Control method, control device, double-circulation refrigerating system and storage medium

Abstract

The embodiment of the invention provides a control method, a control device, a double-circulation refrigeration system and a computer readable storage medium. The problem that a first one-way valve on a compressor bypass flow path generates abnormal noise after a fluorine pump refrigeration mode is shut down can be solved. The control method comprises the steps that a fluorine pump shutdown signal is detected in a fluorine pump refrigeration mode; and refrigerant transfer operation is executed to promote the refrigerant in the evaporator to be discharged into the condenser so as to reduce the amount of the liquid refrigerant in the evaporator.

Description

Technical Field

[0001] The present application relates to but is not limited to the technical field of refrigeration systems, and specifically refers to a fluorine pump starting method, a control device, a dual-circulation refrigeration system, and a computer-readable storage medium. Background Art

[0002] Since the equipment in the computer room generates a lot of heat and is in operation all year round, it needs to be cooled all year round. In order to save energy and reduce emissions, many air conditioner manufacturers have developed computer room air conditioners that use a compressor and a fluorine pump dual-circulation refrigeration system. In the summer when the outdoor temperature is high, the compressor refrigeration mode is mainly used; in the winter when the outdoor temperature is low, the fluorine pump refrigeration mode is mainly used to achieve the purpose of energy saving and emission reduction.

[0003] Due to the great energy efficiency advantage, computer room air conditioners with fluorine pump natural cooling function have developed rapidly. When the series computer room air conditioner (i.e. the compressor and the fluorine pump are connected in series) is running in the fluorine pump cooling mode, it is necessary to open the compressor bypass flow path to bypass the compressor. The compressor bypass flow path is provided with a first one-way valve. After the first one-way valve is shut down in the fluorine pump cooling mode, an abnormal sound often occurs, and the abnormal sound lasts for a long time. Most of the existing industry technologies ignore this problem. Summary of the invention

[0004] The technical problem to be solved by the present application is to provide a control method, a control device, a dual-circulation refrigeration system and a computer-readable storage medium, which can improve the problem of abnormal noise generated by the first one-way valve on the bypass flow path of the compressor after the fluorine pump refrigeration mode is shut down.

[0005] To this end, an embodiment of the present application provides a control method for a dual-cycle refrigeration system, the control method comprising:

[0006] The fluorine pump shutdown signal is detected in the fluorine pump cooling mode;

[0007] The refrigerant transfer operation is performed to cause the refrigerant in the evaporator to be discharged into the condenser to reduce the amount of liquid refrigerant in the evaporator.

[0008] The control method provided in the embodiment of the present application can perform a refrigerant transfer operation after detecting a fluorine pump shutdown signal in the fluorine pump refrigeration mode, so as to cause the refrigerant in the evaporator to be discharged into the condenser, thereby reducing the amount of liquid refrigerant in the evaporator. This can reduce the duration of the evaporation of the liquid refrigerant in the evaporator after the fluorine pump is shut down, thereby reducing the duration of the abnormal sound emitted by the first one-way valve, and improving the problem of the abnormal sound generated by the diaphragm vibration of the first one-way valve.

[0009] Based on the above technical solution, the present application can also be improved as follows.

[0010] In an exemplary embodiment, performing the refrigerant transfer operation includes:

[0011] The fluorine pump is turned off and the compressor is started, so that the refrigerant in the evaporator is discharged into the condenser through the compressor.

[0012] In an exemplary embodiment, the performing of the refrigerant transfer operation further includes: closing a throttling device.

[0013] In an exemplary embodiment, the performing of the refrigerant transfer operation further includes:

[0014] Controlling the speed of the condensing fan to a first set speed; and / or

[0015] The speed of the evaporating fan is controlled to be a second set speed.

[0016] In an exemplary embodiment, the performing of the refrigerant transfer operation further includes:

[0017] Based on the first setting condition being met, the compressor is turned off.

[0018] In an exemplary embodiment, the first setting condition includes at least one of the following:

[0019] The suction pressure of the compressor reaches a set suction pressure range;

[0020] The operating time of the compressor reaches a first set time range.

[0021] In an exemplary embodiment, in the step of starting the compressor, the compressor is controlled to start at a third set speed.

[0022] In an exemplary embodiment, performing the refrigerant transfer operation includes:

[0023] The fluorine pump is controlled to maintain the current rotation speed, and the opening of the throttling device is gradually reduced, so that the refrigerant in the evaporator is discharged into the condenser through the compressor bypass flow path.

[0024] In an exemplary embodiment, the performing of the refrigerant transfer operation further includes:

[0025] Controlling the speed of the condensing fan to a fourth set speed; and / or

[0026] The speed of the evaporating fan is controlled to be the fifth set speed.

[0027] In an exemplary embodiment, the performing of the refrigerant transfer operation further includes:

[0028] When the second setting condition is satisfied, the fluorine pump is turned off.

[0029] In an exemplary embodiment, the second setting condition includes at least one of the following:

[0030] The opening of the throttling device is reduced to a set opening;

[0031] The head of the fluorine pump is reduced to a set head range;

[0032] Since the refrigerant transfer operation is started, the running time of the fluorine pump reaches a second set time range.

[0033] In an exemplary embodiment, the control method further includes:

[0034] Determining whether the dual-cycle refrigeration system enters a standby state;

[0035] Based on determining that the dual-cycle refrigeration system enters a standby state, the step of performing the refrigerant transfer operation is performed.

[0036] An embodiment of the present application further provides a control device, including a processor and a memory storing a computer program, wherein the processor implements the steps of the control method described in any one of the above embodiments when executing the computer program.

[0037] An embodiment of the present application also provides a dual-circulation refrigeration system, characterized in that it includes a control device as described in the above embodiment.

[0038] An embodiment of the present application further provides a computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements a control method as described in any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of the structure of a dual-cycle refrigeration system provided in some embodiments of the present application;

[0040] Figure 2 A flow chart of a control method provided in some embodiments of the present application;

[0041] Figure 3 A flow chart of a control method provided by an embodiment of the present application;

[0042] Figure 4 A flow chart of a control method provided in another embodiment of the present application;

[0043] Figure 5 A flowchart of a control method provided in yet another embodiment of the present application.

[0044] Figure 6 A flowchart of a control method provided in yet another embodiment of the present application.

[0045] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0046] Figure 1 The parts represented by the various reference numerals are listed as follows:

[0047] 1 condenser, 2 condensing fan, 3 liquid storage tank, 4 fluorine pump, 5 second one-way valve, 6 throttling device, 7 evaporator, 8 evaporating fan, 9 first one-way valve, 10 compressor, 11 compressor bypass flow path, 12 fluorine pump bypass flow path. DETAILED DESCRIPTION

[0048] The principles and features of the present application are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present application and are not used to limit the scope of the present application.

[0049] An embodiment of the present application provides a control method for a dual-cycle refrigeration system.

[0050] like Figure 1 As shown, the dual-cycle refrigeration system may include: a compressor 10, a condenser 1, a liquid storage tank 3, a fluorine pump 4, a throttling device 6 and an evaporator 7 connected by pipelines to form a loop; a condensing fan 2 corresponding to the condenser 1, and an evaporating fan 8 corresponding to the evaporator 7; a compressor bypass flow path 11 connected in parallel with the compressor 10 and a first one-way valve 9 provided on the compressor bypass flow path 11; a fluorine pump bypass flow path 12 connected in parallel with the fluorine pump 4 and a second one-way valve 5 provided on the fluorine pump bypass flow path 12. The first one-way valve 9 is configured to be unidirectionally conducted in the direction from the outlet of the evaporator 7 to the inlet of the condenser 1. The second one-way valve 5 is configured to be unidirectionally conducted in the direction from the outlet of the condenser 1 to the inlet of the evaporator 7. A liquid storage tank 3 may also be provided between the outlet of the condenser 1 and the fluorine pump 4. The evaporator 7 and the evaporating fan 8 are located on the indoor side, and the condenser 1 and the condensing fan 2 are located on the outdoor side. The throttling device 6 may be, but is not limited to, an electronic expansion valve.

[0051] The dual-cycle refrigeration system can be set to have the following three refrigeration modes: compressor refrigeration mode, mixed refrigeration mode, and fluorine pump refrigeration mode. The working principles of each refrigeration mode are as follows:

[0052] Compressor refrigeration mode: the first check valve 9 is closed and the second check valve 5 is open. The refrigerant flows through the compressor 10, the condenser 1, the liquid storage tank 3, the fluorine pump bypass flow path 12, the throttling device 6 and the evaporator 7 in sequence to form a first circulation loop. In this refrigeration mode, the fluorine pump 4 is stopped and the compressor 10 is started to provide power for the refrigeration operation of the system.

[0053] Mixed refrigeration mode: the first check valve 9 is closed, and the second check valve 5 is closed. The refrigerant flows through the compressor 10, the condenser 1, the liquid storage tank 3, the fluorine pump 4, the throttling device 6 and the evaporator 7 in sequence to form a second circulation loop. In this refrigeration mode, the fluorine pump 4 and the compressor 10 are both started, and the outdoor natural cold source is partially used. The fluorine pump 4 can compensate for the circulation power of the refrigerant in the system, reduce the pressure loss of the refrigerant during the circulation process, make the compressor 10 work under the best working condition, reduce the energy consumption of the compressor 10, improve the refrigeration efficiency, and have a certain energy-saving effect.

[0054] Fluorine pump refrigeration mode: the first one-way valve 9 is turned on, and the second one-way valve 5 is turned off. Figure 1 As shown, the refrigerant flows through the compressor bypass flow path 11, the condenser 1, the liquid storage tank 3, the fluorine pump 4, the throttling device 6 and the evaporator 7 in sequence to form a third circulation loop. In this refrigeration mode, the fluorine pump 4 is started and the compressor 10 is stopped, making full use of the outdoor natural cold source, and using the fluorine pump 4 instead of the compressor 10 to provide power for the system cycle. Since the power of the fluorine pump 4 is much smaller than that of the compressor 10, it can significantly reduce the power consumption of the computer room air conditioner, which has a significant energy-saving effect.

[0055] Research has found that the reason why the first one-way valve 9 produces abnormal sound and the abnormal sound lasts for a long time after the fluorine pump refrigeration mode is shut down is that the first one-way valve 9 often adopts a diaphragm one-way valve for energy efficiency considerations. After the fluorine pump refrigeration mode is shut down, the refrigerant in the evaporator 7 will continue to evaporate, causing the first one-way valve 9 to repeatedly open and close, causing the diaphragm to vibrate and produce abnormal sound. Since the liquid refrigerant content in the evaporator 7 is high in the fluorine pump refrigeration mode, the refrigerant in the evaporator 7 will continue to evaporate for a long time after the fluorine pump 4 is shut down, causing the abnormal sound of the first one-way valve 9 to last for a long time.

[0056] For this reason, Figure 2 As shown, an embodiment of the present application provides a control method, including:

[0057] Step S202: a fluorine pump shutdown signal is detected in a fluorine pump cooling mode;

[0058] Step S204: Execute a refrigerant transfer operation to cause the refrigerant in the evaporator to be discharged into the condenser to reduce the amount of liquid refrigerant in the evaporator.

[0059] The control method provided in the embodiment of the present application can perform a refrigerant transfer operation after detecting a fluorine pump shutdown signal in the fluorine pump refrigeration mode, so as to cause the refrigerant in the evaporator 7 to be discharged into the condenser 1, thereby reducing the amount of liquid refrigerant in the evaporator 7. This can reduce the duration of the evaporation of the liquid refrigerant in the evaporator 7 after the fluorine pump 4 is shut down, thereby reducing the duration of the abnormal sound emitted by the first one-way valve 9, thereby improving the problem of the abnormal sound generated by the diaphragm vibration of the first one-way valve 9.

[0060] In some exemplary embodiments, before step S204, the control method further includes:

[0061] Determine whether the dual-cycle refrigeration system enters the standby state; if so, execute step S204; if not, turn off the fluorine pump 4 according to normal logic.

[0062] When the fluorine pump shutdown signal is detected in the fluorine pump refrigeration mode, there are generally two situations: 1) The fluorine pump refrigeration mode can meet the current refrigeration requirements, and the current indoor temperature reaches the set temperature requirement. The whole machine can enter the standby state. After the indoor temperature rises to a certain temperature, the whole machine enters the fluorine pump refrigeration mode again for refrigeration; 2) The fluorine pump refrigeration mode cannot meet the current refrigeration requirements, and the system needs to switch to the compressor refrigeration mode for refrigeration. Therefore, the fluorine pump shutdown signal can be automatically generated by the control device according to a preset program when the current indoor temperature reaches the set temperature requirement in the fluorine pump refrigeration mode; it can also be automatically generated by the control device according to a preset program when the fluorine pump refrigeration mode needs to be switched to the compressor refrigeration mode. When the control device generates the fluorine pump shutdown signal, the fluorine pump shutdown signal is detected synchronously.

[0063] In the first case, after the system enters the standby state, most of the moving parts will stop running, so the abnormal sound problem of the first one-way valve 9 will be more obvious, which will bring a bad experience to the user and may cause customer complaints.

[0064] In the second case, since the system does not stop but is only switched to the compressor cooling mode, the noise of the whole machine is relatively large, and the abnormal noise of the first check valve 9 can be ignored. In addition, after the compressor 10 is turned on, the compressor bypass flow path 11 is closed, and the refrigerant discharged from the evaporator 7 will not enter the first check valve 9.

[0065] Therefore, when it is determined that the dual-circulation refrigeration system has entered the standby state, the refrigerant transfer operation is performed to improve the abnormal sound problem of the first one-way valve 9 during the standby process and improve the user experience. When it is determined that the system has not entered the standby state, there is no need to perform the refrigerant transfer operation, and the fluorine pump 4 is directly turned off to switch the system to the compressor refrigeration mode.

[0066] In some exemplary embodiments, performing a refrigerant transfer operation includes:

[0067] The fluorine pump 4 is turned off, and the compressor 10 is started, so that the refrigerant in the evaporator 7 is discharged into the condenser 1 through the compressor 10 .

[0068] This solution mainly realizes the transfer of refrigerant by controlling the fluorine pump 4 and the compressor 10. When the fluorine pump 4 is turned off and the compressor 10 is started, the pressure at the suction port of the compressor 10 is relatively low, which facilitates the rapid evaporation of the refrigerant in the evaporator 7; while the pressure at the exhaust port of the compressor 10 is relatively high, so the first one-way valve 9 is closed, disconnecting the compressor bypass flow path 11. In this way, the liquid refrigerant in the evaporator 7 can be quickly evaporated into gaseous refrigerant, discharged into the condenser 1 through the compressor 10, condensed and released heat in the condenser 1 to become liquid refrigerant, thus realizing the transfer of refrigerant.

[0069] In some embodiments, performing the refrigerant transfer operation further includes: closing the throttling device 6 .

[0070] After the throttling device 6 is closed, the liquid refrigerant in the system can be prevented from entering the evaporator 7 through the throttling device 6, and the evaporator 7 can be prevented from replenishing new liquid refrigerant after the fluorine pump 4 is shut down, which is conducive to the rapid reduction of the liquid refrigerant in the evaporator 7. This solution is equivalent to turning on the compressor 10 to evacuate the evaporator 7 after the fluorine pump 4 ends its operation, so that the liquid refrigerant in the evaporator 7 can be quickly evaporated and transferred to the condenser 1, so that there is almost no liquid refrigerant in the evaporator 7, which can significantly improve the abnormal sound problem of the first one-way valve 9 during the standby process.

[0071] In some embodiments, performing the refrigerant transfer operation further includes: controlling the speed of the condensing fan 2 to a first set speed. The first set speed is a relatively low speed of the condensing fan 2, such as the minimum speed of the condensing fan 2, or a low speed higher than the minimum speed.

[0072] The rotation speed of the condensing fan 2 will affect the condensing pressure of the condenser 1. The higher the rotation speed of the condensing fan 2, the lower the condensing pressure of the condenser 1. The condensing pressure of the condenser 1 will affect the startup of the compressor 10 in an outdoor low-temperature environment, and the fluorine pump refrigeration mode usually works in an outdoor low-temperature environment. When the condensing pressure of the condenser 1 is too low, it will be difficult to establish a pressure difference between the inlet and outlet of the compressor 10, resulting in difficulty in starting the compressor 10. Therefore, the condensing fan 2 runs at the first set speed, which is conducive to the normal startup of the compressor 10.

[0073] In some embodiments, performing the refrigerant transfer operation further includes: controlling the speed of the evaporation fan 8 to a second set speed. The second set speed is a relatively high speed of the evaporation fan 8, such as the maximum speed of the evaporation fan 8, or a high speed lower than the maximum speed.

[0074] This is conducive to prompting the liquid refrigerant in the evaporator 7 to evaporate quickly, and further conducive to quickly reducing the amount of liquid refrigerant in the evaporator 7.

[0075] In some embodiments, performing the refrigerant transfer operation further includes: shutting down the compressor 10 based on the first set condition being met.

[0076] When the first set condition is met, it indicates that the liquid refrigerant in the evaporator 7 has been basically transferred, and the first one-way valve 9 will not produce abnormal noise due to repeated vibration of the diaphragm, so the compressor 10 can be turned off.

[0077] In one example, the first set condition may be that the suction pressure of the compressor 10 reaches a set suction pressure range.

[0078] The suction pressure of the compressor 10 can be recorded as Ph. The suction pressure range can be set to be less than a preset suction pressure, and the preset suction pressure can be recorded as Ph_set. Then the first setting condition can be: Ph<Ph_set. The size of Ph_set can be reasonably set as needed, and can be within the range of 0.1MPa to 0.5MPa, such as 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa, 0.5MPa, etc.

[0079] When the suction pressure of the compressor 10 reaches the set suction pressure range, it indicates that the suction pressure of the compressor 10 is already very low, and the gaseous refrigerant formed by evaporation in the evaporator 7 is already very small, so the liquid refrigerant in the evaporator 7 is also very small and can be ignored. Therefore, the first one-way valve 9 will not make abnormal noise due to the vibration of the diaphragm, and the compressor 10 can be turned off at this time.

[0080] In another example, the first set condition may be that the operating time of the compressor 10 reaches a first set time range.

[0081] The operation time of the compressor 10 can be recorded as ty. The first set time range can be: greater than the first set time, the first set time can be recorded as t1_set, and the first set condition can be ty>t1_set. The size of t1_set can be reasonably set as needed, and can be in the range of 10s to 120s, such as 10s, 30s, 60s, 90s, 120s, etc.

[0082] As the compressor 10 runs, the liquid refrigerant in the evaporator 7 will gradually decrease. When the running time of the compressor 10 reaches the first set time range, it indicates that the liquid refrigerant in the evaporator 7 is very little and can be ignored. Therefore, the first one-way valve 9 will not make abnormal sounds due to the vibration of the diaphragm, and the compressor 10 can be turned off at this time.

[0083] In other examples, the first setting condition may also be: Ph<Ph_set and ty>t1_set. Alternatively, the first setting condition may also be: Ph<Ph_set or ty>t1_set.

[0084] In other words, for the first setting condition: the conditions in the above examples can be used individually, combined and used in an "or" manner, or combined and used in an "and" manner.

[0085] In some embodiments, the control method further comprises: based on the first setting condition being met, turning off the condensing fan 2 and the evaporating fan 8, and the whole machine entering the standby state. The condensing fan 2 and the evaporating fan 8 can be turned off according to conventional logic.

[0086] In some embodiments, in the step of starting the compressor 10, the compressor 10 is controlled to start at a third set speed. The third set speed is a relatively low speed of the compressor 10, such as the lowest speed of the compressor 10, or a low speed higher than the lowest speed.

[0087] This is beneficial for the quick and stable startup of the compressor 10 and can reduce energy consumption while meeting the refrigerant transfer requirements.

[0088] In some other exemplary embodiments, performing a refrigerant transfer operation includes:

[0089] The fluorine pump 4 is controlled to maintain the current rotation speed, and the opening of the throttling device 6 is reduced, so that the refrigerant in the evaporator 7 is discharged into the condenser 1 through the compressor bypass flow path 11.

[0090] In this case, the compressor 10 remains in a closed state, and the refrigerant discharged from the evaporator 7 drives the first one-way valve 9 to open, thereby connecting the compressor bypass flow path 11 and allowing the refrigerant to be discharged into the condenser 1 through the compressor bypass flow path 11.

[0091] In some embodiments, reducing the opening of the throttling device 6 includes: gradually reducing the opening of the throttling device 6. As for the way of gradually reducing the opening of the throttling device 6, there is no limitation. For example, the opening of the throttling device 6 can be reduced linearly with time, and the opening of the throttling device 6 is linearly related to time; or, the opening of the throttling device 6 can also be reduced nonlinearly with time, for example, the opening of the throttling device 6 can be quadratic function relationship, cubic function relationship, etc.

[0092] This solution mainly realizes the transfer of refrigerant by controlling the fluorine pump 4 and the throttling device 6.

[0093] By maintaining the current speed of the fluorine pump 4 and the throttling device 6 in the open state, the power to drive the liquid refrigerant in the evaporator 7 to flow out can be provided. By reducing the opening of the throttling device 6, the amount of liquid refrigerant entering the evaporator 7 can be reduced, which is also conducive to promoting the evaporation of the liquid refrigerant in the evaporator 7. In this way, the refrigerant in the evaporator 7 can be discharged quickly, but the refrigerant entering the evaporator 7 is very small, so the amount of liquid refrigerant in the evaporator 7 will be reduced quickly.

[0094] In some embodiments, performing the refrigerant transfer operation further includes: controlling the rotation speed of the condensing fan 2 to be a fourth set rotation speed. The fourth set rotation speed is higher than the first set rotation speed. The fourth set rotation speed is a relatively high rotation speed of the condensing fan 2, such as the maximum rotation speed of the condensing fan 2, and of course, it can also be a high rotation speed lower than the maximum rotation speed.

[0095] This helps to reduce the pressure of the condenser 1 , thereby facilitating the refrigerant in the evaporator 7 to be quickly discharged into the condenser 1 .

[0096] In some embodiments, performing the refrigerant transfer operation further includes: controlling the speed of the evaporation fan 8 to be a fifth set speed. The fifth set speed may be equal to the second set speed. The fifth set speed is a relatively high speed of the evaporation fan 8, such as the maximum speed of the evaporation fan 8, and of course, it may also be a high speed lower than the maximum speed.

[0097] This is conducive to prompting the liquid refrigerant in the evaporator 7 to evaporate quickly, and further conducive to quickly reducing the amount of liquid refrigerant in the evaporator 7.

[0098] In some embodiments, performing the refrigerant transfer operation further includes: closing the fluorine pump 4 based on the second set condition being met.

[0099] When the second setting condition is met, it indicates that the liquid refrigerant in the evaporator 7 has been basically transferred, and the first one-way valve 9 will not produce abnormal noise due to repeated vibration of the diaphragm, so the fluorine pump 4 can be closed.

[0100] In one example, the second setting condition may be that the opening of the throttling device 6 is reduced to a set opening. The set opening is a relatively small opening of the throttling device 6, such as a set minimum opening of the throttling device 6, or a small opening greater than the set minimum opening.

[0101] The opening of the throttling device 6 can be recorded as EEV, the set minimum opening can be recorded as EEV_min, EEV_min>0, then the second setting condition can be: EEV=EEV_min. EEV_min can be determined by the structure and setting of the throttling device 6 itself.

[0102] When the opening of the throttling device 6 is reduced to the set minimum opening, it indicates that the opening of the throttling device 6 can hardly be reduced any further. At this time, the pressure of the evaporator 7 is very low, and it is difficult for the liquid refrigerant to remain in the evaporator 7. Therefore, the amount of liquid refrigerant in the evaporator 7 is very small and can be ignored. Therefore, the first one-way valve 9 will not make abnormal sounds due to the vibration of the diaphragm, and the fluorine pump 4 can be turned off at this time.

[0103] In another example, the second set condition may be: the head of the fluorine pump 4 is reduced to a set head range.

[0104] Among them, the head of the fluorine pump 4 can be recorded as △H, and the set head range can be: less than or equal to the preset minimum head, the preset minimum head can be recorded as △H_min, and the second set operating condition can be: △H≤△H_min, △H_min can be determined by the structure and setting of the fluorine pump 4 itself.

[0105] When the lift of the fluorine pump 4 is reduced to the set lift range, it indicates that the pressure of the condenser 1 is very low, and the refrigerant in the evaporator 7 has basically been sucked into the condenser 1, so the amount of liquid refrigerant in the evaporator 7 is very small and can be ignored. Therefore, the first one-way valve 9 will not make abnormal sounds due to the vibration of the diaphragm, and the fluorine pump 4 can be closed at this time.

[0106] In another example, the second setting condition may be: since the execution of the refrigerant transfer operation, the operation time of the fluorine pump 4 reaches a second setting time range.

[0107] Among them, since the refrigerant transfer operation is started, the running time of the fluorine pump 4 can be recorded as tf, and the second set time range can be: greater than or equal to the second set time, the second set time can be recorded as t2, and the second set operating condition can be: tf≥t2, t2 can be reasonably set as needed, and can be in the range of but not limited to 10s to 180s, such as 10s, 30s, 60s, 90s, 120s, 150s, 180s, etc.

[0108] As the fluorine pump 4 runs, the liquid refrigerant in the evaporator 7 will gradually decrease. When the running time of the fluorine pump 4 reaches the second set time range, it indicates that the liquid refrigerant in the evaporator 7 is very little and can be ignored. Therefore, the first one-way valve 9 will not make abnormal sounds due to the vibration of the diaphragm, and the fluorine pump 4 can be turned off at this time.

[0109] In other examples, the second set operating condition may also be: EEV=EEV_min or △H≤△H_min. Alternatively, the second set operating condition may also be: EEV=EEV_min and △H≤△H_min. Alternatively, the second set operating condition may also be: EEV=EEV_min or tf≥t2. Alternatively, the second set operating condition may also be: EEV=EEV_min and tf≥t2. Alternatively, the second set operating condition may also be: △H≤△H_min or tf≥t2. Alternatively, the second set operating condition may also be: △H≤△H_min and tf≥t2.

[0110] In other words, for the second setting condition: the conditions in the above examples can be used individually, combined and used in an "or" manner, or combined and used in an "and" manner.

[0111] In some embodiments, the control method further comprises: based on the second setting condition being satisfied, shutting down the condensing fan 2, the evaporating fan 8 and the throttling device 6, and the whole machine entering the standby state. The condensing fan 2, the evaporating fan 8 and the throttling device 6 can be shut down according to conventional logic.

[0112] In one embodiment, Figure 3 As shown, the control method includes the following steps:

[0113] Step S302: a fluorine pump shutdown signal is detected in the fluorine pump refrigeration mode.

[0114] Step S304: Determine whether the system enters the standby state; if so, execute step S306; if not, execute step S312.

[0115] Step S306: turn off the fluorine pump, start the compressor and set the speed of the compressor to the third set speed, turn off the throttling device, control the speed of the condensing fan to the first set speed, and the speed of the evaporating fan to the second set speed.

[0116] Step S308: Determine whether Ph<Ph_set or ty>t1_set is established; if so, execute step S310; if not, return to execute step S308.

[0117] Step S310: Turn off the compressor, condensing fan, and evaporating fan.

[0118] Step S312: Turn off the fluorine pump according to conventional logic.

[0119] In another embodiment, Figure 4 As shown, the control method includes the following steps:

[0120] Step S402: a fluorine pump shutdown signal is detected in the fluorine pump refrigeration mode.

[0121] Step S404: Determine whether the system enters the standby state; if so, execute step S406; if not, execute step S410.

[0122] Step S406: turn off the fluorine pump, start the compressor and set the speed of the compressor to the third set speed, turn off the throttling device, control the speed of the condensing fan to the first set speed, and the speed of the evaporating fan to the second set speed.

[0123] Step S408: based on the first set running time of the compressor, turning off the compressor, the condensing fan, and the evaporating fan.

[0124] Step S410: Turn off the fluorine pump according to conventional logic.

[0125] The first set time length is in the range of 10s to 180s.

[0126] In yet another embodiment, Figure 5 As shown, the control method includes the following steps:

[0127] Step S502: a fluorine pump shutdown signal is detected in the fluorine pump refrigeration mode.

[0128] Step S505: Determine whether the system enters the standby state; if so, execute step S506; if not, execute step S512.

[0129] Step S506: Control the fluorine pump to maintain the current speed fp, gradually reduce the opening EEV of the throttling device, control the speed of the condensing fan to the fourth set speed, and the speed of the evaporating fan to the fifth set speed.

[0130] Step S508: Determine whether the EEV is reduced to the set opening or whether ΔH is reduced to the set lift range; if so, execute step S510; if not, return to execute step S508.

[0131] Step S510: turn off the fluorine pump, throttling device, condensing fan, and evaporating fan.

[0132] Step S512: Turn off the fluorine pump according to conventional logic.

[0133] In yet another embodiment, Figure 6 As shown, the control method includes the following steps:

[0134] Step S602: a fluorine pump shutdown signal is detected in the fluorine pump refrigeration mode.

[0135] Step S606: Determine whether the system enters the standby state; if so, execute step S606; if not, execute step S612.

[0136] Step S606: Control the fluorine pump to maintain the current speed fp, gradually reduce the opening EEV of the throttling device, control the speed of the condensing fan to the fourth set speed, and the speed of the evaporating fan to the fifth set speed.

[0137] Step S608: Based on the refrigerant transfer operation being executed, the fluorine pump runs for a second set time, and the fluorine pump, the throttling device, the condensing fan, and the evaporating fan are turned off.

[0138] Step S610: Turn off the fluorine pump according to conventional logic.

[0139] The second set time length is in the range of 10s to 180s.

[0140] An embodiment of the present application also provides a control device, including a processor and a memory storing a computer program. When the processor executes the computer program, the steps of the control method in any of the above embodiments are implemented, and thus all the above-mentioned beneficial effects are achieved, which will not be repeated here.

[0141] The processor may be an integrated circuit chip with signal processing capabilities. The above-mentioned processor may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0142] The embodiment of the present application also provides a dual-circulation refrigeration system, including a control device as in the above embodiment, and thus has all the above-mentioned beneficial effects, which will not be repeated here.

[0143] The embodiment of the present application further provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the fluorine pump starting method as in any one of the above embodiments is implemented, thus having all the above-mentioned beneficial effects, which will not be repeated here.

[0144] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and steps, and therefore should not be understood as a limitation on the present application.

[0145] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0146] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0147] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0148] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0149] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

[0150] In any one or more of the above exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on a computer-readable medium or transmitted via a computer-readable medium as one or more instructions or codes, and executed by a hardware-based processing unit. A computer-readable medium may include a computer-readable storage medium corresponding to a tangible medium such as a data storage medium, or a communication medium that facilitates a computer program, such as any medium transmitted from one place to another according to a communication protocol. In this way, a computer-readable medium may generally correspond to a non-temporary tangible computer-readable storage medium or a communication medium such as a signal or carrier wave. A data storage medium may be any available medium that can be accessed by one or more computers or one or more processors to retrieve instructions, codes, and / or data structures for implementing the technology described in the present disclosure. A computer program product may include a computer-readable medium.

[0151] By way of example and not limitation, such computer-readable storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage, flash memory, or any other medium that can be used to store the desired program code in the form of instructions or data structures and can be accessed by a computer. Moreover, any connection may also be referred to as a computer-readable medium. For example, if instructions are transmitted from a website, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio and microwave are included in the definition of medium. However, it should be understood that computer-readable storage media and data storage media do not include connections, carrier waves, signals, or other transient (transient) media, but are directed to non-transient tangible storage media. As used herein, disks and optical disks include compact disks (CDs), laser disks, optical disks, digital versatile disks (DVDs), floppy disks, or Blu-ray disks, etc., where disks typically reproduce data magnetically, while optical disks use lasers to reproduce data optically. Combinations of the above should also be included within the scope of computer-readable media.

[0152] For example, instructions may be executed by one or more processors such as one or more digital signal processors (DSPs), general purpose microprocessors, application specific integrated circuits (ASICs), field programmable logic arrays (FPGAs), or other equivalent integrated or discrete logic circuits. Thus, the term "processor" as used herein may refer to any of the above structures or any other structures suitable for implementing the techniques described herein. Additionally, in some aspects, the functionality described herein may be provided within dedicated hardware and / or software modules configured for encoding and decoding, or incorporated in a combined codec. Also, the techniques may be fully implemented in one or more circuits or logic elements.

[0153] The technical solutions of the embodiments of the present disclosure can be implemented in a wide variety of devices or equipment, including wireless mobile phones, integrated circuits (ICs) or a group of ICs (e.g., chipsets). Various components, modules or units are described in the embodiments of the present disclosure to emphasize the functional aspects of the devices configured to perform the described techniques, but they do not necessarily need to be implemented by different hardware units. Instead, as described above, the various units can be combined in a codec hardware unit or provided by a collection of inter-step hardware units (including one or more processors as described above) in combination with suitable software and / or firmware.

Claims

1. A control method for a dual-cycle refrigeration system, characterized in that: The control method comprises: The fluorine pump shutdown signal is detected in the fluorine pump cooling mode; The refrigerant transfer operation is performed to cause the refrigerant in the evaporator to be discharged into the condenser to reduce the amount of liquid refrigerant in the evaporator.

2. The control method according to claim 1, characterized in that: The performing of the refrigerant transfer operation includes: The fluorine pump is turned off and the compressor is started, so that the refrigerant in the evaporator is discharged into the condenser through the compressor.

3. The control method according to claim 2, characterized in that: The performing of the refrigerant transfer operation also includes: closing the throttling device.

4. The control method according to claim 2, characterized in that: The performing of the refrigerant transfer operation further includes: Controlling the speed of the condensing fan to a first set speed; and / or The speed of the evaporating fan is controlled to be a second set speed.

5. The control method according to claim 2, characterized in that: The performing of the refrigerant transfer operation further includes: Based on the first setting condition being met, the compressor is turned off.

6. The control method according to claim 5, characterized in that: The first setting condition includes at least one of the following: The suction pressure of the compressor reaches a set suction pressure range; The operating time of the compressor reaches a first set time range.

7. The control method according to claim 2, characterized in that: In the step of starting the compressor, the compressor is controlled to start at a third set speed.

8. The control method according to claim 1, characterized in that: The performing of the refrigerant transfer operation includes: The fluorine pump is controlled to maintain the current rotation speed, and the opening of the throttling device is gradually reduced, so that the refrigerant in the evaporator is discharged into the condenser through the compressor bypass flow path.

9. The control method according to claim 8, characterized in that: The performing of the refrigerant transfer operation further includes: Controlling the speed of the condensing fan to a fourth set speed; and / or The speed of the evaporating fan is controlled to be the fifth set speed.

10. The control method according to claim 8, characterized in that: The performing of the refrigerant transfer operation further includes: When the second setting condition is satisfied, the fluorine pump is turned off.

11. The control method according to claim 10, characterized in that: The second setting condition includes at least one of the following: The opening of the throttling device is reduced to a set opening; The head of the fluorine pump is reduced to a set head range; Since the refrigerant transfer operation is started, the running time of the fluorine pump reaches a second set time range.

12. The control method according to any one of claims 1 to 11, characterized in that: Also includes: Determining whether the dual-cycle refrigeration system enters a standby state; Based on determining that the dual-cycle refrigeration system enters a standby state, the step of performing the refrigerant transfer operation is performed.

13. A control device, characterized in that: The system comprises a processor and a memory storing a computer program, wherein when the processor executes the computer program, the steps of the control method according to any one of claims 1 to 12 are implemented.

14. A dual-cycle refrigeration system, characterized in that: Comprising a control device as claimed in claim 13.

15. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the control method according to any one of claims 1 to 12 is implemented.

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