Heat pump air conditioner system and control method

Abstract

The present application relates to the technical field of air conditioners, and provides a heat pump air conditioner system and a control method. The heat pump air conditioner system comprises a first sensor, a compressor, an evaporator, a condenser, an efficiency improvement assembly, and a controller; the first sensor is used for measuring outdoor ambient temperature; the compressor, the evaporator, and the condenser are circularly connected; the efficiency improvement assembly comprises a first valve, a first throttling device, and an economizer which are connected in sequence; the first valve is connected to the condenser; a first heat exchange path of the economizer is connected between the evaporator and the condenser, and a second heat exchange path of the economizer is separately connected to the first throttling device and a vapor injection port of the compressor; and the controller is separately connected to the compressor, the first sensor, and the first valve and is used for controlling the opening / closing of the first valve on the basis of an operation mode of the heat pump air conditioner system and the measured outdoor ambient temperature. The present application can effectively improve the operating efficiency and the energy efficiency ratio of the system, thereby improving use experience of users.

Description

Heat pump air conditioning system and control method

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202410485697X, filed on April 22, 2024, entitled "Heat Pump Air Conditioning System and Control Method", which is incorporated herein by reference in its entirety. Technical Field

[0003] This application relates to the field of air conditioning technology, and in particular to a heat pump air conditioning system and control method. Background Technology

[0004] In related technologies, for air source heat pump air conditioning systems, during cooling operation under high summer temperatures, the cooling efficiency of the heat pump air conditioning system decreases when the outdoor ambient temperature is high, resulting in a lower energy efficiency ratio. Conversely, during heating operation under low winter temperatures, the heating efficiency of the air source heat pump decreases when the ambient temperature is low, resulting in a lower energy efficiency ratio, thus affecting the cooling and heating performance and leading to a poor user experience. Summary of the Invention

[0005] This application provides a heat pump air conditioning system and control method to solve the defects of heat pump air conditioning systems in the related technology, which have low energy efficiency when operating at high temperatures in summer and low temperatures in winter, resulting in a poor user experience. It can enable the heat pump air conditioning system to work well in both high temperatures in summer and low temperatures in winter, greatly improve the energy efficiency level, and thus improve the user experience.

[0006] This application provides a heat pump air conditioning system, including:

[0007] The first sensor is used to detect the outdoor ambient temperature;

[0008] A compressor, evaporator, and condenser connected in a cycle;

[0009] The efficiency-enhancing component includes a first valve, a first throttling device, and an economizer connected in sequence. The first valve is connected to the condenser. The first heat exchange flow path of the economizer is connected between the evaporator and the condenser. The second heat exchange flow path of the economizer is connected to the first throttling device and the gas injection port of the compressor, respectively.

[0010] The controller is connected to the compressor, the first sensor, and the first valve respectively, and is used to control the opening and closing of the first valve according to the operating mode of the heat pump air conditioning system and the detected outdoor ambient temperature.

[0011] According to the heat pump air conditioning system provided in this application, it further includes:

[0012] A four-way valve is connected to the controller, with its first end connected to the exhaust port of the compressor, its second end connected to the evaporator, its third end connected to the condenser, and its fourth end connected to the suction port of the compressor.

[0013] According to the heat pump air conditioning system provided in this application, the efficiency-enhancing component further includes:

[0014] The regenerator has a third heat exchange path connected between the evaporator and the first heat exchange path of the economizer, and a fourth heat exchange path connected between the fourth end of the four-way valve and the suction port of the compressor.

[0015] According to the heat pump air conditioning system provided in this application, the third heat exchange flow path of the regenerator is connected to the first heat exchange flow path of the economizer via a second throttling device.

[0016] According to the heat pump air conditioning system provided in this application, the fourth heat exchange flow path of the regenerator is connected to the suction port of the compressor via a gas-liquid separator.

[0017] According to the heat pump air conditioning system provided in this application, it further includes:

[0018] The second sensor is installed on the condenser to detect the defrost temperature;

[0019] The third sensor is used to detect the outdoor wet-bulb temperature.

[0020] The second valve is connected to the exhaust port of the compressor;

[0021] The third throttling device is connected to the second valve and the inlet of the condenser, respectively;

[0022] The controller is connected to the second sensor, the third sensor and the second valve respectively, and is used to control the opening and closing of the second valve according to the detected defrost temperature and the outdoor wet-bulb temperature when the heat pump air conditioning system is running in heating mode.

[0023] This application also provides a control method for the above-mentioned heat pump air conditioning system, including:

[0024] Obtain the operating mode and outdoor ambient temperature of the heat pump air conditioning system;

[0025] The opening and closing of the first valve is controlled according to the operating mode of the heat pump air conditioning system and the outdoor ambient temperature.

[0026] According to the control method of a heat pump air conditioning system provided in this application, the step of controlling the opening and closing of the first valve according to the operating mode of the heat pump air conditioning system and the outdoor ambient temperature includes:

[0027] When the heat pump air conditioning system is running in cooling mode, if the outdoor ambient temperature is determined to be greater than or equal to a first set value, the first valve is controlled to open; if the outdoor ambient temperature is determined to be less than the first set value, the first valve is controlled to close.

[0028] When the heat pump air conditioning system is operating in heating mode, if the outdoor ambient temperature is determined to be less than or equal to a second set value, the first valve is controlled to open; if the outdoor ambient temperature is determined to be greater than the second set value, the first valve is controlled to close.

[0029] According to the control method of the heat pump air conditioning system provided in this application, it further includes:

[0030] When the heat pump air conditioning system is operating in heating mode, the defrost temperature and the outdoor wet-bulb temperature are obtained;

[0031] The opening and closing of the second valve between the compressor's exhaust port and the condenser's inlet is controlled based on the defrost temperature and the outdoor wet-bulb temperature.

[0032] According to the control method of a heat pump air conditioning system provided in this application, the step of controlling the opening and closing of the second valve between the compressor exhaust port and the condenser inlet based on the defrost temperature and the outdoor wet-bulb temperature includes:

[0033] If the defrost temperature is determined to be less than or equal to the outdoor wet-bulb temperature, the second valve is controlled to open.

[0034] If the defrosting temperature is determined to be greater than the outdoor wet-bulb temperature, the second valve is controlled to close.

[0035] The heat pump air conditioning system and control method provided in this application, by introducing efficiency-enhancing components and intelligent control strategies, can optimize the operation of the heat pump air conditioning system under high-temperature summer and low-temperature winter conditions, improve the energy efficiency ratio and cooling / heating effect, thereby improving the user experience. By turning the economizer on and off in a timely manner, the system's operating status can be adjusted according to the actual ambient temperature to adapt to various operating conditions and achieve efficient operation, thus improving the user experience. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in this application or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 is a structural schematic diagram of the heat pump air conditioning system provided in this application;

[0038] Figure 2 is one of the flowcharts illustrating the control method of the heat pump air conditioning system provided in this application; and

[0039] Figure 3 is a second schematic flowchart of the control method for the heat pump air conditioning system provided in this application.

[0040] Reference numerals: 1: Compressor; 2: Evaporator; 3: Condenser; 4: First valve; 5: First throttling device; 6: Economizer; 601: First heat exchange path; 602: Second heat exchange path; 7: Four-way valve; 8: Regenerator; 801: Third heat exchange path; 802: Fourth heat exchange path; 9: Second throttling device; 10: Gas-liquid separator; 11: Second sensor; 12: Second valve; 13: Third throttling device; 14: Sensor detection module; 15: Indoor fan; 16: Outdoor fan. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] In the description of the embodiments of this application, it should be noted that the terms "first", "second", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0045] The heat pump air conditioning system and control method of this application are described below with reference to Figures 1-3.

[0046] According to an embodiment of the first aspect of this application, as shown in FIG1, the heat pump air conditioning system provided by this application mainly includes: a first sensor, a compressor 1, an evaporator 2, a condenser 3, an efficiency-enhancing component, and a controller, etc.

[0047] The first sensor is used to detect the outdoor ambient temperature in real time, providing accurate data input for system control.

[0048] Compressor 1, evaporator 2, and condenser 3 are the basic components of a heat pump air conditioning system. They are connected in a main loop to achieve the cooling or heating process.

[0049] The efficiency-enhancing component is the core improvement of this application, aiming to improve the system's energy efficiency ratio. The component mainly includes a first valve 4, a first throttling device 5, and an economizer 6 connected in sequence. The first valve 4 is connected to the condenser 3. The economizer 6 includes a first heat exchange path 601 and a second heat exchange path 602 that can exchange heat with each other. The first heat exchange path 601 of the economizer 6 is connected between the evaporator 2 and the condenser 3, allowing the refrigerant in the main circuit to undergo primary subcooling in the economizer 6, increasing the subcooling degree of the refrigerant and thus improving operating efficiency. The second heat exchange path 602 of the economizer 6 is connected to the first throttling device 5 and the compressor 1's injection port, respectively. Through this design, the system can achieve a vapor injection enthalpy enhancement effect, increasing the refrigerant flow rate and further improving operating efficiency.

[0050] The controller is connected to compressor 1, the first sensor, and the first valve 4, and is used to automatically control the opening and closing of the first valve 4 according to the operating mode (cooling or heating) of the heat pump air conditioning system and the detected outdoor ambient temperature. This intelligent control strategy can adjust the system's operating state according to actual working conditions, ensuring efficient operation under various environmental conditions (especially high temperatures in summer and low temperatures in winter).

[0051] Specifically, when the system is operating in summer cooling mode, if the outdoor ambient temperature is greater than or equal to the first set value, it indicates that the outdoor ambient temperature is high, which can easily lead to a decrease in system operating efficiency. At this time, the first control valve 4 opens, and the high-temperature, high-pressure gaseous refrigerant generated by the compressor 1 enters the condenser 3 to condense and release heat. The condensed refrigerant is divided into two paths: one path flows through the main circuit into the first heat exchange path 601 of the economizer 6, and the other path flows through the auxiliary circuit to the first throttling device 5 for throttling and cooling. The throttled and cooled refrigerant then flows into the second heat exchange path 602 of the economizer 6 to exchange heat with the refrigerant in the first heat exchange path 601, cooling it down to achieve first-stage subcooling. This can increase the heat absorption capacity of the refrigerant in the evaporator 2, thereby improving the cooling efficiency. The subcooled refrigerant flows into the evaporator 2 to evaporate and absorb heat, and finally flows back to the compressor 1. At the same time, the refrigerant in the second heat exchange path 602 of the economizer 6 heats up and becomes gaseous refrigerant, which flows back to the compressor 1 to achieve vapor injection and enthalpy increase, which can increase the refrigerant flow through the condenser 3 and further improve the cooling efficiency. When the outdoor ambient temperature is lower than the first set value, it indicates that the system is operating stably. At this time, the first valve 4 is closed and the economizer 6 does not function.

[0052] When the system is running in heating mode, if the outdoor ambient temperature is less than or equal to the second set value, it indicates that the outdoor ambient temperature is low, which can easily lead to a decrease in the system's energy efficiency. At this time, the first valve 4 is opened, and the high-temperature, high-pressure gaseous refrigerant generated by the compressor 1 enters the evaporator 2 for condensation and heat release. The condensed refrigerant flows into the first heat exchange path 601 of the economizer 6, and then splits into two paths: one flows into the condenser 3 through the main circuit, and the other flows to the first throttling device 5 through the auxiliary circuit for throttling and cooling. The throttled and cooled refrigerant then flows into the second heat exchange path 602 of the economizer 6 to exchange heat with the refrigerant in the first heat exchange path 601, cooling it down to achieve first-stage subcooling. This increases the heat absorption capacity of the refrigerant in the condenser 3, thereby improving heating efficiency. The subcooled refrigerant flows into the condenser 3 for evaporation and heat absorption, and finally flows back to the compressor 1. At the same time, the refrigerant in the second heat exchange path 602 of the economizer 6 heats up and becomes gaseous refrigerant, which flows back to the compressor 1 to achieve vapor injection and enthalpy increase, which increases the refrigerant flow through the evaporator 2 and further improves heating efficiency. When the outdoor ambient temperature is greater than the second set value, it indicates that the system is operating stably. At this time, the first valve 4 is closed, and the economizer 6 does not function.

[0053] This embodiment of the application utilizes the refrigerant in the auxiliary circuit to subcool the refrigerant in the main circuit, which increases the heat absorption capacity of the refrigerant in the evaporator 2 or condenser 3. Furthermore, the gas injection can increase the refrigerant flow rate through the condenser 3 or evaporator 2, thereby increasing the cooling or heating capacity of the heat pump system. At the same time, the increase in the refrigerant flow rate through the compressor 1 can reduce its exhaust temperature. The rate of increase in the heating or cooling capacity of the heat pump system is greater than the rate of increase in the power consumption of the heat pump system, which can effectively improve the COP (coefficient of performance) and EER (energy efficiency ratio) of the heat pump air conditioning system.

[0054] Therefore, the heat pump air conditioning system provided in this application, through innovative efficiency-enhancing components and intelligent control strategies, can effectively solve the problem of reduced energy efficiency ratio in traditional heat pump air conditioning systems under extreme environmental conditions. By monitoring the outdoor ambient temperature in real time and adjusting the system's operating status accordingly, the system can achieve efficient operation in both high-temperature summer and low-temperature winter environments, improving user satisfaction and reducing energy consumption.

[0055] According to one embodiment of this application, referring to FIG1, the heat pump air conditioning system further includes a four-way valve 7, which is connected to a controller. The first end of the four-way valve 7 is connected to the exhaust port of the compressor 1, the second end of the four-way valve 7 is connected to the evaporator 2, the third end of the four-way valve 7 is connected to the condenser 3, and the fourth end of the four-way valve 7 is connected to the suction port of the compressor 1. The four-way valve 7 plays a crucial role in switching and controlling the refrigerant flow direction in the heat pump air conditioning system.

[0056] Specifically, after the compressor 1 completes the compression process of the refrigerant, the high-temperature and high-pressure refrigerant will be discharged from the exhaust port and its flow direction will be switched through the four-way valve 7, thereby realizing the switching of the cooling and heating modes.

[0057] In cooling mode, the first and third ends of the four-way valve 7 are connected, and the second and fourth ends are connected. The refrigerant discharged from the compressor 1 enters the condenser 3 through the first and third ends of the four-way valve 7 to condense and release heat, and then enters the evaporator 2 to absorb heat from the indoor air and evaporate, thereby reducing the indoor temperature. Finally, it flows back to the compressor 1 through the second and fourth ends of the four-way valve 7.

[0058] In heating mode, the first and second ends of the four-way valve 7 are connected, and the third and fourth ends are connected. The refrigerant discharged from the compressor 1 enters the evaporator 2 through the first and second ends of the four-way valve 7 to condense and release heat, raising the indoor temperature. Then it enters the condenser 3 to evaporate and absorb heat, and finally flows back to the compressor 1 through the third and fourth ends of the four-way valve 7.

[0059] This embodiment of the application controls the four-way valve 7 via a controller, which can switch the flow direction of refrigerant between the compressor 1, evaporator 2, and condenser 3 according to the operating mode (cooling or heating) and actual needs of the heat pump air conditioning system, ensuring that the system can operate efficiently under different operating conditions. This design enhances the system's flexibility and adaptability, helping to improve the overall energy efficiency ratio and user experience.

[0060] According to one embodiment of this application, referring to FIG1, the efficiency improvement component further includes: a regenerator 8, which includes a third heat exchange flow path 801 and a fourth heat exchange flow path 802 that can exchange heat with each other. The third heat exchange flow path 801 of the regenerator 8 is connected between the evaporator 2 and the first heat exchange flow path 601 of the economizer 6, and the fourth heat exchange flow path 802 of the regenerator 8 is connected between the fourth end of the four-way valve 7 and the suction port of the compressor 1.

[0061] Specifically, when the system operates in cooling mode, the refrigerant flows through the condenser 3 and the economizer 6, and then enters the third heat exchange path 801 of the regenerator 8 to exchange heat with the refrigerant in the fourth heat exchange path 802, thus raising its temperature. The heated refrigerant then enters the suction port of the compressor 1, increasing the system suction temperature. Furthermore, the refrigerant in the third heat exchange path 801 of the regenerator 8 is cooled down, achieving secondary subcooling. This further increases the heat absorption capacity of the refrigerant in the evaporator 2, thereby improving the cooling efficiency. The subcooled refrigerant then enters the evaporator 2 to absorb heat and evaporate, further improving the system's cooling efficiency and energy efficiency ratio.

[0062] When the system operates in heating mode, the refrigerant flows through the evaporator 2 and enters the third heat exchange path 801 of the regenerator 8, where it exchanges heat with the refrigerant in the fourth heat exchange path 802 to raise its temperature. The heated refrigerant then enters the suction port of the compressor 1, increasing the system suction temperature. Furthermore, the refrigerant in the third heat exchange path 801 of the regenerator 8 is cooled down, achieving secondary subcooling. This further increases the heat absorption capacity of the refrigerant in the condenser 3, thereby improving the heating efficiency. The subcooled refrigerant then enters the condenser 3 through the economizer 6 to absorb heat and evaporate, further improving the system's heating efficiency and energy efficiency ratio.

[0063] By introducing the regenerator 8, this embodiment of the application enables the heat pump air conditioning system to achieve increased suction temperature and secondary subcooling of the refrigerant in both heating and cooling conditions, further optimizing the system's performance and energy efficiency. This design helps improve system stability and comfort while reducing energy consumption, providing users with more efficient and energy-saving air conditioning services.

[0064] According to one embodiment of this application, as shown in FIG1, the third heat exchange flow path 801 of the regenerator 8 is connected to the first heat exchange flow path 601 of the economizer 6 via the second throttling device 9, and the second throttling device 9 mainly plays the role of throttling.

[0065] According to one embodiment of this application, as shown in FIG1, the fourth heat exchange flow path 802 of the regenerator 8 is connected to the suction port of the compressor 1 via the gas-liquid separator 10.

[0066] Specifically, in cooling and heating modes: after the refrigerant flows through the fourth heat exchange path 802 of the regenerator 8 and exchanges heat with the third heat exchange path 801 to increase its temperature, it first enters the gas-liquid separator 10.

[0067] The function of the gas-liquid separator 10 is to separate the liquid and gaseous portions of the refrigerant, ensuring that only the gaseous refrigerant enters the suction port of the compressor 1, thus preventing liquid slugging from damaging the compressor 1.

[0068] By processing the gas-liquid separator 10, the quality of the refrigerant entering the compressor 1 can be improved, the operating risk of the compressor 1 can be reduced, and the system stability and energy efficiency ratio can also be improved.

[0069] This application embodiment protects the compressor 1 by adding a gas-liquid separator 10, which can effectively extend the service life of the system.

[0070] According to one embodiment of this application, as shown in FIG1, the heat pump air conditioning system of this application further includes: a second sensor 11, a third sensor, a second valve 12, and a third throttling device 13.

[0071] The second sensor 11 is installed on the condenser 3 to detect the defrost temperature. This helps the system accurately determine when defrosting is needed to maintain stable operation of the system in winter heating mode.

[0072] The third sensor is used to detect the outdoor wet-bulb temperature, which is an important parameter reflecting the ambient humidity. By directly measuring the wet-bulb temperature, the frost situation can be judged more accurately, avoiding misjudgment and improving control precision.

[0073] The second valve 12 is connected to the exhaust port of the compressor 1 and is used to control the flow direction of the high-temperature and high-pressure refrigerant, so that part of the high-temperature and high-pressure refrigerant discharged from the compressor 1 can enter the condenser 3 for defrosting.

[0074] The third throttling device 13 is connected to the second valve 12 and the inlet of the condenser 3 respectively. It is used to regulate the refrigerant flow rate entering the condenser 3, ensure the refrigerant flow rate in the main circuit of the system, and prevent excessive refrigerant flow from entering the condenser 3, thereby ensuring stable system operation and increasing the refrigerant flow rate, thereby improving defrosting efficiency.

[0075] The controller is connected to the second sensor 11, the third sensor, and the second valve 12 respectively. When the heat pump air conditioning system is running in heating mode, it intelligently controls the opening and closing of the second valve 12 based on the detected defrost temperature and outdoor wet-bulb temperature to achieve precise defrost control.

[0076] When heating in winter, the system's workflow is mainly as follows:

[0077] The defrost temperature Te detected by the second sensor 11 and the outdoor wet-bulb temperature Tw detected by the third sensor are monitored in real time.

[0078] When Te ≤ Tw, it indicates that frosting has occurred. The controller opens the second valve 12, and the high-temperature, high-pressure refrigerant flows from the compressor 1 through the third throttling device 13 to regulate the flow rate and prevent insufficient refrigerant in the main circuit from causing unstable operation. At the same time, the flow rate is increased to accelerate defrosting. This regulated refrigerant enters the condenser 3, causing the condenser 3 to defrost rapidly.

[0079] When Te>Tw, it indicates that there is no frosting phenomenon. The controller closes the second valve 12 to ensure the refrigerant flow in the main circuit, thereby ensuring the stable operation of the system.

[0080] Through these improvements, the heat pump air conditioning system of this application can more accurately identify and handle frost problems, improving defrosting efficiency and system stability. Simultaneously, by directly detecting the outdoor ambient temperature and wet-bulb temperature, control accuracy can be effectively improved, reducing the possibility of misjudgment.

[0081] According to one embodiment of this application, the first valve 4 and the second valve 12 are solenoid valves, the first throttling device 5 and the second throttling device 9 are electronic expansion valves, and the third throttling device 13 is a capillary tube.

[0082] Specifically, both the first valve 4 and the second valve 12 are solenoid valves. The solenoid valves control the opening and closing of the valves via electrical signals, achieving rapid and precise control of the refrigerant flow. In this system, the first valve 4 is used to control the operating state of the economizer 6, while the second valve 12 is used to control the refrigerant flow direction during the defrosting process.

[0083] Both the first throttling device 5 and the second throttling device 9 are electronic expansion valves. An electronic expansion valve is a device that uses electronic control technology to regulate the flow and pressure of refrigerant. Compared to traditional thermostatic expansion valves, electronic expansion valves can respond more accurately and quickly to changes in the system, improving the system's energy efficiency ratio and stability.

[0084] The third throttling device 13 is a capillary tube. A capillary tube is a simple and low-cost throttling device that restricts refrigerant flow through its length and inner diameter, thereby reducing refrigerant pressure and temperature. In this system, the capillary tube is mainly used to further regulate the refrigerant flow rate and velocity entering the condenser, ensuring stable system operation during the defrosting process.

[0085] By using advanced control components such as solenoid valves and electronic expansion valves, the heat pump air conditioning system of this application can achieve more precise and faster control of refrigerant flow and pressure, thereby improving the system's energy efficiency ratio, stability, and comfort. Simultaneously, by combining it with simple throttling devices such as capillary tubes, cost and complexity can be reduced while ensuring system performance.

[0086] According to one embodiment of this application, as shown in FIG1, the first sensor and the third sensor are integrated into a single module as a sensing and detection module 14, which is installed on the outdoor unit where the condenser 3 is located.

[0087] The embodiments of this application utilize an integrated modular design to save installation space, resulting in a more compact device layout and a reduced overall device size. Furthermore, by integrating the first sensor (detecting outdoor ambient temperature) and the third sensor (detecting outdoor wet-bulb temperature) into the same module, the installation process is simplified, wiring and connection complexity is reduced, and installation efficiency is improved.

[0088] According to one embodiment of this application, as shown in FIG1, an indoor fan 15 is arranged side by side in the evaporator 2, and an outdoor fan 16 is arranged side by side in the condenser 3.

[0089] Specifically, the indoor fan 15 helps accelerate the flow of indoor air through the evaporator 2, enhancing heat exchange between the air and the refrigerant and improving the heat exchange effect. Simultaneously, the outdoor fan 16 accelerates the flow of outdoor air through the condenser 3, enhancing heat exchange between the air and the refrigerant and improving the heat exchange effect. Furthermore, by arranging the fans side-by-side, this application ensures more uniform airflow through the evaporator 2 or condenser 3, avoiding localized hot or cold spots and improving system comfort and stability.

[0090] By arranging an indoor fan 15 and an outdoor fan 16 side by side on the evaporator 2 and the condenser 3, the heat pump air conditioning system of this application can achieve more efficient and uniform heat exchange, thereby improving the system's energy efficiency ratio and comfort.

[0091] The economizer 6 and the regenerator 8 in this application can be plate heat exchangers, shell-and-tube heat exchangers, or other types of heat exchangers.

[0092] The control method of the heat pump air conditioning system provided in this application will be described below. The control method of the heat pump air conditioning system described below can be referred to in correspondence with the heat pump air conditioning system described above.

[0093] According to an embodiment of the second aspect of this application, referring to FIG2, this application also provides a control method for the heat pump air conditioning system of the above embodiment, which mainly includes the following steps.

[0094] S201. Obtain the operating mode and outdoor ambient temperature of the heat pump air conditioning system.

[0095] In this step, the system monitors the operating mode of the heat pump air conditioning system (such as cooling mode or heating mode) and the outdoor ambient temperature in real time through corresponding sensors and controllers. This data forms the basis for subsequent control decisions.

[0096] S202. Control the opening and closing of the first valve 4 according to the operating mode of the heat pump air conditioning system and the outdoor ambient temperature.

[0097] After obtaining the operating mode and outdoor ambient temperature, the controller will decide whether to open or close the first valve 4 according to the preset control strategy. The first valve 4 is mainly used to control the direction and flow rate of refrigerant to optimize the system's energy efficiency ratio and performance.

[0098] When the heat pump air conditioning system is running in cooling mode, if the outdoor ambient temperature is greater than or equal to the first set value, the first valve 4 is opened; if the outdoor ambient temperature is less than the first set value, the first valve 4 is closed.

[0099] When the heat pump air conditioning system is running in heating mode, if the outdoor ambient temperature is less than or equal to the second set value, the first valve 4 is opened; if the outdoor ambient temperature is greater than the second set value, the first valve 4 is closed.

[0100] Specifically, when the heat pump air conditioning system is operating in cooling mode, if the outdoor ambient temperature reaches or exceeds a preset first set value, the controller will determine that it may be necessary to improve the system's cooling efficiency. Therefore, the first valve 4 is opened, allowing the refrigerant to flow through the efficiency enhancement component path to optimize the cooling process and avoid unnecessary cooling loss. The specific process is described in the aforementioned system section and will not be repeated here.

[0101] When the outdoor ambient temperature is lower than the first set value, the controller determines that no additional cooling optimization measures may be needed. Therefore, it closes the first valve 4 to maintain the normal refrigerant flow path and system energy efficiency.

[0102] When the heat pump air conditioning system is operating in heating mode, if the outdoor ambient temperature reaches or falls below a preset second set value, the controller will determine that heating efficiency may need to be optimized. Therefore, it opens the first valve 4, allowing refrigerant to flow through the efficiency enhancement component path to optimize the cooling process and avoid unnecessary cooling loss. The specific process is described in the aforementioned system section and will not be repeated here.

[0103] When the outdoor ambient temperature exceeds the second set value, the controller determines that additional heating optimization measures may not be necessary. Therefore, it closes the first valve 4 to maintain the normal refrigerant flow path and system efficiency.

[0104] The control method for the heat pump air conditioning system provided in this application, through this control strategy based on outdoor ambient temperature and preset set values, can more accurately adapt to different environmental conditions and operating modes, thereby improving the system's energy efficiency ratio, stability, and comfort.

[0105] According to one embodiment of this application, as shown in FIG3, the control method of the heat pump air conditioning system of this application further includes the steps of...

[0106] S301. When the heat pump air conditioning system is running in heating mode, obtain the defrost temperature and the outdoor wet-bulb temperature.

[0107] In this step, the system obtains the defrost temperature through a second sensor 11 located on the condenser 3, and simultaneously obtains the outdoor wet-bulb temperature through a third sensor. These two parameters are crucial for determining whether the system needs to perform a defrost operation.

[0108] S302. Based on the defrost temperature and the outdoor wet-bulb temperature, control the opening and closing of the second valve 12 between the discharge port of compressor 1 and the inlet of condenser 3.

[0109] In this step, the controller will determine whether to open or close the second valve 12 based on the obtained defrost temperature and outdoor wet-bulb temperature: if the defrost temperature is less than or equal to the outdoor wet-bulb temperature, the second valve 12 will be opened; if the defrost temperature is greater than the outdoor wet-bulb temperature, the second valve 12 will be closed.

[0110] Specifically, when the defrost temperature is detected to be lower than or equal to the outdoor wet-bulb temperature, it indicates that frost may be forming in the system. To initiate the defrost operation, the controller opens the second valve 12. This allows the high-temperature, high-pressure refrigerant to quickly enter the condenser 3 from the compressor 1's discharge port after its flow rate is regulated by the third throttling device 13, thus rapidly defrosting.

[0111] When the detected defrost temperature is higher than the outdoor wet-bulb temperature, it indicates that the system currently has no frosting issues. To maintain normal heating operation, the controller closes the second valve 12 to avoid unnecessary energy loss and system complexity.

[0112] This application embodiment, through this intelligent control method based on defrost temperature and outdoor wet-bulb temperature, can more accurately judge and handle frost problems in heating mode, thereby improving the system's stability and energy efficiency ratio.

[0113] In summary, the heat pump air conditioning system and control method provided in this application can ensure that the system can work well in both high-temperature cooling in summer and low-temperature heating in winter, while significantly improving the system's energy efficiency, and enabling rapid defrosting and stable operation, thereby improving the user experience.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A heat pump air conditioning system, comprising: The first sensor is used to detect the outdoor ambient temperature; A compressor, evaporator, and condenser connected in a cycle; The efficiency-enhancing component includes a first valve, a first throttling device, and an economizer connected in sequence. The first valve is connected to the condenser. The first heat exchange flow path of the economizer is connected between the evaporator and the condenser. The second heat exchange flow path of the economizer is connected to the first throttling device and the gas injection port of the compressor, respectively. The controller is connected to the compressor, the first sensor, and the first valve respectively, and is used to control the opening and closing of the first valve according to the operating mode of the heat pump air conditioning system and the detected outdoor ambient temperature.

2. The heat pump air conditioning system according to claim 1 further includes: A four-way valve is connected to the controller, with its first end connected to the exhaust port of the compressor, its second end connected to the evaporator, its third end connected to the condenser, and its fourth end connected to the suction port of the compressor.

3. The heat pump air conditioning system according to claim 2, wherein, The efficiency-enhancing components also include: The regenerator has a third heat exchange path connected between the evaporator and the first heat exchange path of the economizer, and a fourth heat exchange path connected between the fourth end of the four-way valve and the suction port of the compressor.

4. The heat pump air conditioning system according to claim 3, wherein, The third heat exchange path of the regenerator is connected to the first heat exchange path of the economizer via the second throttling device.

5. The heat pump air conditioning system according to claim 3, wherein, The fourth heat exchange path of the regenerator is connected to the suction port of the compressor via a gas-liquid separator.

6. The heat pump air conditioning system according to any one of claims 1-5, further comprising: The second sensor is installed on the condenser to detect the defrost temperature; The third sensor is used to detect the outdoor wet-bulb temperature. The second valve is connected to the exhaust port of the compressor; The third throttling device is connected to the second valve and the inlet of the condenser, respectively; The controller is connected to the second sensor, the third sensor and the second valve respectively, and is used to control the opening and closing of the second valve according to the detected defrost temperature and the outdoor wet-bulb temperature when the heat pump air conditioning system is running in heating mode.

7. A control method for a heat pump air conditioning system according to any one of claims 1-6, comprising: Obtain the operating mode and outdoor ambient temperature of the heat pump air conditioning system; The opening and closing of the first valve is controlled according to the operating mode of the heat pump air conditioning system and the outdoor ambient temperature.

8. The control method for a heat pump air conditioning system according to claim 7, wherein, The step of controlling the opening and closing of the first valve according to the operating mode of the heat pump air conditioning system and the outdoor ambient temperature includes: When the heat pump air conditioning system is running in cooling mode, if the outdoor ambient temperature is determined to be greater than or equal to a first set value, the first valve is controlled to open; if the outdoor ambient temperature is determined to be less than the first set value, the first valve is controlled to close. When the heat pump air conditioning system is operating in heating mode, if the outdoor ambient temperature is determined to be less than or equal to a second set value, the first valve is controlled to open; if the outdoor ambient temperature is determined to be greater than the second set value, the first valve is controlled to close.

9. The control method for the heat pump air conditioning system according to claim 8 further includes: When the heat pump air conditioning system is operating in heating mode, the defrost temperature and the outdoor wet-bulb temperature are obtained; The opening and closing of the second valve between the compressor's exhaust port and the condenser's inlet is controlled based on the defrost temperature and the outdoor wet-bulb temperature.

10. The control method for a heat pump air conditioning system according to claim 9, wherein, The step of controlling the opening and closing of the second valve between the compressor's discharge port and the condenser's inlet based on the defrost temperature and the outdoor wet-bulb temperature includes: If the defrost temperature is determined to be less than or equal to the outdoor wet-bulb temperature, the second valve is controlled to open. If the defrosting temperature is determined to be greater than the outdoor wet-bulb temperature, the second valve is controlled to close.

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