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

Abstract

The invention discloses a control method and device of a refrigerating system, the refrigerating system, a storage medium and a computer program product. An inlet of the refrigerating system is further connected with a cold side inlet of a condenser through a first valve, and an outlet of a secondary heat exchanger is further connected with a cold side of a heat regenerator through a second valve; the method comprises the steps that whether the hot side of a heat regenerator and the hot side of a condenser are possibly frozen or not is judged according to the outlet temperature of a water separator and the first pressure difference between the hot side and the cold side of the heat regenerator, and if it is determined that freezing is possible, a first valve and a second valve are controlled to be opened and closed according to the outlet temperature of the water separator and the first pressure difference; whether the cold side of the condenser is frozen or not is judged according to the second pressure difference of the inlet and the outlet of the cold side of the condenser, and if it is determined that freezing occurs, the opening degree of the first valve is controlled according to the second pressure difference. According to the scheme, the valve is controlled to be opened and closed to prevent icing and remove ice by judging whether icing is possible or iced, so that ice blockage is avoided, and stable operation of the system is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of refrigeration systems, and specifically relates to a control method and device for a refrigeration system, a refrigeration system, a storage medium and a computer program product. Background Art

[0002] In an air circulation refrigeration system, if icing occurs, it will affect the stability of operation and bring serious risks to the system. The locations where icing occurs are mainly the turbine outlet and the cold side of the condenser, as well as the hot side of the regenerator and the hot side of the condenser. Specifically, one of the ways to improve the refrigeration capacity is to remove water vapor from the air before the air is supplied to the turbine. The relevant scheme adopts a high-pressure dehydration method. Although the high-pressure dehydration efficiency is generally around 90%, the absolute moisture content entering the turbine in the system is still higher than the system design point, causing icing at the turbine outlet and the condenser, which can easily cause ice blockage between the turbine outlet and the condenser. In addition, in some extreme cases, when the turbine outlet temperature is low, the humid air temperature at the hot side of the regenerator and the hot side of the condenser is too low, resulting in icing on the hot side.

[0003] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0004] The object of the present invention is to provide a control method, device, refrigeration system, storage medium and computer program product for a refrigeration system, so as to solve the problem of ice formation in the air circulation refrigeration system in related schemes and reduce the stability of system operation, so as to achieve the effect of preventing and removing ice by judging whether ice may form or has formed according to the outlet temperature of the water separator, the pressure difference between the hot side and the cold side of the regenerator, and the inlet and outlet pressure difference of the cold side of the condenser, thereby controlling the opening and closing of the valve and the opening degree to prevent ice formation and de-icing, prevent ice blockage and ensure stable operation of the system.

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

[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 outlet of the water separator and the first pressure difference, including: opening the first valve; judging the temperature at the outlet of the water separator; if the temperature at the outlet of the water separator is lower than the preset second temperature, keeping the first valve open; if the temperature at the outlet of the water separator is greater than or equal to the preset second temperature and lower than the preset third temperature, closing the first valve; the preset second temperature ≤ the preset third temperature.

[0008] In some embodiments, a rotor assembly is provided in the refrigeration system; the rotor assembly is used to control air circulation; the control method also includes: if the temperature at the outlet of the water separator 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 controlled respectively according to the temperature at the outlet of the water separator and the first pressure difference, and also include: opening the second valve; judging the size of the first pressure difference; if the first pressure difference is greater than or equal to the preset first pressure difference, keeping the second valve open; if the first pressure difference is less than the preset third pressure difference, closing the second valve; the preset first pressure difference ≥ the preset third pressure difference.

[0010] In some embodiments, controlling the opening of the first valve according to the second pressure differential includes: opening the first valve; determining the size of the second pressure differential; if the second pressure differential is greater than a preset second pressure differential, controlling the first valve to increase its opening at a first speed; the first speed is directly proportional to the second pressure differential; if the second pressure differential is less than a preset fourth pressure differential, closing the first valve; the preset second pressure differential ≥ the preset fourth pressure differential.

[0011] Matching the above method, the present invention provides a control device for a refrigeration system on the other hand, 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 heat exchanger, a hot side of a condenser, a water separator, a cold side of a heat exchanger, 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 also 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 heat exchanger is also connected to the pipeline between the water separator and the cold side of the heat exchanger through a second valve; the control device comprises: an acquisition unit, configured to acquire the temperature at the outlet of the water separator during the operation of the refrigeration system; acquire the temperature between the hot side of the heat exchanger and the cold side of the heat exchanger The pressure difference of the cold side of the regenerator is recorded as the first pressure difference; the inlet and outlet pressure difference of the cold side of the condenser is obtained, which is recorded as the second pressure difference; the control unit is configured to determine whether the hot side of the regenerator and the hot side of the condenser may be frozen according to the temperature at the outlet of the water separator and the first pressure difference; the control unit is configured to control the opening and closing of the first valve and the second valve respectively 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; 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 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 heat regenerator and the hot side of the condenser may be frozen based on the temperature at the outlet of the water separator and the first pressure difference, including: judging whether the temperature at the outlet of the water separator is lower than a 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 outlet of the water separator 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, then determining that the hot side of the heat regenerator and the hot side of the condenser may be frozen; and / or, the control unit determines whether the refrigeration system is frozen 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, then determining that the cold side of the condenser is frozen.

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

[0014] In some embodiments, a rotor assembly is provided in the refrigeration system; the rotor assembly is used to control air circulation; the control unit is also configured to: if the temperature at the outlet of the water separator 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, then control the refrigeration system to stop running.

[0015] In some embodiments, the control unit controls the opening and closing of the first valve and the second valve respectively according to the temperature at the outlet of the water separator and the first pressure difference, and also includes: opening the second valve; judging the size of the first pressure difference; if the first pressure difference is greater than or equal to the preset first pressure difference, keeping the second valve open; if the first pressure difference is less than the 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 of the first valve according to the second pressure differential, including: opening the first valve; determining the size of the second pressure differential; if the second pressure differential is greater than a preset second pressure differential, controlling the first valve to increase its opening at a first speed; the first speed is directly proportional to the second pressure differential; if the second pressure differential is less than a preset fourth pressure differential, closing the first valve; the preset second pressure differential ≥ the preset fourth pressure differential.

[0017] Matching the above device, the present invention provides a refrigeration system on another aspect, including: the control device of the refrigeration system mentioned above.

[0018] In accordance with the above method, the present invention provides a storage medium on another aspect, wherein the storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the above-mentioned control method for the refrigeration system.

[0019] In accordance with the above method, the present invention provides a computer program product on another aspect. The computer program product includes a computer program. When the computer program product is processed and executed, the steps of the above method for controlling a refrigeration system are implemented.

[0020] According to the scheme of the present invention, in an air circulation refrigeration system, the inlet pipeline is connected to the cold side inlet pipeline of the condenser through a first valve, and the outlet pipeline of the second heat exchanger is connected to the cold side pipeline of the regenerator through a second valve; when the system is running, it is determined whether the hot side of the regenerator and the hot side of the condenser may be frozen 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 respectively controlled according to the temperature at the outlet of the water separator and the first pressure difference; and, it is determined whether the cold side of the condenser is frozen 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. Therefore, by judging whether it is possible to freeze or has frozen according to the outlet temperature of the water separator, the pressure difference between the hot side and the cold side of the regenerator, and the inlet and outlet pressure difference of the cold side of the condenser, the opening and closing of the valve and the opening are controlled to de-ice, prevent ice blockage, and ensure stable operation of the system.

[0021] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention.

[0022] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic flow chart of an embodiment of a control method for a refrigeration system of the present invention;

[0024] Figure 2 It is a structural schematic diagram of an embodiment of a control device for a refrigeration system of the present invention;

[0025] Figure 3 It is a schematic diagram of the system structure of the air circulation refrigeration system of the present invention;

[0026] Figure 4 The figure is a flow chart of the anti-icing and deicing control method of the air circulation refrigeration system of the present invention.

[0027] In conjunction with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0028] 1-primary heat exchanger; 2-compressor; 3-secondary heat exchanger; 4-regenerator; 5-condenser; 6-water separator; 7-cooling turbine; 8-temperature control valve; 9-pressure sensor; 10-differential pressure 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 purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] In order to effectively ensure the reliable operation of the air circulation refrigeration system, when the pressure drop between the turbine outlet and the condenser outlet reaches a certain value, it is necessary to open the hot path bypass deicing. In addition, in some extreme cases, the turbine outlet temperature is low, which makes the hot side humid air temperature of the regenerator condenser too low (below 0°C), and the abnormal phenomenon of hot side icing will occur, causing the system operating pressure to rise rapidly, causing the air cycle machine to deviate from the designed operating range, the unit to operate unstably, and stall, which brings serious risks to the unit operation.

[0031] Therefore, the present invention provides a control method for preventing and deicing of an air circulation refrigeration system, which determines whether the hot side of the regenerator condenser is likely to be frozen according to the outlet temperature of the water separator and the pressure difference of the hot side of the regenerator, and controls the valve and the pressure relief valve to prevent freezing when freezing is likely; at the same time, determines whether the cold side of the condenser is frozen according to the inlet and outlet pressure difference of the cold side of the condenser, and de-ices by controlling the valve when freezing, thereby ensuring stable operation of the refrigeration system.

[0032] According to an embodiment of the present invention, a control method for a refrigeration system is provided, wherein an inlet pipeline of the refrigeration system passes through a first heat exchanger, a compressor, a second heat exchanger, a hot side of a heat regenerator, a hot side of a condenser, a water separator, a cold side of a heat regenerator, a cooling turbine, and a cold side of a condenser in sequence, 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 the pipeline between the second heat exchanger and the hot side of the heat regenerator is also connected to a pipeline between the water separator and the cold side of the heat regenerator through a second valve.

[0033] The refrigeration system is an air circulation refrigeration system, and air circulates in the refrigeration system. Figure 3As shown, the first heat exchanger is the primary heat exchanger 1, the second heat exchanger is the secondary 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 gas source enters the refrigeration system, heat exchange is carried out in the primary heat exchanger 1, and the cooled air enters the compressor 2 for pressure and temperature increase, and then enters the secondary heat exchanger 3 for cooling, and then enters the hot side of the regenerator 4, and heat exchanges with the low-temperature air on the cold side of the regenerator 4 in the regenerator 4, and then passes through the hot side of the condenser 5, and heat exchanges with the air on the cold side of the condenser 5 in the condenser 5, so that the moisture in the air condenses out, and then enters the water separator 6 to separate most of the water, and the separated liquid water is sprayed into the cold side inlet of the secondary heat exchanger 3 through a small tube, and the other part of the air coming out of the water separator 6 enters the cold side of the regenerator 4 for heat recovery, so as to ensure that the air before entering the cooling turbine 7 does not contain droplets. The air coming out of the cold side of the regenerator 4 enters the cooling turbine 7 for expansion, decompression and temperature reduction. Then the low-temperature air enters the cold side of the condenser 5 for heat recovery. After the air temperature rises to about 0°C, it is discharged from the outlet pipeline for user use. At the cold side of the primary heat exchanger 1 and the secondary heat exchanger 3, the outside air is sucked in by the fan 12 to cool the heat exchanger. The pressure sensor 9 is used to monitor the system outlet pressure. Combined with the temperature and humidity data collected by the temperature and humidity sensor 11, the moisture content at the system outlet 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, leading to 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 secondary heat exchanger 3 is also connected to the cold side of the regenerator 4 through the pressure relief valve 13. When the pressure relief valve 13 is opened, part of the low-temperature air can be mixed with the air discharged from the water separator 6 and enter the cold side of the regenerator 4 to relieve pressure. The controller 15 is used to control the opening of the temperature control valve 8.

[0035] like Figure 1 The flowchart of an embodiment of the method of the present invention is shown in FIG. The control method of the refrigeration system may 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, recorded as the first pressure difference; the inlet and outlet pressure difference of the cold side of the condenser is obtained, recorded as the second pressure difference.

[0037] 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.

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

[0039] In some embodiments, in step S120, the specific process of determining whether the hot side of the regenerator and the hot side of the condenser may be frozen based on the temperature at the outlet of the water separator and the first pressure difference includes: judging whether the temperature at the outlet of the water separator 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 outlet of the water separator 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.

[0040] When the air circulation system is running, the hot side air of the regenerator and condenser may freeze. Whether freezing may occur can be determined based on the temperature at the outlet of the water separator. The value range of the preset first temperature is related to the moisture content at the outlet of the system. Specifically, when the moisture content is greater than 3g / kg, the preset first temperature is 2 to 8°C, when 1g / kg is less than the moisture content ≤3g / kg, the preset first temperature is -3 to 2°C, and when the moisture content is ≤1g / kg, the preset first temperature is -30 to -3°C. When the temperature at the outlet of the water separator is ≥ the preset first temperature, the system operates normally; when the temperature at the outlet of the water separator is less than the preset first temperature, it is considered that the hot side air of the regenerator and condenser may freeze. At this time, anti-icing treatment is required to avoid ice on the condenser fins caused by the internal humid air temperature of the hot side being lower than 0°C.

[0041] There is also the possibility of ice formation when the pressure drop on the hot side of the regenerator is too large. Specifically, when the pressure difference between the hot side and the cold side of the regenerator is too large, the air flow will be blocked, the heat transfer will be uneven, the heat exchange efficiency between the hot side and the cold side will be reduced, and the cold will continue to accumulate and cause ice formation. The value range of the preset first pressure difference is 8 to 30 kPa. When the first pressure difference is less than the preset first pressure difference, the system operates normally; when the first pressure difference is greater than or equal to the preset first pressure difference, it is considered that the regenerator may be iced, and anti-icing treatment is required.

[0042] At step S130, 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.

[0043] In some embodiments, in step S130, the specific process of controlling the opening and closing of the first valve and the second valve respectively according to the temperature at the outlet of the water separator and the first pressure difference includes: opening the first valve; judging the temperature at the outlet of the water separator; if the temperature at the outlet of the water separator is less than the preset second temperature, keeping the first valve open, and increasing the opening of the first valve so that the outlet temperature of the water separator is increased to between the preset second temperature and the preset third temperature, for example, the outlet temperature of the water separator increases when the opening of the first valve increases, and the outlet temperature of the water separator decreases when the opening of the first valve decreases; if the temperature at the outlet of the water separator 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 ≤ the preset third temperature.

[0044] When the temperature at the outlet of the water separator is lower than the preset first temperature, it is considered that there is a risk of freezing of the hot side air of the regenerator and the condenser. At this time, the temperature control valve enters the hot side anti-freezing control, opens the temperature control valve, and adjusts the opening of the valve in real time. The value range of the preset second temperature can be set to 1-15°C, and the value range of the preset third temperature can be set to 50-85°C. After opening the temperature control valve, high-temperature and high-pressure hot air will pass into the cold side of the condenser and mix with the low-temperature air at the turbine outlet, so that the temperature of the cold side of the condenser increases, thereby increasing the temperature of the air discharged from the hot side of the condenser, the outlet temperature of the water separator increases accordingly, and the temperature of the air entering the cold side of the regenerator increases, avoiding the freezing of the hot side air of the regenerator and the condenser after heat exchange. When the temperature at the outlet of the water separator is between the preset second temperature and the preset third temperature, it is considered that freezing will not occur, and the system can operate normally and stably. Therefore, when the water separator outlet temperature is less than the preset second temperature, keep the valve open, adjust the valve opening, and increase the water separator outlet temperature; when the preset second temperature ≤ the water separator outlet temperature < the preset third temperature, it is considered that there will be no freezing, close the valve, and the unit will operate normally.

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

[0046] When the outlet temperature of the water separator is overheated, it may cause abnormal operation of the system, such as failure of the valve rotation, and inability to adjust the outlet temperature of the water separator. Therefore, when the outlet temperature of the water separator is ≥ the preset third temperature, the refrigeration system stops running. In addition, when the valve opening is too large, the bypass volume is too large, and the amount of high-temperature and high-pressure air entering the primary regenerator is too small, causing the speed of the air cycle machine to be too low. Therefore, in order to protect the air cycle machine, when the speed of the rotor assembly is less than the preset minimum speed, the refrigeration system stops running. The value range of the preset minimum speed is 2000~10000rpm. In the air circulation refrigeration system, the air cycle machine is composed of a compressor, a cooling turbine, and a fan.

[0047] By judging whether ice may occur on the hot side of the regenerator and condenser according to the outlet temperature of the water separator, the opening of the temperature control valve is controlled to prevent ice formation and improve the operating stability of the system. At the same time, the rotor assembly in the air cycle machine is combined to shut down the system for protection and improve the safety of system operation.

[0048] In some embodiments, in step S130, the specific process of controlling the opening and closing of the first valve and the second valve respectively according to the temperature at the outlet of the water separator and the first pressure difference also includes: opening the second valve; judging the size of the first pressure difference; if the first pressure difference is greater than or equal to the preset first pressure difference, keeping the second valve open; if the first pressure difference is less than the preset third pressure difference, closing the second valve; the preset first pressure difference ≥ 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 means that the pressure drop on the hot side is too large. The excessive pressure difference will cause the flow of the fluid inside the regenerator to become complicated and chaotic, affecting the transfer and conversion of heat and increasing the risk of freezing. 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 to prevent freezing. The value range of the preset third pressure difference is 5 to 20 kPa. Specifically, when the first pressure difference ≥ the preset first pressure difference, the pressure relief valve is opened to reduce the first pressure difference; when the first pressure difference < the preset third pressure difference, it is believed that the regenerator will not freeze and normal operation can be restored, so the pressure relief valve is closed and the unit is controlled to operate normally. When the preset third pressure difference ≤ the first pressure difference < the preset first pressure difference, the second valve maintains the current state.

[0050] Whether ice may form on the regenerator and condenser is determined based on the pressure difference between the hot and cold sides of the regenerator. If ice may form, the pressure relief valve is controlled to open to prevent ice from forming, thereby ensuring the normal and stable operation of the system and improving the system's anti-icing capability.

[0051] In step S140, it is determined whether ice is formed on 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 ice has occurred in the refrigeration system based on the second pressure difference includes: determining 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, determining that ice has occurred on the cold side of the condenser.

[0053] When ice forms on the cold side of the condenser, ice blockage will cause a pressure drop, that is, the inlet and outlet pressure difference of the cold side of the condenser is too large. The value range of the preset second pressure difference is 8 to 30 kPa. When the second pressure difference is ≤ the preset second pressure difference, the system operates normally; when the second pressure difference is > the preset second pressure difference, it is considered that ice forms on the cold side of the condenser and de-icing is required.

[0054] In step S150, if it is determined that ice is formed on the cold side of the condenser, the opening 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 of the first valve according to the second pressure differential includes: opening the first valve; determining the size of the second pressure differential; if the second pressure differential is greater than a preset second pressure differential, controlling the first valve to increase its opening at a first speed; the first speed is directly proportional to the second pressure differential; if the second pressure differential is less than a preset fourth pressure differential, closing the first valve; the preset second pressure differential ≥ the preset fourth pressure differential.

[0056] In the cooling turbine, the air expands, the gas temperature decreases, and the air also contains a small amount of water. 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 the cold side of the condenser freezes, it is necessary to de-ice 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 is increased at the first speed, so that the high-temperature air bypasses the cold side of the condenser, and the air temperature is increased for de-icing. The first speed is linearly related to the second pressure difference. The larger the second pressure difference, the larger the first speed; when the second pressure difference is less than the preset fourth pressure difference, it is considered that the de-icing conditions are met, the ice layer on the cold side of the condenser has melted, and the pressure drop is reduced. At this time, the unit performs normal operation control and closes the temperature control valve. The value range of the preset fourth pressure difference is 5 to 20 kPa.

[0057] By judging whether the cold side of the condenser is frozen based on the inlet and outlet pressure difference of the cold side of the condenser, the opening of the temperature control valve is controlled to de-ice, so that the system maintains a high performance, eliminates the safety hazards caused by ice, and improves the safety and stability of the system.

[0058] Figure 4 FIG. 1 is a flow chart of the anti-icing and deicing control method of the air circulation refrigeration system of the present invention, as shown in FIG. Figure 4As shown, the method includes:

[0059] Step 1: The air circulation refrigeration unit performs a power-on self-test. After the self-test passes, the unit starts and runs, and then executes steps 2, 3, and 4 respectively.

[0060] Step 2, determine whether the water separator outlet temperature is less than c. If the water separator outlet temperature is ≥c, the unit is under normal operation control. If the water separator outlet temperature is less than c, enter the temperature control valve thermal edge anti-icing control, open the valve, adjust the valve opening to increase the water separator outlet temperature, and then determine the water separator outlet temperature and the air cycle machine speed f; if d≤water separator outlet temperature<e, the unit is under normal operation control; if the water separator outlet temperature is ≥e or the air cycle machine speed f<n, the unit stops running.

[0061] Step 3, determine whether the pressure difference between the hot side and the cold side of the regenerator is p≥a. If p<a, the unit is controlled to operate normally. If p≥a, the pressure relief valve is opened, and then determine whether p<b. If p<b, the pressure relief valve is closed and the unit is controlled to operate normally; if p≥b, the pressure relief valve is kept open.

[0062] Step 4, determine whether the cold side pressure difference of the condenser p1>p11. If p1≤p11, the unit is controlled to operate normally. If p1>p11, the valve opening is controlled by linear adjustment of speed v and p1, and then determine whether p1≤p12. If p1≤p12, the valve is closed and the unit is controlled to operate normally.

[0063] By adopting the technical solution of this embodiment, in an air circulation refrigeration system, the inlet pipe is connected to the cold side inlet pipe of the condenser through the first valve, and the outlet pipe of the second heat exchanger is connected to the cold side pipe of the regenerator through the second valve; when the system is running, it is determined whether the hot side of the regenerator and the hot side of the condenser may be frozen 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 respectively controlled according to the temperature at the outlet of the water separator and the first pressure difference; and, it is determined whether the cold side of the condenser is frozen 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. Therefore, by judging whether it is possible to freeze or has frozen according to the outlet temperature of the water separator, the pressure difference between the hot side and the cold side of the regenerator, and the inlet and outlet pressure difference of the cold side of the condenser, the opening and closing of the valve and the opening degree are controlled to de-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 passes through the first heat exchanger, the compressor, the second heat exchanger, the hot side of the regenerator, the hot side of the condenser, the water separator, the cold side of the regenerator, the cooling turbine, and the cold side of the condenser in sequence, and is connected to the outlet pipeline of the refrigeration system; the inlet pipeline is also 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 also connected to the pipeline between the water separator and the cold side of the regenerator through a second valve.

[0065] The refrigeration system is an air circulation refrigeration system, and air circulates in the refrigeration system. Figure 3 As shown, the first heat exchanger is the primary heat exchanger 1, the second heat exchanger is the secondary 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 gas source enters the refrigeration system, heat exchange is carried out in the primary heat exchanger 1, and the cooled air enters the compressor 2 for pressure and temperature increase, and then enters the secondary heat exchanger 3 for cooling, and then enters the hot side of the regenerator 4, and heat exchanges with the low-temperature air on the cold side of the regenerator 4 in the regenerator 4, and then passes through the hot side of the condenser 5, and heat exchanges with the air on the cold side of the condenser 5 in the condenser 5, so that the moisture in the air condenses out, and then enters the water separator 6 to separate most of the water, and the separated liquid water is sprayed into the cold side inlet of the secondary heat exchanger 3 through a small tube, and the other part of the air coming out of the water separator 6 enters the cold side of the regenerator 4 for heat recovery, so as to ensure that the air before entering the cooling turbine 7 does not contain droplets. The air coming out of the cold side of the regenerator 4 enters the cooling turbine 7 for expansion, decompression and temperature reduction. Then the low-temperature air enters the cold side of the condenser 5 for heat recovery. After the air temperature rises to about 0°C, it is discharged from the outlet pipeline for user use. At the cold side of the primary heat exchanger 1 and the secondary heat exchanger 3, the outside air is sucked in by the fan 12 to cool the heat exchanger. The pressure sensor 9 is used to monitor the system outlet pressure. Combined with the temperature and humidity data collected by the temperature and humidity sensor 11, the moisture content at the system outlet can be calculated.

[0066] 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, leading to 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 secondary heat exchanger 3 is also connected to the cold side of the regenerator 4 through the pressure relief valve 13. When the pressure relief valve 13 is opened, part of the low-temperature air can be mixed with the air discharged from the water separator 6 and enter the cold side of the regenerator 4 to relieve pressure. The controller 15 is used to control the opening of the temperature control valve 8.

[0067] See also Figure 2The control device of the refrigeration system may include: an acquisition unit 102 and a control unit 104 .

[0068] The acquisition unit 102 is configured to acquire the temperature at the outlet of the water separator during the operation of the refrigeration system; acquire the pressure difference between the hot side of the regenerator and the cold side of the regenerator, recorded as the first pressure difference; acquire the inlet and outlet pressure difference of the cold side of the condenser, recorded as the second pressure difference. The specific functions and processing of the acquisition unit 102 refer to 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 may be frozen according to the temperature at the outlet of the water separator and the first pressure difference. The specific functions and processing of the control unit 104 refer to step S120.

[0071] In some embodiments, the control unit 104 determines whether the hot side of the heat exchanger and the hot side of the condenser may be frozen based on the temperature at the outlet of the water separator and the first pressure difference, including: judging whether the temperature at the outlet of the water separator 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 outlet of the water separator 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, it is determined that the hot side of the heat exchanger and the hot side of the condenser may be frozen.

[0072] When the air circulation system is running, the hot side air of the regenerator and condenser may freeze. Whether freezing may occur can be determined based on the temperature at the outlet of the water separator. The value range of the preset first temperature is related to the moisture content at the outlet of the system. Specifically, when the moisture content is greater than 3g / kg, the preset first temperature is 2 to 8°C, when 1g / kg is less than the moisture content ≤3g / kg, the preset first temperature is -3 to 2°C, and when the moisture content is ≤1g / kg, the preset first temperature is -30 to -3°C. When the temperature at the outlet of the water separator is ≥ the preset first temperature, the system operates normally; when the temperature at the outlet of the water separator is less than the preset first temperature, it is considered that the hot side air of the regenerator and condenser may freeze. At this time, anti-icing treatment is required to avoid ice on the condenser fins caused by the internal humid air temperature of the hot side being lower than 0°C.

[0073] There is also the possibility of ice formation when the pressure drop on the hot side of the regenerator is too large. Specifically, when the pressure difference between the hot side and the cold side of the regenerator is too large, the air flow will be blocked, the heat transfer will be uneven, the heat exchange efficiency between the hot side and the cold side will be reduced, and the cold will continue to accumulate and cause ice formation. The value range of the preset first pressure difference is 8 to 30 kPa. When the first pressure difference is less than the preset first pressure difference, the system operates normally; when the first pressure difference is greater than or equal to the preset first pressure difference, it is considered that the regenerator may be iced, and anti-icing treatment is required.

[0074] The control unit 104 is further configured to control the opening and closing of the first valve and the second valve respectively 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 specific functions and processing of the control unit 104 refer to step S130.

[0075] In some embodiments, the control unit 104 controls the specific process of opening and closing the first valve and the second valve according to the temperature at the water separator outlet and the first pressure difference, including: opening the first valve; judging the temperature at the water separator outlet; if the temperature at the water separator outlet is less than the preset second temperature, keeping the first valve open, and increasing the opening of the first valve so that the water separator outlet temperature is increased to between the preset second temperature and the preset third temperature, for example, the water separator outlet temperature increases when the opening of the first valve increases, and the water separator outlet temperature decreases when the opening of the first valve decreases; 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 ≤ the preset third temperature.

[0076] When the temperature at the outlet of the water separator is lower than the preset first temperature, it is considered that there is a risk of freezing of the hot side air of the regenerator and the condenser. At this time, the temperature control valve enters the hot side anti-freezing control, opens the temperature control valve, and adjusts the opening of the valve in real time. The value range of the preset second temperature can be set to 1-15°C, and the value range of the preset third temperature can be set to 50-85°C. After opening the temperature control valve, high-temperature and high-pressure hot air will pass into the cold side of the condenser and mix with the low-temperature air at the turbine outlet, so that the temperature of the cold side of the condenser increases, thereby increasing the temperature of the air discharged from the hot side of the condenser, the outlet temperature of the water separator increases accordingly, and the temperature of the air entering the cold side of the regenerator increases, avoiding the freezing of the hot side air of the regenerator and the condenser after heat exchange. When the temperature at the outlet of the water separator is between the preset second temperature and the preset third temperature, it is considered that freezing will not occur, and the system can operate normally and stably. Therefore, when the water separator outlet temperature is less than the preset second temperature, keep the valve open, adjust the valve opening, and increase the water separator outlet temperature; when the preset second temperature ≤ the water separator outlet temperature < the preset third temperature, it is considered that there will be no freezing, close the valve, and the unit will operate normally.

[0077] In some embodiments, the refrigeration system is provided with a rotor assembly, such as Figure 3 The fan 12 in the rotor assembly is used to control air circulation; the control unit 104 is also configured to: if the temperature at the outlet of the water separator is greater than or equal to a preset third temperature, or the speed of the rotor assembly is less than a preset minimum speed, the refrigeration system is controlled to stop running.

[0078] When the outlet temperature of the water separator is overheated, it may cause abnormal operation of the system, such as failure of the valve rotation, and inability to adjust the outlet temperature of the water separator. Therefore, when the outlet temperature of the water separator is ≥ the preset third temperature, the refrigeration system stops running. In addition, when the valve opening is too large, the bypass volume is too large, and the amount of high-temperature and high-pressure air entering the primary regenerator is too small, causing the speed of the air cycle machine to be too low. Therefore, in order to protect the air cycle machine, when the speed of the rotor assembly is less than the preset minimum speed, the refrigeration system stops running. The value range of the preset minimum speed is 2000~10000rpm. In the air circulation refrigeration system, the air cycle machine is composed of a compressor, a cooling turbine, and a fan.

[0079] By judging whether ice may occur on the hot side of the regenerator and condenser according to the outlet temperature of the water separator, the opening of the temperature control valve is controlled to prevent ice formation and improve the operating stability of the system. At the same time, the rotor assembly in the air cycle machine is combined to shut down the system for protection and improve the safety of system operation.

[0080] In some embodiments, the control unit 104 controls the specific process of opening and closing the first valve and the second valve according to the temperature at the outlet of the water separator and the first pressure difference, and also includes: opening the second valve; judging the size of the first pressure difference; if the first pressure difference is greater than or equal to the preset first pressure difference, keeping the second valve open; if the first pressure difference is less than the preset third pressure difference, closing the second valve; the preset first pressure difference ≥ 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 means that the pressure drop on the hot side is too large. The excessive pressure difference will cause the flow of the fluid inside the regenerator to become complicated and chaotic, affecting the transfer and conversion of heat and increasing the risk of freezing. 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 to prevent freezing. The value range of the preset third pressure difference is 5 to 20 kPa. Specifically, when the first pressure difference ≥ the preset first pressure difference, the pressure relief valve is opened to reduce the first pressure difference; when the first pressure difference < the preset third pressure difference, it is believed that the regenerator will not freeze and normal operation can be restored, so the pressure relief valve is closed and the unit is controlled to operate normally. When the preset third pressure difference ≤ the first pressure difference < the preset first pressure difference, the second valve maintains the current state.

[0082] Whether ice may form on the regenerator and condenser is determined based on the pressure difference between the hot and cold sides of the regenerator. If ice may form, the pressure relief valve is controlled to open to prevent ice from forming, thereby ensuring the normal and stable operation of the system and improving the system's anti-icing capability.

[0083] The control unit 104 is further configured to determine whether ice is formed on the cold side of the condenser according to the second pressure difference. The specific functions and processing of the control unit 104 refer to step S140.

[0084] In some embodiments, the control unit 104 determines whether ice is formed in the refrigeration system based on the second pressure difference, including: determining 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, determining that ice is formed on the cold side of the condenser.

[0085] When ice forms on the cold side of the condenser, ice blockage will cause a pressure drop, that is, the inlet and outlet pressure difference of the cold side of the condenser is too large. The value range of the preset second pressure difference is 8 to 30 kPa. When the second pressure difference is ≤ the preset second pressure difference, the system operates normally; when the second pressure difference is > the preset second pressure difference, it is considered that ice forms on the cold side of the condenser and de-icing is required.

[0086] In some embodiments, the control unit 104 controls the opening of the first valve according to the second pressure differential, and the specific process includes: opening the first valve; determining the size of the second pressure differential; if the second pressure differential is greater than a preset second pressure differential, controlling the first valve to increase the opening at a first speed; the first speed is proportional to the second pressure differential; if the second pressure differential is less than a preset fourth pressure differential, closing the first valve; the preset second pressure differential ≥ the preset fourth pressure differential.

[0087] In the cooling turbine, the air expands, the gas temperature decreases, and the air also contains a small amount of water. 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 the cold side of the condenser freezes, it is necessary to de-ice 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 is increased at the first speed, so that the high-temperature air bypasses the cold side of the condenser, and the air temperature is increased for de-icing. The first speed is linearly related to the second pressure difference. The larger the second pressure difference, the larger the first speed; when the second pressure difference is less than the preset fourth pressure difference, it is considered that the de-icing conditions are met, the ice layer on the cold side of the condenser has melted, and the pressure drop is reduced. At this time, the unit performs normal operation control and closes the temperature control valve. The value range of the preset fourth pressure difference is 5 to 20 kPa.

[0088] By judging whether the cold side of the condenser is frozen based on the inlet and outlet pressure difference of the cold side of the condenser, the opening of the temperature control valve is controlled to de-ice, so that the system maintains a high performance, eliminates the safety hazards caused by ice, and improves the safety and stability of the system.

[0089] Figure 4 FIG. 1 is a flow chart of the anti-icing and deicing control method of the air circulation refrigeration system of the present invention, as shown in FIG. Figure 4 As shown, the method includes:

[0090] Step 1: The air circulation refrigeration unit performs a power-on self-test. After the self-test passes, the unit starts and runs, and then executes steps 2, 3, and 4 respectively.

[0091] Step 2, determine whether the water separator outlet temperature is less than c. If the water separator outlet temperature is ≥c, the unit is under normal operation control. If the water separator outlet temperature is less than c, enter the temperature control valve thermal edge anti-icing control, open the valve, adjust the valve opening to increase the water separator outlet temperature, and then determine the water separator outlet temperature and the air cycle machine speed f; if d≤water separator outlet temperature<e, the unit is under normal operation control; if the water separator outlet temperature is ≥e or the air cycle machine speed f<n, the unit stops running.

[0092] Step 3, determine whether the pressure difference between the hot side and the cold side of the regenerator is p≥a. If p<a, the unit is controlled to operate normally. If p≥a, the pressure relief valve is opened, and then determine whether p<b. If p<b, the pressure relief valve is closed and the unit is controlled to operate normally; if p≥b, the pressure relief valve is kept open.

[0093] Step 4, determine whether the cold side pressure difference of the condenser p1>p11. If p1≤p11, the unit is controlled to operate normally. If p1>p11, the valve opening is controlled by linear adjustment of speed v and p1, and then determine whether p1≤p12. If p1≤p12, the valve is closed and the unit is controlled to operate normally.

[0094] Since the processing and functions implemented by the device of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0095] According to the technical solution of the present invention, in an air circulation refrigeration system, the inlet pipe is connected to the cold side inlet pipe of the condenser through the first valve, and the outlet pipe of the second heat exchanger is connected to the cold side pipe of the regenerator through the second valve; when the system is running, it is determined whether the hot side of the regenerator and the hot side of the condenser may be frozen 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 respectively controlled according to the temperature at the outlet of the water separator and the first pressure difference; and, it is determined whether the cold side of the condenser is frozen 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. Therefore, by judging whether it is possible to freeze or has frozen according to the outlet temperature of the water separator, the pressure difference between the hot side and the cold side of the regenerator, and the inlet and outlet pressure difference of the cold side of the condenser, the opening and closing of the valve and the opening degree are controlled to de-ice, prevent ice blockage, and ensure stable operation of the system.

[0096] According to an embodiment of the present invention, a refrigeration system corresponding to the control device of the refrigeration system is also provided. The refrigeration system may include: the control device of the refrigeration system described above.

[0097] Since the processing and functions implemented by the refrigeration system of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned devices, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0098] According to the technical solution of the present invention, in an air circulation refrigeration system, the inlet pipe is connected to the cold side inlet pipe of the condenser through the first valve, and the outlet pipe of the second heat exchanger is connected to the cold side pipe of the regenerator through the second valve; when the system is running, it is determined whether the hot side of the regenerator and the hot side of the condenser may be frozen 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 respectively controlled according to the temperature at the outlet of the water separator and the first pressure difference; and, it is determined whether the cold side of the condenser is frozen 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. Therefore, by judging whether it is possible to freeze or has frozen according to the outlet temperature of the water separator, the pressure difference between the hot side and the cold side of the regenerator, and the inlet and outlet pressure difference of the cold side of the condenser, the opening and closing of the valve and the opening degree are controlled to de-ice, prevent ice blockage, and ensure stable operation of the system.

[0099] According to an embodiment of the present invention, a storage medium corresponding to the control method of the refrigeration system is also provided, wherein the storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the control method of the refrigeration system described above.

[0100] Since the processing and functions implemented by the storage medium of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0101] According to the technical solution of the present invention, in an air circulation refrigeration system, the inlet pipe is connected to the cold side inlet pipe of the condenser through the first valve, and the outlet pipe of the second heat exchanger is connected to the cold side pipe of the regenerator through the second valve; when the system is running, it is determined whether the hot side of the regenerator and the hot side of the condenser may be frozen 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 respectively controlled according to the temperature at the outlet of the water separator and the first pressure difference; and, it is determined whether the cold side of the condenser is frozen 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. Therefore, by judging whether it is possible to freeze or has frozen according to the outlet temperature of the water separator, the pressure difference between the hot side and the cold side of the regenerator, and the inlet and outlet pressure difference of the cold side of the condenser, the opening and closing of the valve and the opening degree are controlled to de-ice, prevent ice blockage, and ensure stable operation of the system.

[0102] According to an embodiment of the present invention, a computer program product corresponding to the control method of a refrigeration system is also provided. The computer program product includes a computer program. When the computer program product is processed and executed, the steps of the control method of the refrigeration system are implemented.

[0103] Since the processing and functions implemented by the computer program product of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0104] According to the technical solution of the present invention, in an air circulation refrigeration system, the inlet pipe is connected to the cold side inlet pipe of the condenser through the first valve, and the outlet pipe of the second heat exchanger is connected to the cold side pipe of the regenerator through the second valve; when the system is running, it is determined whether the hot side of the regenerator and the hot side of the condenser may be frozen 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 respectively controlled according to the temperature at the outlet of the water separator and the first pressure difference; and, it is determined whether the cold side of the condenser is frozen 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. Therefore, by judging whether it is possible to freeze or has frozen according to the outlet temperature of the water separator, the pressure difference between the hot side and the cold side of the regenerator, and the inlet and outlet pressure difference of the cold side of the condenser, the opening and closing of the valve and the opening degree are controlled to de-ice, prevent ice blockage, and ensure stable operation of the system.

[0105] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0106] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A control method for a refrigeration system, characterized in that: The inlet pipeline of the refrigeration system passes through the first heat exchanger, the compressor, the second heat exchanger, the hot side of the regenerator, the hot side of the condenser, the water separator, the cold side of the regenerator, the cooling turbine, and the cold side of the condenser in sequence, and is connected to the outlet pipeline of the refrigeration system; the inlet pipeline is also 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 also 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, 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, which is recorded as the first pressure difference; the inlet and outlet pressure difference of the cold side of the condenser is obtained, which is recorded as the second pressure difference; determining whether the hot side of the regenerator and the hot side of the condenser are likely to be frozen 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, determining whether ice is formed on the cold side of the condenser according to the second pressure difference; If it is determined that ice has formed on the cold side of the condenser, the opening of the first valve is controlled according to the second pressure difference.

2. The control method of the refrigeration system according to claim 1, characterized in that: Determining whether the hot side of the regenerator and the hot side of the condenser are likely to be frozen according to the temperature at the outlet of the water separator and the first pressure difference, comprises: Determining whether the temperature at the outlet of the water separator is lower 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 lower 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 may be frozen; and / or, Determining whether ice 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; If the second pressure difference is greater than the preset second pressure difference, it is determined that ice is formed on the cold side of the condenser.

3. The control method of a refrigeration system according to claim 1 or 2, characterized in that: The first valve and the second valve are respectively controlled to be opened and closed according to the temperature at the outlet of the water separator and the first pressure difference, comprising: Opening the first valve; Determining the temperature at the outlet of the water separator; If the temperature at the outlet of the water separator is lower than a preset second temperature, keeping the first valve open; If the temperature at the outlet of the water separator is greater than or equal to the preset second temperature and less than the preset third temperature, the first valve is closed; the preset second temperature ≤ the preset third temperature.

4. The control method of the refrigeration system according to claim 3, characterized in that: The refrigeration system is provided with a rotor assembly; the rotor assembly is used to control air circulation; The control method further includes: If the temperature at the outlet of the water separator 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.

5. The control method of a refrigeration system according to claim 1 or 2, characterized in that: The method further comprises: controlling the opening and closing of the first valve and the second valve respectively according to the temperature at the outlet of the water separator and the first pressure difference; opening the second valve; determining a magnitude of the first pressure difference; If the first pressure difference is greater than or equal to the preset first pressure difference, keeping the second valve open; If the first pressure difference is less than the preset third pressure difference, the second valve is closed; the preset first pressure difference ≥ the preset third pressure difference.

6. The control method of a refrigeration system according to claim 1 or 2, characterized in that: Controlling the opening of the first valve according to the second pressure difference includes: Opening the first valve; determining a magnitude of the second pressure difference; If the second pressure difference is greater than the preset second pressure difference, the first valve is controlled to increase its opening at a first speed; the first speed is proportional to the second pressure difference; If the second pressure difference is less than the preset fourth pressure difference, the first valve is closed; the preset second pressure difference ≥ the preset fourth pressure difference.

7. A control device for a refrigeration system, characterized in that: The inlet pipeline of the refrigeration system passes through the first heat exchanger, the compressor, the second heat exchanger, the hot side of the regenerator, the hot side of the condenser, the water separator, the cold side of the regenerator, the cooling turbine, and the cold side of the condenser in sequence, and is connected to the outlet pipeline of the refrigeration system; the inlet pipeline is also 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 also connected to the 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 the temperature at the outlet of the water separator during the operation of the refrigeration system; acquire the pressure difference between the hot side of the regenerator and the cold side of the regenerator, recorded as a first pressure difference; acquire the inlet and outlet pressure difference of the cold side of the condenser, recorded as a second pressure difference; a control unit configured to determine whether the hot side of the regenerator and the hot side of the condenser are likely to be frozen based on the temperature at the outlet of the water separator and the first pressure difference; The control unit is configured to control the opening and closing of the first valve and the second valve respectively 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; and / or, The control unit is configured to determine whether ice is formed on the cold side of the condenser according to the second pressure difference; The control unit is configured to control the opening of the first valve according to the second pressure difference if it is determined that ice is formed on the cold side of the condenser.

8. A refrigeration system, characterized in that: include: The control device for a refrigeration system as claimed in claim 7.

9. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the control method of the refrigeration system according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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