Control method of gas water heating device

Abstract

The invention discloses a control method of a gas water heating device, the gas water heating device comprises a combustion device, a first heat exchanger and a second heat exchanger which are arranged in sequence, flue gas generated by the combustion device flows through the first heat exchanger and the second heat exchanger in sequence, and at least part of water flow entering the gas water heating device flows through the second heat exchanger and the first heat exchanger in sequence; the gas water heating device further comprises an atomization cavity and an atomization generator, the atomization cavity communicates with the heat exchange cavity of the second heat exchanger so that condensate water generated in the second heat exchanger can flow into the atomization cavity, and the atomization generator is used for atomizing the condensate water flowing into the atomization cavity so that the condensate water can form water mist. The control method comprises the steps that the heat load needed by the gas water heating device for heating water entering the gas water heating device to the preset temperature is obtained; and controlling the working power of the atomization generator based on the thermal load. The problem that water mist formed by the condensate water atomization device is prone to secondary condensation at the position of the smoke exhaust pipe, and consequently water drips from the smoke exhaust pipe can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot water equipment, in particular to a control method of a gas hot water device. BACKGROUND

[0002] In the field of gas water heaters, in order to improve energy conversion efficiency, the prior art usually sets a condensing heat exchanger downstream of the main heat exchanger. When water flows through the condensing heat exchanger and exchanges heat with flue gas, water vapor in the flue gas condenses when it is cooled, forming condensate on the surface of the condensing heat exchanger. In this process, the latent heat released by the water vapor significantly improves the thermal efficiency of the water heater. To avoid the need for an external drain pipe to drain the condensate, which would affect the appearance and ease of installation, the prior art provides a condensate atomization device inside the gas water heater. The condensate is atomized and then discharged with the flue gas. This method simplifies the structure of the water heater and improves its safety.

[0003] However, when the condensate atomization device discharges the condensate, if it is turned on at rated power or higher, the water mist formed by the condensate is too much, and the humidity in the discharged flue gas is too high, which can cause secondary condensation at the exhaust pipe. Due to the low temperature of the external environment of the exhaust pipe, the water mist condenses again into liquid water, causing the exhaust pipe to drip water. This not only affects the user experience, but also can cause the surrounding wall of the exhaust pipe to be damaged by moisture, so there is room for improvement. SUMMARY

[0004] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present application is to provide a control method of a gas hot water device, which can solve the problem of secondary condensation of water mist formed by a condensate atomization device at an exhaust pipe, causing the exhaust pipe to drip water.

[0005] The specific technical scheme of the embodiments of the present application is:

[0006] A control method of a gas hot water device, the gas hot water device comprising a combustion device, a first heat exchanger, and a second heat exchanger arranged in sequence, flue gas generated by the combustion device flowing through the first heat exchanger and the second heat exchanger in sequence, and water flowing into the gas hot water device at least partially flowing through the second heat exchanger and the first heat exchanger in sequence;

[0007] The gas hot water device further comprises an atomization cavity and an atomization generator, the atomization cavity being in communication with a heat exchange cavity of the second heat exchanger to allow condensate generated in the second heat exchanger to flow into the atomization cavity, and the atomization generator being configured to atomize the condensate flowing into the atomization cavity to form a water mist;

[0008] The control method of the gas hot water device comprises:

[0009] S101: Obtain a heat load required for heating water entering the gas water heating device to a preset temperature by the gas water heating device;

[0010] S102: Control a working power of the atomization generator based on the heat load.

[0011] Preferably, in step S101, comprising:

[0012] Obtaining an inlet water temperature and an inlet water flow rate of water entering the gas water heating device;

[0013] Obtaining the heat load based on the inlet water temperature, the inlet water flow rate and the preset temperature.

[0014] Preferably, in step S101, comprising:

[0015] Obtaining an inlet water temperature, an inlet water flow rate of water entering the gas water heating device and an outlet water temperature of hot water output by the gas water heating device;

[0016] Obtaining the heat load based on the inlet water temperature, the inlet water flow rate and the outlet water temperature.

[0017] Preferably, in step S101, comprising:

[0018] Obtaining the heat load required for heating water entering the gas water heating device to a preset temperature by the gas water heating device according to an operating parameter of a combustion device; the operating parameter comprises: a number of fire rows of the combustion device opened for combustion and a fire degree of the fire rows opened.

[0019] Preferably, the atomization generator comprises at least two atomization generating units, and the atomization generating units are configured to be independently or jointly workable;

[0020] In step S102, comprising:

[0021] Determining an interval range to which the heat load belongs according to the heat load;

[0022] Determining a number of the atomization generating units opened in the atomization generator according to the interval range to which the heat load belongs, and opening a corresponding number of the atomization generating units in the atomization generator.

[0023] Preferably, the working power of the atomization generating unit is a fixed value.

[0024] Preferably, in step S102, comprising:

[0025] Controlling a first group of the atomization generating units in the atomization generator to be opened;

[0026] when a first preset condition is met subsequently, a second group of corresponding number of the atomization generating units in the atomization generator is controlled to be turned on; the first group of corresponding number of the atomization generating units and the second group of corresponding number of the atomization generating units are different at least in one aspect.

[0027] Preferably, the first preset condition comprises at least one of the following: the time for which a first group of corresponding number of the atomization generating units in the atomization generator is turned on reaches a preset time, the number of times for which a first group of corresponding number of the atomization generating units in the atomization generator is turned on reaches a preset number, a signal is received that the atomization generator needs to be turned on.

[0028] Preferably, the atomization generator comprises a power control module, and the power control module comprises a control circuit, and the control circuit comprises: independent switch units respectively connected to at least two atomization generating units, and the switch units can be independently turned on or turned off.

[0029] Preferably, the atomization generator comprises at least one atomization generating unit and a power control module, and the power control module comprises a voltage adjustment module, and the voltage adjustment module is used to adjust the voltage supplied to the atomization generating unit, so that the working power of the atomization generating unit can be changed.

[0030] Preferably, in S102, the following steps are included:

[0031] According to the heat load, the voltage adjustment module supplies voltage to the atomization generating unit.

[0032] Preferably, the control method of the gas water heating device further comprises:

[0033] S103: obtaining the liquid level of the condensate water in the atomization cavity, and determining whether to turn on the atomization generator according to the liquid level of the condensate water in the atomization cavity.

[0034] Preferably, in step S103, when the liquid level of the condensate water in the atomization cavity reaches or exceeds a first liquid level, the atomization generator is turned on.

[0035] When the liquid level of the condensate water in the atomization cavity is lower than the first liquid level, the atomization generator is turned off.

[0036] Preferably, the gas water heating device comprises: a first liquid level detection unit capable of detecting whether the condensate water in the atomization cavity reaches a first liquid level.

[0037] The first liquid level is within the optimal liquid level range of the atomization generator for atomizing water.

[0038] Preferably, the control method of the gas water heater further comprises:

[0039] S104: obtaining the liquid level of the condensed water in the inner cavity of the second heat exchanger, and determining whether to close the combustion device and / or alarm according to the liquid level of the condensed water in the inner cavity of the second heat exchanger.

[0040] Preferably, in step S104, when the liquid level of the condensed water in the inner cavity of the second heat exchanger reaches or exceeds a second liquid level, a first preset operation is performed; the first preset operation comprises closing the combustion device and / or alarming.

[0041] Preferably, the second liquid level is higher than the first liquid level, and the second liquid level is lower than the flue gas inlet of the inner cavity.

[0042] Preferably, the gas water heater further comprises a fan that guides at least part of the flue gas into the atomization cavity of the atomization device and then discharges from the flue gas discharge pipe.

[0043] The first preset operation further comprises starting the atomization generator to work, and simultaneously starting the fan.

[0044] Preferably, the control method of the gas water heater comprises:

[0045] S105: obtaining the liquid level of the condensed water in the atomization cavity when the combustion device is in a non-running state, and determining whether to start the atomization generator according to the liquid level of the condensed water in the atomization cavity.

[0046] Preferably, the gas water heater further comprises a fan that guides at least part of the flue gas into the atomization cavity of the atomization device and then discharges from the flue gas discharge pipe.

[0047] In step S105, when the liquid level of the condensed water in the atomization cavity reaches or exceeds a first liquid level, the atomization generator and the fan are started;

[0048] When the liquid level of the condensed water in the atomization cavity is lower than the first liquid level, the atomization generator and the fan are closed.

[0049] Preferably, in step S105, when the liquid level of the condensed water in the atomization cavity reaches or exceeds the first liquid level, the fan is started to work at a low speed.

[0050] Preferably, in step S105, when the liquid level of the condensed water in the atomization cavity reaches or exceeds the first liquid level, the atomization generator is started to continue to work at a power corresponding to the last time when the combustion device stops running.

[0051] Preferably, in step S102, when the heat load required for heating water in the gas water heater to the preset temperature is 4kW-15kW, the working power of the atomization generator is controlled to be between 10w and 30w; when the heat load required for heating water in the gas water heater to the preset temperature is 15kW-30kW, the working power of the atomization generator is controlled to be between 20w and 60w.

[0052] Preferably, the control method of the gas water heater further comprises:

[0053] S106: obtaining the inlet water temperature of water input to the heat exchange pipeline of the second heat exchanger;

[0054] Step S102 comprises: controlling the working power of the atomization generator based on the heat load and the inlet water temperature.

[0055] Preferably, the atomization generator comprises at least two atomization generating units, and the atomization generating units are configured to be independently or jointly operable;

[0056] In step S102, it comprises:

[0057] According to the heat load, the interval range to which the heat load belongs is determined;

[0058] According to the interval range to which the heat load belongs and the inlet water temperature, the number of the atomization generating units in the atomization generator that are turned on is determined, and the corresponding number of the atomization generating units in the atomization generator is turned on.

[0059] Preferably, in step S102, according to the interval range to which the heat load belongs and the inlet water temperature, the number of the atomization generating units in the atomization generator that are turned on is determined, and the corresponding number of the atomization generating units in the atomization generator is turned on, it comprises:

[0060] According to the inlet water temperature, the interval range to which the inlet water temperature belongs is determined;

[0061] According to the interval range to which the heat load belongs and the interval range to which the inlet water temperature belongs, the number of the atomization generating units in the atomization generator that are turned on is determined, and the corresponding number of the atomization generating units in the atomization generator is turned on.

[0062] Preferably, the atomization generator comprises at least one atomization generating unit and a power control module, the power control module comprises a voltage adjusting module, and the voltage adjusting module is used to adjust the voltage supplied to the atomization generating unit, so that the working power of the atomization generating unit can be changed;

[0063] In step S102, the voltage supplied to the atomization generating unit by the voltage regulating module is controlled according to the heat load and the inlet water temperature.

[0064] Preferably, the working power of the atomization generator is negatively correlated with the inlet water temperature.

[0065] Preferably, the working power of the atomization generator is positively correlated with the heat load.

[0066] Preferably, the heat load and the voltage of the atomization generating unit are positively correlated, and the inlet water temperature and the voltage of the atomization generating unit are negatively correlated.

[0067] Preferably, the gas water heater comprises a first temperature detection unit arranged near or upstream of the inlet of the heat exchange pipeline of the second heat exchanger.

[0068] Preferably, when the inlet water temperature is less than or equal to a first preset value, the working power of the atomization generator is controlled to be between 10w and 30w when the heat load required for heating the water in the gas water heater to the preset temperature is between 4kW and 15kW, and the working power of the atomization generator is controlled to be between 30w and 60w when the heat load required for heating the water in the gas water heater to the preset temperature is between 15kW and 30kW; the first preset value is between 14 degrees Celsius and 17 degrees Celsius.

[0069] When the inlet water temperature is greater than the first preset value, the working power of the atomization generator is controlled to be between 10w and 20w when the heat load required for heating the water in the gas water heater to the preset temperature is between 4kW and 15kW, and the working power of the atomization generator is controlled to be between 20w and 50w when the heat load required for heating the water in the gas water heater to the preset temperature is between 15kW and 30kW.

[0070] Preferably, the gas water heater comprises:

[0071] A fan is arranged between the first heat exchanger and the second heat exchanger, and when the fan is in operation, the flue gas generated by the combustion device flows through the first heat exchanger, the fan and the second heat exchanger in sequence.

[0072] Preferably, the gas water heater further comprises a flow guide pipeline for communicating the flue gas flowing out of the first heat exchanger with the atomization cavity, and the flue gas flowing out of the first heat exchanger flows into the atomization cavity through the flow guide pipeline.

[0073] Preferably, the inlet of the flow guide pipe is arranged downstream of the fan impeller to guide the flue gas flowing out of the impeller into the atomizing cavity.

[0074] Preferably, the inlet of the flow guide pipe is arranged downstream of the fan outlet or at the fan outlet.

[0075] The technical solution of the present application has the following remarkable beneficial effects:

[0076] The present application can adjust the working power of the atomizing generator according to the heat load of the combustion device, so that the working power of the atomizing generator is adapted to the heat load of the combustion device. The greater the heat load of the gas water heater, the more flue gas is generated, and the more condensate water is generated when the flue gas passes through the second heat exchanger. The atomizing generator needs to have a higher working power to change the condensate water into water mist and discharge it with the flue gas. At the same time, when there is more flue gas, the atomizing generator can also form more water mist, and the concentration of water mist in the flue gas will not be excessively increased, so that the phenomenon of secondary condensation of flue gas at the exhaust gas pipe when discharging will not occur, and the phenomenon of water dripping at the exhaust gas pipe will not occur.

[0077] Specific embodiments of the present application are disclosed in detail in the following description and accompanying drawings, indicating the ways in which the principles of the present application can be employed. It should be understood that the embodiments of the present application are not limited in scope to the specific embodiments described. Features described and / or illustrated with respect to one embodiment can be used in the same or similar manner in one or more other embodiments, in combination with or in place of features in other embodiments, or in place of other features in the same embodiment. BRIEF DESCRIPTION OF DRAWINGS

[0078] The drawings described herein are for purposes of illustration only and are not intended to limit the scope of the present disclosure in any way. Additionally, the shapes and relative sizes of the components in the drawings are meant to be illustrative and not limiting. Those skilled in the art will recognize that the components can be in different shapes and relative sizes, and that the shapes and relative sizes in the drawings are meant to be illustrative and not limiting.

[0079] Figure 1 A step flow chart of the control method of the gas water heater in an embodiment of the present application;

[0080] Figure 2 A step flow chart of the control method of the gas water heater in another embodiment of the present application;

[0081] Figure 3 A structural schematic diagram of the gas water heater in an embodiment of the present application;

[0082] Figure 4Fig. 2 is a sectional view of the second heat exchanger and the atomizing device in an embodiment of the present application;

[0083] Figure 5 Fig. 4 is a circuit diagram of the atomizing generator and the combustion device in an embodiment of the present application;

[0084] Figure 6 Fig. 5 is a circuit diagram of the power control module in an embodiment of the present application;

[0085] Figure 7 Fig. 6 is a structural diagram of the control circuit in the power control module in an embodiment of the present application.

[0086] Reference signs in the above drawings:

[0087] 1, combustion device; 101, controller; 2, first heat exchanger; 3, fan; 4, second heat exchanger; 41, inner cavity; 5, atomizing device; 51, atomizing cavity; 52, atomizing generator; 521, power control module; 5211, switch unit; 522, atomizing generating unit; 6, communication part; 7, first liquid level detecting unit; 8, second liquid level detecting unit; 9, flow guide pipeline; 10, leading pipeline; 11, exhaust pipe. DETAILED DESCRIPTION

[0088] The details of the application can be more clearly understood with reference to the drawings and the following description. However, the specific embodiments of the application described herein are intended for purposes of illustration only and are not intended to be limiting in any way. The application can be carried out in any of the ways set forth above, and using equivalent techniques and procedures. Those skilled in the art will readily recognize a variety of ways of implementing the application, and the application should be understood to include any such variations. The present application is not limited to the specific embodiments described, but only by the claims. When an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In addition, when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can also be present. The order of steps in the claims is not limited to the order in which the steps are recited in the description unless a specific order is mentioned. The terms "comprise", "comprising", "include", "including", "contain", "containing", "have" and "having" are used in the specification to mean that the described feature, integer, step, or component can be included or contained in the described implementation, but not to the exclusion of other features, integers, steps, or components. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms are used in the description for the purpose of explanation only and are not intended to be limiting in any way.

[0089] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0090] In order to solve the problem that the water mist formed by the condensate atomizing device is easy to cause secondary condensation at the exhaust pipe, resulting in water dripping from the exhaust pipe, a control method of a gas water heating device is provided in the application, wherein the control method can be applied to any one of the following gas water heating devices.

[0091] Figure 3 The structure of the gas water heating device in the embodiment of the application is shown in the figure, Figure 4 The cross-sectional view of the second heat exchanger and the atomizing device in the embodiment of the application is shown in the figure, Figure 3 And Figure 4 As shown in the figure, the gas water heating device comprises a combustion device 1, a first heat exchanger 2 and a second heat exchanger 4 arranged in sequence, the flue gas generated by the combustion device 1 flows through the first heat exchanger 2 and the second heat exchanger 4 in sequence, and the water flow entering the gas water heating device flows through the second heat exchanger 4 and the first heat exchanger 2 in sequence at least in part; the gas water heating device further comprises an atomizing cavity 51 and an atomizing generator 52, the atomizing cavity 51 is in communication with the heat exchange cavity of the second heat exchanger 4 so that the condensate water generated in the second heat exchanger 4 flows into the atomizing cavity 51, and the atomizing generator 52 is used for atomizing the condensate water flowing into the atomizing cavity 51 so that the condensate water forms water mist.

[0092] As shown in the figure, Figure 3As shown, the combustion device 1 is used to mix the input gas and air of the gas water heater and then to combust, so as to form high-temperature flue gas to provide heat energy. The first heat exchanger 2 is arranged downstream of the combustion device 1 along the flue gas flow direction, and the first heat exchanger 2 is used to exchange heat with the high-temperature flue gas output by the combustion device 1, so as to heat the water flowing through the heat exchange pipeline of the first heat exchanger 2. The high-temperature flue gas is converted into flue gas with relatively low temperature after exchanging heat with the first heat exchanger 2. The flue gas after exchanging heat with the first heat exchanger 2 is input into the second heat exchanger 4 to exchange heat, so as to heat the water flowing through the second heat exchanger 4. The heat exchange pipeline of the first heat exchanger 2 and the heat exchange pipeline of the second heat exchanger 4 are connected. The water flow entering the gas water heater flows through the second heat exchanger 4 and the first heat exchanger 2 in sequence at least, and the water to be heated in the gas water heater is preheated by the flue gas after exchanging heat with the first heat exchanger 2 through the heat exchange pipeline of the second heat exchanger 4, and then the preheated water flows into the heat exchange pipeline of the first heat exchanger 2 to be heated, so as to form hot water meeting the temperature requirement of the user, which is then output for use by the user.

[0093] As feasible, as shown in Figure 3 As shown, the gas water heater can include a fan 3. The fan 3 is used to drive the high-temperature flue gas generated by the combustion device 1 to flow through the first heat exchanger 2 and the second heat exchanger 4 in sequence. For example, along the flue gas flow direction, the fan 3 is arranged between the first heat exchanger 2 and the second heat exchanger 4, and when the fan 3 is in the working state, the flue gas generated by the combustion device 1 flows through the first heat exchanger 2, the fan 3, and the second heat exchanger 4 in sequence. The flue gas after exchanging heat with the first heat exchanger 2 is input into the second heat exchanger 4 under the action of the fan 3 to exchange heat, so as to heat the water flowing through the second heat exchanger 4.

[0094] As shown in Figure 4 As shown, the atomization device 5 has an atomization cavity 51 and an atomization generator 52. The atomization cavity 51 of the atomization device 5 is connected with the inner cavity 41 of the second heat exchanger 4, for example, through the communication part 6. Therefore, the condensed water flowing out of the inner cavity 41 of the second heat exchanger 4 flows into the atomization cavity 51 of the atomization device 5 through the communication part 6. The atomization generator 52 is used to atomize the condensed water flowing into the atomization cavity 51 to form water mist. The fan 3 introduces at least part of the flue gas into the atomization cavity 51 of the atomization device 5, and then discharges the flue gas from the exhaust pipe 11. The flue gas introduced into the atomization cavity 51 of the atomization device 5 can carry the water mist generated by the atomization generator 52 to be discharged from the exhaust pipe 11.

[0095] As feasible, as shown in Figure 4As shown, the communication part 6 can perform different functions on the condensed water flowing from the inner cavity 41 of the second heat exchanger 4 into the atomizing cavity 51 of the atomizing device 5. The communication part 6 can include a condensed water treatment module, and the condensed water generated in the second heat exchanger 4 flows through the condensed water treatment module and then flows into the atomizing cavity 51 of the atomizing device 5. For example, the condensed water treatment module can at least include one of the following functions: condensed water filtering function, condensed water discharging function, and the like.

[0096] As feasible, as shown in Figure 4 As shown, the gas water heating device can include a flow guide pipeline 9 for communicating the flue gas flowing out of the first heat exchanger 2 with the atomizing cavity 51 of the atomizing device 5, and the flue gas flowing out of the first heat exchanger 2 flows through the flow guide pipeline 9 and then flows into the atomizing cavity 51 of the atomizing device 5.

[0097] As shown in Figure 3 As shown, when the fan 3 is arranged between the first heat exchanger 2 and the second heat exchanger 4, the inlet of the flow guide pipeline 9 is arranged downstream of the impeller of the fan 3 to guide the flue gas flowing out of the impeller into the atomizing cavity 51 of the atomizing device 5. As feasible, the inlet of the flow guide pipeline 9 can be arranged downstream of the outlet of the fan 3 or at the outlet of the fan 3. The flow guide pipeline 9 at least partially penetrates the inner cavity 41 of the second heat exchanger 4.

[0098] In this way, the flue gas after at least partial heat exchange in the second heat exchanger 4 or the flue gas after heat exchange in the first heat exchanger 2 can be directly introduced into the atomizing cavity 51 of the atomizing device 5 through the flow guide pipeline 9, so that the flue gas entering the atomizing cavity 51 of the atomizing device 5 through the flow guide pipeline 9 does not exchange heat with the water to be heated flowing through the heat exchange pipeline of the second heat exchanger 4 or only exchanges a small amount of heat with the water to be heated flowing through the heat exchange pipeline of the second heat exchanger 4. Compared with the flue gas completely exchanged in the second heat exchanger 4, the flue gas entering the atomizing cavity 51 of the atomizing device 5 through the flow guide pipeline 9 can maintain a relatively high temperature, so that when the flue gas enters the atomizing cavity 51 of the atomizing device 5, the condensed water mist in the atomizing cavity 51 cannot be converted into liquid droplets again due to low temperature and cannot be carried out of the atomizing device 5 by the flue gas. Therefore, it is beneficial to carry the condensed water mist formed in the atomizing cavity 51 out of the atomizing device 5.

[0099] As feasible, as shown in Figure 4 As shown, the gas water heating device can include an outlet pipeline 10 and an exhaust pipe 11. The exhaust pipe 11 is used to exhaust the flue gas flowing through the second heat exchanger 4, and the flue gas is exhausted to the outside of the gas water heating device, such as the outside of the house. The outlet pipeline 10 communicates the atomizing cavity 51 of the atomizing device 5 with the exhaust pipe 11. Through this structure, the water mist of the condensed water in the atomizing cavity 51 can be carried by the flue gas and then discharged from the exhaust pipe 11 of the gas water heating device.

[0100] Figure 1 The flow chart of the steps of the control method of the gas water heater in an embodiment of the present application is shown in FIG. 1. The control method of the gas water heater in the present application can include the following steps: Figure 1

[0101] S101: Obtain the heat load required for heating the water entering the gas water heater to the preset temperature.

[0102] In this step, the preset temperature can be the temperature that the user sets for the gas water heater to heat the water to.

[0103] In order to obtain the heat load required for heating the water entering the gas water heater to the preset temperature, the heat load does not have to be an accurate value, but can also be a heat load value that is generally close to the actual heating of the water entering the gas water heater to the preset temperature, so there are many different ways to obtain the heat load.

[0104] In a first feasible embodiment, in step S101, the water inlet temperature and the water inlet flow rate of the water entering the gas water heater are obtained. The heat load is obtained based on the water inlet temperature, the water inlet flow rate, and the preset temperature. The heat load can be calculated by the difference between the preset temperature and the water inlet temperature, multiplied by the water inlet flow rate and the specific heat capacity of water.

[0105] As feasible, the gas water heater comprises a first temperature detection unit arranged near the inlet of the heat exchange pipeline of the second heat exchanger 4 or upstream of the inlet of the heat exchange pipeline of the second heat exchanger 4. The temperature of the water entering the inlet of the heat exchange pipeline of the second heat exchanger 4 can be obtained by the first temperature detection unit, which can be used as the water inlet temperature of the water entering the gas water heater.

[0106] As feasible, the gas water heater comprises a flow rate detection unit for detecting the water flow rate flowing through the heat exchange pipeline of the first heat exchanger 2 or the heat exchange pipeline of the second heat exchanger 4, which can be used as the water inlet flow rate of the water entering the gas water heater.

[0107] In a second feasible embodiment, in step S101, the water inlet temperature, the water inlet flow rate of the water entering the gas water heater, and the water outlet temperature of the hot water output by the gas water heater are obtained. The heat load is obtained based on the water inlet temperature, the water inlet flow rate, and the water outlet temperature. The heat load can be calculated by the difference between the water outlet temperature and the water inlet temperature, multiplied by the water inlet flow rate and the specific heat capacity of water.

[0108] ​As feasible, the gas water heating device comprises a second temperature detection unit arranged near or downstream of the outlet of the heat exchange pipeline of the first heat exchanger 2. The temperature of the water at the outlet of the heat exchange pipeline of the first heat exchanger 2 can be obtained by the second temperature detection unit, which can be used as the outlet water temperature of the hot water output by the gas water heating device.

[0109] In a third feasible embodiment, in step S101, it comprises: obtaining the heat load required for the gas water heating device to heat the water entering the gas water heating device to a preset temperature according to the operating parameters of the combustion device 1. The operating parameters can include the number of fire rows of the combustion device 1 opened for combustion and the fire power degree of the fire row opened. The fire power degree of the fire row opened can be obtained by the proportional valve of the combustion device 1, such as the current of the proportional valve.

[0110] S102: Control the working power of the atomization generator 52 based on the heat load.

[0111] In this step, the working power of the atomization generator 52 can be adjusted according to the heat load of the combustion device 1, so that the working power of the atomization generator 52 is adapted to the heat load of the combustion device 1. The atomization power of the atomization generator 52 is positively correlated with the heat load. The greater the heat load of the gas water heating device, the more flue gas is generated, and the more condensate water is generated when the flue gas passes through the second heat exchanger 4. The atomization generator 52 needs to have a higher working power to change the condensate water into water mist and discharge with the flue gas. At the same time, when there is more flue gas, the atomization generator 52 can also form more water mist, and the concentration of the water mist in the flue gas will not be excessively increased, so that the flue gas will not cause secondary condensation at the exhaust gas pipe 11 when it is discharged, and water droplets will not appear at the end of the exhaust gas pipe 11. In addition, since the greater the heat load of the gas water heating device, the higher the temperature of the flue gas generated, the flue gas mixed with water mist is not easy to cause secondary condensation at the exhaust gas pipe 11 when it is discharged, so the working power of the atomization generator 52 can be relatively increased.

[0112] The working power of the atomization generator 52 cannot be too small, otherwise it cannot timely change the condensate water generated in the second heat exchanger 4 into water mist and discharge with the flue gas from the gas water heating device. The working power of the atomization generator 52 cannot be too large, otherwise it will generate too much water mist, and the flue gas with too much water mist will cause secondary condensation at the exhaust gas pipe 11 when it is discharged, and water droplets will appear at the end of the exhaust gas pipe 11.

[0113] Through the above steps, the energy consumption of the atomization generator 52 can be saved, the frequent start and stop of the atomization generator 52 can be avoided, and the power of the atomization generator 52 can be prevented from being too large to generate too much water mist, thereby avoiding the secondary condensation of flue gas with too much water mist at the exhaust pipe 11 when the flue gas is discharged, and preventing the phenomenon of water droplets at the end of the exhaust pipe 11.

[0114] Through the above steps, the user experience can be improved, and to some extent, the damage to the wall around the exhaust pipe 11 caused by moisture can be prevented.

[0115] In a feasible implementation, the atomization generator 52 can include at least two atomization generating units 522, which are configured to work independently or jointly. The number of atomization generating units 522 turned on can be adjusted according to the heat load of the gas water heater, so as to adjust the working power of the atomization generator 52.

[0116] Specifically, in step S102, the interval range to which the heat load belongs can be determined according to the heat load. The number of atomization generating units 522 turned on in the atomization generator 52 is determined according to the interval range to which the heat load belongs, and the corresponding number of atomization generating units 522 in the atomization generator 52 is turned on.

[0117] In this step, the working power of the atomization generating unit 522 can be a fixed value. Through the above method, the cost of the atomization generator 52 can be effectively reduced. Since the working power of the atomization generating unit 522 is a fixed value, different heat loads cannot correspond to different numbers of atomization generating units 522 turned on. For example, when the interval range to which the heat load belongs is the first interval range, one atomization generating unit 522 in the atomization generator 52 is turned on; when the interval range to which the heat load belongs is the second interval range, two atomization generating units 522 in the atomization generator 52 are turned on, and the minimum value of the second interval range is slightly larger than the maximum value of the first interval range; when the interval range to which the heat load belongs is the third interval range, three atomization generating units 522 in the atomization generator 52 are turned on, and the minimum value of the third interval range is slightly larger than the maximum value of the second interval range.

[0118] As feasible, in step, the corresponding number of atomization generating units 522 in the atomization generator 52 can be opened, which can include: controlling the first group of corresponding number of atomization generating units 522 in the atomization generator 52 to open. When the first preset condition is met subsequently, the second group of corresponding number of atomization generating units 522 in the atomization generator 52 is controlled to open, and the first group of corresponding number of atomization generating units 522 and the second group of corresponding number of atomization generating units 522 are different at least one. Through the above-mentioned manner, the rotation or alternation of the atomization generating unit 522 can be realized, and the same atomization generating unit 522 is avoided to be opened all the time, especially the gas water heater runs with small heat load most of the time, and the corresponding atomization generating unit 522 is generally opened.

[0119] In the above-mentioned step, the first preset condition can include at least one of the following: the time of the first group of corresponding number of atomization generating units 522 in the atomization generator 52 opening reaches the preset time, the number of the first group of corresponding number of atomization generating units 522 in the atomization generator 52 opening reaches the preset number, and the signal that the atomization generator 52 needs to be opened is received. When the first preset condition is that the signal that the atomization generator 52 needs to be opened is received, it can effectively avoid that the user closes the atomization generating unit 522 which has been opened in the process of using the gas water heater, and then opens another closed atomization generating unit 522, which can effectively prolong the service life of the atomization generator 52.

[0120] Correspondingly, Figure 5 The circuit schematic diagram of the atomization generator and the combustion device in the embodiment of the present application is shown as follows, Figure 5 The atomization generator 52 can include a power control module 521, and the power control module 521 is electrically connected with the controller 101 of the combustion device 1. The controller 101 of the combustion device 1 can obtain the heat load required for the gas water heater to heat the water entering the gas water heater to the preset temperature, and the power control module 521 can obtain the working power of the atomization generator 52 from the controller 101 of the combustion device 1. The controller 101 can be understood as a controller for controlling the combustion device 1, or can be understood as a controller of the entire gas water heater, that is, a main control circuit board. The power control module 521 is configured to adjust the working power of the atomization generator 52 according to the heat load of the gas water heater, so that the power of the atomization generator 52 is adapted to the heat load of the combustion device 1, and the power of the atomization generator 52 is avoided to be too large to generate too much water mist.

[0121] As feasible, the controller 101 stores a first corresponding relationship between the interval range to which the heat load belongs and the number of the atomization generating units 522 in the atomization generator 52 that are turned on, and the controller 101 can determine the number of the atomization generating units 522 in the atomization generator 52 that are turned on according to the interval range to which the heat load belongs and the first corresponding relationship.

[0122] In the above steps, Figure 6 The circuit schematic diagram of the power control module in an embodiment of the present application is shown in FIG. 5. Figure 6 As shown in FIG. 5, the power control module 521 can include a control circuit, and the control circuit is electrically connected to the at least two atomization generating units 522. Figure 7 The structure schematic diagram of the control circuit in the power control module in an embodiment of the present application is shown in FIG. 6. Figure 7 As shown in FIG. 6, the control circuit is provided with an independent switch unit 5211 on the circuit connected to the at least two atomization generating units 522, and the switch unit 5211 can be independently turned on or turned off. By controlling the turning on or turning off of the switch unit 5211, the number of the atomization generating units 522 that are turned on can be adjusted.

[0123] In another feasible embodiment, the atomization generator 52 can include at least one atomization generating unit 522, and the working power of the atomization generating unit 522 can be changed. Specifically, the power control module 521 can include a voltage adjusting module, and the voltage adjusting module is used to adjust the voltage supplied to the atomization generating unit 522, so that the working power of the atomization generating unit 522 can be changed.

[0124] In this embodiment, in S102, the voltage supplied by the voltage adjusting module to the atomization generating unit 522 can be controlled according to the heat load.

[0125] In order to avoid that the excessive power of the atomization generator 52 causes too much water mist, and in order to avoid that the flue gas with too much water mist causes secondary condensation at the exhaust pipe 11 when being discharged, and in order to avoid that the end of the exhaust pipe 11 appears water dripping, as feasible, the ratio of the working power (unit: W) of the atomization generator 52 to the heat load (unit: W) required for heating water in the gas water heater to a preset temperature needs to be controlled to be less than or equal to 0.0075. Considering that the working power of the atomization generator 52 cooperates with the condensed water generated by the second heat exchanger 4, and in order to ensure that the condensed water generated by the second heat exchanger 4 can be discharged in time, as feasible, the ratio of the working power (unit: W) of the atomization generator 52 to the heat load (unit: W) required for heating water in the gas water heater to a preset temperature needs to be controlled to be greater than or equal to 0.0067.

[0126] For example, in one specific embodiment, when the heat load required for heating water in the gas water heater to a preset temperature is 4kW-15kW, the working power of the atomization generator 52 can be controlled at about 10w-30w; when the heat load required for heating water in the gas water heater to a preset temperature is 15kW-30kW, the working power of the atomization generator 52 can be controlled at about 20w-60w.

[0127] As a possibility, the control method of the gas water heater can include:

[0128] S103: Obtain the liquid level of the condensed water in the atomization cavity 51, and determine whether to start the atomization generator 52 according to the liquid level of the condensed water in the atomization cavity 51. Through this step, it can be avoided that the running atomization generator 52 is damaged due to dry burning caused by the too low liquid level of the condensed water in the atomization cavity 51.

[0129] In this step, specifically, when the liquid level of the condensed water in the atomization cavity 51 reaches or exceeds a first liquid level, the atomization generator 52 is started; when the liquid level of the condensed water in the atomization cavity 51 is lower than the first liquid level, the atomization generator 52 is stopped.

[0130] Correspondingly, as shown in Figure 4 The gas water heater can include a first liquid level detection unit 7 capable of detecting whether the condensed water in the atomization cavity 51 reaches a first liquid level, and the first liquid level is within the optimal liquid level range of the atomization generator 52 for atomizing water. The optimal liquid level range of the atomization generator 52 for atomizing water is that the atomization generator 52 has a higher efficiency for atomizing water when the water in the atomization cavity 51 is within the liquid level range. The atomization generator 52 and the first liquid level detection unit 7 are electrically connected with the controller 101. The controller 101 can obtain whether the condensed water in the containing cavity reaches the first liquid level. Through the above-mentioned manner, the power control module 521 of the atomization generator 52 can control the start and stop of the atomization generator 52 according to whether the condensed water in the atomization cavity 51 reaches the first liquid level.

[0131] As a possibility, the control method of the gas water heater can include:

[0132] S104: Obtain the liquid level of the condensed water in the inner cavity 41 of the second heat exchanger 4, and determine whether to stop the combustion device 1 and / or alarm according to the liquid level of the condensed water in the inner cavity 41 of the second heat exchanger 4.

[0133] In this step, specifically, when the liquid level of the condensed water in the inner cavity 41 of the second heat exchanger 4 reaches or exceeds a second liquid level, a first preset operation is performed; the first preset operation includes stopping the combustion device 1 and / or alarming.

[0134] Correspondingly, as shown in Figure 4 The gas water heating device can further comprise a second liquid level detection unit 8 configured to detect whether the condensed water in the inner cavity 41 of the second heat exchanger 4 reaches a second liquid level, the second liquid level being higher than the first liquid level and lower than the flue gas inlet of the inner cavity 41. Through the second liquid level detection unit 8, the gas water heating device can obtain whether the condensed water in the inner cavity 41 of the second heat exchanger 4 reaches the second liquid level, thereby preventing the condensed water in the inner cavity 41 of the second heat exchanger 4 from flowing back upward into the flue gas inlet of the inner cavity 41 due to the condensed water level being too high. Especially when the fan 3 is arranged between the first heat exchanger 2 and the second heat exchanger 4, once the condensed water in the inner cavity 41 of the second heat exchanger 4 flows back upward, it will enter the fan 3, thereby causing damage to the fan 3 and causing an accident. Through the above-mentioned manner, the condensed water level in the inner cavity 41 of the second heat exchanger 4 can be prevented from continuing to rise, and the user can be notified in the form of an alarm, and the user can operate the communication part 6, for example, to drain the condensed water.

[0135] Further, the first preset operation can further comprise: starting the atomization generator 52 to be in operation, and simultaneously, starting the fan 3. Further, the atomization generator 52 can be started to be in high-power operation, so that the condensed water in the atomization cavity 51 can be converted into water mist and discharged from the gas water heating device as soon as possible, thereby causing the condensed water level in the inner cavity 41 of the second heat exchanger 4 to drop rapidly.

[0136] As a possibility, the control method of the gas water heating device can comprise:

[0137] S105: When the combustion device 1 is in an unoperating state, obtaining the condensed water level in the atomization cavity 51, and determining whether to start the atomization generator 52 according to the condensed water level in the atomization cavity 51.

[0138] In the step, when the combustion device 1 is in an unoperating state, the condensed water in the atomization cavity 51 can be discharged as much as possible by the atomization generator 52, thereby reducing the condensed water level in the atomization cavity 51, so as to better prepare for the next operation of the combustion device 1 to accommodate more formed condensed water, avoid the condensed water level in the inner cavity 41 of the second heat exchanger 4 rising due to the condensed water in the atomization cavity 51 being unable to be atomized and discharged at a suitable working power later, or the flue gas with too much water mist being condensed again at the exhaust pipe 11 when being discharged, thereby causing the phenomenon of water dripping at the end of the exhaust pipe 11.

[0139] In the steps, specifically: when the liquid level of the condensed water in the atomizing cavity 51 reaches or exceeds the first liquid level, the atomizing generator 52 and the fan 3 are turned on; when the liquid level of the condensed water in the atomizing cavity 51 is lower than the first liquid level, the atomizing generator 52 and the fan 3 are turned off.

[0140] Furthermore, when the liquid level of the condensed water in the atomizing chamber 51 reaches or exceeds the first liquid level, it is feasible to turn on the fan 3 to operate at a low speed, thereby avoiding the gas water heater from making loud noise and affecting the user experience.

[0141] Furthermore, when the liquid level of the condensed water in the atomizing chamber 51 reaches or exceeds the first liquid level, it is feasible to turn on the atomizing generator 52 so that it continues to operate at a power corresponding to the last time the combustion device 1 stopped operating; it is also feasible to control the atomizing generator 52 to be in a low-power operating state, thereby avoiding the water mist formed by the atomizing generator 52 from undergoing secondary condensation at the exhaust pipe 11 and causing dripping at the end of the exhaust pipe 11.

[0142] As feasible, Figure 2 FIG. 1 is a flow chart of steps of a control method for a gas water heater according to another embodiment of the present invention. Figure 2 As shown, the control method of the gas water heater may include: S106: obtaining the inlet water temperature of the water input to the heat exchange pipeline of the second heat exchanger 4. Correspondingly, step S102 may include: controlling the working power of the atomizing generator 52 based on the heat load and the inlet water temperature.

[0143] In this embodiment, when the atomization generator 52 includes at least two atomization generating units 522, and the atomization generating units 522 are configured to work independently or together, in step S102, it can include: determining the interval range to which the heat load belongs based on the heat load; determining the number of the atomization generating units 522 in the atomization generator 52 to be turned on based on the interval range to which the heat load belongs and the inlet water temperature, and turning on the corresponding number of the atomization generating units 522 in the atomization generator 52.

[0144] Further, the number of the atomization generating units 522 in the atomization generator 52 to be turned on is determined according to the interval range of the heat load and the water inlet temperature, and the corresponding number of the atomization generating units 522 in the atomization generator 52 is turned on. Specifically, the interval range of the water inlet temperature is determined according to the water inlet temperature; and the number of the atomization generating units 522 in the atomization generator 52 to be turned on is determined according to the interval range of the heat load and the interval range of the water inlet temperature, and the corresponding number of the atomization generating units 522 in the atomization generator 52 is turned on. For example, the smaller the interval range of the water inlet temperature determined according to the water inlet temperature, the more the number of the atomization generating units 522 to be turned on; and the larger the interval range of the water inlet temperature determined according to the water inlet temperature, the less the number of the atomization generating units 522 to be turned on.

[0145] As a possibility, the controller 101 stores a second correspondence relationship between the interval range of the heat load, the water inlet temperature and the number of the atomization generating units 522 in the atomization generator 52 to be turned on, and the controller 101 can determine the number of the atomization generating units 522 in the atomization generator 52 to be turned on according to the interval range of the heat load, the water inlet temperature and the second correspondence relationship.

[0146] In this step, the atomization power of the atomization generator 52 is negatively correlated with the water inlet temperature. The lower the temperature of the water input into the heat exchange pipeline of the second heat exchanger 4, the more serious the cooling of the flue gas when flowing through the second heat exchanger 4, and the more condensate water generated. At this time, the atomization generator 52 needs to work at a higher power to change the condensate water into water mist and discharge it with the flue gas.

[0147] In this step, the first temperature detection unit can be electrically connected with the controller 101. The controller 101 can obtain the temperature of the water input into the heat exchange pipeline of the second heat exchanger 4. Therefore, the power control module 521 can be configured to adjust the working power of the atomization generator 52 according to the heat load of the gas water heating device and the temperature of the water input into the heat exchange pipeline of the second heat exchanger 4 obtained by the temperature detection device.

[0148] In this embodiment, when the atomization generator 52 comprises at least one atomization generating unit 522 and a power control module 521, the power control module 521 comprises a voltage adjustment module for adjusting the voltage supplied to the atomization generating unit 522, so that the working power of the atomization generating unit 522 can be changed, and correspondingly, in step S102, the voltage supplied by the voltage adjustment module to the atomization generating unit 522 can be controlled according to the heat load and the inlet water temperature. Specifically, the heat load and the voltage of the atomization generating unit 522 are positively correlated, and the inlet water temperature and the voltage of the atomization generating unit 522 are negatively correlated.

[0149] As feasible, when the inlet water temperature is less than or equal to a first preset value, in order to avoid excessive power of the atomization generator 52 causing too much water mist, and further avoiding the phenomenon of secondary condensation of flue gas with too much water mist at the exhaust gas duct 11 when being discharged, and causing water droplets at the end of the exhaust gas duct 11, the working power of the atomization generator 52 needs to be controlled in coordination with the condensate water generated by the second heat exchanger, so as to ensure that the condensate water generated by the second heat exchanger can be discharged in time. The ratio of the working power (unit: W) of the atomization generator 52 to the heat load (unit: kW) required for heating water in the gas water heater to a preset temperature needs to be controlled to be less than or equal to 0.0075 and greater than or equal to 0.00067. For example, the first preset value can be controlled at about 15 degrees Celsius, for example, between 13 degrees Celsius and 17 degrees Celsius. When the inlet water temperature is greater than the first preset value, at this time, since the inlet water temperature rises, the condensate water generated by the second heat exchanger decreases relatively, and therefore, the ratio of the working power (unit: W) of the atomization generator 52 to the heat load (unit: W) required for heating water in the gas water heater to a preset temperature needs to be controlled to be less than or equal to 0.005 and greater than or equal to 0.00067.

[0150] For example, in a specific embodiment, when the inlet water temperature is less than or equal to 15 degrees Celsius, when the heat load required for heating water in the gas water heater to a preset temperature is between 4 kW and 15 kW, the working power of the atomization generator 52 can be controlled to be about 10 W to 30 W, and when the heat load required for heating water in the gas water heater to a preset temperature is between 15 kW and 30 kW, the working power of the atomization generator 52 can be controlled to be about 30 W to 60 W. When the inlet water temperature is greater than 15 degrees Celsius, when the heat load required for heating water in the gas water heater to a preset temperature is between 4 kW and 15 kW, the working power of the atomization generator 52 can be controlled to be about 10 W to 20 W, and when the heat load required for heating water in the gas water heater to a preset temperature is between 15 kW and 30 kW, the working power of the atomization generator 52 can be controlled to be about 20 W to 50 W.

[0151] All articles and references, including patent applications and publications, disclosed herein are hereby incorporated by reference for all purposes. The term "consisting essentially of to describe a combination shall include the elements, ingredients, components or steps identified, and such other elements, ingredients, components or steps that do not materially affect the basic and novel characteristics of the combination. The use of the term "comprising" or "including" to describe combinations of elements, ingredients, components or steps herein also is taken to mean that other elements, ingredients, components or steps are optional, and the use of the term "comprising" or "including" to describe combinations of elements, ingredients, components or steps herein also is taken to mean that other elements, ingredients, components or steps are optional, and that statements of

[0152] The embodiments disclosed in the specification are intended to be exemplary only, and the true scope of the application is not intended to be limited by the embodiments described herein. The scope of the following claims, therefore, should not be limited by the embodiments and description contained herein.

Claims

1. A method for controlling a gas water heater, characterized in that: The gas water heater comprises a combustion device, a first heat exchanger, and a second heat exchanger, which are arranged in sequence. Flue gas generated by the combustion device flows through the first heat exchanger and the second heat exchanger in sequence. At least part of the water flowing into the gas water heater flows through the second heat exchanger and the first heat exchanger in sequence. The gas water heater further includes an atomizing cavity and an atomizing generator, wherein the atomizing cavity is connected to the heat exchange cavity of the second heat exchanger so that condensed water generated in the second heat exchanger flows into the atomizing cavity, and the atomizing generator is used to atomize the condensed water flowing into the atomizing cavity so that the condensed water forms water mist; The control method of the gas water heater comprises: S101: Obtaining a heat load required by the gas water heater to heat water entering the gas water heater to a preset temperature; S102: Controlling the operating power of the atomization generator based on the heat load.

2. The control method of the gas water heater according to claim 1, characterized in that: In step S101, it includes: Obtaining the inlet temperature and flow rate of water entering the gas water heater; The heat load is obtained based on the inlet water temperature, the inlet water flow rate, and the preset temperature.

3. The control method of the gas water heater according to claim 1, characterized in that: In step S101, it includes: Obtaining the inlet temperature and flow rate of water entering the gas water heater and the outlet temperature of hot water output by the gas water heater; The heat load is obtained based on the inlet water temperature, the inlet water flow rate, and the outlet water temperature.

4. The control method of the gas water heater according to claim 1, characterized in that: In step S101, it includes: The heat load required by the gas water heater to heat the water entering the gas water heater to a preset temperature is obtained according to the operating parameters of the combustion device; the operating parameters include: the number of fire grate sections of the combustion device turned on and the degree of fire power of the turned-on fire grate.

5. The control method of the gas water heater according to claim 1, characterized in that: The atomization generator includes at least two atomization generating units, and the atomization generating units are configured to work independently or together; In step S102, it includes: determining the interval range to which the heat load belongs according to the heat load; The number of the atomization generating units in the atomization generator to be turned on is determined according to the interval range to which the heat load belongs, and the corresponding number of the atomization generating units in the atomization generator are turned on.

6. The control method of the gas water heater according to claim 5, characterized in that: The operating power of the atomization generating unit is a fixed value.

7. The control method of the gas water heater according to claim 5, characterized in that: The step of turning on a corresponding number of the atomization generating units in the atomization generator includes: Controlling a first group of a corresponding number of atomization generating units in the atomization generator to turn on; When the first preset condition is subsequently met, the second group of corresponding number of atomization generating units in the atomization generator is controlled to be turned on; the first group of corresponding number of atomization generating units and the second group of corresponding number of atomization generating units have at least one difference.

8. The control method of the gas water heater according to claim 7, characterized in that: The first preset condition includes at least one of the following: the time for which the atomization generating units of the first group corresponding to the number in the atomization generator are turned on reaches a preset time, the number of times the atomization generating units of the first group corresponding to the number in the atomization generator are turned on reaches a preset number, and a signal that the atomization generator needs to be turned on is received.

9. The control method of the gas water heater according to claim 5, characterized in that: The atomization generator includes a power control module, the power control module includes a control circuit, and the control circuit includes: independent switch units respectively connected to at least two of the atomization generation units, and the switch units can be independently turned on or off.

10. The control method of a gas water heater according to claim 1, characterized in that: The atomization generator includes at least one atomization generating unit and a power control module. The power control module includes a voltage regulating module. The voltage regulating module is used to regulate the voltage supplied to the atomization generating unit so that the working power of the atomization generating unit can be changed.

11. The control method of a gas water heater according to claim 10, characterized in that: In S102, it includes: The voltage supplied by the voltage regulating module to the atomization generating unit is controlled according to the heat load.

12. The control method of a gas water heater according to claim 1, characterized in that: The control method of the gas water heater further includes: S103: Acquire the liquid level of the condensed water in the atomization cavity, and determine whether to turn on the atomization generator according to the liquid level of the condensed water in the atomization cavity.

13. The control method of a gas water heater according to claim 12, characterized in that: In step S103, when the liquid level of the condensed water in the atomization chamber reaches or exceeds a first liquid level, the atomization generator is turned on; When the liquid level of the condensed water in the atomization cavity is lower than the first liquid level, the atomization generator is turned off.

14. The control method of a gas water heater according to claim 13, characterized in that: The gas water heater comprises: a first liquid level detection unit capable of detecting whether the condensed water in the atomizing cavity reaches a first liquid level; The first liquid level is within an optimal liquid level range for the atomization generator to atomize water.

15. The control method of a gas water heater according to claim 13, characterized in that: The control method of the gas water heater further includes: S104: Acquire the liquid level of condensed water in the inner cavity of the second heat exchanger, and determine whether to shut down the combustion device and / or issue an alarm based on the liquid level of condensed water in the inner cavity of the second heat exchanger.

16. The control method of a gas water heater according to claim 15, characterized in that: In step S104, when the liquid level of the condensed water in the inner cavity of the second heat exchanger reaches or exceeds the second liquid level, a first preset operation is performed; the first preset operation includes: shutting down the combustion device and / or sounding an alarm.

17. The control method of a gas water heater according to claim 16, characterized in that: The second liquid level is higher than the first liquid level, and the second liquid level is lower than the smoke inlet of the inner cavity.

18. The control method of a gas water heater according to claim 17, characterized in that: The gas water heater further comprises: a fan, which guides at least part of the smoke into the atomizing chamber of the atomizing device and then discharges the smoke from the exhaust pipe; The first preset operation also includes: turning on the atomization generator to put it into operation, and at the same time, turning on the fan.

19. The control method of a gas water heater according to claim 1, characterized in that: The control method of the gas water heater comprises: S105: When the combustion device is in a non-operating state, obtaining the liquid level of condensed water in the atomization cavity, and determining whether to start the atomization generator according to the liquid level of the condensed water in the atomization cavity.

20. The control method of a gas water heater according to claim 19, characterized in that: The gas water heater further comprises: a fan, which guides at least part of the smoke into the atomizing chamber of the atomizing device and then discharges the smoke from the exhaust pipe; In step S105, when the liquid level of the condensed water in the atomization chamber reaches or exceeds a first liquid level, the atomization generator and the fan are turned on; When the liquid level of the condensed water in the atomizing chamber is lower than a first liquid level, the atomizing generator and the fan are turned off.

21. The control method of a gas water heater according to claim 20, characterized in that: In step S105 , when the liquid level of the condensed water in the atomizing chamber reaches or exceeds a first liquid level, the fan is turned on to operate at a low speed.

22. The control method of the gas water heater according to claim 20, characterized in that: In step S105, when the liquid level of the condensed water in the atomizing chamber reaches or exceeds the first liquid level, the atomizing generator is turned on to continue operating at a power corresponding to the power when the combustion device was stopped last time.

23. The control method of a gas water heater according to claim 1, characterized in that: In step S102, when the heat load required to heat the water in the gas water heater to the preset temperature is between 4kW and 15kW, the working power of the atomizing generator is controlled between 10w and 30w; when the heat load required to heat the water in the gas water heater to the preset temperature is between 15kW and 30kW, the working power of the atomizing generator is controlled between 20w and 60w.

24. The control method of a gas water heater according to claim 1, characterized in that: The control method of the gas water heater further includes: S106: Obtaining the inlet temperature of water input into the heat exchange pipeline of the second heat exchanger; Step S102 includes: controlling the operating power of the atomization generator based on the heat load and the inlet water temperature.

25. The control method of a gas water heater according to claim 24, characterized in that: The atomization generator includes at least two atomization generating units, and the atomization generating units are configured to work independently or together; In step S102, it includes: determining the interval range to which the heat load belongs according to the heat load; The number of the atomization generating units to be turned on in the atomization generator is determined according to the interval range to which the heat load belongs and the inlet water temperature, and a corresponding number of the atomization generating units in the atomization generator are turned on.

26. The control method of a gas water heater according to claim 25, characterized in that: The step of determining the number of the atomization generating units to be turned on in the atomization generator according to the interval range to which the heat load belongs and the inlet water temperature, and turning on a corresponding number of the atomization generating units in the atomization generator, includes: determining the interval range to which the inlet water temperature belongs according to the inlet water temperature; The number of the atomization generating units to be turned on in the atomization generator is determined according to the interval range to which the heat load belongs and the interval range to which the inlet water temperature belongs, and the corresponding number of the atomization generating units in the atomization generator are turned on.

27. The control method of a gas water heater according to claim 24, characterized in that: The atomization generator includes at least one atomization generating unit and a power control module, wherein the power control module includes a voltage regulating module, and the voltage regulating module is used to regulate the voltage supplied to the atomization generating unit so that the operating power of the atomization generating unit can be changed; In step S102 , the voltage supplied to the atomization generating unit by the voltage regulating module is controlled according to the heat load and the inlet water temperature.

28. The control method of a gas water heater according to claim 24, characterized in that: The operating power of the atomizing generator is negatively correlated with the inlet water temperature.

29. The control method of a gas water heater according to claim 1, characterized in that: The operating power of the atomization generator is positively correlated with the heat load.

30. The control method of a gas water heater according to claim 27, characterized in that: The heat load is positively correlated with the voltage of the atomization generating unit, and the water inlet temperature is negatively correlated with the voltage of the atomization generating unit.

31. The control method of a gas water heater according to claim 24, characterized in that: The gas water heater includes a first temperature detection unit, which is arranged near the inlet of the heat exchange pipeline of the second heat exchanger or upstream of the inlet of the heat exchange pipeline of the second heat exchanger.

32. The control method of the gas water heater according to claim 24, characterized in that: In step S102, when the water inlet temperature is less than or equal to a first preset value, when the heat load required to heat the water in the gas water heater to the preset temperature is between 4kW and 15kW, the operating power of the atomizing generator is controlled to be between 10W and 30W; when the heat load required to heat the water in the gas water heater to the preset temperature is between 15kW and 30kW, the operating power of the atomizing generator is controlled to be between 30W and 60W; the first preset value is between 14 degrees Celsius and 17 degrees Celsius; When the water inlet temperature is greater than the first preset value, when the heat load required to heat the water in the gas water heater to the preset temperature is between 4kW and 15kW, the working power of the atomizing generator is controlled between 10w and 20w; when the heat load required to heat the water in the gas water heater to the preset temperature is between 15kW and 30kW, the working power of the atomizing generator is controlled between 20w and 50w.

33. The control method of a gas water heater according to claim 1, characterized in that: The gas water heater comprises: A fan is provided between the first heat exchanger and the second heat exchanger. When the fan is in operation, the flue gas generated by the combustion device flows through the first heat exchanger, the fan, and the second heat exchanger in sequence.

34. The control method of the gas water heater according to claim 33, characterized in that: The gas water heater further includes a guide pipe for connecting the flue gas flowing out of the first heat exchanger to the atomizing cavity, and the flue gas flowing out of the first heat exchanger flows into the atomizing cavity after passing through the guide pipe.

35. The control method of the gas water heater according to claim 34, characterized in that: The inlet of the guide pipe is arranged downstream of the fan impeller to guide the smoke flowing out of the impeller into the atomization cavity.

36. The control method of the gas water heater according to claim 35, characterized in that: The inlet of the guide pipe is arranged downstream of the fan outlet or at the fan outlet.

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