Air conditioner and control method and device thereof

Abstract

The invention provides an air conditioner and a control method and device thereof. The air conditioner comprises a main refrigerant loop and a main power module, the main power module comprises a main compressor, an outdoor heat exchanger and an indoor heat exchanger which are connected through a main refrigerant pipeline, and the main power module is used for conducting driving frequency conversion on the main compressor; the secondary refrigerant loop comprises a secondary compressor, a condenser and an evaporator which are connected through a secondary refrigerant pipeline, and the evaporator is in heat transfer connection with the main power module; the water heat exchange loop comprises a return air heat exchanger, a water storage tank and a water pump which are connected through a water pipeline, and the water pipeline flows through the condenser; an air suction port of the main compressor is connected with an air suction pipe part of a main refrigerant pipeline, and the air suction pipe part flows through the return air heat exchanger. The problems that in the prior art, a refrigerant loop is high in power module temperature, low in exhaust temperature and the like are solved, waste heat resources in the system are fully utilized, the energy utilization efficiency is improved, and the stability of the system and the user experience are enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical appliances, and in particular to an air conditioner, its control method and control device. Background Art

[0002] At present, most air conditioners, especially large air conditioners, basically use variable-frequency compressors. The variable-frequency compressor requires a variable-frequency power module to drive the frequency conversion, and the actual power module will generate a relatively high temperature. At present, most of them are in close contact with the refrigerant radiator and the power module, and the refrigerant inside the system itself flows through the refrigerant radiator to reduce the temperature of the power module, prevent the power module from operating at high temperature, thereby improving the service life of the power module and reducing the defective rate of the power module. In addition, if the temperature of the power module is too high, it will cause the compressor to automatically reduce the frequency, seriously affecting the refrigeration and heating effects.

[0003] The air conditioner unit is prone to the situation of low exhaust temperature, especially during ultra-low temperature startup or during the frequency increase stage after heating defrosting or oil return completion. The low exhaust temperature will cause the compressor oil to condense in advance and enter the system with the refrigerant, and it cannot return oil through the oil separator. Even most of the oil return is refrigerant and less oil, resulting in the problem of lack of oil in the compressor. Summary of the Invention

[0004] The present invention provides an air conditioner, its control method and control device to solve the defects existing in the prior art and achieve the following technical effects: It not only solves the problems of high temperature of the power module and low exhaust temperature in the refrigerant circuit of the prior art, but also makes full use of the waste heat resources inside the system, improves the energy utilization efficiency, and enhances the stability of the system and the user experience.

[0005] The air conditioner according to the first aspect embodiment of the present invention includes: A main refrigerant circuit and a main power module, including a main compressor, an outdoor heat exchanger and an indoor heat exchanger connected by a main refrigerant pipeline, and the main power module is used to drive the frequency conversion of the main compressor; A secondary refrigerant circuit, including a secondary compressor, a condenser and an evaporator connected by a secondary refrigerant pipeline, wherein the evaporator is heat-transfer connected to the main power module; A water heat exchange circuit, including a gas return heat exchanger, a water storage tank and a water pump connected by a water pipeline, and the water pipeline flows through the condenser; an intake pipe portion of the main refrigerant pipeline is connected to the intake port of the main compressor, and the intake pipe portion flows through the gas return heat exchanger.

[0006] According to an embodiment of the present invention, the condenser is a heat exchange water tank, the water inlet and outlet of the heat exchange water tank are respectively communicated with the gas return heat exchanger and the water storage tank, and a balance pipeline is also connected between the heat exchange water tank and the water storage tank; The heat exchange water tank is provided with a water replenishing port, which is connected to the outside through a water replenishing pipe, and a water replenishing valve is arranged on the water replenishing pipe; and an electromagnetic valve is arranged between the water outlet of the heat exchange water tank and the water storage tank, and an electric heating device is arranged in the water storage tank.

[0007] According to a control method of an air conditioner according to the second aspect embodiment of the present invention based on the first aspect embodiment of the present invention, it includes: Obtain the temperature of the main power module; According to the temperature of the main power module, control and adjust the working parameters of the main refrigerant circuit and / or the secondary refrigerant circuit.

[0008] According to an embodiment of the present invention, the step of controlling and adjusting the working parameters of the main refrigerant circuit and / or the secondary refrigerant circuit according to the temperature of the main power module specifically includes: According to the temperature of the main power module, control the start or stop of the secondary compressor; Wherein, if the temperature of the main power module is greater than or equal to a preset temperature upper limit, control the secondary compressor to start; or, if the temperature of the main power module is less than or equal to a preset temperature lower limit, control the secondary compressor to stop; or, if the temperature of the main power module is greater than or equal to the maximum allowable temperature, control the secondary compressor to stop.

[0009] According to an embodiment of the present invention, the step of controlling and adjusting the working parameters of the main refrigerant circuit and / or the secondary refrigerant circuit according to the temperature of the main power module specifically includes: When the secondary compressor is started, determine the target evaporation temperature of the secondary refrigerant circuit according to the range of the temperature of the main power module; According to the target evaporation temperature, control and adjust the working frequency of the secondary compressor until the actual evaporation temperature of the secondary refrigerant circuit reaches the target evaporation temperature; Wherein, the step of determining the target evaporation temperature of the secondary refrigerant circuit according to the range of the temperature of the main power module specifically includes: When the temperature of the main power module is greater than or equal to a first set temperature, determine the target evaporation temperature as a first evaporation temperature; When the temperature of the main power module is greater than or equal to a second set temperature and less than a third set temperature, determine the target evaporation temperature as a second evaporation temperature; When the temperature of the main power module is greater than or equal to a third set temperature and less than a fourth set temperature, determine the target evaporation temperature as a third evaporation temperature; When the temperature of the main power module is greater than or equal to the fourth set temperature, determine the target evaporation temperature as the fourth evaporation temperature, and at this time, the secondary compressor operates at the set maximum frequency. Wherein, the second set temperature is greater than the first set temperature, the first evaporation temperature is less than the second evaporation temperature, the second evaporation temperature is less than the third evaporation temperature, and the third evaporation temperature is less than the fourth evaporation temperature.

[0010] According to an embodiment of the present invention, in the step of controlling and adjusting the operating frequency of the secondary compressor according to the target evaporation temperature until the actual evaporation temperature of the secondary refrigerant circuit reaches the target evaporation temperature when the secondary compressor is turned on: When the target evaporation temperature is the first evaporation temperature, control the operating frequency of the secondary compressor not to exceed the set maximum frequency of the first percentage; When the target evaporation temperature is the second evaporation temperature, control the operating frequency of the secondary compressor not to exceed the set maximum frequency of the second percentage; When the target evaporation temperature is the third evaporation temperature, control the operating frequency of the secondary compressor not to exceed the set maximum frequency of the third percentage; Wherein, the first percentage is less than the second percentage, and the second percentage is less than the third percentage.

[0011] According to an embodiment of the present invention, the step of controlling and adjusting the operating parameters of the main refrigerant circuit and / or the secondary refrigerant circuit according to the temperature of the main power module specifically includes: When the temperature of the main power module is greater than the fifth set temperature and less than or equal to the sixth set temperature, control the main compressor to reduce the frequency to the set maximum frequency of the fourth percentage; When the temperature of the main power module is greater than the sixth set temperature and less than or equal to the seventh set temperature, control the main compressor to reduce the frequency to the set maximum frequency of the fifth percentage; When the temperature of the main power module is greater than the seventh set temperature and less than or equal to the eighth set temperature, control the main compressor to reduce the frequency to the set maximum frequency of the sixth percentage; When the temperature of the main power module is greater than the eighth set temperature, control both the main compressor and the secondary compressor to stop; Wherein, the fourth percentage is greater than the fifth percentage, and the fifth percentage is greater than the sixth percentage.

[0012] According to an embodiment of the present invention, the control method of the air conditioner further includes: Determine that the water pump start condition is met, and then start the water pump; Obtain the temperature difference of the refrigerant at the inlet and outlet of the suction gas heat exchanger, and control and adjust the rotational speed of the water pump according to the temperature difference of the refrigerant at the inlet and outlet; Among them, the step of controlling and adjusting the rotational speed of the water pump according to the temperature difference of the refrigerant at the inlet and outlet specifically includes: When the temperature difference of the refrigerant at the inlet and outlet is greater than or equal to the first temperature difference, control the water pump to adjust to the first rotational speed; When the temperature difference of the refrigerant at the inlet and outlet is less than the first temperature difference and greater than or equal to the second temperature difference, control the water pump to adjust to the second rotational speed; When the temperature difference of the refrigerant at the inlet and outlet is less than the second temperature difference and greater than or equal to the third temperature difference, control the water pump to adjust to the third rotational speed; When the temperature difference of the refrigerant at the inlet and outlet is less than the third temperature difference and greater than or equal to the fourth temperature difference, control the water pump to adjust to the fourth rotational speed; When the temperature difference of the refrigerant at the inlet and outlet is less than or equal to the fourth temperature difference, control the water pump to adjust to the maximum rotational speed; And the first rotational speed is less than the second rotational speed, the second rotational speed is less than the third rotational speed, and the third rotational speed is less than the fourth rotational speed.

[0013] According to an embodiment of the present invention, the control method of the air conditioner further includes: Obtain the liquid level in the heat exchange water tank, and control the opening and closing of the water replenishing valve according to the liquid level in the heat exchange water tank; And / or, obtain the water temperature in the heat exchange water tank and the liquid level in the storage water tank, and control and adjust the opening degree of the solenoid valve according to the water temperature in the heat exchange water tank and the liquid level in the storage water tank; And / or, obtain the water temperature and liquid level in the storage water tank, and control and adjust the working state of the electric heating device according to the water temperature and liquid level in the storage water tank.

[0014] According to the control device of the air conditioner according to the third aspect embodiment of the present invention based on the air conditioner according to the first aspect embodiment of the present invention, includes: An acquisition module, configured to acquire the temperature of the main power module; A control module, configured to control and adjust the working parameters of the main refrigerant circuit and / or the secondary refrigerant circuit according to the temperature of the main power module.

[0015] The air conditioner according to the embodiment of the present invention has at least the following advantages compared with the related art.

[0016] (1)Comprehensive utilization of heat: The air conditioner of the present invention absorbs the waste heat of the main power module through the evaporator of the secondary refrigerant circuit, which not only reduces the temperature of the main power module and avoids the problem of compressor frequency reduction caused by overheating of the power module, but also utilizes this part of waste heat to generate hot water, realizing the reuse of waste heat and improving the energy utilization efficiency.

[0017] (2)Improve the problem of low exhaust temperature: The traditional refrigerant circuit may have the problem of low exhaust temperature after ultra-low temperature startup, heating defrosting or oil return, which will cause oil shortage in the compressor. The present invention uses the hot water circulation to exchange heat between the hot water and the low-temperature and low-pressure refrigerant at the suction port of the main compressor, increasing the temperature of the refrigerant, thus solving the problem of low exhaust temperature and ensuring the normal operation of the compressor.

[0018] (3)Improve the stability of the system: By controlling the start and stop of the secondary compressor and adjusting the working parameters of the secondary refrigerant circuit according to the temperature of the main power module, the system can be dynamically adjusted according to actual needs, thus avoiding the phenomenon that the compressor starts and stops frequently due to temperature fluctuations, and improving the stability and reliability of the system.

[0019] (4)Optimize the user experience: The present invention accurately adjusts the target evaporation temperature by controlling the working frequency of the secondary compressor, enabling the system to maintain good performance under different conditions, reducing the fluctuation of the indoor temperature, and improving the comfort of the user.

[0020] In summary, the present invention not only solves the problems such as high temperature of the power module and low exhaust temperature existing in the prior art refrigerant circuit, but also makes full use of the waste heat resources inside the system, improves the energy utilization efficiency, and enhances the stability of the system and the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic structural diagram of the air conditioner provided by the present invention.

[0023] Figure 2 It is a schematic structural diagram of the evaporator provided by the present invention.

[0024] Figure 3 It is one of the step schematic diagrams of the control method of the air conditioner provided by the present invention.

[0025] Figure 4It is the second step schematic diagram of the control method of the air conditioner provided by the present invention.

[0026] Figure 5 It is the structural schematic diagram of the control device of the air conditioner provided by the present invention.

[0027] Figure 6 It is the structural schematic diagram of the electronic device provided by the present invention. Description of the drawings: 1. Main refrigerant circuit; 11. Main compressor; 12. Outdoor heat exchanger; 13. Indoor heat exchanger; 14. Four-way valve; 2. Main power module; 3. Secondary refrigerant circuit; 31. Secondary compressor; 32. Heat exchange water tank; 33. Evaporator; 34. Throttling device; 4. Water heat exchange circuit; 41. Water storage tank; 42. Water pump; 43. Return gas heat exchanger; 44. Balance pipeline; 45. Make-up water pipeline; 46. Make-up water valve; 47. Solenoid valve; 48. Electric heating device. Detailed implementation manners

[0029] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean 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 embodiments of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0030] Next, a kind of air conditioner, the control method and control device of the air conditioner given by the present invention will be described with reference to the drawings. It should be noted that the control method and control device of the present invention are implemented based on the structure of the air conditioner.

[0031] As Figure 1 and Figure 2 shown, the air conditioner according to the first aspect embodiment of the present invention includes a main refrigerant circuit 1, a main power module 2, a secondary refrigerant circuit 3 and a water heat exchange circuit 4.

[0032] The main refrigerant circuit 1 includes a main compressor 11, an outdoor heat exchanger 12 and an indoor heat exchanger 13 connected through a main refrigerant pipeline, and the main power module 2 is used to drive the main compressor 11 in a variable frequency manner.

[0033] The secondary refrigerant circuit 3 includes a secondary compressor 31, a condenser and an evaporator 33 connected through a secondary refrigerant pipeline, wherein the evaporator 33 is heat transfer connected to the main power module 2.

[0034] The water heat exchange circuit 4 includes a suction gas heat exchanger 43, a water storage tank 41, and a water pump 42 connected by water pipes, and the water pipes flow through the condenser; an intake port of the main compressor 11 is connected to the suction pipe portion of the main refrigerant pipe, and the suction pipe portion flows through the suction gas heat exchanger 43.

[0035] According to the embodiment of the present invention, the design of the air conditioner adopts three main parts: a main refrigerant circuit 1, a secondary refrigerant circuit 3, and a water heat exchange circuit 4. The structures, connection relationships, and uses of each circuit will be introduced in detail below, and the working process and working principle of the entire air conditioner will be comprehensively described.

[0036] Among them, the main refrigerant circuit 1 is the core refrigeration or heating part of the air conditioner. It includes a main compressor 11, an outdoor heat exchanger 12 (usually a condenser), and an indoor heat exchanger 13 (usually an evaporator 33) connected by a main refrigerant pipe. The main compressor 11 is driven by a main power module 2 in a variable frequency manner, and the operating frequency is adjusted as needed to control the pressure and flow rate of the refrigerant. The outdoor heat exchanger 12 is responsible for condensing the high-temperature and high-pressure refrigerant vapor into a liquid and releasing heat to the outside; the indoor heat exchanger 13 is responsible for evaporating the low-temperature and low-pressure refrigerant liquid into a gas and absorbing heat from the indoor, achieving the refrigeration or heating effect.

[0037] The secondary refrigerant circuit 3 is an auxiliary part of the air conditioner. It includes a secondary compressor 31, a condenser, and an evaporator 33 connected by a secondary refrigerant pipe. The evaporator 33 of the secondary refrigerant circuit 3 is heat-transfer connected to the main power module 2 of the main refrigerant circuit 1, so that the evaporator 33 of the secondary refrigerant circuit 3 can absorb the heat of the main power module 2, thereby reducing the temperature of the main power module 2. The condenser of the secondary refrigerant circuit 3 is responsible for condensing the refrigerant vapor that has absorbed heat from the main power module 2 into a liquid and releasing the heat to the water system for heating hot water.

[0038] The water heat exchange circuit 4 is responsible for the production and distribution of hot water. It includes a suction gas heat exchanger 43, a water storage tank 41, and a water pump 42 connected by water pipes. The water pipes flow through the condenser of the secondary refrigerant circuit 3, obtain heat from here to heat the water, and form hot water. The suction gas heat exchanger 43 is installed at the intake port of the main compressor 11 and is connected to the suction pipe portion of the main refrigerant pipe. Through the suction gas heat exchanger 43, the hot water exchanges heat with the low-temperature and low-pressure refrigerant, increasing the temperature of the refrigerant, and further increasing the exhaust temperature of the main compressor 11, preventing the problem of oil shortage caused by low exhaust temperature.

[0039] Furthermore, the specific working process and working principle of the air conditioner of the present invention are as follows.

[0040] When the air conditioner starts, the main refrigerant circuit 1 begins to operate. The main compressor 11 starts to compress the refrigerant through variable-frequency drive, turning it into high-temperature and high-pressure steam, and releasing heat through the outdoor heat exchanger 12. The refrigerant then becomes low-temperature and low-pressure liquid, absorbs the heat in the room through the indoor heat exchanger 13 and evaporates into gas, and then returns to the main compressor 11.

[0041] During this period, if the temperature of the main power module 2 rises, the secondary refrigerant circuit 3 starts. The secondary compressor 31 operates, and the low-temperature and low-pressure refrigerant liquid absorbs the heat of the main power module 2 in the evaporator 33 and turns into steam, and then releases heat to the water circuit system through the condenser to form hot water.

[0042] At the same time, the water circuit system passes through the suction gas heat exchanger 43 and exchanges heat between the hot water and the low-temperature and low-pressure refrigerant at the suction port of the main compressor 11 to increase the temperature of the refrigerant, ensure that the exhaust temperature of the main compressor 11 is within a reasonable range, and prevent oil shortage.

[0043] The hot water in the water circuit system is stored in the water storage tank 41. When hot water is needed, the water pump 42 transports the hot water to the place of use.

[0044] The air conditioner according to the embodiment of the present invention has at least the following advantages compared with the related art.

[0045] (1) Comprehensive utilization of heat: The air conditioner of the present invention absorbs the waste heat of the main power module 2 through the evaporator 33 of the secondary refrigerant circuit 3, which not only reduces the temperature of the main power module 2 and avoids the problem of compressor frequency reduction caused by overheating of the power module, but also uses this part of waste heat to generate hot water, realizing the reuse of waste heat and improving the energy utilization efficiency.

[0046] (2) Improvement of the problem of low exhaust temperature: The traditional refrigerant circuit may have the problem of low exhaust temperature during ultra-low temperature startup, heating defrosting or oil return, which will cause oil shortage in the compressor. The present invention improves the temperature of the refrigerant by circulating hot water and exchanging heat between the hot water and the low-temperature and low-pressure refrigerant at the suction port of the main compressor 11, thus solving the problem of low exhaust temperature and ensuring the normal operation of the compressor.

[0047] (3) Improvement of system stability: By controlling the start and stop of the secondary compressor 31 and adjusting the working parameters of the secondary refrigerant circuit 3 according to the temperature of the main power module 2, the system can be dynamically adjusted according to actual needs, thus avoiding the phenomenon that the compressor starts and stops frequently due to temperature fluctuations, and improving the stability and reliability of the system.

[0048] (4) Optimization of user experience: The present invention accurately adjusts the target evaporation temperature by controlling the working frequency of the secondary compressor 31, so that the system can maintain good performance under different conditions, reduce the fluctuation of the indoor temperature, and improve the comfort of users.

[0049] In summary, the present invention not only solves the problems in the prior art such as high temperature of the power module and low exhaust temperature in the refrigerant circuit, but also makes full use of the waste heat resources inside the system, improves the energy utilization efficiency, and enhances the stability of the system and the user experience.

[0050] As Figure 1 shown, according to some embodiments of the present invention, the condenser is a water exchange tank 32. The water inlet and outlet of the water exchange tank 32 are respectively connected to the return air heat exchanger 43 and the water storage tank 41, and a balance pipe 44 is also connected between the water exchange tank 32 and the water storage tank 41.

[0051] It can be understood that in certain embodiments of the present invention, the condenser is designed as the water exchange tank 32, which has a water inlet and a water outlet, and these two ports are respectively connected to the return air heat exchanger 43 and the water storage tank 41. Such a design enables the system to recover heat from the refrigerant for heating domestic water. Specifically, the high-temperature and high-pressure refrigerant vapor is cooled in the condenser (i.e., the water exchange tank 32) of the secondary refrigerant circuit 3, and the heat generated during the cooling process is absorbed by water, thereby heating the water in the water storage tank 41. This not only utilizes the heat that would otherwise be wasted but also provides hot water required for life. In addition, a balance pipe 44 is also provided between the water exchange tank 32 and the water storage tank 41. The function of this pipe is to prevent the pumping effect of the pump when the water pump 42 is working, that is, when the water pump 42 operates, it ensures that water can smoothly flow from the water storage tank 41 into the water exchange tank 32, thereby maintaining the stable operation of the system.

[0052] In this way, the above design not only improves the energy utilization efficiency, reduces energy waste, but also increases the versatility of the refrigerant circuit, making it not only limited to refrigeration or heating, but also capable of providing hot water for users, enhancing the economic benefits of the system and the user experience.

[0053] As Figure 1 shown, according to some embodiments of the present invention, a water replenishing port is provided on the water exchange tank 32. The water replenishing port is connected to the outside through a water replenishing pipe 45, and a water replenishing valve 46 is provided on the water replenishing pipe 45. And a solenoid valve 47 is provided between the water outlet of the water exchange tank 32 and the water storage tank 41, and an electric heating device 48 is provided in the water storage tank 41.

[0054] In this embodiment, the hot water exchange tank 32 is designed to have a water replenishment port. The water replenishment port is connected to an external water source through a water replenishment pipe 45, and a water replenishment valve 46 is installed on the water replenishment pipe 45. When the system detects that the water level in the hot water exchange tank 32 is lower than a certain predetermined value, the water replenishment valve 46 will be opened to replenish water into the hot water exchange tank 32. The starting condition of the water replenishment valve 46 is usually to monitor the water level through a liquid level sensor. When the water level is lower than 60% or when the refrigerant subcooling degree (the temperature of the refrigerant outlet pipe minus the saturation temperature corresponding to the high-pressure pressure) is less than or equal to 5°C, the water replenishment valve 46 starts.

[0055] An electromagnetic valve 47 is provided between the water outlet of the hot water exchange tank 32 and the water storage tank 41, which means that the water flowing out of the hot water exchange tank 32 needs to be controlled by the electromagnetic valve 47 to enter the water storage tank 41. The opening condition of the electromagnetic valve 47 is that the temperature of the hot water exchange tank 32 reaches 48°C or the liquid level of the water storage tank 41 is lower than 60%. This can ensure that hot water is only delivered when the water in the hot water tank is hot enough or the water storage tank 41 needs more hot water.

[0056] An electric heating device 48 is installed inside the water storage tank 41. When the water temperature in the water storage tank 41 is lower than 41°C and the liquid level of the water storage tank 41 is higher than 65%, the electric heating device 48 will start to heat the water to a suitable temperature for use. When the water temperature exceeds 44°C or the liquid level in the water storage tank 41 is lower than 10%, the electric heating device 48 will be turned off to prevent dry burning or overheating.

[0057] In this way, the above design ensures that users can obtain an appropriate hot water supply at any time, and through the automated water replenishment and heating mechanisms, the need for human intervention is reduced, improving the automation level and user experience of the system.

[0058] A specific embodiment of the air conditioner of the present invention will be described below with reference to the accompanying drawings.

[0059] As Figure 1 shown, the main refrigerant circuit 1 includes a main compressor 11, an outdoor heat exchanger 12, a throttling device 34, an indoor heat exchanger 13, and a gas return heat exchanger 43. A main power module 2 is also installed in the main refrigerant circuit 1. Of course, some components can be added based on these basic components to achieve certain functions. The main compressor 11 is driven by the main power module 2. The main power module 2 generates a large amount of heat. Overheating of the main power module 2 will cause the compressor to reduce its frequency, so it is necessary to cool the power module when its temperature is too high. Further, the main refrigerant circuit 1 can be a heat pump system, including a four-way valve 14 that can reverse for heating. Further, the main refrigerant circuit 1 can set double throttling elements for the outdoor heat exchanger 12 and the indoor heat exchanger 13 to ensure that the refrigerant flowing through the evaporator 33 is a medium-temperature and high-pressure refrigerant liquid. The main compressor 11 can be various forms of compressors, such as rotor, scroll, centrifugal, etc.

[0060] The outdoor heat exchanger 12 and the indoor heat exchanger 13 can be of the air-cooled or water-cooled type. The suction gas heat exchanger 43 is located on the suction gas pipe of the main compressor 11, and a main refrigerant pipe and a water pipe are respectively arranged to flow through the suction gas heat exchanger 43. The suction gas heat exchanger 43 can be a double-pipe heat exchanger or a plate heat exchanger. Hot water flows through one end flow path of the suction gas heat exchanger 43, and refrigerant flows through the other end flow path. The flow directions of the hot water and the refrigerant are always opposite (the purpose is to improve the heat exchange effect). The low-temperature and low-pressure refrigerant absorbs the temperature of the hot water, the temperature of the hot water decreases, and the temperature of the refrigerant increases, so as to achieve the purpose of increasing the discharge temperature. In this way, the increase in the discharge temperature can effectively solve the problem of oil shortage of the main compressor 11 caused by the low discharge temperature.

[0061] Further, a heat preservation cotton or a heat insulation device is arranged on the outer periphery of the suction gas heat exchanger 43 to prevent the heat dissipation of the hot water. Further, the flow path cross-sectional area of the water pipe in the suction gas heat exchanger 43 is larger than that of the suction gas pipe. In this way, due to the low suction gas temperature, the temperature difference between it and the hot water is large, and the heat exchange effect is better.

[0062] The secondary refrigerant circuit 3 includes a secondary compressor 31, a condenser, a throttling device 34 and a secondary evaporator 33. Of course, some components can be added on the basis of these basic components to achieve certain functions. The refrigeration capacity of the secondary refrigerant circuit 3 is smaller than that of the primary refrigerant circuit 1 and does not directly participate in the indoor cooling and heating effects. The evaporator 33 of the secondary refrigerant circuit 3 is directly connected to the main power module 2. The secondary compressor 31 can be a rotary compressor, a scroll compressor or a piston compressor. The condenser is a hot water exchange tank 32, and the high-temperature and high-pressure refrigerant vapor enters the hot water exchange tank 32 to heat the water. The hot water exchange tank 32 includes a housing, a liquid level gauge, a liquid level sensor, a temperature sensor, a water replenishing valve 46 and a solenoid valve 47. The water storage tank 41 includes a pressure relief valve, a housing, a liquid level gauge, a liquid level sensor, a temperature sensor and a drain valve.

[0063] The secondary refrigerant circuit 3 discharges the high-temperature and high-pressure refrigerant vapor into the hot water exchange tank 32. After being cooled by the water, the condensed refrigerant becomes a low-temperature and low-pressure refrigerant liquid through the throttling and pressure reduction of the electronic expansion valve and enters the evaporator 33 (i.e., the refrigerant radiator) to absorb the heat of the main power module 2 and becomes a low-temperature and low-pressure refrigerant vapor, and then returns to the secondary compressor 31.

[0064] Further, the secondary compressor 31 can be a scroll compressor, a rotary compressor, or a piston compressor. Further, the heat exchange water tank 32 can be a plate heat exchanger or a shell-and-tube heat exchanger, with refrigerant flowing through one end and water flowing through the other end. However, its ultimate purpose is to condense the refrigerant in the condenser. The evaporator 33 is a refrigerant radiator, and the material of the refrigerant radiator is a metal material, which can be aluminum or steel, aiming to conduct heat quickly. The refrigerant liquid with low temperature and low pressure flows inside the refrigerant radiator, absorbing the heat from the main power module 2. The cooperation mode between it and the main power module 2 is in the form of screw fastening or welding.

[0065] The pressure relief valve is located at the top of the heat exchange water tank 32, facilitating the ejection of pressurized gas. It is set to open when the pressure is ≥ 3Bar, and the pressure relief valve is normally closed. The water replenishing valve 46 is connected to the tap water pipe and is located at the top of the heat exchange water tank 32, and it is in an electric form. The liquid level sensor can detect the liquid level height of the heat exchange water tank 32. The temperature sensor is located inside the bottom of the heat exchange water tank 32, facilitating the detection of the water temperature at the bottom. The refrigerant pipeline inside the heat exchange water tank 32 is in a coil form. The water storage tank 41 has an electric heating device 48. When the temperature sensor of the water storage tank 41 detects that its water temperature is lower than 25°C, the solenoid valve 47 opens; when the water temperature is higher than 35°C, the solenoid valve 47 closes. The water tank level gauge can observe the actual water level in the water tank; the drain valve is a manual drain valve and can discharge hot water. Heat insulation cotton or a heat protection mechanism is provided around the heat exchange water tank 32 and the water storage tank 41.

[0066] The control method, control device, and air conditioner of the present invention will be described below with reference to the accompanying drawings. Among them, before elaborating on the embodiments of the present invention in detail, the entire application scenario will be described first. The control method, control device, electronic device, and computer-readable storage medium of the air conditioner in the embodiments of the present invention can be applied not only to the local air conditioner but also to the cloud platform in the Internet field, or the cloud platform in other types of Internet fields, or can also be applied to third-party devices. Among them, the third-party devices may include various different types such as mobile phones, tablets, laptops, in-vehicle computers, and other intelligent terminals.

[0067] Hereinafter, only the control method applicable to the air conditioner will be used as an example for illustration. It should be understood that the control method of the embodiments of the present invention can also be applicable to the cloud platform and third-party devices.

[0068] As Figure 3 shown, the control method of the air conditioner according to the second aspect embodiment of the present invention includes: Step S1, obtaining the temperature of the main power module 2; Step S2, controlling and adjusting the working parameters of the main refrigerant circuit 1 and / or the secondary refrigerant circuit 3 according to the temperature of the main power module 2.

[0069] First, the control system will monitor the temperature of the main power module 2 in real time. The acquisition of this data is crucial for subsequent control decisions. Through the built-in temperature sensor or other detection devices, the system can accurately measure and record the current temperature value of the main power module 2.

[0070] Once the temperature data of the main power module 2 is obtained, the control system will decide how to adjust the working states of the main refrigerant circuit 1 and the secondary refrigerant circuit 3 based on this temperature information. Specifically, when the temperature of the main power module 2 reaches or exceeds the preset temperature upper limit, the control system will turn on the secondary compressor 31 to help with heat dissipation. On the contrary, if the temperature drops to the preset temperature lower limit or below, the operation of the secondary compressor 31 will be stopped. If the temperature of the main power module 2 exceeds the maximum allowable temperature, the operation of the secondary compressor 31 will also be stopped to prevent overheating damage to the equipment. In addition, according to the temperature range of the main power module 2, the system will also adjust the target evaporation temperature of the secondary refrigerant circuit 3 and accordingly adjust the operating frequency of the secondary compressor 31 to ensure that the actual evaporation temperature of the secondary refrigerant circuit 3 reaches the required target evaporation temperature. In some cases, in order to further control the temperature, the system may also reduce the frequency of the main compressor 11 until the temperature of the main power module 2 returns to the safe range.

[0071] In summary, the control method of the present invention effectively manages the operating state of the system by monitoring the temperature of the main power module 2 in real time and taking corresponding measures according to different temperatures, ensuring both the efficient operation of the system and avoiding potential damage caused by too high or too low temperatures.

[0072] As Figure 4 shown, according to some embodiments of the present invention, the step of controlling and adjusting the working parameters of the main refrigerant circuit 1 and / or the secondary refrigerant circuit 3 according to the temperature of the main power module 2 specifically includes: Controlling the start or stop of the secondary compressor 31 according to the temperature of the main power module 2.

[0073] Among them, if the temperature of the main power module 2 is greater than or equal to the preset temperature upper limit, control the secondary compressor 31 to start; or, if the temperature of the main power module 2 is less than or equal to the preset temperature lower limit, control the secondary compressor 31 to stop; or, if the temperature of the main power module 2 is greater than or equal to the maximum allowable temperature, control the secondary compressor 31 to stop.

[0074] For example, the start condition of the secondary compressor 31 is: the temperature Tf of the main power module 2 ≥ 70 °C; the shutdown condition of the secondary compressor 31 is: the temperature Tf of the main power module 2 ≤ 43 °C; or, the temperature Tf of the main power module 2 ≥ 98 °C and lasts for 2 s (a final protection mechanism, at this time both the main compressor 11 and the secondary compressor 31 stop).

[0075] AsFigure 4 As shown, according to some embodiments of the present invention, the steps of controlling and adjusting the operating parameters of the main refrigerant circuit 1 and / or the secondary refrigerant circuit 3 according to the temperature of the main power module 2 specifically include: When the secondary compressor 31 is turned on, determine the target evaporation temperature of the secondary refrigerant circuit 3 according to the range of the temperature of the main power module 2; According to the target evaporation temperature, control and adjust the operating frequency of the secondary compressor 31 until the actual evaporation temperature of the secondary refrigerant circuit 3 reaches the target evaporation temperature.

[0076] It can be understood that the temperature of the main power module 2 is related to the refrigerant circulation volume and temperature difference of the secondary refrigerant circuit 3. The higher the refrigerant circulation volume of the secondary refrigerant circuit 3, the lower the temperature of the main power module 2; the lower the evaporation temperature of the secondary refrigerant circuit 3, that is, the greater the temperature difference between the refrigerant in the evaporator 33 of the secondary refrigerant circuit 3 and the main power module 2, the lower the temperature of the main power module 2.

[0077] In some specific embodiments of the present invention, the steps of determining the target evaporation temperature of the secondary refrigerant circuit 3 according to the range of the temperature of the main power module 2 specifically include: When the temperature of the main power module 2 is greater than or equal to the first set temperature, determine the target evaporation temperature as the first evaporation temperature; When the temperature of the main power module 2 is greater than or equal to the second set temperature and less than the third set temperature, determine the target evaporation temperature as the second evaporation temperature; When the temperature of the main power module 2 is greater than or equal to the third set temperature and less than the fourth set temperature, determine the target evaporation temperature as the third evaporation temperature; When the temperature of the main power module 2 is greater than or equal to the fourth set temperature, determine the target evaporation temperature as the fourth evaporation temperature. At this time, the secondary compressor 31 operates at the set maximum frequency.

[0078] Wherein, the second set temperature is greater than the first set temperature, the first evaporation temperature is less than the second evaporation temperature, the second evaporation temperature is less than the third evaporation temperature, and the third evaporation temperature is less than the fourth evaporation temperature.

[0079] Furthermore, when the secondary compressor 31 is turned on, in the step of controlling and adjusting the operating frequency of the secondary compressor 31 according to the target evaporation temperature until the actual evaporation temperature of the secondary refrigerant circuit 3 reaches the target evaporation temperature: When the target evaporation temperature is the first evaporation temperature, control the operating frequency of the secondary compressor 31 not to exceed the first percentage of the set maximum frequency; When the target evaporation temperature is the second evaporation temperature, control the operating frequency of the secondary compressor 31 not to exceed the second percentage of the set maximum frequency; When the target evaporation temperature is the third evaporation temperature, control the operating frequency of the secondary compressor 31 not to exceed the set maximum frequency of the third percentage; Among them, the first percentage is less than the second percentage, and the second percentage is less than the third percentage.

[0080] Specifically, the operating frequency f of the secondary compressor 31 in the secondary refrigerant circuit 3 operates according to the evaporation temperature Ts. If the target evaporation temperature cannot be reached, the secondary compressor 31 continuously increases its frequency; if the target evaporation temperature is reached, the frequency of the secondary compressor 31 tends to be stable; if the target evaporation temperature is exceeded, the secondary compressor 31 decreases its frequency. That is, the target evaporation temperature is set in advance. The higher the temperature of the main power module 2, the lower the target evaporation temperature, and the higher the frequency the secondary compressor 31 needs to increase to reach the target evaporation temperature. When the frequency of the secondary compressor 31 increases, the overall refrigerant circulation volume of the secondary refrigerant circuit 3 increases, and the heat exchange temperature between the evaporator 33 and the main power module 2 increases, so the refrigeration effect is better, that is, more heat is taken away from the main power module 2, and the temperature of the power module decreases. The target evaporation temperature can be set in advance according to the experimental results. Specifically, the target evaporation temperature is related to the temperature of the main power module 2.

[0081] For example, when the temperature Tf of the main power module 2 ≥ Tao (ambient temperature) + 10°C and Tf ≥ 50°C, the secondary refrigerant circuit 3 is turned on and operates. The target evaporation temperature Ts (taking R410a refrigerant as an example) is 4°C. Implement PID control. After the secondary compressor 31 starts, the highest operating frequency is 50% of the set maximum frequency to prevent the frequency of the secondary compressor 31 from fluctuating frequently. For every 1°C increase in Tf, the frequency of the secondary compressor 31 increases by 2 Hz.

[0082] When 75°C > Tf ≥ 60°C, the target evaporation temperature Ts (taking R410a refrigerant as an example) is 3°C. For every 1°C increase, the frequency of the secondary compressor 31 increases by 2 Hz, and the highest operating frequency of the secondary compressor 31 is 70% of the set maximum frequency.

[0083] When 90°C > Tf ≥ 75°C, the target evaporation temperature Ts (taking R410a refrigerant as an example) is 2°C. For every 1°C increase, the frequency of the secondary compressor 31 increases by 3 Hz, and the highest operating frequency of the secondary compressor 31 is 85% of the set maximum frequency.

[0084] When Tf ≥ 90°C, the target evaporation temperature Ts (taking R410a refrigerant as an example) is 1°C. The secondary compressor 31 operates at the set maximum frequency.

[0085] The above four situations all implement PID control. When the temperature of the main power module 2 stops rising and stabilizes, after stabilization, the frequency of the secondary compressor 31 is reduced at a speed of 1 rps for 10 seconds to prevent the secondary refrigerant circuit 3 from fluctuating frequently.

[0086] In addition, when the temperature of the power module in the main refrigerant circuit 1 drops to 43°C < Tf < 45°C, the secondary compressor 31 in the secondary refrigerant circuit 3 reduces to 10% of the set maximum frequency.

[0087] When the temperature of the power module in the main refrigerant circuit 1 drops to Tf < 43°C and Tf ≤ Tao + 5°C and lasts for 3 minutes, the secondary compressor 31 in the secondary refrigerant circuit 3 shuts down.

[0088] According to some embodiments of the present invention, the throttling device 34 in the secondary refrigerant circuit 3 can be controlled according to the superheat of the evaporator 33 (for a system with a low-pressure pressure sensor, the superheat can be calculated by the outlet temperature of the evaporator 33 - the saturation temperature corresponding to the low-pressure pressure), or the temperature difference between the inlet and outlet (for a system without a low-pressure pressure sensor, the superheat can be calculated by the outlet temperature of the evaporator 33 - the middle-section temperature of the evaporator 33). Under normal operating conditions, the superheat ≥ 0°C.

[0089] According to some embodiments of the present invention, the steps of controlling and adjusting the operating parameters of the main refrigerant circuit 1 and / or the secondary refrigerant circuit 3 according to the temperature of the main power module 2 specifically include: When the temperature of the main power module 2 is greater than the fifth set temperature and less than or equal to the sixth set temperature, control the main compressor 11 to reduce its frequency to the fourth percentage of the set maximum frequency; When the temperature of the main power module 2 is greater than the sixth set temperature and less than or equal to the seventh set temperature, control the main compressor 11 to reduce its frequency to the fifth percentage of the set maximum frequency; When the temperature of the main power module 2 is greater than the seventh set temperature and less than or equal to the eighth set temperature, control the main compressor 11 to reduce its frequency to the sixth percentage of the set maximum frequency; When the temperature of the main power module 2 is greater than the eighth set temperature, control both the main compressor 11 and the secondary compressor 31 to shut down.

[0090] Wherein, the fourth percentage is greater than the fifth percentage, and the fifth percentage is greater than the sixth percentage.

[0091] In this embodiment, the frequency of the main compressor 11 does not change with the temperature of the main power module 2. In this way, the operating frequency of the main compressor 11 is more stable, the system operation is more stable, and the indoor effect is better. If the temperature of the main power module 2 is high, then the evaporator 33 in the secondary refrigerant circuit 3 needs to solve the problem. However, if the temperature of the main power module 2 rises to the constraint value of 92°C or the protection value of 98°C due to reasons such as the cooling failure of the secondary refrigerant circuit 3 or the damage of the components in the secondary refrigerant circuit 3, the main compressor 11 should quickly reduce its frequency or shut down to protect the power module.

[0092] For example, when the temperature of the main power module 2 is greater than 92°C, the frequency of the main compressor 11 is reduced to 75% of the set maximum compressor frequency; if the temperature of the main power module 2 is greater than 94°C, the frequency of the main compressor 11 is reduced to 50% of the set maximum compressor frequency; if the temperature of the main power module 2 is greater than 96°C, the frequency of the main compressor 11 is reduced to 25% of the set maximum compressor frequency; if the temperature of the main power module 2 is greater than 98°C, both the main compressor 11 and the secondary compressor 31 are shut down.

[0093] According to some embodiments of the present invention, the control method of the air conditioner further includes: Determine that the water pump 42 opening condition is met, and then turn on the water pump 42; Obtain the temperature difference between the inlet and outlet refrigerant of the return air heat exchanger 43, and control and adjust the rotation speed of the water pump 42 according to the temperature difference between the inlet and outlet refrigerant.

[0094] Among them, the step of controlling and adjusting the rotation speed of the water pump 42 according to the temperature difference between the inlet and outlet refrigerant specifically includes: When the temperature difference between the inlet and outlet refrigerant is greater than or equal to the first temperature difference, control the water pump 42 to adjust to the first rotation speed; When the temperature difference between the inlet and outlet refrigerant is less than the first temperature difference and greater than or equal to the second temperature difference, control the water pump 42 to adjust to the second rotation speed; When the temperature difference between the inlet and outlet refrigerant is less than the second temperature difference and greater than or equal to the third temperature difference, control the water pump 42 to adjust to the third rotation speed; When the temperature difference between the inlet and outlet refrigerant is less than the third temperature difference and greater than or equal to the fourth temperature difference, control the water pump 42 to adjust to the fourth rotation speed; When the temperature difference between the inlet and outlet refrigerant is less than or equal to the fourth temperature difference, control the water pump 42 to adjust to the maximum rotation speed.

[0095] And the first rotation speed is less than the second rotation speed, the second rotation speed is less than the third rotation speed, and the third rotation speed is less than the fourth rotation speed.

[0096] For example, the opening condition of the water pump 42 is: the exhaust temperature of the main compressor 11 - the saturation temperature corresponding to the high pressure ≤ 10°C and the water level in the water storage tank 41 ≥ 40%.

[0097] After the water pump 42 is turned on, obtain the temperature difference of the refrigerant at the inlet and outlet of the gas return heat exchanger 43 (i.e., T1 - T2). If T1 - T2 ≥ 10°C, the water pump 42 rotates at 20% of the maximum speed; if 10°C ≥ T1 - T2 ≥ 8°C, the water pump 42 rotates at 40% of the maximum speed; if 8°C ≥ T1 - T2 ≥ 6°C, the water pump 42 rotates at 60% of the maximum speed; if 6°C ≥ T1 - T2 ≥ 4°C, the water pump 42 rotates at 80% of the maximum speed; if 4°C ≥ T1 - T2, the water pump 42 rotates at 100% of the maximum speed. It can be understood that the smaller the temperature difference, the more the water pump 42 needs to increase its speed. The larger the temperature difference, the better the effect of the water pump 42.

[0098] The closing condition of the water pump 42 is: the exhaust temperature of the main compressor 11 - the saturation temperature corresponding to the high pressure > 15°C or the water level in the water storage tank 41 ≤ 5%.

[0099] According to some embodiments of the present invention, the control method of the air conditioner further includes: Obtain the liquid level in the heat exchange water tank 32 and control the opening and closing of the water replenishing valve 46 according to the liquid level in the heat exchange water tank 32.

[0100] For example, the opening condition of the water replenishing valve 46 is: the liquid level sensor detects that the water level is lower than 60%; or, the subcooling degree of the refrigerant after condensation in the heat exchange water tank 32 (the refrigerant outlet pipe temperature - the saturation temperature corresponding to the high pressure) ≤ 5°C (the purpose is that the refrigerant can be fully condensed by low-temperature water).

[0101] The closing condition of the water replenishing valve 46 is: the liquid level sensor detects that the water level > 80% and the bottom temperature sensor detects that the water temperature ≥ 50°C; or, the water pump 42 operates. It can be understood that after the water pump 42 operates, there must be a large amount of cooled water to supplement the water in the heat exchange water tank 32, and at this time, the water replenishing valve 46 does not need to be opened.

[0102] According to some embodiments of the present invention, the control method of the air conditioner further includes: Obtain the water temperature in the heat exchange water tank 32 and the liquid level in the water storage tank 41, and control the opening degree of the regulating solenoid valve 47 according to the water temperature in the heat exchange water tank 32 and the liquid level in the water storage tank 41.

[0103] For example, the opening condition of the solenoid valve 47 is: the temperature sensor in the heat exchange water tank 32 detects that the temperature ≥ 48°C or the liquid level sensor in the water storage tank 41 detects that the liquid level ≤ 60%. The closing condition of the solenoid valve 47 is: the temperature sensor in the heat exchange water tank 32 detects that the temperature ≤ 45°C and the liquid level sensor in the water storage tank 41 detects that the liquid level ≥ 65%.

[0104] According to some embodiments of the present invention, the control method of the air conditioner further includes: Obtain the water temperature and liquid level in the water storage tank 41, and control and adjust the working state of the electric heating device 48 according to the water temperature and liquid level in the water storage tank 41.

[0105] For example, the opening condition of the electric heating device 48 is: the temperature of the water storage tank 41 < 41°C and the liquid level detected by the liquid level sensor of the water storage tank 41 ≥ 65%; the closing condition of the electric heating device 48 is: the temperature of the water storage tank 41 > 44°C or the liquid level of the water storage tank 41 ≤ 10%.

[0106] As Figure 5 shown, the control device of the air conditioner according to the third aspect embodiment of the present invention includes: An acquisition module 110, configured to acquire the temperature of the main power module 2; A control module 120, configured to control and adjust the working parameters of the main refrigerant circuit 1 and / or the secondary refrigerant circuit 3 according to the temperature of the main power module 2.

[0107] Figure 6 Illustrates a schematic physical structure diagram of an electronic device. As Figure 6 shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840. Among them, the processor 810, the communication interface 820, and the memory 830 complete mutual communication through the communication bus 840. The processor 810 can call the logical instructions in the memory 830 to execute the control method of the air conditioner, including: acquiring the temperature of the main power module 2; controlling and adjusting the working parameters of the main refrigerant circuit 1 and / or the secondary refrigerant circuit 3 according to the temperature of the main power module 2.

[0108] In addition, when the logical instructions in the above-mentioned memory 830 are implemented in the form of a software functional unit and sold or used as an independent product, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or a part of this technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in various embodiments of the present invention. The foregoing storage medium includes: various media such as a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disc that can store program codes.

[0109] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method of the air conditioner provided by the above-mentioned various methods, including: obtaining the temperature of the main power module 2; and controlling and adjusting the operating parameters of the main refrigerant circuit 1 and / or the secondary refrigerant circuit 3 according to the temperature of the main power module 2.

[0110] In another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is implemented to execute the control method of the air conditioner provided by the above-mentioned various methods, including: obtaining the temperature of the main power module 2; and controlling and adjusting the operating parameters of the main refrigerant circuit 1 and / or the secondary refrigerant circuit 3 according to the temperature of the main power module 2.

[0111] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0112] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disc, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiments.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air conditioner, characterized in that, Comprising: A main refrigerant circuit and a main power module, including a main compressor, an outdoor heat exchanger, and an indoor heat exchanger connected by a main refrigerant pipeline, where the main power module is used to drive and frequency-convert the main compressor; A secondary refrigerant circuit, including a secondary compressor, a condenser, and an evaporator connected by a secondary refrigerant pipeline, wherein the evaporator is heat-transfer connected to the main power module; A water heat exchange circuit, including a gas return heat exchanger, a water storage tank, and a water pump connected by a water pipeline, and the water pipeline flows through the condenser; an intake pipe portion of the main refrigerant pipeline is connected to the intake port of the main compressor, and the intake pipe portion flows through the gas return heat exchanger.

2. The air conditioner according to claim 1, characterized in that, The condenser is a water heat exchange tank, the water inlet and outlet of the water heat exchange tank are respectively communicated with the gas return heat exchanger and the water storage tank, and a balance pipeline is also connected between the water heat exchange tank and the water storage tank; A water replenishing port is provided on the water heat exchange tank, the water replenishing port is connected to the outside through a water replenishing pipeline, and a water replenishing valve is provided on the water replenishing pipeline; and a solenoid valve is provided between the water outlet of the water heat exchange tank and the water storage tank, and an electric heating device is provided in the water storage tank.

3. A control method for an air conditioner according to any one of claims 1 to 2, characterized in that, Comprising: Obtaining the temperature of the main power module; Controlling and adjusting the operating parameters of the main refrigerant circuit and / or the secondary refrigerant circuit according to the temperature of the main power module.

4. The control method of the air conditioner according to claim 3, wherein, The step of controlling and adjusting the operating parameters of the main refrigerant circuit and / or the secondary refrigerant circuit according to the temperature of the main power module specifically includes: Controlling the start or stop of the secondary compressor according to the temperature of the main power module; Wherein, if the temperature of the main power module is greater than or equal to a preset temperature upper limit, controlling the secondary compressor to start; or, if the temperature of the main power module is less than or equal to a preset temperature lower limit, controlling the secondary compressor to stop; or, if the temperature of the main power module is greater than or equal to the maximum allowable temperature, controlling the secondary compressor to stop.

5. The control method of the air conditioner according to claim 4, characterized in that, The step of controlling and adjusting the operating parameters of the main refrigerant circuit and / or the secondary refrigerant circuit according to the temperature of the main power module specifically includes: When the secondary compressor is started, determining the target evaporation temperature of the secondary refrigerant circuit according to the range of the temperature of the main power module; Controlling and adjusting the operating frequency of the secondary compressor according to the target evaporation temperature until the actual evaporation temperature of the secondary refrigerant circuit reaches the target evaporation temperature; Wherein, the step of determining the target evaporation temperature of the secondary refrigerant circuit according to the range of the temperature of the main power module specifically includes: When the temperature of the main power module is greater than or equal to a first set temperature, determining the target evaporation temperature as a first evaporation temperature; When the temperature of the main power module is greater than or equal to a second set temperature and less than a third set temperature, determining the target evaporation temperature as a second evaporation temperature; When the temperature of the main power module is greater than or equal to a third set temperature and less than a fourth set temperature, determining the target evaporation temperature as a third evaporation temperature; When the temperature of the main power module is greater than or equal to the fourth set temperature, determine the target evaporation temperature as the fourth evaporation temperature, and at this time, the secondary compressor operates at the set maximum frequency. Among them, the second set temperature is greater than the first set temperature, the first evaporation temperature is less than the second evaporation temperature, the second evaporation temperature is less than the third evaporation temperature, and the third evaporation temperature is less than the fourth evaporation temperature.

6. The control method of the air conditioner according to claim 5, wherein When the secondary compressor is turned on, in the step of controlling and adjusting the operating frequency of the secondary compressor according to the target evaporation temperature until the actual evaporation temperature of the secondary refrigerant circuit reaches the target evaporation temperature: When the target evaporation temperature is the first evaporation temperature, control the operating frequency of the secondary compressor not to exceed the set maximum frequency of the first percentage. When the target evaporation temperature is the second evaporation temperature, control the operating frequency of the secondary compressor not to exceed the set maximum frequency of the second percentage. When the target evaporation temperature is the third evaporation temperature, control the operating frequency of the secondary compressor not to exceed the set maximum frequency of the third percentage. Among them, the first percentage is less than the second percentage, and the second percentage is less than the third percentage.

7. The control method of the air conditioner according to claim 3, characterized in that, The step of controlling and adjusting the operating parameters of the main refrigerant circuit and / or the secondary refrigerant circuit according to the temperature of the main power module specifically includes: When the temperature of the main power module is greater than the fifth set temperature and less than or equal to the sixth set temperature, control the main compressor to reduce its frequency to the set maximum frequency of the fourth percentage. When the temperature of the main power module is greater than the sixth set temperature and less than or equal to the seventh set temperature, control the main compressor to reduce its frequency to the set maximum frequency of the fifth percentage. When the temperature of the main power module is greater than the seventh set temperature and less than or equal to the eighth set temperature, control the main compressor to reduce its frequency to the set maximum frequency of the sixth percentage. When the temperature of the main power module is greater than the eighth set temperature, control both the main compressor and the secondary compressor to stop. Among them, the fourth percentage is greater than the fifth percentage, and the fifth percentage is greater than the sixth percentage.

8. The control method of the air conditioner according to any one of claims 3 to 7, characterized in that, It also includes: Determine that the water pump start condition is met, and then start the water pump. Obtain the temperature difference between the inlet and outlet of the refrigerant of the return air heat exchanger, and control and adjust the rotational speed of the water pump according to the temperature difference between the inlet and outlet. Among them, the step of controlling and adjusting the rotational speed of the water pump according to the temperature difference between the inlet and outlet specifically includes: When the temperature difference between the inlet and outlet is greater than or equal to the first temperature difference, control the water pump to adjust to the first rotational speed. When the temperature difference between the inlet and outlet is less than the first temperature difference and greater than or equal to the second temperature difference, control the water pump to adjust to the second rotational speed. When the temperature difference between the inlet and outlet is less than the second temperature difference and greater than or equal to the third temperature difference, control the water pump to adjust to the third rotational speed. When the temperature difference between the inlet and outlet is less than the third temperature difference and greater than or equal to the fourth temperature difference, control the water pump to adjust to the fourth rotational speed. When the temperature difference between the inlet and outlet refrigerant is less than or equal to the fourth temperature difference, control the water pump to adjust to the maximum speed; And the first speed is less than the second speed, the second speed is less than the third speed, and the third speed is less than the fourth speed.

9. The control method of the air conditioner according to any one of claims 3 to 7, characterized in that It further includes: Obtain the liquid level in the heat exchange water tank, and control the opening and closing of the water replenishing valve according to the liquid level in the heat exchange water tank; And / or, obtain the water temperature in the heat exchange water tank and the liquid level in the storage water tank, and control the opening degree of the regulating solenoid valve according to the water temperature in the heat exchange water tank and the liquid level in the storage water tank; And / or, obtain the water temperature and liquid level in the storage water tank, and control the working state of the electric heating device according to the water temperature and liquid level in the storage water tank.

10. A control device for an air conditioner according to any one of claims 1 to 2, characterized in that, It includes: An acquisition module for acquiring the temperature of the main power module; A control module for controlling and adjusting the working parameters of the main refrigerant circuit and / or the secondary refrigerant circuit according to the temperature of the main power module.

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