Control methods for heat pump units and hot water equipment

Abstract

The present invention provides a control method for a heat pump unit and a hot water device. The outdoor heat exchanger of the heat pump unit is connected to a solar energy storage water tank through a hot water branch provided with a solenoid valve; the control method includes: determining that the heat pump unit is in a heating mode, and obtaining the water storage temperature in the solar energy storage water tank; in the case where the water storage temperature is higher than the standard water storage temperature, obtaining the outdoor ambient temperature; determining a first execution logic according to the outdoor ambient temperature, and controlling the action of the solenoid valve according to the first execution logic to achieve temperature control of the outdoor heat exchanger. The control method for the heat pump unit and the hot water device provided by the present invention can increase the evaporation temperature of the outdoor heat exchanger, thereby improving the heating effect of the unit, ensuring the user experience, and realizing the interlocking control between the heat pump unit and the solar energy storage water tank.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and in particular to a control method for heat pump units and a hot water equipment. Background Technology

[0002] In related technologies, with the expansion of the heat pump water heater market and the increasing popularity of these products, the heating performance of heat pump water heaters has attracted much attention. When the water heater unit operates in low outdoor ambient temperatures, the system's heating capacity decreases due to the low evaporation temperature of the outdoor condenser. Furthermore, in homes where solar energy systems are installed, the solar energy system and the heat pump unit operate independently, lacking coordination, thus failing to leverage the advantages of their combined operation. Summary of the Invention

[0003] This invention provides a control method for a heat pump unit and a hot water device to overcome the deficiencies in the prior art and achieve the following technical effects: increasing the evaporation temperature of the outdoor heat exchanger, thereby improving the heating effect of the unit, ensuring the user experience, and realizing the linkage control between the heat pump unit and the solar water storage tank.

[0004] According to a control method for a heat pump unit based on a first aspect of the present invention, the outdoor heat exchanger of the heat pump unit is connected to a solar water storage tank via a hot water branch equipped with a solenoid valve.

[0005] The control method includes:

[0006] Determine that the heat pump unit is in heating mode and obtain the water temperature in the solar water storage tank;

[0007] When the water storage temperature is higher than the standard water storage temperature, the outdoor ambient temperature is obtained;

[0008] The first execution logic is determined based on the outdoor ambient temperature, and the operation of the solenoid valve is controlled according to the first execution logic to achieve temperature control of the outdoor heat exchanger of the heat pump unit.

[0009] According to an embodiment of the present invention, the step of determining the first execution logic based on the outdoor ambient temperature and controlling the operation of the solenoid valve according to the first execution logic specifically includes:

[0010] When the outdoor ambient temperature is greater than or equal to the first set temperature, the solenoid valve is controlled to close.

[0011] When the outdoor ambient temperature is lower than the first set temperature, the solenoid valve is opened to heat the outdoor heat exchanger of the heat pump unit.

[0012] According to an embodiment of the present invention, after the step of controlling the solenoid valve to open when the outdoor ambient temperature is lower than the first set temperature, the control method further includes:

[0013] The opening degree of the solenoid valve is adjusted according to the outdoor ambient temperature and / or the water storage temperature.

[0014] According to one embodiment of the present invention, the step of adjusting the opening degree of the solenoid valve according to the outdoor ambient temperature and / or the water storage temperature specifically includes:

[0015] When the water storage temperature is within the first temperature range, the solenoid valve is fully opened.

[0016] When the water storage temperature is in the second temperature range, the opening degree of the solenoid valve is controlled to vary within the first opening degree range according to the range of the outdoor ambient temperature, and its opening degree is negatively correlated with the outdoor ambient temperature.

[0017] When the water storage temperature is in the third temperature range, the opening degree of the solenoid valve is controlled to change within the second opening degree range according to the range of the outdoor ambient temperature, and its opening degree is negatively correlated with the outdoor ambient temperature.

[0018] Wherein, the minimum value in the first temperature range is greater than or equal to the standard water storage temperature, the second temperature range is greater than the first temperature range, the third temperature range is greater than the second temperature range, and the maximum value of the first opening range is less than the fully open opening, and the second opening range is less than the first opening range.

[0019] According to one embodiment of the present invention, a water pump is provided on the hot water branch line;

[0020] After the step of controlling the solenoid valve to open when the outdoor ambient temperature is lower than the first set temperature, the method further includes:

[0021] Obtain the inlet and outlet water temperatures of the hot water branch, and determine the temperature difference between the inlet and outlet water temperatures;

[0022] The second execution logic is determined based on the temperature difference, and the speed of the water pump is adjusted according to the second execution logic;

[0023] The rotational speed of the water pump is positively correlated with the temperature difference.

[0024] According to one embodiment of the present invention, the solar water storage tank is provided with a heating device, or the indoor heat exchanger of the heat pump unit is arranged opposite to the solar water storage tank to heat it;

[0025] After the step of controlling the solenoid valve to open when the outdoor ambient temperature is lower than the first set temperature, the method further includes:

[0026] The rate of temperature change of the water temperature in the solar water storage tank within a set time period is obtained;

[0027] If the temperature change rate is determined to be negative, the heating device is controlled to turn on and heat the solar water storage tank, or the indoor heat exchanger is controlled to heat the solar water storage tank.

[0028] According to one embodiment of the present invention, the heat pump unit further includes an inlet pipe, a hot water exchange pipe, and an outlet pipe connected to each other. The indoor heat exchanger heats the hot water exchange pipe to generate hot water. The outlet pipe is connected to an auxiliary heat branch. The auxiliary heat branch is connected to the hot water branch and is located upstream of the outdoor heat exchanger. The inlet of the hot water branch is provided with a first control valve. The auxiliary heat branch is provided with a second control valve. The solenoid valve is located downstream of the outdoor heat exchanger.

[0029] After the step of obtaining the water temperature in the solar water storage tank, the method further includes:

[0030] When the water storage temperature is less than or equal to the standard water storage temperature and the outdoor ambient temperature is less than the first set temperature, the first control valve is closed, and the second control valve and the solenoid valve are opened.

[0031] According to one embodiment of the present invention, the control method further includes:

[0032] Determine that the second control valve and the solenoid valve are open and the first control valve is closed, and obtain the water temperature in the auxiliary heating branch;

[0033] Adjust the opening degree of the second control valve and the solenoid valve according to the water temperature in the auxiliary heating branch and / or the outdoor ambient temperature.

[0034] According to one embodiment of the present invention, after the step of obtaining the water temperature in the solar water storage tank, the control method further includes:

[0035] When the water storage temperature is higher than the standard water storage temperature and the outdoor ambient temperature is lower than the first set temperature, the first control valve, the second control valve, and the solenoid valve are all opened.

[0036] The system determines that the first control valve, the second control valve, and the solenoid valve are all open, obtains the water temperature in the auxiliary heating branch, and adjusts the opening degree of the first control valve and the second control valve according to the water storage temperature and the water temperature in the auxiliary heating branch.

[0037] A hot water device according to a second aspect of the present invention includes:

[0038] A heat pump unit 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.

[0039] A solar water storage tank is connected to a hot water branch line equipped with a solenoid valve. The hot water branch line flows through the outdoor heat exchanger of the heat pump unit to heat it.

[0040] A control device for performing the heat pump unit described in the first aspect embodiment of the present invention.

[0041] According to one embodiment of the present invention, the heat pump unit further includes an inlet pipe, a hot water exchange pipe, and an outlet pipe connected in sequence. The hot water exchange pipe is arranged opposite to the indoor heat exchanger to exchange heat. The outlet pipe is connected to an auxiliary heating branch, which is connected to the hot water branch and located upstream of the outdoor heat exchanger. The inlet of the hot water branch is provided with a first control valve, and the auxiliary heating branch is provided with a second control valve. The solenoid valve is located downstream of the outdoor heat exchanger.

[0042] This invention provides a control method for a heat pump unit. A hot water branch is drawn from a solar water storage tank and flows through the outdoor heat exchanger of the heat pump unit. After the water temperature in the solar water storage tank meets the requirements, the opening and closing of the solenoid valve on the hot water branch is controlled based on the outdoor ambient temperature. For example, in a low-temperature environment, the solenoid valve is opened to allow hot water to flow into the hot water branch and heat the outdoor heat exchanger, thereby increasing the evaporation temperature of the outdoor heat exchanger and thus improving the heating effect of the unit, ensuring a better user experience.

[0043] In addition, it can realize the linkage control between the heat pump unit and the solar water storage tank, effectively utilizing the hot water in the solar water storage tank and avoiding waste of resources. Attached Figure Description

[0044] 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.

[0045] Figure 1 This is a flowchart illustrating the control method for the heat pump unit provided by the present invention;

[0046] Figure 2 This is a schematic diagram of the overall structure of the hot water equipment provided by the present invention;

[0047] Figure 3This is a schematic diagram of the structure of a hot water device provided in one embodiment of the present invention;

[0048] Figure 4 This is a schematic diagram of the structure of a hot water device provided in another embodiment of the present invention;

[0049] Figure 5 This is a schematic diagram of the structure of the electronic device provided by the present invention.

[0050] Figure label:

[0051] 10. Solar water storage tank; 20. Hot water branch; 30. Heat pump unit; 40. Control device of heat pump unit; 1. Compressor; 2. Four-way valve; 3. Outdoor heat exchanger; 4. Electronic expansion valve; 5. Indoor heat exchanger; 6. Water pump; 7. Solenoid valve; 81. Inlet pipe; 82. Outlet pipe; 83. Auxiliary heating branch; 91. First control valve; 92. Second control valve; 110. First acquisition module; 120. Second acquisition module; 130. Control module. Detailed Implementation

[0052] 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.

[0053] The following description, with reference to the accompanying drawings, outlines the control method, control device, and linkage equipment between the heat pump unit and the solar water storage tank proposed in this invention. Before detailing the embodiments of this invention, the overall application scenario is described first. The control method, control device, electronic equipment, and computer-readable storage medium of the heat pump unit in this 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.

[0054] The following description uses only the control method applicable to heat pump units as an example. It should be understood that the control method of this embodiment can also be applied to cloud platforms and third-party devices.

[0055] It should also be noted that the air conditioning control method proposed in this invention is targeted, meaning it is applicable to the working scenario of a heat pump unit operating in heating mode. Furthermore, this control method is based on a hot water system that links the heat pump unit and a solar water storage tank, the structure of which is as follows: Figure 3 and Figure 4 As shown, the solar water storage tank 10 is connected to a hot water branch line 20 equipped with a solenoid valve 7. The hot water branch line 20 flows through the outdoor heat exchanger 3 of the heat pump unit to heat it.

[0056] like Figure 1 , Figure 3 and Figure 4 As shown, a control method for a heat pump unit according to a first aspect embodiment of the present invention includes:

[0057] Step S1: Determine that the heat pump unit is in heating mode and obtain the water temperature in the solar water storage tank 10;

[0058] Step S2: Obtain the outdoor ambient temperature when the water storage temperature is higher than the standard water storage temperature;

[0059] Step S3: Determine the first execution logic based on the outdoor ambient temperature, and control the operation of the solenoid valve 7 according to the first execution logic to achieve temperature control of the outdoor heat exchanger 3 of the heat pump unit.

[0060] According to the control method of the heat pump unit of the present invention, the specific working process is as follows: First, when both the heat pump unit and the solar water storage tank 10 are turned on, the current operating mode of the heat pump unit is detected. When the controller determines that the heat pump unit is currently in the heating mode, the controller will further obtain the water storage temperature of the water stored in the solar water storage tank 10.

[0061] It is understandable that, since the purpose of this method is to use the hot water in the solar water storage tank 10 to heat the outdoor heat exchanger 3 to improve the heating effect of the unit, the hot water inside the solar water storage tank 10 can only heat the outdoor heat exchanger 3 to improve the heating effect of the unit when the water temperature inside the solar water storage tank 10 is high, for example, when the water temperature inside the solar water storage tank 10 is higher than the standard water temperature. When the water temperature inside the solar water storage tank 10 is low, for example, when the water temperature inside the solar water storage tank 10 is lower than the standard water temperature, the water inside cannot heat the outdoor heat exchanger 3.

[0062] Therefore, only when the controller determines that the current water temperature in the solar water storage tank 10 is greater than or higher than the standard water temperature will the controller proceed to the next step, that is, to further obtain the specific value of the outdoor ambient temperature, and based on the current outdoor ambient temperature, determine whether the outdoor heat exchanger 3 in the current heating mode needs other heat sources to increase its evaporation temperature.

[0063] It is understandable that if the outdoor ambient temperature is too low, that is, when the outdoor heat exchanger 3 of the heat pump unit is operating in a low-temperature environment, since the outdoor heat exchanger 3 is on the evaporator side, its evaporation temperature will decrease as the heating process continues, thus reducing the heating capacity of the heat pump unit. However, if the outdoor ambient temperature is normal, the evaporation temperature of the outdoor heat exchanger 3 can be maintained at a normal level as the heating process continues, ensuring the normal heating capacity of the heat pump unit.

[0064] As described above, in step S3, the controller analyzes and judges the acquired outdoor ambient temperature. When it is determined that the outdoor ambient temperature meets the conditions, for example, when the outdoor ambient temperature is lower than the set temperature, since the outdoor heat exchanger 3 is at risk of its evaporation temperature decreasing, in order to avoid the adverse effects of the excessively low outdoor ambient temperature on the heat pump unit, the controller will control the hot water in the solar water storage tank 10 to flow through the outdoor heat exchanger 3, that is, control the solenoid valve 7 to open, so that the hot water enters the hot water branch 20 and flows through the outdoor heat exchanger 3 of the heat pump unit to heat it. In this way, under low temperature heating conditions, this method uses the hot water in the solar water storage tank 10 to heat the outdoor heat exchanger 3, thereby increasing the evaporation temperature of the outdoor heat exchanger 3, thereby improving the heating effect of the unit and ensuring the user experience.

[0065] In related technologies, with the expansion of the heat pump water heater market and the increasing popularity of these products, the heating performance of heat pump water heaters has attracted much attention. When the water heater unit operates in low outdoor ambient temperatures, the system's heating capacity decreases due to the low evaporation temperature of the outdoor condenser. Furthermore, in homes where solar energy systems are installed, the solar energy system and the heat pump unit operate independently, lacking coordination, thus failing to leverage the advantages of their combined operation.

[0066] Therefore, in order to solve the technical defects existing in the above-mentioned related technologies, the present invention provides a control method for a heat pump unit. A hot water branch 20 is drawn from the solar water storage tank 10 and flows through the outdoor heat exchanger 3 of the heat pump unit. After the water temperature in the solar water storage tank 10 meets the conditions, the opening and closing of the solenoid valve 7 on the hot water branch 20 is controlled based on the outdoor ambient temperature. For example, in a low-temperature environment, the solenoid valve 7 is controlled to open so that hot water flows into the hot water branch 20 and heats the outdoor heat exchanger 3, thereby increasing the evaporation temperature of the outdoor heat exchanger 3, thereby improving the heating effect of the unit and ensuring the user's experience.

[0067] In addition, it can realize the linkage control between the heat pump unit and the solar water storage tank 10, effectively utilize the hot water in the solar water storage tank 10, and avoid waste of resources.

[0068] It should be explained that the "standard water storage temperature" in step S2 above is a set temperature value. This temperature value can be obtained from the system default setting or set by the user, and it can be set to different values ​​according to different actual usage scenarios. This invention does not specifically limit the acquisition of the standard water storage temperature or its value. For example, the standard water storage temperature is 30℃.

[0069] According to some embodiments of the present invention, the steps of determining a first execution logic based on the outdoor ambient temperature and controlling the operation of the solenoid valve 7 according to the first execution logic specifically include:

[0070] When the outdoor ambient temperature is greater than or equal to the first set temperature, control solenoid valve 7 to close;

[0071] When the outdoor ambient temperature is lower than the first set temperature, control solenoid valve 7 to open.

[0072] In this embodiment, it can be understood that when the outdoor ambient temperature is greater than or equal to the first set temperature, it indicates that the outdoor ambient temperature is high. At this time, the outdoor heat exchanger 3, as the evaporator side, will not have the risk of its evaporation temperature dropping too much. Therefore, it is not necessary to open the solenoid valve 7, that is, it is not necessary to use the hot water branch 20 to heat the outdoor heat exchanger 3. However, when the outdoor ambient temperature is less than the first set temperature, it indicates that the outdoor ambient temperature is too low. At this time, the outdoor heat exchanger 3 has the risk of its evaporation temperature continuously decreasing during the evaporation process. Therefore, the controller will open the solenoid valve 7, so that the hot water in the solar water storage tank 10 that meets the conditions flows through the hot water branch 20 to the outdoor heat exchanger 3, thereby heating it and increasing its evaporation temperature, thus ensuring the heating effect of the unit.

[0073] It should be explained that the aforementioned first set temperature is a preset temperature value. This temperature value can be obtained from the system default settings or set by the user, and it can be set to different values ​​depending on the actual usage scenario. This invention does not specifically limit the acquisition of the first set temperature or its value. For example, the first set temperature can be zero.

[0074] According to some embodiments of the present invention, after the step of controlling the solenoid valve 7 to open when the outdoor ambient temperature is lower than the first set temperature, the control method of the heat pump unit further includes:

[0075] Adjust the opening degree of solenoid valve 7 according to the outdoor ambient temperature and / or water storage temperature.

[0076] In this embodiment, the lower the outdoor ambient temperature, the greater the temperature drop of the outdoor heat exchanger 3 during the evaporation process. Therefore, in order to ensure compensation for the heat loss of the outdoor heat exchanger 3 due to the outside temperature, the controller will control the opening of the solenoid valve 7 to increase, thereby increasing the hot water flow in the hot water branch 20, which means increasing the heat provided to heat the outdoor heat exchanger 3, and thus matching the current large temperature drop of the outdoor heat exchanger 3.

[0077] When the water storage temperature is lower, it means that the amount of heat provided by the unit volume of hot water in the hot water branch 20 to the outdoor heat exchanger 3 is smaller. In order to ensure that the heat lost by the outdoor heat exchanger 3 due to the outside temperature is compensated, the controller will control the opening of the solenoid valve 7 to increase, thereby increasing the hot water flow in the hot water branch 20. This will ensure that the heat provided by the hot water branch 20 to the outdoor heat exchanger 3 can be maintained at the original level, and prevent the temperature of the outdoor heat exchanger 3 from continuing to drop due to insufficient heat supply.

[0078] Furthermore, the steps for adjusting the opening degree of solenoid valve 7 according to the outdoor ambient temperature and / or water storage temperature specifically include:

[0079] When the water storage temperature is in the first temperature range, control solenoid valve 7 to be fully open;

[0080] When the water storage temperature is in the second temperature range, the opening degree of the solenoid valve 7 is controlled to change within the first opening degree range according to the range of the outdoor ambient temperature, and its opening degree is negatively correlated with the outdoor ambient temperature.

[0081] When the water storage temperature is in the third temperature range, the opening degree of the solenoid valve 7 is controlled to vary within the second opening degree range according to the range of the outdoor ambient temperature, and its opening degree is negatively correlated with the outdoor ambient temperature.

[0082] Among them, the minimum value in the first temperature range is greater than or equal to the standard storage water temperature, the second temperature range is greater than the first temperature range, the third temperature range is greater than the second temperature range, and the maximum value in the first opening range is less than the fully open opening, and the second opening range is less than the first opening range.

[0083] It is understood that in the above embodiments, as the water storage temperature decreases and the outdoor ambient temperature decreases, the opening degree of the solenoid valve 7 can gradually decrease, thereby increasing the flow rate in the hot water branch 20, increasing the evaporation temperature of the outdoor heat exchanger 3, and thus improving the heating effect of the unit.

[0084] It should be explained that the first temperature range, the second temperature range, and the third temperature range mentioned above are preset temperature ranges. These temperature ranges can be obtained by the system default settings or by user settings. Furthermore, these temperature ranges can be set to different numerical ranges according to different actual usage scenarios. This invention does not impose specific limitations on the acquisition of the above temperature ranges or their numerical values.

[0085] The first opening range, the second opening range, and the third opening range are described in the same way as the temperature ranges described above. To avoid repetition, they will not be repeated here.

[0086] According to some embodiments of the present invention, a water pump 6 is provided on the hot water branch 20. Then, after the step of controlling the solenoid valve 7 to open when the outdoor ambient temperature is lower than the first set temperature, the control method further includes:

[0087] Obtain the inlet and outlet water temperatures of hot water branch 20, and determine the temperature difference between the inlet and outlet water temperatures.

[0088] The second execution logic is determined based on the temperature difference, and the speed of water pump 6 is adjusted accordingly. The speed of water pump 6 is positively correlated with the temperature difference.

[0089] It is understandable that the temperature difference between the inlet water temperature and the outlet water temperature can reflect the heat exchange efficiency between the hot water and the outdoor heat exchanger 3.

[0090] For example, if the temperature difference is too small, that is, the heat lost by the hot water after heating the outdoor heat exchanger 3 is too small, it indicates that the flow rate of the hot water is too fast, which cannot guarantee that the hot water will fully heat the outdoor heat exchanger 3. Furthermore, since only a small portion of the heat of the hot water is used to heat the outdoor heat exchanger 3, 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 hot water branch 20, thereby facilitating the full heating of the outdoor heat exchanger 3 by the hot water and improving the energy utilization rate of the hot water.

[0091] For example, if the temperature difference is too large, that is, if the hot water loses too much heat after heating the outdoor heat exchanger 3, it indicates that the hot water flow rate is too slow. At this time, the hot water will stay in the hairpin tube 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 outdoor heat exchanger 3. 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 hot water branch 20, so as to ensure the heating effect of the hot water on the outdoor heat exchanger 3 and avoid the hot water losing its heating effect due to staying in the hairpin tube for too long.

[0092] In a specific embodiment of the present invention, the control method specifically includes:

[0093] Based on the temperature difference being within the first temperature difference range, the speed of water pump 6 is controlled to the first speed.

[0094] Based on the temperature difference being within the second temperature difference range, the speed of water pump 6 is controlled to the second speed.

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

[0096] 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.

[0097] According to some embodiments of the present invention, the solar water storage tank 10 is equipped with a heating device, or the indoor heat exchanger 5 of the heat pump unit is arranged opposite to the solar water storage tank 10 to heat it. After the step of controlling the solenoid valve 7 to open based on the outdoor ambient temperature being lower than a first set temperature, the control method further includes:

[0098] Obtain the rate of temperature change of the water temperature in the solar water storage tank 10 within a set time period;

[0099] If the temperature change rate is determined to be negative, control the heating device to turn on, or control the indoor heat exchanger 5 to heat the solar water storage tank 10.

[0100] It is understandable that when the hot water in the hot water branch 20 is heated by the indoor heat exchanger 5, its temperature will decrease. When the water flows back to the solar water storage tank 10, it will cause the water temperature (storage temperature) in the solar water storage tank 10 to decrease. If the storage temperature in the solar water storage tank 10 decreases too much, it will affect the subsequent heating process of the outdoor heat exchanger 3.

[0101] Therefore, in order to ensure that the water temperature in the solar water storage tank 10 can always be maintained at a high temperature level, in addition to solar heating, this method also introduces an external heat source to supplement the heating of the water in the solar water storage tank 10. Specifically, the controller will acquire and monitor the temperature change rate of the water in the solar water storage tank 10 within a set time. When the temperature change rate of the solar water storage tank 10 is negative, it proves that the water temperature in the solar water storage tank 10 is continuously decreasing. At this time, in order to ensure the stability of the water temperature in the solar water storage tank 10, the controller will control the heating device to turn on to heat the solar water storage tank 10, or control the indoor heat exchanger 5 to heat the solar water storage tank 10.

[0102] In this way, when the temperature change rate inside the solar water storage tank 10 is negative, the solar water storage tank 10 is heated by an external heat source, ensuring that the water temperature inside the solar water storage tank 10 is kept at a high temperature value, thereby ensuring the smooth progress of the subsequent heating process of the outdoor heat exchanger 3.

[0103] like Figure 4 As shown, according to some embodiments of the present invention, the heat pump unit further includes an inlet pipe 81, a hot water exchange pipe, and an outlet pipe 82 connected to each other. The indoor heat exchanger 5 heats the hot water exchange pipe to generate hot water. The outlet pipe 82 is connected to an auxiliary heating branch 83, which is connected to the hot water branch 20 and located upstream of the outdoor heat exchanger 3. The inlet of the hot water branch 20 is provided with a first control valve 91, and the auxiliary heating branch 83 is provided with a second control valve 92. The solenoid valve 7 is located downstream of the outdoor heat exchanger 3.

[0104] In this embodiment, it can be understood that the hot water flowing through the outdoor heat exchanger 3 in the hot water branch 20 has two sources: one is the hot water generated by the heat pump unit itself, and the other is the hot water in the solar water storage tank 10. Furthermore, since the inlet of the hot water branch 20 is equipped with a first control valve 91, and the auxiliary heating branch 83 is equipped with a second control valve 92, the supply ratio between the hot water from the heat pump unit and the hot water from the solar water storage tank 10 in the hot water branch 20 can be adjusted by controlling the first control valve 91 and the second control valve 92 respectively.

[0105] Furthermore, it is understood that since the hot water branch 20 will be disconnected and will no longer supply heat to the outdoor heat exchanger 3 when the solenoid valve 7 on the hot water branch 20 is disconnected, the opening and adjustment of the first control valve 91 and the second control valve 92 are only meaningful when the solenoid valve 7 on the hot water branch 20 is opened.

[0106] Based on the above-described device structure including the first control valve 91 and the second control valve 92, after the step of obtaining the water temperature in the solar water storage tank 10, the control method further includes:

[0107] If the water storage temperature is determined to be less than or equal to the standard water storage temperature, and the outdoor ambient temperature is less than the first set temperature, the first control valve 91 is closed, and the second control valve 92 and the solenoid valve 7 are opened.

[0108] In this embodiment, the hot water source in the hot water branch 20 comes only from the auxiliary heating branch 83, that is, the hot water generated by the heat pump unit itself. At this time, the hot water in the outlet pipe 82 of the heat pump unit is divided into two paths: one path supplies water to the user, and the other path enters the hot water branch 20 to heat the outdoor heat exchanger 3, thereby improving the heating effect of the unit.

[0109] In this way, although the water temperature in the solar water storage tank 10 is insufficient to heat the outdoor heat exchanger 3, the presence of the auxiliary heat branch 83 allows the outdoor heat exchanger 3 to increase its evaporation temperature by using the hot water generated by the heat pump unit itself, thereby improving the unit's heating effect.

[0110] Furthermore, the control methods for heat pump units also include:

[0111] Determine that the second control valve 92 and the solenoid valve 7 are open and the first control valve 91 is closed, and obtain the water temperature in the auxiliary heating branch 83;

[0112] Adjust the opening degree of the second control valve 92 and the solenoid valve 7 according to the water temperature in the auxiliary heating branch 83 and / or the outdoor ambient temperature.

[0113] In this embodiment, the lower the outdoor ambient temperature, the greater the temperature drop of the outdoor heat exchanger 3 during the evaporation process. Therefore, in order to ensure compensation for the heat loss of the outdoor heat exchanger 3 due to the outside temperature, the controller will control the opening of the second control valve 92 and the solenoid valve 7 to increase, thereby increasing the hot water flow in the hot water branch 20, which means increasing the heat provided to heat the outdoor heat exchanger 3, and thus matching the current large temperature drop of the outdoor heat exchanger 3.

[0114] When the water temperature in the auxiliary heating branch 83 is lower, it indicates that the amount of heat provided by the hot water per unit volume in the hot water branch 20 to the outdoor heat exchanger 3 is smaller. In order to ensure that the heat lost by the outdoor heat exchanger 3 due to the outside temperature is compensated, the controller will control the opening of the second control valve 92 and the solenoid valve 7 to increase, thereby increasing the hot water flow in the hot water branch 20. This will ensure that the heat provided by the hot water branch 20 to the outdoor heat exchanger 3 can be maintained at the original level, and prevent the temperature of the outdoor heat exchanger 3 from continuing to drop due to insufficient heat supply.

[0115] According to some embodiments of the present invention, after the step of obtaining the water temperature in the solar water storage tank 10, the control method further includes:

[0116] When the water storage temperature is higher than the standard water storage temperature and the outdoor ambient temperature is lower than the first set temperature, the first control valve 91, the second control valve 92 and the solenoid valve 7 are all opened.

[0117] The system determines that the first control valve 91, the second control valve 92, and the solenoid valve 7 are all open, obtains the water temperature in the auxiliary heating branch 83, and adjusts the opening degree of the first control valve 91 and the second control valve 92 according to the water storage temperature and the water temperature in the auxiliary heating branch 83.

[0118] In this embodiment, the hot water flowing through the outdoor heat exchanger 3 in the hot water branch 20 has two sources: one is the hot water generated by the heat pump unit itself, i.e., the hot water in the auxiliary heating branch 83, and the other is the hot water in the solar water storage tank 10. At this time, the controller can adjust the opening of the first control valve 91 and the second control valve 92 according to the water temperature in the auxiliary heating branch 83, i.e., adjust the supply ratio between the hot water from the heat pump unit and the hot water from the solar water storage tank 10 in the hot water branch 20.

[0119] For example, the steps of adjusting the opening of the first control valve 91 and the second control valve 92 according to the water storage temperature and the water temperature in the auxiliary heating branch 83 specifically include:

[0120] The opening degree of the first control valve 91 and the second control valve 92 is adjusted according to the temperature ratio between the water storage temperature and the water temperature in the auxiliary heating branch 83.

[0121] Specifically, the larger the temperature ratio between the water storage temperature and the water temperature in the auxiliary heating branch 83, the higher the water storage temperature is relative to the water temperature in the auxiliary heating branch 83. At this time, the opening of the first control valve 91 can be increased, thereby increasing the proportion of hot water from the solar water storage tank 10 in the hot water branch 20, and thus increasing the overall temperature of the hot water in the hot water branch 20, resulting in a better heating effect on the outdoor heat exchanger 3.

[0122] The smaller the temperature ratio between the water storage temperature and the water temperature in the auxiliary heating branch 83, the higher the water temperature in the auxiliary heating branch 83 is relative to the water storage temperature. At this time, the opening of the second control valve 92 can be increased, thereby increasing the proportion of hot water from the auxiliary heating branch 83 in the hot water branch 20, and thus increasing the overall temperature of the hot water in the hot water branch 20, resulting in a better heating effect on the outdoor heat exchanger 3.

[0123] Of course, the above embodiment is only one of the many embodiments of the present invention and does not constitute a specific limitation on the opening degree of the first control valve 91 and the second control valve 92.

[0124] like Figure 3 and Figure 4 As shown, a hot water device that links a heat pump unit and a solar water storage tank according to a second aspect embodiment of the present invention includes a heat pump unit and a solar water storage tank 10, and also includes a control device 40 for the heat pump unit.

[0125] The heat pump unit 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 by refrigerant pipes. It also includes an inlet water pipe 81, a hot water exchange pipe, and an outlet water pipe 82, which are connected in sequence. The hot water exchange pipe is arranged opposite to the indoor heat exchanger 5 to exchange heat.

[0126] The solar water storage tank 10 is connected to a hot water branch line 20 equipped with a solenoid valve 7. The hot water branch line 20 flows through the outdoor heat exchanger 3 of the heat pump unit to heat it.

[0127] The control device 40 is used to execute the control method of the heat pump unit described in the first aspect embodiment above. The control device 40 can be installed on the heat pump unit 30 (e.g., Figure 2 (As shown), it can also be set up independently of the heat pump unit 30 and the solar water storage tank 10.

[0128] According to the second aspect of the present invention, a device linking a heat pump unit and a solar water storage tank is provided. A hot water branch 20 is drawn from the solar water storage tank 10 and flows through the outdoor heat exchanger 3 of the heat pump unit. In a low-temperature environment, the solenoid valve 7 is controlled to open so that hot water flows into the hot water branch 20 and heats the outdoor heat exchanger 3, thereby increasing the evaporation temperature of the outdoor heat exchanger 3, thereby improving the heating effect of the unit and ensuring the user's experience.

[0129] like Figure 4 As shown, according to some embodiments of the present invention, the outlet pipe 82 is connected to an auxiliary heating branch 83, the auxiliary heating branch 83 is connected to the hot water branch 20 and is located upstream of the outdoor heat exchanger 3, the inlet of the hot water branch 20 is provided with a first control valve 91, the auxiliary heating branch 83 is provided with a second control valve 92, and the solenoid valve 7 is located downstream of the outdoor heat exchanger 3.

[0130] Figure 5 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 5 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 unit, including determining that the heat pump unit is in heating mode and obtaining the water temperature in the solar water storage tank 10; if the water temperature is higher than the standard water temperature, obtaining the outdoor ambient temperature; determining a first execution logic based on the outdoor ambient temperature, and controlling the operation of the solenoid valve 7 according to the first execution logic to achieve temperature control of the outdoor heat exchanger 3 of the heat pump unit.

[0131] 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.

[0132] 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 unit, including determining that the heat pump unit is in heating mode and obtaining the water temperature in the solar water storage tank 10; obtaining the outdoor ambient temperature when the water temperature is higher than the standard water temperature; determining a first execution logic based on the outdoor ambient temperature, and controlling the action of the solenoid valve 7 based on the first execution logic to achieve temperature control of the outdoor heat exchanger 3 of the heat pump unit.

[0133] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When executed by a processor, the computer program implements a control method for a heat pump unit, including determining that the heat pump unit is in heating mode and obtaining the water temperature in the solar water storage tank 10; if the water temperature is higher than the standard water temperature, obtaining the outdoor ambient temperature; determining a first execution logic based on the outdoor ambient temperature, and controlling the action of the solenoid valve 7 based on the first execution logic to achieve temperature control of the outdoor heat exchanger 3 of the heat pump unit.

[0134] 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.

[0135] 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.

[0136] 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 unit, characterized in that, The outdoor heat exchanger of the heat pump unit is connected to the solar water storage tank via a hot water branch equipped with a solenoid valve. The control method includes: Determine that the heat pump unit is in heating mode and obtain the water temperature in the solar water storage tank; When the water storage temperature is higher than the standard water storage temperature, the outdoor ambient temperature is obtained; The first execution logic is determined based on the outdoor ambient temperature, and the operation of the solenoid valve is controlled according to the first execution logic to achieve temperature control of the outdoor heat exchanger of the heat pump unit, specifically including: When the outdoor ambient temperature is greater than or equal to the first set temperature, the solenoid valve is controlled to close. When the outdoor ambient temperature is lower than the first set temperature, the solenoid valve is opened to heat the outdoor heat exchanger of the heat pump unit. A water pump is installed on the hot water branch line; After the step of controlling the solenoid valve to open when the outdoor ambient temperature is lower than the first set temperature, the method further includes: Obtain the inlet and outlet water temperatures of the hot water branch, and determine the temperature difference between the inlet and outlet water temperatures; The second execution logic is determined based on the temperature difference, and the speed of the water pump is adjusted according to the second execution logic; The rotational speed of the water pump is positively correlated with the temperature difference.

2. The control method for a heat pump unit according to claim 1, characterized in that, After the step of controlling the solenoid valve to open when the outdoor ambient temperature is lower than the first set temperature, the method further includes: The opening degree of the solenoid valve is adjusted according to the outdoor ambient temperature and / or the water storage temperature.

3. The control method for a heat pump unit according to claim 2, characterized in that, The step of adjusting the opening degree of the solenoid valve according to the outdoor ambient temperature and / or the water storage temperature specifically includes: When the water storage temperature is within the first temperature range, the solenoid valve is fully opened. When the water storage temperature is in the second temperature range, the opening degree of the solenoid valve is controlled to vary within the first opening degree range according to the range of the outdoor ambient temperature, and its opening degree is negatively correlated with the outdoor ambient temperature. When the water storage temperature is in the third temperature range, the opening degree of the solenoid valve is controlled to vary within the second opening degree range according to the range of the outdoor ambient temperature, and its opening degree is negatively correlated with the outdoor ambient temperature. Wherein, the minimum value in the first temperature range is greater than or equal to the standard water storage temperature, the second temperature range is greater than the first temperature range, the third temperature range is greater than the second temperature range, and the maximum value of the first opening range is less than the fully open opening, and the second opening range is less than the first opening range.

4. The control method for a heat pump unit according to claim 1, characterized in that, The solar water storage tank is equipped with a heating device, or the indoor heat exchanger of the heat pump unit is arranged opposite to the solar water storage tank to heat it; After the step of controlling the solenoid valve to open when the outdoor ambient temperature is lower than the first set temperature, the method further includes: The rate of temperature change of the water temperature in the solar water storage tank within a set time period is obtained; When the rate of temperature change is negative, the heating device is controlled to turn on and heat the solar water storage tank, or the indoor heat exchanger is controlled to heat the solar water storage tank.

5. The control method for a heat pump unit according to any one of claims 1 to 4, characterized in that, The heat pump unit also includes an inlet pipe, a hot water exchange pipe, and an outlet pipe that are connected to each other. The indoor heat exchanger heats the hot water exchange pipe to produce hot water. The outlet pipe is connected to an auxiliary heat branch. The auxiliary heat branch is connected to the hot water branch and is located upstream of the outdoor heat exchanger. The inlet of the hot water branch is equipped with a first control valve. The auxiliary heat branch is equipped with a second control valve. The solenoid valve is located downstream of the outdoor heat exchanger. After the step of obtaining the water temperature in the solar water storage tank, the method further includes: When the water storage temperature is less than or equal to the standard water storage temperature and the outdoor ambient temperature is less than the first set temperature, the first control valve is closed, and the second control valve and the solenoid valve are opened.

6. The control method for a heat pump unit according to claim 5, characterized in that, Also includes: Determine that the second control valve and the solenoid valve are open and the first control valve is closed, and obtain the water temperature in the auxiliary heating branch; Adjust the opening degree of the second control valve and the solenoid valve according to the water temperature in the auxiliary heating branch and / or the outdoor ambient temperature.

7. The control method for a heat pump unit according to claim 5, characterized in that, After the step of obtaining the water temperature in the solar water storage tank, the method further includes: When the water storage temperature is higher than the standard water storage temperature and the outdoor ambient temperature is lower than the first set temperature, the first control valve, the second control valve, and the solenoid valve are all opened. The system determines that the first control valve, the second control valve, and the solenoid valve are all open, obtains the water temperature in the auxiliary heating branch, and adjusts the opening degree of the first control valve and the second control valve according to the water storage temperature and the water temperature in the auxiliary heating branch.

8. A hot water device, characterized in that, include: A heat pump unit, comprising an indoor heat exchanger and an outdoor heat exchanger; A solar water storage tank is connected to a hot water branch line equipped with a solenoid valve. The hot water from the hot water branch line flows through the outdoor heat exchanger of the heat pump unit to heat it. A control device for performing the heat pump unit control method according to any one of claims 1-7.

9. The hot water equipment according to claim 8, characterized in that, The heat pump unit also includes an inlet pipe, a hot water exchange pipe, and an outlet pipe connected in sequence. The hot water exchange pipe is arranged opposite to the indoor heat exchanger to exchange heat. The outlet pipe is connected to an auxiliary heating branch, which is connected to the hot water branch and located upstream of the outdoor heat exchanger. The inlet of the hot water branch is equipped with a first control valve, and the auxiliary heating branch is equipped with a second control valve. The solenoid valve is located downstream of the outdoor heat exchanger.

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