Dual-cycle refrigeration system, control method, control device, and storage medium

Abstract

The application discloses a double-circulation refrigeration system, a control method, a control device and a storage medium. The double-circulation refrigeration system comprises a compressor, a condenser, a fluorine pump, a throttling device and an evaporator connected in sequence, a fluorine pump bypass flow path connected in parallel with the fluorine pump and a bypass valve for controlling the on-off of the fluorine pump bypass flow path, and a control valve with a first valve port, a second valve port, a third valve port and a fourth valve port, wherein the first valve port, the second valve port, the third valve port and the fourth valve port are connected with the suction port, the exhaust port, the inlet of the condenser and the outlet of the evaporator one by one respectively; the control valve has a first working state and a second working state, in the first working state, the first valve port and the fourth valve port are in conduction, and the second valve port and the third valve port are in conduction; in the second working state, the first valve port and the second valve port are in conduction, and the third valve port and the fourth valve port are in conduction. The double-circulation refrigeration system avoids the risk of liquid accumulation of the compressor when the fluorine pump is in variable working condition by adding the control valve.

Description

TECHNICAL FIELD

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

[0002] In the double-circulation refrigeration system (fluorine pump air conditioning unit), the compressor and the fluorine pump are connected in series in the system, and when the fluorine pump is in variable working condition (such as starting and frequency rising), the refrigerant at the outlet of the evaporator may be in a gas-liquid two-phase state, and the two-phase refrigerant entering the compressor will cause liquid accumulation in the compressor, which will affect the reliability of the compressor. SUMMARY

[0003] The present application provides a double-circulation refrigeration system, which avoids the risk of liquid accumulation in the compressor when the fluorine pump is in variable working condition by additionally arranging a control valve.

[0004] The double-circulation refrigeration system provided by the present application comprises:

[0005] The compressor has an exhaust port and a suction port;

[0006] The condenser, the fluorine pump, the throttling device and the evaporator are connected in sequence;

[0007] The fluorine pump bypass flow path is connected in parallel with the fluorine pump, and the bypass valve is arranged to control the on-off of the fluorine pump bypass flow path; and

[0008] The control valve has a first valve port, a second valve port, a third valve port and a fourth valve port, and the first valve port, the second valve port, the third valve port and the fourth valve port are connected with the suction port, the exhaust port, the inlet of the condenser and the outlet of the evaporator respectively in one-to-one correspondence;

[0009] The control valve has a first working state and a second working state, in the first working state, the first valve port and the fourth valve port are in conduction, and the second valve port and the third valve port are in conduction; in the second working state, the first valve port and the second valve port are in conduction, and the third valve port and the fourth valve port are in conduction.

[0010] The present application further provides a control method for the double-circulation refrigeration system.

[0011] Receiving a mode instruction;

[0012] Based on the received mode instruction being the fluorine pump mode, the control valve is controlled to be in the second working state, and the double-circulation refrigeration system is controlled to enter the fluorine pump mode;

[0013] Based on the received mode instruction being the compressor mode, the control valve is controlled to be in the first working state, and the double-cycle refrigeration system is controlled to enter the compressor mode.

[0014] The embodiment of the present application further provides a control device, including a processor and a memory storing a computer program, and the processor implements the steps of the control method when executing the computer program.

[0015] The embodiment of the present application further provides a computer readable storage medium storing a computer program, and the computer program is executed by a processor to implement the control method.

[0016] The double-cycle refrigeration system provided by the embodiment of the present application, when the control valve is in the first working state, realizes the compressor mode refrigeration; when the control valve is in the second working state, realizes the fluorine pump mode refrigeration. In the compressor mode, the first valve port of the control valve in the first working state can be communicated with the fourth valve port, and the second valve port can be communicated with the third valve port, at this time, the compressor, the control valve, the condenser, the fluorine pump bypass flow path, the throttling device and the evaporator can form a compressor refrigeration circuit, and the refrigerant can pass through the discharge port of the compressor, the control valve (the second valve port-the third valve port), the condenser, the bypass valve, the throttling device, the evaporator, the control valve (the fourth valve port-the first valve port) and the suction port of the compressor in sequence. In the compressor mode, the fluorine pump is stopped, and the compressor is started to provide power for the refrigerant in the compressor refrigeration circuit.

[0017] In the fluorine pump mode, the first valve port of the control valve in the second working state can be communicated with the second valve port, and the third valve port can be communicated with the fourth valve port, at this time, the fluorine pump, the throttling device, the evaporator, the control valve and the condenser can form a fluorine pump refrigeration circuit, and the refrigerant can pass through the outlet of the fluorine pump, the throttling device, the evaporator, the control valve (the fourth valve port-the third valve port), the condenser and the inlet of the fluorine pump in sequence. In the fluorine pump mode, the compressor is stopped, and the fluorine pump is started to provide power for the refrigerant in the fluorine pump refrigeration circuit.

[0018] When the fluorine pump mode is running, the control valve is switched to the second working state to isolate the compressor from the fluorine pump refrigeration circuit, so that the gas-liquid two-phase state refrigerant discharged from the outlet of the evaporator does not enter the suction port of the compressor, and the compressor liquid accumulation problem is caused. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The structure schematic diagram of the double-cycle refrigeration system provided by some embodiments of the present application is shown, wherein the double-cycle refrigeration system is in the compressor mode;

[0020] Figure 2A flowchart of a double-circulation refrigeration system in a fluorine pump mode is provided for some embodiments of the present application.

[0021] Figure 3 A flowchart of a control method of a double-circulation refrigeration system is provided for one embodiment of the present application.

[0022] In the drawings, the components represented by the reference numbers are listed as follows:

[0023] 1-compressor; 11-discharge port; 12-suction port; 2-control valve; 21-first valve port; 22-second valve port; 23-third valve port; 24-fourth valve port; 3-condenser; 4-condensing fan; 5-fluorine pump; 6-bypass valve; 7-throttling device; 8-evaporator; 9-evaporating fan; 10-fluorine pump bypass flow path. DETAILED DESCRIPTION

[0024] The principles and features of the present application are described below in conjunction with the accompanying drawings, and the examples are only used to explain the present application and not to limit the scope of the present application.

[0025] An embodiment of the present application provides a double-circulation refrigeration system, as shown in Figure 1 and Figure 2 , comprising a compressor 1, a condenser 3, a fluorine pump 5, a throttling device 7, an evaporator 8, a fluorine pump bypass flow path 10, a bypass valve 6, and a control valve 2.

[0026] The compressor 1 has a discharge port 11 and a suction port 12, and the condenser 3, the fluorine pump 5, the throttling device 7, and the evaporator 8 can be connected in sequence. The fluorine pump bypass flow path 10 can be connected in parallel with the fluorine pump 5, and the bypass valve 6 can control the on-off of the fluorine pump bypass flow path 10.

[0027] The control valve 2 can have a first valve port 21, a second valve port 22, a third valve port 23, and a fourth valve port 24, which can be connected one-to-one with the suction port 12, the discharge port 11, the inlet of the condenser 3, and the outlet of the evaporator 8, respectively.

[0028] The control valve 2 can have a first working state and a second working state, as shown in Figure 1 , in the first working state, the first valve port 21 can be conductive with the fourth valve port 24, and the second valve port 22 can be conductive with the third valve port 23; as shown in Figure 2 , in the second working state, the first valve port 21 can be conductive with the second valve port 22, and the third valve port 23 can be conductive with the fourth valve port 24.

[0029] The double-circulation refrigeration system of the embodiment of the application mainly comprises a compressor 1, a fluorine pump 5, an evaporator 8, a condenser 3, a throttling device 7, a control valve 2, a fluorine pump bypass flow path 10, a bypass valve 6, the outlet of the condenser 3 is communicated with the inlet of the fluorine pump 5, the outlet of the fluorine pump 5 is communicated with one end of the throttling device 7, the other end of the throttling device 7 is communicated with the inlet of the evaporator 8, the fluorine pump bypass flow path 10 can be arranged in parallel with the fluorine pump 5, the bypass valve 6 is arranged in the fluorine pump bypass flow path 10 and controls the on-off of the fluorine pump bypass flow path 10. The control valve 2 has four valve ports: a first valve port 21, a second valve port 22, a third valve port 23 and a fourth valve port 24, and the four valve ports are respectively connected with the suction port 12 of the compressor 1, the exhaust port 11 of the compressor 1, the inlet of the condenser 3 and the outlet of the evaporator 8 one by one.

[0030] As shown in Figure 1 , the double-circulation refrigeration system realizes compressor mode refrigeration when the control valve 2 is in the first working state; as shown in Figure 2 , the double-circulation refrigeration system realizes fluorine pump mode refrigeration when the control valve 2 is in the second working state. As shown in Figure 1 , in the compressor mode, the first valve port 21 of the control valve 2 in the first working state can be conducted with the fourth valve port 24, and the second valve port 22 can be conducted with the third valve port 23, at this time, the compressor 1, the control valve 2, the condenser 3, the fluorine pump bypass flow path 10, the throttling device 7 and the evaporator 8 can form a compressor refrigeration circuit, and the refrigerant can pass through the exhaust port 11 of the compressor 1-control valve 2 (the second valve port 22-the third valve port 23)-the condenser 3-the bypass valve 6-the throttling device 7-the evaporator 8-control valve 2 (the fourth valve port 24-the first valve port 21)-the suction port 12 of the compressor 1 in sequence. In the compressor mode, the fluorine pump 5 is stopped, and the compressor 1 is started to provide power for the refrigerant running in the compressor refrigeration circuit.

[0031] As shown in Figure 2 , in the fluorine pump mode, the first valve port 21 of the control valve 2 in the second working state can be conducted with the second valve port 22, and the third valve port 23 can be conducted with the fourth valve port 24, at this time, the fluorine pump 5, the throttling device 7, the evaporator 8, the control valve 2 and the condenser 3 can form a fluorine pump refrigeration circuit, and the refrigerant can pass through the outlet of the fluorine pump 5-the throttling device 7-the evaporator 8-control valve 2 (the fourth valve port 24-the third valve port 23)-the condenser 3-the inlet of the fluorine pump 5 in sequence. In the fluorine pump mode, the compressor 1 is stopped, and the fluorine pump 5 is started to provide power for the refrigerant running in the fluorine pump refrigeration circuit.

[0032] As shown in Figure 2 , when the fluorine pump mode is running, the control valve 2 is switched to the second working state to isolate the compressor 1 from the fluorine pump refrigeration circuit, so as to avoid the gas-liquid two-phase state refrigerant discharged from the outlet of the evaporator 8 from entering the suction port 12 of the compressor 1, causing liquid accumulation in the compressor 1 and causing reliability problems of the compressor 1.

[0033] In some example embodiments, the control valve 2 can include a driving element and a valve body, the valve body can include a movable valve core, and the driving element can be connected with the valve core and configured to drive the valve core to move so as to switch the control valve 2 between the first working state and the second working state.

[0034] The driving element can be an electric driving element, which can be electrically connected with a control device of the dual-cycle refrigeration system so that the dual-cycle refrigeration system controls the operation of the electric driving element, and in turn controls the control valve 2 to be in the first working state or the second working state, so as to switch the dual-cycle refrigeration system between the fluorine pump mode and the compressor mode.

[0035] In some example embodiments, the driving element can include a driving motor, which can drive the valve core to rotate or move so as to switch the control valve 2 between the first working state and the second working state.

[0036] In some example embodiments, as shown in Figure 1 and Figure 2 , the bypass valve 6 is a one-way valve, which is configured to be one-way conducted according to the direction from the outlet of the condenser 3 to the inlet of the evaporator 8.

[0037] In some example embodiments, the throttling device 7 can be a throttling valve, such as an electronic expansion valve, and the flow of the refrigerant flowing to the evaporator 8 can be adjusted by controlling the opening of the electronic expansion valve.

[0038] In some example embodiments, as shown in Figure 1 and Figure 2 , the dual-cycle refrigeration system further includes a condenser fan 4 and an evaporator fan 9, the condenser fan 4 is configured to generate an airflow flowing through the condenser 3 when working, and the evaporator fan 9 is configured to generate an airflow flowing through the evaporator 8 when working.

[0039] In some example embodiments, the condenser fan 4 can be arranged on one side of the condenser 3 and used to drive outdoor air to flow through the condenser 3, and the evaporator fan 9 can be arranged on one side of the evaporator 8 and used to drive indoor air to flow through the evaporator 8.

[0040] In some example embodiments, as shown in Figure 1 and Figure 2 , the control valve 2 can be a four-way valve with four valve ports.

[0041] The embodiments of the present application also provide a control method for the dual-cycle refrigeration system provided by any of the above embodiments. As shown in Figure 3 , the control method includes:

[0042] S202: receiving a mode instruction;

[0043] S204: Based on the received mode command being the refrigerant pump mode, the control valve is in the second operating state and the compressor is shut down, and then the refrigerant pump is started; based on the received mode command being the compressor mode, the control valve is in the first operating state and the refrigerant pump is shut down, and then the compressor is started.

[0044] The control method of this application embodiment is used in a dual-cycle refrigeration system including a control valve 2 with four valve ports. When the received mode command is refrigerant pump mode, the control valve 2 is adjusted to a second operating state (e.g., Figure 2 As shown, compressor 1 is isolated from the refrigerant pump refrigeration circuit, and compressor 1 is also controlled to be in a shut-off state before refrigerant pump 5 is started, so that the dual-cycle refrigeration system enters refrigerant pump mode for refrigeration. In this refrigerant pump mode, compressor 1 is stopped, and refrigerant pump 5 starts to provide power for refrigerant operation.

[0045] When the mode command is received as compressor mode, control valve 2 is adjusted to the first operating state (e.g., Figure 1 As shown in the diagram, compressor 1 is connected to the compressor refrigeration circuit at this time, and refrigerant pump 5 is also controlled to be in the off state. Then, compressor 1 is started to put the dual-cycle refrigeration system into compressor mode for refrigeration. In this compressor mode, refrigerant pump 5 is stopped, and compressor 1 is started to provide power for the refrigerant to run.

[0046] In this control method, during the process of controlling the dual-cycle refrigeration system to enter compressor mode or refrigerant pump mode, the control valve 2 is first adjusted to the first working state or the second working state, and the refrigerant pump 5 or compressor 1 is turned off. Then, the compressor 1 or refrigerant pump 5 is started to realize the dual-cycle refrigeration system to enter compressor mode or refrigerant pump mode, thus avoiding the problem of liquid accumulation in compressor 1 and thus affecting the reliability of compressor 1.

[0047] In some exemplary embodiments, the control method further includes: based on the received mode command being a fluorine pump mode, controlling the throttling device to a first preset opening degree before starting the fluorine pump.

[0048] The first preset opening degree can be 10%-50% of the rated opening degree (maximum opening degree of the throttling device 7) of the throttling device 7, such as: the first preset opening degree can be 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50% of the rated opening degree, etc.

[0049] Before starting the refrigerant pump 5 in refrigerant pump mode, control valve 2 can be adjusted to... Figure 2 In the second operating state shown, compressor 1 is turned off, and the throttling device 7 is adjusted to the first preset opening degree before starting the refrigerant pump 5 to achieve successful startup of the refrigerant pump 5. In the refrigerant pump mode, the bypass valve 6 is in the closed state.

[0050] Of course, the first preset opening degree is not limited to 10%-50% of the rated opening degree, and can be adjusted as needed.

[0051] In some example embodiments, the control method further comprises: based on the received mode instruction being the compressor mode, controlling the throttling device to be at the second preset opening degree before starting the compressor.

[0052] The second preset opening degree is 10%-50% of the rated opening degree of the throttling device 7, such as 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, or 50% of the rated opening degree. The first preset opening degree and the second preset opening degree can be equal or unequal.

[0053] Before starting the compressor 1 in the compressor mode, the control valve 2 can be adjusted to Figure 1 the first working state shown in the figure, the fluorine pump 5 is closed, and the throttling device 7 is adjusted to the second preset opening degree, and then the compressor 1 is started, so as to realize the successful start of the compressor 1. In the compressor mode, the bypass valve 6 is in the on state.

[0054] Of course, the second preset opening degree is not limited to 10%-50% of the rated opening degree, and can be adjusted as needed.

[0055] In some example embodiments, the control method further comprises: issuing a mode instruction based on the indoor and outdoor temperature parameters.

[0056] According to the indoor and outdoor temperature parameters (temperature parameters of indoor and outdoor air), the dual-circuit refrigeration system is controlled to enter the fluorine pump mode or the compressor mode, so that when the outdoor temperature is low, the natural cold source outside is used, the fluorine pump 5 is used instead of the compressor 1 to provide power for the refrigerant circulation, the energy consumption of the dual-circuit refrigeration system is reduced, and the energy-saving effect is realized.

[0057] In some example embodiments, the step of issuing a mode instruction based on the indoor and outdoor temperature parameters comprises:

[0058] When the indoor and outdoor temperature parameters satisfy a first preset condition, the issued mode instruction is the fluorine pump mode;

[0059] When the indoor and outdoor temperature parameters satisfy a second preset condition, the issued mode instruction is the compressor mode.

[0060] The first preset condition includes that the outdoor temperature is less than a first preset temperature T1, and the indoor and outdoor temperature difference is greater than a first preset temperature difference ΔT1; and the second preset condition includes that the outdoor temperature is greater than a second preset temperature T2, or the indoor and outdoor temperature difference is less than a second preset temperature difference ΔT2.

[0061] When the outdoor temperature (the temperature of outdoor air) is low and the indoor-outdoor temperature difference (the temperature difference between indoor air and outdoor air) is large, the double-cycle refrigeration system can be controlled to enter the fluorine pump mode so as to make full use of the natural cold source of the outdoor to cool the indoor, and since the power of the fluorine pump 5 is far less than the power of the compressor 1, the power consumption of the double-cycle refrigeration system can be significantly reduced, thus achieving a significant energy-saving effect.

[0062] When the outdoor temperature is high or the indoor-outdoor temperature difference is small, the natural cold source of the outdoor cannot be used to cool the indoor, and therefore the double-cycle refrigeration system can be controlled to enter the compressor mode so as to use the work of the compressor 1 to achieve refrigeration.

[0063] The double-cycle refrigeration system of the embodiments of the present application can mainly adopt the compressor mode when the outdoor temperature is high in summer and mainly adopt the fluorine pump mode when the outdoor temperature is low in winter, thus achieving the purposes of energy saving and emission reduction.

[0064] In some example embodiments, T1 < T2.

[0065] T1 < T2 can avoid frequent switching of the double-cycle refrigeration system between the fluorine pump mode and the compressor mode, so that the double-cycle refrigeration system runs smoothly.

[0066] In some example embodiments, ΔT1 > ΔT2.

[0067] ΔT1 is large, i.e., the indoor-outdoor temperature difference is large, and the natural cold source of the outdoor can be used to cool the indoor; ΔT2 is small, i.e., the indoor-outdoor temperature difference is large, and the natural cold source of the outdoor cannot be used to cool the indoor, but the work of the compressor 1 is used to achieve refrigeration.

[0068] In some example embodiments, the value range of T1 is 0-10℃, the value range of ΔT1 is 20℃-30℃, the value range of the difference between T2 and T1 is 1℃-10℃, and the value range of the difference between ΔT1 and ΔT2 is 1℃-10℃.

[0069] The value range of T1 can be 0-10℃, such as 1℃, 2℃, 3℃, 4℃, 5℃, 6℃, 7℃, 8℃, 9℃, 10℃, etc.

[0070] The value range of ΔT1 can be 20℃-30℃, such as 20℃, 21℃, 22℃, 23℃, 24℃, 25℃, 26℃, 27℃, 28℃, 29℃, 30℃, etc.

[0071] The value range of the difference between T2 and T1 can be 1℃-10℃, i.e., the value range of T2 is 1℃-20℃, such as 1℃, 3℃, 5℃, 8℃, 10℃, 12℃, 15℃, 18℃, 20℃, etc.

[0072] The difference between ΔT1 and ΔT2 is in the range of 1℃-10℃, that is, the value of ΔT2 is in the range of 10℃-29℃, for example, the value of ΔT2 can be 10℃, 13℃, 15℃, 18℃, 20℃, 22℃, 25℃, 27℃, 29℃, etc.

[0073] It should be understood that the value range of T1, T2, ΔT1 and ΔT2 is not limited to the above, and can be adjusted according to actual needs.

[0074] The embodiment of the present application also provides a control device, comprising a processor and a memory storing a computer program, and the processor implements the steps of the control method provided by any of the above embodiments when executing the computer program.

[0075] The processor can be an integrated circuit chip with a processing capability of signals. The processor described above can be a general processor, including a central processing unit (CPU), a network processor (NP), etc.; or can be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a ready programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The disclosed methods, steps and logic block diagrams in the embodiments of the present application can be implemented or executed by the processor. The general processor can be a microprocessor or the processor can also be any conventional processor.

[0076] The embodiment of the present application also provides a computer readable storage medium storing a computer program, and the computer program is executed by the processor to implement the control method provided by any of the above embodiments.

[0077] In summary, the double-circulation refrigeration system provided by the embodiment of the present application mainly comprises a compressor 1, a fluorine pump 5, an evaporator 8, a condenser 3, a throttling device 7, a control valve 2, a bypass valve 6, etc. When the control valve 2 is in the first working state (as shown in Figure 1 ), the compressor mode refrigeration is realized, and when the control valve 2 is in the second working state (as shown in Figure 2 ), the fluorine pump mode refrigeration is realized.

[0078] In the compressor mode, the refrigerant flows through the compressor 1, the control valve 2, the condenser 3, the bypass valve 6, the throttling device 7, the evaporator 8, the control valve 2 and the compressor 1 in sequence. In the fluorine pump mode, the refrigerant flows through the fluorine pump 5, the throttling device 7, the evaporator 8, the control valve 2, the condenser 3 and the fluorine pump 5 in sequence. The compressor 1 and the fluorine pump 5 can drive the refrigerant to circulate in the closed compressor refrigeration circuit and the fluorine pump refrigeration circuit, thereby forming a double-circulation refrigeration system. The evaporator 8 and the evaporating fan 9 are arranged on the indoor side, and the evaporator 8 is used to absorb heat in the room. The condenser 3 and the condensing fan 4 are arranged on the outdoor side, and the condenser 3 is used to dissipate the heat absorbed by the evaporator 8 to the environment outside the room.

[0079] When the outdoor temperature < T1 and the indoor-outdoor temperature difference > ΔT1, the compressor 1 is closed, the control valve 2 is switched to the second working state, the throttling device 7 is opened to the initial opening degree (the first preset opening degree) of the fluorine pump mode, and the fluorine pump 5 is started, so as to realize the switching from the compressor mode to the fluorine pump mode (or the fluorine pump mode from the standby mode).

[0080] When the outdoor temperature > T2 or the indoor-outdoor temperature difference < ΔT2, the fluorine pump 5 is closed, the control valve 2 is switched to the first working state, the throttling device 7 is opened to the initial opening degree (the second preset opening degree) of the compressor mode, and the compressor 1 is started, so as to realize the switching from the fluorine pump mode to the compressor mode (or the compressor mode from the standby mode). Wherein, T1 < T2, ΔT1 > ΔT2.

[0081] In addition to the compressor mode and the fluorine pump mode, the double-circulation refrigeration system can also have a mixed mode. In the mixed mode, the bypass valve 6 is in the closed state, and the control valve 2 is in the first working state. At this time, the compressor 1, the control valve 2, the condenser 3, the fluorine pump 5, the throttling device 7 and the evaporator 8 form a mixed refrigeration circuit, and the refrigerant can flow through the exhaust port 11 of the compressor 1, the second valve port 22 of the control valve 2, the third valve port 23 of the control valve 2, the condenser 3, the fluorine pump 5, the throttling device 7, the evaporator 8, the fourth valve port 24 of the control valve 2, the first valve port 21 of the control valve 2 and the suction port 12 of the compressor 1 in sequence. In the mixed mode, the fluorine pump 5 and the compressor 1 are both started, part of the outdoor natural cold source is utilized, the fluorine pump 5 can compensate the circulating power of the refrigerant in the mixed refrigeration circuit, reduce the pressure loss of the refrigerant in the circulating process, make the compressor 1 work in the best working condition, reduce the energy consumption of the compressor 1, improve the refrigeration efficiency, and have a certain energy-saving effect.

[0082] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and steps, therefore, cannot be understood as limiting the present application.

[0083] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0084] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0085] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0086] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples, without contradiction.

[0087] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and those of ordinary skill in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

[0088] In any one or more of the example embodiments described above, the functions described can be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions can be stored or transmitted over as one or more instructions or code on a computer-readable medium and executed by a hardware-based processing unit. Computer-readable media can include computer-readable storage media, which corresponds to a tangible medium such as data storage media, or communication media including any medium that facilitates transfer of a computer program from one place to another, e.g., according to a communication protocol. In this manner, computer-readable media generally can correspond to non-transitory computer- readable storage media or communication media such as signals or carrier waves. Data storage media can be any available media that can be accessed by one or more computers or one or more processors to retrieve instructions, code and / or data structures for implementation of the techniques described in this disclosure. A computer program product can include a computer-readable medium.

[0089] By way of example, and not limitation, such computer-readable storage media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage, or other magnetic storage devices, 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. Also, any connection is properly termed a computer-readable medium. For example, if the software is 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 microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. It should be understood, however, that computer-readable storage media and data storage media do not include connections, carrier waves, signals, or other transient media, but are instead directed to non-transient, tangible storage media. Disk and disc, as used herein, includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0090] Instructions can be executed by one or more processors, such as one or more digital signal processors (DSPs), general purpose microprocessors, application specific integrated circuits (ASICs), field programmable logic arrays (FPGAs), or other equivalent integrated or discrete logic circuitry. Accordingly, the term "processor," as used herein can refer to any of the foregoing structure or any other structure suitable for implementation of the techniques described herein. In addition, in some aspects, the functionality described herein can be provided within dedicated hardware and / or software modules configured for encoding and decoding, or incorporated in a combined codec. Also, the techniques could be fully implemented in one or more circuits or logic elements.

[0091] The technical solutions of the embodiments of the present disclosure can be implemented in a wide variety of devices or apparatuses, including a wireless mobile phone, an integrated circuit (IC) or a set of ICs (e.g., a chip set). Various components, modules, or units described in the embodiments of the present disclosure can be implemented as hardware, software, or a combination thereof. The various components, modules, or units described in the embodiments of the present disclosure can be implemented as software interactive with a processor, or as a combination of software and hardware.

Claims

1. A dual-cycle refrigeration system, characterized in that, include: The compressor has an exhaust port and an intake port; The condenser, refrigerant pump, throttling device, and evaporator are connected in sequence. A bypass flow path for the fluorine pump connected in parallel with the fluorine pump and a bypass valve for controlling the opening and closing of the bypass flow path for the fluorine pump; as well as The control valve has a first valve port, a second valve port, a third valve port, and a fourth valve port, wherein the first valve port, the second valve port, the third valve port, and the fourth valve port are respectively connected to the suction port, the exhaust port, the inlet of the condenser, and the outlet of the evaporator; The control valve has a first working state and a second working state. In the first working state, the first valve port is connected to the fourth valve port, and the second valve port is connected to the third valve port. In the second working state, the first valve port is connected to the second valve port, and the third valve port is connected to the fourth valve port. The dual-cycle refrigeration system further includes a control device configured to perform the following steps: Receive mode command; Based on the received mode command being the refrigerant pump mode, the control valve is controlled to enter the second operating state and the compressor is shut down, and then the refrigerant pump is started; Based on the received mode command being compressor mode, the control valve is controlled to be in the first working state and the refrigerant pump is shut off, and then the compressor is started.

2. The dual-cycle refrigeration system according to claim 1, characterized in that, The control valve includes a drive element and a valve body. The valve body includes a movable valve core. The drive element is connected to the valve core and is configured to drive the valve core to move, so that the control valve switches between a first operating state and a second operating state.

3. The dual-cycle refrigeration system according to claim 1 or 2, characterized in that, The bypass valve is a one-way valve, and the one-way valve is configured to allow one-way flow from the outlet of the condenser to the inlet of the evaporator. The dual-cycle refrigeration system further includes a condenser fan and an evaporator fan. The condenser fan is configured to generate airflow through the condenser when it is working, and the evaporator fan is configured to generate airflow through the evaporator when it is working.

4. A control method, characterized in that, For the dual-cycle refrigeration system according to any one of claims 1 to 3, the control method comprises: Receive mode command; Based on the received mode command being the refrigerant pump mode, the control valve is controlled to enter the second operating state and the compressor is shut down, and then the refrigerant pump is started; Based on the received mode command being compressor mode, the control valve is controlled to be in the first working state and the refrigerant pump is shut off, and then the compressor is started.

5. The control method according to claim 4, characterized in that, Also includes: Based on the received mode command being in fluorine pump mode, before starting the fluorine pump, the throttling device is controlled to be at a first preset opening degree. Based on the received mode command being compressor mode, the throttling device is controlled to be at a second preset opening degree before starting the compressor.

6. The control method according to claim 5, characterized in that, The first preset opening is 10%-50% of the rated opening, and the second preset opening is 10%-50% of the rated opening.

7. The control method according to any one of claims 4 to 6, characterized in that, Also includes: The mode command is issued based on indoor and outdoor temperature parameters.

8. The control method according to claim 7, characterized in that, The issuance of the mode command based on indoor and outdoor temperature parameters includes: Based on the indoor and outdoor temperature parameters meeting the first preset condition, the issued mode command is the refrigerant pump mode; Based on the fact that the indoor and outdoor temperature parameters meet the second preset condition, the issued mode command is the compressor mode; The first preset condition includes: the outdoor temperature is less than the first preset temperature T1, and the indoor-outdoor temperature difference is greater than the first preset temperature difference ΔT1. The second preset condition includes: the outdoor temperature is greater than the second preset temperature T2, or the indoor-outdoor temperature difference is less than the second preset temperature difference ΔT2.

9. The control method according to claim 8, characterized in that, T1 < T2, ΔT1 > ΔT2.

10. The control method according to claim 9, characterized in that, The value of T1 ranges from 0 to 10℃, the value of ΔT1 ranges from 20℃ to 30℃, the value of the difference between T2 and T1 ranges from 1℃ to 10℃, and the value of the difference between ΔT1 and ΔT2 ranges from 1℃ to 10℃.

11. A control device, characterized in that, It includes a processor and a memory storing a computer program, wherein the processor executes the computer program to implement the steps of the control method as described in any one of claims 4 to 10.

12. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the control method as described in any one of claims 4 to 10.

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