Heat pump systems, control methods and control devices for heat pump systems

Abstract

This invention provides a heat pump system, a control method for the heat pump system, and a control device for the heat pump system. The heat pump system includes: a heating system comprising an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, an electronic expansion valve, and a compressor interconnected by refrigerant pipes; and a water inlet / outlet system comprising an inlet pipe, a hot water exchange pipe, and an outlet pipe connected in sequence, wherein the hot water exchange pipe is positioned opposite the indoor heat exchanger to exchange heat; and an auxiliary hot water pipe connected to the outlet pipe, which flows through the bottom of the outdoor heat exchanger and is used to heat the bottom of the outdoor heat exchanger, and a control valve is provided on the auxiliary hot water pipe. The heat pump system of this invention heats the bottom of the outdoor heat exchanger using hot water in the auxiliary hot water pipe, thereby eliminating ice and frost buildup on the bottom of the outdoor heat exchanger, improving the heat exchange effect of the outdoor heat exchanger, and increasing the heating capacity of the heat pump system, thus ensuring a better user experience.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and in particular to heat pump systems, control methods for heat pump systems, and control devices for heat pump systems. Background Technology

[0002] In related technologies, when a hot water unit defrosts in a low outdoor ambient temperature environment, if the condensate flow rate is slow, the condensate will condense into ice under extremely low outdoor temperatures. When a large amount of ice accumulates at the bottom of the condenser, it will severely affect the heat exchange efficiency of the outdoor condenser, causing a rapid decrease in heating capacity and consequently impacting the user experience. Summary of the Invention

[0003] This invention provides a heat pump system, a control method for the heat pump system, and a control device for the heat pump system, in order to overcome the deficiencies in the prior art and achieve the following technical effects: the heat pump system heats the bottom of the outdoor heat exchanger with hot water in the auxiliary hot water pipe, thereby eliminating ice and frost buildup at the bottom of the outdoor heat exchanger, improving the heat exchange effect of the outdoor heat exchanger and increasing the heating capacity of the heat pump system, thus ensuring the user's experience.

[0004] A heat pump system according to a first aspect of the present invention includes:

[0005] The heating system includes an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, an electronic expansion valve, and a compressor, all interconnected by refrigerant pipes.

[0006] The water inlet and outlet system includes an inlet pipe, a hot water exchange pipe and an outlet pipe connected in sequence, wherein the hot water exchange pipe is arranged opposite to the indoor heat exchanger to exchange heat.

[0007] An auxiliary hot water pipe is connected to the outlet pipe. The auxiliary hot water pipe flows through the bottom of the outdoor heat exchanger and is used to heat the bottom of the outdoor heat exchanger. A control valve is provided on the auxiliary hot water pipe.

[0008] According to one embodiment of the present invention, the auxiliary hot water pipe is connected to a hairpin pipe located at the bottom of the outdoor heat exchanger.

[0009] According to one embodiment of the present invention, the auxiliary hot water pipe is connected to the return water pipe through the hairpin pipe, and the outlet end of the return water pipe is connected to the inlet water pipe.

[0010] A control method for a heat pump system based on the first aspect of the present invention, according to a second aspect embodiment of the present invention, includes:

[0011] The system determines the operating heating mode of the heat pump system and receives a defrost command to control the heat pump system to enter the defrost mode, and obtains the outdoor ambient temperature.

[0012] Based on the outdoor ambient temperature meeting the set conditions, the heat pump system is controlled to enter a special defrosting mode;

[0013] In the special defrosting mode, the control valve on the auxiliary hot water pipe is opened, and the heat pump system is controlled to perform a defrosting operation on the outdoor heat exchanger.

[0014] According to an embodiment of the present invention, the step of controlling the heat pump system to enter a special defrosting mode based on the outdoor ambient temperature meeting a set condition specifically includes:

[0015] If the outdoor ambient temperature is lower than the first set temperature, the heat pump system is controlled to enter the special defrosting mode.

[0016] According to an embodiment of the present invention, after determining the operating heating mode of the heat pump system, receiving a defrost command to control the heat pump system to enter the defrost mode, and obtaining the outdoor ambient temperature, the control method of the heat pump system further includes:

[0017] Once the outdoor ambient temperature is determined to be greater than or equal to the second set temperature, the heat pump system is controlled to enter the normal defrost mode. In the normal defrost mode, the control valve on the auxiliary hot water pipe remains closed, and the heat pump system performs a defrost operation on the outdoor heat exchanger.

[0018] Wherein, the second set temperature is greater than or equal to the first set temperature.

[0019] According to an embodiment of the present invention, the step of controlling the heat pump system to enter a special defrosting mode specifically includes:

[0020] The control valve is opened to perform a defrosting operation on the outdoor heat exchanger;

[0021] The temperature of the water receiving pan located at the bottom of the outdoor heat exchanger is obtained, and a first execution logic is generated based on the water receiving pan temperature and / or the outdoor ambient temperature, and the opening degree of the control valve is adjusted based on the first execution logic.

[0022] The temperature of the water receiving pan and the outdoor ambient temperature are both negatively correlated with the opening degree of the control valve.

[0023] According to one embodiment of the present invention, a water pump is provided on the outlet pipe, and the water pump is located upstream of the auxiliary hot water pipe;

[0024] After the step of controlling the heat pump system to enter the special defrost mode, the method further includes:

[0025] The temperature of the return water in the return water pipe and the temperature of the auxiliary hot water in the auxiliary hot water pipe are obtained, and the temperature difference between the auxiliary hot water temperature and the return water temperature is determined.

[0026] If the temperature difference is less than the set temperature difference, the speed of the water pump is controlled to decrease to the set speed.

[0027] The set rotation speed is positively correlated with the temperature difference.

[0028] According to one embodiment of the present invention, the control method of the heat pump system further includes:

[0029] Determine the operating heating mode of the heat pump system and control the control valve to open so that the hot water in the auxiliary hot water pipe heats the outdoor heat exchanger;

[0030] Alternatively, the heat pump system can be set to a cooling mode, and the control valve can be opened to allow the cold water in the auxiliary hot water pipe to cool the outdoor heat exchanger.

[0031] A control device for a heat pump system based on the first aspect of the present invention, according to a third aspect embodiment of the present invention, includes:

[0032] The acquisition module is used to determine the heating mode of the heat pump system, receive a defrosting command to control the heat pump system to enter the defrosting mode, and acquire the outdoor ambient temperature.

[0033] The control module is used to control the heat pump system to enter a special defrosting mode when the outdoor ambient temperature meets the set conditions.

[0034] In the special defrosting mode, the control valve on the auxiliary hot water pipe is opened, and the heat pump system is controlled to perform a defrosting operation on the outdoor heat exchanger.

[0035] An electronic device according to a fourth aspect of the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement a control method for a heat pump system as described in a second aspect of the present invention.

[0036] According to the heat pump system, control device, and control method of the present invention, before performing the defrosting operation, it is first determined whether the outdoor ambient temperature meets the set conditions. If it does (e.g., below a certain set temperature), it proves that the outdoor ambient temperature is too low. At this time, the condensate at the bottom of the outdoor heat exchanger has a tendency to frost or freeze. Therefore, the heat pump system will open the control valve so that the hot water in the outlet pipe can enter the vicinity of the bottom of the outdoor heat exchanger through the auxiliary hot water pipe, thereby heating the frost at the bottom of the outdoor heat exchanger and thus achieving the purpose of defrosting the bottom of the outdoor heat exchanger, ensuring the normal progress of the defrosting operation. In addition, since the outdoor heat exchanger will be affected by the heat of the auxiliary hot water pipe at this time, its low pressure will rise slightly, thereby helping to improve the heating effect of the heat pump system. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of the heat pump system provided by the present invention;

[0039] Figure 2 This is a flowchart illustrating the control method for the heat pump system provided by the present invention;

[0040] Figure 3 This is a schematic diagram of the structure of the control device for the heat pump system provided by the present invention;

[0041] Figure 4 This is a schematic diagram of the structure of the electronic device provided by the present invention.

[0042] Figure label:

[0043] 1. Compressor; 2. Four-way valve; 3. Outdoor heat exchanger; 31. Hairpin tube; 4. Electronic expansion valve; 5. Indoor heat exchanger; 6. Water pump; 7. Control valve; 81. Auxiliary hot water pipe; 82. Return water pipe; 91. Inlet pipe; 92. Outlet pipe; 10. Outdoor temperature sensor; 110. Acquisition module; 120. Control module. Detailed Implementation

[0044] 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.

[0045] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] 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.

[0047] A heat pump system according to a first aspect of the present invention will now be described with reference to the accompanying drawings. This heat pump system can be used in a water heater to provide hot water to a user.

[0048] like Figure 1 As shown, a heat pump system according to a first aspect embodiment of the present invention includes a heating system and an inlet / outlet water system.

[0049] The heating system includes an indoor heat exchanger 5, an outdoor heat exchanger 3, a four-way valve 2, an electronic expansion valve 4, and a compressor 1, all interconnected by refrigerant pipes. The water inlet and outlet system includes an inlet pipe 91, a hot water exchange pipe (not shown in the figure), and an outlet pipe 92 connected in sequence. The hot water exchange pipe is positioned opposite the indoor heat exchanger 5 to exchange heat. For example, the hot water exchange pipe flows through the indoor heat exchanger 5 and corresponds to the heat exchange coils of the indoor heat exchanger 5. In heating mode, the indoor heat exchanger 5 heats the hot water exchange pipe to produce hot water; in cooling mode, the indoor heat exchanger 5 cools the hot water exchange pipe to produce cold water.

[0050] An auxiliary hot water pipe 81 is connected to the outlet pipe 92. The auxiliary hot water pipe 81 flows through the bottom of the outdoor heat exchanger 3 and is used to heat the bottom of the outdoor heat exchanger 3. A control valve 7 is provided on the auxiliary hot water pipe 81.

[0051] The heat pump system according to an embodiment of the present invention operates on the following principle:

[0052] like Figure 1 As shown, in the heating mode of the heat pump system, the refrigerant flows from the compressor 1 through the four-way valve 2 to the indoor heat exchanger 5. The indoor heat exchanger 5 heats the hot water pipe to produce hot water. Then the refrigerant enters the outdoor heat exchanger 3 through the electronic expansion valve 4, and then flows back to the compressor 1 through the four-way valve 2, thus completing a complete heating cycle.

[0053] During heating operation, when the outdoor ambient temperature is low, the temperature of outdoor heat exchanger 3 will decrease as it is on the evaporator side. When the fin temperature drops below the dew point temperature of the outdoor air, outdoor heat exchanger 3 will frost (or ice). When the frost (or ice) on the condenser reaches a certain level, a defrosting operation will be performed, and the unit will continue heating after defrosting is completed.

[0054] During the defrosting process described above, if the outdoor ambient temperature Tao is less than 0°C and the water flow from the drip tray at the bottom of the outdoor heat exchanger 3 is obstructed, the flow rate of the condensate will decrease. When the outdoor ambient temperature Tao is too low, the condensate will freeze. Over time, this will cause severe icing on the outdoor heat exchanger 3, thus affecting the heating effect.

[0055] Therefore, before performing the defrosting operation, the heat pump system of the present invention will first determine whether the outdoor ambient temperature meets the set conditions. If it does (for example, it is lower than a certain set temperature), it proves that the outdoor ambient temperature is too low. At this time, the condensate at the bottom of the outdoor heat exchanger 3 has a tendency to frost or freeze. Therefore, the heat pump system will open the control valve 7 so that the hot water in the outlet pipe 92 can enter the vicinity of the bottom of the outdoor heat exchanger 3 through the auxiliary hot water pipe 81, thereby heating the frost at the bottom of the outdoor heat exchanger 3, thereby achieving the purpose of defrosting the bottom of the outdoor heat exchanger 3 and ensuring the normal progress of the defrosting operation. In addition, since the outdoor heat exchanger 3 will be affected by the heat of the auxiliary hot water pipe 81 at this time, its low pressure will rise slightly, thereby helping to improve the heating effect of the heat pump system.

[0056] In summary, the following defects exist in the relevant technology: When the hot water unit defrosts in a low outdoor ambient temperature, if the condensate flow rate is slow, the condensate will condense into ice under extremely low outdoor temperatures. When a large amount of ice accumulates at the bottom of the condenser, it will severely affect the heat exchange effect of the outdoor condenser, causing a rapid decrease in heating capacity and thus affecting the user experience.

[0057] The heat pump system proposed in this invention can overcome the technical defects in the above-mentioned related technologies. That is, the heat pump system heats the bottom of the outdoor heat exchanger 3 by using hot water in the auxiliary hot water pipe 81, thereby eliminating ice and frost accumulation at the bottom of the outdoor heat exchanger 3, improving the heat exchange effect of the outdoor heat exchanger 3 and increasing the heating capacity of the heat pump system, thus ensuring the user's experience.

[0058] like Figure 1 As shown, according to some embodiments of the present invention, the auxiliary hot water pipe 81 is connected to the hairpin pipe 31 located at the bottom of the outdoor heat exchanger 3.

[0059] In this way, the structure is simple and convenient, and there is no need to set up an additional heat exchange structure at the outdoor heat exchanger 3. Since the hairpin tube 31 is located at the bottom of the outdoor heat exchanger 3, hot water can be used to better eliminate the frost or ice accumulated at the bottom of the outdoor heat exchanger 3 and in the chassis that contacts the hairpin tube 31.

[0060] like Figure 1 As shown, according to some embodiments of the present invention, the auxiliary hot water pipe 81 is connected to the return water pipe 82 via the hairpin pipe 31, and the outlet end of the return water pipe 82 is connected to the inlet water pipe 91.

[0061] In this way, the hot water in the auxiliary hot water pipe 81 becomes cold water after being heated by the frost at the bottom of the outdoor heat exchanger 3. The cold water can enter the inlet pipe 91 through the return water pipe 82 and then be used to produce hot water again through the hot water pipe, thus realizing the recycling of water resources, avoiding the waste of water resources, and conforming to the design concept of green development.

[0062] like Figure 1 As shown, according to some embodiments of the present invention, a water pump 6 is also provided on the outlet pipe 92, and the water pump 6 is located upstream of the auxiliary hot water pipe 81. In this way, by turning on the water pump 6 and controlling the speed of the water pump 6, the water flow in the outlet pipe 92 and the auxiliary hot water pipe 81 can be controlled.

[0063] like Figure 1 As shown, according to some embodiments of the present invention, an outdoor temperature sensor 10 is provided on the outdoor heat exchanger 3 to detect the outdoor ambient temperature and send it to the controller, so that the controller can perform subsequent control based on the outdoor ambient temperature.

[0064] The control method and control device for a heat pump system according to a second aspect embodiment of the present invention are described below with reference to the accompanying drawings. Before providing a detailed description of the embodiments of the present invention, the overall application scenario is first described. The control method, control device, electronic device, and computer-readable storage medium of the heat pump system of the present invention can be applied to local air conditioning systems, cloud platforms in the Internet field, or other types of cloud platforms in the Internet field, or to third-party devices. These third-party devices may include various types such as mobile phones, tablets, laptops, in-vehicle computers, and other smart terminals.

[0065] The following description uses only a control method applicable to a heat pump system as an example. It should be understood that the control method of this invention can also be applied to cloud platforms and third-party devices. It should also be noted that the control method for the heat pump system of this invention is structurally based on the heat pump system described above.

[0066] like Figure 2 As shown, a control method for a heat pump system according to an embodiment of the present invention includes:

[0067] Step S1: Determine the heating mode of the heat pump system and receive a defrost command to control the heat pump system to enter the defrost mode, and obtain the outdoor ambient temperature.

[0068] Step S2: Based on the outdoor ambient temperature meeting the set conditions, control the heat pump system to enter a special defrost mode. In this special defrost mode, control valve 7 on the auxiliary hot water pipe 81 is opened, and the heat pump system performs a defrost operation on the outdoor heat exchanger 3.

[0069] According to the control method of the heat pump system of the present invention, the specific working process is as follows: First, the current operating mode of the heat pump system is obtained. When the heat pump system is in the heating mode and the controller receives a defrosting command to control the heat pump system to enter the defrosting mode, the controller does not control it to directly perform defrosting operation on the outdoor heat exchanger 3. Instead, it first obtains the outdoor ambient temperature and analyzes and judges the outdoor ambient temperature.

[0070] When the outdoor ambient temperature meets the set conditions (e.g., when it is lower than the set temperature), it indicates that the outdoor ambient temperature is too low. At this time, the condensate at the bottom of the outdoor heat exchanger 3 tends to frost or freeze. Therefore, the controller will control the heat pump system to enter a special defrost mode. In this mode, unlike the normal defrost mode, the heat pump system will open the control valve 7, allowing the hot water in the outlet pipe 92 to enter the vicinity of the bottom of the outdoor heat exchanger 3 through the auxiliary hot water pipe 81, thereby heating the frost at the bottom of the outdoor heat exchanger 3 and achieving the purpose of defrosting the outdoor heat exchanger 3, ensuring the normal progress of the defrost operation. In addition, since the outdoor heat exchanger 3 will be affected by the heat of the auxiliary hot water pipe 81 at this time, its low pressure will rise slightly, thereby helping to improve the heating effect of the heat pump system.

[0071] In summary, according to the control method of the heat pump system of the present invention, when the outdoor heat exchange temperature is too low, the bottom of the outdoor heat exchanger 3 is heated by the hot water in the auxiliary hot water pipe 81, thereby eliminating the ice and frost accumulation at the bottom of the outdoor heat exchanger 3, improving the heat exchange effect of the outdoor heat exchanger 3 and increasing the heating capacity of the heat pump system, thus ensuring the user's experience.

[0072] According to some embodiments of the present invention, the step of controlling the heat pump system to enter a special defrosting mode based on the outdoor ambient temperature meeting set conditions specifically includes:

[0073] If the outdoor ambient temperature is lower than the first set temperature, the heat pump system is controlled to enter a special defrosting mode.

[0074] In this embodiment, when the outdoor ambient temperature is lower than the first set temperature, it indicates that the outdoor ambient temperature is low. At this time, the condensate in the water receiving pan at the bottom of the outdoor heat exchanger 3 is at risk of frosting and freezing. At this time, it is necessary to open the control valve 7 so that hot water enters the auxiliary hot water pipe 81 and heats the bottom of the outdoor heat exchanger 3, thereby eliminating the frost or ice at the bottom.

[0075] For example, the first set temperature can be 0°C, meaning that when the outdoor ambient temperature is below 0°C, the heat pump system enters a special defrosting mode. Of course, this invention does not impose a specific limitation on the exact value of the first set temperature; it can also be other temperature values.

[0076] According to some embodiments of the present invention, after determining the heating mode of the heat pump system, receiving a defrosting command to control the heat pump system to enter the defrosting mode, and obtaining the outdoor ambient temperature, the control method of the heat pump system further includes:

[0077] Once the outdoor ambient temperature is determined to be greater than or equal to the second set temperature, the heat pump system is controlled to enter the normal defrost mode. In the normal defrost mode, the control valve 7 on the auxiliary hot water pipe 81 remains closed, and the heat pump system performs a defrost operation on the indoor heat exchanger 5.

[0078] The second set temperature is greater than or equal to the first set temperature.

[0079] It is understandable that when the outdoor ambient temperature is greater than or equal to the second set temperature, it proves that the current outdoor ambient temperature is high. At this time, the risk of ice or frost forming on the outdoor heat exchanger 3 and its bottom is low. Therefore, there is no need to open the control valve 7 to heat the bottom of the outdoor heat exchanger 3. Instead, the heat pump system can be directly controlled to enter the normal defrost mode. In this mode, the heat pump system performs defrost operation on the indoor heat exchanger 5 by changing the flow direction of the four-way valve 2.

[0080] For example, the second set temperature can be 0°C, meaning that when the outdoor ambient temperature is greater than or equal to 0°C, the heat pump system enters normal defrosting mode. Of course, this invention does not impose any specific limitation on the exact value of the second set temperature; it can also be other temperature values.

[0081] According to some embodiments of the present invention, the step of controlling the heat pump system to enter a special defrosting mode specifically includes:

[0082] Control valve 7 is opened, and a defrosting operation is performed on outdoor heat exchanger 3;

[0083] The temperature of the water receiving pan located at the bottom of the outdoor heat exchanger 3 is obtained, and a first execution logic is generated based on the water receiving pan temperature and / or the outdoor ambient temperature, and the opening degree of the control valve 7 is adjusted according to the first execution logic.

[0084] The temperature of the water receiving pan and the outdoor ambient temperature are both negatively correlated with the opening degree of control valve 7.

[0085] In this embodiment, the lower the temperature of the water receiving pan and / or the outdoor ambient temperature, the more frost or ice will form on the bottom of the outdoor heat exchanger 3. Therefore, in order to defrost and de-ice it more efficiently, the controller will increase the opening of the control valve 7, thereby increasing the hot water flow in the auxiliary hot water pipe 81, which means increasing the heat provided to the bottom of the outdoor heat exchanger 3, and thus matching the current large amount of frost or ice on the bottom of the outdoor heat exchanger 3.

[0086] For example, when the water tray temperature is in the first temperature range, control valve 7 opens to the first opening degree; when the water tray temperature is in the second temperature range, control valve 7 opens to the second opening degree; and when the water tray temperature is in the third temperature range, control valve 7 opens to the third opening degree. Wherein, the first temperature range is greater than the second temperature range, the second temperature range is greater than the third temperature range, and the first opening degree is less than the second opening degree, and the second opening degree is less than the third opening degree.

[0087] According to some embodiments of the present invention, a water pump 6 is provided on the water outlet pipe 92, and the water pump 6 is located upstream of the auxiliary hot water pipe 81.

[0088] After the step of controlling the heat pump system to enter a special defrost mode, the control method for the heat pump system also includes:

[0089] The temperature of the return water in the return water pipe 82 and the temperature of the auxiliary hot water in the auxiliary hot water pipe 81 are obtained, and the temperature difference between the auxiliary hot water temperature and the return water temperature is determined.

[0090] If the temperature difference is less than the set temperature difference, the speed of water pump 6 is reduced to the set speed. The set speed is positively correlated with the temperature difference.

[0091] It is understandable that the temperature difference between the auxiliary hot water temperature and the return water temperature can reflect the heat exchange efficiency between the hot water and the space at the bottom of the condenser.

[0092] For example, if the temperature difference is too small, meaning that the heat lost by the hot water after heating the bottom of the condenser is too small, it indicates that the flow rate of the hot water is too fast and cannot guarantee sufficient heating of the bottom of the condenser. Furthermore, since only a small portion of the heat from the hot water is used to heat the bottom of the condenser to form frost, most of the heat cannot be fully utilized, resulting in extremely low energy utilization. Therefore, it is necessary to reduce the speed of the water pump 6 to reduce the flow rate of the hot water in the auxiliary hot water pipe 81, thereby facilitating sufficient heating of the bottom of the condenser and improving the energy utilization rate of the hot water.

[0093] For example, if the temperature difference is too large, meaning that the hot water loses too much heat after heating the bottom of the condenser, it indicates that the hot water flow rate is too slow. In this case, the hot water will stay in the hairpin tube 31 for a long time. During this period, the hot water loses too much heat and becomes warm water. Warm water has a poor heating effect on the bottom of the condenser. As can be seen from the above, a slow hot water flow rate will lead to a poor heating effect. Therefore, it is necessary to increase the speed of the water pump 6 to increase the flow rate of the hot water in the auxiliary hot water pipe 81, so as to ensure the heating effect of the hot water on the bottom of the condenser and avoid the hot water losing its heating effect due to staying in the hairpin tube 31 for too long.

[0094] In a specific embodiment of the present invention, the control method specifically includes:

[0095] Based on the temperature difference being within the first temperature difference range, the speed of water pump 6 is controlled to the first speed.

[0096] Based on the temperature difference being within the second temperature difference range, the speed of water pump 6 is controlled to the second speed.

[0097] Based on the temperature difference being within the third temperature difference range, the speed of water pump 6 is controlled to the third speed.

[0098] Among them, the first temperature difference range is greater than the second temperature difference range, the second temperature difference range is greater than the third temperature difference range, and the first rotation speed is greater than the second rotation speed, and the second rotation speed is greater than the third rotation speed.

[0099] According to some embodiments of the present invention, the control method for a heat pump system further includes:

[0100] Determine the heating mode of the heat pump system and open the control valve 7 so that the hot water in the auxiliary hot water pipe 81 heats the outdoor heat exchanger 3.

[0101] It is understandable that in heating mode, when the control valve 7 is opened, hot water enters the hairpin tube 31 of the outdoor heat exchanger 3 from the auxiliary hot water pipe 81 and heats the outdoor heat exchanger 3. At this time, the evaporation temperature of the outdoor heat exchanger 3 can be increased, thereby improving the heating effect of the heat pump system.

[0102] According to some embodiments of the present invention, the control method for a heat pump system further includes:

[0103] Determine the cooling mode of the heat pump system and open the control valve 7 so that the cold water in the auxiliary hot water pipe 81 cools the outdoor heat exchanger 3.

[0104] It is understandable that in cooling mode, the indoor heat exchanger 5 cools the hot water pipe, so that cold water flows out of the outlet pipe 92. When the control valve 7 is opened, the cold water enters the hairpin tube 31 of the outdoor heat exchanger 3 from the auxiliary hot water pipe 81 and cools the outdoor heat exchanger 3. At this time, the condensing temperature of the outdoor heat exchanger 3 can be reduced, thereby improving the cooling effect of the heat pump system.

[0105] The control device for the heat pump system provided by the present invention is described below. The control device for the heat pump system described below can be referred to in correspondence with the control method for the heat pump system described above.

[0106] like Figure 3 As shown, a control device for a heat pump system according to a third aspect embodiment of the present invention includes:

[0107] The acquisition module 110 is used to determine the heating mode of the heat pump system and receive a defrosting command to control the heat pump system to enter the defrosting mode, and acquire the outdoor ambient temperature.

[0108] Control module 120 is used to control the heat pump system to enter a special defrosting mode when the outdoor ambient temperature meets the set conditions.

[0109] In the special defrosting mode, the control valve 7 on the auxiliary hot water pipe 81 is opened, and the heat pump system is controlled to perform a defrosting operation on the indoor heat exchanger 5.

[0110] The control device for the heat pump system according to the embodiments of the present invention has similar effects to the control method for the heat pump system described above, and will not be repeated here.

[0111] Figure 4 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 4 As shown, the electronic device may include a processor 810, a communication interface 820, a memory 830, and a communication bus 840. The processor 810, communication interface 820, and memory 830 communicate with each other via the communication bus 840. The processor 810 can call logic instructions in the memory 830 to execute a control method for the heat pump system. This method includes: determining the heating mode of the heat pump system and receiving a defrost command to control the heat pump system to enter a defrost mode; acquiring the outdoor ambient temperature; controlling the heat pump system to enter a special defrost mode based on the outdoor ambient temperature meeting set conditions; and in the special defrost mode, controlling the control valve 7 on the auxiliary hot water pipe 81 to open and controlling the heat pump system to perform a defrost operation on the outdoor heat exchanger 3.

[0112] Furthermore, the logical instructions in the aforementioned memory 830 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, in essence, 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 of 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.

[0113] 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 a control method for a heat pump system. The method includes: determining the heating mode of the heat pump system and receiving a defrosting command to control the heat pump system to enter a defrosting mode; obtaining the outdoor ambient temperature; controlling the heat pump system to enter a special defrosting mode based on the outdoor ambient temperature meeting set conditions; and in the special defrosting mode, controlling the control valve 7 on the auxiliary hot water pipe 81 to open and controlling the heat pump system to perform a defrosting operation on the outdoor heat exchanger 3.

[0114] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a control method for a heat pump system. The method includes: determining the heating mode of the heat pump system and receiving a defrosting command to control the heat pump system to enter a defrosting mode; acquiring the outdoor ambient temperature; controlling the heat pump system to enter a special defrosting mode based on the outdoor ambient temperature meeting set conditions; and in the special defrosting mode, controlling the control valve 7 on the auxiliary hot water pipe 81 to open and controlling the heat pump system to perform a defrosting operation on the outdoor heat exchanger 3.

[0115] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and 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.

[0116] 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., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0117] 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 control method for a heat pump system, characterized in that, The heat pump system includes: The heating system includes an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, an electronic expansion valve, and a compressor, all interconnected by refrigerant pipes. The water inlet and outlet system includes an inlet pipe, a hot water exchange pipe and an outlet pipe connected in sequence, wherein the hot water exchange pipe is arranged opposite to the indoor heat exchanger to exchange heat. An auxiliary hot water pipe is connected to the outlet pipe. The auxiliary hot water pipe flows through the bottom of the outdoor heat exchanger and is used to heat the bottom of the outdoor heat exchanger. A control valve is provided on the auxiliary hot water pipe. The auxiliary hot water pipe is connected to the hairpin pipe located at the bottom of the outdoor heat exchanger; The auxiliary hot water pipe is connected to the return water pipe through the hairpin pipe, and the outlet end of the return water pipe is connected to the inlet water pipe; The control method includes: The system determines the operating heating mode of the heat pump system and receives a defrost command to control the heat pump system to enter the defrost mode, and obtains the outdoor ambient temperature. Based on the outdoor ambient temperature meeting the set conditions, the heat pump system is controlled to enter a special defrosting mode; In the special defrosting mode, the control valve on the auxiliary hot water pipe is opened, and the heat pump system is controlled to perform a defrosting operation on the outdoor heat exchanger. A water pump is installed on the outlet pipe, and the water pump is located upstream of the auxiliary hot water pipe; After the step of controlling the heat pump system to enter the special defrost mode, the method further includes: The temperature of the return water in the return water pipe and the temperature of the auxiliary hot water in the auxiliary hot water pipe are obtained, and the temperature difference between the auxiliary hot water temperature and the return water temperature is determined. If the temperature difference is less than the set temperature difference, the speed of the water pump is controlled to decrease to the set speed. The set rotation speed is positively correlated with the temperature difference.

2. The control method for a heat pump system according to claim 1, characterized in that, The step of controlling the heat pump system to enter a special defrosting mode based on the outdoor ambient temperature meeting the set conditions specifically includes: If the outdoor ambient temperature is lower than the first set temperature, the heat pump system is controlled to enter the special defrosting mode.

3. The control method for a heat pump system according to claim 2, characterized in that, After determining the heating mode of the heat pump system, receiving a defrost command to control the heat pump system to enter defrost mode, and obtaining the outdoor ambient temperature, the method further includes: Once the outdoor ambient temperature is determined to be greater than or equal to the second set temperature, the heat pump system is controlled to enter the normal defrost mode. In the normal defrost mode, the control valve on the auxiliary hot water pipe remains closed, and the heat pump system performs a defrost operation on the outdoor heat exchanger. Wherein, the second set temperature is greater than or equal to the first set temperature.

4. The control method for a heat pump system according to claim 1, characterized in that, The step of controlling the heat pump system to enter a special defrosting mode specifically includes: The control valve is opened to perform a defrosting operation on the outdoor heat exchanger; The temperature of the water receiving pan located at the bottom of the outdoor heat exchanger is obtained, and a first execution logic is generated based on the water receiving pan temperature and / or the outdoor ambient temperature, and the opening degree of the control valve is adjusted based on the first execution logic. The temperature of the water receiving pan and the outdoor ambient temperature are both negatively correlated with the opening degree of the control valve.

5. The control method for a heat pump system according to any one of claims 1 to 4, characterized in that, Also includes: Determine the operating heating mode of the heat pump system and control the control valve to open so that the hot water in the auxiliary hot water pipe heats the outdoor heat exchanger; Alternatively, the heat pump system can be set to a cooling mode, and the control valve can be opened to allow the cold water in the auxiliary hot water pipe to cool the outdoor heat exchanger.

6. A control device for a control method of a heat pump system according to claim 1, characterized in that, include: The acquisition module is used to determine the heating mode of the heat pump system, receive a defrosting command to control the heat pump system to enter the defrosting mode, and acquire the outdoor ambient temperature. The control module is used to control the heat pump system to enter a special defrosting mode when the outdoor ambient temperature meets the set conditions. In the special defrosting mode, the control valve on the auxiliary hot water pipe is opened, and the heat pump system is controlled to perform a defrosting operation on the outdoor heat exchanger.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the control method of the heat pump system as described in any one of claims 1 to 5.

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