Smoke exhaust device and gas water heater

Abstract

The utility model belongs to the technical field of water heaters, and particularly discloses a smoke exhaust device and a gas water heater. The smoke exhaust device comprises a draught fan and further comprises a smoke collecting hood connected to the draught fan, a smoke collecting cavity is formed in the smoke collecting hood, a groove extending towards the interior of the smoke collecting cavity is formed in the top wall of the smoke collecting hood, a center shaft of the groove is located on the left side of the center shaft of the smoke collecting hood, a smoke baffle is formed on the bottom wall of the groove, and the smoke baffle is obliquely arranged upwards from left to right. The smoke baffle is provided with a first smoke outlet, and the first smoke outlet is communicated with an air inlet of the fan. According to the smoke exhaust device and the gas water heater, through the arrangement, the smoke exhaust uniformity is improved, the working noise is reduced, and the requirement for compact layout of the structure of the gas water heater is met.

Description

Technical Field

[0001] This utility model relates to the field of water heater technology, and in particular to a flue gas exhaust device and a gas water heater. Background Technology

[0002] A gas water heater is a gas appliance that uses gas as fuel to heat water by transferring heat to cold water flowing through a heat exchanger. Existing technology provides a forced-draft gas water heater with a fan located at the top. A fume hood is located below the fan, and the fan draws in the flue gas generated in the combustion chamber and exhausts it outdoors. To save vertical space, the fan is horizontally positioned; simultaneously, to save lateral dimensions, the fan's air inlet is offset to one side of the fume hood, and its exhaust outlet is offset to the other side, connecting to the fan's exhaust duct. To correspond with the offset air inlet, the exhaust port of the fume hood is also offset to one side relative to the central axis, resulting in uneven smoke exhaust within the fume hood. The fan near the exhaust port has a stronger suction force and the flue gas flows faster, while the flue gas on the side of the fume hood that is offset from the exhaust port is not discharged smoothly and flows slower, which in turn affects combustion efficiency and increases the CO content in the exhaust gas. Moreover, the flue gas on the side of the fume hood that is offset from the exhaust port is more likely to generate noise due to the greater exhaust resistance, which affects the user's experience of using the gas water heater. Utility Model Content

[0003] The first technical problem solved by this utility model is to provide a smoke exhaust device that can solve the problems of uneven combustion, high CO content in the smoke, and high operating noise caused by poor smoke exhaust when the air inlet of the existing gas water heater is biased to one side of the smoke collection hood.

[0004] The second technical problem solved by this utility model is to provide a gas water heater with a smoke exhaust device that can improve the smoothness of smoke exhaust by the smoke collection hood with the air inlet offset, reduce the operating noise of the gas water heater, and improve the user experience.

[0005] The first technical problem mentioned above is solved by the following technical solution:

[0006] A smoke exhaust device is provided, including a fan. The smoke exhaust device further includes a smoke collection hood connected to the fan. The smoke collection hood has a smoke collection chamber inside. The top wall of the smoke collection hood has a groove extending toward the smoke collection chamber. The central axis of the groove is located to the left of the central axis of the smoke collection hood. The bottom wall of the groove forms a smoke baffle. The smoke baffle is inclined upward in a left-to-right direction. The smoke baffle has a first smoke exhaust port, which is connected to the air inlet of the fan.

[0007] Compared with the prior art, the smoke exhaust device of this utility model has the following advantages: The smoke collection hood of the smoke exhaust device has a groove extending into the smoke collection chamber on its top wall. The central axis of the groove is located to the left of the central axis of the smoke collection hood, that is, the central axis of the groove is offset to the side of the central axis of the smoke collection hood to correspond to the air inlet of the fan, which is also offset. A smoke baffle is formed on the bottom wall of the groove, and the smoke baffle is inclined upwards from left to right. The smoke baffle has a first smoke exhaust port, which is connected to the air inlet of the fan. The inclined smoke baffle changes the flow direction of the smoke, increases the angle at which the smoke enters the first smoke exhaust port, reduces the vortex area generated due to the small angle, and thus reduces the flow resistance of the smoke in the area near the first smoke exhaust port. Furthermore, because the smoke baffle is angled, the left side of the baffle near the edge of the smoke hood is lower, increasing the resistance to flue gas flow in that area of ​​the smoke collection chamber and reducing the flue gas velocity. Conversely, the right side of the baffle, being an upward-sloping side, reduces the resistance to flue gas emission in that area, thereby increasing the flue gas velocity near the central axis of the smoke collection hood. This results in a more uniform flue gas velocity within the smoke collection chamber, increasing the uniformity of flue gas emission throughout the entire chamber, avoiding any impact on combustion efficiency, ensuring more complete combustion of the gas, and reducing the CO content in the flue gas. Moreover, some of the flue gas in the smoke collection chamber changes its path during flow, entering the groove through the first exhaust port and flowing to the fan inlet through the groove's outlet. Along the flue gas flow path, the cross-sectional areas of the smoke collection chamber, the groove, and the fan volute cavity are different, forming a multi-chamber silencer. Sound waves are reflected and attenuated at the abrupt changes in cross-sectional area of ​​different chambers, achieving the purpose of reducing the operating noise of the exhaust device. The groove offset from the central axis of the smoke hood and the smoke baffle formed by its bottom wall not only meet the requirements of a compact layout for the smoke exhaust device, but also reduce the operating noise of the smoke exhaust device.

[0008] In one embodiment, the center of the first smoke outlet is located to the right of the central axis of the smoke baffle; and / or,

[0009] The edge of the groove forms a second smoke vent. The radius of the first smoke vent is R1, the radius of the second smoke vent is R2, and the offset distance between the center of the first smoke vent and the center of the second smoke vent is S, where 0≤S≤R2-R1.

[0010] In one embodiment, a guide ring is provided around the periphery of the first smoke outlet, and the guide ring extends upward toward the side away from the smoke collection chamber.

[0011] In one embodiment, the guide ring is a guide flange formed by bending the periphery of the first smoke outlet toward the upper side away from the smoke collection chamber.

[0012] In one embodiment, the right side of the guide ring extends into the volute of the fan via the air inlet; and / or,

[0013] The left side of the guide ring is located below the top wall.

[0014] In one embodiment, the right side of the smoke baffle is connected to the top wall.

[0015] In one embodiment, the line connecting the right side of the smoke baffle to the top wall is a straight line, which extends along the width direction of the top wall.

[0016] In one embodiment, the edge of the groove forms a second smoke vent, which is coaxially arranged with the air inlet.

[0017] In one embodiment, the fan includes a volute and an impeller disposed within the volute. The smoke exhaust device further includes a smoke exhaust connecting pipe. The impeller is disposed at the air inlet. The air inlet and the air outlet of the fan are located at the lower end cover and the upper end cover of the volute, respectively, and the air inlet and the air outlet do not overlap. The air outlet is connected to the smoke exhaust connecting pipe.

[0018] In one embodiment, a positioning structure is provided between the top wall and the fan. The positioning structure is distributed around the periphery of the groove. The positioning structure includes a positioning protrusion and a positioning groove that are interlocked. The positioning protrusion is provided on one of the top wall and the fan, and the positioning groove is provided on the other of the top wall and the fan.

[0019] In one embodiment, the angle between the smoke baffle and the horizontal plane is 10° to 63°.

[0020] The second technical problem mentioned above is solved by the following technical solution:

[0021] A gas water heater is provided, comprising a flue gas exhaust device, a burner, and a heat exchanger as described in any of the above embodiments. The flue gas exhaust device, the heat exchanger, and the burner are connected sequentially from top to bottom. The flue gas inlet of the heat exchanger is connected to the combustion chamber of the burner, and the flue gas outlet of the heat exchanger is connected to the flue gas inlet of the smoke collection hood.

[0022] Compared with the prior art, the gas water heater of this utility model has the following advantages: The gas water heater, through the groove offset from the central axis of the smoke collection hood in the aforementioned exhaust device, and the smoke baffle formed by its bottom wall, achieves the effect of concentrating the flue gas for central discharge, making the flue gas flow velocity in the smoke collection chamber more uniform, increasing the uniformity of flue gas discharge, making the gas combustion more complete, and reducing the CO content in the flue gas. Furthermore, as the flue gas in the smoke collection chamber changes its path and enters the groove during flow, the sound waves are reflected and attenuated at the abrupt changes in the cross-section of different chambers, achieving the effect of reducing the operating noise of the exhaust device, improving the user's experience of using the gas water heater, and simultaneously meeting the requirement of a compact structural layout for the gas water heater.

[0023] In one embodiment, the heat exchanger is disposed at the top of the combustion chamber, the axis of the first exhaust port and the central axis of the smoke hood intersect above the center of the combustion chamber, and the intersection point is located below the heat exchanger. Attached Figure Description

[0024] Figure 1 A structural cross-sectional view of a gas water heater provided in an embodiment of this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the smoke collection hood provided in an embodiment of the present utility model;

[0026] Figure 3 A cross-sectional view of the smoke hood provided in an embodiment of this utility model from one perspective;

[0027] Figure 4 A cross-sectional view of the smoke hood provided in an embodiment of this utility model from another perspective;

[0028] Figure 5 This is a structural schematic diagram of a gas water heater provided in an embodiment of the present utility model.

[0029] Label Explanation:

[0030] 11. Burner; 111. Combustion chamber; 12. Heat exchanger; 2. Fan; 21. Volute; 211. Air inlet; 212. Air outlet; 22. Impeller; 3. Smoke hood; 31. Top wall; 311. Positioning groove; 32. Groove; 321. Smoke baffle; 3211. First smoke outlet; 322. Guide ring; 323. Second smoke outlet; 33. Smoke collection chamber; 34. Side panel; 341. Installation notch; 4. Smoke exhaust connection pipe;

[0031] 100. Water heater casing. Detailed Implementation

[0032] 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.

[0033] In the description of this application, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "bottom", "inner", "outer", 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.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0035] 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.

[0036] like Figures 1-4 As shown, this utility model embodiment first provides a smoke exhaust device for a forced-draft gas water heater. The smoke exhaust device includes a fan 2, which includes a volute 21 and an impeller 22 disposed within the volute 21. An air inlet 211 is provided on the volute 21. The shaft of the impeller 22 and the central shaft of the air inlet 211 are coaxially arranged, forming a horizontally arranged structure for the impeller 22. The impeller 22 generates a suction force acting on the flue gas. To save lateral dimensions, the air inlet 211 is offset to one side of the smoke exhaust device. For ease of explanation, exemplarily, the side where the air inlet 211 is offset is defined as the left side of the smoke exhaust device.

[0037] The smoke exhaust device also includes a smoke hood 3 connected to the fan 2. The smoke hood 3 has a smoke collection chamber 33 inside. The top wall 31 of the smoke hood 3 has a groove 32 extending toward the smoke collection chamber 33. The central axis of the groove 32 is located to the left of the central axis of the smoke hood 3. The bottom wall of the groove 32 forms a smoke baffle 321. The smoke baffle 321 is inclined upward in a direction from left to right. The smoke baffle 321 has a first smoke exhaust port 3211. The first smoke exhaust port 3211 is connected to the air inlet 211 of the fan 2.

[0038] The smoke exhaust device provided in this embodiment of the utility model has a smoke collection hood 3 with a groove 32 extending into the smoke collection chamber 33 on its top wall 31. The central axis of the groove 32 is located to the left of the central axis of the smoke collection hood 3, that is, the central axis of the groove 32 is offset to the side of the central axis of the smoke collection hood 3 to correspond to the air inlet 211 of the fan 2, which is also offset. The bottom wall of the groove 32 forms a smoke baffle 321, which is inclined upward from left to right. The smoke baffle 321 has a first smoke exhaust port 3211, which is connected to the air inlet 211 of the fan 2. The inclined smoke baffle 321 changes the flow direction of the smoke, increases the angle at which the smoke enters the first smoke exhaust port 3211, reduces the vortex area generated due to the small angle, and thus reduces the flow resistance of the smoke in the area near the first smoke exhaust port 3211. Furthermore, since the smoke baffle 321 is inclined, the left side of the smoke baffle 321 near the edge of the smoke hood 3 is relatively sunken, which increases the resistance to flue gas flow in this area of ​​the smoke collection chamber 33 and reduces the flue gas velocity. Correspondingly, the right side of the smoke baffle 321, as the upward inclined side, reduces the flue gas emission resistance in this area, which in turn increases the flue gas velocity in the area near the central axis of the smoke collection hood. This makes the flue gas velocity in the smoke collection chamber 33 more uniform, increases the uniformity of flue gas emission in the entire smoke collection chamber 33, avoids affecting combustion efficiency, makes the gas combustion more complete, and reduces the CO content in the flue gas. Furthermore, some of the flue gas in the smoke collection chamber 33 changes its path during flow, entering the groove 32 through the first exhaust port 3211, and then flowing to the air inlet 211 of the fan 2 through the outlet of the groove 32. Along the flue gas flow path, the cross-sectional areas of the smoke collection chamber 33, the groove 32, and the volute cavity of the fan 2 are different, forming a multi-chamber sound-absorbing structure. Sound waves are reflected and attenuated at the abrupt changes in cross-section of different chambers, achieving the purpose of reducing the operating noise of the smoke exhaust device. The groove 32, offset from the central axis of the smoke collection hood 3, and the smoke baffle 321 formed by its bottom wall, simultaneously satisfy the compact layout of the smoke exhaust device structure and reduce the operating noise of the smoke exhaust device.

[0039] The angle between the smoke baffle 321 and the horizontal plane is 10° to 63°, and can be set according to the smoke exhaust parameters required by the smoke exhaust device. For example, the angle between the smoke baffle 321 and the horizontal plane can be set to 10°, 20°, 50°, 63°, etc. This embodiment will not list them all. The larger the inclination angle of the smoke baffle 321, the more conducive it is to guiding the smoke to flow rapidly towards the central axis of the smoke collection hood 3.

[0040] The center of the first smoke outlet 3211 is located to the right of the central axis of the smoke baffle 321. The first smoke outlet 3211 is offset relative to the central axis of the smoke baffle 321 towards the central axis of the smoke collection hood 3, so as to be as close as possible to the central axis of the smoke collection hood 3. In this way, since the first smoke outlet 3211 is located on the right side of the smoke baffle 321 near the central axis of the smoke collection hood 3, the suction force in the area near the first smoke outlet 3211 is relatively large. This can guide the smoke to gather towards the central axis area of ​​the smoke collection hood 3, achieving the effect of gathering the smoke and discharging it as centrally as possible.

[0041] The edge of the groove 32 forms a second smoke outlet 323. The radius of the first smoke outlet 3211 is R1, and the radius of the second smoke outlet 323 is R2. The offset distance between the center of the first smoke outlet 3211 and the center of the second smoke outlet 323 is S, where 0 ≤ S ≤ R2 - R1. The center of the second smoke outlet 323 coincides with the central axis of the groove 32. When the center of the first smoke outlet 3211 and the center of the second smoke outlet 323 coincide, S = 0, and at this time, the first smoke outlet 3211 is not offset relative to the central axis of the groove 32. The maximum offset of the center of the first smoke outlet 3211 is R2 - R1. At this time, the first smoke outlet 3211 is offset to the right of the central axis of the groove 32, and the center of the first smoke outlet 3211 is closest to the central axis of the smoke collection hood 3. Figure 4 As shown in Figure S, the center of the first exhaust port 3211 is located to the right of the center of the second exhaust port 323.

[0042] A guide ring 322 is provided around the periphery of the first smoke outlet 3211, extending upwards away from the smoke collection chamber 33. The guide ring 322, extending in the direction of smoke flow, further enhances the guiding effect on the smoke. As the smoke flows along the guide ring 322, the flow resistance in the vicinity of the first smoke outlet 3211 is reduced, further concentrating the smoke within the smoke collection chamber 33 towards its central axis, thus achieving the effect of concentrating the smoke for emission as centrally as possible.

[0043] In one embodiment, the guide ring 322 is a guide flange formed by bending the periphery of the first smoke outlet 3211 toward the side away from the smoke collection chamber 33. The processing technology of the guide ring 322 is relatively simple. The guide ring 322 can be formed by stamping and bending the periphery of the first smoke outlet 3211 using common sheet metal processing equipment.

[0044] In one embodiment, the guide ring 322 extends into the volute 21 of the fan 2 via the air inlet 211 on the right side near the central axis of the smoke hood 3. The extended guide ring 322 can better guide the flue gas, reduce the flue gas flow resistance in the area near the central axis of the smoke hood 3, and cause the flue gas in other areas with greater emission resistance in the smoke collection chamber 33 to gather there and quickly enter the volute 21 of the fan 2 along the guide ring 322.

[0045] The guide ring 322 is located on the left side away from the central axis of the smoke hood 3, below the top wall 31. This facilitates the guidance of the smoke in the smoke collection chamber 33 through the lower-height guide ring 322 into the groove 32, ensuring that the flow path of the smoke passes through the groove 32, thereby improving the reliability of the multi-chamber silencer structure.

[0046] The edge of the groove 32 forms a second smoke exhaust port 323. The second smoke exhaust port 323 and the air inlet 211 are coaxially arranged. The groove 32 is directly opposite the air inlet 211 of the fan 2, which increases the smoothness of the flue gas in the groove 32 entering the air inlet 211 through the second smoke exhaust port 323, making better use of the suction force of the fan 2, and avoiding the smoke collection hood 3 from blocking the air inlet 211.

[0047] The smoke baffle 321 is connected to the top wall 31 on the right side near the central axis of the smoke hood 3, while other areas of the smoke baffle 321 are connected to the side wall of the groove 32. Smoke enters the groove 32 from the smoke collection chamber 33, and ultimately flows through the second smoke outlet 323 of the groove 32 to the air inlet 211. The direct connection between the smoke baffle 321 and the top wall 31 on the right side near the central axis of the smoke hood 3 creates a smooth transition between the smoke baffle 321 and the top wall 31, facilitating a rapid flow of smoke from the connection point to the air inlet 211 and reducing the flow resistance of the side wall of the groove 32.

[0048] The connection line between the smoke baffle 321 and the top wall 31 on the right side near the central axis of the smoke hood 3 is a straight line, extending along the width direction of the top wall 31. This straight line, extending along the width direction of the top wall 31, increases the length of the connection between the smoke baffle 321 and the top wall 31. On the one hand, this further increases the flow velocity of the flue gas flowing from the groove 32 to the air inlet 211 in the connection line area. On the other hand, it forms a clearance area at the connection line, reducing the area occupied by the second smoke outlet 323 on the top wall 31. Other areas of the top wall 31 are used to arrange other structural components, such as the positioning structure between the top wall 31 and the fan 2.

[0049] To position the fan 2 and ensure that the second smoke outlet 323 and the air inlet 211 are coaxially aligned, a positioning structure is provided between the top wall 31 and the fan 2. This positioning structure is distributed around the periphery of the groove 32 and includes a positioning protrusion and a positioning groove 311 that interlock. The positioning protrusion is located on one of the top wall 31 and the fan 2, and the positioning groove 311 is located on the other. For example, in one embodiment, the top wall 31 has a positioning groove 311, and the bottom of the volute 21 has a positioning protrusion. The positioning groove 311 is located around the periphery of the second smoke outlet 323, and the line connecting the smoke baffle 321 to the top wall 31 near the central axis of the smoke hood 3 avoids the positioning groove 311.

[0050] For forced draft gas water heaters, the exhaust system also includes an exhaust connection pipe 4. An impeller 22 is located at the air inlet 211. The air inlet 211 and the air outlet 212 of the fan 2 are located at the lower and upper end covers of the volute 21, respectively. The air inlet 211 and the air outlet 212 do not overlap. The air outlet 212 connects to the exhaust connection pipe 4 to save space in the left-right direction of the exhaust system. (Reference) Figure 1 The air inlet 211 and the air outlet 212 are located on the left and right sides of the central axis of the smoke hood 3, respectively.

[0051] The present invention also provides a gas water heater, such as... Figure 5 As shown, the gas water heater includes a flue gas exhaust device, a burner 11, and a heat exchanger 12 as described in any of the above embodiments. The flue gas exhaust device, heat exchanger 12, and burner 11 are connected sequentially from top to bottom. The flue gas inlet of the heat exchanger 12 is connected to the combustion chamber 111 of the burner 11, and the flue gas outlet of the heat exchanger 12 is connected to the flue gas inlet opening of the smoke collection hood 3. The baffle plate 321 of the flue gas exhaust device is inclined to achieve the effect of concentrating the flue gas and discharging it as centrally as possible, making the flue gas flow velocity in the smoke collection chamber 33 more uniform, increasing the uniformity of flue gas discharge in the entire smoke collection chamber 33, avoiding affecting combustion efficiency, making the gas combustion more complete, and reducing the CO content in the flue gas. Moreover, in the flue gas flow path, the smoke collection chamber 33, the groove 32, and the inner cavity of the fan 2 volute form a multi-chamber sound-absorbing structure to reduce the operating noise of the flue gas exhaust device. The smoke exhaust device, through the groove 32 offset from the central axis of the smoke hood 3 and the smoke baffle 321 formed by the bottom wall, not only satisfies the compact layout of the smoke exhaust device structure, but also reduces the operating noise of the smoke exhaust device, thereby improving the user's experience of using the gas water heater.

[0052] like Figure 5As shown, the gas water heater also includes a water heater housing 100. A flue gas exhaust device is installed inside the water heater housing 100. The air inlet 211 of the fan 2 is offset to one side of the water heater housing 100, and is located to the left of the flue gas exhaust device. The central axis of the groove 32 is located to the left of the central axis of the smoke hood 3, corresponding to the position of the fan 2. The first exhaust port 3211, connecting to the air inlet 211, is opened on the bottom wall of the groove 32. The structure of the flue gas exhaust device is relatively compact, reducing the size occupied in the left-right direction of the water heater housing 100.

[0053] In one embodiment, the heat exchanger 12 is disposed at the top of the combustion chamber 111, and the axis of the first exhaust port 3211 and the central axis of the smoke hood 3 intersect above the center of the combustion chamber 111, with the intersection point located below the heat exchanger 12. Figure 1 and Figure 4 As shown in the figure, the two intersecting dashed lines represent the axis of the first exhaust port 3211 and the central axis of the smoke hood 3, respectively. Angle α in the figure is the angle between the axis of the first exhaust port 3211 and the central axis of the smoke hood 3. The area between the center of the combustion chamber 111 and the heat exchanger 12 is prone to flue gas stagnation. Extending the converging area formed by the axis of the first exhaust port 3211 to above the center of the combustion chamber 111 can effectively guide the flue gas in the combustion chamber 111 to flow and be discharged as quickly as possible.

[0054] To form a stable smoke collection chamber 33, the smoke hood 3 also includes multiple side panels 34 connected to the top wall 31, which together form the smoke collection chamber 33. The side panels 34 are detachably connected to the heat exchanger 12, and the top wall 31 is detachably connected to the fan 2, forming a bottom-up arrangement of the burner 11, heat exchanger 12, smoke hood 3, and fan 2. The top wall 31 and the multiple side panels 34 are integrally formed from sheet metal.

[0055] The side panel 34 is fitted onto the outside of the burner 11. To position the smoke hood 3 and the burner 11, the side panel 34 has elongated protrusions, with corresponding elongated recesses on the side facing the burner 11. The burner 11 has protrusions as positioning structures; the elongated protrusions and the protrusions on the burner 11 engage quickly for positioning, ensuring the reliable positioning of the smoke hood 3 on the burner 11. The side panel 34 and the burner 11 are connected by screws or other fasteners.

[0056] Since the burner 11 is inserted into the smoke hood 3, to avoid a large gap between the side panel 34 and the burner 11 due to arching, an installation notch 341 is provided on the side panel 34. The installation notch 341 extends from the edge of the side panel 34 away from the top wall 31 toward the top wall 31. The installation notch 341 can shrink or split to improve the dimensional compatibility between the smoke hood 3 and the burner 11, thereby reducing the gap between the side panel 34 and the burner 11, improving the sealing performance of the combustion chamber 111, and preventing the flue gas in the combustion chamber 111 from leaking through the gap.

[0057] 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.

[0058] 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. Smoke evacuation device comprising a fan (2), characterized in that, The smoke exhaust device further comprises a smoke collecting hood (3) connected to the fan (2), the smoke collecting hood (3) has a smoke collecting cavity (33) therein, a top wall (31) of the smoke collecting hood (3) has a groove (32) extending towards the smoke collecting cavity (33), a middle axis of the groove (32) is located at a left side of a middle axis of the smoke collecting hood (3), a bottom wall of the groove (32) forms a smoke baffle (321), the smoke baffle (321) is arranged to be inclined upwards along a left-to-right direction, the smoke baffle (321) is provided with a first smoke exhaust port (3211), and the first smoke exhaust port (3211) is communicated with an air inlet (211) of the fan (2).

2. The smoke evacuation device of claim 1, wherein, A center of the first smoke exhaust port (3211) is located at a right side of a middle axis of the smoke baffle (321); and / or, An edge of the groove (32) forms a second smoke exhaust port (323), a radius of the first smoke exhaust port (3211) is R1, a radius of the second smoke exhaust port (323) is R2, and an offset distance between a center of the first smoke exhaust port (3211) and a center of the second smoke exhaust port (323) is S, 0≤S≤R2-R1.

3. The smoke evacuation device of claim 1, wherein, A peripheral edge of the first smoke exhaust port (3211) is provided with a flow guide ring (322), and the flow guide ring (322) extends towards an upper side away from the smoke collecting cavity (33).

4. A smoke extraction device according to claim 3, characterised in that The flow guide ring (322) is a flow guide flange formed by bending a peripheral edge of the first smoke exhaust port (3211) towards the upper side away from the smoke collecting cavity (33).

5. The smoke evacuation device of claim 3, wherein, A right side of the flow guide ring (322) extends into a volute (21) of the fan (2) through the air inlet (211); and / or, A left side of the flow guide ring (322) is located below the top wall (31).

6. The smoke evacuation device of claim 1, wherein, A right side of the smoke baffle (321) is connected to the top wall (31).

7. A smoke extraction device according to claim 6, characterised in that A connection line between the right side of the smoke baffle (321) and the top wall (31) is a straight line, and the straight line extends along a width direction of the top wall (31).

8. A smoke extraction device according to any one of claims 1 to 7, characterised in that, An edge of the groove (32) forms a second smoke exhaust port (323), and the second smoke exhaust port (323) and the air inlet (211) are coaxially arranged.

9. A smoke extraction device according to any one of claims 1 to 7, characterised in that, The fan (2) comprises the volute (21) and an impeller (22) arranged in the volute (21), the smoke exhaust device further comprises a smoke exhaust connecting pipe (4), the impeller (22) is arranged at the air inlet (211), the air inlet (211) and an air outlet (212) of the fan (2) are respectively located at a lower end cover and an upper end cover of the volute (21), the air inlet (211) and the air outlet (212) do not coincide with each other, and the air outlet (212) is communicated with the smoke exhaust connecting pipe (4).

10. A smoke extraction device according to any one of claims 1 to 7, characterised in that, Positioning structures are arranged between the top wall (31) and the fan (2), the positioning structures are distributed on a peripheral side of the groove (32), the positioning structures comprise positioning protrusions and positioning grooves (311) which are mutually inserted and matched, the positioning protrusions are arranged on one of the top wall (31) and the fan (2), and the positioning grooves (311) are arranged on the other one of the top wall (31) and the fan (2).

11. A smoke extraction device according to any one of claims 1 to 7, characterised in that, The included angle between the smoke baffle (321) and the horizontal plane is 10-63°.

12. A gas water heater characterised by, The smoke exhaust device, the burner (11) and the heat exchanger (12) are sequentially connected from top to bottom, the flue gas inlet of the heat exchanger (12) is communicated with the combustion chamber (111) of the burner (11), and the flue gas outlet of the heat exchanger (12) is communicated with the smoke inlet opening of the smoke hood (3).

13. The gas water heater of claim 12, wherein, The heat exchanger (12) is arranged at the top of the combustion chamber (111), the axis of the first smoke exhaust port (3211) and the central axis of the smoke hood (3) intersect above the center of the combustion chamber (111), and the intersection point is below the heat exchanger (12).

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