Downdraft prevention structure of gas water heater

Abstract

The utility model relates to the technical field of hot water supply equipment, and discloses an anti-downdraft structure of a gas water heater. The down draft prevention structure of the gas water heater comprises a containing cylinder, an annular base, a sealing ring and a down draft prevention mechanism, a vertically-through channel is formed in the containing cylinder, the annular base is arranged in the channel, the sealing ring is arranged on the annular base, and the lower side of the inner wall of the sealing ring is provided with a first inclined face inclining towards the axis of the sealing ring in the smoke circulation direction; the down draft preventing mechanism is arranged on the annular base, the annular base and the sealing ring are each provided with an air passing opening, and the down draft preventing mechanism is used for opening or covering the air passing opening. The first inclined plane is arranged below the inner wall of the sealing ring, so that the inner wall of the sealing ring can guide airflow to flow more smoothly, smoke gathers towards the middle of the sealing ring in the flowing process, and resistance borne by the smoke in the flowing process is reduced.

Description

Technical Field

[0001] This utility model relates to the field of hot water supply equipment technology, and in particular to an anti-backdraft structure for a gas water heater. Background Technology

[0002] A gas water heater is a device that uses gas as an energy source to heat water. Gas water heaters are widely used in homes, businesses, and industries for supplying hot water.

[0003] In existing technology, because the exhaust pipe of a gas water heater needs to extend outdoors, an anti-backdraft structure is usually installed inside the exhaust pipe to prevent cold outdoor air from flowing back into the gas water heater. To ensure the sealing performance of the anti-backdraft structure, a sealing ring is usually installed at the fitting point of the anti-backdraft cover. However, installing an anti-backdraft structure in the exhaust pipe increases the flow resistance in the exhaust system, which in turn leads to excessive carbon monoxide content in the emitted flue gas. Utility Model Content

[0004] The technical problem solved by this utility model is to provide an anti-backdraft structure for a gas water heater, which effectively solves the problem of increased flow resistance in the exhaust system caused by the anti-backdraft structure. By providing a first inclined surface below the inner wall of the sealing ring, the inner wall of the sealing ring can guide the airflow to flow more smoothly. During the flow, the flue gas gathers towards the center of the sealing ring, reducing the resistance encountered by the flue gas during the flow.

[0005] The above-mentioned technical problems are solved by the following technical solutions:

[0006] A backdraft prevention structure for a gas water heater includes:

[0007] The container has a through-hole running vertically inside;

[0008] An annular base is disposed within the channel;

[0009] A sealing ring is disposed on the annular base, and the lower side of the inner wall of the sealing ring has a first inclined surface that is inclined toward the axis of the sealing ring along the flue gas flow direction.

[0010] An anti-backdraft mechanism is provided on the annular base. Both the annular base and the sealing ring have air vents. The anti-backdraft mechanism is used to open or cover the air vents.

[0011] Compared with the prior art, the anti-backdraft structure of the gas water heater described in this utility model has the following advantages: By installing the anti-backdraft structure inside the gas water heater and connecting the containment cylinder to the exhaust pipe of the gas water heater, the flue gas inside the gas water heater can be discharged through the anti-backdraft mechanism. When the gas water heater is running, the fan starts, and the airflow blows open the anti-backdraft cover of the mechanism, opening the vent and allowing the containment cylinder to be opened, thus facilitating the discharge of flue gas. When the gas water heater is not running, the anti-backdraft cover seals the vent, closing the containment cylinder and preventing outdoor air from flowing back into the room through the containment cylinder.

[0012] Furthermore, because the containment cylinder has a sealing ring and an annular base, and the sealing ring is installed on the annular base, the inner wall of the sealing ring has a first inclined surface that slopes towards the axis along the direction of flue gas flow. This allows the inner wall of the sealing ring to guide the airflow more smoothly, causing the flue gas to converge towards the center of the sealing ring during flow, reducing the resistance encountered by the flue gas during flow, and reducing the residence time of the flue gas in the containment cylinder, thereby reducing the formation of carbon monoxide. At the same time, the first inclined surface can also play a guiding role to a certain extent, allowing the flue gas to be discharged more quickly and improving the smoke extraction efficiency.

[0013] In one embodiment, either the annular base or the sealing ring is provided with a buckle, and the other is provided with a groove that engages with the buckle.

[0014] In one embodiment, the annular base is provided with a support plate, and the outer side wall of the sealing ring is provided with a first mounting groove in the transverse direction, and the support plate is embedded in the first mounting groove.

[0015] In one embodiment, the free end of the support plate extends to form a snap-fit ​​flange, the snap-fit ​​flange forming a non-flat angle with the support plate, the inner wall of the first mounting groove extends to form a first groove, the snap-fit ​​flange is embedded in the first groove, the support plate and the snap-fit ​​flange form the buckle, and the first mounting groove and the first groove communicate to form the snap groove.

[0016] In one embodiment, the annular base includes an annular surrounding plate, which is disposed above the support plate and surrounds the outer edge of the support plate. The inner wall of the annular surrounding plate is provided with at least one positioning part protruding toward the axis of the annular surrounding plate, and the outer wall of the sealing ring is provided with positioning grooves corresponding to the positioning parts.

[0017] In one embodiment, the anti-backdraft mechanism includes a rotating shaft and an anti-backdraft cover, the anti-backdraft cover being rotatably mounted on the positioning part via the rotating shaft, and the anti-backdraft cover being used to open or close the air vent.

[0018] In one embodiment, the upper surface of the sealing ring is provided with an inclined flange arranged around the edge of the air passage. The inclined flange is inclined along the flue gas flow direction toward an axis away from the air passage, and the anti-backdraft cover abuts against the inclined flange in the sealed state.

[0019] In one embodiment, the annular base is provided with a crossbeam, which divides the air vent into two air vents. Two anti-backdraft covers are provided, which are used to open or close the two air vents respectively.

[0020] The positioning part is provided in two parts, which are located at both ends of the crossbeam. Each positioning part has a limiting part at its end. The limiting part is set at an angle to the positioning part and is inclined toward the axis of the annular enclosure. The limiting part is used to limit the maximum opening angle of the two anti-backdraft covers.

[0021] In one embodiment, the middle area of ​​the sealing ring is provided with a connecting part corresponding to the crossbeam, and the crossbeam is provided with a second flange on both sides. The second flange is set at a non-flat angle with the crossbeam. The bottom wall of the connecting part is provided with a second mounting groove, and the side wall of the second mounting groove is provided with a second recess. The crossbeam is disposed in the second mounting groove and the second flange is embedded in the second recess.

[0022] In one embodiment, the connecting portion divides the air passage of the sealing ring into two air passages, and a second inclined surface is provided on both sides below the outer wall of the connecting portion, the second inclined surface being inclined toward the axis of the corresponding air passage. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is an explosion diagram illustrating an anti-backdraft structure for a gas water heater according to an embodiment of the present invention.

[0025] Figure 2This is a schematic diagram of the annular base and sealing ring in an anti-backdraft structure of a gas water heater according to an embodiment of the present invention;

[0026] Figure 3 This is a side view of an anti-backdraft structure for a gas water heater according to an embodiment of the present utility model;

[0027] Figure 4 This is a cross-sectional view of the anti-backdraft structure of a gas water heater according to an embodiment of the present utility model in the sealed state;

[0028] Figure 5 for Figure 4 A magnified view of part A in the middle;

[0029] Figure 6 for Figure 4 A magnified view of part B in the middle section;

[0030] Figure 7 This is a cross-sectional view of the anti-backdraft structure of a gas water heater according to an embodiment of the present utility model, in the closed state, from another perspective.

[0031] Figure 8 This is a cross-sectional view of the anti-backdraft structure of a gas water heater according to an embodiment of the present utility model in the open state;

[0032] Figure 9 This is a cross-sectional view of the anti-backdraft structure of a gas water heater according to an embodiment of the present invention, in the open state, from another perspective.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Container cylinder; 101. First exhaust pipe; 102. Second exhaust pipe; 2. Annular base; 201. Buckle; 2011. Support plate; 2012. Snap-fit ​​flange; 202. Annular surrounding plate; 2021. Positioning part; 2022. Limiting part; 203. Crossbeam; 2031. Second flange; 3. Sealing ring; 301. First inclined surface; 302. Air outlet; 303. Slot; 3031. First mounting slot; 3032. First groove; 305. Positioning slot; 306. Inclined flange; 307. Connecting part; 3071. Second mounting slot; 3072. Second groove; 3073. Second inclined surface; 4. Anti-backdraft mechanism; 401. Rotating shaft; 402. Anti-backdraft cover; 5. Chimney rubber ring. Detailed Implementation

[0035] 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 of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0036] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "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.

[0037] 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. Therefore, a feature defined as "first" or "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.

[0038] 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.

[0039] In related technologies, since the exhaust pipe of a gas water heater needs to extend outdoors, an anti-backdraft structure is usually installed inside the exhaust pipe to prevent cold outdoor air from flowing back into the gas water heater. To ensure the sealing performance of the anti-backdraft structure, a sealing ring is usually installed at the fitting point of the anti-backdraft cover. However, installing an anti-backdraft structure in the exhaust pipe increases the flow resistance in the exhaust system, which in turn causes the carbon monoxide content in the emitted flue gas to exceed the standard.

[0040] To solve the above technical problems, the following will be combined with... Figures 1 to 9 The embodiments of the present invention are described as shown.

[0041] According to embodiments of the present invention, on the one hand, such as Figures 1 to 9As shown, a backdraft prevention structure for a gas water heater is provided, including a housing cylinder 1, an annular base 2, a sealing ring 3, and a backdraft prevention mechanism 4.

[0042] Specifically, such as Figure 1 and Figure 4 As shown, the interior of the accommodating cylinder 1 has a through channel running vertically through it.

[0043] Specifically, such as Figures 1 to 5 As shown, the annular base 2 is installed inside the channel of the accommodating cylinder 1.

[0044] Specifically, such as Figures 1 to 5 As shown, the sealing ring 3 is mounted on the annular base 2. The inner wall of the sealing ring 3 has a first inclined surface 301 on its lower side, which is inclined towards the axis of the sealing ring 3 along the flue gas flow direction.

[0045] Specifically, such as Figures 1 to 4 As shown, the anti-backdraft mechanism 4 is installed on the annular base 2. Both the annular base 2 and the sealing ring 3 have air vents 302. The anti-backdraft mechanism 4 is used to open or close the air vents 302.

[0046] This gas water heater features an anti-backdraft structure. The anti-backdraft mechanism is installed inside the water heater, connecting the containment cylinder 1 to the exhaust pipe, allowing the flue gas inside the water heater to be discharged through the anti-backdraft mechanism 4. When the water heater is running, the fan starts, blowing open the anti-backdraft cover 402 of the anti-backdraft mechanism 4, opening the vent 302 and allowing the containment cylinder 1 to be open for smooth exhaust. When the water heater is not running, the anti-backdraft cover 402 closes the vent 302, closing the containment cylinder 1 and preventing outdoor air from flowing back into the room through the containment cylinder 1.

[0047] Furthermore, since the channel of the receiving cylinder 1 is equipped with a sealing ring 3 and an annular base 2, and the sealing ring 3 is installed on the annular base 2, the lower part of the inner wall of the sealing ring 3 has a first inclined surface 301. The first inclined surface 301 is inclined towards the axis along the flue gas flow direction, which allows the inner wall of the sealing ring 3 to guide the airflow more smoothly. During the flow, the flue gas gathers towards the center of the sealing ring 3, reducing the resistance encountered by the flue gas during the flow and reducing the residence time of the flue gas in the receiving cylinder 1, thereby reducing the generation of carbon monoxide. At the same time, the first inclined surface 301 can also play a guiding role to a certain extent, allowing the flue gas to be discharged more quickly and improving the smoke exhaust efficiency.

[0048] Specifically, such as Figures 1 to 4 As shown, the accommodating cylinder 1 includes a first exhaust pipe 101 and a second exhaust pipe 102, which are connected and communicate with each other by means of a sleeve connection.

[0049] It should be noted that the flue gas flow direction refers to the flow from the bottom of the container 1 to the top of the container 1. This can also be understood as, for example... Figure 3 and Figure 4 As shown, the flue gas flow direction refers to the flow from the first exhaust pipe 101 towards the second exhaust pipe 102.

[0050] Specifically, the anti-backdraft mechanism 4 can be any existing anti-backdraft device. For example, the anti-backdraft mechanism 4 can be provided with one anti-backdraft cover 402 or two anti-backdraft covers 402. In this embodiment, the structure of the anti-backdraft mechanism 4 is not specifically limited.

[0051] Specifically, the annular base 2, the sealing ring 3, and the anti-backdraft mechanism 4 can be set at any position in the channel. In this embodiment, there are no specific restrictions on the setting positions of the annular base 2, the sealing ring 3, and the anti-backdraft mechanism 4.

[0052] Specifically, the tilt angle of the first tilt surface 301 can be adaptively set according to the type of gas water heater or the size of the sealing ring 3. In this embodiment, the tilt angle of the first tilt surface 301 is not specifically limited.

[0053] In one embodiment, such as Figure 4 and Figure 5 As shown, either the annular base 2 or the sealing ring 3 is provided with a buckle 201, and the other is provided with a slot 303, which is adapted to the buckle 201.

[0054] The sealing ring 3 and the annular base 2 are connected by snap-fit ​​201 and snap-fit ​​303, ensuring that the sealing ring 3 will not easily fall off during long-term use, thus guaranteeing the sealing performance of the anti-backdraft structure and effectively preventing cold air from seeping in from the connection between the sealing ring 3 and the annular base 2.

[0055] Specifically, the buckle 201 and the slot 303 can be adapted to the structure of the sealing ring 3 and the annular base 2. For example, the buckle 201 can be set as a hook-shaped buckle and the slot 303 can be set as a recessed slot, or the buckle 201 can be set as a mushroom-shaped buckle and the slot 303 can be set as a circular slot. In this embodiment, the structure of the buckle 201 and the slot 303 is not specifically limited.

[0056] In one embodiment, such as Figure 4 and Figure 5 As shown, a support plate 2011 is provided on the annular base 2, and a first mounting groove 3031 is provided laterally on the outer side wall of the sealing ring 3. The support plate 2011 is embedded in the first mounting groove 3031.

[0057] Since the outer wall of the sealing ring 3 is provided with a first mounting groove 3031 corresponding to the support plate 2011, when assembling the sealing ring 3 and the annular base 2, the support plate 2011 on the annular base 2 is embedded in the first mounting groove 3031 of the sealing ring 3, so that the sealing ring 3 is firmly connected to the annular base 2, ensuring that the sealing ring 3 will not easily fall off during long-term use.

[0058] In one embodiment, such as Figure 4 and Figure 5 As shown, the free end of the support plate 2011 extends to form a snap-fit ​​flange 2012, and the included angle between the snap-fit ​​flange 2012 and the support plate 2011 is not a flat angle. The inner wall of the first mounting groove 3031 is provided with a first recess 3032, and the snap-fit ​​flange 2012 is embedded in the first recess 3032. The support plate 2011 and the snap-fit ​​flange 2012 form a buckle 201, and the first mounting groove 3031 and the first recess 3032 communicate to form a slot 303.

[0059] During the assembly of the sealing ring 3 and the annular base 2, the installer only needs to install the support plate 2011 of the annular base 2 into the first mounting groove 3031 of the sealing ring 3 and snap the snap-fit ​​flange 2012 into the first groove 3032 of the sealing ring 3. The operation is simple and quick, which improves the installation efficiency.

[0060] The support plate 2011 and the snap-fit ​​flange 2012 form a snap fastener 201. The first mounting groove 3031 and the first recess 3032 are connected to form a slot 303. Due to the snap fastener 201 and the slot 303, a tight connection structure is formed between the annular base 2 and the sealing ring 3, which can effectively fix the sealing ring 3 on the annular base 2, ensuring the stability of the sealing ring 3 in the sealing position, thereby ensuring the sealing effect of the anti-backdraft structure and reducing the possibility of cold air backflow.

[0061] Specifically, both the first mounting groove 3031 and the first recess 3032 can be configured as elongated grooves, and the first mounting groove 3031 and the first recess 3032 are set at an angle. For example, the first mounting groove 3031 and the first recess 3032 are set perpendicular to each other, which can prevent the buckle 201 from disengaging from the slot 303. In the embodiments of this application, no specific limitations are placed on the structure and arrangement of the first mounting groove 3031 and the first recess 3032.

[0062] In one embodiment, such as Figure 2 , Figure 4 and Figure 5As shown, the annular base 2 includes an annular surrounding plate 202, which is disposed above the support plate 2011 and surrounds the outer edge of the support plate 2011. At least one positioning part 2021 is provided on the inner wall of the annular surrounding plate 202, protruding towards the axis of the annular surrounding plate 202. A positioning groove 305 is provided on the outer wall of the sealing ring 3, and the positioning groove 305 corresponds one-to-one with the positioning part 2021.

[0063] The sealing ring 3 is partially placed inside the annular surrounding plate 202. The annular surrounding plate 202 provides a stable receiving space for the sealing ring 3, so that the sealing ring 3 can maintain the stability of its shape and position during operation. This effectively prevents the sealing ring 3 from deforming or displacing when subjected to external pressure, thereby ensuring the sealing effect between the sealing ring 3 and other components and better preventing cold air backflow.

[0064] In addition, the combination of the annular enclosure 202 and the support plate 2011 increases the overall structural strength of the annular base 2, thereby improving the reliability and stability of the entire anti-backdraft structure.

[0065] During the assembly of the sealing ring 3, the positioning groove 305 on the sealing ring 3 corresponding to the positioning part 2021 provides clear installation guidance for the installer. The installer only needs to align the positioning groove 305 on the sealing ring 3 with the positioning part 2021 on the annular surrounding plate 202 for installation. This operation is simple, quick, and accurate, improving installation efficiency. Simultaneously, the cooperation between the positioning part 2021 and the positioning groove 305 precisely limits the position of the sealing ring 3 within the annular surrounding plate 202, preventing the sealing ring 3 from rotating within the annular surrounding plate 202.

[0066] Specifically, the height of the annular surrounding plate 202 can be set to match the thickness of the sealing ring 3, or the height of the annular surrounding plate 202 can be greater than the thickness of the sealing ring 3. In this embodiment, the size of the annular surrounding plate 202 is not specifically limited.

[0067] Specifically, the positioning part 2021 can be configured in any existing shape, such as a square protrusion or a long strip protrusion. In this embodiment, the structure of the positioning part 2021 is not specifically limited.

[0068] Specifically, one positioning part 2021 may be provided, or multiple positioning parts may be provided at intervals around the annular surrounding plate 202. In this embodiment of the application, the number of positioning parts 2021 is not specifically limited.

[0069] In one embodiment, such as Figure 1 and Figure 2As shown, the anti-backdraft mechanism 4 includes a rotating shaft 401 and an anti-backdraft cover 402. The anti-backdraft cover 402 is rotatably mounted on the positioning part 2021 via the rotating shaft 401. The anti-backdraft cover 402 is used to open or close the air vent 302.

[0070] The rotating shaft 401 is installed on the positioning part 2021. The positioning part 2021 can not only position the positioning groove 305, but also act as a shaft seat, which simplifies the structure of the annular base 2 and reduces the production cost of the annular base 2.

[0071] The anti-backdraft cover 402 is rotatably mounted on the rotating shaft 401, providing sealing and anti-backdraft protection, forming a tighter seal, and more effectively preventing the intrusion of cold air or other pollutants. When the anti-backdraft mechanism 4 is in the covered state, the anti-backdraft cover 402 covers the air outlet 302, ensuring that the anti-backdraft cover 402 can provide a tighter seal.

[0072] For example, two positioning parts 2021 can be provided, with the two positioning parts 2021 located on the same diameter of the annular surrounding plate 202, and the two ends of the rotating shaft 401 are respectively installed on the two positioning parts 2021.

[0073] In one embodiment, such as Figure 4 and Figure 5 As shown, the upper surface of the sealing ring 3 is provided with an inclined flange 306, which is arranged around the edge of the air passage 302. The inclined flange 306 is inclined along the flue gas flow direction toward the axis away from the air passage 302, and the anti-backdraft cover 402 abuts against the inclined flange 306 in the closed state.

[0074] When the anti-backdraft cover 402 is in the sealed state, it abuts against the inclined flange 306. On the one hand, the anti-backdraft cover 402 itself can block the entry of external air; on the other hand, the close contact between the inclined flange 306 and the anti-backdraft cover 402 further enhances the sealing effect, effectively preventing cold air backflow and flue gas leakage. At the same time, since the inclined flange 306 is inclined along the axis away from the air outlet 302 in the flue gas flow direction, the inclined flange 306 can automatically adjust the degree of contact with the anti-backdraft cover 402 under different pressures, always maintaining a good sealing state, ensuring that abnormal air and flue gas flow can be effectively prevented under various operating conditions. Furthermore, the inclination in the above direction can also reduce the exhaust resistance and improve the smoothness of exhaust.

[0075] Specifically, the tilt angle of the tilted flange 306 can be adaptively set according to the size of the sealing ring 3. In this embodiment, the size of the tilted flange 306 is not specifically limited.

[0076] In one embodiment, such as Figure 2 and Figure 6As shown, the annular base 2 is provided with a crossbeam 203, which divides the air vent 302 into two air vents 302. Two anti-backdraft covers 402 are provided, which are used to open or close the two air vents 302 respectively.

[0077] There are two positioning parts 2021, which are located at both ends of the crossbeam 203. Each positioning part 2021 has a limiting part 2022 at its end. The limiting part 2022 is set at an angle to the positioning part 2021 and is inclined toward the axis of the annular enclosure 202. The limiting part 2022 is used to limit the maximum opening angle of the two anti-backdraft covers 402.

[0078] By setting a crossbeam 203 on the support plate 2011, the air outlet 302 is divided into two air outlets 302 by the crossbeam 203. The two anti-backdraft covers 402 are rotatably set on both sides of the rotating shaft 401, which can provide bidirectional sealing and anti-backdraft protection, forming a tighter sealing effect and more effectively preventing the intrusion of cold air or other pollutants.

[0079] Because the end of the positioning part 2021 is provided with a limiting part 2022, and the limiting part 2022 is inclined towards the axis of the annular surrounding plate 202, when the anti-backdraft cover 402 is opened to a certain angle, the surface of the anti-backdraft cover 402 can contact the limiting part 2022, so that the limiting part 2022 restricts the maximum opening angle of the anti-backdraft cover 402. When the gas water heater is running, the fan starts and blows open the anti-backdraft cover 402. The limiting part 2022 can ensure that the anti-backdraft cover 402 will not be over-opened due to excessive wind force, so that the opening angle of the anti-backdraft cover 402 is kept within a reasonable range. This ensures that the flue gas can be smoothly discharged through the air outlet 302, and also avoids the problem of the anti-backdraft cover 402 failing to close due to over-opening.

[0080] Specifically, the limiting part 2022 can be configured in any structure such as sheet or block. By adjusting the size of the limiting part 2022, the maximum opening angle of the anti-backdraft cover 402 can be limited. In this embodiment, the structure of the limiting part 2022 is not specifically limited.

[0081] like Figure 2 As shown, in one embodiment, the crossbeam is specifically disposed within the support plate 2011 and integrally formed with the support plate 2011, and spans the center of the annular base 2, so that the two air vents 302 are axially symmetrically distributed, which can reduce the manufacturing cost of the annular base. Of course, in other embodiments, the crossbeam can also be disposed within the annular surrounding plate 202 and connected to the annular surrounding plate. In addition, the crossbeam may not pass through the center of the annular base 2 according to actual needs. The specific arrangement of the crossbeam can be changed according to specific needs, and is not limited here.

[0082] In one embodiment, such as Figure 2 and Figure 6 As shown, the sealing ring 3 has a connecting part 307 in the middle area, which is correspondingly arranged with the crossbeam 203. The crossbeam 203 has second flanges 2031 on both opposite sides, forming a non-flat angle with the crossbeam 203. The bottom wall of the connecting part 307 has a second mounting groove 3071, and the side wall of the second mounting groove 3071 has a second recess 3072. The crossbeam 203 and the connecting part 307 are installed in the second mounting groove 3071 via the crossbeam 203, and the second flanges 2031 and the second recesses 3072 are engaged to achieve connection.

[0083] During the assembly of the sealing ring 3 and the annular base 2, the installer needs to insert the crossbeam 203 of the annular base 2 into the second mounting groove 3071 of the sealing ring 3, and align the second flange 2031 of the crossbeam 203 with the second groove 3072 of the sealing ring 3 to snap it in place. This creates a tight connection between the crossbeam 203 of the annular base 2 and the connecting part 307 of the sealing ring 3, which effectively fixes the sealing ring 3 on the crossbeam 203 and ensures the stability of the sealing ring 3 in the sealing position.

[0084] In one embodiment, such as Figure 2 and Figure 6 As shown, the connecting part 307 divides the air passage 302 of the sealing ring 3 into two air passages 302. The lower part of the outer wall on both sides of the connecting part 307 is provided with a second inclined surface 3073, which is inclined toward the axis of the air passage 302.

[0085] Because a second inclined surface 3073 is provided on the lower part of the outer wall of the connecting part 307, and the second inclined surface 3073 is inclined towards the axis of the air passage 302 along the flue gas flow direction, the second inclined surface 3073 can guide the airflow to pass through the air passage 302 more smoothly. At the same time, under the combined guiding effect of the second inclined surface 3073 and the first inclined surface 301, the flue gas gathers towards the middle of the air passage 302 during the flow process, reducing the resistance encountered by the flue gas during the flow process, reducing the residence time of the flue gas in the container 1, thereby reducing the generation of carbon monoxide.

[0086] Specifically, such as Figures 8 to 9 As shown, it also includes a chimney rubber ring 5, which can be embedded in the inner wall of the first chimney pipe 101.

[0087] The assembly process of the anti-backdraft structure of the gas water heater in this embodiment is described as follows:

[0088] First, connect the connecting part 307 of the sealing ring 3 to the crossbeam 203 of the annular base 2, install the crossbeam 203 in the second mounting groove 3071, and connect it by engaging the second flange 2031 with the second groove 3072. Then, install the support plate 2011 in the first mounting groove 3031, and connect it by engaging the buckle 201 with the slot 303, ensuring a secure connection between the sealing ring 3 and the annular base 2.

[0089] Next, the two anti-backdraft covers 402 are rotated and mounted on the positioning part 2021 via the rotating shaft 401, so that the anti-backdraft mechanism 4 is mounted on the annular base 2.

[0090] Finally, connect the annular surrounding plate 202 of the annular base 2 to the inner wall of the accommodating cylinder 1. To ensure that the annular base 2 is firmly fixed inside the accommodating cylinder 1, the connection between the annular surrounding plate 202 and the inner wall of the accommodating cylinder 1 can be welded to complete the assembly of the anti-backdraft structure.

[0091] 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.

[0092] 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. A backdraft prevention structure for a gas water heater, characterized in that, include: The container (1) has a through channel running vertically through it; An annular base (2) is disposed within the channel; A sealing ring (3) is provided on the annular base (2), and the lower side of the inner wall of the sealing ring (3) has a first inclined surface (301) that is inclined toward the axis of the sealing ring (3) along the flue gas flow direction. An anti-backdraft mechanism (4) is provided on the annular base (2). Both the annular base (2) and the sealing ring (3) have air vents (302). The anti-backdraft mechanism (4) is used to open or cover the air vents (302).

2. The anti-backdraft structure of the gas water heater according to claim 1, characterized in that: The annular base (2) or the sealing ring (3) is provided with a buckle (201) on one side and a groove (303) that cooperates with the buckle (201) on the other side.

3. The anti-backdraft structure of the gas water heater according to claim 2, characterized in that: The annular base (2) is provided with a support plate (2011), and the outer side wall of the sealing ring (3) is provided with a first mounting groove (3031) in the horizontal direction. The support plate (2011) is embedded in the first mounting groove (3031).

4. The anti-backdraft structure of the gas water heater according to claim 3, characterized in that: The free end of the support plate (2011) extends to form a snap-fit ​​flange (2012), and the snap-fit ​​flange (2012) forms a non-flat angle with the support plate (2011). The inner wall of the first mounting groove (3031) extends to form a first groove (3032), and the snap-fit ​​flange (2012) is embedded in the first groove (3032). The support plate (2011) and the snap-fit ​​flange (2012) form the buckle (201), and the first mounting groove (3031) and the first groove (3032) communicate to form the snap groove (303).

5. The anti-backdraft structure of the gas water heater according to claim 3, characterized in that: The annular base (2) includes an annular surrounding plate (202), which is located above the support plate (2011) and surrounds the outer edge of the support plate (2011). The inner wall of the annular surrounding plate (202) is provided with at least one positioning part (2021) protruding towards the axis of the annular surrounding plate (202). The outer wall of the sealing ring (3) is provided with positioning grooves (305) that correspond one-to-one with the positioning parts (2021).

6. The anti-backdraft structure of the gas water heater according to claim 5, characterized in that: The anti-backdraft mechanism (4) includes a rotating shaft (401) and an anti-backdraft cover (402). The anti-backdraft cover (402) is rotatably mounted on the positioning part (2021) via the rotating shaft (401). The anti-backdraft cover (402) is used to open or cover the air vent (302).

7. The anti-backdraft structure of the gas water heater according to claim 6, characterized in that: The upper surface of the sealing ring (3) is provided with an inclined flange (306) arranged around the edge of the air outlet (302). The inclined flange (306) is inclined along the flue gas flow direction toward the axis away from the air outlet (302). The anti-backdraft cover (402) abuts against the inclined flange (306) in the closed state.

8. The anti-backdraft structure of the gas water heater according to claim 6, characterized in that: The annular base (2) is provided with a crossbeam (203), which divides the air vent (302) into two air vents (302). There are two anti-backdraft covers (402), which are used to open or close the two air vents (302) respectively. There are two positioning parts (2021), which are located at the two ends of the crossbeam (203). Each positioning part (2021) has a limiting part (2022) at its end. The limiting part (2022) is set at an angle to the positioning part (2021) and is inclined toward the axis of the annular enclosure (202). The limiting part (2022) is used to limit the maximum opening angle of the two anti-backdraft covers (402).

9. The anti-backdraft structure of the gas water heater according to claim 8, characterized in that: The middle area of ​​the sealing ring (3) is provided with a connecting part (307) corresponding to the crossbeam (203). The crossbeam (203) is provided with a second flange (2031) on both sides. The second flange (2031) is set at a non-flat angle with the crossbeam (203). The bottom wall of the connecting part (307) is provided with a second mounting groove (3071). The side wall of the second mounting groove (3071) is provided with a second groove (3072). The crossbeam (203) is located in the second mounting groove (3071) and the second flange (2031) is embedded in the second groove (3072).

10. The anti-backdraft structure of the gas water heater according to claim 9, characterized in that: The connecting part (307) divides the air vent (302) of the sealing ring (3) into two air vents (302). A second inclined surface (3073) is provided on both sides below the outer wall of the connecting part (307), and the second inclined surface (3073) is inclined toward the axis of the corresponding air vent (302).

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