Superheat degree control method and device, refrigerating system and equipment

Abstract

The invention relates to the technical field of refrigerating systems, and provides a superheat degree control method and device, a refrigerating system and equipment. The control valve is connected to an inlet of the evaporator and is suitable for controlling the liquid supply amount of the refrigerant entering the evaporator; the first detection module is suitable for detecting the current pressure and the current temperature of the refrigerant at the outlet of the evaporator; the heater is connected to the downstream of the first detection module in the flowing direction of the refrigerant; and the second detection module is connected to the downstream of the heater in the flowing direction of the refrigerant and is suitable for detecting the compensation temperature of the heated refrigerant. In this way, the current superheat degree is controlled to be equal to 0 and the compensation superheat degree is controlled to be larger than 0, the superheat degree of the refrigerant at the outlet of the evaporator can be basically maintained at about 0 DEG C, at the moment, it can be guaranteed that the refrigerant entering the compressor is completely in a gaseous state, the liquid impact phenomenon is avoided, and the refrigerating system can operate under the low superheat degree working condition; and the energy-saving effect of the refrigerating system is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration systems, and in particular, to a superheat control method, device, refrigeration system and equipment. Background Art

[0002] Refrigeration systems are widely used in fields such as air conditioners, refrigeration and cold storage, and industrial cooling. Its basic principle is to transfer heat from a low-temperature area to a high-temperature area by the phase change of a circulating working medium (refrigerant) under different temperature and pressure conditions. A typical vapor compression refrigeration cycle includes four basic processes: compression, condensation, expansion, and evaporation. Superheat refers to the degree to which the temperature of the refrigerant exceeds the saturation temperature after passing through the evaporator. Specifically, it is the difference between the actual temperature at the outlet of the evaporator and the saturation temperature corresponding to the pressure at that point.

[0003] The existence of superheat is crucial for ensuring the stable operation of the refrigeration system. In related technologies, the gaseous refrigerant at the outlet of the dry evaporator commonly used in refrigeration systems generally has a superheat of about 5-10°C. By controlling the superheat, it is possible to prevent liquid refrigerant from entering the compressor, reducing the risk of equipment damage caused by liquid hammer phenomenon. At the same time, maintaining an appropriate superheat can maximize the heat exchange efficiency of the evaporator, thereby improving the energy efficiency ratio of the entire system.

[0004] How to further reduce the superheat and improve the energy-saving effect of the refrigeration system while maintaining the stable operation of the system has become an important issue that needs to be solved urgently. Summary of the Invention

[0005] The present invention provides a superheat control method, device, refrigeration system and equipment to solve the defect that it is difficult to further reduce the superheat in the prior art and it is difficult to further improve the energy-saving effect of the refrigeration system, and can enable the refrigeration system to operate under a lower superheat condition, effectively improving the energy-saving effect of the refrigeration system.

[0006] The present invention provides a refrigeration system, including: An evaporator; A control valve connected to the inlet of the evaporator, suitable for controlling the liquid supply amount of the refrigerant entering the evaporator; A first detection module suitable for detecting the current pressure and current temperature of the refrigerant at the outlet of the evaporator; A heater connected downstream of the first detection module along the refrigerant flow direction; A second detection module connected downstream of the heater along the refrigerant flow direction, suitable for detecting the compensated temperature of the heated refrigerant.

[0007] A refrigeration system provided according to the present invention, the first detection module includes a pressure sensor and a first temperature sensor connected to the outlet of the evaporator.

[0008] A refrigeration system provided according to the present invention, the first temperature sensor is located downstream of the pressure sensor along the flow direction of the refrigerator.

[0009] A refrigeration system provided according to the present invention, the second detection module includes a second temperature sensor.

[0010] A refrigeration system provided according to the present invention, the control valve includes an electronic expansion valve.

[0011] The present invention also provides a superheat control method, applicable to the refrigeration system described in any one of the above, including the following steps: Obtain the current pressure and current temperature at the outlet of the evaporator; Determine the current superheat of the refrigerant according to the current pressure and the current temperature; Provide temperature compensation for the refrigerant and obtain the compensated temperature of the refrigerant after temperature compensation; Determine the compensated superheat according to the current pressure and the compensated temperature; Control the flow rate of the refrigerant according to the current superheat and the compensated superheat, so that the current superheat is equal to 0 and the compensated superheat is greater than 0.

[0012] According to a superheat control method provided by the present invention, the step of controlling the flow rate of the refrigerant according to the current superheat and the compensated superheat, so that the current superheat is equal to 0 and the compensated superheat is greater than 0, includes When it is determined that the current superheat is greater than 0 and the compensated superheat is greater than 0, increase the flow rate of the refrigerant; When it is determined that the current superheat is equal to 0 and the compensated superheat is equal to 0, decrease the flow rate of the refrigerant.

[0013] When it is determined that the current superheat is equal to 0 and the compensated superheat is greater than 0, maintain the current flow rate of the refrigerant.

[0014] The present invention also provides a superheat control device for implementing the superheat control method described in any one of the above, including: An acquisition module, suitable for acquiring the current pressure and current temperature at the outlet of the evaporator, and the compensated temperature of the refrigerant after temperature compensation; A processing module, suitable for determining the current superheat according to the current pressure and the current temperature, and determining the compensated superheat according to the current pressure and the compensated temperature; A control module, adapted to control the flow rate of the refrigerant according to the current superheat degree and the compensated superheat degree, such that the current superheat degree is equal to 0 and the compensated superheat degree is greater than 0.

[0015] According to an apparatus for controlling superheat degree provided by the present invention, the processing module includes: A first processing module, adapted to determine the current superheat degree of the refrigerant according to the current pressure, the current temperature, and the corresponding relationship between the refrigerant pressure and the saturation temperature; A second processing module, adapted to determine the compensated superheat degree of the refrigerant according to the current pressure, the compensated temperature, and the corresponding relationship between the refrigerant pressure and the saturation temperature.

[0016] According to an apparatus for controlling superheat degree provided by the present invention, the control module includes: A first control unit, adapted to increase the flow rate of the refrigerant when the current superheat degree is greater than 0 and the compensated superheat degree is greater than 0; A second control unit, adapted to decrease the flow rate of the refrigerant when the current superheat degree is equal to 0 and the compensated superheat degree is equal to 0.

[0017] A third control unit, adapted to maintain the current flow rate of the refrigerant when the current superheat degree is equal to 0 and the compensated superheat degree is greater than 0.

[0018] The present invention further provides a refrigeration device, including the refrigeration system according to any one of the above and the apparatus for controlling superheat degree according to any one of the above.

[0019] The present invention further provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the method for controlling superheat degree according to any one of the above when executing the program.

[0020] The present invention further provides a non-transitory computer-readable storage medium, having a computer program stored thereon, wherein the computer program implements the method for controlling superheat degree according to any one of the above when executed by a processor.

[0021] The present invention further provides a computer program product, including a computer program, wherein the computer program implements the method for controlling superheat degree according to any one of the above when executed by a processor.

[0022] The superheat control method, device, refrigeration system and equipment provided by the present invention increase the refrigerant flow rate when the current superheat is greater than 0 and the compensated superheat is greater than 0, thereby reducing the superheat of the refrigerant and improving the energy-saving effect of the refrigeration system; when the current superheat is equal to 0 and the compensated superheat is equal to 0, the refrigerant flow rate is reduced to ensure that the refrigerant is completely vaporized and prevent liquid refrigerant from entering the compressor and causing liquid hammer phenomenon; when the current superheat is equal to 0 and the compensated superheat is greater than 0, the superheat of the refrigerant at the outlet of the evaporator is basically maintained at about 0°C. By maintaining the current refrigerant flow rate, it can not only ensure that the refrigerant entering the compressor is completely gaseous, avoiding liquid hammer phenomenon, but also enable the refrigeration system to operate under a lower superheat condition, effectively improving the energy-saving effect of the refrigeration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 FIG. is a schematic structural diagram of a refrigeration system provided by an embodiment of the present invention.

[0025] Figure 2 FIG. is a schematic flow chart of a superheat control method provided by an embodiment of the present invention.

[0026] Figure 3 FIG. is a schematic structural diagram of a superheat control device provided by the present invention.

[0027] Figure 4 FIG. is a schematic structural diagram of an electronic device provided by the present invention.

[0028] REFERENCE NUMERALS: 110, evaporator; 120, control valve; 130, pressure sensor; 140, first temperature sensor; 150, heater; 160, second temperature sensor; 210, acquisition module; 220, processing module; 230, control module; 310, processor; 320, communication interface; 330, memory; 340, communication bus. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without any creative work fall within the scope of protection of the present invention.

[0030] To better understand the superheat control method, device, refrigeration system and equipment provided by the embodiments of the present invention, its application background will be introduced first. The refrigeration system is widely used in fields such as air conditioners, refrigeration and cold storage, and industrial cooling. Superheat refers to the difference between the actual temperature at the outlet of the evaporator and the saturation temperature at the corresponding pressure at this point, and it is an important parameter in the refrigeration system.

[0031] The existence of superheat is crucial for ensuring the stable operation of the refrigeration system. By controlling the superheat, it is possible to prevent the refrigerant in liquid form from entering the compressor, reducing the risk of equipment damage caused by liquid hammer phenomenon. At the same time, maintaining an appropriate superheat can maximize the heat exchange efficiency of the evaporator, thereby improving the energy efficiency ratio of the entire system.

[0032] Since the temperature and pressure of the refrigerant do not change during phase change, and it is only when the temperature of the refrigerant exceeds its saturation temperature that it can be confirmed to enter the superheat state. Therefore, in related technologies, the gaseous refrigerant at the outlet of the dry evaporator commonly used in refrigeration systems generally has a superheat of about 5 - 10°C.

[0033] Theoretically speaking, appropriately reducing the superheat can reduce the power consumption of the compressor and the heat load of the condenser, while increasing the heat exchange efficiency of the evaporator, thereby improving the energy-saving effect of the refrigeration system. In the most ideal state, when the superheat is exactly equal to 0, that is, the refrigerant is exactly completely converted from liquid to gas, and the temperature is equal to the saturation temperature at the current pressure, the energy-saving effect of the refrigeration system reaches the best. However, since the superheat is generally measured by a pressure sensor and a temperature sensor connected to the outlet of the evaporator, and the temperature and pressure of the refrigerant do not change in the two-phase region, this results in that when the superheat measured by the temperature sensor is equal to 0, the refrigerant may be in a state of two-phase coexistence. Therefore, it is difficult to measure the state where the superheat is exactly equal to 0 by existing means, which leads to great difficulties in controlling the superheat of the refrigeration system and it is difficult to further reduce the superheat.

[0034] Therefore, how to further reduce the superheat while maintaining the stable operation of the system and improve the energy-saving effect of the refrigeration system has become an important issue that needs to be solved urgently at present.

[0035] Based on the above problems, the embodiments of the present invention provide a superheat control method, device, refrigeration system and equipment, which can enable the refrigeration system to operate under a lower superheat condition and effectively improve the energy-saving effect of the refrigeration system.

[0036] The following will Figures 1 - 4 describe the superheat control method, device, refrigeration system and equipment of the present invention.

[0037] Referring to Figure 1 , a refrigeration system includes an evaporator 110, a control valve 120, a first detection module, a heater 150 and a second detection module; wherein, the evaporator 110 is a key component in the refrigeration system, mainly absorbing heat through the evaporation of the refrigerant to achieve the refrigeration effect. One side of the evaporator 110 is provided with an inlet for the liquid refrigerant to enter, and the other side is provided with an outlet for the gaseous refrigerant after heat absorption to be discharged; the control valve 120 is connected to the inlet of the evaporator 110 and is suitable for controlling the liquid supply amount of the refrigerant entering the evaporator 110; the first detection module is suitable for detecting the current pressure and temperature of the refrigerant at the outlet of the evaporator 110; the heater 150 is connected downstream of the first detection module along the refrigerant flow direction and is suitable for heating the refrigerant; the second detection module is connected downstream of the heater 150 along the refrigerant flow direction and is suitable for detecting the temperature of the heated refrigerant.

[0038] In practical applications, the low-temperature liquid refrigerant enters the evaporator 110 through the inlet. The evaporator 110 absorbs heat through the evaporation of the refrigerant to achieve the refrigeration effect. The refrigerant after heat absorption is discharged from the outlet of the evaporator 110. The first detection module can detect the current pressure and current temperature of the refrigerant at the outlet of the evaporator 110. According to the measured current pressure, current temperature, and the corresponding relationship between the refrigerant pressure and the saturation temperature, the current superheat of the refrigerant can be obtained. The heater 150 can heat the refrigerant. The second detection module can detect the compensated temperature of the heated refrigerant. According to the measured current pressure, compensated temperature, and the corresponding relationship between the refrigerant pressure and the saturation temperature, the compensated superheat of the refrigerant after heating can be obtained. By adjusting the opening degree of the control valve 120 according to the current superheat and the compensated superheat, the refrigeration system can operate under a lower superheat condition. The specific principle is as follows: When the current superheat is greater than 0 and the compensated superheat is greater than 0, it indicates that the refrigerant has been completely evaporated into a gas at this time, and the superheat of the refrigerant is greater than 0. In this condition, it can ensure that the refrigerant entering the compressor is completely gaseous, avoiding the liquid hammer phenomenon. However, a higher superheat will affect the energy-saving effect of the refrigeration system.

[0039] When the current superheat is equal to 0 and the compensated superheat is greater than 0, it indicates that the refrigerant is basically completely evaporated into a gaseous state or exactly completely evaporated into a gaseous state at this time. Only a very small temperature compensation needs to be provided by the heater 150 to make the superheat of the refrigerant greater than 0. At this time, the superheat of the refrigerant at the outlet of the evaporator 110 is basically maintained at about 0 °C. Under this condition, it can not only ensure that the refrigerant entering the compressor is completely in a gaseous state, avoiding liquid hammer phenomenon, but also enable the refrigeration system to operate under a lower superheat condition, effectively improving the energy-saving effect of the refrigeration system.

[0040] When the current superheat is equal to 0 and the compensated superheat is equal to 0, it indicates that the refrigerant is in a two-phase state at this time. Even with the temperature compensation provided by the heater 150, the refrigerant still fails to be completely evaporated into a gaseous state. In this condition, the liquid refrigerant will enter the compressor and cause liquid hammer phenomenon, resulting in equipment damage.

[0041] Based on the above principle, when the current superheat is greater than 0 and the compensated superheat is greater than 0, increase the refrigerant flow rate to reduce the superheat of the refrigerant and improve the energy-saving effect of the refrigeration system; when the current superheat is equal to 0 and the compensated superheat is equal to 0, reduce the refrigerant flow rate to ensure that the refrigerant is completely vaporized and avoid the liquid refrigerant from entering the compressor and causing liquid hammer phenomenon; when the current superheat is equal to 0 and the compensated superheat is greater than 0, at this time, the superheat of the refrigerant at the outlet of the evaporator 110 is basically maintained at about 0 °C. By maintaining the current refrigerant flow rate, it can not only ensure that the refrigerant entering the compressor is completely in a gaseous state, avoiding liquid hammer phenomenon, but also enable the refrigeration system to operate under a lower superheat condition, effectively improving the energy-saving effect of the refrigeration system.

[0042] It can be understood that the evaporator 110, as a key component in the refrigeration system, mainly absorbs heat through the evaporation of the refrigerant to achieve the refrigeration effect. According to different requirements and different types of refrigeration equipment, the specific structure of the evaporator 110 will correspondingly vary. Common evaporators 110 include finned-tube evaporators, spiral-tube evaporators, plate evaporators, honeycomb jacket evaporators for biological products and wine fermentation tanks, channel jacket evaporators for biological products and wine fermentation tanks, etc. The specific structures of different types of evaporators 110 can refer to the existing technology and will not be elaborated in the embodiments of the present invention. In addition, the specific type of the evaporator 110 can be selected according to actual needs and will not be specifically limited in the embodiments of the present invention.

[0043] In an optional embodiment, the control valve 120 can adopt an electronic expansion valve, and the electronic expansion valve can perform stepless adjustment on the valve opening according to the electrical signals fed back by the first detection module and the second detection module, so as to achieve precise control of the refrigerant flow rate.

[0044] It should be noted that the specific structure of the electronic expansion valve can refer to the prior art and will not be elaborated in the embodiments of the present invention.

[0045] In an optional embodiment of the present invention, the first detection module includes a pressure sensor 130 and a first temperature sensor 140 connected to the outlet of the evaporator 110. The pressure sensor 130 can detect the current pressure of the refrigerant at the outlet of the evaporator 110, and determine the saturation temperature of the refrigerant at the current pressure according to the mapping relationship between the pressure of the refrigerant and the saturation temperature. The first temperature sensor 140 can detect the current temperature of the refrigerant at the outlet of the evaporator 110. By subtracting the saturation temperature of the refrigerant at the current pressure from the current temperature of the refrigerant, the current superheat of the refrigerant can be obtained.

[0046] In an embodiment of the present invention, the first temperature sensor 140 is located downstream of the pressure sensor 130 along the refrigerant flow direction to ensure the accuracy and stability of temperature and pressure measurement.

[0047] In an optional embodiment of the present invention, the second detection module includes a second temperature sensor 160. The second temperature sensor 160 can detect the compensation temperature of the heated refrigerant. By subtracting the saturation temperature of the refrigerant at the current pressure from the compensation temperature of the refrigerant, the compensation superheat of the heated refrigerant can be obtained.

[0048] It should be noted here that in the embodiments of the present invention, the heater 150 is mainly used to provide temperature compensation for the refrigerant, so as to increase an additional superheat. By comparing the two superheats, the phase state of the refrigerant at the outlet of the evaporator 110 can be judged, so as to better determine the working condition with a superheat of 0 or close to 0. In other words, the temperature compensation of the heater 150 to the refrigerant is very small, and the influence on the refrigerant pressure can be basically ignored. Therefore, the current pressure measured by the pressure sensor 130 and the compensation temperature measured by the second temperature sensor 160 can be used to determine the superheat of the heated refrigerant. Of course, in order to further improve the detection accuracy, a pressure detection element can be arranged downstream of the heater 150 to detect the compensation pressure of the heated refrigerant, which is not limited in the embodiments of the present invention.

[0049] It can be understood that according to different working principles, the pressure sensor 130 and the temperature sensor can have various optional types, which can be specifically selected according to actual needs and are not specifically limited in the embodiments of the present invention. In addition, the specific structures of each type of pressure sensor 130 and temperature sensor can refer to the prior art and will not be elaborated in the embodiments of the present invention.

[0050] In another alternative embodiment of the present invention, the first detection module and / or the second detection module may also adopt an integrated temperature and pressure sensor, so as to realize the simultaneous measurement of temperature and pressure.

[0051] In one embodiment of the present invention, the heater 150 may be an electric heater. Through the electric heater 150, temperature compensation can be provided for the refrigerant, adding an additional small degree of superheat, but not completely vaporizing the incompletely vaporized refrigerant. The heating power of the heater 150 can be configured according to actual needs, but it is necessary to ensure that the compensated degree of superheat can be measured by the second temperature sensor 160, so as to adjust the control valve 120 according to the current degree of superheat and the compensated degree of superheat. The specific value or threshold of the compensated degree of superheat can be set according to actual needs and is not specifically limited in the embodiments of the present invention.

[0052] The superheat control method provided by the present invention will be described below. The superheat control method described below can be mutually corresponding and referred to with the refrigeration system described above.

[0053] Refer to Figure 2 , a superheat control method, applicable to the refrigeration system provided in any of the above embodiments. The method includes the following steps: Step S10: Obtain the current pressure and current temperature at the outlet of the evaporator 110.

[0054] Specifically, the current pressure of the refrigerant at the outlet of the evaporator 110 can be determined by obtaining the pressure value measured by the first detection module, and the current temperature of the refrigerant at the outlet of the evaporator 110 can be determined by the temperature value measured by the first detection module.

[0055] Step S20: Determine the current superheat according to the current pressure and current temperature.

[0056] Specifically, according to the mapping relationship between the pressure and saturation temperature of the refrigerant, the saturation temperature of the refrigerant at the current pressure can be determined. By subtracting the current temperature from the saturation temperature of the refrigerant at the current pressure, the current superheat of the refrigerant can be obtained.

[0057] Step S30: Provide temperature compensation for the refrigerant and obtain the compensated temperature of the refrigerant after temperature compensation.

[0058] Specifically, the heater 150 is used to provide temperature compensation for the refrigerant, thereby adding an additional small degree of superheat, but it is necessary to ensure that the compensated temperature can be collected by temperature detection elements such as temperature sensors. The compensated temperature of the refrigerant after temperature compensation can be determined by the temperature value measured by the second detection module.

[0059] Step S40: Determine the compensated superheat according to the current pressure and the compensated temperature.

[0060] Specifically, according to the mapping relationship between the pressure of the refrigerant and the saturation temperature, the saturation temperature of the refrigerant at the current pressure can be determined. By subtracting the compensation temperature from the saturation temperature of the refrigerant at the current pressure, the current superheat of the refrigerant can be obtained.

[0061] It should be noted here that the temperature compensation of the heater 150 for the refrigerant is very small, and its influence on the refrigerant pressure can be basically ignored. Therefore, the superheat of the heated refrigerant can be determined by using the current pressure measured by the pressure sensor 130 and the compensation temperature measured by the second temperature sensor 160.

[0062] Step S50: Control the flow rate of the refrigerant according to the current superheat and the compensated superheat, so that the current superheat is equal to 0 and the compensated superheat is greater than 0.

[0063] Specifically, during actual operation, the refrigeration system has the following working conditions: 1) When the current superheat is greater than 0 and the compensated superheat is greater than 0, it indicates that the refrigerant has been completely evaporated into a gas at this time, and the superheat of the refrigerant is greater than 0. In this working condition, it can be ensured that the refrigerant entering the compressor is completely in a gaseous state, avoiding the liquid hammer phenomenon. However, the higher superheat will affect the energy-saving effect of the refrigeration system.

[0064] 2) When the current superheat is equal to 0 and the compensated superheat is greater than 0, it indicates that the refrigerant is basically completely evaporated into a gas or just completely evaporated into a gas at this time. Only a very small temperature compensation provided by the heater 150 is required to make the superheat of the refrigerant greater than 0. At this time, the superheat of the refrigerant at the outlet of the evaporator 110 basically remains around 0°C. In this working condition, it can not only ensure that the refrigerant entering the compressor is completely in a gaseous state, avoiding the liquid hammer phenomenon, but also enable the refrigeration system to operate under a lower superheat condition, effectively improving the energy-saving effect of the refrigeration system.

[0065] 3) When the current superheat is equal to 0 and the compensated superheat is equal to 0, it indicates that the refrigerant is in a two-phase state at this time. Even with the temperature compensation provided by the heater 150, the refrigerant still fails to be completely evaporated into a gas. In this working condition, the liquid refrigerant will enter the compressor, causing the liquid hammer phenomenon and damaging the equipment.

[0066] Therefore, controlling the flow rate of the refrigerant according to the current superheat and the compensated superheat, so that the current superheat is equal to 0 and the compensated superheat is greater than 0, can not only ensure that the refrigerant entering the compressor is completely in a gaseous state, avoiding the liquid hammer phenomenon, but also enable the refrigeration system to operate under a lower superheat condition, effectively improving the energy-saving effect of the refrigeration system.

[0067] In one embodiment of the present invention, the control valve 120 is specifically adjusted by the following steps: Step S500: When it is determined that the current superheat degree is greater than 0 and the compensated superheat degree is greater than 0, increase the refrigerant flow rate.

[0068] Specifically, when the current superheat degree is greater than 0 and the compensated superheat degree is greater than 0, it indicates that the refrigerant is completely in a gaseous state at this time and there is a certain superheat degree. By increasing the opening degree of the control valve 120, the refrigerant flow rate is increased, thereby reducing the superheat degree and improving the energy-saving effect of the refrigeration system.

[0069] Step S510: When it is determined that the current superheat degree is equal to 0 and the compensated superheat degree is equal to 0, reduce the refrigerant flow rate.

[0070] Specifically, when the current superheat degree is equal to 0 and the compensated superheat degree is equal to 0, it indicates that the refrigerant is in a gas-liquid coexistence state at this time. By reducing the opening degree of the control valve 120, the refrigerant flow rate is reduced, thereby increasing the superheat degree, ensuring that the refrigerant is completely evaporated into a gaseous state, and preventing liquid refrigerant from entering the compressor and causing a liquid hammer phenomenon.

[0071] Step S520: When it is determined that the current superheat degree is equal to 0 and the compensated superheat degree is greater than 0, maintain the current refrigerant flow rate.

[0072] Specifically, when the current superheat degree is equal to 0 and the compensated superheat degree is greater than 0, it indicates that the refrigerant is basically completely evaporated into a gaseous state or just completely evaporated into a gaseous state. The current superheat degree at the outlet of the evaporator 110 is maintained at about 0 °C, thereby achieving the best working state. By maintaining the current refrigerant flow rate, it can not only ensure that the refrigerant entering the compressor is completely in a gaseous state, avoiding the liquid hammer phenomenon, but also enable the refrigeration system to operate under a lower superheat degree condition, effectively improving the energy-saving effect of the refrigeration system.

[0073] Specifically, the refrigerant flow rate can be dynamically adjusted based on the PID (Proportional-Integral-Derivative Controller) closed-loop regulation algorithm, so as to maintain the current superheat degree at the outlet of the evaporator 110 at 0 °C, and the compensated superheat degree is maintained near a certain value greater than 0 or within a certain threshold range.

[0074] On the other hand, referring to Figure 3 , the present invention further provides a superheat degree control device for implementing the superheat degree control method provided in any of the above embodiments, including an acquisition module 210, a processing module 220, and a control module 230; wherein, the acquisition module 210 is adapted to acquire the current pressure and current temperature at the outlet of the evaporator 110, and the compensated temperature of the refrigerant after temperature compensation; the processing module 220 is adapted to determine the current superheat degree according to the current pressure and current temperature, and determine the compensated superheat degree according to the current pressure and compensated temperature; the control module 230 is adapted to control the refrigerant flow rate according to the current superheat degree and the compensated superheat degree, so that the current superheat degree is equal to 0 and the compensated superheat degree is greater than 0.

[0075] In an alternative embodiment of the present invention, the processing module 220 includes a first processing unit and a second processing unit. The first processing unit is configured to determine the current superheat degree of the refrigerant according to the current pressure, the current temperature, and the mapping relationship between the refrigerant pressure and the saturation temperature. The second processing unit is configured to determine the compensated superheat degree of the refrigerant according to the current pressure, the compensated temperature, and the mapping relationship between the refrigerant pressure and the saturation temperature.

[0076] In an alternative embodiment of the present invention, the control module 230 includes: a first control unit, a second control unit, and a third control unit. Among them, the first control unit is adapted to increase the flow rate of the refrigerant when the current superheat degree is greater than 0 and the compensated superheat degree is greater than 0. The second control unit is adapted to decrease the flow rate of the refrigerant when the current superheat degree is equal to 0 and the compensated superheat degree is equal to 0. The third control unit is adapted to maintain the current flow rate of the refrigerant when the current superheat degree is equal to 0 and the compensated superheat degree is greater than 0.

[0077] It can be understood that, without contradiction, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples.

[0078] On the other hand, the present invention also provides a refrigeration device, including the refrigeration system provided in any of the above embodiments and the superheat degree control device provided in any of the above embodiments.

[0079] On the other hand, the present invention also provides an electronic device, Figure 4 illustrating a schematic physical structure diagram of an electronic device, as Figure 4 shown, the electronic device may include: a processor 310, a communication interface 320, a memory 330, and a communication bus 340. Among them, the processor 310, the communication interface 320, and the memory 330 complete communication with each other through the communication bus 340. The processor 310 can call the logical instructions in the memory 330 to execute the superheat degree control method, and the method includes: obtaining the current pressure and the current temperature at the outlet of the evaporator 110; determining the current superheat degree of the refrigerant according to the saturation temperature corresponding to the current pressure and the current temperature; providing temperature compensation for the refrigerant, and obtaining the compensated temperature of the refrigerant after temperature compensation; determining the compensated superheat degree according to the saturation temperature corresponding to the current pressure and the compensated temperature; controlling the flow rate of the refrigerant according to the current superheat degree and the compensated superheat degree, so that the current superheat degree is equal to 0 and the compensated superheat degree is greater than 0.

[0080] In addition, when the logical instructions in the above-mentioned memory 330 can be implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0081] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the superheat control method provided by the above-mentioned various methods. The method includes: obtaining the current pressure and current temperature at the outlet of the evaporator 110; determining the current superheat of the refrigerant according to the saturation temperature corresponding to the current pressure and the current temperature; providing temperature compensation to the refrigerant and obtaining the compensated temperature of the refrigerant after temperature compensation; determining the compensated superheat according to the saturation temperature corresponding to the current pressure and the compensated temperature; controlling the flow rate of the refrigerant according to the current superheat and the compensated superheat so that the current superheat is equal to 0 and the compensated superheat is greater than 0.

[0082] In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it realizes the execution of the superheat control method provided by the above-mentioned various methods. The method includes: obtaining the current pressure and current temperature at the outlet of the evaporator 110; determining the current superheat of the refrigerant according to the saturation temperature corresponding to the current pressure and the current temperature; providing temperature compensation to the refrigerant and obtaining the compensated temperature of the refrigerant after temperature compensation; determining the compensated superheat according to the saturation temperature corresponding to the current pressure and the compensated temperature; controlling the flow rate of the refrigerant according to the current superheat and the compensated superheat so that the current superheat is equal to 0 and the compensated superheat is greater than 0.

[0083] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without creative effort.

[0084] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A refrigeration system, characterized in that: include: Evaporator (110); A control valve (120) connected to the inlet of the evaporator (110) and adapted to control the amount of refrigerant supplied into the evaporator (110); A first detection module, adapted to detect the current pressure and current temperature of the refrigerant at the outlet of the evaporator (110); a heater (150), connected downstream of the first detection module along the refrigerant flow direction; The second detection module is connected to the downstream of the heater (150) along the flow direction of the refrigerant and is suitable for detecting the compensation temperature of the heated refrigerant.

2. The refrigeration system according to claim 1, characterized in that: The first detection module comprises a pressure sensor (130) and a first temperature sensor (140) connected to the outlet of the evaporator (110).

3. The refrigeration system according to claim 1, characterized in that: The second detection module includes a second temperature sensor (160).

4. A superheat control method, characterized in that: A refrigeration system according to any one of claims 1 to 3, comprising the following steps: Obtaining the current pressure and current temperature at the outlet of the evaporator (110); determining a current superheat of the refrigerant according to the current pressure and the current temperature; Providing temperature compensation for the refrigerant and obtaining a compensation temperature of the refrigerant after temperature compensation; Determining a compensated superheat according to the current pressure and the compensated temperature; The flow rate of the refrigerant is controlled according to the current superheat and the compensated superheat, so that the current superheat is equal to 0 and the compensated superheat is greater than 0.

5. The superheat control method according to claim 4, characterized in that: The flow rate of the refrigerant is controlled according to the current superheat and the compensated superheat, so that the current superheat is equal to 0 and the compensated superheat is greater than 0, include, When it is determined that the current superheat is greater than 0 and the compensated superheat is greater than 0, increasing the flow rate of the refrigerant; When it is determined that the current superheat is equal to 0 and the compensated superheat is equal to 0, the flow rate of the refrigerant is reduced. When it is determined that the current superheat is equal to 0 and the compensated superheat is greater than 0, the current flow rate of the refrigerant is maintained.

6. A superheat control device, characterized in that: The method for implementing the superheat control method according to any one of claims 4 to 5 comprises: An acquisition module (210) adapted to acquire the current pressure and current temperature at the outlet of the evaporator (110), and the compensated temperature of the refrigerant after temperature compensation; A processing module (220) is adapted to determine a current superheat according to the current pressure and the current temperature, and to determine a compensated superheat according to the current pressure and the compensated temperature; The control module (230) is adapted to control the flow rate of the refrigerant according to the current superheat and the compensated superheat, so that the current superheat is equal to 0 and the compensated superheat is greater than 0.

7. The superheat control device according to claim 6, characterized in that: The processing module (220) comprises: A first processing module (220) is adapted to determine a current superheat of the refrigerant according to the current pressure, the current temperature, and a corresponding relationship between the refrigerant pressure and the saturation temperature; The second processing module (220) is adapted to determine the compensated superheat of the refrigerant according to the current pressure, the compensation temperature, and the corresponding relationship between the refrigerant pressure and the saturation temperature.

8. The superheat control device according to claim 6, characterized in that: The control module (230) comprises: A first control unit, adapted to increase the flow rate of the refrigerant when the current superheat is greater than 0 and the compensated superheat is greater than 0; The second control unit is adapted to reduce the flow rate of the refrigerant when the current superheat is equal to 0 and the compensated superheat is equal to 0. The third control unit is adapted to maintain the current flow rate of the refrigerant when the current superheat is equal to 0 and the compensated superheat is greater than 0.

9. A refrigeration device, characterized in that: It comprises a refrigeration system as described in any one of claims 1 to 3 and a superheat control device as described in any one of claims 6 to 8.

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