Gas water heating device

Abstract

This utility model discloses a gas-fired hot water device, relating to the field of hot water equipment technology, comprising: a combustion device; a first heat exchanger disposed downstream of the combustion device along the flue gas flow direction; a second heat exchanger disposed downstream of the first heat exchanger along the flue gas flow direction, the heat exchange pipes of the first and second heat exchangers being connected, and water flowing into the gas-fired hot water device at least partially flowing sequentially through the heat exchange pipes of the second and first heat exchangers; a fan for driving the flue gas generated by combustion in the combustion device to flow sequentially through the first and second heat exchangers; an atomizing device having a receiving cavity and an atomizing generator, with a connecting part between the receiving cavity and the inner cavity of the second heat exchanger, allowing condensate generated in the second heat exchanger to flow into the receiving cavity of the atomizing device through the connecting part, etc. This application can solve the problem that the water mist formed by the condensate atomizing device is prone to secondary condensation at the flue pipe, causing water dripping from the flue pipe.

Description

Technical Field

[0001] This utility model relates to the field of hot water equipment technology, and in particular to a gas-fired hot water device. Background Technology

[0002] In the field of gas water heaters, to improve energy conversion efficiency, existing technologies typically place a condensing heat exchanger downstream of the main heat exchanger. When water flows through the condensing heat exchanger and exchanges heat with the flue gas, water vapor in the flue gas cools and precipitates, forming condensate on the surface of the condensing heat exchanger. During this process, the water vapor releases latent heat, significantly improving the thermal efficiency of the water heater. To avoid the need for an external drain pipe to discharge condensate, which would affect aesthetics and ease of installation, existing technologies use a condensate atomizing device inside the gas water heater to atomize the condensate and discharge it along with the flue gas. This method simplifies the water heater structure and improves safety.

[0003] However, when the condensate atomizing device discharges condensate, if it is turned on at rated power or higher, a large amount of water mist is formed, resulting in excessive humidity in the exhaust gas. This can easily lead to secondary condensation at the exhaust pipe. Because the external ambient temperature of the exhaust pipe is low, the water mist condenses again into liquid water, causing dripping from the exhaust pipe. This not only affects the user experience but may also damage the surrounding walls due to moisture. Therefore, there is room for improvement. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a gas-fired water heating device that can solve the problem that the water mist formed by the condensate atomizing device is prone to secondary condensation at the flue pipe, resulting in water dripping from the flue pipe.

[0005] The specific technical solution of this utility model embodiment is as follows:

[0006] A gas-fired water heating device, the gas-fired water heating device comprising:

[0007] A combustion device for providing thermal energy;

[0008] The first heat exchanger is located downstream of the combustion device along the flue gas flow direction;

[0009] The second heat exchanger is located downstream of the first heat exchanger along the flue gas flow direction. The heat exchange pipes of the first heat exchanger and the heat exchange pipes of the second heat exchanger are connected. At least part of the water flowing into the gas-fired hot water device flows through the heat exchange pipes of the second heat exchanger and the heat exchange pipes of the first heat exchanger in sequence.

[0010] A fan is used to drive the flue gas generated by the combustion device to flow sequentially through the first heat exchanger and the second heat exchanger;

[0011] An atomizing device is provided, comprising a receiving cavity and an atomizing generator. The receiving cavity has a communication portion with the inner cavity of a second heat exchanger, through which condensate generated in the second heat exchanger flows into the receiving cavity of the atomizing device. The atomizing generator is used to atomize the condensate flowing into the receiving cavity to form a water mist. The atomizing generator includes a power control module, which is electrically connected to the controller of the combustion device.

[0012] Preferably, the power control module is configured to adjust the operating power of the atomizing generator according to the heat load of the gas-fired water heater.

[0013] Preferably, the gas-fired hot water device includes:

[0014] A temperature detection unit is used to detect the temperature of the water input to the heat exchange pipeline of the second heat exchanger.

[0015] The temperature detection unit is electrically connected to the controller.

[0016] Preferably, the power control module is configured to adjust the operating power of the atomizing generator based on the heat load of the gas-fired water heater and the temperature of the water input to the heat exchange pipeline of the second heat exchanger obtained by the temperature detection device.

[0017] Preferably, the atomizer includes at least two atomizing units, and the at least two atomizing units are configured to work independently or together.

[0018] Preferably, the power control module is electrically connected to at least two of the atomizing units, and the power control unit can control at least two of the atomizing units to work independently or together.

[0019] Preferably, the power control module includes a control circuit, which is electrically connected to at least two of the atomizing units.

[0020] Preferably, each of the control circuits connected to at least two of the atomizing units is provided with an independent switching unit, which can be independently turned on or off.

[0021] Preferably, at least two of the atomizing units are configured to operate alternately.

[0022] Preferably, the atomizer includes at least one atomizing unit, the operating power of which can be varied.

[0023] Preferably, the power control module includes a voltage regulation module, which is used to regulate the voltage supplied to the atomizing unit so that the operating power of the atomizing unit can be varied.

[0024] Preferably, the gas-fired hot water device includes:

[0025] The first liquid level detection unit is capable of detecting whether the condensate in the containment cavity has reached the first liquid level, which is within the optimal liquid level range for the atomizing generator to atomize the water.

[0026] Both the atomizer and the first liquid level detection unit are electrically connected to the controller.

[0027] Preferably, the atomizing device has a first state and a second state. In the first state, the condensate in the containment cavity detected by the first liquid level detection unit reaches or exceeds the first liquid level, and the atomizing generator is in operation.

[0028] In the second state, the condensate in the containment cavity detected by the first liquid level detection unit is lower than the first liquid level, and the atomizer is in the off state.

[0029] Preferably, the gas-fired water heater has a first operating mode. In the first operating mode, when the condensate in the containment cavity detected by the first liquid level detection unit reaches or exceeds the first liquid level, the combustion device is in a stopped heating state, the fan is in an operating state, and the atomizing generator is in an operating state.

[0030] Preferably, in the first operating mode, the fan operates at a low speed, and the power control module controls the atomizing generator to operate at a low power.

[0031] Preferably, the gas-fired hot water device includes:

[0032] The second liquid level detection unit is capable of detecting whether the condensate in the inner cavity of the second heat exchanger has reached a second liquid level, which is higher than the first liquid level and lower than the flue gas inlet of the inner cavity.

[0033] Preferably, the gas-fired water heater controls its combustion start / stop and / or alarm based on whether the condensate in the inner cavity of the second heat exchanger has reached the second liquid level, as detected by the second liquid level detection unit.

[0034] Preferably, the temperature detection unit is located near the inlet of the second heat exchange pipeline or upstream of the inlet of the second heat exchange pipeline.

[0035] Preferably, along the flue gas flow direction, the fan is disposed 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 sequentially through the first heat exchanger, the fan, and the second heat exchanger.

[0036] Preferably, the connecting part includes a condensate treatment module, and the condensate generated in the second heat exchanger flows through the condensate treatment module and then into the receiving cavity of the atomizing device.

[0037] Preferably, the condensate treatment module includes at least one of the following functions: condensate filtration function and condensate discharge function.

[0038] Preferably, the gas-fired hot water device further includes: a guide pipe for connecting the flue gas flowing out of the first heat exchanger with the receiving cavity of the atomizing device, wherein the flue gas flowing out of the first heat exchanger flows into the receiving cavity of the atomizing device after passing through the guide pipe.

[0039] Preferably, along the flue gas flow direction, the fan is disposed between the first heat exchanger and the second heat exchanger, and the inlet of the guide pipe is disposed downstream of the fan impeller to guide the flue gas flowing out of the impeller into the receiving cavity of the atomizing device.

[0040] Preferably, the inlet of the guide pipe is located downstream of the fan outlet or at the fan outlet.

[0041] Preferably, the flow guide pipe passes at least partially through the inner cavity of the second heat exchanger.

[0042] Preferably, the gas-fired water heater further includes: an outlet pipe and a flue pipe, wherein the outlet pipe connects the receiving cavity of the atomizing device to the flue pipe.

[0043] Preferably, the outlet pipe passes at least partially through the inner cavity of the second heat exchanger.

[0044] The technical solution of this utility model has the following significant beneficial effects:

[0045] When the controller of the combustion device controls the heat load of the combustion device according to the heat load required to heat the water entering the gas water heater to the user-set temperature, the flue gas generated by the combustion device flows sequentially through the first heat exchanger and the second heat exchanger. When the flue gas flows through the second heat exchanger, condensation may occur. The condensation generated in the second heat exchanger flows into the receiving cavity of the atomizing device through the connecting part. The atomizing generator atomizes the condensation flowing into the receiving cavity to form water mist. During this process, the power control module of the atomizing generator can adjust the power of the atomizing generator according to the heat load of the combustion device, thereby adapting the power of the atomizing generator to the heat load of the combustion device. This saves energy consumption of the atomizing generator, avoids frequent start-stop of the atomizing generator, and prevents excessive power from the atomizing generator, which would lead to excessive water mist production. This also prevents secondary condensation of flue gas with excessive water mist at the exhaust pipe, which could cause dripping water. Through this method, the user experience can be improved, and damage to the walls around the exhaust pipe due to moisture can be prevented. Attached Figure Description

[0046] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0047] Figure 1 This is a schematic diagram of the gas-fired water heater in an embodiment of the present invention;

[0048] Figure 2 This is a cross-sectional schematic diagram of the second heat exchanger and atomizing device in an embodiment of this utility model;

[0049] Figure 3 This is a circuit diagram of the atomizer and combustion device in an embodiment of the present invention;

[0050] Figure 4 This is a circuit diagram of the power control module in one embodiment of the present invention;

[0051] Figure 5 This is a schematic diagram of the control circuit in the power control module of this utility model embodiment.

[0052] The reference numerals in the above figures are as follows:

[0053] 1. Combustion device; 101. Controller; 2. First heat exchanger; 3. Fan; 4. Second heat exchanger; 41. Inner cavity; 5. Atomizing device; 51. Receiving cavity; 52. Atomizing generator; 521. Power control module; 5211. Switching unit; 522. Atomizing generating unit; 6. Connecting part; 7. First liquid level detection unit; 8. Second liquid level detection unit; 9. Guide pipe; 10. Outlet pipe; 11. Smoke exhaust pipe. Detailed Implementation

[0054] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are for illustrative purposes only and should not be construed as limiting the utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model.

[0055] To address the problem of secondary condensation of water mist generated by the condensate atomizing device at the flue pipe, leading to dripping water from the flue pipe, this application proposes a gas-fired hot water device. Figure 1 This is a schematic diagram of the gas-fired water heater in an embodiment of the present invention. Figure 2 This is a cross-sectional schematic diagram of the second heat exchanger and atomizing device in an embodiment of this utility model. Figure 3 This is a circuit diagram of the atomizing generator and combustion device in an embodiment of the present invention, as shown below. Figures 1 to 3 As shown, the gas-fired water heater includes: a combustion device 1 for providing heat energy; a first heat exchanger 2, located downstream of the combustion device 1 along the flue gas flow direction; a second heat exchanger 4, located downstream of the first heat exchanger 2 along the flue gas flow direction, with the heat exchange pipes of the first heat exchanger 2 and the second heat exchanger 4 connected, and water flowing into the gas-fired water heater passing at least partially through the heat exchange pipes of the second heat exchanger 4 and the first heat exchanger 2 in sequence; and a fan 3 for driving the combustion device 1 to generate heat. The flue gas flows sequentially through the first heat exchanger 2 and the second heat exchanger 4; the atomizing device 5 has a receiving cavity 51 and an atomizing generator 52. The receiving cavity 51 and the inner cavity 41 of the second heat exchanger 4 have a connecting part 6. The condensate generated in the second heat exchanger 4 can flow into the receiving cavity 51 of the atomizing device 5 through the connecting part 6. The atomizing generator 52 is used to atomize the condensate flowing into the receiving cavity 51 to form water mist. The atomizing generator 52 includes a power control module 521, which is electrically connected to the controller 101 of the combustion device 1.

[0056] When the controller 101 of the combustion device 1 controls the heat load of the combustion device 1 according to the heat load required to heat the water entering the gas water heater to the user-set temperature, the flue gas generated by the combustion of the combustion device 1 flows through the first heat exchanger 2 and the second heat exchanger 4 in sequence. When the flue gas flows through the second heat exchanger 4, condensate may be generated. The condensate generated in the second heat exchanger 4 flows into the receiving cavity 51 of the atomizing device 5 through the connecting part 6. The atomizing generator 52 atomizes the condensate flowing into the receiving cavity 51 to form water mist. During this process, the power control module 521 of the atomizer 52 can adjust the power of the atomizer 52 according to the heat load of the combustion device 1, so that the power of the atomizer 52 is adapted to the heat load of the combustion device 1. This can save energy consumption of the atomizer 52, avoid frequent start-up and shutdown of the atomizer 52, and also avoid excessive power of the atomizer 52 leading to excessive water mist. This prevents secondary condensation of flue gas with excessive water mist at the exhaust pipe 11, which would cause water dripping at the end of the exhaust pipe 11. Through the above methods, the user experience can be improved, and to a certain extent, damage to the walls around the exhaust pipe 11 due to moisture can also be prevented.

[0057] like Figure 1 As shown, combustion device 1 mixes the gas and air input into the gas-fired hot water device and then burns them to form high-temperature flue gas, which provides heat energy. A first heat exchanger 2 is located downstream of combustion device 1 along the flue gas flow direction. The first heat exchanger 2 exchanges heat with the high-temperature flue gas output from combustion device 1, thereby heating the water flowing through the heat exchanger pipe. After passing through the first heat exchanger 2, the high-temperature flue gas is transformed into relatively low-temperature flue gas. A fan 3 drives the high-temperature flue gas generated by combustion device 1 to flow sequentially through the first heat exchanger 2 and the second heat exchanger 4. For example, along the flue gas flow direction, fan 3 is located between the first heat exchanger 2 and the second heat exchanger 4. When fan 3 is in operation, the flue gas generated by combustion device 1 flows sequentially through the first heat exchanger 2, fan 3, and second heat exchanger 4. After heat exchange in the first heat exchanger 2, the flue gas, under the action of fan 3, is input into the second heat exchanger 4 for further heat exchange, thereby heating the water passing through the second heat exchanger 4. The heat exchange pipes of the first heat exchanger 2 and the second heat exchanger 4 are connected. The water to be heated, which is input into the gas-fired water heater, first passes through the heat exchange pipes of the second heat exchanger 4 and is preheated by the flue gas after heat exchange in the first heat exchanger 2. The preheated water then flows back into the heat exchange pipes of the first heat exchanger 2 for further heating, thereby forming hot water that meets the user's temperature requirements, and then is output for the user's use.

[0058] like Figure 2As shown, the atomizing device 5 has a receiving cavity 51 and an atomizing generator 52. The receiving cavity 51 of the atomizing device 5 is connected to the inner cavity 41 of the second heat exchanger 4, for example, through a connecting part 6. Therefore, the condensate flowing out of the inner cavity 41 of the second heat exchanger 4 flows into the receiving cavity 51 of the atomizing device 5 through the connecting part 6. The atomizing generator 52 is used to atomize the condensate flowing into the receiving cavity 51 to form a water mist. The atomizing generator 52 includes a power control module 521, which is electrically connected to the controller 101 of the combustion device 1. The controller 101 can be understood as a controller that controls the combustion device 1, or as the controller of the entire gas water heater, i.e., the main control circuit board.

[0059] The power control module 521 is configured to adjust the operating power of the atomizer 52 according to the heat load of the gas water heater, thereby adapting the power of the atomizer 52 to the heat load of the combustion device 1. This prevents excessive power from the atomizer 52, which would otherwise produce too much water mist. Consequently, it avoids secondary condensation of flue gas containing excessive water mist at the exhaust pipe 11, preventing water dripping from the end of the exhaust pipe 11. This improves the user experience and, to some extent, prevents damage to the walls surrounding the exhaust pipe 11 due to moisture.

[0060] As a feasible option, such as Figure 2 As shown, the connecting part 6 can perform different functions on the condensate flowing from the inner cavity 41 of the second heat exchanger 4 into the receiving cavity 51 of the atomizing device 5. The connecting part 6 may include a condensate treatment module, through which the condensate generated in the second heat exchanger 4 flows into the receiving cavity 51 of the atomizing device 5. For example, the condensate treatment module may include at least one of the following functions: condensate filtration function, condensate discharge function, etc.

[0061] As a feasible approach, the operating power of the atomizer 52 is positively correlated with the heat load of the gas-fired water heater. The greater the heat load of the gas-fired water heater, the more flue gas is generated, and the more condensate is produced when the flue gas passes through the second heat exchanger 4. Therefore, the atomizer 52 needs to operate at a higher power to turn the condensate into water mist and discharge it with the flue gas. Simultaneously, the more flue gas there is, the more water mist can be generated by the atomizer 52, preventing an excessive increase in the concentration of water mist in the flue gas. Therefore, secondary condensation at the exhaust pipe 11 during flue gas discharge will not occur, thus preventing water dripping from the exhaust pipe 11. Furthermore, since a higher heat load from the gas-fired water heater results in a higher temperature of the generated flue gas, secondary condensation of the water mist-mixed flue gas at the exhaust pipe 11 during discharge is less likely to occur. Therefore, the operating power of the atomizer 52 can be relatively increased.

[0062] In one feasible implementation, Figure 4This is a circuit diagram of the power control module in one embodiment of the present invention, as shown below. Figure 4 As shown, the atomizing generator 52 may include at least two atomizing units 522, which are configured to operate independently or together. The power control module 521 can adjust the number of atomizing units 522 that are turned on according to the heat load of the gas water heater, thereby adjusting the operating power of the atomizing generator 52. Figure 5 This is a schematic diagram of the control circuit in the power control module of this utility model embodiment, as shown below. Figure 5 As shown, the power control module 521 may include a control circuit, which is electrically connected to at least two atomizing units 522. Each circuit connected to the control circuit and the at least two atomizing units 522 is equipped with an independent switching unit 5211, which can be independently turned on or off. By controlling the opening or closing of the switching unit 5211, the number of atomizing units 522 that are turned on can be adjusted. This method effectively reduces the cost of the atomizer 52.

[0063] In another feasible embodiment, the atomizer 52 includes at least one atomizing unit 522, the operating power of which can be varied. Specifically, the power control module 521 may include a voltage regulation module for regulating the voltage supplied to the atomizing unit 522, thereby allowing the operating power of the atomizing unit 522 to be changed.

[0064] To avoid excessive water mist generation due to excessive power of the atomizer 52, and consequently to prevent secondary condensation of flue gas containing excessive water mist at the exhaust pipe 11, causing dripping at the end of the exhaust pipe 11, it is feasible to control the ratio of the operating power (in W) of the atomizer 52 to the heat load (in W) required to heat the water in the gas-fired water heater to the preset temperature to be less than or equal to 0.0075. Considering that the operating power of the atomizer 52 should be coordinated with the condensate produced by the second heat exchanger 4 to ensure timely discharge of the condensate, it is feasible to control the operating power (in W) of the atomizer 52 to the heat load (in W) required to heat the water in the gas-fired water heater to the preset temperature to be greater than or equal to 0.0067.

[0065] For example, in one specific implementation, when the heat load required to heat the water in the gas-fired water heater to the preset temperature is 4kW-15kW, the operating power of the atomizer 52 can be controlled to be around 10W to 30W; when the heat load required to heat the water in the gas-fired water heater to the preset temperature is 15kW-30kW, the operating power of the atomizer 52 can be controlled to be around 20W to 60W.

[0066] When the atomizer 52 may include at least two atomizing units 522, the at least two atomizing units 522 are configured to work alternately, which can effectively extend the service life of the atomizer 52.

[0067] Alternatively, the gas-fired water heater may include a temperature detection unit for detecting the temperature of the water input to the heat exchange pipe of the second heat exchanger 4. For example, the temperature detection unit may be located near the inlet of the second heat exchange pipe or upstream of the inlet of the second heat exchange pipe. The temperature detection unit may be electrically connected to the controller 101. The controller 101 can obtain the temperature of the water input to the heat exchange pipe of the second heat exchanger 4. Therefore, the power control module 521 may be configured to adjust the operating power of the atomizing generator 52 according to the heat load of the gas-fired water heater and the temperature of the water input to the heat exchange pipe of the second heat exchanger 4 obtained by the temperature detection unit.

[0068] As a feasible approach, the operating power of the atomizer 52 is negatively correlated with the temperature of the water input to the heat exchanger pipe of the second heat exchanger 4. When the temperature of the water input to the heat exchanger pipe of the second heat exchanger 4 is lower, the flue gas encounters more cooling as it flows through the second heat exchanger 4, resulting in more condensate. In this case, the atomizer 52 needs to operate at a higher power to turn the condensate into water mist and discharge it with the flue gas.

[0069] As a feasible approach, when the inlet water temperature is less than or equal to the first preset value, to avoid excessive water mist generation due to excessive power of the atomizer 52, and thus to prevent secondary condensation of the flue gas with excessive water mist at the exhaust pipe 11, causing dripping at the end of the exhaust pipe 11, it is necessary to consider the working power of the atomizer in coordination with the condensate produced by the second heat exchanger, ensuring that the condensate produced by the second heat exchanger can be discharged in a timely manner. The ratio of the working power of the atomizer 52 (in W) to the heat load (in kW) required to heat the water in the gas-fired water heater to the 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 around 15 degrees Celsius, for example, between 13 and 17 degrees Celsius. When the inlet water temperature is greater than the first preset value, the amount of condensate produced by the second heat exchanger is relatively reduced due to the increase in inlet water temperature. Therefore, the ratio of the working power (in W) of the atomizing generator 52 to the heat load (in W) required to heat the water in the gas water heater to the preset temperature needs to be controlled to be less than or equal to 0.005 and greater than or equal to 0.00067.

[0070] For example, in one specific embodiment, when the inlet water temperature is less than or equal to 15 degrees Celsius, and the heat load required to heat the water in the gas-fired water heater to the preset temperature is 4kW-15kW, the operating power of the atomizing generator 52 can be controlled to approximately 10W-30W; when the heat load required to heat the water in the gas-fired water heater to the preset temperature is 15kW-30kW, the operating power of the atomizing generator 52 can be controlled to approximately 30W-60W. When the inlet water temperature is greater than 15 degrees Celsius, when the heat load required to heat the water in the gas-fired water heater to the preset temperature is 4kW-15kW, the operating power of the atomizing generator 52 can be controlled to approximately 10W-20W; when the heat load required to heat the water in the gas-fired water heater to the preset temperature is 15kW-30kW, the operating power of the atomizing generator 52 can be controlled to approximately 20W-50W.

[0071] As a feasible option, such as Figure 2 As shown, the gas-fired water heater may include: a first liquid level detection unit 7, which can detect whether the condensate in the receiving cavity 51 has reached a first liquid level, which is within the optimal liquid level range for the atomizer 52 to atomize the water. The optimal liquid level range for the atomizer 52 to atomize the water is when the water in the receiving cavity 51 is within this range, at which point the atomizer 52 has a high efficiency in atomizing the water. Both the atomizer 52 and the first liquid level detection unit 7 are electrically connected to the controller 101. The controller 101 can determine whether the condensate in the receiving cavity 51 has reached the first liquid level. In this way, the power control module 521 of the atomizer 52 can control the start and stop of the atomizer 52 according to whether the condensate in the receiving cavity 51 has reached the first liquid level.

[0072] Specifically, the atomizing device 5 can have a first state and a second state. In the first state, the condensate in the receiving cavity 51 detected by the first liquid level detection unit 7 reaches or exceeds the first liquid level, and the atomizing generator 52 is in operation. In the second state, the condensate in the receiving cavity 51 detected by the first liquid level detection unit 7 is below the first liquid level, and the atomizing generator 52 is in the off state.

[0073] As a feasible option, the gas-fired water heater can have a first operating mode. In the first operating mode, when the condensate in the containment chamber 51 detected by the first liquid level detection unit 7 reaches or exceeds the first liquid level, the combustion device 1 is in a stopped heating state, the fan 3 is in an operating state, and the atomizing generator 52 is in an operating state. When the combustion device 1 of the gas-fired water heater stops heating, if the condensate in the containment chamber 51 reaches or exceeds the first liquid level, the gas-fired water heater can be operated in the first operating mode to atomize and discharge the condensate in the containment chamber 51, thereby reducing the condensate level in the containment chamber 51. This prevents excessive condensate in the containment chamber 51 from causing the gas-fired water heater to shut down during subsequent operation.

[0074] Furthermore, in the first operating mode, the fan 3 can operate at a low speed to avoid excessive noise from the gas water heater affecting the user experience. In the first operating mode, the power control module 521 can control the atomizer 52 to operate at a low power, thus preventing secondary condensation of the water mist generated by the atomizer 52 at the exhaust pipe 11, which would cause dripping from the exhaust pipe 11. In another feasible implementation, in the first operating mode, the power control module 521 can control the atomizer 52 to continue operating at the power corresponding to the previous shutdown of the combustion device 1. Here, "shutdown" specifically refers to the moment when the combustion device 1 was about to stop, not the moment after it had already stopped.

[0075] As a feasible option, such as Figure 2 As shown, the gas-fired water heater may include a second liquid level detection unit 8, which can detect whether the condensate in the inner cavity 41 of the second heat exchanger 4 has reached a second liquid level, which is higher than the first liquid level and lower than the flue gas inlet of the inner cavity 41. The second liquid level detection unit 8 allows the gas-fired water heater to determine whether the condensate in the inner cavity 41 of the second heat exchanger 4 has reached the second liquid level, thereby preventing the condensate level in the inner cavity 41 from being too high and flowing back into the flue gas inlet of the inner cavity 41. Especially when the fan 3 is located between the first heat exchanger 2 and the second heat exchanger 4, if the condensate in the inner cavity 41 of the second heat exchanger 4 flows back upwards, it will enter the fan 3, thereby damaging the fan 3 and causing an accident. Furthermore, the gas-fired water heater can control its combustion start / stop and / or alarm based on whether the condensate in the inner cavity 41 of the second heat exchanger 4 has reached the second liquid level as detected by the second liquid level detection unit 8. The above method can prevent the condensate level in the inner cavity 41 of the second heat exchanger 4 from continuing to rise, and can notify the user by means of an alarm. The user can operate the connecting part 6, such as draining the condensate.

[0076] As a feasible option, such as Figure 2As shown, the gas-fired water heater may include: a guide pipe 9 for connecting the flue gas flowing out of the first heat exchanger 2 with the receiving cavity 51 of the atomizing device 5, wherein the flue gas flowing out of the first heat exchanger 2 flows into the receiving cavity 51 of the atomizing device 5 after passing through the guide pipe 9.

[0077] like Figure 1 As shown, when the fan 3 is positioned between the first heat exchanger 2 and the second heat exchanger 4, the inlet of the guide pipe 9 is located downstream of the impeller of the fan 3 to guide the flue gas exiting the impeller into the receiving cavity 51 of the atomizing device 5. Alternatively, the inlet of the guide pipe 9 can be located downstream of the outlet of the fan 3 or at the outlet of the fan 3. The guide pipe 9 at least partially passes through the inner cavity 41 of the second heat exchanger 4.

[0078] In this way, the flue gas that has undergone at least partial heat exchange in the second heat exchanger 4 or the flue gas output after heat exchange in the first heat exchanger 2 can be directly guided to the receiving cavity 51 of the atomizing device 5 through the guide pipe 9. In this way, the flue gas entering the receiving cavity 51 of the atomizing device 5 through the guide pipe 9 will not exchange heat with the water to be heated flowing through the heat exchange pipe of the second heat exchanger 4, or will only exchange heat with a small amount of the water to be heated flowing through the heat exchange pipe of the second heat exchanger 4. Compared with the flue gas that has completely undergone heat exchange in the second heat exchanger 4, the flue gas entering the receiving cavity 51 of the atomizing device 5 through the guide pipe 9 can maintain a relatively high temperature. In this way, when the flue gas enters the receiving cavity 51 of the atomizing device 5, it can avoid the condensed water mist in the receiving cavity 51 from turning back into droplets due to low temperature and being unable to be carried out of the atomizing device 5 by the flue gas. This is beneficial for carrying away the condensed water mist formed in the receiving cavity 51 and expelling it from the atomizing device 5.

[0079] As a feasible option, such as Figure 2 As shown, the gas-fired water heater may include an outlet pipe 10 and a flue pipe 11. The flue pipe 11 is used to discharge the flue gas flowing through the second heat exchanger 4, venting the flue gas outside the gas-fired water heater, for example, outdoors. The outlet pipe 10 connects the receiving cavity 51 of the atomizing device 5 to the flue pipe 11. This structure allows the water mist formed by the condensate in the receiving cavity 51 to be carried by the flue gas through the outlet pipe 10 and discharged from the flue pipe 11 of the gas-fired water heater.

[0080] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0081] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A gas-fired hot water device, characterized in that, The gas-fired hot water device includes: A combustion device for providing thermal energy; The first heat exchanger is located downstream of the combustion device along the flue gas flow direction; The second heat exchanger is located downstream of the first heat exchanger along the flue gas flow direction. The heat exchange pipes of the first heat exchanger and the heat exchange pipes of the second heat exchanger are connected. At least part of the water flowing into the gas-fired hot water device flows through the heat exchange pipes of the second heat exchanger and the heat exchange pipes of the first heat exchanger in sequence. A fan is used to drive the flue gas generated by the combustion device to flow sequentially through the first heat exchanger and the second heat exchanger; An atomizing device is provided, comprising a receiving cavity and an atomizing generator. The receiving cavity has a communication portion with the inner cavity of a second heat exchanger, through which condensate generated in the second heat exchanger flows into the receiving cavity of the atomizing device. The atomizing generator is used to atomize the condensate flowing into the receiving cavity to form a water mist. The atomizing generator includes a power control module, which is electrically connected to the controller of the combustion device.

2. The gas-fired hot water device according to claim 1, characterized in that, The power control module is configured to adjust the operating power of the atomizer according to the heat load of the gas water heater.

3. The gas-fired hot water device according to claim 1, characterized in that, The gas-fired hot water device includes: A temperature detection unit is used to detect the temperature of the water input to the heat exchange pipeline of the second heat exchanger. The temperature detection unit is electrically connected to the controller.

4. The gas-fired hot water device according to claim 3, characterized in that, The power control module is configured to adjust the operating power of the atomizer based on the heat load of the gas-fired water heater and the temperature of the water input to the heat exchange pipeline of the second heat exchanger obtained by the temperature detection device.

5. The gas-fired hot water device according to claim 1, characterized in that, The atomizer includes at least two atomizing units, which are configured to operate independently or together.

6. The gas-fired hot water device according to claim 5, characterized in that, The power control module is electrically connected to at least two of the atomizing units, and the power control unit can control at least two of the atomizing units to work independently or together.

7. The gas-fired hot water device according to claim 6, characterized in that, The power control module includes a control circuit, which is electrically connected to at least two of the atomizing units.

8. The gas-fired hot water device according to claim 7, characterized in that, Each of the control circuits and the circuits connected to at least two of the atomizing units is equipped with an independent switching unit, which can be independently turned on or off.

9. The gas-fired hot water device according to claim 5, characterized in that, At least two of the atomizing units are configured to operate alternately.

10. The gas-fired hot water device according to claim 1, characterized in that, The atomizer includes at least one atomizing unit, the operating power of which can be varied.

11. The gas-fired hot water device according to claim 10, characterized in that, The power control module includes a voltage regulation module, which is used to regulate the voltage supplied to the atomizing unit so that the operating power of the atomizing unit can be varied.

12. The gas-fired hot water device according to claim 1, characterized in that, The gas-fired hot water device includes: The first liquid level detection unit is capable of detecting whether the condensate in the containment cavity has reached the first liquid level, which is within the optimal liquid level range for the atomizing generator to atomize the water. Both the atomizer and the first liquid level detection unit are electrically connected to the controller.

13. The gas-fired hot water device according to claim 12, characterized in that, The atomizing device has a first state and a second state. In the first state, the condensate in the containment cavity detected by the first liquid level detection unit reaches or exceeds the first liquid level, and the atomizing generator is in operation. In the second state, the condensate in the containment cavity detected by the first liquid level detection unit is lower than the first liquid level, and the atomizer is in the off state.

14. The gas-fired hot water device according to claim 12, characterized in that, The gas-fired water heater has a first operating mode. In the first operating mode, when the condensate in the containment cavity detected by the first liquid level detection unit reaches or exceeds the first liquid level, the combustion device is in a stopped heating state, the fan is in an operating state, and the atomizing generator is in an operating state.

15. The gas-fired hot water device according to claim 14, characterized in that, In the first operating mode, the fan operates at a low speed, and the power control module controls the atomizer to operate at a low power.

16. The gas-fired hot water device according to claim 12, characterized in that, The gas-fired hot water device includes: The second liquid level detection unit is capable of detecting whether the condensate in the inner cavity of the second heat exchanger has reached a second liquid level, which is higher than the first liquid level and lower than the flue gas inlet of the inner cavity.

17. The gas-fired hot water device according to claim 16, characterized in that, The gas-fired water heater controls its combustion start / stop and / or alarm based on whether the condensate in the inner cavity of the second heat exchanger has reached the second liquid level, as detected by the second liquid level detection unit.

18. The gas-fired hot water device according to claim 3, characterized in that, The temperature detection unit is located 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.

19. The gas-fired hot water device according to claim 1, characterized in that, Along the flue gas flow direction, the fan is disposed 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 sequentially through the first heat exchanger, the fan, and the second heat exchanger.

20. The gas-fired hot water device according to claim 1, characterized in that, The connecting part includes a condensate treatment module, and the condensate generated in the second heat exchanger flows through the condensate treatment module and then into the receiving cavity of the atomizing device.

21. The gas-fired hot water device according to claim 20, characterized in that, The condensate treatment module includes at least one of the following functions: condensate filtration function and condensate discharge function.

22. The gas-fired hot water device according to claim 1, characterized in that, The gas-fired water heater further includes a guide pipe for connecting the flue gas flowing out of the first heat exchanger with the receiving cavity of the atomizing device, wherein the flue gas flowing out of the first heat exchanger flows into the receiving cavity of the atomizing device after passing through the guide pipe.

23. The gas-fired hot water device according to claim 22, characterized in that, Along the flue gas flow direction, the fan is disposed between the first heat exchanger and the second heat exchanger, and the inlet of the guide pipe is disposed downstream of the fan impeller to guide the flue gas flowing out of the impeller into the receiving cavity of the atomizing device.

24. The gas-fired hot water device according to claim 23, characterized in that, The inlet of the flow guide pipe is located downstream of the fan outlet or at the fan outlet.

25. The gas-fired hot water device according to claim 22, characterized in that, The flow guide pipe passes through at least part of the inner cavity of the second heat exchanger.

26. The gas-fired hot water device according to claim 1, characterized in that, The gas-fired water heater further includes: an outlet pipe and a flue pipe, wherein the outlet pipe connects the receiving cavity of the atomizing device to the flue pipe.

27. The gas-fired hot water device according to claim 26, characterized in that, The outlet pipe passes through at least part of the inner cavity of the second heat exchanger.

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