Heat pump system and control method and control device of heat pump system

Abstract

The invention provides a heat pump system and a control method and device of the heat pump system. The heating system comprises an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, an electronic expansion valve and a compressor which are mutually connected through a refrigerant pipeline; the water inlet and outlet system comprises a water inlet pipe, a heat exchange water pipe and a water outlet pipe which are sequentially connected, and the heat exchange water pipe and the indoor heat exchanger are oppositely arranged for heat exchange; the water outlet pipe is connected with an auxiliary hot water pipe, the auxiliary hot water pipe flows through the bottom of the outdoor heat exchanger and is used for heating the bottom of the outdoor heat exchanger, and a control valve is arranged on the auxiliary hot water pipe. According to the heat pump system, the bottom of the outdoor heat exchanger is heated through hot water in the auxiliary hot water pipe, so that accumulated ice and accumulated frost at the bottom of the outdoor heat exchanger are eliminated, the heat exchange effect of the outdoor heat exchanger is improved, the heating capacity of the heat pump system is improved, and then the use experience of a user is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of electrical equipment technology, and in particular to a heat pump system, a control method and a control device for the heat pump system. Background Art

[0002] In the related art, when the hot water unit is defrosted at a low outdoor ambient temperature, if the condensed water flow rate is slow, the condensed water will condense into ice when the outdoor temperature is too low. When there is a lot of ice at the bottom of the condenser, it will seriously affect the heat exchange effect of the outdoor condenser and cause the heating capacity to decline rapidly, thus affecting the user experience. Summary of the invention

[0003] The present invention provides a heat pump system, a control method and a control device for the heat pump system, which are used to solve the defects in the prior art and achieve the following technical effects: the heat pump system heats the bottom of an outdoor heat exchanger through hot water in an auxiliary hot water pipe, thereby eliminating ice and frost accumulation at the bottom of the outdoor heat exchanger, improving the heat exchange effect of the outdoor heat exchanger and improving the heating capacity of the heat pump system, thereby ensuring the user experience.

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

[0005] A heating system, including an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, an electronic expansion valve and a compressor interconnected by a refrigerant pipeline;

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

[0007] The water outlet pipe is connected with an auxiliary hot water pipe, which 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 water outlet end of the return water pipe is connected to the water inlet pipe.

[0010] According to a second aspect of the present invention, a control method for a heat pump system based on the first aspect of the present invention comprises:

[0011] Determining that the heat pump system operates in a heating mode and receiving a defrost instruction for controlling the heat pump system to enter a defrost mode, and obtaining an outdoor ambient temperature of an outdoor environment;

[0012] According to the outdoor ambient temperature meeting the set condition, controlling the heat pump system to enter a special defrosting mode;

[0013] In the special defrosting mode, the control valve on the auxiliary hot water pipe is controlled to open, 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 defrost mode according to the outdoor ambient temperature satisfying a set condition specifically includes:

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

[0016] According to one embodiment of the present invention, after the steps of determining that the heat pump system operates in a heating mode, receiving a defrost instruction for controlling the heat pump system to enter a defrost mode, and obtaining an outdoor ambient temperature of an outdoor environment, the control method of the heat pump system further includes:

[0017] Determining that the outdoor ambient temperature is greater than or equal to a second set temperature, controlling the heat pump system to enter a normal defrost mode, in which 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 one embodiment of the present invention, the step of controlling the heat pump system to enter the special defrost mode specifically includes:

[0020] Controlling the control valve to open and performing a defrosting operation on the outdoor heat exchanger;

[0021] Acquire the temperature of the water receiving pan at the bottom of the outdoor heat exchanger, generate a first execution logic according to the water receiving pan temperature and / or the outdoor ambient temperature, and adjust the opening of the control valve according to the first execution logic;

[0022] Wherein, the water receiving pan temperature and the outdoor environment temperature are respectively negatively correlated with the opening of the control valve.

[0023] According to one embodiment of the present invention, a water pump is provided on the water 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] Obtaining the return water temperature in the return water pipe and the auxiliary hot water temperature in the auxiliary hot water pipe, and determining the temperature difference between the auxiliary hot water temperature and the return water temperature;

[0026] According to the temperature difference being less than a set temperature difference, controlling the rotation speed of the water pump to decrease to a set rotation 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] Determining that the heat pump system operates in a heating mode, and controlling the control valve to open, so that the hot water in the auxiliary hot water pipe heats the outdoor heat exchanger;

[0030] Alternatively, it is determined that the heat pump system operates in a cooling mode, and the control valve is controlled to open so that the cold water in the auxiliary hot water pipe cools the outdoor heat exchanger.

[0031] According to a third aspect of the present invention, a control device for a heat pump system based on the first aspect of the present invention comprises:

[0032] an acquisition module, configured to determine that the heat pump system is operating in a heating mode, and receive a defrost instruction for controlling the heat pump system to enter a defrost mode, and acquire an outdoor ambient temperature of an outdoor environment;

[0033] A control module, configured to control the heat pump system to enter a special defrosting mode according to the outdoor ambient temperature meeting a set condition;

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

[0035] According to an embodiment of the fourth aspect of the present invention, an electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the control method of the heat pump system as described in the embodiment of the second aspect of the present invention is implemented.

[0036] According to the heat pump system, control device and control method of the embodiment of the present invention, before executing the defrost operation, it will first be determined 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 condensed water 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, thereby achieving the purpose of defrosting the bottom of the outdoor heat exchanger and ensuring the normal progress of the defrost 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 increase slightly, thereby helping to improve the heating effect of the heat pump system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0039] Figure 2 It is a flow chart of a control method of a heat pump system provided by the present invention;

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

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

[0042] Reference numerals:

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

[0044] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and 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 devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0047] The heat pump system according to the first embodiment of the present invention will be described below with reference to the accompanying drawings. The heat pump system can be used in a water heater to provide hot water for users.

[0048] like Figure 1 As shown, the heat pump system according to the first embodiment of the present invention includes a heating system and a water inlet and outlet 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 which are interconnected through a refrigerant pipeline. The water inlet and outlet system includes a water inlet pipe 91, a hot water exchange pipe (not shown in the figure) and a water outlet pipe 92 which are connected in sequence. The hot water exchange pipe is arranged opposite to the indoor heat exchanger 5 to exchange heat. For example, the hot water exchange pipe flows through the indoor heat exchanger 5 and is arranged corresponding to the heat exchange coil of the indoor heat exchanger 5. In the heating mode, the indoor heat exchanger 5 heats the hot water exchange pipe to produce hot water. In the cooling mode, the indoor heat exchanger 5 cools the hot water exchange pipe to produce cold water.

[0050] The water outlet pipe 92 is connected to an auxiliary hot water pipe 81 , which 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 specific working principle of the heat pump system according to the embodiment of the present invention is as follows:

[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 water exchange water pipe to produce hot water, and then the refrigerant enters the outdoor heat exchanger 3 through the electronic expansion valve 4, and then flows to the compressor 1 through the four-way valve 2, thereby completing a complete heating cycle.

[0053] During heating operation, when the outdoor ambient temperature is low, since the outdoor heat exchanger 3 is on the evaporation side, the temperature of the outdoor heat exchanger 3 will become lower and lower. When the fin temperature is lower than the dew point temperature of the outdoor air, frost (or ice) will form on the outdoor heat exchanger 3. When the frost (or ice) of the condenser reaches a certain degree, defrosting operation will be performed, and the unit will continue to heat after defrosting.

[0054] In the above defrosting process, if the outdoor ambient temperature Tao is less than 0°C and the water receiving pan at the bottom of the outdoor heat exchanger 3 does not flow smoothly, the flow rate of the condensed water will decrease. When the outdoor ambient temperature Tao is too low, the condensed water will freeze. Over time, the outdoor heat exchanger 3 will freeze severely, thus affecting the heating effect.

[0055] Therefore, before performing the defrost 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 condensed water 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 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 increase slightly, thereby helping to improve the heating effect of the heat pump system.

[0056] In summary, due to the following defects in the related technology: when the hot water unit is defrosted at a low outdoor ambient temperature, if the condensed water flow rate is slow, the condensed water will condense into ice when the outdoor temperature is too low. When there is a lot of ice at the bottom of the condenser, it will seriously affect the heat exchange effect of the outdoor condenser and cause the heating capacity to decline rapidly, thus affecting the user experience.

[0057] The heat pump system of the present 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 through the hot water in the auxiliary hot water pipe 81, thereby eliminating the ice and frost accumulated at the bottom of the outdoor heat exchanger 3, improving the heat exchange effect of the outdoor heat exchanger 3 and improving the heating capacity of the heat pump system, thereby ensuring the user 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. Moreover, since the hairpin tube 31 is located at the bottom of the outdoor heat exchanger 3, hot water can be used to better eliminate frost or ice accumulated at the bottom of the outdoor heat exchanger 3 and in the chassis in contact with 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 through the hairpin tube 31 , and the water outlet end of the return water pipe 82 is connected to the water inlet pipe 91 .

[0061] In this way, the hot water in the auxiliary hot water pipe 81 becomes cold water after heating the frost at the bottom of the outdoor heat exchanger 3. The cold water can enter the water inlet pipe 91 through the return water pipe 82 and pass through the hot water exchange pipe again to produce hot water, thereby realizing the recycling of water resources, avoiding the waste of water resources, and complying with 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 further provided on the water outlet pipe 92, and the water pump 6 is located upstream of the auxiliary hot water pipe 81. In this way, by starting the water pump 6 and controlling the rotation speed of the water pump 6, the water flow in the water 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 for detecting the outdoor ambient temperature and sending 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 of the heat pump system proposed in the embodiment of the second aspect of the present invention are described below with reference to the accompanying drawings. Among them, before the embodiment of the present invention is described in detail, the entire application scenario is first described. The control method, control device, electronic device and computer-readable storage medium of the heat pump system of the embodiment of the present invention can be applied to the air conditioner locally, and can also be applied to the cloud platform in the Internet field, or other types of cloud platforms in the Internet field, or can also be applied to third-party devices. Among them, the third-party device may include many different types such as mobile phones, tablet computers, notebooks, car computers and other smart terminals.

[0065] The following is only an example of a control method applicable to a heat pump system. It should be understood that the control method of the embodiment of the present invention can also be applied to a cloud platform and a third-party device. It should also be pointed out that the control method of the heat pump system of the present invention is based on the heat pump system described above.

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

[0067] Step S1, determining that the heat pump system is operating in a heating mode, and receiving a defrost instruction for controlling the heat pump system to enter a defrost mode, and obtaining an outdoor ambient temperature of an outdoor environment;

[0068] Step S2, according to whether the outdoor ambient temperature meets the set conditions, the heat pump system is controlled to enter a special defrosting mode. In the special defrosting mode, the control valve 7 on the auxiliary hot water pipe 81 is controlled to open, and the heat pump system is controlled to perform a defrosting operation on the outdoor heat exchanger 3.

[0069] According to the control method of the heat pump system of an embodiment of the present invention, its 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 defrost instruction for controlling the heat pump system to enter the defrost mode, the controller does not control it to directly perform the defrost operation on the outdoor heat exchanger 3, but first obtains the outdoor ambient temperature and analyzes and judges the outdoor ambient temperature.

[0070] When the outdoor ambient temperature meets the set conditions (for example, less than the set temperature), it proves that the outdoor ambient temperature is too low. At this time, the condensed water at the bottom of the outdoor heat exchanger 3 has a tendency to frost or freeze. Therefore, the controller will control the heat pump system to enter a special defrost mode. In this mode, different from the ordinary defrost mode, 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 outdoor heat exchanger 3 and ensuring the normal 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 increase 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 in an embodiment of the present invention, when the outdoor heat exchange temperature is too low, the hot water in the auxiliary hot water pipe 81 is used to heat the bottom of the outdoor heat exchanger 3, thereby eliminating the ice and frost accumulated at the bottom of the outdoor heat exchanger 3, improving the heat exchange effect of the outdoor heat exchanger 3 and improving the heating capacity of the heat pump system, thereby ensuring the user experience.

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

[0073] According to the outdoor ambient temperature being 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 relatively low. At this time, the condensed water in the water receiving tray at the bottom of the outdoor heat exchanger 3 is at risk of frosting and freezing. At this time, the control valve 7 needs to be opened to allow hot water to enter the auxiliary hot water pipe 81 and heat the bottom of the outdoor heat exchanger 3, thereby eliminating the frost or ice at the bottom.

[0075] For example, the first set temperature may be 0° C., that is, when the outdoor ambient temperature is lower than 0° C., the heat pump system enters a special defrosting mode. Of course, the present invention does not specifically limit the specific value of the first set temperature, and the first set temperature may also be other temperature values.

[0076] According to some embodiments of the present invention, after determining that the heat pump system operates in a heating mode and receiving a defrost instruction for controlling the heat pump system to enter a defrost mode, and obtaining an outdoor ambient temperature of an outdoor environment, the control method of the heat pump system further includes:

[0077] Determine that the outdoor ambient temperature is greater than or equal to the second set temperature, and control the heat pump system 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 can be understood 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 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 defrosts the indoor heat exchanger 5 by changing the flow direction of the four-way valve 2.

[0080] For example, the second set temperature may be 0° C., that is, when the outdoor ambient temperature is greater than or equal to 0° C., the heat pump system enters the normal defrosting mode. Of course, the present invention does not specifically limit the specific value of the second set temperature, and the second set temperature may 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 defrost mode specifically includes:

[0082] Control the control valve 7 to open and perform a defrosting operation on the outdoor heat exchanger 3;

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

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

[0085] In this embodiment, the lower the water receiving pan temperature 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 control the opening of the control valve 7 to increase, thereby increasing the hot water flow in the auxiliary hot water pipe 81, that is, increasing the heat provided for heating the bottom of the outdoor heat exchanger 3, thereby matching the current large amount of frost or ice at the bottom of the outdoor heat exchanger 3.

[0086] For example, when the temperature of the water receiving pan is in the first temperature range, the control valve 7 is opened to the first opening; when the temperature of the water receiving pan is in the second temperature range, the control valve 7 is opened to the second opening; when the temperature of the water receiving pan is in the third temperature range, the control valve 7 is opened to the third opening. The first temperature range is greater than the second temperature range, the second temperature range is greater than the third temperature range, the first opening is less than the second opening, and the second opening is less than the third opening.

[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 the special defrost mode, the control method of the heat pump system further includes:

[0089] Obtain the return water temperature in the return water pipe 82 and the auxiliary hot water temperature in the auxiliary hot water pipe 81, and determine the temperature difference between the auxiliary hot water temperature and the return water temperature;

[0090] According to the temperature difference being less than the set temperature difference, the rotation speed of the water pump 6 is controlled to be reduced to the set rotation speed, wherein the set rotation speed is positively correlated with the temperature difference.

[0091] It can be understood 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 bottom space of the condenser.

[0092] For example, when the temperature difference is too small, that is, the heat lost by the hot water after heating the bottom of the condenser is too small, it means that the flow rate of the hot water is too fast, and it is impossible to ensure that the hot water fully heats the bottom of the condenser. In addition, since only a small part of the heat of the hot water is used to heat the frost on the bottom of the condenser, most of its heat cannot be fully utilized, so its energy utilization rate is extremely low. Therefore, it is necessary to reduce the speed of the water pump 6 at this time, thereby reducing the flow rate of the hot water in the auxiliary hot water pipe 81, so as to facilitate the full heating of the bottom of the condenser by the hot water and improve the energy utilization rate of the hot water.

[0093] For another example, when the temperature difference is too large, that is, the heat lost by the hot water after heating the bottom of the condenser is too large, it means that the flow rate of the hot water is too slow. At this time, 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. The heating effect of warm water on the bottom of the condenser is poor. From the above, it can be seen that the slow flow rate of hot water will lead to its heating effect. Therefore, it is necessary to increase the speed of the water pump 6 at this time, thereby increasing 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 the 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] According to the temperature difference being in the first temperature difference range, controlling the rotation speed of the water pump 6 to be the first rotation speed;

[0096] According to the temperature difference being in the second temperature difference interval, controlling the rotation speed of the water pump 6 to be the second rotation speed;

[0097] According to the temperature difference being in the third temperature difference interval, the rotation speed of the water pump 6 is controlled to be the third rotation speed.

[0098] The first temperature difference interval is greater than the second temperature difference interval, the second temperature difference interval is greater than the third temperature difference interval, and the first rotational speed is greater than the second rotational speed, and the second rotational speed is greater than the third rotational speed.

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

[0100] The heat pump system is determined to operate in a heating mode, and the control valve 7 is controlled to open so that the hot water in the auxiliary hot water pipe 81 heats the outdoor heat exchanger 3 .

[0101] It can be understood that in the heating mode, when the control valve 7 is opened, hot water enters the hairpin pipe 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 of the heat pump system further includes:

[0103] It is determined that the heat pump system operates in cooling mode, and the control valve 7 is controlled to open so that the cold water in the auxiliary hot water pipe 81 cools the outdoor heat exchanger 3 .

[0104] It can be understood that in the cooling mode, the indoor heat exchanger 5 cools the hot water exchange pipe, so that cold water flows out of the water outlet pipe 92. When the control valve 7 is opened, cold water enters the hairpin pipe 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 of the heat pump system provided by the present invention is described below. The control device of the heat pump system described below and the control method of the heat pump system described above can be referred to each other.

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

[0107] The acquisition module 110 is used to determine that the heat pump system is operating in a heating mode, and receives a defrost instruction for controlling the heat pump system to enter a defrost mode, and acquires an outdoor ambient temperature of an outdoor environment;

[0108] The control module 120 is used to control the heat pump system to enter a special defrosting mode according to the outdoor ambient temperature meeting the set conditions;

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

[0110] The effect of the control device of the heat pump system according to the embodiment of the present invention is similar to the effect of the control method of the heat pump system described above, and will not be described in detail here.

[0111] Figure 4 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 4 As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication interface 820 and the memory 830 communicate with each other through the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to execute the control method of the heat pump system, the method comprising: determining that the heat pump system is operating in a heating mode, and receiving a defrosting instruction for controlling the heat pump system to enter a defrosting mode, obtaining the outdoor environment temperature of the outdoor environment; according to the outdoor environment temperature meeting the set condition, controlling the heat pump system to enter a special defrosting mode; 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.

[0112] In addition, the logic instructions in the above-mentioned memory 830 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0113] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program 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, which includes: determining that the heat pump system is operating in a heating mode, and receiving a defrost instruction for controlling the heat pump system to enter a defrost mode, and obtaining an outdoor ambient temperature of the outdoor environment; based on the outdoor ambient temperature meeting the set conditions, controlling the heat pump system to enter a special defrost mode; 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.

[0114] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute a control method for a heat pump system, the method comprising: determining that the heat pump system is operating in a heating mode, and receiving a defrost instruction for controlling the heat pump system to enter a defrost mode, obtaining an outdoor ambient temperature of the outdoor environment; controlling the heat pump system to enter a special defrost mode based on the outdoor ambient temperature satisfying a set condition; 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.

[0115] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0116] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiment.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat pump system, characterized in that: include: A heating system, including an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, an electronic expansion valve and a compressor interconnected by a refrigerant pipeline; The water inlet and outlet system comprises a water inlet pipe, a water exchange pipe and a water outlet pipe connected in sequence, wherein the water exchange pipe is arranged opposite to the indoor heat exchanger to exchange heat; The water outlet pipe is connected with an auxiliary hot water pipe, which 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.

2. The heat pump system according to claim 1, characterized in that: The auxiliary hot water pipe is connected to a hairpin pipe located at the bottom of the outdoor heat exchanger.

3. The heat pump system according to claim 2, characterized in that: The auxiliary hot water pipe is connected to the return water pipe through the hairpin pipe, and the water outlet end of the return water pipe is connected to the water inlet pipe.

4. A control method for a heat pump system according to any one of claims 1 to 3, characterized in that: include: Determining that the heat pump system operates in a heating mode and receiving a defrost instruction for controlling the heat pump system to enter a defrost mode, and obtaining an outdoor ambient temperature of an outdoor environment; According to the outdoor ambient temperature meeting the set condition, controlling the heat pump system to enter a special defrosting mode; In the special defrosting mode, the control valve on the auxiliary hot water pipe is controlled to open, and the heat pump system is controlled to perform a defrosting operation on the outdoor heat exchanger.

5. The control method of the heat pump system according to claim 4, characterized in that: The step of controlling the heat pump system to enter a special defrost mode according to the outdoor ambient temperature satisfying a set condition specifically comprises: According to the outdoor ambient temperature being lower than the first set temperature, the heat pump system is controlled to enter the special defrosting mode.

6. The control method of the heat pump system according to claim 5, characterized in that: After the step of determining that the heat pump system operates in a heating mode and receiving a defrost instruction for controlling the heat pump system to enter a defrost mode, and obtaining an outdoor ambient temperature of an outdoor environment, the method further includes: Determining that the outdoor ambient temperature is greater than or equal to a second set temperature, controlling the heat pump system to enter a normal defrost mode, in which 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.

7. The control method of the heat pump system according to claim 4, characterized in that: The step of controlling the heat pump system to enter a special defrost mode specifically includes: Controlling the control valve to open and performing a defrosting operation on the outdoor heat exchanger; Acquire the temperature of the water receiving pan at the bottom of the outdoor heat exchanger, generate a first execution logic according to the water receiving pan temperature and / or the outdoor ambient temperature, and adjust the opening of the control valve according to the first execution logic; Wherein, the water receiving pan temperature and the outdoor environment temperature are respectively negatively correlated with the opening of the control valve.

8. The control method of the heat pump system according to claim 4, characterized in that: The water outlet pipe is provided with a water pump, 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: Obtaining the return water temperature in the return water pipe and the auxiliary hot water temperature in the auxiliary hot water pipe, and determining the temperature difference between the auxiliary hot water temperature and the return water temperature; According to the temperature difference being less than a set temperature difference, controlling the rotation speed of the water pump to decrease to a set rotation speed; The set rotation speed is positively correlated with the temperature difference.

9. The control method of the heat pump system according to any one of claims 4 to 8, characterized in that: Also includes: Determining that the heat pump system operates in a heating mode, and controlling the control valve to open, so that the hot water in the auxiliary hot water pipe heats the outdoor heat exchanger; Alternatively, it is determined that the heat pump system operates in a cooling mode, and the control valve is controlled to open so that the cold water in the auxiliary hot water pipe cools the outdoor heat exchanger.

10. A control device for a heat pump system according to any one of claims 1 to 3, characterized in that: include: an acquisition module, configured to determine that the heat pump system is operating in a heating mode, and receive a defrost instruction for controlling the heat pump system to enter a defrost mode, and acquire an outdoor ambient temperature of an outdoor environment; A control module, configured to control the heat pump system to enter a special defrosting mode according to the outdoor ambient temperature meeting a set condition; In the special defrosting mode, the control valve on the auxiliary hot water pipe is controlled to open, and the heat pump system is controlled to perform a defrosting operation on the outdoor heat exchanger.

11. 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, the control method of the heat pump system according to any one of claims 4 to 9 is implemented.

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