Refrigerating device, control method, controller and storage medium

Abstract

The invention relates to the field of refrigerating devices, in particular to a refrigerating device, a control method, a controller and a storage medium. The refrigeration equipment comprises a condenser; a first evaporator; a second evaporator; the valve assembly comprises a first input pipeline, a second input pipeline and an output pipeline, the first input pipeline is connected to the first branch, and the second input pipeline is connected to the second branch; the double-suction compressor comprises a first suction port, a second suction port and an exhaust port; the controller is used for opening the second input pipeline and closing the first input pipeline under the condition that the first evaporator has the cooling capacity requirement and the second evaporator does not have the cooling capacity requirement; and the controller is further used for opening the first input pipeline and closing the second input pipeline under the condition that the second evaporator has the cooling capacity requirement and the first evaporator does not have the cooling capacity requirement. According to the embodiment of the invention, the structure of the refrigerating device can be simplified and the cost of the refrigerating device can be reduced while the refrigerating capacity of different chambers can be independently controlled.

Description

Technical Field

[0001] The present application relates to the field of refrigeration devices, and in particular to a refrigeration device, a control method, a controller and a storage medium. Background Art

[0002] A refrigerator is a refrigeration device that maintains a constant low temperature. It is a common appliance used to preserve food or other items at low temperatures in daily life and is widely used in daily life and industry. Existing refrigerators only use gas-liquid separators to distribute the cooling capacity by separating the gas and liquid of the refrigerant. The above method has many uncertainties and is difficult to match the system. In addition, when the cooling capacity of the freezer and refrigerator compartments changes randomly, the refrigeration system is prone to collapse.

[0003] In order to solve the above problems, refrigerators in related technologies need to install an electric valve on the freezing and refrigeration flow paths respectively, and the electric valve is a two-way electric valve. Through the refrigerant 1 in 2 out method, it can realize the control states of refrigeration on, freezing on, refrigeration and freezing on at the same time, and refrigeration and freezing off at the same time. However, for more complex refrigeration systems, multiple electric valves are often required to control freezing and refrigeration, which leads to an increase in refrigeration costs, reduces the energy efficiency of the refrigeration device, and has the risk of liquid hammer and condensation. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a refrigeration device, a control method, a controller and a storage medium, which can simplify the structure of the refrigeration device and reduce the cost of the refrigeration device while realizing independent control of the cooling capacity of different compartments.

[0005] In a first aspect, an embodiment of the present application provides a refrigeration device, comprising:

[0006] Condenser;

[0007] a first evaporator, wherein the outlet of the condenser is connected to the inlet of the first evaporator via a first branch;

[0008] a second evaporator, wherein the outlet of the condenser is connected to the inlet of the second evaporator via a second branch;

[0009] A valve assembly, comprising a first input pipeline, a second input pipeline and an output pipeline, wherein the first input pipeline is connected to the first branch, and the second input pipeline is connected to the second branch;

[0010] A double suction compressor, comprising a first suction port, a second suction port and an exhaust port, wherein the exhaust port is connected to the inlet of the condenser, the outlet of the second evaporator and the outlet of the output pipeline are both connected to the first suction port, and the second suction port is connected to the outlet of the first evaporator;

[0011] The controller is used to open the second input pipeline and close the first input pipeline when the first evaporator has a cooling demand and the second evaporator has no cooling demand; and is also used to open the first input pipeline and close the second input pipeline when the second evaporator has a cooling demand and the first evaporator has no cooling demand.

[0012] The technical solution of the first aspect of the present application has at least one of the following advantages or beneficial effects: the refrigeration device includes a valve assembly and a double-suction compressor, the first input pipeline is connected to the first branch, and the second input pipeline is connected to the second branch, so as to realize independent control of the first input pipeline and the second input pipeline through a valve assembly, thereby further controlling the cooling amount flowing through the first branch and the second branch, the outlet of the condenser is connected to the inlet of the first evaporator through the first branch, and is connected to the inlet of the second evaporator through the second branch, wherein the outlet of the second evaporator and the outlet of the output pipeline are both connected to the first suction port, and the second suction port It is connected to the outlet of the first evaporator, so that the purpose of adjusting the cooling capacity of the first evaporator and the second evaporator can be achieved through a valve assembly, thereby realizing flexible distribution of cooling capacity and reducing costs. In addition, the controller is used to open the second input pipeline and close the first input pipeline when the first evaporator has a cooling demand and the second evaporator has no cooling demand, and is also used to open the first input pipeline and close the second input pipeline when the second evaporator has a cooling demand and the first evaporator has no cooling demand, thereby meeting the cooling demand of different evaporators, realizing separate control of different steam cooling capacities, and improving the energy efficiency of the refrigeration device.

[0013] According to some embodiments of the present application, a gas-liquid separator is further included, which includes an input port, a gas output port and a liquid output port, the input port is connected to the outlet of the condenser, the gas output port is connected to the inlet of the first branch, and the liquid output port is connected to the inlet of the second branch.

[0014] According to some embodiments of the present application, it further includes a first capillary tube, a second capillary tube and a third capillary tube, the first capillary tube is connected to the outlet of the output pipeline, the second capillary tube is connected to the inlet of the first evaporator, and the third capillary tube is connected to the inlet of the second evaporator.

[0015] According to some embodiments of the present application, a heat recovery module is further included, including a first heat exchange chamber, a second heat exchange chamber and a third heat exchange chamber, the inlet of the first heat exchange chamber is connected to the inlet of the first branch, the outlet of the first heat exchange chamber is connected to the first evaporator through the second capillary tube, the inlet of the second heat exchange chamber is connected to the first capillary tube, the outlet of the second heat exchange chamber is connected to the first air intake port, the inlet of the third heat exchange chamber is connected to the second branch, and the outlet of the third heat exchange chamber is connected to the second evaporator through the third capillary tube.

[0016] In a second aspect, an embodiment of the present application provides a control method for a refrigeration device, the refrigeration device comprising:

[0017] Condenser;

[0018] a first evaporator, wherein the outlet of the condenser is connected to the inlet of the first evaporator via a first branch;

[0019] a second evaporator, wherein the outlet of the condenser is connected to the inlet of the second evaporator via a second branch;

[0020] A valve assembly, comprising a first input pipeline, a second input pipeline and an output pipeline, wherein the first input pipeline is connected to the first branch, and the second input pipeline is connected to the second branch;

[0021] A double suction compressor, comprising a first suction port, a second suction port and an exhaust port, wherein the exhaust port is connected to the inlet of the condenser, the outlet of the second evaporator and the outlet of the output pipeline are both connected to the first suction port, and the second suction port is connected to the outlet of the first evaporator;

[0022] The control method comprises:

[0023] When the first evaporator has a cooling demand and the second evaporator has no cooling demand, the second input pipeline is opened and the first input pipeline is closed;

[0024] or,

[0025] When the second evaporator has a cooling demand and the first evaporator has no cooling demand, the first input pipeline is opened and the second input pipeline is closed.

[0026] According to some embodiments of the present application, the control method further includes:

[0027] When the first evaporator has a cooling demand and the second evaporator has a cooling demand, the first input pipeline and the second input pipeline are closed, and the double suction compressor is turned on.

[0028] According to some embodiments of the present application, the control method further includes:

[0029] When the first evaporator has no cooling demand and the second evaporator has no cooling demand, the first input pipeline and the second input pipeline are closed, and the double suction compressor is closed.

[0030] According to some embodiments of the present application, the control method further includes:

[0031] Starting the double suction compressor to cool the first chamber through the first evaporator and to cool the second chamber through the second evaporator;

[0032] When the first evaporator has a cooling demand and the second evaporator has no cooling demand, opening the second input pipeline and closing the first input pipeline comprises:

[0033] When the temperature of the first chamber does not drop to the first shutdown temperature and the temperature of the second chamber drops to the second shutdown temperature, controlling the valve assembly to open the second input pipeline and close the first input pipeline;

[0034] The method of opening the first input pipeline and closing the second input pipeline when the second evaporator has a cooling demand and the first evaporator has no cooling demand comprises:

[0035] When the temperature of the first chamber drops to the first shutdown temperature and the temperature of the second chamber does not drop to the second shutdown temperature, the valve assembly is controlled to open the first input pipeline and close the second input pipeline.

[0036] In a third aspect, an embodiment of the present application provides a controller comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the control method for the refrigeration device as described in the technical solution of the first aspect when running the computer program.

[0037] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of a refrigeration device using two electric valves in the related art;

[0039] Figure 2 is a schematic diagram of the structure of a refrigeration device provided in an embodiment of the present application;

[0040] Figure 3 is a flow chart of a control method for a refrigeration device provided in an embodiment of the present application;

[0041] Figure 4 is a flow chart of a control method for a refrigeration device provided by another embodiment of the present application;

[0042] Figure 5 is a flow chart of a control method for a refrigeration device provided by another embodiment of the present application;

[0043] Figure 6 is a flow chart of a control method for a refrigeration device provided by another embodiment of the present application;

[0044] Figure 7 It is an overall flow chart of the control method of the refrigeration device provided by the example of this application;

[0045] Figure 8 It is a structural schematic diagram of a controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. In addition, the characteristics, operations or features described in the specification can be combined in any appropriate manner to form various implementation methods. At the same time, the steps or actions in the method description can also be replaced or adjusted in order in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the accompanying drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a necessary sequence, unless otherwise specified that a certain sequence must be followed.

[0047] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0048] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0049] A refrigerator is a refrigeration device that maintains a constant low temperature. It is a common appliance used to preserve food or other items at low temperatures in daily life and is widely used in daily life and industry. Existing refrigerators only use gas-liquid separators to distribute the cooling capacity by separating the gas and liquid of the refrigerant. The above method has many uncertainties and is difficult to match the system. In addition, when the cooling capacity of the freezer and refrigerator compartments changes randomly, the refrigeration system is prone to collapse.

[0050] In order to solve the above problems, refrigerators in related technologies need to install an electric valve on the freezing and refrigeration flow paths respectively, and the electric valve is a two-way electric valve. Through the refrigerant 1 in 2 out method, it can realize the control states of refrigeration on, freezing on, refrigeration and freezing on at the same time, and refrigeration and freezing off at the same time. However, for more complex refrigeration systems, multiple electric valves are often required to control freezing and refrigeration, which leads to an increase in refrigeration costs, reduces the energy efficiency of the refrigeration device, and has the risk of liquid hammer and condensation.

[0051] Reference Figure 1 , Figure 1 The refrigeration device in the related art uses two electric valves, including a condenser 100, a gas-liquid separator 200, a first electric valve 310, a second electric valve 320, a first evaporator 500, a second evaporator 600, a liquid storage device 400 and a double suction compressor 700.

[0052] Among them, the outlet of the condenser 100 is connected to the inlet of the gas-liquid separator 200, the outlet of the gas-liquid separator 200 is respectively connected to the inlet of the first electric valve 310 and the inlet of the second electric valve 320, the outlet of the first electric valve 310 is connected to the inlet of the first evaporator 500, the outlet of the first evaporator 500 is connected to the second suction port of the double suction compressor 700, the outlet of the second electric valve 320 is connected to the first suction port of the double suction compressor 700 through the liquid storage tank 400, the outlet of the second electric valve 320 is connected to the inlet of the second evaporator 600, the outlet of the second evaporator 600 is connected to the first suction port of the double suction compressor 700, and the outlet of the double suction compressor 700 is connected to the inlet of the condenser 100, so as to realize the transmission of refrigerant and the cooling capacity regulation of the first evaporator 500 and the second evaporator 600.

[0053] like Figure 1 As shown, the existing refrigeration device needs to install an electric valve on the freezing and refrigeration flow paths respectively to ensure that the cooling capacity of freezing and refrigeration can be independently controlled when there is refrigerant flow in the main suction. Two electric valves and a liquid accumulator 400 are used to achieve the cooling capacity distribution of the double-suction refrigeration system, and the liquid phase refrigerant in the freezing flow path still needs to be collected by the liquid accumulator 400 and enter the main suction after being heated by the heat recovery module 800. The refrigeration system has a complex structure, low energy efficiency, and there is a risk of liquid hammer and condensation.

[0054] Based on this, an embodiment of the present application provides a refrigeration device, a control method, a controller and a storage medium. The refrigeration device includes a valve assembly 300 and a double-suction compressor 700. The first input pipeline is connected to the first branch, and the second input pipeline is connected to the second branch, so as to achieve independent control of the first input pipeline and the second input pipeline through a valve assembly 300, thereby further controlling the cold amount flowing through the first branch and the second branch. The outlet of the condenser 100 is connected to the inlet of the first evaporator 500 through the first branch, and is connected to the inlet of the second evaporator 600 through the second branch, wherein the outlet of the second evaporator 600 and the outlet of the output pipeline are both connected to the first suction port, and the second suction port is connected to the first evaporator. The outlet of the evaporator 500 is connected, so that the purpose of adjusting the cooling capacity of the first evaporator 500 and the second evaporator 600 can be achieved through a valve assembly 300, and the flexible distribution of cooling capacity is realized to reduce the cost. In addition, the controller is used to open the second input pipeline and close the first input pipeline when the first evaporator 500 has a cooling capacity demand and the second evaporator 600 has no cooling capacity demand. It is also used to open the first input pipeline and close the second input pipeline when the second evaporator 600 has a cooling capacity demand and the first evaporator 500 has no cooling capacity demand, so that the cooling capacity demand of the compartments where different evaporators are located can be met, the cooling capacity of the compartments where different evaporators are located can be controlled separately, and the energy efficiency of the refrigeration device can be improved.

[0055] The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0056] Reference Figure 2 , Figure 21 is a schematic diagram of the structure of a refrigeration device provided in an embodiment of the present application, wherein the refrigeration device comprises a condenser 100, which is used to cool a high-temperature and high-pressure refrigerant and convert it into a low-temperature and low-pressure state by exchanging heat with the surroundings; a first evaporator 500, which is used to absorb heat from the air and reduce the temperature, so as to realize the application of low-temperature or warm refrigeration in the refrigeration device, and the outlet of the condenser 100 is connected to the inlet of the first evaporator 500 through a first branch; a second evaporator 600, which is used to absorb heat from the air and reduce the temperature to achieve a freezing effect, so as to realize the application of deep freezing in the refrigeration device, and the outlet of the condenser 100 is connected to the inlet of the second evaporator 600 through a second branch; a valve assembly 300, which comprises a first input pipeline, a second input pipeline and an output pipeline, so as to realize independent regulation of the first input pipeline and the second input pipeline, and the first input The pipeline is connected to the first branch, and the second input pipeline is connected to the second branch, so as to further adjust the cooling capacity of the first branch and the second branch; the double suction compressor 700 includes a first suction port, a second suction port and an exhaust port, the exhaust port is connected to the inlet of the condenser 100, the outlet of the second evaporator 600 and the outlet of the output pipeline are both connected to the first suction port, and the second suction port is connected to the outlet of the first evaporator 500, so as to improve the energy efficiency of the refrigeration device and reduce the temperature of deep freezing; the controller is used to open the second input pipeline and close the first input pipeline when the first evaporator 500 has a cooling demand and the second evaporator 600 has no cooling demand; it is also used to open the first input pipeline and close the second input pipeline when the second evaporator 600 has a cooling demand and the first evaporator 500 has no cooling demand, so as to realize independent controllable cooling capacity of different compartments.

[0057] It should be noted that, in this embodiment, the cooling demand of the first evaporator 500 or the second evaporator 600 refers to the cooling demand of the compartment corresponding to the first evaporator 500 or the second evaporator 600, and the valve assembly 300 in this embodiment is an inverted electric valve, which inverts the traditional electric valve so that the electric valve becomes a two-inlet and one-outlet structure, thereby simplifying the structure of the entire refrigeration system and reducing the cost of the refrigeration system.

[0058] It is understandable that most compressors of refrigeration devices in the prior art use double-cylinder double-suction compressors 700 and jet reheat compressors. The cylinder diameter of the double-cylinder double-suction compressor 700 is small and there are many assembly parts, which complicates the compressor structure and increases the difficulty of assembling the compressor. The jet reheat compressor cannot solve the defrosting problem. When the refrigeration device is powered on for a long time, the refrigerator is prone to ice. It should be noted that in some embodiments of the present application, different from the double-cylinder double-suction compressor 700 and the jet reheat compressor in the prior art, the present application uses a single-cylinder double-suction compressor 700.

[0059] It is worth noting that the refrigeration device in this embodiment can be a device that circulates refrigerant by using components such as a compressor, a condenser 100, an evaporator and a throttle valve, for example, a refrigerator, a commercial freezer, etc.; and the first evaporator 500 in this embodiment is a refrigeration evaporator, the second evaporator 600 is a freezing evaporator, and the compartment temperatures corresponding to the first evaporator 500 and the second evaporator 600 can be adjusted according to the needs of the user, for example, the compartment temperature corresponding to the first evaporator 500 is about 0 degrees Celsius to 8 degrees Celsius, the compartment temperature corresponding to the second evaporator 600 is lower than minus forty degrees Celsius, etc.; or the compartment temperature corresponding to the first evaporator 500 is about 2 degrees Celsius to 8 degrees Celsius, the compartment temperature corresponding to the second evaporator 600 is lower than minus forty-five degrees Celsius, etc., and this embodiment does not make specific restrictions.

[0060] In the present embodiment, the first evaporator 500 and the second evaporator 600 are both provided with respective corresponding throttling components, which may be expansion valves, capillaries, etc. Taking the throttling components as the second capillary tube and the third capillary tube as an example, the second capillary tube is connected to the first evaporator 500, and the third capillary tube is connected to the second evaporator 600, so that the refrigerant first passes through the second capillary tube and then passes through the first evaporator 500, and the refrigerant first passes through the third capillary tube and then passes through the second evaporator 600, and the output pipeline of the valve component can be directly connected to the first suction port of the double suction compressor 700; when the second input pipeline is opened and the first input pipeline is closed, a part of the refrigerant passes through the second capillary tube and the first evaporator 500 in the first branch and enters the double suction port. At the second suction port of the compressor 700, another part of the refrigerant enters the second branch. Since the throttling of the third capillary tube limits the refrigerant from entering the second evaporator 600, the refrigerant preferentially passes through the output pipeline of the valve assembly 300 to enter the first suction port of the double suction compressor 700; similarly, when the first input pipeline is opened and the second output pipeline is closed, a part of the refrigerant passes through the third capillary tube and the second evaporator 600 in the second branch to enter the first suction port of the double suction compressor 700, and another part of the refrigerant enters the first branch. Since the throttling of the second capillary tube limits the refrigerant from entering the first evaporator 500, the refrigerant preferentially passes through the output pipeline of the valve assembly 300 to enter the first suction port of the double suction compressor 700.

[0061] In some embodiments of the present application, the refrigeration device also includes a gas-liquid separator 200, which includes an input port, a gas output port and a liquid output port. The input port is connected to the outlet of the condenser 100, the gas output port is connected to the inlet of the first branch, and the liquid output port is connected to the inlet of the second branch, thereby achieving separation of gas and liquid, ensuring that only gas passes through the condenser 100 in the refrigeration system, thereby improving the efficiency of the condenser 100, improving the refrigeration effect, and reducing liquid reflux.

[0062] It is understandable that the refrigerant may exist in gaseous and liquid forms at the same time under different working conditions. The gas-liquid separator 200 can effectively separate the gas and liquid, avoiding the liquid hammer problem caused by the liquid entering the compressor, improving the heat transfer effect of the condenser 100, and further improving the refrigeration effect of the entire refrigeration device. In addition, the gas-liquid separator 200 can reduce liquid reflux, ensure the stable operation of the refrigeration device, and reduce the adverse effects on the compressor.

[0063] It is worth noting that the double suction compressor has a second suction port at the middle stroke of the traditional compressor, and the compressor air inlet has a two-stage suction mechanism, in which the main suction (first stage suction) maintains the compression ratio of the original compressor, and the secondary suction (middle second stage suction) compression ratio is reduced; therefore, when the main suction and secondary suction are mixed, the entire compression ratio is reduced and the efficiency of the compressor is improved while the original compressor cylinder remains unchanged. At the same time, the gas-liquid separator 200 can separate the gas phase and liquid phase of the system refrigerant before throttling. The pure liquid phase refrigerant enters the evaporator, which can achieve a lower evaporation temperature, while the refrigerant with more gas phase enters the evaporator, providing a higher evaporation temperature, which matches the freezing and refrigeration temperature, and has the advantages of more energy saving and deep freezing.

[0064] In some embodiments of the present application, the refrigeration device also includes a first capillary tube, a second capillary tube and a third capillary tube. The first capillary tube is connected to the outlet of the output pipeline to regulate the fluid flowing through, to restrict the fluid and to distribute the liquid, so as to achieve the purpose of adjusting the flow rate. The second capillary tube is connected to the inlet of the first evaporator 500 to limit the flow rate and pressure of the refrigerant flowing through the first evaporator 500, and to reduce the pressure difference of the refrigerant between the first evaporator 500 and the condenser 100, so as to achieve the effect of controlling the refrigeration cycle. The third capillary tube is connected to the inlet of the second evaporator 600 to guide the refrigerant from the second evaporator 600 to flow to the double suction compressor 700, and in the process cool the refrigerant to a lower temperature to meet the needs of deep freezing.

[0065] Among them, in this embodiment, the throttling effect of the first capillary tube, the second capillary tube, and the third capillary tube on the refrigerant increases successively. Therefore, when the pressure difference between the inlet and outlet of the capillary tube is the same, the flow rate of the refrigerant in the first capillary tube, the second capillary tube, and the third capillary tube decreases successively, thereby ensuring that when the valve assembly 300 opens any input pipeline, the refrigerant passes through the bypass pipeline first, thereby achieving the purpose of cooling distribution. For example, when the second input pipeline is opened and the first input pipeline is closed, a part of the refrigerant passes through the second capillary tube and the first evaporator 500 in the first branch and enters the second suction port of the double suction compressor 700, and another part of the refrigerant enters the second branch. Since the throttling effect of the third capillary tube is greater than the throttling effect of the first capillary tube, the refrigerant is restricted from entering the second evaporator 600. Therefore, the refrigerant preferentially passes through the output pipeline of the valve assembly 300 and the first capillary tube to enter the first suction port of the double suction compressor 700. Similarly, when the first input pipeline is opened and the second output pipeline is closed, a part of the refrigerant passes through the third capillary tube and the second evaporator 600 in the second branch and enters the first suction port of the double suction compressor 700. Another part of the refrigerant enters the first branch. Since the throttling effect of the second capillary tube is greater than the throttling effect of the first capillary tube, the refrigerant is restricted from entering the first evaporator 500. Therefore, the refrigerant preferentially passes through the output pipeline of the valve assembly 300 and the first capillary tube to enter the first suction port of the double suction compressor 700.

[0066] In some embodiments of the present application, the refrigeration device also includes a heat recovery module 800, which is arranged between the first evaporator 500 and the valve assembly 300, and is also arranged between the second evaporator 600 and the valve assembly 300, and the heat recovery module 800 includes a first heat exchange chamber, a second heat exchange chamber and a third heat exchange chamber, the inlet of the first heat exchange chamber is connected to the inlet of the first branch, the outlet of the first heat exchange chamber is connected to the first evaporator 500 through a second capillary tube, the inlet of the second heat exchange chamber is connected to the first capillary tube, and the outlet of the second heat exchange chamber is connected to the first air intake port to transfer the bypass cold to the first evaporator 500, increase the cooling capacity of the first evaporator 500, and further improve the energy efficiency of the refrigeration device, the inlet of the third heat exchange chamber is connected to the second branch, and the outlet of the third heat exchange chamber is connected to the second evaporator 600 through a third capillary tube, so that the waste heat in the refrigeration cycle can be recovered and the waste heat can be used to improve energy efficiency.

[0067] It can be understood that, through the heat recovery module, the refrigerant returning to the double suction compressor 700 can use the heat previously released in the condenser 100 to increase its temperature and energy, so that the additional compression work that the double suction compressor 700 needs to provide for the refrigerant will be reduced, thereby reducing the power consumption and energy consumption of the refrigeration system, making full use of the waste heat in the refrigeration cycle, so that the double suction compressor 700 needs to do less work to increase the temperature and pressure of the refrigerant, saving energy, reducing refrigeration costs, and improving refrigeration effects.

[0068] Reference Figure 3 , Figure 3 is a flow chart of a control method for a refrigeration device provided in an embodiment of the present application, such as Figure 2 As shown, the refrigeration device includes a condenser 100; a first evaporator 500, the outlet of the condenser 100 is connected to the inlet of the first evaporator 500 through a first branch; a second evaporator 600, the outlet of the condenser 100 is connected to the inlet of the second evaporator 600 through a second branch; a valve assembly 300, including a first input pipeline, a second input pipeline and an output pipeline, the first input pipeline is connected to the first branch, and the second input pipeline is connected to the second branch; a double suction compressor 700, including a first suction port, a second suction port and an exhaust port, the exhaust port is connected to the inlet of the condenser 100, the outlet of the second evaporator 600 and the outlet of the output pipeline are both connected to the first suction port, and the second suction port is connected to the outlet of the first evaporator 500; the control method of the refrigeration device includes steps S100 and S200, specifically,

[0069] Step S100: when the first evaporator has a cooling demand and the second evaporator has no cooling demand, the second input pipeline is opened and the first input pipeline is closed.

[0070] In some embodiments, when the first evaporator has a cooling demand and the second evaporator has no cooling demand, it means that the first evaporator needs to be continuously cooled and the second evaporator needs to be stopped. The second input pipeline can be directly opened and the first input pipeline can be closed, so that the refrigerant delivered by the condenser is separated by the gas-liquid separator, and then transmitted to the heat recovery module through the gaseous output port and the first branch, and transmitted to the heat recovery module through the liquid output port and the second input pipeline, and then transmitted to the first evaporator through the first branch to realize cooling capacity regulation of the first evaporator, and transmitted to the first suction port of the double-suction compressor through the output pipeline to realize cooling capacity distribution between the first evaporator and the second evaporator, so as to independently adjust the cooling capacity requirements of different evaporators.

[0071] It should be noted that, taking the first evaporator as a refrigeration evaporator and the second evaporator as a freezing evaporator as an example, when the second input pipeline is opened and the first input pipeline is closed, the main suction of the freezing flow circuit will be bypassed by the valve assembly 300 to enter the double-suction compression main suction, and the refrigerant throttling cooling capacity is transferred to the refrigeration flow circuit through the first heat exchange chamber and the second heat exchange chamber in the heat recovery module, further increasing the cooling capacity of the first evaporator, ensuring the safety of the refrigeration device, and preventing the double-suction compressor from detecting liquid hammer. In addition, since the bypass uses the second capillary with the largest flow rate, the overall energy efficiency of the double-suction compressor is optimal at this time, further improving the overall energy efficiency of the refrigeration device.

[0072] It is worth noting that when the first evaporator has a cooling demand and the second evaporator has no cooling demand, the second suction port of the double suction compressor needs to be kept open. At this time, the first suction port can be in an open state or a closed state, and this embodiment does not impose specific restrictions.

[0073] Step S200: when the second evaporator has a cooling demand and the first evaporator has no cooling demand, the first input pipeline is opened and the second input pipeline is closed.

[0074] In some embodiments, when the second evaporator has a cooling demand and the first evaporator has no cooling demand, it means that the second evaporator needs to be continuously cooled and the first evaporator needs to be stopped. The first input pipeline can be directly opened and the second input pipeline can be closed, so that the refrigerant delivered by the condenser is separated by the gas-liquid separator, and then transmitted to the heat recovery module through the gaseous output port and the first input pipeline, and transmitted to the heat recovery module through the liquid output port and the second branch, and then transmitted to the second evaporator through the second branch to achieve cooling capacity adjustment of the second evaporator, and transmitted to the first suction port of the double-suction compressor through the output pipeline, so as to meet the different cooling capacity requirements of the first evaporator and the second evaporator at the same time, and realize the distribution of freezing and refrigeration flow through a valve assembly to reduce costs, and realize the switching and control of the refrigerant in three passes through the combination of the valve assembly and the capillary tube.

[0075] It should be noted that, taking the first evaporator as a refrigeration evaporator and the second evaporator as a freezing evaporator as an example, when the first input pipeline is opened and the second input pipeline is closed, the refrigerant flowing through the refrigeration enters the main suction through the bypass flow path, and the generated cold energy is transferred to the freezing flow path through the heat recovery module. In addition, a double-suction compressor is used to improve the energy efficiency of the refrigeration system and reduce the deep freezing temperature, and the bypass cold energy is transferred to the refrigeration evaporator through the heat recovery module to improve the energy efficiency of the refrigeration device.

[0076] It is worth noting that when the second evaporator has a cooling demand and the first evaporator has no cooling demand, the first suction port of the double suction compressor needs to be kept open. At this time, the second suction port can be in an open state or a closed state, and this embodiment does not impose specific restrictions.

[0077] Reference Figure 4 , Figure 4 It is a flow chart of a control method of a refrigeration device provided by another embodiment of the present application, and the flow chart includes but is not limited to step S300.

[0078] Step S300: When the first evaporator has a cooling demand and the second evaporator has a cooling demand, the first input pipeline and the second input pipeline are closed, and the double suction compressor is turned on.

[0079] In some embodiments, when the first evaporator has a cooling demand and the second evaporator has a cooling demand, it means that the first evaporator and the second evaporator need to be continuously cooled, and the first input pipeline and the second input pipeline need to be closed, so that the refrigerant passing through the gas-liquid separator reaches the heat recovery module through the first branch and the second branch, and reaches the first evaporator and the second evaporator through the heat recovery module, so as to realize the cooling capacity regulation of the first evaporator and the second evaporation, and by starting the double-suction compressor, a lower evaporation temperature can be achieved, and the refrigeration evaporation temperature is increased at the same time, making the refrigeration device more energy efficient.

[0080] Reference Figure 5 , Figure 5 It is a flowchart of a control method of a refrigeration device provided by another embodiment of the present application, and the flowchart includes but is not limited to step S400.

[0081] Step S400: When the first evaporator has no cooling demand and the second evaporator has no cooling demand, the first input pipeline and the second input pipeline are closed, and the double suction compressor is closed.

[0082] In some embodiments, when the first evaporator has no cooling demand and the second evaporator has no cooling demand, it means that the cooling capacity of the first evaporator and the second evaporator has reached the requirement, then the first input pipeline and the second input pipeline are closed, and the double suction compressor is closed to stop the cooling supply to the first evaporator and the second evaporator.

[0083] Reference Figure 6 , Figure 6 It is a flowchart of a control method of a refrigeration device provided in another embodiment of the present application, and the flowchart includes but is not limited to steps S500 to S700.

[0084] Step S500: starting the double suction compressor to cool the first chamber through the first evaporator and to cool the second chamber through the second evaporator;

[0085] In some embodiments, the double suction compressor is started to cool the first chamber through the first evaporator, and then cool the second chamber through the second evaporator, thereby achieving temperature regulation of the first chamber and the second chamber, and the temperature change of the first chamber or the second chamber can be independently controlled.

[0086] It should be noted that, in this embodiment, the first chamber is a refrigerating chamber, and the second chamber is a freezing chamber.

[0087] Step S600: When the temperature of the first chamber does not drop to the first shutdown temperature and the temperature of the second chamber drops to the second shutdown temperature, the valve assembly is controlled to open the second input pipeline and close the first input pipeline;

[0088] In some embodiments, when the temperature of the first chamber does not drop to the first shutdown temperature and the temperature of the second chamber drops to the second shutdown temperature, it indicates that the temperature of the first chamber is too high, and the temperature of the first chamber needs to be adjusted to reduce the chamber temperature of the first chamber. In this embodiment, the valve assembly is controlled to open the second input pipeline and close the first input pipeline to increase the cooling capacity flowing through the first evaporator, thereby adjusting the temperature of the first chamber without affecting the temperature of the second chamber, thereby achieving independent control of the temperature of the first chamber and the temperature of the second chamber.

[0089] It should be noted that the first shutdown temperature in this embodiment is set according to the refrigeration temperature of the first chamber, and the second shutdown temperature is set according to the freezing temperature of the second time. For example, the first shutdown temperature is set to 2 degrees Celsius, 3 degrees Celsius, 0 degrees Celsius, etc.; the second shutdown temperature is set to minus 40 degrees Celsius, minus 45 degrees Celsius, etc. This embodiment does not make specific restrictions.

[0090] Step S700: When the temperature of the first chamber drops to the first shutdown temperature and the temperature of the second chamber does not drop to the second shutdown temperature, the valve assembly is controlled to open the first input pipeline and close the second input pipeline.

[0091] In some embodiments, when the temperature of the first chamber drops to the first shutdown temperature and the temperature of the second chamber does not drop to the second shutdown temperature, it means that the temperature of the second chamber does not reach the requirement, the temperature of the second chamber is too high, and the temperature of the second chamber needs to be adjusted to reduce the chamber temperature of the second chamber. In this embodiment, the valve assembly is controlled to open the first input pipeline and close the second input pipeline to increase the cooling amount flowing through the second evaporator, so as to adjust the temperature of the second chamber without affecting the temperature of the first chamber, thereby improving the energy efficiency of the refrigeration device.

[0092] The control method of the refrigeration device of the present application is described in detail below by using an example.

[0093] Refrigeration equipment reference Figure 2 The architecture shown in this example is applied to a refrigerator, and the first chamber is a refrigeration chamber, and the second chamber is a deep freezer chamber. The control method specifically includes the following steps.

[0094] refer to Figure 7 , Figure 7 It is a flow chart of a control method of a refrigeration device provided by the example of this application.

[0095] Step S1: closing the valve assembly;

[0096] Step S2: starting the double suction compressor;

[0097] Step S3: Determine whether the second chamber reaches the second shutdown temperature;

[0098] Step S4: If yes, determine whether the first chamber reaches the first shutdown temperature;

[0099] Step S5: If not, determine whether the first chamber reaches the first shutdown temperature;

[0100] Step S6: If the first chamber in step S4 reaches the first shutdown temperature, the valve assembly is closed and the double suction compressor is turned off;

[0101] Step S7: If the first chamber in step S4 does not reach the first shutdown temperature, the valve assembly is controlled to open the second input pipeline and keep the double suction compressor turned on;

[0102] Step S8: If the first chamber in step S5 reaches the first shutdown temperature, the valve assembly is controlled to open the first input pipeline and keep the double suction compressor turned on;

[0103] It should be noted that if the first chamber in step S5 does not reach the first shutdown temperature, the valve assembly is closed.

[0104] By means of the control method of the refrigeration device in the present embodiment, the refrigeration capacity of refrigeration and freezing can be controlled separately. When the refrigerator is powered on, the double suction compressor is controlled to operate so that the refrigerant is heat exchanged through the evaporator of the refrigerating chamber and the evaporator of the freezing chamber respectively. The evaporator of the refrigerating chamber and the evaporator of the freezing chamber form two independent refrigeration cycles in pure parallel connection. The refrigerating chamber and the freezing chamber can be cooled by independent circulation at the same time. When the refrigeration capacity distribution of the refrigeration system meets the requirements, the valve assembly is closed, and the first input pipeline and the second input pipeline are disconnected at the same time. When the second chamber reaches the second shutdown temperature, the first chamber does not reach the second shutdown temperature. When the temperature reaches the first shutdown temperature, the second suction port of the double suction compressor is opened, and the main suction of the freezing flow path will enter the main suction of the compressor through the electric valve bypass, and the refrigerant throttling cold energy is transferred to the refrigeration flow path through the heat recovery module, further increasing the refrigeration capacity. Since the bypass adopts a capillary tube with the maximum flow rate, the overall energy efficiency of the double suction compressor is optimal at this time; when the first chamber reaches the first shutdown temperature and the second chamber does not reach the second shutdown temperature, the first suction port of the double suction compressor is opened, and the refrigerant flowing through the refrigeration enters the main suction through the bypass flow path, and the generated cold energy is transferred to the freezing flow path through the heat recovery module 800.

[0105] In order to more intuitively demonstrate the effect of the control method of this embodiment, a specific example is given below for illustration.

[0106] Example 2:

[0107] Example 2: A 500L R600a household refrigerator was used to test the cooling speed and energy consumption. The test results are as follows:

[0108] The refrigeration system in this embodiment adopts Figure 2 The system framework of the refrigeration device shown has a refrigerant of 72gR600a, an ambient temperature of 32°C, and a relative humidity of 75%.

[0109] Plan 1: Plan 1 does not include electric valves in the refrigerator system. After the original series-parallel refrigerator system runs stably, the average refrigeration temperature is 4.2℃, and the average temperature of the freezer is -33℃; the energy consumption test result is 1.05kwh / 24h.

[0110] Option 2: Reference Figure 1 The second scheme is to set an electric valve for the freezing branch and the refrigeration branch respectively. After the deep-cold operation of the double-suction system is stabilized, the average refrigeration temperature is 11°C and the average temperature of the freezer is -37°C; the energy consumption test result is 1.02kwh / 24h.

[0111] Option 3: Reference Figure 2 Plan 3 is a technical solution with only one electric valve. After the deep-freezing operation is stable, the average refrigeration temperature is 3.6℃, ​​and the average temperature of the freezer is -39.5℃; the energy consumption test result is 0.97kwh / 24h.

[0112] The results show that the double-suction system (Scheme 2) has improved both deep cooling and energy efficiency, but the original modification scheme has uneven cooling capacity distribution. When the freezing request is large, the refrigeration capacity is small and the refrigeration capacity compensation cannot be achieved. However, this embodiment (Scheme 3) uses an electric valve to achieve better cooling capacity distribution, and at the same time, the heat recovery module 800 is added to further improve the system energy efficiency.

[0113] like Figure 8 As shown, Figure 8 It is a schematic diagram of a controller provided in one embodiment of the present application.

[0114] The controller 1000 of the embodiment of the present application includes one or more processors 1001 and a memory 1002. Figure 8 In the figure, a processor 1001 and a memory 1002 are taken as an example.

[0115] The processor 1001 and the memory 1002 may be connected via a bus or other means. Figure 8 The example of connecting through bus is taken in the following.

[0116] The memory 1002, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory 1002 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 1002 may optionally include a memory 1002 remotely arranged relative to the processor 1001, and these remote memories may be connected to the controller 1000 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0117] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer-readable storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer-readable storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer-readable storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0118] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present application. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A refrigeration device, characterized in that: include: Condenser; a first evaporator, wherein the outlet of the condenser is connected to the inlet of the first evaporator via a first branch; a second evaporator, wherein the outlet of the condenser is connected to the inlet of the second evaporator via a second branch; A valve assembly, comprising a first input pipeline, a second input pipeline and an output pipeline, wherein the first input pipeline is connected to the first branch, and the second input pipeline is connected to the second branch; A double suction compressor, comprising a first suction port, a second suction port and an exhaust port, wherein the exhaust port is connected to the inlet of the condenser, the outlet of the second evaporator and the outlet of the output pipeline are both connected to the first suction port, and the second suction port is connected to the outlet of the first evaporator; The controller is used to open the second input pipeline and close the first input pipeline when the first evaporator has a cooling demand and the second evaporator has no cooling demand; and is also used to open the first input pipeline and close the second input pipeline when the second evaporator has a cooling demand and the first evaporator has no cooling demand.

2. The refrigeration device according to claim 1, characterized in that: It also includes a gas-liquid separator, which includes an input port, a gas output port and a liquid output port, the input port is connected to the outlet of the condenser, the gas output port is connected to the inlet of the first branch, and the liquid output port is connected to the inlet of the second branch.

3. The refrigeration device according to claim 1, characterized in that: It also includes a first capillary tube, a second capillary tube and a third capillary tube, wherein the first capillary tube is connected to the outlet of the output pipeline, the second capillary tube is connected to the inlet of the first evaporator, and the third capillary tube is connected to the inlet of the second evaporator.

4. The refrigeration device according to claim 3, characterized in that: It also includes a heat recovery module, which includes a first heat exchange chamber, a second heat exchange chamber and a third heat exchange chamber, the inlet of the first heat exchange chamber is connected to the inlet of the first branch, the outlet of the first heat exchange chamber is connected to the first evaporator through the second capillary tube, the inlet of the second heat exchange chamber is connected to the first capillary tube, the outlet of the second heat exchange chamber is connected to the first air intake port, the inlet of the third heat exchange chamber is connected to the second branch, and the outlet of the third heat exchange chamber is connected to the second evaporator through the third capillary tube.

5. A method for controlling a refrigeration device, characterized in that: The refrigeration device comprises: Condenser; a first evaporator, wherein the outlet of the condenser is connected to the inlet of the first evaporator via a first branch; a second evaporator, wherein the outlet of the condenser is connected to the inlet of the second evaporator via a second branch; A valve assembly, comprising a first input pipeline, a second input pipeline and an output pipeline, wherein the first input pipeline is connected to the first branch, and the second input pipeline is connected to the second branch; A double suction compressor, comprising a first suction port, a second suction port and an exhaust port, wherein the exhaust port is connected to the inlet of the condenser, the outlet of the second evaporator and the outlet of the output pipeline are both connected to the first suction port, and the second suction port is connected to the outlet of the first evaporator; The control method comprises: When the first evaporator has a cooling demand and the second evaporator has no cooling demand, the second input pipeline is opened and the first input pipeline is closed; or, When the second evaporator has a cooling demand and the first evaporator has no cooling demand, the first input pipeline is opened and the second input pipeline is closed.

6. The control method according to claim 5, characterized in that: The control method further comprises: When the first evaporator has a cooling demand and the second evaporator has a cooling demand, the first input pipeline and the second input pipeline are closed, and the double suction compressor is turned on.

7. The control method according to claim 5, characterized in that: The control method further comprises: When the first evaporator has no cooling demand and the second evaporator has no cooling demand, the first input pipeline and the second input pipeline are closed, and the double suction compressor is closed.

8. The control method according to claim 5, characterized in that: The control method further comprises: Starting the double suction compressor to cool the first chamber through the first evaporator and to cool the second chamber through the second evaporator; When the first evaporator has a cooling demand and the second evaporator has no cooling demand, opening the second input pipeline and closing the first input pipeline comprises: When the temperature of the first chamber does not drop to the first shutdown temperature and the temperature of the second chamber drops to the second shutdown temperature, controlling the valve assembly to open the second input pipeline and close the first input pipeline; The method of opening the first input pipeline and closing the second input pipeline when the second evaporator has a cooling demand and the first evaporator has no cooling demand comprises: When the temperature of the first chamber drops to the first shutdown temperature and the temperature of the second chamber does not drop to the second shutdown temperature, the valve assembly is controlled to open the first input pipeline and close the second input pipeline.

9. A controller, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the control method for a refrigeration device according to any one of claims 5 to 8 when executing the computer program.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the control method of the refrigeration device according to any one of claims 5 to 8.

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