Control method of heat pump unit and hot water equipment

Abstract

The invention provides a control method of a heat pump unit and hot water equipment. An outdoor heat exchanger of the heat pump unit is connected with the solar water storage tank through a hot water branch provided with an electromagnetic valve; the control method comprises the steps that it is determined that the heat pump unit is in a heating mode, and the water storage temperature in the solar water storage tank is obtained; under the condition that the water storage temperature is higher than the standard water storage temperature, the outdoor environment temperature is obtained; and first execution logic is determined according to the outdoor environment temperature, and action of an electromagnetic valve is controlled according to the first execution logic, so that temperature control over an outdoor heat exchanger is achieved. According to the control method of the heat pump unit and the hot water equipment, the evaporation temperature of the outdoor heat exchanger can be increased, then the heating effect of the unit is improved, the use experience of a user is guaranteed, and linkage control between the heat pump unit and the solar water storage tank is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of electrical appliances, and in particular to a control method for a heat pump unit and a hot water device. Background Art

[0002] In the related technologies, with the current expansion of the heat pump water heater market and the popularization of products, the heating performance of heat pump water heaters has attracted much attention. When the water heater unit is heating at a low outdoor ambient temperature, the outdoor condenser evaporation temperature is relatively low, resulting in a decrease in the system heating capacity. In addition, in the homes of users who have installed solar energy devices, since the solar energy devices and heat pump units work independently, there is a lack of linkage between the two, and thus the advantages of the linkage between the two cannot be brought into play. Summary of the invention

[0003] The present invention provides a control method for a heat pump unit and a hot water device, which are used to solve the defects in the prior art and achieve the following technical effects: the evaporation temperature of an outdoor heat exchanger is increased, 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 the control method of the heat pump unit of the first embodiment of the present invention, the outdoor heat exchanger of the heat pump unit is connected to the solar water storage tank through a hot water branch provided with a solenoid valve;

[0005] The control method comprises:

[0006] Determining that the heat pump unit is in a heating mode, and obtaining the water temperature in the solar water storage tank;

[0007] When the water storage temperature is higher than the standard water storage temperature, obtaining the outdoor environment temperature;

[0008] A first execution logic is determined according to the outdoor ambient temperature, and the action 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 a first execution logic according to the outdoor ambient temperature and controlling the action of the solenoid valve according to the first execution logic specifically includes:

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

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

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

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

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

[0015] When the water storage temperature is within the first temperature range, controlling the solenoid valve to be fully opened;

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

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

[0018] Among them, the minimum value in the first temperature interval is greater than or equal to the standard water storage temperature, the second temperature interval is greater than the first temperature interval, the third temperature interval is greater than the second temperature interval, 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;

[0020] When the outdoor environment temperature is lower than the first set temperature, after the step of controlling the solenoid valve to open, the method further includes:

[0021] Obtaining the inlet water temperature and the outlet water temperature of the hot water branch, and determining the temperature difference between the inlet water temperature and the outlet water temperature;

[0022] determining a second execution logic according to the temperature difference, and adjusting the rotation speed of the water pump according to the second execution logic;

[0023] Wherein, the rotation speed of the water pump is positively correlated with the temperature difference.

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

[0025] When the outdoor environment temperature is lower than the first set temperature, after the step of controlling the solenoid valve to open, the method further includes:

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

[0027] Determine that the temperature change rate is a negative value, control the heating device to start and heat the solar water tank, or control the indoor heat exchanger to heat the solar water tank.

[0028] According to one embodiment of the present invention, the heat pump unit further comprises an inlet pipe, a hot water exchange pipe and a water outlet pipe which are interconnected, the indoor heat exchanger heats the hot water exchange pipe to produce hot water, the water 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, a first control valve is provided at the water inlet of the hot water branch, a second control valve is provided on the auxiliary heat branch, and 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 controlled to be closed, and the second control valve and the solenoid valve are controlled to be 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] The openings of the second control valve and the solenoid valve are adjusted 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 controlled to be open;

[0036] Determine that the first control valve, the second control valve and the solenoid valve are all open, obtain the water temperature in the auxiliary heating branch, and adjust the opening 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 water heating device according to a second aspect of the present invention comprises:

[0038] A heat pump unit, 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;

[0039] A solar water storage tank is connected to a hot water branch provided with a solenoid valve, and the hot water branch flows through the outdoor heat exchanger of the heat pump unit to heat it;

[0040] A control device for a heat pump unit according to the embodiment of the first aspect of the present invention is implemented.

[0041] According to one embodiment of the present invention, the heat pump unit also includes a water inlet pipe, a hot water exchange pipe and a water outlet pipe connected in sequence, the hot water exchange pipe is arranged opposite to the indoor heat exchanger for heat exchange; the water 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, a first control valve is provided at the water inlet of the hot water branch, a second control valve is provided on the auxiliary heat branch, and the solenoid valve is located downstream of the outdoor heat exchanger.

[0042] The present invention provides a control method for a heat pump unit, which leads a hot water branch from a solar water tank to flow through an outdoor heat exchanger of the heat pump unit. After the water temperature in the solar water tank meets the conditions, 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 controlled to open so that hot water flows into the hot water branch and heats the outdoor heat exchanger, thereby increasing the evaporation temperature of the outdoor heat exchanger, thereby improving the heating effect of the unit and ensuring the user experience.

[0043] In addition, linkage control between the heat pump unit and the solar water tank can be achieved, effectively utilizing the hot water in the solar water tank and avoiding waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] 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.

[0045] Figure 1 It is a schematic flow chart of a control method of a heat pump unit provided by the present invention;

[0046] Figure 2 It is a schematic diagram of the overall structure of the water heating device provided by the present invention;

[0047] Figure 3is a schematic structural diagram of a water heating device provided by an embodiment of the present invention;

[0048] Figure 4 is a schematic structural diagram of a water heating device provided by another embodiment of the present invention;

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

[0050] Reference numerals:

[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. Water inlet pipe; 82. Water 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 DESCRIPTION

[0052] 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.

[0053] The control method, control device, and equipment for linking a heat pump unit and a solar water tank proposed in the present invention are described below with reference to the accompanying drawings. Before describing the embodiments of the present invention in detail, the entire application scenario is described first. The control method, control device, electronic device, and computer-readable storage medium of the heat pump unit of the embodiments of the present invention can be applied to the air conditioner locally, to the cloud platform in the Internet field, or to other types of cloud platforms in the Internet field, or to third-party devices. Third-party devices may include various types such as mobile phones, tablet computers, notebooks, car computers, and other smart terminals.

[0054] The following description only takes the control method applicable to a heat pump unit as an example. It should be understood that the control method of the embodiment of the present invention can also be applied to a cloud platform and third-party equipment.

[0055] It should also be noted that the air conditioner control method proposed in the present invention is targeted, that is, the method is applicable to the working scenario of the heat pump unit operating in the heating mode. In addition, the control method is based on the hot water device that is linked to the heat pump unit and the solar water storage tank. The structure of the hot water device is as follows: Figure 3 and Figure 4 As shown, the solar water storage tank 10 is connected to a hot water branch 20 provided with a solenoid valve 7, and the hot water branch 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 embodiment of the present invention includes:

[0057] Step S1, determining that the heat pump unit is in heating mode, and obtaining the water temperature in the solar water storage tank 10;

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

[0059] Step S3, determining a first execution logic according to the outdoor ambient temperature, and controlling the action 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 in an embodiment of the present invention, the specific working process is as follows: first, when the heat pump unit and the solar water tank 10 are both started and operated, 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 temperature of the water stored in the solar water tank 10.

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

[0062] From the above, only when the controller determines that the current water storage temperature in the solar water tank 10 is greater than the standard water storage temperature, the controller will further execute the next step, that is, further obtain the specific size of the outdoor ambient temperature, and according to the size of 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 can be understood 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 the evaporation side, as the heating process continues, the evaporation temperature of the outdoor heat exchanger 3 will become lower and lower, and thus the heating capacity of the heat pump unit will also become lower and lower. If the outdoor ambient temperature is normal, at this time, as the heating process continues to operate, the evaporation temperature of the outdoor heat exchanger 3 can be maintained at a normal level, thereby ensuring that the heating capacity of the heat pump unit is normal.

[0064] As described above, in step S3, the controller will analyze and judge 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 has the risk of having an evaporation temperature that is getting lower and lower at this time, in order to avoid the adverse effects of the above-mentioned outdoor ambient temperature being too low 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, the 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 achieving an improvement in the heating effect of the unit and ensuring the user's experience.

[0065] In the related technologies, with the current expansion of the heat pump water heater market and the popularization of products, the heating performance of heat pump water heaters has attracted much attention. When the water heater unit is heating at a low outdoor ambient temperature, the outdoor condenser evaporation temperature is relatively low, resulting in a decrease in the system heating capacity. In addition, in the homes of users who have installed solar energy devices, since the solar energy devices and heat pump units work independently, there is a lack of linkage between the two, and thus the advantages of the linkage between the two cannot be brought into play.

[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, wherein a hot water branch 20 is drawn out from the solar water tank 10 to flow through the outdoor heat exchanger 3 of the heat pump unit, and after the water temperature in the solar water 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 size of 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 achieving an improvement in the heating effect of the unit and ensuring the user experience.

[0067] In addition, linkage control between the heat pump unit and the solar water storage tank 10 can be achieved, which effectively utilizes the hot water in the solar water storage tank 10 and avoids waste of resources.

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

[0069] According to some embodiments of the present invention, the step of determining the first execution logic according to the outdoor ambient temperature and controlling the action of the solenoid valve 7 according to the first execution logic specifically includes:

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

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

[0072] In the present embodiment, it can be understood that when the outdoor ambient temperature is greater than or equal to the first set temperature, it proves that the outdoor ambient temperature is relatively high. At this time, the outdoor heat exchanger 3 acts as the evaporation side, and its evaporation temperature does not have the risk of being reduced too much. Therefore, there is no need to open the solenoid valve 7 at this time, that is, there is no need to use the hot water branch 20 to heat the outdoor heat exchanger 3; and when the outdoor ambient temperature is lower than the first set temperature, it proves that the outdoor ambient temperature is too low. At this time, the outdoor heat exchanger 3 has the risk of the evaporation temperature continuously decreasing during the evaporation process. Therefore, the controller will open the solenoid valve 7, so that the qualified hot water in the solar water tank 10 flows through the outdoor heat exchanger 3 through the hot water branch 20, thereby heating it and increasing its evaporation temperature, thereby ensuring the heating effect of the unit.

[0073] It should be explained that the first set temperature is a preset temperature value, which can be obtained by the system default setting or by the user setting, and the temperature value can be set to different values ​​according to different actual usage scenarios. The present invention does not specifically limit the acquisition of the first set temperature and its value. For example, the first set temperature can be zero.

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

[0075] The opening degree of the solenoid valve 7 is adjusted according to the outdoor ambient temperature and / or the stored water temperature.

[0076] In this embodiment, the lower the outdoor ambient temperature is, the greater the amount of cooling of the outdoor heat exchanger 3 during the evaporation process. Therefore, in order to ensure compensation for the heat lost by the outdoor heat exchanger 3 due to the external 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, that is, increasing the heat provided for heating the outdoor heat exchanger 3, thereby matching the current large amount of cooling of the outdoor heat exchanger 3.

[0077] When the water storage temperature is lower, it means that the heat provided by the unit volume of hot water in the hot water branch 20 to the outdoor heat exchanger 3 is smaller. At this time, in order to ensure compensation for the heat loss of the outdoor heat exchanger 3 due to the external 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, so that the heat provided by the hot water branch 20 to the outdoor heat exchanger 3 can be maintained at the original level, avoiding the temperature of the outdoor heat exchanger 3 from continuing to drop due to insufficient heat supply.

[0078] Furthermore, the step of adjusting the opening of the solenoid valve 7 according to the outdoor ambient temperature and / or the stored water temperature specifically includes:

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

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

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

[0082] Among them, the minimum value in the first temperature interval is greater than or equal to the standard water storage temperature, the second temperature interval is greater than the first temperature interval, the third temperature interval is greater than the second temperature interval, 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.

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

[0084] It should be explained that the above-mentioned first temperature interval, second temperature interval and third temperature interval are pre-set temperature intervals, which can be obtained by the system default settings or by user settings, and the temperature intervals can be set to different numerical ranges according to different actual usage scenarios. The present invention does not specifically limit the acquisition of the above-mentioned temperature intervals and their numerical values.

[0085] The first opening range, the second opening range and the third opening range are the same as the description of the above temperature range, and to avoid repetition, the present invention 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. When the outdoor ambient temperature is lower than the first set temperature, after the step of controlling the solenoid valve 7 to open, the control method further includes:

[0087] Obtaining the inlet water temperature and the outlet water temperature of the hot water branch 20, and determining the temperature difference between the inlet water temperature and the outlet water temperature;

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

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

[0090] For example, when 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 means that the flow rate of the hot water is too fast, and it is impossible to ensure that the hot water can fully heat the outdoor heat exchanger 3. Moreover, since only a small part of the heat of the hot water is used to heat the outdoor heat exchanger 3, most of its heat cannot be fully utilized, so its energy utilization rate is extremely low. Therefore, it is necessary to reduce the rotation speed of the water pump 6 at this time, thereby reducing the flow rate of the hot water in the hot water branch 20, so as to facilitate the full heating of the outdoor heat exchanger 3 by the hot water and improve the energy utilization rate of the hot water.

[0091] For another example, when the temperature difference is too large, that is, the heat lost by the hot water after heating the outdoor heat exchanger 3 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 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 outdoor heat exchanger 3 is poor. It can be seen from the above 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 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 the 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] 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;

[0094] 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;

[0095] 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.

[0096] 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.

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

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

[0099] Determine that the temperature change rate is a negative value, control the heating device to start, or control the indoor heat exchanger 5 to heat the solar water storage tank 10.

[0100] It can be understood that when the hot water in the hot water branch 20 is heated by the indoor heat exchanger 5, its temperature will decrease. After the water flows back to the solar water tank 10, the water temperature (water storage temperature) in the solar water tank 10 will decrease. At this time, if the water storage temperature in the solar water 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 tank 10 can always be maintained at a relatively high temperature level, on the basis of solar heating, the method also introduces an external heat source to supplement the heating of the water in the solar water tank 10. Specifically, the controller will obtain and monitor the temperature change rate of the water temperature in the solar water tank 10 within a set time period. When the temperature change rate in the solar water tank 10 is a negative value, it proves that the water temperature in the solar water tank 10 has been continuously decreasing. At this time, in order to ensure the stability of the water temperature in the solar water tank 10, the controller will control the heating device to turn on to heat the solar water tank 10, or control the indoor heat exchanger 5 to heat the solar water tank 10.

[0102] In this way, by using an external heat source to heat the solar water tank 10 when the temperature change rate in the solar water tank 10 is negative, the water temperature in the solar water tank 10 is ensured to be maintained at a higher 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 also includes an interconnected water inlet pipe 81, a hot water exchange pipe and a water outlet pipe 82. The indoor heat exchanger 5 heats the hot water exchange pipe to produce hot water. The water outlet pipe 82 is connected to an auxiliary heat branch 83. The auxiliary heat branch 83 is connected to the hot water branch 20 and is located upstream of the outdoor heat exchanger 3. A first control valve 91 is provided at the water inlet of the hot water branch 20, a second control valve 92 is provided on the auxiliary heat branch 83, and the solenoid valve 7 is located downstream of the outdoor heat exchanger 3.

[0104] In the present embodiment, it can be understood that the hot water in the hot water branch 20 flowing through the outdoor heat exchanger 3 has two sources, one is the hot water generated by the heating of the heat pump unit itself, and the other is the hot water from the solar water storage tank 10. In addition, since the water inlet of the hot water branch 20 is provided with a first control valve 91, and the auxiliary heat branch 83 is provided 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] In addition, it can be understood that when the solenoid valve 7 on the hot water branch 20 is disconnected, the hot water branch 20 will be disconnected and will no longer supply heat to the outdoor heat exchanger 3. Therefore, the opening and opening degree adjustment of the first control valve 91 and the second control valve 92 will only be meaningful when the solenoid valve 7 on the hot water branch 20 is opened.

[0106] Based on the above-mentioned 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] Determine that 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, control the first control valve 91 to close, and control the second control valve 92 and the solenoid valve 7 to open.

[0108] In this embodiment, the hot water in the hot water branch 20 comes only from the auxiliary heat branch 83, that is, the hot water generated by the heat pump unit itself. At this time, the hot water in the water 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 tank 10 is not enough to heat the outdoor heat exchanger 3, due to the existence of the auxiliary heat branch 83, the outdoor heat exchanger 3 can use the hot water generated by the heat pump unit itself to increase the evaporation temperature, thereby improving the heating effect of the unit.

[0110] Furthermore, the control method of the heat pump unit also includes:

[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] The openings of the second control valve 92 and the solenoid valve 7 are adjusted 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 is, the greater the amount of cooling of the outdoor heat exchanger 3 during the evaporation process. Therefore, in order to ensure compensation for the heat lost by the outdoor heat exchanger 3 due to the external temperature, the controller will control the second control valve 92 and the solenoid valve 7 to increase their openings, thereby increasing the hot water flow in the hot water branch 20, that is, increasing the heat provided for heating the outdoor heat exchanger 3, thereby matching the current large amount of cooling of the outdoor heat exchanger 3.

[0114] When the water temperature in the auxiliary heat branch 83 is lower, it means that the heat provided by the unit volume of hot water in the hot water branch 20 to the outdoor heat exchanger 3 is smaller. At this time, in order to ensure compensation for the heat loss of the outdoor heat exchanger 3 due to the external temperature, the controller will control the second control valve 92 and the solenoid valve 7 to increase the opening, thereby increasing the hot water flow in the hot water branch 20, so that the heat provided by the hot water branch 20 to the outdoor heat exchanger 3 can be maintained at the original level, avoiding 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 controlled to be open;

[0117] Make sure that the first control valve 91 , the second control valve 92 and the solenoid valve 7 are all open, obtain the water temperature in the auxiliary heating branch 83 , and adjust 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 .

[0118] In this embodiment, the hot water in the hot water branch 20 flowing through the outdoor heat exchanger 3 has two sources, one is the hot water generated by the heating of the heat pump unit itself, that is, the hot water in the auxiliary heating branch 83, and the other is the hot water from 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 storage temperature and the water temperature in the auxiliary heating branch 83, that is, 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 step 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 heat branch 83 specifically includes:

[0120] The openings of the first control valve 91 and the second control valve 92 are adjusted according to the temperature ratio between the water storage temperature and the water temperature in the auxiliary heat branch 83 .

[0121] Specifically, the larger the temperature ratio between the water storage temperature and the water temperature in the auxiliary heating branch 83 is, 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, thereby increasing the overall temperature of the hot water in the hot water branch 20, and achieving a better heating effect on the outdoor heat exchanger 3.

[0122] When the temperature ratio between the water storage temperature and the water temperature in the auxiliary heating branch 83 is smaller, it proves that the water temperature in the auxiliary heating branch 83 is higher than 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 then increasing the overall temperature of the hot water in the hot water branch 20, which has a better heating effect on the outdoor heat exchanger 3.

[0123] Of course, the above embodiment is only one of 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, the hot water device of the linkage of the heat pump unit and the solar water tank according to the second embodiment of the present invention comprises a heat pump unit and a solar water tank 10, and also comprises a control device 40 of 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 a refrigerant pipeline, and also includes a water inlet pipe 81, a hot water exchange pipe and a water outlet pipe 82 which are connected in sequence. The hot water exchange pipe is arranged relative to the indoor heat exchanger 5 to exchange heat.

[0126] The solar water storage tank 10 is connected to a hot water branch 20 provided with a solenoid valve 7 , and the hot water branch 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 embodiment. The control device 40 can be installed on the heat pump unit 30 (such as Figure 2 As shown), it can also be set independently of the heat pump unit 30 and the solar water storage tank 10.

[0128] According to the device of the heat pump unit and the solar water tank linkage in the second aspect of the embodiment of the present invention, a hot water branch 20 is drawn from the solar water tank 10 to flow 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 achieving an improvement in the heating effect of the unit and ensuring the user experience.

[0129] like Figure 4 As shown, according to some embodiments of the present invention, the water outlet pipe 82 is connected to the auxiliary heat branch 83, the auxiliary heat branch 83 is connected to the hot water branch 20 and is located upstream of the outdoor heat exchanger 3, the water inlet of the hot water branch 20 is provided with a first control valve 91, the auxiliary heat 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 of a physical structure diagram of an electronic device is shown in FIG. Figure 5 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 unit, including determining that the heat pump unit is in the heating mode, obtaining the water storage temperature in the solar water storage tank 10; obtaining the outdoor environment temperature when the water storage temperature is higher than the standard water storage temperature; determining the first execution logic according to the outdoor environment temperature, and controlling the action of the solenoid valve 7 according to the first execution logic to realize the temperature control of the outdoor heat exchanger 3 of the heat pump unit.

[0131] 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.

[0132] 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 unit, including determining that the heat pump unit is in a heating mode, and obtaining the water storage temperature in the solar water tank 10; when 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 7 according to the first execution logic to achieve temperature control of the outdoor heat exchanger 3 of the heat pump unit.

[0133] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, a control method for a heat pump unit is implemented, including determining that the heat pump unit is in a heating mode, obtaining the water storage temperature in the solar water tank 10; when 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 7 according to 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, 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.

[0135] 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.

[0136] 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 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 through a hot water branch provided with a solenoid valve; The control method comprises: Determining that the heat pump unit is in a heating mode, and obtaining the water temperature in the solar water storage tank; When the water storage temperature is higher than the standard water storage temperature, obtaining the outdoor environment temperature; A first execution logic is determined according to the outdoor ambient temperature, and the action 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.

2. The control method of the heat pump unit according to claim 1, characterized in that: The step of determining the first execution logic according to the outdoor ambient temperature and controlling the action of the solenoid valve according to the first execution logic specifically includes: When the outdoor ambient temperature is greater than or equal to a first set temperature, controlling the solenoid valve to close; When the outdoor ambient temperature is lower than the first set temperature, the solenoid valve is controlled to open so as to heat the outdoor heat exchanger of the heat pump unit.

3. The control method of the heat pump unit according to claim 2, characterized in that: When the outdoor environment temperature is lower than the first set temperature, after the step of controlling the solenoid valve to open, the method further includes: The opening of the solenoid valve is adjusted according to the outdoor ambient temperature and / or the stored water temperature.

4. The control method of the heat pump unit according to claim 3, characterized in that: The step of adjusting the opening of the solenoid valve according to the outdoor ambient temperature and / or the stored water temperature specifically includes: When the water storage temperature is within the first temperature range, controlling the solenoid valve to be fully opened; When the water storage temperature is in the second temperature interval, the opening of the solenoid valve is controlled to change within the first opening range according to the interval range of the outdoor ambient temperature, and the opening is negatively correlated with the outdoor ambient temperature; When the water storage temperature is in the third temperature interval, the opening of the solenoid valve is controlled to change within a second opening range according to the interval range of the outdoor ambient temperature, and the opening is negatively correlated with the outdoor ambient temperature; Among them, the minimum value in the first temperature interval is greater than or equal to the standard water storage temperature, the second temperature interval is greater than the first temperature interval, the third temperature interval is greater than the second temperature interval, 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.

5. The control method of the heat pump unit according to claim 2, characterized in that: The hot water branch is provided with a water pump; When the outdoor environment temperature is lower than the first set temperature, after the step of controlling the solenoid valve to open, the method further includes: Obtaining the inlet water temperature and the outlet water temperature of the hot water branch, and determining the temperature difference between the inlet water temperature and the outlet water temperature; determining a second execution logic according to the temperature difference, and adjusting the rotation speed of the water pump according to the second execution logic; Wherein, the rotation speed of the water pump is positively correlated with the temperature difference.

6. The control method of the heat pump unit according to claim 2, characterized in that: 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; When the outdoor environment temperature is lower than the first set temperature, after the step of controlling the solenoid valve to open, the method further includes: Obtaining the temperature change rate of the water temperature in the solar water storage tank within a set time period; When the temperature change rate is a negative value, the heating device is controlled to start and heat the solar water tank, or the indoor heat exchanger is controlled to heat the solar water tank.

7. The control method of the heat pump unit according to any one of claims 2 to 6, characterized in that: The heat pump unit further comprises an inlet pipe, a hot water exchange pipe and an outlet pipe which are interconnected, 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, a first control valve is provided at the water inlet of the hot water branch, a second control valve is provided on the auxiliary heat branch, and 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 controlled to be closed, and the second control valve and the solenoid valve are controlled to be opened.

8. The control method of the heat pump unit according to claim 7, 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; The openings of the second control valve and the solenoid valve are adjusted according to the water temperature in the auxiliary heating branch and / or the outdoor ambient temperature.

9. The control method of the heat pump unit according to claim 7, 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 controlled to be open; Determine that the first control valve, the second control valve and the solenoid valve are all open, obtain the water temperature in the auxiliary heating branch, and adjust the opening 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.

10. A water heating device, characterized in that: include: A heat pump unit, the 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 provided with a solenoid valve, and hot water in the hot water branch flows through the outdoor heat exchanger of the heat pump unit to heat it; A control device, wherein the control device is used to execute the heat pump unit control method described in claims 1-9.

11. The water heating device according to claim 10, characterized in that: The heat pump unit also includes a water inlet pipe, a water exchange pipe and a water outlet pipe connected in sequence, and the water exchange pipe is arranged opposite to the indoor heat exchanger to exchange heat; The water outlet pipe is connected to an auxiliary heat branch, which is connected to the hot water branch and located upstream of the outdoor heat exchanger. A first control valve is provided at the water inlet of the hot water branch, and a second control valve is provided on the auxiliary heat branch. The solenoid valve is located downstream of the outdoor heat exchanger.

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