Dual-system air conditioner and control method and control device thereof

Abstract

The invention provides a dual-system air conditioner and a control method and device thereof. The dual-system air conditioner comprises a main air conditioning system and a main system power module, wherein the main air conditioning system comprises a main refrigerant loop and a main system power module; the secondary air conditioning system comprises a secondary refrigerant loop, and the evaporator is in heat transfer connection with the main system power module; the control device comprises an acquisition module and a control module, and the acquisition module is used for acquiring the temperature of the main system power module; and the control module is used for controlling and adjusting working parameters of the main air conditioning system and / or the secondary air conditioning system according to the temperature of the main system power module. The temperature of the power module can be reduced through the low-temperature refrigerant in the evaporator of the secondary air conditioning system, the supercooling degree of the refrigerant of the condenser of the main air conditioning system is not reduced, the condensation phenomenon is not likely to occur, and the safety, reliability and the refrigerating and heating effects are guaranteed. And the two systems operate independently, so that the control is more flexible.

Description

Technical Field

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

[0002] At present, many 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. During the operation of the unit, the power module will generate a relatively high temperature. Currently, most of them are in close contact with the refrigerant radiator and the power module, and the refrigerant inside its own system 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 defect 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] There are basically two ways in the existing system. One is to reduce the refrigerant cooling temperature by the refrigerant after condensation on the high-pressure side of the system. However, this method will cause the subcooling degree before the evaporator of the original system to decrease, affecting the refrigeration and heating effects of the air conditioner. Another method is to separate a part of the medium-temperature and high-pressure liquid refrigerant after condensation, and throttle it through an electronic expansion valve to reduce the pressure to a low-temperature and low-pressure refrigerant gas-liquid mixture, thereby absorbing the temperature of the refrigerant heat dissipation. However, this method has two disadvantages. One is that the diversion causes the refrigerant circulation volume to decrease, resulting in a worse refrigeration and heating effect of the indoor unit. The other is that the electronic expansion valve throttles and reduces the pressure to a low-temperature and low-pressure refrigerant gas-liquid mixture, which is often at a relatively low temperature. In a high-humidity operating environment, through the cold bridge effect, it is often easy to cause condensation on the power module and the computer board, reducing the safety and reliability. Summary of the Invention

[0004] The present invention provides a dual-system air conditioner and its control method and control device to solve the defects existing in the prior art and achieve the following technical effects: The temperature of the power module can be reduced by the low-temperature refrigerant in the evaporator of the secondary air-conditioning system, without reducing the subcooling degree of the condenser refrigerant of the main air-conditioning system, and it is not easy to generate condensation, ensuring the safety, reliability, and refrigeration and heating effects. And the two systems operate independently of each other, making the control more flexible.

[0005] The dual-system air conditioner according to the first aspect embodiment of the present invention includes: A main air-conditioning system, including a main refrigerant circuit and a main system power module, the main refrigerant circuit including an outdoor heat exchanger, an indoor heat exchanger, and a main compressor; A secondary air-conditioning system, including a secondary refrigerant circuit, the secondary refrigerant circuit including an evaporator, a condenser, and a secondary compressor, the evaporator being heat-transfer connected to the main system power module; The control device includes an acquisition module and a control module. The acquisition module is used to acquire the temperature of the main system power module. The control module is used to control and adjust the operating parameters of the main air conditioning system and / or the secondary air conditioning system according to the temperature of the main system power module.

[0006] According to an embodiment of the present invention, the evaporator is one of a direct-cooling heat exchanger, a microchannel heat exchanger, an aluminum tube spliced heat exchanger, and a fin heat exchanger.

[0007] According to the control method of the dual-system air conditioner according to the embodiment of the second aspect of the present invention based on the embodiment of the first aspect of the present invention, it includes: Acquire the temperature of the main system power module; Control and adjust the operating parameters of the main air conditioning system and / or the secondary air conditioning system according to the temperature of the main system power module.

[0008] According to an embodiment of the present invention, the step of controlling and adjusting the operating parameters of the main air conditioning system and / or the secondary air conditioning system according to the temperature of the main system power module specifically includes: According to the range of the temperature of the main system power module, control the opening and closing of the secondary compressor, and determine the target evaporation temperature of the secondary air conditioning system; When the secondary compressor is turned on, control and adjust the operating frequency of the secondary compressor according to the target evaporation temperature until the actual evaporation temperature of the secondary air conditioning system reaches the target evaporation temperature.

[0009] According to an embodiment of the present invention, the step of controlling the opening and closing of the secondary compressor according to the range of the temperature of the main system power module and determining the target evaporation temperature of the secondary air conditioning system specifically includes: When the temperature of the main system power module is greater than or equal to the first set temperature, control the secondary compressor to start, and determine the target evaporation temperature as the first evaporation temperature; When the temperature of the main system power module 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, and at this time the secondary compressor is running; When the temperature of the main system power module 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, and at this time the secondary compressor is running; When the temperature of the main system 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.

[0010] According to an embodiment of the present invention, in the case where 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 air-conditioning system 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.

[0011] According to an embodiment of the present invention, the step of controlling and adjusting the operating parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main system power module specifically includes: Determine that the operating frequency of the secondary compressor reaches the set maximum frequency, and the temperature of the main system power module is greater than or equal to the fourth set temperature; According to the range of the temperature of the main system power module, control and adjust the operating frequency of the main compressor.

[0012] According to an embodiment of the present invention, the step of controlling and adjusting the operating frequency of the main compressor according to the range of the temperature of the main system power module specifically includes: When the temperature of the main system power module is greater than or equal to the fourth set temperature and less than the fifth set temperature, control the main compressor to reduce the frequency at the first frequency reduction speed to the first set ratio of the original operating frequency; When the temperature of the main system power module is greater than or equal to the fifth set temperature and less than the sixth set temperature, control the main compressor to reduce the frequency at the second frequency reduction speed to the second set ratio of the original operating frequency; When the temperature of the main system power module is greater than or equal to the sixth set temperature and less than the seventh set temperature, control the main compressor to reduce the frequency at the third frequency reduction speed to the third set ratio of the original operating frequency; When the temperature of the main system power module is greater than or equal to the seventh set temperature and less than the eighth set temperature, control the main compressor to reduce its frequency at a fourth frequency reduction speed to a fourth set proportion of the original operating frequency; When the temperature of the main system power module is greater than or equal to the eighth set temperature, control the main compressor to stop; Wherein, the first frequency reduction speed is less than the second frequency reduction speed, the second frequency reduction speed is less than the third frequency reduction speed, the third frequency reduction speed is less than the fourth frequency reduction speed, and the first set proportion is greater than the second set proportion, the second set proportion is greater than the third set proportion, and the third set proportion is greater than the fourth set proportion.

[0013] According to an embodiment of the present invention, the control method of the dual-system air conditioner further includes: Obtain the superheat degree of the evaporator; According to the superheat degree of the evaporator, control and adjust the opening degree of the throttling device in the secondary air conditioning system.

[0014] According to the control device of the dual-system air conditioner according to the first aspect embodiment of the present invention in the third aspect embodiment of the present invention, it includes: An acquisition module, configured to acquire the temperature of the main system power module; A control module, configured to control and adjust the operating parameters of the main air conditioning system and / or the secondary air conditioning system according to the temperature of the main system power module.

[0015] The present invention aims to provide a dual-system air conditioner and its control method and control device. By nesting a secondary system inside the main system, the secondary air conditioning system includes a secondary compressor, a condenser, an evaporator, and a throttling device. It can reduce the temperature of the power module through the low-temperature refrigerant in the evaporator of the secondary air conditioning system, and does not reduce the subcooling degree of the refrigerant in the condenser of the main air conditioning system, and it is not easy to generate a condensation phenomenon, ensuring the safety, reliability, and refrigeration and heating effects. And the two systems operate independently of each other, and the control is more flexible.

[0016] Furthermore, the present invention also has the following advantages compared with the related art.

[0017] (1) Independence and flexibility: The main air conditioning system and the secondary air conditioning system can operate independently without interference, which makes the control more flexible. Any one of the systems can be adjusted separately according to the actual situation without affecting the normal operation of the other system.

[0018] (2) Power module temperature control: The secondary air conditioning system is specifically used to control the temperature of the power module of the main air conditioning system. The temperature of the main system power module is reduced through the low-temperature refrigerant in the evaporator, which can effectively prevent the compressor from reducing its frequency due to overheating of the power module, thus ensuring the refrigeration and heating effects of the air conditioning system.

[0019] (3)Maintaining the refrigerant subcooling degree: The traditional method of reducing the refrigerant heat dissipation temperature by the refrigerant after condensation on the high-pressure side will lead to a decrease in the subcooling degree of the main system, thereby affecting the overall performance of the air conditioner. The present invention realizes the cooling of the power module through the independent operation of the secondary system, avoiding this situation, and thus ensuring that the refrigeration and heating efficiency of the main system is not affected.

[0020] (4)Avoiding the condensation phenomenon: In a high-humidity environment, the traditional throttling and pressure-reducing method of the electronic expansion valve easily causes the condensation phenomenon on the power module and the computer board, reducing the safety and reliability of the system. The refrigerant heat dissipation method adopted by the present invention will not cause the temperature to be too low, thereby reducing the risk of condensation.

[0021] (5)Intelligent control: The present invention adjusts parameters such as the compressor frequency, valve opening degree, and fan speed of the secondary system through an intelligent control method, realizing the intelligent adjustment of the operating state of the secondary system according to the change of the temperature of the power module of the main system, thereby ensuring the stability and efficiency of the system.

[0022] Therefore, the present invention not only solves the problem of overheating of the power module, but also optimizes the overall performance of the system, improving the safety and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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 use in 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, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of a dual-system air conditioner provided by the present invention.

[0025] Figure 2 It is a schematic flow diagram of the control method of the dual-system air conditioner provided by the present invention.

[0026] Figure 3 It is a schematic structural diagram of the control device of the dual-system air conditioner provided by the present invention.

[0027] Figure 4 It is a schematic structural diagram of an electronic device provided by the present invention.

[0028] Description of the reference numerals: 1. Main refrigerant circuit; 11. Main system power module; 12. Outdoor heat exchanger; 13. Indoor heat exchanger; 14. Main compressor; 15. Four-way valve; 2. Secondary refrigerant circuit; 21. Evaporator; 22. Condenser; 23. Secondary compressor; 24. Throttling device; 110. Acquisition module; 120. Control module. Detailed implementation manners

[0029] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials or characteristics described in 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 any one or more embodiments or examples in a suitable manner. In addition, without conflict, those skilled in the art can combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0031] The following introduces a dual-system air conditioner and its control method and control device according to the present invention with reference to the accompanying drawings.

[0032] As Figure 1 shown, the dual-system air conditioner according to the first aspect embodiment of the present invention includes a main air conditioner system, a secondary air conditioner system and a control device.

[0033] The main air conditioner system includes a main refrigerant circuit 1 and a main system power module 11, and the main refrigerant circuit includes an outdoor heat exchanger 12, an indoor heat exchanger 13 and a main compressor 14.

[0034] The secondary air conditioner system includes a secondary refrigerant circuit 2, and the secondary refrigerant circuit 2 includes an evaporator 21, a condenser 22 and a secondary compressor 23. The evaporator 21 is heat-transfer connected to the main system power module 11.

[0035] The control device includes an acquisition module 110 and a control module 120. The acquisition module 110 is used to acquire the temperature of the main system power module 11; the control module 120 is used to control and adjust the working parameters of the main air conditioner system and / or the secondary air conditioner system according to the temperature of the main system power module 11.

[0036] For the dual - system air conditioner according to the embodiments of the present invention, the structural compositions and their functions of each internal system will be introduced in sequence below.

[0037] The main air - conditioning system includes a main refrigerant circuit 1 and a main - system power module 11. The main refrigerant circuit 1 consists of an outdoor heat exchanger 12 (condenser 22), an indoor heat exchanger 13 (evaporator 21), and a main compressor 14. The main compressor 14 is responsible for compressing the refrigerant into a high - temperature and high - pressure gas, and then releasing heat to the external environment through the outdoor heat exchanger 12. As a result, the refrigerant becomes a medium - temperature and high - pressure liquid. Subsequently, the refrigerant passes through a throttling device 24 (not specifically mentioned but usually present) and becomes a low - temperature and low - pressure liquid or a gas - liquid mixture state. Finally, it absorbs the heat in the room through the indoor heat exchanger 13, turns into a low - temperature and low - pressure gas, and returns to the compressor to complete a cycle. The main - system power module 11 is used to drive the variable - frequency operation of the main compressor 14 and generates heat during operation.

[0038] The secondary air - conditioning system includes a secondary refrigerant circuit 2, which consists of an evaporator 21, a condenser 22, and a secondary compressor 23. Among them, the function of the evaporator 21 is to exchange heat with the main - system power module 11 through heat transfer, thereby reducing the temperature of the main - system power module 11. The secondary compressor 23 is responsible for compressing the refrigerant into a high - temperature and high - pressure gas, and then releasing heat to the external environment through the condenser 22. As a result, the refrigerant becomes a medium - temperature and high - pressure liquid. Then, the refrigerant continues to throttle and depressurize through the throttling device 24, exchanges heat with the main - system power module 11 through the evaporator 21, absorbs the heat of the main - system power module 11, thereby reducing the temperature of the main - system power module 11, and finally returns to the compressor.

[0039] The control device includes an acquisition module 110 and a control module 120. The acquisition module is responsible for monitoring the temperature of the main - system power module 11. The control module 110 decides how to adjust the operating parameters of the main air - conditioning system and / or the secondary air - conditioning system based on the obtained temperature data to ensure that the temperature of the power module is within a safe range. When it is detected that the temperature of the main - system power module 11 is too high, the control module 110 will take measures to increase the cooling capacity of the secondary air - conditioning system, such as increasing the frequency of the secondary compressor 23 or adjusting the opening of the throttling device 24, thereby indirectly reducing the temperature of the main - system power module 11.

[0040] Furthermore, based on the above structure, the specific working principle and process of the dual-system air conditioner of the present invention are introduced as follows: When the air conditioner system starts, if it is detected that the temperature of the main system power module 11 exceeds the preset safety threshold, the secondary air conditioner system starts to work. It compresses the refrigerant through the secondary compressor 23 and cools the refrigerant to the medium-temperature and high-pressure state through the condenser 22 of the secondary refrigerant circuit 2, and then exchanges heat with the main system power module 11 through the evaporator 21, thereby reducing the temperature of the main system power module 11. During this process, the control device dynamically adjusts the working parameters of the secondary air conditioner system according to the actual temperature change to achieve the best cooling effect. When the temperature of the main system power module 11 drops within the safe range, the secondary air conditioner system may reduce its working intensity or stop working. This design enables the air conditioner system to effectively manage the temperature of the power module while maintaining the cooling and heating effects, avoiding problems such as system frequency reduction or shutdown caused by overheating.

[0041] In summary, the present invention aims to provide a dual-system air conditioner. By incorporating a secondary system within the main system, the secondary air conditioner system includes a secondary compressor 23, a condenser 22, an evaporator 21, and a throttling device 24. It can reduce the temperature of the power module through the low-temperature refrigerant after the evaporator 21 of the secondary air conditioner system, without reducing the subcooling degree of the refrigerant in the condenser 22 of the main air conditioner system, and is not prone to condensation. The safety, reliability, and cooling and heating effects are guaranteed. Moreover, the two systems operate independently of each other, providing more flexible control.

[0042] Furthermore, compared with the related art, the present invention also has the following advantages.

[0043] (1) Independence and flexibility: The main air conditioner system and the secondary air conditioner system can operate independently without interference, which makes the control more flexible. Any one of the systems can be adjusted individually according to the actual situation without affecting the normal operation of the other system.

[0044] (2) Power module temperature control: The secondary air conditioner system is specifically used to control the temperature of the power module of the main air conditioner system. It reduces the temperature of the main system power module 11 through the low-temperature refrigerant in the evaporator, which can effectively prevent the compressor from reducing its frequency due to overheating of the power module, thus ensuring the cooling and heating effects of the air conditioner system.

[0045] (3) Maintaining the refrigerant subcooling degree: The traditional method of reducing the refrigerant heat dissipation temperature through the refrigerant condensed on the high-pressure side will lead to a reduction in the subcooling degree of the main system, thereby affecting the overall performance of the air conditioner. The present invention realizes the cooling of the power module through the independent operation of the secondary system, avoiding this situation, and thus ensuring that the cooling and heating efficiency of the main system is not affected.

[0046] (4) Avoid condensation: In a high-humidity environment, the traditional throttling and pressure-reducing method of an electronic expansion valve is prone to cause condensation on the power module and the computer board, reducing the safety and reliability of the system. However, the refrigerant heat dissipation method adopted in the present invention will not cause the temperature to be too low, thereby reducing the risk of condensation.

[0047] (5) Intelligent control: The present invention adjusts parameters such as the compressor frequency, valve opening, and fan speed of the secondary system through an intelligent control method, realizing intelligent adjustment of the operating state of the secondary system according to the change in the temperature of the power module 11 of the primary system, thereby ensuring the stability and efficiency of the system.

[0048] Thus, the present invention not only solves the problem of overheating of the power module, but also optimizes the overall performance of the system, improving the safety and reliability of the system.

[0049] Next, the control method, control device, and dual-system air conditioner of the present invention will be described with reference to the accompanying drawings. Among them, before describing 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 dual-system air conditioner according to the embodiments of the present invention can be applied not only to the local area of the dual-system 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, tablet computers, notebooks, in-vehicle computers, and other intelligent terminals.

[0050] Hereinafter, only the control method applicable to the dual-system 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 applied to the cloud platform and third-party devices.

[0051] As Figure 2 shown, the control method of the dual-system air conditioner according to the second aspect embodiment of the present invention includes: Step S1, obtaining the temperature of the power module 11 of the primary system; Step S2, controlling and adjusting the operating parameters of the primary air-conditioning system and / or the secondary air-conditioning system according to the temperature of the power module 11 of the primary system.

[0052] The control method of a dual-system air conditioner according to an embodiment of the present invention has the following specific working process: In step S1, real-time temperature data of the power module in the main air-conditioning system is obtained through sensors or other monitoring means. In step S2, the operating states of the main air-conditioning system and the secondary air-conditioning system are adjusted according to the temperature data obtained in step S1. Specifically, when it is detected that the temperature of the power module is relatively high, the control system will take measures to increase the cooling capacity of the secondary air-conditioning system, such as increasing the frequency of the secondary compressor 23, adjusting the opening degree of the electronic expansion valve, or changing the rotational speed of the fan, etc., so as to reduce the temperature of the main-system power module 11 through the evaporator 21 of the secondary air-conditioning system. Conversely, if the temperature drops to the safe range, the activity intensity of the secondary air-conditioning system may be reduced or the operation of the secondary air-conditioning system may be completely stopped to save energy and avoid unnecessary energy consumption.

[0053] In this way, the system can effectively manage the temperature of the power module while maintaining the cooling or heating effect of the air-conditioning system, avoid problems such as compressor frequency reduction or shutdown caused by overheating, thereby improving the operating efficiency and stability of the air-conditioning system. At the same time, such a design also helps to reduce the condensation phenomenon of the air-conditioning system in a high-humidity environment, improving the safety and reliability of the system.

[0054] According to some embodiments of the present invention, the step of controlling and adjusting the working parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main-system power module 11 specifically includes: According to the range of the temperature of the main-system power module 11, control the opening and closing of the secondary compressor 23, and determine the target evaporation temperature of the secondary air-conditioning system; When the secondary compressor 23 is turned on, according to the target evaporation temperature, control and adjust the working frequency of the secondary compressor 23 until the actual evaporation temperature of the secondary air-conditioning system reaches the target evaporation temperature.

[0055] In this embodiment, when the temperature of the main-system power module 11 is lower than a certain specific value (such as 43 °C), the secondary compressor 23 does not need to operate, and at this time the secondary air-conditioning system does not work. As the temperature rises, when the temperature of the power module reaches a specific range (such as 50 °C and above), the secondary compressor 23 will start and set different target evaporation temperatures according to different temperature ranges. For example, when the temperature is between 50 °C and 75 °C, the target evaporation temperature will be gradually adjusted as the temperature rises to ensure that the secondary air-conditioning system can effectively reduce the temperature of the power module of the main system. In a higher temperature range (such as 90 °C and above), the target evaporation temperature of the secondary air-conditioning system will be further lowered, and at the same time the secondary compressor 23 will operate at the highest frequency to quickly reduce the temperature of the power module, and may be accompanied by increasing the operating speed of the outdoor fan.

[0056] After the current compressor 23 starts, the control system adjusts the operating frequency of the secondary compressor 23 according to the set target evaporation temperature. If the actual evaporation temperature fails to reach the target value, the compressor frequency will continue to increase until the actual evaporation temperature is consistent with the target. Once the target evaporation temperature is reached, the compressor frequency will tend to be stable. If the actual evaporation temperature exceeds the target value, the compressor frequency will be reduced to prevent the evaporation temperature from being too high.

[0057] This control method ensures that the secondary air-conditioning system can effectively respond to the temperature change of the main system power module 11 and achieve fine control of the power module temperature by dynamically adjusting the frequency of the secondary compressor 23.

[0058] In this way, through the above method, the control method of the present invention can ensure that even in extreme cases, the power module temperature of the main air-conditioning system can be effectively controlled by the secondary air-conditioning system, thereby avoiding the decline of system performance caused by overheating, and at the same time reducing energy consumption and maintenance costs.

[0059] In some specific embodiments of the present invention, the steps of controlling the opening and closing of the secondary compressor 23 and determining the target evaporation temperature of the secondary air-conditioning system according to the range of the temperature of the main system power module 11 specifically include: When the temperature of the main system power module 11 is greater than or equal to the first set temperature, control the secondary compressor 23 to start and determine the target evaporation temperature as the first evaporation temperature; When the temperature of the main system power module 11 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, and at this time the secondary compressor 23 is running; When the temperature of the main system power module 11 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, and at this time the secondary compressor 23 is running; When the temperature of the main system power module 11 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 23 operates at the set maximum frequency.

[0060] 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.

[0061] Further, in the step of controlling and adjusting the operating frequency of the secondary compressor 23 according to the target evaporation temperature until the actual evaporation temperature of the secondary air-conditioning system reaches the target evaporation temperature when the secondary compressor 23 is turned on: When the target evaporation temperature is the first evaporation temperature, control the operating frequency of the secondary compressor 23 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 23 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 23 not to exceed the set maximum frequency of the third percentage.

[0062] Wherein, the first percentage is less than the second percentage, and the second percentage is less than the third percentage.

[0063] It can be understood that the temperature of the main system power module 11 of the main air-conditioning system is related to the refrigerant circulation volume and temperature difference of the secondary air-conditioning system. The higher the refrigerant circulation volume of the secondary air-conditioning system, the lower the temperature of the main system power module 11; the lower the outlet temperature of the condenser 22 of the secondary air-conditioning system, that is, the lower the subcooling degree of the condenser 22 and the lower the inlet temperature of the evaporator 21, the lower the temperature of the main system power module 11.

[0064] Specifically, the operating frequency f of the secondary compressor 23 of the secondary air-conditioning system acts according to the evaporation temperature Ts. If the target evaporation temperature cannot be reached, the secondary compressor 23 will continuously increase its frequency; if the target evaporation temperature is reached, the frequency of the secondary compressor 23 will tend to be stable; if the target evaporation temperature is exceeded, the secondary compressor 23 will decrease its frequency. That is, by setting the target evaporation temperature in advance, the higher the temperature of the main system power module 11, the lower the target evaporation temperature, and the higher the frequency of the secondary compressor 23 needs to be increased to reach the target evaporation temperature. When the frequency of the secondary compressor 23 increases, the overall refrigerant circulation volume of the secondary air-conditioning system increases, and the heat exchange temperature between the evaporator 21 and the main system power module 11 increases, so the refrigeration effect is better, that is, more heat is taken away from the main system power module 11, and the temperature of the power module is reduced. 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 system power module 11.

[0065] For example, when the temperature Tf of the main system power module 11 ≥ Tao (ambient temperature) + 10°C and Tf ≥ 50°C, the secondary air-conditioning system 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 23 starts, the highest operating frequency is 50% of the set maximum frequency to prevent the frequency of the secondary compressor 23 from fluctuating frequently. For every 1°C increase in Tf, the frequency of the secondary compressor 23 increases by 2 Hz.

[0066] 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 23 increases by 2 Hz, and the highest operating frequency of the secondary compressor 23 is 70% of the set maximum frequency.

[0067] 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 23 increases by 3 Hz, and the maximum operating frequency of the secondary compressor 23 is 85% of the set maximum frequency.

[0068] When Tf ≥ 90°C, the target evaporation temperature Ts (taking R410a refrigerant as an example) is 1°C. The secondary compressor 23 operates at the set maximum frequency.

[0069] The above four cases all implement PID control. When the temperature of the main system power module 11 stops rising and stabilizes, after stabilization, the frequency of the secondary compressor 23 is reduced at a speed of 1 rps for 10 seconds to prevent frequent fluctuations in the secondary air-conditioning system.

[0070] In addition, when the temperature of the main air-conditioning system power module drops to 43°C < Tf < 45°C, the secondary compressor 23 of the secondary air-conditioning system is reduced to 10% of the set maximum frequency.

[0071] When the temperature of the main air-conditioning system power module drops to Tf < 43°C and Tf ≤ Tao + 5°C and lasts for 3 minutes, the secondary compressor 23 of the secondary air-conditioning system shuts down.

[0072] According to some embodiments of the present invention, the throttling device 24 of the secondary air-conditioning system can be controlled according to the superheat of the evaporator 21 (in a system with a low-pressure pressure sensor, the superheat can be calculated by the evaporator 21 outlet temperature - the saturation temperature corresponding to the low-pressure pressure), or the temperature difference between the inlet and outlet (in a system without a low-pressure pressure sensor, the superheat can be calculated by the evaporator 21 outlet temperature - the middle-section temperature of the evaporator 21). Under normal operating conditions, the superheat ≥ 0°C.

[0073] According to some embodiments of the present invention, the steps of controlling and adjusting the working parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main system power module 11 specifically include: Determine that the operating frequency of the secondary compressor 23 reaches the set maximum frequency, and the temperature of the main system power module 11 is greater than or equal to the fourth set temperature; According to the range of the temperature of the main system power module 11, control and adjust the operating frequency of the main compressor 14.

[0074] For example, when the temperature Tf of the main system power module 11 ≥ 90°C, and the frequency of the secondary compressor 23 reaches the set maximum frequency and the operating time exceeds 5 minutes, the main compressor 14 of the main air-conditioning system implements a stepped frequency reduction strategy. That is, the secondary air-conditioning system has already output its maximum capacity, but the temperature of the main system power module 11 still cannot be reduced. At this time, it is necessary to reduce the frequency of the main compressor 14 of the main air-conditioning system to reduce the heat generation of the main system power module 11.

[0075] In some specific embodiments of the present invention, the step of controlling and adjusting the operating frequency of the main compressor 14 according to the temperature range of the main system power module 11 specifically includes: When the temperature of the main system power module 11 is greater than or equal to the fourth set temperature and less than the fifth set temperature, control the main compressor 14 to reduce its frequency at the first frequency reduction speed to the first set proportion of the original operating frequency; When the temperature of the main system power module 11 is greater than or equal to the fifth set temperature and less than the sixth set temperature, control the main compressor 14 to reduce its frequency at the second frequency reduction speed to the second set proportion of the original operating frequency; When the temperature of the main system power module 11 is greater than or equal to the sixth set temperature and less than the seventh set temperature, control the main compressor 14 to reduce its frequency at the third frequency reduction speed to the third set proportion of the original operating frequency; When the temperature of the main system power module 11 is greater than or equal to the seventh set temperature and less than the eighth set temperature, control the main compressor 14 to reduce its frequency at the fourth frequency reduction speed to the fourth set proportion of the original operating frequency; When the temperature of the main system power module 11 is greater than or equal to the eighth set temperature, control the main compressor 14 to stop operating.

[0076] Wherein, the first frequency reduction speed is less than the second frequency reduction speed, the second frequency reduction speed is less than the third frequency reduction speed, the third frequency reduction speed is less than the fourth frequency reduction speed, and the first set proportion is greater than the second set proportion, the second set proportion is greater than the third set proportion, and the third set proportion is greater than the fourth set proportion.

[0077] For example, when the temperature of the main system power module 11 is between 90°C and 92°C, the system detects that the temperature of the main system power module 11 is relatively high, but it is not necessary to significantly reduce the frequency. Therefore, the frequency of the main compressor 14 is reduced to 75% of the original operating frequency at a relatively slow first frequency reduction speed (1 rps per second) to gently reduce the load of the main compressor 14.

[0078] When the temperature of the main system power module 11 is between 92°C and 94°C, the temperature further rises. The system adopts a faster frequency reduction strategy and reduces the frequency of the main compressor 14 to 50% of the original operating frequency at the second frequency reduction speed (2 rps per second), accelerating the temperature reduction speed.

[0079] When the temperature of the main system power module 11 is between 94°C and 96°C, the temperature continues to rise. The system adopts a more aggressive frequency reduction strategy and reduces the frequency of the main compressor 14 to 25% of the original operating frequency at the third frequency reduction speed (3 rps per second), further increasing the temperature reduction intensity.

[0080] When the temperature of the main system power module 11 is between 96°C and 98°C, the temperature is close to the critical value. The system reduces the frequency of the main compressor 14 to 10% of the original operating frequency at the fastest fourth frequency reduction rate (4 rps per second), almost shutting down the main compressor 14 to prevent the temperature from rising further.

[0081] When the temperature of the main system power module 11 reaches or exceeds 98°C, the system considers that the operation of the main compressor 14 can no longer ensure safety, so it directly shuts down to prevent damage that may be caused by further temperature increase.

[0082] In this way, through the above hierarchical frequency reduction strategy, the system can adjust the working state of the main compressor 14 in a timely manner according to the actual temperature change of the main system power module 11, thereby effectively controlling the temperature and ensuring the safe operation of the system.

[0083] As Figure 3 shown, the control device of the dual-system air conditioner according to the third aspect embodiment of the present invention includes: An acquisition module 110 for acquiring the temperature of the main system power module 11; A control module 120 for controlling and adjusting the working parameters of the main air conditioning system and / or the secondary air conditioning system according to the temperature of the main system power module 11.

[0084] Figure 4 Illustrates a schematic physical structure diagram of an electronic device. As Figure 4 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 communication with each other through the communication bus 840. The processor 810 can call the logical instructions in the memory 830 to execute the control method of the dual-system air conditioner, including: acquiring the temperature of the main system power module 11; controlling and adjusting the working parameters of the main air conditioning system and / or the secondary air conditioning system according to the temperature of the main system power module 11.

[0085] In addition, when the logical instructions in the above-mentioned memory 830 can be implemented in the form of software functional units and sold or used as independent products, 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 the 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 can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods according to the various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0086] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program. The computer program 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 dual-system air conditioner provided by the above-mentioned various methods, including: obtaining the temperature of the main system power module 11; and controlling and adjusting the operating parameters of the main air conditioner system and / or the secondary air conditioner system according to the temperature of the main system power module 11.

[0087] In yet 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 dual-system air conditioner provided by the above-mentioned various methods, including: obtaining the temperature of the main system power module 11; and controlling and adjusting the operating parameters of the main air conditioner system and / or the secondary air conditioner system according to the temperature of the main system power module 11.

[0088] 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 may be 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. A person of ordinary skill in the art can understand and implement it without creative efforts.

[0089] 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. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable 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.

[0090] 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 cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-system air conditioner, characterized in that, Comprising: A main air-conditioning system, including a main refrigerant circuit and a main system power module, wherein the main refrigerant circuit includes an outdoor heat exchanger, an indoor heat exchanger and a main compressor; A secondary air-conditioning system, including a secondary refrigerant circuit, wherein the secondary refrigerant circuit includes an evaporator, a condenser and a secondary compressor, and the evaporator is heat-transfer connected to the main system power module; A control device, including an acquisition module and a control module, wherein the acquisition module is used to acquire the temperature of the main system power module; the control module is used to control and adjust the operating parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main system power module.

2. The dual-system air conditioner according to claim 1, wherein The evaporator is one of a direct-cooling heat exchanger, a micro-channel heat exchanger, an aluminum tube spliced heat exchanger and a fin heat exchanger.

3. A control method for a dual-system air conditioner according to claim 1 or 2, characterized in that, Comprising: Acquiring the temperature of the main system power module; Controlling and adjusting the operating parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main system power module.

4. The control method of the dual-system air conditioner according to claim 3, wherein, The step of controlling and adjusting the operating parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main system power module specifically includes: Controlling the opening and closing of the secondary compressor according to the range of the temperature of the main system power module, and determining the target evaporation temperature of the secondary air-conditioning system; When the secondary compressor is turned on, controlling and adjusting the operating frequency of the secondary compressor according to the target evaporation temperature until the actual evaporation temperature of the secondary air-conditioning system reaches the target evaporation temperature.

5. The control method of the dual-system air conditioner according to claim 4, characterized in that, The step of controlling the opening and closing of the secondary compressor according to the range of the temperature of the main system power module, and determining the target evaporation temperature of the secondary air-conditioning system specifically includes: When the temperature of the main system power module is greater than or equal to a first set temperature, controlling the secondary compressor to start, and determining the target evaporation temperature as a first evaporation temperature; When the temperature of the main system 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, and at this time the secondary compressor is running; When the temperature of the main system 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, and at this time the secondary compressor is running; When the temperature of the main system power module is greater than or equal to a fourth set temperature, determining the target evaporation temperature as a fourth evaporation temperature, and at this time the secondary compressor operates at a 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.

6. The control method of the dual-system air conditioner according to claim 5, characterized in that, 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 air-conditioning system reaches the target evaporation temperature: When the target evaporation temperature is the first evaporation temperature, controlling the operating frequency of the secondary compressor not to exceed a 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 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.

7. The control method of the dual-system air conditioner according to any one of claims 3 to 6, characterized in that, The step of controlling and adjusting the operating parameters of the main air conditioning system and / or the secondary air conditioning system according to the temperature of the main system power module specifically includes: Determine that the operating frequency of the secondary compressor reaches the set maximum frequency, and the temperature of the main system power module is greater than or equal to the fourth set temperature; Control and adjust the operating frequency of the main compressor according to the range of the temperature of the main system power module.

8. The control method of the dual-system air conditioner according to claim 7, characterized in that, The step of controlling and adjusting the operating frequency of the main compressor according to the range of the temperature of the main system power module specifically includes: When the temperature of the main system power module is greater than or equal to the fourth set temperature and less than the fifth set temperature, control the main compressor to reduce the frequency at the first frequency reduction speed to the first set ratio of the original operating frequency; When the temperature of the main system power module is greater than or equal to the fifth set temperature and less than the sixth set temperature, control the main compressor to reduce the frequency at the second frequency reduction speed to the second set ratio of the original operating frequency; When the temperature of the main system power module is greater than or equal to the sixth set temperature and less than the seventh set temperature, control the main compressor to reduce the frequency at the third frequency reduction speed to the third set ratio of the original operating frequency; When the temperature of the main system power module is greater than or equal to the seventh set temperature and less than the eighth set temperature, control the main compressor to reduce the frequency at the fourth frequency reduction speed to the fourth set ratio of the original operating frequency; When the temperature of the main system power module is greater than or equal to the eighth set temperature, control the main compressor to stop; Wherein, the first frequency reduction speed is less than the second frequency reduction speed, the second frequency reduction speed is less than the third frequency reduction speed, the third frequency reduction speed is less than the fourth frequency reduction speed, and the first set ratio is greater than the second set ratio, the second set ratio is greater than the third set ratio, and the third set ratio is greater than the fourth set ratio.

9. The control method of the dual-system air conditioner according to any one of claims 3 to 6, characterized in that, It further includes: Obtain the superheat degree of the evaporator; Control and adjust the opening degree of the throttling device in the secondary air conditioning system according to the superheat degree of the evaporator.

10. A control device for a dual-system air conditioner according to claim 1, characterized in that, It includes: An acquisition module for acquiring the temperature of the main system power module; A control module for controlling and adjusting the operating parameters of the main air conditioning system and / or the secondary air conditioning system according to the temperature of the main system power module.

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