Fluorine pump restart method, control device, dual-circulation refrigeration system and storage medium

Abstract

The embodiment of the present application provides a fluorine pump restart method, a control device, a dual-circulation refrigeration system and a storage medium. The fluorine pump restart method can be used in a dual-circulation refrigeration system, and is characterized in that the fluorine pump restart method includes: after receiving an instruction to restart the fluorine pump due to a flow interruption, controlling the condensing fan to run at a first preset speed and turning off the fluorine pump; based on the time for the condensing fan to run at the first preset speed reaching the first preset time, controlling the condensing fan to run at a second preset speed, and controlling the fluorine pump to start at a third preset speed; wherein the second preset speed is less than the first preset speed. The fluorine pump restart method realizes the rapid recovery of the fluorine pump after the flow interruption by starting the fluorine pump at a high frequency after a short period of cold blowing. The fluorine pump restart method has the advantages of wide applicable temperature, short time consumption, no need for a compressor, and high success rate.

Description

Technical Field

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

[0002] Due to the huge advantage of centrifugal pumps in terms of lifespan, existing fluorine pump natural cooling units in computer room air conditioners often use centrifugal pumps as refrigerant transportation devices. However, when the refrigerant at the centrifugal pump inlet is vaporized, it is very easy for the centrifugal pump to lose its head due to the failure of liquid sealing, resulting in flow interruption. In addition, due to the presence of the liquid storage tank, the supercooling degree of the pump inlet is low. When the environment changes extremely, it is difficult to completely avoid the fluorine pump flow interruption.

[0003] Existing technologies generally adopt multiple attempts to restart the fluorine pump, or compressor-assisted starting to restart the fluorine pump, but these methods have disadvantages such as low success rate at ultra-low temperatures and reliability risks of ultra-low temperature operation of the compressor. Summary of the Invention

[0004] The present application provides a fluorine pump restart method, a control device, a dual-circulation refrigeration system and a computer-readable storage medium. By starting the fluorine pump at high frequency after a short period of cold blowing, the fluorine pump can be quickly recovered after a flow interruption. The fluorine pump restart method has the advantages of wide applicable temperature, short time consumption, no need for a compressor, and high success rate.

[0005] The embodiment of the present application provides a fluorine pump restart method for a dual-circulation refrigeration system, characterized in that the fluorine pump restart method includes:

[0006] After receiving the instruction to restart the fluorine pump due to flow interruption, the condensing fan is controlled to run at a first preset speed and the fluorine pump is turned off;

[0007] Based on the time period during which the condensing fan runs at the first preset speed reaching the first preset time period, controlling the condensing fan to run at a second preset speed, and controlling the fluorine pump to start at a third preset speed;

[0008] Wherein, the second preset speed is smaller than the first preset speed.

[0009] In some exemplary embodiments, the fluorine pump restarting method further includes:

[0010] While the condensing fan is controlled to operate at the first preset speed, the evaporating fan is controlled to operate at a fourth preset speed.

[0011] In some exemplary embodiments, the fluorine pump restarting method further includes:

[0012] Based on the time period during which the condensing fan operates at the first preset speed reaching the first preset time period, controlling the evaporating fan to operate at the fourth preset speed or the fifth preset speed;

[0013] Wherein, the fifth preset speed is less than the fourth preset speed.

[0014] In some exemplary embodiments, the fluorine pump restarting method further includes:

[0015] Based on the time period during which the condensing fan runs at the first preset speed reaching the first preset time period, the opening of the throttling device is controlled to be the first preset opening.

[0016] In some exemplary embodiments, the fluorine pump restarting method further includes:

[0017] While controlling the condensing fan to run at a first preset speed and shutting down the fluorine pump, the throttling device is closed, or the opening of the throttling device is controlled to be a second preset opening.

[0018] In some exemplary embodiments, the first preset speed is 30%-100% of the rated speed of the condensing fan;

[0019] The second preset speed is not higher than 70% of the minimum speed rated speed of the condensing fan; and / or

[0020] The third preset speed is the rated speed of the fluorine pump, or the speed when the operating frequency of the fluorine pump is 40 Hz-80 Hz.

[0021] In some exemplary embodiments, the fourth preset speed is the rated speed of the evaporating fan; and / or

[0022] The fifth preset speed is the minimum speed of the evaporation fan.

[0023] In some exemplary embodiments, the first preset opening is 75%-100% of the maximum opening of the throttling device; and / or

[0024] The second preset opening is 12%-80% of the maximum opening of the throttling device.

[0025] In some exemplary embodiments, the first preset duration is determined based on the indoor and outdoor temperature difference, or is a fixed duration.

[0026] In some exemplary embodiments, the first preset duration is set to be positively correlated with the indoor and outdoor temperature difference.

[0027] An embodiment of the present application further provides a control device, comprising a processor and a memory storing a computer program, wherein the processor implements the steps of the above-mentioned fluorine pump restarting method when executing the computer program.

[0028] An embodiment of the present application also provides a dual-circulation refrigeration system, including the above-mentioned control device.

[0029] An embodiment of the present application further provides a computer-readable storage medium storing a computer program, which implements the above-mentioned fluorine pump restart method when executed by a processor.

[0030] The fluorine pump restart method provided in the embodiment of the present application is mainly divided into two stages in the process of restarting after the fluorine pump is cut off: a cooling stage and a startup stage. In the cooling stage, the condensing fan runs at a relatively high speed so that the outdoor air flows through the condenser quickly, the refrigerant in the condenser is quickly cooled, and the cooling time is shortened. When the refrigerant temperature in the condenser is reduced to close to the ambient temperature, on the one hand, the gas-liquid two-phase refrigerant in the liquid storage tank after the last cut-off is fully condensed to a liquid state, and on the other hand, the direction of change of the temperature and pressure of the liquid storage tank after the fluorine pump is started is from low to high. During the change process, the response of the pressure increase in the liquid storage tank is faster than the temperature response, so that the refrigerant in the liquid storage tank is in a supercooled state in the dynamic process, thereby avoiding the fluorine pump inlet being in an unstable two-phase state caused by the refrigerant dynamic process being in an overheated state when the temperature and pressure change from high to low, so as to prevent the problem of cut-off at the fluorine pump inlet due to refrigerant vaporization during the startup phase. During the startup phase, reducing the speed of the condensing fan can reduce the degree of vaporization caused by the change in the condenser speed during the startup process, and controlling the fluorine pump to start at a higher speed (the third preset speed), thereby enhancing the self-priming ability of the fluorine pump inlet for the refrigerant, and improving the success rate of the fluorine pump startup. The restart time is short, and no compressor is required, thus avoiding the reliability risk of the compressor running at ultra-low temperature.

[0031] The fluorine pump restarting method of the embodiment of the present application realizes the rapid recovery of the fluorine pump after the flow is cut off by starting the fluorine pump at a high frequency after a short period of cold blowing. The fluorine pump restarting method has the advantages of wide applicable temperature, short time consumption, no need for a compressor, and high success rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the structure of a dual-cycle refrigeration system provided in some embodiments of the present application;

[0033] Figure 2 A schematic flow chart of a fluorine pump restart method provided in some embodiments of the present application;

[0034] Figure 3 A flow chart of a fluorine pump restart method provided in one embodiment of the present application.

[0035] Figure 1 The components represented by the reference numbers are as follows:

[0036] 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

[0037] 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.

[0038] An embodiment of the present application provides a fluorine pump restart method for a dual-circulation refrigeration system.

[0039] like Figure 1 As shown, the dual-circulation 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 piping 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 therein; a fluorine pump bypass flow path 12 connected in parallel with the fluorine pump 4 and a second one-way valve 5 provided therein. The first one-way valve 9 is configured to allow one-way flow from the outlet of the evaporator 7 to the inlet of the condenser 1. The second one-way valve 5 is configured to allow one-way flow from the outlet of the liquid storage tank 3 to the inlet of the evaporator 7. The evaporator 7 and evaporating fan 8 are located indoors, while the condenser 1 and condensing fan 2 are located outdoors. The throttling device 6 may be, but is not limited to, an electronic expansion valve.

[0040] The dual-circulation refrigeration system can be set to have the following three refrigeration modes: compressor refrigeration mode, fluorine pump refrigeration mode, and mixed refrigeration mode. The working principles of each refrigeration mode are as follows:

[0041] Compressor cooling mode: First check valve 9 is closed, and second check valve 5 is open. Refrigerant flows sequentially through the first circulation loop formed by compressor 10, condenser 1, liquid storage tank 3, fluorine pump bypass path 12, throttling device 6, and evaporator 7. In this cooling mode, fluorine pump 4 is shut down, and compressor 10 is started to provide power for the system's cooling operation.

[0042] Fluorine pump refrigeration mode: the first one-way valve 9 is open and the second one-way valve 5 is closed. Figure 1In the direction indicated by the middle arrow, the refrigerant flows sequentially through the second circulation loop formed by fluorine pump 4, throttling device 6, evaporator 7, compressor bypass flow path 11, condenser 1, and liquid storage tank 3. In this cooling mode, fluorine pump 4 is activated and compressor 10 is deactivated, fully utilizing the outdoor natural cooling source. Fluorine pump 4 replaces compressor 10 to power the system circulation. Because the power of fluorine pump 4 is much lower than that of compressor 10, it can significantly reduce the power consumption of the computer room air conditioner, achieving significant energy savings.

[0043] Hybrid Refrigeration Mode: The first and second check valves 9 and 5 are closed. The refrigerant flows sequentially through the third circulation loop formed by the compressor 10, condenser 1, liquid storage tank 3, fluorine pump 4, throttling device 6, and evaporator 7. In this refrigeration mode, both the fluorine pump 4 and the compressor 10 are activated, partially utilizing the outdoor natural cooling source. The fluorine pump 4 can compensate for the circulating power of the refrigerant in the system, reduce the pressure loss of the refrigerant during the circulation process, enable the compressor 10 to operate under optimal conditions, reduce the energy consumption of the compressor 10, improve the refrigeration efficiency, and have a certain energy-saving effect.

[0044] The embodiment of the present application provides a fluorine pump restart method, which can be used in the above-mentioned dual-circulation refrigeration system. Figure 2 As shown, the fluorine pump restart method includes:

[0045] Step S202: After receiving the instruction to restart the fluorine pump due to flow interruption, the condensing fan is controlled to run at a first preset speed and the fluorine pump is turned off;

[0046] Step S204: Based on the time period during which the condensing fan runs at the first preset speed reaching the first preset time period, the condensing fan is controlled to run at the second preset speed, and the fluorine pump is controlled to start at the third preset speed.

[0047] The second preset speed is smaller than the first preset speed.

[0048] The fluorine pump restart method provided in the embodiment of the present application is mainly divided into two stages in the process of restarting after the fluorine pump 4 is cut off: a cooling stage and a startup stage. In the cooling stage, the condensing fan 2 runs at a first preset speed for a first preset time, and the fluorine pump 4 remains closed; in the startup stage, the speed of the condensing fan 2 is reduced to a second preset speed, and then the fluorine pump 4 is started at a third preset speed. The third preset speed can be set to the rated speed of the fluorine pump 4, or the speed when the operating frequency of the fluorine pump 4 is 40Hz-80Hz. Of course, the range of the third preset speed is not limited to the above, and can also be adjusted according to actual needs.

[0049] During the cooling stage, the condensing fan 2 runs at a relatively high speed so that the outdoor air flows quickly through the condenser 1, quickly cooling the refrigerant in the condenser 1 and shortening the cooling time. When the temperature of the refrigerant in the condenser 1 drops to close to the ambient temperature, on the one hand, the gas-liquid two-phase refrigerant in the liquid storage tank 3 after the last interruption is fully condensed to a liquid state, and on the other hand, the temperature and pressure of the liquid storage tank 3 change direction from low to high after the fluorine pump 4 is started. During the change process, the response of the pressure increase in the liquid storage tank 3 is faster than the temperature response, so that the refrigerant in the liquid storage tank 3 is in a supercooled state during the dynamic process, thereby avoiding the inlet of the fluorine pump 4 being in an unstable two-phase state caused by the refrigerant dynamic process being in an overheated state when the temperature and pressure change from high to low, so as to prevent the problem of interruption of flow at the inlet of the fluorine pump 4 due to refrigerant vaporization during the startup phase. During the startup phase, the speed of the condensing fan 2 is reduced, and the fluorine pump 4 is controlled to start at a larger third preset speed (such as the rated speed of the fluorine pump 4 or other larger speeds less than the rated speed of the fluorine pump 4), thereby enhancing the self-priming ability of the inlet of the fluorine pump 4 for the refrigerant, thereby improving the success rate of starting the fluorine pump 4, shortening the restart time, and eliminating the need for the compressor 10, thereby avoiding the reliability risk of the compressor 10 running at ultra-low temperatures.

[0050] The fluorine pump restarting method of the embodiment of the present application realizes the rapid recovery of the fluorine pump 4 after the flow is cut off by starting the fluorine pump 4 at high frequency after a short period of cold blowing. The fluorine pump restarting method has the advantages of wide applicable temperature, short time consumption, no need for the compressor 10, and high success rate.

[0051] In some exemplary embodiments, the first preset speed is 30%-100% of the rated speed of the condensing fan 2, such as: the first preset speed may be 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100% of the rated speed of the condensing fan 2; the second preset speed is not higher than 70% of the rated speed of the condensing fan 2, that is, the second preset speed may be 0-70% of the rated speed of the condensing fan 2, such as: the second preset speed may be 10%, 20%, 30%, 40%, 50%, 60%, 70%, the minimum speed, etc. of the rated speed of the condensing fan 2.

[0052] The first preset speed is set to 30%-100% of the rated speed of the condensing fan 2 (i.e., the maximum speed of the condensing fan 2), so that the speed of the condensing fan 2 is relatively high, which can effectively shorten the cooling time during the cooling stage and achieve rapid recovery of the fluorine pump 4 after the flow is interrupted. The second preset speed can be set to no more than 70% of the rated speed of the condensing fan 2, for example, the second preset speed can be the minimum speed of the condensing fan 2, and can also be set to other speeds as needed.

[0053] In some exemplary embodiments, the first preset time period is determined based on the temperature difference between indoor and outdoor temperatures.

[0054] The duration of the cooling phase (i.e., the duration during which the condensing fan 2 operates at the first preset speed) is a first preset duration, which can be determined based on the indoor and outdoor temperature difference ΔT, i.e., based on the return air temperature difference ΔT between the evaporating fan 8 and the condensing fan 2. In the fluorine pump cooling mode, the interruption of the fluorine pump 4 is related to the indoor and outdoor temperatures. Therefore, by determining the first preset duration of the cooling phase based on the indoor and outdoor temperature difference ΔT, the duration of the cooling phase can be shortened as much as possible while ensuring successful startup of the fluorine pump 4 during the startup phase, thereby achieving rapid recovery after the fluorine pump 4 interrupts its flow.

[0055] In some exemplary embodiments, the first preset time length is set to be positively correlated with the indoor and outdoor temperature difference ΔT, that is, the larger the indoor and outdoor temperature difference ΔT, the larger the value of the first preset time length is set; the smaller the indoor and outdoor temperature difference ΔT, the smaller the value of the first preset time length is set.

[0056] When the indoor temperature is higher than the outdoor temperature, the greater the indoor and outdoor temperature difference ΔT, the higher the indoor refrigerant temperature in the fluorine pump cooling mode, and the lower the minimum temperature the refrigerant can reach in the condenser 1. Therefore, a longer cooling time is required to cool the higher temperature refrigerant to a lower temperature. As a result, the temperature and pressure of the liquid storage tank 3 change from low to high after the fluorine pump 4 is started, and the refrigerant is in a supercooled state during the dynamic process, allowing the fluorine pump 4 to start successfully. Conversely, the smaller the indoor and outdoor temperature difference ΔT, the shorter the heat exchange time required for the refrigerant to drop from the lower indoor temperature to the higher outdoor temperature. Therefore, the cooling time can be shortened and the effective startup of the fluorine pump 4 can be ensured.

[0057] It should be understood that the first preset duration can be set not only to vary with the indoor and outdoor temperature difference, but also in other ways. For example, in some other exemplary embodiments, the first preset duration is set to a fixed duration that does not vary with the indoor and outdoor temperature difference. This fixed duration can be set based on experience to ensure a high startup success rate for the fluorine pump 4 while simultaneously taking into account the cooling effect on the refrigerant in the condenser 1. In addition, setting the first preset duration to a fixed duration helps simplify the control process for the restart process of the fluorine pump 4.

[0058] In some exemplary embodiments, the fluorine pump restarting method further includes: controlling the evaporation fan to operate at a fourth preset speed while controlling the condensation fan to operate at the first preset speed.

[0059] During the cooling phase, condensing fan 2 operates at a relatively high speed while evaporating fan 8 is controlled to operate at a fourth predetermined speed. When fluorine pump 4 is shut down, evaporating fan 8 operates to cause indoor air to flow through evaporator 7 and exchange heat with evaporator 7, thereby increasing the subcooling of the refrigerant at the inlet of fluorine pump 4 and thereby improving the success rate of fluorine pump 4 startup.

[0060] In some exemplary embodiments, the fluorine pump restart method further includes: controlling the evaporation fan to operate at a fourth preset speed or a fifth preset speed based on the condensing fan operating at the first preset speed for a first preset time period. The fifth preset speed may be less than the fourth preset speed.

[0061] After the cooling phase, during the startup phase, in which the fluorine pump 4 is started at the third preset speed, the speed of the condensing fan 2 is reduced and operated at the lower speed, while the speed of the evaporating fan 8 is controlled to remain unchanged, that is, still operate at the fourth preset speed, or the speed of the evaporating fan 8 is controlled to be reduced and operate at the fifth preset speed. The rotation of the evaporating fan 8 during the startup phase also helps to improve the success rate of the fluorine pump 4 startup.

[0062] In some exemplary embodiments, the fourth preset speed may be the rated speed of the evaporation fan 8 , and the fifth preset speed may be the minimum speed of the evaporation fan 8 .

[0063] Setting the fourth preset speed to the rated speed of the evaporation fan 8 (ie, the maximum speed of the evaporation fan 8 ) is beneficial to shortening the cooling time in the cooling stage and achieving rapid recovery of the fluorine pump 4 after flow interruption.

[0064] The fourth preset speed and the fifth preset speed can be set as the maximum speed and the minimum speed of the evaporating fan 8, and can also be set to other speeds as needed.

[0065] In some exemplary embodiments, the fluorine pump restart method further includes: controlling the opening of the throttling device to a first preset opening based on the duration of the condensing fan operating at the first preset speed reaching the first preset duration. The first preset opening can be set to 75%-100% of the maximum opening of the throttling device, for example, 75%, 80%, 85%, 90%, 95%, 100%, etc. of the maximum opening of the throttling device. Of course, the first preset opening is not limited to the above value range and can be adjusted according to actual needs.

[0066] In some exemplary embodiments, the fluorine pump restart method further includes: while controlling the condenser fan to operate at a first preset speed and shutting down the fluorine pump, closing the throttling device or controlling the opening of the throttling device to a second preset opening. The second preset opening can be 12%-80% of the maximum opening of the throttling device, such as 15%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, etc. of the maximum opening of the throttling device. Alternatively, the second preset opening can be set to other opening values ​​as needed, such as the maximum opening of the throttling device.

[0067] During the cooling stage, the throttling device 6 can be closed, or the throttling device 6 can be opened to the second preset opening; during the startup stage, the opening of the throttling device 6 can be adjusted to the first preset opening to increase the refrigerant flow in the second circulation loop under the fluorine pump refrigeration mode, which is beneficial to increase the amount of liquid refrigerant in the liquid storage tank 3 to achieve effective startup of the fluorine pump 4.

[0068] During the restart process of the fluorine pump 4, by controlling the speed of the condensing fan 2, the speed of the fluorine pump 4, and the opening of the throttling device 6 in the cooling stage and the startup stage, rapid and efficient recovery after the second circulation loop is interrupted in the fluorine pump refrigeration mode is achieved.

[0069] In one embodiment, Figure 3 As shown, the fluorine pump restart method includes the following steps:

[0070] According to the instruction to restart the fluorine pump due to flow interruption, the central controller (control device) sends a control instruction to the evaporating fan, the condensing fan, the fluorine pump and the throttling device, controlling the condensing fan to operate at a first preset speed (e.g., rated speed) fc_s, the evaporating fan to operate at a fourth preset speed (e.g., rated speed) fv_s, the fluorine pump to be turned off, and the throttling device (e.g., electronic expansion valve) to be closed;

[0071] Determine whether the duration of the above state reaches (is greater than or equal to) the first preset time length t_pre. If it reaches the first preset time length t_pre, the speed of the condensing fan is set to the second preset speed (such as: minimum speed) fc_min, the speed of the evaporating fan is maintained unchanged at fv_s, the fluorine pump is started at the third preset speed (such as: rated speed) fp_s, and the throttling device (such as an electronic expansion valve) is opened to the first preset opening (such as: maximum opening) eev_max.

[0072] The first preset time duration t_pre is determined by a temperature difference ΔT=Th−Tc between a return air temperature Th of the evaporating fan and a return air temperature Tc of the condensing fan.

[0073] 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 fluorine pump restart method as described in any of the above embodiments are implemented, thereby having all the above-mentioned beneficial effects, which will not be repeated here.

[0074] 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 device, a discrete gate or transistor logic device, or a discrete hardware component. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or any conventional processor.

[0075] The embodiment of the present application also provides a dual-circulation refrigeration system, including a control device as in the above embodiment, thus having all the above-mentioned beneficial effects, which will not be repeated here.

[0076] 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 restart method as described in any one of the above embodiments is implemented, thereby having all the above-mentioned beneficial effects, which will not be repeated here.

[0077] 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 device or element referred to must have a specific orientation, be constructed in a specific orientation and steps, and therefore should not be understood as a limitation to the present application.

[0078] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0079] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0080] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it 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. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0082] 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.

[0083] 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 as one or more instructions or codes on or transmitted via a computer-readable medium and executed by a hardware-based processing unit. The 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 the transfer of a computer program from one place to another, such as according to a communication protocol. In this manner, a computer-readable medium may generally correspond to a non-transitory tangible computer-readable storage medium or a communication medium such as a signal or carrier wave. The 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 techniques described in this disclosure. A computer program product may include a computer-readable medium.

[0084] 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 desired program code in the form of instructions or data structures and that can be accessed by a computer. Furthermore, 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 a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwaves, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwaves 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 rather refer to non-transient tangible storage media. As used herein, disk and optical disk include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, or Blu-ray disc, among others, where disks typically reproduce data magnetically, while optical discs use lasers to reproduce data optically. Combinations of the above should also be included within the scope of computer-readable media.

[0085] 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 aforementioned structures or any other structure 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 into a combined codec. Furthermore, the techniques may be fully implemented in one or more circuits or logic elements.

[0086] 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 interoperable hardware units (including one or more processors as described above) in combination with appropriate software and / or firmware.

Claims

1. A fluorine pump restart method for a dual-circulation refrigeration system, characterized in that: The fluorine pump restart method comprises: After receiving the instruction to restart the fluorine pump due to flow interruption, the condensing fan is controlled to run at a first preset speed and the fluorine pump is turned off; Based on the time period during which the condensing fan runs at the first preset speed reaching the first preset time period, controlling the condensing fan to run at a second preset speed, and controlling the fluorine pump to start at a third preset speed; Wherein, the second preset speed is smaller than the first preset speed.

2. The fluorine pump restart method according to claim 1, characterized in that: Also includes: While the condensing fan is controlled to operate at the first preset speed, the evaporating fan is controlled to operate at a fourth preset speed.

3. The fluorine pump restart method according to claim 2, characterized in that: Also includes: Based on the time period during which the condensing fan operates at the first preset speed reaching the first preset time period, controlling the evaporating fan to operate at the fourth preset speed or the fifth preset speed; Wherein, the fifth preset speed is less than the fourth preset speed.

4. The fluorine pump restart method according to claim 1, characterized in that: Also includes: Based on the time period during which the condensing fan runs at the first preset speed reaching the first preset time period, the opening of the throttling device is controlled to be the first preset opening.

5. The fluorine pump restart method according to claim 4, characterized in that: Also includes: While controlling the condensing fan to run at a first preset speed and shutting down the fluorine pump, the throttling device is closed, or the opening of the throttling device is controlled to be a second preset opening.

6. The fluorine pump restart method according to claim 1, characterized in that: The first preset speed is 30%-100% of the rated speed of the condensing fan; The second preset speed is not higher than 70% of the rated speed of the condensing fan; and / or The third preset speed is the rated speed of the fluorine pump, or the speed when the operating frequency of the fluorine pump is 40 Hz-80 Hz.

7. The fluorine pump restart method according to claim 3, characterized in that: The fourth preset speed is the rated speed of the evaporating fan; and / or The fifth preset speed is the minimum speed of the evaporation fan.

8. The fluorine pump restart method according to claim 5, characterized in that: The first preset opening is 75%-100% of the maximum opening of the throttling device; and / or The second preset opening is 12%-80% of the maximum opening of the throttling device.

9. The method for restarting a fluorine pump according to any one of claims 1 to 8, characterized in that: The first preset duration is set to be determined based on the indoor and outdoor temperature difference, or is a fixed duration.

10. The method for restarting a fluorine pump according to any one of claims 1 to 8, characterized in that: The first preset time duration is set to be positively correlated with the indoor and outdoor temperature difference.

11. 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 fluorine pump restarting method according to any one of claims 1 to 10 are implemented.

12. A dual-circulation refrigeration system, characterized in that: Comprising the control device as claimed in claim 11.

13. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the fluorine pump restarting method according to any one of claims 1 to 10 is implemented.

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