Gas-fired water heating apparatus

Abstract

The application discloses a kind of gas hot water equipment, comprising: shell, burner, combustion chamber, main heat exchanger, smoke hood, condensing heat exchanger, fan and drainage assembly, condensing heat exchanger includes heat exchange box and preheating pipe, heat exchange box is provided with communicating port, heat exchange box is further provided with smoke pipe, preheating pipe is located in heat exchange box, the bottom of heat exchange box is provided with drain port;Drainage assembly includes condensate water collection tank, water level sensor, drain pipe and heating pressure boost module, heating pressure boost module includes turbocharger and electric control valve;Condensate water collection tank is provided with condensate water inlet, condensate water outlet and boost inlet, water level sensor is arranged in condensate water collection tank, drain pipe is connected with condensate water outlet, the gas outlet of turbocharger is connected with boost inlet by electric control valve.The use reliability of gas hot water equipment is improved, and the requirement of condensate water automatic discharge is met.

Description

Technical Field

[0001] This invention belongs to the field of household appliance technology, and in particular relates to a gas-fired water heater. Background Technology

[0002] Water heaters are currently common household appliances. They are categorized into gas water heaters and electric water heaters, with gas water heaters being widely used due to their convenience. A typical gas water heater consists of a burner, combustion chamber, heat exchanger, and fume hood. The burner burns gas in the combustion chamber to heat the water flowing through the heat exchanger, while the flue gas is discharged outdoors through a fan in the fume hood.

[0003] After the initial heat exchange in a gas water heater, medium-temperature flue gas typically occurs at around 180℃. This flue gas has a high content of CO2 and NOx, and also contains water vapor with a high heat energy content. Direct emission of this gas not only pollutes the environment but also results in significant heat loss. Gas water heaters utilize a condensing heat exchanger for secondary heat exchange, preheating the water, recovering the latent heat of the medium-temperature flue gas, improving gas utilization, and significantly reducing the temperature of the flue gas discharged from the unit. Because the water vapor in the medium-temperature flue gas condenses into liquid condensate while releasing latent heat, and acidic gases such as CO2 and NOx in the flue gas dissolve in the condensate, making it corrosive, the condensate from the secondary heat exchange needs to be collected and treated centrally.

[0004] Chinese Patent Publication No. CN 217685851 U discloses a gas water heater that collects condensate in a condensing container and pumps it to a spray nozzle, which then sprays the condensate into the exhaust pipe to be discharged with the flue gas. However, the pump can be damaged by corrosion from the condensate over time, leading to reduced reliability. Therefore, the technical problem this invention aims to solve is how to design a gas water heater with high reliability that meets the requirements of condensate discharge. Summary of the Invention

[0005] This invention provides a gas-fired water heater that improves the reliability of the gas-fired water heater and meets the requirements for automatic condensate drainage.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: In one aspect, the present invention provides a gas-fired hot water device, comprising: The outer casing has a smoke outlet pipe on its exterior. A burner for burning fuel gas; Combustion chamber, wherein a combustion cavity is formed; Main heat exchanger; A smoke collection hood, wherein a smoke exhaust port is provided on the smoke collection hood; A condensing heat exchanger includes a heat exchange chamber and a preheating tube. The heat exchange chamber is provided with a communication port and a flue pipe. The preheating tube is located in the heat exchange chamber, and a drain port is provided at the bottom of the heat exchange chamber. A fan configured to drive air into the combustion chamber and cause the flue gas generated in the combustion chamber to be discharged from the exhaust port; A drainage assembly includes a condensate collection tank, a water level sensor, a drain pipe, and a heating and pressurizing module. The heating and pressurizing module includes a gas tank, an electric heating element, a one-way valve, and an electrically controlled valve. The electric heating element is located on the gas tank, the one-way valve is located at the inlet of the gas tank, and the electrically controlled valve is located at the outlet of the gas tank. The condensate collection tank is provided with a condensate inlet, a condensate outlet, and a pressurizing air inlet. The water level sensor is arranged in the condensate collection tank. The drain pipe is connected to the condensate outlet, and the electrically controlled valve is connected to the pressurizing air inlet. The combustion chamber and the fan are housed within the outer casing. The burner is located within the combustion chamber, the main heat exchanger is located above the combustion chamber, the smoke hood covers the top of the main heat exchanger, the exhaust port is connected to the connecting port, the exhaust pipe is connected to the smoke outlet channel, the drain port is connected to the condensate inlet, the drain pipe extends into the smoke outlet channel, and the one-way valve is connected to the air outlet side of the fan via a gas pipe.

[0007] By adding an additional drainage component, the condensate collection tank within the drainage component can temporarily store the condensate discharged from the heat exchange chamber. Once the condensate in the collection tank reaches a certain level, a water level sensor detects the water level signal, triggering the heating and pressurizing module to start. The gas tank in the heating and pressurizing module is injected with airflow at a certain pressure from a blower via a one-way valve, and further heated by an electric heating element to create higher-pressure gas. When it is necessary to discharge the condensate from the collection tank, the electric control valve opens, increasing the overall gas pressure in the collection tank due to the high-pressure airflow output from the heating and pressurizing module. Finally, under the pressure, the condensate in the collection tank is forced into the drain pipe and ultimately discharged outdoors through the flue pipe. This not only meets the requirement of eliminating the need for manual condensate handling by the user but also avoids equipment damage caused by condensate corrosion over long-term use, thus improving the reliability of the gas-fired water heater and meeting the requirement for automatic condensate discharge.

[0008] In one embodiment of this application, the electric heating component is a thick film wrapped around the outside of the gas tank.

[0009] In one embodiment of this application, the electric heating component is an electric heating tube inserted into the gas tank.

[0010] In one embodiment of this application, the gas tank is further provided with a pressure sensor, which is configured to trigger the electric heating component to turn off the power; the water level sensor is configured to trigger the electric heating component to turn on the power.

[0011] In one embodiment of this application, the interior of the condensate collection tank is provided with an overflow plate, which divides the interior of the condensate collection tank into a first cavity and a second cavity. The condensate inlet is arranged at the top of the condensate collection tank and communicates with the first cavity, and the condensate outlet is arranged at the bottom of the condensate collection tank and communicates with the second cavity.

[0012] In one embodiment of this application, an overflow port is formed between the overflow plate and the top of the condensate collection tank; a one-way valve plate is provided in the condensate collection tank, the top of the one-way valve plate is rotatably disposed in the condensate collection tank and located above the overflow plate, and the one-way valve plate is configured to overlap the overflow plate after pressurized gas is injected into the second cavity to close the overflow port.

[0013] In one embodiment of this application, the main heat exchanger includes a heat exchange tube and two end plates, the two end plates are arranged opposite to each other, and the heat exchange tube passes through the two end plates; The front and rear panels of the combustion chamber are provided with upwardly extending extensions, and an installation area is formed between the two extensions. The main heat exchanger is located in the installation area, the extension is connected to the lower edge of the smoke hood, and the end plate is connected between the side plates of the smoke hood and the corresponding side of the combustion chamber.

[0014] In one embodiment of this application, the condensing heat exchanger is arranged on one side of the smoke hood.

[0015] In one embodiment of this application, the smoke hood is provided with a smoke exhaust port on its side, and the smoke exhaust port is connected to the communication port through a horizontally arranged flue.

[0016] In one embodiment of this application, the lower edge of the end plate overlaps the corresponding side plate, and the upper edge of the end plate overlaps the lower edge of the smoke hood.

[0017] In one embodiment of this application, the extension overlaps the lower edge of the smoke hood.

[0018] In one embodiment of this application, the main heat exchanger further includes a bypass pipe, which is connected between the two ends of the heat exchange tube. Attached Figure Description

[0019] 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the gas-fired hot water device of the present invention; Figure 2 This is an assembly diagram of the combustion chamber, heat exchanger, smoke hood, and condenser heat exchanger in one embodiment of the gas-fired hot water equipment of the present invention. Figure 3 for Figure 1 One of the structural schematic diagrams of the condensate collection tank; Figure 4 for Figure 1 Schematic diagram of the structure of the condensate collection tank (Part 2); Figure 5 for Figure 1 A schematic diagram of the main heat exchanger.

[0021] Explanation of reference numerals in the attached figures: Outer casing 1, water inlet pipe 11, water outlet pipe 12, smoke outlet pipe 13; Burner 2; Combustion chamber 3, front panel 31, rear panel 32, extension 33, heat insulation layer 34; Main heat exchanger 4, heat exchange tube 41, end plate 42, bypass pipe 43, fins 44; Smoke hood 5; Condensing heat exchanger 6; Heat exchanger body 61, flue pipe 62, drain outlet 63; Fan 7; Drainage component 8; Condensate collection tank 81, drain pipe 82, heating and pressurizing module 83; Condensate inlet 811, condensate outlet 812, booster air inlet 813, overflow plate 814, one-way valve plate 815; Gas tank 831, electric heating component 832, one-way valve 833, electric control valve 834. Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that in the description of this invention, the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0027] Gas-fired water heaters are water heaters that use gas as the main energy source. They produce hot water by transferring the high-temperature heat generated by the combustion of gas to cold water flowing through a heat exchanger.

[0028] Gas-fired water heaters typically include an outer casing, as well as components such as burners, heat exchangers, fans, and smoke hoods housed within the casing.

[0029] In this process, the gas is delivered to the burner, where it is ignited by an ignition device, so that the burner can burn the delivered gas and generate heat.

[0030] The heat exchanger is equipped with heat exchange tubes. One end of the heat exchange tubes is connected to the water supply pipe, and the other end of the heat exchange tubes is connected to a shower head or faucet.

[0031] The heat generated by the burner burning the gas is used to heat the heat exchange tubes, thereby raising the temperature of the water inside the heat exchange tubes to form hot water.

[0032] When the gas-fired water heater is working, cold water supplied by the water supply pipeline flows into the heat exchange tube, and is then heated into hot water by the heat source generated by the burner. The hot water then flows out from the shower or faucet through the hot water valve for the user's use.

[0033] Meanwhile, during the operation of the gas-fired hot water equipment, the fan is powered on and running simultaneously. Under the action of the fan, the flue gas generated by the burner is discharged outdoors.

[0034] Example 1, as Figures 1-4 As shown, this embodiment proposes a gas-fired water heating device, including: The outer casing 1 is provided with a water inlet pipe 11 and a water outlet pipe 12, and a smoke outlet pipe 13 is also provided on the outside of the outer casing; Burner 2 is used to burn fuel gas; Combustion chamber 3, the front panel 31 and the rear panel 32 of combustion chamber 3 are provided with upwardly extending extensions 33, and an installation area is formed between the two extensions 33; The main heat exchanger 4 includes a heat exchange tube 41 and two end plates 42, which are arranged opposite to each other, and the heat exchange tube 41 passes through the two end plates 42. Smoke hood 5, wherein a smoke exhaust port is provided on the smoke hood; The condensing heat exchanger 6 includes a heat exchange box 61 and a preheating tube (not shown). The heat exchange box 61 is provided with a communication port and a flue pipe 62. The preheating tube is located in the heat exchange box 61, and a drain port is provided at the bottom of the heat exchange box. Fan 7, the fan is configured to drive air into the combustion chamber and cause the flue gas generated in the combustion chamber to be output from the exhaust port; The drainage assembly 8 includes a condensate collection tank 81, a water level sensor (not shown), a drain pipe 82, and a heating and pressurizing module 83. The heating and pressurizing module includes a gas tank 831, an electric heating element 832, a one-way valve 833, and an electric control valve 834. The electric heating element is located on the gas tank, the one-way valve is located at the inlet of the gas tank, and the electric control valve is located at the outlet of the gas tank. The condensate collection tank 81 is provided with a condensate inlet 811, a condensate outlet 812, and a pressurizing air inlet 813. The water level sensor is arranged in the condensate collection tank 81. The drain pipe 82 is connected to the condensate outlet 812, and the air outlet of the gas tank 831 is connected to the pressurizing air inlet 813 through the electric control valve 834. The burner 2, combustion chamber 3, main heat exchanger 4, and smoke hood 5 are housed in the outer shell 1. The burner 2 is located at the bottom of the combustion chamber 3, the main heat exchanger 4 is located in the installation area, and the smoke hood 5 is located above the main heat exchanger 4. The exhaust port is connected to the communication port, the exhaust pipe 62 is connected to the smoke outlet pipe 13, the drain port 63 is connected to the condensate inlet 811, the drain pipe 82 extends into the smoke outlet pipe 13, the heat exchange box 61 is housed in the outer shell 1, the communication port is connected to the exhaust port of the smoke hood 5, the water inlet pipe 11 is connected to the heat exchange pipe 41 through the preheating pipe, and the one-way valve is connected to the air outlet side of the fan through the air pipe.

[0035] Specifically, for the condenser heat exchanger 6, the flue gas collected by the fume hood 5 is introduced into the heat exchange box 61 and output from the exhaust pipe 62. At the same time, the preheating pipe inside the heat exchange box 61 is connected to the water inlet side of the heat exchange tube 41, so that the water entering the heat exchange tube 41 can flow into the preheating pipe to be preheated by the flue gas.

[0036] The heat exchange box 61 in the condenser heat exchanger 6 is connected to the smoke hood 5, so that the flue gas can be discharged to the outside through the exhaust pipe 62 after passing through the heat exchange box 61. Furthermore, the preheating pipe installed in the heat exchange box 61 can preheat the cold water flowing into the heat exchange pipe 41, so as to make full use of the waste heat of the flue gas to heat the water flowing in the preheating pipe, thereby improving the utilization rate of the gas heat.

[0037] During use, the condenser heat exchanger 6 will generate condensate. The condensate is collected in the heat exchange box 61 and flows by gravity through the drain 63 at the bottom to the condensate collection box 81 at the bottom, so as to collect and store the condensate.

[0038] During user operation, the amount of condensate stored in the condensate collection tank 81 gradually increases, and the water level in the condensate collection tank 81 is detected by a water level sensor. When the water level in the condensate collection tank 81 exceeds the set value, the water level sensor feeds back the detected signal to the controller configured in the gas water heater, which then triggers the drainage component 8 to start draining the condensate collection tank 81.

[0039] The specific process is as follows: After the water level sensor detects that the condensate level in the condensate collection tank 81 exceeds the set value, it sends a signal to the controller. The controller then activates the heating and pressurizing module 83 based on the signal. During normal operation of the gas-fired water heater, the fan 7 pressurizes some air and inputs it into the gas tank 831 via the one-way valve 833, resulting in a certain amount of pressurized gas stored in the tank. After the heating and pressurizing module 83 is activated, the electric heating element 832 is energized to heat the gas stored in the tank 831. Once the gas reaches a certain temperature, the electric control valve 834 opens. At this time, the gas pressure in the tank 831 increases due to the increased temperature. After the electric control valve 834 opens, the high-pressure gas in the tank 831 enters the condensate collection tank 81, causing a sudden increase in pressure within the tank. Under this pressure, the condensate in the tank flows upward along the drain pipe 82 and is eventually discharged outdoors through the flue pipe 13, thus achieving automatic condensate drainage.

[0040] After the condensate in the condensate collection tank 81 is discharged under air pressure, the water level sensor detects that the water level in the condensate collection tank 81 is lower than the set value, and the controller then controls the electric control valve 834 to close. At the same time, the electric heating component 832 is de-energized.

[0041] Instead of directly adding a water pump to the condensate collection tank 81 to discharge condensate, externally injected gas is used to increase the internal air pressure, which forces the condensate out of the outer shell. This avoids condensate corrosion of components and drainage failure, thereby improving reliability.

[0042] By adding an additional drainage component, the condensate collection tank within the drainage component can temporarily store the condensate discharged from the heat exchange chamber. Once the condensate in the collection tank reaches a certain level, a water level sensor detects the water level signal, triggering the heating and pressurizing module to start. The heating and pressurizing module then generates a pressurized airflow, which is input into the condensate collection tank. The high-pressure airflow from the heating and pressurizing module increases the overall air pressure within the condensate collection tank. Ultimately, under the influence of this air pressure, the condensate in the collection tank is forced into the drain pipe and finally discharged outdoors through the flue pipe. This not only meets the requirement of eliminating the need for manual condensate handling by the user but also avoids equipment damage caused by condensate corrosion over long-term use, preventing the proper discharge of condensate. This improves the reliability of the gas-fired water heater and meets the requirement for automatic condensate discharge.

[0043] Preferably, to more thoroughly drain the condensate from the condensate collection tank 81 and shorten the start-up time of the heating and pressurizing module 83 to reduce energy consumption, a siphon pipe (not shown) can be added to the inlet of the drain pipe 82. The siphon pipe is connected to the drain pipe 82 and extends to the outside through the smoke outlet pipe 13. The free end of the siphon pipe is lower than the height of the condensate outlet 812 on the condensate collection tank 81. In this way, once the condensate in the condensate collection tank 81 is discharged from the siphon pipe through the drain pipe 82, the siphon pipe can continuously draw condensate from the condensate collection tank 81 using the siphon principle. Therefore, during the condensate drainage process, the heating and pressurizing module 83 does not need to work continuously to reduce energy consumption, and the siphon effect can more thoroughly and effectively drain the condensate from the condensate collection tank 81.

[0044] In another embodiment of this application, the electric heating component is a thick film wrapped around the outside of the gas tank; or, the electric heating component is an electric heating tube inserted into the gas tank.

[0045] In some embodiments, the gas tank is also equipped with a pressure sensor (not shown), which is configured to trigger the electric heating element to de-energize; the water level sensor is configured to trigger the electric heating element to energize.

[0046] Specifically, during use, the airflow pressure generated by the fan 7 is limited and cannot meet the pressure requirements for condensate discharge. Therefore, it is necessary to heat the gas tank 831 to increase the gas pressure. To improve safety and reliability, during the heating process, when the gas pressure in the gas tank 831 exceeds the set pressure, the electric heating element 832 will cut off the power and stop heating. At the same time, the electric control valve 834 will open, allowing the high-pressure gas in the gas tank 831 to enter the condensate collection tank 81.

[0047] In one embodiment of this application, the condenser heat exchanger 6 is arranged on one side of the smoke hood 5.

[0048] Specifically, by arranging the condenser heat exchanger 6 on one side of the smoke hood 5, the internal space inside the outer shell 1 is fully utilized to install and distribute various functional components, thereby improving space utilization.

[0049] In one embodiment of this application, the smoke hood 5 is provided with the smoke exhaust port on its side, and the smoke exhaust port is connected to the communication port through a horizontally arranged flue.

[0050] Specifically, by setting the exhaust port on the side of the smoke hood 5, it is convenient to connect the flue to the heat exchange box 61 on one side, so that the flue gas can be quickly transported from the smoke hood 5 to the heat exchange box 61.

[0051] In some embodiments of this application, an overflow plate 814 is provided inside the condensate collection tank 81. The overflow plate 814 divides the interior of the condensate collection tank 81 into a first cavity and a second cavity. A condensate inlet 811 is arranged at the top of the condensate collection tank 81 and connects to the first cavity, and a condensate outlet 812 is arranged at the bottom of the condensate collection tank 81 and connects to the second cavity.

[0052] Specifically, an overflow plate 814 is installed inside the condensate collection tank 81 to form two interconnected chambers, a first chamber and a second chamber. A downward-extending extension pipe (unmarked) is formed from the condensate inlet 811. This extension pipe's opening is sealed by a water seal as condensate flows into the first chamber, reducing the amount of flue gas entering the condensate collection tank 81. A water level sensor is located in the second chamber to monitor the water level. Since the volume of the first chamber is smaller than the second chamber, the condensate level in the first chamber rises above the overflow plate 84, causing the condensate to primarily accumulate in the second chamber. During the condensate drainage process, airflow generated by the gas tank 831 is injected into the second chamber to utilize air pressure to drain the condensate.

[0053] In another embodiment, an overflow port is formed between the overflow plate 814 and the top of the condensate collection tank 81; a one-way valve plate 815 is provided in the condensate collection tank 81, the top of the one-way valve plate 815 is rotatably disposed in the condensate collection tank 81 and located above the overflow plate 814, and the one-way valve plate 815 is configured to overlap the overflow plate 814 to close the overflow port after pressurized gas is injected into the second cavity.

[0054] Specifically, in order to reduce the pressure loss in the second chamber due to the connection with the first chamber during the process of discharging condensate using air pressure, a one-way valve plate 815 is additionally configured in the condensate collection tank 81. The one-way valve plate 815 can be flipped open towards the second chamber.

[0055] During use, condensate overflows from the first chamber, opening the one-way valve plate 815 and flowing into the second chamber. After the gas tank 831 injects air into the second chamber, the one-way valve plate 815 will be tightly pressed against the upper edge of the overflow plate 814 under the action of air pressure, so as to close the overflow port and ensure that there is enough air pressure in the second chamber to force the condensate out.

[0056] Based on the above embodiments, optionally, in order to further reduce manufacturing costs, such as... Figure 5 As shown, the combustion chamber 3, the front panel 31 and the rear panel 32 of the combustion chamber 3 are provided with upwardly extending extensions 33, and an installation area is formed between the two extensions 33.

[0057] The burner 2, combustion chamber 3, main heat exchanger 4, and fume hood 5 are disposed in the outer shell 1. The burner 2 is arranged at the bottom of the combustion chamber 3, the main heat exchanger 4 is disposed in the installation area, and the fume hood 5 is disposed above the main heat exchanger 4. The extension 33 is connected to the lower edge of the fume hood 5, the end plate 42 is connected between the side plates of the fume hood 5 and the corresponding side of the combustion chamber 3, and the heat exchange tube 41 is connected between the inlet pipe 11 and the outlet pipe 12.

[0058] Specifically, in the actual assembly process of the gas-fired water heater in this embodiment, the main heat exchanger 4 has holes made on the two end plates 42 and heat exchange tubes 41 are inserted accordingly, so that the heat exchange tubes 41 are fixedly installed on the two end plates 42.

[0059] The main heat exchanger 4 does not have a separate shell. Therefore, during installation, the main heat exchanger 4 uses the extensions 33 formed on the front and rear sides of the combustion chamber 3 as the front and rear plates of the main heat exchanger 4. The two extensions 33 are joined together with the two end plates to form an enclosing structure. In this way, the flue gas output upward from the combustion chamber 3 is guided through the two extensions 33 into the space between the two end plates 42, so that the flue gas can exchange heat with the water flowing in the heat exchange tube 41.

[0060] Meanwhile, the top of the main heat exchanger 4 is covered by a smoke hood 5. The smoke hood 5 is arranged on the top of the main heat exchanger 4. The left and right sides of the smoke hood 5 are connected to the end plates 42 of the main heat exchanger 4, and the front and rear sides of the smoke hood 5 are connected to the upward extension 33 of the combustion chamber 3, so that the flue gas is finally collected in the smoke hood 5 and discharged uniformly.

[0061] By providing upwardly extending extensions at the top of the front and rear panels of the combustion chamber, an installation area for mounting the main heat exchanger is formed between the two extensions. During assembly, the main heat exchanger is installed in the installation area formed by the two extensions. The two end plates cooperate with the extensions to form an enclosing structure for flue gas transportation and heating of the heat exchange tubes between the two end plates. In addition, a flue gas hood covers the main heat exchanger to collect and guide the flue gas output. For the main heat exchanger, the outer shell structure is eliminated, and only two end plates are used to support and install the heat exchange tubes, effectively simplifying the overall structure of the main heat exchanger. This achieves a shell-less and tube-free design for the main heat exchanger in the gas-fired water heater, effectively simplifying the overall structure of the main heat exchanger and thus reducing the manufacturing cost of the gas-fired water heater.

[0062] Because the main heat exchanger adopts a design without coiled tubes and without a shell, the use of coiled tubes is eliminated, which solves the problem of corrosion of the coiled tube part of the water tank caused by the use of groundwater, thereby improving the service life of the main heat exchanger.

[0063] Since the main heat exchanger adopts a shell-less design, eliminating the need for a separate shell, the heat exchange tube 41 can be directly inserted into the tooling after the end plate is fixed during assembly, without needing to be placed in the heat exchanger shell, thus improving production efficiency.

[0064] In one embodiment of this application, a plurality of fins 44 are further provided on the heat exchange tube 41, and the fins 44 are located between two end plates 42.

[0065] Specifically, in the actual assembly process, for the heat exchange tube 41, multiple fins 44 can be set on the outside of the heat exchange tube 41 by tube expansion. The fins 44 and the heat exchange tube 41 have good heat conduction ability. After the tube expansion is completed on the heat exchange tube 41, it is assembled onto the two end plates 42.

[0066] By adding fins 44 to the heat exchange tube 41, the fins 44 are expanded and formed on the heat exchange tube 41 and are thermally connected to the heat exchange tube. The heat exchange area with the flue gas can be increased through the fins 44, thereby improving the overall heat exchange efficiency of the main heat exchanger 4.

[0067] In one embodiment of this application, the lower edge of the end plate 42 overlaps the side plate on the corresponding side, and the upper edge of the end plate 42 overlaps the lower edge of the smoke hood 5.

[0068] Specifically, during the actual assembly process, the upper and lower edges of the end plate 42 can be overlapped with the corresponding side plates and the smoke hood 5, and then the end plate 42 is connected to the side plates and the smoke hood 5 by screws.

[0069] By overlapping the end plate 42 with the side plate on the corresponding side of the combustion chamber 3, the lower end of the end plate 42 is fixedly installed. The end plate 42 and the side plate form an overlapping area to reduce the leakage of flue gas from the connection between the end plate 42 and the side plate, thereby improving the airtightness.

[0070] Similarly, the end plate 42 is connected to the lower edge of the corresponding side of the smoke hood 5 by overlapping, so as to fix the upper end of the end plate 42. The end plate 42 and the smoke hood 5 form an overlapping area to reduce the leakage of flue gas from the connection between the end plate 42 and the smoke hood 5, thereby improving the airtightness.

[0071] In one embodiment of this application, the extension 33 overlaps the lower edge of the smoke hood 5.

[0072] Specifically, the combustion chamber 3 and the smoke hood 5 are connected and fixed by the extension 33. Similarly, after the extension 33 overlaps with the smoke hood 5, the connection is tightened by screws.

[0073] By connecting the upper end of the extension 33 to the lower edge of the smoke hood 5, good fixation and sealing can be achieved around the main heat exchanger 4, thus eliminating the need for a separate housing for the main heat exchanger 4 and effectively simplifying the overall structure.

[0074] In one embodiment of this application, a heat insulation layer 34 is provided on the inner surface of the combustion chamber 3.

[0075] Specifically, the combustion gas from burner 2 produces high-temperature flue gas in combustion chamber 3, which radiates heat to the surrounding area of ​​combustion chamber 3. The insulation layer 34 protects the inner wall of combustion chamber 3, preventing heat transfer from combustion chamber 3 to the outside and causing overheating of outer shell 1. Furthermore, the insulation layer 34 reduces heat loss from the flue gas, thereby improving the heating efficiency of the flue gas on heat exchange tube 41 and enhancing energy utilization.

[0076] For gas-fired water heaters, a zero-cold-water pipe can be configured as needed. Therefore, for gas-fired water heaters with zero-cold-water function, a zero-cold-water pipe can also be installed on the outer casing 1, and the zero-cold-water pipe is also connected to the heat exchange pipe 41 through the preheating pipe.

[0077] Specifically, when the zero-cold water pipe is connected to the pipeline, the zero-cold water pipe is also connected to the heat exchange pipe 41 through the preheating pipe in the condenser heat exchanger 6 inside the outer shell 1, so that the water flowing in from the zero-cold water pipe is preheated through the preheating pipe before flowing into the heat exchange pipe 41.

[0078] By connecting the zero-cold-water pipe to the heat exchange pipe 41 through the preheating pipe, the waste heat of the flue gas can be fully utilized to heat water in the zero-cold-water mode.

[0079] In one embodiment of this application, the main heat exchanger 4 further includes a bypass pipe 43, which is connected between the two ends of the heat exchange tube 41.

[0080] Specifically, the bypass pipe 43 is welded between the two ends of the heat exchange pipe 41. For example, holes can be made in the pipe walls at both ends of the heat exchange pipe 41, and then the bypass pipe 43 is inserted into the corresponding holes for welding.

[0081] By connecting the two ends of the heat exchange tube through a bypass pipe 43, which has a small diameter, some cold water can be heated without passing through the flue gas in the combustion chamber 3, so as to more effectively regulate the water temperature.

[0082] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by the present invention.

Claims

1. A gas-fired hot water device, characterized in that, include: The outer casing has a smoke outlet pipe on its exterior. A burner for burning fuel gas; Combustion chamber, wherein a combustion cavity is formed; Main heat exchanger; A smoke collection hood, wherein a smoke exhaust port is provided on the smoke collection hood; A condensing heat exchanger includes a heat exchange chamber and a preheating tube. The heat exchange chamber is provided with a communication port and a flue pipe. The preheating tube is located in the heat exchange chamber, and a drain port is provided at the bottom of the heat exchange chamber. A fan configured to drive air into the combustion chamber and cause the flue gas generated in the combustion chamber to be discharged from the exhaust port; A drainage assembly includes a condensate collection tank, a water level sensor, a drain pipe, and a heating and pressurizing module. The heating and pressurizing module includes a gas tank, an electric heating element, a one-way valve, and an electrically controlled valve. The electric heating element is located on the gas tank, the one-way valve is located at the inlet of the gas tank, and the electrically controlled valve is located at the outlet of the gas tank. The condensate collection tank is provided with a condensate inlet, a condensate outlet, and a pressurizing air inlet. The water level sensor is arranged in the condensate collection tank. The drain pipe is connected to the condensate outlet, and the electrically controlled valve is connected to the pressurizing air inlet. The combustion chamber and the fan are housed within the outer casing. The burner is located within the combustion chamber, the main heat exchanger is positioned above the combustion chamber, the smoke hood covers the top of the main heat exchanger, the exhaust port is connected to the connecting port, the exhaust pipe is connected to the smoke outlet pipe, the drain port is connected to the condensate inlet, the drain pipe extends into the smoke outlet pipe, the one-way valve is connected to the air outlet side of the fan via a gas pipe, and the fan is also configured to pressurize and input a portion of the air into the gas tank via the one-way valve so that a certain amount of pressurized gas is stored in the gas tank.

2. The gas-fired hot water equipment according to claim 1, characterized in that, The electric heating component is a thick film wrapped around the outside of the gas tank; or, the electric heating component is an electric heating tube inserted into the gas tank.

3. The gas-fired hot water equipment according to claim 1, characterized in that, The gas tank is also equipped with a pressure sensor, which is configured to trigger the electric heating component to turn off the power; the water level sensor is configured to trigger the electric heating component to turn on the power.

4. The gas-fired hot water equipment according to claim 1, characterized in that, The condensate collection tank is equipped with an overflow plate, which divides the interior of the condensate collection tank into a first cavity and a second cavity. The condensate inlet is located at the top of the condensate collection tank and connects to the first cavity, and the condensate outlet is located at the bottom of the condensate collection tank and connects to the second cavity.

5. The gas-fired hot water equipment according to claim 4, characterized in that, An overflow port is formed between the overflow plate and the top of the condensate collection tank; a one-way valve plate is provided in the condensate collection tank, the top of the one-way valve plate is rotatably disposed in the condensate collection tank and located above the overflow plate, and the one-way valve plate is configured to overlap the overflow plate after pressurized gas is injected into the second cavity to close the overflow port.

6. The gas-fired hot water equipment according to any one of claims 1-5, characterized in that, The main heat exchanger includes heat exchange tubes and two end plates, the two end plates are arranged opposite to each other, and the heat exchange tubes pass through the two end plates; The front and rear panels of the combustion chamber are provided with upwardly extending extensions, and an installation area is formed between the two extensions. The main heat exchanger is located in the installation area, the extension is connected to the lower edge of the smoke hood, and the end plate is connected between the side plates of the smoke hood and the corresponding side of the combustion chamber.

7. The gas-fired hot water equipment according to claim 6, characterized in that, The condenser heat exchanger is arranged on one side of the smoke hood.

8. The gas-fired hot water equipment according to claim 7, characterized in that, The smoke vent is provided on the side of the smoke collection hood, and the smoke vent is connected to the connecting port through a horizontally arranged flue.

9. The gas-fired hot water equipment according to claim 6, characterized in that, The lower edge of the end plate overlaps the corresponding side plate, and the upper edge of the end plate overlaps the lower edge of the smoke hood.

10. The gas-fired hot water equipment according to claim 6, characterized in that, The extension overlaps the lower edge of the smoke hood.

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