Dual-purpose gas water heater for heating and living

Abstract

The utility model provides a kind of dual-purpose gas water heater of heating life, it is related to water heater technical field, including outer circulation casing, outer circulation casing inside is provided with gas assembly, heat exchanger and combustion heat insulating chamber, heat exchanger is set in the upper of gas assembly, combustion heat insulating chamber is set between gas assembly and heat exchanger, heat exchanger upper still is provided with inner circulation casing, inner circulation casing connects fan.The utility model's advantage is, hot air in inner circulation cavity is extracted quickly using fan, make fresh gas in outer circulation cavity rapidly surge into combustion heat insulating chamber, greatly promote the full combustion of gas, combustion heat insulating chamber is designed using the combination of heat insulation wallboard, heat insulation layer and air layer, effectively reduce heat loss, improve energy utilization efficiency, the combination of both makes heat exchanger can be heated quickly, and gas can be fully combusted, so not only guarantee the high efficiency and safety of use, but also can give full play to the advantage of energy.

Description

Technical Field

[0001] The utility model relates to the field of water heater technology, and in particular to a gas water heater that can be used for both heating and domestic purposes. Background Technology

[0002] The combustion chamber of a gas water heater, as one of its core components, plays a crucial role in the operation of the entire device. A well-designed combustion chamber can effectively promote the thorough mixing of gas and air. This thorough mixing creates ideal conditions for complete combustion of the gas, allowing the chemical energy in the gas to be converted into heat energy more efficiently, thereby significantly improving energy utilization and avoiding unnecessary energy waste.

[0003] In terms of safety performance, a well-designed combustion chamber ensures a stable and safe combustion process. It effectively prevents dangerous situations such as backfire and deflagration, which could damage the gas water heater and seriously threaten the lives and property of users. Simultaneously, the combustion chamber has the ability to efficiently remove harmful gases produced during combustion, such as carbon monoxide. Carbon monoxide is a colorless and odorless toxic gas; if not removed promptly, it will accumulate indoors, leading to poisoning and even death. Therefore, timely and effective removal of these harmful gases is crucial for ensuring user safety.

[0004] To achieve the above functions, the combustion chamber needs to be able to quickly remove heat and exhaust gases. Only in this way can the temperature and pressure inside the combustion chamber be kept within a safe and stable range, avoiding various problems caused by the accumulation of heat and exhaust gases. At the same time, the heat generated by gas combustion needs to be fully utilized by the gas water heater, transferring the heat to the water in the pipes through a heat exchanger, heating the cold water into hot water that meets the user's needs.

[0005] The technical content disclosed in Chinese patent document (publication number: CN218722317U, patent name: gas water heater) is as follows: The gas water heater includes a cooling component, which includes an external pipe and a radiator; one end of the external pipe is connected to the combustion fan of the gas water heater, and the other end is connected to the radiator, which is disposed on the outer surface of the burner of the gas water heater. In this gas water heater, the airflow from the combustion fan achieves active cooling of the burner, allowing the surface of the combustion fan to cool down even without external airflow, thus preventing over-combustion and ensuring the safe use of the gas water heater.

[0006] As can be seen from the above implementation plan and corresponding drawings, the design of this gas water heater has certain limitations. Although it uses a fan to blow air onto the radiator to achieve rapid cooling, it fails to effectively solve the crucial problem of quickly removing the exhaust gases generated in the combustion chamber. The accumulation of exhaust gases in the combustion chamber not only affects combustion efficiency but also increases the risk of harmful gas leaks, posing a potential threat to the health and safety of users. Utility Model Content

[0007] This utility model overcomes the shortcomings of existing technologies and provides a dual-purpose gas water heater for heating and domestic use. It utilizes a fan to rapidly extract hot air from the inner circulation chamber, creating a pressure difference between the inner and outer circulation chambers. This causes fresh gas from the outer circulation chamber to quickly flow into the combustion insulation chamber, where it mixes thoroughly with the gas, greatly promoting complete combustion. The combustion insulation chamber employs a combination design of insulation panels, insulation layers, and air layers, effectively reducing heat loss, improving energy efficiency, and lowering operating costs. This combination allows for rapid heating of the heat exchanger and complete combustion of the gas, thus ensuring not only high efficiency and safety but also fully leveraging the advantages of energy by completely converting gas into heat energy for use.

[0008] To solve the above-mentioned technical problems, the utility model is implemented through the following technical solution:

[0009] A gas water heater for both heating and domestic use includes an external circulation shell, inside which a gas component, a heat exchanger, and a combustion insulation chamber are arranged. The heat exchanger is arranged above the gas component, and the combustion insulation chamber is arranged between the gas component and the heat exchanger. An internal circulation shell is also arranged above the heat exchanger, and the internal circulation shell is connected to a fan.

[0010] The gas assembly includes a gas valve and a burner. The gas valve is connected to the natural gas supply burner for combustion, and the combustion insulation chamber provides a relatively enclosed space for the mixed combustion of gas and air.

[0011] The heat exchanger includes a water pipe and a heating element. One end of the water pipe is connected to a water pump, which is used to pump water into the water pipe. The other end of the water pipe is connected to a water outlet valve, which is used to output the water that has been heated by the water pipe.

[0012] The water pumps include a domestic water pump and a heating water pump. The outlet valves include a domestic hot water outlet and a heating water supply outlet. The domestic water pump is ultimately connected to the domestic hot water outlet, and the heating water pump is ultimately connected to the heating water supply outlet.

[0013] Furthermore, the vertical internal space formed by the gas assembly, combustion insulation chamber, heat exchanger, and inner circulation shell is the inner circulation cavity, while the space formed by the exterior of the gas assembly, combustion insulation chamber, heat exchanger, and inner circulation shell and the interior of the outer circulation shell is the outer circulation cavity.

[0014] The fan extracts the hot air from the inner circulation chamber, allowing the gas in the outer circulation chamber to quickly enter the combustion insulation chamber and promote combustion of the fuel gas.

[0015] Furthermore, the top of the external circulation housing is provided with a top plate; the top plate is provided with a gas inlet, and the air outlet of the fan is inserted into the gas inlet. The air outlet of the fan is smaller than the gas inlet, so an air inlet channel is formed between the air outlet of the fan and the gas inlet.

[0016] The fan draws hot air out of the internal circulation chamber and discharges it from the fan outlet. External air enters the external circulation chamber through the air inlet channel and enters the internal circulation chamber from below the gas assembly.

[0017] Furthermore, the external circulation housing includes a back plate, with side plates connected to both sides of the back plate and a lower partition plate connected to the middle of the back plate. The partition plate isolates the gas assembly, combustion insulation chamber, heat exchanger, internal circulation housing, and other control components of the water heater.

[0018] Furthermore, the combustion insulation chamber is surrounded by partition components, and the heat exchanger is located within the space surrounded by the partition components. The partition components include insulation wall panels and insulation layers, and an air layer is provided between the insulation wall panels and the insulation layers.

[0019] The heat insulation wall panel is provided with convex round blocks that protrude towards the heat insulation layer, with the top of the convex round blocks abutting against the heat insulation layer.

[0020] Furthermore, a front panel and an operation panel are also provided in front of the back panel, and the operation panel is used to install operation control buttons;

[0021] An inner reinforcing plate is also provided on the inner side of the front panel.

[0022] Furthermore, the heat exchanger includes water pipes and heating elements;

[0023] The heating element is provided in a plurality of parts, with a gap between each pair of heating elements;

[0024] The water pipe is inserted into the heating element, and the water pipe connects several heating elements together in series.

[0025] Furthermore, an expansion tank is provided on the side of the heat exchanger, and the expansion tank is connected to a water pipe.

[0026] Furthermore, an airflow regulating device is provided between the external circulation cavity and the internal circulation cavity. The airflow regulating device includes an adjustable baffle and a drive mechanism. The drive mechanism can control the opening and closing angle of the baffle according to the operating status and temperature feedback of the gas water heater, so as to adjust the gas flow rate and velocity entering the internal circulation cavity from the external circulation cavity, thereby further optimizing the combustion efficiency and heat dissipation effect.

[0027] Furthermore, the fan is a variable speed fan, whose speed can be automatically adjusted according to the load demand of the gas water heater and the temperature change of the heat exchanger. When the gas water heater is operating under high load or the heat exchanger temperature is too high, the fan speed increases to enhance the hot air extraction capacity of the inner circulation cavity and the gas replenishment capacity of the outer circulation cavity; when the gas water heater is operating under low load or the heat exchanger temperature is low, the fan speed decreases to save energy and reduce noise.

[0028] Compared with existing technologies, the advantages of this utility model are:

[0029] A fan rapidly extracts hot air from the internal circulation chamber, creating a pressure difference between the inner and outer circulation chambers. This causes fresh gas from the outer circulation chamber to quickly flow into the combustion insulation chamber, mixing thoroughly with the fuel gas. This greatly promotes complete combustion and prevents incomplete combustion and the generation of toxic gases such as carbon monoxide due to insufficient air intake. The combustion insulation chamber employs a combination of insulation panels, insulation layers, and air layers, effectively reducing heat loss, improving energy efficiency, and lowering operating costs. This combination allows the heat exchanger to be heated quickly and the gas to be fully combusted. Therefore, it not only ensures high efficiency and safety but also fully utilizes the advantages of energy, completely converting fuel gas into heat energy for use. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate the utility model and, together with the embodiments of the utility model, are used to explain the utility model. They do not constitute a limitation on the utility model. In the drawings:

[0031] Figure 1 This is a schematic diagram of the overall structure of the water heater according to an embodiment of the present utility model;

[0032] Figure 2 This is a schematic diagram of the first explosion of a water heater according to an embodiment of this utility model;

[0033] Figure 3 This is a schematic diagram of the internal structure of the water heater according to an embodiment of the present utility model;

[0034] Figure 4 This is a second exploded schematic diagram of the water heater according to an embodiment of the present utility model;

[0035] Figure 5This is a third explosion diagram of the water heater according to an embodiment of the present utility model;

[0036] In the diagram: 1. Fan; 2. Inner circulation shell; 3. Heat exchanger; 301. Water pipe; 302. Heating element; 303. Water pump; 304. Water outlet valve; 4. Gas assembly; 401. Gas valve; 402. Burner; 5. Combustion insulation chamber; 501. Insulation wall panel; 502. Insulation layer; 6. Outer circulation shell; 601. Back panel; 602. Side panel; 603. Top panel; 6031. Gas inlet; 604. Lower partition; 605. Front panel; 6051. Inner reinforcing plate; 606. Control panel; 7. Expansion tank. Detailed Implementation

[0037] The preferred embodiments of the utility model are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the utility model.

[0038] like Figures 1 to 5 As shown, a dual-purpose gas water heater for heating and domestic use includes an external circulation shell 6. Inside the external circulation shell 6 are a gas assembly 4, a heat exchanger 3, and a combustion insulation chamber 5. The heat exchanger 3 is positioned above the gas assembly 4, and the combustion insulation chamber 5 is located between the gas assembly 4 and the heat exchanger 3. An internal circulation shell 2 is also positioned above the heat exchanger 3, and the internal circulation shell 2 is connected to a fan 1. The gas assembly 4 is used to connect gas and is equipped with a burner to ignite the gas. The combustion insulation chamber 5 provides a relatively sealed space for the combustion of the gas assembly 4 during the combustion process. In the process, the flame temperature can soar to 800-1000℃, which can efficiently convert the chemical energy contained in the gas into heat energy. The heat exchanger 3 includes a water pipe 301 and a heating element 302. The heating element 302 heats the water in the water pipe 301 by rapidly heating the water with the heat energy generated by the combustion of the gas. In order to ensure combustion efficiency, the combustion insulation chamber 5 needs to maintain a sufficient air intake. If the air intake is insufficient, the air density will decrease, which will lead to incomplete combustion and increase the generation of toxic gases such as carbon monoxide. This will not only affect the energy utilization efficiency, but also pose a potential threat to the health of users.

[0039] The heat exchanger 3 includes a water pipe 301 and a heating element 302. One end of the water pipe 301 is connected to a water pump 303, which is responsible for drawing cold water into the water pipe 301. The other end of the water pipe 301 is connected to a water outlet valve 304, and the heated hot water is output through the water outlet valve 304. The water pump 303 includes a domestic water pump and a heating water pump. The water outlet valve 304 includes a domestic hot water outlet and a heating water supply outlet. The domestic water pump is finally connected to the domestic hot water outlet, and the heating water pump is finally connected to the heating water supply outlet. Therefore, this water heater can be used to heat domestic hot water and heating water, providing dual functionality and solving the problem of hot water supply for households.

[0040] The vertical internal space formed by the gas assembly 4, the combustion insulation chamber 5, the heat exchanger 3, and the inner circulation shell 2 is the inner circulation cavity, while the space formed by the exterior of the gas assembly 4, the combustion insulation chamber 5, the heat exchanger 3, the inner circulation shell 2, and the interior of the outer circulation shell 6 is the outer circulation cavity.

[0041] During the operation of the entire heat dissipation structure, the fan 1 plays a crucial role. It can quickly extract hot air from the inner circulation chamber, creating a significant pressure difference between the inner and outer circulation chambers, which in turn causes the gas in the outer circulation chamber to rush into the combustion insulation chamber 5. This fresh gas mixes thoroughly with the fuel gas, greatly promoting complete combustion.

[0042] Fan 1 extracts hot air from the inner circulation chamber, allowing gas from the outer circulation chamber to quickly enter the combustion insulation chamber 5 and promote combustion. Therefore, compared to traditional structures using ductwork for ventilation, this innovative method of using both inner and outer circulation chambers for air exchange in the combustion insulation chamber 5 offers several significant advantages. Firstly, it significantly increases airflow and accelerates the air exchange rate, enabling more complete combustion of the gas inside the combustion insulation chamber 5 while promptly and quickly removing exhaust gases. Secondly, during the air exchange process, it effectively removes excess heat generated during combustion, preventing a series of problems caused by heat accumulation. For example, it prevents accelerated aging of metal components such as burners and heat exchangers due to thermal fatigue, avoiding deformation and cracking, thereby extending the service life of these critical components.

[0043] Furthermore, the air exchange method using both internal and external circulation chambers cleverly avoids the blockage problems that can occur with traditional pipes. This not only improves the stability and reliability of the gas water heater's operation but also significantly reduces the difficulty, cost, and time of maintenance, providing users with a more convenient and efficient user experience.

[0044] The combustion insulation chamber 5 is surrounded by partition components. The heat exchanger 3 is located within the space surrounded by the partition components. The partition components include insulation wall panels 501 and insulation layers 502. An air layer is also provided between the insulation wall panels 501 and the insulation layers 502. In this embodiment, the main components of the insulation layers 502 are natural minerals such as asbestos and slag, which have good thermal insulation performance. The materials are not only lightweight, easy to construct and maintain, but also relatively low in cost.

[0045] Because an air layer is provided between the heat insulation panel 501 and the heat insulation layer 502, the presence of the air layer further enhances the heat insulation effect. It acts like a natural heat insulation barrier, effectively preventing the transfer of heat.

[0046] The heat insulation wall panel 501 is provided with a convex round block that protrudes towards the heat insulation layer 502. The top of the convex round block abuts against the heat insulation layer 502. This design not only makes the connection between the heat insulation wall panel 501 and the heat insulation layer 502 more stable, but also enhances the rigidity of the heat insulation wall panel 501, preventing it from denting due to pressure during long-term use.

[0047] The top of the external circulation housing 6 is provided with a top plate 603; the top plate 603 is provided with a gas inlet 6031, and the air outlet of the fan 1 is inserted into the gas inlet 6031. The air outlet of the fan 1 is smaller than the gas inlet 6031, thus forming an air inlet channel between the air outlet of the fan 1 and the gas inlet 6031. The fan 1 draws out the hot air from the internal circulation chamber and discharges it from the air outlet of the fan 1. External air enters the external circulation chamber from the air inlet channel and enters the internal circulation chamber from below the gas assembly 4. During the operation of the entire heat dissipation system, the fan 1 plays a key role, forcefully drawing out the hot air in the internal circulation chamber and discharging it from the air outlet. At this time, fresh external air will quickly enter the external circulation chamber along the air inlet channel, and then smoothly enter the internal circulation chamber from below the gas assembly 4, providing sufficient air for combustion and heat dissipation.

[0048] The external circulation housing 6 includes a back plate 601, with side plates 602 connected to both sides of the back plate 601 and a lower partition 604 connected to the middle of the back plate 601. The lower partition 604 plays an important role in isolation, effectively separating the gas assembly 4, combustion insulation chamber 5, heat exchanger 3, internal circulation housing 2 from other control components of the water heater, avoiding mutual interference between different components and ensuring the stable operation of the water heater.

[0049] The front panel 605 and the control panel 606 are also provided in front of the back panel 601. The control panel 606 is an important interface for users to interact with the water heater. Various operation and control buttons are installed on it, so that users can operate and adjust the water heater according to their actual needs. The inner side of the front panel 605 is also provided with an inner reinforcing plate 6051. The inner reinforcing plate 6051 strengthens the front panel 605, making the outer shell of the water heater more robust and stable.

[0050] The heat exchanger 3 is the core component of the water heater for heat conversion. It consists of water pipes 301 and several heating elements 302. Gaps are intentionally placed between the heating elements 302. This design not only increases airflow and improves heat exchange efficiency but also effectively prevents heat buildup. The water pipes 301 are cleverly inserted into the heating elements 302, connecting several heating elements 302 in series, allowing hot water to flow smoothly through the pipes and fully absorb the heat transferred by the heating elements.

[0051] An expansion tank 7 is installed on the side of the heat exchanger 3. The expansion tank 7 is connected to the water pipe 301. The expansion tank 7 plays a crucial role. During the operation of the water heater, the water in the pipes expands due to temperature changes. The expansion tank 7 can accommodate this expansion, preventing damage to the pipes due to excessive internal pressure and ensuring the safe and stable operation of the water system. Simultaneously, it also maintains a constant system pressure, keeping the pressure of the entire hot water circulation system within a stable range to ensure a normal supply of hot water. Furthermore, when the system needs water replenishment, the expansion tank can promptly provide a water source to maintain the system's normal water level.

[0052] An airflow regulating device is installed between the external circulation chamber and the internal circulation chamber. The airflow regulating device includes an adjustable baffle and a drive mechanism. The drive mechanism can control the opening and closing angle of the baffle according to the operating status and temperature feedback of the gas water heater, so as to adjust the gas flow rate and velocity entering the internal circulation chamber from the external circulation chamber, further optimize the combustion efficiency and heat dissipation effect, and make the combustion process more complete and the heat dissipation more efficient.

[0053] Fan 1 is a variable-speed fan, whose speed can be automatically adjusted according to the load demand of the gas water heater and the temperature changes of the heat exchanger 3. When the gas water heater is operating under high load or the temperature of the heat exchanger 3 is too high, fan 1 increases its speed to enhance the hot air extraction capacity of the inner circulation chamber and the gas replenishment capacity of the outer circulation chamber, ensuring that the system can dissipate heat in a timely manner and maintain normal operation. When the gas water heater is operating under low load or the temperature of the heat exchanger 3 is low, fan 1 reduces its speed, which saves energy and reduces noise generated during operation, providing users with a quiet and comfortable operating environment.

[0054] A fan 1 is installed to extract hot air from the internal circulation chamber, allowing gas from the external circulation chamber to quickly enter the combustion insulation chamber 5, where it mixes thoroughly with the fuel gas. This promotes complete combustion and prevents incomplete combustion and the generation of toxic gases such as carbon monoxide due to insufficient air intake. The fan 1 increases airflow and ventilation speed: by utilizing the internal and external circulation chambers for ventilation, compared to traditional duct ventilation structures, it can significantly increase airflow and accelerate ventilation speed, resulting in more complete combustion, timely removal of combustion exhaust gas, and removal of excess heat during ventilation. This prevents heat accumulation and avoids accelerated aging, deformation, and cracking of metal components such as burners and heat exchangers due to thermal fatigue, thus extending the service life of critical components.

[0055] By using internal and external circulation chambers for air exchange, the problem of blockage in traditional pipes is avoided, improving the operational stability and reliability of gas water heaters, reducing maintenance difficulty, costs, and time.

[0056] This water heater utilizes a fan to rapidly extract hot air from the internal circulation chamber, creating a pressure difference between the inner and outer circulation chambers. This causes fresh gas from the outer circulation chamber to quickly flow into the combustion insulation chamber, where it mixes thoroughly with the gas, greatly promoting complete combustion and preventing incomplete combustion and the generation of toxic gases such as carbon monoxide due to insufficient air intake. The combustion insulation chamber employs a combination design of insulation panels, insulation layers, and air layers, effectively reducing heat loss, improving energy efficiency, and lowering operating costs. This combination ensures both rapid heating of the heat exchanger and complete combustion of the gas, thus guaranteeing high efficiency and safety while fully leveraging the advantages of energy, completely converting gas into heat energy for use.

[0057] Finally, it should be noted that the above are merely preferred embodiments of the utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the 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. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the utility model should be included within the protection scope of the utility model.

Claims

1. A gas-fired water heater for both heating and domestic use, characterized in that, It includes an outer circulation shell (6), inside which a gas assembly (4), a heat exchanger (3) and a combustion insulation chamber (5) are installed. The heat exchanger (3) is located above the gas assembly (4), and a combustion insulation chamber (5) is provided between the gas assembly (4) and the heat exchanger (3). An inner circulation shell (2) is also provided above the heat exchanger (3), and the inner circulation shell (2) is connected to a fan (1). The gas assembly (4) includes a gas valve (401) and a burner (402). The gas valve (401) is connected to the natural gas supply burner (402) for combustion. The combustion insulation chamber (5) provides a relatively enclosed space for the mixed combustion of gas and air. The heat exchanger (3) includes a water pipe (301) and a heating element (302). One end of the water pipe (301) is connected to a water pump (303), which is used to pump water into the water pipe (301). The other end of the water pipe (301) is connected to a water outlet valve (304), which is used to output water heated by the water pipe (301). The water pump (303) includes a domestic water pump and a heating water pump, and the outlet valve (304) includes a domestic hot water outlet and a heating water supply outlet. The domestic water pump is ultimately connected to the domestic hot water outlet, and the heating water pump is ultimately connected to the heating water supply outlet.

2. The dual-purpose gas water heater for heating and domestic use according to claim 1, characterized in that, The vertical internal space formed by the gas assembly (4), combustion insulation chamber (5), heat exchanger (3) and inner circulation shell (2) is the inner circulation cavity, while the space formed by the exterior of the gas assembly (4), combustion insulation chamber (5), heat exchanger (3), inner circulation shell (2) and the interior of the outer circulation shell (6) is the outer circulation cavity. The fan (1) extracts the hot air from the inner circulation chamber, allowing the gas in the outer circulation chamber to quickly enter the combustion insulation chamber (5) and promote combustion of the gas.

3. The dual-purpose gas water heater for heating and domestic use according to claim 2, characterized in that, The top of the external circulation housing (6) is provided with a top plate (603); the top plate (603) is provided with a gas inlet (6031), the air outlet of the fan (1) is connected to the gas inlet (6031), the air outlet of the fan (1) is smaller than the gas inlet (6031), so an air inlet channel is formed between the air outlet of the fan (1) and the gas inlet (6031); The blower (1) draws out the hot air from the inner circulation chamber and discharges it from the outlet of the blower (1). The external air enters the outer circulation chamber from the air inlet channel and enters the inner circulation chamber from below the gas assembly (4).

4. The dual-purpose gas water heater for heating and domestic use according to claim 3, characterized in that, The external circulation housing (6) includes a back plate (601), with side plates (602) connected to both sides of the back plate (601) and a lower partition (604) connected to the middle of the back plate (601). The partition (604) isolates the gas assembly (4), combustion insulation chamber (5), heat exchanger (3), internal circulation housing (2) from other control components of the water heater.

5. The dual-purpose gas water heater for heating and domestic use according to any one of claims 1 to 4, characterized in that, The combustion insulation chamber (5) is surrounded by partition components. The heat exchanger (3) is located within the space surrounded by the partition components. The partition components include insulation wall panels (501) and insulation layers (502). An air layer is also provided between the insulation wall panels (501) and the insulation layers (502). The heat insulation wall panel (501) is provided with a convex round block, which protrudes towards the heat insulation layer (502), and the top of the convex round block abuts against the heat insulation layer (502).

6. The dual-purpose gas water heater for heating and domestic use according to claim 4, characterized in that, The back panel (601) is also provided with a front panel (605) and an operation panel (606) in front of it. The operation panel (606) is used to install operation control buttons. An inner reinforcing plate (6051) is also provided on the inner side of the front panel (605).

7. The dual-purpose gas water heater for heating and domestic use according to claim 5, characterized in that, The heat exchanger (3) includes a water pipe (301) and a heating element (302); The heating element (302) is provided in a plurality of units, and a gap is provided between every two heating elements (302); The water pipe (301) is inserted into the heating element (302), and the water pipe (301) connects several heating elements (302) together.

8. The dual-purpose gas water heater for heating and domestic use according to claim 7, characterized in that, An expansion tank (7) is provided on the side of the heat exchanger (3), and the expansion tank (7) is connected to the water pipe (301).

9. The dual-purpose gas water heater for heating and domestic use according to any one of claims 1 to 4 and 6 to 8, characterized in that, An airflow regulating device is provided between the external circulation cavity and the internal circulation cavity. The airflow regulating device includes an adjustable baffle and a drive mechanism. The drive mechanism can control the opening and closing angle of the baffle according to the operating status and temperature feedback of the gas water heater, so as to adjust the gas flow rate and velocity entering the internal circulation cavity from the external circulation cavity, and further optimize the combustion efficiency and heat dissipation effect.

10. The dual-purpose gas water heater for heating and domestic use according to any one of claims 1 to 4 and 6 to 8, characterized in that, The fan (1) is a variable speed fan, whose speed can be automatically adjusted according to the load demand of the gas water heater and the temperature change of the heat exchanger (3). When the gas water heater is operating under high load or the temperature of the heat exchanger (3) is too high, the fan (1) increases its speed to enhance the hot air extraction capacity of the inner circulation cavity and the gas replenishment capacity of the outer circulation cavity. When the gas water heater is operating under low load or the temperature of the heat exchanger (3) is low, the fan (1) reduces its speed to save energy and reduce noise.

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