Air energy water heater and control method of air energy water heater

Abstract

The present application relates to the technical field of electrical equipment. The embodiment of the present application discloses an air-energy water heater and a control method for the air-energy water heater. The method determines a target water tank that meets the heating conditions among at least two water tanks; obtains the target current water temperature and the target set water temperature corresponding to the target water tank, and determines the refrigerant circulation flow parameter for the target water tank based on the target current water temperature and the target set water temperature; and controls the opening of the flow control valve corresponding to the target water tank based on the refrigerant circulation flow parameter to heat the target water tank. Thus, the refrigerant circulation flow parameter is determined for the target current water temperature and the target set water temperature corresponding to the target water tank, and then the refrigerant circulation flow parameter is used to control the opening of the flow control valve corresponding to the target water tank, thereby controlling the refrigerant circulation flow, and thus achieving accurate heating for each target water tank.

Description

Technical Field

[0001] The present application relates to the technical field of electrical equipment, and in particular to an air-energy water heater and a control method for the air-energy water heater. Background Art

[0002] In recent years, air-energy water heaters have taken a greater advantage in replacing traditional electric air-energy water heaters and gas-fired air-energy water heaters due to their energy-saving and other advantages. At present, the volume of air-energy water tanks is relatively small, which makes it more expensive to purchase large-capacity air-energy water heaters when users have large-capacity water needs. Summary of the invention

[0003] The embodiments of the present application provide an air-energy water heater and a control method for the air-energy water heater, which can solve the technical problem that the current air-energy water tank has a small volume, resulting in a high cost for purchasing a large-capacity air-energy water heater when the user has a large-capacity water demand.

[0004] In a first aspect, an embodiment of the present application provides an air energy water heater, the air energy water heater comprising:

[0005] At least two water tanks;

[0006] A refrigerant pipeline, wherein the air-to-water heater is provided with a flow control valve, and the flow control valve is used to adjust the refrigerant circulation flow of the refrigerant pipeline;

[0007] The outdoor unit is provided with at least one set of outdoor unit refrigerant interface groups, and each of the water tanks is connected in parallel with the outdoor unit through the refrigerant pipeline and the outdoor unit refrigerant interface group.

[0008] Optionally, the external machine refrigerant interface group includes a pair of external machine refrigerant inlets and external machine refrigerant outlets, the refrigerant pipeline includes a first refrigerant pipeline and a second refrigerant pipeline, the water tank includes a heat exchanger inlet and a heat exchanger outlet, and the heat exchanger inlet is provided with the flow control valve;

[0009] Among them, the outdoor unit refrigerant outlet is connected in parallel with the heat exchanger inlet of each water tank via the first refrigerant pipeline, and each water tank is connected in parallel with the outdoor unit refrigerant inlet of the outdoor unit via the second refrigerant pipeline through the heat exchanger outlet.

[0010] Optionally, the number of the external machine refrigerant interface groups is the same as the number of the water tanks; or,

[0011] The number of the external unit refrigerant interface group and the number of the water tank are different.

[0012] The first refrigerant pipeline is configured with at least one first bifurcated pipe, and the first bifurcated pipe is used to connect the heat exchanger inlets of at least two water tanks;

[0013] The second refrigerant pipeline is configured with at least one second bifurcated pipe, and the second bifurcated pipe is used to connect the heat exchanger outlets of at least two water tanks.

[0014] Optionally, the number of the external machine refrigerant interface group is the same as that of the water tank, the external machine refrigerant interface group includes a pair of external machine refrigerant inlets and external machine refrigerant outlets, the refrigerant pipeline includes a first refrigerant pipeline and a second refrigerant pipeline, the water tank includes a heat exchanger inlet and a heat exchanger outlet, and the external machine refrigerant outlet is configured with the flow control valve;

[0015] The external unit refrigerant outlet is connected in parallel with the heat exchanger inlet of each water tank via the first refrigerant pipeline, and each water tank is connected in parallel with the external unit refrigerant inlet of the outdoor unit via the second refrigerant pipeline through the heat exchanger outlet.

[0016] In a second aspect, an embodiment of the present application provides a control method for an air-energy water heater, the air-energy water heater comprising: at least two water tanks; a refrigerant pipeline, the air-energy water heater is provided with a flow control valve, the flow control valve is used to adjust the refrigerant circulation flow of the refrigerant pipeline; an outdoor unit, the outdoor unit is provided with at least one group of outdoor unit refrigerant interface groups, each of the water tanks is respectively connected in parallel with the outdoor unit through the refrigerant pipeline and the outdoor unit refrigerant interface group, the control method comprises:

[0017] Determine a target water tank that meets the heating condition among the at least two water tanks;

[0018] Obtaining a target current water temperature and a target set water temperature corresponding to the target water tank, and determining a refrigerant circulation flow parameter for the target water tank based on the target current water temperature and the target set water temperature;

[0019] The opening of the flow control valve corresponding to the target water tank is controlled based on the refrigerant circulation flow parameter to supply heat to the target water tank.

[0020] Optionally, determining a target water tank that satisfies the heating condition among the at least two water tanks includes:

[0021] Acquire the current water temperature and the set water temperature of each water tank in the at least two water tanks, and determine the current water temperature difference of each water tank based on the current water temperature and the set water temperature;

[0022] A preset water temperature difference is obtained, a current water temperature difference greater than or equal to the preset water temperature difference is used as a target water temperature difference, and a water tank corresponding to the target water temperature difference is used as a target water tank among the at least two water tanks that meets the heating condition.

[0023] Optionally, determining a refrigerant circulation flow parameter for the target water tank based on the target current water temperature and the target set water temperature includes:

[0024] Determine a target water temperature difference corresponding to each target water tank based on the target current water temperature and the target set water temperature, and determine a reference water temperature difference with a maximum value from the target water temperature differences;

[0025] Obtaining an upper limit parameter of the opening of the flow control valve, and determining a temperature difference ratio between the target water temperature difference and the reference water temperature difference;

[0026] A refrigerant circulation flow parameter for the target water tank is determined based on the opening upper limit parameter and the temperature difference ratio.

[0027] Optionally, determining the refrigerant circulation flow parameter for the target water tank based on the opening upper limit parameter and the temperature difference ratio includes:

[0028] A reference refrigerant circulation flow parameter is obtained based on multiplying the opening upper limit parameter by the temperature difference ratio;

[0029] Acquire a preset initial opening parameter of the flow control valve, and when the reference refrigerant circulation flow parameter is greater than the initial opening parameter, use the reference refrigerant circulation flow parameter as the refrigerant circulation flow parameter of the target water tank;

[0030] When the reference refrigerant circulation flow parameter is less than or equal to the initial opening parameter, the initial opening parameter is used as the refrigerant circulation flow parameter of the target water tank.

[0031] Optionally, the method further comprises:

[0032] Obtain the preset initial opening parameters of the flow control valve to determine whether all the water tanks among the at least two water tanks meet the standby conditions; when all the water tanks among the at least two water tanks meet the standby conditions, control the opening of the flow control valve corresponding to each water tank based on the initial opening parameters.

[0033] Optionally, the determining whether all of the at least two water tanks meet the standby condition includes:

[0034] Obtain a preset water temperature difference, obtain the current water temperature and the set water temperature of each of the at least two water tanks, and when the current water temperature difference between the current water temperature of each of the at least two water tanks and the set water temperature corresponding to the water tank is less than the preset water temperature difference, determine that all of the at least two water tanks meet the standby conditions.

[0035] The beneficial effects brought about by the technical solutions provided in some embodiments of the present application include at least:

[0036] The air-energy water heater includes a refrigerant pipeline, at least two water tanks, an outdoor unit, a flow control valve and an outdoor unit refrigerant interface group. The flow control valve controls the refrigerant circulation flow of the refrigerant pipeline corresponding to the water tank, thereby realizing precise heating control of at least two parallel water tanks by a single outdoor unit. At the same time, the volume of the water tank corresponding to the air-energy water heater is effectively expanded, and the single outdoor unit in the air-energy water heater effectively controls the cost of the air-energy water heater, thereby solving the current technical problem that the volume of the air-energy water tank is small, resulting in a high cost for purchasing a large-capacity air-energy water heater when the user has a large water demand.

[0037] Furthermore, a target water tank that meets the heating conditions is determined among at least two water tanks; a target current water temperature and a target set water temperature corresponding to the target water tank are obtained, and a refrigerant circulation flow parameter for the target water tank is determined based on the target current water temperature and the target set water temperature; and the opening of the flow control valve corresponding to the target water tank is controlled based on the refrigerant circulation flow parameter to heat the target water tank. Thus, the refrigerant circulation flow parameter is determined for the target current water temperature and the target set water temperature corresponding to the target water tank, and then the refrigerant circulation flow parameter is used to control the opening of the flow control valve corresponding to the target water tank, thereby controlling the refrigerant circulation flow, and thus achieving accurate heating for each target water tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 A schematic diagram of the structure of an air-energy water heater provided in an embodiment of the present application;

[0040] Figure 2 A schematic diagram of the structure of another air-energy water heater provided in an embodiment of the present application;

[0041] Figure 3 A schematic diagram of the structure of another air-energy water heater provided in an embodiment of the present application;

[0042] Figure 4 A flow chart of a control method for an air-energy water heater provided in an embodiment of the present application;

[0043] Figure 5 A schematic diagram of a process for determining a target water tank that meets heating conditions provided in an embodiment of the present application;

[0044] Figure 6A schematic diagram of a process for determining refrigerant circulation flow parameters provided in an embodiment of the present application;

[0045] Figure 7 A schematic diagram of a flow chart for determining a refrigerant circulation flow parameter based on an opening upper limit parameter and a temperature difference ratio provided in an embodiment of the present application;

[0046] Figure 8 A schematic structural diagram of a control device for an air-energy water heater provided in an embodiment of the present application.

[0047] Figure numerals: 1000: air energy water heater; 1100: refrigerant pipeline; 1110: first refrigerant pipeline; 1120: second refrigerant pipeline; 1200: water tank; 1210: heat exchanger inlet; 1220: heat exchanger outlet; 1300: outdoor unit; 1400: flow control valve; 1500: outdoor unit refrigerant interface group; 1510: outdoor unit refrigerant inlet; 1520: outdoor unit refrigerant outlet; 1600: temperature sensor; 1000 A: air-energy water heater; 1400A: flow control valve; air-energy water heater; flow control valve; 1500a: external unit refrigerant interface group; 1510a: external unit refrigerant inlet; 1520a: external unit refrigerant outlet; 1100a: refrigerant pipeline; 1110a: first refrigerant pipeline; 1120a: second refrigerant pipeline; 800: control device of air-energy water heater; 810: determination module; 820: acquisition module; 830: heating module. DETAILED DESCRIPTION

[0048] In order to make the features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the embodiments of the present application.

[0049] In the relevant technology, household air-energy water heaters have significant advantages in replacing traditional electric water heaters and gas water heaters due to their constant temperature, large capacity and energy-saving characteristics. It not only improves the user's comfort, but also achieves energy conservation and emission reduction. Usually, the water tank capacity of air-energy water heaters is concentrated in 15L, 200L and 300L, and the maximum capacity usually does not exceed 350L. For those home users or commercial places that need large-capacity water, when the demand reaches 400L to 700L, choosing commercial hot water products may face the problem of high cost and large installation space, resulting in reduced cost performance. In addition, the alternative of installing multiple sets of small-capacity water tanks and outdoor units will also encounter the problem of insufficient installation space and rising costs for outdoor units.

[0050] In order to solve the related technical problems, the embodiment of the present application provides an air-energy water heater and a control method for the air-energy water heater, the air-energy water heater comprising: at least two water tanks; a refrigerant pipeline, the air-energy water heater is equipped with a flow control valve, the flow control valve is used to adjust the refrigerant circulation flow of the refrigerant pipeline; an outdoor unit, the outdoor unit comprises at least one group of outdoor unit refrigerant interface groups, each water tank is connected in parallel with the outdoor unit through the outdoor unit refrigerant interface group via the refrigerant pipeline; the control method comprises: determining a target water tank that meets the heating conditions among at least two water tanks; obtaining the target current water temperature and the target set water temperature corresponding to the target water tank, and determining the refrigerant circulation flow parameters for the target water tank based on the target current water temperature and the target set water temperature; controlling the opening of the flow control valve corresponding to the target water tank based on the refrigerant circulation flow parameters to heat the target water tank. In this way, the opening of the flow control valve corresponding to the target water tank can be controlled by the refrigerant circulation flow parameters, and then at least two water tanks can be heated by a single outdoor unit, solving the technical problem that the current air energy water tank has a small volume, making it expensive to purchase a large-capacity air energy water heater when users have large water needs.

[0051] In a first aspect, the present application provides an air-energy water heater, which is described in detail below.

[0052] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of an air-energy water heater provided in an embodiment of the present application. Figure 1 As shown, the air energy water heater 1000 includes a refrigerant pipeline 1100, at least two water tanks 1200, an outdoor unit 1300, a flow control valve 1400 and an outdoor unit refrigerant interface group 1500. It should be noted that, Figure 1 The position of the medium flow control valve 1400 can be set based on actual needs. Figure 1 The number of the internal and external machine refrigerant interface groups 1500 and the number of the water tanks 1200, as well as the connection relationship between the external machine refrigerant interface groups 1500 and the water tanks 1200 are used for illustration in this embodiment and are not intended to limit this embodiment. The flow control valve 1400 may be an electronic expansion valve.

[0053] Among them, the refrigerant pipeline 1100 is a pipeline for transporting refrigerant (refrigerant). In the air-energy water heater 1000, the refrigerant in the outdoor unit 1300 absorbs heat energy in the air and evaporates to obtain refrigerant vapor. Then the outdoor unit 1300 compresses the refrigerant vapor to generate high-temperature and high-pressure refrigerant vapor. The high-temperature and high-pressure refrigerant vapor is transported to the water tank 1200 with the help of the outdoor unit refrigerant outlet 1520 corresponding to the outdoor unit refrigerant interface group 1500 and the refrigerant pipeline 1100, thereby transferring heat to the water in the water tank 1200 and heating the water in the water tank 1200. Then the condensed refrigerant vapor flows back to the outdoor unit 1300 again with the help of the outdoor unit refrigerant inlet 1510 corresponding to the outdoor unit refrigerant interface group 1500 and the refrigerant pipeline 1100, and starts a new heat transfer process. It is easy to understand that the outdoor unit 1300 and each water tank 1200 form a refrigerant circulation loop through a refrigerant pipeline 1100. Different water tanks 1200 may correspond to different refrigerant pipelines 1100. Different refrigerant pipelines 1100 may share some pipelines or may not share pipelines.

[0054] The number of water tanks 1200 can be at least two, such as two, three, four, and more. The number of water tanks 1200 required to be set in the air energy water heater 1000 can be determined based on the user's demand for the total capacity of the water tanks and the capacity of each water tank. The air energy water heater 1000 is equipped with a flow control valve 1400, which is used to adjust the refrigerant circulation flow of the refrigerant pipeline 1100, thereby controlling the refrigerant circulation flow of the water tank 1200. Based on the control of the refrigerant circulation flow of the water tank 1200, the heating effect of the water tank 1200 can be accurately controlled, thereby accurately controlling the heating temperature of the water tank 1200. At the same time, the flow control valve 1400 for controlling the refrigerant circulation flow of each water tank 1200 can be configured in the air energy water heater 1000, so that the refrigerant circulation flow of each water tank 1200 can be accurately controlled, thereby realizing accurate control of the heating temperature of each water tank 1200.

[0055] It is easy to understand that when the refrigerant circulation flow rate of the refrigerant pipeline 1100 is adjusted based on the flow control valve 1400, when the refrigerant circulation flow rate is larger, the heating effect for the water tank 1200 is better, and the temperature rise rate of the water in the water tank 1200 is faster; when the refrigerant circulation flow rate is smaller, the heating effect for the water tank 1200 is weaker, and the temperature rise rate of the water in the water tank 1200 is slower.

[0056] At the same time, the outdoor unit 1300 is provided with at least one set of external unit refrigerant interface group 1500, and each water tank 1200 is connected in parallel with the outdoor unit 1300 through the refrigerant pipeline 1100 and the external unit refrigerant interface group 1500.

[0057] Exemplarily, when the outdoor unit 1300 is provided with a group of external unit refrigerant interface groups 1500, each water tank 1200 is connected in parallel with the outdoor unit 1300 through the external unit refrigerant interface group 1500 via the refrigerant pipeline 1100, that is, one group of external unit refrigerant interface group 1500 is connected to multiple water tanks 1200, and the multiple water tanks 1200 are connected in parallel with each other in the refrigerant pipeline 1100; when the outdoor unit 1300 is provided with two or more groups of external unit refrigerant interface groups 1500, one group of external unit refrigerant interface groups 1500 can be connected to one or more water tanks 1200. It should be noted that the docking of the external unit refrigerant interface group 1500 and the water tank 1200 can be understood as that, when heating the water tank 1200, the external unit refrigerant outlet 1510 of the external unit refrigerant interface group 1500 is connected to the heat exchanger inlet 1210 of the water tank 1200 by means of the refrigerant pipeline 1100, and the heat exchanger outlet 1220 of the water tank 1200 is connected to the external unit refrigerant inlet 1520 of the external unit refrigerant interface group 1500 by means of the refrigerant pipeline 1100.

[0058] Specifically, when the number of external unit refrigerant interface groups 1500 is the same as the number of water tanks 1200, each group of external unit refrigerant interface groups 1500 can be connected to a water tank 1200, that is, the external unit refrigerant interface groups 1500 and the water tanks correspond one to one; of course, when the number of external unit refrigerant interface groups 1500 is the same as the number of water tanks 1200, each group of external unit refrigerant interface groups 1500 can be connected to one or more water tanks 1200, and there is a situation where the external unit refrigerant interface groups are not in use.

[0059] When the number of external unit refrigerant interface groups 1500 is different from the number of water tanks 1200, such as when the number of external unit refrigerant interface groups 1500 is greater than the number of water tanks 1200, then one external unit refrigerant interface group 1500 can be connected to one or more water tanks 1200; when the number of external unit refrigerant interface groups 1500 is less than the number of water tanks 1200, then there is at least one external unit refrigerant interface group 1500 connected to at least two water tanks 1200.

[0060] In addition, the water tank 1200 and the outdoor unit 1300 can be connected to each other through a signal line (not shown in the figure), and a temperature sensor 1600 can also be provided in the water tank 1200 to collect the current water temperature in the water tank, and then control the flow control valve 1400 of the corresponding water tank 1200 based on the set water temperature and the current water temperature of the corresponding water tank 1200, thereby controlling the refrigerant circulation flow of the corresponding water tank 1200, thereby realizing heating control for the two water tanks 1200.

[0061] In the embodiment provided in the present application, the air-energy water heater 1000 includes a refrigerant pipeline 1100, at least two water tanks 1200, an outdoor unit 1300, a flow control valve 1400 and an outdoor unit refrigerant interface group 1500. The flow control valve 1400 controls the refrigerant circulation flow of the water tank 1200 corresponding to the refrigerant pipeline 1100, thereby realizing precise heating control of at least two parallel water tanks 1200 by a single outdoor unit 1300. At the same time, the volume of the air-energy water heater 1000 corresponding to the water tank 1200 is effectively expanded, and the single outdoor unit 1300 in the air-energy water heater 1000 effectively controls the cost of the air-energy water heater 1000, thereby solving the technical problem that the current air-energy water tank has a small volume, which makes it costly to purchase a large-capacity air-energy water heater when the user has a large water demand.

[0062] In one embodiment provided in the present application, Figure 1 In the illustrated embodiment, the number of the external machine refrigerant interface group 1500 and the water tank 1200 is the same, the external machine refrigerant interface group 1500 includes a pair of external machine refrigerant inlets 1510 and external machine refrigerant outlets 1520, the refrigerant pipeline 1100 includes a first refrigerant pipeline 1110 and a second refrigerant pipeline 1120, the water tank 1200 includes a heat exchanger inlet 1210 and a heat exchanger outlet 1220, and the external machine refrigerant outlet 1520 is equipped with a flow control valve 1400;

[0063] Among them, the external unit refrigerant outlet 1520 is connected in parallel with the heat exchanger inlet 1210 of each water tank 1200 via the first refrigerant pipeline 1110, and each water tank 1200 is connected in parallel with the external unit refrigerant inlet 1510 of the outdoor unit 1300 via the heat exchanger outlet 1220 via the second refrigerant pipeline 1120.

[0064] The number of the external refrigerant interface groups 1500 and the water tank 1200 is the same, and each group of the external refrigerant interface groups 1500 is used to connect to a water tank 1200, and the external refrigerant interface groups 1500 and the water tank 1200 can correspond to each other one by one. Specifically, the external refrigerant interface group 1500 includes a pair of external refrigerant inlets 1510 and an external refrigerant outlet 1520. When the refrigerant flows back, the refrigerant flows into the outdoor unit 1300 from the external refrigerant inlet 1510, and after the outdoor unit 1300 performs heat exchange and compression processing, it flows out of the outdoor unit 1300 again from the external refrigerant outlet 1520 paired with the external refrigerant inlet 1510. The external refrigerant inlet 1510 can be an external low-pressure stop valve, and the external refrigerant outlet 1520 can be an external high-pressure stop valve.

[0065] The water tank 1200 includes a heat exchanger inlet 1210 and a heat exchanger outlet 1220. Since each set of external unit refrigerant interface group 1500 is used to connect to a water tank 1200, the external unit refrigerant outlet 1520 in the pair of external unit refrigerant inlet 1510 and external unit refrigerant outlet 1520 is used to connect to the heat exchanger inlet 1210 of the water tank 1200. Therefore, the external unit refrigerant inlet 1510 in the pair of external unit refrigerant inlet 1510 and external unit refrigerant outlet 1520 is used to connect to the heat exchanger outlet 1220 of the water tank 1200.

[0066] The refrigerant pipeline 1100 includes a first refrigerant pipeline 1110 and a second refrigerant pipeline 1120. The first refrigerant pipeline 1110 can be a connecting pipeline between the external unit refrigerant outlet 1520 and the heat exchanger inlet 1210 of the water tank 1200 which are connected to each other; the second refrigerant pipeline 1120 can be a connecting pipeline between the heat exchanger outlet 1220 of the water tank 1200 and the external unit refrigerant inlet 1510 which are connected to each other.

[0067] At the same time, the external refrigerant outlet 1520 is provided with a flow control valve 1400, which can be arranged at the refrigerant inlet of the external refrigerant outlet 1520 or at the refrigerant outlet of the external refrigerant outlet 1520, such as on the first refrigerant pipeline 1110. Figure 1 As shown, Figure 1 The dotted line portion shows a partial perspective view of the outdoor unit 1300. In the partial perspective area (dotted line area) of the outdoor unit 1300, it is not difficult to see that the flow control valve 1400 is configured at the refrigerant inlet of the outdoor unit refrigerant outlet 1520.

[0068] In addition, the outdoor unit refrigerant outlet 1520 is connected in parallel with the heat exchanger inlet 1210 of each water tank 1200 through the first refrigerant pipeline 1110, which can be understood as: the refrigerant circulation loops where the first refrigerant pipeline 1110 corresponding to the outdoor unit refrigerant outlet 1520 and the heat exchanger inlet 1210 of the water tank 1200 that are connected to each other are in parallel. The refrigerant circulation loop can be understood as the loop formed by the refrigerant flowing out of the outdoor unit 1300 through the outdoor unit refrigerant outlet 1520, the first refrigerant pipeline 1110, the heat exchanger inlet 1210 of the water tank 1200, the second refrigerant pipeline 1120 of the heat exchanger outlet 1220 of the water tank 1200, the outdoor unit refrigerant inlet 1510 of the outdoor unit 1300, and the outdoor unit 1300.

[0069] Furthermore, each water tank 1200 is connected in parallel with the external unit refrigerant inlet 1510 of the outdoor unit 1300 through the heat exchanger outlet 1220 via the second refrigerant pipeline 1120, which can be understood as: the refrigerant circulation loops where the second refrigerant pipelines 1120 corresponding to the mutually connected heat exchanger outlet 1220 and the external unit refrigerant inlet 1510 are located are in a parallel relationship. The refrigerant circulation loop can refer to the above description and will not be repeated here.

[0070] For example, in Figure 1 middle, Figure 1 Three water tanks 1200 are shown in FIG. Figure 1 The structure corresponding to one water tank 1200 is marked in FIG. 1 , and the structures of the other two water tanks 1200 can be referred to accordingly. Figure 1 There are three sets of external refrigerant interface groups 1500, such as Figure 1 On the right side of the middle outdoor unit 1300, three pairs of external unit refrigerant inlets 1510 and external unit refrigerant outlets 1520 are arranged from top to bottom. The external unit refrigerant inlet 1510 is a black inlet symbol, and the external unit refrigerant outlet 1520 is a gray outlet symbol. Figure 1 The device includes three external refrigerant inlets 1510 and three external refrigerant outlets 1520. Figure 1 The external unit refrigerant inlet 1510 and the external unit refrigerant outlet 1520 adjacent from top to bottom are a pair of the external unit refrigerant inlet 1510 and the external unit refrigerant outlet 1520 .

[0071] In the embodiment provided in the present application, the outdoor unit refrigerant outlet 1520 is connected in parallel with the heat exchanger inlet 1210 of each water tank 1200 via the first refrigerant pipeline 1110, and each water tank 1200 is connected in parallel with the outdoor unit refrigerant inlet 1510 of the outdoor unit 1300 via the heat exchanger outlet 1220 via the second refrigerant pipeline 1120, so that each water tank 1200 can correspond to its own refrigerant circulation loop, and at the same time, a flow control valve 1400 is configured at each outdoor unit refrigerant outlet 1520, so that the refrigerant circulation flow of each water tank 1200 corresponding to the refrigerant circulation loop can be accurately controlled based on the flow control valve 1400, thereby realizing precise heating control of at least two parallel water tanks 1200 using a single outdoor unit 1300.

[0072] See also Figure 2 , Figure 2 This is a schematic diagram of the structure of another air-energy water heater provided in the embodiment of the present application. It should be noted that: Figure 2 The number of external unit refrigerant interface groups 1500 and the number of water tanks 1200 in the air-energy water heater 1000A, as well as the connection relationship between the external unit refrigerant interface groups 1500 and the water tanks 1200 are used for illustration in the present embodiment and are not intended to limit the present embodiment.

[0073] The external machine refrigerant interface group 1500 includes a pair of external machine refrigerant inlet 1510 and external machine refrigerant outlet 1520, the refrigerant pipeline 1100 includes a first refrigerant pipeline 1110 and a second refrigerant pipeline 1120, the water tank 1200 includes a heat exchanger inlet 1210 and a heat exchanger outlet 1220, and the heat exchanger inlet 1210 is equipped with a flow control valve 1400A;

[0074] Among them, the external unit refrigerant outlet 1520 is connected in parallel with the heat exchanger inlet 1210 of each water tank 1200 via the first refrigerant pipeline 1110, and each water tank 1200 is connected in parallel with the external unit refrigerant inlet 1510 of the outdoor unit 1300 via the second refrigerant pipeline 1120 through the heat exchanger outlet 1220.

[0075] Specifically, the heat exchanger inlet 1210 is provided with a flow control valve 1400A, and the flow control valve 1400A may be arranged at the inlet of the imported refrigerant corresponding to the heat exchanger inlet 1210 , such as on the first refrigerant pipeline 1110 .

[0076] The refrigerant pipeline 1100 includes a first refrigerant pipeline 1110 and a second refrigerant pipeline 1120. The first refrigerant pipeline 1110 may be a connecting pipeline between the external unit refrigerant outlet 1520 and the heat exchanger inlet 1210 of the water tank 1200 that are connected to each other; the second refrigerant pipeline 1120 may be a connecting pipeline between the heat exchanger outlet 1220 of the water tank 1200 and the external unit refrigerant inlet 1510 that are connected to each other. Different first refrigerant pipelines 1110 may share some or none of the pipelines, and different second refrigerant pipelines 1120 may share some or none of the pipelines.

[0077] In this embodiment, the number of the external unit refrigerant interface group 1500 and the water tank 1200 may be the same or different, and there is no limitation here.

[0078] In the embodiment provided in the present application, the outdoor unit refrigerant outlet 1520 is connected in parallel with the heat exchanger inlet 1210 of each water tank 1200 via the first refrigerant pipeline 1110, and each water tank 1200 is connected in parallel with the outdoor unit refrigerant inlet 1510 of the outdoor unit 1300 via the heat exchanger outlet 1220 via the second refrigerant pipeline 1120, so that each water tank 1200 can correspond to its own refrigerant circulation loop, and at the same time, a flow control valve 1400A is arranged at each heat exchanger inlet 1210, so that the refrigerant circulation flow of each water tank 1200 corresponding to the refrigerant circulation loop can be accurately controlled based on the flow control valve 1400A, thereby realizing precise heating control of at least two parallel water tanks 1200 using a single outdoor unit 1300.

[0079] like Figure 3 As shown, Figure 3This is a schematic diagram of the structure of another air-energy water heater provided in the embodiment of the present application. Figure 2 and Figure 3 ,exist Figure 2 In the air energy water heater 1000A shown, the number of the external machine refrigerant interface groups 1500 is the same as that of the water tanks 1200, and the external machine refrigerant interface groups 1500 correspond to the water tanks 1200 one by one. That is, each external machine refrigerant interface group 1500 is connected to a water tank 1200, and specifically, the external machine refrigerant outlet 1520 in each external machine refrigerant interface group 1500 is connected to the heat exchanger inlet 1210 of the corresponding water tank 1200 through the corresponding first refrigerant pipeline 1110, and each water tank 1200 is connected to the external machine refrigerant inlet 1510 in the external machine refrigerant interface group 1500 corresponding to the outdoor unit 1300 through the heat exchanger outlet 1220 and the second refrigerant pipeline 1120.

[0080] exist Figure 3 In the air-energy water heater 1000a shown, the number of external unit refrigerant interface groups 1500a and water tanks 1200 is different. The first refrigerant pipeline 1110a is configured with at least one first branch pipe 1111, and the first branch pipe 1111 is used to connect the heat exchanger inlet 1210 of at least two water tanks 1200; the second refrigerant pipeline 1120a is configured with at least one second branch pipe 1121, and the second branch pipe 1121 is used to connect the heat exchanger outlet 1220 of at least two water tanks 1200.

[0081] In which, since the external unit refrigerant outlet 1520a is connected in parallel with the heat exchanger inlet 1210 of each water tank 1200 through the first refrigerant pipeline 1110a, each water tank 1200 is connected in parallel with the external unit refrigerant inlet 1510a of the outdoor unit 1300 through the heat exchanger outlet 1220 through the second refrigerant pipeline 1120a. Figure 3 The first refrigerant pipeline 1110a is a connecting pipeline between the external machine refrigerant outlet 1520a and the heat exchanger inlet 1210 of the water tank 1200, and the second refrigerant pipeline 1120a is a connecting pipeline between the heat exchanger outlet 1220 of the water tank 1200 and the external machine refrigerant inlet 1510a. The number of the external machine refrigerant interface groups 1500a can be one group, and the number of the water tanks 1200 can be two, three or more; the number of the external machine refrigerant interface groups 1500a can be N groups, and the number of the water tanks 1200 can be M, N and M are not equal and N and M are both positive integers.

[0082] The first bifurcated pipe 1111 and the second bifurcated pipe 1121 can both be branch pipes, and the branch pipes are used to distribute the refrigerant to different pipes connected to the branch pipes, such as Figure 3As shown, the first bifurcated pipe 1111 connects the heat exchanger inlets 1210 of the two water tanks 1200, and the second bifurcated pipe 1121 connects the heat exchanger outlets 1220 of the two water tanks 1200. In other embodiments, the first bifurcated pipe 1111 can connect the heat exchanger inlets 1210 of three, four or more water tanks 1200, and the second bifurcated pipe 1121 can connect the heat exchanger outlets 1220 of three, four or more water tanks 1200. The first bifurcated pipe 1111 can also be connected to the pipeline connected to the first bifurcated pipe 1111, so as to branch out multiple pipelines, such as Figure 3 As shown in the figure, there are two first bifurcated tubes 1111 (one first bifurcated tube 1111 is schematically marked in the figure) and two second bifurcated tubes 1121 (one second bifurcated tube 1121 is schematically marked in the figure).

[0083] In the embodiment provided in the present application, the heat exchanger inlet 1210 of at least two water tanks 1200 can be connected by a first branch pipe 1111, and the heat exchanger outlet 1220 of at least two water tanks 1200 can be connected by a second branch pipe 1121, so as to achieve the connection of multiple water tanks with a small number of external unit refrigerant interface groups 1500a, and then achieve precise heating control of at least two parallel water tanks 1200 by a single outdoor unit 1300.

[0084] In the second aspect, the present application provides a control method for an air-energy water heater, which can be applied to any of the above-mentioned air-energy water heaters, the air-energy water heater comprising: at least two water tanks; a refrigerant pipeline, the air-energy water heater is equipped with a flow control valve, the flow control valve is used to adjust the refrigerant circulation flow of the refrigerant pipeline; an outdoor unit, the outdoor unit is provided with at least one group of outdoor unit refrigerant interface groups, each water tank is connected in parallel with the outdoor unit through the refrigerant pipeline and the outdoor unit refrigerant interface group, which is described in detail below.

[0085] like Figure 4 As shown, Figure 4 A flow chart of a control method of an air-energy water heater provided in an embodiment of the present application, the control method of the air-energy water heater includes:

[0086] S402: Determine a target water tank that meets the heating conditions among at least two water tanks.

[0087] Among them, in the air energy water heater, when the temperature of the water tank is too low, the water tank needs to be heated. To determine whether the temperature of the water tank is too low, the current water temperature of the water tank can be compared with the set water temperature of the water tank, and the set water temperature of the water tank can be the water temperature that the water tank needs to reach.

[0088] Therefore, the water temperature of at least two water tanks can be monitored, and the current water temperature of each water tank can be collected by using the temperature sensor corresponding to each water tank. The current water temperature and the set water temperature are then compared to determine the target water tank that meets the heating conditions from at least two water tanks. The number of target water tanks can be one or more.

[0089] S404: Obtain the target current water temperature and the target set water temperature corresponding to the target water tank, and determine the refrigerant circulation flow parameter for the target water tank based on the target current water temperature and the target set water temperature.

[0090] Among them, after determining the target water tank, in order to accurately heat the target water tank, the target current water temperature and the target set water temperature corresponding to the target water tank can be obtained. There is a real-time current temperature difference between the target current water temperature and the target set water temperature. Therefore, the target current water temperature and the target set water temperature can be used to determine the refrigerant circulation flow parameters for the target water tank.

[0091] The refrigerant circulation flow parameters are used to control the heating effect on the target water tank. Therefore, after determining the current temperature difference between the target current water temperature and the target set water temperature, the refrigerant circulation flow parameters are flexibly controlled based on the size of the current temperature difference, so that when the current temperature difference of the target water tank is large, the refrigerant circulation flow parameters will also increase accordingly, thereby enhancing the heating effect on the target water tank, shortening the heating time, and giving users a better user experience; when the current temperature difference of the target water tank is small, the refrigerant circulation flow parameters will also decrease accordingly, thereby appropriately weakening the heating effect on the target water tank. At this time, the user perception is not obvious, thereby saving power consumption without affecting the user experience.

[0092] S406: Control the opening of the flow control valve corresponding to the target water tank based on the refrigerant circulation flow parameter to supply heat to the target water tank.

[0093] Among them, after determining the refrigerant circulation flow parameter, the opening of the flow control valve is determined by using the mapping relationship between the refrigerant circulation flow parameter and the opening of the flow control valve. When the refrigerant circulation flow parameter is larger, the corresponding opening of the flow control valve is also larger; when the refrigerant circulation flow parameter is smaller, the corresponding opening of the flow control valve is also smaller. The refrigerant circulation flow parameter is used to control the opening of the flow control valve corresponding to the target water tank, and then control the refrigerant circulation flow. The larger the opening of the flow control valve, the larger the refrigerant circulation flow, and the smaller the opening of the flow control valve, the smaller the refrigerant circulation flow, thereby achieving precise heating for each target water tank.

[0094] In the embodiment provided by the present application, a target water tank that meets the heating conditions is determined among at least two water tanks; the target current water temperature and the target set water temperature corresponding to the target water tank are obtained, and the refrigerant circulation flow parameter for the target water tank is determined based on the target current water temperature and the target set water temperature; the opening of the flow control valve corresponding to the target water tank is controlled based on the refrigerant circulation flow parameter to heat the target water tank. Thus, the refrigerant circulation flow parameter is determined for the target current water temperature and the target set water temperature corresponding to the target water tank, and then the refrigerant circulation flow parameter is used to control the opening of the flow control valve corresponding to the target water tank, thereby controlling the refrigerant circulation flow, and thus achieving accurate heating for each target water tank.

[0095] like Figure 5 As shown, Figure 5 A schematic diagram of a process for determining a target water tank that meets heating conditions is provided in an embodiment of the present application. Figure 5 As shown, determining the target water tank that meets the heating condition among at least two water tanks in S402 includes:

[0096] S502: Obtain the current water temperature and the set water temperature of each water tank in at least two water tanks, and determine the current water temperature difference of each water tank based on the current water temperature and the set water temperature.

[0097] Among them, the current water temperature of each water tank is collected based on the temperature sensor in each water tank, and the preset water temperature of the water tank is obtained at the same time. The set water temperature is the water temperature that the water tank needs to reach. After determining the current water temperature and the set water temperature in each water tank, the current water temperature difference of each water tank is calculated using the current water temperature and the set water temperature. Usually, the set water temperature is greater than or equal to the current water temperature. Therefore, the current water temperature difference of each water tank can be obtained by subtracting the corresponding current water temperature from the set water temperature of each water tank.

[0098] S504: Obtain a preset water temperature difference, take a current water temperature difference greater than or equal to the preset water temperature difference as a target water temperature difference, and take a water tank corresponding to the target water temperature difference as a target water tank among the at least two water tanks that meets the heating condition.

[0099] The preset water temperature difference may be a temperature difference preset by the user, such as 5°C, 10°C, etc., which may be preset based on user needs. If the current water temperature difference is greater than or equal to the preset water temperature difference, it indicates that the current water temperature of the water tank is too low compared to the corresponding set water temperature. Therefore, after determining the preset water temperature difference, the current water temperature difference greater than or equal to the preset water temperature difference is used as the target water temperature difference.

[0100] At the same time, the water tank corresponding to the target water temperature difference is used as the target water tank that meets the heating conditions among the at least two water tanks, thereby heating the target water tank.

[0101] In the embodiment provided in the present application, the water tank among at least two water tanks whose current water temperature is too low compared to the corresponding set water temperature is used as the target water tank, so as to heat the target water tank, and then strengthen the heating when the current temperature of the water tank deviates from the set temperature by a large margin.

[0102] like Figure 6 As shown, Figure 6 A schematic diagram of a process for determining a refrigerant circulation flow parameter provided in an embodiment of the present application. Figure 6 As shown, in S404, the refrigerant circulation flow parameter for the target water tank is determined based on the target current water temperature and the target set water temperature, including:

[0103] S602: Determine a target water temperature difference corresponding to each target water tank based on the target current water temperature and the target set water temperature, and determine a reference water temperature difference with the largest value from among the target water temperature differences.

[0104] After the target water tank is determined, the target current water temperature T and the target set water temperature T corresponding to the target water tank are used. S Calculate the target water temperature difference TT corresponding to each target water tank S .

[0105] For example, each target water tank may be numbered, and the target water tanks may be numbered 1, 2, 3, ..., the target current water temperature of the target water tank with the corresponding number may be expressed as Tn, the target set water temperature of the target water tank with the corresponding number may be expressed as Tsn, and the target water temperature difference of the target water tank with the corresponding number may be expressed as Tn-Tsn. Where n is the number of the target water tank. The reference water temperature difference with the largest value in the target water temperature difference may be (Tn-Tsn) max

[0106] S604: Obtain an upper limit parameter of the opening of the flow control valve, and determine a temperature difference ratio between the target water temperature difference and the reference water temperature difference.

[0107] Among them, the flow control valve has an upper limit of opening, so the upper limit parameter EEV of the flow control valve can be determined max , such as 480 steps, 3000 steps, etc. The temperature difference ratio between the target water temperature difference and the reference water temperature difference can be expressed as (Tn-Tsn) / (Tn-Tsn) max .

[0108] S606: Determine the refrigerant circulation flow parameter for the target water tank based on the opening upper limit parameter and the temperature difference ratio.

[0109] Among them, after determining the upper limit parameter of the opening degree and the temperature difference ratio, the upper limit parameter of the opening degree is multiplied by the temperature difference ratio to obtain the refrigerant circulation flow parameter, such as EEV max ×[(Tn-Tsn) / (Tn-Tsn)max ].

[0110] In the embodiment provided in the present application, the target water temperature difference of each target water tank is used to determine the reference water temperature difference with the largest value, and then the temperature difference ratio between the target water temperature difference and the reference water temperature difference and the opening upper limit parameter are used to determine the refrigerant circulation flow parameter for the target water tank, so that the greater the relative temperature difference among multiple target water tanks, the stronger the corresponding heating effect.

[0111] like Figure 7 As shown, Figure 7 A schematic diagram of a flow chart for determining a refrigerant circulation flow parameter based on an opening upper limit parameter and a temperature difference ratio provided in an embodiment of the present application. Figure 7 As shown, S606 determines the refrigerant circulation flow parameters for the target water tank based on the opening upper limit parameter and the temperature difference ratio, including:

[0112] S702: Obtain a reference refrigerant circulation flow parameter based on the opening upper limit parameter multiplied by the temperature difference ratio.

[0113] Among them, the upper limit parameter of the opening degree can be EEV max , the temperature difference ratio can be [(Tn-Tsn) / (Tn-Tsn) max ], the reference refrigerant circulation flow parameter can be expressed as EEV max ×[(Tn-Tsn) / (Tn-Tsn) max ].

[0114] S704: Obtain a preset initial opening parameter of the flow control valve, and when the reference refrigerant circulation flow parameter is greater than the initial opening parameter, use the reference refrigerant circulation flow parameter as the refrigerant circulation flow parameter of the target water tank.

[0115] The preset initial opening parameter of the flow control valve can be EEV min , for example, it can be 96 steps. max ×[(Tn-Tsn) / (Tn-Tsn) max ]>EEV min When EEV max ×[(Tn-Tsn) / (Tn-Tsn) max ] as the refrigerant circulation flow parameter corresponding to the target water tank.

[0116] S706: When the reference refrigerant circulation flow parameter is less than or equal to the initial opening parameter, the initial opening parameter is used as the refrigerant circulation flow parameter of the target water tank.

[0117] The preset initial opening parameter of the flow control valve can be EEV min , when EEV max×[(Tn-Tsn) / (Tn-Tsn) max ]≤EEV min When the flow control valve cannot be adjusted to a smaller opening, the EEV min As the refrigerant circulation flow parameter of the target water tank.

[0118] In the embodiment provided in the present application, when the reference refrigerant circulation flow parameter is greater than the initial opening parameter, the reference refrigerant circulation flow parameter is used as the refrigerant circulation flow parameter of the target water tank; when the reference refrigerant circulation flow parameter is less than or equal to the initial opening parameter, the initial opening parameter is used as the refrigerant circulation flow parameter of the target water tank.

[0119] In the embodiment provided in the present application, the control method of the air energy water heater further includes:

[0120] Obtain the preset initial opening parameters of the flow control valve, determine whether all the water tanks in at least two water tanks meet the standby conditions, and when all the water tanks in at least two water tanks meet the standby conditions, control the opening of the flow control valve corresponding to each water tank based on the initial opening parameters.

[0121] Wherein, determining whether all water tanks in at least two water tanks meet the standby condition includes:

[0122] Obtain a preset water temperature difference, obtain the current water temperature and the set water temperature of each of the at least two water tanks. When the current water temperature difference between the current water temperature of each of the at least two water tanks and the set water temperature corresponding to the water tank is less than or equal to the preset water temperature difference, determine that all of the at least two water tanks meet the standby conditions.

[0123] Specifically, the water temperature difference between the current water temperature of each water tank and the set water temperature corresponding to the water tank can be the water temperature difference obtained by subtracting the current water temperature of the corresponding water tank from the set water temperature corresponding to each water tank. If the current water temperature difference is less than the preset water temperature difference, it means that the current water temperature of the water tank is in an appropriate range compared to the corresponding set water temperature, that is, the corresponding temperature is appropriate.

[0124] When there is a water tank among the at least two water tanks that does not meet the standby condition, that is, there is a target water tank among the at least two water tanks, the operations corresponding to the target water tank in the above embodiment can be performed.

[0125] In the embodiment provided in the present application, when all water tanks among at least two water tanks meet the standby conditions, the opening of the flow control valve corresponding to each water tank is controlled based on the initial opening parameters, so that when all water tanks meet the standby conditions, the opening of the flow control valve is controlled based on the initial opening parameters to maintain the temperature of the corresponding water tanks.

[0126] In a third aspect, the embodiment of the present application also provides a control device for an air-energy water heater, the air-energy water heater comprising: at least two water tanks; a refrigerant pipeline, the air-energy water heater is equipped with a flow control valve, the flow control valve is used to adjust the refrigerant circulation flow of the refrigerant pipeline; an outdoor unit, the outdoor unit is provided with at least one set of outdoor unit refrigerant interface groups, each water tank is connected in parallel with the outdoor unit through the refrigerant pipeline and the outdoor unit refrigerant interface group. Figure 8 As shown, Figure 8 The present invention provides a schematic diagram of a control device for an air-energy water heater according to an embodiment of the present invention. The control device 800 for the air-energy water heater includes:

[0127] A determination module 810, adapted to determine a target water tank that meets the heating condition among at least two water tanks;

[0128] An acquisition module 820 is adapted to acquire a target current water temperature and a target set water temperature corresponding to a target water tank, and determine a refrigerant circulation flow parameter for the target water tank based on the target current water temperature and the target set water temperature;

[0129] The heating module 830 is suitable for controlling the opening of the flow control valve corresponding to the target water tank based on the refrigerant circulation flow parameter to heat the target water tank.

[0130] Optionally, the determination module 810 includes:

[0131] A first acquisition unit, adapted to acquire a current water temperature and a set water temperature of each of the at least two water tanks, and determine a current water temperature difference of each water tank based on the current water temperature and the set water temperature;

[0132] The second acquisition unit is suitable for acquiring a preset water temperature difference, taking a current water temperature difference greater than or equal to the preset water temperature difference as a target water temperature difference, and taking a water tank corresponding to the target water temperature difference as a target water tank among at least two water tanks that meets the heating conditions.

[0133] Optionally, the acquisition module 820 includes:

[0134] A first determining unit is adapted to determine a target water temperature difference corresponding to each target water tank based on a target current water temperature and a target set water temperature, and determine a reference water temperature difference with a maximum value from the target water temperature differences;

[0135] A second determination unit is adapted to obtain an upper limit parameter of the opening of the flow control valve and determine a temperature difference ratio between a target water temperature difference and a reference water temperature difference;

[0136] The third determination unit is adapted to determine a refrigerant circulation flow parameter for a target water tank based on an opening upper limit parameter and a temperature difference ratio.

[0137] Optionally, the third determining unit includes:

[0138] A reference refrigerant circulation flow parameter determination subunit is adapted to obtain a reference refrigerant circulation flow parameter based on multiplying an opening upper limit parameter by a temperature difference ratio;

[0139] The first refrigerant circulation flow parameter determination subunit is adapted to obtain a preset initial opening parameter of the flow control valve, and when the reference refrigerant circulation flow parameter is greater than the initial opening parameter, the reference refrigerant circulation flow parameter is used as the refrigerant circulation flow parameter of the target water tank;

[0140] The second refrigerant circulation flow parameter determination subunit is adapted to use the initial opening parameter as the refrigerant circulation flow parameter of the target water tank when the reference refrigerant circulation flow parameter is less than or equal to the initial opening parameter.

[0141] Optionally, the control device 800 of the air energy water heater further includes:

[0142] The opening control module is suitable for obtaining the preset initial opening parameters of the flow control valve, determining whether all the water tanks in at least two water tanks meet the standby conditions, and when all the water tanks in at least two water tanks meet the standby conditions, controlling the opening of the flow control valve corresponding to each water tank based on the initial opening parameters.

[0143] Optionally, the control device 800 of the air-energy water heater also includes: a standby condition judgment module, suitable for obtaining a preset water temperature difference, obtaining the current water temperature of each water tank in at least two water tanks and the set water temperature. When the current water temperature difference between the current water temperature of each water tank in at least two water tanks and the set water temperature corresponding to the water tank is less than the preset water temperature difference, it is determined that all water tanks in at least two water tanks meet the standby condition.

[0144] In the several embodiments provided in the embodiments of the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or modules, which can be electrical, mechanical or other forms.

[0145] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0146] In addition, each functional module in each embodiment of the present application can be integrated into a processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules.

[0147] If the integrated module is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0148] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the embodiments of the present application are not limited by the described order of actions, because according to the embodiments of the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the embodiments of the present application.

[0149] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0150] The above is a description of an air-energy water heater and a control method for an air-energy water heater provided in an embodiment of the present application. For technicians in this field, according to the ideas of the embodiments of the present application, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the embodiments of the present application.

Claims

1. An air energy water heater, characterized in that: The air energy water heater comprises: At least two water tanks; A refrigerant pipeline, wherein the air-to-water heater is provided with a flow control valve, and the flow control valve is used to adjust the refrigerant circulation flow of the refrigerant pipeline; An outdoor unit, wherein the outdoor unit is provided with at least one set of outdoor unit refrigerant interface groups, and each of the water tanks is connected in parallel with the outdoor unit through the refrigerant pipeline and the outdoor unit refrigerant interface group; Wherein, the air energy water heater is used for: Acquire the current water temperature and the set water temperature of each water tank in the at least two water tanks, and determine the current water temperature difference of each water tank based on the current water temperature and the set water temperature; Obtaining a preset water temperature difference, taking a current water temperature difference greater than or equal to the preset water temperature difference as a target water temperature difference, and taking a water tank corresponding to the target water temperature difference as a target water tank among the at least two water tanks that meets the heating condition; Obtaining a target current water temperature and a target set water temperature corresponding to the target water tank, and determining a refrigerant circulation flow parameter for the target water tank based on the target current water temperature and the target set water temperature; The opening of the flow control valve corresponding to the target water tank is controlled based on the refrigerant circulation flow parameter to supply heat to the target water tank.

2. The air energy water heater according to claim 1, characterized in that: The external machine refrigerant interface group includes a pair of external machine refrigerant inlet and external machine refrigerant outlet, the refrigerant pipeline includes a first refrigerant pipeline and a second refrigerant pipeline, the water tank includes a heat exchanger inlet and a heat exchanger outlet, and the heat exchanger inlet is equipped with the flow control valve; Among them, the outdoor unit refrigerant outlet is connected in parallel with the heat exchanger inlet of each water tank via the first refrigerant pipeline, and each water tank is connected in parallel with the outdoor unit refrigerant inlet of the outdoor unit via the second refrigerant pipeline through the heat exchanger outlet.

3. The air energy water heater according to claim 2, characterized in that: The number of the external machine refrigerant interface groups is the same as the number of the water tanks; or, The number of the external unit refrigerant interface group and the number of the water tank are different. The first refrigerant pipeline is configured with at least one first bifurcated pipe, and the first bifurcated pipe is used to connect the heat exchanger inlets of at least two water tanks; The second refrigerant pipeline is configured with at least one second bifurcated pipe, and the second bifurcated pipe is used to connect the heat exchanger outlets of at least two water tanks.

4. The air energy water heater according to claim 1, characterized in that: The number of the external machine refrigerant interface group is the same as that of the water tank, the external machine refrigerant interface group includes a pair of external machine refrigerant inlets and external machine refrigerant outlets, the refrigerant pipeline includes a first refrigerant pipeline and a second refrigerant pipeline, the water tank includes a heat exchanger inlet and a heat exchanger outlet, and the external machine refrigerant outlet is configured with the flow control valve; The external unit refrigerant outlet is connected in parallel with the heat exchanger inlet of each water tank via the first refrigerant pipeline, and each water tank is connected in parallel with the external unit refrigerant inlet of the outdoor unit via the second refrigerant pipeline through the heat exchanger outlet.

5. A control method for an air energy water heater, characterized in that: The air-energy water heater comprises: at least two water tanks; a refrigerant pipeline, the air-energy water heater is equipped with a flow control valve, the flow control valve is used to adjust the refrigerant circulation flow of the refrigerant pipeline; an outdoor unit, the outdoor unit is provided with at least one set of outdoor unit refrigerant interface groups, each of the water tanks is connected in parallel with the outdoor unit through the refrigerant pipeline and the outdoor unit refrigerant interface group, and the control method comprises: Acquire the current water temperature and the set water temperature of each water tank in the at least two water tanks, and determine the current water temperature difference of each water tank based on the current water temperature and the set water temperature; Obtaining a preset water temperature difference, taking a current water temperature difference greater than or equal to the preset water temperature difference as a target water temperature difference, and taking a water tank corresponding to the target water temperature difference as a target water tank among the at least two water tanks that meets the heating condition; Obtaining a target current water temperature and a target set water temperature corresponding to the target water tank, and determining a refrigerant circulation flow parameter for the target water tank based on the target current water temperature and the target set water temperature; The opening of the flow control valve corresponding to the target water tank is controlled based on the refrigerant circulation flow parameter to supply heat to the target water tank.

6. The method according to claim 5, characterized in that Determining a refrigerant circulation flow parameter for the target water tank based on the target current water temperature and the target set water temperature includes: Determine a target water temperature difference corresponding to each target water tank based on the target current water temperature and the target set water temperature, and determine a reference water temperature difference with a maximum value from the target water temperature differences; Obtaining an upper limit parameter of the opening of the flow control valve, and determining a temperature difference ratio between the target water temperature difference and the reference water temperature difference; A refrigerant circulation flow parameter for the target water tank is determined based on the opening upper limit parameter and the temperature difference ratio.

7. The method according to claim 6, characterized in that The determining of the refrigerant circulation flow parameter for the target water tank based on the opening upper limit parameter and the temperature difference ratio includes: A reference refrigerant circulation flow parameter is obtained based on multiplying the opening upper limit parameter by the temperature difference ratio; Acquire a preset initial opening parameter of the flow control valve, and when the reference refrigerant circulation flow parameter is greater than the initial opening parameter, use the reference refrigerant circulation flow parameter as the refrigerant circulation flow parameter of the target water tank; When the reference refrigerant circulation flow parameter is less than or equal to the initial opening parameter, the initial opening parameter is used as the refrigerant circulation flow parameter of the target water tank.

8. The method according to claim 5, characterized in that The method further comprises: Obtain the preset initial opening parameters of the flow control valve to determine whether all the water tanks among the at least two water tanks meet the standby conditions; when all the water tanks among the at least two water tanks meet the standby conditions, control the opening of the flow control valve corresponding to each water tank based on the initial opening parameters.

9. The method according to claim 8, characterized in that The determining whether all water tanks in the at least two water tanks meet the standby condition includes: Obtain a preset water temperature difference, obtain the current water temperature and the set water temperature of each of the at least two water tanks, and when the current water temperature difference between the current water temperature of each of the at least two water tanks and the set water temperature corresponding to the water tank is less than the preset water temperature difference, determine that all of the at least two water tanks meet the standby conditions.

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