Refrigeration system and control method, device, storage medium and program product thereof

Abstract

The application discloses a kind of control method, device, refrigeration system of refrigeration system, storage medium and computer program product, the import of refrigeration system and condenser cold side import are also connected by first valve, the outlet of secondary heat exchanger and regenerator cold side are also connected by second valve;The method comprises: according to the first pressure difference of water separator outlet temperature and regenerator hot side and cold side, whether regenerator hot side and condenser hot side can freeze is judged, if it is determined that it can freeze, then according to the temperature at the outlet of water separator and the first pressure difference, the opening and closing of first valve and second valve are controlled respectively;Also according to the second pressure difference of condenser cold side import and export, whether condenser cold side appears freezing is judged, if it is determined that freezing appears, then according to the second pressure difference, the opening of first valve is controlled.The scheme, by judging whether it can freeze or has frozen, control valve opening and closing to prevent icing and deicing, avoid the appearance of ice block, ensure system stable operation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of refrigeration systems, and particularly relates to a control method and device of a refrigeration system, the refrigeration system, a storage medium and a computer program product. BACKGROUND

[0002] In an air cycle refrigeration system, if icing occurs, the stability of operation will be affected, and serious risks will be brought to the system. The positions where icing occurs are mainly the turbine outlet and the cold side of the condenser, and the hot side of the regenerator and the hot side of the condenser. Specifically, one of the methods to improve the refrigeration capacity is to remove the water vapor of the air before the air is supplied into the turbine. The related scheme adopts a high-pressure water removal method, although the efficiency of the high-pressure water removal is generally about 90%, but the absolute humidity content entering the turbine in the system is still higher than the system design point, causing the turbine outlet and the condenser to appear icing, which is easy to cause ice blockage between the turbine outlet and the condenser. In addition, in some extreme cases, when the turbine outlet temperature is low, the wet air temperature of the hot side of the regenerator and the hot side of the condenser is too low, and the phenomenon of hot side icing occurs.

[0003] The above content is only used to assist in understanding the technical solutions of the present application, and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0004] The purpose of the present application is to provide a control method and device of a refrigeration system, the refrigeration system, a storage medium and a computer program product, so as to solve the problem that the air cycle refrigeration system in the related scheme occurs icing and reduces the stability of system operation, to achieve the effect of controlling the opening and closing and the opening degree of the valve for anti-icing and de-icing, preventing ice blockage, and ensuring stable operation of the system, by judging whether icing is possible or has occurred according to the outlet temperature of the water separator, the pressure difference of the hot side and the cold side of the regenerator, and the pressure difference of the inlet and outlet of the cold side of the condenser.

[0005] The present invention provides a control method for a refrigeration system, wherein the inlet pipeline of the refrigeration system passes through a first heat exchanger, a compressor, a second heat exchanger, a hot side of a regenerator, a hot side of a condenser, a water separator, a cold side of a regenerator, a cooling turbine, and a cold side of a condenser in sequence, and is connected to the outlet pipeline of the refrigeration system; the inlet pipeline is further connected to the pipeline between the cooling turbine and the cold side of the condenser through a first valve; the pipeline between the second heat exchanger and the hot side of the regenerator is further connected to the pipeline between the water separator and the cold side of the regenerator through a second valve; the method comprises: during the operation of the refrigeration system, obtaining the temperature at the outlet of the water separator; obtaining the temperature of the regenerator The pressure difference between the hot side of the heat exchanger and the cold side of the regenerator is recorded as a first pressure difference; the inlet and outlet pressure difference of the cold side of the condenser is obtained, which is recorded as a second pressure difference; whether the hot side of the regenerator and the hot side of the condenser may be frozen is determined according to the temperature at the outlet of the water separator and the first pressure difference; if it is determined that the hot side of the regenerator and the hot side of the condenser may be frozen, the opening and closing of the first valve and the second valve are controlled respectively according to the temperature at the outlet of the water separator and the first pressure difference; and / or, whether the cold side of the condenser is frozen is determined according to the second pressure difference; if it is determined that the cold side of the condenser is frozen, the opening of the first valve is controlled according to the second pressure difference.

[0006] In some embodiments, determining whether the hot side of the regenerator and the hot side of the condenser may be frozen is determined based on the temperature at the water separator outlet and the first pressure difference, including: judging whether the temperature at the water separator outlet is lower than the preset first temperature, and whether the first pressure difference is greater than or equal to the preset first pressure difference; if the temperature at the water separator outlet is lower than the preset first temperature, and / or, if the first pressure difference is greater than or equal to the preset first pressure difference, determining that the hot side of the regenerator and the hot side of the condenser may be frozen; and / or, judging whether freezing occurs in the refrigeration system based on the second pressure difference, including: judging whether the second pressure difference is greater than the preset second pressure difference; if the second pressure difference is greater than the preset second pressure difference, determining that freezing occurs on the cold side of the condenser.

[0007] In some embodiments, the opening and closing of the first valve and the second valve are controlled respectively according to the temperature at the water separator outlet and the first pressure difference, including: opening the first valve; judging the magnitude of the temperature at the water separator outlet; if the temperature at the water separator outlet is lower than a preset second temperature, keeping the first valve open; if the temperature at the water separator outlet is greater than or equal to the preset second temperature and lower than a preset third temperature, closing the first valve; the preset second temperature ≤ the preset third temperature.

[0008] In some embodiments, the refrigeration system is provided with a rotor assembly; the rotor assembly is used to control air circulation; the control method further comprises: if the temperature at the water separator outlet is greater than or equal to a preset third temperature, or the rotation speed of the rotor assembly is less than a preset minimum rotation speed, the refrigeration system is controlled to stop running.

[0009] In some embodiments, the opening and closing of the first valve and the second valve are respectively controlled according to the temperature at the water separator outlet and the first pressure difference, which further comprises: opening the second valve; determining the size of the first pressure difference; if the first pressure difference is greater than or equal to a preset first pressure difference, keeping the second valve open; if the first pressure difference is less than a preset third pressure difference, closing the second valve; the preset first pressure difference is greater than or equal to the preset third pressure difference.

[0010] In some embodiments, the opening degree of the first valve is controlled according to the second pressure difference, which comprises: opening the first valve; determining the size of the second pressure difference; if the second pressure difference is greater than a preset second pressure difference, controlling the first valve to increase the opening degree at a first speed; the first speed is in a proportional relationship with the second pressure difference; if the second pressure difference is less than a preset fourth pressure difference, closing the first valve; the preset second pressure difference is greater than or equal to the preset fourth pressure difference.

[0011] According to the method, the application provides a control device for a refrigeration system. The inlet pipeline of the refrigeration system sequentially passes through a first heat exchanger, a compressor, a second heat exchanger, a hot side of a regenerator, a hot side of a condenser, a water separator, a cold side of the regenerator, a cooling turbine and a cold side of the condenser, and is connected to an outlet pipeline of the refrigeration system. The inlet pipeline is also connected to a pipeline between the cooling turbine and the cold side of the condenser through a first valve. A pipeline between the second heat exchanger and the hot side of the regenerator is connected to a pipeline between the water separator and the cold side of the regenerator through a second valve. The control device comprises: an acquisition unit configured to acquire a temperature at an outlet of the water separator during operation of the refrigeration system; acquire a pressure difference between the hot side of the regenerator and the cold side of the regenerator, denoted as a first pressure difference; and acquire an inlet-outlet pressure difference of the cold side of the condenser, denoted as a second pressure difference. A control unit is configured to determine whether the hot side of the regenerator and the hot side of the condenser are likely to freeze according to the temperature at the outlet of the water separator and the first pressure difference. The control unit is configured to control opening and closing of the first valve and the second valve according to the temperature at the outlet of the water separator and the first pressure difference, respectively, if it is determined that the hot side of the regenerator and the hot side of the condenser are likely to freeze. And / or, the control unit is configured to determine whether the cold side of the condenser is frozen according to the second pressure difference. The control unit is configured to control the opening degree of the first valve according to the second pressure difference if it is determined that the cold side of the condenser is frozen.

[0012] In some embodiments, the control unit determines whether the hot side of the regenerator and the hot side of the condenser are likely to freeze according to the temperature at the outlet of the water separator and the first pressure difference, comprising: determining whether the temperature at the outlet of the water separator is less than a preset first temperature and whether the first pressure difference is greater than or equal to a preset first pressure difference; and determining that the hot side of the regenerator and the hot side of the condenser are likely to freeze if the temperature at the outlet of the water separator is less than the preset first temperature and / or if the first pressure difference is greater than or equal to the preset first pressure difference. And / or, the control unit determines whether the refrigeration system is frozen according to the second pressure difference, comprising: determining whether the second pressure difference is greater than a preset second pressure difference; and determining that the cold side of the condenser is frozen if the second pressure difference is greater than the preset second pressure difference.

[0013] In some embodiments, the control unit controls opening and closing of the first valve and the second valve according to the temperature at the water separator outlet and the first pressure difference, respectively, including: opening the first valve; determining the temperature at the water separator outlet; if the temperature at the water separator outlet is less than a preset second temperature, keeping the first valve open; if the temperature at the water separator outlet is greater than or equal to the preset second temperature and less than a preset third temperature, closing the first valve; the preset second temperature ≤ the preset third temperature.

[0014] In some embodiments, the refrigeration system is provided with a rotor assembly for controlling air circulation; the control unit is further configured to: if the temperature at the water separator outlet is greater than or equal to the preset third temperature, or the rotation speed of the rotor assembly is less than a preset minimum rotation speed, controlling the refrigeration system to stop running.

[0015] In some embodiments, the control unit controls opening and closing of the first valve and the second valve according to the temperature at the water separator outlet and the first pressure difference, respectively, further including: opening the second valve; determining the first pressure difference; if the first pressure difference is greater than or equal to a preset first pressure difference, keeping the second valve open; if the first pressure difference is less than a preset third pressure difference, closing the second valve; the preset first pressure difference ≥ the preset third pressure difference.

[0016] In some embodiments, the control unit controls the opening degree of the first valve according to the second pressure difference, including: opening the first valve; determining the second pressure difference; if the second pressure difference is greater than a preset second pressure difference, controlling the first valve to increase the opening degree at a first speed; the first speed is in a proportional relationship with the second pressure difference; if the second pressure difference is less than a preset fourth pressure difference, closing the first valve; the preset second pressure difference ≥ the preset fourth pressure difference.

[0017] In another aspect, the present application provides a refrigeration system matched with the above device, including the control device of the refrigeration system.

[0018] In another aspect, the present application provides a storage medium matched with the above method, including a stored program, wherein the device where the storage medium is located executes the control method of the refrigeration system when the program runs.

[0019] In another aspect, the present application provides a computer program product matched with the above method, including a computer program, which realizes the steps of the control method of the refrigeration system when the computer program product is processed and executed.

[0020] The scheme of the present application is that, in the air circulation refrigeration system, the inlet pipeline is connected with the cold side inlet pipeline of the condenser through a first valve, and the outlet pipeline of the second heat exchanger is connected with the cold side pipeline of the regenerator through a second valve; when the system is running, whether the hot side of the regenerator and the hot side of the condenser can be frozen is determined according to the temperature at the outlet of the water separator and the first pressure difference; if it is determined that the hot side of the regenerator and the hot side of the condenser can be frozen, the opening and closing of the first valve and the second valve are controlled according to the temperature at the outlet of the water separator and the first pressure difference respectively; and whether the cold side of the condenser is frozen is determined according to the second pressure difference; if it is determined that the cold side of the condenser is frozen, the opening degree of the first valve is controlled according to the second pressure difference. Thus, whether it can be frozen or has been frozen is determined according to the temperature at the outlet of the water separator, the pressure difference of the hot side and the cold side of the regenerator, and the pressure difference between the inlet and outlet of the cold side of the condenser, so as to control the opening and closing and the opening degree of the valve to remove ice, prevent ice blockage, and ensure stable operation of the system.

[0021] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the present application.

[0022] The technical scheme of the present application will be further described in detail below with reference to the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The flowchart of an embodiment of the control method of the refrigeration system of the present application;

[0024] Figure 2 The structural schematic diagram of an embodiment of the control device of the refrigeration system of the present application;

[0025] Figure 3 The system structural schematic diagram of the air circulation refrigeration system of the present application;

[0026] Figure 4 The flowchart of the control method of the air circulation refrigeration system of the present application for preventing freezing and removing ice.

[0027] In combination with the drawings, the reference signs in the embodiments of the present application are as follows:

[0028] 1 - first heat exchanger; 2 - compressor; 3 - second heat exchanger; 4 - regenerator; 5 - condenser; 6 - water separator; 7 - cooling turbine; 8 - temperature control valve; 9 - pressure sensor; 10 - pressure difference sensor; 11 - temperature and humidity sensor; 12 - fan; 13 - pressure relief valve; 14 - water outlet temperature sensor; 15 - controller; 102 - acquisition unit; 104 - control unit. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described below in connection with the specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0030] To effectively ensure the reliable operation of the air cycle refrigeration system, when the pressure drop between the turbine outlet and the condenser outlet reaches a certain value, the hot bypass deicing needs to be started. In addition, in some extreme cases, the turbine outlet temperature is low, which makes the hot side wet air temperature of the regenerator condenser too low (below 0℃), and the abnormal phenomenon of hot side icing occurs, which leads to rapid rise of system operating pressure, makes the air cycle deviate from the designed operating range, and the unit operation is unstable, and the stall occurs, which brings serious risk to the unit operation.

[0031] Therefore, the present application provides a control method for anti-icing and deicing of an air cycle refrigeration system, which judges whether the hot side of the regenerator condenser is likely to ice according to the outlet temperature of the water separator and the pressure difference of the hot side of the regenerator, controls the valve and pressure relief valve for anti-icing when icing is likely, and judges whether the cold side of the condenser is iced according to the pressure difference between the inlet and outlet of the cold side of the condenser, and deices through the control valve when icing, so as to ensure stable operation of the refrigeration system.

[0032] According to the embodiments of the present application, a control method of a refrigeration system is provided, the inlet pipeline of the refrigeration system sequentially passes through a first heat exchanger, a compressor, a second heat exchanger, a hot side of a regenerator, a hot side of a condenser, a water separator, a cold side of the regenerator, a cooling turbine, and a cold side of the condenser, and is connected to an outlet pipeline of the refrigeration system; the inlet pipeline is also connected to a pipeline between the cooling turbine and the cold side of the condenser through a first valve; and a pipeline between the second heat exchanger and the hot side of the regenerator is also connected to a pipeline between the water separator and the cold side of the regenerator through a second valve.

[0033] The refrigeration system is an air cycle refrigeration system, and air circulates in the refrigeration system. Figure 3The first heat exchanger is a first-stage heat exchanger 1, the second heat exchanger is a second-stage heat exchanger 3, the first valve is a temperature control valve 8, and the second valve is a pressure relief valve 13. After the high-temperature and high-pressure air source enters the refrigeration system, heat exchange is performed in the first-stage heat exchanger 1, the cooled air enters the air compressor 2 to be pressurized and heated, and then enters the second-stage heat exchanger 3 to be cooled, and then enters the hot side of the regenerator 4, and then exchanges heat with the low-temperature air on the cold side of the regenerator 4, and then exchanges heat with the air on the cold side of the condenser 5, so that the water in the air is condensed, and then most of the water is separated in the water separator 6, and the separated liquid water is sprayed into the cold side inlet of the second-stage heat exchanger 3 through a small pipe, and the other part of the air from the water separator 6 enters the cold side of the regenerator 4 to be reheated, so that the air before entering the cooling turbine 7 does not contain liquid drops. The air from the cold side of the regenerator 4 enters the cooling turbine 7 to be expanded, pressurized and cooled, and then the low-temperature air enters the cold side of the condenser 5 to be reheated, and the air temperature rises to about 0℃, and then the air is discharged from the outlet pipeline for use by the user. In the cold side of the first-stage heat exchanger 1 and the second-stage heat exchanger 3, external air is sucked in by the fan 12 to cool the heat exchanger. The pressure sensor 9 is used to monitor the outlet pressure of the system, and combined with the temperature and humidity data collected by the temperature and humidity sensor 11, the outlet humidity of the system can be calculated.

[0034] The high-temperature and high-pressure air source at the inlet pipeline also passes through the branch where the temperature control valve 8 is located and enters the cold side inlet of the condenser 5. When the temperature control valve 8 is opened, the outlet temperature of the system can be increased. The outlet pipeline of the second-stage heat exchanger 3 also passes through the pressure relief valve 13 and is connected to the cold side of the regenerator 4. When the pressure relief valve 13 is opened, part of the low-temperature air can mix with the air discharged from the water separator 6 and enter the cold side of the regenerator 4 to play a pressure relief role. The controller 15 is used to control the opening degree of the temperature control valve 8.

[0035] As shown in FIG. 1, the refrigeration system includes a high-temperature and high-pressure air source, a first-stage heat exchanger 1, an air compressor 2, a second-stage heat exchanger 3, a regenerator 4, a condenser 5, a water separator 6, a cooling turbine 7, a fan 12, a pressure sensor 9, a temperature and humidity sensor 11, a water outlet temperature sensor 14, a pressure difference sensor 10, a temperature control valve 8, a pressure relief valve 13 and a controller 15. Figure 1 As shown in FIG. 2, an embodiment of the method of the present application is shown in the flowchart. The control method of the refrigeration system can include steps S110 to S150.

[0036] At step S110, during the operation of the refrigeration system, the temperature at the outlet of the water separator is obtained; the pressure difference between the hot side of the regenerator and the cold side of the regenerator is obtained, denoted as a first pressure difference; and the pressure difference between the inlet and outlet of the cold side of the condenser is obtained, denoted as a second pressure difference.

[0037] The temperature at the outlet of the water separator is detected by the water outlet temperature sensor 14. The pressure difference between the inlet and outlet of the cold side of the regenerator is detected by the pressure difference sensor 10.

[0038] At step S120, it is determined whether the hot side of the regenerator and the hot side of the condenser are likely to freeze according to the temperature at the water separator outlet and the first pressure difference.

[0039] In some embodiments, the specific process of determining whether the hot side of the regenerator and the hot side of the condenser are likely to freeze according to the temperature at the water separator outlet and the first pressure difference at step S120 includes: determining whether the temperature at the water separator outlet is less than a preset first temperature and whether the first pressure difference is greater than or equal to a preset first pressure difference; and if the temperature at the water separator outlet is less than the preset first temperature and / or if the first pressure difference is greater than or equal to the preset first pressure difference, it is determined that the hot side of the regenerator and the hot side of the condenser are likely to freeze.

[0040] When the air circulation system is running, the air in the hot side of the regenerator and the condenser is likely to freeze, and whether freezing is likely to occur can be determined according to the temperature at the water separator outlet. The value range of the preset first temperature is related to the moisture content at the system outlet. Specifically, when the moisture content > 3 g / kg, the preset first temperature is 2-8℃; when 1 g / kg < moisture content ≤ 3 g / kg, the preset first temperature is -3-2℃; and when the moisture content ≤ 1 g / kg, the preset first temperature is -30--3℃. When the temperature at the water separator outlet ≥ the preset first temperature, the system is controlled normally; when the temperature at the water separator outlet < the preset first temperature, it is considered that the air in the hot side of the regenerator and the condenser is likely to freeze, and anti-freezing treatment is needed at this time to avoid freezing on the condenser fins caused by the temperature of the wet air in the hot side being below 0℃.

[0041] When the pressure drop of the hot side of the regenerator is too large, freezing is also likely to occur. Specifically, when the pressure difference between the hot side and the cold side of the regenerator is too large, the flow of air will be blocked, heat transfer will be uneven, the heat exchange efficiency between the hot side and the cold side will be reduced, and cold will continuously accumulate to cause freezing. The value range of the preset first pressure difference is 8-30 kPa. When the first pressure difference < the preset first pressure difference, the system is controlled normally; when the first pressure difference ≥ the preset first pressure difference, it is considered that the regenerator is likely to freeze, and anti-freezing treatment is needed at this time.

[0042] At step S130, if it is determined that the hot side of the regenerator and the hot side of the condenser are likely to freeze, the opening and closing of the first valve and the second valve are controlled according to the temperature at the water separator outlet and the first pressure difference, respectively.

[0043] In some embodiments, in step S130, the specific process of controlling the opening and closing of the first valve and the second valve according to the temperature at the water separator outlet and the first pressure difference respectively includes: opening the first valve; determining the size of the temperature at the water separator outlet; if the temperature at the water separator outlet is less than a preset second temperature, keeping the first valve open and increasing the opening degree of the first valve to increase the temperature at the water separator outlet to between the preset second temperature and a preset third temperature, for example, increasing the opening degree of the first valve to increase the temperature at the water separator outlet, and reducing the opening degree of the first valve to reduce the temperature at the water separator outlet; if the temperature at the water separator outlet is greater than or equal to the preset second temperature and less than the preset third temperature, closing the first valve; the preset second temperature is less than or equal to the preset third temperature.

[0044] When the temperature at the water separator outlet is less than a preset first temperature, it is considered that there is a risk of icing of the hot side air of the regenerator and the condenser, at which time the temperature control valve is opened and the opening degree of the valve is adjusted in real time. The preset second temperature can be set to a range of 1-15℃, and the preset third temperature can be set to a range of 50-85℃. After the temperature control valve is opened, high-temperature and high-pressure hot air is introduced into the cold side of the condenser and mixed with low-temperature air at the turbine outlet, so that the temperature of the cold side of the condenser is increased, and the temperature of the air discharged from the hot side of the condenser is increased, the temperature at the water separator outlet is increased accordingly, the temperature of the air entering the cold side of the regenerator is increased, and icing of the hot side air of the regenerator and the condenser after heat exchange is avoided. When the temperature at the water separator outlet is between the preset second temperature and the preset third temperature, it is considered that icing does not occur and the system can operate normally and stably. Therefore, when the temperature at the water separator outlet is less than the preset second temperature, the valve is kept open and the opening degree of the valve is adjusted to increase the temperature at the water separator outlet; when the preset second temperature is less than or equal to the temperature at the water separator outlet and less than the preset third temperature, it is considered that icing does not occur, and the valve is closed and the unit operates normally.

[0045] In some embodiments, a rotor assembly is arranged in the refrigeration system, such as the fan 12 in Figure 3 The control method further includes: if the temperature at the water separator outlet is greater than or equal to the preset third temperature, or the rotating speed of the rotor assembly is less than a preset minimum rotating speed, the refrigeration system is controlled to stop running.

[0046] When the water separator outlet temperature is overheated, it may cause abnormal system operation, such as valve rotation failure, and the water separator outlet temperature cannot be adjusted. Therefore, when the water separator outlet temperature is greater than or equal to a preset third temperature, the refrigeration system stops running. In addition, when the opening of the valve is too large, the bypass flow is too large, the amount of high-temperature and high-pressure air entering the primary regenerator is too small, and the rotation speed of the air circulating machine is too low. Therefore, in order to protect the air circulating machine, when the rotation speed of the rotor assembly is less than a preset minimum rotation speed, the refrigeration system stops running. The preset minimum rotation speed is in the range of 2000-10000 rpm. In the air cycle refrigeration system, the air circulating machine is composed of a compressor, a cooling turbine and a fan.

[0047] By judging whether icing is likely to occur in the regenerator and the condenser according to the water separator outlet temperature, the opening of the temperature control valve is controlled for anti-icing treatment, the system operation stability is improved, and the safety of the system operation is improved by combining the rotor assembly in the air circulating machine.

[0048] In some embodiments, in step S130, the specific process of controlling the opening and closing of the first valve and the second valve according to the temperature at the water separator outlet and the first pressure difference respectively further includes: opening the second valve; judging the size of the first pressure difference; if the first pressure difference is greater than or equal to a preset first pressure difference, keeping the second valve open; if the first pressure difference is less than a preset third pressure difference, closing the second valve; and the preset first pressure difference is greater than or equal to the preset third pressure difference.

[0049] When the pressure difference between the hot side and the cold side of the regenerator is too large, it indicates that the pressure drop of the hot side is too large. A large pressure difference will make the flow of fluid in the regenerator complex and chaotic, affect the heat transfer and conversion, and increase the risk of icing. At this time, the pressure relief valve is opened, part of the low-temperature air discharged from the secondary heat exchanger is mixed with the air discharged from the water separator, enters the cold side of the regenerator, reduces the pressure difference between the hot side and the cold side, and prevents icing. The preset third pressure difference is in the range of 5-20 kPa. Specifically, when the first pressure difference is greater than or equal to the preset first pressure difference, the pressure relief valve is opened to reduce the first pressure difference; when the first pressure difference is less than the preset third pressure difference, it is considered that the regenerator will not ice, and the normal operation control can be restored, so the pressure relief valve is closed. When the preset third pressure difference is less than the first pressure difference and the first pressure difference is less than the preset first pressure difference, the second valve maintains the current state.

[0050] By judging whether icing is likely to occur in the regenerator and the condenser according to the pressure difference between the hot side and the cold side of the regenerator, if icing is likely to occur, the pressure relief valve is opened to prevent icing, so as to ensure the normal and stable operation of the system and improve the anti-icing ability of the system.

[0051] At step S140, it is determined whether icing occurs in the cold side of the condenser according to the second pressure difference.

[0052] In some embodiments, in step S140, the specific process of determining whether icing occurs in the refrigeration system according to the second pressure difference includes: determining whether the second pressure difference is greater than a preset second pressure difference; and if the second pressure difference is greater than the preset second pressure difference, determining that icing occurs on the cold side of the condenser.

[0053] When icing occurs on the cold side of the condenser, ice blocking occurs, that is, the pressure difference between the inlet and outlet of the cold side of the condenser is too large. The preset second pressure difference is in a range of 8-30 kPa. When the second pressure difference is less than or equal to the preset second pressure difference, the system is in normal operation control; and when the second pressure difference is greater than the preset second pressure difference, it is considered that icing occurs on the cold side of the condenser, and ice removal treatment is needed.

[0054] In step S150, if it is determined that icing occurs on the cold side of the condenser, the opening degree of the first valve is controlled according to the second pressure difference.

[0055] In some embodiments, in step S150, the specific process of controlling the opening degree of the first valve according to the second pressure difference includes: opening the first valve; determining the size of the second pressure difference; if the second pressure difference is greater than a preset second pressure difference, controlling the first valve to increase the opening degree at a first speed; the first speed is in a proportional relationship with the second pressure difference; if the second pressure difference is less than a preset fourth pressure difference, closing the first valve; and the preset second pressure difference is greater than or equal to the preset fourth pressure difference.

[0056] In the cooling turbine, air is expanded, the temperature of the gas is reduced, and a small amount of water is contained in the air. When this part of low-temperature air passes through the cold side of the condenser, the water in the air condenses and freezes in the condenser, resulting in a decrease in system performance. Therefore, when icing occurs on the cold side of the condenser, ice removal needs to be performed in time. Specifically, when the second pressure difference is greater than the preset second pressure difference, the temperature control valve is opened, and the opening degree is increased at a first speed, so that high-temperature air is bypassed to the cold side of the condenser to increase the temperature of the air for ice removal. The first speed is in a linear relationship with the second pressure difference, and the greater the second pressure difference, the greater the first speed. When the second pressure difference is less than a preset fourth pressure difference, it is considered that the ice layer on the cold side of the condenser has been melted, and the pressure drop is reduced. At this time, the unit is in normal operation control, and the temperature control valve is closed. The preset fourth pressure difference is in a range of 5-20 kPa.

[0057] By determining whether icing occurs on the cold side of the condenser according to the pressure difference between the inlet and outlet of the cold side of the condenser, and controlling the opening degree of the temperature control valve for ice removal, the system can maintain high performance, eliminate safety hazards caused by icing, and improve the safety and stability of the system.

[0058] Figure 4 The flowchart of the control method for preventing icing and removing ice of the air cycle refrigeration system is shown in FIG. 1. Figure 4As shown, the method comprises:

[0059] Step 1, the air cycle refrigeration unit is powered on for self-checking, and after the self-checking is passed, the unit is started to run, and steps 2, 3 and 4 are respectively executed.

[0060] Step 2, it is judged whether the water separator outlet temperature is < c. If the water separator outlet temperature is ≥ c, the unit is controlled to run normally. If the water separator outlet temperature is < c, the temperature control valve is opened, the valve opening degree is adjusted to increase the water separator outlet temperature, and then it is judged whether the water separator outlet temperature is greater than or equal to e or the air cycle machine rotation speed f is < n.

[0061] Step 3, it is judged whether the pressure difference p between the hot side and the cold side of the regenerator is ≥ a. If p < a, the unit is controlled to run normally. If p ≥ a, the pressure relief valve is opened, and then it is judged whether p < b. If p < b, the pressure relief valve is closed, and the unit is controlled to run normally. If p ≥ b, the pressure relief valve is maintained to be opened.

[0062] Step 4, it is judged whether the condenser cold side pressure difference p1 is > p11. If p1 ≤ p11, the unit is controlled to run normally. If p1 > p11, the valve opening degree is controlled by linearly adjusting the speed v and p1, and then it is judged whether p1 ≤ p12. If p1 ≤ p12, the valve is closed, and the unit is controlled to run normally.

[0063] The technical scheme of the embodiment is adopted. In the air cycle refrigeration system, the inlet pipeline and the condenser cold side inlet pipeline are connected through the first valve, and the outlet pipeline of the second heat exchanger and the regenerator cold side pipeline are connected through the second valve. When the system runs, whether the hot side of the regenerator and the hot side of the condenser are likely to freeze is determined according to the temperature at the water separator outlet and the first pressure difference. If it is determined that the hot side of the regenerator and the hot side of the condenser are likely to freeze, the opening and closing of the first valve and the second valve are respectively controlled according to the temperature at the water separator outlet and the first pressure difference. Moreover, whether the cold side of the condenser is frozen is determined according to the second pressure difference. If it is determined that the cold side of the condenser is frozen, the opening degree of the first valve is controlled according to the second pressure difference. Thus, whether it is likely to freeze or has been frozen is judged according to the water separator outlet temperature, the pressure difference between the hot side and the cold side of the regenerator, and the inlet and outlet pressure difference of the condenser cold side, so as to control the opening and closing and the opening degree of the valve to remove ice, prevent ice blockage, and ensure stable operation of the system.

[0064] According to an embodiment of the present invention, a control device for a refrigeration system corresponding to the control method for a refrigeration system is also provided. The inlet pipeline of the refrigeration system sequentially passes through a first heat exchanger, a compressor, a second heat exchanger, the hot side of the regenerator, the hot side of the condenser, a water separator, the cold side of the regenerator, a cooling turbine, and the cold side of the condenser, before being connected to the outlet pipeline of the refrigeration system. The inlet pipeline is further connected to the pipeline between the cooling turbine and the cold side of the condenser via a first valve. The pipeline between the second heat exchanger and the hot side of the regenerator is further connected to the pipeline between the water separator and the cold side of the regenerator via a second valve.

[0065] The refrigeration system is an air circulation refrigeration system, in which air circulates. Figure 3 As shown, the first heat exchanger is the first-stage heat exchanger 1, the second heat exchanger is the second-stage heat exchanger 3, the first valve is the temperature control valve 8, and the second valve is the pressure relief valve 13. After the high-temperature and high-pressure air source enters the refrigeration system, it undergoes heat exchange in the first-stage heat exchanger 1. The cooled air enters the compressor 2 for pressure and temperature increase, then enters the second-stage heat exchanger 3 for cooling, and then enters the hot side of the regenerator 4. There, it undergoes heat exchange with the low-temperature air on the cold side of the regenerator 4. It then passes through the hot side of the condenser 5 and undergoes heat exchange with the air on the cold side of the condenser 5, condensing the moisture in the air. The air then enters the water separator 6 to separate most of the water. The separated liquid water is sprayed into the cold side inlet of the second-stage heat exchanger 3 through a small tube. The remaining part of the air exiting the water separator 6 enters the cold side of the regenerator 4 for heat recovery, ensuring that the air does not contain droplets before entering the cooling turbine 7. Air exiting the cold side of the regenerator 4 enters the cooling turbine 7 for expansion, pressure reduction, and temperature reduction. The low-temperature air then enters the cold side of the condenser 5 for reheating. After the air temperature returns to approximately 0°C, it is discharged through the outlet pipe for user use. Fan 12 draws in outside air from the cold sides of the primary and secondary heat exchangers 1 and 3 to cool the heat exchangers. Pressure sensor 9 monitors the system outlet pressure and, combined with temperature and humidity data collected by temperature and humidity sensor 11, calculates the system outlet moisture content.

[0066] The high-temperature, high-pressure air source at the inlet pipeline also passes through the branch where the temperature control valve 8 is located, leading to the cold-side inlet of the condenser 5. When the temperature control valve 8 is opened, the system outlet temperature is increased. The outlet pipeline of the secondary heat exchanger 3 is also connected to the cold-side of the regenerator 4 via a pressure relief valve 13. When the pressure relief valve 13 is opened, some low-temperature air can mix with the air discharged from the water separator 6 and enter the cold-side of the regenerator 4, providing pressure relief. A controller 15 is used to control the opening of the temperature control valve 8.

[0067] See also Figure 2Fig. 1 is a structural schematic diagram of an embodiment of the device of the present application. The control device of the refrigeration system can include an acquisition unit 102 and a control unit 104.

[0068] The acquisition unit 102 is configured to acquire the temperature at the water separator outlet during operation of the refrigeration system, acquire the pressure difference between the hot side of the regenerator and the cold side of the regenerator, denoted as the first pressure difference, and acquire the inlet and outlet pressure difference of the cold side of the condenser, denoted as the second pressure difference. The specific functions and processes of the acquisition unit 102 are described in step S110.

[0069] The temperature at the water separator outlet is detected by the water outlet temperature sensor 14. The inlet and outlet pressure difference of the cold side of the regenerator is detected by the pressure difference sensor 10.

[0070] The control unit 104 is configured to determine whether the hot side of the regenerator and the hot side of the condenser are likely to freeze based on the temperature at the water separator outlet and the first pressure difference. The specific functions and processes of the control unit 104 are described in step S120.

[0071] In some embodiments, the specific process of the control unit 104 determining whether the hot side of the regenerator and the hot side of the condenser are likely to freeze based on the temperature at the water separator outlet and the first pressure difference includes: determining whether the temperature at the water separator outlet is less than a preset first temperature and whether the first pressure difference is greater than or equal to a preset first pressure difference; if the temperature at the water separator outlet is less than the preset first temperature and / or if the first pressure difference is greater than or equal to the preset first pressure difference, it is determined that the hot side of the regenerator and the hot side of the condenser are likely to freeze.

[0072] When the air circulation system is running, the air in the hot side of the regenerator and the condenser can freeze, and whether freezing is likely to occur can be determined based on the temperature at the water separator outlet. The value range of the preset first temperature is related to the moisture content at the system outlet, specifically, when the moisture content > 3 g / kg, the preset first temperature is 2-8℃, when 1 g / kg < moisture content ≤ 3 g / kg, the preset first temperature is -3-2℃, and when the moisture content ≤ 1 g / kg, the preset first temperature is -30--3℃. When the temperature at the water separator outlet ≥ the preset first temperature, the system is controlled normally; when the temperature at the water separator outlet < the preset first temperature, it is considered that the air in the hot side of the regenerator and the condenser is likely to freeze, and at this time, anti-freezing treatment is needed to avoid freezing on the condenser fins caused by the temperature of the wet air inside the hot side being below 0℃.

[0073] When the heat side pressure drop of the regenerator is too large, icing is also possible. Specifically, when the pressure difference between the heat side and the cold side of the regenerator is too large, the flow of air is blocked, heat transfer is uneven, the heat exchange efficiency of the heat side and the cold side is reduced, and cold is continuously accumulated to cause icing. The preset first pressure difference is in the range of 8-30 kPa. When the first pressure difference is less than the preset first pressure difference, the system is in normal operation control; when the first pressure difference is greater than or equal to the preset first pressure difference, it is considered that the regenerator may ice, and anti-icing treatment is required at this time.

[0074] The control unit 104 is also configured to control the opening and closing of the first valve and the second valve according to the temperature at the water separator outlet and the first pressure difference, respectively, if it is determined that the heat side of the regenerator and the heat side of the condenser may ice. The specific functions and processes of the control unit 104 are described in step S130.

[0075] In some embodiments, the specific process of the control unit 104 for controlling the opening and closing of the first valve and the second valve according to the temperature at the water separator outlet and the first pressure difference, respectively, includes: opening the first valve; determining the size of the temperature at the water separator outlet; if the temperature at the water separator outlet is less than a preset second temperature, keeping the first valve open and increasing the first valve opening to increase the water separator outlet temperature to between the preset second temperature and a preset third temperature, for example, increasing the first valve opening increases the water separator outlet temperature, and decreasing the first valve opening decreases the water separator outlet temperature; if the temperature at the water separator outlet is greater than or equal to the preset second temperature and less than the preset third temperature, closing the first valve; and the preset second temperature is less than or equal to the preset third temperature.

[0076] When the temperature at the water separator outlet is less than the preset first temperature, icing risk of the hot side air of the regenerator and the condenser is considered, and the temperature control valve is opened and the opening of the valve is adjusted in real time. The preset second temperature can be set to 1-15℃, and the preset third temperature can be set to 50-85℃. After the temperature control valve is opened, the high-temperature and high-pressure hot air is introduced into the cold side of the condenser and mixed with the low-temperature air at the turbine outlet, so that the temperature of the cold side of the condenser is increased, and the temperature of the air discharged from the hot side of the condenser is increased, the temperature of the water separator outlet is increased, and the temperature of the air entering the cold side of the regenerator is increased, so that icing of the hot side air of the regenerator and the condenser after heat exchange is avoided. When the temperature at the water separator outlet is between the preset second temperature and the preset third temperature, icing is not considered to occur, and the system can be normally and stably operated. Therefore, when the temperature at the water separator outlet is less than the preset second temperature, the valve is kept open and the opening of the valve is adjusted to increase the temperature at the water separator outlet; when the preset second temperature is less than or equal to the temperature at the water separator outlet and the temperature at the water separator outlet is less than the preset third temperature, the valve is closed and the unit is normally operated.

[0077] In some embodiments, a rotor assembly is provided in the refrigeration system, such as the fan 12 in Figure 3 The control unit 104 is further configured to control the refrigeration system to stop operating if the temperature at the water separator outlet is greater than or equal to the preset third temperature or the rotating speed of the rotor assembly is less than the preset minimum rotating speed.

[0078] When the temperature at the water separator outlet is overheated, abnormal operation of the system may occur, such as failure of the valve to rotate and failure to adjust the temperature at the water separator outlet. Therefore, when the temperature at the water separator outlet is greater than or equal to the preset third temperature, the refrigeration system stops operating. In addition, when the opening of the valve is too large, the bypass amount is too large, and the amount of high-temperature and high-pressure air entering the first regenerator is too small, the rotating speed of the air circulation machine is too low. Therefore, in order to protect the air circulation machine, when the rotating speed of the rotor assembly is less than the preset minimum rotating speed, the refrigeration system stops operating. The preset minimum rotating speed can be set to 2000-10000 rpm. In the air circulation refrigeration system, the air circulation machine is composed of a compressor, a cooling turbine and a fan.

[0079] By judging whether icing of the hot side of the regenerator and the condenser is likely to occur according to the temperature at the water separator outlet, the opening of the temperature control valve is controlled for anti-icing treatment, and the stability of the system is improved. At the same time, the rotor assembly in the air circulation machine is combined to protect the system from stopping, and the safety of the system is improved.

[0080] In some embodiments, the control unit 104 controls the opening and closing of the first valve and the second valve according to the temperature at the water separator outlet and the first pressure difference, respectively, and the specific process further includes: opening the second valve; determining the size of the first pressure difference; if the first pressure difference is greater than or equal to a preset first pressure difference, keeping the second valve open; if the first pressure difference is less than a preset third pressure difference, closing the second valve; and the preset first pressure difference is greater than or equal to the preset third pressure difference.

[0081] When the pressure difference between the hot side and the cold side of the regenerator is too large, it indicates that the pressure drop of the hot side is too large. A too large pressure difference will cause the flow of fluid inside the regenerator to become complex and chaotic, affecting the transfer and conversion of heat, and increasing the risk of icing. At this time, the pressure relief valve is opened, and part of the low-temperature air discharged from the secondary heat exchanger is mixed with the air discharged from the water separator and enters the cold side of the regenerator, reducing the pressure difference between the hot side and the cold side and preventing icing. The preset third pressure difference is in the range of 5-20 kPa. Specifically, when the first pressure difference is greater than or equal to the preset first pressure difference, the pressure relief valve is opened to reduce the first pressure difference; when the first pressure difference is less than the preset third pressure difference, it is considered that the regenerator will not ice and can resume normal operation, so the pressure relief valve is closed and the unit is controlled to operate normally. When the preset third pressure difference is less than the first pressure difference and the first pressure difference is less than the preset first pressure difference, the second valve is maintained in the current state.

[0082] By determining whether the regenerator and the condenser are likely to ice according to the pressure difference between the hot side and the cold side of the regenerator, if icing is likely to occur, the pressure relief valve is controlled to be opened to prevent icing, thereby ensuring normal and stable operation of the system and improving the anti-icing ability of the system.

[0083] The control unit 104 is further configured to determine whether icing occurs in the cold side of the condenser according to the second pressure difference. The specific functions and processes of the control unit 104 are described in step S140.

[0084] In some embodiments, the control unit 104 controls the opening and closing of the first valve and the second valve according to the temperature at the water separator outlet and the first pressure difference, respectively, and the specific process further includes: opening the second valve; determining the size of the first pressure difference; if the first pressure difference is greater than or equal to a preset first pressure difference, keeping the second valve open; if the first pressure difference is less than a preset third pressure difference, closing the second valve; and the preset first pressure difference is greater than or equal to the preset third pressure difference.

[0085] When the condenser cold side ices, ice blockage will cause a pressure drop, i.e., the pressure difference between the inlet and outlet of the condenser cold side is too large. The preset second pressure difference is in the range of 8-30 kPa. When the second pressure difference is less than or equal to the preset second pressure difference, the system is controlled to operate normally; when the second pressure difference is greater than the preset second pressure difference, it is considered that the condenser cold side ices and needs to be deiced.

[0086] In some embodiments, the specific process of controlling the opening degree of the first valve according to the second pressure difference by the control unit 104 comprises: opening the first valve; judging the size of the second pressure difference; if the second pressure difference is greater than a preset second pressure difference, controlling the first valve to increase the opening degree at a first speed; the first speed is in a proportional relationship with the second pressure difference; if the second pressure difference is less than a preset fourth pressure difference, closing the first valve; the preset second pressure difference is greater than or equal to the preset fourth pressure difference.

[0087] In the cooling turbine, air is expanded, the temperature of the gas is reduced, and a small amount of water is contained in the air. When this part of low-temperature air is cooled by the condenser, the water in the air is condensed and frozen in the condenser, resulting in a decrease in system performance. Therefore, when the condenser cold edge freezes, deicing needs to be performed in a timely manner. Specifically, when the second pressure difference is greater than a preset second pressure difference, the temperature control valve is opened, and the opening degree is increased at a first speed, so that the high-temperature air is bypassed to the condenser cold edge, the air temperature is increased, and deicing is performed. The first speed is in a linear relationship with the second pressure difference, and the greater the second pressure difference, the greater the first speed. When the second pressure difference is less than a preset fourth pressure difference, it is considered that the deicing condition is reached, the ice layer of the condenser cold edge has been melted, and the pressure drop is reduced. At this time, the unit is controlled to operate normally, and the temperature control valve is closed. The preset fourth pressure difference is in the range of 5-20 kPa.

[0088] By judging whether the condenser cold edge freezes according to the pressure difference between the inlet and outlet of the condenser cold edge, the opening degree of the temperature control valve is controlled for deicing, so that the system maintains high performance, the safety hazard caused by freezing is eliminated, and the safety and stability of the system are improved.

[0089] Figure 4 The flowchart of the control method for preventing icing and deicing of the air cycle refrigeration system of the present application is shown in Figure 4 The method comprises the following steps:

[0090] Step 1: The air cycle refrigeration unit is powered on and self-checked. After the self-checking is passed, the unit is started to operate, and steps 2, 3 and 4 are performed.

[0091] Step 2: It is judged whether the water separator outlet temperature is less than c. If the water separator outlet temperature is greater than or equal to c, the unit is controlled to operate normally. If the water separator outlet temperature is less than c, the temperature control valve is opened for anti-icing control, the opening degree of the valve is adjusted to increase the water separator outlet temperature, and then the size of the water separator outlet temperature and the size of the air cycle machine speed f are judged. If d≤water separator outlet temperature

[0092] Step 3, judging whether the pressure difference p of the hot side and the cold side of the regenerator is greater than or equal to a. If p < a, the unit is controlled normally. If p ≥ a, the pressure relief valve is opened, and then judging whether p < b. If p < b, the pressure relief valve is closed, and the unit is controlled normally. If p ≥ b, the pressure relief valve is kept open.

[0093] Step 4, judging whether the pressure difference p1 of the cold side of the condenser is greater than p11. If p1 ≤ p11, the unit is controlled normally. If p1 > p11, the opening of the valve is controlled linearly with the speed v and p1, and then judging whether p1 ≤ p12. If p1 ≤ p12, the valve is closed, and the unit is controlled normally.

[0094] Since the processing and functions realized by the device of the embodiment are basically corresponding to the foregoing embodiments, principles and examples of the method, the description of the embodiment is not described in detail, and the related description in the foregoing embodiments can be referred to, and will not be described here.

[0095] According to the technical scheme of the application, in the air circulation refrigeration system, the inlet pipeline and the inlet pipeline of the cold side of the condenser are connected through the first valve, the outlet pipeline of the second heat exchanger and the pipeline of the cold side of the regenerator are connected through the second valve; when the system is running, whether the hot side of the regenerator and the hot side of the condenser are likely to freeze is determined according to the temperature at the outlet of the water separator and the first pressure difference; if it is determined that the hot side of the regenerator and the hot side of the condenser are likely to freeze, the opening and closing of the first valve and the second valve are controlled according to the temperature at the outlet of the water separator and the first pressure difference respectively; and whether the cold side of the condenser is frozen is determined according to the second pressure difference; if it is determined that the cold side of the condenser is frozen, the opening of the first valve is controlled according to the second pressure difference. Thus, whether it is likely to freeze or has been frozen is judged according to the temperature at the outlet of the water separator, the pressure difference of the hot side and the cold side of the regenerator, and the pressure difference between the inlet and outlet of the cold side of the condenser, so as to control the opening and closing and the opening of the valve to remove ice, prevent ice blockage, and ensure stable operation of the system.

[0096] According to the embodiment of the application, a refrigeration system corresponding to the control device of the refrigeration system is also provided. The refrigeration system can include the control device of the refrigeration system described above.

[0097] Since the processing and functions realized by the refrigeration system of the embodiment are basically corresponding to the foregoing embodiments, principles and examples of the device, the description of the embodiment is not described in detail, and the related description in the foregoing embodiments can be referred to, and will not be described here.

[0098] The technical scheme of the present application is adopted in the air cycle refrigeration system, the inlet pipeline is connected with the cold side inlet pipeline of the condenser through a first valve, and the outlet pipeline of the second heat exchanger is connected with the cold side pipeline of the regenerator through a second valve; during system operation, whether the hot side of the regenerator and the hot side of the condenser can freeze is determined according to the temperature at the outlet of the water separator and the first pressure difference; if it is determined that the hot side of the regenerator and the hot side of the condenser can freeze, the opening and closing of the first valve and the second valve are controlled according to the temperature at the outlet of the water separator and the first pressure difference respectively; and whether the cold side of the condenser freezes is determined according to the second pressure difference; if it is determined that the cold side of the condenser freezes, the opening degree of the first valve is controlled according to the second pressure difference. Thus, whether freezing can occur or has occurred is determined according to the temperature at the outlet of the water separator, the pressure difference between the hot side and the cold side of the regenerator, and the pressure difference between the inlet and outlet of the cold side of the condenser, so that the opening and closing and the opening degree of the valve are controlled to remove ice, prevent ice blockage, and ensure stable operation of the system.

[0099] According to the embodiment of the present application, a storage medium corresponding to the control method of the refrigeration system is also provided, the storage medium comprises a stored program, wherein when the program is executed, the device where the storage medium is located performs the control method of the refrigeration system.

[0100] Since the processing and functions realized by the storage medium of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, the description of the present embodiment is not detailed, and the relevant description in the foregoing embodiments can be referred to, which will not be repeated here.

[0101] The technical scheme of the present application is adopted in the air cycle refrigeration system, the inlet pipeline is connected with the cold side inlet pipeline of the condenser through a first valve, and the outlet pipeline of the second heat exchanger is connected with the cold side pipeline of the regenerator through a second valve; during system operation, whether the hot side of the regenerator and the hot side of the condenser can freeze is determined according to the temperature at the outlet of the water separator and the first pressure difference; if it is determined that the hot side of the regenerator and the hot side of the condenser can freeze, the opening and closing of the first valve and the second valve are controlled according to the temperature at the outlet of the water separator and the first pressure difference respectively; and whether the cold side of the condenser freezes is determined according to the second pressure difference; if it is determined that the cold side of the condenser freezes, the opening degree of the first valve is controlled according to the second pressure difference. Thus, whether freezing can occur or has occurred is determined according to the temperature at the outlet of the water separator, the pressure difference between the hot side and the cold side of the regenerator, and the pressure difference between the inlet and outlet of the cold side of the condenser, so that the opening and closing and the opening degree of the valve are controlled to remove ice, prevent ice blockage, and ensure stable operation of the system.

[0102] According to the embodiment of the present application, a computer program product corresponding to the control method of the refrigeration system is also provided, the computer program product comprises a computer program, and the computer program product is processed to execute the steps of the control method of the refrigeration system.

[0103] Since the processing and functions realized by the computer program product of the embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, the description of the embodiment does not elaborate on the related descriptions in the foregoing embodiments, which are not repeated here.

[0104] The technical scheme of the present application is adopted in the air circulation refrigeration system, the inlet pipeline is connected with the cold side inlet pipeline of the condenser through the first valve, the outlet pipeline of the second heat exchanger is connected with the cold side pipeline of the regenerator through the second valve; during the system operation, whether the hot side of the regenerator and the hot side of the condenser can be frozen is determined according to the temperature at the outlet of the water separator and the first pressure difference; if it is determined that the hot side of the regenerator and the hot side of the condenser can be frozen, the opening and closing of the first valve and the second valve are controlled according to the temperature at the outlet of the water separator and the first pressure difference respectively; and whether the cold side of the condenser is frozen is determined according to the second pressure difference; if it is determined that the cold side of the condenser is frozen, the opening degree of the first valve is controlled according to the second pressure difference. Thus, whether it can be frozen or has been frozen is judged according to the temperature at the outlet of the water separator, the pressure difference of the hot side and the cold side of the regenerator, and the pressure difference between the inlet and outlet of the cold side of the condenser, so as to control the opening and closing and the opening degree of the valve to remove ice, prevent ice blockage, and ensure stable operation of the system.

[0105] In summary, those skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0106] The above only describes the embodiments of the present application and is not used to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. A control method of a refrigeration system, characterized by, The inlet pipeline of the refrigeration system sequentially passes through a first heat exchanger, a compressor, a second heat exchanger, a hot side of a regenerator, a hot side of a condenser, a water separator, a cold side of the regenerator, a cooling turbine, and a cold side of the condenser, and is connected to an outlet pipeline of the refrigeration system; the inlet pipeline is further connected to a pipeline between the cooling turbine and the cold side of the condenser through a first valve; a pipeline between the second heat exchanger and the hot side of the regenerator is further connected to a pipeline between the water separator and the cold side of the regenerator through a second valve; the first valve is a temperature control valve, and the second valve is a pressure relief valve; The method comprises: During operation of the refrigeration system, the temperature at the outlet of the water separator is obtained; the pressure difference between the hot side of the regenerator and the cold side of the regenerator is obtained and denoted as a first pressure difference; and the pressure difference between the inlet and the outlet of the cold side of the condenser is obtained and denoted as a second pressure difference; Whether the hot side of the regenerator and the hot side of the condenser are likely to freeze is determined according to the temperature at the outlet of the water separator and the first pressure difference; If it is determined that the hot side of the regenerator and the hot side of the condenser are likely to freeze, the opening and closing of the first valve and the second valve are controlled according to the temperature at the outlet of the water separator and the first pressure difference, respectively; and / or Whether the cold side of the condenser freezes is determined according to the second pressure difference; If it is determined that the cold side of the condenser freezes, the opening degree of the first valve is controlled according to the second pressure difference.

2. The control method of a refrigeration system according to claim 1, characterized by, Whether the hot side of the regenerator and the hot side of the condenser are likely to freeze is determined according to the temperature at the outlet of the water separator and the first pressure difference, comprising: It is determined whether the temperature at the outlet of the water separator is less than a preset first temperature and whether the first pressure difference is greater than or equal to a preset first pressure difference; If the temperature at the outlet of the water separator is less than the preset first temperature and / or if the first pressure difference is greater than or equal to the preset first pressure difference, it is determined that the hot side of the regenerator and the hot side of the condenser are likely to freeze; and / or Whether the refrigeration system freezes is determined according to the second pressure difference, comprising: It is determined whether the second pressure difference is greater than a preset second pressure difference; If the second pressure difference is greater than the preset second pressure difference, it is determined that the cold side of the condenser freezes.

3. The control method of a refrigeration system according to claim 1 or 2, characterized by, The opening and closing of the first valve and the second valve are controlled according to the temperature at the outlet of the water separator and the first pressure difference, respectively, comprising: The first valve is opened; It is determined whether the temperature at the outlet of the water separator is less than a preset second temperature; If the temperature at the outlet of the water separator is less than the preset second temperature, the first valve is kept open; If the temperature at the outlet of the water separator is greater than or equal to a preset second temperature and less than a preset third temperature, the first valve is closed; the preset second temperature is less than the preset third temperature.

4. The control method of a refrigeration system according to claim 3, characterized by, A rotor assembly is arranged in the refrigeration system; the rotor assembly is used to control air circulation; The control method further comprises: If the temperature at the outlet of the water separator is greater than or equal to a preset third temperature or the rotating speed of the rotor assembly is less than a preset minimum rotating speed, the refrigeration system is controlled to stop operation.

5. The control method of a refrigeration system according to claim 1 or 2, characterized by, The opening and closing of the first valve and the second valve are respectively controlled according to the temperature at the water separator outlet and the first pressure difference, and the method further comprises: opening the second valve; judging the size of the first pressure difference; if the first pressure difference is greater than or equal to a preset first pressure difference, keeping the second valve open; if the first pressure difference is less than a preset third pressure difference, closing the second valve; the preset first pressure difference is greater than or equal to the preset third pressure difference.

6. The control method of a refrigeration system according to claim 1 or 2, characterized by, The opening degree of the first valve is controlled according to the second pressure difference, and the method comprises: opening the first valve; judging the size of the second pressure difference; if the second pressure difference is greater than a preset second pressure difference, controlling the first valve to increase the opening degree at a first speed; the first speed is in a proportional relationship with the second pressure difference; if the second pressure difference is less than a preset fourth pressure difference, closing the first valve; the preset second pressure difference is greater than or equal to the preset fourth pressure difference.

7. A control device for a refrigeration system, characterized by The inlet pipeline of the refrigeration system sequentially passes through a first heat exchanger, a compressor, a second heat exchanger, a hot side of a regenerator, a hot side of a condenser, a water separator, a cold side of the regenerator, a cooling turbine, and a cold side of the condenser, and is connected to an outlet pipeline of the refrigeration system; the inlet pipeline is further connected to a pipeline between the cooling turbine and the cold side of the condenser through a first valve; a pipeline between the second heat exchanger and the hot side of the regenerator is further connected to a pipeline between the water separator and the cold side of the regenerator through a second valve; the first valve is a temperature control valve, and the second valve is a pressure relief valve; The control device comprises: an acquisition unit configured to acquire the temperature at the water separator outlet, acquire a pressure difference between the hot side of the regenerator and the cold side of the regenerator, denoted as a first pressure difference, and acquire an inlet-outlet pressure difference of the cold side of the condenser, denoted as a second pressure difference, during operation of the refrigeration system; a control unit configured to determine whether the hot side of the regenerator and the hot side of the condenser are likely to freeze according to the temperature at the water separator outlet and the first pressure difference; the control unit is configured to control the opening and closing of the first valve and the second valve according to the temperature at the water separator outlet and the first pressure difference, respectively, if it is determined that the hot side of the regenerator and the hot side of the condenser are likely to freeze; and / or, the control unit is configured to determine whether the cold side of the condenser is likely to freeze according to the second pressure difference; the control unit is configured to control the opening degree of the first valve according to the second pressure difference if it is determined that the cold side of the condenser is likely to freeze.

8. A refrigeration system characterized by, The control device of the refrigeration system of claim 7. The storage medium comprises a stored program, wherein the program controls the device in which the storage medium is located to perform the control method of the refrigeration system of any one of claims 1 to 6 when the program is executed.

9. A storage medium, characterized by The computer program is executed by a processor to implement the steps of the method of any one of claims 1 to 6.

10. A computer program product comprising a computer program, characterized in that, ​

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