Superheat degree control device, refrigerating system and equipment

Abstract

The utility model relates to the technical field of refrigerating systems, and provides a superheat degree control 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 utility model relates to the technical field of refrigeration system especially relates to a superheat control device, refrigeration system and equipment. BACKGROUND

[0002] The refrigeration system is widely used in air conditioner, freezing and refrigeration, industrial cooling and other fields, and its basic principle is to realize the heat transfer from low temperature area to high temperature area through the phase change of circulating working medium (refrigerant) under different temperature and pressure conditions, and a typical vapor compression refrigeration cycle includes four basic processes of compression, condensation, expansion and evaporation. The superheat refers to the degree that 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 under the corresponding pressure.

[0003] The existence of superheat is crucial to ensure the stable operation of the refrigeration system. In the related art, the gaseous refrigerant at the outlet of the dry evaporator commonly used in the refrigeration system has a superheat of about 5-10 DEG C. By controlling the superheat, the liquid form of refrigerant can be avoided from entering the compressor, reducing the risk of equipment damage caused by liquid knock phenomenon, and at the same time, maintaining 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 under the premise of maintaining the stable operation of the system and improve the energy saving effect of the refrigeration system has become an important issue to be solved at present. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of superheat control device, refrigeration system and equipment to solve the defects that superheat is difficult to further reduce in prior art, and the energy saving effect of refrigeration system is difficult to further improve, refrigeration system can be operated under lower superheat condition, effectively improve the energy saving effect of refrigeration system.

[0006] The utility model provides a kind of refrigeration system, comprising:

[0007] evaporator;

[0008] control valve, is connected at the inlet of the evaporator, is suitable for controlling the liquid supply amount of refrigerant entering the evaporator;

[0009] first detection module, suitable for detecting the current pressure and current temperature of the refrigerant at the outlet of the evaporator;

[0010] heater, is connected to the downstream of the first detection module along the refrigerant flow direction;

[0011] A second detection module is connected downstream of the heater along the flow direction of the refrigerant and is adapted to detect a compensation temperature of the heated refrigerant.

[0012] According to the refrigeration system provided by the utility model, the first detection module comprises a pressure sensor and a first temperature sensor connected at the outlet of the evaporator.

[0013] According to the refrigeration system provided by the utility model, the first temperature sensor is located downstream of the pressure sensor along the flow direction of the refrigerant.

[0014] According to the refrigeration system provided by the utility model, the second detection module comprises a second temperature sensor.

[0015] According to the refrigeration system provided by the utility model, the control valve comprises an electronic expansion valve.

[0016] The utility model also provides a superheat control method, be applied to the refrigeration system of any one described above, comprising the following steps:

[0017] Obtaining the current pressure and the current temperature at the outlet of the evaporator;

[0018] According to the current pressure and the current temperature, the current superheat of the refrigerant is determined;

[0019] Temperature compensation is provided to the refrigerant, and the compensation temperature of the refrigerant after temperature compensation is obtained;

[0020] According to the current pressure and the compensation temperature, the compensation superheat is determined;

[0021] According to the current superheat and the compensation superheat, the flow of the refrigerant is controlled, so that the current superheat is equal to 0, and the compensation superheat is greater than 0.

[0022] According to the superheat control method provided by the utility model, according to the current superheat and the compensation superheat control refrigerant flow, so that the current superheat is equal to 0, and the compensation superheat is greater than 0, comprising,

[0023] When the current superheat is greater than 0 and the compensation superheat is greater than 0, the flow of the refrigerant is increased;

[0024] When the current superheat is equal to 0 and the compensation superheat is equal to 0, the flow of the refrigerant is reduced;

[0025] When the current superheat is equal to 0 and the compensation superheat is greater than 0, the current flow of the refrigerant is maintained.

[0026] The utility model also provides a superheat control device for implementing the superheat control method of any one of the above, comprising:

[0027] The acquisition module is suitable for acquiring the current pressure and the current temperature at the evaporator outlet, and the compensated temperature of the refrigerant after temperature compensation.

[0028] The processing module is 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.

[0029] The control module is suitable for controlling the flow 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.

[0030] According to the superheat control device provided by the utility model, the processing module comprises:

[0031] The first processing unit is suitable for determining the current superheat of the refrigerant according to the current pressure, the current temperature, and the corresponding relationship between the refrigerant pressure and the saturation temperature.

[0032] The second processing unit is suitable for determining the compensated superheat of the refrigerant according to the current pressure, the compensated temperature, and the corresponding relationship between the refrigerant pressure and the saturation temperature.

[0033] According to the superheat control device provided by the utility model, the control module comprises:

[0034] The first control unit is suitable for increasing the flow of the refrigerant when the current superheat is greater than 0 and the compensated superheat is greater than 0.

[0035] The second control unit is suitable for reducing the flow of the refrigerant when the current superheat is equal to 0 and the compensated superheat is equal to 0.

[0036] The third control unit is suitable for maintaining the current flow of the refrigerant when the current superheat is equal to 0 and the compensated superheat is greater than 0.

[0037] The utility model also provides a refrigeration equipment, comprising the refrigeration system of any one of the above and the superheat control device of any one of the above.

[0038] The utility model also provides an electronic equipment, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that the processor executes the program to implement the superheat control method of any one of the above.

[0039] The utility model also provides a kind of non-transient computer readable storage medium, computer program is stored on it, it is characterized in that, the computer program is implemented when the processor executes the overheating degree control method of any one described above.

[0040] The utility model also provides a kind of computer program product, including computer program, it is characterized in that, the computer program is implemented when the processor executes the overheating degree control method of any one described above.

[0041] The overheating degree control device, the refrigeration system and the equipment provided by the utility model increase the flow of refrigerant when the current overheating degree is greater than 0 and the compensation overheating degree is greater than 0, thereby reducing the overheating degree of refrigerant and improving the energy-saving effect of the refrigeration system; when the current overheating degree is equal to 0 and the compensation overheating degree is equal to 0, the flow of refrigerant is reduced to ensure complete vaporization of refrigerant and avoid liquid refrigerant from entering the compressor to cause liquid knock phenomenon; when the current overheating degree is equal to 0 and the compensation overheating degree is greater than 0, the overheating degree of refrigerant at the outlet of the evaporator is basically maintained at about 0 ℃ at this time, and by maintaining the current flow of refrigerant, the refrigerant entering the compressor can be ensured to be completely in gaseous state to avoid liquid knock phenomenon, and the refrigeration system can also be operated under low overheating degree condition to effectively improve the energy-saving effect of the refrigeration system. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical scheme of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0043] Figure 1 It is the structural schematic diagram of the refrigeration system provided by the embodiment of the utility model.

[0044] Figure 2 It is the flow schematic diagram of the overheating degree control method provided by the embodiment of the utility model.

[0045] Figure 3 It is the structural schematic diagram of the overheating degree control device provided by the utility model.

[0046] Figure 4 It is the structural schematic diagram of the electronic equipment provided by the utility model.

[0047] REFERENCE SIGNS:

[0048] 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

[0049] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0050] In order to better understand the superheat control device, the refrigeration system and the equipment provided by the embodiments of the present application, the application background thereof will be introduced first. The refrigeration system is widely used in air conditioning, freezing and refrigeration, industrial cooling and other fields. The superheat refers to the difference between the actual temperature at the outlet of the evaporator and the saturation temperature corresponding to the pressure at the point, which is an important parameter in the refrigeration system.

[0051] The existence of superheat is crucial to ensure the stable operation of the refrigeration system. By controlling the superheat, the liquid form of refrigerant can be prevented from entering the compressor, reducing the risk of equipment damage caused by liquid strike phenomenon. At the same time, maintaining appropriate superheat can maximize the heat exchange efficiency of the evaporator, thereby improving the energy efficiency ratio of the entire system.

[0052] Since the temperature and pressure of the refrigerant do not change when it undergoes phase change, it can only be confirmed to enter the superheat state when the temperature of the refrigerant exceeds its saturation temperature. Therefore, in the related art, the gaseous refrigerant at the outlet of the dry evaporator commonly used in the refrigeration system has a superheat of about 5-10℃.

[0053] In theory, reducing the superheat appropriately can reduce the power consumption of the compressor and the heat load of the condenser, and increase 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 converted from liquid state to gaseous state, and the temperature is equal to the saturation temperature under the current pressure, the energy saving effect of the refrigeration system reaches the best. However, since the superheat is generally measured by the pressure sensor and the temperature sensor connected to the outlet of the evaporator, and the temperature and the pressure of the refrigerant do not change when the refrigerant is in the two-phase region, when the temperature sensor measures the superheat equal to 0, the refrigerant may be in the two-phase coexistence state. Therefore, the state that the superheat is exactly equal to 0 is difficult to measure by using the existing means, which leads to great difficulty in controlling the superheat of the refrigeration system, and it is difficult to further reduce the superheat.

[0054] Therefore, how to further reduce the superheat under the premise of maintaining the stable operation of the system and improve the energy saving effect of the refrigeration system has become an important problem to be solved at present.

[0055] Based on the above problems, the utility model embodiment provides a superheat control device, a refrigeration system and equipment, which can make the refrigeration system operate under a lower superheat condition and effectively improve the energy saving effect of the refrigeration system.

[0056] The utility model discloses a superheat control device, a refrigeration system and equipment. Figures 1-4 The utility model discloses a superheat control device, a refrigeration system and equipment.

[0057] Referring to Figure 1 A refrigeration system, comprising an evaporator 110, a control valve 120, a first detection module, a heater 150 and a second detection module. The evaporator 110 is a key component in the refrigeration system, mainly absorbing heat through the evaporation of refrigerant to achieve refrigeration effect. One side of the evaporator 110 is provided with an inlet for liquid refrigerant to enter, and the other side is provided with an outlet for gaseous refrigerant after heat absorption to discharge. The control valve 120 is connected to the inlet of the evaporator 110 and is suitable for controlling the liquid supply 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 flow direction of the refrigerant and is suitable for heating the refrigerant. The second detection module is connected downstream of the heater 150 along the flow direction of the refrigerant and is suitable for detecting the temperature of the heated refrigerant.

[0058] In practical application, the low-temperature liquid refrigerant enters the evaporator 110 through the inlet, the evaporator 110 absorbs heat through evaporation of the refrigerant to achieve the refrigeration effect, and the refrigerant after heat absorption is discharged through the outlet of the evaporator 110. The current pressure and current temperature of the refrigerant at the outlet of the evaporator 110 can be detected by the first detection module. According to the measured current pressure, current temperature, and the corresponding relationship between the refrigerant pressure and the saturation temperature, the current superheat degree of the refrigerant can be obtained. The heater 150 can heat the refrigerant, and the compensation temperature of the heated refrigerant can be detected by the second detection module. According to the measured current pressure, compensation temperature, and the corresponding relationship between the refrigerant pressure and the saturation temperature, the compensation superheat degree of the heated refrigerant can be obtained. According to the current superheat degree and the compensation superheat degree, the opening degree of the control valve 120 is adjusted, so that the refrigeration system can operate under a lower superheat degree condition. The specific principle is as follows:

[0059] When the current superheat degree is greater than 0 and the compensation superheat degree is greater than 0, it indicates that the refrigerant has completely evaporated into a gaseous state, and the superheat degree of the refrigerant is greater than 0. In this condition, it can ensure that the refrigerant entering the compressor is completely gaseous to avoid the liquid strike phenomenon, but the higher superheat degree will affect the energy saving effect of the refrigeration system.

[0060] When the current superheat degree is equal to 0 and the compensation superheat degree is greater than 0, it indicates that the refrigerant has basically completely evaporated into a gaseous state or has just completely evaporated into a gaseous state. Only a small temperature compensation provided by the heater 150 is needed to make the superheat degree of the refrigerant greater than 0. At this time, the superheat degree of the refrigerant at the outlet of the evaporator 110 is basically maintained at about 0℃. In this condition, it can not only ensure that the refrigerant entering the compressor is completely gaseous to avoid the liquid strike 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.

[0061] When the current superheat degree is equal to 0 and the compensation superheat degree is equal to 0, it indicates that the refrigerant is in a two-phase state. Even if there is a temperature compensation provided by the heater 150, the refrigerant still cannot completely evaporate into a gaseous state. In this condition, the liquid refrigerant will enter the compressor to cause the liquid strike phenomenon and damage the equipment.

[0062] Based on the above principle, when the current superheat is greater than 0 and the compensation superheat is greater than 0, the flow of the refrigerant is increased, so as 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 compensation superheat is equal to 0, the flow of the refrigerant is reduced, so as to ensure that the refrigerant is completely gasified and avoid the liquid refrigerant from entering the compressor to cause the liquid knock phenomenon; when the current superheat is equal to 0 and the compensation superheat is greater than 0, the superheat of the refrigerant at the outlet of the evaporator 110 is basically maintained at about 0℃, and by maintaining the current flow of the refrigerant, the refrigerant entering the compressor can be ensured to be in a gaseous state, the liquid knock phenomenon is avoided, and the refrigeration system can be operated under a low superheat condition, so that the energy saving effect of the refrigeration system is effectively improved.

[0063] It can be understood that, as a key component in the refrigeration system, the evaporator 110 mainly absorbs heat through 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 also be different. Common evaporators 110 include finned tube evaporators, spiral tube evaporators, plate evaporators and the like. The specific structures of different types of evaporators 110 can be referred to the prior art, and will not be described in detail in the embodiments of the present application. In addition, the specific type of the evaporator 110 can be selected according to actual requirements, and the embodiments of the present application do not make specific limitations.

[0064] In an optional embodiment, the control valve 120 can be an electronic expansion valve. The electronic expansion valve can steplessly adjust the opening degree of the valve through the electrical signals fed back by the first detection module and the second detection module, so as to accurately control the flow of the refrigerant.

[0065] It should be pointed out that the specific structure of the electronic expansion valve can be referred to the prior art, and will not be described in detail in the embodiments of the present application.

[0066] In an optional embodiment of the present application, the first detection module includes a pressure sensor 130 connected to the outlet of the evaporator 110 and a first temperature sensor 140. The current pressure of the refrigerant at the outlet of the evaporator 110 can be detected by the pressure sensor 130, and the saturation temperature of the refrigerant under the current pressure can be determined according to the mapping relationship between the pressure of the refrigerant and the saturation temperature. The current temperature of the refrigerant at the outlet of the evaporator 110 can be detected by the first temperature sensor 140, and the current superheat of the refrigerant can be obtained by subtracting the current temperature of the refrigerant from the saturation temperature of the refrigerant under the current pressure.

[0067] In an embodiment of the present application, the first temperature sensor 140 is located downstream of the pressure sensor 130 in the flow direction of the refrigerant, so as to ensure the accuracy and stability of the temperature and pressure measurement.

[0068] In an optional embodiment of the utility model, the second detection module comprises a second temperature sensor 160, and the compensation temperature of the heated refrigerant can be detected through the second temperature sensor 160; and the compensation superheat of the heated refrigerant can be obtained by subtracting the compensation temperature of the refrigerant from the saturation temperature of the refrigerant under the current pressure.

[0069] It should be noted that, in the embodiment of the utility model, 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 determined, so as to better determine the working condition in which the superheat is 0 or close to 0; in other words, the temperature compensation of the refrigerant by the heater 150 is very small, and the influence on the pressure of the refrigerant can be basically ignored, so that the superheat of the heated refrigerant can be determined by the current pressure measured by the pressure sensor 130 and the compensation temperature measured by the second temperature sensor 160. 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 embodiment of the utility model.

[0070] It can be understood that, according to different working principles, the pressure sensor 130 and the temperature sensor can have multiple optional types, which can be selected according to actual needs, and the specific structure of each type of pressure sensor 130 and temperature sensor can refer to the prior art, which is not described in detail in the embodiment of the utility model.

[0071] In another optional embodiment of the utility model, the first detection module and / or the second detection module can also use an integrated temperature and pressure sensor, so as to realize simultaneous measurement of temperature and pressure.

[0072] In an embodiment of the utility model, the heater 150 can use an electric heater, which can provide temperature compensation for the refrigerant and increase an additional small superheat, but without completely gasifying the refrigerant which is not completely gasified. The heating power of the heater 150 can be configured according to actual needs, but it is necessary to ensure that the compensation superheat can be measured by the second temperature sensor 160, so as to regulate and control the control valve 120 according to the current superheat and the compensation superheat. The specific value or threshold of the compensation superheat can be set according to actual needs, which is not limited in the embodiment of the utility model.

[0073] The superheat control method provided by the utility model will be described below, and the superheat control method described below can be correspondingly referred to the refrigeration system described above.

[0074] Reference Figure 2A superheat degree control method is provided for the refrigeration system of any of the above embodiments, and the method comprises the following steps:

[0075] In step S10, the current pressure and the current temperature at the outlet of the evaporator 110 are obtained.

[0076] 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 obtaining the temperature value measured by the first detection module.

[0077] In step S20, the current superheat degree is determined according to the current pressure and the current temperature.

[0078] Specifically, according to the mapping relationship between the pressure of the refrigerant and the saturation temperature, the saturation temperature of the refrigerant under the current pressure can be determined, and the current superheat degree of the refrigerant can be obtained by subtracting the current temperature from the saturation temperature of the refrigerant under the current pressure.

[0079] In step S30, temperature compensation is provided for the refrigerant, and the compensation temperature of the refrigerant after the temperature compensation is obtained.

[0080] Specifically, the heater 150 is used to provide temperature compensation for the refrigerant, thereby increasing an additional small superheat degree, but it is necessary to ensure that the compensation temperature can be collected by the temperature detection element such as the temperature sensor, and the compensation temperature of the refrigerant after the temperature compensation can be determined by obtaining the temperature value measured by the second detection module.

[0081] In step S40, the compensation superheat degree is determined according to the current pressure and the compensation temperature.

[0082] Specifically, according to the mapping relationship between the pressure of the refrigerant and the saturation temperature, the saturation temperature of the refrigerant under the current pressure can be determined, and the current superheat degree of the refrigerant can be obtained by subtracting the compensation temperature from the saturation temperature of the refrigerant under the current pressure.

[0083] It should be noted here that the temperature compensation of the heater 150 for the refrigerant is very small, and the influence on the pressure of the refrigerant can be basically ignored, so 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 degree of the refrigerant after the heating.

[0084] In step S50, the flow rate of the refrigerant is controlled according to the current superheat degree and the compensation superheat degree, so that the current superheat degree is equal to 0 and the compensation superheat degree is greater than 0.

[0085] Specifically, in actual operation, the refrigeration system has the following working conditions:

[0086] 1) When the current superheat is greater than 0 and the compensated superheat is greater than 0, it indicates that the refrigerant has completely evaporated into a gaseous state 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 gaseous, avoiding the liquid strike phenomenon, but the higher superheat will affect the energy saving effect of the refrigeration system.

[0087] 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 gaseous state or just completely evaporated into a gaseous state. Only a small temperature compensation provided by the heater 150 is needed 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℃. In this working condition, it can not only ensure that the refrigerant entering the compressor is completely gaseous, avoiding the liquid strike phenomenon, but also enable the refrigeration system to run at a lower superheat condition, effectively improving the energy saving effect of the refrigeration system.

[0088] 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. Even if the temperature compensation provided by the heater 150, the refrigerant still cannot completely evaporate into a gaseous state. In this working condition, the liquid refrigerant will enter the compressor to cause the liquid strike phenomenon, causing damage to the equipment.

[0089] Therefore, according to the current superheat and the compensated superheat, the flow of the refrigerant is controlled so that the current superheat is equal to 0 and the compensated superheat is greater than 0. At this time, it can not only ensure that the refrigerant entering the compressor is completely gaseous, avoiding the liquid strike phenomenon, but also enable the refrigeration system to run at a lower superheat condition, effectively improving the energy saving effect of the refrigeration system.

[0090] In an embodiment of the utility model, the control valve 120 is adjusted by the following steps:

[0091] Step S500, when the current superheat is greater than 0 and the compensated superheat is greater than 0, the flow of the refrigerant is increased.

[0092] Specifically, when the current superheat is greater than 0 and the compensated superheat is greater than 0, it indicates that the refrigerant has completely evaporated into a gaseous state at this time, and there is a certain superheat. The flow of the refrigerant is increased by increasing the opening of the control valve 120, so as to reduce the superheat and improve the energy saving effect of the refrigeration system.

[0093] Step S510, when the current superheat is equal to 0 and the compensated superheat is equal to 0, the flow of the refrigerant is reduced.

[0094] Specifically, when the current superheat is equal to 0 and the compensated superheat is equal to 0, it indicates that the refrigerant is in a gas-liquid coexisting state. The flow of the refrigerant is reduced by reducing the opening of the control valve 120, so as to increase the superheat, ensure that the refrigerant completely evaporates into a gaseous state, and prevent the liquid refrigerant from entering the compressor to cause the liquid strike phenomenon.

[0095] When the current superheat degree is equal to 0 and the compensation superheat degree is greater than 0, the current flow of the refrigerant is maintained.

[0096] Specifically, when the current superheat degree is equal to 0 and the compensation superheat degree is greater than 0, it indicates that the refrigerant is substantially completely evaporated into a gaseous state or is just completely evaporated into a gaseous state, and the current superheat degree at the outlet of the evaporator 110 is maintained at about 0℃, so that the optimal working state is achieved. By maintaining the current flow of the refrigerant, it can not only ensure that the refrigerant entering the compressor is completely in a gaseous state to avoid the liquid strike phenomenon, but also enable the refrigeration system to operate at a lower superheat degree condition, thereby effectively improving the energy-saving effect of the refrigeration system.

[0097] Specifically, the flow of the refrigerant can be dynamically adjusted based on a 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℃ and the compensation superheat degree at a value greater than 0 or within a certain threshold range.

[0098] In another aspect, referring to Figure 3 The utility model also provides a superheat degree control device for implementing the superheat degree control method provided by any of the above embodiments, comprising an acquisition module 210, a processing module 220 and a control module 230; wherein the acquisition module 210 is suitable for acquiring the current pressure and current temperature at the outlet of the evaporator 110, and the compensation temperature of the refrigerant after temperature compensation; the processing module 220 is suitable for determining the current superheat degree according to the current pressure and current temperature, and determining the compensation superheat degree according to the current pressure and compensation temperature; and the control module 230 is suitable for controlling the flow of the refrigerant according to the current superheat degree and the compensation superheat degree, so that the current superheat degree is equal to 0 and the compensation superheat degree is greater than 0.

[0099] In an optional embodiment of the utility model, the processing module 220 comprises a first processing unit and a second processing unit, the first processing unit is used for determining the current superheat degree of the refrigerant according to the current pressure, current temperature and the mapping relationship between the refrigerant pressure and the saturation temperature; and the second processing unit is used for determining the compensation superheat degree of the refrigerant according to the current pressure, compensation temperature and the mapping relationship between the refrigerant pressure and the saturation temperature.

[0100] In an optional embodiment of the utility model, the control module 230 comprises a first control unit, a second control unit and a third control unit. The first control unit is suitable for increasing the flow of the refrigerant when the current superheat degree is greater than 0 and the compensation superheat degree is greater than 0; the second control unit is suitable for reducing the flow of the refrigerant when the current superheat degree is equal to 0 and the compensation superheat degree is equal to 0; and the third control unit is suitable for maintaining the current flow of the refrigerant when the current superheat degree is equal to 0 and the compensation superheat degree is greater than 0.

[0101] It can be understood that the different embodiments or examples described in the specification and the features of the different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0102] In another aspect, the utility model still provides a refrigeration equipment, including the refrigeration system provided by any one of the above embodiments and the superheat control device provided by any one of the above embodiments.

[0103] In another aspect, the utility model still provides an electronic equipment, Figure 4 An example of an electronic device entity structure diagram is shown as Figure 4 As shown, the electronic device can include: processor (processor) 310, communications interface (communications interface) 320, memory (memory) 330 and communication bus 340, wherein the processor 310, the communications interface 320, the memory 330 complete the communication between each other through the communication bus 340.Processor 310 can call the logic instruction in memory 330, to execute the superheat control method, the method includes: obtaining the current pressure and current temperature at the outlet of the evaporator 110;According to the saturation temperature corresponding to the current pressure and the current temperature, determine the current superheat of the refrigerant;Temperature compensation is provided to the refrigerant, and the compensation temperature of the refrigerant after temperature compensation is obtained;According to the saturation temperature corresponding to the current pressure and the compensation temperature, determine the compensation superheat;According to the current superheat and the compensation superheat control refrigerant flow, make the current superheat equal to 0, the compensation superheat is greater than 0.

[0104] In addition, the logic instruction in the memory 330 described above can be realized in the form of a software function unit and sold or used as an independent product, which can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the utility model can essentially or say the part that contributes to the prior art or part of the technical solutions can be embodied in the form of a software product, which is stored in a storage medium, including a plurality of instructions for causing a computer device (which can be a personal computer, server or network device) to execute all or part of the steps of the method described in various embodiments of the utility model. The foregoing storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and various program code storage media.

[0105] In another aspect, the utility model provides a kind of computer program product, the computer program product includes computer program, computer program can be stored on non-transient computer readable storage medium, when the computer program is executed by processor, computer can execute the superheat control method provided by each method described above, the method includes: obtaining the current pressure and current temperature at the outlet of the evaporator 110;According to the saturation temperature corresponding to the current pressure and the current temperature, determine the current superheat of refrigerant;Temperature compensation is provided to refrigerant, and the compensation temperature of the refrigerant after temperature compensation is obtained;According to the saturation temperature corresponding to the current pressure and the compensation temperature, determine compensation superheat;According to the current superheat and the compensation superheat control refrigerant flow, make the current superheat equal to 0, and the compensation superheat is greater than 0.

[0106] In another aspect, the utility model provides a kind of non-transient computer readable storage medium, which stores a computer program, the computer program is executed by processor to implement the superheat control method provided by each method described above, the method includes: obtaining the current pressure and current temperature at the outlet of the evaporator 110;According to the saturation temperature corresponding to the current pressure and the current temperature, determine the current superheat of refrigerant;Temperature compensation is provided to refrigerant, and the compensation temperature of the refrigerant after temperature compensation is obtained;According to the saturation temperature corresponding to the current pressure and the compensation temperature, determine compensation superheat;According to the current superheat and the compensation superheat control refrigerant flow, make the current superheat equal to 0, and the compensation superheat is greater than 0.

[0107] The device embodiments described above are only schematic, wherein the units illustrated as separate components can or can not be physically separate, and the components illustrated as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment. Those skilled in the art can understand and implement without creative labor.

[0108] From the above description of the embodiments, those skilled in the art can clearly understand that the embodiments can be realized by software and necessary general hardware platforms, and of course can also be realized by hardware. Based on such understanding, the above technical solutions essentially or say the part of the prior art that contributes to the technical solutions can be embodied in the form of software products, which can be stored in a computer readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including a plurality of instructions to make a computer device (which can be a personal computer, server, or network device, etc.) execute the method described in each embodiment or some part of the embodiment.

[0109] Finally, it should be noted that the above examples are intended to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced by equivalents; 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 application.

Claims

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

2. The refrigeration system according to claim 1, characterized in that, The first detection module includes 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 2, characterized in that, The first temperature sensor (140) is located downstream of the pressure sensor (130) along the refrigerant flow direction.

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

5. The refrigeration system according to claim 1, characterized in that, The control valve (120) includes an electronic expansion valve.

6. A superheat control device, characterized in that, Suitable for the refrigeration system as described in any one of claims 1-5, comprising: The acquisition module (210) is adapted to acquire the current pressure and current temperature at the outlet of the evaporator (110), as well as the compensated temperature of the refrigerant after temperature compensation; The processing module (220) is adapted to determine the current superheat based on the current pressure and the current temperature, and to determine the compensated superheat based on 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) includes: The first processing unit is adapted to determine the current superheat of the refrigerant based on the current pressure, the current temperature, and the correspondence between the refrigerant pressure and the saturation temperature. The second processing unit is adapted to determine the compensated superheat of the refrigerant based on the current pressure, the compensated temperature, and the correspondence between the refrigerant pressure and the saturation temperature.

8. The superheat control device according to claim 6, characterized in that, The control module (230) includes: The first control unit is 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 includes the refrigeration system as described in any one of claims 1-5 and the superheat control device as described in any one of claims 6-8.

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