An air source heat pump air conditioning system control method, device, apparatus and medium

Abstract

The application discloses an air source heat pump air conditioning system control method, equipment, device and storage medium, wherein the method comprises the following steps: obtaining the return air temperature, the coil inlet temperature and the liquid accumulation temperature of the air source heat pump air conditioning system; determining the system return air superheat degree according to the return air temperature and the coil inlet temperature; and adjusting the first ball valve and / or the second ball valve of the return air branch according to the system return air superheat degree and the liquid accumulation temperature. The method adjusts the refrigerant flow of the return air branch by controlling the ball valve opening degree, thereby controlling the liquid phase refrigerant proportion entering the gas-liquid separator, effectively reducing the accumulation of a large amount of liquid phase refrigerant in the gas-liquid separator, utilizing the heat generated by the reactor, improving the refrigerant circulation amount of the system, reducing the system liquid return risk at low ambient temperature, and improving the stability of the air source heat pump air conditioning system. The application can be widely applied to the technical field of air conditioner control.

Description

Technical Field

[0001] This application relates to the field of air conditioning control technology, and in particular to a control method, equipment, device and storage medium for an air source heat pump air conditioning system. Background Technology

[0002] Traditional heat pump air conditioners, operating under ultra-low ambient temperatures, suffer from incomplete refrigerant evaporation in the finned heat exchanger. This results in a large amount of refrigerant accumulating in the liquid phase in the system's gas-liquid separator, posing a risk of liquid return to the heat pump unit and reducing the stability of the air-source heat pump air conditioning system. Therefore, there are still technical problems that need to be solved in this field. Summary of the Invention

[0003] The purpose of this application is to at least partially solve one of the technical problems existing in the prior art.

[0004] Therefore, one objective of this application is to provide a control method, device, apparatus, and storage medium for an air source heat pump air conditioning system. This solution can reduce the risk of liquid return in the heat pump unit and improve the stability of the air source heat pump air conditioning system.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted in the embodiments of this application includes: a control method for an air source heat pump air conditioning system, comprising: acquiring the return air temperature, coil inlet temperature, and liquid accumulation temperature of the air source heat pump air conditioning system; determining the system return air superheat based on the return air temperature and the coil inlet temperature; and adjusting the first ball valve and / or the second ball valve of the return air branch based on the system return air superheat and the liquid accumulation temperature.

[0006] In addition, the method for controlling an air source heat pump air conditioning system according to the above embodiments of the present invention may also have the following additional technical features:

[0007] Further, in this embodiment of the application, adjusting the first ball valve and the second ball valve of the air source heat pump air conditioning system according to the system return gas superheat and the accumulated liquid temperature includes:

[0008] In heating mode, when the ambient temperature of the air source heat pump air conditioning system is lower than the first preset temperature, and the superheat of the system return air is less than or equal to the first set value, and the liquid temperature is less than the second set value, the first ball valve is adjusted to open at the first preset opening degree.

[0009] In the heating mode, after the first ball valve is opened at the first preset opening degree, when the ambient temperature is lower than the first preset temperature, the system return air superheat is less than or equal to a third set value, and the liquid temperature is less than or equal to the second set value and is maintained for more than a first time threshold, the first ball valve is adjusted from the first preset opening degree to a second preset opening degree.

[0010] Further, in the embodiments of the present application, the first preset opening degree and the second preset opening degree satisfy the following formula:

[0011] K1 = K2 + P1

[0012] Wherein K2 is the first preset opening degree, K1 is the second preset opening degree, and P1 is a preset constant.

[0013] Further, in the embodiments of the present application, the adjusting the first ball valve and the second ball valve of the air source heat pump air conditioning system according to the system return air superheat and the liquid temperature further comprises:

[0014] In the cooling mode, the first ball valve and the second ball valve are closed, and the electronic expansion valve is controlled to operate through a PID algorithm.

[0015] Further, in the embodiments of the present application, the adjusting the first ball valve and the second ball valve of the air source heat pump air conditioning system according to the system return air superheat and the liquid temperature further comprises:

[0016] In the defrosting mode, the first ball valve and the second ball valve are closed, and the electronic expansion valve is controlled to operate at a third preset opening degree.

[0017] Further, in the embodiments of the present application, the adjusting the first ball valve and the second ball valve of the air source heat pump air conditioning system according to the system return air superheat and the liquid temperature further comprises:

[0018] In the heating mode, when the ambient temperature of the air source heat pump air conditioning system is lower than a first preset temperature, the system return air superheat is less than or equal to a first set value, and the liquid temperature is less than a second set value, the second ball valve is adjusted to be opened at a fourth preset opening degree.

[0019] In the heating mode, after the first ball valve is opened at the first preset opening degree, when the ambient temperature is lower than the first preset temperature, the system return air superheat is less than or equal to a third set value, and the liquid temperature is less than or equal to the second set value and is maintained for more than a first time threshold, the second ball valve is controlled to maintain the fourth preset opening degree.

[0020] Further, in the embodiments of the present application, the determining the system back gas superheat degree according to the back gas temperature and the coil inlet temperature comprises: obtaining a first difference by subtracting the coil inlet temperature from the back gas temperature; and taking the first difference as the system back gas superheat degree.

[0021] In another aspect, the embodiments of the present application also provide an air source heat pump air conditioning system control device, comprising:

[0022] an obtaining unit configured to obtain a back gas temperature, a coil inlet temperature and a liquid accumulation temperature of an air source heat pump air conditioning system;

[0023] a first processing unit configured to determine a system back gas superheat degree according to the back gas temperature and the coil inlet temperature;

[0024] a second processing unit configured to adjust a first ball valve and / or a second ball valve of the air source heat pump air conditioning system according to the system back gas superheat degree and the liquid accumulation temperature.

[0025] In another aspect, the embodiments of the present application also provide an air source heat pump air conditioning system control device, comprising:

[0026] at least one processor;

[0027] at least one memory configured to store at least one program;

[0028] when the at least one program is executed by the at least one processor, the at least one processor is caused to implement the air source heat pump air conditioning system control method according to any one of the summary.

[0029] In addition, the present application also provides a computer readable storage medium, wherein the computer readable storage medium stores processor executable instructions, and the processor executable instructions are used to execute the air source heat pump air conditioning system control method according to any one of the above when executed by a processor.

[0030] The advantages and beneficial effects of the present application will be partially given in the following description, partially will become obvious from the following description, or will be known by the practice of the present application:

[0031] The application can obtain the return air temperature, the coil inlet temperature and the liquid accumulation temperature of the air source heat pump air conditioning system; determine the system return air superheat degree according to the return air temperature and the coil inlet temperature; and adjust the first ball valve and / or the second ball valve of the return air branch according to the system return air superheat degree and the liquid accumulation temperature. The application adjusts the refrigerant flow of the return air branch by controlling the ball valve opening degree, thereby controlling the proportion of the liquid phase refrigerant entering the gas-liquid separator, effectively reducing the accumulation of a large amount of liquid phase refrigerant in the gas-liquid separator, utilizing the heat generated by the reactor, improving the refrigerant circulation amount of the system, and reducing the risk of system liquid return at low ambient temperature, thereby improving the stability of the air source heat pump air conditioning system. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 A step schematic diagram of an air source heat pump air conditioning system control method in one specific embodiment in the application;

[0033] Figure 2 A structure schematic diagram of an air source heat pump air conditioning system in one specific embodiment in the application;

[0034] Figure 3 A structure schematic diagram of an air source heat pump air conditioning system in a heating mode in one specific embodiment in the application;

[0035] Figure 4 A structure schematic diagram of an air source heat pump air conditioning system in a refrigeration mode in one specific embodiment in the application;

[0036] Figure 5 A structure schematic diagram of an air source heat pump air conditioning system in a defrosting mode in one specific embodiment in the application;

[0037] Figure 6 A structure schematic diagram of an air source heat pump air conditioning system control device in one specific embodiment in the application;

[0038] Figure 7 A structure schematic diagram of an air source heat pump air conditioning system control device in one specific embodiment in the application. DETAILED DESCRIPTION

[0039] The principles and processes of the air source heat pump air conditioning system control method, device, apparatus and storage medium in the embodiments of the application are described in detail below in combination with the drawings.

[0040] First, the technical terms mentioned in the application are described.

[0041] PID algorithm: the PID control algorithm combines three control links of proportion, integral and differential, and adjusts the control output through the combination of the three links, so that the actual output value of the system is as close as possible to the expected reference value.

[0042] Proportional control: The output of the proportional controller is directly proportional to the input error, which can quickly reflect the error and reduce the error, but cannot eliminate the static error (the difference between the given value and the measured value of the output when the system control process tends to be stable). The larger the proportional coefficient, the stronger the control effect and the faster the system response, but it may cause the system to produce larger overshoot and oscillation, and reduce the stability performance.

[0043] Integral control: Integral control is mainly used to eliminate static error and improve the system's error-free degree. The strength of integral action depends on the integral time constant Ti, the smaller Ti, the faster the integral speed and the stronger the integral action. The existence of integral control is related to the existence time of error e(t), as long as the system has error, the integral element will continue to act, integrating the input error, so that the output of the controller and the opening of the actuator change continuously to reduce the error. However, the introduction of integral control can eliminate static error, but it will reduce the response speed of the system, especially for the controlled object with large inertia, which may cause the system to produce larger overshoot and oscillation.

[0044] Derivative control: Derivative control is based on the rate of change of error to predict future error and adjust the control output accordingly. Derivative control helps to speed up the response of the system, reduce overshoot, and increase the stability of the system. Derivative control is very sensitive to noise, because noise usually causes sudden changes in error, which may be mistaken for the rate of change of error. If the derivative time constant is too large, the system will be unstable.

[0045] Secondly, referring to Figure 1 , Figure 1 is a step schematic diagram of an air source heat pump air conditioning system control method provided by the embodiment of the application. In Figure 1 , the air source heat pump air conditioning system control method can include but is not limited to steps S101-S103.

[0046] S101, obtaining the return air temperature, the coil inlet temperature and the liquid accumulation temperature of the air source heat pump air conditioning system.

[0047] In some feasible embodiments of the application, the processor or other chip with data processing function can be connected with the sensor in wired or wireless manner. The processor can receive the return air temperature, the coil inlet temperature and the liquid accumulation temperature of the air source heat pump air conditioning system measured by the sensor. Specifically, referring to Figure 2 , some sensors can be deployed outside the gas-liquid separator shell, which can detect the liquid accumulation temperature. Some sensors can be deployed between the gas-liquid separator outlet and the compressor suction port, which can detect the return air temperature. Some sensors can be deployed on the fin capillary transition pipe, which can detect the coil temperature. Some sensors can be deployed outside the unit, which can detect the ambient temperature.

[0048] It should be noted that the above wired connection mode can include the connection between the mobile device and the processing module, and can also include the connection between the processing module and the hardware device and other now known or future developed devices and the processing module; and the above wireless connection mode can include but is not limited to 3G / 4G / 5G connection, WiFi connection, Bluetooth connection, WiMAX connection, Zigbee connection, UWB (Ultra Wide Band) connection and other now known or future developed wireless connection modes.

[0049] S102, determining the system back gas superheat degree according to the back gas temperature and the coil inlet temperature.

[0050] In some embodiments of the present application, the processor can determine the system back gas superheat degree according to the back gas temperature and the coil inlet temperature. The system back gas superheat degree is an intermediate parameter, which can be used for subsequent ball valve control.

[0051] S103, adjusting the first ball valve and / or the second ball valve of the back gas branch according to the system back gas superheat degree and the liquid accumulation temperature.

[0052] It can be understood that, with reference to Figure 2 , the back gas branch can be a branch composed of a three-way valve, a first ball valve A, a reactor fluorine cooling heat sink, a second ball valve B, a gas-liquid separator and a pipeline connected between each other.

[0053] In some feasible embodiments of the present application, the processor can adjust the first ball valve and the second ball valve of the back gas branch according to the system back gas superheat degree and the liquid accumulation temperature. In some embodiments, the processor can adjust the first ball valve of the back gas branch according to the system back gas superheat degree and the liquid accumulation temperature. In some embodiments, the processor can adjust the second ball valve of the back gas branch according to the system back gas superheat degree and the liquid accumulation temperature.

[0054] Further, in the embodiments of the present application, the step of adjusting the first ball valve and the second ball valve of the air source heat pump air conditioning system according to the system back gas superheat degree and the liquid accumulation temperature can include steps S201-S202.

[0055] S201, in the heating mode, when the ambient temperature where the air source heat pump air conditioning system is located is lower than a first preset temperature, and the system back gas superheat degree is less than or equal to a first set value, and the liquid accumulation temperature is less than a second set value, the first ball valve is adjusted to be opened at a first preset opening degree.

[0056] S202, in the heating mode, after the first ball valve is opened at the first preset opening degree, when the ambient temperature is lower than the first preset temperature, the system back gas superheat degree is less than or equal to the third set value, the liquid accumulation temperature is less than or equal to the second set value and the holding time is greater than the first time threshold, the first ball valve is adjusted from the first preset opening degree to the second preset opening degree.

[0057] Further, in the embodiment of the application, the first preset opening degree and the second preset opening degree satisfy the following formula:

[0058] K1=K2+P1

[0059] Wherein, K2 is the first preset opening degree, K1 is the second preset opening degree, and P1 is a preset constant.

[0060] Further, in the embodiment of the application, the step of adjusting the first ball valve and the second ball valve of the air source heat pump air conditioning system according to the system back gas superheat degree and the liquid accumulation temperature can further include step S203.

[0061] S203, in the cooling mode, the first ball valve and the second ball valve are closed, and the electronic expansion valve is controlled to operate through the PID algorithm.

[0062] Further, in the embodiment of the application, the step of adjusting the first ball valve and the second ball valve of the air source heat pump air conditioning system according to the system back gas superheat degree and the liquid accumulation temperature can further include step S204.

[0063] S204, in the defrosting mode, the first ball valve and the second ball valve are closed, and the electronic expansion valve is controlled to operate at the third preset opening degree.

[0064] Further, in the embodiment of the application, the step of adjusting the first ball valve and the second ball valve of the air source heat pump air conditioning system according to the system back gas superheat degree and the liquid accumulation temperature can further include step S205 and step S206.

[0065] S205, in the heating mode, when the ambient temperature of the air source heat pump air conditioning system is lower than the first preset temperature, the system back gas superheat degree is less than or equal to the first set value, and the liquid accumulation temperature is less than the second set value, the second ball valve is adjusted to open at the fourth preset opening degree.

[0066] S206, in the heating mode, after the first ball valve is opened at the first preset opening degree, when the ambient temperature is lower than the first preset temperature, the system back gas superheat degree is less than or equal to the third set value, and the liquid accumulation temperature is less than or equal to the second set value and the holding time is greater than the first time threshold, the second ball valve is controlled to operate at the fourth preset opening degree.

[0067] It can be understood that the fourth preset opening degree can be the same as the fifth preset opening degree. Specifically, the fourth preset opening degree and the fifth preset opening degree can both be 100%. The first preset opening degree can be the smallest opening degree of the ball valve, and the second preset opening degree can be greater than the first preset opening degree. The third preset opening degree can be an arbitrary value set by a user.

[0068] Further, in the embodiments of the present application, the step of determining the system back gas superheat degree according to the back gas temperature and the coil inlet temperature can include steps S301-S302.

[0069] The back gas temperature and the coil inlet temperature are subtracted to obtain a first difference.

[0070] The first difference is taken as the system back gas superheat degree.

[0071] The specific implementation principles of the present application will be described below with reference to the accompanying drawings:

[0072] Referring to Figure 2 The back gas branch of the present embodiment can be a branch composed of a three-way valve, a first ball valve A, a reactor fluorine-cooled heat sink, a second ball valve B, a gas-liquid separator, and a pipeline connected between each of them. The system design of the present embodiment adjusts the refrigerant flow of the back gas branch by controlling the opening degree of the ball valve, thereby controlling the proportion of liquid-phase refrigerant entering the gas-liquid separator, effectively reducing the accumulation of a large amount of liquid-phase refrigerant in the gas-liquid separator, utilizing the heat generated by the reactor in operation, and improving the refrigerant circulation amount of the system, thereby achieving the purpose of reducing the risk of system back liquid and improving the capacity of the heat pump unit at low ambient temperature or even ultra-low ambient temperature.

[0073] A sensor outside the gas-liquid separator shell detects the liquid accumulation temperature. A sensor between the gas-liquid separator outlet and the compressor suction port detects the back gas temperature; a sensor of the fin capillary transition pipe detects the coil temperature; and a sensor outside the unit detects the ambient temperature. The following analysis is based on different modes of different heat pump air conditioners.

[0074] Ambient temperature ≤2℃ ≤-7℃ ≤-12℃ ≤-17℃ ≤-22℃ Ball valve A opening 15％ 30％ Control logic Control logic Control logic Ball valve B opening 100％ 100％ 100％ 100％ 100％

[0075] Table 1

[0076] The control in the heating mode refers to Table 1 and Figure 3 The controller can control the refrigerant flow of the heat supplement branch by adjusting the opening degrees of the ball valves A and B. When the ambient temperature is ≤-17℃, the opening degree of the ball valve A is adjusted according to the difference between the target heat supplement superheat degree and the system heat supplement superheat degree. The system heat supplement superheat degree = heat supplement outlet temperature - heat supplement inlet temperature, the system back gas superheat degree = back gas temperature - coil inlet temperature, and when the ambient temperature is ≤-12℃, the unit executes the following control logic.

[0077] The first opening condition of the ball valve A is that the return gas superheat is less than or equal to a set value t1, the liquid temperature is less than or equal to a set value t2, and the holding time is greater than or equal to T1, the ball valve A is kept open at a minimum opening, and the ball valve B opening is kept at 100% during the process; the electronic expansion valve opening is adjusted according to the normal logic.

[0078] When the ball valve A is opened at the minimum opening, the return gas superheat is less than or equal to a set value t2, the liquid temperature is less than or equal to a set value t2, and the holding time is greater than or equal to T2, the ball valve A opening is equal to the minimum opening plus P1 step, and then the PID adjustment is performed according to the difference between the target superheat and the system superheat, and the ball valve B opening is kept at 100% during the process. The electronic expansion valve opening is adjusted according to the normal logic. Wherein, P1 step is a preset opening parameter.

[0079] T1, T2 take the value range of 1-7 min; t1, t2 take the value range of 0-15℃, and P1 takes the value range of 5-100%.

[0080] Ambient temperature / Ball valve A opening 0％ Ball valve B opening 0％

[0081] Table 2

[0082] The control in the refrigeration mode refers to Table 2 and Figure 4 In the refrigeration mode, the ball valve A and the ball valve B are both kept closed. The electronic expansion valve opening is adjusted according to the normal logic.

[0083] Ambient temperature / Ball valve A opening 0％ Ball valve B opening 0％

[0084] Table 3

[0085] The control in the defrosting mode refers to Table 3 and Figure 5 In the defrosting mode, the ball valve A and the ball valve B are both closed, the electronic expansion valve opening is not adjusted, and is fixedly operated at a preset defrosting opening P2 until the defrosting is completed, and the normal logic is restored for adjustment.

[0086] In summary, the air source heat pump air conditioning system control method has the following advantages:

[0087] 1. In the heating mode, the application can utilize the heat generated by the reactor to prevent liquid refrigerant from entering the compressor to cause compressor liquid knock.

[0088] 2. In the heating mode, the application can adjust the opening of the ball valve to improve the refrigerant circulation amount at ultra-low ambient temperature, thereby improving the unit capacity.

[0089] In addition, referring to Figure 6 , and Figure 1The method corresponds to the method, and the embodiment of the application further provides an air source heat pump air conditioning system control device. The device can include an acquisition unit 1001, a first processing unit 1002, and a second processing unit 1003. The acquisition unit 1001 can be used to acquire the return air temperature, the coil inlet temperature, and the liquid accumulation temperature of the air source heat pump air conditioning system. The first processing unit 1002 can be used to determine the system return air superheat degree according to the return air temperature and the coil inlet temperature. The second processing unit 1003 can be used to adjust the first ball valve and / or the second ball valve of the air source heat pump air conditioning system according to the system return air superheat degree and the liquid accumulation temperature.

[0090] It should be noted that the acquisition unit can be any integrated circuit unit or microprocessor unit obtained by integrating a processing function chip and its peripheral circuit through existing integrated technology. The first processing unit and the second processing unit can also be any integrated circuit module or microprocessor module obtained by integrating a processing function chip and its peripheral circuit through existing integrated technology. The first processing unit and the second processing unit can further include one or more memories. The one or more memories can be used to store the specific algorithm for compression adjustment processing in the application.

[0091] In some embodiments of the application, the acquisition unit 1001 and the first processing unit 1002 can be disposed in the same gateway or device with a processor. The specific device connection mode and device arrangement of the acquisition unit 1001, the first processing unit 1002, and the first processing unit 1002 and the second processing unit 1003 are not limited.

[0092] It should be noted that the above-mentioned contents of the air source heat pump air conditioning system control method embodiment are applicable to the air source heat pump air conditioning system control device embodiment, the functions realized by the air source heat pump air conditioning system control device embodiment are the same as those of the air source heat pump air conditioning system control method embodiment, and the beneficial effects achieved by the air source heat pump air conditioning system control device embodiment are also the same as those achieved by the air source heat pump air conditioning system control method embodiment.

[0093] Corresponding to the method, Figure 1 The embodiment of the application further provides an air source heat pump air conditioning system control device, and the specific structure can refer to the air source heat pump air conditioning system control method Figure 7 , comprising:

[0094] at least one processor 1011;

[0095] at least one memory 1012 for storing at least one program;

[0096] When the at least one program is executed by the at least one processor, the at least one processor implements the air source heat pump air conditioning system control method.

[0097] The contents in the method embodiments are applicable to the device embodiments, the device embodiments specifically implement the same functions as the method embodiments, and achieve the same beneficial effects as the method embodiments.

[0098] Corresponding to the method of Figure 1 Corresponding to the method of

[0099] The contents in the air source heat pump air conditioning system control method embodiments are applicable to the storage medium embodiments, the storage medium embodiments specifically implement the same functions as the air source heat pump air conditioning system control method embodiments, and achieve the same beneficial effects as the air source heat pump air conditioning system control method embodiments.

[0100] In some alternative embodiments, the functions / operations mentioned in the block diagrams can not occur in the order mentioned in the operation diagrams. For example, depending on the functions / operations involved, two blocks shown in succession can actually be executed substantially concurrently or the blocks can sometimes be executed in reverse order. Furthermore, the embodiments presented and described in the flow diagrams are only examples. The disclosed methods are not limited to the operations and logical flows presented in the specification. Alternative embodiments are contemplated, in which the order of various operations is changed and in which sub-operations described as part of a larger operation are executed independently.

[0101] Furthermore, although the present application is described in the context of functional modules, it is to be understood that one or more of the functions and / or features can be integrated in a single physical device and / or software module, or one or more functions and / or features can be implemented in separate physical devices or software modules. It is also to be understood that detailed discussion of the actual implementation of each module is unnecessary to an understanding of the present application. Rather, the actual implementation is within the routine of an engineer's knowledge given the nature of the functional modules, their properties, and their interrelationships as disclosed in the specification. Therefore, the present application is not limited to the embodiments disclosed herein, but rather, the scope of the present application is to be determined by the claims and their equivalents. It is also to be understood that the particular concepts disclosed are illustrative only and not restrictive of the scope of the present application, which is to be determined by the appended claims and their equivalents.

[0102] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the parts of the prior art that make contributions or parts of the technical solutions can be embodied in the form of a software product, which is stored in a storage medium and includes several programs 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 described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0103] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a list of ordered steps for implementing logical functions, which can be embodied in any computer readable medium for use by a program execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can take programs from a program execution system, device or apparatus and execute them) or in conjunction with these program execution systems, devices or apparatus. For the purpose of this specification, "computer readable medium" can be any device that can contain, store, communicate, propagate or transport programs for use by program execution systems, devices or apparatus or in conjunction with these program execution systems, devices or apparatus.

[0104] More specific examples (non-exhaustive list) of computer readable medium include the following: an electrical connection having one or more wires (electrical devices), a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium can even be paper or other suitable medium on which the program can be printed, because the program can be obtained electronically, for example, by optical scanning of the paper or other medium, followed by editing, interpreting or otherwise processing, if necessary, in other suitable ways, to be stored in a computer memory.

[0105] It should be understood that various parts of the present application can be implemented in hardware, software, firmware or a combination thereof. In the above embodiments, various steps or methods can be implemented in software or firmware that is stored in memory and executed by a suitable

[0106] In the above description of the present specification, the description referring to the terms "one embodiment", "another embodiment" or "certain embodiments" or the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples.

[0107] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, alternatives and variations can be made thereto without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

[0108] The above is a specific description of the preferred embodiments of the present application, but the present application is not limited to the described embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are included in the scope defined by the claims of the present application.

Claims

1. A control method for an air source heat pump air conditioning system, characterized in that, The air source heat pump air conditioning system includes a finned heat exchanger, a four-way valve, a shell-and-tube heat exchanger, a filter, a compressor, and a return gas branch. The return gas branch includes a three-way valve, a first ball valve, a reactor refrigerant cooling plate, a second ball valve, and a gas-liquid separator. The finned heat exchanger is connected to the first end of the four-way valve, the second end of the four-way valve is connected to the first end of the three-way valve, the third end of the four-way valve is connected to the shell-and-tube heat exchanger, and the fourth end of the four-way valve is connected to the compressor. The shell-and-tube heat exchanger is connected to the finned heat exchanger through the filter. The second end of the three-way valve is connected to the reactor refrigerant cooling plate through the first ball valve. The reactor refrigerant cooling plate is connected to the gas-liquid separator through the second ball valve. The gas-liquid separator is also connected to the third end of the three-way valve and the compressor. The control method includes the following steps: To obtain the return air temperature, coil inlet temperature, and liquid accumulation temperature of the air source heat pump air conditioning system; The system return gas superheat is determined based on the return gas temperature and the coil inlet temperature. Adjust the first ball valve and the second ball valve of the return gas branch according to the system return gas superheat and the liquid temperature; The step of adjusting the first ball valve and the second ball valve of the air source heat pump air conditioning system according to the system return gas superheat and the accumulated liquid temperature includes: In heating mode, when the ambient temperature of the air source heat pump air conditioning system is lower than the first preset temperature, and the superheat of the system return air is less than or equal to the first set value, and the liquid temperature is less than the second set value, the first ball valve is adjusted to open at the first preset opening degree. In heating mode, after the first ball valve is opened at the first preset opening degree, when the ambient temperature is lower than the first preset temperature, and the system return gas superheat is less than or equal to the third set value and the liquid temperature is less than or equal to the second set value and the time is greater than the first time threshold, the first ball valve is adjusted from the first preset opening degree to the second preset opening degree. The first preset opening and the second preset opening satisfy the following formula: K1 = K2 + P1 Where K2 is the first preset opening degree, K1 is the second preset opening degree, and P1 is a preset constant.

2. The control method for an air source heat pump air conditioning system according to claim 1, characterized in that, The step of adjusting the first ball valve and the second ball valve of the air source heat pump air conditioning system according to the system return gas superheat and the accumulated liquid temperature further includes: In cooling mode, the first ball valve and the second ball valve are closed, and the electronic expansion valve is controlled by a PID algorithm.

3. The control method for an air source heat pump air conditioning system according to claim 1, characterized in that, The step of adjusting the first ball valve and the second ball valve of the air source heat pump air conditioning system according to the system return gas superheat and the accumulated liquid temperature further includes: In defrost mode, the first ball valve and the second ball valve are closed, and the electronic expansion valve is controlled to operate at a third preset opening.

4. The control method for an air source heat pump air conditioning system according to claim 1, characterized in that, The step of adjusting the first ball valve and the second ball valve of the air source heat pump air conditioning system according to the system return gas superheat and the accumulated liquid temperature further includes: In heating mode, when the ambient temperature of the air source heat pump air conditioning system is lower than the first preset temperature, and the superheat of the system return air is less than or equal to the first set value, and the liquid temperature is less than the second set value, the second ball valve is adjusted to open at the fourth preset opening degree. In heating mode, after the first ball valve is opened at the first preset opening degree, when the ambient temperature is lower than the first preset temperature, and the system return gas superheat is less than or equal to the third set value and the liquid temperature is less than or equal to the second set value and the time is greater than the first time threshold, the second ball valve is controlled to maintain the fourth preset opening degree.

5. The control method for an air source heat pump air conditioning system according to claim 1, characterized in that, The step of determining the system return gas superheat based on the return gas temperature and the coil inlet temperature includes: The difference between the return gas temperature and the coil inlet temperature is used to obtain the first difference; The first difference is taken as the system return gas superheat.

6. A control device for an air source heat pump air conditioning system, characterized in that, The air source heat pump air conditioning system includes a finned heat exchanger, a four-way valve, a shell-and-tube heat exchanger, a filter, a compressor, and a return gas branch. The return gas branch includes a three-way valve, a first ball valve, a reactor refrigerant cooling plate, a second ball valve, and a gas-liquid separator. The finned heat exchanger is connected to the first end of the four-way valve, the second end of the four-way valve is connected to the first end of the three-way valve, the third end of the four-way valve is connected to the shell-and-tube heat exchanger, and the fourth end of the four-way valve is connected to the compressor. The shell-and-tube heat exchanger is connected to the finned heat exchanger through the filter. The second end of the three-way valve is connected to the reactor refrigerant cooling plate through the first ball valve. The reactor refrigerant cooling plate is connected to the gas-liquid separator through the second ball valve. The gas-liquid separator is also connected to the third end of the three-way valve and the compressor. The control equipment includes: The acquisition unit is used to acquire the return air temperature, coil inlet temperature and liquid accumulation temperature of the air source heat pump air conditioning system. The first processing unit is used to determine the system return gas superheat based on the return gas temperature and the coil inlet temperature. The second processing unit is used to adjust the first ball valve and the second ball valve of the air source heat pump air conditioning system according to the system return gas superheat and the liquid temperature. The step of adjusting the first ball valve and the second ball valve of the air source heat pump air conditioning system according to the system return gas superheat and the accumulated liquid temperature includes: In heating mode, when the ambient temperature of the air source heat pump air conditioning system is lower than the first preset temperature, and the superheat of the system return air is less than or equal to the first set value, and the liquid temperature is less than the second set value, the first ball valve is adjusted to open at the first preset opening degree. In heating mode, after the first ball valve is opened at the first preset opening degree, when the ambient temperature is lower than the first preset temperature, and the system return gas superheat is less than or equal to the third set value and the liquid temperature is less than or equal to the second set value and the time is greater than the first time threshold, the first ball valve is adjusted from the first preset opening degree to the second preset opening degree. The first preset opening and the second preset opening satisfy the following formula: K1 = K2 + P1 Where K2 is the first preset opening degree, K1 is the second preset opening degree, and P1 is a preset constant.

7. A control device for an air source heat pump air conditioning system, characterized in that... include: At least one processor; At least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the air source heat pump air conditioning system control method as described in any one of claims 1-5.

8. A computer-readable storage medium storing processor-executable instructions, characterized in that, The instructions executable by the processor are used, when executed by the processor, to perform the air source heat pump air conditioning system control method as described in any one of claims 1-5.

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