Refrigerating system and supercooling degree control method thereof, electronic equipment and storage medium

Abstract

The invention discloses a refrigeration system and a supercooling degree control method thereof, electronic equipment and a storage medium, and relates to the technical field of refrigeration. The system comprises an air return pipeline, a compressor, a gaseous refrigerant branch provided with a flow valve and a temperature acquisition unit. One end of the air return pipeline is connected with the evaporator, and the other end of the air return pipeline is connected with the condenser; the compressor comprises an air suction port and an exhaust port; the exhaust port is connected to the four-way valve of the air return pipeline; the liquid storage device comprises a heat exchange pipe, and the heat exchange pipe comprises an air inlet and an air outlet; an air outlet of the liquid storage device is respectively connected with the air suction port and the four-way valve of the air return pipeline; one end of the gaseous refrigerant branch is connected to the gas return pipeline, and the other end of the gaseous refrigerant branch is connected to a gas inlet of the liquid storage device; the controller is electrically connected with the flow valve and the temperature acquisition unit; heat exchange is conducted between the gaseous refrigerant and the liquid refrigerant in the liquid storage tank by controlling the flow valve, the temperature of the liquid refrigerant is reduced, the supercooling degree of the liquid refrigerant is improved, and the energy efficiency of the refrigerating system is further improved.

Description

Technical Field

[0001] The present application relates to the field of refrigeration technology, and in particular to a refrigeration system and a subcooling control method thereof, an electronic device, and a storage medium. Background Art

[0002] In the refrigeration system, an appropriate increase in the subcooling of the liquid refrigerant and the suction superheat of the compressor can significantly improve the energy efficiency of the entire system. Generally, within the allowable range of the compressor intake air, the system energy efficiency can be improved by 1% to 3% for every 1°C increase in subcooling.

[0003] Currently, the industry typically achieves refrigerant subcooling by subcooling a small portion of the condenser's bottom section with high-temperature, high-pressure refrigerant. Under standard testing conditions, with outdoor inlet air at 35°C, the refrigerant's liquid outlet temperature is between 40°C and 45°C for optimal cost-performance. However, the current refrigerant subcooling is still insufficient. Improving the liquid refrigerant's subcooling and further improving system energy efficiency is a pressing technical challenge. 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 proposes a refrigeration system and a subcooling control method, electronic equipment, and storage medium thereof, which can control a flow valve on a gaseous refrigerant branch line to enable heat exchange between the gaseous refrigerant and the liquid refrigerant in a liquid storage tank, thereby reducing the temperature of the liquid refrigerant, increasing the subcooling of the liquid refrigerant, and further improving the energy efficiency of the refrigeration system.

[0005] In a first aspect, an embodiment of the present application provides a refrigeration system, comprising: an air return line, one end of the air return line being connected to the evaporator, and the other end of the air return line being connected to the condenser; The compressor comprises an air intake port and an air discharge port; the air discharge port is connected to the four-way valve of the air return line; The liquid reservoir comprises a heat exchange tube, wherein the heat exchange tube comprises an air inlet and an air outlet; the air outlet of the liquid reservoir is respectively connected to the air intake and the four-way valve of the air return line; A gaseous refrigerant branch circuit is provided with a flow valve, one end of the gaseous refrigerant branch circuit is connected to the return air pipeline, and the other end of the gaseous refrigerant branch circuit is connected to the air inlet of the liquid reservoir; a temperature collection unit for collecting the intake air temperature of the intake port, the first refrigerant temperature of the refrigerant outlet of the liquid reservoir, and the second refrigerant temperature of the refrigerant outlet of the condenser; A controller is electrically connected to the flow valve and the temperature acquisition unit; the controller is used to: when the refrigeration system operates in the refrigeration mode, obtain the suction temperature, the first refrigerant temperature and the second refrigerant temperature in real time; subtract the first refrigerant temperature from the second refrigerant temperature to obtain the supercooling degree; when the suction temperature is lower than the first temperature threshold, control the flow valve to open and control the opening degree of the flow valve according to the supercooling degree and the preset supercooling threshold information, so that the gaseous refrigerant branch is conductive, and control the amount of gaseous refrigerant entering the heat exchange tube of the liquid storage device from the return air pipe.

[0006] The refrigeration system provided by the embodiment of the first aspect of the present application has at least the following beneficial effects: when the refrigeration system operates in the refrigeration mode, the system controller first obtains in real time the suction temperature of the suction port of the compressor, the first refrigerant temperature of the refrigerant outlet of the liquid reservoir, and the second refrigerant temperature of the refrigerant outlet of the condenser collected by the temperature collection unit; the first refrigerant temperature is subtracted from the second refrigerant temperature to obtain the supercooling degree; when the suction temperature is lower than the first temperature threshold, the flow valve is controlled to open and the opening degree of the flow valve is controlled according to the supercooling degree and the preset supercooling degree threshold information, so that the gaseous refrigerant branch is conductive and the amount of gaseous refrigerant entering the heat exchange tube of the liquid reservoir from the return air pipe is controlled; liquid refrigerant is stored outside the heat exchange tube in the liquid reservoir, and the gaseous refrigerant introduced through the gaseous refrigerant branch can perform heat exchange with the liquid refrigerant in the liquid storage tank, further reducing the temperature of the liquid refrigerant in the liquid storage tank, further increasing the supercooling degree of the liquid refrigerant, thereby improving the energy efficiency of the refrigeration system. That is to say, the refrigeration system of the embodiment of the present application utilizes a gaseous refrigerant branch equipped with a flow valve, which can introduce the low-temperature and low-pressure gaseous refrigerant in the return air pipeline into the heat exchange tube of the liquid storage tank by controlling the flow valve, so that the gaseous refrigerant and the liquid refrigerant stored outside the heat exchange tube in the liquid storage tank can exchange heat, further reducing the temperature of the liquid refrigerant in the liquid storage tank and increasing the supercooling of the liquid refrigerant, thereby further improving the energy efficiency of the refrigeration system.

[0007] In a second aspect, the present application provides a method for controlling subcooling of a refrigeration system, which is applied to a controller of a refrigeration system according to any one of the embodiments of the first aspect, wherein the refrigeration system further comprises: a return air pipeline, a compressor, a liquid reservoir, a gaseous refrigerant branch provided with a flow valve, and a temperature acquisition unit; the controller is electrically connected to the flow valve and the temperature acquisition unit; wherein one end of the return air pipeline is connected to the evaporator, and the other end of the return air pipeline is connected to the condenser; one end of the gaseous refrigerant branch is connected to the return air pipeline, and the other end of the gaseous refrigerant branch is connected to the air inlet of the liquid reservoir; The method comprises: When the refrigeration system operates in a refrigeration mode, the suction temperature of the suction port of the compressor, the first refrigerant temperature of the refrigerant outlet of the liquid accumulator, and the second refrigerant temperature of the refrigerant outlet of the condenser collected by the temperature collection unit are obtained in real time; Subtracting the first refrigerant temperature from the second refrigerant temperature to obtain a degree of supercooling; When the intake temperature is lower than a first temperature threshold, the flow valve is controlled to open and the opening degree of the flow valve is controlled according to the subcooling degree and the preset subcooling threshold information so as to allow the gaseous refrigerant branch to be conducted and to control the amount of gaseous refrigerant entering the heat exchange tube of the liquid storage device from the return air duct.

[0008] According to the second aspect of the present application, the subcooling control method of the refrigeration system provided in the embodiment has at least the following beneficial effects: when the refrigeration system operates in the refrigeration mode, the controller of the refrigeration system can first obtain the suction temperature of the suction port of the compressor, the first refrigerant temperature of the refrigerant outlet of the liquid reservoir, and the second refrigerant temperature of the refrigerant outlet of the condenser collected by the temperature collection unit in real time; subtract the first refrigerant temperature from the second refrigerant temperature to obtain the subcooling; when the suction temperature is lower than the first temperature threshold, the flow valve is controlled to open and the opening of the flow valve is controlled according to the subcooling and the preset subcooling threshold information to make the gaseous refrigerant branch conductive and control the amount of gaseous refrigerant entering the heat exchange tube of the liquid reservoir from the return air pipe; liquid refrigerant is stored outside the heat exchange tube in the liquid reservoir, and the gaseous refrigerant introduced through the gaseous refrigerant branch can perform heat exchange with the liquid refrigerant in the liquid storage tank, further reducing the temperature of the liquid refrigerant in the liquid storage tank, further increasing the subcooling of the liquid refrigerant, and thus improving the energy efficiency of the refrigeration system. That is to say, the subcooling control method of the refrigeration system provided in the embodiment of the present application can introduce the low-temperature and low-pressure gaseous refrigerant in the return air pipeline into the heat exchange tube of the liquid storage tank by controlling the flow valve on the gaseous refrigerant branch, so that the gaseous refrigerant and the liquid refrigerant stored outside the heat exchange tube in the liquid storage tank can exchange heat, further reducing the temperature of the liquid refrigerant in the liquid storage tank and increasing the subcooling of the liquid refrigerant, thereby further improving the energy efficiency of the refrigeration system.

[0009] In a third aspect, an embodiment of the present application provides an electronic device, comprising a refrigeration system as described in any one of the embodiments of the first aspect, wherein the controller of the refrigeration system is capable of executing the subcooling control method of the refrigeration system as described in any one of the embodiments of the second aspect.

[0010] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the subcooling control method of a refrigeration system as described in any one of the embodiments of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic structural diagram of a refrigeration system provided by one embodiment of the present application; Figure 2 This is a schematic diagram of the specific structure of an air conditioner including a refrigeration system provided by one embodiment of the present application; Figure 3 This is a schematic diagram of the specific structure of a refrigeration and freezing device including a refrigeration system provided by one embodiment of the present application; Figure 4 This is a schematic diagram of electrical connections of a controller of a refrigeration system provided in one embodiment of the present application; Figure 5 This is a schematic diagram of the hardware structure of a controller provided by one embodiment of the present application; Figure 6 1 is a flow chart of a method for controlling subcooling of a refrigeration system provided by one embodiment of the present application; Reference numerals: Refrigeration system 100, evaporator 101, condenser 102, refrigerant outlet 1021, four-way valve 103, first end A, second end B, third end C, fourth end D, return air line 104, compressor 105, air intake 1051, exhaust 1052, liquid reservoir 106, heat exchange tube 1061, air inlet 1062, air outlet 1063, refrigerant liquid outlet 1064, controller 107, flow valve 108, gas Refrigerant branch 109, intake temperature sensor 110a, first refrigerant temperature sensor 110b, second refrigerant temperature sensor 110c; air conditioner 200, indoor blower 201, condensing blower 202, first electronic expansion valve 203, filter 204, inner ring temperature sensor 205, defrost temperature sensor 206, outer ring temperature sensor 207, refrigeration equipment 300, centrifugal fan 301, axial fan 302, second electronic expansion valve 303. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solutions and advantages of this application more clear, this application is further described in detail below with reference to the accompanying drawings and embodiments.

[0013] It should be noted that although a logical order is shown in the flowchart in the description of this application, in some cases, the steps shown or described may be performed in an order different from that in the flowchart. In the description of this application, "several" means one or more, and "more" means two or more. The description of "first" and "second" is only used to distinguish 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.

[0014] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0015] The present application provides a refrigeration system, a method for controlling the degree of subcooling of a refrigeration system, an electronic device, and a computer-readable storage medium, and relates to the field of refrigeration technology. The refrigeration system includes a return air pipeline, a compressor, a gaseous refrigerant branch provided with a flow valve, and a temperature acquisition unit; one end of the return air pipeline is connected to the evaporator, and the other end of the return air pipeline is connected to the condenser; the compressor includes an air intake and an exhaust port; the exhaust port is connected to the four-way valve of the return air pipeline; the liquid reservoir includes a heat exchange tube, and the heat exchange tube includes an air inlet and an air outlet; the air outlet of the liquid reservoir is respectively connected to the air intake and the four-way valve of the return air pipeline; one end of the gaseous refrigerant branch is connected to the return air pipeline, and the other end of the gaseous refrigerant branch is connected to the air inlet of the liquid reservoir; a controller is electrically connected to the flow valve and the temperature acquisition unit; by controlling the flow valve, the gaseous refrigerant and the liquid refrigerant in the liquid storage tank are heat exchanged, the temperature of the liquid refrigerant is reduced, the degree of subcooling of the liquid refrigerant is increased, and the energy efficiency of the refrigeration system is further improved.

[0016] The embodiments of the present application are further described below with reference to the accompanying drawings.

[0017] Combine Figure 1 and Figure 4 As shown, an embodiment of the present application provides a refrigeration system 100, which includes: an evaporator 101, a condenser 102, a return air pipeline 104 provided with a four-way valve 103, a compressor 105, a liquid storage tank 106, a gas refrigerant branch 109 provided with a flow valve 108, a temperature acquisition unit and a controller 107.

[0018] The connection relationship among the evaporator 101, the condenser 102, the return air pipeline 104, the compressor 105, the liquid storage tank 106, the gas refrigerant branch 109 provided with the flow valve 108, the temperature acquisition unit and the controller 107 in the refrigeration system 100 is further explained.

[0019] like Figure 1 and Figure 4As shown, one end of the return air pipeline 104 is connected to the evaporator 101, and the other end of the return air pipeline 104 is connected to the condenser 102; the compressor 105 includes an air intake port 1051 and an air outlet 1052; the air outlet 1052 is connected to the four-way valve 103 of the return air pipeline 104; the liquid reservoir 106 includes a heat exchange pipe 1061, and the heat exchange pipe 1061 includes an air inlet 1062 and an air outlet 1063; the air outlet 1063 of the liquid reservoir 106 is respectively connected to the air intake port 1051 and the four-way valve 106 of the return air pipeline 104. 103 connection; a gaseous refrigerant branch 109 is provided with a flow valve 108, one end of the gaseous refrigerant branch 109 is connected to the return air pipeline 104, and the other end of the gaseous refrigerant branch 109 is connected to the air inlet 1062 of the liquid reservoir 106; a temperature acquisition unit is used to collect the intake temperature of the intake port 1051, the first refrigerant temperature of the refrigerant outlet 1064 of the liquid reservoir 106, and the second refrigerant temperature of the refrigerant outlet 1021 of the condenser 102; the controller 107 is electrically connected to the flow valve 108 and the temperature acquisition unit.

[0020] According to some embodiments of the present application, Figure 1 As shown, the liquid reservoir 106 further includes a refrigerant outlet 1064, and the temperature acquisition unit includes a first refrigerant temperature sensing package 110b; the first refrigerant temperature sensing package 110b is disposed at the refrigerant outlet 1064 of the liquid reservoir 106. The first refrigerant temperature sensing package 110b is used to acquire the first refrigerant temperature at the refrigerant outlet 1064 of the liquid reservoir 106, providing reference data for subsequent subcooling control by the controller 107.

[0021] According to some embodiments of the present application, Figure 1 As shown, the temperature acquisition unit further includes an intake temperature sensor 110a, which is provided at the intake port 1051 of the compressor 105. The intake temperature sensor 110a is used to collect the intake temperature of the intake port 1051 of the compressor 105, providing reference data for the subsequent controller 107 to perform subcooling control.

[0022] According to some embodiments of the present application, Figure 1 As shown, the condenser 102 includes a refrigerant outlet 1021, and the temperature collection unit includes: a second refrigerant temperature sensor 110c; the second refrigerant temperature sensor 110c is set at the refrigerant outlet 1021 of the condenser 102. The second refrigerant temperature sensor 110c is used to collect the second refrigerant temperature of the refrigerant outlet 1021 of the condenser 102, and provide reference data for the subsequent controller 107 to perform subcooling control. When the refrigeration system is in cooling mode, the refrigerant flow direction is as follows Figure 1 As indicated by the green arrow.

[0023] It is understandable that if Figure 4As shown, the temperature acquisition unit includes: a first refrigerant temperature sensing package 110b, an air intake temperature sensing package 110a, and a second refrigerant temperature sensing package 110c; the first refrigerant temperature sensing package 110b, the air intake temperature sensing package 110a, and the second refrigerant temperature sensing package 110c are electrically connected to the controller 107. It should be noted that, in practice, the controller 107 is electrically connected to the four-way valve 103, the compressor 105 and other devices, but this application does not involve the control of the four-way valve 103, the compressor 105 and other devices. Therefore, in Figure 4 The electrical connection relationship between the controller 107 and the four-way valve 103, the compressor 105 and other devices is not reflected.

[0024] Specifically, if Figure 1 、 Figure 2 As shown, a four-way valve 103 is provided on the return air duct. A first end A of the four-way valve 103 is connected to the evaporator 101, a second end B of the four-way valve 103 is connected to the exhaust port 1052, a third end C of the four-way valve 103 is connected to the condenser 102, and a fourth end D of the four-way valve 103 is connected to the outlet 1063 of the liquid accumulator 106 and the intake port 1051 of the compressor 105. It can be understood that the reversing action of the four-way valve 103 can change the flow direction of the refrigerant in the return air duct.

[0025] It should be noted that when the refrigeration system 100 operates in cooling mode, the evaporator 101, condenser 102, compressor 105, liquid reservoir 106, temperature acquisition unit, and controller 107 are all activated. A low-temperature, low-pressure gaseous refrigerant flows from the evaporator 101 back to the compressor 105 in the return air line 104, and liquid refrigerant flows in the liquid reservoir 106. The controller 107 is configured to: when the refrigeration system 100 operates in cooling mode, obtain the suction temperature, the first refrigerant temperature, and the second refrigerant temperature in real time; subtract the first refrigerant temperature from the second refrigerant temperature to obtain the degree of subcooling; and, when the suction temperature is less than a first temperature threshold, control the flow valve 108 to open and adjust the opening of the flow valve 108 based on the degree of subcooling and a preset subcooling threshold, so as to open the gaseous refrigerant branch 109 and control the amount of gaseous refrigerant flowing from the return air line into the heat exchange pipe 1061 of the liquid reservoir 106.

[0026] like Figure 5As shown, the present application also provides a controller 107, including: a processor 501, which can be implemented in the form of a general-purpose central processing unit, a microprocessor, an application-specific integrated circuit, or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided by the embodiments of the present application; a memory 502, which can be implemented in the form of a read-only memory, a static storage device, a dynamic storage device, or a random access memory. The memory 502 can store an operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program codes are stored in the memory 502 and are called by the processor 501 to execute the subcooling control method of the refrigeration system 100 in the embodiments of the present application; the input / output interface 503 is used to implement information input and output; the communication interface 504 is used to implement communication interaction between the present device and other devices, and communication can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.); the bus 505 transmits information between the various components of the device (such as the processor 501, the memory 502, the input / output interface 503 and the communication interface 504); wherein the processor 501, the memory 502, the input / output interface 503 and the communication interface 504 are connected to each other within the device through the bus 505.

[0027] The refrigeration system 100 provided in accordance with the embodiment of the first aspect of the present application has the following beneficial effects: when the refrigeration system 100 operates in the refrigeration mode, the controller 107 of the refrigeration system 100 first obtains in real time the suction temperature of the suction port 1051 of the compressor 105, the first refrigerant temperature of the refrigerant outlet 1064 of the liquid storage device 106, and the second refrigerant temperature of the refrigerant outlet 1021 of the condenser 102 collected by the temperature collection unit; the second refrigerant temperature is subtracted from the first refrigerant temperature to obtain the degree of supercooling; when the suction temperature is less than the first temperature threshold, the degree of supercooling is obtained according to the degree of supercooling. The flow valve 108 is controlled to open and the opening degree of the flow valve 108 is controlled according to the preset supercooling threshold information, so that the gaseous refrigerant branch 109 is conductive, and the amount of gaseous refrigerant entering the heat exchange tube 1061 of the liquid storage tank 106 from the return air pipe is controlled; and liquid refrigerant is stored outside the heat exchange tube 1061 in the liquid storage tank 106, and the gaseous refrigerant introduced through the gaseous refrigerant branch 109 can exchange heat with the liquid refrigerant in the liquid storage tank, further reducing the temperature of the liquid refrigerant in the liquid storage tank, and further increasing the supercooling degree of the liquid refrigerant, thereby improving the energy efficiency of the refrigeration system 100. That is to say, the refrigeration system 100 of the embodiment of the present application utilizes a gaseous refrigerant branch 109 provided with a flow valve 108, and can introduce the low-temperature and low-pressure gaseous refrigerant in the return air pipeline 104 into the heat exchange tube 1061 of the liquid storage tank 106 by controlling the flow valve 108, so that the gaseous refrigerant and the liquid refrigerant stored in the liquid storage tank outside the heat exchange tube 1061 can exchange heat, further reduce the temperature of the liquid refrigerant in the liquid storage tank, and increase the supercooling of the liquid refrigerant, thereby further improving the energy efficiency of the refrigeration system 100.

[0028] It should be emphasized that the refrigeration system 100 of the present application is to branch a gaseous refrigerant branch 109 from the return air line 104 of the evaporator 101 to the liquid storage tank, and transport the low-temperature, low-pressure gaseous refrigerant in the return air line 104 to the heat exchange pipe 1061 of the liquid storage tank for heat exchange with the high-temperature, high-pressure liquid refrigerant, and then return it to the suction pipe of the compressor 105 to increase the subcooling of the liquid refrigerant. The flow valve 108 on the gaseous refrigerant branch 109 is mainly controlled by the suction temperature of the suction port 1051 of the compressor 105 and the calculated subcooling, and the amount of low-temperature, low-pressure gaseous refrigerant entering the liquid storage tank is adjusted to achieve the high-pressure, low-temperature liquid refrigerant with a higher subcooling required by the design, thereby improving the energy efficiency of the entire refrigeration system 100 by 5% to 10%.

[0029] This embodiment of the present application provides an electronic device including a refrigeration system 100 as described in any of the embodiments of the present application; a controller 107 of the refrigeration system 100 is capable of executing a subcooling control method for the refrigeration system 100 as described in any of the subsequent embodiments of the present application. It should be noted that the refrigeration system 100 of the present application is applicable to a cooling-only system. Specifically, the electronic device includes, but is not limited to, an air conditioner 200 and a refrigeration and freezing device 300.

[0030] Specifically, if Figure 2 As shown, an air conditioner 200 provided in an embodiment of the present application includes: Figure 1 The refrigeration system 100 shown in FIG. 1 includes: Figure 1 As shown: evaporator 101, condenser 102, return air line 104, compressor 105, liquid reservoir 106, gaseous refrigerant branch 109 provided with flow valve 108, temperature acquisition unit and controller 107. In addition, air conditioner 200 also includes but is not limited to: indoor air blower 201, condensing fan 202, first electronic expansion valve 203, multiple filters 204; inner ring temperature sensing package 205 and defrost temperature sensing package 206 provided on evaporator 101, outer ring temperature sensing package 207 provided on condenser 102; the specific connection relationship between each structure and component of refrigeration system 100 in air conditioner 200 is shown as follows: Figure 2 When the air conditioner 200 is in cooling mode, the refrigerant flows as indicated by the green arrows; when the air conditioner 200 is in defrosting mode, the refrigerant flows as indicated by the red arrows. Since the other internal structures of the air conditioner 200, as well as the connection relationships and operating principles between the various structures, are well known to those skilled in the art, the embodiments of this application will not be described in detail here. The air conditioner 200 includes the refrigeration system 100 provided in this application, which can increase the supercooling degree of the liquid refrigerant, thereby further improving the energy efficiency of the refrigeration system 100 of the air conditioner 200.

[0031] Specifically, if Figure 3 As shown, a refrigeration device 300 provided in an embodiment of the present application includes: Figure 1 The refrigeration system 100 shown in FIG. 1 includes: Figure 1 As shown: evaporator 101, condenser 102, return air line 104, compressor 105, liquid reservoir 106, gaseous refrigerant branch 109 with flow valve 108, temperature acquisition unit and controller 107. In addition, the refrigeration equipment 300 also includes but is not limited to: centrifugal fan 301, axial fan 302, second electronic expansion valve 303, and multiple temperature sensors. The specific connection relationship between the various structures and components of the refrigeration system 100 in the refrigeration equipment 300 is as follows: Figure 3 As shown. Since the other internal structures of the refrigeration and freezing equipment 300, as well as the connection relationships between the various structures and the operating principles are well known to those skilled in the art, the embodiments of the present application will not be described in detail here. The refrigeration and freezing equipment 300 includes the refrigeration system 100 provided in this application, which can increase the supercooling degree of the liquid refrigerant, thereby further improving the energy efficiency of the refrigeration system 100 in the refrigeration and freezing equipment 300.

[0032] In summary, the electronic equipment (air conditioner 200, refrigeration equipment 300) provided in the embodiments of the present application has the following beneficial effects: the electronic equipment uses a gaseous refrigerant branch 109 provided with a flow valve 108, and can introduce the low-temperature and low-pressure gaseous refrigerant in the return air pipeline 104 into the heat exchange tube 1061 of the liquid storage tank 106 by controlling the flow valve 108, so that the gaseous refrigerant and the liquid refrigerant stored in the liquid storage tank outside the heat exchange tube 1061 are heat exchanged, further reducing the temperature of the liquid refrigerant in the liquid storage tank, and increasing the supercooling of the liquid refrigerant, thereby further improving the energy efficiency of the refrigeration system 100.

[0033] Those skilled in the art will understand that the system structure shown in the figure does not constitute a limitation on the embodiments of the present application, and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0034] Those skilled in the art will understand that the system architecture and application scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Those skilled in the art will know that with the evolution of the system architecture and the emergence of new application scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0035] Based on the above system structure, various embodiments of the subcooling control method of the refrigeration system of the present application are proposed below.

[0036] First, as Figure 6 As shown, the subcooling control method of the refrigeration system can be applied to Figure 1 The controller of the refrigeration system shown in FIG. 1 further includes: a return air line, a compressor, a liquid accumulator, a gaseous refrigerant branch equipped with a flow valve, and a temperature acquisition unit; the controller is electrically connected to the flow valve and the temperature acquisition unit; one end of the return air line is connected to the evaporator, and the other end of the return air line is connected to the condenser; one end of the gaseous refrigerant branch is connected to the return air line, and the other end of the gaseous refrigerant branch is connected to the air inlet of the liquid accumulator. The subcooling control method of the refrigeration system may include, but is not limited to, steps S110 to S130.

[0037] Step S110: When the refrigeration system operates in the cooling mode, the suction temperature of the compressor suction port, the first refrigerant temperature of the refrigerant outlet of the liquid accumulator, and the second refrigerant temperature of the refrigerant outlet of the condenser are acquired in real time by the temperature acquisition unit.

[0038] Step S120: subtracting the first refrigerant temperature from the second refrigerant temperature to obtain the degree of subcooling.

[0039] Step S130: When the intake temperature is lower than the first temperature threshold, the flow valve is controlled to open and the opening degree of the flow valve is controlled according to the supercooling degree and the preset supercooling threshold information to make the gaseous refrigerant branch conductive and control the amount of gaseous refrigerant entering the heat exchange pipe of the liquid storage tank from the return air duct.

[0040] Specifically, in step S110, the temperature acquisition unit includes: a first refrigerant temperature sensing package, an intake air temperature sensing package, and a second refrigerant temperature sensing package; the first refrigerant temperature sensing package, the intake air temperature sensing package, and the second refrigerant temperature sensing package are electrically connected to the controller respectively.

[0041] Specifically, step S110 includes: when the refrigeration system operates in the refrigeration mode, obtaining the suction temperature of the suction port of the compressor collected by the suction temperature sensor, obtaining the first refrigerant temperature of the refrigerant outlet of the liquid storage device collected by the first refrigerant temperature sensor, and obtaining the second refrigerant temperature of the refrigerant outlet of the condenser collected by the second refrigerant temperature sensor; providing reference data for the subsequent controller to perform supercooling control.

[0042] Specifically, the subcooling degree is calculated by subtracting the first refrigerant temperature from the second refrigerant temperature in step S120, so as to jointly control the flow valve based on the suction temperature and the subcooling degree. The subcooling degree essentially refers to the temperature difference between the second refrigerant temperature and the first refrigerant temperature.

[0043] Specifically, in step S130, the first temperature threshold is 15 degrees Celsius.

[0044] Specifically, in step S130, the preset supercooling threshold information includes: a first supercooling threshold and a second supercooling threshold greater than the first supercooling threshold. In one embodiment, the first supercooling threshold is 13 degrees Celsius and the second supercooling threshold is 15 degrees Celsius.

[0045] Through step S130, according to the energy efficiency requirements of the refrigeration system, the amount of gaseous refrigerant entering the liquid reservoir is adjusted by controlling the opening of the flow valve, thereby exchanging heat with the high-temperature and high-pressure refrigerant in the liquid reservoir to achieve liquid outlet temperature control of the liquid reservoir.

[0046] It should be noted that the flow valve is jointly controlled based on the suction temperature and the subcooling in step S130, and the suction temperature is used mainly to prevent potential risks such as excessive suction superheat of the compressor, which increases energy consumption, and excessive exhaust temperature.

[0047] The subcooling control method of the refrigeration system provided in the embodiment of the present application has the following beneficial effects: when the refrigeration system operates in the refrigeration mode, the controller of the refrigeration system can first obtain the suction temperature of the suction port of the compressor, the first refrigerant temperature of the refrigerant outlet of the liquid reservoir, and the second refrigerant temperature of the refrigerant outlet of the condenser collected by the temperature collection unit in real time; the subcooling is obtained by subtracting the first refrigerant temperature from the second refrigerant temperature; when the suction temperature is lower than the first temperature threshold, the flow valve is controlled to open and the opening of the flow valve is controlled according to the subcooling and preset subcooling threshold information to make the gaseous refrigerant branch conductive and control the amount of gaseous refrigerant entering the heat exchange tube of the liquid reservoir from the return air pipe; liquid refrigerant is stored outside the heat exchange tube in the liquid reservoir, and the gaseous refrigerant introduced through the gaseous refrigerant branch can perform heat exchange with the liquid refrigerant in the liquid storage tank, further reducing the temperature of the liquid refrigerant in the liquid storage tank, further increasing the subcooling of the liquid refrigerant, and thus improving the energy efficiency of the refrigeration system. That is to say, the subcooling control method of the refrigeration system provided in the embodiment of the present application can introduce the low-temperature and low-pressure gaseous refrigerant in the return air pipeline into the heat exchange tube of the liquid storage tank by controlling the flow valve on the gaseous refrigerant branch, so that the gaseous refrigerant and the liquid refrigerant stored outside the heat exchange tube in the liquid storage tank can exchange heat, further reducing the temperature of the liquid refrigerant in the liquid storage tank and increasing the subcooling of the liquid refrigerant, thereby further improving the energy efficiency of the refrigeration system.

[0048] It's important to emphasize that this embodiment utilizes a flow valve on the additional gaseous refrigerant branch to direct the low-pressure, low-temperature gaseous refrigerant returning from the evaporator to the compressor toward the heat exchange tube in the reservoir, further lowering the temperature of the liquid refrigerant in the reservoir and thereby increasing the subcooling of the liquid refrigerant. By controlling the flow valve, the subcooling of the liquid refrigerant in the reservoir can be increased by 5-10°C, improving the refrigeration system's energy efficiency by 5-10%.

[0049] According to some embodiments of the present application, the preset supercooling threshold information includes: a first supercooling threshold; further illustrating step S130, wherein the flow valve is controlled to open and the opening of the flow valve is controlled according to the supercooling and the preset supercooling threshold information to make the gaseous refrigerant branch conductive, and to control the amount of gaseous refrigerant in the heat exchange tube entering the liquid storage tank from the return air pipe, including but not limited to steps S131 to S132.

[0050] Step S131: When the degree of subcooling is less than the first subcooling threshold, the flow valve is controlled to open to allow the gaseous refrigerant branch to be conducted.

[0051] Step S132: After the flow valve is controlled to open, the opening of the flow valve is controlled to increase according to a first preset rate.

[0052] Specifically, the first preset rate is 50 steps / minute.

[0053] An example is provided to illustrate steps S131 to S132. Example 1: When the degree of subcooling is less than a first subcooling threshold (13 degrees Celsius), the flow valve is controlled to open, allowing the gaseous refrigerant branch to flow into the heat exchange tube of the accumulator. After the flow valve is opened, the flow valve opening is simultaneously controlled to increase at a first preset rate (50 steps / minute), thereby increasing the amount of gaseous refrigerant entering the heat exchange tube of the accumulator from the return air pipe.

[0054] Through steps S131 to S132, when the intake temperature is lower than the first temperature threshold and when the degree of supercooling is lower than the first degree of supercooling threshold, the opening of the flow valve is controlled to increase, so that the amount of gaseous refrigerant entering the heat exchange tube of the liquid storage tank increases, and heat exchange is performed with the liquid refrigerant stored outside the heat exchange tube, thereby further reducing the temperature of the liquid refrigerant in the liquid storage tank and increasing the degree of supercooling of the liquid refrigerant, thereby further improving the energy efficiency of the refrigeration system.

[0055] According to some embodiments of the present application, the preset supercooling threshold information also includes: a second supercooling threshold that is greater than the first supercooling threshold; wherein, the flow valve is controlled to open and the opening of the flow valve is controlled according to the supercooling and the preset supercooling threshold information to make the gaseous refrigerant branch conductive and control the amount of gaseous refrigerant in the heat exchange tube entering the liquid storage tank from the return air pipe, including but not limited to steps S133 to S134.

[0056] Step S133: When the degree of supercooling is greater than or equal to the first supercooling threshold and less than the second supercooling threshold, the flow valve is kept open, and the opening of the flow valve is controlled to continue to increase according to a second preset rate; wherein the second preset rate is less than the first preset rate.

[0057] Step S134: When the subcooling degree is equal to the second subcooling degree threshold, the flow valve is controlled to maintain the current opening degree.

[0058] Specifically, in step S133, the second supercooling threshold is 15 degrees Celsius. The second preset rate is 20 steps / minute.

[0059] Take an example to illustrate step S133. Example 2: When the degree of supercooling is greater than or equal to the first supercooling threshold (13 degrees Celsius) and less than the second supercooling threshold (15 degrees Celsius), keep the flow valve open, reduce the rate of change of the opening to the second preset rate (20 steps / minute), and control the opening of the flow valve to continue to increase at the second preset rate (20 steps / minute). Increase the heat exchange between the low-temperature, low-pressure gaseous refrigerant and the high-temperature, high-pressure liquid refrigerant in the liquid storage economizer to achieve an increase in supercooling. The principle of increasing supercooling is that the refrigerant gas coming out of the evaporator is low-temperature, low-pressure, and absorbs the heat of the high-temperature, high-pressure liquid refrigerant through the heat exchange tube in the liquid storage tank, thereby reducing the temperature of the high-temperature, high-pressure liquid refrigerant.

[0060] Step S134 is described as follows: Example 3: When the subcooling degree changes to the second subcooling degree threshold (15 degrees Celsius), the flow valve is controlled not to operate and remains at the current opening, so as to maintain the subcooling degree at a good target value (15 degrees Celsius).

[0061] The embodiment of the present application implements a flow valve opening adjustment mechanism based on subcooling through steps S131 to S134 when the intake temperature is lower than the first temperature threshold; this is beneficial for introducing the low-temperature and low-pressure gaseous refrigerant in the return air line into the liquid reservoir, where the low-temperature and low-pressure gaseous refrigerant in the liquid reservoir performs heat exchange with the high-temperature and high-pressure liquid refrigerant, thereby increasing the subcooling of the liquid refrigerant and improving the energy efficiency of the refrigeration system.

[0062] According to some embodiments of the present application, the subcooling control method of the refrigeration system in the embodiments of the present application further includes but is not limited to steps S210 to S220.

[0063] Step S210: When the intake air temperature is greater than or equal to a first temperature threshold and less than a second temperature threshold, the opening of the flow valve is controlled to decrease according to a first preset rate; wherein the second temperature threshold is greater than the first temperature threshold.

[0064] Step S220: When the intake air temperature is greater than or equal to the second temperature threshold, the flow valve is closed.

[0065] Specifically, the first temperature threshold is 15 degrees Celsius, and the second temperature threshold is 18 degrees Celsius. It should be noted that when the outdoor temperature is high (greater than 54 degrees Celsius), the condensing effect of the condenser will deteriorate. At this time, the outlet temperature of the condenser will be relatively high. At this time, the low-temperature gaseous refrigerant in the liquid reservoir will absorb a large amount of heat, causing the temperature of the gaseous refrigerant returning to the compressor to rise sharply, that is, the suction temperature will rise. Therefore, in order to protect the normal use and service life of the compressor, it is recommended that the suction temperature of the compressor does not exceed 18 degrees Celsius. At this time, the opening of the flow valve should be reduced. Therefore, this application sets the second temperature threshold to 18 degrees Celsius. When the suction temperature is greater than or equal to 18 degrees Celsius, the flow valve is closed, and the flow valve opening is 0.

[0066] Through steps S210 to S220, a priority control mechanism based on the suction temperature of the compressor is implemented, which can achieve supercooling adjustment while ensuring the safe operation of the refrigeration system.

[0067] In one embodiment, under high outdoor temperature conditions (generally greater than 35°C), the refrigerant pressure and temperature of the liquid outlet from the condenser of the refrigeration system are relatively high. In order to improve the energy efficiency of the refrigeration system, it is necessary to reduce the temperature of the high-temperature and high-pressure liquid refrigerant output from the liquid reservoir to the electronic expansion valve. At this time, it is necessary to increase the opening of the flow valve to increase the heat exchange between the low-temperature and low-pressure gaseous refrigerant and the high-temperature and high-pressure liquid refrigerant in the liquid reservoir economizer, thereby achieving an increase in supercooling.

[0068] An example is given to illustrate the specific process of the subcooling control method of the refrigeration system provided in the embodiment of the present application.

[0069] Example 4: Calculate the subcooling (T2-T1) based on the second refrigerant temperature T2 at the condenser's refrigerant outlet and the first refrigerant temperature T1 at the accumulator's refrigerant outlet. Simultaneously detect and obtain the compressor's suction temperature. When the compressor's suction temperature is less than 15°C and the subcooling is less than 13°C, the flow valve opening is controlled to increase at a rate of 50 steps / minute. When the subcooling is greater than or equal to 13°C and less than 15°C, the rate is reduced to 20 steps / minute, and the flow valve opening is controlled to increase at a rate of 20 steps / minute. When the subcooling reaches 15°C, the flow valve remains inactive and maintains its current opening. When the compressor suction temperature is greater than or equal to 15°C and less than 18°C, the flow valve opening is controlled to decrease at a rate of 50 steps / minute. When the compressor suction temperature is greater than or equal to 18°C, the flow valve is immediately closed.

[0070] It's understandable that, in principle, for a refrigeration system, the greater the refrigerant's subcooling during cooling, the better. This increases the difference in enthalpy between the refrigerant inlet and outlet of the evaporator. For the same refrigerant flow rate, a greater subcooling yields a greater heat exchange capacity, leading to higher energy efficiency for the refrigeration system. However, this also increases the compressor's suction temperature and power consumption, which has a negative impact. Therefore, Example 4 implements a priority control mechanism based on the compressor's suction temperature and joint control of the flow valve based on suction temperature and subcooling. This allows for subcooling regulation while ensuring safe operation of the refrigeration system, improving the refrigeration system's energy efficiency.

[0071] An embodiment of the present application further provides a storage medium, which is a computer-readable storage medium and stores a computer program. When the computer program is executed by a processor, the above-mentioned subcooling control method of the refrigeration system is implemented.

[0072] The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory optionally includes a memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of the above-mentioned networks include but are not limited to the Internet, an intranet, a local area network, a mobile communication network and a combination thereof. The device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and are located in one place, or may be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0073] Those skilled in the art will appreciate that all or some of the steps and systems disclosed above can be implemented as software, firmware, hardware, or any suitable combination thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transient media). As is well known to those skilled in the art, the term computer storage media 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 storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVDs) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media typically includes 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.

[0074] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the present application.

Claims

1. A refrigeration system, characterized in that: include: an air return line, one end of the air return line being connected to the evaporator, and the other end of the air return line being connected to the condenser; A compressor, including an air intake and an air discharge port; The exhaust port is connected to the four-way valve of the return air pipeline; The liquid reservoir comprises a heat exchange tube, wherein the heat exchange tube comprises an air inlet and an air outlet; the air outlet of the liquid reservoir is respectively connected to the air intake and the four-way valve of the air return line; A gaseous refrigerant branch circuit is provided with a flow valve, one end of the gaseous refrigerant branch circuit is connected to the return air pipeline, and the other end of the gaseous refrigerant branch circuit is connected to the air inlet of the liquid reservoir; a temperature collection unit for collecting the intake air temperature of the intake port, the first refrigerant temperature of the refrigerant outlet of the liquid reservoir, and the second refrigerant temperature of the refrigerant outlet of the condenser; A controller is electrically connected to the flow valve and the temperature acquisition unit; the controller is used to: when the refrigeration system operates in the refrigeration mode, obtain the suction temperature, the first refrigerant temperature and the second refrigerant temperature in real time; subtract the first refrigerant temperature from the second refrigerant temperature to obtain the supercooling degree; when the suction temperature is lower than the first temperature threshold, control the flow valve to open and control the opening degree of the flow valve according to the supercooling degree and the preset supercooling threshold information, so that the gaseous refrigerant branch is conductive, and control the amount of gaseous refrigerant entering the heat exchange tube of the liquid storage device from the return air pipe.

2. The refrigeration system according to claim 1, characterized in that The liquid reservoir further includes a refrigerant outlet, and the temperature acquisition unit includes: a first refrigerant temperature sensing package; the first refrigerant temperature sensing package is arranged at the refrigerant outlet of the liquid reservoir.

3. The refrigeration system according to claim 1, wherein: The temperature acquisition unit further includes: an air intake temperature sensing package, which is arranged at the air intake port of the compressor.

4. The refrigeration system according to claim 1, wherein: The condenser includes a refrigerant outlet, and the temperature collection unit includes: a second refrigerant temperature sensing package; the second refrigerant temperature sensing package is arranged at the refrigerant outlet of the condenser.

5. A method for controlling subcooling degree of a refrigeration system, characterized in that: A controller for a refrigeration system according to any one of claims 1 to 4, wherein the refrigeration system further comprises: a return air pipeline, a compressor, a liquid accumulator, a gaseous refrigerant branch provided with a flow valve, and a temperature acquisition unit; the controller is electrically connected to the flow valve and the temperature acquisition unit; wherein one end of the return air pipeline is connected to the evaporator, and the other end of the return air pipeline is connected to the condenser; one end of the gaseous refrigerant branch is connected to the return air pipeline, and the other end of the gaseous refrigerant branch is connected to the air inlet of the liquid accumulator; The method comprises: When the refrigeration system operates in a refrigeration mode, the suction temperature of the suction port of the compressor, the first refrigerant temperature of the refrigerant outlet of the liquid accumulator, and the second refrigerant temperature of the refrigerant outlet of the condenser collected by the temperature collection unit are obtained in real time; Subtracting the first refrigerant temperature from the second refrigerant temperature to obtain a degree of supercooling; When the intake temperature is lower than a first temperature threshold, the flow valve is controlled to open and the opening degree of the flow valve is controlled according to the subcooling degree and the preset subcooling threshold information so as to allow the gaseous refrigerant branch to be conducted and to control the amount of gaseous refrigerant entering the heat exchange tube of the liquid storage device from the return air duct.

6. The method for controlling subcooling degree of a refrigeration system according to claim 5, wherein: The preset supercooling threshold information includes: a first supercooling threshold; The control of opening the flow valve and controlling the opening degree of the flow valve according to the subcooling degree and the preset subcooling degree threshold information to connect the gaseous refrigerant branch and control the amount of gaseous refrigerant entering the heat exchange pipe of the liquid accumulator from the return air pipeline includes: When the degree of subcooling is less than a first subcooling threshold, controlling the flow valve to open so that the gaseous refrigerant branch is connected; After the flow valve is controlled to open, the opening of the flow valve is controlled to increase according to a first preset rate.

7. The method for controlling subcooling degree of a refrigeration system according to claim 6, wherein: The preset supercooling threshold information further includes: a second supercooling threshold that is greater than the first supercooling threshold; The control of opening the flow valve and controlling the opening degree of the flow valve according to the subcooling degree and the preset subcooling degree threshold information to connect the gaseous refrigerant branch and control the amount of gaseous refrigerant entering the heat exchange pipe of the liquid accumulator from the return air pipeline includes: When the degree of subcooling is greater than or equal to a first subcooling threshold and less than a second subcooling threshold, the flow valve is kept open, and the opening of the flow valve is controlled to continue to increase according to a second preset rate; wherein the second preset rate is less than the first preset rate; When the subcooling degree is equal to a second subcooling degree threshold, the flow valve is controlled to maintain a current opening degree.

8. The method for controlling subcooling degree of a refrigeration system according to claim 5, wherein: The method further comprises: When the intake air temperature is greater than or equal to a first temperature threshold and less than a second temperature threshold, controlling the opening of the flow valve to decrease according to a first preset rate; wherein the second temperature threshold is greater than the first temperature threshold; When the intake air temperature is greater than or equal to the second temperature threshold, the flow valve is closed.

9. An electronic device, characterized in that: The refrigeration system comprises the refrigeration system according to any one of claims 1 to 4, wherein a controller of the refrigeration system is capable of executing the subcooling control method of the refrigeration system according to any one of claims 5 to 8.

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 subcooling control method for a refrigeration system according to any one of claims 5 to 8.

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