Smoke exhaust assembly and outdoor gas water heater

Abstract

The utility model relates to the technical field of gas water heaters, and discloses a smoke exhaust assembly which comprises an installation face, a smoke exhaust pipe and a smoke exhaust pipe. The cover body is connected to the mounting surface and forms a smoke exhaust cavity communicated with the smoke outlet; the smoke exhaust cavity is provided with a top wall and a side wall connected with the edge of the top wall in a surrounding mode. The top wall is positioned above the smoke outlet and is aligned with the smoke outlet; the side wall is provided with a smoke outlet for discharging smoke; the buffering structure comprises a rotating shaft which is rotatably arranged on the top wall, the rotating shaft is aligned to the smoke outlet, and a plurality of spoilers are arranged on the rotating shaft. The rotating shaft rotates relative to the cover body, the spoilers synchronously rotate along with the rotating shaft, smoke is spoiled, the flowing direction of the smoke is changed, the smoke is more evenly distributed in the smoke discharging cavity, the smoke is prevented from intensively impacting and colliding with the top wall, vortex is reduced, and smoke discharging smoothness is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas water heaters, in particular to a smoke exhaust component and an outdoor gas water heater. Background Art

[0002] A gas water heater is a water heater that uses gas as energy. It generates heat by burning gas, which in turn heats water to provide hot water for homes or commercial places. When a gas water heater is used as an outdoor unit, the smoke exhaust port of its smoke collection device is prone to water ingress and dust accumulation. To ensure the normal operation and safety of the equipment, most existing outdoor gas water heaters are equipped with a waterproof and dustproof smoke exhaust hood at the smoke exhaust port.

[0003] Existing outdoor gas water heaters usually include a bottom cover and a smoke exhaust hood connected to the bottom cover, with a cavity formed in the smoke exhaust hood. When in use, the bottom cover is installed on the smoke exhaust port of the gas water heater, the smoke exhaust port extends into the bottom cover and communicates with the cavity of the smoke exhaust hood, and the smoke exhaust hood covers the smoke exhaust port to prevent dust and rain. The smoke generated by the gas water heater enters the smoke exhaust hood through the smoke exhaust port and is finally discharged outward through the window on the side wall of the hood, thereby ensuring normal smoke exhaust of the gas water heater.

[0004] However, the existing outdoor gas water heaters have the following defects when in use: when the gas water heater works at low power, the smoke exhaust volume and the initial smoke flow rate per unit time are small, and the smoke encounters a small smoke exhaust resistance after entering the smoke exhaust hood, which will not affect the normal smoke exhaust of the gas water heater; and when the gas water heater works at high power, the smoke exhaust volume and the initial smoke flow rate per unit time are large, and the cavity top wall of the smoke exhaust hood will directly impact and collide with the smoke discharged from the smoke exhaust port, which not only seriously reduces the flow rate of the smoke, but also easily forms a vortex at the top of the smoke exhaust port, affecting subsequent smoke exhaust and reducing the smoothness of smoke exhaust. Utility Model Content

[0005] The utility model aims to provide a smoke exhaust component and an outdoor gas water heater to solve the above problems.

[0006] In order to achieve the above objectives, the following technical solutions are provided:

[0007] In the first aspect, the utility model provides a smoke exhaust component, comprising: a mounting surface, on which a smoke outlet is arranged; a cover body, which is connected to the mounting surface and forms a smoke exhaust cavity connected to the smoke outlet; the smoke exhaust cavity has a top wall and side walls surrounding and connecting the edges of the top wall; the top wall is positioned above the smoke outlet and aligned with the smoke outlet; the side wall is provided with a smoke exhaust cavity for exhausting smoke; a buffer structure, comprising a rotating shaft rotatably arranged on the top wall, the rotating shaft is aligned with the smoke outlet, and a plurality of spoilers are arranged on the rotating shaft.

[0008] As an optional solution of the smoke exhaust assembly provided by the utility model, the multiple spoilers are evenly arranged on the rotating shaft in the circumferential direction, the spoilers are wing-shaped blades, and the spoilers are driven by the smoke from the smoke outlet and thus drive the rotating shaft to rotate.

[0009] As an optional solution of the smoke exhaust assembly provided by the utility model, the top wall is provided with a mounting hole, the top outer wall of the rotating shaft is rotatably connected with a bearing, and the bearing is detachably engaged in the mounting hole.

[0010] As an optional solution of the smoke exhaust assembly provided by the utility model, the outer ring of the bearing is provided with an elastic sleeve, and the bearing is elastically clamped to the mounting hole through the elastic sleeve.

[0011] As an optional solution of the smoke exhaust assembly provided by the utility model, the outer wall of one end of the elastic sleeve close to the smoke outlet is radially inclined to form a drainage chamfer.

[0012] As an optional solution of the smoke exhaust assembly provided by the utility model, a motor is provided on the cover body, and the motor is connected to one end of the rotating shaft and is used to drive the rotating shaft to rotate relative to the smoke outlet.

[0013] As an optional solution of the smoke exhaust assembly provided by the utility model, the buffer structure also includes a guide surface aligned with the smoke outlet, the guide surface is arranged at the bottom end of the top wall, and is used to guide and buffer the smoke discharged from the smoke outlet, and the rotating shaft is rotatably arranged at the bottom of the guide surface.

[0014] As an optional solution of the smoke exhaust assembly provided by the utility model, the buffer structure includes a flow guide arranged at the bottom end of the top wall; the flow guide is a conical structure, and its conical top end is aligned and points to the smoke outlet, and the side surface of the flow guide extends from the conical top end of the flow guide to the bottom end of the top wall, and the flow guide surface is formed on the side surface of the flow guide.

[0015] As an optional solution of the smoke exhaust assembly provided by the utility model, the bottom of the top wall is recessed downward to form the guide body as a whole.

[0016] In a second aspect, the utility model further provides an outdoor gas water heater, comprising a casing, wherein a burner, a heat exchanger and a smoke collecting device are arranged in the casing, and also comprises the smoke exhaust assembly as described above.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows: the shaft rotates relative to the cover body, and the spoiler rotates synchronously with the shaft to disturb the smoke, change the flow direction of the smoke, make the smoke more evenly distributed in the smoke exhaust chamber, avoid the smoke concentrated impact and collision with the top wall, reduce the formation of vortex, and improve the smoothness of smoke exhaust. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the structure of the smoke exhaust component Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the structure of the smoke exhaust component Figure 2 ;

[0021] Figure 3 It is a schematic diagram of the structure of the cover;

[0022] Figure 4 This is a cross-sectional diagram of the smoke exhaust assembly. Figure 1 ;

[0023] Figure 5 This is a cross-sectional diagram of the smoke exhaust assembly. Figure 2 ;

[0024] Figure 6 This is a cross-sectional diagram of the smoke exhaust assembly. Figure 3 .

[0025] In the figure:

[0026] 1. Installation surface; 2. Cover body; 21. Smoke exhaust cavity; 22. Top wall; 23. Side wall; 24. Smoke exhaust port;

[0027] 25. mounting hole; 3. smoke outlet; 4. buffer structure; 41. flow guide surface; 42. flow guide body; 43. first flow guide arc surface; 44. second flow guide arc surface; 45. rotating shaft; 46. spoiler; 47. bearing;

[0028] 48. Elastic ferrule; 49. Drainage chamfer; 5. Casing. DETAILED DESCRIPTION

[0029] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Implementation case 1:

[0033] refer to Figure 1 to Figure 4 A smoke exhaust component includes a mounting surface 1 and a cover body 2. The mounting surface 1 is provided with a smoke outlet 3. The cover body 2 is connected to the mounting surface 1 and forms a smoke exhaust cavity 21 connected to the smoke outlet 3. The bottom of the cover body 2 is provided with a smoke outlet 3 connected to the smoke exhaust cavity 21. The smoke outlet 3 can be connected to the smoke outlet end of the gas water heater and then transport smoke into the smoke exhaust cavity 21. The smoke exhaust cavity 21 includes a top wall 22 and a side wall 23. The top wall 22 is arranged in alignment with the smoke outlet 3. The side panels surround and connect the edges of the top wall 22. A plurality of smoke exhaust ports 24 are provided on the side wall 23 for exhausting the smoke in the smoke exhaust cavity 21. In this embodiment, at least one smoke exhaust port 24 has a bottom height lower than the smoke outlet 3.

[0034] During operation, the smoke outlet 3 is connected to the smoke exhaust end of the gas water heater, and the cover body 2 is connected to cover the smoke outlet 3 to prevent dust and rain. The smoke generated by the gas water heater enters the smoke exhaust cavity 21 through the smoke outlet 3 and is finally discharged outward through the smoke exhaust port 24 on the side wall 23, thereby ensuring the normal smoke exhaust of the gas water heater.

[0035] Another improvement of the present application is that a buffer structure 4 is provided at the bottom end of the top wall 22, and the buffer structure 4 has a guide surface 41 aligned with the smoke outlet 3, and the guide surface 41 is connected to the bottom end of the top wall 22 to adjust the smoke flow path and guide and buffer the smoke. By providing the buffer structure 4 and using the guide surface 41 to adjust the smoke flow path of the smoke outlet 3 and buffer the smoke, the direct collision between the smoke and the top wall 22 during high-power operation can be effectively reduced, thereby reducing the smoke exhaust resistance and improving the smoke exhaust efficiency.

[0036] Specifically, in this embodiment, the buffer structure 4 includes a guide body 42 arranged at the bottom of the top wall 22, and the guide body 42 is configured to guide the flow of fluid, and the end of the guide body 42 is close to the smoke outlet 3, that is, the top of the guide body 42 points to the smoke outlet 3, and the side of the guide body 42 gradually expands from the end of the guide body 42 close to the smoke outlet 3 and continuously extends to the bottom of the top wall 22, and the above-mentioned guide surface 41 is formed along this side. Through the above-mentioned technical scheme, during the smoke exhaust process, the top of the guide body 42 can first bear the impact of the smoke from the smoke outlet 3, and through the structure of the gradual expansion and extension of the side of the guide body 42, the smoke is dispersed and guided, so that the originally concentrated smoke is dispersed to form a more uniform flow field, and flows steadily and smoothly along the side of the guide body 42 to the top wall 22, playing a buffering role, so that the smoke can be discharged more smoothly through the smoke outlet 24 of the side cover, thereby improving the smoke exhaust efficiency.

[0037] Of course, the shapes and formation methods of the guide body 42 and the guide surface 41 are diverse. In addition to the above-mentioned implementation structure, the guide body 42 can also be a hemispherical structure or other shape structures that can play the same guiding role. Correspondingly, the guide surface 41 is also a hemispherical surface or other shapes. In this implementation case, the guide body 42 is specifically designed as a conical structure, and the guide surface 41 is designed as a conical surface formed on the side of the guide body 42. Compared with the above-mentioned hemispherical structure, it has a sharper top and reduces unnecessary curved surfaces and transitions. It can be more directly aligned with the smoke outlet 3, making the flow path of the smoke clearer. Especially when the gas water heater is working at high power, the guide body 42 with a conical structure can better adapt to and adjust the flow rate and direction of the smoke, and while affecting the smoke flow rate to a lesser extent, it can better reduce the formation of vortices and improve the smoothness of smoke exhaust.

[0038] In order to further enhance the buffering effect of the guide body 42 on the smoke, in this embodiment, the buffer structure 4 also includes a first guide arc surface 43, the first guide arc surface 43 is closed around the guide body 42, the inner end of the first guide arc surface 43 is connected to the top of the guide surface 41 with a downward curvature, and the outer end of the first guide arc surface 43 is connected to the bottom surface of the top wall 22 with an upward curvature. By setting the first guide arc surface 43, the inner and outer ends of the first guide arc surface 43 are connected to the "guide surface 41" and the "bottom surface of the top wall 22" with a continuous curvature, which can ensure that the smoke can more smoothly transition from the guide body 42 to the top wall 22 after flowing along the guide surface 41, reducing the smoke flow resistance, while reducing the direct collision between the smoke and the top wall 22, ensuring the continuous flow of the smoke.

[0039] Furthermore, in order to make the smoke transition more smoothly from the bottom surface of the top wall 22 to the side wall 23, in this embodiment, the bottom edge of the top wall 22 is surrounded by a second guide arc surface 44, and the second guide arc surface 44 extends continuously from the bottom edge curvature of the top wall 22 to connect to the top of the side wall 23. During operation, the smoke flowing through the top wall 22 can smoothly transition to the side wall 23 along the second guide arc surface 44, instead of directly hitting the side wall 23, reducing the flow resistance of the smoke and the possibility of vortex formation, thereby improving the smoothness and efficiency of smoke exhaust.

[0040] Of course, the formation and implementation structure of the flow guide 42 is diverse. In this embodiment, the flow guide 42 is formed as an integral unit by a downward depression at the bottom of the top wall 22. The one-piece molding design can not only simplify the outdoor gas water heater, but also reduce the interface between the flow guide 42 and the top wall 22, which is conducive to obtaining a smoother and smoother flue gas flow path and improving the buffering and diversion effect of the flow guide 42.

[0041] In addition, in order to improve the versatility of the buffer structure 4, this embodiment provides another implementation structure for forming the flow guide 42: the flow guide 42 can be detachably connected to the bottom end of the top wall 22 by bolts, buckles, slots, bonding, etc., and the first flow guide arc surface 43 is integrally formed at the bottom end of the side of the flow guide 42 and abuts against the bottom surface of the top wall 22. By detachably connecting the flow guide 42 to the top wall 22, the actual production process allows the manufacturer to assemble flow guides 42 of different specifications according to parameters such as product smoke exhaust power without changing the size structure of the cover body 2, thereby improving the versatility of the buffer structure 4.

[0042] refer to Figure 4 , Figure 5 and Figure 6In order to further improve the smoothness of smoke exhaust, in this embodiment, the buffer structure 4 also includes a rotating shaft 45, which is aligned with the smoke outlet 3, and the rotating shaft 45 is rotatably connected to the top wall 22 of the cover body 2, and a plurality of spoilers 46 are arranged on the rotating shaft 45. When the smoke outlet 3 transports smoke into the smoke exhaust cavity 21, the rotating shaft 45 can be rotated relative to the cover body 2, and the spoiler 46 rotates synchronously with the rotating shaft 45 to disturb the smoke, change the flow direction of the smoke, and make the smoke more evenly distributed in the smoke exhaust cavity 21, so as to avoid the smoke from concentratedly impacting and colliding with the top wall 22, reduce the formation of vortex, and improve the smoothness and efficiency of smoke exhaust.

[0043] Another technical problem to be solved by the present application is introduced as follows: Currently, the gas used to generate heat in a gas water heater is usually natural gas or liquefied petroleum gas (LPG). The combustion process will generate water vapor, which will be discharged from the smoke outlet 3 together with the smoke. During the smoke exhaust process, after the smoke contacts the smoke exhaust cavity 21, it is easy for the smoke to condense on the inner wall of the smoke exhaust cavity 21 to form liquid water. Since the smoke outlet 3 extends out of the mounting surface 1, the height of the port is higher than the mounting surface 1. The liquid water formed by the condensation on the side wall 23 of the smoke exhaust cavity 21 will flow down to the mounting surface 1 and The condensed water flows out of the smoke exhaust cavity 21 through the gap between the mounting surface 1 and the side wall 23, or accumulates and rises to the smoke exhaust port 24 at the lowest position of the side wall 23, and is discharged from the smoke exhaust cavity 21 through the smoke exhaust port 24, thereby preventing the condensed water from flowing back into the gas water heater through the smoke outlet 3. However, since the top wall 22 is aligned with the smoke outlet 3, the liquid water condensed on the top wall 22 can easily drip into the smoke outlet 3 under the action of its own gravity, thereby causing water accumulation inside the flue, increasing the risk of flue corrosion, affecting the normal discharge of flue gas, and causing poor smoke exhaust or backflow. At the same time, the design of the buffer structure 4 and the guide surface 41 in the smoke exhaust cavity 21 of this embodiment solves the technical problem of the collision and impact between the smoke and the top wall 22 and improving the smoothness of smoke exhaust. However, at the same time, the design of the conical structure of the guide body 42 and the guide surface 41 makes it easier for the condensed water formed on the top wall 22 to be gathered, so that the condensed water can be concentrated and drip into the smoke outlet 3, making the above technical problems more serious.

[0044] In order to further solve the problem of condensed water dripping into the smoke outlet 3, in this embodiment, the rotating shaft 45 is rotatably connected to the top of the conical structure of the guide body 42. By setting the rotating shaft 45 at the top of the guide body 42, the condensed water on the top wall 22 and the guide body 42 can be collected and drained by the rotating shaft 45, and the condensed water can be radially thrown out by the centrifugal force generated by its own rotation, thereby preventing the condensed water from naturally dripping into the smoke outlet 3.

[0045] Of course, there are various ways for the shaft 45 to rotate. For example, a motor is provided on the cover 2, and the output end of the motor is connected to the shaft 45, and the motor drives the shaft 45 to rotate relative to the smoke outlet 3. By providing a motor, the motor actively drives the shaft 45 to rotate relative to the cover 2, so that the spoiler 46 can perform spoiling in a stable and sufficient power state, and obtain a better spoiling effect. However, the motor will increase the energy consumption of the gas water heater. In actual use, the motor needs to be sealed to adapt to the outdoor working environment, which increases the production cost and difficulty.

[0046] In this regard, in this embodiment, the shape and connection method of the spoiler 46 are further limited, and multiple spoilers 46 are evenly arranged on the rotating shaft 45 in the circumferential direction, and the spoiler 46 is set as a wing-shaped blade structure. When the outdoor gas water heater works at high power, the flue gas flow rate and flow velocity increase, and the flue gas will flow through the spoiler 46 synchronously when impacting the top wall 22. The spoiler 46 with a wing-shaped blade structure can effectively capture and utilize the flow force of the flue gas, form a rotation torque, and drive the rotating shaft 45 to rotate. Compared with setting a motor to actively drive the rotating shaft 45 to rotate, the present embodiment adopts the technical solution of "a spoiler 46 with a wing-shaped blade structure, and the spoiler 46 and the rotating shaft 45 passively rotate under the drive of the flue gas and wind". The rotation of the rotating shaft 45 and the spoiler 46 can be realized without additional power supply, and the energy consumption is low. In addition, since the rotating shaft 45 and the spoiler 46 are arranged at the top of the guide body 42, the spoiler 46 with a wing-shaped blade structure has the effect of gathering the flue gas when rotating, and can generate a certain negative pressure to blow part of the flue gas to the guide surface 41, so that the flue gas can be closer to the guide surface 41, and the wall attachment effect between the flue gas flow and the guide surface 41 is more obvious, thereby enhancing the guide effect of the guide surface 41 on the flue gas, and further reducing the direct collision and impact between the flue gas and the top wall 22 during high-power operation.

[0047] refer to Figure 6 Considering that the rotating shaft 45 and the spoiler 46 need to work in a harsh environment of high temperature and humidity for a long time, the connection method of the rotating shaft 45 and the spoiler 46 is limited in this embodiment. The top wall 22 is provided with a mounting hole 25, that is, the top of the conical structure of the flow guide body 42 is provided with a mounting hole 25, and the top of the rotating shaft 45 is rotatably connected to the outer side of the bearing 47, and the outer ring of the bearing 47 is detachably engaged in the mounting hole 25. Through the above technical solution, the rotating shaft 45 is rotatably connected to the cover body 2 through the bearing 47, which can ensure that the rotating shaft 45 can also rotate stably in a high temperature and humid environment. In addition, the mounting hole 25 is provided to engage the bearing 47, so that the rotating shaft 45 can be detachably connected to the cover body 2, which reduces the production difficulty and is also conducive to the maintenance and cleaning of the rotating shaft 45 and the spoiler 46 in the later stage.

[0048] In addition, in this embodiment, the outer ring of the bearing 47 is provided with an elastic sleeve 48, and the bearing 47 is clamped in the mounting hole 25 through the elastic sleeve 48. The outer wall of the end of the elastic sleeve 48 close to the smoke outlet 3 is radially inclined to form a drainage chamfer 49. By providing the elastic sleeve 48 to elastically clamp the mounting hole 25, not only can the difficulty of installing and disassembling the bearing 47 be reduced, but also a certain buffering and shock-absorbing effect can be played, reducing the influence of the mechanical vibration of the gas water heater on the condensate drainage effect of the rotating shaft 45. In addition, the drainage chamfer 49 is provided on the elastic sleeve 48, and the condensate drainage flowing down to the top of the conical structure of the guide body 42 can be transferred to the rotating shaft 45 through the drainage chamfer 49, thereby enhancing the drainage effect of the rotating shaft 45 on the condensate. In this embodiment, the elastic sleeve 48 is made of rubber, and the rotating shaft 45 and the spoiler 46 are made of stainless steel.

[0049] Implementation case 2:

[0050] refer to Figure 1 , an outdoor gas water heater, comprising a casing 5, in which a burner, a heat exchanger and a smoke collecting device are arranged, and also includes an outdoor gas water heater as in implementation case 1, in which a mounting surface 1 and a smoke outlet 3 of the outdoor gas water heater are formed on the casing 5.

[0051] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A smoke exhaust assembly, characterized in that: include: A mounting surface (1) on which a smoke outlet (3) is provided; A cover body (2) connected to the mounting surface (1) and forming a smoke exhaust cavity (21) connected to the smoke outlet (3); The smoke exhaust cavity (21) comprises a top wall (22) and a side wall (23) surrounding and connecting the edge of the top wall (22); The top wall (22) is positioned above the smoke outlet (3) and aligned with the smoke outlet (3); The side wall (23) is provided with a smoke exhaust port (24) for exhausting smoke; The buffer structure (4) comprises a rotating shaft (45) rotatably arranged on the top wall (22), the rotating shaft (45) being aligned with the smoke outlet (3), and a plurality of spoilers (46) being arranged on the rotating shaft (45), the spoilers (46) being used to rotate with the rotating shaft (45) to disturb the smoke discharged from the smoke outlet (3).

2. The smoke exhaust assembly according to claim 1, characterized in that: The plurality of spoilers (46) are uniformly arranged on the rotating shaft (45) in the circumferential direction; the spoilers (46) are wing-shaped blades; the spoilers (46) are driven by smoke from the smoke outlet (3) and thereby drive the rotating shaft (45) to rotate.

3. The smoke exhaust assembly according to claim 2, characterized in that: The top wall (22) is provided with a mounting hole (25), and the top outer wall of the rotating shaft (45) is rotatably connected with a bearing (47), and the bearing (47) is detachably engaged in the mounting hole (25).

4. The smoke exhaust assembly according to claim 3, characterized in that: The outer ring of the bearing (47) is provided with an elastic clamping sleeve (48), and the bearing (47) is elastically clamped to the mounting hole (25) through the elastic clamping sleeve (48).

5. The smoke exhaust assembly according to claim 4, characterized in that: The outer wall of one end of the elastic sleeve (48) close to the smoke outlet (3) is radially inclined to form a drainage chamfer (49).

6. The smoke exhaust assembly according to claim 1, characterized in that: The cover body (2) is provided with a motor, which is connected to one end of the rotating shaft (45) and is used to drive the rotating shaft (45) to rotate relative to the smoke outlet (3).

7. The smoke exhaust assembly according to any one of claims 1 to 5, characterized in that: The buffer structure (4) further comprises a guide surface (41) aligned with the smoke outlet (3); the guide surface (41) is arranged at the bottom end of the top wall (22) and is used to guide and buffer smoke discharged from the smoke outlet (3); the rotating shaft (45) is rotatably arranged at the bottom end of the guide surface (41).

8. The smoke exhaust assembly according to claim 7, characterized in that: The buffer structure (4) comprises a flow guide (42) arranged at the bottom end of the top wall (22); the flow guide (42) is configured to guide the flow of fluid, with its top end pointing to the smoke outlet (3), and the side surface of the flow guide (42) gradually expanding from one end close to the smoke outlet (3) and continuously extending to the bottom end of the top wall (22), and the flow guide surface (41) is formed along this side surface.

9. The smoke exhaust assembly according to claim 8, characterized in that: The bottom of the top wall (22) is recessed downward to integrally form the flow guide (42).

10. An outdoor gas water heater, characterized in that: The invention comprises a burner, a heat exchanger and a smoke collecting device, and also comprises a smoke exhaust assembly as claimed in any one of claims 1 to 9.

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