Control method and device of double-circulation refrigeration system, double-circulation refrigeration system

Abstract

The application discloses a control method and device of a double-circulation refrigeration system and the double-circulation refrigeration system. The method comprises the following steps: when it is determined that the refrigeration mode needs to be switched from a first refrigeration mode to a second refrigeration mode, a frequency adjustment instruction is sent to a compressor, the first refrigeration mode is a refrigeration mode driven by the compressor, the second refrigeration mode is a refrigeration mode driven by a fluorine pump, and the frequency adjustment instruction is used for instructing the compressor to reduce the operating frequency; after the compressor responds to the frequency adjustment instruction, the current liquid level of a liquid storage tank is acquired, the liquid storage tank is used for storing refrigerant; and when the current liquid level reaches a predetermined liquid level, a start instruction is sent to the fluorine pump, and the start instruction is used for instructing the fluorine pump to enter an operating mode. The application solves the technical problem that in the double-circulation refrigeration system in which the fluorine pump and the compressor are connected in series, the fluorine pump is prone to cavitation or no-load during the switching process from the compressor operation to the fluorine pump operation, and the stability of the air conditioner is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliance control, in particular to a control method and device of a double-circulation refrigeration system and the double-circulation refrigeration system. BACKGROUND

[0002] Since the computer room equipment generates a large amount of heat and is operated all year round, it needs to be refrigerated throughout the year. In order to save energy and reduce emissions, many air conditioner manufacturers have developed double-circulation system air conditioners with compressors and fluorine pumps. In the case of high outdoor temperature in summer, the mode of compressor refrigeration is mainly adopted, and in the case of low outdoor temperature in winter, the mode of fluorine pump refrigeration is mainly adopted, so as to achieve the purpose of energy saving. In the double-circulation refrigeration system in which the fluorine pump and the compressor are connected in series, there is a mutual switching between the compressor operation mode and the fluorine pump operation mode. During the switching process from the compressor operation to the fluorine pump operation, the pressure of the whole system is reduced, which is easy to cause the fluorine pump to cavitate or be unloaded, and seriously affects the service life of the fluorine pump.

[0003] In view of the problem in the related art that in the double-circulation refrigeration system in which the fluorine pump and the compressor are connected in series, during the switching process from the compressor operation to the fluorine pump operation, the fluorine pump is easy to cavitate or be unloaded, and the stability of the air conditioner is reduced, no effective solution has been proposed so far. SUMMARY

[0004] The embodiments of the present application provide a control method and device of a double-circulation refrigeration system and the double-circulation refrigeration system, at least to solve the technical problem in the related art that in the double-circulation refrigeration system in which the fluorine pump and the compressor are connected in series, during the switching process from the compressor operation to the fluorine pump operation, the fluorine pump is easy to cavitate or be unloaded, and the stability of the air conditioner is reduced.

[0005] According to an aspect of the embodiments of the present application, a control method of a double-circulation refrigeration system is provided, including: when it is determined that the refrigeration mode needs to be switched from a first refrigeration mode to a second refrigeration mode, sending a frequency adjustment instruction to a compressor, wherein the first refrigeration mode is a refrigeration mode driven by the compressor, the second refrigeration mode is a refrigeration mode driven by a fluorine pump, and the frequency adjustment instruction is used to instruct the compressor to reduce the operation frequency; after the compressor responds to the frequency adjustment instruction, acquiring a current liquid level of a liquid storage tank, wherein the liquid storage tank is used to store refrigerant; when the current liquid level reaches a predetermined liquid level, sending a start instruction to the fluorine pump, wherein the start instruction is used to instruct the fluorine pump to enter an operation mode.

[0006] Optionally, determining that the refrigeration mode needs to be switched from the first refrigeration mode to the second refrigeration mode includes: acquiring a current outdoor temperature; when the current outdoor temperature is lower than a preset temperature, determining that the refrigeration mode needs to be switched from the first refrigeration mode to the second refrigeration mode.

[0007] Optionally, the control method of the dual-cycle refrigeration system further comprises: sending an opening degree adjustment instruction to the throttling component while sending the frequency adjustment instruction to the compressor, wherein the opening degree adjustment instruction is used to instruct to reduce the opening degree of the throttling component, and the throttling component is used to adjust the flow of the refrigerant flowing out of the liquid storage tank.

[0008] Optionally, the control method of the dual-cycle refrigeration system further comprises: triggering the first one-way valve on the first bypass circuit to close to turn on the refrigeration circuit in the second refrigeration mode when the start instruction is sent to the fluorine pump, wherein the first bypass circuit is connected in parallel with the fluorine pump.

[0009] Optionally, the control method of the dual-cycle refrigeration system further comprises: triggering the second one-way valve on the second bypass circuit to open and closing the compressor to close the refrigeration circuit in the first refrigeration mode after determining that the fluorine pump responds to the start instruction for a predetermined time length, wherein the second bypass circuit is connected in parallel with the compressor.

[0010] Optionally, the control method of the dual-cycle refrigeration system further comprises: obtaining indoor temperature change information during the refrigeration mode is switched from the first refrigeration mode to the second refrigeration mode; and adjusting the opening degree of the throttling component based on the indoor temperature change information.

[0011] According to another aspect of the embodiments of the present application, a control device of a dual-cycle refrigeration system is also provided, comprising: a first sending unit configured to send a frequency adjustment instruction to a compressor when it is determined that the refrigeration mode needs to be switched from a first refrigeration mode to a second refrigeration mode, wherein the first refrigeration mode is a refrigeration mode driven by the compressor, the second refrigeration mode is a refrigeration mode driven by a fluorine pump, and the frequency adjustment instruction is used to instruct the compressor to reduce the operating frequency; a first obtaining unit configured to obtain a current liquid level of a liquid storage tank after the compressor responds to the frequency adjustment instruction, wherein the liquid storage tank is used to store refrigerant; and a second sending unit configured to send a start instruction to the fluorine pump when the current liquid level reaches a predetermined liquid level, wherein the start instruction is used to instruct the fluorine pump to enter an operating mode.

[0012] Optionally, the first sending unit comprises: a first obtaining module configured to obtain a current outdoor temperature; and a first determining module configured to determine that the refrigeration mode needs to be switched from the first refrigeration mode to the second refrigeration mode when the current outdoor temperature is lower than a preset temperature.

[0013] Optionally, the control device of the double-cycle refrigeration system further comprises a third sending unit configured to send an opening degree adjustment instruction to the throttling component while sending the frequency adjustment instruction to the compressor, wherein the opening degree adjustment instruction is used to instruct to reduce the opening degree of the throttling component, and the throttling component is used to adjust the flow of the refrigerant flowing out of the liquid storage tank.

[0014] Optionally, the control device of the double-cycle refrigeration system further comprises a first triggering unit configured to trigger the first one-way valve on the first bypass circuit to close when sending the start instruction to the fluorine pump, so as to turn on the refrigeration circuit in the second refrigeration mode, wherein the first bypass circuit is connected in parallel with the fluorine pump.

[0015] Optionally, the control device of the double-cycle refrigeration system further comprises a second triggering unit configured to trigger the second one-way valve on the second bypass circuit to open and the compressor to close when determining that the fluorine pump responds to the start instruction for a predetermined time length, so as to close the refrigeration circuit in the first refrigeration mode, wherein the second bypass circuit is connected in parallel with the compressor.

[0016] Optionally, the control device of the double-cycle refrigeration system further comprises a second obtaining unit configured to obtain indoor temperature change information during the refrigeration mode is switched from the first refrigeration mode to the second refrigeration mode; and an adjustment unit configured to adjust the opening degree of the throttling component based on the indoor temperature change information.

[0017] According to another aspect of the embodiments of the present application, a double-cycle refrigeration system is also provided, which uses the control method of the double-cycle refrigeration system according to any one of the above.

[0018] According to another aspect of the embodiments of the present application, an electrical appliance is also provided, which comprises the double-cycle refrigeration system according to any one of the above.

[0019] According to another aspect of the embodiments of the present application, a computer readable storage medium is also provided, which comprises a stored program, wherein the program performs the control method of the double-cycle refrigeration system according to any one of the above.

[0020] According to another aspect of the embodiments of the present application, a processor is also provided, which is used to run a program, wherein the program performs the control method of the double-cycle refrigeration system according to any one of the above.

[0021] In the embodiment of the present application, when it is determined that the refrigeration mode needs to be switched from the first refrigeration mode to the second refrigeration mode, a frequency adjustment instruction is sent to the compressor, wherein the first refrigeration mode is a refrigeration mode driven by the compressor, the second refrigeration mode is a refrigeration mode driven by the fluorine pump, and the frequency adjustment instruction is used to instruct the compressor to reduce the operating frequency; after the compressor responds to the frequency adjustment instruction, the current liquid level of the liquid storage tank is obtained, wherein the liquid storage tank is used to store the refrigerant; when the current liquid level reaches the predetermined liquid level, a start instruction is sent to the fluorine pump, wherein the start instruction is used to instruct the fluorine pump to enter the operating mode. Through the control method of the dual-cycle refrigeration system of the embodiment of the present application, the purpose that the fluorine pump is started only when the operating speed of the compressor is reduced to the predetermined liquid level of the liquid storage tank is achieved, the technical effect of improving the stability of the air conditioner during the refrigeration mode switching is achieved, the reliability of the air conditioner is improved, and the technical problem that the fluorine pump is easily cavitated or unloaded during the switching process from the compressor operation to the fluorine pump operation in the dual-cycle refrigeration system in which the fluorine pump and the compressor are connected in series is solved. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and together with the description serve to explain the present application. In the drawings:

[0023] Figure 1 is a flow chart of the control method of the dual-cycle refrigeration system according to the embodiment of the present application;

[0024] Figure 2 is a flow chart of the control method of the dual-cycle refrigeration system according to the embodiment of the present application;

[0025] Figure 3 is a schematic diagram of the control device of the dual-cycle refrigeration system according to the embodiment of the present application;

[0026] Figure 4 is a schematic diagram of the dual-cycle refrigeration system according to the embodiment of the present application;

[0027] Figure 5 is a schematic diagram of the electrical appliance according to the embodiment of the present application. DETAILED DESCRIPTION

[0028] In the following, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort should belong to the scope of the present application.

[0029] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in other than the order illustrated or described herein. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a list of steps or units need not be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to such processes, methods, products or devices.

[0030] Embodiment 1

[0031] According to the embodiments of the present application, a method embodiment of a control method of a dual-cycle refrigeration system is provided. It should be noted that the steps shown in the flowchart of the drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that shown herein.

[0032] Figure 1 is a flowchart of a control method of a dual-cycle refrigeration system according to the embodiments of the present application, as shown in Figure 1 The control method of the dual-cycle refrigeration system comprises the following steps:

[0033] Step S102, when it is determined that the refrigeration mode needs to be switched from the first refrigeration mode to the second refrigeration mode, a frequency adjustment instruction is sent to the compressor, wherein the first refrigeration mode is a refrigeration mode driven by the compressor, the second refrigeration mode is a refrigeration mode driven by the fluorine pump, and the frequency adjustment instruction is used to instruct the compressor to reduce the operating frequency.

[0034] Optionally, the dual-cycle refrigeration system of the embodiments of the present application can be applied in electric appliances such as air conditioners, refrigerators and the like. In this embodiment, an application in an air conditioner is taken as an example for description.

[0035] In an alternative embodiment, when it is determined that the cooling mode of the air conditioner needs to be switched from the compressor-driven cooling mode to the fluorine pump-driven cooling mode, an operation of sending a frequency adjustment instruction to the compressor is triggered to adjust the operating frequency of the compressor so that the air conditioner can be smoothly switched from the compressor-driven cooling mode to the fluorine pump-driven cooling mode.

[0036] In step S104, after the compressor responds to the frequency adjustment instruction, the current liquid level of the liquid storage tank is obtained, wherein the liquid storage tank is used to store the refrigerant.

[0037] In this embodiment, when the compressor receives the frequency adjustment instruction, it will respond to the frequency adjustment instruction to reduce the operating frequency of the compressor, and the current liquid level of the refrigerant in the liquid storage tank needs to be obtained to determine the starting time of the fluorine pump for subsequent determination.

[0038] In step S106, when the current liquid level reaches the predetermined liquid level, a start instruction is sent to the fluorine pump, wherein the start instruction is used to instruct the fluorine pump to enter the running mode.

[0039] In this embodiment, the start instruction can be sent to the fluorine pump when the liquid level of the refrigerant in the liquid storage tank reaches the predetermined liquid level to control the fluorine pump to start based on the start instruction.

[0040] From the above, in the embodiment of the present application, when the dual-cycle refrigeration system of the air conditioner needs to switch the cooling mode, i.e., when the dual-cycle refrigeration system of the air conditioner needs to switch from the compressor-driven cooling mode to the fluorine pump-driven cooling mode, the generation of the frequency adjustment instruction is triggered, and the frequency adjustment instruction is sent to the compressor to make the compressor reduce the operating frequency based on the frequency adjustment instruction, and at the same time, when the liquid level of the refrigerant in the liquid storage tank reaches the predetermined liquid level, a start instruction is sent to the fluorine pump to start the fluorine pump, which realizes the purpose that the fluorine pump is started only when the operating speed of the compressor is reduced to the point that the liquid level of the liquid storage tank reaches the predetermined liquid level, and achieves the technical effect of improving the stability of the air conditioner when switching the cooling mode, and improves the reliability of the air conditioner.

[0041] It is easy to note that since when the dual-cycle refrigeration system of the air conditioner needs to switch from the compressor-driven cooling mode to the fluorine pump-driven cooling mode, the operating speed of the compressor is first controlled to be reduced to the point that the liquid level of the refrigerant in the liquid storage tank reaches the predetermined liquid level, and then the fluorine pump is started, so that the cavitation or no-load of the fluorine pump during the running mode switching can be effectively avoided, which improves the stability and reliability of the air conditioning unit during the running mode switching.

[0042] Therefore, by the technical scheme provided in Embodiment 1 of the present application, the technical problem that the fluorine pump is prone to cavitation or idling during the switching process from the compressor operation to the fluorine pump operation in the double-cycle refrigeration system in which the fluorine pump and the compressor are connected in series, thereby reducing the stability of the air conditioner, is solved.

[0043] According to the above embodiment of the present application, determining that the refrigeration mode needs to be switched from the first refrigeration mode to the second refrigeration mode comprises: obtaining the current outdoor temperature; and determining that the refrigeration mode needs to be switched from the first refrigeration mode to the second refrigeration mode when the current outdoor temperature is lower than the preset temperature.

[0044] In this embodiment, the refrigeration mode needs to be switched from the first refrigeration mode to the second refrigeration mode only when the current outdoor temperature is lower than the preset temperature, that is, the refrigeration mode driven by the compressor is switched to the refrigeration mode driven by the fluorine pump.

[0045] For example, when the outdoor environment temperature is relatively low and the indoor environment temperature is relatively high, the natural cold source can be used for refrigeration, and the compressor does not need to be used for compression refrigeration. At this time, the fluorine pump can be used to drive the refrigerant in the pipeline to quickly exchange heat between the indoor and outdoor environments. At this time, only the electric energy used to drive the fluorine pump is needed to achieve the refrigeration purpose, and the electric energy required to drive the fluorine pump is much smaller than the electric energy required to drive the compressor, thereby saving a large amount of electric energy required to drive the compressor, and further saving electric energy.

[0046] According to the above embodiment of the present application, since the refrigerant required in the circuit of the double-cycle refrigeration system is reduced after the compressor reduces the operating frequency, the refrigerant in the circuit of the double-cycle refrigeration system needs to be reduced at this time. Therefore, the control method of the double-cycle refrigeration system further comprises: sending an opening degree adjustment instruction to the throttling component at the same time as sending the frequency adjustment instruction to the compressor, wherein the opening degree adjustment instruction is used to instruct to reduce the opening degree of the throttling component, and the throttling component is used to adjust the flow of the refrigerant flowing out of the liquid storage tank.

[0047] In this embodiment, when the frequency adjustment instruction is sent to the compressor to reduce the operating frequency of the compressor, the opening degree adjustment instruction can be sent to the throttling component at the same time to reduce the opening degree of the throttling component, thereby reducing the refrigerant in the circuit of the double-cycle refrigeration system, so that the liquid refrigerant in the condenser is forced to enter the liquid storage tank under the pressure of the double-cycle refrigeration system, and since the opening degree of the throttling component is reduced, the refrigerant flowing out of the liquid storage tank is reduced, thereby effectively preventing the flashing of the refrigerant in the liquid storage tank.

[0048] According to the above embodiment of the present application, the control method of the double-cycle refrigeration system further comprises: triggering the first one-way valve on the first bypass circuit to close when the start instruction is sent to the fluorine pump, so as to conduct the refrigeration circuit in the second refrigeration mode, wherein the first bypass circuit is connected in parallel with the fluorine pump.

[0049] In this embodiment, when the fluorine pump is controlled to be turned on, the one-way valve (i.e., the first one-way valve) of the fluorine pump bypass circuit (i.e., the first bypass circuit) can be closed, so that the cooling circuit in the fluorine pump refrigeration mode can be turned on, and at this time, the fluorine pump and the compressor are simultaneously operated.

[0050] According to the above-mentioned embodiments of the present application, the control method of the dual-cycle refrigeration system can further comprise: after determining that the duration of the fluorine pump responding to the start instruction reaches the predetermined duration, closing the compressor and triggering the second one-way valve on the second bypass circuit to open, so as to close the refrigeration circuit in the first refrigeration mode, wherein the second bypass circuit is connected in parallel with the compressor.

[0051] In this embodiment, when the duration of the fluorine pump and the compressor being simultaneously operated reaches the predetermined duration, it can be determined that the fluorine pump is completely turned on. When it is determined that the fluorine pump is completely started, the one-way valve (i.e., the second one-way valve) of the compressor bypass circuit (i.e., the second bypass circuit) is controlled to be opened, and at the same time, the compressor is closed, at this time, the fluorine pump refrigeration mode is completely entered. In this way, the influence of the sudden drop of the operating frequency of the compressor on the refrigeration mode switching can be effectively avoided.

[0052] According to the above-mentioned embodiments of the present application, the control method of the dual-cycle refrigeration system further comprises: during the switching of the refrigeration mode from the first refrigeration mode to the second refrigeration mode, obtaining indoor temperature change information; and adjusting the opening degree of the throttling component based on the indoor temperature change information.

[0053] In the embodiments of the present application, when the refrigeration mode is switched from the compressor-driven refrigeration mode to the fluorine pump-driven refrigeration mode, the opening degree of the throttling component is adjusted according to the temperature change of the room where the air conditioner is located, so as to complete the switching of the refrigeration mode. Since the temperature change of the room where the air conditioner is located is taken as a reference factor in real time when the refrigeration mode is switched, the opening degree of the throttling component is adjusted, and by adjusting the opening degree of the throttling component according to the temperature change during the operation of the air conditioner, the indoor temperature is kept within a certain change range, so that the user can have a more comfortable experience.

[0054] Figure 2 is a flow chart of an optional control method of a dual-cycle refrigeration system according to an embodiment of the present application, as Figure 2As shown, when it is determined that the refrigeration mode switching needs to be performed, and the switching operation is the refrigeration mode switching from the compressor-driven refrigeration mode to the fluorine pump-driven refrigeration mode, the frequency of the compressor is controlled to be reduced to prevent the sudden drop of the frequency of the compressor, the reduction of the system pressure, and the flashing of the refrigerant in the liquid tank caused by the reduction of the system pressure, and the opening degree of the throttling component can be controlled to be reduced to reduce the refrigerant in the system loop and to increase the liquid level of the refrigerant in the liquid tank; when the liquid level of the liquid tank is detected to be increased to the second preset liquid level (i.e., the predetermined liquid level), the fluorine pump is started, the one-way valve 1 (i.e., the first one-way valve) is closed, and after the predetermined time, the one-way valve 2 (i.e., the second one-way valve) is opened after the fluorine pump is completely started, the compressor is closed, and the opening degree of the throttling device (i.e., the throttling component) is adjusted according to the temperature change in the machine room where the air conditioner is located to complete the refrigeration mode switching.

[0055] As known from the above, in the embodiment of the present application, when the compressor operation mode needs to be switched to the fluorine pump operation mode, the operation frequency of the compressor is reduced by the control module (i.e., the control center of the double-circulation refrigeration system), and the opening degree of the throttling device is reduced; after the frequency of the compressor is reduced, the refrigerant needed in the system loop is reduced, the liquid refrigerant in the condenser is introduced into the liquid tank under the action of the system pressure, and the refrigerant from the liquid tank is reduced due to the reduction of the opening degree of the throttling device, so that the liquid level of the liquid tank is increased; when the control module detects that the liquid level of the liquid tank is increased to the second preset value, the control module controls the fluorine pump to be started and the one-way valve 1 of the fluorine pump bypass loop to be closed; at this time, the fluorine pump and the compressor are operated at the same time; when the fluorine pump is completely started, the control module controls the one-way valve 2 of the compressor bypass loop to be opened and the compressor to be closed, and adjusts the opening degree of the throttling device according to the temperature change in the machine room to complete the mode switching. In the whole mode switching process, the system pressure does not change too much, which avoids the flashing of the refrigerant in the liquid tank caused by the sudden reduction of the system pressure, thereby avoiding the cavitation at the inlet of the fluorine pump; at the same time, the temperature in the machine room does not change too much, which ensures the stable mode switching of the unit.

[0056] According to the technical scheme provided by the embodiment 1 of the present application, the stable switching of the compressor operation mode to the fluorine pump operation mode can be realized without increasing the connecting component, but only by logically controlling the double-circulation refrigeration system (controlling in a logical way, gradually adjusting each system component, which can make the air conditioner operation mode stably and reliably switch), that is, by adjusting the operation state of the compressor and the throttling device to adjust the liquid level of the liquid tank, to ensure the normal starting and operation of the fluorine pump, to effectively avoid the flashing of the refrigerant in the liquid tank caused by the reduction of the pressure of the refrigeration cycle system, and to effectively avoid the cavitation or no-load of the fluorine pump when the compressor operation mode is switched to the fluorine pump operation mode, thereby improving the stability and reliability of the air conditioning unit during the operation mode switching, and effectively reducing the influence on the service life of the fluorine pump.

[0057] It should be noted that for the foregoing method embodiments, the acts described can be performed in any order, and are not limited to the order described in the figures. Further, some of the acts can be performed simultaneously, or omitted. It should also be noted that the embodiments described in the specification are exemplary embodiments, and the acts and modules involved are not necessarily essential to the application.

[0058] Those skilled in the art can clearly understand that the method according to the above-mentioned embodiments can be realized by means of software and necessary general hardware platform, of course, it can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes a plurality of instructions for making a terminal device (which can be a mobile phone, computer, server, or network device, etc.) execute the methods described in the embodiments of the present application.

[0059] Embodiment 2

[0060] According to the embodiments of the present application, a control device of a double-circulation refrigeration system for implementing the control method of the double-circulation refrigeration system is further provided, Figure 3 is a schematic diagram of the control device of the double-circulation refrigeration system according to the embodiments of the present application, as Figure 3 shown, the device comprises a first sending unit 31, a first obtaining unit 33 and a second sending unit 35.

[0061] The first sending unit 31 is configured to send a frequency adjustment instruction to the compressor when it is determined that the refrigeration mode needs to be switched from the first refrigeration mode to the second refrigeration mode, wherein the first refrigeration mode is a refrigeration mode driven by the compressor, the second refrigeration mode is a refrigeration mode driven by the fluorine pump, and the frequency adjustment instruction is used to instruct the compressor to reduce the operating frequency.

[0062] The first obtaining unit 33 is configured to obtain the current liquid level of the liquid storage tank after the compressor responds to the frequency adjustment instruction, wherein the liquid storage tank is used to store the refrigerant.

[0063] The second sending unit 35 is configured to send a start instruction to the fluorine pump when the current liquid level reaches a predetermined liquid level, wherein the start instruction is used to instruct the fluorine pump to enter the operating mode.

[0064] It should be noted that the first sending unit 31, the first obtaining unit 33 and the second sending unit 35 correspond to steps S102 to S106 in Embodiment 1, and the three modules have the same instances and application scenarios as the corresponding steps, but are not limited to the contents disclosed in Embodiment 1.

[0065] As can be seen from the above, in the scheme described in Embodiment 2, when it is determined that the refrigeration mode needs to be switched from the first refrigeration mode to the second refrigeration mode, the first sending unit sends a frequency adjustment instruction to the compressor, wherein the first refrigeration mode is a refrigeration mode driven by the compressor, the second refrigeration mode is a refrigeration mode driven by the fluorine pump, and the frequency adjustment instruction is used to instruct the compressor to reduce the operating frequency. Then, after the compressor responds to the frequency adjustment instruction, the first obtaining unit obtains the current liquid level of the liquid storage tank, wherein the liquid storage tank is used to store the refrigerant. And when the current liquid level reaches the predetermined liquid level, the second sending unit sends a start instruction to the fluorine pump, wherein the start instruction is used to instruct the fluorine pump to enter the operating mode. Thus, only when the operating speed of the compressor is reduced to the predetermined liquid level of the liquid storage tank, the fluorine pump is triggered to start, thereby improving the stability of the air conditioner during the refrigeration mode switching and improving the reliability of the air conditioner.

[0066] It can be easily noted that, since when the double-cycle refrigeration system of the air conditioner needs to be switched from the refrigeration mode driven by the compressor to the refrigeration mode driven by the fluorine pump, the operating speed of the compressor is first controlled to be reduced to the predetermined liquid level of the refrigerant in the liquid storage tank, and then the fluorine pump is triggered to start, thereby effectively avoiding the cavitation or no-load of the fluorine pump during the operating mode switching, which affects the service life of the fluorine pump, and improving the stability and reliability of the air conditioning unit during the operating mode switching.

[0067] Therefore, by the technical scheme provided in Embodiment 2, the technical problem that the cavitation or no-load of the fluorine pump is easily caused during the switching process from the compressor operation to the fluorine pump operation in the double-cycle refrigeration system in which the fluorine pump and the compressor are connected in series, and the stability of the air conditioner is reduced, is solved.

[0068] In an optional embodiment, the first sending unit comprises: a first obtaining module, configured to obtain the current outdoor temperature; and a first determining module, configured to determine that the refrigeration mode needs to be switched from the first refrigeration mode to the second refrigeration mode when the current outdoor temperature is lower than the preset temperature.

[0069] In an optional embodiment, the control device of the double-cycle refrigeration system further comprises: a third sending unit, configured to send an opening degree adjustment instruction to the throttling component at the same time as the frequency adjustment instruction is sent to the compressor, wherein the opening degree adjustment instruction is used to instruct to reduce the opening degree of the throttling component, and the throttling component is used to adjust the flow rate of the refrigerant flowing out of the liquid storage tank.

[0070] In an alternative embodiment, the control device of the dual-cycle refrigeration system further comprises a first triggering unit configured to trigger the first one-way valve on the first bypass loop to close when sending the start instruction to the fluorine pump, so as to turn on the refrigeration loop in the second refrigeration mode, wherein the first bypass loop is in parallel with the fluorine pump.

[0071] In an alternative embodiment, the control device of the dual-cycle refrigeration system further comprises a second triggering unit configured to trigger the second one-way valve on the second bypass loop to open and the compressor to close when determining that the fluorine pump has responded to the start instruction for a predetermined time length, so as to turn off the refrigeration loop in the first refrigeration mode, wherein the second bypass loop is in parallel with the compressor.

[0072] In an alternative embodiment, the control device of the dual-cycle refrigeration system further comprises a second acquisition unit configured to acquire indoor temperature change information during the switching of the refrigeration mode from the first refrigeration mode to the second refrigeration mode; and an adjustment unit configured to adjust the opening degree of the throttling component based on the indoor temperature change information.

[0073] Embodiment 3

[0074] According to another aspect of the embodiments of the present application, there is also provided a dual-cycle refrigeration system using the control method of the dual-cycle refrigeration system according to any one of the above embodiments.

[0075] wherein, Figure 4 is a schematic diagram of the dual-cycle refrigeration system according to the embodiments of the present application, as Figure 4 shown, the dual-cycle refrigeration system comprises a fluorine pump, a compressor, a throttling device, an evaporator, a one-way valve 1, a one-way valve 2, a condenser, and a liquid storage tank. It should be noted that a liquid level detection component is arranged in the liquid storage tank for detecting the liquid level of the refrigerant in the liquid storage tank. When the air conditioner is in the fluorine pump refrigeration mode, the circuit of the dual-cycle refrigeration system is: fluorine pump-throttling device-evaporator-one-way valve 2-condenser-liquid storage tank-fluorine pump; when the air conditioner is in the compressor refrigeration mode, the circuit of the dual-cycle refrigeration system is: compressor-condenser-liquid storage tank-one-way valve 1-throttling device-evaporator-compressor.

[0076] From the above, in the embodiment of the present application, in the double-circulation refrigeration system, the refrigerant condenses into liquid in the condenser and enters the liquid storage tank under the driving of the system pressure. The liquid storage tank is provided with a liquid level detection component, which can reflect the liquid level of the refrigerant in the liquid storage tank in real time. The inlet of the fluorine pump is connected with the outlet of the liquid storage tank. The fluorine pump is provided with a bypass circuit, and the bypass circuit is provided with a one-way valve 1. When the fluorine pump is not started, the refrigerant completes the circulation through the bypass circuit. The outlet of the fluorine pump is connected with the inlet of the throttling device. The throttling device is connected with the evaporator, the compressor (provided with a bypass circuit and a one-way valve 2, and the refrigerant completes the circulation through the bypass circuit when the compressor is stopped), the condenser and the liquid storage tank in sequence through pipelines. The fluorine pump, the one-way valve of the fluorine pump, the compressor, the one-way valve of the compressor, the throttling device and the liquid level detection component of the liquid storage tank are connected with the control module.

[0077] When the compressor operation mode needs to be switched to the fluorine pump operation mode, the control center of the double-circulation refrigeration system reduces the operation frequency of the compressor and reduces the opening degree of the throttling device. After the compressor reduces the frequency, the required refrigerant in the system circuit will be reduced, and the liquid refrigerant in the condenser will enter the liquid storage tank under the action of the system pressure. Due to the reduction of the opening degree of the throttling device, the refrigerant from the liquid storage tank will be reduced. At this time, the liquid level of the liquid storage tank will rise. When the control module detects that the liquid level of the liquid storage tank rises to the second preset value, the control module controls the fluorine pump to start and closes the one-way valve 1 of the bypass circuit of the fluorine pump. At this time, the fluorine pump and the compressor operate simultaneously. When the fluorine pump is completely started, the control module controls the one-way valve 2 of the bypass circuit of the compressor to open and controls the compressor to close. According to the change of the temperature in the machine room, the opening degree of the throttling device is adjusted to complete the mode switching. In the whole mode switching process, the system pressure will not change too much, avoiding the phenomenon that the refrigerant in the liquid storage tank flashes due to the sudden reduction of the system pressure, thereby causing the cavitation of the inlet of the fluorine pump. At the same time, the temperature in the machine room will not change too much, which ensures that the unit stably switches the mode.

[0078] Through the technical scheme provided by the embodiment 3 of the present application, without increasing the connecting components, only by logically controlling the double-circulation refrigeration system (controlling by the logic mode, gradually adjusting each system component, which can make the air conditioner operation mode stably and reliably switch), the stable switching of the compressor operation mode to the fluorine pump operation mode can be realized. That is, by adjusting the operation state of the compressor and the throttling device, the liquid level of the liquid storage tank is adjusted, the fluorine pump is normally started and operated, the phenomenon that the refrigerant in the liquid storage tank flashes due to the reduction of the system pressure of the refrigeration cycle system is effectively avoided, the cavitation or no-load of the fluorine pump when the compressor operation mode switches to the fluorine pump operation mode is effectively avoided, the stability and reliability of the air conditioning unit when the operation mode switches are improved, and the influence on the service life of the fluorine pump is effectively reduced.

[0079] Embodiment 4

[0080] According to another aspect of the present invention, an electrical device is also provided, which includes the dual-cycle refrigeration system described above.

[0081] in, Figure 5 This is a schematic diagram of an electrical device according to an embodiment of the present invention, such as... Figure 5 As shown, the electrical equipment includes the dual-cycle refrigeration system described in Embodiment 4 above. The structure of the dual-cycle refrigeration system is as described in Embodiment 4 above. Figure 4 As shown. It should be noted that the structure of this dual-cycle refrigeration system can also include more than [a certain number of components]. Figure 4 The components shown can be replaced with other alternative components.

[0082] The aforementioned electrical appliances may include, but are not limited to, air conditioners, refrigerators, etc.

[0083] Example 5

[0084] According to another aspect of the present invention, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein the program executes the control method of the dual-cycle refrigeration system described above.

[0085] Optionally, in this embodiment, the computer-readable storage medium may be located in any computer terminal in a group of computer terminals in a computer network, or in any communication device in a group of communication devices.

[0086] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: when it is determined that the cooling mode needs to be switched from a first cooling mode to a second cooling mode, a frequency adjustment command is sent to the compressor, wherein the first cooling mode is a cooling mode driven by the compressor, the second cooling mode is a cooling mode driven by the refrigerant pump, and the frequency adjustment command is used to instruct the compressor to reduce its operating frequency; after the compressor responds to the frequency adjustment command, the current liquid level of the receiver tank is obtained, wherein the receiver tank is used to store refrigerant; when the current liquid level reaches a predetermined liquid level, a start command is sent to the refrigerant pump, wherein the start command is used to instruct the refrigerant pump to enter the operating mode.

[0087] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: obtaining the current outdoor temperature; and determining that it is necessary to switch from the first cooling mode to the second cooling mode when the current outdoor temperature is lower than a preset temperature.

[0088] Optionally, in the embodiment, the computer readable storage medium is configured to store program code for performing the following step: sending an opening degree adjustment instruction to the throttling component while sending the frequency adjustment instruction to the compressor, wherein the opening degree adjustment instruction is used to instruct to reduce the opening degree of the throttling component, and the throttling component is used to adjust the flow rate of the refrigerant flowing out of the liquid accumulator.

[0089] Optionally, in the embodiment, the computer readable storage medium is configured to store program code for performing the following step: triggering the first one-way valve on the first bypass circuit to close to turn on the refrigeration circuit in the second refrigeration mode when the start instruction is sent to the fluorine pump, wherein the first bypass circuit is connected in parallel with the fluorine pump.

[0090] Optionally, in the embodiment, the computer readable storage medium is configured to store program code for performing the following step: triggering the second one-way valve on the second bypass circuit to open and closing the compressor to close the refrigeration circuit in the first refrigeration mode after determining that the fluorine pump responds to the start instruction for a predetermined duration, wherein the second bypass circuit is connected in parallel with the compressor.

[0091] Optionally, in the embodiment, the computer readable storage medium is configured to store program code for performing the following step: obtaining indoor temperature change information during the refrigeration mode is switched from the first refrigeration mode to the second refrigeration mode; and adjusting the opening degree of the throttling component based on the indoor temperature change information.

[0092] Embodiment 6

[0093] According to another aspect of the embodiments of the present application, a processor is also provided, and the processor is used to run a program, wherein the program performs the control method of the double-circulation refrigeration system according to any one of the above embodiments when the program is running.

[0094] The above-mentioned serial numbers of the embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0095] In the above-mentioned embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0096] In several embodiments provided in the present application, it should be understood that the disclosed technology can be implemented by other means. Among them, the above-mentioned device embodiments are only schematic, for example, the division of the units can be a logical function division, and actual implementation can have another division mode, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed units can be indirect coupling or communication connection through some interfaces, units or modules, which can be electrical or other forms.

[0097] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, i.e. they can be located in one place or distributed to multiple units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0098] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0099] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the part of the prior art or the whole or part of the technical solutions can be embodied in the form of a software product, which is stored in a storage medium and includes a plurality of instructions for making a computer device (which can be a personal computer, a server or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application. The foregoing storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and various program code storage media.

[0100] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A control method for a dual cycle refrigeration system, characterized by, The method comprises the following steps: sending a frequency adjustment instruction to the compressor when it is determined that the refrigeration mode needs to be switched from a first refrigeration mode to a second refrigeration mode, wherein the first refrigeration mode is a refrigeration mode driven by the compressor, the second refrigeration mode is a refrigeration mode driven by a fluorine pump, and the frequency adjustment instruction is used to instruct the compressor to reduce the operating frequency; after the compressor responds to the frequency adjustment instruction, obtaining the current liquid level of a liquid storage tank, wherein the liquid storage tank is used to store refrigerant; when the current liquid level reaches a predetermined liquid level, sending a start instruction to the fluorine pump, wherein the start instruction is used to instruct the fluorine pump to enter an operating mode, at the same time as sending the frequency adjustment instruction to the compressor, sending an opening degree adjustment instruction to a throttling component, wherein the opening degree adjustment instruction is used to instruct to reduce the opening degree of the throttling component, and the throttling component is used to adjust the flow rate of the refrigerant flowing out of the liquid storage tank.

2. The control method of a dual cycle refrigeration system according to claim 1, characterized by, The method comprises the following steps: obtaining the current outdoor temperature; when the current outdoor temperature is lower than a preset temperature, determining that the refrigeration mode needs to be switched from the first refrigeration mode to the second refrigeration mode.

3. The control method of a dual cycle refrigeration system according to claim 1, characterized by, The method further comprises the following steps: when the start instruction is sent to the fluorine pump, triggering a first one-way valve on a first bypass circuit to close, so as to turn on the refrigeration circuit in the second refrigeration mode, wherein the first bypass circuit is connected in parallel with the fluorine pump.

4. The control method of a dual cycle refrigeration system according to claim 1, characterized by, The method further comprises the following steps: after determining that the fluorine pump responds to the start instruction for a predetermined length of time, triggering a second one-way valve on a second bypass circuit to open and close the compressor, so as to close the refrigeration circuit in the first refrigeration mode, wherein the second bypass circuit is connected in parallel with the compressor.

5. The control method of a dual cycle refrigeration system according to any one of claims 1 to 4, characterized by, The method further comprises the following steps: during the switching of the refrigeration mode from the first refrigeration mode to the second refrigeration mode, obtaining indoor temperature change information; adjusting the opening degree of the throttling component based on the indoor temperature change information.

6. A control apparatus for a dual cycle refrigeration system, characterized by The method comprises the following steps: a first sending unit is configured to send a frequency adjustment instruction to the compressor when it is determined that the refrigeration mode needs to be switched from a first refrigeration mode to a second refrigeration mode, wherein the first refrigeration mode is a refrigeration mode driven by the compressor, the second refrigeration mode is a refrigeration mode driven by a fluorine pump, and the frequency adjustment instruction is used to instruct the compressor to reduce the operating frequency; a first obtaining unit is configured to obtain the current liquid level of a liquid storage tank after the compressor responds to the frequency adjustment instruction, wherein the liquid storage tank is used to store refrigerant; a second sending unit is configured to send a start instruction to the fluorine pump when the current liquid level reaches a predetermined liquid level, wherein the start instruction is used to instruct the fluorine pump to enter an operating mode, a third sending unit is configured to send an opening degree adjustment instruction to a throttling component at the same time as sending the frequency adjustment instruction to the compressor, wherein the opening degree adjustment instruction is used to instruct to reduce the opening degree of the throttling component, and the throttling component is used to adjust the flow rate of the refrigerant flowing out of the liquid storage tank.

7. A dual cycle refrigeration system characterized by, The double-cycle refrigeration system uses the control method of the double-cycle refrigeration system according to any one of claims 1 to 5.

8. An electrical appliance, characterized in that The electric appliance device comprises the double-circulation refrigeration system of claim 7.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium comprises a stored program, wherein the program performs the control method of the double-circulation refrigeration system of any one of claims 1 to 5.

10. A processor, comprising: The processor is configured to run a program, wherein the program performs the control method of the double-circulation refrigeration system of any one of claims 1 to 5 when running.

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