Gas inlet device and gas water heating equipment
By installing a flow regulating component at the blower outlet and adjusting the angle of the rotatable part to adjust the airflow, the problem of excessive combustion load in gas-fired water heaters under low heat demand is solved, achieving stable operation and efficient combustion, improving user experience and equipment lifespan.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-10
AI Technical Summary
Existing gas-fired water heaters have a high combustion load when hot water demand is low, resulting in higher outlet water temperature, which affects user experience and cannot be effectively adjusted to meet different hot water needs.
A flow regulating component, including an installation part and a flip-up part, is installed at the air outlet of the fan. The airflow is adjusted by adjusting the angle of the flip-up part, thereby achieving dynamic adjustment of the combustion load. This ensures that the combustion load is reduced when the heat demand is low and restored to normal combustion load when the heat demand is high.
It enables stable operation of gas-fired water heaters under low heat demand, avoids frequent start-stop cycles, extends equipment life, improves user experience and combustion efficiency, and reduces energy waste.
Smart Images
Figure CN223985369U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of hot water supply equipment, and in particular to an air intake device and a gas-fired hot water equipment. Background Technology
[0002] To enable fully premixed gas-fired water heaters to dynamically adjust their output power, a common approach is to connect the air outlet of the water heater's inlet device to the burner's inlet. An air-fuel proportional valve is installed within the inlet device. By changing the fan speed, the negative pressure downstream of the proportional valve is adjusted, thereby regulating the gas-air mixture flow rate at the inlet outlet and ultimately controlling the combustion load. Specifically, fan speed is positively correlated with the generated negative pressure; higher speed results in greater negative pressure and a wider opening of the proportional valve, allowing more gas to pass through and increasing the combustion load. Conversely, lower fan speed reduces negative pressure, decreases the proportional valve opening, and consequently reduces the combustion load.
[0003] However, since the fan speed cannot be reduced indefinitely, when faced with scenarios where the demand for hot water output temperature is low, such as taking a shower in summer, the combustion load of the gas water heater cannot be reduced to a level that is suitable for it. This will result in the hot water output temperature of the gas water heater being too high, affecting the user experience. Utility Model Content
[0004] The first technical problem solved by this utility model is to provide an air intake device that effectively solves the problem that the minimum combustion load of existing gas-fired water heaters is too large, making them unsuitable for the demand for low hot water outlet temperature.
[0005] The second technical problem solved by this utility model is to provide a gas-fired water heater that effectively solves the problem that the minimum combustion load of existing gas-fired water heaters is too large, making them unsuitable for the demand for low hot water outlet temperature.
[0006] The first technical problem mentioned above is solved by the following technical solution:
[0007] An air intake device for a gas-fired water heater, comprising:
[0008] The fan has an air outlet;
[0009] A flow regulating component includes a mounting part and a rotatable part; the mounting part is installed on the outside of the air outlet, and the rotatable part covers the air outlet; the rotatable part is rotatably connected to the mounting part to regulate the airflow rate of the air outlet.
[0010] Compared with the prior art, the air intake device of this utility model has the following advantages: Taking its application in a gas-fired water heater as an example, the gas and air mixture enters through the premixer from the air inlet of the fan. By setting a flow regulating component at the air outlet of the fan, this utility model can adjust the flow rate of the gas and air mixture through the air outlet, thereby adjusting the combustion load of the gas-fired water heater. Specifically, when the fan operates at its lowest or lower speed, the rotatable part will rotate slightly around the mounting part under the force of the airflow, so that the air outlet of the fan is not fully open. At this time, since the rotatable part is located on the flow path of the airflow, it not only increases the flow resistance of the airflow but also reduces the airflow rate through the air outlet of the fan. In this way, at the same fan speed, the combustion load of the gas-fired water heater can be reduced, allowing the gas-fired water heater to better meet the user's demand for lower hot water temperature. As the fan gradually increases its speed and operates at its maximum speed, the rotatable part, under the influence of airflow, increases its rotation angle around the mounting part until the fan outlet is fully opened. At this point, the resistance to airflow through the fan outlet is minimized, and the gas-air mixture flows smoothly, allowing the combustion load of the gas water heater to return to normal levels and meeting the user's demand for hot water temperature in high-heat scenarios. Furthermore, this invention mounts the mounting part on the outside of the fan outlet, reducing the difficulty of disassembly and assembly and improving ease of installation and removal.
[0011] In one embodiment, the mounting portion is provided with a vent opposite to the air outlet, and the rotatable portion is rotatably connected to the inner wall periphery of the vent.
[0012] In one embodiment, along the thickness direction of the mounting portion, the orthogonal projections of the rotatable portion and the air outlet toward the ventilation opening both fall into the ventilation opening.
[0013] In one embodiment, the rotatable portion completely covers and abuts the outer periphery of the air outlet.
[0014] In one embodiment, a gap is left between the side of the rotatable portion and the corresponding side of the vent.
[0015] In one embodiment, the mounting part is provided with a plurality of mounting holes located around the vent, and the mounting part is connected to the fan by fasteners passing through the mounting holes.
[0016] In one embodiment, the mounting portion and the reversible portion are integrally formed; the mounting portion and the reversible portion are made of an elastic, high-temperature resistant material.
[0017] The second technical problem mentioned above is solved by the following technical solution:
[0018] A gas-fired water heater, comprising:
[0019] Combustion chamber;
[0020] In the aforementioned air intake device, the air outlet of the fan is connected to the combustion chamber via an air intake pipe; the flow regulating component is installed at the connection between the air outlet and the air intake pipe.
[0021] Compared with the prior art, the gas-fired water heater of this utility model has the following advantages: Compared with existing gas-fired water heaters, the gas-fired water heater equipped with the above-mentioned air intake device can operate continuously with a lower combustion load for a longer period of time when users demand lower hot water temperatures. This avoids the frequent start-ups and shutdowns caused by gas-fired water heaters using high power to achieve lower temperatures, reducing mechanical wear and extending service life. Furthermore, because the gas-fired water heater can operate continuously with lower power, it not only avoids sudden changes in water temperature, ensuring stable water temperature and improving the user experience, but also reduces gas consumption, improves combustion efficiency, and reduces energy waste.
[0022] In one embodiment, both the outlet end of the fan and the inlet end of the inlet pipe are provided with annular flanges, and the mounting part is located between a pair of annular flanges and is detachably connected to the pair of annular flanges.
[0023] In one embodiment, the mounting portion and the pair of annular flanges are provided with coaxial and communicating mounting holes, and the mounting portion is connected to the pair of annular flanges by fasteners passing through the mounting holes. Attached Figure Description
[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0025] Figure 1 This is a schematic diagram of the structure of an air intake device according to an embodiment of the present utility model;
[0026] Figure 2 for Figure 1 A schematic diagram of the flow regulator shown in another state;
[0027] Figure 3 for Figure 1 An exploded view of the fan and flow regulator of the air intake device shown.
[0028] Figure 4 This is a structural schematic diagram of a gas-fired water heater according to an embodiment of the present utility model.
[0029] Explanation of reference numerals in the attached figures:
[0030] 1. Fan; 101. Air outlet; 102. Annular flange; 2. Flow regulating component; 201. Mounting part; 2011. Ventilation opening; 2012. Mounting hole; 202. Rotatable part; 3. Combustion chamber; 4. Air intake pipe; 5. Air intake duct; 501. Air inlet; 502. Pressure tap; 6. Pressure tapping pipe; 7. Premixer; 8. Gas proportional valve; 9. Gas intake pipe; 10. Gas inlet. Detailed Implementation
[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0032] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0033] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0034] The following is combined with Figures 1 to 4 The following describes embodiments of the present invention.
[0035] According to embodiments of the present invention, on the one hand, such as Figures 1 to 3 As shown, an air intake device is provided for a gas-fired water heater, including: a fan 1 and a flow regulator 2.
[0036] Specifically, the fan 1 has an air outlet 101; the flow regulating component 2 includes a mounting part 201 and a rotatable part 202; the mounting part 201 is mounted on the outside of the air outlet 101, and the rotatable part 202 covers the air outlet 101. The rotatable part 202 is rotatably connected to the mounting part 201 to regulate the airflow of the air outlet 101.
[0037] Taking its application in a gas-fired water heater as an example, the gas and air mixture enters through the inlet of the fan 1 via a premixer. In this embodiment, by setting a flow regulator 2 at the outlet 101 of the fan 1, the flow rate of the gas and air mixture through the outlet 101 can be adjusted, thereby achieving the purpose of adjusting the combustion load of the gas-fired water heater. Specifically, when the fan 1 operates at its lowest or lower speed, the reversible part 202 will rotate slightly around the mounting part 201 under the force of the airflow, so that the outlet 101 of the fan 1 is not fully open. At this time, since the reversible part 202 is located on the flow path of the airflow, it not only increases the flow resistance of the airflow but also reduces the flow rate of the airflow through the outlet 101 of the fan. In this way, the combustion load of the gas-fired water heater can be reduced at the same fan 1 speed, allowing the gas-fired water heater to better meet the user's demand for lower hot water outlet temperature. As the fan 1 gradually increases its speed and operates at its maximum speed, the rotatable part 202 will increase its rotation angle around the mounting part 201 under the action of airflow until the air outlet 101 of the fan 1 is fully opened. At this time, the resistance of the airflow through the air outlet 101 of the fan 1 is minimized, and the gas-air mixture flows smoothly, allowing the combustion load of the gas water heater to return to its original normal level, meeting the user's hot water demand in high-heat demand scenarios. In addition, in this embodiment, the mounting part 201 is installed on the outside of the air outlet 101 of the fan 1, which reduces the difficulty of disassembly and assembly and improves the convenience of disassembly and assembly.
[0038] It is understandable that the rotation angle of the reversible part 202 relative to the mounting part 201 is positively correlated with the airflow velocity or the rotation speed of the fan 1. Specifically, when the rotation speed of the fan 1 increases, the rotation angle of the reversible part 202 will gradually increase; while when the rotation speed of the fan 1 decreases or the fan 1 is shut off, the reversible part 202 will automatically rotate in the opposite direction under its own gravity and reduce or close the air outlet 101.
[0039] It should be noted that the flow regulating component 2 in this embodiment can also be installed inside the air outlet 101 of the fan 1, as long as the rotatable part 202 can adjust the resistance of the airflow when it flows through the air outlet 101 of the fan 1. Similarly, this embodiment of the present invention does not impose any special limitation on the connection method between the mounting part 201 and the fan 1, as long as the flow regulating component 2 can be stably assembled in the air outlet 101 of the fan 1.
[0040] In one embodiment, such as Figures 1 to 3 As shown, the mounting part 201 is provided with a vent 2011 opposite to the air outlet 101, and a rotatable part 202 is rotatably connected to the inner periphery of the vent 2011. It can be understood that the vent 2011 on the mounting part 201, which is opposite to and connected to the air outlet 101, allows airflow to pass smoothly through the mounting part 201, ensuring that the gas-air mixture can quickly participate in the subsequent combustion process. The rotatable part 202, rotatably connected to the inner periphery of the vent 2011, allows the rotatable part 202 to indirectly adjust the area of the air outlet 101 of the fan 1 by adjusting the area of the vent 2011. Specifically, when the fan 1 rotates at a low speed and the airflow impact force is small, the reversible part 202 will rotate appropriately to block part of the vent 2011, thereby reducing the actual effective flow rate of airflow through the vent 2011 and reducing the combustion load of the gas water heater. When the fan 1 rotates at a gradually increasing speed and the airflow impact force becomes stronger, the reversible part 202 will rotate further under the push of the airflow until the vent 2011 is fully opened. At this time, it can ensure that a sufficient flow rate of gas and air mixture through the vent 2011 is available to meet the supply requirements of the gas water heater for a large amount of mixed gas when the heat demand is high, maintain the fullness and stability of combustion, ensure that the equipment outputs sufficient heat, and provide users with a comfortable and stable hot water supply experience.
[0041] It should be noted that in this embodiment, the rotatable part 202 can be rotatably connected to the inner wall of the vent 2011 by means of a rotating component, such as a rotating shaft. Alternatively, the rotatable part 202 and the mounting part 201 can be integrally made of an elastic material, such as rubber. A groove is provided at the connection between the rotatable part 202 and the mounting part 201, and the rotatable part 202 bends and rotates relative to the side wall of the mounting part 201 through the groove. Furthermore, the number of rotatable parts 202 in this embodiment can be multiple. For example, there is a pair of rotatable parts 202. The ends of the pair of rotatable parts 202 that are away from each other are rotatably connected to the inner wall of the vent 2011, while the ends that are close to each other form a channel suitable for airflow.
[0042] In one embodiment, such as Figures 1 to 3As shown, along the thickness direction of the mounting portion 201, the orthographic projections of the flip-up portion 202 and the air outlet 101 toward the ventilation opening 2011 both fall within the ventilation opening 2011. As mentioned above, the air outlet 101 and the ventilation opening 2011 are arranged opposite each other. Therefore, in this embodiment, having the orthographic projection of the air outlet 101 toward the ventilation opening 2011 fall within the ventilation opening 2011 means that the cross-sectional area of the ventilation opening 2011 is larger than the cross-sectional area of the air outlet 101. This avoids the mounting portion 201 obstructing the air outlet 101, ensuring that when the gas water heater operates at maximum power, sufficient gas and air mixture can enter the subsequent combustion chamber 3 through the air outlet 101 of the fan 1. This ensures that the gas water heater can return to the preset operating level, guaranteeing the user's hot water needs in high-heat demand scenarios. Similarly, the orthographic projection of the rotatable part 202 toward the vent 2011 also falls into the vent 2011, which can reduce the probability of the rotatable part 202 interfering with the surrounding structure during rotation.
[0043] In one embodiment, such as Figure 3 As shown, the rotatable part 202 completely covers and abuts against the outer periphery of the gas outlet 101. It should be noted that in this embodiment, the rotatable part 202 completely covering and abutting against the outer periphery of the gas outlet 101 refers to the state of the rotatable part 202 when the fan 1 speed is zero (i.e., when the gas water heater is not working). From this state, it can be seen that the cross-sectional area of the rotatable part 202 is larger than the cross-sectional area of the gas outlet 101. Compared to the case where the cross-sectional area of the rotatable part 202 is smaller than the cross-sectional area of the gas outlet 101, the larger rotatable part 202 provides greater resistance, thereby allowing for greater adjustment of the airflow within a wider range. This enables the gas water heater to operate efficiently within a wider power range, reducing energy waste and improving combustion efficiency.
[0044] In one embodiment, such as Figure 3 As shown, a gap is left between the side of the rotatable part 202 and the corresponding side of the vent 2011. It can be understood that leaving a gap between the side of the rotatable part 202 and the corresponding side of the vent 2011 can prevent the rotatable part 202 from interfering with the side wall of the vent 2011 during rotation, making the rotation of the rotatable part 202 smoother.
[0045] In one embodiment, such as Figures 1 to 3 As shown, the mounting part 201 is provided with a plurality of mounting holes 2012 located around the vent 2011. The mounting part 201 is connected to the fan 1 by fasteners passing through the mounting holes 2012. In this embodiment, the mounting part 201 is detachably connected to the fan 1 by means of fasteners, which can improve the convenience of disassembling and assembling the flow regulating component 2.
[0046] In one embodiment, such as Figures 1 to 3As shown, the mounting part 201 and the rotatable part 202 are integrally formed. Both the mounting part 201 and the rotatable part 202 are made of an elastic, high-temperature resistant material, which can be one of butyl rubber, silicone rubber, or fluororubber. The integral forming of the mounting part 201 and the rotatable part 202 means that the rotatable part 202 adjusts the airflow through the outlet 101 by bending and rotating relative to the mounting part 201. Therefore, using an integral molding process to produce the flow regulating component 2 ensures the connection strength between the mounting part 201 and the rotatable part 202, improving the durability of the flow regulating component 2. Using an elastic material to prepare the flow regulating component 2 gives the rotatable part 202 good deformation recovery ability, ensuring that it can effectively adjust the flow of the mixed airflow at the vent 2011. Furthermore, since the outlet 101 of the fan 1 is relatively close to the combustion chamber 3 of the gas-fired water heater, using a high-temperature resistant material to prepare the flow regulating component 2 reduces the impact of high temperatures on the overall structure of the flow regulating component 2, extending its service life.
[0047] According to an embodiment of the present invention, on the other hand, as... Figure 4 As shown, a gas-fired water heater is also provided, including a combustion chamber 3 and the aforementioned air intake device. Specifically, the outlet of the blower 1 is connected to the combustion chamber 3 via an air intake pipe 4; the flow regulator 2 is installed at the connection between the outlet of the blower and the air intake pipe 4.
[0048] Compared to existing gas-fired water heaters, those equipped with the aforementioned air intake device can operate continuously at a lower combustion load for extended periods when users require less heat. This avoids the frequent start-ups and shutdowns caused by gas-fired water heaters operating at high power to achieve lower temperatures, reducing mechanical wear and extending service life. Furthermore, because gas-fired water heaters can operate continuously at lower power, they not only prevent sudden temperature fluctuations, ensuring a better user experience, but also reduce gas consumption, improve combustion efficiency, and minimize energy waste.
[0049] It should be noted that the gas-fired water heating equipment in this embodiment may be, but is not limited to, a gas-fired wall-hung boiler and a gas-fired water heater.
[0050] The following description uses a gas-fired wall-hung boiler as an example to illustrate the solution of the present invention.
[0051] When the gas-fired wall-hung boiler is working, the fan 1 rotates, causing pressure changes in the air box. This pressure changes allow air from the air box to enter the air intake duct 5. One end of the air intake duct 5 has a flared inlet 501, and the other end is sealed to the premixer 7 via a sleeve connection. A pressure tap 502 is located at the arc of the air intake duct 5. One end of the pressure tapping pipe 6 is connected to the pressure tap 502, and the other end is connected to the gas proportional valve 8. The gas proportional valve 8 obtains the gas pressure from the air intake duct 5 through the pressure tapping pipe 6, further opening the valve to control the gas opening. This allows gas to enter the premixer 7 through the gas intake pipe 9 and the gas intake inlet 10, where air and gas are mixed in a 1:1 ratio. The air-fuel mixture then enters the combustion chamber 3 through the blower 1 and the blower 1 outlet 101 for combustion. The mounting part 201 is fixed to the blower 1 outlet 101 by fasteners such as screw holes passing through the mounting holes 2012 around it, and there is also a rotatable part 202 in the middle that can swing up and down.
[0052] When the gas boiler is not in operation, the tiltable part 202 is normally closed under gravity. When the gas boiler is operating under low load, the rotation angle of the tiltable part 202 is small, and it is in a slightly open state, with some resistance at the air outlet 101 of the fan 1. At this time, the air velocity and pressure in the air intake pipe 5 decrease, and the pressure received in the gas proportional valve 8 connected through the pressure tapping pipe 6 decreases synchronously. The opening of the gas valve decreases, the gas flow rate decreases, the flow rate of the gas-air mixture decreases, the combustion load of the gas boiler decreases, and a larger regulation ratio is obtained. When the gas boiler is operating under high load, the fan 1 rotates at a high speed, the rotation angle of the tiltable part 202 increases, or it is in a fully open state, and the mixture flows through the air outlet 101 of the fan 1 without obstruction. In addition, there is a very short time interval between the change in air pressure in the air intake pipe 5 and the gas proportional valve 8 receiving this change. During this interval, the ratio of gas and air in the premixer 7 is not 1:1, but this does not affect the use of the gas wall-hung boiler.
[0053] In one embodiment, such as Figures 1 to 4 As shown, both the outlet end of the fan and the inlet end of the inlet pipe 4 have annular flanges 102 facing each other. The mounting part 201 is located between the pair of annular flanges 102 and is detachably connected to the pair of annular flanges 102. In this embodiment, by providing a pair of annular flanges 102, a mounting point can be provided to connect the outlet end of the fan, the inlet end of the inlet pipe 4, and the mounting part 201 together. It can be understood that by placing the flow regulating component 2 between the outlet end of the fan and the inlet end of the inlet pipe 4, not only can the flow rate through the outlet 101 be adjusted, but the gap between the outlet end of the fan and the inlet end of the inlet pipe 4 can also be sealed.
[0054] In one embodiment, such as Figure 4 As shown, the mounting part 201 and a pair of annular flanges 102 are provided with coaxial and interconnected mounting holes 2012. The mounting part 201 is connected to the pair of annular flanges 102 by fasteners passing through the mounting holes 2012. In this embodiment, the mounting part 201 is detachably connected to the fan 1 by means of fasteners, which can improve the convenience of disassembling and assembling the flow regulating component 2.
[0055] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.
[0056] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. An air intake device for a gas water heating apparatus, characterized by, The application relates to a fan (1) and an air inlet device (2) thereof. The fan (1) has an air outlet (101); the air inlet device (2) comprises a mounting part (201) and a reversible part (202); the mounting part (201) is mounted on the outer side of the air outlet (101), and the reversible part (202) is arranged on the air outlet (101); the reversible part (202) is rotationally connected with the mounting part (201) to adjust the air flow of the air outlet (101). The mounting part (201) is provided with a ventilation opening (2011) arranged opposite to the air outlet (101), and the reversible part (202) is rotationally connected to the inner wall of the ventilation opening (2011).
2. The air intake device of claim 1, wherein: The reversible part (202) and the air outlet (101) are projected onto the ventilation opening (2011) along the thickness direction of the mounting part (201).
3. The air intake device of claim 2, wherein: The reversible part (202) completely covers and abuts the outer periphery of the air outlet (101).
4. The air intake device of claim 3, wherein: The side edge of the reversible part (202) is provided with a gap relative to the corresponding side edge of the ventilation opening (2011).
5. The air intake device of claim 3, wherein: The mounting part (201) is provided with a plurality of mounting holes (2012) arranged on the side of the ventilation opening (2011), and the mounting part (201) is connected with the fan (1) through fasteners penetrating the mounting holes (2012).
6. The air intake device of claim 2, wherein: The mounting part (201) and the reversible part (202) are integrally formed; the mounting part (201) and the reversible part (202) are made of elastic high-temperature-resistant materials.
7. The air intake device of any one of claims 1 to 6, wherein: The application relates to a fan (1) and an air inlet device (2) thereof.
8. A gas water heating apparatus, characterised in that, The application relates to a fan (1) and an air inlet device (2) thereof. The fan (1) has an air outlet (101); the air inlet device (2) comprises a mounting part (201) and a reversible part (202); the mounting part (201) is mounted on the outer side of the air outlet (101), and the reversible part (202) is arranged on the air outlet (101); the reversible part (202) is rotationally connected with the mounting part (201) to adjust the air flow of the air outlet (101). The mounting part (201) is provided with a ventilation opening (2011) arranged opposite to the air outlet (101), and the reversible part (202) is rotationally connected to the inner wall of the ventilation opening (2011).
9. Gas water heating apparatus according to claim 8, characterised in that: The reversible part (202) and the air outlet (101) are projected onto the ventilation opening (2011) along the thickness direction of the mounting part (201).
10. Gas water heating apparatus according to claim 9, characterised in that: The reversible part (202) completely covers and abuts the outer periphery of the air outlet (101). The side edge of the reversible part (202) is provided with a gap relative to the corresponding side edge of the ventilation opening (2011). The mounting part (201) is provided with a plurality of mounting holes (2012) arranged on the side of the ventilation opening (2011), and the mounting part (201) is connected with the fan (1) through fasteners penetrating the mounting holes (2012). The mounting part (201) and the reversible part (202) are integrally formed; the mounting part (201) and the reversible part (202) are made of elastic high-temperature-resistant materials.