Fluorine pump restarting method, control device, double-circulation refrigerating system and storage medium

Abstract

The embodiment of the invention provides a fluorine pump restarting method, a control device, a double-circulation refrigerating system and a storage medium. The fluorine pump restarting method can be used for a double-circulation refrigerating system and is characterized by comprising the steps that after an instruction that a fluorine pump needs to be restarted during flow cutoff is received, a condensate fan is controlled to operate at a first preset rotating speed, and the fluorine pump is closed; controlling the condensate fan to run at a second preset rotating speed and controlling the fluorine pump to start at a third preset rotating speed on the basis that the running duration of the condensate fan at the first preset rotating speed reaches a first preset duration; wherein the second preset rotating speed is smaller than the first preset rotating speed. According to the fluorine pump restarting method, the fluorine pump is started at high frequency after short-time cold blowing, rapid recovery of the fluorine pump after cutoff is achieved, and the fluorine pump restarting method has the advantages of being wide in application temperature, short in consumed time, free of the help of a compressor and high in success rate.

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 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 life, the existing fluorine pump natural cooling units of computer room air conditioners often use centrifugal pumps as refrigerant transportation devices. However, when the refrigerant at the inlet of the centrifugal pump 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 existence 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 flow interruption of the fluorine pump.

[0003] The existing technology generally adopts multiple attempts to restart the fluorine pump, or the compressor assisted start 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 restarting method, a control device, a dual-circulation refrigeration system and a computer-readable storage medium, which realizes the rapid recovery of the fluorine pump after flow interruption by starting the fluorine pump 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 a compressor, and high success rate.

[0005] A fluorine pump restart method provided in an embodiment of the present application is used in a dual-cycle refrigeration system, characterized in that the fluorine pump restart method comprises:

[0006] After receiving the instruction that the fluorine pump needs to be restarted 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 duration that the condensing fan runs at the first preset speed reaching the first preset time duration, 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 rotation speed is smaller than the first preset rotation speed.

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

[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 comprises:

[0012] Based on the time duration that the condensing fan runs at the first preset speed reaching the first preset time duration, controlling the evaporating fan to run at the fourth preset speed or the fifth preset speed;

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

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

[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 comprises:

[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 rotation speed is the rated rotation speed of the fluorine pump, or the rotation 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 evaporator fan; and / or

[0022] The fifth preset rotation speed is the minimum rotation speed of the evaporating 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 set to be 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] The 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 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] The embodiment of the present application further provides a computer-readable storage medium storing a computer program, wherein the computer program implements the above-mentioned fluorine pump restarting 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: the cooling stage and the startup stage. In the cooling stage, the condensing fan runs at a relatively high speed so that the outdoor air can quickly flow through the condenser, quickly cool down the refrigerant in the condenser, and shorten the cooling time. When the temperature of the refrigerant 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 temperature and pressure of the liquid storage tank change direction from low to high after the fluorine pump is started. 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 flow interruption at the fluorine pump inlet due to refrigerant gasification during the startup stage. During the startup phase, the speed of the condensing fan is reduced to reduce the degree of vaporization caused by the change in the condenser speed during the startup process, and the fluorine pump is controlled to start at a higher speed (the third preset speed) to enhance the self-priming ability of the fluorine pump inlet for the refrigerant. This can improve the success rate of the fluorine pump startup, shorten the restart time, and eliminate the need for a compressor, thus avoiding the reliability risk of the compressor operating at ultra-low temperatures.

[0031] The fluorine pump restarting method of the embodiment of the present application realizes the rapid recovery of the fluorine pump after flow interruption by starting the fluorine pump 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 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 schematic flow chart of a fluorine pump restart method provided in one embodiment of the present application.

[0035] Figure 1 The parts represented by the various reference numerals are listed 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] The 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-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 liquid storage tank 3 to the inlet of the evaporator 7. 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.

[0040] The dual-cycle 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 refrigeration mode: the first check valve 9 is closed and the second check valve 5 is open. The refrigerant flows sequentially through the first circulation loop formed by 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 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.

[0042] Fluorine pump refrigeration mode: the first one-way valve 9 is turned on, and the second one-way valve 5 is turned off. Figure 1In the direction indicated by the middle arrow, the refrigerant flows sequentially through the second circulation loop formed by the fluorine pump 4, the throttling device 6, the evaporator 7, the compressor bypass flow path 11, the condenser 1 and the liquid storage tank 3. 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.

[0043] Mixed refrigeration mode: the first check valve 9 is closed, and the second check valve 5 is closed. The refrigerant flows through the third circulation loop formed by 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. 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.

[0044] The present application embodiment 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 rotation speed is smaller than the first preset rotation speed.

[0048] The fluorine pump restarting 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 operates 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 can quickly flow through the condenser 1, quickly cool down the refrigerant in the condenser 1, and shorten the cooling time. When the refrigerant temperature in the condenser 1 is reduced 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 in 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 at the inlet of the fluorine pump 4 due to the gasification of the refrigerant during the startup stage. 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 aid of the compressor 10, thereby avoiding the reliability risk of the compressor 10 operating 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 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 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 large, which can effectively shorten the blowing time in the blowing stage, and realize the rapid recovery of the fluorine pump 4 after the flow is cut off. The second preset speed can be set to no more than 70% of the rated speed of the condensing fan 2, such as: 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 set to be determined based on the indoor and outdoor temperature difference.

[0054] The duration of the cooling phase (i.e., the duration of the condensing fan 2 running at the first preset speed) is the first preset duration, which can be determined according to the indoor and outdoor temperature difference ΔT, that is, according to the return air temperature difference ΔT between the evaporating fan 8 and the condensing fan 2. In the fluorine pump refrigeration mode, the interruption of the fluorine pump 4 is related to the indoor and outdoor temperature. Therefore, the first preset duration of the cooling phase is determined according to the indoor and outdoor temperature difference ΔT. The duration of the cooling phase can be shortened as much as possible while ensuring the successful startup of the fluorine pump 4 in the startup phase, so as to achieve rapid recovery of the fluorine pump 4 after interruption.

[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 is, the larger the value of the first preset time length is set to; the smaller the indoor and outdoor temperature difference ΔT is, the smaller the value of the first preset time length is set to.

[0056] When the indoor temperature is higher than the outdoor temperature, the greater the indoor and outdoor temperature difference △T, the higher the indoor refrigerant temperature in the fluorine pump cooling mode, and the lower the lowest temperature that the refrigerant can reach in the condenser 1. Therefore, a longer blowing time is required to cool the higher temperature refrigerant to a lower temperature, so that 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, so that the fluorine pump 4 can be successfully started. On the contrary, the smaller the indoor and outdoor temperature difference △T, the smaller the heat exchange time required for the refrigerant to drop from a lower indoor temperature to a higher outdoor temperature, so the blowing time can be shortened, and the effective start of the fluorine pump 4 can also be guaranteed.

[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 and does not vary with the indoor and outdoor temperature difference. The fixed duration can be set based on experience to give the fluorine pump 4 a higher startup success rate while taking into account the cooling effect of the refrigerant in the condenser 1. In addition, the first preset duration is set to a fixed duration, which is conducive to simplifying the control procedure of the restart process of the fluorine pump 4.

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

[0059] In the cooling stage, the condensing fan 2 runs at a relatively high speed while the evaporating fan 8 is controlled to run at a fourth preset speed. When the fluorine pump 4 is cut off and turned off, the evaporating fan 8 works to make the indoor air flow through the evaporator 7 and exchange heat with the evaporator 7, which is also beneficial to improve the supercooling degree of the refrigerant at the inlet of the fluorine pump 4, thereby improving the success rate of starting the fluorine pump 4.

[0060] In some exemplary embodiments, the fluorine pump restart method further includes: based on the duration of the condensing fan running at the first preset speed reaching the first preset time, controlling the evaporating fan to run at a fourth preset speed or a fifth preset speed, wherein the fifth preset speed may be less than the fourth preset speed.

[0061] After the cooling stage, the fluorine pump 4 starts at the third preset speed. The speed of the condensing fan 2 is reduced, and while running at a lower speed, the speed of the evaporating fan 8 is controlled to remain unchanged, that is, it still runs at the fourth preset speed, or the speed of the evaporating fan 8 is controlled to be reduced and run at the fifth preset speed. During the startup stage, the rotation of the evaporating fan 8 is also conducive to improving the success rate of the fluorine pump 4 starting.

[0062] In some exemplary embodiments, the fourth preset rotation speed may be the rated rotation speed of the evaporation fan 8 , and the fifth preset rotation speed may be the minimum rotation 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 rotational speed and the fifth preset rotational speed may be set to the maximum rotational speed and the minimum rotational speed of the evaporating fan 8, and may also be set to other rotational speeds as required.

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

[0066] In some exemplary embodiments, the fluorine pump restart method further includes: while controlling the condensing fan to run at a first preset speed and shutting down the fluorine pump, shutting down the throttling device, or controlling the opening of the throttling device to be a second preset opening. The second preset opening may be 12%-80% of the maximum opening of the throttling device, such as: the second preset opening may be 15%, 20%, 30%, 40%, 50%, 60%, 70%, 80% of the maximum opening of the throttling device, etc. Alternatively, the second preset opening may be set to other opening values ​​as required, such as: the second preset opening may be set to 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 can be 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, controls the condensing fan to operate at a first preset speed (such as: rated speed) fc_s, the evaporating fan to operate at a fourth preset speed (such as: rated speed) fv_s, the fluorine pump is turned off, and the throttling device (such as an electronic expansion valve) is turned off;

[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 at fv_s unchanged, 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 t_pre is determined by the temperature difference ΔT=Th-Tc between the return air temperature Th of the evaporating fan and the return air temperature Tc of the condensing fan.

[0073] The 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 restarting method 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 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.

[0075] 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.

[0076] The embodiment of the present application also provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the fluorine pump restarting 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 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[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 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.

[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 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.

[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 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.

[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 inter-step hardware units (including one or more processors as described above) in combination with suitable software and / or firmware.

Claims

1. A fluorine pump restart method for a dual-cycle refrigeration system, characterized in that: The fluorine pump restart method comprises: After receiving the instruction that the fluorine pump needs to be restarted 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 duration that the condensing fan runs at the first preset speed reaching the first preset time duration, 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 rotation speed is less than the first preset rotation 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 duration that the condensing fan runs at the first preset speed reaching the first preset time duration, controlling the evaporating fan to run at the fourth preset speed or the fifth preset speed; Wherein, the fifth preset rotation speed is less than the fourth preset rotation 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 rotation speed is the rated rotation speed of the fluorine pump, or the rotation 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 rotation speed is the minimum rotation speed of the evaporating 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 duration is set to be positively correlated with the indoor and outdoor temperature difference.

11. A control device, characterized in that: The invention 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 as claimed in any one of claims 1 to 10 are implemented.

12. A dual-cycle refrigeration system, characterized in that: Comprising a 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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