Double-water-tank water heater, control method, storage medium and electronic equipment

Abstract

The invention discloses a double-water-tank water heater, a control method, a storage medium and electronic equipment. The double-water-tank water heater comprises a heat pump unit, a heating water tank, a heat preservation water tank and a solar heat collector. The water outlet end of the heat pump unit is communicated with the first water inlet of the heating water tank, and the water inlet of the heat pump unit is communicated with the first water outlet of the heating water tank; a first water inlet of the heat preservation water tank is communicated with a second water outlet of the heating water tank, a first water outlet of the heat preservation water tank is communicated with a user water outlet end, and a second water outlet of the heat preservation water tank is communicated with a second water inlet of the heating water tank; the water outlet end of the solar heat collector is communicated with the third water inlet of the heating water tank, and the water inlet of the solar heat collector is communicated with the third water outlet of the heating water tank. According to the invention, when the heating triggering temperature of the heat preservation water tank is set to be low, heating can be quickly completed, the heating time is shortened, and the hot water outlet speed is ensured, so that the water outlet speed and the energy efficiency are both considered.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange units, and in particular to a double-tank water heater, a control method, a storage medium and an electronic device. Background Art

[0002] Existing dual-tank water heaters generally use an insulated water tank and a heating water tank, and circulate and heat the insulated water tank and the heating water tank respectively through a heat pump unit. On the one hand, if the heating start temperature of the insulated water tank is relatively low, the heating time will be relatively long, and hot water cannot be produced immediately, causing users to wait for a long time. On the other hand, the greater the difference between the initial temperature and the target temperature, the higher the energy efficiency of the heat pump unit. Conversely, the smaller the difference between the initial temperature and the target temperature, the lower the energy efficiency of the heat pump unit. If the heating start temperature of the insulated water tank is relatively high, the difference between the initial temperature and the target temperature will decrease, and the energy efficiency will decrease.

[0003] With regard to the problem that the method of circulating heating the insulated water tank by a heat pump unit in the prior art may cause users to wait for a long time or reduce energy efficiency, no effective solution has been proposed so far. Summary of the invention

[0004] The embodiments of the present invention provide a dual-tank water heater, a control method, a storage medium and an electronic device to solve the problem in the prior art that the method of circulating heating of the insulated water tank by a heat pump unit causes a long waiting time for users or reduces energy efficiency.

[0005] In order to solve the above technical problems, the present invention provides a double-tank water heater, which includes a heat pump unit, a heating water tank, an insulation water tank and a solar collector;

[0006] The heat pump unit has a water outlet end connected to the first water inlet of the heating water tank, and a water inlet connected to the first water outlet of the heating water tank;

[0007] The thermal insulation water tank has a first water inlet connected to the second water outlet of the heating water tank, a first water outlet connected to the user water outlet, and a second water outlet connected to the second water inlet of the heating water tank;

[0008] The water outlet end of the solar thermal collector is connected to the third water inlet of the heating water tank, and the water inlet end of the solar thermal collector is connected to the third water outlet of the heating water tank.

[0009] Furthermore, the double-tank water heater also includes:

[0010] A first water pump is arranged on a pipeline between the first water outlet of the heating water tank and the water inlet of the heat pump unit;

[0011] A second water pump is arranged on the pipeline between the second water outlet of the heating water tank and the first water inlet of the insulation water tank;

[0012] The third water pump is arranged on the pipeline between the third water outlet of the heating water tank and the water inlet of the solar collector.

[0013] Furthermore, the double-tank water heater also includes:

[0014] The control valve is arranged on the pipeline between the second water outlet of the thermal insulation water tank and the second water inlet of the heating water tank.

[0015] Furthermore, the double-tank water heater also includes:

[0016] A water return pipeline, whose water inlet is connected to the user water outlet, and whose water outlet is connected to the second water inlet of the thermal insulation water tank;

[0017] A water return valve, arranged on the water return pipeline;

[0018] The fourth water pump is arranged on the pipeline between the thermal insulation water tank and the user water outlet.

[0019] Furthermore, the double-tank water heater also includes:

[0020] A first liquid level detection device, disposed in the heating water tank, for detecting the liquid level in the heating water tank;

[0021] The second liquid level detection device is arranged in the thermal insulation water tank and is used to detect the liquid level in the thermal insulation water tank.

[0022] Furthermore, the double-tank water heater also includes:

[0023] A first temperature sensor is disposed in the heating water tank and is used to detect the temperature in the heating water tank;

[0024] A second temperature sensor is disposed in the thermal insulation water tank and is used to detect the temperature in the thermal insulation water tank;

[0025] A third temperature sensor is arranged at the water outlet of the solar thermal collector and is used to detect the outlet water temperature of the solar thermal collector;

[0026] A fourth temperature sensor is provided on the return water pipeline between the user water outlet and the second water inlet of the thermal insulation water tank, and is used to detect the return water temperature of the user water outlet;

[0027] The fifth temperature sensor is arranged in the outdoor environment and is used to detect the outdoor environment temperature.

[0028] The present invention also provides a control method, which is applied to the above-mentioned double-tank water heater, and the control method comprises:

[0029] Obtain the temperature in the insulation water tank and the temperature in the heating water tank;

[0030] The opening of the first heating cycle and the second heating cycle is controlled according to the temperature in the insulated water tank and the temperature in the heating water tank; wherein the first heating cycle is the water circulation between the heat pump unit and the heating water tank; the second heating cycle is the water circulation between the insulated water tank and the heating water tank.

[0031] Further, controlling the start of the first heating cycle and the second heating cycle according to the temperature in the heat preservation water tank and the temperature in the heating water tank includes:

[0032] If the temperature in the heat preservation water tank is less than the second set temperature minus the first preset margin, determining whether the temperature in the heating water tank is greater than the first set temperature minus the first preset margin;

[0033] If yes, the first heating cycle and the second heating cycle are controlled to be turned on at the same time until the temperature in the thermal insulation water tank is equal to the second set temperature, and then the first heating cycle and the second heating cycle are turned off, while the heating water tank is kept supplying water to the thermal insulation water tank until the thermal insulation water tank reaches the upper limit of the liquid level;

[0034] If not, first control the first heating cycle to be turned on, and then control the second heating cycle to be turned on after the temperature in the heating water tank is greater than the second set temperature minus the preset margin, until the temperature in the insulation water tank is equal to the second set temperature, turn off the first heating cycle and the second heating cycle, and keep the heating water tank supplying water to the insulation water tank until the insulation water tank reaches the upper limit of the liquid level;

[0035] Wherein, the first set temperature is greater than the second set temperature.

[0036] Furthermore, the control method further includes:

[0037] Determining the temperature interval in the heating water tank;

[0038] If the temperature in the heating water tank is less than the first set temperature minus the first preset margin, controlling the first heating cycle to start;

[0039] The first heating cycle is controlled to be closed until the temperature in the heating water tank is greater than the first set temperature plus the first preset margin.

[0040] Furthermore, the control method further includes:

[0041] Detecting the outlet water temperature of the solar thermal collector;

[0042] If the difference between the outlet water temperature of the solar thermal collector and the temperature in the heating water tank is greater than or equal to a first preset difference, and the outlet water temperature of the solar thermal collector is less than a third set temperature, the third heating cycle is controlled to start;

[0043] Until the difference between the outlet water temperature of the solar thermal collector and the temperature in the heating water tank is greater than a first preset difference and less than or equal to a second preset difference, the third heating cycle is controlled to be closed;

[0044] Wherein, the third heating cycle is a water cycle between the solar thermal collector and the heating water tank.

[0045] Further, after controlling the third heating cycle to start, the control method further includes:

[0046] Determine whether the temperature in the heating water tank is greater than the first set temperature plus the second preset margin, the liquid level in the heating water tank is less than the upper limit of the liquid level, and the liquid level in the insulation water tank is higher than the set liquid level;

[0047] If the conditions are met, the heating water tank is controlled to start replenishing water until the temperature in the heating water tank is lower than the first set temperature plus the third preset margin, or the liquid level in the heating water tank reaches the upper limit of the liquid level, and then the heating water tank is controlled to stop replenishing water;

[0048] Among them, the first preset margin is less than the third preset margin and less than the second preset margin.

[0049] Furthermore, the control method further includes:

[0050] Determine whether the liquid level of the thermal insulation water tank drops to the set liquid level, and the liquid level of the heating water tank drops to the lower limit of the liquid level;

[0051] If yes, the heating water tank is controlled to start replenishing water until the liquid level in the heating water tank rises to the upper limit of the liquid level, and then the heating water tank is controlled to stop replenishing water.

[0052] Furthermore, the control method further includes:

[0053] Determine whether the liquid level of the heating water tank is reduced to the lower limit of the liquid level;

[0054] If yes, the first heating cycle is controlled to be turned off.

[0055] Furthermore, the control method further includes:

[0056] Determine whether the temperature in the heating water tank is greater than or equal to the first set temperature plus the first preset margin, and less than or equal to the first set temperature plus the second preset margin, and whether the liquid level of the heating water tank reaches the upper limit of the liquid level;

[0057] If it is satisfied, the water in the heating water tank is controlled to flow out to the thermal insulation water tank until the liquid level in the heating water tank drops to the lower liquid level limit or the liquid level in the thermal insulation water tank reaches the upper liquid level limit.

[0058] Furthermore, the control method further includes:

[0059] Determine whether the current period is a concentrated water use period or a non-concentrated water use period; wherein the concentrated water use period and the non-concentrated water use period are determined based on the user's water use habits;

[0060] If it is during the concentrated water use period, the set liquid level of the thermal insulation water tank adopts the first set liquid level;

[0061] If it is during a non-centralized water use period, the set liquid level of the thermal insulation water tank adopts the second set liquid level;

[0062] Wherein, the second set liquid level is lower than the first set liquid level.

[0063] Furthermore, the control method further includes:

[0064] When the set liquid level of the insulated water tank adopts the first set liquid level, determine whether the liquid level of the insulated water tank is reduced to the set liquid level, and the liquid level of the heating water tank is reduced to the lower limit of the liquid level. If so, determine whether the temperature of the heating water tank reaches the first set temperature plus the second preset margin; if so, control the heating water tank to start replenishing water; if not, control the first heating cycle and the third heating cycle to start, until the temperature of the heating water tank reaches the first set temperature plus the second preset margin, and then control the heating water tank to start replenishing water.

[0065] When the set liquid level of the insulated water tank adopts the second set liquid level, determine whether the liquid level of the insulated water tank is reduced to the set liquid level, and the liquid level of the heating water tank is reduced to the lower limit of the liquid level. If so, control the heating water tank to replenish water. After the liquid level of the heating water tank reaches the upper limit of the liquid level, control the first heating cycle to start.

[0066] Furthermore, the control method further includes:

[0067] Detect the outdoor ambient temperature and the return water temperature at the user's water outlet;

[0068] If the outdoor ambient temperature is less than the preset threshold, and the return water temperature of the user water outlet is less than or equal to the fourth set temperature, the fourth heating cycle is controlled to start; wherein the fourth heating cycle is the water circulation between the user water outlet and the thermal insulation water tank;

[0069] Determine whether the return water temperature at the user's water outlet is greater than a fourth set temperature plus a fourth preset margin;

[0070] If yes, the fourth heating cycle is controlled to be turned off.

[0071] Furthermore, the control method further includes:

[0072] Obtaining the water supply pressure of the pipeline between the thermal insulation water tank and the user's water outlet;

[0073] If the water supply pressure is less than the first preset pressure, the frequency of the fourth water pump on the pipeline between the first water outlet of the thermal insulation water tank and the user water outlet is controlled to increase;

[0074] If the water supply pressure is less than or equal to the second preset pressure and greater than or equal to the first preset pressure, controlling the fourth water pump to maintain the current frequency;

[0075] If the water supply pressure is greater than the second preset pressure, the fourth water pump is controlled to reduce the frequency until the water supply pressure is less than or equal to the second preset pressure and greater than or equal to the first preset pressure, or after the fourth water pump is reduced to the lower frequency limit, the fourth water pump is controlled to maintain the current frequency;

[0076] After the fourth water pump is reduced to the lower frequency limit, it is determined whether the water supply pressure reaches the third preset pressure; if so, the fourth water pump is controlled to be turned off until the water supply pressure is less than the first preset pressure, the fourth water pump is controlled to be turned on and run at the lowest frequency, and then the frequency increase of the fourth water pump is triggered until the water supply pressure is greater than the second preset pressure, the fourth water pump is controlled to be reduced in frequency until the water supply pressure is less than or equal to the second preset pressure and greater than or equal to the first preset pressure, and the fourth water pump is controlled to keep the current frequency unchanged;

[0077] Among them, the third preset pressure>the second preset pressure>the first preset pressure.

[0078] The present invention also provides a computer-readable storage medium on which a computer program is stored, and the program implements the above control method when executed by a processor.

[0079] The present invention also provides an electronic device, comprising:

[0080] one or more processors;

[0081] The storage device is used to store one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement the above-mentioned control method.

[0082] By applying the technical solution of the present invention, water in the heating water tank is heated by circulating water between the heat pump unit and the heating water tank. When the temperature of the heating water tank reaches a certain temperature value, the hot water in the heating water tank is discharged into the insulated water tank. The water in the insulated water tank is not used for a long time and its temperature drops below a certain temperature value. The water circulation between the heating water tank and the heat pump unit is started, and at the same time or later, the water circulation between the heating water tank and the insulated water tank is started to heat the insulated water tank, so that the water in the insulated water tank is quickly heated up. Even if the trigger heating temperature of the insulated water tank is set relatively low, the heating can be completed quickly, the heating time is shortened, and the hot water output speed is guaranteed, thereby achieving a balance between water output speed and energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] Figure 1 is a structural diagram of a double-tank water heater according to an embodiment of the present invention;

[0084] Figure 2 is a flow chart of a control method according to an embodiment of the present invention;

[0085] Figure 3 is a flow chart of a heating control process according to an embodiment of the present invention;

[0086] Figure 4 is a flow chart of a water replenishment control process according to an embodiment of the present invention;

[0087] Figure 5 is a flow chart of a solar heating control process according to an embodiment of the present invention;

[0088] Figure 6 is a flow chart of a water return control process according to an embodiment of the present invention;

[0089] Figure 7 FIG. 4 is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0090] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all 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.

[0091] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0092] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0093] It should be understood that, although the terms first, second, third, etc. may be used to describe the water pumps in the embodiments of the present invention, the water pumps should not be limited to these terms. These terms are only used to distinguish the water pumps arranged at different positions. For example, without departing from the scope of the embodiments of the present invention, the first water pump may also be referred to as the second water pump, and similarly, the second water pump may also be referred to as the first water pump.

[0094] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0095] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0096] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0097] Example 1

[0098] In view of the problem that the method of circulating heating the insulated water tank by a heat pump unit in the prior art causes the user to wait for a long time or reduce the energy efficiency, this embodiment provides a double water tank water heater. Figure 1 is a structural diagram of a double-tank water heater according to an embodiment of the present invention, as shown in Figure 1As shown, the double water tank water heater comprises a heat pump unit 1, a heating water tank 2, an insulation water tank 3 and a solar collector 4; the heat pump unit 1, its water outlet end is connected to the first water inlet of the heating water tank 2, and its water inlet is connected to the first water outlet of the heating water tank 2; the insulation water tank 3, its first water inlet is connected to the second water outlet of the heating water tank 2, its first water outlet is connected to the user water outlet end 5, and its second water outlet is connected to the second water inlet of the heating water tank 2; the solar collector 4, its water outlet end is connected to the third water inlet of the heating water tank 2, and its water inlet is connected to the third water outlet of the heating water tank 2. The heating water tank 2 is also provided with a water replenishment port, which is connected to a water replenishment pipeline, and a water replenishment valve F1 is provided on the water replenishment pipeline.

[0099] The heating water tank 2 is heated by the heat pump unit 1. When the temperature of the heating water tank 2 reaches a certain temperature value, the hot water in the heating water tank 2 is discharged to the insulated water tank 3. If the water in the insulated water tank 3 is not used for a long time and the temperature drops below a certain temperature value, the water circulation between the heating water tank 2 and the heat pump unit 1 is started, and the water circulation between the heating water tank 2 and the insulated water tank 3 is started at the same time or later. The water in the insulated water tank is heated by the heat pump unit 1, and the water in the heating water tank 2 is used to heat the water in the insulated water tank 3. This cycle is repeated until the water in the insulated water tank 3 reaches the set temperature value, and then the water circulation between the heating water tank 2 and the heat pump unit 1 and the water circulation between the heating water tank 2 and the insulated water tank 3 are stopped.

[0100] The double water tank water heater of the present embodiment heats the water in the heating water tank 2 by circulating water between the heat pump unit 1 and the heating water tank 2. When the temperature of the heating water tank 2 reaches a certain temperature value, the hot water in the heating water tank 2 is discharged into the insulated water tank 3. The water in the insulated water tank 3 has not been used for a long time and its temperature has dropped below a certain temperature value. The water circulation between the heating water tank 2 and the heat pump unit 1 is started, and the water circulation between the heating water tank 2 and the insulated water tank 3 is started at the same time or later to heat the insulated water tank, so that the water in the insulated water tank 3 is quickly heated up. Even if the trigger heating temperature of the insulated water tank 3 is set relatively low, the heating can be completed quickly, the heating time is shortened, and the hot water output speed is guaranteed, thereby achieving a balance between water output speed and energy efficiency.

[0101] In order to provide power for the water circulation between the heat pump unit 1 and the heating water tank 2 and ensure the circulation effect, the above-mentioned double-tank water heater also includes: a first water pump B1, which is arranged on the pipeline between the first water outlet of the heating water tank 2 and the water inlet of the heat pump unit 1.

[0102] In order to circulate water between the insulated water tank 3 and the heating water tank 2, or to ensure that the heating water tank provides power to supply water to the insulated water tank, the above-mentioned double water tank water heater also includes: a second water pump B2, which is arranged on the pipeline between the second water outlet of the heating water tank 2 and the first water inlet of the insulated water tank 3.

[0103] In order to provide power for the water circulation between the heating water tank 2 and the solar collector 4 , the double-tank water heater further comprises: a third water pump B3 , which is arranged on the pipeline between the third water outlet of the heating water tank 2 and the water inlet of the solar collector 4 .

[0104] In order to realize one-way water supply from the heating water tank 2 to the insulated water tank 3, or two-way circulation between the heating water tank 2 and the insulated water tank 3, and switching between the two, the above-mentioned double-tank water heater also includes: a control valve F2, which is arranged on the pipeline between the second water outlet of the insulated water tank 3 and the second water inlet of the heating water tank 2.

[0105] Since the pipeline between the insulated water tank 3 and the user water outlet 5 is arranged outside the heating system, if it is not used for a long time, it will exchange heat with the outside and cause the temperature to drop, so that hot water cannot be immediately supplied. In order to avoid the water in the water supply pipeline from cooling down and causing the water to be unable to be immediately supplied, the above-mentioned double-tank water heater also includes:

[0106] The water return pipeline has a water inlet connected to the user water outlet 5 and a water outlet connected to the second water inlet of the thermal insulation water tank 3; a water return valve F3 is arranged on the water return pipeline.

[0107] In order to provide power for water circulation between the insulated water tank 3 and the user water outlet 5 , the above-mentioned double-tank water heater also includes: a fourth water pump B4 , which is arranged on the pipeline between the first water outlet of the insulated water tank 3 and the user water outlet 5 .

[0108] In order to detect the liquid level in the heating water tank 2 so as to facilitate water replenishment control, the double-tank water heater further comprises: a first liquid level detection device 21 , which is arranged in the heating water tank 2 .

[0109] In order to detect the liquid level in the insulated water tank 3 so as to facilitate water replenishment control, the double-tank water heater further comprises: a second liquid level detection device 31 , which is arranged in the insulated water tank 3 .

[0110] In order to detect the temperature T1 of the heating water tank so as to facilitate water replenishment control and heating control, the above-mentioned double-tank water heater also includes: a first temperature sensor, which is arranged in the heating water tank 2.

[0111] In order to detect the temperature T2 of the insulated water tank so as to facilitate water inlet control and heating control, the above-mentioned double-tank water heater also includes: a second temperature sensor, which is arranged in the insulated water tank 3.

[0112] In order to detect the outlet water temperature T3 of the solar thermal collector 4 so as to start and stop the solar heater, the double-tank water heater further comprises: a third temperature sensor disposed at the outlet water end of the solar thermal collector 4 .

[0113] In order to detect the return water temperature T4 of the user's water outlet 5 for the convenience of return water control, the above-mentioned dual-tank water heater also includes: a fourth temperature sensor, which is arranged on the return water pipeline between the user's water outlet 5 and the second water inlet of the insulated water tank 3, and is used to detect the return water temperature of the user's water outlet 5.

[0114] In order to detect the outdoor environment temperature, the above-mentioned dual-tank water heater also includes: a fifth temperature sensor, which is arranged in the outdoor environment.

[0115] In conventional heat pump circulation hot water systems, the heat pump unit must always maintain the water tank temperature at the user's required temperature. The heat pump unit always operates in a section with a higher condensing temperature, resulting in higher energy consumption and lower energy efficiency.

[0116] In this embodiment, if the temperature T1 of the heating water tank is greater than T1 set -5, the second water pump B2 and the control valve F2 are turned on, the heat pump unit heats the heating water tank, and the circulation between the heating water tank and the insulation water tank is turned on, and the water in the insulation water tank is heated by the heating water tank to ensure that the water in the insulation water tank reaches the set temperature. If the temperature T1 of the heating water tank is less than or equal to T1 set -5, the unit first heats the heating water tank to T1 set -5, and then circulates the two water tanks, which can achieve both the water outlet speed and the energy efficiency of the heat pump unit.

[0117] At present, water heaters with solar collectors always operate at a higher temperature range. When the solar temperature is low or the solar energy is not used at night, the solar energy cannot be fully utilized. This embodiment uses the liquid level and time control of the thermal insulation water tank to implement a control strategy of preferentially utilizing solar energy. Through the dual water tank setting, low-grade solar energy can be fully utilized and the energy efficiency of the unit operation can be improved.

[0118] The insulated water tank is set with a timing and water level setting function. For example, when water usage is low during the day, a smaller liquid level is set. When it is detected that the liquid level in the insulated water tank is lower than the set level, the hot water in the heating water tank is input into the insulated water tank. When the liquid level in the heating water tank reaches the minimum level, the heating water tank is triggered to replenish water. Since a large amount of cold water is replenished, the water temperature is lower than the solar water temperature, so low-grade solar energy can be utilized.

[0119] Example 2

[0120] This embodiment provides a control method, which is applied to the double-tank water heater in the above embodiment. Figure 2 is a flow chart of a control method according to an embodiment of the present invention, as shown in Figure 2 As shown, the above control method includes:

[0121] S101, obtaining the temperature in the insulation water tank and the temperature in the heating water tank.

[0122] S102, control the start of the first heating cycle and the second heating cycle according to the temperature in the insulated water tank and the temperature in the heating water tank; the first heating cycle is the water cycle between the heat pump unit and the heating water tank; the second heating cycle is the water cycle between the insulated water tank and the heating water tank.

[0123] The control scheme of this embodiment heats the water in the heating water tank 2 by circulating water between the heat pump unit 1 and the heating water tank 2. When the temperature of the heating water tank 2 reaches a certain temperature value, the hot water in the heating water tank 2 is discharged to the insulated water tank 3. The water in the insulated water tank 3 has not been used for a long time and its temperature has dropped below a certain temperature value. The water circulation between the heating water tank 2 and the heat pump unit 1 is started, and the water circulation between the heating water tank 2 and the insulated water tank 3 is started at the same time or later to heat the insulated water tank, so that the water in the insulated water tank 3 is quickly heated up. Even if the trigger heating temperature of the insulated water tank 3 is set relatively low, the heating can be completed quickly, the heating time is shortened, and the hot water output speed is guaranteed, thereby achieving a balance between water output speed and energy efficiency.

[0124] In order to stabilize the temperature of the heating water tank and the insulation water tank, the first set temperature and the second set temperature are set respectively. At the same time, in order to avoid frequent temperature adjustment, a certain margin will be set. The first set temperature minus the first preset margin is the lower limit temperature for triggering the heat pump unit to heat the heating water tank; the first set temperature plus the first preset margin is the upper limit temperature for triggering the heat pump unit to stop heating the heating water tank. The second set temperature minus the first preset margin is the lower limit temperature of the insulation water tank, and the second set temperature plus the first preset margin is the upper limit temperature of the insulation water tank. When the temperature in the insulated water tank is less than the second set temperature minus the first preset margin, it indicates that the water temperature in the insulated water tank is already lower than the lower temperature limit and cannot meet the user's needs. At this time, if the temperature in the heating water tank is greater than the first set temperature minus the first preset margin, it indicates that the temperature in the heating water tank is higher. If the water in the heating water tank is mixed with the water in the insulated water tank at this time, the water temperature in the insulated water tank will rise to above its lower temperature limit. At this time, directly starting the water circulation between the insulated water tank and the heating water tank can also directly produce hot water that meets the user's needs and ensure instant hot water. However, if the temperature in the heating water tank is less than the first set temperature minus the first preset margin, considering the heat loss during the transmission process, if the water in the heating water tank is mixed with the water in the insulated water tank at this time, the water temperature in the insulated water tank will not rise to above its lower temperature limit. Directly starting the water circulation between the insulated water tank and the heating water tank at this time will result in failure to produce instant hot water. Therefore, it is necessary to heat the heating water tank first so that its temperature reaches the first set temperature minus the first preset margin before the heating water tank and the insulated water tank can be turned on. Water circulation between the warm water tanks, therefore, the opening of the first heating cycle and the second heating cycle is controlled according to the temperature in the insulated water tank and the temperature in the heating water tank, including: if the temperature in the insulated water tank is less than the second set temperature minus the first preset margin, then determine whether the temperature in the heating water tank is greater than the first set temperature minus the first preset margin; if so, control the first heating cycle and the second heating cycle to be turned on at the same time, until the temperature in the insulated water tank is equal to the second set temperature, then turn off the first heating cycle and the second heating cycle, and keep the heating water tank supplying water to the insulated water tank until the insulated water tank reaches the upper limit of the liquid level; if not, first control the first heating cycle to be turned on, and then after the temperature in the heating water tank is greater than the second set temperature minus the preset margin, control the second heating cycle to be turned on, until the temperature in the insulated water tank is equal to the second set temperature, then turn off the first heating cycle and the second heating cycle, and keep the heating water tank supplying water to the insulated water tank until the insulated water tank reaches the upper limit of the liquid level; wherein, considering the heat loss during hot water transportation, the first set temperature is greater than the second set temperature.

[0125] The first heating cycle is controlled to be turned on, and the specific steps include: controlling the heat pump unit to run, and controlling the first water pump B1 on the pipeline between the first water outlet of the heating water tank and the water inlet of the heat pump unit 1 to be turned on. The second heating cycle is controlled to be turned on, and the specific steps include: controlling the second water pump B2 on the pipeline between the second water outlet of the heating water tank 2 and the first water inlet of the insulation water tank 3 to be turned on, and controlling the control valve F2 on the pipeline between the second water outlet of the insulation water tank 3 and the second water inlet of the heating water tank 2 to be opened.

[0126] In order to ensure that the temperature of the heating water tank is stable within a certain range and avoid frequent heating, the above control method also includes: judging the temperature range in the heating water tank; if the temperature in the heating water tank is less than the first set temperature minus the first preset margin, controlling the first heating cycle to turn on; until the temperature in the heating water tank is greater than the first set temperature plus the first preset margin, controlling the first heating cycle to turn off. In actual applications, the above process is repeated continuously to stabilize the temperature of the heating water tank between the first set temperature minus the first preset margin and the first set temperature plus the first preset margin.

[0127] In order to make full use of the heat of the solar thermal collector, the above-mentioned control method also includes: detecting the outlet water temperature of the solar thermal collector; if the difference between the outlet water temperature of the solar thermal collector and the temperature in the heating water tank is greater than or equal to the first preset difference, and the outlet water temperature of the solar thermal collector is less than the third set temperature, indicating that the solar thermal collector can be used to heat the heating water tank, then the water circulation between the solar thermal collector and the heating water tank is controlled, that is, the third heating cycle is turned on; until the difference between the outlet water temperature of the solar thermal collector and the temperature in the heating water tank is greater than the first preset difference and less than or equal to the second preset difference, indicating that the temperature difference between the outlet water temperature of the solar thermal collector and the temperature in the heating water tank is too small, and the heating water tank cannot be effectively heated, at this time the third heating cycle is controlled to be closed. When the outlet water temperature of the solar thermal collector is lower than the third set temperature, it indicates that the outlet water temperature of the solar thermal collector is relatively high. If the water circulation between the solar thermal collector and the heating water tank is turned on, the heating water tank will be much higher than its upper temperature limit. If the liquid level is high, there is no way to digest this part of hot water. Therefore, when the outlet water temperature of the solar thermal collector is lower than the third set temperature, the third heating cycle is controlled to be closed, and the solar thermal energy can be stored through the heat storage device or converted into other forms of energy.

[0128] In order to fully recycle and utilize solar energy, after the third heating cycle is controlled to be turned on, the above control method also includes: judging whether the temperature in the heating water tank is greater than the first set temperature plus the second preset margin, and the liquid level in the heating water tank is less than the upper limit of the liquid level, and the liquid level in the insulation water tank is higher than the set liquid level; if satisfied, the heating water tank is controlled to start replenishing water until the temperature in the heating water tank is less than the first set temperature plus the third preset margin, or the liquid level in the heating water tank reaches the upper limit of the liquid level, and the heating water tank is controlled to stop replenishing water; wherein, the first preset margin < the third preset margin < the second preset margin, that is, after the temperature in the heating water tank is heated to the first set temperature plus the second preset margin by the solar collector, water replenishment is carried out when the liquid level meets the water adding conditions, and the replenished water temperature is relatively low, and solar energy can be used to heat this part of low-temperature water to achieve full recycling of solar energy. At the same time, liquid level and temperature constraints are set to avoid the temperature of the heating water tank being too low or the liquid level being too high.

[0129] After the liquid level in the insulated water tank drops to the set liquid level, if the liquid level in the heating water tank is above its lower liquid level limit, water can be supplied to the insulated water tank through the heating water tank. Therefore, there is no need to replenish water temporarily. However, if the liquid level in the heating water tank also reaches its lower liquid level limit, it is necessary to replenish water in the heating water tank, and heat the replenished water to a certain temperature before supplying it to the insulated water tank. Therefore, the above control method also includes: judging whether the liquid level in the insulated water tank is lowered to the set liquid level and the liquid level in the heating water tank is lowered to the lower liquid level limit; if so, controlling the heating water tank to start replenishing water until the liquid level in the heating water tank rises to the upper liquid level limit, and then controlling the heating water tank to stop replenishing water.

[0130] After the liquid level in the heating water tank drops to the lower limit, if heating is continued, the heating water tank will dry out. In order to prevent the heating water tank from drying out, the above control method also includes: judging whether the liquid level in the heating water tank drops to the lower limit; if so, controlling the first heating cycle to be closed.

[0131] As mentioned above, the heating water tank is used to heat the insulated water tank, therefore, its set temperature should be higher than the set temperature of the insulated water tank. In addition, water will lose heat when it is transferred from the heating water tank to the insulated water tank. Therefore, the temperature of the heating water tank should be set with a higher margin to ensure that the water temperature in the insulated water tank is within the set range. At the same time, in order to avoid frequent water supply from the heating water tank, it is necessary to wait until the liquid level in the heating water tank reaches the upper limit of the liquid level before it is delivered to the insulated water tank. Therefore, the above control method also includes: judging whether the temperature in the heating water tank is greater than or equal to the first set temperature plus the first preset margin, and less than or equal to the first set temperature plus the second preset margin, and the liquid level in the heating water tank reaches the upper limit of the liquid level; if so, controlling the water in the heating water tank to flow out to the insulated water tank until the liquid level in the heating water tank drops to the lower limit of the liquid level or the liquid level in the insulated water tank reaches the upper limit of the liquid level; if the above conditions are not met, the heating water tank does not supply water to the insulated water tank.

[0132] According to the life pattern of modern people, hot water is not always used in a day. During a certain period of time, water will be used in a concentrated manner with a large amount of water. During the remaining time, water will not be used in a concentrated manner with a small amount of water. During the concentrated water use period, more water needs to be stored in the insulated water tank for user use. Therefore, the above control method also includes: judging whether it is currently in a concentrated water use period or a non-concentrated water use period; wherein the concentrated water use period and the non-concentrated water use period are determined based on the user's water use habits; if it is in a concentrated water use period, the set liquid level of the insulated water tank adopts the first set liquid level; if it is in a non-concentrated water use period, the set liquid level of the insulated water tank adopts the second set liquid level; wherein the second set liquid level is lower than the first set liquid level.

[0133] When the set liquid level of the thermal insulation water tank adopts the first set liquid level, it indicates that the water consumption is relatively high and the user may use water at any time. At this time, the user's water demand is given priority; when the set liquid level of the thermal insulation water tank adopts the second set liquid level, it indicates that the water consumption is relatively low and the user is less likely to use water in a short period of time. At this time, energy efficiency is given priority. In view of the above reasons, the above control method also includes:

[0134] When the set liquid level of the insulated water tank adopts the first set liquid level, determine whether the liquid level of the insulated water tank is lowered to the first set liquid level, and the liquid level of the heating water tank is lowered to the lower limit of the liquid level. If so, determine whether the temperature of the heating water tank reaches the first set temperature plus the second preset margin; if so, control the heating water tank to start replenishing water; if not, control the first heating cycle and the third heating cycle to start, until the temperature of the heating water tank reaches the first set temperature plus the second preset margin, control the heating water tank to start replenishing water, because heating a small amount of water is faster than heating a large amount of water, replenishing water when the temperature is higher can meet the needs of rapid hot water output.

[0135] When the set liquid level of the insulated water tank adopts the second set liquid level, it is determined whether the liquid level of the insulated water tank is reduced to the second set liquid level, and the liquid level of the heating water tank is reduced to the lower limit of the liquid level. If so, the heating water tank is controlled to replenish water. After the liquid level of the heating water tank reaches the upper limit of the liquid level, the first heating cycle is controlled to start. That is, when the user's water demand is low, water replenishment is started after the liquid level of the heating water tank is reduced to the lower limit of the liquid level. Regardless of the temperature, the replenished cold water is heated to the expected temperature. Although it takes a long time, it has the highest energy efficiency.

[0136] Since the pipeline between the insulated water tank and the user's water outlet is arranged outside the heating system, if it is not used for a long time, it will exchange heat with the outside world and cause the temperature to drop, so that hot water cannot be supplied immediately. In order to avoid the water in the water supply pipeline from cooling down, resulting in the inability to supply hot water immediately, the above-mentioned control method also includes: detecting the outdoor ambient temperature and the return water temperature of the user's water outlet; if the outdoor ambient temperature is less than a preset threshold and the return water temperature of the user's water outlet is less than or equal to a fourth set temperature, the fourth heating cycle is controlled to be turned on; wherein the fourth heating cycle is the water circulation between the user's water outlet and the insulated water tank; judging whether the return water temperature of the user's water outlet is greater than the fourth set temperature plus a fourth preset margin; if so, the fourth heating cycle is controlled to be turned off.

[0137] In order to ensure that the pressure of water used by end users is always constant and there will be no sudden changes in temperature, the above-mentioned control method also includes: obtaining the water supply pressure of the pipeline between the insulated water tank and the user's water outlet; if the water supply pressure is less than the first preset pressure, controlling the frequency of the fourth water pump on the pipeline between the first water outlet of the insulated water tank and the user's water outlet to increase; if the water supply pressure is less than or equal to the second preset pressure and greater than or equal to the first preset pressure, controlling the fourth water pump to maintain the current frequency; if the water supply pressure is greater than the second preset pressure, controlling the fourth water pump to reduce the frequency until the water supply pressure is less than or equal to the second preset pressure and When the pressure is greater than or equal to the first preset pressure, or after the fourth water pump is reduced to the lower limit of the frequency, the fourth water pump is controlled to maintain the current frequency; after the fourth water pump is reduced to the lower limit of the frequency, it is determined whether the water supply pressure reaches the third preset pressure; if so, the fourth water pump is controlled to be turned off until the water supply pressure is less than the first preset pressure, the fourth water pump is controlled to be turned on and run at the lowest frequency, and then the frequency increase of the fourth water pump is triggered until the water supply pressure is greater than the second preset pressure, the fourth water pump is controlled to reduce the frequency until the water supply pressure is less than or equal to the second preset pressure and greater than or equal to the first preset pressure, and the fourth water pump is controlled to maintain the current frequency unchanged;

[0138] Among them, the third preset pressure>the second preset pressure>the first preset pressure.

[0139] Example 3

[0140] This embodiment provides another control method, which is applied to the above-mentioned double-tank water heater. Figure 3 : is a flow chart of a heating control process according to an embodiment of the present invention. Figure 3 As shown, the heating control process includes:

[0141] S31, detecting the temperature T1 in the heating water tank and the temperature T2 in the insulation water tank.

[0142] S32, determine whether T2<T2set-5 is satisfied; if yes, execute step S33; if no, return to step S31.

[0143] S33, determine whether T1>T1 set-5 is satisfied; if not, execute step S34; if not, execute step S37.

[0144] S34, the first water pump B1 is turned on.

[0145] S35, determine whether T1>T1set-5 is satisfied; if yes, execute step S6; if no, repeat step S5.

[0146] S36, control valve F2 and second water pump B2 are turned on.

[0147] S37, the first water pump B1, the control valve F2, and the second water pump B2 are turned on.

[0148] S38, determine whether T2=T2 is satisfied; if yes, execute step S9; if no, repeat step S38.

[0149] S9, control the first water pump B1 and control valve F2 to close, control the second water pump B2 to remain open, and turn off the second water pump B2 after the liquid level H2 of the insulation water tank reaches H2max.

[0150] Figure 4 Flow chart of the water replenishment control process according to an embodiment of the present invention. Figure 4 As shown, the water replenishment control process includes:

[0151] S41, detecting the liquid level H2 of the insulation water tank, the liquid level H1 of the heating water tank, and the temperature T1 in the heating water tank.

[0152] S42, determine whether H2≤H2set and H2≤H1min are satisfied; if yes, execute step S43; if no, execute step S46.

[0153] S43, control the water supply valve F1 to open.

[0154] S44, determine whether H1=H1max is satisfied; if yes, execute step S45; if no, return to step S43.

[0155] S45, controlling the water supply valve F1 to close.

[0156] S46, determine whether H2>H2set, H1<H1max, and T1≥T1set+10 are satisfied; if yes, execute step S47; if not, return to step S41.

[0157] S47, control the water supply valve F1 to open.

[0158] S48, determine whether T1 is less than or equal to T1set+7, or H1=H1max; if yes, execute step S49; if no, return to step S47.

[0159] Figure 5 FIG. 4 is a flow chart of a solar heating control process according to an embodiment of the present invention. Figure 5 As shown, the solar heating control process includes:

[0160] S51, detecting the outlet water temperature T3 of the solar water collector.

[0161] S52, determine whether T3-T1≥6°C and T3<T3 is satisfied; if yes, execute step S53; if no, repeat step S52.

[0162] S53, controlling the third water pump B3 to start.

[0163] S54, determine whether T3-T1≤2°C is satisfied; if yes, execute step S55; if no, repeat step S53.

[0164] S55, controlling the third water pump B3 to be turned off.

[0165] Figure 6 Flow chart of the water return control process according to an embodiment of the present invention. Figure 5 As shown in FIG. 1 , the return water control process includes:

[0166] S61, detecting the return water temperature T4 at the user's water outlet.

[0167] S62, determine whether T4<T4 is satisfied; if yes, execute step S63; if no, return to step S61.

[0168] S63, controlling the fourth water pump B4 to start.

[0169] S64, determine whether T4>T4 set +5°C is satisfied; if yes, execute step S65; if no, repeat step S64.

[0170] S65, controlling the fourth water pump B4 to be turned off.

[0171] In summary, the control process of this embodiment is as follows:

[0172] (1) Automatic water replenishment: When the liquid level of the insulation water tank is H2≤H2 setting, and the liquid level of the heating water tank is H1≤H1min, open the water replenishment valve F1, replenish a large amount of cold water to H1max at one time, and stop replenishing water (heating water replenishment of the heat pump unit). When H2>H2 setting and H1<H1max, and T1>T1 setting+10, open the water replenishment solenoid valve until T1 setting+6<T1≤T1 setting+7, and close the water replenishment solenoid valve. (Solar high temperature water replenishment)

[0173] (2) Solar energy cycle: When T4-T1≥6℃ and T4<65℃, turn on water pump B3; when T4-T1≤2℃, turn off water pump B3.

[0174] (3) Unit circulation: When the temperature T1<T1 set -5℃, start the heat pump unit and circulation pump B1; when T1≥T1 set +5, shut down the unit and circulation pump B1. Anti-dry burning: When the water level H1<H1min, the unit and circulation pump will not start.

[0175] (4) Pumping water from the heating water tank to the insulation water tank: When the temperature of the heating water tank T1 ≥ T1 set + 5 and H1 is greater than or equal to H1max, turn on the water pump B2 to pump water to the insulation water tank until the liquid level in the insulation water tank reaches H2max or the liquid level in the heating water tank reaches H1min.

[0176] (5) Insulation of the water tank: When the temperature of the water tank is detected to be T2<T2 set-5, and the temperature of the heating water tank is T1>T1 set-5, the water pump B2 and the solenoid valve F-2 are turned on to exchange hot water between the two water tanks. At this time, the heating condition of the heating water tank is triggered, and the heat pump unit is turned on. After the water temperature of the water tank is raised to the set temperature T2 set, the water pump 1 and the control valve F2 are turned off, and the water pump B2 is controlled to continue to run until the liquid level of the heating water tank reaches the minimum level or the liquid level of the water tank reaches the maximum level, and the water pump B2 stops running. When the temperature of the water tank is detected to be T2<T2 set-5, and the temperature of the heating water tank is T1<T1 set-5, the unit first heats the heating water tank to T1>T1 set-5, and then turns on the water pump B2 and the solenoid valve F-2 for circulation.

[0177] (6) Liquid level control of the insulation water tank: Set the liquid level control according to the user's water usage habits. Set the low liquid level 1-2 level during the period of low water consumption from 24:00 to 13:00. When the liquid level is between 1-2 levels, the heating water tank uses a solenoid valve to add water to the highest level before heating. When the liquid level is higher than the 2nd level, the heating water tank temperature needs to be higher than T1 setting + 10 before adding water. Similarly, set the 3-4 level from 13:00 to 23:00 in the afternoon.

[0178] (7) Outlet water circulation insulation: During the set period, when T4 ≤ T4 setting ℃, the return valve is opened to detect whether the water supply circulation pump B4 is turned on. If it is turned on, it continues to operate according to step 6. If it is turned off, the water pump is turned on and runs at the lowest frequency. When T3>T3 setting, F3 is turned off, and the water supply circulation pump operates according to step 6. When the outdoor ambient temperature is less than ≤4℃ and the return water temperature T4 ≤10℃, the water pump B4 is turned on for circulation. When T4 ≥15℃, the circulation is turned off.

[0179] (8) Constant pressure water supply: Maintain the pipe network pressure Pset. Detect the pipe network pressure. When the pressure P<Pset-50KPa, increase the frequency. When P>Pset+50KPa, reduce the frequency. When the frequency is reduced to 35HZ (minimum frequency) and P>Pset+150KPa, turn off the water pump B4. When P<Pset-50KPa, turn on the water pump B4. The water pump start frequency is 35HZ.

[0180] Example 4

[0181] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the control method of the above embodiment is implemented.

[0182] Example 5

[0183] This embodiment provides an electronic device, including:

[0184] one or more processors;

[0185] The storage device is used to store one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement the control method of the above embodiment.

[0186] Figure 7 FIG. 1 is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. Figure 7 As shown, the electronic device includes:

[0187] One or more processors 710 and memory 720, Figure 7 A processor 710 is taken as an example.

[0188] The electronic device may further include: an input device 730 and an output device 740 .

[0189] The processor 710, the memory 720, the input device 730 and the output device 740 may be connected via a bus or other means. Figure 7 The example of connecting through bus is taken in the following.

[0190] The memory 720 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules corresponding to the control method in the embodiment of the present invention. The processor 710 executes various functional applications and data processing of the server by running the non-volatile software programs, instructions and modules stored in the memory 720, that is, implementing the above control method embodiment.

[0191] The memory 720 may include a program storage area and a data storage area, wherein the program storage area may store an application required for operating the device and at least one function; the data storage area may store data created according to the use of the device for editing the content in the document, etc. In addition, the memory 720 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0192] The input device 730 may receive input digital or character information and generate key signal input related to user settings and function control of the electronic device. The output device 740 may include a display device such as a display screen.

[0193] The one or more modules are stored in the memory 720, and when executed by the one or more processors 710, perform the control method in any of the above method embodiments.

[0194] The electronic device can execute the method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not described in detail in this embodiment, please refer to the method provided by the embodiment of the present invention.

[0195] The electronic devices of the embodiments of the present invention exist in various forms, including but not limited to:

[0196] (1) Mobile communication devices: These devices are characterized by their mobile communication functions and their main purpose is to provide voice and data communications. These terminals include: smart phones (such as iPhone), multimedia phones, functional phones, and low-end phones.

[0197] (2) Ultra-mobile personal computer devices: These devices fall into the category of personal computers, have computing and processing capabilities, and generally also have mobile Internet access features. These terminals include: PDA, MID and UMPC devices, such as iPad.

[0198] (3) Portable entertainment devices: These devices can display and play multimedia content. They include audio and video players (such as iPods), handheld game consoles, e-books, as well as smart toys and portable car navigation devices.

[0199] (4) Server: A device that provides computing services. The server consists of a processor, hard disk, memory, device bus, etc. The server is similar to the general computer architecture, but because it needs to provide highly reliable services, it has higher requirements in terms of processing power, stability, reliability, security, scalability, manageability, etc.

[0200] (5) Other electronic devices with data interaction functions, such as televisions, large-screen cars, etc.

[0201] 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 described in each embodiment or some parts of the embodiments.

[0202] 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 double-tank water heater, characterized in that: The double-tank water heater includes a heat pump unit, a heating water tank, an insulation water tank and a solar collector; The heat pump unit has its water outlet connected to the first water inlet of the heating water tank, and its water inlet connected to the first water outlet of the heating water tank; The thermal insulation water tank has a first water inlet connected to the second water outlet of the heating water tank, a first water outlet connected to the user water outlet, and a second water outlet connected to the second water inlet of the heating water tank; The water outlet end of the solar thermal collector is connected to the third water inlet of the heating water tank, and the water inlet end of the solar thermal collector is connected to the third water outlet of the heating water tank.

2. The double-tank water heater according to claim 1, characterized in that: The dual-tank water heater also includes: a first water pump, arranged on a pipeline between the first water outlet of the heating water tank and the water inlet of the heat pump unit; a second water pump, provided on a pipeline between the second water outlet of the heating water tank and the first water inlet of the insulation water tank; The third water pump is arranged on the pipeline between the third water outlet of the heating water tank and the water inlet of the solar collector.

3. The double-tank water heater according to claim 1, characterized in that: The dual-tank water heater also includes: The control valve is arranged on the pipeline between the second water outlet of the thermal insulation water tank and the second water inlet of the heating water tank.

4. The double-tank water heater according to claim 1, characterized in that: The dual-tank water heater also includes: A return water pipeline, the water inlet of which is connected to the user water outlet, and the water outlet of which is connected to the second water inlet of the thermal insulation water tank; A return valve is provided on the return pipe; The fourth water pump is arranged on the pipeline between the thermal insulation water tank and the user water outlet.

5. The double-tank water heater according to claim 1, characterized in that: The dual-tank water heater also includes: a first liquid level detection device, disposed in the heating water tank, for detecting the liquid level in the heating water tank; The second liquid level detection device is arranged in the thermal insulation water tank and is used to detect the liquid level in the thermal insulation water tank.

6. The double-tank water heater according to claim 1, characterized in that: The dual-tank water heater also includes: a first temperature sensor, disposed in the heating water tank, for detecting the temperature in the heating water tank; A second temperature sensor is provided in the thermal insulation water tank and is used to detect the temperature in the thermal insulation water tank; a third temperature sensor, disposed at a water outlet of the solar thermal collector, for detecting the outlet water temperature of the solar thermal collector; A fourth temperature sensor is provided on the return water pipe between the user water outlet and the second water inlet of the thermal insulation water tank, and is used to detect the outdoor ambient temperature and the return water temperature of the user water outlet; The fifth temperature sensor is arranged in the outdoor environment and is used to detect the outdoor environment temperature.

7. A control method, applied to the dual-tank water heater according to any one of claims 1 to 6, characterized in that: The control method includes: Get the temperature in the insulation water tank and the temperature in the heating water tank; The opening of the first heating cycle and the second heating cycle is controlled according to the temperature in the thermal insulation water tank and the temperature in the heating water tank; wherein, the first heating cycle is the water circulation between the heat pump unit and the heating water tank; the second heating cycle is the water circulation between the thermal insulation water tank and the heating water tank.

8. The control method according to claim 7, characterized in that: Controlling the start of the first heating cycle and the second heating cycle according to the temperature in the heat preservation water tank and the temperature in the heating water tank includes: If the temperature in the heat preservation water tank is lower than the second set temperature minus the first preset margin, determining whether the temperature in the heating water tank is higher than the first set temperature minus the first preset margin; If yes, the first heating cycle and the second heating cycle are controlled to be turned on simultaneously until the temperature in the thermal insulation water tank reaches the second set temperature, and then the first heating cycle and the second heating cycle are turned off, while the heating water tank is kept supplying water to the thermal insulation water tank until the thermal insulation water tank reaches the upper limit of the liquid level; If not, first control the first heating cycle to be turned on, and then control the second heating cycle to be turned on after the temperature in the heating water tank is greater than the second set temperature minus a preset margin. After the temperature in the insulation water tank is equal to the second set temperature, the first heating cycle and the second heating cycle are turned off, while keeping the heating water tank supplying water to the insulation water tank until the insulation water tank reaches the upper limit of the liquid level. Wherein, the first set temperature is greater than the second set temperature.

9. The control method according to claim 7, characterized in that: The control method further includes: Determining the temperature range in the heating water tank; If the temperature in the heating water tank is lower than the first set temperature minus a first preset margin, controlling the first heating cycle to start; Until the temperature in the heating water tank is greater than the first set temperature plus a first preset margin, the first heating cycle is controlled to be closed.

10. The control method according to claim 9, characterized in that: The control method further includes: detecting the outlet water temperature of the solar thermal collector; If the difference between the outlet water temperature of the solar thermal collector and the temperature in the heating water tank is greater than or equal to a first preset difference, and the outlet water temperature of the solar thermal collector is lower than a third set temperature, then controlling the third heating cycle to start; until the difference between the outlet water temperature of the solar thermal collector and the temperature in the heating water tank is greater than a first preset difference and less than or equal to a second preset difference, controlling the third heating cycle to be closed; Wherein, the third heating cycle is a water circulation between the solar thermal collector and the heating water tank.

11. The control method according to claim 10, characterized in that: After controlling the third heating cycle to start, the control method further includes: Determining whether the temperature in the heating water tank is greater than a first set temperature plus a second preset margin, the liquid level in the heating water tank is less than an upper liquid level limit, and the liquid level in the insulation water tank is higher than a set liquid level; If the conditions are met, the heating water tank is controlled to start replenishing water until the temperature in the heating water tank is lower than the first set temperature plus a third preset margin, or the liquid level in the heating water tank reaches the upper limit of the liquid level, and then the heating water tank is controlled to stop replenishing water; The first preset margin is less than the third preset margin and less than the second preset margin.

12. The control method according to claim 7, characterized in that: The control method further includes: Determining whether the liquid level of the thermal insulation water tank drops to a set liquid level and the liquid level of the heating water tank drops to a lower liquid level limit; If yes, the heating water tank is controlled to start replenishing water until the liquid level in the heating water tank rises to the upper limit of the liquid level, and then the heating water tank is controlled to stop replenishing water.

13. The control method according to claim 7, characterized in that: The control method further includes: Determine whether the liquid level of the heating water tank has dropped to the lower limit; If yes, the first heating cycle is controlled to be closed.

14. The control method according to claim 7, characterized in that: The control method further includes: Determining whether the temperature in the heating water tank is greater than or equal to a first set temperature plus a first preset margin and less than or equal to the first set temperature plus a second preset margin, and whether the liquid level in the heating water tank reaches an upper liquid level limit; If so, the water in the heating water tank is controlled to flow out to the thermal insulation water tank until the liquid level in the heating water tank drops to the lower liquid level limit or the liquid level in the thermal insulation water tank reaches the upper liquid level limit.

15. The control method according to claim 7, characterized in that: The control method further includes: Determine whether the current period is a concentrated water use period or a non-concentrated water use period; wherein the concentrated water use period and the non-concentrated water use period are determined based on the user's water use habits; If it is during the concentrated water use period, the set liquid level of the thermal insulation water tank adopts the first set liquid level; If it is during a non-centralized water usage period, the set liquid level of the thermal insulation water tank adopts the second set liquid level; Wherein, the second set liquid level is lower than the first set liquid level.

16. The control method according to claim 15, characterized in that: The control method further includes: When the set liquid level of the thermal insulation water tank adopts the first set liquid level, it is determined whether the liquid level of the thermal insulation water tank is reduced to the set liquid level and the liquid level of the heating water tank is reduced to the lower liquid level limit. If so, it is determined whether the temperature of the heating water tank reaches the first set temperature plus the second preset margin; if so, the heating water tank is controlled to start replenishing water; if not, the first heating cycle and the third heating cycle are controlled to start, and until the temperature of the heating water tank reaches the first set temperature plus the second preset margin, the heating water tank is controlled to start replenishing water; When the set liquid level of the insulated water tank adopts the second set liquid level, determine whether the liquid level of the insulated water tank is reduced to the set liquid level and the liquid level of the heating water tank is reduced to the lower limit of the liquid level. If so, control the heating water tank to replenish water. After the liquid level of the heating water tank reaches the upper limit of the liquid level, control the first heating cycle to start.

17. The control method according to claim 7, characterized in that: The control method further includes: Detect the outdoor ambient temperature and the return water temperature at the user's water outlet; If the outdoor ambient temperature is less than a preset threshold and the return water temperature at the user water outlet is less than or equal to a fourth set temperature, the fourth heating cycle is controlled to start; wherein the fourth heating cycle is a water circulation between the user water outlet and the thermal insulation water tank; Determining whether the return water temperature at the user's water outlet is greater than a fourth set temperature plus a fourth preset margin; If yes, the fourth heating cycle is controlled to be turned off.

18. The control method according to claim 7, characterized in that: The control method further includes: Obtaining the water supply pressure of the pipeline between the thermal insulation water tank and the user's water outlet; If the water supply pressure is less than the first preset pressure, controlling the frequency increase of the fourth water pump on the pipeline between the first water outlet of the thermal insulation water tank and the user water outlet; If the water supply pressure is less than or equal to the second preset pressure and greater than or equal to the first preset pressure, controlling the fourth water pump to maintain the current frequency; If the water supply pressure is greater than the second preset pressure, the fourth water pump is controlled to reduce its frequency until the water supply pressure is less than or equal to the second preset pressure and greater than or equal to the first preset pressure, or after the fourth water pump is reduced to the lower frequency limit, the fourth water pump is controlled to maintain the current frequency; After the fourth water pump drops to the lower frequency limit, it is determined whether the water supply pressure reaches a third preset pressure; if so, the fourth water pump is controlled to be turned off until the water supply pressure is less than the first preset pressure, the fourth water pump is controlled to be turned on and run at the lowest frequency, and then the frequency of the fourth water pump is triggered to increase until the water supply pressure is greater than the second preset pressure, the fourth water pump is controlled to decrease in frequency until the water supply pressure is less than or equal to the second preset pressure and greater than or equal to the first preset pressure, and the fourth water pump is controlled to maintain the current frequency unchanged; The third preset pressure is greater than the second preset pressure and greater than the first preset pressure.

19. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 7 to 18 is implemented.

20. An electronic device, characterized in that: include: one or more processors; A storage device for storing one or more programs, which, when executed by the one or more processors, causes the one or more processors to implement the method according to any one of claims 7 to 18.

Images