Exhaust hood structure and outdoor gas water heater

Abstract

The utility model relates to the technical field of outdoor gas water heaters, and discloses a smoke exhaust hood structure which comprises an installation face, a smoke exhaust hood body and a smoke exhaust hood body. The cover body is connected to the mounting surface and comprises a top cover and a side cover; the top end of the side cover is connected with the edge of the top cover in a surrounding manner, the bottom end of the side cover is connected with the mounting surface in a surrounding manner, and the top cover, the side cover and the mounting surface are matched to form a smoke exhaust cavity communicated with the smoke outlet; the side cover is provided with a plurality of smoke outlets; and the buffering structure is provided with a flow guide face aligned with the smoke outlet, and the flow guide face is connected with the bottom end of the top cover and used for conducting flow guide buffering on smoke exhausted from the smoke outlet. According to the utility model, the flue gas flow path can be adjusted, the flue gas can be buffered, and the direct collision between the flue gas and the top cover during high-power work can be effectively reduced, so that the flue gas discharge resistance is reduced, and the flue gas discharge efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of outdoor gas water heaters, in particular to a smoke exhaust hood structure 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 cover body connected to the bottom cover, a cavity is formed in the cover body, 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 cover body, the smoke exhaust port is covered by the cover body, dust and rain protection is played, and 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 of the side wall of the cover body, ensuring the 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 hood structure 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 hood structure, comprising: a mounting surface, on which a smoke outlet is provided; a hood body, which is connected to the mounting surface and comprises a top cover and a side cover; the top end of the side cover is enclosed and connected to the edge of the top cover, and the bottom end of the side cover is enclosed and connected to the mounting surface, and the top cover, the side cover and the mounting surface cooperate to form a smoke exhaust cavity connected to the smoke outlet; the side cover is provided with a plurality of smoke exhaust outlets; a buffer structure, which has a guide surface aligned with the smoke outlet, the guide surface is connected to the bottom end of the top cover, and is used to guide and buffer the smoke discharged from the smoke outlet.

[0008] As an optional solution for the smoke exhaust hood structure provided by the utility model, the buffer structure includes a guide body arranged at the bottom end of the top cover; the guide body is a conical structure, and its conical top end is aligned and points to the smoke outlet, and the side surface of the guide body extends from the conical top end of the guide body to the bottom end of the top cover, and the guide surface is formed on the side surface of the guide body.

[0009] As an optional solution of the smoke exhaust hood structure provided by the utility model, the buffer structure also includes a first guide arc surface, which closes the guide body in a closed loop; the inner end curvature of the first guide arc surface is continuously connected to the top of the guide surface, and the outer end curvature is continuously connected to the bottom end of the top cover.

[0010] As an optional solution of the smoke exhaust hood structure provided by the utility model, the bottom edge of the top cover is surrounded by a second guide arc surface, and the second guide arc surface extends continuously from the bottom edge of the top cover to connect to the top of the side cover.

[0011] As an optional solution of the smoke exhaust hood structure provided by the utility model, the bottom of the top cover is recessed downward to form the flow guide body as a whole.

[0012] As an optional solution of the smoke exhaust hood structure provided by the utility model, the flow guide body is detachably connected to the bottom of the top cover, and the first flow guide arc surface is integrally formed at the bottom end of the side of the flow guide body.

[0013] As an optional solution of the smoke exhaust hood structure provided by the utility model, a water removal structure is provided in the smoke exhaust cavity, and the water removal structure is connected to the bottom end of the guide surface, and is used to drain the condensed water formed on the surface of the guide surface to prevent the condensed water from entering the smoke outlet.

[0014] As an optional solution of the smoke exhaust hood structure provided by the utility model, the water removal structure includes a water absorption rope passed through the hood body; the water absorption rope has a water absorption end and a water discharge end; the water absorption end extends into the smoke exhaust cavity, and the water absorption end extends along the inner wall of the hood body and is connected to the bottom end of the guide surface, and the water discharge end passes through the hood body and is positioned below the water absorption end.

[0015] As an optional solution of the smoke exhaust hood structure provided by the utility model, the water removal structure includes a drainage rod and a drainage port arranged on the hood body, and the drainage port is positioned below the guide surface; one end of the drainage rod is connected to the bottom end of the guide surface, and the other end of the drainage rod extends obliquely to the drainage port and is connected to the drainage port.

[0016] In a second aspect, the utility model also provides an outdoor gas water heater, which includes the exhaust hood structure as described above, and also includes a casing, in which a burner, a heat exchanger and a smoke collecting device are arranged, and a mounting surface and a smoke outlet are formed on the casing.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. By setting up a buffer structure and using the guide surface to adjust the smoke flow path of the smoke outlet, the smoke can be buffered, which can effectively reduce the direct collision between the smoke and the top cover during high-power operation, thereby reducing the smoke exhaust resistance and improving the smoke exhaust efficiency;

[0019] 2. By setting up a water removal structure, the water removal structure is connected to the bottom end of the guide surface to drain the condensed water formed on the surface of the guide body, thereby preventing the condensed water from entering the smoke outlet and ensuring the normal operation of the gas water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 This is a schematic diagram of the exhaust hood structure. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the exhaust hood structure. Figure 2 ;

[0023] Figure 3 It is a structural schematic diagram of the smoke exhaust hood structure when the hood body is not provided with a water removal structure;

[0024] Figure 4 is a cross-sectional schematic diagram of the exhaust hood structure;

[0025] Figure 5 This is a schematic diagram of the structure of the smoke exhaust hood when the hood body is equipped with a water removal structure Figure 1 ;

[0026] Figure 6 This is a schematic diagram of the structure of the smoke exhaust hood when the hood body is equipped with a water removal structure Figure 2 .

[0027] In the figure:

[0028] 1. Installation surface; 2. Cover body; 21. Top cover; 22. Side cover; 23. Smoke exhaust port; 3. Smoke exhaust cavity; 4. Smoke outlet; 5. Buffer structure; 51. Guide surface; 52. Guide body; 53. First guide arc surface; 54. Second guide arc surface; 6. Water removal structure; 61. Water absorption rope; 611. Water absorption end; 612. Drainage end; 62. Fixing plate; 63. Drainage rod; 64. Drainage port; 7. 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 4A smoke exhaust hood structure includes a mounting surface 1 and a hood body 2 connected to the mounting surface 1, the hood body 2 includes a top cover 21 and a side cover 22, the top end of the side cover 22 is enclosed and connected to the edge of the top cover 21, the bottom end of the side cover 22 is enclosed and connected to the mounting surface 1, the bottom surface of the top cover 21, the inner wall of the side cover 22 and the mounting surface 1 cooperate to form a smoke exhaust cavity 3, the mounting surface 1 is provided with a smoke outlet 4 connected to the smoke exhaust cavity 3, the side cover 22 is provided with a plurality of smoke exhaust outlets 23, and the bottom height of at least one smoke exhaust outlet 23 is lower than the smoke outlet 4.

[0034] During operation, the smoke exhaust port 23 is covered by the cover body 2 to prevent dust and rain, and the smoke generated by the gas water heater enters the smoke exhaust chamber 3 through the smoke outlet 4 and is finally discharged outward through the smoke exhaust port 23 on the side cover 22, ensuring normal smoke exhaust of the gas water heater.

[0035] The improvement of the present application is that a buffer structure 5 is provided at the bottom end of the top cover 21, and the buffer structure 5 has a guide surface 51 aligned with the smoke outlet 4, and the guide surface 51 is connected to the bottom end of the top cover 21 to adjust the smoke flow path and guide and buffer the smoke. By providing the buffer structure 5 and using the guide surface 51 to adjust the smoke flow path of the smoke outlet 4 and buffer the smoke, the direct collision between the smoke and the top cover 21 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 5 includes a guide body 52 arranged at the bottom of the top cover 21, and the guide body 52 is configured to guide the flow of fluid. The end of the guide body 52 close to the smoke outlet, that is, the top of the guide body points to the smoke outlet 4, and the side of the guide body 52 gradually expands from the end of the guide body 52 close to the smoke outlet 4 and continuously extends to the bottom end of the top cover 21, and the above-mentioned guide surface 51 is formed along this side. Through the above-mentioned technical solution, during the smoke exhaust process, the top of the guide body 52 can first bear the impact of the smoke from the smoke outlet 4, and through the structure of the gradually expanding and extending side of the guide body 52, 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 52 to the top cover 21, playing a buffering role, so that the smoke can be discharged more smoothly through the smoke outlet 23 of the side cover 22, thereby improving the smoke exhaust efficiency.

[0037] Of course, the shapes and formation methods of the guide body 52 and the guide surface 51 are diverse. In addition to the above-mentioned implementation structure, the guide body 52 can also be a hemispherical structure or other shape structures that can play the same guiding role. Correspondingly, the guide surface 51 is also a hemispherical surface or other shapes. In this implementation case, the guide body 52 is specifically designed as a conical structure, and the guide surface 51 is designed as a conical surface formed on the side of the guide body 52. ​​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 4, making the flow path of the smoke clearer. Especially when the gas water heater is working at high power, the guide body 52 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 52 on the smoke, in this embodiment, the buffer structure 5 also includes a first guide arc surface 53, the first guide arc surface 53 is closed around the guide body 52, the inner end of the first guide arc surface 53 is connected to the top of the guide surface 51 with a downward curvature, and the outer end of the first guide arc surface 53 is connected to the bottom surface of the top cover 21 with an upward curvature. By setting the first guide arc surface 53, the inner and outer ends of the first guide arc surface 53 are connected to the "guide surface 51" and the "bottom surface of the top cover 21" with a continuous curvature, which ensures that the smoke can more smoothly transition from the guide body 52 to the top cover 21 after flowing along the guide surface 51, reducing the smoke flow resistance while reducing the direct collision between the smoke and the top cover 21, ensuring the continuous flow of the smoke.

[0039] Furthermore, in order to make the smoke transition from the bottom surface of the top cover 21 to the side cover 22 more smoothly, in this embodiment, the bottom edge of the top cover 21 is connected with a second guide arc surface 54, and the second guide arc surface 54 extends continuously from the bottom edge of the top cover 21 to connect the top of the side cover 22. During operation, the smoke flowing through the top cover 21 can smoothly transition to the side cover 22 along the second guide arc surface 54, instead of directly hitting the side cover 22, reducing the flow resistance of the smoke and the possibility of vortex formation, and improving the smoothness and efficiency of smoke exhaust.

[0040] Of course, the formation implementation structure of the flow guide 52 is diverse. In this implementation case, the flow guide 52 is formed as an integral body by a downward depression at the bottom of the top cover 21. The one-piece molding design can not only simplify the smoke exhaust hood structure, but also reduce the interface between the flow guide 52 and the top cover 21, which is conducive to obtaining a smoother and smoother smoke flow path and improving the buffering and diversion effect of the flow guide 52.

[0041] In addition, in order to improve the versatility of the buffer structure 5, this embodiment provides another embodiment structure for forming the flow guide 52: the flow guide 52 can be detachably connected to the bottom end of the top cover 21 by bolts, buckles, slots, bonding, etc., and the first flow guide arc surface 53 is integrally formed at the bottom end of the side of the flow guide 52 and abuts against the bottom surface of the top cover 21. By detachably connecting the flow guide 52 to the top cover 21, the manufacturer is allowed to assemble flow guides 52 of different specifications according to parameters such as product exhaust power without changing the size structure of the cover body 2 during the actual production process, thereby improving the versatility of the buffer structure 5.

[0042] However, the design of arranging a buffer structure 5 and a guide surface 51 in the smoke exhaust chamber 3 in this embodiment solves the technical problem of the collision between the smoke and the top cover 21 and improves the smoothness of smoke exhaust, but it also produces corresponding disadvantages. For example, the gas used to generate heat in the current gas water heater is usually natural gas or liquefied petroleum gas (LPG). During the combustion process, water vapor is generated, and the water vapor is discharged from the smoke outlet 4 together with the smoke. During the smoke exhaust process, after the smoke contacts the smoke exhaust chamber 3, it is easy to condense on the inner wall of the smoke exhaust chamber 3 to form liquid water. Since the smoke outlet 4 extends out of the installation surface 1, its port height is higher than the installation surface 1. The liquid water condensed on the inner wall of the smoke exhaust chamber 3 will flow down to the installation surface 1, and flows out of the smoke exhaust cavity 3 through the gap between the mounting surface 1 and the side cover 22, or accumulates and rises to the smoke exhaust port 23 at the lowest position of the side cover 22, and is discharged from the smoke exhaust cavity 3 through the smoke exhaust port 23, so that the condensed water does not return to the smoke outlet 4. Since the guide body 52 and the guide surface 51 are provided in this embodiment, the guide surface 51 is aligned with the smoke outlet 4 for the purpose of guide, so that the liquid water can easily flow to the guide body 52 under the action of its own gravity, converge along the guide surface 51 and finally drip into the smoke outlet 4 along the tip of the guide body 52, thereby causing water accumulation inside the flue, increasing the risk of flue corrosion, affecting the normal discharge of smoke, and causing poor smoke exhaust or backflow.

[0043] refer to Figure 5 In order to solve the above technical problems, another improvement of the present embodiment is that a water removal structure 6 is also provided in the smoke exhaust chamber 3, and the water removal structure 6 is connected to the bottom end of the guide surface 51, that is, the tip of the conical structure of the guide body 52, and is used to drain the condensed water formed on the surface of the guide body 52 to prevent the condensed water from entering the smoke outlet 4.

[0044] The first implementation structure of the water removal structure 6: the water removal structure 6 includes a water absorption rope 61 passed through the cover body 2, and the front and rear ends of the water absorption rope 61 are respectively a water absorption end 611 and a water discharge end 612, the water absorption end 611 of the water absorption rope 61 extends into the smoke exhaust chamber 3, and extends along the inner wall of the cover body 2 to be connected to the bottom end of the guide surface 51, and the water discharge end 612 of the water absorption rope 61 passes through the cover body 2 and hangs downward. When the gas water heater is working, the water vapor in the flue gas condenses to form water droplets after contacting the bottom of the top cover 21. The water droplets contact the guide body 52 and flow along the guide surface 51 and finally gather at the bottom end of the guide surface 51, that is, the tip of the conical structure of the guide body 52. ​​Since the water absorption end 611 extends along the inner wall of the cover body 2 and is connected to the bottom end of the guide surface 51, it can absorb these condensed water in time. As the water absorption rope 61 continuously accumulates and absorbs condensed water, the moisture in the water absorption rope 61 will flow along the length direction of the water absorption rope 61, and finally drip out of the cover body 2 through the drainage end 612 of the water absorption rope 61, so that the condensed water on the guide surface 51 can be continuously absorbed to prevent the condensed water on the guide surface 51 from falling into the smoke outlet 4. In actual use, a single strand or multiple strands of water absorption rope 61 can be set according to the drainage efficiency requirements.

[0045] There are various ways to connect the water-absorbing rope 61 to the bottom of the guide surface 51. For example, the water-absorbing rope 61 can be bonded to the inner wall of the cover body 2 and / or the guide body 52 by bonding. In this embodiment, a plurality of fixing plates 62 are provided on the guide body 52 and the inner wall of the cover body 2. The fixing plates 62 fit the guide body 52 and the inner wall of the cover body 2 to form a positioning hole for the water-absorbing rope 61 to be inserted and positioned. The water-absorbing rope 61 can be detachably inserted into the positioning hole to be positioned and connected to the bottom of the guide surface 51. Through the above technical solution, the positioning hole is formed by setting the fixing plate 62, and the water-absorbing rope 61 can be detachably inserted into the positioning hole for positioning, which not only realizes the stable connection between the water-absorbing rope 61 and the bottom of the guide surface 51, but also is easy to install, which is convenient for better disassembly of the water-absorbing rope 61 in the later stage, reduces maintenance costs, and has strong versatility and adaptability. The fixing plate 62 can be connected to the guide body 52 and the inner wall of the cover body 2 by fasteners such as screws or welding.

[0046] In this embodiment, the water-absorbing rope 61 is made of a water-absorbing material, such as cotton thread or TPE (toughened modified polypropylene). The principle of water absorption and drainage of the water-absorbing rope 61 is relatively complicated, and is the result of the combined action of multiple factors (capillary phenomenon, cohesive force, surface tension and gravity). Specifically, when one end of the rope is immersed in water, water molecules rise along the gaps and pores inside the rope under the action of capillary force; at the same time, under the action of surface tension, water molecules form a layer of water film on the surface of the rope and expand along the surface of the rope, so that they can move along the length direction of the water-absorbing rope 61. In addition, since the drainage end 612 extends out of the cover body 2 and hangs downward, the water molecules that move out of the cover body 2 will accelerate toward the drainage end 612 under the action of their own gravity, and finally be discharged from the water-absorbing rope 61.

[0047] refer to Figure 6 In addition to the above-mentioned water-absorbing rope 61, this embodiment case also provides another embodiment structure of the water removal structure 6: the water removal structure 6 includes a drainage rod 63 and a drain port 64 arranged on the cover body 2, the drain port 64 is positioned below the guide surface 51, one end of the drainage rod 63 is connected to the bottom end of the guide surface 51, that is, the tip of the conical structure of the guide body 52, and the other end of the drainage rod 63 extends obliquely downward to the drain port 64 and is connected to the drain port 64, so as to drain the condensed water gathered at the bottom end of the guide surface 51 into the drain port 64. When the gas water heater is working, the water vapor in the flue gas condenses to form water droplets after contacting the bottom of the top cover 21. When the water droplets contact the guide body 52 and flow along the guide surface 51 and finally gather at the bottom end of the guide surface 51, since the guide rod 63 is provided to connect the bottom end of the guide surface 51 and the drain outlet 64, the gathered condensed water will quickly flow to the surface of the guide rod 63 and flow along the surface of the guide rod 63 under the action of surface tension and adsorption force, and finally flow into the drain outlet 64 and be discharged from the smoke exhaust chamber 3 through the drain outlet 64, thereby preventing the condensed water droplets on the guide surface 51 from falling into the smoke outlet 4.

[0048] In this embodiment, the drain outlet 64 is the smoke exhaust outlet 23 which is arranged on the side cover 22 and has a height lower than the bottom end of the guide surface 51. In this way, there is no need to set up an additional drain outlet 64, which can simplify the structure. Moreover, since the smoke and condensed water are discharged through the smoke exhaust outlet 23, the condensed water on the guide rod 63 can be accelerated during the smoke exhaust process by the smoke airflow flowing through the smoke exhaust outlet 23, thereby speeding up the discharge of the condensed water.

[0049] The implementation structures of the above two water removal structures 6 each have their own advantages and disadvantages. For example, although the drainage effect of the water absorption rope 61 is lower than that of the drainage rod 63, compared with the drainage rod 63, since the water absorption rope 61 is closely connected to the guide body 52 and the inner wall of the cover body 2, and is arranged along the flow path of the flue gas, it will not cause a large obstruction to the flue gas discharged from the smoke outlet 4. Therefore, in the actual production process, the corresponding water removal structure 6 can be selected according to the working condition and specific model of the gas water heater.

[0050] Implementation case 2:

[0051] refer to Figure 1 A gas water heater for outdoor use includes a casing 7, in which a burner, a heat exchanger and a smoke collecting device are arranged, and also includes a smoke exhaust hood structure as in implementation case 1, wherein a mounting surface 1 and a smoke outlet 4 of the smoke exhaust hood structure are formed on the casing 7.

[0052] 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 fume hood structure, characterized in that: include: A mounting surface (1) having a smoke outlet (4) disposed thereon; A cover body (2) is connected to the mounting surface (1), and comprises a side cover (22) and a top cover (21) aligned with the smoke outlet; the top end of the side cover (22) is enclosed and connected to the edge of the top cover (21), and the bottom end of the side cover (22) is enclosed and connected to the mounting surface (1); the top cover (21), the side cover (22) and the mounting surface (1) cooperate to form a smoke exhaust cavity (3) connected to the smoke outlet (4); the side cover (22) is provided with a plurality of smoke exhaust outlets (23); The buffer structure (5) has a guide surface (51) aligned with the smoke outlet (4), wherein the guide surface (51) is connected to the bottom end of the top cover (21) and is used to guide and buffer the smoke discharged from the smoke outlet (4).

2. The smoke exhaust hood structure according to claim 1, characterized in that: The buffer structure (5) comprises a flow guide (52) arranged at the bottom end of the top cover (21); the flow guide (52) is configured to guide the flow of fluid, with its top end pointing to the smoke outlet (4), and the side surface of the flow guide (52) gradually expands from one end close to the smoke outlet (4) and continuously extends to the bottom end of the top cover (21), and the flow guide surface (51) is formed along this side surface.

3. The smoke exhaust hood structure according to claim 2, characterized in that: The buffer structure (5) further comprises a first flow-guiding cambered surface (53), the first flow-guiding cambered surface (53) surrounding the flow-guiding body (52) in a closed loop; the inner end curvature of the first flow-guiding cambered surface (53) is continuously connected to the top end of the flow-guiding surface (51), and the outer end curvature is continuously connected to the bottom end of the top cover (21).

4. The smoke exhaust hood structure according to claim 2, characterized in that: The bottom edge of the top cover (21) is surrounded by a second guide arc surface (54), and the second guide arc surface (54) extends continuously from the bottom edge of the top cover (21) to connect to the top of the side cover (22).

5. The smoke exhaust hood structure according to claim 3, characterized in that: The bottom of the top cover (21) is recessed downward to integrally form the flow guide (52).

6. The smoke exhaust hood structure according to claim 3, characterized in that: The flow guide (52) is detachably connected to the bottom of the top cover (21), and the first flow guide arc surface (53) is integrally formed at the bottom end of the side surface of the flow guide (52).

7. The smoke exhaust hood structure according to any one of claims 1 to 6, characterized in that: A water removal structure (6) is provided in the smoke exhaust chamber (3), and the water removal structure (6) is connected to the bottom end of the guide surface (51) and is used to drain condensed water formed on the surface of the guide surface (51) to prevent the condensed water from entering the smoke outlet (4).

8. The smoke exhaust hood structure according to claim 7, characterized in that: The water removal structure (6) comprises a water absorption rope (61) which is passed through the cover body (2); the water absorption rope (61) has a water absorption end (611) and a water discharge end (612); the water absorption end (611) extends into the smoke exhaust cavity (3), and the water absorption end (611) extends along the inner wall of the cover body (2) and is connected to the bottom end of the guide surface (51), and the water discharge end (612) passes through the cover body (2) and is positioned below the water absorption end (611).

9. The smoke exhaust hood structure according to claim 7, characterized in that: The water removal structure (6) comprises a drainage rod (63) and a drainage port (64) arranged on the cover body (2), wherein the drainage port (64) is positioned below the guide surface (51); one end of the drainage rod (63) is connected to the bottom end of the guide surface (51), and the other end of the drainage rod (63) extends obliquely to the drainage port (64) and is in communication with the drainage port (64).

10. An outdoor gas water heater, characterized in that: It comprises a casing (7) in which a burner, a heat exchanger and a smoke collecting device are arranged, and also comprises a smoke exhaust hood structure as claimed in any one of claims 1 to 9, wherein the mounting surface (1) and the smoke outlet (4) are formed on the casing (7).

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