Fume hoods and gas water heaters

Abstract

This application relates to a fume hood and a gas water heater. The housing includes a smoke inlet, a smoke outlet, and cavities communicating with the smoke inlet and smoke outlet respectively. The smoke inlet is located on the side wall of the housing. A baffle is located within the cavity and rotatably connected to the housing via a pivot for closing or opening the smoke inlet. The smoke inlet extends along the height of the housing, and the pivot is located at a position more than half the distance between the upper and lower edges of the smoke inlet. A first limiting member is located within the cavity to restrict the baffle from fully opening the smoke inlet. In this application, the baffle is connected to the housing via a pivot, with the pivot located more than half the height of the smoke inlet from the lower edge. The baffle's center of gravity is lowered, and under its own weight, it rotates, making it easier to close the smoke inlet. This simplifies the assembly of the baffle with the housing of the fume hood, thereby improving the assembly efficiency of the fume hood.

Description

Technical Field

[0001] This application relates to the field of gas water heater technology, and in particular to a fume hood and a gas water heater. Background Technology

[0002] Outdoor gas water heaters are installed on walls or the ground outdoors, suitable for environments with limited indoor space or where indoor installation is unsuitable. The operation of outdoor gas water heaters is significantly affected by weather conditions, especially the exhaust duct for discharging combustion gases. Because the exhaust hood is located on the front side wall of the water heater casing, and the exhaust port is open and close to the interior, the heat exchanger is exposed to outside air. In standby mode, dust, insects, and other foreign objects in the air can easily float into the water heater, causing blockages and affecting its normal operation over time. Current solutions involve installing a baffle at the exhaust hood's inlet, with the lower side of the baffle rotatably connected to the hood casing via a torsion spring and a rotating shaft. The torsion spring applies elastic force to the baffle to close the inlet. However, the elastic force of the torsion spring makes assembly between the baffle and the hood casing difficult, reducing assembly efficiency. Utility Model Content

[0003] Therefore, it is necessary to provide a fume hood that addresses the above problems. When applied to a gas water heater, it can reduce the entry of foreign objects into the gas water heater, while the assembly between the baffle and the fume hood shell is simple, thereby improving the assembly efficiency of the fume hood.

[0004] On one hand, this application provides a fume hood for a gas water heater, comprising:

[0005] The housing includes a smoke inlet, a smoke outlet, and cavities communicating with the smoke inlet and the smoke outlet respectively, wherein the smoke inlet is located on the side wall of the housing;

[0006] A baffle is disposed in the cavity and rotatably connected to the housing via a rotating shaft for closing or opening the smoke inlet; the smoke inlet extends along the height direction of the housing, and the rotating shaft is located at more than half the distance between the upper and lower edges of the smoke inlet;

[0007] A first limiting member is disposed within the cavity to prevent the baffle from fully opening the smoke inlet.

[0008] When the aforementioned exhaust hood is applied to a gas water heater, during normal operation, the blower opens the baffle, opening the flue gas inlet. Combustion exhaust gases enter the cavity through the inlet and are finally discharged through the exhaust outlet. In severe weather conditions such as hurricanes, when the external wind pressure exceeds the blower's maximum blowing pressure, the baffle closes the flue gas inlet, activating the unit's wind pressure protection function to prevent foreign objects from entering the gas water heater and affecting its lifespan. In the standby state, the baffle is connected to the housing via a pivot located more than halfway between the upper and lower edges of the flue gas inlet. This pivot acts as a fulcrum, separating the upper and lower parts of the baffle. The baffle's center of gravity shifts downwards, and its own weight causes it to rotate, making it easier to close the flue gas inlet and preventing foreign objects from accumulating and clogging the unit, thus affecting its normal operation. Compared to existing... In the previous technology, the lower side of the baffle was rotatably connected to the housing of the exhaust hood via a torsion spring and a rotating shaft. The torsion spring applied an elastic force to the baffle to close the smoke inlet. Compared to the previous exhaust hood, which uses a rotating shaft to allow the baffle to close the smoke inlet by its own weight, the assembly between the baffle and the housing of the exhaust hood is simpler, thus improving the assembly efficiency of the exhaust hood. Furthermore, since this invention lacks the elastic force of the torsion spring, when the gas water heater is operating under a large load, the baffle will completely open the smoke inlet (i.e., the projection of the baffle on the plane of the smoke inlet does not overlap with the smoke inlet). This reduces the exhaust resistance, causing the flue gas to escape too quickly, resulting in a decrease in the heat exchange efficiency of the gas water heater heat exchanger. Therefore, by setting a first limiting member, the baffle is prevented from completely opening the smoke inlet, ensuring that the exhaust resistance meets the heat exchange efficiency requirements of the gas water heater heat exchanger.

[0009] In one embodiment, the first limiting member is fixed to the housing, and the side of the baffle facing away from the smoke inlet is used to abut against the first limiting member; and / or, the first limiting member is fixed to the side of the baffle facing away from the smoke inlet, and the first limiting member is used to abut against the housing.

[0010] In one embodiment, a first rotating sleeve is further included, which is fixed to the upper edge of the baffle along the height direction of the housing; the rotating shaft passes through the first rotating sleeve.

[0011] In one embodiment, a second rotating sleeve is further included, which is fixed to the housing; along the length direction of the housing, the second rotating sleeve and the first rotating sleeve are arranged side by side, and the rotating shaft passes through the first rotating sleeve and the second rotating sleeve. When the baffle rotates, the first rotating sleeve and the second rotating sleeve can rotate relative to each other.

[0012] In one embodiment, the baffle includes a main board and two side boards, the two side boards being respectively disposed on both sides of the main board along its length; the rotating shaft includes a rotating shaft corresponding to the number of side boards; the rotating shaft is fixedly connected to the side boards of the baffle.

[0013] In one embodiment, the housing is provided with a baffle portion surrounding the smoke inlet, the baffle portion is provided with a smoke inlet channel, the inner wall of the smoke inlet channel is provided with a connecting hole, and the rotating shaft is rotatably inserted into the connecting hole.

[0014] In one embodiment, the smoke hood further includes a second limiting member disposed on the housing. When the baffle moves toward closing the smoke inlet, the second limiting member is used to abut against the side of the baffle facing the smoke inlet.

[0015] In one embodiment, there are multiple second limiting members, which are evenly distributed along the length of the housing within the smoke inlet channel.

[0016] In one embodiment, the housing includes a first housing and a second housing, the first housing forming the smoke inlet and the baffle connected to the first housing, the second housing forming the smoke outlet, and the first housing and the second housing enclosing each other to form the cavity.

[0017] A gas water heater includes the aforementioned exhaust hood.

[0018] The aforementioned gas water heater features a fume hood. During normal operation, the blower opens the baffle, allowing combustion gases to enter the chamber and exit through the exhaust hood. In severe weather conditions, such as hurricanes, when the external wind pressure exceeds the blower's maximum pressure, the baffle closes the exhaust hood, activating the unit's wind pressure protection function to prevent foreign objects from entering and affecting the unit's lifespan. In standby mode, the baffle is connected to the housing via a pivot located more than halfway between the upper and lower edges of the exhaust hood. This pivot acts as a fulcrum for operation. The baffle is divided into upper and lower parts, and the center of gravity of the baffle rotates downwards. Under the action of its own weight, the baffle rotates, making it easier to close the smoke inlet and preventing foreign objects from entering the machine and accumulating and blocking it, thus affecting the normal operation of the machine. Compared with the existing technology where the lower side of the baffle is rotatably connected to the shell of the smoke hood through a structure of torsion spring and rotating shaft, and the torsion spring applies elastic force to the baffle to close the smoke inlet, the above smoke hood sets the position of the rotating shaft so that the baffle can close the smoke inlet by its own weight. The assembly between the baffle and the shell of the smoke hood becomes simpler, thereby improving the assembly efficiency of the smoke hood. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the fume hood and water heater in one embodiment of this application.

[0020] Figure 2 This is a schematic diagram of the structure of the smoke hood in Embodiment 1 of this application.

[0021] Figure 3 This is a schematic diagram of the exploded structure of the smoke hood in Embodiment 1 of this application.

[0022] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0023] Figure 5 This is a schematic diagram of the baffle and the first housing in Embodiment 1 of this application.

[0024] Figure 6 This is a cross-sectional schematic diagram of the smoke hood of Embodiment 1 of this application in the open state.

[0025] Figure 7 This is a cross-sectional schematic diagram of the smoke hood of Embodiment 1 of this application in the closed state.

[0026] Figure 8 This is a schematic diagram of the structure of the smoke hood in Embodiment 2 of this application.

[0027] Figure 9 This is a schematic diagram of the baffle and the first housing in Embodiment 2 of this application.

[0028] Figure 10 This is a cross-sectional schematic diagram of the smoke hood in the open state according to Embodiment 2 of this application.

[0029] Figure 11 This is a cross-sectional schematic diagram of the smoke hood of Embodiment 2 of this application in the closed state.

[0030] Explanation of icon numbers:

[0031] 1. Gas water heater; 10. Exhaust hood; 100. Shell; 101. Smoke inlet; 102. Exhaust outlet; 103. Cavity; 110. First shell; 111. Flanged structure; 112. Smoke inlet channel; 113. Second rotating sleeve; 114. Second limiting member; 120. Second shell; 130. Sealing gasket; 200. Baffle; 201. Main board; 202. Side plate; 210. First rotating sleeve; 300. First limiting member; 400a. Rotating shaft; 400b. Rotating shaft. Detailed Implementation

[0032] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0033] In the description of this application, it should be understood that if the terms "length", "height", "upper", and "lower" appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing this application and simplifying the description, and does 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, it should not be construed as a limitation of this application.

[0034] Furthermore, where the terms "first" and "second" appear, these terms are 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 with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] Example 1

[0038] See Figure 1-6 , Figure 1-6 The diagram shows a structural schematic of a smoke hood 10 in one embodiment of this application. The smoke hood 10 provided in one embodiment of this application is mainly applicable to an outdoor gas water heater 1. The smoke hood 10 includes a housing 100, a baffle 200 and a first limiting member 300.

[0039] The housing 100 includes a smoke inlet 101, a smoke outlet 102, and a cavity 103 communicating with the smoke inlet 101 and the smoke outlet 102 respectively. The smoke inlet 101 is located on the side wall of the housing 100. A baffle 200 is located inside the cavity 103 and rotatably connected to the housing 100 via a rotating shaft 400a for closing or opening the smoke inlet 101. The smoke inlet 101 extends along the height direction of the housing 100, and the rotating shaft 400a is located at a position more than half the distance between the upper and lower edges of the smoke inlet 101. A first limiting member 300 is located inside the cavity 103 for limiting the baffle 200 from fully opening the smoke inlet 101. The height direction of the housing 100 is as follows: Figure 2 As shown.

[0040] When the aforementioned exhaust hood 10 is applied to the gas water heater 1, during normal operation of the gas water heater 1, the blower opens the baffle 200, the flue gas inlet 101 opens, and the combustion exhaust gas enters the cavity 103 from the flue gas inlet 101, and finally exits from the exhaust gas outlet 102. In severe weather such as hurricanes, when the external wind pressure exceeds the maximum blower pressure, the baffle 200 closes the flue gas inlet 101, and the entire unit activates its wind pressure protection function to prevent foreign objects from entering the gas water heater 1 and affecting its service life. In the standby state of water heater 1, baffle 200 is connected to housing 100 via pivot 400a. Pivot 400a is located more than halfway between the upper and lower edges of flue gas inlet 101. Thus, with pivot 400a as the fulcrum separating the upper and lower parts of baffle 200, the center of gravity of baffle 200 is lowered. Under its own weight, baffle 200 rotates, making it easier to close flue gas inlet 101 and preventing foreign objects from entering the unit and accumulating and blocking it, thus affecting the normal operation of the unit. Normal operation; compared with the existing technology where the lower side of the baffle is rotatably connected to the smoke hood housing via a torsion spring and a rotating shaft, and the torsion spring applies an elastic force to the baffle to close the smoke inlet, the above-mentioned smoke hood 10, by setting the position of the rotating shaft 400a, allows the baffle 200 to close the smoke inlet 101 by its own weight. The assembly between the baffle 200 and the housing 100 of the smoke hood 10 becomes simpler, thereby improving the assembly efficiency of the smoke hood 10; furthermore, since this utility model lacks a torsion spring... When the gas water heater 1 is operating under a large load, the baffle 200 will fully open the flue gas inlet 101 (i.e., the projection of the baffle 200 on the plane where the flue gas inlet 100 is located does not overlap with the flue gas inlet 101). The decrease in exhaust resistance causes the flue gas to escape too quickly, resulting in a decrease in the heat exchange efficiency of the heat exchanger of the gas water heater 1. Therefore, by setting the first limiting member 300, the baffle 200 is prevented from fully opening the flue gas inlet 101, ensuring that the exhaust resistance meets the heat exchange efficiency requirements of the heat exchanger of the gas water heater 1.

[0041] In this embodiment, the housing 100 includes a first housing 110 and a second housing 120. The first housing 110 forms the smoke inlet 101, and the baffle 200 is connected to the first housing 110. The second housing 120 forms the smoke outlet 102. The first housing 110 and the second housing 120 enclose the cavity 103.

[0042] Specifically, the flue gas inlet 101 is a rectangular opening. The first housing 110 is fixed to the gas water heater 1, and the flue gas inlet 101 of the first housing 110 connects to the flue gas outlet of the gas water heater 1. The first housing 110 has protruding flanged structures 111 around its perimeter. These flanged structures 111 and the flue gas outlet 102 form a sealing area. The main function of this sealing area is to fix the sealing ring, which prevents rainwater from entering the entire unit. When the gas water heater 1 is off or in anti-backdraft protection mode (baffle 200 closes the flue gas outlet 102), the flanged structures 111 and baffle 200 work together to seal the flue gas inlet 101.

[0043] The second housing 120 has a dome-shaped structure, with a central protrusion forming the outer wall of the cavity 103. The second housing 120 has an extending structure around its perimeter. When the second housing 120 is connected to the first housing 110, the extending structure covers at least a portion of the sealing area, such that the first housing 110 and the second housing 120 clamp the fixing sealing ring between them. In this embodiment, the bottom of the second housing 120 is provided with a drainage hole, and the smoke exhaust port 102 is located above the drainage hole, facilitating the timely discharge of accumulated rainwater.

[0044] In this embodiment, the first housing 110, the second housing 120, and the baffle 200 of the housing 100 are made of stainless steel, such as 304 stainless steel. A sealing gasket 130 is also provided between the first housing 110 and the second housing 120. The sealing gasket 130 is annular and surrounds the smoke inlet 101.

[0045] In this embodiment, the first limiting member 300 is fixed to the side of the baffle 200 facing away from the smoke inlet 101, and the first limiting member 300 is used to abut against the housing (100).

[0046] Furthermore, in this embodiment, the first limiting member 300 and the baffle 200 are integrally formed.

[0047] In other embodiments, the first limiting member 300 is fixed to the housing 100, and the side of the baffle 200 facing away from the smoke inlet 101 is used to abut against the first limiting member 300; or the number of the first limiting members 300 is at least two, and at least two first limiting members 300 are respectively provided on the housing 100 and the baffle 200.

[0048] After the second housing 120 is connected to the first housing 110, the baffle 200 and the first limiting member 210 are accommodated in the cavity 103 between the first housing 110 and the second housing 120.

[0049] Because a baffle 200 is installed at the flue gas inlet 101, the exhaust resistance will increase compared to the existing system without a baffle 200 at the flue gas inlet 101. To adapt to the exhaust resistance requirements of the gas water heater under lower loads, the opening area of ​​the flue gas inlet 101 will be larger than that of the existing flue gas inlet without a baffle. When the gas water heater 1 is running, the blower blows up the anti-backdraft baffle 200. The weight of the baffle 200 is limited, and the opening angle of the baffle 200 will vary depending on the blower power and the wind speed. However, when the gas water heater 1 is operating under a higher load... During operation, the baffle 200 will fully open the flue gas inlet 101 (i.e., the projection of the baffle 200 on the plane where the flue gas inlet 101 is located does not overlap with the flue gas inlet 101). The decrease in exhaust resistance causes the flue gas to escape too quickly, resulting in a decrease in the heat exchange efficiency of the gas water heater heat exchanger when it is working under a large load. By setting the first limiting component 300, the baffle is prevented from fully opening the flue gas inlet 101, so as to match the fan power of the gas water heater 1 when it is running under a large load, maintain the exhaust resistance within a reasonable range, and ensure that the exhaust resistance meets the heat exchange efficiency requirements of the gas water heater 1 heat exchanger. Meanwhile, by setting the first limiting component 300, the versatility of the exhaust hood is improved. Regardless of the capacity of the gas water heater 1, the exhaust hood structure of this application can be used. Small-capacity gas water heaters have less flue gas and air volume. With the gravity of the baffle 200 itself, the system's exhaust resistance balance requirement can be met. Large-capacity gas water heaters have a large flue gas volume. When the baffle 200 rotates to the first limiting component 300, it prevents the baffle 200 from fully opening the flue gas inlet 101. This matches the fan power of the gas water heater 1 when it is running under a large load, maintaining the exhaust resistance within a reasonable range. This ensures that the exhaust resistance meets the heat exchange efficiency requirements of the heat exchanger of the gas water heater 1, while reducing the overall fan noise. This avoids modifications to the exhaust port structure and reduces the overall manufacturing cost of the unit.

[0050] In this embodiment, the smoke hood 10 further includes a first rotating sleeve 210, which is fixedly connected to the upper edge of the baffle 200 along the height direction of the housing 100; the rotating shaft 400a passes through the first rotating sleeve 210. The height direction of the housing 100 is as follows... Figure 2 As shown.

[0051] Specifically, a portion of the rotating shaft 400a is located on the upper edge of the baffle 200, and the baffle 200 rotates around the rotating shaft 400a on its upper edge. Correspondingly, another portion of the rotating shaft 400a is located on the housing 100 and above the smoke inlet 101, allowing the baffle 200 to completely close the smoke inlet 101. The rotating shaft 400a is located on the side of the first housing 110 facing the cavity 103, allowing the baffle 200 to open the smoke inlet 101 towards the cavity 103.

[0052] Specifically, the first rotating shaft sleeve 210 is integrally formed with the baffle 200, and the first rotating shaft sleeve 210 is a cylindrical structure formed by bending a portion of the upper edge of the baffle 200. There are two first rotating shaft sleeves 210, which are spaced apart. The two ends of the rotating shaft 400a are respectively located inside the two first rotating shaft sleeves 210, and the rotating shaft 400a rotates with the two first rotating shaft sleeves 210.

[0053] The first limiting member 300 is integrally formed with the baffle 200. The first limiting member 300 is a folded edge structure formed by bending a portion of the upper edge of the baffle 200. The bending direction of the first limiting member 300 is opposite to the bending direction of the first rotating sleeve 210, that is, the first limiting member 300 is bent towards the flue gas flow direction and set on the upper edge of the baffle 200. At least two first limiting members 300 are provided, and they are spaced apart from the first rotating sleeve 210. Furthermore, the first limiting member 300 is set at an angle to the main body of the baffle 200, for example, perpendicularly. The protrusion height of the first limiting member 300 is determined by the preset angle required for the baffle 200 to open, and the value of the preset angle is determined by the power of the blower of the gas water heater 1. After the baffle 200 is blown up and rotated open by the flue gas, when the first limiting member 300 abuts against the housing 100 (second housing 120), the baffle 200 is opened to its maximum, at the preset angle.

[0054] In this embodiment, the smoke hood 10 also includes a second rotating sleeve 113, which is fixed to the housing 100. Along the length of the housing 100, the second rotating sleeve 113 and the first rotating sleeve 210 are arranged side by side. The rotating shaft 400a passes through the first rotating sleeve 210 and the second rotating sleeve 113. When the baffle rotates, the first rotating sleeve 210 and the second rotating sleeve 113 can rotate relative to each other.

[0055] Specifically, the second rotating sleeve 113 is integrally formed with the housing 100, and the second rotating sleeve 113 is a cylindrical structure formed by bending a part of the housing 100. The second rotating sleeve 113 is located between the two first rotating sleeves 210, and the middle part of the rotating shaft 400a passes through the second rotating sleeve 113. When the baffle 200 rotates, the rotating shaft 400a can rotate relative to the second rotating sleeve 113.

[0056] In this embodiment, the housing 100 is provided with a smoke inlet channel 112 surrounding the smoke inlet 101, and the housing 100 is provided with a baffle portion surrounding the smoke inlet 101, the baffle portion being provided with the smoke inlet channel 112. Specifically, the first housing 110 is provided with a smoke inlet channel 112 surrounding the smoke inlet 101, the channel wall of the smoke inlet channel 112 extending from the smoke inlet 101 into the cavity 103 to form a channel, and the baffle 200 can close the smoke inlet channel 112 to close the smoke inlet 101. Further, the width of the baffle 200 is greater than the diameter of the smoke inlet channel 112, so that after the smoke inlet channel 112 is closed, the edge portion of the baffle 200 extends beyond the smoke inlet channel 112 and is limited by the channel wall of the smoke inlet channel 112, so that the baffle 200 is closed in a preset position.

[0057] In this embodiment, the baffle 200 includes a main board and side plates disposed on both sides of the main board. The side plates are bent relative to the main board and are disposed on the outer side of the outer wall of the smoke inlet channel 112, so that when the gas water heater 1 is shut down or in the anti-backdraft protection state (baffle 200 closes the smoke inlet 101), the baffle 200 can better close the smoke inlet 101.

[0058] Example 2

[0059] See Figure 7-10 , Figure 7-10 A schematic diagram of the structure of a fume hood 10 according to one embodiment of this application is shown. The fume hood 10 provided in this embodiment is mainly applicable to outdoor gas water heaters 1. The fume hood 10 includes a housing 100, a baffle 200, and a first limiting member 114. The following only describes the solutions that differ from those in Embodiment 1; the same or similar structures are referred to by the same reference numerals.

[0060] The housing 100 includes a smoke inlet 101, a smoke outlet 102, and a cavity 103 communicating with the smoke inlet 101 and the smoke outlet 102 respectively. The smoke inlet 101 is located on the side wall of the housing 100. A baffle 200 is located in the cavity 103 and is rotatably connected to the housing 100 via a rotating shaft 400b for closing or opening the smoke inlet 101. The smoke inlet 101 extends along the height direction of the housing 100, and the rotating shaft 400b is located at more than half the distance between the upper and lower edges of the smoke inlet 101. A first limiting member 300 is located in the cavity 103 for limiting the baffle 200 from fully opening the smoke inlet 101.

[0061] When the aforementioned exhaust hood 10 is applied to the gas water heater 1, during normal operation of the gas water heater 1, the blower opens the baffle 200, the flue gas inlet 101 opens, and the combustion exhaust gas enters the cavity 103 from the flue gas inlet 101, and finally exits from the exhaust gas outlet 102. In severe weather such as hurricanes, when the external wind pressure exceeds the maximum blower pressure, the baffle 200 closes the flue gas inlet 101, and the entire unit activates its wind pressure protection function to prevent foreign objects from entering the gas water heater 1 and affecting its service life. In the standby state of the gas water heater 1, the baffle 200 is connected to the housing 100 via a rotating shaft 400b. The rotating shaft 400b is located at more than half the distance between the upper and lower edges of the flue gas inlet 101. Thus, with the rotating shaft 400b as the fulcrum separating the upper and lower parts of the baffle 200, the center of gravity of the baffle 200 is lowered. Under the action of its own weight, the baffle 200 rotates, making it easier to close the flue gas inlet 101, preventing foreign objects from entering the unit and accumulating and clogging, which would affect the overall performance of the unit. Normal operation; unlike the prior art where the lower side of the baffle is rotatably connected to the smoke hood housing via a torsion spring and a rotating shaft, and the torsion spring applies an elastic force to the baffle to close the smoke inlet, the smoke hood 10, by setting the position of the rotating shaft 400b, allows the baffle 200 to close the smoke inlet 101 by its own weight. The assembly between the baffle 200 and the housing 100 of the smoke hood 10 becomes simpler, thereby improving the assembly efficiency of the smoke hood 10; furthermore, since this utility model lacks a torsion spring... When the gas water heater 1 is operating under a large load, the baffle 200 will fully open the flue gas inlet 101 (i.e., the projection of the baffle 200 on the plane where the flue gas inlet 101 is located does not overlap with the flue gas inlet 101). The decrease in exhaust resistance causes the flue gas to escape too quickly, resulting in a decrease in the heat exchange efficiency of the heat exchanger of the gas water heater 1. Therefore, by setting the first limiting member 300, the baffle 200 is prevented from fully opening the flue gas inlet 101, ensuring that the exhaust resistance meets the heat exchange efficiency requirements of the heat exchanger of the gas water heater 1.

[0062] In this embodiment, the baffle 200 includes a main board 201 and side plates 202 disposed on both sides of the main board 201 along its length; the number of rotating shafts 400b corresponds one-to-one with the number of side plates 202; the rotating shafts 400b are fixedly connected to the side plates 202 of the baffle 200.

[0063] Specifically, the side plate 302 is bent relative to the main board 301, for example, the side plate 302 and the main board 301 are perpendicular to each other, and the side plate 302 has a through hole for the rotating shaft 400b to pass through the side plate 302. The rotating shaft 400b passes through the housing 100 and the side plate 302 to realize the rotational connection between the baffle 200 and the housing 100. The first limiting member 300 protrudes from the housing 100, and the end of the first limiting member 300 extends into the cavity 103 to abut against the baffle 200 rotated to a preset angle.

[0064] At this time, the position of the rotating shaft 400b is closer to half the distance between the upper and lower edges of the flue gas inlet 101. This design moves the rotating shaft 400b from the top to the upper part of the baffle 200, making it easier for the fan to blow up the baffle 200. This is suitable for gas water heaters 1 with smaller fan power. Also, because the bottom of the baffle 200 is heavy, the baffle 200 can automatically close in standby mode under the action of gravity.

[0065] In this embodiment, the housing 100 is provided with a baffle portion surrounding the smoke inlet 101. The baffle portion is provided with a smoke inlet channel 112. The inner wall of the smoke inlet channel 112 is provided with a connecting hole, and the rotating shaft 400b is rotatably inserted into the connecting hole. The first limiting member 300 protrudes from the edge of the smoke inlet channel 112 and extends toward the center of the smoke inlet 101. The rotating shaft 400b is provided in the smoke inlet channel 112.

[0066] Specifically, the first housing 110 is provided with a smoke inlet channel 112 surrounding the smoke inlet 101. The channel wall of the smoke inlet channel 112 extends from the smoke inlet 101 into the cavity 103 to form a channel. The baffle 200 can close the smoke inlet channel 112 to close the smoke inlet 101. Furthermore, the width of the baffle 200 is smaller than the diameter of the smoke inlet channel 112. The baffle 200 is disposed within the smoke inlet channel 112 and rotates within the smoke inlet channel 112. The rotating shaft 400b passes through the channel wall and the side plate 202 of the smoke inlet channel 112 to realize the rotational connection between the baffle 200 and the housing 100.

[0067] The first limiting member 300 is integrally formed with the channel wall of the flue gas passage. The first limiting member 300 is a folded edge structure formed by bending a portion of the upper edge of the channel wall. The bending direction of the first limiting member 300 is towards the middle of the flue gas inlet 101. At least two first limiting members 300 are provided and are spaced apart. The protruding length of the first limiting member 300 is determined by the preset angle required for the baffle 200 to open, and the value of the preset angle is determined by the power of the blower of the gas water heater 1. After the baffle 200 is blown up and rotated open by the flue gas, when the first limiting member 300 abuts against the baffle 200, the baffle 200 is opened to its maximum, at the preset angle.

[0068] In this embodiment, when the baffle 200 closes the smoke inlet 101, the first limiting member 300 is located on the side of the baffle 200 facing the cavity 103. The baffle 200 is disposed in the smoke inlet channel 112, and the first limiting member 300 is located on the edge of the smoke inlet channel 112 facing the cavity 103. When the baffle 200 is opened, it rotates toward the cavity 103 to approach and abut against the first limiting member 300.

[0069] In this embodiment, the smoke hood 10 also includes a second limiting member 114. The second limiting member 114 is disposed on the housing 100. When the baffle 200 tends to move toward closing the smoke inlet 101, the second limiting member 114 is used to abut against the side of the baffle 200 away from the smoke inlet 101.

[0070] Specifically, the second limiting member 114 protrudes from the inner wall of the smoke passage, for example, perpendicularly to the inner wall of the passage. In a direction parallel to the passage wall of the smoke passage, when the baffle 200 closes the smoke inlet 101, the side of the baffle 200 facing away from the cavity 103 abuts against the second limiting member 114, and the baffle 200 is located between the second limiting member 114 and the first limiting member 300. The two limiting structures ensure the opening degree of the anti-backdraft baffle 200, while also ensuring that strong external winds cannot blow the anti-backdraft baffle 200 open when it is closed.

[0071] There are multiple second limiting members 114, which are evenly distributed along the length of the housing 100 within the smoke inlet channel 112. At least one second limiting member 114 is provided; for example, there can be three second limiting members 114.

[0072] In this embodiment, the second limiting member 114 protrudes from the edge of the smoke inlet channel 112 opposite to the first limiting member 300, and the second limiting member 114 extends toward the middle of the smoke inlet 101. Specifically, in the length direction of the smoke outlet 102, the second limiting member 114 and the first limiting member 300 are at the same position.

[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A fume hood for a gas water heater, characterized in that, include: The housing (100) includes a smoke inlet (101), a smoke outlet (102), and a cavity (103) communicating with the smoke inlet (101) and the smoke outlet (102) respectively. The smoke inlet (101) is located on the side wall of the housing (100). A baffle (200) is disposed inside the cavity (103) and rotatably connected to the housing (100) via a rotating shaft, for closing or opening the smoke inlet (101); the smoke inlet (101) extends along the height direction of the housing (100), and the rotating shaft is located at more than half the distance between the upper and lower edges of the smoke inlet (101); A first limiting member (300) is disposed in the cavity (103) to restrict the baffle (200) from fully opening the smoke inlet (101).

2. The smoke hood according to claim 1, characterized in that, The first limiting member (300) is fixed to the housing (100), and the side of the baffle (200) facing away from the smoke inlet (101) is used to abut against the first limiting member (300); and / or, the first limiting member (300) is fixed to the side of the baffle (200) facing away from the smoke inlet (101), and the first limiting member (300) is used to abut against the housing (100).

3. The smoke hood according to claim 1, characterized in that, It also includes a first rotating sleeve (210), which is fixed to the upper edge of the baffle (200) along the height direction of the housing (100); the rotating shaft passes through the first rotating sleeve (210).

4. The smoke hood according to claim 3, characterized in that, It also includes a second rotating sleeve (113), which is fixed to the housing (100); along the length direction of the housing (100), the second rotating sleeve (113) and the first rotating sleeve (210) are arranged side by side, and the rotating shaft passes through the first rotating sleeve (210) and the second rotating sleeve (113). When the baffle rotates, the first rotating sleeve (210) and the second rotating sleeve (113) can rotate relative to each other.

5. The smoke hood according to claim 1, characterized in that, The baffle (200) includes a main board (201) and two side boards (202), with the two side boards (202) respectively located on both sides of the main board (201) along its length. The number of the rotating shafts corresponds one-to-one with the number of the side boards (202). The two rotating shafts are fixedly connected to the side boards (202) of the baffle (200).

6. The smoke hood according to claim 5, characterized in that, The housing (100) is provided with a baffle portion surrounding the smoke inlet (101). The baffle portion is located inside the cavity (103). The baffle portion is provided with a smoke inlet channel (112). The inner wall of the smoke inlet channel (112) is provided with a connecting hole. The rotating shaft is rotatably inserted into the connecting hole.

7. The smoke hood according to claim 6, characterized in that, The smoke hood (10) further includes a second limiting member (114), which is fixed to the housing (100). When the baffle (200) moves toward closing the smoke inlet (101), the second limiting member (114) is used to abut against the side of the baffle (200) facing the smoke inlet (101).

8. The smoke hood according to claim 7, characterized in that, The number of the second limiting member (114) is at least two, and at least two of the second limiting members (114) are evenly spaced along the length direction of the housing (100) in the smoke inlet channel (112).

9. The smoke hood according to any one of claims 1-8, characterized in that, The housing (100) includes a first housing (110) and a second housing (120). The first housing (110) forms the smoke inlet (101), and the baffle is connected to the first housing (110). The second housing forms the smoke outlet (102). The first housing (110) and the second housing (120) enclose the cavity (103).

10. A gas-fired water heater, characterized in that, Includes the smoke hood (10) as described in any one of claims 1-9.

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