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

Abstract

Embodiments of the present application provide a control method, a control device, a double-circulation refrigeration system and a computer readable storage medium, which can improve the problem of abnormal sound of the first one-way valve on the compressor bypass flow path after the fluorine pump refrigeration mode is stopped. The control method comprises: detecting a fluorine pump shutdown signal in the fluorine pump refrigeration mode; performing a refrigerant transfer operation to promote the refrigerant in the evaporator to be discharged into the condenser to reduce the amount of liquid refrigerant in the evaporator.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration systems, and particularly relates to a fluorine pump starting method, a control device, a double-circulation refrigeration system and a computer readable storage medium. BACKGROUND

[0002] Because the equipment in the machine room generates a large amount of heat and is operated 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 a machine room air conditioner using a double-circulation refrigeration system with a compressor and a fluorine pump. In the case of high outdoor temperature in summer, the compressor refrigeration mode is mainly used; in the case of low outdoor temperature in winter, the fluorine pump refrigeration mode is mainly used, so as to achieve the purpose of energy saving and emission reduction.

[0003] Due to the great energy efficiency advantage, the machine room air conditioner with the fluorine pump natural cooling function develops rapidly. The series connection type machine room air conditioner (i.e., the compressor and the fluorine pump are connected in series) needs to turn on the bypass flow path of the compressor to bypass the compressor when the fluorine pump refrigeration mode is operated, and a first one-way valve is arranged on the bypass flow path of the compressor. The first one-way valve often produces abnormal sound after the fluorine pump refrigeration mode is stopped, and the duration of the abnormal sound is relatively long. The existing industry technology mostly ignores this problem. SUMMARY

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

[0005] To this end, the present application provides a control method for a double-circulation refrigeration system, which comprises the following steps:

[0006] detecting a fluorine pump shutdown signal in the fluorine pump refrigeration mode;

[0007] performing a refrigerant transfer operation to promote the refrigerant in the evaporator to be discharged into the condenser, so as to reduce the amount of liquid refrigerant in the evaporator.

[0008] The control method provided by the present application can perform a refrigerant transfer operation after detecting a fluorine pump shutdown signal in the fluorine pump refrigeration mode, promote the refrigerant in the evaporator to be discharged into the condenser, and thus reduce the amount of liquid refrigerant in the evaporator. In this way, the duration of the liquid refrigerant evaporation phenomenon in the evaporator after the fluorine pump is shut down can be reduced, so that the duration of the abnormal sound emitted by the first one-way valve can be reduced, and the problem of abnormal sound produced by the first one-way valve due to the vibration of the diaphragm can be improved.

[0009] On the basis of the above technical solution, the present application can be further improved as follows.

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

[0011] Turning off the fluorine pump and starting the compressor to discharge the refrigerant in the evaporator into the condenser through the compressor.

[0012] In an exemplary embodiment, the performing the refrigerant transfer operation further comprises turning off the throttling device.

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

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

[0015] Controlling the rotation speed of the evaporator fan to be a second set rotation speed.

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

[0017] Turning off the compressor based on the first set condition being met.

[0018] In an exemplary embodiment, the first set condition comprises at least one of:

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

[0020] The running 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 be started at a third set rotation speed.

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

[0023] Controlling the fluorine pump to maintain a current rotation speed, gradually reducing the opening degree of the throttling device, and discharging the refrigerant in the evaporator into the condenser through the compressor bypass flow path.

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

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

[0026] Controlling the rotation speed of the evaporator fan to be a fifth set rotation speed.

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

[0028] Turning off the fluorine pump based on the second set condition being met.

[0029] In an exemplary embodiment, the second set condition comprises at least one of:

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

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

[0032] the running time of the fluorine pump reaches a second set time range since the execution of the refrigerant transfer operation.

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

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

[0035] based on determining that the dual-cycle refrigeration system enters the standby state, executing the step of performing the refrigerant transfer operation.

[0036] The embodiments of the present application also provide a control device, comprising a processor and a memory storing a computer program, the processor implements the steps of the control method according to any one of the above embodiments when executing the computer program.

[0037] The embodiments of the present application also provide a dual-cycle refrigeration system, characterized by comprising the control device according to any one of the above embodiments.

[0038] The embodiments of the present application also provide a computer readable storage medium storing a computer program, the computer program is executed by a processor to implement the control method according to any one of the above embodiments. BRIEF DESCRIPTION OF DRAWINGS

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

[0040] Figure 2 a flowchart of a control method provided by some embodiments of the present application;

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

[0042] Figure 4 a flowchart of a control method provided by another embodiment of the present application;

[0043] Figure 5 a flowchart of a control method provided by still another embodiment of the present application.

[0044] Figure 6 a flowchart of a control method provided by still another embodiment of the present application.

[0045] In the drawings, the components represented by the numbers are listed as follows:

[0046] Figure 1 The list of components represented by each number is as follows:

[0047] 1. Condenser, 2. Condenser fan, 3. Liquid receiver, 4. Refrigerant pump, 5. Second check valve, 6. Throttling device, 7. Evaporator, 8. Evaporator fan, 9. First check valve, 10. Compressor, 11. Compressor bypass path, 12. Refrigerant pump bypass path. Detailed Implementation

[0048] The principles and features of this application are described below with reference to the accompanying drawings. The examples given are only for explaining this application and are not intended to limit the scope of this application.

[0049] This 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 receiver 3, a refrigerant pump 4, a throttling device 6, and an evaporator 7 connected by pipelines to form a loop; a condenser fan 2 corresponding to the condenser 1 and an evaporator fan 8 corresponding to the evaporator 7; a compressor bypass flow path 11 connected in parallel with the compressor 10 and a first check valve 9 located in the compressor bypass flow path 11; a refrigerant pump bypass flow path 12 connected in parallel with the refrigerant pump 4 and a second check valve 5 located in the refrigerant pump bypass flow path 12. The first check valve 9 is configured to unidirectionally open in the direction of flow from the outlet of the evaporator 7 to the inlet of the condenser 1. The second check valve 5 is configured to unidirectionally open in the direction of flow from the outlet of the condenser 1 to the inlet of the evaporator 7. A liquid receiver 3 may also be installed between the outlet of the condenser 1 and the refrigerant pump 4. The evaporator 7 and the evaporator fan 8 are located on the indoor side, and the condenser 1 and the condenser 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, hybrid refrigeration mode, and refrigerant pump refrigeration mode. The working principle of each refrigeration mode is as follows:

[0052] Compressor refrigeration mode: First one-way valve 9 is closed, and second one-way valve 5 is open. The refrigerant flows sequentially through compressor 10, condenser 1, receiver 3, refrigerant pump bypass path 12, throttling device 6, and evaporator 7, forming the first circulation loop. In this refrigeration mode, refrigerant pump 4 stops, and compressor 10 starts, providing power for the system's refrigeration operation.

[0053] Hybrid refrigeration mode: The first one-way valve 9 is closed, and the second one-way valve 5 is closed. The refrigerant flows sequentially through the compressor 10, condenser 1, receiver 3, refrigerant pump 4, throttling device 6, and evaporator 7, forming a second circulation loop. In this refrigeration mode, both the refrigerant pump 4 and the compressor 10 are started, partially utilizing outdoor natural cold sources. The refrigerant pump 4 can compensate for the circulation dynamics of the refrigerant in the system, reducing the pressure loss of the refrigerant during circulation, allowing the compressor 10 to operate under optimal conditions, reducing the energy consumption of the compressor 10, improving refrigeration efficiency, and achieving a certain energy-saving effect.

[0054] Refrigerant pump refrigeration mode: First one-way valve 9 is open, second one-way valve 5 is closed. For example... Figure 1 As shown, the refrigerant flows sequentially through the compressor bypass path 11, condenser 1, receiver 3, refrigerant pump 4, throttling device 6, and evaporator 7, forming a third circulation loop. In this cooling mode, refrigerant pump 4 starts while compressor 10 stops, making full use of the outdoor natural cold source. Refrigerant pump 4 replaces compressor 10 to provide power for the system circulation. Since the power of refrigerant pump 4 is much smaller than that of compressor 10, the power consumption of the computer room air conditioner can be significantly reduced, resulting in significant energy-saving effects.

[0055] The study found that the reason why the first one-way valve 9 produces abnormal noise and lasts for a long time after the refrigerant pump refrigeration mode is that, for energy efficiency reasons, the first one-way valve 9 is usually a diaphragm-type one-way valve. After the refrigerant pump refrigeration mode is stopped, the refrigerant in the evaporator 7 continues to evaporate, causing the first one-way valve 9 to repeatedly open and close, resulting in diaphragm vibration and abnormal noise. Because the liquid refrigerant content in the evaporator 7 is high in the refrigerant pump refrigeration mode, the refrigerant in the evaporator 7 continues to evaporate for a long time after the refrigerant pump 4 stops, resulting in the prolonged duration of abnormal noise from the first one-way valve 9.

[0056] Therefore, such as Figure 2 As shown in the embodiment of this application, a control method is provided, including:

[0057] Step S202: A refrigerant pump shutdown signal is detected in refrigerant pump cooling mode;

[0058] Step S204: Perform a refrigerant transfer operation to discharge the refrigerant in the evaporator into the condenser, thereby reducing the amount of liquid refrigerant in the evaporator.

[0059] The control method provided in this application, upon detecting a refrigerant pump shutdown signal in refrigerant pump refrigeration mode, can perform a refrigerant transfer operation, causing 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 reduces the duration of liquid refrigerant evaporation in the evaporator 7 after the refrigerant pump 4 is shut down, thus reducing the duration of abnormal noise emitted by the first one-way valve 9, and further improving the problem of abnormal noise caused by diaphragm vibration in the first one-way valve 9.

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

[0061] determining whether the dual-cycle refrigeration system enters the standby state; if yes, performing step S204; if no, closing the fluorine pump 4 according to normal logic.

[0062] In the fluorine pump refrigeration mode, two situations are generally detected for the fluorine pump shutdown signal: 1) the fluorine pump refrigeration mode can meet the current refrigeration requirement, and the current indoor temperature reaches the set temperature requirement, so that the whole machine enters the standby state, and the whole machine enters the fluorine pump refrigeration mode again for refrigeration when the indoor temperature rises to a certain temperature; 2) the fluorine pump refrigeration mode cannot meet the current refrigeration requirement, 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 the preset program when the current indoor temperature reaches the set temperature requirement in the fluorine pump refrigeration mode; or the fluorine pump shutdown signal can be automatically generated by the control device according to the 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] For the first situation, after the system enters the standby state, most moving parts stop running, so the abnormal sound problem of the first check valve 9 is more obvious, which brings a bad experience to the user and may cause customer complaints.

[0064] For the second situation, since the system does not stop, but only switches to the compressor refrigeration mode, the noise of the whole machine is relatively large, and the abnormal sound problem of the first check valve 9 can be ignored. In addition, after the compressor 10 is started, 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-cycle refrigeration system enters the standby state, the refrigerant transfer operation is performed to improve the abnormal sound problem of the first check valve 9 in the standby process and improve the user experience. When it is determined that the system does not enter the standby state, the refrigerant transfer operation is not performed, and the fluorine pump 4 is directly closed to switch the system to the compressor refrigeration mode.

[0066] In some exemplary embodiments, the refrigerant transfer operation comprises:

[0067] The fluorine pump 4 is closed, 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] The present scheme mainly realizes the transfer of refrigerant through the control of the fluorine pump 4 and the compressor 10. When the fluorine pump 4 is closed and the compressor 10 is started, the suction port pressure of the compressor 10 is small, which is beneficial to the rapid evaporation of the refrigerant in the evaporator 7; and the discharge port pressure of the compressor 10 is large, so the first check valve 9 is closed, and the compressor bypass flow path 11 is disconnected. In this way, the liquid refrigerant in the evaporator 7 can be rapidly evaporated into gaseous refrigerant, discharged into the condenser 1 through the compressor 10, condensed and heat-released into liquid refrigerant in the condenser 1, and the transfer of refrigerant is realized.

[0069] In some embodiments, the refrigerant transfer operation is also performed, further comprising: 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 new liquid refrigerant can be prevented from being supplemented in the evaporator 7 after the fluorine pump 4 is turned off, thereby facilitating the rapid reduction of the liquid refrigerant in the evaporator 7. The scheme is equivalent to starting the compressor 10 to perform vacuum pumping after the fluorine pump 4 is turned off, which can make the liquid refrigerant in the evaporator 7 evaporate rapidly and be transferred to the condenser 1, so that there is almost no liquid refrigerant in the evaporator 7, thereby significantly improving the abnormal sound problem of the first check valve 9 during standby.

[0071] In some embodiments, the refrigerant transfer operation is also performed, further comprising: controlling the rotational speed of the condenser fan 2 to be a first set rotational speed. The first set rotational speed is a relatively low rotational speed of the condenser fan 2, which can be the lowest rotational speed of the condenser fan 2, and of course can also be a low rotational speed higher than the lowest rotational speed.

[0072] The rotational speed of the condenser fan 2 will affect the condensing pressure of the condenser 1, and the higher the rotational speed of the condenser 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 a low-temperature outdoor environment, and the fluorine pump refrigeration mode usually works in a low-temperature outdoor 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 difficult startup of the compressor 10. Therefore, the condenser fan 2 operates at the first set rotational speed, which is beneficial to the normal startup of the compressor 10.

[0073] In some embodiments, the refrigerant transfer operation is also performed, further comprising: controlling the rotational speed of the evaporator fan 8 to be a second set rotational speed. The second set rotational speed is a relatively high rotational speed of the evaporator fan 8, which can be the highest rotational speed of the evaporator fan 8, and of course can also be a high rotational speed lower than the highest rotational speed.

[0074] In this way, it is beneficial to promote the rapid evaporation of the liquid refrigerant in the evaporator 7, and further beneficial to the rapid reduction of the amount of liquid refrigerant in the evaporator 7.

[0075] In some embodiments, the refrigerant transfer operation is also performed, further comprising: based on the first set condition being established, closing the compressor 10.

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

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

[0078] Wherein, the suction pressure of the compressor 10 can be denoted as Ph. The set suction pressure range can be less than a preset suction pressure, which can be denoted as Ph_set. Therefore, the first set condition can be Ph < Ph_set. The size of Ph_set can be reasonably set as needed, which can be in but not limited to the range of 0.1 MPa to 0.5 MPa, such as 0.1 MPa, 0.2 MPa, 0.3 MPa, 0.4 MPa, 0.5 MPa, 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 also very small. Therefore, the liquid refrigerant in the evaporator 7 is also very small and can be ignored. Therefore, the first one-way valve 9 will not produce abnormal sound due to the vibration of the diaphragm, and the compressor 10 can be closed at this time.

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

[0081] Wherein, the running time of the compressor 10 can be denoted as ty. The first set time range can be greater than a first set time, which can be denoted as t1_set. Therefore, the first set condition can be ty > t1_set. The size of t1_set can be reasonably set as needed, which can be in but not limited to the range of 10 s to 120 s, such as 10 s, 30 s, 60 s, 90 s, 120 s, etc.

[0082] With the running of the compressor 10, 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 small and can be ignored. Therefore, the first one-way valve 9 will not produce abnormal sound due to the vibration of the diaphragm, and the compressor 10 can be closed at this time.

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

[0084] In other words, for the first set of conditions: the conditions in the above example, they can be used individually, or in combination and in the "or" way, or in combination and in the "and" way.

[0085] In some embodiments, the control method further comprises: based on the first set of conditions being met, turning off the condenser fan 2 and the evaporator fan 8, and the entire machine enters a standby state. The condenser fan 2 and the evaporator fan 8 can be turned off according to the 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, which can be the lowest speed of the compressor 10, or of course a low speed higher than the lowest speed.

[0087] In this way, it is beneficial to quickly and stably start the compressor 10, and it is beneficial to reduce energy consumption on the basis of meeting the refrigerant transfer demand.

[0088] In other exemplary embodiments, performing the refrigerant transfer operation comprises:

[0089] Controlling the fluorine pump 4 to maintain the current speed and reducing the opening degree of the throttling device 6 to make the refrigerant in the evaporator 7 flow into the condenser 1 through the compressor bypass flow path 11.

[0090] In this case, the compressor 10 remains closed, the first one-way valve 9 is opened by the refrigerant discharged from the evaporator 7, the compressor bypass flow path 11 is conducted, and the refrigerant is discharged into the condenser 1 through the compressor bypass flow path 11.

[0091] In some embodiments, reducing the opening degree of the throttling device 6 comprises gradually reducing the opening degree of the throttling device 6. As for the way of gradually reducing the opening degree of the throttling device 6, it is not limited. For example, the opening degree of the throttling device 6 can be linearly reduced over time, and the opening degree of the throttling device 6 is linearly related to time; or the opening degree of the throttling device 6 can also be non-linearly reduced over time, such as a quadratic function relationship, a cubic function relationship, etc.

[0092] The scheme 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 degree of the throttling device 6, the amount of liquid refrigerant entering the evaporator 7 can be reduced, and it is also beneficial to promote the evaporation of the liquid refrigerant in the evaporator 7. In this way, the refrigerant in the evaporator 7 can be quickly discharged, but very little refrigerant enters the evaporator 7, so the amount of liquid refrigerant in the evaporator 7 will quickly decrease.

[0094] In some embodiments, performing the refrigerant transfer operation further comprises: controlling the rotation speed of the condenser fan 2 to 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 condenser fan 2, which can be the highest rotation speed of the condenser fan 2, or a high rotation speed lower than the highest rotation speed.

[0095] This is advantageous 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 comprises: controlling the rotation speed of the evaporator fan 8 to a fifth set rotation speed. The fifth set rotation speed can be equal to the second set rotation speed. The fifth set rotation speed is a relatively high rotation speed of the evaporator fan 8, which can be the highest rotation speed of the evaporator fan 8, or a high rotation speed lower than the highest rotation speed.

[0097] This is advantageous to facilitate the liquid refrigerant in the evaporator 7 to be quickly evaporated, thereby facilitating the amount of liquid refrigerant in the evaporator 7 to be quickly reduced.

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

[0099] When the second set condition is met, it indicates that the liquid refrigerant in the evaporator 7 is basically transferred, and the first check valve 9 will not produce abnormal sound due to repeated vibration of the diaphragm, so the fluorine pump 4 can be turned off.

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

[0101] Wherein, the opening degree of the throttling device 6 can be denoted as EEV, and the set minimum opening degree can be denoted as EEV_min, EEV_min>0, and the second set 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 degree of the throttling device 6 is reduced to the set minimum opening degree, it indicates that the opening degree of the throttling device 6 has almost cannot be reduced, at this time the pressure of the evaporator 7 is very low, and the liquid refrigerant is difficult to remain in the evaporator 7, so the amount of liquid refrigerant in the evaporator 7 is very small and can be ignored. Therefore, the first check valve 9 will not produce abnormal sound due to vibration of the diaphragm, and the fluorine pump 4 can be turned off at this time.

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

[0104] Wherein, the head of the fluorine pump 4 can be denoted as AH, the set head range can be: less than or equal to the preset minimum head, the preset minimum head can be denoted as AH_min, and the second set operating condition can be: AH≤AH_min, which can be determined by the structure and setting of the fluorine pump 4 itself.

[0105] When the head of the fluorine pump 4 decreases to the set head range, it indicates that the pressure of the condenser 1 is very low, and the refrigerant in the evaporator 7 has been basically 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 emit abnormal sound due to the vibration of the diaphragm, and the fluorine pump 4 can be closed at this time.

[0106] In yet another example, the second set condition can be: the running time of the fluorine pump 4 reaches a second set time range since the refrigerant transfer operation is performed.

[0107] Wherein, the running time of the fluorine pump 4 since the refrigerant transfer operation is performed can be denoted as tf, and the second set time range can be: greater than or equal to a second set time, which can be denoted as t2, and the second set operating condition can be: tf≥t2, which can be reasonably set according to needs, 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] With the operation of the fluorine pump 4, 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 small and can be ignored. Therefore, the first one-way valve 9 will not emit abnormal sound due to the vibration of the diaphragm, and the fluorine pump 4 can be closed at this time.

[0109] In other examples, the second set operating condition can also be: EEV=EEV_min or AH≤AH_min. Alternatively, the second set operating condition can also be: EEV=EEV_min and AH≤AH_min. Alternatively, the second set operating condition can also be: EEV=EEV_min or tf≥t2. Alternatively, the second set operating condition can also be: EEV=EEV_min and tf≥t2. Alternatively, the second set operating condition can also be: AH≤AH_min or tf≥t2. Alternatively, the second set operating condition can also be: AH≤AH_min and tf≥t2.

[0110] In other words, for the second set condition: the conditions in the above examples can be used individually, or in combination and in the form of "or", or in combination and in the form of "and".

[0111] In some embodiments, the control method further comprises: based on the second set condition being met, turning off the condenser fan 2, the evaporator fan 8 and the throttling device 6, and then the entire system enters a standby state. The condenser fan 2, the evaporator fan 8 and the throttling device 6 can be turned off according to the conventional logic.

[0112] In one embodiment, as shown in Figure 3 the control method comprises the following steps:

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

[0114] Step S304: determining whether the system enters a standby state; if yes, executing step S306; if no, executing step S312.

[0115] Step S306: turning off the fluorine pump, starting the compressor with a third set speed, turning off the throttling device, controlling the speed of the condenser fan to be a first set speed, and controlling the speed of the evaporator fan to be a second set speed.

[0116] Step S308: determining whether Ph < Ph_set or ty > t1_set is met; if yes, executing step S310; if no, returning to execute step S308.

[0117] Step S310: turning off the compressor, the condenser fan and the evaporator fan.

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

[0119] In another embodiment, as shown in Figure 4 the control method comprises the following steps:

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

[0121] Step S404: determining whether the system enters a standby state; if yes, executing step S406; if no, executing step S410.

[0122] Step S406: turning off the fluorine pump, starting the compressor with a third set speed, turning off the throttling device, controlling the speed of the condenser fan to be a first set speed, and controlling the speed of the evaporator fan to be a second set speed.

[0123] Step S408: based on the compressor running for a first set duration, turning off the compressor, the condenser fan and the evaporator fan.

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

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

[0126] In yet another embodiment, as shown in Figure 5 The control method comprises the following steps:

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

[0128] Step S505: determining whether the system enters the standby state; if yes, executing step S506; if no, executing step S512.

[0129] Step S506: controlling the fluorine pump to maintain the current rotating speed fp, gradually reducing the opening degree EEV of the throttling device, controlling the rotating speed of the condenser fan to be the fourth set rotating speed, and controlling the rotating speed of the evaporator fan to be the fifth set rotating speed.

[0130] Step S508: determining whether the EEV is reduced to the set opening degree or the △H is reduced to the set head range; if yes, executing step S510; if no, returning to execute step S508.

[0131] Step S510: shutting down the fluorine pump, the throttling device, the condenser fan, and the evaporator fan.

[0132] Step S512: shutting down the fluorine pump according to the conventional logic.

[0133] In yet another embodiment, as shown in Figure 6 The control method comprises the following steps:

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

[0135] Step S606: determining whether the system enters the standby state; if yes, executing step S606; if no, executing step S612.

[0136] Step S606: controlling the fluorine pump to maintain the current rotating speed fp, gradually reducing the opening degree EEV of the throttling device, controlling the rotating speed of the condenser fan to be the fourth set rotating speed, and controlling the rotating speed of the evaporator fan to be the fifth set rotating speed.

[0137] Step S608: based on the fluorine pump running for a second set time length since the refrigerant transfer operation is executed, shutting down the fluorine pump, the throttling device, the condenser fan, and the evaporator fan.

[0138] Step S610: shutting down the fluorine pump according to the conventional logic.

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

[0140] The embodiments of the present application also provide a control device, which comprises a processor and a memory storing a computer program, and the processor implements the steps of the control method of any of the above embodiments when executing the computer program, thus having all the beneficial effects of the above, which will not be repeated here.

[0141] The processor can be an integrated circuit chip with signal processing capability. The processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), or the like. The processor can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, discrete hardware component. The methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed by the processor. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0142] The embodiment of the present application also provides a double-circulation refrigeration system comprising the control device as described above, thus having all the beneficial effects described above, which will not be repeated here.

[0143] The embodiment of the present application also provides a computer readable storage medium storing a computer program, and the computer program is executed by a processor to implement the fluorine pump starting method according to any one of the above embodiments, thus having all the beneficial effects described above, which will not be repeated here.

[0144] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and steps, therefore, cannot be understood as limiting the present application.

[0145] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0146] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", "fixedly connected" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless specifically defined otherwise. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0147] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature can be 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, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0148] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the present application 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 limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

[0150] In any one or more of the example embodiments described above, the functions described can be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions can be stored on or transmitted over as one or more instructions or code on a computer-readable medium and executed by a hardware-based processing unit. Computer-readable media can include computer-readable storage media, which corresponds to a tangible medium such as data storage media, or communication media including any medium that facilitates transfer of a computer program from one place to another, e.g., according to a communication protocol. In this manner, computer- readable media generally can correspond to non-transitory computer-readable storage media that is tangible or communication media such as a signal or carrier wave. Data storage media can be any available media that can be accessed by one or more computers or one or more processors to retrieve instructions, code and / or data structures for implementation of the techniques described in this disclosure. A computer program product can include a computer-readable medium.

[0151] By way of example, and not limitation, such computer-readable storage media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage, or other magnetic storage devices, flash memory, or any other storage medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer. Also, any

[0152] Instructions can 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 circuitry. Accordingly, the term "processor," as used herein can refer to any of the foregoing structure or any other structure suitable for implementation of the techniques described herein. In addition, in some aspects, the functionality described herein can be provided within dedicated hardware and / or software modules configured for encoding and decoding, or incorporated in a combined codec. Also, the techniques could 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 apparatuses, including a wireless handset, an integrated circuit (IC) or a set of ICs (e.g., a chip set). Various components, modules, or units are described in the embodiments of the present disclosure to emphasize functionality of the device configured to perform the described techniques, but it can not necessarily require that each of the described components, modules, or units be implemented by separate hardware. Rather, the various components, modules, or 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 conjunction with suitable software and / or firmware.

Claims

1. A control method for a dual-cycle refrigeration system, characterized in that, The control method includes: A refrigerant pump shutdown signal was detected in refrigerant pump cooling mode; Perform a refrigerant transfer operation to discharge the refrigerant in the evaporator into the condenser, thereby reducing the amount of liquid refrigerant in the evaporator; The refrigerant transfer operation includes: Turn off the refrigerant pump and start the compressor so that the refrigerant in the evaporator is discharged into the condenser through the compressor.

2. The control method according to claim 1, characterized in that, The refrigerant transfer operation also includes: shutting off the throttling device.

3. The control method according to claim 1, characterized in that, The refrigerant transfer operation also includes: Control the condenser fan speed to the first set speed; and / or The speed of the evaporator fan is controlled to the second set speed.

4. The control method according to claim 1, characterized in that, The refrigerant transfer operation also includes: If the first set condition is met, the compressor is turned off.

5. The control method according to claim 4, characterized in that, The first setting condition includes at least one of the following: The compressor's suction pressure reaches the set suction pressure range; The compressor runs for a period of time that reaches a first set time range.

6. The control method according to claim 1, characterized in that, In the step of starting the compressor, the compressor is controlled to start at a third set speed.

7. A control method for a dual-cycle refrigeration system, characterized in that, The control method includes: A refrigerant pump shutdown signal was detected in refrigerant pump cooling mode; Perform a refrigerant transfer operation to discharge the refrigerant in the evaporator into the condenser, thereby reducing the amount of liquid refrigerant in the evaporator; The refrigerant transfer operation includes: Control the refrigerant pump to maintain the current speed, and gradually reduce the opening of the throttling device so that the refrigerant in the evaporator is discharged into the condenser through the compressor bypass path.

8. The control method according to claim 7, characterized in that, The refrigerant transfer operation also includes: Control the condenser fan speed to the fourth set speed; and / or The speed of the evaporator fan is controlled to the fifth set speed.

9. The control method according to claim 7, characterized in that, The refrigerant transfer operation also includes: If the second precondition is met, shut down the refrigerant pump.

10. The control method according to claim 9, 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 the set head range; From the start of the refrigerant transfer operation, the operating time of the fluorine pump reaches the second set time range.

11. The control method according to any one of claims 1 to 10, characterized in that, Also includes: Determine whether the dual-cycle cooling system has entered standby mode; Based on the determination that the dual-cycle refrigeration system has entered standby mode, the step of performing the refrigerant transfer operation is executed.

12. A control device, characterized in that, It includes a processor and a memory storing a computer program, wherein the processor executes the computer program to implement the steps of the control method as described in any one of claims 1 to 11.

13. A dual-cycle refrigeration system, characterized in that, Includes the control device as described in claim 12.

14. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the control method as described in any one of claims 1 to 11.

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