Control methods, control devices, dual-circulation refrigeration systems, and storage media.

Abstract

The invention relates to a control method, a control device, a double-circulation refrigeration system, and a storage medium. The control method is used to control a double-circulation refrigeration system. A bypass pipe (6) is connected between the outlet of the fluorine pump (4) of the double-circulation refrigeration system and the liquid reservoir (3) of the double-circulation refrigeration system, and a throttling device (11) is arranged on the pipe connected between the outlet of the fluorine pump (4) and the evaporator (10) of the double-circulation refrigeration system.The control method includes the following steps: based on the received fluorine pump start command (4), adjust the fluorine pump (4) to the first preset rotation speed or first preset frequency, and adjust the throttle device (11) to the first preset opening; based on the pressure difference between the outlet and inlet of the fluorine pump (4) being greater than the preset pressure difference, complete the start of the fluorine pump (4); and create the first preset opening configuration determined based on the first preset rotation speed or first preset frequency and based on the difference between the indoor and outdoor temperatures.

Description

Control method, control device, dual-cycle refrigeration system and storage medium

[0001] This application claims priority to the Chinese patent application filed on September 15, 2023, with application number 202311189492.9 and invention name “Control method, control device, dual-cycle refrigeration system and storage medium”, the content of which should be understood as incorporated into this application by reference. Technical Field

[0002] The present disclosure relates to, but is not limited to, the technical field of refrigeration systems, and specifically refers to, but is not limited to, a control method, a control device, a dual-cycle refrigeration system, and a computer-readable storage medium. Background Art

[0003] 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 inlet of the centrifugal pump (fluorine pump) is vaporized, it is very easy for the centrifugal pump (fluorine pump) to lose its head and cause interruption due to the failure of liquid sealing. 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 interruption of the fluorine pump.

[0004] Summary of the Invention

[0005] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0006] An embodiment of the present disclosure provides a control method for a dual-circulation refrigeration system, wherein a bypass pipeline is connected between the outlet of a fluorine pump of the dual-circulation refrigeration system and a liquid storage tank, and a throttling device is provided in a pipeline connected between the outlet of the fluorine pump and an evaporator of the dual-circulation refrigeration system; the control method comprises:

[0007] Based on the received fluorine pump start instruction, adjusting the fluorine pump to a first preset speed or a first preset frequency, and adjusting the throttling device to a first preset opening;

[0008] Based on the pressure difference between the outlet and the inlet of the fluorine pump being greater than the preset pressure difference, the fluorine pump is started;

[0009] The first preset opening degree is determined according to the first preset rotation speed or the first preset frequency and the indoor and outdoor temperature difference.

[0010] An embodiment of the present disclosure 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 control method when executing the computer program.

[0011] The present disclosure also provides a dual-cycle refrigeration system, comprising:

[0012] A double-circulation refrigeration circuit includes a fluorine pump and a liquid storage tank, wherein a bypass pipeline is connected between the outlet of the fluorine pump and the liquid storage tank; and

[0013] The above-mentioned control device is configured to control the operation of the dual-cycle refrigeration circuit.

[0014] The embodiment of the present disclosure further provides a computer-readable storage medium storing a computer program, which implements the above-mentioned control method when executed by a processor.

[0015] Still other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description.

[0016] Summary of the Figures

[0017] FIG1 is a schematic structural diagram of a dual-cycle refrigeration system provided in some embodiments of the present disclosure;

[0018] FIG2 is a flow chart of a control method provided in some embodiments of the present disclosure;

[0019] FIG3 is a flow chart of a control method provided in some embodiments of the present disclosure;

[0020] FIG4 is a schematic diagram of a fluorine pump assembly of a dual-cycle refrigeration system provided by some embodiments of the present disclosure;

[0021] FIG5 is a schematic diagram of a fluorine pump assembly of a dual-cycle refrigeration system provided by other embodiments of the present disclosure;

[0022] FIG6 is a schematic diagram of a fluorine pump assembly of a dual-cycle refrigeration system provided by yet other embodiments of the present disclosure;

[0023] FIG7 is a schematic diagram of a fluorine pump assembly of a dual-cycle refrigeration system provided in some further embodiments of the present disclosure;

[0024] FIG8 is a schematic diagram of a fluorine pump assembly of a dual-circulation refrigeration system provided in some embodiments of the present disclosure.

[0025] In the accompanying drawings, the components represented by each reference numeral are listed as follows: 1-condenser, 2-inlet pipe, 3-liquid storage tank, 31-liquid inlet, 32-liquid outlet, 33-liquid return port, 4-fluorine pump, 5-outlet pipe, 6-bypass pipeline, 7-safety valve, 8-bypass valve, 9-compressor, 10-evaporator, 11-throttling device, 12-compressor bypass flow path, 13-first one-way valve, 14-fluorine pump bypass flow path, 15-second one-way valve, 16-condensing fan, 17-evaporating fan.

[0026] Details

[0027] The principles and features of the present disclosure are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present disclosure and are not used to limit the scope of the present disclosure.

[0028] In some cases, the success rate of starting the fluorine pump is improved by starting it at a higher frequency. However, on the one hand, if the starting frequency is too high, the refrigerant flow rate will be too large when the system is running, and the outlet superheat of the evaporator will be insufficient, causing the compressor to carry liquid. This will cause reliability problems for the compressor when the compressor cooling mode and the fluorine pump cooling mode are frequently switched. On the other hand, if the starting frequency is too low, the success rate of starting the fluorine pump will be low, especially in ultra-low temperature conditions. In addition, even if the fluorine pump is started by using a large (fluorine pump) frequency and a small (electronic expansion valve) opening, since the fluorine pump circulation flow rate is still small, its effect is equivalent to the success rate of starting with a small (fluorine pump) frequency and a large (electronic expansion valve) opening. And because the fluorine pump has a wide application temperature range, the contradiction between high frequency and easy liquid accumulation and low frequency and difficulty in starting is difficult to reconcile.

[0029] Based on this, an embodiment of the present disclosure provides a control method for a dual-cycle refrigeration system.

[0030] As shown in Figure 1, the binary refrigeration system includes a binary refrigeration circuit, which may include: a compressor 9, a condenser 1, a liquid storage tank 3, a fluorine pump 4, an evaporator 10, and a throttling device 11. The compressor 9, condenser 1, liquid storage tank 3, fluorine pump 4, throttling device 11, and evaporator 10 are sequentially connected by pipelines to form a circuit. A bypass line 6 is connected between the outlet of the fluorine pump 4 and the liquid storage tank 3.

[0031] The dual-circulation refrigeration system may further include: a compressor bypass flow path 12 connected in parallel with the compressor 9 and a first one-way valve 13 arranged on the compressor bypass flow path 12; and a fluorine pump bypass flow path 14 connected in parallel with the fluorine pump 4 and a second one-way valve 15 arranged on the fluorine pump bypass flow path 14.

[0032] The dual-cycle refrigeration system may further include: a condensing fan 16 and an evaporating fan 17 . The condensing fan 16 is used to drive outdoor air to flow through the condenser 1 , and the evaporating fan 17 is used to drive indoor air to flow through the evaporator 10 .

[0033] Among them, the compressor 9 and the fluorine pump 4 can drive the refrigerant to circulate in a closed loop. The evaporator 10 and the evaporating fan 17 are arranged on the indoor side, and the evaporator 10 is used to absorb the heat in the room; the condenser 1 and the condensing fan 16 are arranged on the outdoor side, and the condenser 1 is used to dissipate the heat absorbed by the evaporator 10 to the outdoor environment. The throttling device 11 can be, but is not limited to, an electronic expansion valve, and the flow rate of the refrigerant flowing to the evaporator 10 can be adjusted by controlling the opening of the electronic expansion valve. The first one-way valve 13 is configured to conduct one-way flow in the direction from the outlet of the evaporator 10 to the inlet of the condenser 1. The second one-way valve 15 is configured to conduct one-way flow in the direction from the outlet of the liquid storage tank 3 to the inlet of the evaporator 10.

[0034] 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:

[0035] Compressor cooling mode: First check valve 13 is closed, and second check valve 15 is open. Compressor 9, condenser 1, liquid storage tank 3, fluorine pump bypass path 14, throttling device 11, and evaporator 10 are connected to form a compressor cooling circuit, through which refrigerant flows. In this compressor cooling mode, fluorine pump 4 is shut down, and compressor 9 is started, providing power for the system's cooling operation.

[0036] Fluorine pump refrigeration mode: the first one-way valve 13 is turned on and the second one-way valve 15 is closed. As shown in Figure 1, the fluorine pump 4, the throttling device 11, the evaporator 10, the compressor bypass flow path 12, the condenser 1 and the liquid storage tank 3 can be connected to form a fluorine pump refrigeration circuit, and the refrigerant can flow through the fluorine pump refrigeration circuit in sequence. The fluorine pump refrigeration circuit can cooperate with the condensing fan 16 and the evaporating fan 17 to form a fluorine pump system. In this fluorine pump refrigeration mode, the fluorine pump 4 is started and the compressor 9 is stopped to make full use of the natural cold source outdoors, and the fluorine pump 4 is used instead of the compressor 9 to provide power for the system cycle. Since the power of the fluorine pump 4 can be much smaller than the power of the compressor 9, the power consumption of the dual-circulation refrigeration system can be significantly reduced, which can have a significant energy-saving effect.

[0037] Hybrid refrigeration mode: the first one-way valve 13 is closed, and the second one-way valve 15 is closed. The compressor 9, the condenser 1, the liquid storage tank 3, the fluorine pump 4, the throttling device 11, and the evaporator 10 can be connected to form a hybrid refrigeration circuit, and the refrigerant can flow through the hybrid refrigeration circuit in sequence. In this hybrid refrigeration mode, the fluorine pump 4 and the compressor 9 are both started, and the outdoor natural cold source is partially utilized. 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, and enable the compressor 9 to operate under the optimal working conditions, thereby reducing the energy consumption of the compressor 9, improving the refrigeration efficiency, and having a certain energy-saving effect.

[0038] As shown in Figure 2, an embodiment of the present disclosure provides a control method that can be used for the above-mentioned dual-circulation refrigeration system, in which a bypass pipe 6 is connected between the outlet of the fluorine pump 4 and the liquid storage tank 3 of the dual-circulation refrigeration system, and a throttling device 11 is provided on the pipe connecting the outlet of the fluorine pump 4 and the evaporator 10 (as shown in Figure 1).

[0039] The control method includes:

[0040] Step S202: Based on the received fluorine pump start instruction, the fluorine pump is adjusted to a first preset speed or a first preset frequency, and the throttling device is adjusted to a first preset opening;

[0041] Step S204: Based on the pressure difference between the outlet and the inlet of the fluorine pump being greater than the preset pressure difference, the fluorine pump is started.

[0042] The first preset opening degree is determined according to a first preset rotation speed or a first preset frequency, and according to the indoor and outdoor temperature difference.

[0043] The control method provided by the embodiment of the present disclosure can be used to control the dual-circulation refrigeration system with a bypass line 6 shown in Figure 1. The setting of the bypass line 6 allows a portion of the refrigerant discharged from the outlet of the fluorine pump 4 to flow back to the liquid storage tank 3 through the bypass line 6, so that the high pressure at the outlet of the fluorine pump 4 can be used to slow down or suppress the refrigerant vaporization caused by the sudden drop in pressure in the liquid storage tank 3, thereby greatly improving the ability of the fluorine pump refrigeration circuit to resist flow interruption, solving the problem of the fluorine pump 4 (centrifugal pump) in the fluorine pump refrigeration circuit being prone to flow interruption and failure in some cases, and greatly improving the operational reliability of the fluorine pump refrigeration circuit.

[0044] During the control process of the dual-circulation refrigeration system, after receiving the start-up instruction of the fluorine pump 4, the fluorine pump 4 can be adjusted to the first preset speed or the first preset frequency, and the throttling device 11 can be adjusted to the first preset opening, wherein the first preset opening of the throttling device 11 can be determined according to the first preset speed or the first preset frequency of the fluorine pump 4, and according to the indoor and outdoor temperature difference (that is, the temperature difference between the return air temperature of the evaporating fan 17 (or evaporator 10) and the return air temperature of the condensing fan 16 (or condenser 1)), which is conducive to achieving the first preset speed or the first preset frequency of the fluorine pump 4, the opening of the throttling device 11 and the indoor and outdoor temperature difference, and is conducive to improving the success rate of starting the fluorine pump 4 (or the fluorine pump system) (when the pressure difference between the outlet and the inlet of the fluorine pump 4 is greater than the preset pressure difference, it indicates that the fluorine pump 4 (or the fluorine pump system) has completed the startup), and can avoid the problem of liquid accumulation in the compressor 9 while achieving easy startup of the fluorine pump 4. The step of adjusting the fluorine pump 4 to the first preset speed or the first preset frequency (i.e., the adjustment step of the fluorine pump 4), and the step of adjusting the throttling device 11 to the first preset opening (i.e., the adjustment step of the throttling device 11), can be performed simultaneously (or almost simultaneously), or can be performed one after the other, such as: the adjustment step of the fluorine pump 4 can be performed after the adjustment step of the throttling device 11, or before the adjustment step of the throttling device 11.

[0045] The control method of the disclosed embodiment determines the opening of the throttling device 11 according to the first preset speed or first preset frequency of the fluorine pump 4 and the indoor and outdoor temperature difference when starting the fluorine pump 4, and combines the design of the bypass pipe 6 from the outlet of the fluorine pump 4 to the liquid storage tank 3 to achieve easy starting of the fluorine pump 4 while avoiding the problem of liquid accumulation in the compressor 9.

[0046] In some exemplary embodiments, the first preset opening is configured to be negatively correlated with the first preset speed or the first preset frequency, i.e., the higher the first preset speed or the first preset frequency when the fluorine pump 4 is started, the smaller the first preset opening of the throttling device 11. Specifically, when the fluorine pump 4 is started, its first preset speed or the first preset frequency can be set to a preset higher speed (e.g., rated speed) or a preset higher frequency (e.g., rated frequency), so that the first preset opening of the throttling device 11 is smaller at this time; and as the first preset speed or the first preset frequency of the fluorine pump 4 gradually decreases, the first preset opening of the throttling device 11 can gradually increase.

[0047] By setting the first preset opening of the throttling device 11 to be negatively correlated with the first preset speed or the first preset frequency of the fluorine pump 4, the high-frequency and high-flow startup of the fluorine pump 4 can be achieved, thereby improving the startup success rate. Moreover, by closing the opening of the throttling device 11, the excess refrigerant flow can be circulated through the bypass pipe 6, thereby preventing the excessive refrigerant flow in the fluorine pump system from causing liquid accumulation in the compressor 9, thereby solving the problem of the fluorine pump 4 being difficult to start and the compressor 9 being easily filled with liquid.

[0048] In some exemplary embodiments, the first preset opening is set to be positively correlated with the indoor and outdoor temperature difference, that is, the greater the indoor and outdoor temperature difference, the greater the first preset opening of the throttling device 11.

[0049] By setting the first preset opening of the throttling device 11 to be negatively correlated with the first preset speed or the first preset frequency when the fluorine pump 4 is started, and positively correlated with the indoor and outdoor temperature difference, when the fluorine pump 4 is started, it can be started with a large frequency or speed of the fluorine pump 4 and a small opening of the throttling device 11. In combination with the bypass pipe 6 from the outlet of the fluorine pump 4 to the liquid storage tank 3, the fluorine pump 4 can be easily started while avoiding the problem of liquid accumulation in the compressor 9.

[0050] In some exemplary embodiments, the value range of the first preset opening can be set to 12%-80% of the maximum opening of the throttling device 11, such as: the first preset opening can be 20%, 30%, 40%, 50%, 60%, 70%, 80% and the like of the maximum opening of the throttling device 11.

[0051] Of course, the value range of the first preset opening is not limited to the above, and can also be adjusted according to actual needs.

[0052] In some exemplary embodiments, the first preset frequency of the fluorine pump 4 can be set to a value range of 40 Hz-80 Hz. For example, the first preset frequency can be set to a value range of 40 Hz, 45 Hz, 50 Hz, 55 Hz, 60 Hz, 65 Hz, 70 Hz, 75 Hz, 80 Hz, etc.

[0053] Of course, the value range of the first preset frequency is not limited to the above, and can be adjusted according to actual needs.

[0054] In some exemplary embodiments, the control method further includes:

[0055] After the fluorine pump is started, the speed or frequency of the fluorine pump is PID controlled with the suction superheat at the outlet of the evaporator as the target.

[0056] PID (Proportional Integral Derivative) control refers to the control based on the proportion, integration, and differentiation of the error generated by comparing the information collected from the real-time data of the controlled object with the given value. PID control has the advantages of simple principle, strong robustness, and wide applicability.

[0057] In some exemplary embodiments, the control method further includes:

[0058] After the fluorine pump is started, gradually adjust the throttling device to the maximum opening.

[0059] In the fluorine pump refrigeration mode, adjusting the opening of the throttling device 11 can adjust the amount of refrigerant flowing out of the liquid storage tank 3, thereby adjusting the amount of refrigerant in the fluorine pump refrigeration circuit and the liquid level in the liquid storage tank 3. After the fluorine pump 4 (or the fluorine pump system) is successfully started, gradually adjusting the throttling device 11 to the maximum opening is beneficial to increasing the amount of refrigerant in the fluorine pump refrigeration circuit in the fluorine pump refrigeration mode, which is beneficial to improving the heat exchange effect of the refrigerant and thus reducing the energy consumption of the system.

[0060] In some exemplary embodiments, gradually adjusting the throttling device to a maximum opening includes:

[0061] The opening of the control throttling device increases linearly with time until it reaches the maximum opening; or

[0062] Controlling the opening of the throttling device to increase non-linearly over time until the maximum opening; or

[0063] Taking the suction superheat at the outlet of the evaporator as the target, the opening of the throttling device is controlled by PI, and the frequency of the fluorine pump is gradually reduced so that the throttling device is gradually adjusted to the maximum opening.

[0064] After the fluorine pump 4 (or the fluorine pump system) is successfully started, the opening of the throttling device 11 is controlled to increase linearly with time until the throttling device 11 reaches the maximum opening; or, the opening of the throttling device 11 is controlled to increase nonlinearly with time until the maximum opening; or, with the suction superheat at the outlet of the evaporator 10 as the target, the opening of the throttling device 11 is controlled by PI (proportional integral) (PI control means: a control deviation is formed based on a given value and an actual output value, and the proportion and integral of the deviation are linearly combined to form a control quantity to control the controlled object), and the frequency of the fluorine pump 4 is gradually reduced so that the throttling device 11 is gradually adjusted to the maximum opening.

[0065] It should be understood that the opening of the throttling device 11 can also be controlled in other ways to gradually reach the maximum opening.

[0066] The control method provided by the embodiment of the present disclosure, through the control means combined with the bypass line 6 design between the liquid storage tank 3 and the outlet of the fluorine pump 4, can enable the fluorine pump 4 to start at a high frequency and a large flow rate, thereby improving the success rate of starting. Moreover, by reducing the opening of the throttling device 11, the excess refrigerant flow can be circulated through the bypass line 6, thereby preventing the excessive refrigerant flow in the fluorine pump refrigeration circuit from causing liquid accumulation in the compressor 9, thereby solving the problem of the fluorine pump 4 being difficult to start and the compressor 9 being easily filled with liquid. After the fluorine pump 4 is successfully started, the throttling device 11 is adjusted to the maximum opening through a certain control logic, and the operating frequency of the fluorine pump 4 is reduced, thereby achieving an energy-saving effect. That is, the control method of the present disclosure adopts the high success rate control of "high frequency (fluorine pump), small opening (throttling device)" during startup, and gradually changes to the high energy-saving control of "small frequency (fluorine pump), large opening (throttling device)" after startup, so that the fluorine pump system will run to a more energy-saving state after startup is completed.

[0067] In some exemplary embodiments, before adjusting the fluorine pump to the first preset speed or the first preset frequency, the control method further includes: controlling the condensing fan to operate at a second preset speed.

[0068] Before the fluorine pump 4 is started, the condensing fan 16 can be controlled to have a pre-action. For example, when the fluorine pump 4 is not turned on, the condensing fan 16 can be controlled to run at the second speed to use the condensing fan 16 to blow cold air on the condenser 1, and then adjust the frequency or speed of the fluorine pump 4 and the opening of the throttling device 11 to start it.

[0069] Before the fluorine pump 4 is started, the condensing fan 16 is controlled to cool the condenser 1, which is beneficial to reducing the temperature of the refrigerant in the condenser 1 and the temperature of the refrigerant flowing from the condenser 1 to the liquid storage tank 3, and thus helps to increase the supercooling degree at the inlet of the fluorine pump 4 and avoid the interruption of the fluorine pump 4.

[0070] In some exemplary embodiments, before adjusting the fluorine pump to the first preset speed or the first preset frequency, the control method further includes: controlling the evaporation fan to operate at a third preset speed.

[0071] The third preset speed is not greater than the second preset speed.

[0072] Before the fluorine pump 4 is started, the evaporation fan 17 can be controlled to have a pre-action, for example: when the fluorine pump 4 is not turned on, the evaporation fan 17 can be controlled to run at the third speed, so that the indoor air can flow through the evaporator 10 and exchange heat with the evaporator 10, which is beneficial to increase the superheat at the outlet of the evaporator 10 (that is, the air inlet of the compressor 9) and avoid liquid in the compressor 9.

[0073] Before the fluorine pump 4 is started, the condensing fan 16 and the evaporating fan 17 are controlled to rotate, wherein the rotation speed of the condensing fan 16 is generally larger, such as: the second preset speed can be 30%-100% of the rated speed (maximum speed) of the condensing fan 16, specifically, the second preset speed can be 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100% and the like of the rated speed of the condensing fan 16; the rotation speed of the evaporating fan 17 can be set to be less than or equal to the rotation speed of the condensing fan 16, such as: the third preset speed can be set to the rated speed (maximum speed) of the evaporating fan 17 or other speeds.

[0074] Of course, before the fluorine pump 4 is started, the evaporation fan 17 can also be set to not rotate.

[0075] In some embodiments, as shown in FIG3 , the control method mainly coordinates the rotation speed of the fluorine pump 4 and the opening degree of the throttling device 11 to achieve a rapid start-up of the fluorine pump system without liquid, and to enable the system to run to a high-energy state after starting. The specific control process is as follows:

[0076] After receiving the fluorine pump start instruction, the fluorine pump is turned on to a certain higher speed (i.e., a first preset speed, such as the rated speed) fp_s, and the opening of the throttling device 11 is set to EEV (ΔT, fp_s) based on fp_s and the difference ΔT (ΔT = Th - Tc) between the return air temperature Th of the evaporator (or evaporating fan) and the return air temperature Tc of the condenser (or condensing fan);

[0077] When the pressure difference △P (△P=Pout-Pin) between the outlet pressure Pout and the inlet pressure Pin of the fluorine pump is greater than the set value △P_s, it is determined that the startup is completed;

[0078] After the startup is completed, the speed of the fluorine pump is PID controlled with the suction superheat as the control target, and the opening of the throttling device is gradually opened to the maximum opening according to a certain rule.

[0079] After receiving the fluorine pump start-up instruction and before starting the fluorine pump, the condensing fan can be opened to a larger specific speed (second preset speed) fc, and the evaporating fan can be opened to a specific speed (third preset speed) fv.

[0080] The embodiments of the present disclosure also provide a control device, including a processor and a memory storing a computer program. When the processor executes the computer program, the steps of the control method in any of the above embodiments are implemented, thereby having all the above-mentioned beneficial effects, which will not be repeated here.

[0081] 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. The processor can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present disclosure. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0082] The disclosed embodiment further provides a dual-circulation refrigeration system, which, in addition to including the aforementioned dual-circulation refrigeration circuit, may also include a control device as in the aforementioned embodiment, and thus has all the aforementioned beneficial effects, which will not be elaborated herein.

[0083] In some exemplary embodiments, referring to Figures 4 to 8 , the liquid reservoir 3, the fluorine pump 4, and the bypass line 6 may constitute a fluorine pump assembly or an anti-interruption liquid supply device for a dual-cycle refrigeration system. The liquid reservoir 3 includes a liquid inlet 31, a liquid outlet 32, and a liquid return port 33. The liquid inlet 31 of the liquid reservoir 3 is configured to be connected to the condenser 1 of the dual-cycle refrigeration system via an inlet pipe 2, so that the liquid inlet 31 is in fluid communication with the condenser 1. The liquid outlet 32 ​​of the liquid reservoir 3 is connected to the inlet of the fluorine pump 4 via an outlet pipe 5, so that the liquid outlet 32 ​​is in fluid communication with the inlet of the fluorine pump 4. The outlet of the fluorine pump 4 is configured to be connected to the evaporator 10 via the throttling device 11 of the dual-cycle refrigeration system, so that the outlet of the fluorine pump 4, the throttling device 11, and the evaporator 10 are in fluid communication. One end of the bypass line 6 is connected to the liquid return port 33 of the liquid reservoir 3, and the other end is connected to the outlet of the fluorine pump 4, so that the liquid return port 33 is in fluid communication with the outlet of the fluorine pump 4. The fluorine pump 4 may be a centrifugal pump.

[0084] The liquid storage tank 3 is connected between the condenser 1 and the fluorine pump 4, and the fluorine pump 4 is used to pressurize the refrigerant received from the liquid storage tank 3 and then transmit it to the evaporator 10. In the fluorine pump refrigeration mode, when the refrigerant pressure in the system drops rapidly (such as when the fluorine pump 4 is interrupted, causing the refrigerant pressure to drop rapidly), the saturation temperature corresponding to the refrigerant in the liquid storage tank 3 also drops; and the temperature drop rate in the liquid storage tank 3 is significantly lower than the pressure drop rate, causing the refrigerant in the liquid storage tank 3 to become a state with a temperature higher than the saturation temperature, thereby evaporating to produce gas-liquid two-phases, and the refrigerant is vaporized, causing cavitation in the fluorine pump 4, and the liquid level inside the liquid storage tank 3 drops. In the embodiment of the present disclosure, a bypass pipe 6 is set from the outlet of the fluorine pump 4 to the return liquid port 33 of the liquid storage tank 3. Due to the high pressure at the outlet of the fluorine pump 4, a part of the refrigerant can flow back from the outlet of the fluorine pump 4 to the liquid storage tank 3 through the bypass pipe 6, thereby increasing the liquid level in the liquid storage tank 3, and a part of the refluxed refrigerant can be vaporized in the liquid storage tank 3. The pressure in the liquid storage tank 3 increases to slow down or inhibit the vaporization of the refrigerant and prevent cavitation and interruption of the fluorine pump 4; the other part of the refrigerant can flow from the outlet of the fluorine pump 4 through the throttling device 11 to the evaporator 10 to circulate in the fluorine pump refrigeration circuit.

[0085] The fluorine pump assembly of the disclosed embodiment addresses the problem that the fluorine pump (centrifugal pump) 4 is prone to flow interruption. By connecting the outlet of the fluorine pump 4 to the return liquid port 33 of the liquid storage tank 3, the high pressure at the outlet of the fluorine pump 4 is utilized to slow down or suppress the refrigerant vaporization caused by the sudden drop in pressure in the liquid storage tank 3, thereby greatly improving the ability of the fluorine pump refrigeration circuit to resist flow interruption, solving the problem that the fluorine pump (centrifugal pump) in the fluorine pump refrigeration circuit is prone to flow interruption and failure in some cases, and greatly improving the operating reliability of the fluorine pump refrigeration circuit.

[0086] Compared with the technical solution in some cases of connecting a bypass line between the evaporator and the liquid storage tank of the dual-circulation refrigeration system to return the liquid refrigerant in the evaporator to the liquid storage tank, in the embodiment of the present disclosure, a bypass line 6 is connected between the outlet of the fluorine pump 4 and the return liquid port 33 of the liquid storage tank 3. In this way, when the dual-circulation refrigeration system is in the fluorine pump refrigeration mode and the fluorine pump 4 is used to provide power for the refrigerant circulation, the pressure at the outlet of the fluorine pump 4 is the highest. Returning the high-pressure refrigerant at the outlet of the fluorine pump 4 to the liquid storage tank 3 through the bypass line 6 can better slow down or inhibit the vaporization of the refrigerant in the liquid storage tank 3 and prevent the fluorine pump 4 from cavitation and interruption of flow. Since the pressure at the outlet of the fluorine pump 4 is the highest, the refrigerant in the liquid storage tank 3 will not flow back to the outlet of the fluorine pump 4 through the bypass line 6. Therefore, there is no need to set a one-way valve or other components on the bypass line 6 to prevent backflow in the bypass line 6, which is conducive to simplifying the structure of the fluorine pump assembly and reducing the cost of the fluorine pump assembly.

[0087] In addition, the liquid storage tank 3 and the fluorine pump 4 are usually arranged in the outdoor unit of the dual-circulation refrigeration system, while the evaporator 10 is usually arranged in the indoor unit of the dual-circulation refrigeration system. Compared with connecting a bypass line between the evaporator of the indoor unit and the liquid storage tank of the outdoor unit, which leads to disadvantages such as the bypass line being too long and the flow resistance in the bypass line being large, in the embodiment of the present disclosure, a bypass line 6 is connected between the liquid storage tank 3 and the fluorine pump 4 of the outdoor unit. The bypass line 6 is shorter, and the resistance to the backflow of the liquid refrigerant in the bypass line 6 is small, which is conducive to the return of part of the refrigerant at the outlet of the fluorine pump 4 to the liquid storage tank 3, thereby achieving the effect of slowing down or inhibiting the vaporization of the refrigerant in the liquid storage tank 3 and preventing the fluorine pump 4 from cavitation and interruption of flow.

[0088] In some exemplary embodiments, the geometric characteristics of the bypass line 6 satisfy at least one of the following two formulas: Formula (1): Formula (2):

[0089] Among them, d is the inner diameter (inner diameter) of the bypass pipe 6, D is the inner diameter of the connecting pipe between the outlet of the fluorine pump 4 and the throttling device 11 (that is, the inner diameter of the liquid pipe connected between the indoor unit and the outdoor unit of the dual-circulation refrigeration system), and L is the length of the bypass pipe 6.

[0090] By limiting the inner diameter d and length L of bypass line 6, the resistance (pressure) within bypass line 6 can be limited, thereby controlling the amount of refrigerant flowing back into the liquid storage tank 3 through bypass line 6. If the resistance within bypass line 6 is too low, most of the refrigerant flowing out of the outlet of fluorine pump 4 will flow back into the liquid storage tank 3, and none will flow to the evaporator 10, resulting in a reduced amount of refrigerant in the fluorine pump refrigeration circuit and high energy consumption. If the resistance within bypass line 6 is too high, less refrigerant will flow back into the liquid storage tank 3 from the outlet of fluorine pump 4, and the liquid level and pressure in the liquid storage tank 3 will not be effectively increased, thus failing to achieve the purpose of preventing cavitation and flow interruption. By limiting the inner diameter d and length L of bypass line 6 through the above two formulas, the resistance within bypass line 6 is appropriately limited. On the one hand, the pressure in the liquid storage tank 3 is maintained within a certain range, preventing refrigerant vaporization and flow interruption of fluorine pump 4, while on the other hand, a sufficient amount of refrigerant flows to the evaporator 10, enabling the normal operation of the fluorine pump refrigeration circuit.

[0091] Formula (2) is primarily based on the pressure typically used in the fluorine pump refrigeration circuit. Formula (2) does not limit the inner diameter D of the connecting pipe between the outlet of the fluorine pump 4 and the throttling device 11. Compared to formula (2), formula (1) limits the inner diameter D of the connecting pipe between the outlet of the fluorine pump 4 and the throttling device 11. By limiting the resistance (pressure) in the bypass line 6 and the fluorine pump refrigeration circuit, it can be applied to situations where the fluorine pump refrigeration circuit has different pressures, making the fluorine pump assembly more applicable.

[0092] The dual-cycle refrigeration system of the embodiment of the present disclosure was used for testing experiments, and the experimental results are shown in Table 1.

[0093] Table 1

[0094] In Table 1, the equivalent

[0095] As can be seen from Table 1, when the geometric characteristics of the bypass line 6 satisfy formula (2), a good anti-flow interruption effect (preventing the fluorine pump 4 from interrupting flow) can be achieved, and a balance can be achieved between the power loss of the fluorine pump 4 and the anti-flow interruption effect. Similarly, according to the experimental results, when the geometric characteristics of the bypass line 6 satisfy formula (1), a balance can also be achieved between the power loss of the fluorine pump 4 and the anti-flow interruption effect.

[0096] In some exemplary embodiments, as shown in FIG. 4 and FIG. 7 to FIG. 8 , in the liquid storage tank 3 , the liquid return port 33 may be close to the liquid inlet 31 and away from the liquid outlet 32 ​​.

[0097] The return liquid port 33 is far away from the liquid outlet 32, which can prevent the refrigerant returning through the bypass pipe 6 from flowing directly out of the liquid outlet 32. This will affect the effect of the returning refrigerant on increasing the liquid level and pressure of the liquid storage tank 3, and thus fail to achieve the purpose of preventing cavitation and preventing flow interruption.

[0098] In some exemplary embodiments, as shown in FIG. 4 and FIG. 8 , the liquid inlet 31 and the liquid outlet 32 ​​may be disposed at the bottom of the liquid storage tank 3 , and the liquid return port 33 may be disposed at the top of the liquid storage tank 3 .

[0099] A liquid return port 33 is provided at the top of the liquid storage tank 3, and a bypass line 6 is connected between the outlet of the fluorine pump 4 and the liquid return port 33 of the liquid storage tank 3. Since the top of the liquid storage tank 3 is a gas phase region, part of the high-pressure refrigerant at the outlet of the fluorine pump 4 can flow back into the gas phase region of the liquid storage tank 3 through the bypass line 6. Since the pressure (gas pressure) within the liquid storage tank 3 is lower than the pressure of the returning refrigerant, part of the returning refrigerant can be vaporized at the liquid return port 33 of the liquid storage tank 3, thereby slowing down or suppressing the pressure (gas pressure) drop in the liquid storage tank 3, making the saturation temperature of the refrigerant in the liquid storage tank 3 higher, slowing down or suppressing the vaporization of the liquid refrigerant in the liquid storage tank 3, and also suppressing the gas phase pressure drop in the liquid storage tank 3 caused by dynamic changes in the device (such as: an increase in the speed of the condensing fan 16), thereby avoiding cavitation of the fluorine pump 4. In addition, another part of the returning refrigerant does not vaporize after entering the liquid storage tank 3 but remains in liquid form, causing the liquid level in the liquid storage tank 3 to rise.

[0100] Therefore, in the disclosed embodiment, on the one hand, the high-pressure refrigerant flowing back into the gas phase region of the liquid storage tank 3 is vaporized to slow down or suppress the drop in the gas phase pressure in the liquid storage tank 3, thereby achieving a high degree of subcooling of the refrigerant in the liquid storage tank 3 and slowing down or suppressing the vaporization of the liquid refrigerant in the liquid storage tank 3. On the other hand, the liquid level in the liquid storage tank 3 is raised by replenishing the liquid refrigerant flowing back into the liquid storage tank 3. The dual functions of the returning refrigerant: suppressing the drop in the gas phase pressure of the liquid storage tank 3 and replenishing the liquid refrigerant, thereby preventing cavitation in the fluorine pump 4.

[0101] Liquid outlet 32 ​​is located at the bottom of liquid storage tank 3, and liquid return port 33 is located at the top of liquid storage tank 3. Liquid return port 33 is located closer to the side of liquid inlet 31 than liquid outlet 32, thereby extending liquid return port 33 away from liquid outlet 32 ​​and enhancing the effect of the refrigerant returning. Furthermore, liquid outlet 32 ​​is located at the bottom of liquid storage tank 3, facilitating the refrigerant's accumulation at liquid outlet 32, allowing the refrigerant to flow smoothly downward to the inlet of fluorine pump 4, reducing resistance and reducing refrigerant vaporization.

[0102] In some exemplary embodiments, as shown in Figures 4 and 8, the first end of the inlet pipe 2 connected to the liquid storage tank 3 extends into the liquid storage tank 3 and is close to the top of the liquid storage tank 3, the second end of the outlet pipe 5 connected to the liquid storage tank 3 is close to the bottom of the liquid storage tank 3, and the vertical distance S1 from the third end of the bypass line 6 connected to the liquid storage tank 3 to the first end of the inlet pipe 2 is less than the vertical distance S2 to the second end of the outlet pipe 5.

[0103] The height of the first end of the inlet pipe 2, which connects to the liquid storage tank 3, is higher than the height of the second end of the outlet pipe 5, which connects to the liquid storage tank 3. When the fluorine pump refrigeration circuit is operating normally, the liquid level H in the liquid storage tank 3 (see FIG. 4 , where H can be the rated liquid level of the liquid storage tank 3 or a preset maximum liquid level) is lower than the height of the first end of the inlet pipe 2 and higher than the height of the second end of the outlet pipe 5. The first end of the inlet pipe 2 being higher than the liquid level H in the liquid storage tank 3 prevents refrigerant from the liquid storage tank 3 backflowing into the condenser 1 through the inlet pipe 2 when the pressure in the condenser 1 is lower than the pressure in the liquid storage tank 3. The second end of the outlet pipe 5 being lower than the liquid level H in the liquid storage tank 3 facilitates the outflow of refrigerant from the liquid storage tank 3 through the outlet pipe 5. Furthermore, the second end of the outlet pipe 5 can be close to the bottom of the liquid storage tank 3, so that when the amount of refrigerant in the liquid storage tank 3 is low, the outlet pipe 5 can still be immersed in the liquid refrigerant, thereby transporting the liquid refrigerant to the fluorine pump 4 and preventing the fluorine pump 4 from losing head due to a failure of the liquid seal to form a flow interruption.

[0104] It should be understood that the liquid storage tank 3 is not limited to the above-mentioned liquid inlet 31 and liquid outlet 32 ​​being located at the bottom of the liquid storage tank 3 and the liquid return port 33 being located at the top of the liquid storage tank 3 , and other situations are also possible.

[0105] For example, in other exemplary embodiments, as shown in FIG. 5 and FIG. 6 , the liquid inlet 31 and the liquid outlet 32 ​​may be disposed at the bottom of the liquid storage tank 3 , and the liquid return port 33 may be disposed at the side of the liquid storage tank 3 .

[0106] The liquid return port 33 is provided on the side of the liquid storage tank 3, that is, the bypass line 6 is connected to the side of the liquid storage tank 3. The provision of the bypass line 6 can also guide part of the refrigerant flowing out of the outlet of the fluorine pump 4 back to the liquid storage tank 3, thereby preventing the occurrence of cavitation and flow interruption problems of the fluorine pump 4. The liquid return port 33 provided on the side of the liquid storage tank 3 can be higher than the liquid level height H in the liquid storage tank 3 (the liquid level height H can be the rated liquid level height of the liquid storage tank 3 or the preset maximum liquid level height), so that part of the high-pressure refrigerant at the outlet of the fluorine pump 4 can flow back to the gas phase area of ​​the liquid storage tank 3 through the bypass line 6.

[0107] Furthermore, as shown in FIG. 5 and FIG. 6 , the liquid return port 33 may be provided on a side of the liquid outlet 32 ​​away from the liquid inlet 31 .

[0108] The liquid return port 33 is arranged on the side of the liquid outlet 32 ​​away from the liquid inlet 31. Compared with the case where the liquid return port 33 is arranged on the side of the liquid outlet 32 ​​close to the liquid inlet 31, this arrangement is conducive to shortening the length L of the bypass line 6 so as to adjust the resistance of the bypass line 6, thereby preventing cavitation and interruption of the fluorine pump 4 and ensuring low energy consumption of the fluorine pump refrigeration circuit.

[0109] For example, in some further exemplary embodiments, as shown in FIG. 7 , the liquid inlet 31 , the liquid outlet 32 ​​and the liquid return port 33 may all be disposed on the top of the liquid storage tank 3 .

[0110] The liquid inlet 31, liquid outlet 32 ​​and liquid return port 33 are all arranged at the top of the liquid storage tank 3, and can also guide part of the refrigerant flowing out of the outlet of the fluorine pump 4 to flow back to the liquid storage tank 3 through the bypass pipe 6, so as to prevent the fluorine pump 4 from cavitation and interruption of flow.

[0111] Furthermore, as shown in FIG. 7 , the liquid return port 33 may be disposed between the liquid outlet 32 ​​and the liquid inlet 31 , and the liquid return port 33 may be close to the liquid inlet 31 and away from the liquid outlet 32 ​​.

[0112] The liquid return port 33 is disposed between the liquid outlet 32 ​​and the liquid inlet 31. That is, the liquid inlet 31, the liquid return port 33, and the liquid outlet 32 ​​are arranged in sequence at the top of the liquid storage tank 3. The liquid return port 33 is closer to the liquid inlet 31 than the liquid outlet 32. This arrangement takes into account the length L of the bypass line 6 and the distances between the liquid return port 33 and the liquid inlet 31 and the liquid outlet 32, thereby effectively preventing cavitation and flow interruption of the fluorine pump 4.

[0113] In the embodiments shown in Figures 4 to 6, the liquid storage tank 3 is in an inverted manner, and the liquid inlet 31 and the liquid outlet 32 ​​are both located at the bottom of the liquid storage tank 3. In the embodiment shown in Figure 7, the liquid storage tank 3 is upright, and the liquid inlet 31 and the liquid outlet 32 ​​are both located at the top of the liquid storage tank 3.

[0114] In some exemplary embodiments, as shown in Figures 4 to 8, the length of the first end of the inlet pipe 2 connected to the liquid storage tank 3 extending into the liquid storage tank 3 is set to be greater than or equal to the length of the second end of the outlet pipe 5 connected to the liquid storage tank 3 extending into the liquid storage tank 3; and / or, the height of the first end of the inlet pipe 2 connected to the liquid storage tank 3 is set to be not lower than the height of the second end of the outlet pipe 5 connected to the liquid storage tank 3; and / or, the first end of the inlet pipe 2 connected to the liquid storage tank 3 may be close to the top or bottom of the liquid storage tank 3, and the second end of the outlet pipe 5 connected to the liquid storage tank 3 may be close to the bottom of the liquid storage tank 3.

[0115] As shown in Figures 4, 5 and 8, the liquid outlet 32 ​​and the liquid inlet 31 can be set at the bottom of the liquid storage tank 3, and the length of the first end of the inlet pipe 2 connected to the liquid storage tank 3 extending into the liquid storage tank 3 can be greater than the length of the second end of the outlet pipe 5 connected to the liquid storage tank 3 extending into the liquid storage tank 3, so that the first end of the inlet pipe 2 is close to the top of the liquid storage tank 3, the second end of the outlet pipe 5 is close to the bottom of the liquid storage tank 3, and the height of the first end of the inlet pipe 2 is higher than the height of the second end of the outlet pipe 5.

[0116] As shown in Figure 6, the inlet pipe 2 and the outlet pipe 5 can be connected to the liquid storage tank 3 from the liquid inlet 31 and the liquid outlet 32 ​​at the bottom of the liquid storage tank 3 respectively, and the length of the first end of the inlet pipe 2 connected to the liquid storage tank 3 extending into the liquid storage tank 3 can be roughly equal to the length of the second end of the outlet pipe 5 connected to the liquid storage tank 3 extending into the liquid storage tank 3, the first end of the inlet pipe 2 and the second end of the outlet pipe 5 can both be close to the bottom of the liquid storage tank 3, and the height of the first end of the inlet pipe 2 can be roughly flush with the height of the second end of the outlet pipe 5.

[0117] As shown in Figure 7, the inlet pipe 2 and the outlet pipe 5 can be extended into the liquid storage tank 3 from the liquid inlet 31 and the liquid outlet 32 ​​at the top of the liquid storage tank 3 respectively, and the length of the first end of the inlet pipe 2 connected to the liquid storage tank 3 extending into the liquid storage tank 3 can be roughly equal to the length of the second end of the outlet pipe 5 connected to the liquid storage tank 3 extending into the liquid storage tank 3, the first end of the inlet pipe 2 and the second end of the outlet pipe 5 can both be close to the bottom of the liquid storage tank 3, and the height of the first end of the inlet pipe 2 can be roughly flush with the height of the second end of the outlet pipe 5.

[0118] Although the liquid storage tank 3 shown in the above exemplary embodiment is horizontal (placed horizontally), it should be understood that the liquid storage tank 3 may also be vertical (placed vertically).

[0119] In some exemplary embodiments, as shown in FIG. 8 , the bypass line 6 may be provided with a bypass valve 8 for controlling the on-off state of the bypass line 6 .

[0120] Bypass valve 8 controls the on / off switching of bypass line 6. Bypass valve 8 can be opened when fluorine pump 4 is started, and closed when fluorine pump 4 is operating normally after startup. This reduces the amount of refrigerant flowing back from the outlet of fluorine pump 4 into liquid storage tank 3, thereby increasing the amount of refrigerant flowing in the fluorine pump refrigeration circuit, thereby making the fluorine pump refrigeration circuit more energy-efficient and improving the cooling effect. Bypass valve 8 can be a manual valve or an electric valve, such as a solenoid valve.

[0121] In some exemplary embodiments, as shown in FIG. 4 to FIG. 8 , a safety valve 7 may be provided on the top of the liquid storage tank 3 .

[0122] The safety valve 7 is arranged at the top of the liquid storage tank 3. When the pressure in the liquid storage tank 3 is too high and exceeds the rated safety value, the safety valve 7 can automatically release the pressure to ensure the safety of the system.

[0123] The embodiments of the present disclosure further provide a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the control method as in any one of the above embodiments is implemented, thereby having all the above-mentioned beneficial effects, which will not be repeated here.

[0124] In the description of the present disclosure, 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 disclosure 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 disclosure.

[0125] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include at least one of these features.

[0126] In this disclosure, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, "connected" can mean fixed connection, detachable connection, or integration; mechanical connection, or electrical connection; direct connection, indirect connection through an intermediate medium, or internal communication between two elements or interaction between two elements, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0127] In the present disclosure, 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.

[0128] In the description of this specification, the description with reference to the terms "some embodiments", "examples", "specific examples", 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 some embodiments or examples of the present disclosure. 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.

[0129] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

[0130] 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 transmission 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 the embodiments of the present disclosure. A computer program product may include a computer-readable medium.

[0131] 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.

[0132] 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.

[0133] 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 control method for a dual-circulation refrigeration system, wherein a bypass pipeline is connected between the outlet of a fluorine pump of the dual-circulation refrigeration system and a liquid storage tank, and a throttling device is provided on the pipeline connected between the outlet of the fluorine pump and an evaporator of the dual-circulation refrigeration system; the control method comprises: Based on the received fluorine pump start instruction, adjusting the fluorine pump to a first preset speed or a first preset frequency, and adjusting the throttling device to a first preset opening; Based on the pressure difference between the outlet and the inlet of the fluorine pump being greater than the preset pressure difference, the fluorine pump is started; The first preset opening degree is set to be determined according to the first preset rotation speed or the first preset frequency, and according to the indoor and outdoor temperature difference.

2. The control method according to claim 1, wherein: The first preset opening is set to be negatively correlated with the first preset rotation speed or the first preset frequency.

3. The control method according to claim 1, wherein: The first preset opening degree is set to be positively correlated with the indoor and outdoor temperature difference.

4. The control method according to claim 1, further comprising: After the fluorine pump is started up, the rotation speed or frequency of the fluorine pump is PID controlled with the suction superheat at the outlet of the evaporator as the target.

5. The control method according to claim 1, further comprising: After the fluorine pump is started up, the throttling device is gradually adjusted to the maximum opening.

6. The control method according to claim 5, wherein: The step of gradually adjusting the throttling device to a maximum opening degree comprises: Controlling the opening of the throttling device to increase linearly over time until reaching the maximum opening; or Controlling the opening of the throttling device to increase non-linearly over time until the maximum opening; or Taking the suction superheat at the outlet of the evaporator as the target, the opening of the throttling device is PI controlled, and the frequency of the fluorine pump is gradually reduced so that the throttling device is gradually adjusted to the maximum opening.

7. The control method according to any one of claims 1 to 6, wherein: Before adjusting the fluorine pump to the first preset speed or the first preset frequency, the control method further includes: The condensing fan is controlled to run at a second preset speed.

8. The control method according to claim 7, wherein: Before adjusting the fluorine pump to the first preset speed or the first preset frequency, the control method further includes: controlling the evaporation fan to operate at a third preset speed; The third preset rotation speed is not greater than the second preset rotation speed.

9. A control device, comprising a processor and a memory storing a computer program, wherein the processor implements the steps of the control method according to any one of claims 1 to 8 when executing the computer program.

10. A dual-cycle refrigeration system, comprising: A double-circulation refrigeration circuit includes a fluorine pump and a liquid storage tank, wherein a bypass pipeline is connected between the outlet of the fluorine pump and the liquid storage tank; and The control device according to claim 9 is configured to control the operation of the dual-cycle refrigeration circuit.

11. The dual-cycle refrigeration system according to claim 10, wherein: The dual-cycle refrigeration circuit also includes: A compressor, a condenser, an evaporator and a throttling device, wherein the compressor, the condenser, the liquid storage tank, the fluorine pump, the throttling device and the evaporator are sequentially connected through pipelines to form a loop; a compressor bypass flow path connected in parallel with the compressor and a first check valve provided on the compressor bypass flow path; and A fluorine pump bypass flow path connected in parallel with the fluorine pump and a second one-way valve arranged on the fluorine pump bypass flow path.

12. The dual-cycle refrigeration system according to claim 11, wherein: The geometric characteristics of the bypass pipeline meet at least one of the following two conditions: and Wherein, d is the inner diameter of the bypass pipeline, D is the inner diameter of the connecting pipeline between the outlet of the fluorine pump and the throttling device, and L is the length of the bypass pipeline.

13. The dual-cycle refrigeration system according to claim 11, wherein: The liquid storage tank includes a liquid return port connected to the bypass pipeline, and the liquid return port is arranged at the top of the liquid storage tank, or the liquid return port is arranged on the side of the liquid storage tank and is higher than the rated liquid level height or the preset maximum liquid level height of the liquid storage tank.

14. The dual-cycle refrigeration system according to claim 11, wherein: The liquid storage tank comprises a liquid inlet connected to the condenser, a liquid outlet connected to the inlet of the fluorine pump, and a liquid return port connected to the bypass pipeline, wherein: The liquid inlet and the liquid outlet are both arranged at the bottom of the liquid storage tank, and the liquid return port is arranged at the top of the liquid storage tank, and the liquid return port is close to the liquid inlet and away from the liquid outlet; or The liquid inlet and the liquid outlet are both arranged at the bottom of the liquid storage tank, the liquid return port is arranged at the side of the liquid storage tank, and the liquid return port is arranged at a side of the liquid outlet away from the liquid inlet; or The liquid inlet, the liquid outlet and the liquid return port are all arranged on the top of the liquid storage tank, the liquid return port is arranged between the liquid outlet and the liquid inlet, and the liquid return port is close to the liquid inlet and away from the liquid outlet.

15. The binary cycle refrigeration system according to claim 11, wherein: An inlet pipe is connected between the condenser and the liquid inlet of the liquid storage tank, and an outlet pipe is connected between the liquid outlet of the liquid storage tank and the inlet of the fluorine pump, wherein: The length of the first end of the inlet pipe connected to the liquid storage tank extending into the liquid storage tank is set to be greater than or equal to the length of the second end of the outlet pipe connected to the liquid storage tank extending into the liquid storage tank; and / or The height of the first end of the inlet pipe connected to the liquid storage tank is set to be no lower than the height of the second end of the outlet pipe connected to the liquid storage tank; and / or The first end of the inlet pipe connected to the liquid storage tank is close to the top or bottom of the liquid storage tank, and the second end of the outlet pipe connected to the liquid storage tank is close to the bottom of the liquid storage tank.

16. The binary cycle refrigeration system according to any one of claims 10 to 15, wherein: The bypass pipeline is provided with a bypass valve for controlling the on-off of the bypass pipeline.

17. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the control method according to any one of claims 1 to 8.

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