Air source heat pump air conditioning system control method, equipment, device and medium

Abstract

The invention discloses an air source heat pump air conditioning system control method, equipment, a device and a storage medium. The method comprises the following steps that the air return temperature, the coil pipe inlet temperature and the accumulated liquid temperature of an air source heat pump air conditioning system are obtained; the system return air superheat degree is determined according to the return air temperature and the coil inlet temperature; and according to the system return air superheat degree and the accumulated liquid temperature, a first ball valve and / or a second ball valve of the return air branch are / is adjusted. According to the method, the proportion of the liquid-phase refrigerant entering the gas-liquid separator is controlled by controlling the opening degree of the ball valve and adjusting the refrigerant flow of the gas return branch, accumulation of a large amount of liquid-phase refrigerant in the gas-liquid separator is effectively reduced, heat generated by operation of the electric reactor is utilized, the refrigerant circulation amount of the system is increased, the liquid return risk of the system is reduced at the low environment temperature, and the service life of the system is prolonged. And the stability of the air source heat pump air-conditioning system is improved. The method can be widely applied to the technical field of air conditioner control.

Description

Technical Field

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

[0002] In traditional heat pump air conditioners, under ultra-low ambient temperature conditions, due to incomplete evaporation of the refrigerant in the fin heat exchanger, a large amount of refrigerant is stored in the gas-liquid separator of the system in the form of liquid, resulting in the risk of liquid backflow in the heat pump unit, which leads to a decrease in the stability of the air source heat pump air conditioning system. Therefore, there are still technical problems that need to be solved in the relevant technology. Summary of the invention

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

[0004] To this end, an object of an embodiment of the present application is to provide an air source heat pump air conditioning system control method, equipment, device and storage medium, which can reduce the risk of liquid backflow in the heat pump unit and improve the stability of the air source heat pump air conditioning system.

[0005] In order to achieve the above-mentioned technical objectives, the technical solution adopted in the embodiments of the present application includes: a method for controlling an air source heat pump air conditioning system, comprising: obtaining the return air temperature, coil inlet temperature and accumulated liquid temperature of the air source heat pump air conditioning system; determining the system return air superheat 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 and the accumulated liquid temperature.

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

[0007] Further, in the embodiment of the present application, the first ball valve and the second ball valve of the air source heat pump air conditioning system are adjusted according to the system return air superheat and the accumulated liquid temperature, including:

[0008] 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 return air superheat is less than or equal to the first set value, and the accumulated liquid temperature is less than the second set value, the first ball valve is adjusted to open at the first preset opening;

[0009] In the heating mode, after the first ball valve is opened with the first preset opening, when the ambient temperature is lower than the first preset temperature, the system return air superheat is less than or equal to the third setting value, and the accumulated liquid temperature is less than or equal to the second setting value and the maintenance time is greater than the first time threshold, the first ball valve is adjusted from the first preset opening to the second preset opening.

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

[0011] K1=K2+P1

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

[0013] Further, in the embodiment of the present application, the first ball valve and the second ball valve of the air source heat pump air conditioning system are adjusted according to the system return air superheat and the accumulated liquid temperature, and further include:

[0014] In cooling mode, the first ball valve and the second ball valve are closed, and the operation of the electronic expansion valve is controlled by a PID algorithm.

[0015] Further, in the embodiment of the present application, the first ball valve and the second ball valve of the air source heat pump air conditioning system are adjusted according to the system return air superheat and the accumulated liquid temperature, and further include:

[0016] In the 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 degree.

[0017] Further, in the embodiment of the present application, the first ball valve and the second ball valve of the air source heat pump air conditioning system are adjusted according to the system return air superheat and the accumulated liquid temperature, and further include:

[0018] 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 return air superheat is less than or equal to the first set value, and the accumulated liquid temperature is less than the second set value, the second ball valve is adjusted to open at a fourth preset opening;

[0019] In the heating mode, after the first ball valve is opened with the first preset opening, when the ambient temperature is lower than the first preset temperature, the system return air superheat is less than or equal to the third setting value, and the accumulated liquid temperature is less than or equal to the second setting value and the maintenance time is greater than the first time threshold, the second ball valve is controlled to maintain the fourth preset opening.

[0020] Further, in an embodiment of the present application, determining the system return air superheat according to the return air temperature and the coil inlet temperature includes: subtracting the return air temperature and the coil inlet temperature to obtain a first difference; and using the first difference as the system return air superheat.

[0021] On the other hand, the embodiment of the present application also provides an air source heat pump air conditioning system control device, including:

[0022] An acquisition unit, used to acquire the return air temperature, coil inlet temperature and liquid accumulation temperature of the air source heat pump air conditioning system;

[0023] A first processing unit, used for determining the system return air superheat according to the return air temperature and the coil inlet temperature;

[0024] The second processing unit is 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 and the accumulated liquid temperature.

[0025] On the other hand, the present application also provides an air source heat pump air conditioning system control device, comprising:

[0026] at least one processor;

[0027] at least one memory for storing at least one program;

[0028] When the at least one program is executed by the at least one processor, the at least one processor implements an air source heat pump air conditioning system control method as described in any one of the invention contents.

[0029] In addition, the present application also provides a computer-readable storage medium, which stores processor-executable instructions. When the processor-executable instructions are executed by the processor, they are used to execute an air source heat pump air conditioning system control method as described in any of the above items.

[0030] The advantages and benefits of the present application will be partially given in the following description, and partially become apparent from the following description, or be understood through the practice of the present application:

[0031] The present application can obtain the return air temperature, coil inlet temperature and accumulated liquid temperature of the air source heat pump air conditioning system; determine the system return air superheat 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 and the accumulated liquid temperature. The present application controls the opening of the ball valve to adjust the refrigerant flow of the return air branch, 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 working of the reactor, increasing the refrigerant circulation volume of the system, reducing the risk of liquid return in the system at low ambient temperatures, and improving the stability of the air source heat pump air conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the steps of a method for controlling an air source heat pump air conditioning system in a specific embodiment of the present invention;

[0033] Figure 2 It is a structural schematic diagram of an air source heat pump air conditioning system in a specific embodiment of the present invention;

[0034] Figure 3 It is a structural schematic diagram of an air source heat pump air conditioning system in a heating mode in a specific embodiment of the present invention;

[0035] Figure 4 It is a structural schematic diagram of an air source heat pump air conditioning system in cooling mode in a specific embodiment of the present invention;

[0036] Figure 5 It is a structural schematic diagram of an air source heat pump air conditioning system in a defrost mode in a specific embodiment of the present invention;

[0037] Figure 6 It is a structural schematic diagram of an air source heat pump air conditioning system control device in a specific embodiment of the present invention;

[0038] Figure 7 It is a structural schematic diagram of an air source heat pump air conditioning system control device in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0039] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings to illustrate the principles and processes of the air source heat pump air conditioning system control method, equipment, device and storage medium in the embodiments of the present invention.

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

[0041] PID algorithm: The PID control algorithm combines three control links: proportional, integral and differential. The control output is adjusted through the combination of these three links to make the actual output value of the system as close as possible to the expected reference value.

[0042] Proportional control: The output of the proportional controller is proportional to the input deviation, which can quickly reflect and reduce the deviation, 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, reducing stability performance.

[0043] Integral control: Integral control is mainly used to eliminate static error and improve the system's degree of freedom from error. The strength of the integral effect depends on the integral time constant Ti. The smaller Ti is, the faster the integral speed is, and the stronger the integral effect is. The existence of integral control is related to the existence time of the deviation e(t). As long as there is a deviation in the system, the integral link will continue to work, integrating the input deviation, so that the output of the controller and the opening of the actuator will continue to change to reduce the deviation. However, although the introduction of integral control can eliminate static error, it will reduce the response speed of the system, especially for controlled objects with large inertia, which may cause the system to produce large overshoot and oscillation.

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

[0045] Secondly, refer to Figure 1 , Figure 1 Schematic diagram of the steps of a method for controlling an air source heat pump air conditioning system provided in an embodiment of the present application. Figure 1 In the present invention, the air source heat pump air conditioning system control method may include but is not limited to steps S101 to S103.

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

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

[0048] It should be noted that the above-mentioned wired connection method may include a connection between a mobile device and a processing module, and may also include a connection between a processing module and a hardware device, as well as a wired connection between other devices currently known or to be developed in the future and the processing module; and the above-mentioned wireless connection method may 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 wireless connection methods currently known or to be developed in the future.

[0049] S102. Determine the system return air superheat according to the return air temperature and the coil inlet temperature.

[0050] In some embodiments of the present application, the processor can determine the system return air superheat according to the return air temperature and the coil inlet temperature. The system return air superheat 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 return air branch according to the system return air superheat and the accumulated liquid temperature.

[0052] It is understandable that, referring to Figure 2 The return air branch can be a branch consisting of a three-way valve, a first ball valve A, a reactor fluorine cooling plate, a second ball valve B, a gas-liquid separator, and pipes interconnected in pairs.

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

[0054] Furthermore, in an embodiment 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 return air superheat and the accumulated liquid temperature may include steps S201 and S202.

[0055] S201. In the heating mode, when the ambient temperature of the air source heat pump air conditioning system is lower than the first preset temperature, and the system return air superheat is less than or equal to the first set value, and the accumulated liquid temperature is less than the second set value, adjust the first ball valve to open at the first preset opening.

[0056] S202. In the heating mode, after the first ball valve is opened with a first preset opening, when the ambient temperature is lower than the first preset temperature, and the system return air superheat is less than or equal to the third setting value and the accumulated liquid temperature is less than or equal to the second setting value and the maintenance time is greater than the first time threshold, the first ball valve is adjusted from the first preset opening to the second preset opening.

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

[0058] K1=K2+P1

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

[0060] Furthermore, in the embodiment 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 return air superheat and the accumulated liquid temperature may also include step S203.

[0061] S203: In cooling mode, close the first ball valve and the second ball valve, and control the operation of the electronic expansion valve through a PID algorithm.

[0062] Furthermore, in the embodiment 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 return air superheat and the accumulated liquid temperature may also include step S204.

[0063] S204 In the 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.

[0064] Furthermore, in the embodiment 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 return air superheat and the accumulated liquid temperature may also 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, and the system return air superheat is less than or equal to the first set value, and the accumulated liquid temperature is less than the second set value, adjust the second ball valve to open at a fourth preset opening.

[0066] S206. In the heating mode, after the first ball valve is opened with the first preset opening, when the ambient temperature is lower than the first preset temperature, and the system return air superheat is less than or equal to the third setting value and the accumulated liquid temperature is less than or equal to the second setting value and the maintenance time is greater than the first time threshold, the second ball valve is controlled to maintain the fourth preset opening.

[0067] It is understandable that the fourth preset opening can be the same as the fifth preset opening. Specifically, the fourth preset opening and the fifth preset opening can both be 100%. The first preset opening can be the minimum opening of the ball valve, and the second preset opening can be larger than the first preset opening. The third preset opening can be an arbitrary value set by the user.

[0068] Further, in the embodiment of the present application, the step of determining the system return air superheat according to the return air temperature and the coil inlet temperature may include steps S301 and S302.

[0069] Subtract the return air temperature from the coil inlet temperature to obtain the first difference.

[0070] The first difference is taken as the system return air superheat.

[0071] The specific implementation principle of this application is described below with reference to the accompanying drawings:

[0072] Reference Figure 2 The return air branch of this embodiment can be a branch consisting of a three-way valve, a first ball valve A, a reactor fluorine cooling plate, a second ball valve B, a gas-liquid separator, and pipes connected in pairs between them. The system design of this embodiment controls the opening of the ball valve to adjust the refrigerant flow rate of the return air branch, 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, increasing the refrigerant circulation volume of the system, and achieving the purpose of reducing the risk of system liquid return at low or even ultra-low ambient temperatures and improving the capacity of the heat pump unit.

[0073] The sensor on the outside of the gas-liquid separator shell detects the temperature of the accumulated liquid. The sensor between the gas-liquid separator outlet and the compressor suction port detects the return air temperature; the sensor of the fin capillary transition tube detects the coil temperature; and the sensor outside the unit detects the ambient temperature. The following is an analysis based on different heat pump air conditioner modes.

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

[0077] The condition for the first opening of ball valve A is that the return gas superheat is ≤ the set value t1 and the accumulated liquid temperature is ≤ the set value t2, and the holding time is ≥ T1. Ball valve A remains open at the minimum opening. During this process, the opening of ball valve B remains 100%; the opening of the electronic expansion valve is adjusted according to normal logic.

[0078] When ball valve A is opened at the minimum opening, the return gas superheat is ≤ the set value t2, and the effluent temperature is ≤ the set value t2, and the holding time is ≥ T2, the ball valve A opening = minimum opening + P1 step, and then PID adjustment is performed according to the difference between the target supplementary heat superheat and the system supplementary heat superheat. During this process, the ball valve B opening is maintained at 100%. The electronic expansion valve opening is adjusted according to normal logic. Among them, P1 step is the preset opening parameter.

[0079] The value range of T1 and T2 is 1 to 7 minutes; the value range of t1 and t2 is 0 to 15°C; the value range of P1 is 5 to 100%.

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

[0081] Table 2

[0082] Control in cooling mode refers to Table 2 and Figure 4 In cooling mode, both ball valve A and ball valve B remain closed. The opening of the electronic expansion valve is adjusted according to normal logic.

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

[0084] Table 3

[0085] Control in defrost mode refers to Table 3 and Figure 5 In the defrost mode, ball valve A and ball valve B are closed, the opening of the electronic expansion valve is not adjusted, and it operates at the preset defrost opening P2 until the defrost is completed and the normal logic is restored for adjustment.

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

[0087] 1. In heating mode, the present application can utilize the reactor to generate heat, thereby preventing liquid refrigerant from entering the compressor and causing liquid hammer in the compressor.

[0088] 2. In heating mode, this application can increase the refrigerant circulation volume at ultra-low ambient temperature by adjusting the opening of the ball valve, thereby improving the unit capacity.

[0089] In addition, refer to Figure 6 ,and Figure 1Corresponding to the method, an air source heat pump air conditioning system control device is also provided in the embodiment of the present application. The device may include an acquisition unit 1001, a first processing unit 1002 and a second processing unit 1003. The acquisition unit 1001 can be used to obtain the return air temperature, the coil inlet temperature and the accumulated liquid 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 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 and the accumulated liquid temperature.

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

[0091] In some embodiments of the present application, the acquisition unit 1001 can be set in the same gateway or device with a processor as the processing unit 1002. The specific device connection mode and device setting of the acquisition unit 1001 and 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 contents of the above-mentioned air source heat pump air conditioning system control method embodiment are all applicable to the present air source heat pump air conditioning system control device embodiment. The functions specifically implemented by the present air source heat pump air conditioning system control device embodiment are the same as those of the above-mentioned air source heat pump air conditioning system control method embodiment, and the beneficial effects achieved are also the same as those achieved by the above-mentioned air source heat pump air conditioning system control method embodiment.

[0093] and Figure 1 Corresponding to the method, the embodiment of the present application also provides an air source heat pump air conditioning system control device, the specific structure of which can be referred to Figure 7 ,include:

[0094] at least one processor 1011;

[0095] At least one memory 1012, used to store 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 of the above method embodiments are all applicable to the present device embodiments. The functions specifically implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0098] and Figure 1 Corresponding to the method, an embodiment of the present application further provides a computer-readable storage medium, which stores processor-executable instructions, and the processor-executable instructions are used to execute the air source heat pump air conditioning system control method when executed by the processor.

[0099] The contents of the above-mentioned air source heat pump air conditioning system control method embodiment are all applicable to the present storage medium embodiment. The functions specifically implemented by the present storage medium embodiment are the same as those of the above-mentioned air source heat pump air conditioning system control method embodiment, and the beneficial effects achieved are also the same as those achieved by the above-mentioned air source heat pump air conditioning system control method embodiment.

[0100] In some optional embodiments, the function / operation mentioned in the block diagram may not occur in the order mentioned in the operation diagram. For example, depending on the function / operation involved, the two boxes shown in succession can actually be executed substantially simultaneously or the boxes can sometimes be executed in reverse order. In addition, the embodiment presented and described in the flow chart of the application is provided by way of example, for the purpose of providing a more comprehensive understanding of technology. The disclosed method is not limited to the operation and logic flow presented herein. Optional embodiments are expected, wherein the order of various operations is changed and the sub-operation described as a part of a larger operation is performed independently.

[0101] In addition, although the present application is described in the context of functional modules, it should be understood that, unless otherwise specified, one or more of the functions and / or features can be integrated into a single physical device and / or software module, or one or more functions and / or features can be implemented in a separate physical device or software module. It is also understood that a detailed discussion of the actual implementation of each module is unnecessary for understanding the present application. More specifically, in view of the properties, functions, and internal relationships of the various functional modules in the device disclosed herein, the actual implementation of the module will be understood within the conventional techniques of the engineer. Therefore, those skilled in the art can implement the present application set forth in the claims without excessive experimentation using ordinary techniques. It is also understood that the specific concepts disclosed are merely illustrative and are not intended to limit the scope of the present application, which is determined by the full scope of the attached claims and their equivalents.

[0102] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several programs to enable a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0103] The logic and / or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable programs for implementing the logical functions, and may 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 fetch and execute a program from a program execution system, device or apparatus), or in conjunction with such program execution systems, devices or apparatuses. For purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate or transmit a program for use by a program execution system, device or apparatus, or in conjunction with such program execution systems, devices or apparatuses.

[0104] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0105] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable program execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0106] In the above description of this specification, the description with reference to the terms "one embodiment / example", "another embodiment / example" or "certain embodiments / examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0107] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

[0108] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the described embodiments. Technical personnel familiar with the field may make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all 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 following steps are involved: Get the return air temperature, coil inlet temperature and liquid accumulation temperature of the air source heat pump air conditioning system; Determine the system return air superheat according to the return air temperature and the coil inlet temperature; The first ball valve and / or the second ball valve of the return air branch are adjusted according to the system return air superheat and the accumulated liquid temperature.

2. The air source heat pump air conditioning system control method according to claim 1, characterized in that: The method 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 air superheat and the accumulated liquid temperature includes: 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 return air superheat is less than or equal to the first set value, and the accumulated liquid temperature is less than the second set value, the first ball valve is adjusted to open at the first preset opening; In the heating mode, after the first ball valve is opened with the first preset opening, when the ambient temperature is lower than the first preset temperature, the system return air superheat is less than or equal to the third setting value, and the accumulated liquid temperature is less than or equal to the second setting value and the maintenance time is greater than the first time threshold, the first ball valve is adjusted from the first preset opening to the second preset opening.

3. The air source heat pump air conditioning system control method according to claim 2, characterized in that: The first preset opening and the second preset opening satisfy the following formula: K1=K2+P1 K2 is the first preset opening, K1 is the second preset opening, and P1 is a preset constant.

4. The air source heat pump air conditioning system control method according to claim 2, characterized in that: The method 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 air superheat and the accumulated liquid temperature also includes: In the cooling mode, the first ball valve and the second ball valve are closed, and the operation of the electronic expansion valve is controlled by the PID algorithm.

5. The air source heat pump air conditioning system control method according to claim 2, characterized in that: The method 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 air superheat and the accumulated liquid temperature also includes: In the 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 degree.

6. The air source heat pump air conditioning system control method according to claim 2, characterized in that: The method 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 air superheat and the accumulated liquid temperature also includes: 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 return air superheat is less than or equal to the first set value, and the accumulated liquid temperature is less than the second set value, the second ball valve is adjusted to open at a fourth preset opening; In the heating mode, after the first ball valve is opened with the first preset opening, when the ambient temperature is lower than the first preset temperature, the system return air superheat is less than or equal to the third setting value, and the accumulated liquid temperature is less than or equal to the second setting value and the maintenance time is greater than the first time threshold, the second ball valve is controlled to maintain the fourth preset opening.

7. The air source heat pump air conditioning system control method according to claim 1, characterized in that: Determining the system return air superheat according to the return air temperature and the coil inlet temperature includes: Subtract the return air temperature from the coil inlet temperature to obtain a first difference; The first difference is taken as the system return air superheat.

8. An air source heat pump air conditioning system control device, characterized in that: include: An acquisition unit, used to acquire the return air temperature, coil inlet temperature and liquid accumulation temperature of the air source heat pump air conditioning system; A first processing unit, used for determining the system return air superheat according to the return air temperature and the coil inlet temperature; The second processing unit is 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 and the accumulated liquid temperature.

9. An air source heat pump air conditioning system control device, 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 1-7.

10. A computer-readable storage medium storing instructions executable by a processor, characterized in that: The processor-executable instructions are used to execute an air source heat pump air conditioning system control method as described in any one of claims 1-7 when executed by the processor.

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