Water heater and control method thereof

Abstract

The application discloses a water heater and a control method thereof, and relates to the technical field of water heaters. The water heater body comprises a main heat exchanger; the condensing heat exchanger has a water collecting cavity; the atomization module is arranged in the water collecting cavity; the water path switching assembly is arranged between the water inlet main pipe, the main heat exchanger and the condensing heat exchanger, and has a first working mode and a second working mode; in the first working mode, the water inlet main pipe, the condensing heat exchanger and the main heat exchanger are sequentially communicated to form a first flow path; in the second working mode, the water inlet main pipe and the main heat exchanger are communicated to form a second flow path, and the water inlet end and / or the water outlet end of the condensing heat exchanger are disconnected from the second flow path; the condensate water is atomized and discharged with flue gas, and the water inlet path is switched through the water path switching assembly, so that the problems that the condensate water generated in the process of efficiently recycling the waste heat of flue gas in the existing condensing gas water heater is inconvenient to discharge, the pipeline is prone to corrosion or frequent manual intervention is solved.

Description

Technical Field

[0001] This invention relates to the field of water heater technology, and in particular to a water heater and its control method. Background Technology

[0002] Against the backdrop of current energy conservation and emission reduction efforts, improving the thermal efficiency of condensing gas water heaters has become a mainstream trend in the industry. To further enhance energy efficiency, fully recovering the latent heat of vaporization in flue gas is one of the key technological pathways; however, this process inevitably produces condensate. Currently, condensing gas water heaters generally use two methods to handle condensate: one is to discharge the condensate directly into the sewer or water tank through a dedicated condensate pipe; the other is to collect it using a collection container and then manually empty it periodically.

[0003] However, both of the above methods have significant drawbacks. While the first method is simple to operate, it may cause the weakly acidic water in the condensate to corrode the drain pipes over a long period, posing a safety hazard. Furthermore, it is difficult to implement in some residences where there are no suitable drainage interfaces. The second method, although it can avoid direct corrosion of the pipes, requires frequent manual intervention, is inconvenient to use, and is prone to condensate overflow due to negligence, affecting the normal operation of equipment and the indoor environment. Summary of the Invention

[0004] The main objective of this invention is to propose a water heater and its control method, which aims to improve the convenience of condensate drainage and enhance the safety of the water heater.

[0005] To achieve the above objectives, the present invention provides a water heater comprising:

[0006] Main inlet pipe;

[0007] The water heater body, including the main heat exchanger;

[0008] A condensing heat exchanger having a water collection chamber for collecting the condensate produced by the condensing heat exchanger;

[0009] An atomizing module, located in the water collection chamber, is used to atomize the condensate in the water collection chamber;

[0010] A water path switching assembly is disposed between the main water inlet pipe, the main heat exchanger, and the condenser heat exchanger. The water path switching assembly has a first operating mode and a second operating mode. In the first operating mode, the water path switching assembly is used to sequentially connect the main water inlet pipe, the condenser heat exchanger, and the main heat exchanger to form a first flow path. In the second operating mode, the water path switching assembly is used to connect the main water inlet pipe and the main heat exchanger to form a second flow path, and disconnect the inlet end and / or outlet end of the condenser heat exchanger from the second flow path.

[0011] In one embodiment, the main inlet pipe is connected to the inlet of the condenser heat exchanger via a first pipe, and the outlet of the condenser heat exchanger is connected to the inlet of the main heat exchanger via a second pipe; the water circuit switching assembly includes a bypass pipe and a three-way valve, and the bypass pipe connects the second pipe and the first pipe;

[0012] The three-way valve is located at the junction of the bypass pipe and the second pipe; or, the three-way valve is located at the junction of the main inlet pipe, the first pipe and the bypass pipe.

[0013] In one embodiment, the main inlet pipe is connected to the inlet of the condenser heat exchanger via a first pipe, and the outlet of the condenser heat exchanger is connected to the inlet of the main heat exchanger via a second pipe; the water circuit switching assembly includes a bypass pipe, a first switching valve, and a second switching valve, the bypass pipe connecting the second pipe and the first pipe, and the first switching valve being disposed on the bypass pipe;

[0014] The second switching valve is located on the first pipeline between the bypass pipe and the inlet end of the condenser heat exchanger; or, the second switching valve is located on the second pipeline between the bypass pipe and the outlet end of the condenser heat exchanger.

[0015] In one embodiment, the water heater body has a flue, the main heat exchanger is disposed in the flue, the condensing heat exchanger includes a shell and a condensing heat exchange tube, the shell has the water collection cavity, and a flue inlet and a flue outlet communicating with the water collection cavity, the flue inlet communicating with the flue, and the condensing heat exchange tube is disposed inside the shell and located above the water collection cavity.

[0016] In one embodiment, the water heater body further includes a control device electrically connected to the water circuit switching component. The control device is used to control the water circuit switching component to operate in a first working mode when the liquid level in the water collection chamber reaches a first preset liquid level, and to control the water circuit switching component to operate in a second working mode when the liquid level in the water collection chamber reaches a second preset liquid level.

[0017] In one embodiment, the water heater body further includes a liquid level detection device, which is electrically connected to the control device. The liquid level detection device is used to detect the liquid level in the water collection chamber, and outputs a first detection signal to the control device when the liquid level in the water collection chamber reaches a first preset liquid level, and outputs a second detection signal to the control device when the liquid level in the water collection chamber reaches a second preset liquid level.

[0018] In one embodiment, the water heater body further includes a burner, a fan, a main outlet pipe, and a temperature detection device. The main outlet pipe is connected to the main heat exchanger, and the temperature detection device is electrically connected to the control device. The temperature detection device is used to detect the outlet water temperature of the main outlet pipe. The control device is also used to adjust the combustion load of the burner according to the detected outlet water temperature of the main outlet pipe, and control the fan speed to change accordingly with the change of the combustion load of the burner, so that the outlet water temperature of the main outlet pipe reaches the target outlet water temperature.

[0019] In one embodiment, the combustion load of the burner is positively correlated with the rotational speed of the fan.

[0020] In one embodiment, the control device is specifically configured to control the burner to operate at a first preset combustion load and control the fan to operate at a first preset speed when the temperature difference between the outlet water temperature of the main outlet pipe and the target outlet water temperature is within a first preset temperature difference range; and to control the burner to operate at a second preset combustion load and control the fan to operate at a second preset speed when the temperature difference between the outlet water temperature of the main outlet pipe and the target outlet water temperature is within a second preset temperature difference range; wherein the second preset combustion load is greater than the first preset combustion load and the second preset speed is greater than the first preset speed.

[0021] The present invention also proposes a control method for a water heater, wherein the water heater is as described above, and the control method for the water heater includes:

[0022] The water circuit switching component operates in the first working mode. In the first working mode, the water circuit switching component sequentially connects the inlet main pipe, the condenser heat exchanger and the main heat exchanger to form the first flow path.

[0023] Obtain the liquid level in the water collection chamber;

[0024] When the liquid level in the water collection chamber reaches the first preset liquid level, the atomization module is activated to atomize the condensate in the water collection chamber.

[0025] When the liquid level in the water collection chamber reaches the second preset liquid level, the control water path switching component operates in the second working mode. In the second working mode, the water path switching component connects the main water inlet pipe to the main heat exchanger to form a second flow path, and disconnects the water inlet and / or water outlet of the condenser heat exchanger from the second flow path.

[0026] In the operation of the water heater, the high-temperature flue gas flows through the condenser heat exchanger for heat exchange. Water vapor in the flue gas condenses into condensate upon contact with the condenser and collects in the water collection chamber at the bottom of the condenser heat exchanger. At this time, the water circuit switching component is in its first operating mode, sequentially connecting the inlet main pipe, the condenser heat exchanger, and the main heat exchanger to form a first flow path. Cold water is preheated by the condenser heat exchanger before being transported to the main heat exchanger for heating, which fully utilizes the latent heat of vaporization of the flue gas, saving energy and improving hot water output efficiency. Simultaneously, when the liquid level in the water collection chamber reaches a first preset level, the atomization module can be activated to atomize the condensate, which is then discharged along with the flue gas, achieving automatic and harmless treatment of the condensate. When the liquid level in the water collection chamber rises to the second preset liquid level, the water circuit switching component can be switched to the second working mode, connecting the main water inlet pipe to the main heat exchanger to form a second flow path, and disconnecting the inlet and / or outlet of the condenser heat exchanger from the second flow path. Cold water does not pass through the condenser heat exchanger and directly enters the main heat exchanger, so that the condenser heat exchanger no longer produces condensate. At the same time, the flue gas temperature at the outlet increases, which is conducive to the discharge of atomized water vapor. This causes the liquid level in the water collection chamber to drop, preventing condensate from flowing back into the combustion chamber of the water heater body due to excessive liquid level, thus ensuring the safety and stability of the water heater operation. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 A schematic diagram of an embodiment of the water circuit switching component in a water heater provided by the present invention operating in a first working mode;

[0029] Figure 2 for Figure 1 A schematic diagram of the water path switching component operating in the second working mode;

[0030] Figure 3 A schematic diagram of another embodiment of the water circuit switching component in the water heater provided by the present invention operating in the first working mode;

[0031] Figure 4 for Figure 3 A schematic diagram of the water path switching component operating in the second working mode;

[0032] Figure 5 A schematic diagram of another embodiment of the water circuit switching component in the water heater provided by the present invention operating in the first working mode;

[0033] Figure 6 for Figure 5 A schematic diagram of the water path switching component operating in the second working mode;

[0034] Figure 7 A schematic diagram of another embodiment of the water circuit switching component in the water heater provided by the present invention operating in the first working mode;

[0035] Figure 8 for Figure 7 A schematic diagram of the water path switching component operating in the second working mode;

[0036] Figure 9 A schematic diagram of the circuit functional modules of a water heater according to an embodiment of the present invention;

[0037] Figure 10 A flowchart of an embodiment of the water heater control method provided by the present invention.

[0038] Explanation of icon numbers:

[0039] 100. Water heater; 1. Main inlet pipe; 2. Water heater body; 21. Main heat exchanger; 22. Control device; 23. Liquid level detection device; 231. First liquid level detection element; 232. Second liquid level detection element; 24. Burner; 25. Fan; 26. Main outlet pipe; 27. Temperature detection device; 3. Condensing heat exchanger; 301. Water collection chamber; 302. Flue gas inlet; 303. Flue gas outlet; 31. Shell; 4. Atomizing module; 5. Water circuit switching assembly; 51. Bypass pipe; 52. Three-way valve; 53. First switching valve; 54. Second switching valve; 6. First pipeline; 7. Second pipeline.

[0040] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0042] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0043] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0044] Against the backdrop of current energy conservation and emission reduction efforts, improving the thermal efficiency of condensing gas water heaters has become a mainstream trend in the industry. To further enhance energy efficiency, fully recovering the latent heat of vaporization in flue gas is one of the key technological pathways; however, this process inevitably produces condensate. Currently, condensing gas water heaters generally use two methods to handle condensate: one is to discharge the condensate directly into the sewer or water tank through a dedicated condensate pipe; the other is to collect it using a collection container and then manually empty it periodically.

[0045] However, both of the above methods have significant drawbacks. While the first method is simple to operate, it may cause the weakly acidic water in the condensate to corrode the drain pipes over a long period, posing a safety hazard. Furthermore, it is difficult to implement in some residences where there are no suitable drainage interfaces. The second method, although it can avoid direct corrosion of the pipes, requires frequent manual intervention, is inconvenient to use, and is prone to condensate overflow due to negligence, affecting the normal operation of equipment and the indoor environment.

[0046] Therefore, the present invention proposes a water heater 100, which aims to improve the convenience of condensate drainage and enhance the safety of the water heater 100.

[0047] Please see Figure 1 and Figure 2In one embodiment of the present invention, the water heater 100 includes an inlet main pipe 1, a water heater body 2, a condenser heat exchanger 3, an atomizing module 4, and a water path switching assembly 5. The water heater body 2 includes a main heat exchanger 21; the condenser heat exchanger 3 has a water collection chamber 301 for collecting condensate generated by the condenser heat exchanger 3; the atomizing module 4 is disposed in the water collection chamber 301 for atomizing the condensate in the water collection chamber 301; the water path switching assembly 5 is disposed between the inlet main pipe 1, the main heat exchanger 21, and the condenser heat exchanger 3, and the water path switching assembly 5 has a first working mode and a second working mode. In the first working mode, the water path switching assembly 5 is used to sequentially connect the inlet main pipe 1, the condenser heat exchanger 3, and the main heat exchanger 21 to form a first flow path. In the second working mode, the water path switching assembly 5 is used to connect the inlet main pipe 1 and the main heat exchanger 21 to form a second flow path, and disconnect the inlet end and / or outlet end of the condenser heat exchanger 3 from the second flow path.

[0048] In this embodiment, the water heater 100 is a condensing gas water heater 100, which may include a water heater body 2 and a condensing heat exchanger 3. The water heater body 2 is the main component for combustion and heat exchange, and it has a flue for flue gas circulation. The flue gas inlet 302 of the condensing heat exchanger 3 is connected to the flue inside the water heater body 2. The flue gas generated by the water heater body 2 enters the shell 31 of the condensing heat exchanger 3 through the flue gas inlet 302 and exchanges heat with the condensing heat exchange tubes inside the shell 31. The condensing gas water heater 100 can be either a forced-draft type or a forced-blowing type. Taking the condensing gas water heater 100 as an example of a forced-draft type, the water heater body 2 may include a burner 24, a main heat exchanger 21, and a fan 25 arranged sequentially from bottom to top along its height. The burner 24 is connected to the flue gas inlet. The main heat exchanger 21 includes a main heat exchange tube at least partially located within the flue gas. The fan 25's air inlet is connected to the flue gas outlet, and its air outlet is connected to the flue gas inlet 302. The condensing heat exchange tube's water outlet is connected to the main heat exchange tube's water inlet. Both the condensing heat exchanger 3 and the water heater body 2 are housed within the casing of the condensing gas water heater 100. The bottom of the casing may have a main water inlet pipe 1 connected to the condensing heat exchange tube's water inlet, and a main water outlet pipe 26 connected to the main heat exchange tube's water outlet. When the condensing gas water heater 100 is running, the burner 24 produces high-temperature flue gas. Under the action of the fan 25, the high-temperature flue gas flows to the main heat exchanger 21 for primary heat exchange to heat the water in the main heat exchange tube. After heat exchange, the flue gas is transported by the fan 25 to the condensing heat exchanger 3 for secondary heat exchange to heat the water in the condensing heat exchange tube. In addition, the cold water in the main water inlet pipe 1 can be preheated by passing through the condensing heat exchange tube before being transported to the main heat exchange tube for heating. In this way, the latent heat of vaporization of the flue gas can be fully utilized, saving energy and improving the hot water production efficiency.

[0049] It is understandable that condensate will inevitably be generated during the heat exchange process of high-temperature flue gas flowing through the condenser heat exchanger 3. To effectively solve the problem of condensate discharge, this embodiment includes an atomizing module 4 in the water heater 100. The high-temperature flue gas generated by the water heater body 2 enters the housing 31 through the flue gas inlet 302 of the condenser heat exchanger 3, and fully exchanges heat with the condenser heat exchange tubes inside the housing 31, thereby heating the water flow inside the condenser heat exchange tubes and improving thermal efficiency. During this process, water vapor in the flue gas condenses into water on the surface of the condenser heat exchange tubes upon cooling, and this condensate then collects in the water collection chamber 301. By installing the atomizing module 4 in the water collection chamber 301, the accumulated condensate can be atomized into fine water mist, which is carried away by the flow of flue gas and discharged outside the machine along with the exhaust gas. This eliminates the need for dedicated condensate pipes and manual collection and emptying of water using collection containers, fundamentally avoiding pipe corrosion problems that may be caused by directly discharging acidic condensate into the sewer. It also eliminates the risk of overflow due to users forgetting to clean the collection tank, thus achieving in-situ treatment of condensate and no external discharge, achieving self-cleaning and maintenance-free effects, and improving the safety and convenience of using the condensing gas water heater 100.

[0050] Although the atomizing module 4 can achieve a certain degree of condensate treatment, when the condensate generation rate is too fast or the atomization capacity is limited, the liquid level in the water collection chamber 301 may continue to rise, posing a risk of backflow into the combustion chamber of the water heater body 2, affecting combustion safety. Therefore, the water heater 100 in this embodiment also includes a water circuit switching component 5, which has a first working mode and a second working mode. When the water heater 100 is running, the water circuit switching component 5 operates in the first working mode, sequentially connecting the inlet main pipe 1, the condenser heat exchanger 3, and the main heat exchanger 21 to form a first flow path. The cold water in the inlet main pipe 1 first flows through the condenser heat exchanger 3, where it is heated by the waste heat of the high-temperature flue gas, achieving full recovery of the latent heat of vaporization in the flue gas and improving the overall thermal efficiency. The preheated water then enters the main heat exchanger 21 for further heating, ultimately outputting hot water at the required temperature. In this mode, the waste heat of the flue gas is effectively utilized, and the generated condensate continuously collects in the water collection chamber 301. After being atomized by the atomization module 4, it is discharged with the flue gas, achieving automatic condensate treatment. However, when the liquid level in the water collection chamber 301 is detected to be too high, posing a risk of overflow or backflow, the water circuit switching component 5 can be automatically or manually switched to the second working mode. At this time, the main water inlet pipe 1 is directly connected to the main heat exchanger 21, forming a second flow path, while the inlet and / or outlet of the condensing heat exchanger 3 are cut off, and no water flows through the condensing heat exchanger 3, causing it to exit the heat exchange process. In this way, the condensing heat exchanger 3 no longer preheats the water flow, and the flue gas temperature rises accordingly, thereby enhancing the thermal and flow capacity of the flue gas, which is more conducive to atomizing and carrying away the residual condensate. At the same time, it stops the generation of new condensate, causing the liquid level in the water collection chamber 301 to gradually decrease, preventing condensate from flowing back into the combustion chamber, and ensuring the safety and stability of the water heater 100 operation.

[0051] Understandably, there are many ways to implement the waterway switching component 5; please refer to [link / reference]. Figures 1 to 4 In one embodiment of the present invention, the main water inlet pipe 1 is connected to the water inlet end of the condensing heat exchanger 3 through the first pipe 6, and the water outlet end of the condensing heat exchanger 3 is connected to the water inlet end of the main heat exchanger 21 through the second pipe 7; the water circuit switching component 5 includes a bypass pipe 51 and a three-way valve 52, the bypass pipe 51 connects the second pipe 7 and the first pipe 6; the three-way valve 52 is located at the junction of the bypass pipe 51 and the second pipe 7; or, the three-way valve 52 is located at the junction of the main water inlet pipe 1, the first pipe 6 and the bypass pipe 51.

[0052] In this embodiment, the main inlet pipe 1 is connected to the inlet end of the condenser heat exchanger 3 via the first pipe 6, and the outlet end of the condenser heat exchanger 3 is connected to the inlet end of the main heat exchanger 21 via the second pipe 7, forming a series loop. The water circuit switching assembly 5 includes a bypass pipe 51 and a three-way valve 52. The bypass pipe 51 connects the first pipe 6 and the second pipe 7 to form a bypass path that bypasses the condenser heat exchanger 3; the installation position of the three-way valve 52 can be set according to actual needs. Figure 1 and Figure 2 As shown, in one arrangement, the three-way valve 52 can be located at the junction of the bypass pipe 51 and the second pipe 7. When the water circuit switching assembly 5 is in the first working mode, the three-way valve 52 connects the first pipe 6 and the second pipe 7, allowing water to flow sequentially through the condenser heat exchanger 3 and the main heat exchanger 21, achieving preheating and efficient heat exchange; when the water circuit switching assembly 5 switches to the second working mode, the three-way valve 52 closes the passage between the first pipe 6 and the second pipe 7, and instead connects the bypass pipe 51 and the second pipe 7, allowing cold water from the main inlet pipe 1 to flow through the first pipe 6 into the bypass pipe 51, and then through the three-way valve 52 into the second pipe 7, directly delivering it to the main heat exchanger 21 for heating, thereby cutting off the path of water flowing through the condenser heat exchanger 3. Figure 3 As shown, in another arrangement, a three-way valve 52 is located at the intersection of the main inlet pipe 1, the first pipe 6, and the bypass pipe 51. In this case, the three-way valve 52 can directly control whether the water flow from the main inlet pipe 1 enters the first pipe 6 and flows to the condenser heat exchanger 3, or enters the bypass pipe 51 and flows directly to the main heat exchanger 21.

[0053] By working together with the three-way valve 52 and the bypass pipe 51, the switching between the first working mode and the second working mode can be realized. While ensuring efficient and energy-saving operation, the risk of backflow caused by condensate accumulation is avoided, thus improving the safety of the water heater 100.

[0054] Waterway switching component 5 can also be implemented in the following ways, please refer to [link / reference]. Figure 5 and Figure 8 In one embodiment of the present invention, the main water inlet pipe 1 is connected to the water inlet end of the condensing heat exchanger 3 through the first pipe 6, and the water outlet end of the condensing heat exchanger 3 is connected to the water inlet end of the main heat exchanger 21 through the second pipe 7; the water circuit switching component 5 includes a bypass pipe 51, a first switching valve 53 and a second switching valve 54, the bypass pipe 51 connects the second pipe 7 and the first pipe 6, the first switching valve 53 is disposed on the bypass pipe 51; the second switching valve 54 is disposed on the first pipe 6 between the bypass pipe 51 and the water inlet end of the condensing heat exchanger 3; or, the second switching valve 54 is disposed on the second pipe 7 between the bypass pipe 51 and the water outlet end of the condensing heat exchanger 3.

[0055] In this embodiment, the main inlet pipe 1 is connected to the inlet end of the condenser heat exchanger 3 via the first pipe 6, and the outlet end of the condenser heat exchanger 3 is connected to the inlet end of the main heat exchanger 21 via the second pipe 7, forming a series loop. The water circuit switching assembly 5 includes a bypass pipe 51, a first switching valve 53, and a second switching valve 54. The bypass pipe 51 connects the first pipe 6 and the second pipe 7 to form a bypass path that bypasses the condenser heat exchanger 3; the first switching valve 53 is installed on the bypass pipe 51 to control the opening and closing of the bypass pipe 51; the second switching valve 54 can be installed in two different positions according to design requirements: one, such as... Figure 8 and Figure 9 As shown, the second switching valve 54 is located on the first pipeline 6, in the section between the inlet end of the condenser heat exchanger 3 and the bypass pipe 51, and is used to control whether water flows into the condenser heat exchanger 3; secondly, as Figure 7 and Figure 8 As shown, the second switching valve 54 is located on the second pipeline 7, in the section between the outlet end of the condenser heat exchanger 3 and the bypass pipe 51, and is used to control whether the water flowing out of the condenser heat exchanger 3 enters the main heat exchanger 21.

[0056] When the water heater 100 is running, and the water circuit switching component 5 is operating in the first working mode, the second switch valve 54 is opened and the first switch valve 53 is closed. Cold water in the main inlet pipe 1 flows through the first pipe 6 into the condenser heat exchanger 3 for preheating, and then flows through the second pipe 7 into the main heat exchanger 21 for further heating, achieving efficient and energy-saving operation. At this time, the condenser heat exchanger 3 operates normally and produces condensate. When the liquid level in the water collection chamber 301 reaches the first preset liquid level, the atomization module 4 can be activated to atomize the condensate in the water collection chamber 301 and discharge it through the exhaust port 303. When the liquid level in the water collection chamber 301 reaches the second preset level, posing a risk of backflow, the water circuit switching component 5 can be manually or automatically switched to the second working mode. The first switch valve 53 opens, and the second switch valve 54 closes. At this time, the cold water in the main inlet pipe 1 flows into the bypass pipe 51 through the first pipe 6, and then enters the second pipe 7 through the opened first switch valve 53, directly supplying it to the main heat exchanger 21 for heating. Meanwhile, the inlet or outlet path of the condenser heat exchanger 3 is cut off by the second switch valve 54, and no water flows through it, thus stopping the generation of condensate. At the same time, the flue gas temperature increases, which helps to atomize and discharge the residual condensate in the water collection chamber 301, reducing the liquid level in the water collection chamber 301, ensuring combustion safety, and improving the operational stability and safety of the water heater 100 under different operating conditions.

[0057] Please see Figures 1 to 8In one embodiment of the present invention, the water heater body 2 has a flue, the main heat exchanger 21 is disposed in the flue, and the condensing heat exchanger 3 includes a shell 31 and a condensing heat exchange tube. The shell 31 has a water collection cavity 301, and a flue inlet 302 and a flue outlet 303 communicating with the water collection cavity 301. The flue inlet 302 is communicating with the flue, and the condensing heat exchange tube is disposed in the shell 31 and located above the water collection cavity 301.

[0058] In this embodiment, the condensing heat exchanger 3 includes a shell 31 and condensing heat exchange tubes. A water collection chamber 301 is provided inside the shell 31, and a flue gas inlet 302 and a flue gas outlet 303 communicating with the water collection chamber 301 are provided on the shell 31. The flue gas inlet 302 is connected to the flue of the water heater body 2, allowing the high-temperature flue gas discharged from the main heat exchanger 21 to enter the shell 31 of the condensing heat exchanger 3 through the flue gas inlet 302. The condensing heat exchange tubes are disposed inside the shell 31 and above the water collection chamber 301. The flue gas flows from top to bottom across the surface of the condensing heat exchange tubes within the shell 31, undergoing sufficient heat exchange with the cold water flowing inside the condensing heat exchange tubes, releasing latent heat of vaporization, thereby improving the overall thermal efficiency of the unit. During this process, water vapor in the flue gas condenses into condensate upon cooling, flowing downwards along the surface of the condenser heat exchange tube and the inner wall of the shell 31, and finally collecting in the water collection cavity 301 at the bottom of the shell 31, which facilitates subsequent atomization treatment by the atomization module 4 and discharge with the flue gas from the exhaust port 303.

[0059] It is worth noting that the atomizing module 4 can be positioned facing and corresponding to the exhaust port 303. In this way, after the atomizing module 4 atomizes the condensate in the water collection chamber 301, the water mist can be efficiently carried out by the airflow of the flue gas and discharged from the exhaust port 303 along with the flue gas, achieving smooth integrated exhaust and drainage. Since the atomization direction is consistent with the flue gas discharge direction, the carrying efficiency of the water mist is improved, preventing the atomized water vapor from remaining or recondensing inside the casing 31, effectively preventing secondary water accumulation. Furthermore, positioning the atomizing module 4 facing and corresponding to the exhaust port 303 also helps to shorten the water mist discharge path, reduce flow resistance, further improve the timeliness and reliability of condensate treatment, and ensure the long-term stable operation of the water heater 100.

[0060] To improve the automation level of the water heater 100, please refer to [link / reference]. Figure 8 and Figure 9 In one embodiment of the present invention, the water heater body 2 further includes a control device 22, which is electrically connected to the water circuit switching component 5. The control device 22 is used to control the water circuit switching component 5 to work in a first working mode when the liquid level in the water collection chamber 301 reaches a first preset liquid level, and to control the water circuit switching component 5 to work in a second working mode when the liquid level in the water collection chamber 301 reaches a second preset liquid level.

[0061] In this embodiment, the control device 22 is electrically connected to the water circuit switching component 5 to obtain the liquid level in the water collection chamber 301 and switch between the first and second working modes of the water circuit switching component 5 according to the liquid level in the water collection chamber 301. When the water heater 100 is running, the water circuit switching component 5 operates in the first working mode, connecting the inlet main pipe 1, the condenser heat exchanger 3, and the main heat exchanger 21 in sequence to form a first flow path. The cold water in the inlet main pipe 1 first flows through the condenser heat exchanger 3, where it is heated by the waste heat of the high-temperature flue gas, thus fully recovering the latent heat of vaporization in the flue gas and improving the overall thermal efficiency. The preheated water then enters the main heat exchanger 21 for further heating, finally outputting hot water at the required temperature. At the same time, the control device 22 obtains the liquid level in the water collection chamber 301 in real time. When it determines that the liquid level in the water collection chamber 301 has reached the first preset liquid level, it indicates that a certain amount of condensate has accumulated in the water collection chamber 301. The atomization module 4 is then activated to atomize and discharge the condensate, achieving coordinated operation of energy saving and condensate treatment. As the water heater 100 operates for an extended period, the rate of condensate generation may exceed the atomization discharge rate. When the liquid level in the water collection chamber 301 rises to the second preset level, it indicates a risk of condensate overflow or backflow. The control device 22 then controls the water circuit switching component 5 to switch to the second operating mode. In this mode, the main inlet pipe 1 is directly connected to the main heat exchanger 21, forming a second flow path. The inlet and / or outlet of the condenser heat exchanger 3 are cut off, preventing water from flowing through it and thus removing it from the heat exchange process. As a result, the condenser heat exchanger 3 no longer preheats the water flow, leading to a corresponding increase in flue gas temperature. This enhances the thermal and flow capacity of the flue gas, making it easier to atomize and carry away residual condensate. Simultaneously, it stops the generation of new condensate, causing the liquid level in the water collection chamber 301 to gradually decrease. This prevents condensate from flowing back into the combustion chamber, ensuring the safety and stability of the water heater 100's operation.

[0062] To detect the liquid level in the water collection chamber 301, please refer to [link / reference]. Figure 8 and Figure 9 In one embodiment of the present invention, the water heater body 2 further includes a liquid level detection device 23, which is electrically connected to the control device 22. The liquid level detection device 23 is used to detect the liquid level in the water collection chamber 301, and outputs a first detection signal to the control device 22 when the liquid level in the water collection chamber 301 reaches a first preset liquid level, and outputs a second detection signal to the control device 22 when the liquid level in the water collection chamber 301 reaches a second preset liquid level.

[0063] In this embodiment, the liquid level detection device 23 includes a first liquid level detection element 231 and a second liquid level detection element 232, which are electrically connected to the control device 22. The first liquid level detection element 231 can be implemented using a probe, which is located at a first preset liquid level in the water collection cavity 301 to detect the first preset liquid level in the water collection cavity 301. Similarly, the second liquid level detection element 232 can also be implemented using a probe, which is located at a second preset liquid level in the water collection cavity 301 to detect the second preset liquid level in the water collection cavity 301. The type of probe is not limited here.

[0064] During the operation of the water heater 100, condensate continuously collects in the water collection chamber 301. When the first liquid level detection element 231 detects that the liquid level in the water collection chamber 301 has reached the first preset liquid level, it outputs a first detection signal to the control device 22, triggering the control device 22 to start the atomization module 4 to begin atomizing the condensate in the water collection chamber 301, thereby achieving active discharge of the condensate and ensuring the continuous operation of the efficient heat exchange process.

[0065] If the water heater 100 continues to operate, the rate of condensate generation exceeds the rate of atomization discharge, causing the liquid level in the water collection chamber 301 to continue rising. When the second liquid level detector 232 detects that the liquid level in the water collection chamber 301 has reached the second preset liquid level, it outputs a second detection signal to the control device 22. Based on the received second detection signal, the control device 22 determines that there is a risk of condensate overflow or backflow in the water heater 100, and then controls the water circuit switching component 5 to switch from the first working mode to the second working mode, cutting off the water circuit of the condenser heat exchanger 3 so that cold water no longer flows through the condenser heat exchanger 3, stopping further condensate generation. At the same time, it increases the exhaust gas temperature to enhance the ability of the flue gas to carry residual water mist, causing the liquid level in the water collection chamber 301 to drop.

[0066] To improve the user experience, please refer to Figure 8 and Figure 9 In one embodiment of the present invention, the water heater body 2 further includes a burner 24, a fan 25, a main outlet pipe 26, and a temperature detection device 27. The main outlet pipe 26 is connected to the main heat exchanger 21, and the temperature detection device 27 is electrically connected to the control device 22. The temperature detection device 27 is used to detect the outlet water temperature of the main outlet pipe 26. The control device 22 is also used to adjust the combustion load of the burner 24 according to the detected outlet water temperature of the main outlet pipe 26, and control the speed of the fan 25 to change accordingly with the change of the combustion load of the burner 24, so that the outlet water temperature of the main outlet pipe 26 reaches the target outlet water temperature.

[0067] In this embodiment, the water heater body 2, in addition to the burner 24, fan 25, and main outlet pipe 26 mentioned above, also includes a temperature detection device 27. The temperature detection device 27 is installed on the main outlet pipe 26 and is used to detect the temperature of the hot water output after heating by the main heat exchanger 21 in real time, and feeds back the detected outlet temperature to the control device 22. The control device 22 compares the received outlet temperature with the target outlet temperature set by the user, calculates the deviation between the current outlet temperature and the target outlet temperature, and then adjusts the combustion load of the burner 24. For example, when the detected outlet temperature is lower than the target outlet temperature, the control device 22 increases the combustion load of the burner 24, that is, increases the gas supply and improves the combustion intensity to increase heat exchange; when the detected outlet temperature is close to or reaches the target outlet temperature, the combustion load of the burner 24 is reduced accordingly to avoid overheating and achieve precise temperature control. At the same time, the control device 22 also synchronously adjusts the speed of the fan 25 according to the change in the combustion load of the burner 24. When the combustion load of burner 24 increases, control device 22 increases the speed of fan 25 to increase air intake, ensure complete combustion, improve combustion efficiency and reduce emissions; when the combustion load of burner 24 decreases, the speed of fan 25 decreases accordingly to reduce unnecessary air volume and noise, and achieve energy-saving and quiet operation.

[0068] By setting the temperature detection device 27, the water heater 100 can dynamically match the combustion output with the water demand, which can not only ensure a stable and comfortable water temperature and avoid discomfort caused by water temperature fluctuations, but also optimize combustion efficiency, reduce energy consumption and operating noise, and improve the user experience.

[0069] In one embodiment of the present invention, the combustion load of the burner 24 is positively correlated with the rotational speed of the fan 25.

[0070] In this embodiment, the combustion load of the burner 24 is positively correlated with the rotational speed of the fan 25. That is, the greater the combustion load, the more air is required, and the rotational speed of the fan 25 increases accordingly; the smaller the combustion load, the lower the rotational speed of the fan 25. The control device 22 adjusts the gas supply to the burner 24 to change the combustion intensity based on the deviation between the outlet water temperature detected by the temperature detection device 27 and the target outlet water temperature. Simultaneously, according to a preset matching relationship, it synchronously adjusts the rotational speed of the fan 25 to match the current combustion load. For example, when the user turns on the hot water and the outlet water temperature is low, the control device 22 increases the combustion load, increases the gas input, and simultaneously increases the rotational speed of the fan 25 to ensure sufficient oxygen supply and achieve efficient and clean combustion. When the outlet water temperature approaches the target outlet water temperature, the combustion load decreases, and the rotational speed of the fan 25 decreases accordingly to avoid energy waste and increased noise caused by excessive blowing.

[0071] Please see Figure 8 and Figure 9In one embodiment of the present invention, the control device 22 is specifically used to control the burner 24 to operate at a first preset combustion load and control the fan 25 to operate at a first preset speed when the temperature difference between the outlet water temperature of the main outlet pipe 26 and the target outlet water temperature is within a first preset temperature difference range; and to control the burner 24 to operate at a second preset combustion load and control the fan 25 to operate at a second preset speed when the temperature difference between the outlet water temperature of the main outlet pipe 26 and the target outlet water temperature is within a second preset temperature difference range; the second preset combustion load is greater than the first preset combustion load, and the second preset speed is greater than the first preset speed.

[0072] In this embodiment, when the control device 22 detects that the temperature difference between the outlet water temperature of the main outlet pipe 26 and the target outlet water temperature is within the first preset temperature difference range, for example, a small temperature difference (within ±2℃), it indicates that the current water temperature is close to the set value, and the water heater 100 enters the constant temperature maintenance stage. At this time, the control device 22 controls the burner 24 to operate at a lower first preset combustion load and simultaneously adjusts the fan 25 to operate at a lower first preset speed to achieve stable combustion under low load. This reduces gas consumption and fan 25 noise, avoids water temperature fluctuations caused by frequent start-stop or combustion intensity fluctuations, thereby improving the stability of hot water output and user comfort. When the temperature difference between the outlet water temperature and the target outlet water temperature is within the second preset temperature difference range, for example, a large temperature difference (within ±5℃), it indicates that the water heater 100 needs to quickly raise the water temperature. This may be due to the user just turning on the hot water, a sudden increase in water consumption, or the water circuit switching component 5 being in the second working mode and not activating the condenser heat exchanger 3, resulting in the inlet water entering the main heat exchanger 21 without preheating, and the inlet water temperature being low. In this situation, the control device 22 determines that the heating capacity needs to be enhanced, and then controls the burner 24 to switch to a higher second preset combustion load to increase the combustion intensity and heat exchange. At the same time, the fan 25 also increases to a higher second preset speed to ensure that the air intake volume matches the gas supply volume, ensuring full and efficient combustion. By increasing the heat output capacity, the water heater 100 can quickly raise the water temperature to the set value, shorten the user's waiting time, and improve the user experience.

[0073] The present invention also proposes a control method for a water heater 100, wherein the water heater 100 is as described above, and the specific structure of the water heater 100 is as described in the above embodiments. Since the control method of the water heater 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0074] Based on the above hardware structure, please refer to Figure 10 The control method for the water heater 100 includes:

[0075] S100. The water circuit switching component operates in the first working mode. In the first working mode, the water circuit switching component connects the inlet main pipe, the condenser heat exchanger and the main heat exchanger in sequence to form the first flow path.

[0076] S200, Obtain the liquid level in the water collection chamber;

[0077] S300: When the liquid level in the water collection chamber reaches the first preset liquid level, control the atomization module to start so as to atomize the condensate in the water collection chamber.

[0078] S400. When the liquid level in the water collection chamber reaches the second preset liquid level, the water path switching component is controlled to work in the second working mode. In the second working mode, the water path switching component connects the main water inlet pipe to the main heat exchanger to form a second flow path, and disconnects the water inlet end and / or water outlet end of the condenser heat exchanger from the second flow path.

[0079] In this embodiment, during the startup and continuous operation of the water heater 100, the water heater 100 controls the water circuit switching component 5 to operate in a first working mode. In this mode, the water circuit switching component 5 sequentially connects the inlet main pipe 1, the condenser heat exchanger 3, and the main heat exchanger 21 to form a first flow path. This allows cold water from the inlet main pipe 1 to first flow through the condenser heat exchanger 3, where it is preheated by the high-temperature flue gas, fully recovering the latent heat of vaporization in the flue gas. The water then enters the main heat exchanger 21 for heating, thereby improving the overall thermal efficiency and achieving energy-saving operation. During this process, condensate is generated after the flue gas cools. The condensate flows down the surface of the condenser heat exchanger 3 and collects in the water collection chamber 301 at the bottom of the condenser heat exchanger 3. Simultaneously, the water heater 100 can obtain the liquid level in the water collection chamber 301 in real time through the liquid level detection device 23, enabling the detection of the condensate accumulation state. When the water heater 100 determines that the liquid level in the water collection chamber 301 has reached the first preset liquid level, the water heater 100 activates the atomization module 4 to atomize the condensate in the water collection chamber 301 into fine water mist, and discharges it outside the machine with the help of flue gas flow, realizing automatic and non-external discharge treatment of condensate, avoiding the inconvenience of acidic condensate corroding the drainage pipe or requiring manual emptying of the water collection tank. If the water heater 100 continues to operate, the condensate generation rate exceeds the atomization discharge rate, causing the liquid level in the water collection chamber 301 to rise continuously to the second preset liquid level, indicating a safety risk of condensate overflow or backflow into the combustion chamber. Therefore, the water heater 100 controls the water circuit switching component 5 to switch to the second working mode. In this mode, the main water inlet pipe 1 is directly connected to the main heat exchanger 21 to form a second flow path, and at the same time, the inlet end and / or outlet end of the condenser heat exchanger 3 are switched so that the water no longer flows through the condenser heat exchanger 3, stopping its heat exchange function, thereby preventing the generation of new condensate. Since the cold water is directly connected to the main heat exchanger 21 without preheating, the flue gas temperature increases accordingly, which enhances the thermal and flow capacity of the flue gas. This is more conducive to atomizing and discharging the residual condensate in the water collection chamber 301, causing the liquid level in the water collection chamber 301 to drop and reducing the risk of condensate backflow.

[0080] Through the above control method, this embodiment can maximize heat recovery efficiency and automatically handle condensate under normal operating conditions, while automatically switching the flow path when the liquid level is abnormally high, ensuring the safety of the water heater 100 and improving the reliability and ease of use of the water heater 100.

[0081] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A water heater, characterized in that, The water heater includes: Main inlet pipe; The water heater body, including the main heat exchanger; A condensing heat exchanger having a water collection chamber for collecting the condensate produced by the condensing heat exchanger; An atomizing module, located in the water collection chamber, is used to atomize the condensate in the water collection chamber; A water path switching assembly is disposed between the main water inlet pipe, the main heat exchanger, and the condenser heat exchanger. The water path switching assembly has a first working mode and a second working mode. In the first working mode, the water path switching assembly is used to sequentially connect the main water inlet pipe, the condenser heat exchanger, and the main heat exchanger to form a first flow path. In the second working mode, the water path switching assembly is used to connect the main water inlet pipe and the main heat exchanger to form a second flow path, and disconnect the inlet end and / or outlet end of the condenser heat exchanger from the second flow path. The water heater body also includes a control device and a liquid level detection device. The control device is electrically connected to the liquid level detection device and the water circuit switching component, respectively. The liquid level detection device is used to detect the liquid level in the water collection chamber, and outputs a first detection signal to the control device when the liquid level in the water collection chamber reaches a first preset liquid level, and outputs a second detection signal to the control device when the liquid level in the water collection chamber reaches a second preset liquid level. The control device is used to control the water circuit switching component to operate in a first working mode and control the atomizing module to start when receiving the first detection signal, so as to atomize the condensate in the water collection chamber, and to control the water circuit switching component to operate in a second working mode and control the atomizing module to operate when receiving the second detection signal, so as to atomize the condensate in the water collection chamber, wherein the second preset liquid level is higher than the first preset liquid level.

2. The water heater as described in claim 1, characterized in that, The main inlet pipe is connected to the inlet of the condenser heat exchanger via a first pipe, and the outlet of the condenser heat exchanger is connected to the inlet of the main heat exchanger via a second pipe; the water circuit switching assembly includes a bypass pipe and a three-way valve, and the bypass pipe connects the second pipe and the first pipe; The three-way valve is located at the junction of the bypass pipe and the second pipe; Alternatively, the three-way valve may be located at the junction of the main inlet pipe, the first pipe, and the bypass pipe.

3. The water heater as described in claim 1, characterized in that, The main inlet pipe is connected to the inlet of the condenser heat exchanger via a first pipe, and the outlet of the condenser heat exchanger is connected to the inlet of the main heat exchanger via a second pipe; the water circuit switching assembly includes a bypass pipe, a first switching valve, and a second switching valve, the bypass pipe connecting the second pipe and the first pipe, and the first switching valve being located on the bypass pipe. The second switching valve is located on the first pipeline between the bypass pipe and the water inlet of the condenser heat exchanger; Alternatively, the second switching valve may be located on a second pipeline between the bypass pipe and the outlet of the condenser heat exchanger.

4. The water heater as described in claim 1, characterized in that, The water heater body has a flue, the main heat exchanger is located in the flue, the condensing heat exchanger includes a shell and a condensing heat exchange tube, the shell has the water collection cavity, and a flue inlet and a flue outlet communicating with the water collection cavity, the flue inlet is communicating with the flue, and the condensing heat exchange tube is located inside the shell and above the water collection cavity.

5. The water heater as described in claim 1, characterized in that, The water heater body also includes a burner, a fan, a main outlet pipe, and a temperature detection device. The main outlet pipe is connected to the main heat exchanger, and the temperature detection device is electrically connected to the control device. The temperature detection device is used to detect the outlet water temperature of the main outlet pipe. The control device is also used to adjust the combustion load of the burner according to the detected outlet water temperature of the main outlet pipe, and control the speed of the fan to change accordingly with the change of the combustion load of the burner, so that the outlet water temperature of the main outlet pipe reaches the target outlet water temperature.

6. The water heater as described in claim 5, characterized in that, The combustion load of the burner is positively correlated with the rotational speed of the fan.

7. The water heater as described in claim 6, characterized in that, The control device is specifically used to control the burner to operate at a first preset combustion load and the fan to operate at a first preset speed when the temperature difference between the outlet water temperature of the main outlet pipe and the target outlet water temperature is within a first preset temperature difference range; and to control the burner to operate at a second preset combustion load and the fan to operate at a second preset speed when the temperature difference between the outlet water temperature of the main outlet pipe and the target outlet water temperature is within a second preset temperature difference range; wherein the second preset combustion load is greater than the first preset combustion load and the second preset speed is greater than the first preset speed.

8. A method for controlling a water heater, characterized in that, The water heater is the water heater as described in any one of claims 1 to 7, and the control method of the water heater includes: The water circuit switching component operates in the first working mode. In the first working mode, the water circuit switching component sequentially connects the inlet main pipe, the condenser heat exchanger and the main heat exchanger to form the first flow path. Obtain the liquid level in the water collection chamber; When the liquid level in the water collection chamber reaches the first preset liquid level, the atomization module is activated to atomize the condensate in the water collection chamber. When the liquid level in the water collection chamber reaches the second preset liquid level, the control water path switching component operates in the second working mode. In the second working mode, the water path switching component connects the main water inlet pipe to the main heat exchanger to form a second flow path, and disconnects the water inlet and / or water outlet of the condenser heat exchanger from the second flow path.

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