporator to quickly melt the frost layer accumulated on its surface. However, the evaporator and its connecting pipes will experience significant temperature and pressure changes, and a large amount of liquid refrigerant produced during defrosting will not be completely vaporized. The excess liquid refrigerant is prone to migrate and flow back into the compressor under the influence of the system pressure difference, which may lead to the risk of damage to the compressor due to liquid slugging. There is room for improvement.

[0037] This application transfers liquid refrigerant during the preparation stage before defrosting, which can significantly reduce the amount of liquid refrigerant circulating in the circuit during defrosting, thereby reducing the total amount of refrigerant circulating in the circuit during defrosting.

[0038] During the defrosting process, the high-temperature gaseous refrigerant in the circuit becomes a high-temperature liquid refrigerant in the refrigeration evaporator 50. After defrosting, due to the limited flow of refrigerant participating in the defrosting process, the limited high-temperature liquid refrigerant in the refrigeration evaporator 50 can quickly evaporate and become a high-temperature gaseous refrigerant. At the same time, the liquid refrigerant stored in the refrigeration evaporator 70 flows through the refrigeration evaporator 70 and the refrigeration evaporator 50 in sequence, and evaporates into a gaseous refrigerant before entering the compressor 10. The liquid refrigerant stored in the condenser 20 flows through the condenser 20, the refrigeration evaporator 70 and the refrigeration evaporator 50 in sequence, and also evaporates into a gaseous refrigerant before entering the compressor 10. This reduces the risk of damage to the compressor 10 due to the liquid refrigerant flowing back into the compressor 10.

[0039] According to the refrigeration equipment provided in the embodiments of this application, by reducing the amount of liquid refrigerant circulating in the circuit during defrosting, the risk of damage to the compressor 10 due to the backflow of liquid refrigerant into the compressor 10 can be reduced.

[0040] In some embodiments, such as Figure 1 As shown, the refrigeration branch also includes a refrigeration capillary 60, the inlet of which is connected to the outlet of the condenser 20, the outlet of which is connected to the inlet of the refrigeration evaporator 50, and the outlet of the refrigeration evaporator 70 is connected between the refrigeration capillary 60 and the refrigeration evaporator 50. The refrigeration branch also includes a refrigeration capillary tube 80, the inlet of which is connected to the outlet of the condenser 20, and the outlet of which is connected to the inlet of the refrigeration evaporator 70.

[0041] In this embodiment, the refrigeration system 1 includes a compressor 10, a condenser 20, a refrigeration branch, a refrigeration branch, and a bypass valve 90. The refrigeration branch includes a refrigeration capillary tube 60 and a refrigeration evaporator 50, and the refrigeration branch includes a refrigeration capillary tube 80 and a refrigeration evaporator 70. The inlet of the refrigeration capillary tube 60 is connected to the outlet of the condenser 20, the outlet of the refrigeration capillary tube 60 is connected to the inlet of the refrigeration evaporator 50, the inlet of the refrigeration capillary tube 80 is connected to the outlet of the condenser 20, and the outlet of the refrigeration capillary tube 80 is connected to the inlet of the refrigeration evaporator 70.

[0042] In addition, the outlet of the refrigeration evaporator 70 is connected between the freezing capillary tube 60 and the freezing evaporator 50, that is, the outlet of the refrigeration evaporator 70 is connected to the inlet of the freezing evaporator 50. The temperature of the refrigeration compartment is higher than that of the freezing compartment, and the refrigerant flowing through the refrigeration evaporator 70 can also cool the evaporator 50.

[0043] Understandably, the outlet of the refrigeration evaporator 70 is connected between the refrigeration capillary tube 60 and the refrigeration evaporator 50, which helps to improve energy efficiency.

[0044] In some embodiments, such as Figure 1 As shown, the refrigeration system 1 also includes a three-way valve 40. The first valve port 40a of the three-way valve 40 is connected to the outlet of the condenser 20, the second valve port 40b of the three-way valve 40 is connected to the refrigeration branch, and the third valve port 40c of the three-way valve 40 is connected to the freezing branch. The three-way valve 40 is configured such that at least one of the second valve port 40b and the third valve port 40c can be selectively connected to the first valve port 40a.

[0045] In this embodiment, the refrigeration system 1 controls the connection status of each branch by switching the three-way valve 40.

[0046] In the cooling mode, the three-way valve 40 is in the open state, the bypass valve 90 is in the closed state, the first valve port 40a of the three-way valve 40 is connected to the second valve port 40b of the three-way valve 40, and the first valve port 40a of the three-way valve 40 is connected to the third valve port 40c of the three-way valve 40. The refrigerant is divided into two paths at the three-way valve 40. One path flows sequentially through the second valve port 40b of the three-way valve 40, the refrigeration capillary tube 80, the refrigeration evaporator 70, the freezing evaporator 50, the compressor 10, and the condenser 20. The other path flows sequentially through the third valve port 40c of the three-way valve 40, the freezing capillary tube 60, the freezing evaporator 50, the compressor 10, and the condenser 20.

[0047] In the first stage of defrosting mode, the three-way valve 40 is open and the bypass valve 90 is closed. The first valve port 40a of the three-way valve 40 is connected to the second valve port 40b of the three-way valve 40. The refrigerant flows sequentially through the second valve port 40b of the three-way valve 40, the refrigeration capillary tube 80, the refrigeration evaporator 70, the freezing evaporator 50, the compressor 10, and the condenser 20. In the second stage of defrosting mode, the three-way valve 40 is closed and the bypass valve 90 is closed. The refrigerant flows sequentially through the freezing evaporator 50, the compressor 10, and the condenser 20. In the defrosting stage of defrosting mode, the three-way valve 40 is closed and the bypass valve 90 is open. The refrigerant flows sequentially through the freezing evaporator 50, the compressor 10, and the bypass valve 90.

[0048] In some embodiments, such as Figure 1As shown, the refrigeration system 1 also includes a dryer filter 30, which is connected between the condenser 20 and the first valve port 40a of the three-way valve 40.

[0049] In this embodiment, the dryer filter 30 is located upstream of the refrigeration capillary tube 80 and the freezing capillary tube 60. The dryer filter 30 is mainly used to remove moisture from the refrigerant, thereby reducing the risk of failure of the refrigeration capillary tube 80 and the freezing capillary tube 60.

[0050] Taking the presence of water in liquid refrigerant as an example, in refrigeration system 1, when the liquid refrigerant is throttled and depressurized through the capillary tube, the temperature drops sharply. At this time, the water in the liquid refrigerant will freeze into ice at the capillary tube outlet or evaporator inlet, blocking the pipe and preventing the refrigerant from flowing, thus affecting the refrigeration efficiency of the refrigeration equipment.

[0051] In some embodiments, the refrigeration system 1 further includes a refrigeration fan and a condenser fan, both of which are configured to be selectively turned on in defrost mode.

[0052] In this embodiment, the refrigeration fan is installed near the refrigeration evaporator 70, and the condenser fan is installed near the condenser 20. The refrigeration fan is mainly used to accelerate airflow, which helps the refrigerant inside the evaporator absorb heat, and the condenser fan is mainly used to accelerate the heat dissipation of the condenser 20.

[0053] Under the same conditions, turning on the refrigeration fan can improve the heat absorption efficiency of the liquid refrigerant, and turning on the condenser fan can improve the heat release efficiency of the gaseous refrigerant. For example, when the refrigeration fan is on, the proportion of the liquid refrigerant flowing through the refrigeration evaporator 70 that becomes gaseous refrigerant is greater than the proportion when the refrigeration fan is off. When the condenser fan is on, the proportion of the gaseous refrigerant flowing through the condenser 20 that becomes liquid refrigerant is greater than the proportion when the condenser fan is off.

[0054] In addition, in cooling mode, both the refrigeration fan and the condenser fan are on. In defrosting mode, both the refrigeration fan and the condenser fan can be selectively turned on. In the first stage of defrosting mode, controlling the refrigeration fan to not run can reduce the amount of refrigerant evaporation, thereby increasing the amount of liquid refrigerant stored in the refrigeration evaporator 70. In the second stage of defrosting mode, controlling the condenser fan to run can increase the amount of refrigerant condensation, thereby increasing the amount of liquid refrigerant stored in the condenser 20.

[0055] In some embodiments, the controller is configured to determine a first target duration and a second target duration based on the operating information of the compressor 10 and the refrigerant charge of the refrigeration system 1.

[0056] In this embodiment, the controller is configured to, when the defrosting conditions are met, control the compressor 10 to continue operating, and control the condenser 20 and the refrigerated evaporator 70 to remain connected for a first target duration, then control the inlet of the condenser 20 and the inlet of the refrigerated evaporator 70, the inlet of the condenser 20 and the inlet of the frozen evaporator 50, and the bypass valve 90 to remain disconnected for a second target duration, and then control the bypass valve 90 to open, so that the compressor 10 and the frozen evaporator 50 are connected through the bypass valve 90.

[0057] In addition, the controller is configured to determine a first target duration and a second target duration based on the operating information of the compressor 10 and the refrigerant charge of the refrigeration system 1, wherein the operating information of the compressor 10 includes, but is not limited to, the speed and displacement of the compressor 10, and the target duration can be the time for the refrigerant to complete one cycle in the loop.

[0058] Understandably, by determining the first and second target durations, the amount of refrigerant transferred can be reasonably controlled, thereby reducing the risk of insufficient refrigerant during the defrosting process.

[0059] This application also provides a control method for a refrigeration device, including: Once the defrosting conditions are met, the compressor 10 is kept running, and the condenser 20 is kept connected to the refrigerated evaporator 70. After the first target duration is reached, the inlet of the condenser 20 is kept disconnected from the inlet of the refrigerated evaporator 70, the inlet of the condenser 20 is kept disconnected from the inlet of the refrigerated evaporator 50, and the bypass valve 90. After the second target duration is reached, the bypass valve 90 is opened.

[0060] like Figure 2 As shown, in this embodiment, the control method for the refrigeration equipment includes steps 101, 102, and 103.

[0061] Step 101: Once the defrosting conditions are met, control the compressor 10 to continue operating and control the condenser 20 to remain connected to the refrigerated evaporator 70.

[0062] When the defrosting conditions are met, the refrigeration equipment enters the first defrosting preparation stage. In this stage, the outlet of the compressor 10 is connected to the inlet of the condenser 20. The outlet of the condenser 20 can be selectively connected to the refrigeration branch or the cold storage branch through the three-way valve 40. The first valve port 40a of the three-way valve 40 is connected to the outlet of the condenser 20, the second valve port 40b of the three-way valve 40 is connected to the cold storage branch, and the third valve port 40c of the three-way valve 40 is connected to the refrigeration branch. By switching the three-way valve 40, the connection relationship between the condenser 20, the refrigeration branch and the cold storage branch can be controlled.

[0063] Step 102: After the first target duration is reached, keep the inlet of the condenser 20 disconnected from the inlet of the refrigeration evaporator 70, the inlet of the condenser 20 disconnected from the inlet of the freezer evaporator 50, and the bypass valve 90.

[0064] After the duration of the first defrosting preparation stage reaches the first target duration, the refrigeration equipment enters the second defrosting preparation stage. In this stage, both the three-way valve 40 and the bypass valve 90 are closed, the outlet of the condenser 20 is disconnected from the inlet of the refrigeration evaporator 70, the outlet of the condenser 20 is disconnected from the inlet of the freezing evaporator 50, and the outlet of the compressor 10 is also disconnected from the inlet of the freezing evaporator 50.

[0065] Step 103: After the second target duration is reached, control the bypass valve 90 to open.

[0066] After the duration of the second defrosting preparation stage reaches the second target duration, the refrigeration equipment enters the defrosting stage. During this stage, the three-way valve 40 is closed, the bypass valve 90 is open, the outlet of the condenser 20 is disconnected from the inlet of the refrigeration evaporator 70, the outlet of the condenser 20 is disconnected from the inlet of the freezing evaporator 50, and the outlet of the compressor 10 is connected to the inlet of the freezing evaporator 50.

[0067] In some embodiments, when the refrigeration system 1 includes a three-way valve 40, when defrosting conditions are met, controlling the compressor 10 to continue operating and controlling the condenser 20 to remain in communication with the refrigerated evaporator 70 includes: The compressor 10 is controlled to operate, and the first valve port 40a of the three-way valve 40 is connected to the second valve port 40b of the three-way valve 40.

[0068] In this embodiment, the first valve port 40a of the three-way valve 40 is connected to the outlet of the condenser 20, the second valve port 40b of the three-way valve 40 is connected to the refrigeration branch, and the third valve port 40c of the three-way valve 40 is connected to the freezing branch. By controlling the first valve port 40a and the second valve port 40b of the three-way valve 40 to be connected during the first defrosting preparation stage, the outlet of the condenser 20 can be connected to the inlet of the refrigeration branch.

[0069] In some embodiments, when the refrigeration system 1 includes a three-way valve 40, after a first target duration is reached, controlling the disconnection between the inlet of the condenser 20 and the inlet of the refrigeration evaporator 70, between the inlet of the condenser 20 and the inlet of the freezing evaporator 50, and the bypass valve 90 includes: After the condenser 20 and the refrigerated evaporator 70 have been connected for the first target duration, the first valve port 40a of the three-way valve 40 is disconnected from the second valve port 40b of the three-way valve 40, the third valve port 40c of the three-way valve 40 is disconnected from the second valve port 40b of the three-way valve 40, and the bypass valve 90 remains disconnected.

[0070] In this embodiment, the first valve port 40a of the three-way valve 40 is connected to the outlet of the condenser 20, the second valve port 40b of the three-way valve 40 is connected to the refrigeration branch, and the third valve port 40c of the three-way valve 40 is connected to the freezing branch. During the second defrosting preparation stage, controlling the first valve port 40a and the second valve port 40b of the three-way valve 40 to be disconnected, and controlling the third valve port 40c of the three-way valve 40 to be disconnected from the second valve port 40b, can prevent the outlet of the condenser 20 from being connected to the inlet of the refrigeration branch, and also prevent the outlet of the condenser 20 from being connected to the inlet of the freezing branch.

[0071] Keeping the bypass valve 90 open can prevent communication between the outlet of the compressor 10 and the inlet of the refrigeration evaporator 50.

[0072] In some embodiments, after the second target duration is reached, controlling the bypass valve 90 to open includes: After the second target duration is reached between the inlet of condenser 20 and the inlet of refrigerated evaporator 70, between the inlet of condenser 20 and the inlet of refrigerated evaporator 50, and after the bypass valve 90 remains closed, the on / off solenoid valve is opened.

[0073] In this embodiment, the first valve port 40a of the three-way valve 40 is connected to the outlet of the condenser 20, the second valve port 40b of the three-way valve 40 is connected to the refrigeration branch, and the third valve port 40c of the three-way valve 40 is connected to the freezing branch. During the defrosting stage, the inlet of the condenser 20 is kept disconnected from the inlet of the refrigeration evaporator 70, the inlet of the condenser 20 is kept disconnected from the inlet of the freezing evaporator 50, and the bypass valve 90. This can prevent the outlet of the condenser 20 from being connected to the inlet of the refrigeration branch, prevent the outlet of the condenser 20 from being connected to the inlet of the freezing branch, and connect the outlet of the compressor 10 to the inlet of the freezing evaporator 50.

[0074] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0075] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0076] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0077] In the description of this application, "multiple" means two or more.

[0078] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0079] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0080] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0081] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A refrigeration device, characterized in that, include: A controller and a refrigeration system, the refrigeration system comprising: compressor; A condenser, the inlet of which is connected to the outlet of the compressor; A refrigeration branch circuit, wherein the inlet of the refrigeration evaporator in the refrigeration branch circuit is connected to the outlet of the condenser, and the outlet of the refrigeration evaporator is connected to the inlet of the compressor; A refrigerated branch circuit, wherein the inlet of the refrigerated evaporator in the refrigerated branch circuit is connected to the outlet of the condenser, and the outlet of the refrigerated evaporator is connected to the inlet of the refrigerated evaporator; A bypass valve is connected between the outlet of the compressor and the inlet of the refrigeration evaporator; The controller is configured to, when defrosting conditions are met, control the compressor to continue operating, and control the condenser and the refrigeration evaporator to remain connected for a first target duration, then control the inlet of the condenser and the inlet of the refrigeration evaporator, the inlet of the condenser and the inlet of the freezing evaporator, and the bypass valve to remain disconnected for a second target duration, and then control the bypass valve to open, so that the compressor and the freezing evaporator are connected through the bypass valve.

2. The refrigeration equipment according to claim 1, characterized in that, The refrigeration branch also includes a refrigeration capillary tube, the inlet of which is connected to the outlet of the condenser, the outlet of which is connected to the inlet of the refrigeration evaporator, and the outlet of the refrigeration evaporator is connected between the refrigeration capillary tube and the refrigeration evaporator. The refrigeration branch also includes a refrigeration capillary tube, the inlet of which is connected to the outlet of the condenser, and the outlet of which is connected to the inlet of the refrigeration evaporator.

3. The refrigeration equipment according to claim 1, characterized in that, The refrigeration system further includes: a three-way valve, wherein the first valve port of the three-way valve is connected to the outlet of the condenser, the second valve port of the three-way valve is connected to the refrigeration branch, and the third valve port of the three-way valve is connected to the freezing branch, and the three-way valve is configured such that at least one of the second valve port and the third valve port can be selectively connected to the first valve port.

4. The refrigeration equipment according to claim 3, characterized in that, The refrigeration system further includes a dryer filter connected between the condenser and the first port of the three-way valve.

5. The refrigeration equipment according to any one of claims 1-4, characterized in that, The refrigeration system further includes a refrigeration fan and a condenser fan, both of which are configured to be selectively turned on in defrost mode.

6. The refrigeration equipment according to any one of claims 1-4, characterized in that, The controller is configured to determine the first target duration and the second target duration based on the compressor's operating information and the refrigerant charge of the refrigeration system.

7. A control method applied to a refrigeration device as described in any one of claims 1-6, characterized in that, include: Once the defrosting conditions are met, the compressor is kept running, and the condenser and the refrigeration evaporator are kept in contact. After the first target duration is reached, the outlet of the condenser and the inlet of the refrigeration evaporator, the outlet of the condenser and the inlet of the freezing evaporator, and the bypass valve are kept disconnected. After the second target duration is reached, the bypass valve is opened.

8. The control method according to claim 7, characterized in that, In the case where the refrigeration system includes a three-way valve, controlling the compressor to continue operating and controlling the condenser to remain connected to the refrigeration evaporator when defrosting conditions are met includes: Control the operation of the compressor and connect the first valve port of the three-way valve to the second valve port of the three-way valve.

9. The control method according to claim 7, characterized in that, In the case where the refrigeration system includes a three-way valve, the step of keeping the connection between the inlet of the condenser and the inlet of the refrigeration evaporator, the connection between the inlet of the condenser and the inlet of the freezing evaporator, and the bypass valve disconnected after the first target duration is reached includes: After the condenser and the refrigerated evaporator have been connected for the first target duration, the first valve port of the three-way valve is disconnected from the second valve port, the third valve port of the three-way valve is disconnected from the second valve port, and the bypass valve remains disconnected.

10. The control method according to claim 7, characterized in that, The step of controlling the bypass valve to open after the second target duration is reached includes: After the time between the inlet of the condenser and the inlet of the refrigeration evaporator, between the inlet of the condenser and the inlet of the freezing evaporator, and after the bypass valve remains closed for the second target duration, the on / off solenoid valve is opened.

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