Defrosting control method and device of air source heat pump unit and air source heat pump unit

Abstract

The application relates to the technical field of heat pumps, and provides a defrosting control method and device of an air source heat pump unit and the air source heat pump unit. The defrosting control method of the air source heat pump unit comprises the following steps: in the case that the air source heat pump unit operates in a heating mode, a plurality of groups of disc pipe temperature change rates of an outdoor heat exchanger of the air source heat pump unit are acquired; and according to the plurality of groups of disc pipe temperature change rates of the outdoor heat exchanger of the air source heat pump unit, the air source heat pump unit is controlled to enter or exit a defrosting mode. The application can improve the accuracy of defrosting control, so that defrosting can be performed in time and accurately, and the end of defrosting can be determined in time, thereby guaranteeing the energy efficiency and normal use of the heat pump unit.

Description

Technical Field

[0001] This invention relates to the field of heat pump technology, and in particular to a defrosting control method, device, and air source heat pump unit for an air source heat pump unit. Background Technology

[0002] When an air source heat pump unit is operating for heating in winter, the outdoor ambient temperature is low, and as air flows through the outdoor heat exchanger coil, frost may form on the outdoor heat exchanger coil, affecting the stability and thermal efficiency of the air source heat pump unit.

[0003] Currently, common defrosting methods include timed defrosting, manual defrosting, and defrosting based on coil temperature. These defrosting methods cannot accurately enter and exit defrosting, which can easily lead to errors in defrosting judgment or untimely defrosting, resulting in the waste of energy such as electricity and heat, and reducing user comfort. Summary of the Invention

[0004] This invention provides a defrosting control method, device, and air source heat pump unit for an air source heat pump unit. It can improve the accuracy of defrosting control, thereby enabling timely and accurate defrosting and timely determination of the end of defrosting, ensuring the energy efficiency and normal operation of the heat pump unit.

[0005] This invention provides a defrosting control method for an air source heat pump unit, comprising:

[0006] When the air source heat pump unit is operating in heating mode, the temperature change rate of multiple coils of the outdoor heat exchanger of the air source heat pump unit is obtained.

[0007] The air source heat pump unit is controlled to enter or exit defrost mode based on the temperature change rate of multiple coils of the outdoor heat exchanger.

[0008] According to the defrosting control method of an air source heat pump unit provided by the present invention, the step of controlling the air source heat pump unit to enter the defrosting mode based on the temperature change rate of multiple coils of the outdoor heat exchanger of the air source heat pump unit specifically includes:

[0009] If the temperature change rate of multiple coils of the outdoor heat exchanger is simultaneously less than zero and greater than or equal to the first preset temperature change rate, the air source heat pump unit is controlled to enter the defrost mode for defrosting.

[0010] According to the present invention, a defrosting control method for an air source heat pump unit includes the following steps for controlling the air source heat pump unit to enter defrosting mode for defrosting:

[0011] The four-way valve of the air source heat pump unit is controlled to switch to defrost mode, so that the refrigerant discharged from the compressor of the air source heat pump unit flows into the outdoor heat exchanger to raise the temperature and defrost.

[0012] According to a defrosting control method for an air source heat pump unit provided by the present invention, the defrosting process of the air source heat pump unit includes:

[0013] The temperature change rate of multiple coils in the outdoor heat exchanger was detected.

[0014] If the temperature change rate of multiple coils of the outdoor heat exchanger is simultaneously equal to the second preset temperature change rate, and the second preset temperature change rate is zero, the air source heat pump unit is controlled to continue defrosting.

[0015] According to the defrosting control method of an air source heat pump unit provided by the present invention, the step of detecting the temperature change rate of multiple coils of the outdoor heat exchanger specifically includes:

[0016] If the difference between the temperature change rate of the multiple coils of the outdoor heat exchanger and the second preset temperature change rate is greater than the preset value, the temperature change rate of the multiple coils of the outdoor heat exchanger is detected once every preset time interval.

[0017] If the difference between the temperature change rate of the multiple coils of the outdoor heat exchanger and the second preset temperature change rate is less than or equal to the preset value, the temperature change rate of the multiple coils of the outdoor heat exchanger will be continuously monitored.

[0018] According to the defrosting control method of an air source heat pump unit provided by the present invention, the step of controlling the air source heat pump unit to exit the defrosting mode based on the temperature change rate of multiple coils of the outdoor heat exchanger of the air source heat pump unit includes:

[0019] If the temperature change rate of multiple coils of the outdoor heat exchanger is simultaneously greater than zero and greater than or equal to a third preset temperature change rate, the air source heat pump unit is controlled to exit the defrost mode and resume the heating mode.

[0020] According to the defrosting control method of an air source heat pump unit provided by the present invention, the steps of controlling the air source heat pump unit to exit the defrosting mode and resume the heating mode specifically include:

[0021] Control the reversing of the four-way valve of the air source heat pump unit so that the refrigerant discharged from the compressor of the air source heat pump unit flows into the indoor heat exchanger of the air source heat pump unit.

[0022] According to a defrosting control method for an air source heat pump unit provided by the present invention, a first temperature sensor and a second temperature sensor are provided at both ends of the coil of the outdoor heat exchanger.

[0023] The temperature change rate of the multiple coils of the outdoor heat exchanger includes: the temperature change rate of the first coil and the temperature change rate of the second coil.

[0024] The first coil temperature change rate is obtained based on the current coil temperature and the previous coil temperature detected by the first temperature sensor.

[0025] The rate of change of the second coil temperature is obtained based on the current coil temperature and the previous coil temperature detected by the second temperature sensor.

[0026] The present invention also provides a defrosting control device for an air source heat pump unit, comprising:

[0027] The acquisition module is used to acquire the temperature change rate of multiple coils of the outdoor heat exchanger of the air source heat pump unit when the air source heat pump unit is operating in heating mode.

[0028] The control module is used to control the air source heat pump unit to enter or exit the defrosting mode based on the temperature change rate of multiple coils of the outdoor heat exchanger of the air source heat pump unit.

[0029] The present invention also provides an air source heat pump unit, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the defrosting control method of the air source heat pump unit described above.

[0030] The defrosting control method, device, and air source heat pump unit provided by this invention determine the start and end of defrosting based on the temperature change rate of multiple coils in the outdoor heat exchanger of the air source heat pump unit. This can effectively improve the accuracy of defrosting control, thereby enabling timely and accurate defrosting and timely determination of the end of defrosting, ensuring the energy efficiency and normal operation of the heat pump unit. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in this invention or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is one of the structural schematic diagrams of the air source heat pump unit provided by the present invention;

[0033] Figure 2 This is a schematic diagram of the heating mode principle of the air source heat pump unit provided by the present invention;

[0034] Figure 3This is a schematic diagram of the defrosting mode principle of the air source heat pump unit provided by the present invention;

[0035] Figure 4 This is one of the flowcharts illustrating the defrosting control method for air source heat pump units provided by the present invention;

[0036] Figure 5 This is the second flowchart illustrating the defrosting control method for air source heat pump units provided by the present invention;

[0037] Figure 6 This is the third flowchart illustrating the defrosting control method for air source heat pump units provided by this invention;

[0038] Figure 7 This is the fourth flowchart illustrating the defrosting control method for air source heat pump units provided by this invention;

[0039] Figure 8 This is a schematic diagram of the defrosting control device for an air source heat pump unit provided by the present invention;

[0040] Figure 9 This is the second structural schematic diagram of the air source heat pump unit provided by the present invention.

[0041] Figure label:

[0042] 1: Compressor; 2: Indoor heat exchanger; 3: Outdoor heat exchanger; 4: Four-way valve;

[0043] 5: First temperature sensor; 6: Second temperature sensor; 7: Throttling device;

[0044] 8: Outdoor fan; 9: Acquisition module; 10: Control module;

[0045] 11: Processor; 12: Communication interface; 13: Memory; 14: Communication bus. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0047] In the description of the embodiments of the present invention, it should be noted that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0050] The following is combined Figures 1-9 The present invention describes a defrosting control method, apparatus, and air source heat pump unit for an air source heat pump unit.

[0051] According to one embodiment of the present invention, referring to Figures 1-3 As shown, this invention provides an air source heat pump unit, mainly comprising: a compressor 1, an indoor heat exchanger 2, an outdoor heat exchanger 3, and a four-way valve 4. The exhaust port of the compressor 1 is connected to the first port a of the four-way valve 4, the intake port of the compressor 1 is connected to the second port b of the four-way valve 4, the indoor heat exchanger 2 is connected to the third port c of the four-way valve 4, and the outdoor heat exchanger 3 is connected to the fourth port d of the four-way valve 4. Furthermore, the indoor heat exchanger 2 and the outdoor heat exchanger 3 are connected together. Multiple temperature sensors are installed at different positions on the coils of the outdoor heat exchanger 3, and these multiple temperature sensors are used to detect the temperature change rate of multiple coils in the outdoor heat exchanger 3.

[0052] Furthermore, the air source heat pump unit also includes a controller, which is electrically connected to multiple temperature sensors. The controller is configured to control the air source heat pump unit to enter or exit defrost mode based on the temperature change rate of multiple coils in the outdoor heat exchanger 3. The specific control process is described below and will not be repeated here.

[0053] It should be noted that by using multiple sets of coil temperature change rates as the criteria for entering and exiting defrost, this invention can quickly and effectively determine the degree of coil temperature change, thereby accurately determining whether the coil of the outdoor heat exchanger 3 is frosted, and effectively improving the accuracy of defrost control.

[0054] According to one embodiment of the present invention, referring to Figure 1 As shown, the inlet and outlet ends of the coil of the outdoor heat exchanger 3 are respectively equipped with a first temperature sensor 5 and a second temperature sensor 6. The first temperature sensor 5 can detect the temperature change rate of the first coil, and the second temperature sensor 6 can detect the temperature change rate of the second coil, realizing the detection and judgment of the temperature change rates of the two sets of coils. When the temperature change rates of the two sets of coils simultaneously meet the conditions for entering or exiting defrosting, the air source heat pump unit is controlled to enter or exit the defrosting mode, which can effectively improve the accuracy of defrosting control.

[0055] According to one embodiment of the present invention, a throttling device 7 is provided between the indoor heat exchanger 2 and the outdoor heat exchanger 3, and the throttling device 7 is used to throttle the refrigerant in the pipeline.

[0056] According to one embodiment of the present invention, the air source heat pump unit further includes an outdoor fan 8, which is arranged side by side with the outdoor heat exchanger 3 to improve airflow.

[0057] The working principle of the air source heat pump unit provided by the present invention is described below, including heating mode and defrosting mode.

[0058] like Figure 2 As shown, in heating mode: the four-way valve 4 is connected in the first direction, with the first port a connected to the third port c and the second port b connected to the fourth port d. The high-temperature and high-pressure refrigerant generated by the compressor 1 flows through the first port a and the third port c of the four-way valve 4 to the indoor heat exchanger 2 to release heat. Then it flows through the throttling device 7 and is throttled before flowing through the outdoor heat exchanger 3 to absorb heat and evaporate. Finally, it flows back to the compressor 1 through the fourth port d and the second port b of the four-way valve 4.

[0059] like Figure 3 As shown, in defrost mode: when the defrost conditions are met, the four-way valve 4 is switched. The four-way valve 4 is switched to the second direction of conduction, with the first port a connected to the fourth port d and the second port b connected to the third port c. The high-temperature and high-pressure refrigerant generated by the compressor 1 flows through the first port a and the fourth port d of the four-way valve 4 to the outdoor heat exchanger 3 to release heat. Then it flows through the throttling device 7 and is throttled before flowing through the indoor heat exchanger 2 to absorb heat and evaporate. Finally, it flows back to the compressor 1 through the third port c and the second port b of the four-way valve 4.

[0060] This invention controls the reversal of the four-way valve 4 during heating mode, causing the high-temperature and high-pressure refrigerant discharged from the compressor 1 to flow in the opposite direction to the outdoor heat exchanger 3, thereby heating the outdoor heat exchanger 3 and achieving the purpose of defrosting.

[0061] The defrosting control method of the air source heat pump unit according to the above embodiments of the present invention will be described below.

[0062] According to one embodiment of the present invention, referring to Figure 4 As shown, the defrosting control method for air source heat pump units provided by the present invention in the above embodiments mainly includes the following steps:

[0063] S100. When the air source heat pump unit is operating in heating mode, obtain the temperature change rate of multiple coils of the outdoor heat exchanger of the air source heat pump unit.

[0064] S200: Based on the temperature change rate of multiple coils of the outdoor heat exchanger of the air source heat pump unit, control the air source heat pump unit to enter or exit the defrosting mode.

[0065] The defrosting control method for air source heat pump units provided in this invention avoids misjudgment problems caused by single data by simultaneously detecting the temperature change rates of multiple coils. It determines the defrosting start conditions based on the temperature change rates of multiple coils, avoiding the untimely and inaccurate defects of timed defrosting and manual defrosting. At the same time, it determines the defrosting end conditions based on the temperature change rates of multiple coils, avoiding the heat energy waste caused by the delay in determining the end of defrosting based on the coil temperature.

[0066] This invention uses multiple sets of coil temperature change rates as the criteria for entering and exiting defrost, which can quickly and effectively determine the degree of coil temperature change, thereby accurately determining whether the outdoor heat exchanger coil is frosted. This effectively improves the accuracy of defrost control, allowing for timely and accurate defrosting and timely determination of the end of defrost, ensuring the energy efficiency and normal operation of the heat pump unit.

[0067] According to one embodiment of the present invention, referring to Figure 5 As shown, the steps for controlling the air source heat pump unit to enter defrost mode based on the temperature change rate of multiple coils in the outdoor heat exchanger of the air source heat pump unit specifically include:

[0068] S201. Determine that the temperature change rate of multiple coils of the outdoor heat exchanger is simultaneously less than zero and greater than or equal to the first preset temperature change rate, and control the air source heat pump unit to enter the defrost mode for defrosting.

[0069] Specifically, when the temperature change rate of multiple coils of the outdoor heat exchanger is simultaneously less than zero and greater than or equal to the first preset temperature change rate, it indicates that the temperature of the outdoor heat exchanger coils drops sharply and frost forms on the outdoor heat exchanger coils. At this time, the air source heat pump unit is controlled to enter the defrost mode for defrosting.

[0070] According to an embodiment of the present invention, the step of controlling the air source heat pump unit to enter the defrost mode for defrosting specifically includes: controlling the four-way valve of the air source heat pump unit to switch to the defrost mode, so that the refrigerant discharged by the compressor of the air source heat pump unit flows into the outdoor heat exchanger to raise the temperature and defrost.

[0071] According to one embodiment of the present invention, referring to Figure 6 As shown, the defrosting process of an air source heat pump unit includes the following steps:

[0072] S202. Detect the temperature change rate of multiple coils in the outdoor heat exchanger;

[0073] S203. Determine that the temperature change rate of multiple coils of the outdoor heat exchanger is simultaneously equal to the second preset temperature change rate, and the second preset temperature change rate is zero, and control the air source heat pump unit to continue defrosting.

[0074] Specifically, during the defrosting process of the air source heat pump unit in defrosting mode, the temperature change rate of multiple coils of the outdoor heat exchanger is continuously monitored. When the temperature change rate of multiple coils of the outdoor heat exchanger is equal to the second preset temperature change rate, and the second preset temperature change rate is zero, it indicates that the coil temperature of the outdoor heat exchanger has hardly changed, indicating that the defrosting has not met the completion conditions and is still in the defrosting process. At this time, the air source heat pump unit is controlled to continue defrosting in order to achieve the purpose of complete defrosting.

[0075] By continuing to monitor the rate of temperature change during the defrosting process, this invention can effectively improve the control accuracy of defrosting, thereby improving the defrosting effect.

[0076] According to an embodiment of the present invention, the step of detecting the temperature change rate of multiple coils in an outdoor heat exchanger specifically includes:

[0077] If the difference between the temperature change rate of multiple coils of the outdoor heat exchanger and the second preset temperature change rate is greater than the preset value, the temperature change rate of multiple coils of the outdoor heat exchanger will be detected once every preset time interval.

[0078] If the difference between the temperature change rate of multiple coils of the outdoor heat exchanger and the second preset temperature change rate is less than or equal to the preset value, the temperature change rate of multiple coils of the outdoor heat exchanger will be continuously monitored.

[0079] Specifically, when detecting the temperature change rate of multiple coils in the outdoor heat exchanger, if the difference between the temperature change rate of multiple coils in the outdoor heat exchanger and the second preset temperature change rate is greater than the preset value, it indicates that the temperature change rate of the coils differs significantly from the second preset temperature change rate. In this case, data can be detected at intervals to achieve the purpose of optimized control. If the difference between the temperature change rate of multiple coils in the outdoor heat exchanger and the second preset temperature change rate is less than or equal to the preset value, it indicates that the temperature change rate of the coils is close to the second preset temperature change rate. In this case, continuous data detection can avoid missed detections, thereby effectively improving the completion rate of defrosting and improving the defrosting effect.

[0080] According to one embodiment of the present invention, referring to Figure 7As shown, the steps for controlling the air source heat pump unit to exit defrost mode based on the temperature change rate of multiple coils in the outdoor heat exchanger include:

[0081] S204. If the temperature change rate of multiple coils of the outdoor heat exchanger is simultaneously greater than zero and greater than or equal to the third preset temperature change rate, control the air source heat pump unit to exit the defrost mode and resume the heating mode.

[0082] Specifically, during the defrosting control process, when the temperature change rate of multiple coils of the outdoor heat exchanger is simultaneously greater than zero and greater than or equal to the third preset temperature change rate, it indicates that the temperature of the outdoor heat exchanger coils has risen sharply, the outdoor heat exchanger coils are frost-free, and defrosting has been completed. At this time, the air source heat pump unit can be controlled to exit the defrosting mode and resume the heating mode.

[0083] According to an embodiment of the present invention, the step of controlling the air source heat pump unit to exit the defrost mode and resume the heating mode specifically includes: controlling the four-way valve of the air source heat pump unit to switch, so that the refrigerant discharged by the compressor of the air source heat pump unit flows into the indoor heat exchanger of the air source heat pump unit for heating, thereby ensuring the indoor heating effect.

[0084] According to one embodiment of the present invention, a first temperature sensor and a second temperature sensor are provided at both ends of the coil of the outdoor heat exchanger; the multiple coil temperature change rates of the outdoor heat exchanger include: a first coil temperature change rate and a second coil temperature change rate; wherein, the first coil temperature change rate is obtained based on the current coil temperature detected by the first temperature sensor and the previous coil temperature; the second coil temperature change rate is obtained based on the current coil temperature detected by the second temperature sensor and the previous coil temperature.

[0085] Understandably, the rate of temperature change is the ratio of the difference between the current coil temperature and the previous coil temperature to the change over time.

[0086] This invention improves the accuracy of defrosting control by simultaneously detecting the temperature change rate of the coil at different locations of the outdoor heat exchanger and making defrosting judgments based on the temperature change rate of the coil at different locations.

[0087] The defrosting control method for an air source heat pump unit provided by this invention will be described below with reference to a specific example, which generally includes:

[0088] (1) Enter defrost control conditions:

[0089] The first temperature sensor on the outdoor heat exchanger coil detects the previous coil temperature as Te1 and the current coil temperature as Te2. The second temperature sensor on the outdoor heat exchanger coil detects the previous coil temperature as Te3 and the current coil temperature as Te4. The time change is ΔT1, and the first preset temperature change rate is ΔTeA. Then, the temperature change rate of the first coil is ΔTeA1 = (Te2 – Te1) / ΔT1, and the temperature change rate of the second coil is ΔTeA2 = (Te4 – Te3) / ΔT1. When ΔTeA1 and ΔTeA2 are both less than 0 and greater than or equal to ΔTeA, it indicates that the outdoor heat exchanger coil is frosted, and the air source heat pump unit enters the defrosting mode.

[0090] (2) Defrosting control:

[0091] Controlling the reversing of the four-way valve of the air source heat pump unit allows the refrigerant discharged from the compressor of the air source heat pump unit to flow into the outdoor heat exchanger for heating and temperature rise, thereby achieving the purpose of defrosting.

[0092] Furthermore, the previous coil temperature detected by the first temperature sensor on the outdoor heat exchanger coil is Te5, and the current coil temperature is Te6. The previous coil temperature detected by the second temperature sensor on the outdoor heat exchanger coil is Te7, and the current coil temperature is Te8. The time change is ΔT2, and the second preset temperature change rate is ΔTeB. Since ΔTeB is 0, the temperature change rate of the first coil is ΔTeB1 = (Te6 – Te5) / ΔT2, and the temperature change rate of the second coil is ΔTeB2 = (Te8 – Te7) / ΔT2. When ΔTeB1 and ΔTeB2 are almost equal to ΔTeB, it indicates that the defrosting has not reached the completion condition and is still in the defrosting process. Defrosting should continue.

[0093] (3) Exit defrosting conditions:

[0094] During the defrosting control process, the previous coil temperature detected by the first temperature sensor on the outdoor heat exchanger coil is Te9, and the current coil temperature is Te10. The previous coil temperature detected by the second temperature sensor on the outdoor heat exchanger coil is Te11, and the current coil temperature is Te12. The time change is ΔT3, and the third preset temperature change rate is ΔTeC. Then, the temperature change rate of the first coil is ΔTeC1 = (Te10 – Te9) / ΔT3, and the temperature change rate of the second coil is ΔTeC2 = (Te12 – Te11) / ΔT3. When ΔTeC1 and ΔTeC2 are both greater than 0 and greater than or equal to ΔTeC, it indicates that defrosting has been completed, and the defrosting mode is exited at this time.

[0095] The defrosting control device for the air source heat pump unit provided by the present invention is described below. The defrosting control device for the air source heat pump unit described below can be referred to in correspondence with the defrosting control method for the air source heat pump unit described above.

[0096] According to one embodiment of the present invention, referring to Figure 8 As shown, the present invention also provides a defrosting control device for an air source heat pump unit, mainly comprising: an acquisition module 9 and a control module 10. The acquisition module 9 is used to acquire the temperature change rate of multiple coils of the outdoor heat exchanger of the air source heat pump unit when the air source heat pump unit is operating in heating mode; the control module 10 is used to control the air source heat pump unit to enter or exit defrosting mode based on the temperature change rate of the multiple coils of the outdoor heat exchanger of the air source heat pump unit.

[0097] The defrosting control device for air source heat pump units provided in this embodiment of the invention determines the start and end of defrosting based on the temperature change rate of multiple coils of the outdoor heat exchanger of the air source heat pump unit. This can effectively improve the accuracy of defrosting control, thereby enabling timely and accurate defrosting and timely determination of the end of defrosting, ensuring the energy efficiency and normal operation of the heat pump unit.

[0098] According to one embodiment of the present invention, referring to Figure 9 As shown, the present invention also provides an air source heat pump unit, which may include: a processor 11, a communication interface 12, a memory 13, and a communication bus 14, wherein the processor 11, the communication interface 12, and the memory 13 communicate with each other through the communication bus 14. The processor 11 can call logical instructions in the memory 13 to execute a defrosting control method for the air source heat pump unit. The method includes: when the air source heat pump unit is operating in heating mode, acquiring the temperature change rate of multiple coils of the outdoor heat exchanger of the air source heat pump unit; and controlling the air source heat pump unit to enter or exit the defrosting mode according to the temperature change rate of the multiple coils of the outdoor heat exchanger of the air source heat pump unit.

[0099] Furthermore, the logical instructions in the aforementioned memory 13 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0100] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the defrosting control method for the air source heat pump unit provided by the above methods. The method includes: when the air source heat pump unit is operating in heating mode, obtaining the temperature change rate of multiple coils of the outdoor heat exchanger of the air source heat pump unit; and controlling the air source heat pump unit to enter or exit the defrosting mode according to the temperature change rate of the multiple coils of the outdoor heat exchanger of the air source heat pump unit.

[0101] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When executed by a processor, the computer program implements a defrosting control method for an air source heat pump unit provided by the methods described above. The method includes: when the air source heat pump unit is operating in heating mode, acquiring the temperature change rate of multiple coils of the outdoor heat exchanger of the air source heat pump unit; and controlling the air source heat pump unit to enter or exit defrosting mode based on the temperature change rate of the multiple coils of the outdoor heat exchanger of the air source heat pump unit.

[0102] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0103] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A defrosting control method of an air source heat pump unit, characterized by, The application relates to an air source heat pump unit and a control method thereof. In the case that the air source heat pump unit operates in a heating mode, a plurality of groups of disc pipe temperature change rates of an outdoor heat exchanger of the air source heat pump unit are obtained; The disc pipe of the outdoor heat exchanger is provided with a first temperature sensor and a second temperature sensor at two ends thereof; The plurality of groups of disc pipe temperature change rates of the outdoor heat exchanger include a first disc pipe temperature change rate and a second disc pipe temperature change rate; The first disc pipe temperature change rate is obtained according to a current disc pipe temperature and a previous disc pipe temperature detected by the first temperature sensor; The second disc pipe temperature change rate is obtained according to a current disc pipe temperature and a previous disc pipe temperature detected by the second temperature sensor; The air source heat pump unit is controlled to enter or exit a defrosting mode according to the plurality of groups of disc pipe temperature change rates of the outdoor heat exchanger of the air source heat pump unit; In the process that the air source heat pump unit defrosts, the plurality of groups of disc pipe temperature change rates of the outdoor heat exchanger are detected; The step of detecting the plurality of groups of disc pipe temperature change rates of the outdoor heat exchanger specifically includes: If the difference between the plurality of groups of disc pipe temperature change rates of the outdoor heat exchanger and a second preset temperature change rate is greater than a preset value, the plurality of groups of disc pipe temperature change rates of the outdoor heat exchanger are detected every preset time interval; If the difference between the plurality of groups of disc pipe temperature change rates of the outdoor heat exchanger and the second preset temperature change rate is less than or equal to the preset value, the plurality of groups of disc pipe temperature change rates of the outdoor heat exchanger are continuously detected.

2. The defrost control method of an air source heat pump unit according to claim 1, characterized by, The step of controlling the air source heat pump unit to enter the defrosting mode according to the plurality of groups of disc pipe temperature change rates of the outdoor heat exchanger of the air source heat pump unit specifically includes: If the plurality of groups of disc pipe temperature change rates of the outdoor heat exchanger are simultaneously less than zero and greater than or equal to a first preset temperature change rate, the air source heat pump unit is controlled to enter the defrosting mode to defrost.

3. The defrost control method of claim 2, wherein, The step of controlling the air source heat pump unit to enter the defrosting mode to defrost specifically includes: The four-way valve of the air source heat pump unit is controlled to reverse to enter the defrosting mode, so that the refrigerant discharged from the compressor of the air source heat pump unit flows into the outdoor heat exchanger to defrost.

4. The defrost control method of claim 2, wherein, In the process that the air source heat pump unit defrosts, the plurality of groups of disc pipe temperature change rates of the outdoor heat exchanger are determined to be simultaneously equal to the second preset temperature change rate, and the second preset temperature change rate is zero, so that the air source heat pump unit is controlled to continue defrosting. The step of controlling the air source heat pump unit to exit the defrosting mode according to the plurality of groups of disc pipe temperature change rates of the outdoor heat exchanger of the air source heat pump unit includes:

5. The defrost control method of claim 1, wherein, If the plurality of groups of disc pipe temperature change rates of the outdoor heat exchanger are simultaneously greater than zero and greater than or equal to a third preset temperature change rate, the air source heat pump unit is controlled to exit the defrosting mode and restore the heating mode. The step of controlling the air source heat pump unit to exit the defrosting mode and restore the heating mode specifically includes:

6. The defrost control method of claim 5, wherein, The four-way valve of the air source heat pump unit is controlled to reverse, so that the refrigerant discharged from the compressor of the air source heat pump unit flows into the indoor heat exchanger of the air source heat pump unit. The application relates to an air source heat pump unit and a control method thereof.

7. A defrosting control device for an air source heat pump unit in the defrosting control method according to any one of claims 1 to 6, characterized by ​ An acquisition module is configured to acquire a plurality of groups of coil temperature change rates of an outdoor heat exchanger of the air source heat pump unit when the air source heat pump unit operates in a heating mode. A control module is configured to control the air source heat pump unit to enter or exit a defrosting mode according to the plurality of groups of coil temperature change rates of the outdoor heat exchanger of the air source heat pump unit.

8. An air source heat pump unit comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein, The processor implements the defrosting control method of the air source heat pump unit according to any one of claims 1-6 when executing the program.

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