Air source heat pump system, control method thereof and storage medium

Abstract

The invention provides an air source heat pump system and a control method thereof and a storage medium, the system comprises a heat pump unit, a heat exchanger and an indoor tail end heat exchange loop, the heat exchange loop of the heat pump unit is connected with the primary side of the heat exchanger, and the indoor tail end heat exchange loop is connected with the secondary side of the heat exchanger; the output end of the indoor tail end heat exchange loop is provided with a straight-through channel and a buffer channel, the straight-through channel and the buffer channel are connected to the output end of the indoor tail end heat exchange loop and the primary side input end of the heat exchanger in parallel, the straight-through channel is provided with a first control valve, and the buffer channel is provided with a second control valve and a buffer water tank. The second control valve is connected in series with the buffer water tank; the straight-through passage is closed when a compressor of the heat pump unit is started and stopped frequently, and the buffer passage is started when the compressor of the heat pump unit is started and stopped frequently. The problem that the compressor is frequently started and stopped under the condition of low-load operation of the whole machine can be solved, and the operation reliability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air source heat pumps, and specifically, to an air source heat pump system, a control method for an air source heat pump system, an air source heat pump system applying the control method for the air source heat pump system, and a computer-readable storage medium applying the control method for the air source heat pump system. Background Art

[0002] With the development of air source heat pump technology, air source heat pump hot and cold water units are increasingly used in areas with hot summers and cold winters. In summer, the fan coil ends are used to blow cold air for cooling, and in winter, floor heating pipes are used for radiant heating, meeting the cooling and heating needs of users at the same time. In order to meet the needs of home users, the selection of air source heat pump hot and cold water units is generally based on local climatic conditions and the user's suite usage area, and the units that can meet the requirements of all rooms being turned on and used at the same time are selected. At this time, when the indoor terminal load is small, that is, when the user closes some indoor terminals due to usage habits or other reasons, the air source heat pump hot and cold water unit will have a large cooling / heating capacity output, and it is easy to reach the set temperature value, causing the unit to start and stop frequently. The frequent start and stop of the unit will not only cause large fluctuations in indoor temperature and affect comfort, but also the frequent start and stop of the compressor will reduce its service life and affect the reliability of the unit operation.

[0003] An existing air source heat pump system includes a heat pump unit, a heat exchanger, a heating water tank and an indoor terminal heat exchange circuit. The heat exchange circuit of the heat pump unit is connected to the primary side of the heat exchanger, the heating water tank is connected to the secondary side of the heat exchanger, and the indoor terminal heat exchange circuit is connected to the heating water tank. Heating hot water can be heated and stored in advance. When there is a heating load demand, heating hot water can be provided stably. When the water temperature of the heating water tank slowly drops to the minimum water supply temperature, the air source heat pump subsystem starts to run and reheats the water in the heating water tank to the set temperature, thereby avoiding frequent start and stop of the compressor when the heating load demand is small, ensuring that the air source heat pump hot water system can operate stably and reliably.

[0004] However, this method controls the operation of the heat pump unit by identifying the water temperature of the heating water tank. The water temperature of the heating water tank cannot be fed back to the temperature of the terminal circuit in time, and it also needs to be heated by the heating water tank first, resulting in high energy consumption.

[0005] Therefore, a more optimized air source heat pump system needs to be considered. Summary of the invention

[0006] The first object of the present invention is to provide an air source heat pump system with low energy consumption that can solve the problem of frequent start and stop of the compressor when the whole machine is running at low load.

[0007] The second object of the present invention is to provide a control method for an air source heat pump system which can solve the problem of frequent start and stop of the compressor when the whole machine is running at low load and improve the operating reliability.

[0008] The third object of the present invention is to provide an air source heat pump system that can solve the problem of frequent start and stop of the compressor when the whole machine is running at low load, thereby improving the operating reliability.

[0009] A fourth object of the present invention is to provide a computer-readable storage medium that can solve the problem of frequent start and stop of the compressor when the whole machine is running at low load, thereby improving the operating reliability.

[0010] In order to achieve the above-mentioned first purpose, the air source heat pump system provided by the present invention includes a heat pump unit, a heat exchanger and an indoor terminal heat exchange circuit, the heat exchange circuit of the heat pump unit is connected to the primary side of the heat exchanger, and the indoor terminal heat exchange circuit is connected to the secondary side of the heat exchanger; the output end of the indoor terminal heat exchange circuit is provided with a straight-through passage and a buffer passage, the straight-through passage and the buffer passage are connected in parallel between the output end of the indoor terminal heat exchange circuit and the primary side input end of the heat exchanger, the straight-through passage is provided with a first control valve, the buffer passage is provided with a second control valve and a buffer water tank, and the second control valve and the buffer water tank are connected in series; the straight-through passage is closed when the compressor of the heat pump unit is frequently started and stopped, and the buffer passage is enabled when the compressor of the heat pump unit is frequently started and stopped.

[0011] As can be seen from the above scheme, the air source heat pump system of the present invention can close the direct passage and enable the buffer passage to work when the compressor is frequently started and stopped by setting a straight-through passage and a buffer passage in the indoor terminal heat exchange circuit, so that the excess energy output by the unit can be stored and released in the buffer water tank, slowing down the large fluctuation of water temperature and reducing the number of frequent starts and stops of the compressor. At the same time, in normal operation, the indoor terminal heat exchange circuit uses a straight-through passage to reduce power consumption.

[0012] In a further solution, an electric auxiliary heating device is also provided on the indoor terminal heat exchange circuit.

[0013] It can be seen from this that by setting up an electric auxiliary heating device, auxiliary heating can be performed when the compressor starts and stops frequently in the heating state, thereby improving temperature stability and reducing the problem of frequent start and stop of the compressor.

[0014] In a further solution, the electric auxiliary heating device is installed on the buffer passage.

[0015] In a further solution, the electric auxiliary heating device is installed at the secondary side output end of the heat exchanger.

[0016] It can be seen that the electric auxiliary heating device can be set up in a variety of ways to increase the application scenarios.

[0017] In order to achieve the second purpose of the present invention, the control method of the air source heat pump system provided by the present invention includes: when entering the heat exchange operation state, opening the direct passage; when it is confirmed that the output capacity of the heat pump unit is greater than the terminal load demand, judging whether the compressor is in a frequent start and stop state; if so, controlling the first control valve to close the direct passage, and controlling the first control valve to open the buffer passage.

[0018] It can be seen from the above scheme that the control method of the air source heat pump system of the present invention, when confirming that the output capacity of the heat pump unit is greater than the terminal load demand and the compressor is in a frequent start and stop state, controls the direct passage to be closed and turns on the buffer passage, so that the excess energy output by the unit is stored and released in the buffer water tank, thereby mitigating large fluctuations in water temperature, reducing the number of frequent starts and stops of the compressor, and improving operational reliability.

[0019] In a further scheme, the step of confirming that the output capacity of the heat pump unit is greater than the terminal load demand includes: obtaining the outlet water temperature of the secondary side output end of the heat exchanger; when the heat exchange operation state is the cooling state, if the difference between the set temperature and the outlet water temperature is greater than the first preset value, it is considered that the output capacity of the heat pump unit is greater than the terminal load demand; when the heat exchange operation state is the heating state, if the difference between the outlet water temperature and the set temperature is greater than the second preset value, it is considered that the output capacity of the heat pump unit is greater than the terminal load demand.

[0020] It can be seen that in the cooling state, if the difference between the set temperature and the outlet water temperature is greater than the first preset value, it means that the outlet water temperature is lower than the set temperature and the unit output capacity is greater than the user's terminal load demand. In the cooling state, if the difference between the outlet water temperature and the set temperature is greater than the second preset value, it means that the outlet water temperature is higher than the set temperature and the unit output capacity is greater than the user's terminal load demand.

[0021] In a further scheme, the step of determining whether the compressor is in a frequent start-stop state includes: obtaining the first average continuous operation time of the compressor during the first preset number of start-stops of the compressor, and obtaining the first average low temperature duration when the outlet water temperature is lower than the set temperature; when the first average continuous operation time is less than or equal to the first preset duration and the first average low temperature duration is greater than or equal to the second preset duration, it is confirmed that the compressor is in a frequent start-stop state.

[0022] It can be seen from this that through the compressor auxiliary heating start-stop frequency, when the first average continuous operation time is less than or equal to the first preset time and the first average low temperature duration is greater than or equal to the second preset time, it means that the compressor starts and stops more frequently.

[0023] In a further scheme, after controlling the first control valve to close the direct passage and controlling the first control valve to open the buffer passage, it also includes: obtaining the second average continuous operation time of the compressor during the second preset number of times the compressor is started and stopped; if the second average continuous operation time is less than or equal to the third preset time, obtaining the second average low temperature duration when the outlet water temperature is lower than the set temperature; if the second average low temperature duration is greater than or equal to the fourth preset time, sending a prompt message that the terminal load is small.

[0024] It can be seen from this that after controlling the first control valve to close the direct passage and controlling the first control valve to open the buffer passage, the user's terminal usage can be further identified through the compressor start and stop frequency and the inlet and outlet water temperatures, prompting the user that the unit is in a low-load operating state, and the unit can be appropriately shut down to improve operating energy efficiency.

[0025] In a further scheme, after obtaining the second average continuous operation time of the compressor during the second preset number of compressor start-stop times, it also includes: when the heat exchange operation state is the heating state, if the second average continuous operation time is greater than the third preset time; then turning on the electric auxiliary heating device for heating.

[0026] It can be seen that in the heating state, if the second average continuous operating time is greater than the third preset time, it means that the compressor has been running continuously for a long time and cannot reach the user-set temperature, that is, the heating output of the unit itself can no longer meet the user's usage needs. At this time, turn on the auxiliary electric heating to heat the water temperature and increase the unit's heating output to meet the user's usage needs.

[0027] In a further solution, after the step of turning on the electric auxiliary heating device for heating, it also includes: if the cumulative auxiliary heating time of the electric auxiliary heating device is greater than the preset auxiliary heating time, or the second average low temperature duration is greater than or equal to the fourth preset time, then turning off the electric auxiliary heating device.

[0028] It can be seen that the cumulative auxiliary heating time of the electric auxiliary heating device is greater than the preset auxiliary heating time, which means that the auxiliary electric heating has been turned on for a long time and still cannot meet the user's use needs. It means that there is a problem with the auxiliary electric heating power selection or there are other abnormal problems in the operation of the unit itself. In addition, the auxiliary electric heating is prone to damage if it is turned on for a long time. Therefore, turning off the auxiliary electric heating at this time can reduce energy consumption on the one hand, and on the other hand, the water temperature cannot meet the user's needs for a long time, which can also allow users to discover possible problems early. The second average low temperature duration is greater than or equal to the fourth preset duration, which means that the average compressor has a long time to reach the user's set required temperature each time it starts and stops. Turning off the auxiliary electric heating can reduce energy consumption and use the air source heat pump hot and cold water unit for heating as much as possible, which is more energy-saving and power-saving.

[0029] In order to achieve the third purpose of the present invention, the present invention provides an air source heat pump system including a processor and a memory, the memory stores a computer program, and when the computer program is executed by the processor, the steps of the control method of the air source heat pump system are implemented.

[0030] In order to achieve the fourth objective of the present invention, the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of the above-mentioned control method of the air source heat pump system when the computer program is executed by a controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of an embodiment of an air source heat pump system of the present invention.

[0032] Figure 2 It is a structural schematic diagram of the installation position of another electric auxiliary heating device in the embodiment of the air source heat pump system of the present invention.

[0033] Figure 3 It is a flow chart of an embodiment of a control method of an air source heat pump system of the present invention.

[0034] Figure 4 It is a flow chart of controlling the electric auxiliary heating device in an embodiment of the control method of the air source heat pump system of the present invention.

[0035] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0036] like Figure 1 As shown, in this embodiment, the air source heat pump system includes a heat pump unit 1, a heat exchanger 2 and an indoor terminal heat exchange loop 3. The heat exchange loop of the heat pump unit 1 is connected to the primary side of the heat exchanger 2, and the indoor terminal heat exchange loop 3 is connected to the secondary side of the heat exchanger 2. A straight-through passage 4 and a buffer passage 5 are provided at the output end of the indoor terminal heat exchange loop 3. The straight-through passage 4 and the buffer passage 5 are connected in parallel between the output end of the indoor terminal heat exchange loop 3 and the primary side input end of the heat exchanger 2. The straight-through passage 4 is provided with a first control valve 6, and the buffer passage 5 is provided with a second control valve 7 and a buffer water tank 8. The second control valve 7 and the buffer water tank 8 are connected in series.

[0037] The heat pump unit 1 includes a compressor 101, an outdoor heat exchanger 102, a four-way valve 103 and an electronic expansion valve 104. The compressor 101, the outdoor heat exchanger 102, the four-way valve 103, the electronic expansion valve 104 and the primary side of the heat exchanger 2 form a heat exchange circuit of the heat pump unit 1.

[0038] The indoor terminal heat exchange circuit 3 is also provided with an electric auxiliary heating device 9. By providing the electric auxiliary heating device 9, auxiliary heating can be performed when the compressor 101 is frequently started and stopped in the heating state, thereby improving the temperature stability and reducing the problem of frequent start and stop of the compressor 101. In this embodiment, the electric auxiliary heating device 9 is installed on the buffer passage 5. In another optional embodiment, Figure 2 As shown, the electric auxiliary heating device 9 is installed at the secondary side output end of the heat exchanger 2.

[0039] The secondary side input end of the heat exchanger 2 is provided with an inlet water temperature sensor 10 and the secondary side output end is provided with an inlet water temperature sensor 11. The inlet water temperature sensor 10 and the inlet water temperature sensor 11 are used to obtain the inlet water temperature and the outlet water temperature of the secondary side of the heat exchanger 2 respectively.

[0040] In addition, the indoor terminal heat exchange loop 3 is also provided with a water pump 12 , and the water pump 12 is used to control the liquid circulation in the indoor terminal heat exchange loop 3 .

[0041] The air source heat pump system of the present invention is provided with a straight-through passage 4 and a buffer passage 5, and when the compressor 101 is frequently started and stopped, the straight-through passage 4 can be closed and the buffer passage 5 can be activated for operation, so that the excess energy output by the unit can be stored and released in the buffer water tank 8, thereby slowing down the large fluctuation of water temperature and reducing the number of frequent starts and stops of the compressor 101. At the same time, during normal operation, the indoor terminal heat exchange circuit 3 uses the straight-through passage 4 to reduce power consumption.

[0042] Control method embodiment of air source heat pump system:

[0043] The control method of the air source heat pump system of the present invention is a computer program applied to the air source heat pump system of the above embodiment, and is used to avoid frequent starting and stopping of the compressor 101.

[0044] In this embodiment, the control method of the air source heat pump system is first executed in step S1 when working, and when entering the heat exchange operation state, the direct passage 4 is opened. When the heat exchange operation state needs to be cooled or heated, a control instruction can be sent through the control panel or the remote controller. After receiving the control instruction, the air source heat pump system enters the corresponding heat exchange operation state according to the set parameters. At this time, the direct passage 4 is opened to reduce the liquid obstruction in the indoor terminal heat exchange loop 3 and improve the heat exchange efficiency.

[0045] After entering the heat exchange operation state, step S2 is executed to determine whether the output capacity of the heat pump unit 1 is greater than the terminal load demand. When the user closes some indoor terminals due to usage habits or other reasons, the heat pump unit 1 will easily reach the set temperature value due to its large cooling / heating capacity output, causing the unit to start and stop frequently. Therefore, in order to avoid frequent start and stop of the compressor, it is necessary to first confirm whether the output capacity of the heat pump unit 1 is greater than the terminal load demand.

[0046] In this embodiment, the step of confirming that the output capacity of the heat pump unit 1 is greater than the terminal load demand includes: obtaining the outlet water temperature of the secondary side output end of the heat exchanger 2; when the heat exchange operation state is the cooling state, if the difference between the set temperature and the outlet water temperature is greater than the first preset value, it is considered that the output capacity of the heat pump unit 1 is greater than the terminal load demand; when the heat exchange operation state is the heating state, if the difference between the outlet water temperature and the set temperature is greater than the second preset value, it is considered that the output capacity of the heat pump unit 1 is greater than the terminal load demand. Among them, the first preset value and the second preset value can be preset according to experimental data. Preferably, the first preset value and the second preset value are both 1°C. In the cooling state, if the difference between the set temperature and the outlet water temperature is greater than the first preset value, it means that the outlet water temperature is lower than the set temperature, and the unit output capacity is greater than the user's terminal load demand. In the cooling state, if the difference between the outlet water temperature and the set temperature is greater than the second preset value, it means that the outlet water temperature is higher than the set temperature, and the unit output capacity is greater than the user's terminal load demand.

[0047] If the output capacity of the heat pump unit 1 is not greater than the terminal load demand, continue to execute step S2 for continuous detection. When it is confirmed that the output capacity of the heat pump unit 1 is greater than the terminal load demand, execute step S2 to determine whether the compressor 101 is in a frequent start and stop state. When the output capacity of the heat pump unit 1 is not greater than the terminal load demand, the compressor is prone to frequent start and stop. Therefore, in order to avoid affecting the normal operation of the air conditioner, it is necessary to detect whether the compressor 101 is in a frequent start and stop state, and further restrictions will be imposed when the compressor 101 is in a frequent start and stop state.

[0048] In this embodiment, the step of judging whether the compressor 101 is in a frequent start-stop state includes: obtaining the first average continuous operation time of the compressor 101 during the first preset number of times of the compressor 101 starting and stopping, and obtaining the first average low temperature duration time when the outlet water temperature is lower than the set temperature; when the first average continuous operation time is less than or equal to the first preset time and the first average low temperature duration time is greater than or equal to the second preset time, it is confirmed that the compressor 101 is in a frequent start-stop state. Among them, the first preset number of times can be preset according to experimental data, the first preset time and the second preset time. Preferably, the first preset number of times is greater than three times, the first preset time is 360 seconds, and the second preset time is 60 seconds. The first average continuous operation time is equal to the sum of the continuous operation time of each time during the first preset number of times divided by the first preset number of times, and the first average low temperature duration time is equal to the sum of the time when the outlet water temperature is lower than the set temperature during the first preset number of times divided by the first preset number of times. Through the auxiliary heating start-stop frequency of the compressor 101, when the first average continuous operation time is less than or equal to the first preset time and the first average low temperature duration time is greater than or equal to the second preset time, it means that the compressor 101 starts and stops frequently.

[0049] If the compressor 101 is not in a state of frequent start-stop, continue to execute step S2. If the compressor 101 is in a state of frequent start-stop, execute step S4, control the first control valve 6 to close the direct passage 4, and control the first control valve 6 to conduct the buffer passage 5. When it is confirmed that the output capacity of the heat pump unit 1 is greater than the terminal load demand and the compressor 101 is in a state of frequent start-stop, control the direct passage 4 to close, and conduct the buffer passage 5, so that the excess energy output by the unit can be stored and released in the buffer water tank 8, slowing down the large fluctuation of water temperature and reducing the number of frequent starts and stops of the compressor 101.

[0050] After controlling the first control valve 6 to close the through passage 4 and controlling the first control valve 6 to conduct the buffer passage 5, step S5 is executed to obtain the second average continuous operation time of the compressor 101 during the second preset number of starts and stops of the compressor 101. The second preset number of times can be preset according to experimental data. Preferably, the second preset number of times is greater than two times. In order to further confirm whether the adjustment has the effect of reducing the number of starts and stops of the compressor 102, it is necessary to further obtain the second average continuous operation time of the compressor 101 during the second preset number of starts and stops of the compressor 101. The second average continuous operation time is equal to the sum of the continuous operation time of each time during the second preset number of times divided by the second preset number of times.

[0051] After obtaining the second average continuous operation time, execute step S6 to determine whether the second average continuous operation time is less than or equal to a third preset time, wherein the third preset time can be preset according to experimental data, and preferably, the third preset time is 3600 seconds.

[0052] If the second average continuous operation time is greater than the third preset time, the start and stop frequency of the compressor is reduced, and the process returns to step S2 to perform the next round of detection.

[0053] If the second average continuous operation time is less than or equal to the third preset time, step S7 is performed to obtain the second average low temperature duration time when the outlet water temperature is lower than the set temperature, wherein the second average low temperature duration time is equal to the sum of the time when the outlet water temperature is lower than the set temperature during the second preset number of times divided by the second preset number of times.

[0054] After obtaining the second average low temperature duration, step S8 is performed to determine whether the second average low temperature duration is greater than or equal to a fourth preset duration. The fourth preset duration can be preset according to experimental data, and preferably, the fourth preset duration is 60 seconds.

[0055] If the second average low temperature duration is less than the fourth preset duration, the process returns to step S4. If the second average low temperature duration is less than the fourth preset duration, it means that the adjustment has a certain effect, and the first control valve 6 can be controlled to close the through passage 4 and to open the buffer passage 5.

[0056] If the second average low temperature duration is greater than or equal to the fourth preset duration, step S9 is executed to send a terminal load small prompt message. The second average low temperature duration is greater than or equal to the fourth preset duration, which means that the long-term adjustment does not meet the user's needs. At this time, the user can be prompted that the unit is in a low-load operation state, and the unit can be appropriately shut down to improve the operation energy efficiency.

[0057] In this embodiment, see Figure 4 , when the heat exchange operation state is the heating state, when executing step S6, if the second average continuous operation time is greater than the third preset time, step S10 is further executed to turn on the electric auxiliary heating device 9 for heating. In the heating state, if the second average continuous operation time is greater than the third preset time, it means that the compressor 101 has been running for a long time and cannot reach the user-set temperature, that is, the heating output of the unit itself can no longer meet the user's use needs. At this time, the auxiliary electric heating device 9 is turned on to heat the water temperature, increase the heating output of the unit, and meet the user's use needs.

[0058] After the step of turning on the electric auxiliary heating device 9 for heating, step S11 is executed to determine whether the cumulative auxiliary heating time of the electric auxiliary heating device 9 is greater than the preset auxiliary heating time, or the second average low temperature duration is greater than or equal to the fourth preset time. The preset auxiliary heating time and the fourth preset time can be preset according to experimental data. Preferably, the preset auxiliary heating time is four hours, and the fourth preset time is 60 seconds.

[0059] If the cumulative auxiliary heating time of the electric auxiliary heating device 9 is not greater than the preset auxiliary heating time, or the second average low temperature duration is greater than or equal to the fourth preset time, then step S11 is continued to perform continuous detection.

[0060] If the cumulative auxiliary heating time of the electric auxiliary heating device 9 is longer than the preset auxiliary heating time, or the second average low temperature duration is longer than or equal to the fourth preset time, then step S12 is executed to turn off the electric auxiliary heating device 9. If the cumulative auxiliary heating time of the electric auxiliary heating device 9 is longer than the preset auxiliary heating time, it means that the auxiliary electric heating has been turned on for a long time and still cannot meet the user's use needs, which means that there is a problem with the auxiliary electric heating power selection or there are other abnormal problems in the operation of the unit itself, and the auxiliary electric heating is prone to damage after being turned on for a long time. Therefore, turning off the auxiliary electric heating at this time can reduce energy consumption on the one hand, and on the other hand, the water temperature cannot meet the user's needs for a long time, which can also allow users to discover possible problems as early as possible. The second average low temperature duration is longer than or equal to the fourth preset time, which means that the average compressor 101 has a long time to reach the user-set required temperature each time it starts and stops. Turning off the auxiliary electric heating can reduce energy consumption, and use the air source heat pump hot and cold water unit for heating as much as possible, which is more energy-saving and power-saving.

[0061] From the above, it can be seen that the control method of the air source heat pump system of the present invention, when confirming that the output capacity of the heat pump unit 1 is greater than the terminal load demand and the compressor 101 is in a frequent start and stop state, controls the direct passage 4 to be closed and connects the buffer passage 5, so that the excess energy output by the unit is stored and released in the buffer water tank 8, thereby mitigating large fluctuations in water temperature, reducing the frequent start and stop times of the compressor 101, and improving operational reliability.

[0062] Air source heat pump system example:

[0063] The air source heat pump system of this embodiment includes a controller, and when the controller executes a computer program, the steps in the control method embodiment of the air source heat pump system are implemented.

[0064] For example, the computer program can be divided into one or more modules, one or more modules are stored in the memory and executed by the controller to complete the present invention. One or more modules can be a series of computer program instruction segments that can complete specific functions, and the instruction segments are used to describe the execution process of the computer program in the air source heat pump system.

[0065] The air source heat pump system may include, but is not limited to, a controller and a memory. Those skilled in the art will appreciate that the air source heat pump system may include more or fewer components, or a combination of certain components, or different components, for example, the air source heat pump system may also include input and output devices, network access devices, buses, etc.

[0066] For example, the controller may be a central processing unit (CPU), other general controllers, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general controller may be a microcontroller or any conventional controller. The controller is the control center of the air source heat pump system, and uses various interfaces and lines to connect the various parts of the entire air source heat pump system.

[0067] The memory can be used to store computer programs and / or modules. The controller realizes various functions of the air source heat pump system by running or executing the computer programs and / or modules stored in the memory, and calling the data stored in the memory. For example, the memory may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound receiving function, a sound conversion to text function, etc.), etc.; the data storage area may store data created according to the use of the mobile phone (such as audio data, text data, etc.), etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (FlashCard), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0068] Computer readable storage medium embodiment:

[0069] If the module integrated in the air source heat pump system of the above embodiment is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the control method embodiment of the above air source heat pump system can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the controller, the steps of the control method embodiment of the above air source heat pump system can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The storage medium may include: any entity or device that can carry computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media does not include electrical carrier signals and telecommunications signals.

[0070] It should be noted that the above are only preferred embodiments of the present invention, but the design concept of the invention is not limited thereto, and any non-substantial modifications made to the present invention using this concept also fall within the protection scope of the present invention.

Claims

1. An air source heat pump system, comprising a heat pump unit, a heat exchanger and an indoor terminal heat exchange circuit, wherein the heat exchange circuit of the heat pump unit is connected to the primary side of the heat exchanger, and the indoor terminal heat exchange circuit is connected to the secondary side of the heat exchanger; characterized in that: The output end of the indoor terminal heat exchange circuit is provided with a straight-through passage and a buffer passage, the straight-through passage and the buffer passage are connected in parallel with the output end of the indoor terminal heat exchange circuit and the primary side input end of the heat exchanger, the straight-through passage is provided with a first control valve, the buffer passage is provided with a second control valve and a buffer water tank, and the second control valve and the buffer water tank are connected in series; The through passage is closed when the compressor of the heat pump unit is frequently started and stopped, and the buffer passage is enabled when the compressor of the heat pump unit is frequently started and stopped.

2. The air source heat pump system according to claim 1, characterized in that: The indoor terminal heat exchange circuit is also provided with an electric auxiliary heating device.

3. The air source heat pump system according to claim 2, characterized in that: The electric auxiliary heating device is installed on the buffer passage.

4. The air source heat pump system according to claim 2, characterized in that: The electric auxiliary heating device is installed at the secondary side output end of the heat exchanger.

5. A control method for an air source heat pump system, the air source heat pump system comprising a heat pump unit, a heat exchanger and an indoor terminal heat exchange circuit, the heat exchange circuit of the heat pump unit is connected to the primary side of the heat exchanger, and the indoor terminal heat exchange circuit is connected to the secondary side of the heat exchanger; characterized in that: The output end of the indoor terminal heat exchange circuit is provided with a straight-through passage and a buffer passage, the straight-through passage and the buffer passage are connected in parallel to the output end of the indoor terminal heat exchange circuit and the primary side input end of the heat exchanger, the straight-through passage is provided with a first control valve, the buffer passage is provided with a second control valve and a buffer water tank, the second control valve and the buffer water tank are connected in series; the straight-through passage is closed when the compressor of the heat pump unit is frequently started and stopped, and the buffer passage is enabled when the compressor of the heat pump unit is frequently started and stopped; The method comprises: When entering the heat exchange operation state, opening the direct passage; When it is confirmed that the output capacity of the heat pump unit is greater than the terminal load demand, determining whether the compressor is in a frequent start-stop state; If so, the first control valve is controlled to close the through passage, and the first control valve is controlled to open the buffer passage.

6. The control method of the air source heat pump system according to claim 5, characterized in that: The step of confirming that the output capacity of the heat pump unit is greater than the terminal load demand includes: Obtaining the outlet water temperature of the secondary side output end of the heat exchanger; When the heat exchange operation state is the cooling state, if the difference between the set temperature and the outlet water temperature is greater than a first preset value, it is considered that the output capacity of the heat pump unit is greater than the terminal load demand; When the heat exchange operation state is the heating state, if the difference between the outlet water temperature and the set temperature is greater than a second preset value, it is considered that the output capacity of the heat pump unit is greater than the terminal load demand.

7. The control method of the air source heat pump system according to claim 6, characterized in that: The steps for determining whether the compressor is in a state of frequent start and stop include: Obtaining a first average continuous operation time of the compressor during a first preset number of starts and stops of the compressor, and obtaining a first average low temperature duration time when the outlet water temperature is lower than the set temperature; When the first average continuous operation duration is less than or equal to a first preset duration and the first average low temperature duration is greater than or equal to a second preset duration, it is confirmed that the compressor is in a frequent start-stop state.

8. The control method of the air source heat pump system according to claim 7, characterized in that: After controlling the first control valve to close the through passage and controlling the first control valve to open the buffer passage, the method further includes: Obtaining a second average continuous operation time of the compressor during a second preset number of starts and stops of the compressor; If the second average continuous operation time is less than or equal to the third preset time, obtaining the second average low temperature duration during which the outlet water temperature is lower than the set temperature; If the duration of the second average low temperature is greater than or equal to a fourth preset duration, a terminal load small prompt message is sent.

9. The control method of the air source heat pump system according to claim 8, characterized in that: The indoor terminal heat exchange circuit is also provided with an electric auxiliary heating device; After obtaining the second average continuous operation time of the compressor during the second preset number of starts and stops of the compressor, the method further includes: When the heat exchange operation state is the heating state, if the second average continuous operation time is greater than the third preset time; Then turn on the electric auxiliary heating device for heating.

10. The control method of the air source heat pump system according to claim 9, characterized in that: After the step of starting the electric auxiliary heating device to heat, the method further includes: If the cumulative auxiliary heating time of the electric auxiliary heating device is greater than the preset auxiliary heating time, or the second average low temperature duration is greater than or equal to the fourth preset time, the electric auxiliary heating device is turned off.

11. An air source heat pump system, comprising a processor and a memory, characterized in that: The memory stores a computer program, and when the computer program is executed by the processor, the steps of the control method of the air source heat pump system according to any one of claims 1 to 10 are implemented.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the controller, the steps of the control method of the air source heat pump system according to any one of claims 1 to 10 are implemented.

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