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 and a sealing ring, a vertically-through channel is formed in the containing cylinder, the annular base is arranged in the channel, the inner wall of the annular base is provided with an inclined face inclining towards the axis of the annular base in the smoke circulation direction, and the sealing ring is matched with the upper surface of the annular base in a clamped mode. The down draft preventing mechanism is arranged on the annular base, the annular base and the sealing ring are provided with air passing openings, and the down draft preventing mechanism is used for opening or covering the air passing openings. The inner wall of the annular base is arranged to be the inclined face, so that the inner wall of the annular base can guide airflow to flow more smoothly, smoke gathers towards the middle of the annular base in the flowing process, and resistance borne by the smoke in the flowing process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hot water supply equipment, in particular to a backdraft prevention structure for a gas water heater. Background Art

[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 to provide hot water.

[0003] In the prior art, since the exhaust pipe of a gas water heater needs to extend outdoors, a backdraft prevention structure is usually installed inside the exhaust pipe to prevent cold air from flowing back into the gas water heater. To ensure the sealing performance of the backdraft prevention structure, a sealing ring is usually installed at the joint where the backdraft prevention cover is attached. However, installing a backdraft prevention structure in the exhaust pipe increases the flow resistance in the exhaust system, which in turn causes the carbon monoxide content in the exhaust gas to exceed the standard. Utility Model Content

[0004] The technical problem solved by the present utility model is to provide a backdraft prevention structure for a gas water heater, which effectively solves the problem of increased flow resistance in the smoke exhaust system caused by the backdraft prevention structure. By setting the inner wall of the annular base to an inclined surface, the inner wall of the annular base can guide the airflow to flow more smoothly, and the smoke gathers toward the middle of the annular base during the flow, thereby reducing the resistance encountered by the smoke during the flow.

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

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

[0007] The accommodating cylinder is provided with a vertically penetrating passage;

[0008] an annular base, disposed in the channel, wherein the inner wall of the annular base has an inclined surface inclined toward the axis of the annular base along the direction of smoke flow;

[0009] A sealing ring, snap-fitted with the upper surface of the annular base;

[0010] The backdraft prevention mechanism is arranged on the annular base. The annular base and the sealing ring have air holes. The backdraft prevention mechanism is used to open or cover the air holes.

[0011] Compared with the background technology, the anti-backdraft structure of the gas water heater described in the present invention has the following beneficial effects: the anti-backdraft mechanism is installed in the gas water heater, and the storage cylinder is connected to the exhaust pipe of the gas water heater, so that the smoke in the gas water heater can be discharged through the anti-backdraft mechanism. When the gas water heater is in operation, the fan of the gas water heater is started, and the wind force blows open the anti-backdraft cover of the anti-backdraft mechanism, so that the anti-backdraft mechanism opens the air outlet, realizes the opening of the channel of the storage cylinder, and smoothly discharges the smoke. When the gas water heater stops operating, the anti-backdraft cover of the anti-backdraft mechanism seals the air outlet, so that the channel of the storage cylinder is closed, and prevents outdoor air from flowing back into the room through the channel of the storage cylinder.

[0012] In addition, since a sealing ring and an annular base are provided in the channel of the accommodating tube, the sealing ring and the annular base are connected by snapping, ensuring that the sealing ring will not fall off easily during long-term use, thereby ensuring the sealing performance of the anti-backdraft structure, effectively preventing cold air from infiltrating from the connection between the sealing ring and the annular base, and at the same time reducing the resistance encountered by the smoke during the flow. Since the inclined surface of the inner wall of the annular base is inclined toward the axis along the direction of smoke flow, the inner wall of the annular base can guide the airflow to flow more smoothly, and the smoke gathers toward the middle of the annular base during the flow, reducing the resistance encountered by the smoke during the flow, reducing the residence time of the smoke in the accommodating tube, and thus reducing the generation of carbon monoxide. At the same time, the inclined surface can also play a guiding role to a certain extent, allowing the smoke to be discharged faster and improving the smoke exhaust efficiency.

[0013] In one embodiment, the accommodating cylinder includes an upper cylinder and a lower cylinder connected to the upper cylinder, the annular base is arranged at the connection between the upper cylinder and the lower cylinder, the bottom of the annular base is provided with an annular flange extending downward, the annular flange is sleeved on the outer wall of the upper cylinder, and the inner wall of the lower cylinder is sleeved on the annular flange.

[0014] In one embodiment, the upper side of the annular base has an inclined ring portion extending upward and inward, the inner wall of the inclined ring portion forms the inclined surface, the lower surface of the sealing ring is configured as an abutment surface adapted to the outer surface of the inclined ring portion, the abutment surface includes a horizontal plane and an inclined plane arranged at an angle to the horizontal plane, the horizontal plane abuts against the top wall of the inclined ring portion, and the inclined plane abuts against the outer wall of the inclined ring portion.

[0015] In one embodiment, one of the upper surface of the annular base or the lower surface of the sealing ring is provided with a buckle, and the other is provided with a groove that cooperates with the buckle.

[0016] In one embodiment, a plurality of the card slots are spaced apart on the upper surface of the annular base, and the card slots are in the shape of long strips and pass through the upper surface and inner wall of the annular base;

[0017] A plurality of buckles are arranged on the inclined surface at intervals.

[0018] In one embodiment, the anti-backwind mechanism includes an axle seat, a rotating shaft and an anti-backwind cover, the axle seat is arranged on the annular base, the anti-backwind cover is rotatably connected to the axle seat through the rotating shaft, and the anti-backwind cover is used to open or close the air outlet.

[0019] In one embodiment, the upper surface of the sealing ring is provided with an inclined flange arranged around the edge of the air outlet, and the inclined flange is inclined along the direction of smoke flow toward the axis away from the air outlet, and the anti-backdraft cover abuts against the inclined flange in the closed state.

[0020] In one embodiment, a crossbeam is provided in the middle area of the annular base, the shaft seat is fixed on the crossbeam, the crossbeam divides the air outlet into two air outlets, and two anti-backflow covers are provided, and the two anti-backflow covers are used to open or cover the two air outlets respectively.

[0021] In one embodiment, a mounting portion is provided in the middle area of the sealing ring, a plurality of raised portions are provided at intervals on the bottom of the shaft seat, and a through groove is provided on the mounting portion corresponding to the raised portions one by one, and the raised portions pass through the through groove and are connected to the crossbeam.

[0022] In one embodiment, a transition fillet is provided at the point where the diameter of the accommodating tube is contracted. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a schematic diagram of an explosion of an anti-backdraft structure of a gas water heater according to an embodiment of the utility model;

[0025] Figure 2 This is a structural schematic diagram of an annular base and a sealing ring in a backdraft prevention structure of a gas water heater according to an embodiment of the utility model;

[0026] Figure 3This is a structural schematic diagram of a central axis seat of a backdraft prevention structure of a gas water heater according to an embodiment of the utility model;

[0027] Figure 4 This is a front view of a backdraft prevention structure of a gas water heater according to an embodiment of the utility model;

[0028] Figure 5 This is a cross-sectional view of a backdraft prevention structure of a gas water heater in a closed state according to an embodiment of the utility model;

[0029] Figure 6 for Figure 5 A partial enlarged view of part A;

[0030] Figure 7 A cross-sectional view of a gas water heater anti-backdraft structure in a closed state according to an embodiment of the present invention from another perspective;

[0031] Figure 8 for Figure 7 A partial enlarged view of part B;

[0032] Figure 9 for Figure 7 A partial enlarged view of part C in the middle;

[0033] Figure 10 This is a cross-sectional view of an anti-backdraft structure of a gas water heater in an open state according to an embodiment of the utility model.

[0034] Description of reference numerals:

[0035] 1. Upper cylinder; 2. Lower cylinder; 201. Transition fillet; 3. Annular base; 301. Inclined surface; 302. Slot; 303. Annular flange; 304. Crossbeam; 3041. Positioning groove; 305. Inclined ring; 4. Sealing ring; 401. Buckle; 402. Abutment surface; 4021. Horizontal surface; 4022. Inclined surface; 403. Air outlet; 404. Inclined flange; 405. Mounting portion; 4051. Mounting slot; 40511. Through slot; 5. Anti-backdraft mechanism; 501. Shaft seat; 5011. Raised portion; 502. Rotating shaft; 503. Anti-backdraft cover; 6. Chimney rubber ring. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0037] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0038] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0040] In the prior art, since the exhaust pipe of a gas water heater needs to extend outdoors, a backdraft prevention structure is often installed inside the exhaust pipe to prevent cold air from flowing back into the gas water heater. To ensure the sealing performance of the backdraft prevention structure, a sealing ring is usually installed where the backdraft prevention cover fits. However, installing a backdraft prevention structure in the exhaust pipe increases the flow resistance in the exhaust system, which in turn causes the carbon monoxide content in the exhaust gas to exceed the standard.

[0041] In order to solve the above technical problems, the following Figures 1 to 10 , describing the embodiments of the present utility model.

[0042] According to the embodiment of the present utility model, Figures 1 to 10 As shown, a backdraft prevention structure for a gas water heater is provided, comprising a receiving cylinder, an annular base 3 and a sealing ring 4.

[0043] Specifically, if Figure 1 、 Figure 4 and Figure 5 As shown, a channel running through the interior of the accommodating cylinder is provided.

[0044] Specifically, if Figure 1 、 Figure 2 、 Figure 5and Figure 6 As shown, the annular base 3 is installed in the channel of the accommodating cylinder, and the inner wall of the annular base 3 is provided with an inclined surface 301, which is inclined toward the axis of the annular base 3 along the direction of smoke flow.

[0045] Specifically, if Figure 1 、 Figure 2 、 Figure 5 and Figure 6 As shown, the sealing ring 4 is connected to the upper surface of the annular base 3 by snapping.

[0046] Specifically, if Figure 1 As shown, the backdraft prevention mechanism 5 is installed on the annular base 3 , and both the annular base 3 and the sealing ring 4 have an air outlet 403 . The backdraft prevention mechanism 5 is used to open or cover the air outlet 403 .

[0047] The backdraft prevention mechanism of this gas water heater is installed in the gas water heater, and the storage cylinder is connected to the exhaust pipe of the gas water heater, so that the smoke in the gas water heater can be discharged through the backdraft prevention mechanism 5. When the gas water heater is in operation, the fan of the gas water heater starts, and the wind force blows open the backdraft prevention cover 503 of the backdraft prevention mechanism 5, so that the backdraft prevention mechanism 5 opens the air vent 403, realizes the opening of the storage cylinder, and smoothly discharges the smoke. When the gas water heater is stopped, the backdraft prevention cover 503 of the backdraft prevention mechanism 5 covers the air vent 403, so that the passage of the storage cylinder is closed, and prevents outdoor air from flowing back into the room through the passage of the storage cylinder.

[0048] In addition, since a sealing ring 4 and an annular base 3 are provided within the channel of the accommodating tube, the sealing ring 4 and the annular base 3 are connected by a snap-fit connection, ensuring that the sealing ring 4 will not easily fall off during long-term use, thereby ensuring the sealing performance of the anti-backdraft structure, effectively preventing cold air from infiltrating from the connection between the sealing ring 4 and the annular base 3, and at the same time reducing the resistance encountered by the smoke during the flow process. Since the inclined surface 301 of the inner wall of the annular base 3 is inclined toward the axis along the direction of smoke flow, the inner wall of the annular base 3 can guide the airflow to flow more smoothly, and the smoke gathers toward the center of the annular base 3 during the flow process, reducing the resistance encountered by the smoke during the flow process, reducing the residence time of the smoke in the accommodating tube, and thus reducing the generation of carbon monoxide. At the same time, the inclined surface 301 can also play a guiding role to a certain extent, allowing the smoke to be discharged more quickly and improving the smoke exhaust efficiency.

[0049] It should be noted that the direction of smoke flow refers to the flow from the bottom of the accommodating cylinder to the top of the accommodating cylinder. It can also be understood that, Figure 4 As shown, the direction of smoke flow is from the upper cylinder 1 toward the lower cylinder 2.

[0050] Specifically, the anti-backwind mechanism 5 can select any existing anti-backwind device. For example, the anti-backwind mechanism 5 can be provided with one anti-backwind cover 503 or two anti-backwind covers 503. In the embodiment of the present application, no specific restrictions are imposed on the structure of the anti-backwind mechanism 5.

[0051] Specifically, the annular base 3, the sealing ring 4 and the anti-backwind mechanism 5 can be set at any position of the channel. In the embodiment of the present application, there is no specific restriction on the setting position of the annular base 3, the sealing ring 4 and the anti-backwind mechanism 5.

[0052] Specifically, the inclination angle of the inclined surface 301 can be adaptively set according to the type of the gas water heater or the size of the sealing ring 4. In the embodiment of the present application, the inclination angle of the inclined surface 301 is not specifically limited.

[0053] In one embodiment, Figure 2 、 Figure 5 and Figure 6 As shown, the accommodating cylinder includes an upper cylinder 1 and a lower cylinder 2, and an annular base 3 is arranged at the connection between the upper cylinder 1 and the lower cylinder 2, wherein the bottom of the annular base 3 is provided with an annular flange 303, and the annular flange 303 extends toward the bottom of the annular base 3, and the annular flange 303 is sleeved on the outer wall of the upper cylinder 1, and the inner wall of the lower cylinder 2 is sleeved on the annular flange 303.

[0054] During the installation of the annular base 3, the annular flange 303 serves as a guide and positioning. The installer only needs to put the annular flange 303 on the upper cylinder 1 and then align the lower cylinder 2 with the annular flange 303 to complete the connection, simplifying the installation process and improving installation efficiency.

[0055] Because the annular flange 303 is mounted on the outer wall of the upper cylinder 1 and the inner wall of the lower cylinder 2 is mounted on the annular flange 303, the connection between the upper and lower cylinders 1 and 2 can be precisely positioned, ensuring that the two exhaust pipes will not be misaligned or offset when connected, making the installation of the entire exhaust system more stable. At the same time, the sealing performance of the entire anti-backdraft structure is improved, reducing the risk of cold air backflow and smoke leakage.

[0056] Specifically, the annular flange 303 is adapted to the diameters of the upper cylinder 1 and the lower cylinder 2 . In the embodiment of the present application, no specific limitation is imposed on the size of the annular flange 303 .

[0057] In one embodiment, Figure 2 、 Figure 5 and Figure 6As shown, the upper side of the annular base 3 has an upwardly and inwardly extending inclined ring portion 305, and the inner wall of the inclined ring portion 305 forms an inclined surface 301. The lower surface of the sealing ring 4 is provided with an abutment surface 402, which is adapted to and abuts the outer surface of the inclined ring portion 305. The abutment surface 402 includes a horizontal surface 4021 and an inclined surface 4022 arranged at an angle to the horizontal surface 4021. The horizontal surface 4021 abuts the top wall of the inclined ring portion 305, and the inclined surface 4022 abuts the outer wall of the inclined ring portion 305.

[0058] The lower surface of the sealing ring 4 is configured as an abutment surface 402 that matches the outer surface of the inclined ring portion 305. This ensures a tight fit between the sealing ring 4 and the annular base 3, ensuring a tight seal at the connection between the sealing ring 4 and the annular base 3. Specifically, the horizontal surface 4021 contacts the top wall of the inclined ring portion 305, providing stable support and sealing. The inclined surface 4022 contacts the outer wall of the inclined ring portion 305, further increasing the contact area. Furthermore, due to the angle between the horizontal surface 4021 and the inclined surface 4022, smoke is effectively prevented from passing directly through the connection between the sealing ring 4 and the annular base 3, improving the seal between the sealing ring 4 and the annular base 3 and effectively preventing smoke leakage and cold air backflow.

[0059] The abutment surface 402 of the sealing ring 4 mates with the outer surface of the inclined ring portion 305, providing a positioning mechanism during installation. By aligning the abutment surface 402 with the inclined ring portion 305, the installer can quickly and accurately install the sealing ring 4, improving installation efficiency and precision. The design of the abutment surface 402 further stabilizes the sealing ring 4 on the annular base 3, preventing it from moving or shaking during use.

[0060] Specifically, the angle between the horizontal plane 4021 and the inclined plane 4022 can be adaptively set according to the structure of the inclined ring portion 305. For example, the inclination angle of the inclined plane 4022 can be consistent with the inclination angle of the inclined plane 301 of the annular base 3. In the embodiment of the present application, there is no specific restriction on the angle between the horizontal plane 4021 and the inclined plane 4022.

[0061] In one embodiment, Figure 2 and Figure 6 As shown, one of the upper surface of the annular base 3 or the lower surface of the sealing ring 4 is provided with a buckle 401 , and the other is provided with a slot 302 that cooperates with the buckle 401 .

[0062] The sealing ring 4 and the annular base 3 are connected by snapping the buckle 401 and the slot 302 together, ensuring that the sealing ring 4 will not fall off easily during long-term use, thereby ensuring the sealing performance of the anti-backdraft structure and effectively preventing cold air from penetrating from the connection between the sealing ring 4 and the annular base 3.

[0063] Specifically, the buckle 401 and the slot 302 can be adaptively set according to the structure of the sealing ring 4 and the annular base 3. For example, the buckle 401 is set as a hook-shaped buckle and the slot 302 is set as a groove slot, or the buckle 401 is set as a mushroom head buckle and the slot 302 is set as a circular slot. In the embodiment of the present application, there is no specific restriction on the structure of the buckle 401 and the slot 302.

[0064] In one embodiment, Figure 6 As shown, a plurality of slots 302 are provided at intervals on the upper surface of the annular base 3. The slots 302 are arranged in a strip shape and pass through the upper surface and inner wall of the annular base 3. A plurality of buckles 401 are provided at intervals on the inclined surface 4022.

[0065] The elongated slot 302 allows the buckle 401 on the sealing ring 4 to be accurately positioned along its length, ensuring precise alignment between the sealing ring 4 and the annular base 3. The slot 302 extends through the upper surface and inner wall of the annular base 3, allowing the buckle 401 to be inserted from the upper surface of the annular base 3 and to slide along the slot 302 during insertion, reducing the time and difficulty of manual adjustment.

[0066] The placement of the clips 401 on the inclined surface 4022 and their spacing allows for a more even distribution of force when the sealing ring 4 is connected to the annular base 3, thereby enhancing the stability of the connection between the sealing ring 4 and the annular base 3. Furthermore, when the sealing ring 4 is connected to the annular base 3, the pressure of the clips 401 combined with the inclination angle of the inclined surface 4022 allows the sealing ring 4 to fit more tightly against the annular base 3, further improving the sealing performance and effectively preventing smoke leakage and cold air backflow.

[0067] Specifically, the plurality of buckles 401 may be evenly spaced and arranged on the inclined surface 4022 , or may be unevenly spaced and arranged on the inclined surface 4022 . In the embodiment of the present application, no specific limitation is imposed on the distribution of the plurality of buckles 401 .

[0068] In one embodiment, Figure 1 As shown, the anti-backwind mechanism 5 includes a shaft seat 501, a rotating shaft 502 and an anti-backwind cover 503, wherein the shaft seat 501 is arranged on the annular base 3, and the anti-backwind cover 503 is rotatably connected to the shaft seat 501 through the rotating shaft 502, and the anti-backwind cover 503 is used to open or cover the air outlet 403.

[0069] The anti-backdraft cover 503 is rotatably mounted on the rotating shaft 502 to provide sealing and anti-backdraft protection, forming a tighter sealing effect, which can more effectively prevent the intrusion of cold air or other pollutants. When the anti-backdraft mechanism 5 is in the covering state, the anti-backdraft cover 503 covers the air outlet 403, ensuring that the anti-backdraft cover 503 can provide a tighter sealing effect.

[0070] Specifically, when the anti-backdraft cover 503 is horizontally disposed, the plane formed by the anti-backdraft cover 503 matches the cross-section of the interior of the upper cylinder 1 or the lower cylinder 2, thereby sealing the upper cylinder 1 or the lower cylinder 2 through the horizontally disposed anti-backdraft cover 503. For example, when the upper cylinder 1 and the lower cylinder 2 are circular tubes, the anti-backdraft cover 503 can be configured in a circular shape, and the diameter of the anti-backdraft cover 503 is the same as the inner diameter of the upper cylinder 1 and the lower cylinder 2.

[0071] In one embodiment, Figure 2 、 Figure 8 and Figure 9 As shown, the upper surface of the sealing ring 4 is provided with an inclined flange 404, which is arranged around the edge of the air outlet 403, and the inclined flange 404 is inclined along the direction of smoke flow toward the axis away from the air outlet 403, and the anti-backdraft cover 503 is in contact with the inclined flange 404 in the closed state.

[0072] When closed, the anti-draft cover 503 abuts the inclined flange 404. This not only prevents the ingress of outside air, but also enhances the sealing effect of the inclined flange 404, effectively preventing the backflow of cold air and smoke leakage. Furthermore, because the inclined flange 404 is tilted along the direction of smoke flow, away from the axis of the air outlet 403, it automatically adjusts its fit with the anti-draft cover 503 under varying pressures, maintaining a consistently good seal and effectively preventing the abnormal flow of air and smoke under various operating conditions.

[0073] In one embodiment, Figure 2 and Figure 3 As shown, a crossbeam 304 is provided in the middle area of the annular base 3, and the crossbeam 304 divides the air outlet 403 into two air outlets 403. Two anti-backdraft covers 503 are provided, and the two anti-backdraft covers 503 are corresponding to the two air outlets 403. The two anti-backdraft covers 503 are respectively used to open or cover the two air outlets 403.

[0074] By setting a crossbeam 304 on the annular base 3, the crossbeam 304 divides the air outlet 403 into two air outlets 403, and the two anti-backdraft covers 503 are rotatably set on both sides of the rotating shaft 502, two-way sealing and anti-backdraft protection can be provided, forming a tighter sealing effect, which can more effectively prevent the invasion of cold air or other pollutants.

[0075] In one embodiment, Figure 2 and Figure 3 As shown, the middle region of the sealing ring 4 is provided with a mounting portion 405, and the bottom of the shaft seat 501 is provided with a plurality of raised portions 5011 at intervals. A through-groove 40511 is defined within the mounting portion 405, and the through-groove 40511 corresponds to each raised portion 5011. The raised portions 5011 pass through the through-groove 40511 and connect to the crossbeam 304.

[0076] Since the bottom of the shaft seat 501 is provided with multiple protrusions 5011, when installing the shaft seat 501, the protrusions 5011 at the bottom of the shaft seat 501 are passed through the through grooves 40511 in the mounting portion 405 and connected to the crossbeam 304, so that the shaft seat 501 is firmly fixed on the annular base 3, thereby enhancing the stability of the entire structure and avoiding the shaft seat 501 from loosening or shifting during long-term use.

[0077] When installing the shaft seat 501, the through-groove 40511 can, on the one hand, pre-position the protrusion 5011 of the shaft seat 501, thereby facilitating quick installation of the shaft seat 501 to the predetermined position. Furthermore, the through-groove 40511 can provide a clearance, allowing the protrusion 5011 to directly contact the annular base 3 after passing through the through-groove 40511, thereby facilitating connection between the protrusion 5011 and the annular base 3.

[0078] Specifically, a mounting groove 4051 is opened on the mounting portion 405 corresponding to the shaft seat 501, so that the shaft seat 501 can be accurately installed in the specified position of the sealing ring 4, ensuring the accurate installation of the anti-backwind mechanism 5 and improving the overall installation accuracy and stability of the anti-backwind mechanism 5.

[0079] In addition, the mounting groove 4051 can firmly fix the shaft seat 501 on the sealing ring 4, making the connection between the shaft seat 501 and the sealing ring 4 tighter, preventing the shaft seat 501 from loosening or falling off, thereby ensuring the normal operation of the anti-backwind mechanism 5.

[0080] Specifically, a positioning groove 3041 is formed on the crossbeam 304 to cooperate with the mounting portion 405 on the sealing ring 4 , and the mounting portion 405 is positioned by the positioning groove 3041 .

[0081] In one embodiment, Figure 4 and Figure 5 As shown, a transition fillet 201 is provided at the tube diameter contraction portion of the lower cylinder 2 .

[0082] By providing the transition fillet 201 on the lower cylinder 2, the structure of the lower cylinder 2 presents a streamlined shape that is more in line with aerodynamics, thereby reducing the resistance encountered by the smoke during the flow process.

[0083] Specifically, a plurality of transition fillets 201 may be arranged at intervals along the axial direction of the lower cylinder 2 . In the embodiment of the present application, the number of the transition fillets 201 is not specifically limited.

[0084] Specifically, if Figure 6 As shown, it also includes a chimney rubber ring 6, which can be embedded on the inner wall of the upper cylinder 1.

[0085] The assembly process of the anti-backdraft structure of the gas water heater in this embodiment is described as follows:

[0086] First, engage the buckle 401 of the sealing ring 4 with the slot 302 of the annular base 3, and at the same time install the mounting portion 405 of the sealing ring 4 in the positioning slot 3041 of the crossbeam 304 of the annular base 3, so that the abutting surface 402 of the sealing ring 4 is fully in contact with the upper surface of the annular base 3 to ensure the sealing of the connection between the sealing ring 4 and the annular base 3.

[0087] Then, the two anti-backflow covers 503 are rotated and set on the shaft seat 501 through the rotating shaft 502, and the raised portion 5011 at the bottom of the shaft seat 501 passes through the through groove 40511 in the installation groove 4051 and is welded to the crossbeam 304, so that the shaft seat 501 is fixed on the annular base 3.

[0088] Finally, the annular flange 303 of the annular base 3 is sleeved on the outer wall of the upper cylinder 1, and then the inner wall of the lower cylinder 2 is sleeved on the annular flange 303 to complete the assembly of the anti-backwind structure.

[0089] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features 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.

[0090] The specific contents of the above-mentioned specific embodiments only express several embodiments of the present invention. Although the description is relatively specific and detailed, it should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the appended claims.

Claims

1. A backdraft prevention structure for a gas water heater, characterized in that: include: The accommodating cylinder is provided with a vertically penetrating passage; An annular base (3) is provided in the channel, and an inner wall of the annular base (3) has an inclined surface (301) inclined toward the axis of the annular base (3) along the direction of smoke flow; A sealing ring (4) is snap-fitted with the upper surface of the annular base (3); The backdraft prevention mechanism (5) is provided on the annular base (3); the annular base (3) and the sealing ring (4) have an air outlet (403); and the backdraft prevention mechanism (5) is used to open or cover the air outlet (403).

2. The anti-backdraft structure of the gas water heater according to claim 1, characterized in that: The accommodating cylinder comprises an upper cylinder (1) and a lower cylinder (2) connected to the upper cylinder (1); the annular base (3) is arranged at the connection between the upper cylinder (1) and the lower cylinder (2); the bottom of the annular base (3) is provided with an annular flange (303) extending downward; the annular flange (303) is sleeved on the outer wall of the upper cylinder (1); and the inner wall of the lower cylinder (2) is sleeved on the annular flange (303).

3. The anti-backdraft structure of the gas water heater according to claim 1, characterized in that: The upper side of the annular base (3) has an inclined ring portion (305) extending upward and inward, the inner wall of the inclined ring portion (305) forms the inclined surface (301), the lower surface of the sealing ring (4) is configured as an abutment surface (402) adapted to the outer surface of the inclined ring portion (305), the abutment surface (402) comprising a horizontal surface (4021) and an inclined surface (4022) arranged at an angle to the horizontal surface (4021), the horizontal surface (4021) abuts against the top wall of the inclined ring portion (305), and the inclined surface (4022) abuts against the outer wall of the inclined ring portion (305).

4. The anti-backdraft structure of the gas water heater according to claim 3, characterized in that: One of the upper surface of the annular base (3) or the lower surface of the sealing ring (4) is provided with a buckle (401), and the other is provided with a slot (302) that cooperates with the buckle (401).

5. The anti-backdraft structure of the gas water heater according to claim 4, characterized in that: A plurality of the card slots (302) are provided at intervals on the upper surface of the annular base (3); the card slots (302) are in the shape of long strips and penetrate the upper surface and inner wall of the annular base (3); A plurality of the buckles (401) are arranged at intervals on the inclined surface (4022).

6. The anti-backdraft structure of a gas water heater according to any one of claims 1 to 5, characterized in that: The anti-backflow mechanism (5) comprises a shaft seat (501), a rotating shaft (502) and an anti-backflow cover (503); the shaft seat (501) is arranged on the annular base (3); the anti-backflow cover (503) is rotatably connected to the shaft seat (501) via the rotating shaft (502); and the anti-backflow cover (503) is used to open or cover the air outlet (403).

7. The anti-backdraft structure of the gas water heater according to claim 6, characterized in that: The upper surface of the sealing ring (4) is provided with an inclined flange (404) arranged around the edge of the air outlet (403), and the inclined flange (404) is inclined along the smoke flow direction toward the axis away from the air outlet (403), and the anti-backdraft cover (503) is in contact with the inclined flange (404) in the closed state.

8. The anti-backdraft structure of the gas water heater according to claim 7, characterized in that: A crossbeam (304) is provided in the middle area of the annular base (3), the shaft seat (501) is fixed on the crossbeam (304), the crossbeam (304) divides the air outlet (403) into two air outlets (403), and two anti-backflow covers (503) are provided, and the two anti-backflow covers (503) are used to open or cover the two air outlets respectively.

9. The anti-backdraft structure of the gas water heater according to claim 8, characterized in that: A mounting portion (405) is provided in the middle area of the sealing ring (4), a plurality of raised portions (5011) are provided at intervals on the bottom of the shaft seat (501), and a through groove (40511) corresponding to each of the raised portions (5011) is provided on the mounting portion (405), and the raised portions (5011) pass through the through groove (40511) and are connected to the crossbeam (304).

10. The anti-backdraft structure of a gas water heater according to any one of claims 1 to 5, characterized in that: A transition fillet (201) is provided at the location where the diameter of the accommodating tube is contracted.

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