Double-water-tank hot water system and control method thereof

Abstract

The invention discloses a double-water-tank hot water system and a control method thereof. The system comprises a heat pump unit, a heating water tank, a heat pump water tank, a heat pump water tank, a heat pump water tank, a heat pump water tank, a heat pump water tank and a heat pump water tank, and the heat pump water tank is arranged in the heat pump water tank; a second water outlet of the heating water tank is communicated with a water inlet of the heat preservation water tank; the first end of the water supplementing pipeline is communicated with a cold water source, and the second end is communicated with the second water inlet of the heating water tank; the first end of the anti-freezing pipeline is communicated between the first water outlet of the heating water tank and the water inlet of the heat pump unit, and the second end of the anti-freezing pipeline is communicated to the water supplementing pipeline; and a water outlet of the heat preservation water tank is communicated with a user side. According to the invention, no extra electric heating device is needed, and the cost and energy can be saved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and in particular to a double-tank hot water system and a control method thereof. Background Art

[0002] The current hot water system consists of a hot water unit, a water tank, a pump unit, etc. The water tank can relieve the pressure on the unit and reduce the installed capacity of the hot water unit when the water demand increases suddenly during peak hours. In order to meet the user's hot water temperature requirements, the conventional hot water system is equipped with an additional unit for water tank insulation. The measured data shows that the insulation energy consumption accounts for about 20% of the total energy consumption of the system, and the insulation unit is used less frequently; and after the insulation unit is configured, the system structure is complex and difficult to control. In order to prevent the low outdoor temperature in winter from freezing the water supply pipeline and affecting the normal operation of the system, the existing pipeline system generally uses auxiliary heating devices such as heating belts to achieve pipeline antifreeze. This method has the problems of high cost and high energy consumption.

[0003] In the prior art, hot water systems use auxiliary heating devices such as heating tapes to achieve antifreeze of water supply pipelines, but this has high costs and energy consumption, and no effective solution has been proposed so far. Summary of the invention

[0004] The embodiment of the present invention provides a dual-tank hot water system and a control method thereof to solve the problem of high cost and energy consumption in the prior art that the hot water system uses auxiliary heating devices such as heating belts to achieve antifreeze of the water supply pipeline.

[0005] In order to solve the above technical problems, the present invention provides a double water tank hot water system, which comprises:

[0006] A heat pump unit, whose water outlet is connected to the first water inlet of the heating water tank, and whose water inlet is connected to the first water outlet of the heating water tank;

[0007] The second water outlet of the heating water tank is connected to the water inlet of the insulation water tank;

[0008] A water supply pipeline, a first end of which is connected to a cold water source, and a second end of which is connected to a second water inlet of the heating water tank;

[0009] An antifreeze pipeline, a first end of which is connected between the first water outlet of the heating water tank and the water inlet of the heat pump unit, and a second end of which is connected to the water supply pipeline;

[0010] The water outlet of the thermal insulation water tank is connected to the user end.

[0011] Furthermore, the volume of the thermal insulation water tank is an integer multiple of the volume of the heating water tank.

[0012] Furthermore, the system further comprises:

[0013] A water supply valve is arranged on the water supply pipeline;

[0014] A heating valve is arranged on a pipeline between a water inlet of the heat pump unit and a first water outlet of the heating water tank;

[0015] An antifreeze valve is arranged on the antifreeze pipeline;

[0016] The water supply valve is arranged on the pipeline between the second water outlet of the heating water tank and the water inlet of the thermal insulation water tank.

[0017] Furthermore, the system further comprises:

[0018] A water return pipeline, a first end of which is connected to the user end, and a second end of which is connected to the third water inlet of the heating water tank;

[0019] The water return valve is arranged on the water return pipeline.

[0020] Furthermore, the system further comprises:

[0021] The first water pump group is arranged on the pipeline between the water inlet of the heat pump group and the first water outlet of the heating water tank, and the first water pump group includes two parallel water pumps.

[0022] Furthermore, the system further comprises:

[0023] The second water pump group is arranged on the pipeline between the water outlet of the thermal insulation water tank and the user end, and the second water pump group includes two parallel water pumps.

[0024] Furthermore, the insulation water tank is disposed at a lower position in the vertical direction than the heating water tank.

[0025] The present invention also provides a control method, which is applied to the above-mentioned double-tank hot water system, and the control method comprises:

[0026] Determine whether the current period is a low water consumption period. If not, control the heating water tank to start water replenishment and control the heat pump unit to start. After the liquid level in the heating water tank reaches the full liquid level, obtain the water temperature of the water replenishment pipeline at intervals of a first preset time;

[0027] Determining whether the water temperature of the water supply pipeline is less than or equal to a first preset temperature;

[0028] If yes, then control the antifreeze pipeline between the first water outlet of the heating water tank and the water inlet of the heat pump unit to open;

[0029] If not, the antifreeze pipeline is controlled to be closed.

[0030] Furthermore, after controlling the antifreeze pipeline to be closed, the method further includes:

[0031] Determining whether the water temperature of the heating water tank reaches a second preset temperature;

[0032] If yes, the pipeline between the heating water tank and the insulation water tank is controlled to be opened, thereby controlling the heating water tank to supply water to the insulation water tank;

[0033] After the liquid level in the heating water tank reaches zero, the heat pump unit is controlled to stop, and then, whether the liquid level in the insulation water tank reaches the full liquid level is determined;

[0034] If it is reached, the pipeline between the heating water tank and the insulation water tank is controlled to be closed;

[0035] If not, it triggers a determination as to whether the current period is at a low point in water usage; if not, the heating water tank is controlled to start replenishing water, and the heat pump unit is controlled to start at the same time; after the liquid level in the heating water tank reaches the full level, the water temperature of the water replenishment pipeline and the steps after this step are obtained at intervals of a first preset time.

[0036] Furthermore, after controlling the pipeline between the heating water tank and the insulation water tank to be closed, the method further includes:

[0037] Determining whether the amount of water in the thermal insulation water tank has dropped to the difference between the volume in the thermal insulation water tank and the volume of the heating water tank;

[0038] If yes, the heating water tank is controlled to start replenishing water, and the heat pump unit is controlled to operate at the same time. After the liquid level in the heating water tank reaches the full liquid level, the heating water tank is controlled to stop replenishing water, and then the heat pump unit is controlled to start;

[0039] Determining whether the water temperature of the heating water tank reaches a second preset temperature;

[0040] If it is reached, the pipeline between the heating water tank and the thermal insulation water tank is controlled to be opened, and then the heating water tank is controlled to supply water to the thermal insulation water tank.

[0041] Furthermore, after determining whether the amount of water in the heat preservation water tank has dropped to a difference between the volume in the heat preservation water tank and the volume of the heating water tank, the method further includes:

[0042] If the amount of water in the thermal insulation water tank does not drop to the difference between the volume in the thermal insulation water tank and the volume of the heating water tank, determining whether the water temperature of the thermal insulation water tank is less than a third preset temperature;

[0043] If yes, the return water pipeline between the user end and the heating water tank and the pipeline between the heating water tank and the insulation water tank are controlled to be opened, and the heat pump unit is controlled to be turned on;

[0044] If not, the return water pipeline between the control user end and the heating water tank and the pipeline between the heating water tank and the insulation water tank are controlled to be closed, and the heat pump unit is controlled to be shut down.

[0045] Furthermore, after determining whether the current water consumption is at a low point, the control method further includes:

[0046] If yes, determining whether the water temperature of the water supply pipeline is less than or equal to the first preset temperature and the heat pump unit is not turned on for a second preset time period;

[0047] If the conditions are met, the return water pipeline between the user end and the third water inlet of the heating water tank and the antifreeze pipeline between the first water outlet of the heating water tank and the water inlet of the heat pump unit are controlled to be opened; after the liquid level of the heating water tank reaches the full liquid level, the return water pipeline is controlled to be closed;

[0048] If it is not satisfied, the return water pipeline between the control user end and the third water inlet of the heating water tank and the antifreeze pipeline between the first water outlet of the heating water tank and the water inlet of the heat pump unit are controlled to be closed;

[0049] After a third preset time interval, the above steps are repeated.

[0050] Furthermore, the method further comprises:

[0051] Determining whether the water temperature of the heating water tank is greater than a fourth preset temperature;

[0052] If not, the water circulation between the heating water tank and the heat pump unit is controlled to be opened, and the heat pump unit is controlled to be turned on.

[0053] 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.

[0054] The present invention also provides an electronic device, comprising:

[0055] one or more processors;

[0056] 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.

[0057] By applying the technical solution of the present invention, an antifreeze pipeline is set, and the first end of the antifreeze pipeline is connected between the first water outlet of the heating water tank and the water inlet of the heat pump unit, and the second end of the antifreeze pipeline is connected to the water supply pipeline, so that a water circulation is formed among the antifreeze pipeline, the water supply pipeline and the heating water tank. When the temperature drops to a certain range, the water circulation among the antifreeze pipeline, the water supply pipeline and the heating water tank causes the water temperature of the water supply pipeline to rise. The heat pump unit and the heating water tank are used to antifreeze the water supply pipeline, and there is no need to set up an additional electric heating device, thereby saving cost and energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 is a structural diagram of a double-tank hot water system according to an embodiment of the present invention;

[0059] Figure 2 is a flow chart of a control method according to an embodiment of the present invention;

[0060] Figure 3 is a flow chart of a control method for a non-water use valley period according to an embodiment of the present invention;

[0061] Figure 4 is a flow chart of a control method for a non-water use valley period according to an embodiment of the present invention;

[0062] Figure 5 FIG. 4 is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0063] 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.

[0064] 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.

[0065] 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.

[0066] It should be understood that although the terms first, second, third, etc. may be used to describe the preset temperatures in the embodiments of the present invention, these preset temperatures should not be limited to these terms. These terms are only used to distinguish different preset temperatures. For example, without departing from the scope of the embodiments of the present invention, the first preset temperature may also be referred to as the second preset temperature, and similarly, the second preset temperature may also be referred to as the first preset temperature.

[0067] 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.

[0068] 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.

[0069] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0070] Example 1

[0071] In view of the problem that the hot water system in the prior art uses auxiliary heating devices such as heating belts to achieve antifreeze of the water supply pipeline, which has high cost and energy consumption, this embodiment provides a double water tank hot water system. Figure 1 is a structural diagram of a double water tank hot water system according to an embodiment of the present invention, as shown in Figure 1 As shown, the double water tank hot water system includes:

[0072] A heat pump unit 1, whose water outlet is connected to the first water inlet of the heating water tank, and whose water inlet is connected to the first water outlet of the heating water tank; a heating water tank 2, whose second water outlet is connected to the water inlet of the insulation water tank 3; a water supply pipeline 4, whose first end is connected to the cold water source, and whose second end is connected to the second water inlet of the heating water tank 2; an antifreeze pipeline 5, whose first end is connected to between the first water outlet of the heating water tank 2 and the water inlet of the heat pump unit 1, and whose second end is connected to the water supply pipeline 4; the insulation water tank 3, whose water outlet is connected to the user end 6.

[0073] Through the above-mentioned connection relationship, a water circulation is formed among the antifreeze pipeline 5, the water supply pipeline 4, and the heating water tank 2. When the temperature T3 of the water supply pipeline 4 drops to a certain range, resulting in the risk of the water supply pipeline 4 being frozen, the temperature of the water supply pipeline 4 is increased through the water circulation among the antifreeze pipeline 5, the water supply pipeline 4, and the heating water tank 2. At the same time, a water circulation is also formed between the heating water tank 2 and the heat pump unit 1. After the temperature of the heating water tank 2 drops, the heat pump unit 1 heats the heating water tank 2.

[0074] The dual-tank hot water system of this embodiment is provided with an antifreeze pipeline 5, and the first end of the antifreeze pipeline 5 is connected between the first water outlet of the heating water tank 2 and the water inlet of the heat pump unit 1, and the second end of the antifreeze pipeline 5 is connected to the water supply pipeline 4, so that a water circulation is formed among the antifreeze pipeline 5, the water supply pipeline 4, and the heating water tank 2. When the temperature drops to a certain range, the temperature of the water supply pipeline 4 is increased through the water circulation among the antifreeze pipeline 5, the water supply pipeline 4, and the heating water tank 2, and the heat pump unit 1 and the heating water tank 2 are used to realize the antifreeze of the water supply pipeline, without the need to set up an additional electric heating device, thereby saving cost and energy.

[0075] The energy consumption of the unit in the hot water system accounts for about 80% of the total energy consumption of the system. Reducing the energy consumption of the hot water unit is an effective way to achieve energy saving in the system. For the hot water unit, the inlet and outlet water temperatures of the hot water directly affect the condensing temperature of the unit, which in turn affects the performance of the unit. Studies have shown that when the target heating temperature of the hot water is constant, the COP increases by 0.02 for every 1°C decrease in the inlet water temperature of the unit. In order to ensure that the water in the water tank can be completely emptied each time it is heated, and to achieve that each heating is to heat the hot water from cold water to the target temperature, thereby improving thermal efficiency, the volume of the insulation water tank is an integer multiple of the volume of the heating water tank.

[0076] In order to realize the opening and closing control of the pipeline, Figure 1 As shown, the above-mentioned dual water tank hot water system also includes: a water supply valve F1, which is arranged on the water supply pipeline 4; a heating valve F2, which is arranged on the pipeline between the water inlet of the heat pump unit and the first water outlet of the heating water tank; an antifreeze valve F3, which is arranged on the antifreeze pipeline; a water supply valve F4, which is arranged on the pipeline between the second water outlet of the heating water tank and the water inlet of the insulation water tank.

[0077] Since the pipeline between the insulated water tank 3 and the user water outlet 6 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 produced immediately. In order to avoid the water in the water supply pipeline from becoming cold, resulting in the inability to immediately produce hot water, in order to avoid the above problem, the above-mentioned dual-tank hot water system also includes: a return water pipeline 7, a first end of which is connected to the user end 6, and a second end of which is connected to the third water inlet of the heating water tank 2; a return water valve F5, which is arranged on the return water pipeline 7.

[0078] In order to provide power for the water circulation between the heat pump unit 1 and the heating water tank 2, the above-mentioned dual-tank hot water system also includes: a first water pump group B1, which is arranged on the pipeline between the water inlet of the heat pump unit and the first water outlet of the heating water tank. In order to enhance the driving force, the first water pump group B1 includes two parallel water pumps.

[0079] In order to provide power for the insulated water tank 3 to the user end 6, the above-mentioned dual water tank hot water system also includes: a second water pump group B2, which is arranged on the pipeline between the water outlet of the insulated water tank and the user end. In order to enhance the driving force, the second water pump group B2 includes two parallel water pumps.

[0080] If the insulated water tank 3 and the heating water tank 2 are arranged flush in vertical height, or the insulated water tank 3 is arranged higher in vertical direction than the heating water tank 2, then when the heating water tank 2 supplies water to the insulated water tank 3, it needs to be driven by a water pump. In order to save components, the insulated water tank 3 is arranged lower in vertical direction than the heating water tank 2, and the water flow is driven by gravity without the need for a water pump.

[0081] Example 2

[0082] This embodiment provides a control method, which is applied to the above-mentioned double-tank hot water system. 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:

[0083] S101, determine whether the current water usage is at a low point. If not, control the heating water tank to start replenishing water, and at the same time control the heat pump unit to start. After the liquid level in the heating water tank reaches the full level, obtain the temperature of the water replenishment pipeline at intervals of a first preset time.

[0084] During a period of time, such as a day, users do not need water all the time. There will be periods of frequent water use, which are called peak water use periods. Correspondingly, there will be periods of less water use or even no water use, which are called low water use periods. If it is during the low water use period, it means that the user's water demand is small or there is no water demand, and antifreeze operation can be performed. However, if it is not during the low water use period, the user's water demand should also be met when performing the antifreeze operation. In order not to affect the user's water use, the temperature of the water supply pipeline is obtained at every first preset time interval, and then the antifreeze operation is performed according to the temperature of the water supply pipeline.

[0085] S102, determining whether the temperature of the water supply pipeline is less than or equal to a first preset temperature.

[0086] If the temperature of the water supply pipeline is low, the water supply pipeline may be frozen, so it is necessary to first determine whether the temperature of the water supply pipeline is less than or equal to a first preset temperature. The first preset temperature can be determined through experiments.

[0087] S103, if yes, control the antifreeze pipeline between the first water outlet of the heating water tank and the water inlet of the heat pump unit to open.

[0088] After the antifreeze pipeline between the first water outlet of the heating water tank and the water inlet of the heat pump unit is opened, the water circulation between the antifreeze pipeline, the water supply pipeline and the heating water tank is opened, which can provide

[0089] S104, if not, then control the above antifreeze pipeline to be closed.

[0090] The control method of this embodiment controls the antifreeze pipeline between the first water outlet of the heating water tank and the water inlet of the heat pump unit to open when the temperature of the water supply pipeline is too low and there is a risk of freezing. The heat pump unit and the heating water tank are used to antifreeze the water supply pipeline, without the need for an additional electric heating device, thus saving cost and energy.

[0091] In order to ensure the water temperature in the insulated water tank and take into account the heat loss during the transportation process, it is necessary to make the water temperature of the heating water tank reach a certain preset temperature. Therefore, after controlling the antifreeze pipeline to be closed, the above control method also includes: judging whether the water temperature T1 of the heating water tank reaches the second preset temperature; if so, controlling the pipeline between the heating water tank and the insulated water tank to be opened, and then controlling the heating water tank to supply water to the insulated water tank; after the liquid level in the heating water tank reaches zero, controlling the heat pump unit to shut down, and then judging whether the liquid level in the insulated water tank reaches the full level; if reached, controlling the pipeline between the heating water tank and the insulated water tank to be closed; if not reached, triggering the above step S101 and the steps after this step, that is, judging whether it is currently in a low water consumption period, if not, controlling the heating water tank to start replenishing water, and at the same time controlling the heat pump unit to start, after the liquid level in the heating water tank reaches the full level, obtaining the water temperature T3 of the replenishing water pipeline and the steps after this step at every first preset time interval.

[0092] As mentioned above, the energy consumption of the units in the hot water system accounts for about 80% of the total energy consumption of the system. Reducing the energy consumption of the hot water units is an effective way to achieve energy saving in the system. For hot water units, the inlet and outlet water temperatures of the hot water directly affect the condensing temperature of the unit, which in turn affects the performance of the unit. Studies have shown that when the target heating temperature of the hot water is constant, the COP increases by 0.02 for every 1°C decrease in the inlet water temperature of the unit. In order to ensure that the water in the heating water tank can be completely emptied each time, and to achieve that each heating is to heat the hot water from cold water to the target temperature, and to improve thermal efficiency, it is necessary to replenish the water in the insulation water tank every time the volume of the heating water tank is reduced by the same amount. Therefore, after controlling the pipeline between the heating water tank and the insulation water tank to be closed, the above control method also includes:

[0093] Determine whether the amount of water in the insulated water tank has dropped to the difference between the volume in the insulated water tank and the volume in the heating water tank. It should be noted that the volume change in the insulated water tank can be achieved by detecting the liquid level. In specific implementation, the volume change of the same amount as the volume of the hot water tank can be converted into the corresponding liquid level change of the insulated water tank, and then determine whether the amount of water in the insulated water tank has dropped to the difference between the volume in the insulated water tank and the volume in the heating water tank by detecting the liquid level change in the insulated water tank, that is, the water equivalent to the volume of a heating water tank is just used up.

[0094] If the amount of water in the insulated water tank drops to the difference between the volume of the insulated water tank and the volume of the heating water tank, the heating water tank is controlled to start replenishing water, and the heat pump unit is controlled to run at the same time. After the liquid level in the heating water tank reaches the full liquid level, the heating water tank is controlled to stop replenishing water, and then the heat pump unit is controlled to start; determine whether the water temperature T1 of the heating water tank reaches the second preset temperature; if reached, control the pipeline between the heating water tank and the insulated water tank to be opened, and then control the heating water tank to supply water to the insulated water tank.

[0095] In order to ensure that the water temperature T2 of the insulated water tank is always within a certain range and realize constant temperature water supply, after judging whether the water amount in the insulated water tank has dropped to the difference between the volume in the insulated water tank and the volume in the heating water tank, the method also includes: if the water amount in the insulated water tank has not dropped to the difference between the volume in the insulated water tank and the volume in the heating water tank, judging whether the water temperature T2 of the insulated water tank is less than the third preset temperature; if it is less than, controlling the return water pipeline between the user end and the heating water tank and the pipeline between the heating water tank and the insulated water tank to be opened, and controlling the heat pump unit to start; if it is not less than, controlling the return water pipeline between the user end and the heating water tank and the pipeline between the heating water tank and the insulated water tank to be closed, and controlling the heat pump unit to shut down.

[0096] As mentioned above, if it is in the low water usage period, it means that the user has little or no water demand, and the anti-freeze operation can be performed by heating the water tank. Since there is little or no water demand at this time, the hot water in the insulated water tank can also be used for anti-freeze. Therefore, after determining whether it is currently in the low water usage period, the above control method also includes: if it is in the low water usage period, determining whether the water temperature T3 of the water supply pipeline is less than or equal to the first preset temperature and the heat pump unit has not been turned on for a second preset time; if it is satisfied, it indicates that the water supply pipeline is at risk of freezing, and at this time, the user is controlled The return water pipeline between the user end and the third water inlet of the heating water tank and the antifreeze pipeline between the first water outlet of the heating water tank and the water inlet of the heat pump unit are opened, and the feed water pipeline is heated by the hot water in the heating water tank and the insulation water tank; after the liquid level in the heating water tank reaches the full liquid level, the return water pipeline is controlled to be closed; if not met, it indicates that there is no risk of freezing of the feed water pipeline, and the return water pipeline between the user end and the third water inlet of the heating water tank and the antifreeze pipeline between the first water outlet of the heating water tank and the water inlet of the heat pump unit are controlled to be closed; after an interval of a third preset time, the above steps are repeated.

[0097] If the water temperature T1 of the heating water tank reaches a lower temperature, the antifreeze effect can no longer be achieved. In order to avoid the water supply pipeline from being frozen at this time, the above-mentioned control method also includes: judging whether the water temperature T1 of the heating water tank is greater than the fourth preset temperature; if not, controlling the water circulation between the heating water tank and the heat pump unit to be opened, and controlling the heat pump unit to start; if yes, controlling the water circulation between the heating water tank and the heat pump unit to be closed, and controlling the heat pump unit to shut down; since the fourth temperature is the temperature to ensure that the heating water tank achieves the antifreeze effect, and the second preset temperature is the temperature to ensure that the user uses hot water, the fourth preset temperature is lower than the second preset temperature.

[0098] Example 3

[0099] This embodiment provides another control method, which is applied to the upper water tank hot water system of the above embodiment. Figure 3 Flow chart of the control method of the non-water use valley period according to an embodiment of the present invention. Figure 3 As shown, the control method includes:

[0100] S31, open the water replenishment valve F1 and replenish water until the heating water tank is full.

[0101] In the initial state, there is no liquid level in the heating water tank and the insulation water tank.

[0102] S32, control the water supply valve F1 to close, start the unit and water pump group B1, and open the heating valve F2.

[0103] S33, determine whether the water temperature T4 in the water supply pipeline meets the requirement of <= 2°C; if yes, execute step S34; if no, execute step S35.

[0104] S34, open the antifreeze valve F3, and after 10 minutes, repeat step S33.

[0105] After the antifreeze valve F3 is opened, part of the high-temperature return water in the heating water tank enters the heat pump unit to continue heating, and the remaining part passes through the antifreeze valve F3 and is sent to the heating water tank via the water supply pipeline, completing an antifreeze cycle of the water supply pipeline.

[0106] S35, close the antifreeze valve F4, and then determine whether the water temperature T1 of the heating water tank is greater than the second preset temperature; if yes, execute step S36; if not, repeat step S37.

[0107] S36, control the heat pump unit to stop, control the water supply valve F4 to open, and control the water pump unit B2 to start.

[0108] S37, after the liquid level in the heating water tank reaches zero, control the heat pump unit to shut down, and then determine whether the liquid level in the insulation water tank reaches the full level; if yes, execute step S38; if not, execute step S315.

[0109] S38, control the water supply valve F4 to close.

[0110] S39, determine whether the amount of water in the insulated water tank has dropped to the difference between the volume in the insulated water tank and the volume of the heating water tank; if yes, execute step S310, if not, execute step S312.

[0111] S310, control the water supply valve F1 to open until the liquid level in the heating water tank reaches the full liquid level and then control the water supply valve F1 to close.

[0112] S311, control the heat pump unit to start, control the heating valve F2 to start, control the water pump unit B1 to start, and then return to step S35.

[0113] S312, determine whether the water temperature T2 of the thermal insulation water tank is less than the third preset temperature; if yes, execute step S313; if not, execute step S314.

[0114] S313, control the water supply valve F4 and the return valve F5 to open, and control the water pump group B2 and the heat pump unit to start.

[0115] S314, control the heat pump unit to stop, control the water pump unit B2 to turn off, and control the water supply valve F4 to turn off.

[0116] S315, control the water supply valve F4 to close, and then return to step S31.

[0117] Figure 4 Flow chart of the control method of the non-water use valley period according to an embodiment of the present invention. Figure 4 As shown, the control method includes:

[0118] S41, determine whether T4≤2℃ and the unit has not been turned on for t consecutive minutes; if yes, execute step S42; if not, repeat step S41.

[0119] S42, control the water pump group B1, the water pump group B2 to start, control the antifreeze valve F3, and the return water valve F5 to open, and after 10 minutes, return to step S41.

[0120] Monitor the water temperature T4 in the water supply pipeline. If the temperature is not higher than 2°C and the unit has not been turned on for t consecutive minutes to perform the heating or insulation function, turn on the water pump, turn on the water pump group B1 and B2, open the antifreeze valve F3, close the water supply valve F1, the water supply valve F4, and the heating valve F2, and let the water in the insulation water tank flow through the water pump group B2 and the return valve F5 into the heating water tank, and then flow into the water supply pipeline through the water pump group B1 and the antifreeze valve F3 to heat the water supply pipeline and achieve the purpose of antifreeze.

[0121] During the low water consumption period, the hot water in the heating water tank is used for antifreeze. The hot water in the heating water tank flows into the water supply pipeline through the antifreeze pipeline. The above antifreeze steps are performed once every 10 minutes (the time can be adjusted according to actual needs) to prevent the water supply pipeline from freezing. During the low water consumption period, hot water is still stored in the insulation water tank. At this time, the hot water in the insulation water tank can also be used to prevent the water supply pipeline from freezing. The return valve F5 is opened, and the high-temperature return water in the insulation water tank is sent back to the heating water tank through the return valve F5, and then flows into the water supply pipeline through the antifreeze pipeline to heat the water supply pipeline.

[0122] S43, determine whether the liquid level of the heating water tank reaches the full level; if yes, execute step S44; if not, repeat step S43.

[0123] S44, control the return valve F5 and the water pump group B2 to close.

[0124] When the heating water tank reaches the full liquid level, close the return valve F5 and the water pump group B2.

[0125] S45, determining whether the water temperature T1 of the heating water tank is less than a fourth preset temperature; if yes, executing step S46; if no, repeating step S45.

[0126] S46, control the heat pump unit to start, and control the heating valve F2 to open.

[0127] When the water temperature in the heating water tank is lower than the fourth preset temperature, it indicates that the water temperature T1 in the heating water tank is insufficient to realize the antifreeze function. The unit is turned on to heat the water in the heating water tank. After the unit is turned on to heat the water in the heating water tank to a temperature higher than the set temperature, the hot water circulation is completed at the set time interval to realize the intelligent and reliable antifreeze of the water supply pipeline around the clock.

[0128] The control method of this embodiment replaces the insulation unit function with a heating unit to reduce system configuration, lower initial investment, and improve equipment utilization; a dual water tank system is set up, the heating water tank produces hot water, an energy-saving water replenishment mode is adopted, and the volumes of the heating water tank and the insulation water tank are reasonably designed to ensure that the heating water tank can be completely emptied once the hot water is produced, creating conditions for energy-saving water replenishment, reducing the unit's inlet water temperature, improving the unit's performance, and achieving system energy saving. The timing of water replenishment is determined according to water demand, and a whole tank of cold water is replenished at one time to ensure a low inlet water temperature of the unit and reduce the unit's energy consumption; the insulation water tank stores hot water and is connected to the user side to ensure stable water supply; self-antifreeze is achieved through pipeline design, and the heat of the hot water generated by the system is used to achieve 24-hour pipeline antifreeze, reducing initial investment and saving energy consumption.

[0129] Example 4

[0130] 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.

[0131] Example 5

[0132] This embodiment provides an electronic device, including:

[0133] one or more processors;

[0134] 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.

[0135] Figure 5 FIG. 1 is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. Figure 5 As shown, the electronic device includes:

[0136] One or more processors 510 and memory 520, Figure 5 A processor 510 is taken as an example.

[0137] The electronic device may further include: an input device 530 and an output device 540 .

[0138] The processor 510, the memory 520, the input device 530 and the output device 540 may be connected via a bus or other means. Figure 5 The example of connecting through bus is taken in the following.

[0139] The memory 520 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 510 executes various functional applications and data processing of the server by running the non-volatile software programs, instructions and modules stored in the memory 520, that is, implementing the above method embodiment.

[0140] The memory 520 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 control amplification, etc. In addition, the memory 520 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.

[0141] The input device 530 can 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 540 can include a display device such as a display screen.

[0142] The one or more modules are stored in the memory 520, and when executed by the one or more processors 510, perform the control method in any of the above method embodiments.

[0143] 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.

[0144] The electronic devices of the embodiments of the present invention exist in various forms, including but not limited to:

[0145] (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.

[0146] (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.

[0147] (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.

[0148] (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 a 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, and manageability.

[0149] (5) Other electronic devices with data interaction functions, such as televisions, large-screen cars, etc.

[0150] 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.

[0151] 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 dual-tank hot water system, characterized in that: The system comprises: A heat pump unit, whose water outlet is connected to the first water inlet of the heating water tank, and whose water inlet is connected to the first water outlet of the heating water tank; The second water outlet of the heating water tank is connected to the water inlet of the insulation water tank; A water supply pipeline, a first end of which is connected to a cold water source, and a second end of which is connected to a second water inlet of the heating water tank; An antifreeze pipeline, a first end of which is connected between the first water outlet of the heating water tank and the water inlet of the heat pump unit, and a second end of which is connected to the water supply pipeline; The water outlet of the thermal insulation water tank is connected to the user end.

2. The dual water tank hot water system according to claim 1, characterized in that: The volume of the thermal insulation water tank is an integral multiple of the volume of the heating water tank.

3. The dual water tank hot water system according to claim 1, characterized in that: The system further comprises: A water supply valve is arranged on the water supply pipeline; A heating valve is arranged on a pipeline between a water inlet of the heat pump unit and a first water outlet of the heating water tank; An antifreeze valve is arranged on the antifreeze pipeline; The water supply valve is arranged on the pipeline between the second water outlet of the heating water tank and the water inlet of the thermal insulation water tank.

4. The dual water tank hot water system according to claim 1, characterized in that: The system further comprises: A water return pipeline, a first end of which is connected to the user end, and a second end of which is connected to the third water inlet of the heating water tank; The return water valve is arranged on the return water pipeline.

5. The dual water tank hot water system according to claim 1, characterized in that: The system further comprises: The first water pump group is arranged on the pipeline between the water inlet of the heat pump group and the first water outlet of the heating water tank, and the first water pump group includes two parallel water pumps.

6. The dual-tank hot water system according to claim 1, characterized in that: The system further comprises: The second water pump group is arranged on the pipeline between the water outlet of the thermal insulation water tank and the user end, and the second water pump group includes two parallel water pumps.

7. The dual-tank hot water system according to claim 1, characterized in that: The insulation water tank is disposed at a lower position in the vertical direction than the heating water tank.

8. A control method, applied to the dual-tank hot water system according to any one of claims 1 to 7, characterized in that: The control method comprises: Determine whether the current period is a low water consumption period. If not, control the heating water tank to start water replenishment and control the heat pump unit to start. After the liquid level in the heating water tank reaches the full liquid level, obtain the water temperature of the water replenishment pipeline at intervals of a first preset time; Determining whether the water temperature of the water supply pipeline is less than or equal to a first preset temperature; If yes, then control the antifreeze pipeline between the first water outlet of the heating water tank and the water inlet of the heat pump unit to open; If not, the antifreeze pipeline is controlled to be closed.

9. The control method according to claim 8, characterized in that: After controlling the antifreeze pipeline to be closed, the method further includes: Determining whether the water temperature of the heating water tank reaches a second preset temperature; If yes, the pipeline between the heating water tank and the insulation water tank is controlled to be opened, thereby controlling the heating water tank to supply water to the insulation water tank; After the liquid level in the heating water tank reaches zero, the heat pump unit is controlled to stop, and then it is determined whether the liquid level in the insulation water tank reaches the full liquid level; If it is reached, the pipeline between the heating water tank and the insulation water tank is controlled to be closed; If not, it triggers a determination as to whether the current period is at a low point in water usage; if not, the heating water tank is controlled to start replenishing water, and the heat pump unit is controlled to start at the same time; after the liquid level in the heating water tank reaches the full level, the water temperature of the water replenishment pipeline and the steps after this step are obtained at intervals of a first preset time.

10. The control method according to claim 9, characterized in that: After controlling the pipeline between the heating water tank and the insulation water tank to be closed, the method further includes: Determining whether the amount of water in the thermal insulation water tank has dropped to the difference between the volume in the thermal insulation water tank and the volume of the heating water tank; If yes, the heating water tank is controlled to start replenishing water, and the heat pump unit is controlled to operate at the same time. After the liquid level in the heating water tank reaches the full liquid level, the heating water tank is controlled to stop replenishing water, and then the heat pump unit is controlled to start; Determining whether the water temperature of the heating water tank reaches a second preset temperature; If it is reached, the pipeline between the heating water tank and the thermal insulation water tank is controlled to be opened, and then the heating water tank is controlled to supply water to the thermal insulation water tank.

11. The control method according to claim 10, characterized in that: After determining whether the amount of water in the heat preservation water tank has dropped to a difference between the volume in the heat preservation water tank and the volume of the heating water tank, the method further includes: If the amount of water in the thermal insulation water tank does not drop to the difference between the volume in the thermal insulation water tank and the volume of the heating water tank, determining whether the water temperature of the thermal insulation water tank is less than a third preset temperature; If yes, the return water pipeline between the user end and the heating water tank and the pipeline between the heating water tank and the insulation water tank are controlled to be opened, and the heat pump unit is controlled to be turned on; If not, the return water pipeline between the control user end and the heating water tank and the pipeline between the heating water tank and the insulation water tank are controlled to be closed, and the heat pump unit is controlled to be shut down.

12. The control method according to claim 7, characterized in that: After determining whether the current period is a low water consumption period, the control method further includes: If yes, determining whether the water temperature of the water supply pipeline is less than or equal to the first preset temperature and the heat pump unit is not turned on for a second preset time period; If the conditions are met, the return water pipeline between the user end and the third water inlet of the heating water tank and the antifreeze pipeline between the first water outlet of the heating water tank and the water inlet of the heat pump unit are controlled to be opened; after the liquid level of the heating water tank reaches the full liquid level, the return water pipeline is controlled to be closed; If it is not satisfied, the return water pipeline between the control user end and the third water inlet of the heating water tank and the antifreeze pipeline between the first water outlet of the heating water tank and the water inlet of the heat pump unit are controlled to be closed; After a third preset time interval, the above steps are repeated.

13. The control method according to claim 12, characterized in that: The method further comprises: Determining whether the water temperature of the heating water tank is greater than a fourth preset temperature; If not, the water circulation between the heating water tank and the heat pump unit is controlled to be opened, and the heat pump unit is controlled to be turned on.

14. 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 8 to 13 is implemented.

15. 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, enables the one or more processors to implement the method according to any one of claims 8 to 13.

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