A control method and device of a cold storage, the cold storage and a storage medium

Abstract

The application discloses a control method and device of a cold storage, the cold storage and a storage medium, and relates to the technical field of cold storage control. The method comprises the following steps: determining a warehouse that needs refrigeration in the cold storage, and recording the warehouse as a current warehouse; starting a water pump, and opening an air inlet valve and an air return valve of the current warehouse; delaying for a first set time, and then starting a compressor; delaying for the first set time again, and then starting the compressor to engage gears, and delaying for a second set time after each gear is engaged; after the compressor is fully engaged, delaying for the first set time, and then starting the refrigeration equipment of the current warehouse one by one; after an adjusting valve for supplying refrigerant is opened, obtaining the current liquid level of a refrigerant tank; and according to the current liquid level of the refrigerant tank, controlling the opening degree of the adjusting valve for supplying refrigerant, so as to start the refrigeration system and make the refrigeration system refrigerate the current warehouse. According to the scheme, the fruit storage temperature curve during the storage of the cold storage is controlled, the activity of the fruit is gradually reduced, and the preservation quality and storage time of the fruit are improved.

Description

Technical Field

[0001] This invention belongs to the field of cold storage technology, specifically relating to a control method, device, cold storage and storage medium for a cold storage, and particularly to an intelligent preservation method, device, cold storage and storage medium for fruit cold storage. Background Technology

[0002] In the relevant solutions, the refrigeration method used in cold storage for fruit storage causes the fruit stems to turn black and the appearance and taste of the fruit to deteriorate after the fruit has been stored in the cold for a long time.

[0003] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The purpose of this invention is to provide a control method, device, cold storage, and storage medium for cold storage, in order to solve the problem of fruit quality deterioration after long-term cold storage. By controlling the fruit storage temperature curve when the fruit is placed in the cold storage, the activity of the fruit is gradually reduced, thereby greatly improving the freshness and storage time of the fruit.

[0005] This invention provides a control method for a cold storage facility. The cold storage facility includes several warehouses, the number of which is n (a positive integer). A refrigeration system is installed to match the cold storage facility. The refrigeration system includes a compressor, an evaporator, a condenser, and an expansion valve. The exhaust port of the compressor returns to the suction port of the compressor after passing through the condenser, the expansion valve, and the evaporator. A refrigerant tank, a refrigerant supply regulating valve, and a water pump are also provided to match the compressor. The compressor has different speed settings. A condenser fan is installed at the condenser. For each warehouse in the cold storage facility, an inlet valve, a return valve, and an evaporator fan are provided. Each warehouse has one or more evaporator fans. The control method for the cold storage facility includes: when the refrigeration system needs to be started, determining the warehouse in the cold storage facility that currently needs refrigeration, denoted as the current warehouse; controlling the water pump to start, and controlling the inlet valve of the current warehouse... Both the gas valve and the return gas valve are open. After a first set time delay, the compressor is started. After another first set time delay, the compressor begins to engage gears, with a second set time delay after each gear engagement. Once the compressor is fully engaged, after a first set time delay, the refrigeration equipment in the current warehouse is started one by one. Starting the refrigeration equipment in the current warehouse includes: starting one or more evaporator fans in the current warehouse; after one or more evaporator fans in the current warehouse have fully started, the refrigerant supply regulating valve is opened after a first set time delay; after the refrigerant supply regulating valve is opened, the refrigerant tank level is obtained and recorded as the current refrigerant tank level; based on the current refrigerant tank level, the opening degree of the refrigerant supply regulating valve is controlled to start the refrigeration system, enabling the refrigeration system to cool the current warehouse.

[0006] In some embodiments, the method further includes: n warehouses are arranged sequentially in the cold storage; when the refrigeration system cools the current warehouse, the temperature inside the current warehouse is acquired and recorded as the temperature of the current warehouse; if the current warehouse is not the last warehouse in the cold storage, and the temperature of the current warehouse reaches a set temperature, then when the temperature of the current warehouse reaches a set shutdown temperature, the air inlet valve of the current warehouse is closed, the evaporator fan of the current warehouse is shut down after a third set time delay, the evaporator fan of the current warehouse is started after a fourth set time delay, the return air valve of the current warehouse is closed, and the evaporator fan of the current warehouse is shut down after a fifth set time delay; if the current warehouse is the last warehouse in the cold storage... In the case of a warehouse, when the temperature of the current warehouse reaches the set shutdown temperature, the regulating valve for supplying refrigerant is closed. After a sixth set time delay, the compressor is controlled to downshift until it reaches level 0. After the compressor runs in idle mode for a first set time, the compressor is controlled to stop. After a fifth set time delay, the inlet valve of the current warehouse is closed, the water pump is turned off, and the evaporator is turned off. After another first set time delay, the refrigeration fan of the current warehouse is turned off. After another fourth set time delay, the refrigeration fan of the current warehouse is started and the return valve of the current warehouse is closed. After another fifth set time delay, the refrigeration fan of the current warehouse is turned off, thereby shutting down the refrigeration system and stopping the refrigeration system from refrigerating the current warehouse.

[0007] In some embodiments, the method further includes: when the refrigeration system is refrigerating the current warehouse, obtaining the pressure of the return gas valve of the current warehouse; when the pressure of the return gas valve of the current warehouse reaches a set pressure upper limit, opening the return gas valve of the current warehouse; and closing the return gas valve of the current warehouse after the pressure of the return gas valve of the current warehouse reaches below a set value and stabilizes for a first set time.

[0008] In some embodiments, the method further includes: when the refrigeration system is refrigerating the current warehouse, obtaining the discharge pressure of the compressor; when the discharge pressure of the compressor is greater than or equal to a set pressure, starting the evaporator; and if an instruction to control the refrigeration system to stop is received, shutting down the evaporator.

[0009] In some embodiments, the method further includes: when the refrigeration system is cooling the current warehouse, obtaining the temperature of the current warehouse; when the cooling mode of the refrigeration system has been activated, controlling the refrigeration system to change according to a set temperature and a daily set temperature drop to determine the shutdown temperature of the refrigeration system; and controlling the refrigeration system to exit the cooling mode of the refrigeration system until the temperature of the current warehouse is less than or equal to a set temperature threshold.

[0010] In some embodiments, the method further includes: when the refrigeration system stops refrigerating the current warehouse, obtaining the time during which the refrigeration system did not refrigerate the current warehouse, and recording it as the current time of the current warehouse; and / or, obtaining the temperature inside the current warehouse, and recording it as the temperature of the current warehouse; in the case where the refrigeration system is activated in a time mode, if the current time of the current warehouse reaches a set time, then activating the refrigeration system to refrigerate the current warehouse; and / or, in the case where the refrigeration system is activated in a temperature mode, if the temperature of the current warehouse is higher than a set activation temperature, then controlling the compressor to start to refrigerate the current warehouse; and controlling the refrigeration equipment of the current warehouse to shut down when the temperature of the current warehouse reaches a set shutdown temperature.

[0011] In some embodiments, the method further includes: when the refrigeration system is refrigerating the current warehouse, obtaining the discharge pressure of the compressor; if the discharge pressure of the compressor exceeds the set pressure and / or the water pump fails, switching the compressor's gear from the current gear to half of the current gear, then switching it from half of the current gear to 0 gear, then turning off the compressor, turning off the evaporator fan of the current warehouse, and closing the air inlet valve of the current warehouse; and closing the return air valve of the current warehouse after a sixth set time delay.

[0012] In conjunction with the above method, another aspect of the present invention provides a control device for a cold storage facility, wherein the cold storage facility has warehouses, the number of which is n, where n is a positive integer; a refrigeration system is provided to the cold storage facility; the refrigeration system includes: a compressor, an evaporator, a condenser, and an expansion valve; the exhaust port of the compressor returns to the suction port of the compressor after passing through the condenser, the expansion valve, and the evaporator; a refrigerant tank, a refrigerant supply regulating valve, and a water pump are also provided to the compressor; the compressor has different speed settings; a condenser fan is provided at the condenser; for each warehouse in the cold storage facility, an intake valve, a return valve, and an evaporator fan are provided; the number of evaporator fans in each warehouse is one or more; the control device for the cold storage facility includes: a control unit configured to determine, when the refrigeration system needs to be started, the warehouse in the cold storage facility that currently needs refrigeration, denoted as the current warehouse; the control unit is also configured to control the water pump to start, and... The system operates as follows: The inlet and outlet valves of the current warehouse are both open. After a first set time delay, the compressor is started. After another first set time delay, the compressor begins to engage gears, with a second set time delay after each gear engagement. Once the compressor is fully engaged, after a first set time delay, the refrigeration equipment in the current warehouse is started one by one. Starting the refrigeration equipment in the current warehouse includes: starting one or more evaporator fans within the current warehouse; after one or more evaporator fans in the current warehouse have fully started, the refrigerant supply regulating valve is opened after a first set time delay. An acquisition unit is configured to acquire the refrigerant tank level after the refrigerant supply regulating valve is opened, and record this as the current refrigerant tank level. The control unit is further configured to control the opening degree of the refrigerant supply regulating valve based on the current refrigerant tank level, thereby starting the refrigeration system to refrigerate the current warehouse.

[0013] In some embodiments, the system further includes: the acquisition unit is further configured to, in the cold storage, arrange the n warehouses sequentially; when the refrigeration system is refrigerating the current warehouse, acquire the temperature inside the current warehouse and record it as the temperature of the current warehouse; the control unit is further configured to, when the current warehouse is not the last warehouse in the cold storage, if the temperature of the current warehouse reaches a set temperature, close the air inlet valve of the current warehouse, delay for a third set time, then close the evaporator fan of the current warehouse, delay for a fourth set time, then start the evaporator fan of the current warehouse and close the return air valve of the current warehouse, and then delay for a fifth set time before closing the evaporator fan of the current warehouse; the control unit is further configured to, If the current warehouse is the last warehouse in the cold storage, and the temperature of the current warehouse reaches the set shutdown temperature, the regulating valve for supplying refrigerant is closed. After a sixth set time delay, the compressor is controlled to downshift until it reaches level 0. After the compressor runs in idle mode for a first set time, the compressor is controlled to stop. After a fifth set time delay, the air inlet valve of the current warehouse is closed, the water pump is turned off, and the evaporator is turned off. After another first set time delay, the refrigeration fan of the current warehouse is turned off. After another fourth set time delay, the refrigeration fan of the current warehouse is started and the return air valve of the current warehouse is closed. After another fifth set time delay, the refrigeration fan of the current warehouse is turned off, thereby shutting down the refrigeration system and stopping the refrigeration system from cooling the current warehouse.

[0014] In some embodiments, the system further includes: the acquisition unit is further configured to acquire the pressure of the return valve of the current warehouse when the refrigeration system is refrigerating the current warehouse; the control unit is further configured to open the return valve of the current warehouse when the pressure of the return valve of the current warehouse reaches a set pressure upper limit; and the control unit is further configured to close the return valve of the current warehouse after stabilizing for a first set time until the pressure of the return valve of the current warehouse reaches below a set value.

[0015] In some embodiments, the system further includes: the acquisition unit is further configured to acquire the discharge pressure of the compressor when the refrigeration system is refrigerating the current warehouse; the control unit is further configured to start the evaporator when the discharge pressure of the compressor is greater than or equal to a set pressure; and the control unit is further configured to shut down the evaporator if it receives an instruction to control the refrigeration system to stop.

[0016] In some embodiments, the system further includes: the acquisition unit is further configured to acquire the temperature of the current warehouse when the refrigeration system is refrigerating the current warehouse; the control unit is further configured to control the refrigeration system to change according to a set temperature and a daily set temperature drop when the cooling mode of the refrigeration system has been activated, so as to determine the shutdown temperature of the refrigeration system; the control unit is further configured to control the refrigeration system to exit the cooling mode of the refrigeration system until the temperature of the current warehouse is less than or equal to a set temperature threshold.

[0017] In some embodiments, the system further includes: the acquisition unit is further configured to, when the refrigeration system stops refrigerating the current warehouse, acquire the time during which the refrigeration system did not refrigerate the current warehouse, and record it as the current time of the current warehouse; and / or, acquire the temperature inside the current warehouse, and record it as the temperature of the current warehouse; the control unit is further configured to, in the case where the time mode of the refrigeration system is activated, activate the refrigeration system to refrigerate the current warehouse if the current time of the current warehouse reaches a set time; and / or, the control unit is further configured to, in the case where the temperature mode of the refrigeration system is activated, control the compressor to start to refrigerate the current warehouse if the temperature of the current warehouse is higher than a set start temperature; and control the refrigeration equipment of the current warehouse to stop when the temperature of the current warehouse reaches a set stop temperature.

[0018] In some embodiments, the system further includes: the acquisition unit is further configured to acquire the discharge pressure of the compressor when the refrigeration system is refrigerating the current warehouse; the control unit is further configured to, if the discharge pressure of the compressor exceeds a set pressure and / or the water pump fails, switch the compressor's gear from the current gear to half of the current gear, then switch it from half of the current gear to 0 gear, then turn off the compressor, turn off the evaporator fan of the current warehouse, and close the air inlet valve of the current warehouse; and after a sixth set time delay, close the return air valve of the current warehouse.

[0019] In conjunction with the above-mentioned device, the present invention further provides a cold storage facility, comprising: the control device for the cold storage facility described above.

[0020] In conjunction with the above method, the present invention further provides a storage medium comprising a stored program, wherein, when the program is executed, it controls the device containing the storage medium to perform the cold storage control method described above.

[0021] Therefore, the solution of the present invention involves determining the warehouse in the cold storage that currently needs refrigeration, denoted as the current warehouse; controlling the water pump to start, and opening both the air inlet valve and the air return valve of the current warehouse; controlling the compressor to start after a first set time delay; controlling the compressor to start shifting gears after another first set time delay, with a second set time delay after each shift; after the compressor is fully shifted, after a first set time delay, controlling the refrigeration equipment in the current warehouse to start one by one; wherein, controlling the refrigeration equipment in the current warehouse to start includes: controlling one or more evaporator fans in the current warehouse to start; and after one or more evaporator fans in the current warehouse are fully shifted, controlling the refrigeration equipment in the current warehouse to start one by one. After the evaporator fan is fully started, the refrigerant supply regulating valve is opened after a first set time delay. After the refrigerant supply regulating valve is opened, the liquid level of the refrigerant tank is obtained and recorded as the current liquid level of the refrigerant tank. Based on the current liquid level of the refrigerant tank, the opening degree of the refrigerant supply regulating valve is controlled to start the refrigeration system, so that the refrigeration system can cool the current warehouse. Thus, by controlling the fruit storage temperature curve when the fruit enters the cold storage, the fruit activity is gradually reduced, which can greatly improve the freshness and storage time of the fruit and solve the problem of the fruit quality deteriorating after long-term cold storage.

[0022] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0023] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 This is a flowchart illustrating an embodiment of the cold storage control method of the present invention;

[0025] Figure 2 This is a schematic flowchart illustrating an embodiment of the process of controlling the shutdown of the refrigeration system of the cold storage in the method of the present invention;

[0026] Figure 3 This is a schematic flowchart of an embodiment of the process of automatically depressurizing the return air valve of the current warehouse of the cold storage in the method of the present invention;

[0027] Figure 4 This is a schematic flowchart of an embodiment of the process of controlling the discharge pressure of the compressor in the method of the present invention;

[0028] Figure 5 This is a schematic flowchart of an embodiment of the process of operating the cooling mode of the refrigeration system in the method of the present invention.

[0029] Figure 6This is a schematic flowchart of an embodiment of the process of operating the refrigeration system in the method of the present invention in a time mode.

[0030] Figure 7 This is a schematic flowchart of an embodiment of the process for protecting the compressor in the method of the present invention.

[0031] Figure 8 This is a schematic diagram of the structure of an embodiment of the control device for a cold storage facility according to the present invention;

[0032] Figure 9 A schematic diagram of the refrigeration cycle principle of the automatic refrigeration control system for a cold storage facility;

[0033] Figure 10 This is a flowchart illustrating an embodiment of an intelligent preservation method for fruit cold storage, wherein (a) is a flowchart illustrating the automatic start-up procedure of the automatic control refrigeration system of the cold storage, (b) is a flowchart illustrating the automatic stop procedure of the automatic control refrigeration system of the cold storage, (c) is a flowchart illustrating the automatic pressure relief control of the return gas valve, (d) is a flowchart illustrating the automatic start-up and stop of evaporative refrigeration, (e) is a flowchart illustrating the control procedure of the cooling mode, (f) is a flowchart illustrating the control procedure of the time mode, (g) is a flowchart illustrating the compressor protection mechanism, and (h) is a flowchart illustrating the control procedure of the temperature mode.

[0034] Figure 11 The image in the middle shows the host computer interface of the automatic refrigeration control system after the unmanned transformation of a cold storage facility.

[0035] Figure 12 A schematic diagram of the curve of cold storage refrigeration temperature changing over time in the cold storage refrigeration temperature control model;

[0036] Figure 13 This is a remote process diagram illustrating an embodiment of an intelligent preservation method for fruit cold storage.

[0037] Figure 14 This is a schematic diagram of the temperature control interface of a cold storage facility.

[0038] Figure 15 The diagrams show the effects of preserving fruit for six months on freshness, where (a) is a diagram of the effects of preserving fruit for six months in related solutions, and (b) is a diagram of the effects of preserving fruit for six months in the solution of the present invention.

[0039] Referring to the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0040] 102 - Acquisition unit; 104 - Control unit. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0042] Considering that the refrigeration method used in the relevant plan for fruit storage cold storage causes fruit stems to turn black and the appearance and taste of the fruit to deteriorate after the fruit has been stored in the cold for a long time, the fruit has been stored in the cold storage.

[0043] In addition, considering that the preservation of fruits in cold storage is sensitive to temperature requirements when they are put into storage, it is necessary to gradually lower the temperature to refrigerate the fruits, reduce their activity, and thus achieve long-term preservation. Furthermore, by detecting the temperature difference in different areas of the cold storage, the automatic refrigeration control system of the cold storage is activated, and then the fans in each compartment are controlled to ensure that the temperature inside the cold storage is uniform and to prevent the fruits from freezing.

[0044] Therefore, the present invention proposes a cold storage control method, specifically an intelligent preservation method for fruit cold storage. Through an automatic refrigeration control system, constant temperature storage is implemented upon entry into the cold storage (maintaining the internal temperature at a constant 13 degrees Celsius for several days from the start of entry until the storage is full; this period is the constant temperature storage time). After entry, a linear temperature-lowering method is used (cooling is performed 4-6 times per day, with each temperature drop of approximately 0.2 degrees Celsius, totaling 1 degree Celsius drop per day). Through the precise temperature control of the automatic refrigeration control system, the activity of the fruit is gradually reduced during the refrigeration process, thereby preserving the fruit for a longer period during storage.

[0045] According to embodiments of the present invention, a method for controlling a cold storage facility is provided, such as... Figure 1The diagram shows a flowchart of an embodiment of the method of the present invention. The cold storage facility includes warehouses, the number of which is n, where n is a positive integer. A refrigeration system is provided to the cold storage facility. The refrigeration system includes a compressor, an evaporator, a condenser, and an expansion valve. The exhaust port of the compressor returns to the suction port of the compressor after passing through the condenser, the expansion valve, and the evaporator. A refrigerant tank, a refrigerant supply regulating valve, and a water pump are also provided to the compressor. The compressor has different speed settings. A condenser fan is provided at the condenser. For each warehouse in the cold storage facility, an inlet valve, a return valve, and an evaporator fan are provided. Each warehouse has one or more evaporator fans. The refrigerant tank is, for example, an ammonia tank; the refrigerant supply regulating valve is, for example, an ammonia supply regulating valve; the condenser fan is a condenser fan; and the evaporator fan is a refrigeration fan. Specifically, Figure 9 This is a schematic diagram illustrating the refrigeration cycle principle of an automatic refrigeration control system for a cold storage facility. The automatic refrigeration control system includes a compressor, evaporator, condenser, expansion valve, inlet valve, ammonia supply regulating valve, and ammonia pump. It controls all actuators within the cold storage facility, including ammonia tank level, evaporative cooling, and defrosting, enabling unattended operation and remote monitoring. Figure 11 The piping of the cold storage refrigeration system shown is an ammonia liquid flow pipeline; the compressor is connected to both the evaporative cooler and the ammonia tank; a water pump is installed at the evaporative cooler, and the evaporative cooler, after passing through a liquid storage tank and a regulating valve, is connected to the switch at the fan of each compartment. The fan is the condenser. This cold storage has no return gas valve; a return gas valve is installed at the other end of the corresponding valve entering the cold storage. The evaporative cooler cools the pipeline by spraying water through the water pump and blowing air through the evaporative cooler fan, thus cooling the refrigerant inside the pipeline. The water pump is connected to the water circulation pipeline, and its function is to prevent the compressor from overheating and triggering an alarm; at the same time, the circulating water sprays onto the evaporative cooler to cool the refrigeration pipeline. The regulating valve is the valve for supplying refrigerant. The working principle of the automatic refrigeration control system of the cold storage is based on the principle of the refrigeration cycle, and the refrigeration cycle process is as follows... Figure 9As shown. The first step of the refrigeration cycle is to compress the refrigerant using a compressor. The compressor draws in low-pressure, low-temperature refrigerant gas and then compresses it into a high-pressure, high-temperature gas. The compressed high-pressure, high-temperature gas enters the condenser, where it comes into contact with the external cooling medium (usually air or water), causing the refrigerant's temperature to drop and releasing heat to the outside. In this process, the refrigerant changes from a gaseous state to a liquid state. The condensed high-pressure liquid refrigerant then enters the evaporator through an expansion valve (also known as an electronic expansion valve or throttle valve). The expansion valve's function is to reduce the refrigerant's pressure and temperature, ensuring it enters the evaporator at a low pressure and low temperature. In the evaporator, the refrigerant comes into contact with the air or items inside the cold storage, absorbing heat from the air and thus lowering the temperature inside the cold storage. In this process, the refrigerant changes from a liquid state to a gaseous state. After evaporating in the evaporator, the refrigerant returns to the compressor as a gas, starting a new refrigeration cycle.

[0046] In the solution of the present invention, such as Figure 1 As shown, the control method for the cold storage includes steps S110 to S140.

[0047] In step S110, if the refrigeration system needs to be started, the warehouse in the cold storage that currently needs refrigeration is determined and denoted as the current warehouse.

[0048] In step S120, the water pump is started, and the inlet and outlet valves of the current warehouse are opened. After a first set time delay, the compressor is started. After another first set time delay, the compressor begins to engage gears, with a second set time delay after each gear engagement. After the compressor is fully engaged, after a first set time delay, the refrigeration equipment in the current warehouse is started one by one. Starting the refrigeration equipment in the current warehouse includes starting one or more evaporator fans within the current warehouse. After one or more evaporator fans in the current warehouse have fully started, the refrigerant supply regulating valve is opened after a first set time delay. The first set time is, for example, 1 minute, and the second set time is, for example, 20 seconds.

[0049] In step S130, after the regulating valve for supplying refrigerant is opened, the liquid level of the refrigerant tank is obtained and recorded as the current liquid level of the refrigerant tank.

[0050] In step S140, the opening degree of the refrigerant supply regulating valve is controlled according to the current liquid level of the refrigerant tank to start the refrigeration system so that the refrigeration system can refrigerate the current warehouse.

[0051] Specifically, Figure 14 This is a schematic diagram of the temperature control interface for a cold storage facility. For example, it can be controlled via... Figure 14 The temperature control interface shown controls the automatic refrigeration system of the cold storage. Figure 10 This is a flowchart illustrating an embodiment of an intelligent preservation method for fruit cold storage, wherein (a) is a flowchart illustrating the automatic start-up procedure of the automatic control refrigeration system of the cold storage, (b) is a flowchart illustrating the automatic stop procedure of the automatic control refrigeration system of the cold storage, (c) is a flowchart illustrating the automatic pressure relief control of the return gas valve, (d) is a flowchart illustrating the automatic start-up and shutdown procedure of evaporative refrigeration, (e) is a flowchart illustrating the control procedure of the cooling mode, (f) is a flowchart illustrating the control procedure of the time mode, (g) is a flowchart illustrating the compressor protection mechanism, and (h) is a flowchart illustrating the control procedure of the temperature mode. The automatic refrigeration control system of the cold storage includes functions such as automatic start-up, automatic stop, compressor protection, refrigeration start-up judgment, refrigeration stop judgment, evaporative refrigeration automatic start-up and shutdown, mode switching, and automatic air blowing. The control flow of the automatic refrigeration control system of the cold storage is as follows: Figure 10 As shown.

[0052] like Figure 10 As shown in Figure (a), the automatic start-up procedure of the automatic control refrigeration system of the cold storage includes:

[0053] Step 11: After the automatic refrigeration system of the cold storage is started, select the warehouse that needs to be controlled from the various warehouses of the cold storage (such as Warehouse #1, Warehouse #2, Warehouse #3, Warehouse #4, Warehouse #5, etc.), and then proceed to Step 12. Initially, the warehouse is selected based on which warehouse contains fruit and needs refrigeration. Warehouses that are empty do not need to be selected and will not be refrigerated.

[0054] Step 12: Execute the refrigeration start-up process of the automatic control refrigeration system of the cold storage. Start the water pump and open the inlet and outlet valves of the selected cold storage unit. After a 1-minute delay, start the compressor. After another 1-minute delay, the compressor begins to engage different speeds, with a 20-second delay between each speed engagement. Once the compressor is fully engaged, after a 1-minute delay, start the refrigeration fans of each selected cold storage unit one by one, with a 10-second delay between the start-ups of each fan. After all the fans in each cold storage unit have started, after a 1-minute delay, open the regulating valve (i.e., the ammonia supply regulating valve). The valve opening is automatically adjusted according to the ammonia tank level to ensure a stable ammonia tank level and refrigerant supply. The start-up process is then complete. Multiple refrigeration fans (e.g., 2-5 fans) in each cold storage unit are arranged adjacent to each other to form a unified condenser. Figure 11 The liquid storage tank (the liquid storage tank for the refrigerant) shown is under high pressure. When the regulating valve is opened, under high pressure, the ammonia liquid enters the ammonia tank through the regulating valve. There are pipelines at the bottom of the ammonia tank to allow the ammonia liquid to flow into each cold storage. By controlling the size of the ammonia supply valve, the liquid level in the ammonia tank is kept stable, thereby ensuring a stable refrigeration effect.

[0055] This invention provides a stable and applicable intelligent control solution for fruit cold storage refrigeration. Based on achieving automation and unmanned operation of cold storage, it designs a cold storage refrigeration temperature change model to control the fruit storage temperature curve upon entry into the cold storage, gradually reducing fruit activity and thus significantly improving fruit preservation quality and storage time, solving the problem of fruit quality deterioration after long-term cold storage. Simultaneously, remote monitoring and operation via mobile phone and unmanned on-site management greatly reduce the labor intensity of cold storage personnel, reduce energy consumption for farmers and enterprises, and significantly improve the automation level of cold storage control systems in my country.

[0056] In some embodiments, the cold storage control method further includes a process of controlling the shutdown of the cold storage's refrigeration system.

[0057] The following is combined with Figure 2 The diagram shows a flowchart of an embodiment of the method of the present invention for controlling the shutdown of the refrigeration system of the cold storage, further illustrating the specific process of controlling the shutdown of the refrigeration system of the cold storage, including steps S210 to S230.

[0058] Step S210: In the cold storage, n warehouses are arranged in sequence; when the refrigeration system refrigerates the current warehouse, the temperature inside the current warehouse is obtained and recorded as the temperature of the current warehouse.

[0059] Step S220: If the current warehouse is not the last warehouse in the cold storage, and the temperature of the current warehouse reaches a set temperature, then when the temperature of the current warehouse reaches the set shutdown temperature, the air inlet valve of the current warehouse is closed, the evaporator fan of the current warehouse is turned off after a third set time delay, the evaporator fan of the current warehouse is turned on after a fourth set time delay, the return air valve of the current warehouse is closed, and the evaporator fan of the current warehouse is turned off after a fifth set time delay. Wherein, the third set time is, for example, 10 minutes, the fourth set time is, for example, 10 seconds, and the fifth set time is, for example, 5 minutes.

[0060] Step S230: If the current warehouse is the last warehouse in the cold storage, and the temperature of the current warehouse reaches the set shutdown temperature, close the refrigerant supply regulating valve. After a sixth set time delay, control the compressor to downshift until it reaches level 0. After the compressor runs in idle mode for a first set time, control the compressor to stop. After a fifth set time delay, close the intake valve of the current warehouse, turn off the water pump, and turn off the evaporator. After another first set time delay, turn off the refrigeration fan of the current warehouse. After another fourth set time delay, start the refrigeration fan of the current warehouse and close the return valve of the current warehouse. After another fifth set time delay, turn off the refrigeration fan of the current warehouse, thereby shutting down the refrigeration system and stopping the refrigeration system from cooling the current warehouse. The sixth set time is, for example, 2 minutes.

[0061] Specifically, such as Figure 10 As shown in Figure (b), the automatic shutdown procedure of the automatic control refrigeration system of the cold storage includes:

[0062] Step 21: In the refrigeration stop procedure of the automatic control refrigeration system of the cold storage, determine which warehouse has reached the set temperature. When one of the selected warehouses reaches the stop temperature but is not the last warehouse to reach the set temperature, close the air inlet valve of that warehouse and delay for 10 minutes, then turn off the fan of that warehouse. After another 10-second delay, start the fan and close the air return valve. After another 5-minute delay, turn off the fan of that warehouse. Then proceed to step 22.

[0063] Step 22: When the temperature inside the last chamber reaches the stop temperature, close the regulating valve, delay for 2 minutes, downshift the compressor until it reaches 0, run in idling for 1 minute, then stop the compressor, delay for 5 minutes, close the inlet valve, water pump, and evaporative cooler, delay for another 1 minute, then turn off the fan, delay for another 10 seconds, then start the fan and close the air return valve, delay for another 5 minutes, then turn off the fan of that chamber.

[0064] In some embodiments, the control method for the cold storage in the present invention further includes: an automatic depressurization process for controlling the return air valve of the current warehouse of the cold storage.

[0065] The following is combined with Figure 3 The diagram shows an embodiment of the process of controlling the automatic depressurization of the return air valve of the current warehouse of the cold storage in the method of the present invention. The specific process of controlling the automatic depressurization of the return air valve of the current warehouse of the cold storage is further explained, including steps S310 to S330.

[0066] Step S310: When the refrigeration system is refrigerating the current warehouse, obtain the pressure of the return gas valve of the current warehouse.

[0067] Step S320: When the pressure of the return air valve of the current warehouse reaches the set pressure limit, the return air valve of the current warehouse is opened.

[0068] Step S330: After the pressure of the return air valve of the current warehouse reaches below the set value, and after stabilizing for a first set time, close the return air valve of the current warehouse.

[0069] Specifically, such as Figure 10 As shown in (c), the automatic pressure relief control process of the return air valve includes: opening the return air valve when the pressure of the return air valve reaches the upper limit; and closing the return air valve after stabilizing for 1 minute when the pressure of the return air valve reaches below the set value.

[0070] In some embodiments of the present invention, the control method for the cold storage further includes: a process of controlling the exhaust pressure of the compressor.

[0071] The following is combined with Figure 4 The schematic diagram shows an embodiment of the process of controlling the discharge pressure of the compressor in the method of the present invention. The specific process of controlling the discharge pressure of the compressor is further explained, including steps S410 to S430.

[0072] Step S410: When the refrigeration system is refrigerating the current warehouse, obtain the discharge pressure of the compressor.

[0073] Step S420: If the discharge pressure of the compressor is greater than or equal to the set pressure, the evaporator is started.

[0074] Step S430: If a command to control the refrigeration system to stop is received, then the evaporator is turned off.

[0075] Specifically, such as Figure 10 As shown in (d), the start-up and shutdown process of the evaporative cooling system (i.e., the evaporator) includes: when the automatic control refrigeration system of the cold storage is running and the compressor discharge pressure is ≥0.9 MPa, the evaporative cooling system (i.e., the evaporator) is started; if a stop or emergency stop command is received from the automatic control refrigeration system of the cold storage, the evaporative cooling system (i.e., the evaporator) is shut down.

[0076] In some embodiments, the control method for the cold storage in the present invention further includes: the process of operating the cooling mode of the refrigeration system.

[0077] The following is combined with Figure 5The flowchart shown is a schematic diagram of an embodiment of the process of running the cooling mode of the refrigeration system in the method of the present invention. The specific process of running the cooling mode of the refrigeration system is further explained, including steps S510 to S530.

[0078] Step S510: When the refrigeration system is refrigerating the current warehouse, obtain the temperature of the current warehouse.

[0079] Step S520: When the cooling mode of the refrigeration system has been activated, control the refrigeration system to change according to the set temperature and the daily set temperature drop to determine the shutdown temperature of the refrigeration system.

[0080] Step S530: When the temperature of the current warehouse is less than or equal to the set temperature threshold, control the refrigeration system to exit the cooling mode of the refrigeration system.

[0081] Specifically, such as Figure 10 As shown in (e), the control flow of the cooling mode includes: when the automatic control refrigeration system of the cold storage is running, if the cooling mode is activated, the temperature will change according to the set temperature and the daily set temperature drop to guide the shutdown temperature; for example, the program calculates and updates the shutdown temperature at 12:00 every night, that is, the shutdown temperature of the day minus the daily temperature drop to obtain the shutdown temperature of the next day. If the selected internal temperature is ≤-1 degree Celsius, the automatic temperature drop function is canceled, that is, the function of daily temperature drop is deselected, and the shutdown temperature remains at the last calculation result, and the refrigeration shutdown will be based on this result thereafter.

[0082] In some embodiments, the cold storage control method of the present invention further includes: a process of operating the refrigeration system in a time mode.

[0083] The following is combined with Figure 6 The flowchart shown is a schematic diagram of an embodiment of the process of running the time mode of the refrigeration system in the method of the present invention. The specific process of running the time mode of the refrigeration system is further explained, including steps S610 to S630.

[0084] Step S610: If the refrigeration system stops refrigerating the current warehouse, obtain the time during which the refrigeration system did not refrigerate the current warehouse, and record it as the current time of the current warehouse; and / or, obtain the temperature inside the current warehouse, and record it as the temperature of the current warehouse.

[0085] Step S620: In the case where the refrigeration system is already activated in time mode, if the current time of the current warehouse reaches a set time, then the refrigeration system is activated to refrigerate the current warehouse. Specifically, as follows... Figure 10 As shown in (f), the control flow of the time mode includes: when the time mode is selected for the cold storage, the automatic control refrigeration system of the cold storage is set with 10 settable time options. When the current time of the corresponding cold storage reaches the set time, the refrigeration starts and refrigeration is performed on all selected cold storages. For example, if the refrigeration time is in 24-hour format, a maximum of 10 different start times can be set. When the current time reaches the set time, the refrigeration system starts.

[0086] And / or, in step S630, if the temperature mode of the refrigeration system has been activated, and the temperature of the current warehouse is higher than the set start temperature, the compressor is controlled to start so that the refrigeration system can refrigerate the current warehouse; until the temperature of the current warehouse reaches the set stop temperature, the refrigeration equipment of the current warehouse is controlled to stop.

[0087] Specifically, such as Figure 10 As shown in (h), the temperature mode control flow includes: when the temperature mode is selected for the warehouse, if the detected warehouse temperature is higher than the start-up temperature, the compressor starts cooling, and the start-up process includes all selected warehouses. When the temperature of the selected warehouses is reached, each warehouse is shut down one by one.

[0088] In some embodiments, the cold storage control method of the present invention further includes a process of protecting the compressor.

[0089] The following is combined with Figure 7 The schematic diagram shows an embodiment of the process of protecting the compressor in the method of the present invention, and further illustrates the specific process of protecting the compressor, including steps S710 to S720.

[0090] Step S710: When the refrigeration system is refrigerating the current warehouse, obtain the discharge pressure of the compressor.

[0091] Step S720: If the discharge pressure of the compressor exceeds the set pressure and / or the water pump fails, the compressor speed is switched from the current speed to half of the current speed, then switched from half of the current speed to 0 speed. After that, the compressor is turned off, the evaporator fan of the current warehouse is turned off, and the air inlet valve of the current warehouse is turned off. After a sixth set time delay, the return air valve of the current warehouse is turned off.

[0092] Specifically, such as Figure 10As shown in (g), the compressor protection mechanism process includes: when the compressor discharge pressure exceeds the set value and / or the water pump fails, the compressor switching is changed from level 1 to level 1 / 2, from level 1 / 2 to level 0, then the compressor is shut down, the program stops running, all related fans and intake valves are turned off, and the return valve is turned off after a delay of 2 minutes.

[0093] Figure 11 The image in the middle shows the host computer interface of the automatic refrigeration control system after the unmanned transformation of a cold storage facility. Figure 11 The image shows the host computer interface of the automated refrigeration control system after the unmanned transformation of a cold storage facility. It has four cold storage units. After the water pump starts, water circulates to cool the compressor. Each cold storage unit has an inlet valve installed on its inlet pipes and a return valve installed on its outlet pipes. Each cold storage unit has multiple condenser fans, and the refrigerant passes through… Figure 11 The blue liquid level tank shown in the image flows into each storage compartment from the bottom of the tank through a regulating valve. After the condenser fan starts, it cools the corresponding storage compartment.

[0094] The intelligent control system of fruit cold storage (i.e., the automatic refrigeration control system of cold storage) can be upgraded and intelligently improved by electrical automation on the basis of existing cold storage. By establishing a temperature control model of the intelligent control system of fruit cold storage, the activity of fruit is reduced after the fruit is put into storage, thereby greatly improving the freshness and storage time of fruit and solving the problem of fruit quality deterioration after long-term cold storage. This is of great significance to the upgrading of the fruit cold storage industry.

[0095] Cooling preservation based on this data model can improve the freshness of fruit during long-term storage. For example, before using this method, pears stored in cold storage for 6 months after harvesting had blackened and dried out at the stem end; after using this method and refrigeration system, the pear stem end remained green, just like when it was freshly picked, even after the same 6 months. See [link to relevant documentation] for details. Figure 15 The example shown. Figure 15 The diagrams show the effects of preserving fruit for six months on freshness, where (a) is a diagram of the effects of preserving fruit for six months in related solutions, and (b) is a diagram of the effects of preserving fruit for six months in the solution of the present invention.

[0096] The model takes the current temperature inside the cold storage as input, as well as the number of refrigeration cycles and the start time each day. After each refrigeration cycle ends, the stop temperature for the next start is reduced by 1 degree Celsius and divided by the number of refrigeration cycles. When the stop temperature for refrigeration decreases by 1 degree Celsius, the refrigeration ends for that day. This cycle continues until the temperature inside the cold storage and the stop temperature drop to -1°C. After that, the stop temperature for refrigeration is maintained at -1 degree Celsius every day.

[0097] The present invention refines and standardizes the manual refrigeration method based on experience, avoiding the influence of human factors on the refrigeration effect in manual refrigeration. By automatically refrigerating according to the standard temperature control curve, it can ensure that fruits remain fresh after long-term storage, greatly extending the shelf life.

[0098] Figure 12 This is a schematic diagram of the curve of cold storage refrigeration temperature changing over time in the cold storage refrigeration temperature control model. Figure 13 This is a remote process diagram illustrating an embodiment of an intelligent preservation method for fruit cold storage. Figure 13 As shown, users can control the PLC via a mobile app and touchscreen. The mobile app controls the PLC through a cloud server and cloud modules. Button switches, sensors, compressors, fans, water pumps, electric valves, regulating valves, etc., are all connected to the PLC. Sensors include: temperature sensors, humidity sensors, liquid level sensors, position sensors, etc.

[0099] The intelligent control system of a cold storage facility (i.e., the automatic refrigeration control system) monitors the internal environmental parameters and equipment status in real time by installing temperature sensors, humidity sensors, and liquid level sensors. The sensors transmit the collected data to the intelligent control system for processing and analysis. The intelligent control system uses a programmable logic controller (PLC) to collect field signals such as the cold storage temperature and compressor speed, controlling the compressor, water pump, and fan to complete the automatic refrigeration process, and cooling the cold storage according to a preset data model. Specifically, when collecting the cold storage temperature through the PLC, a PT100 resistance temperature detector (RTD) can be used as the temperature sensor. The resistance signal is converted into a 4-20mA signal by a transmitter, transmitted to the PLC, and then converted by an analog-to-digital converter (A / D converter) to obtain the temperature value, which is then used as the cold storage temperature. Figure 11 As shown, an ammonia pump is needed when the ammonia tank is not tall enough and liquid ammonia cannot flow to the various storage compartments by gravity, thus allowing the ammonia to circulate. In refrigeration systems without an ammonia pump, the ammonia tank is installed at a higher position, typically one floor above the floor.

[0100] like Figure 12 and Figure 13As shown, taking the storage of Crown pears as an example, a cold storage refrigeration temperature control model is established. First, the cold storage room number requiring refrigeration is selected. During the storage period, the cold storage temperature is maintained at 13℃. Due to frequent personnel entry and exit during storage, the temperature inside the cold storage room rises quickly, requiring high-frequency refrigeration. The shutdown temperature is set at 13℃, and a temperature-based refrigeration mode is used. When the temperature is too high, refrigeration automatically starts; when the temperature drops to 13℃, refrigeration automatically stops. After the storage room is full, it needs to be sealed and cooled to reduce the pears' activity, thus extending their shelf life. At this time, the control system switches to automatic cooling mode, refrigerating five times a day, each time lowering the temperature by 0.2℃, gradually reducing the activity of the Crown pears and extending their shelf life. After several days of lowering the temperature, when it reaches -1℃, the cooling mode ends, the storage room is sealed, and the system switches to time-based refrigeration mode, performing timed refrigeration to maintain the cold storage temperature at -1℃. In automatic cooling mode, a system cooling model is established, and a program is written through the intelligent control system to control the cold storage according to this temperature model.

[0101] This invention utilizes an intelligent temperature control system to monitor and regulate the cold storage temperature in real time, ensuring that fruits are within the optimal temperature range and delaying the ripening and spoilage process. Simultaneously, it monitors and regulates the humidity within the cold storage to maintain a suitable level, preventing fruit dehydration and rot. Through intelligent sensors and a monitoring system, parameters such as temperature, humidity, and gas concentration within the cold storage can be monitored in real time. By collecting the temperature data (the storage temperature) and the temperature difference between different locations within the storage, an early warning system detects abnormalities in advance and controls the automatic refrigeration control system and circulating fans to cool and circulate the temperature within the storage, thus protecting the quality of the fruits. Temperature sensors are installed in the center of the cold storage and near the condenser to collect the internal temperature; the temperature difference is the difference between these two locations. For example, when the collected temperature (the storage temperature) is below -1.5 degrees Celsius, and the temperature difference between the collected temperature and different areas within the storage is equal to 1.5 degrees Celsius, the circulating fans activate to lower the storage temperature and balance the temperature difference, preventing fruits (such as pears) from freezing. When the collected temperature, i.e. the cold storage temperature, is higher than 1 degree Celsius, the system automatically activates the automatic refrigeration control system of the cold storage to cool the inside of the storage.

[0102] In this invention, during the refrigeration process, a time-controlled temperature mode and a temperature-controlled temperature mode are set. When the fruit (e.g., pears) is stored in the cold storage during harvest season (after harvesting, the fruit needs to be boxed and placed in the cold storage), the fruit has high activity. The automatic refrigeration control system of the cold storage is used to control the temperature drop by setting an upper temperature limit, ensuring the fruit's activity continues to decrease. After the storage is sealed (e.g., a storage room is filled with pears and sealed for a long time for refrigeration and insulation), a time-controlled temperature mode is used to reduce energy consumption. By detecting temperature and other sensor parameters, when there is a large temperature difference or the temperature is too low inside the storage room, the fan is restarted. After the fan starts, the temperature is monitored in real time to achieve two stop modes: timed and temperature-difference-based, ensuring the fruit's temperature is balanced and preventing frost damage.

[0103] According to an embodiment of the present invention, a control device for a cold storage facility corresponding to a control method for a cold storage facility is also provided. See also Figure 8 The diagram shows a structural schematic of an embodiment of the device of the present invention. The cold storage includes warehouses, the number of which is n, where n is a positive integer. A refrigeration system is provided to the cold storage. The refrigeration system includes a compressor, an evaporator, a condenser, and an expansion valve. The exhaust port of the compressor returns to the suction port of the compressor after passing through the condenser, the expansion valve, and the evaporator. A refrigerant tank, a refrigerant supply regulating valve, and a water pump are also provided to the compressor. The compressor has different speed settings. A condenser fan is provided at the condenser. For each warehouse in the cold storage, an inlet valve, a return valve, and an evaporator fan are provided. Each warehouse has one or more evaporator fans. The refrigerant tank is, for example, an ammonia tank; the refrigerant supply regulating valve is, for example, an ammonia supply regulating valve; the condenser fan is a condenser fan; and the evaporator fan is a refrigeration fan. Specifically, Figure 9 This is a schematic diagram illustrating the refrigeration cycle principle of an automatic refrigeration control system for a cold storage facility. The automatic refrigeration control system includes a compressor, evaporator, condenser, expansion valve, inlet valve, ammonia supply regulating valve, and ammonia pump. It controls all actuators within the cold storage facility, including ammonia tank level, evaporative cooling, and defrosting, enabling unattended operation and remote monitoring. Defrosting occurs when frost forms on the condenser due to low temperatures; the defrosting motor is controlled to defrost the condenser, ensuring optimal refrigeration performance.

[0104] The working principle of the automatic refrigeration control system of cold storage is based on the principle of refrigeration cycle, and the refrigeration cycle process is as follows: Figure 9As shown. The first step of the refrigeration cycle is to compress the refrigerant through a compressor. The compressor draws in low-pressure, low-temperature refrigerant gas and then compresses it into high-pressure, high-temperature gas. The compressed high-pressure, high-temperature gas enters the condenser, where it comes into contact with an external cooling medium (usually air or water), causing the refrigerant's temperature to drop and releasing heat to the outside. In this process, the refrigerant changes from a gaseous state to a liquid state. The condensed high-pressure liquid refrigerant then enters the evaporator through an expansion valve (i.e., an electronic expansion valve, also known as a throttle valve). The expansion valve's function is to reduce the refrigerant's pressure and temperature, making it low-pressure and low-temperature when it enters the evaporator. In the evaporator, the refrigerant comes into contact with the air or items inside the cold storage, absorbing heat from the air and thus lowering the temperature inside the cold storage. In this process, the refrigerant changes from a liquid state to a gaseous state. After evaporating in the evaporator, the refrigerant re-enters the compressor in gaseous form, starting a new refrigeration cycle. In the scheme of this invention, as... Figure 8 As shown, the control device of the cold storage includes: an acquisition unit 102 and a control unit 104.

[0105] The control unit 104 is configured to determine, when the refrigeration system needs to be activated, the warehouse in the cold storage that currently requires refrigeration, and denoted as the current warehouse. The specific functions and processing of the control unit 104 are described in step S110.

[0106] The control unit 104 is further configured to control the water pump to start, and to open both the air inlet valve and the air return valve of the current warehouse. After a first set time delay, it controls the compressor to start; after another first set time delay, it controls the compressor to begin shifting gears, with a second set time delay after each gear shift. After the compressor is fully shifted, after a first set time delay, it controls the refrigeration equipment in the current warehouse to start one by one. Controlling the refrigeration equipment in the current warehouse includes controlling one or more evaporator fans in the current warehouse to start. After one or more evaporator fans in the current warehouse have fully started, it controls the refrigerant supply regulating valve to open after a first set time delay. The specific functions and processing of the control unit 104 are also described in step S120. The first set time is, for example, 1 minute, and the second set time is, for example, 20 seconds.

[0107] The acquisition unit 102 is configured to acquire the liquid level of the refrigerant tank after the regulating valve for supplying refrigerant is opened, and record it as the current liquid level of the refrigerant tank. The specific functions and processing of the control unit 104 are described in step S130.

[0108] The control unit 104 is further configured to control the opening of the refrigerant supply regulating valve according to the current liquid level of the refrigerant tank, thereby activating the refrigeration system to cool the current warehouse. The specific functions and processing of this control unit 104 are further described in step S140.

[0109] Specifically, Figure 14 This is a schematic diagram of the temperature control interface for a cold storage facility. For example, it can be controlled via... Figure 14 The temperature control interface shown controls the automatic refrigeration system of the cold storage. Figure 10 This is a flowchart illustrating an embodiment of an intelligent preservation method for fruit cold storage, wherein (a) is a flowchart illustrating the automatic start-up procedure of the automatic control refrigeration system of the cold storage, (b) is a flowchart illustrating the automatic stop procedure of the automatic control refrigeration system of the cold storage, (c) is a flowchart illustrating the automatic pressure relief control of the return gas valve, (d) is a flowchart illustrating the automatic start-up and shutdown procedure of evaporative refrigeration, (e) is a flowchart illustrating the control procedure of the cooling mode, (f) is a flowchart illustrating the control procedure of the time mode, (g) is a flowchart illustrating the compressor protection mechanism, and (h) is a flowchart illustrating the control procedure of the temperature mode. The automatic refrigeration control system of the cold storage includes functions such as automatic start-up, automatic stop, compressor protection, refrigeration start-up judgment, refrigeration stop judgment, evaporative refrigeration automatic start-up and shutdown, mode switching, and automatic air blowing. The control flow of the automatic refrigeration control system of the cold storage is as follows: Figure 10 As shown.

[0110] like Figure 10 As shown in Figure (a), the automatic start-up procedure of the automatic control refrigeration system of the cold storage includes:

[0111] Step 11: After the automatic refrigeration system of the cold storage is started, select the warehouse that needs to be controlled from the various warehouses of the cold storage (such as Warehouse #1, Warehouse #2, Warehouse #3, Warehouse #4, Warehouse #5, etc.), and then proceed to Step 12. Initially, the warehouse is selected based on which warehouse contains fruit and needs refrigeration. Warehouses that are empty do not need to be selected and will not be refrigerated.

[0112] Step 12: Execute the refrigeration start-up process of the automatic control refrigeration system of the cold storage. Start the water pump and open the inlet and outlet valves of the selected cold storage. After a 1-minute delay, start the compressor. After another 1-minute delay, the compressor starts to engage gears, with a 20-second delay between each gear engagement. When the compressor is fully engaged, after a 1-minute delay, start the refrigeration fans of the selected cold storage one by one, with a 10-second delay between the start-ups of the refrigeration fans in each selected cold storage. After all the refrigeration fans in the selected cold storage have started, after a 1-minute delay, open the regulating valve. The opening of the regulating valve is automatically adjusted according to the ammonia tank level to ensure a stable ammonia tank level and a stable refrigerant supply. The start-up process is now complete.

[0113] This invention provides a stable and applicable intelligent control solution for fruit cold storage refrigeration. Based on achieving automation and unmanned operation of cold storage, it designs a cold storage refrigeration temperature change model to control the fruit storage temperature curve upon entry into the cold storage, gradually reducing fruit activity and thus significantly improving fruit preservation quality and storage time, solving the problem of fruit quality deterioration after long-term cold storage. Simultaneously, remote monitoring and operation via mobile phone and unmanned on-site management greatly reduce the labor intensity of cold storage personnel, reduce energy consumption for farmers and enterprises, and significantly improve the automation level of cold storage control systems in my country.

[0114] In some embodiments, the cold storage control method of the present invention further includes:

[0115] The acquisition unit 102 is further configured to, in the cold storage, arrange the n warehouses sequentially; when the refrigeration system is refrigerating the current warehouse, acquire the temperature inside the current warehouse and record it as the temperature of the current warehouse. The specific functions and processing of this acquisition unit 102 are further described in step S210.

[0116] The control unit 104 is further configured to, if the current warehouse is not the last warehouse in the cold storage, and the temperature of the current warehouse reaches a set temperature, then, upon reaching a set shutdown temperature, close the air inlet valve of the current warehouse, delay for a third set time, shut down the evaporator fan of the current warehouse, delay for a fourth set time, start the evaporator fan of the current warehouse, close the return air valve of the current warehouse, and delay for a fifth set time before shutting down the evaporator fan of the current warehouse. The specific functions and processing of this control unit 104 are further described in step S220. The third set time is, for example, 10 minutes, the fourth set time is, for example, 10 seconds, and the fifth set time is, for example, 5 minutes.

[0117] The control unit 104 is further configured to, when the current warehouse is the last warehouse in the cold storage, and when the temperature of the current warehouse reaches the set shutdown temperature, close the refrigerant supply regulating valve, delay for a sixth set time, control the compressor to downshift until the compressor reaches level 0, control the compressor to stop after running in idling for a first set time, delay for a fifth set time, close the intake valve of the current warehouse, shut down the water pump, and shut down the evaporator, delay for another first set time, shut down the refrigeration fan of the current warehouse, delay for another fourth set time, start the refrigeration fan of the current warehouse and close the return valve of the current warehouse, delay for another fifth set time and shut down the refrigeration fan of the current warehouse, thereby shutting down the refrigeration system and stopping the refrigeration system from refrigerating the current warehouse. The specific functions and processing of this control unit 104 are also described in step S230. The sixth set time is, for example, 2 minutes.

[0118] Specifically, such as Figure 10 As shown in Figure (b), the automatic shutdown procedure of the automatic control refrigeration system of the cold storage includes:

[0119] Step 21: In the refrigeration stop procedure of the automatic control refrigeration system of the cold storage, determine which warehouse has reached the set temperature. When one of the selected warehouses reaches the stop temperature but is not the last warehouse to reach the set temperature, close the air inlet valve of that warehouse and delay for 10 minutes, then turn off the fan of that warehouse. After another 10-second delay, start the fan and close the air return valve. After another 5-minute delay, turn off the fan of that warehouse. Then proceed to step 22.

[0120] Step 22: When the temperature inside the last chamber reaches the stop temperature, close the regulating valve, delay for 2 minutes, downshift the compressor until it reaches 0, run in idling for 1 minute, then stop the compressor, delay for 5 minutes, close the inlet valve, water pump, and evaporative cooler, delay for another 1 minute, then turn off the fan, delay for another 10 seconds, then start the fan and close the air return valve, delay for another 5 minutes, then turn off the fan of that chamber.

[0121] In some embodiments, the cold storage control method of the present invention further includes:

[0122] The acquisition unit 102 is further configured to acquire the pressure of the return gas valve of the current warehouse when the refrigeration system is refrigerating the current warehouse. The specific functions and processing of the acquisition unit 102 are further described in step S310.

[0123] The control unit 104 is also configured to open the return air valve of the current warehouse when the pressure of the return air valve in the current warehouse reaches a set pressure limit. The specific functions and processing of the control unit 104 are further described in step S320.

[0124] The control unit 104 is further configured to close the return air valve of the current warehouse after a first set time has elapsed since the pressure of the return air valve of the current warehouse has fallen below a set value. The specific functions and processing of this control unit 104 are further described in step S330.

[0125] Specifically, such as Figure 10 As shown in (c), the automatic pressure relief control process of the return air valve includes: opening the return air valve when the pressure of the return air valve reaches the upper limit; and closing the return air valve after stabilizing for 1 minute when the pressure of the return air valve reaches below the set value.

[0126] In some embodiments, the cold storage control method of the present invention further includes:

[0127] The acquisition unit 102 is further configured to acquire the discharge pressure of the compressor when the refrigeration system is refrigerating the current warehouse. The specific functions and processing of the acquisition unit 102 are further described in step S410.

[0128] The control unit 104 is also configured to start the evaporator when the discharge pressure of the compressor is greater than or equal to a set pressure. The specific functions and processing of the control unit 104 are further described in step S420.

[0129] The control unit 104 is further configured to shut down the evaporator if it receives a command to control the refrigeration system to stop. The specific functions and processing of the control unit 104 are further described in step S430.

[0130] Specifically, such as Figure 10 As shown in (d), the start-up and shutdown process of the evaporative cooling system (i.e., the evaporator) includes: when the automatic control refrigeration system of the cold storage is running and the compressor discharge pressure is ≥0.9 MPa, the evaporative cooling system (i.e., the evaporator) is started; if a stop or emergency stop command is received from the automatic control refrigeration system of the cold storage, the evaporative cooling system (i.e., the evaporator) is shut down.

[0131] In some embodiments, the cold storage control method of the present invention further includes:

[0132] The acquisition unit 102 is further configured to acquire the temperature of the current warehouse when the refrigeration system is refrigerating the current warehouse. The specific functions and processing of the acquisition unit 102 are further described in step S510.

[0133] The control unit 104 is further configured to, when the cooling mode of the refrigeration system is activated, control the refrigeration system to change according to a set temperature and a daily set temperature drop to determine the shutdown temperature of the refrigeration system. The specific functions and processing of this control unit 104 are further described in step S520.

[0134] The control unit 104 is further configured to control the refrigeration system to exit the cooling mode until the current temperature of the warehouse is less than or equal to a set temperature threshold. The specific functions and processing of the control unit 104 are further described in step S530.

[0135] Specifically, such as Figure 10 As shown in (e), the control process of the cooling mode includes: when the automatic control refrigeration system of the cold storage is running, if the cooling mode is activated, the temperature will be changed according to the set temperature and the daily set temperature drop to guide the shutdown temperature; if the selected temperature inside the cold storage is ≤-1 degree Celsius, the automatic temperature drop function will be canceled.

[0136] In some embodiments, the cold storage control method of the present invention further includes:

[0137] The acquisition unit 102 is further configured to, when the refrigeration system stops refrigerating the current warehouse, acquire the time during which the refrigeration system did not refrigerate the current warehouse, and record this time as the current time of the current warehouse; and / or, acquire the temperature inside the current warehouse, and record this temperature as the current temperature of the current warehouse. For the specific functions and processing of this acquisition unit 102, please refer to step S610.

[0138] The control unit 104 is further configured to, in the case of a time mode where the refrigeration system is already activated, activate the refrigeration system if the current time of the current warehouse reaches a set time, so that the refrigeration system cools the current warehouse. The specific functions and processing of this control unit 104 are further described in step S620. Specifically, as... Figure 10 As shown in (f), the control process of the time mode includes: when the time mode is selected for the cold storage, the automatic control refrigeration system of the cold storage is set with 10 settable time options. When the current time of the corresponding cold storage reaches the set time, the refrigeration is started and refrigeration is performed on all selected cold storages.

[0139] And / or, the control unit 104 is further configured to, when the temperature mode of the refrigeration system is activated, control the compressor to start if the temperature of the current warehouse is higher than the set start temperature, so that the refrigeration system cools the current warehouse; and control the refrigeration equipment of the current warehouse to stop when the temperature of the current warehouse reaches the set stop temperature. The specific functions and processing of this control unit 104 are further described in step S630.

[0140] Specifically, such as Figure 10 As shown in (h), the temperature mode control flow includes: when the temperature mode is selected for the warehouse, if the detected warehouse temperature is higher than the start-up temperature, the compressor starts cooling, and the start-up process includes all selected warehouses. When the temperature of the selected warehouses is reached, each warehouse is shut down one by one.

[0141] In some embodiments, the cold storage control method of the present invention further includes:

[0142] The acquisition unit 102 is further configured to acquire the discharge pressure of the compressor when the refrigeration system is refrigerating the current warehouse. The specific functions and processing of the acquisition unit 102 are further described in step S710.

[0143] The control unit 104 is further configured to, if the compressor's discharge pressure exceeds a set pressure and / or the water pump malfunctions, switch the compressor's gear from the current gear to half of the current gear, then switch it from half of the current gear to 0 gear, then shut down the compressor, shut down the evaporator fan of the current warehouse, and close the intake valve of the current warehouse; after a sixth set time delay, close the return valve of the current warehouse. For the specific functions and processing of this control unit 104, please refer to step S720.

[0144] Specifically, such as Figure 10 As shown in (g), the compressor protection mechanism process includes: when the compressor discharge pressure exceeds the set value and / or the water pump fails, the compressor switching is changed from level 1 to level 1 / 2, from level 1 / 2 to level 0, then the compressor is shut down, the program stops running, all related fans and intake valves are turned off, and the return valve is turned off after a delay of 2 minutes.

[0145] Figure 11 The image in the middle shows the host computer interface of the automatic refrigeration control system after the unmanned transformation of a cold storage facility. Figure 11 The image shows the host computer interface of the automated refrigeration control system after the unmanned transformation of a cold storage facility. It has four cold storage units. After the water pump starts, water circulates to cool the compressor. Each cold storage unit has an inlet valve installed on its inlet pipes and a return valve installed on its outlet pipes. Each cold storage unit has multiple condenser fans, and the refrigerant passes through… Figure 11The blue liquid level tank shown in the image flows into each storage compartment from the bottom of the tank through a regulating valve. After the condenser fan starts, it cools the corresponding storage compartment.

[0146] The intelligent control system of fruit cold storage (i.e., the automatic refrigeration control system of cold storage) can be upgraded and intelligently improved by electrical automation on the basis of existing cold storage. By establishing a temperature control model of the intelligent control system of fruit cold storage, the activity of fruit is reduced after the fruit is put into storage, thereby greatly improving the freshness and storage time of fruit and solving the problem of fruit quality deterioration after long-term cold storage. This is of great significance to the upgrading of the fruit cold storage industry.

[0147] Cooling preservation based on this data model can improve the freshness of fruit during long-term storage. For example, before using this method, pears stored in cold storage for 6 months after harvesting had blackened and dried out at the stem end; after using this method and refrigeration system, the pear stem end remained green, just like when it was freshly picked, even after the same 6 months. See [link to relevant documentation] for details. Figure 15 The example shown. Figure 15 The diagrams show the effects of preserving fruit for six months on freshness, where (a) is a diagram of the effects of preserving fruit for six months in related solutions, and (b) is a diagram of the effects of preserving fruit for six months in the solution of the present invention.

[0148] The model takes the current temperature inside the cold storage as input, as well as the number of refrigeration cycles and the start time each day. After each refrigeration cycle ends, the stop temperature for the next start is reduced by 1 degree Celsius and divided by the number of refrigeration cycles. When the stop temperature for refrigeration decreases by 1 degree Celsius, the refrigeration ends for that day. This cycle continues until the temperature inside the cold storage and the stop temperature drop to -1°C. After that, the stop temperature for refrigeration is maintained at -1 degree Celsius every day.

[0149] The present invention refines and standardizes the manual refrigeration method based on experience, avoiding the influence of human factors on the refrigeration effect in manual refrigeration. By automatically refrigerating according to the standard temperature control curve, it can ensure that fruits remain fresh after long-term storage, greatly extending the shelf life.

[0150] Figure 12 This is a schematic diagram of the curve of cold storage refrigeration temperature changing over time in the cold storage refrigeration temperature control model. Figure 13 This is a remote process diagram illustrating an embodiment of an intelligent preservation method for fruit cold storage. Figure 13 As shown, users can control the PLC via a mobile app and touchscreen. The mobile app controls the PLC through a cloud server and cloud modules. Button switches, sensors, compressors, fans, water pumps, electric valves, regulating valves, etc., are all connected to the PLC. Sensors include: temperature sensors, humidity sensors, liquid level sensors, position sensors, etc.

[0151] The intelligent control system of the cold storage (i.e., the automatic refrigeration control system) monitors the internal environmental parameters and equipment status in real time by installing temperature sensors, humidity sensors, and liquid level sensors. The sensors transmit the collected data to the intelligent control system for processing and analysis. The intelligent control system uses a programmable logic controller (PLC) to collect field signals such as the cold storage temperature and compressor speed, controlling the compressor, water pump, and fan to complete the automatic refrigeration process, and cooling the cold storage according to a preset data model. Specifically, when collecting the cold storage temperature through the PLC, a PT100 resistance temperature detector (RTD) can be used as the temperature sensor. The resistance signal is converted into a 4-20mA signal by a transmitter, transmitted to the PLC, and then converted by an analog-to-digital converter (A / D converter) to obtain the temperature value, which is then used as the cold storage temperature.

[0152] like Figure 12 and Figure 13 As shown, taking the storage of Crown pears as an example, a cold storage refrigeration temperature control model is established. First, the cold storage room number requiring refrigeration is selected. During the storage period, the cold storage temperature is maintained at 13℃. Due to frequent personnel entry and exit during storage, the temperature inside the cold storage room rises quickly, requiring high-frequency refrigeration. The shutdown temperature is set at 13℃, and a temperature-based refrigeration mode is used. When the temperature is too high, refrigeration automatically starts; when the temperature drops to 13℃, refrigeration automatically stops. After the storage room is full, it needs to be sealed and cooled to reduce the pears' activity, thus extending their shelf life. At this time, the control system switches to automatic cooling mode, refrigerating five times a day, each time lowering the temperature by 0.2℃, gradually reducing the activity of the Crown pears and extending their shelf life. After several days of lowering the temperature, when it reaches -1℃, the cooling mode ends, the storage room is sealed, and the system switches to time-based refrigeration mode, performing timed refrigeration to maintain the cold storage temperature at -1℃. In automatic cooling mode, a system cooling model is established, and a program is written through the intelligent control system to control the cold storage according to this temperature model.

[0153] The present invention utilizes an intelligent temperature control system to monitor and regulate the temperature of the cold storage in real time, ensuring that the fruit is within the optimal temperature range and delaying the ripening and spoilage process. Simultaneously, it monitors and regulates the humidity of the cold storage to maintain a suitable humidity level, preventing the fruit from losing moisture and rotting. Through intelligent sensors and a monitoring system, parameters such as temperature, humidity, and gas concentration within the cold storage can be monitored in real time. By collecting the temperature data (i.e., the storage temperature) and the temperature difference between different locations within the storage, an early warning system detects abnormalities in advance and controls the automatic refrigeration control system and circulating fans to cool and balance the temperature within the storage, protecting the quality of the fruit. For example, when the collected temperature (i.e., the storage temperature) is below -1.5 degrees Celsius, and the temperature difference between the collected temperature and different areas within the storage is equal to 1.5 degrees Celsius, the circulating fans activate to lower the storage temperature and balance the temperature difference, preventing fruit (such as pears) from freezing. When the collected temperature (i.e., the storage temperature) is above 1 degree Celsius, the system automatically activates the automatic refrigeration control system to cool the storage.

[0154] In this invention, during the refrigeration process, a time-controlled temperature mode and a temperature-controlled temperature mode are set. When the fruit (e.g., pears) is stored in the cold storage during harvest season (after harvesting, the fruit needs to be boxed and placed in the cold storage), the fruit has high activity. The automatic refrigeration control system of the cold storage is used to control the temperature drop by setting an upper temperature limit, ensuring the fruit's activity continues to decrease. After the storage is sealed (e.g., a storage room is filled with pears and sealed for a long time for refrigeration and insulation), a time-controlled temperature mode is used to reduce energy consumption. By detecting temperature and other sensor parameters, when there is a large temperature difference or the temperature is too low inside the storage room, the fan is restarted. After the fan starts, the temperature is monitored in real time to achieve two stop modes: timed and temperature-difference-based, ensuring the fruit's temperature is balanced and preventing frost damage.

[0155] Since the processing and functions implemented by the device in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in the description of this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0156] According to an embodiment of the present invention, a cold storage facility corresponding to a control device for a cold storage facility is also provided. This cold storage facility may include the control device for a cold storage facility as described above.

[0157] Since the processing and functions implemented by the cold storage in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned devices, any details not covered in the description of this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0158] According to an embodiment of the present invention, a storage medium corresponding to a control method for a cold storage is also provided, the storage medium including a stored program, wherein the program controls the device where the storage medium is located to execute the control method for the cold storage described above when the program is running.

[0159] Since the processing and functions implemented by the storage medium in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0160] In summary, it is readily understood by those skilled in the art that, without conflict, the aforementioned advantageous methods can be freely combined and superimposed.

[0161] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A control method for a cold storage facility, characterized in that, The cold storage facility includes warehouses, and the number of warehouses is n, where n is a positive integer. A refrigeration system is provided to be compatible with the cold storage. The refrigeration system includes: a compressor, an evaporator, a condenser, and an expansion valve. The exhaust port of the compressor returns to the suction port of the compressor after passing through the condenser, the expansion valve, and the evaporator. Adapted to the compressor, a refrigerant tank, a refrigerant supply regulating valve, and a water pump are also provided. The compressor has different speed settings. A condenser fan is provided at the condenser. For each warehouse in the cold storage, an inlet valve, a return valve, and an evaporator fan are provided. Each warehouse has more than one evaporator fan. The control method for the cold storage includes: When it is necessary to start the refrigeration system, determine the warehouse in the cold storage that currently needs refrigeration and record it as the current warehouse; The system controls the water pump to start, and opens both the air inlet valve and the air return valve of the current warehouse. After a first set time delay, it controls the compressor to start. After another first set time delay, it controls the compressor to begin shifting gears, with a second set time delay after each gear shift. After the compressor is fully shifted, after a first set time delay, it controls the refrigeration equipment in the current warehouse to start one by one. Controlling the refrigeration equipment in the current warehouse includes: controlling one or more evaporator fans in the current warehouse to start. After one or more evaporator fans in the current warehouse have fully started, after a first set time delay, it controls the refrigerant supply regulating valve to open. After the regulating valve for supplying refrigerant is opened, the liquid level of the refrigerant tank is obtained and recorded as the current liquid level of the refrigerant tank; Based on the current liquid level in the refrigerant tank, the opening of the regulating valve supplying refrigerant is controlled to start the refrigeration system, so that the refrigeration system can cool the current warehouse. Also includes: In the cold storage, n warehouses are arranged in sequence; when the refrigeration system refrigerates the current warehouse, the temperature inside the current warehouse is obtained and recorded as the temperature of the current warehouse; If the current warehouse is not the last warehouse in the cold storage, and the temperature of the current warehouse reaches the set temperature, then when the temperature of the current warehouse reaches the set shutdown temperature, the air inlet valve of the current warehouse is closed, the evaporator fan of the current warehouse is turned off after a third set time delay, the evaporator fan of the current warehouse is turned on after a fourth set time delay, the return air valve of the current warehouse is turned off, and the evaporator fan of the current warehouse is turned off after a fifth set time delay. If the current warehouse is the last warehouse in the cold storage, and the temperature of the current warehouse reaches the set shutdown temperature, the regulating valve for supplying refrigerant is closed. After a sixth set time delay, the compressor is controlled to downshift until it reaches level 0. After the compressor runs in idle mode for a first set time, the compressor is controlled to stop. After a fifth set time delay, the air inlet valve of the current warehouse is closed, the water pump is turned off, and the evaporator is turned off. After another first set time delay, the refrigeration fan of the current warehouse is turned off. After another fourth set time delay, the refrigeration fan of the current warehouse is started and the return air valve of the current warehouse is closed. After another fifth set time delay, the refrigeration fan of the current warehouse is turned off, thereby shutting down the refrigeration system and stopping the refrigeration system from refrigerating the current warehouse.

2. The cold storage control method according to claim 1, characterized in that, Also includes: When the refrigeration system is refrigerating the current warehouse, the pressure of the return gas valve of the current warehouse is obtained; When the pressure of the return air valve in the current warehouse reaches the set pressure limit, the return air valve in the current warehouse is opened. Once the pressure of the return air valve in the current warehouse reaches below the set value, and after stabilizing for a first set time, the return air valve in the current warehouse is closed.

3. The cold storage control method according to claim 1, characterized in that, Also includes: When the refrigeration system is refrigerating the current warehouse, the discharge pressure of the compressor is obtained; The evaporator is started when the discharge pressure of the compressor is greater than or equal to the set pressure; If a command is received to stop the refrigeration system, the evaporator is shut down.

4. The cold storage control method according to claim 1, characterized in that, Also includes: When the refrigeration system is refrigerating the current warehouse, the temperature of the current warehouse is obtained; When the cooling mode of the refrigeration system has been activated, the refrigeration system is controlled to change according to the set temperature and the daily set temperature drop to determine the shutdown temperature of the refrigeration system. The refrigeration system will exit its cooling mode once the current warehouse temperature is less than or equal to a set temperature threshold.

5. The cold storage control method according to claim 1, characterized in that, Also includes: When the refrigeration system stops refrigerating the current warehouse, the time during which the refrigeration system did not refrigerate the current warehouse is obtained and recorded as the current time of the current warehouse. And / or, obtain the temperature inside the current warehouse and record it as the temperature of the current warehouse; If the current time of the refrigeration system has been activated in the time mode, and the current time of the current warehouse reaches the set time, then the refrigeration system is activated so that the refrigeration system can refrigerate the current warehouse. And / or, if the temperature mode of the refrigeration system is already activated, and the temperature of the current warehouse is higher than the set activation temperature, then the compressor is controlled to start so that the refrigeration system can refrigerate the current warehouse; The refrigeration equipment in the current warehouse will be shut down once the temperature of the current warehouse reaches the set shutdown temperature.

6. The control method for a cold storage facility according to any one of claims 1 to 5, characterized in that, Also includes: When the refrigeration system is refrigerating the current warehouse, the discharge pressure of the compressor is obtained; If the compressor's discharge pressure exceeds the set pressure and / or the water pump malfunctions, the compressor's gear is switched from the current gear to half of the current gear, then switched from half of the current gear to 0 gear. After that, the compressor is turned off, the evaporator fan of the current warehouse is turned off, and the air inlet valve of the current warehouse is closed. After a sixth set time delay, the return air valve of the current warehouse is closed.

7. A control device for a cold storage facility, characterized in that, The cold storage facility includes warehouses, and the number of warehouses is n, where n is a positive integer. A refrigeration system is provided to be compatible with the cold storage. The refrigeration system includes: a compressor, an evaporator, a condenser, and an expansion valve. The exhaust port of the compressor returns to the suction port of the compressor after passing through the condenser, the expansion valve, and the evaporator. Adapted to the compressor, a refrigerant tank, a refrigerant supply regulating valve, and a water pump are also provided. The compressor has different speed settings. A condenser fan is provided at the condenser. For each warehouse in the cold storage, an inlet valve, a return valve, and an evaporator fan are provided. Each warehouse has more than one evaporator fan. The control device of the cold storage includes: The control unit is configured to determine, when the refrigeration system needs to be started, the warehouse in the cold storage that currently needs refrigeration, denoted as the current warehouse; The control unit is further configured to control the water pump to start, and to open both the air inlet valve and the air return valve of the current warehouse; after a first set time delay, control the compressor to start; after another first set time delay, control the compressor to begin shifting gears, with a second set time delay after each gear shift; after the compressor is fully shifted, after a first set time delay, control the refrigeration equipment in the current warehouse to start one by one; wherein, controlling the refrigeration equipment in the current warehouse to start includes: controlling one or more evaporator fans in the current warehouse to start; after one or more evaporator fans in the current warehouse have fully started, after a first set time delay, control the refrigerant supply regulating valve to open; The acquisition unit is configured to acquire the liquid level of the refrigerant tank after the regulating valve for supplying refrigerant is opened, and record it as the current liquid level of the refrigerant tank; The control unit is also configured to control the opening of the refrigerant supply regulating valve according to the current liquid level of the refrigerant tank, so as to start the refrigeration system and enable the refrigeration system to refrigerate the current warehouse; The acquisition unit is further configured to, in the cold storage, arrange the n warehouses in sequence; when the refrigeration system refrigerates the current warehouse, acquire the temperature inside the current warehouse and record it as the temperature of the current warehouse; The control unit is further configured to, if the temperature of the current warehouse reaches a set temperature and the current warehouse is not the last warehouse in the cold storage, close the air inlet valve of the current warehouse, shut down the evaporator fan of the current warehouse after a third set time delay, start the evaporator fan of the current warehouse after a fourth set time delay, close the return air valve of the current warehouse, and shut down the evaporator fan of the current warehouse after a fifth set time delay. The control unit is further configured to, when the current warehouse is the last warehouse in the cold storage, and when the temperature of the current warehouse reaches the set shutdown temperature, close the refrigerant supply regulating valve, delay for a sixth set time, control the compressor to downshift until the compressor reaches 0, control the compressor to stop after the compressor has been running in idling for a first set time, delay for a fifth set time, close the intake valve of the current warehouse, close the water pump, and close the evaporator; delay for another first set time, close the refrigeration fan of the current warehouse, delay for another fourth set time, start the refrigeration fan of the current warehouse and close the return valve of the current warehouse, delay for another fifth set time and close the refrigeration fan of the current warehouse, thereby shutting down the refrigeration system and stopping the refrigeration system from refrigerating the current warehouse.

8. A cold storage facility, characterized in that, include: The control device for the cold storage as described in claim 7.

9. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the storage medium to perform the control method for the cold storage as described in any one of claims 1 to 6.

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