Dual downdraft prevention structure of gas water heater

Abstract

The utility model relates to the technical field of hot water supply equipment, and discloses a dual downdraft prevention structure of a gas water heater. The dual-downdraft-prevention structure of the gas water heater comprises a containing cylinder, a first downdraft-prevention mechanism and a second downdraft-prevention mechanism, the first downdraft-prevention mechanism is arranged in a first channel and comprises a first shaft seat, a first rotating shaft and two first downdraft-prevention covers, and the two first downdraft-prevention covers are rotatably arranged on the first shaft seat through the first rotating shaft; the two first down draft preventing covers are used for opening or closing the first channel, the second down draft preventing mechanism comprises a second shaft seat, a second rotating shaft and a second down draft preventing cover, and the second down draft preventing cover is rotatably arranged on the second shaft seat through the second rotating shaft. According to the utility model, the double-door type first downdraft-preventing mechanism and the single-door type second downdraft-preventing mechanism are arranged in the accommodating cylinder, so that the downdraft-preventing sealing effect is ensured, the assembly of the double downdraft-preventing structure is facilitated, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hot water supply equipment, in particular to a double 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 existing technology, 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 outdoor air from flowing back into the gas water heater. In areas with strong winds, two backdraft prevention mechanisms are required to achieve an effective seal. However, the two backdraft prevention mechanisms are currently installed separately for this purpose, making the installation of the dual backdraft prevention structure complicated and costly. Utility Model Content

[0004] The technical problem solved by the present invention is to provide a double anti-backdraft structure for a gas water heater, which effectively solves the problem of complicated and high-cost installation of the double anti-backdraft structure. By installing a first double-door anti-backdraft mechanism and a second single-door anti-backdraft mechanism in the accommodating cylinder, the sealing effect of the anti-backdraft is ensured, the assembly of the double anti-backdraft structure is facilitated, and the production cost is reduced.

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

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

[0007] The accommodating cylinder has a first channel and a second channel connected in series.

[0008] a first backdraft prevention mechanism, disposed in the first channel, the first backdraft prevention mechanism comprising a first shaft seat, a first rotating shaft, and two first backdraft prevention covers, the two first backdraft prevention covers being rotatably disposed on the first shaft seat via the first rotating shaft, the two first backdraft prevention covers being used to open or close the first channel;

[0009] The second backwind prevention mechanism is arranged in the second channel. The second backwind prevention mechanism includes a second shaft seat, a second rotating shaft and a second backwind prevention cover. The second backwind prevention cover is rotatably arranged on the second shaft seat through the second rotating shaft. The second backwind prevention cover is used to open or close the second channel.

[0010] Compared with the background technology, the double backdraft prevention structure of the gas water heater described in the present invention has the following beneficial effects: the double backdraft prevention structure 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 storage cylinder. Taking the first backdraft prevention mechanism arranged above the second backdraft prevention mechanism as an example, when the gas water heater is in operation, the fan of the gas water heater is started, and the wind force first blows open the second backdraft prevention cover of the second backdraft prevention mechanism, so that the second backdraft prevention mechanism opens the second channel, and then the smoke enters the first channel through the second channel. Similarly, the wind force blows open the first backdraft prevention cover of the first backdraft prevention mechanism, so that the first backdraft prevention mechanism opens the first channel, and then the smoke is discharged smoothly. When the gas water heater stops running, the first backdraft prevention cover and the second backdraft prevention cover close the first channel and the second channel respectively under the action of gravity, so that the channel of the storage cylinder is closed. Compared with a single anti-backdraft structure, the double anti-backdraft structure can more effectively prevent outdoor cold air from flowing back into the gas water heater, greatly improving the anti-backdraft effect and thus better protecting the normal operation of the gas water heater.

[0011] In addition, the first anti-backwind mechanism and the second anti-backwind mechanism are integrated in a accommodating tube, and the first anti-backwind mechanism and the second anti-backwind mechanism can be installed as separate modules. The two first anti-backwind covers are installed on the first shaft seat through the first rotating shaft, and the second anti-backwind cover is installed on the second shaft seat through the second rotating shaft. The structure is simple, which simplifies the installation process. At the same time, the first anti-backwind mechanism adopts a double-door design, which has better sealing performance; the second anti-backwind mechanism adopts a single-door design, which is relatively easy to assemble and has lower cost. Installing the first anti-backwind mechanism and the second anti-backwind mechanism in the accommodating tube not only ensures the sealing effect of the anti-backwind, but also facilitates the assembly of the double anti-backwind structure, thereby reducing production costs.

[0012] In one embodiment, the first anti-backwind mechanism is arranged above the second anti-backwind mechanism, the first channel is formed between the first anti-backwind mechanism and the second anti-backwind mechanism, and the second channel is formed between the second anti-backwind mechanism and the bottom end of the accommodating tube.

[0013] In one embodiment, the first rotation axis and the second rotation axis are perpendicular to each other.

[0014] In one embodiment, the first anti-backwind mechanism also includes a first sealing ring and an annular base, the first sealing ring is arranged on the annular base and is clamped with the annular base, the first shaft seat is installed on the annular base, and the two first anti-backwind covers are arranged above the first sealing ring and are used to open or cover the air outlet of the first sealing ring.

[0015] In one embodiment, the lower surface of the first sealing ring abuts against the upper surface of the annular base, the inner ring of the annular base is provided with a flange extending downward, the inner wall of the first sealing ring is provided with a hook extending downward and toward the flange, and the hook is provided with a groove corresponding to the flange, and the first sealing ring and the annular base are clamped with the flange through the groove.

[0016] In one embodiment, the upper surface of the first sealing ring is provided with a first inclined flange arranged around the edge of the air outlet, and the first inclined flange is inclined along the smoke flow direction toward the axis away from the air outlet, and the first anti-backdraft cover is in contact with the first inclined flange in the closed state.

[0017] In one embodiment, the accommodating cylinder includes a first cylinder body and a second cylinder body connected to the first cylinder body, the first cylinder body is inserted into the second cylinder body through the mounting end, and an annular cavity is formed between the outer wall of the first cylinder body close to the mounting end and the inner wall of the second cylinder body, the second shaft seat is installed in the annular cavity, the second anti-backwind mechanism includes a second sealing ring, the second sealing ring is sleeved on the mounting end, and the second anti-backwind cover is provided above the second sealing ring and is used to open or cover the air outlet of the second sealing ring.

[0018] In one embodiment, a bending portion is provided at the end of the mounting end, a mounting groove is provided at the bottom of the second sealing ring corresponding to the bending portion, and the first cylinder and the second sealing ring are clamped with the mounting groove through the bending portion.

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

[0020] In one embodiment, the distance between the first rotating shaft and the second rotating shaft is a, 69 mm ≤ a ≤ 75 mm;

[0021] The height of the accommodating cylinder is h, 163mm≤h≤167mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic diagram of an explosion of a double anti-backdraft structure of a gas water heater according to an embodiment of the utility model;

[0024] Figure 2 This is a side view of a double anti-backdraft structure of a gas water heater according to an embodiment of the present utility model;

[0025] Figure 3 This is a cross-sectional view of a double anti-backdraft structure of a gas water heater in a closed state according to an embodiment of the present utility model;

[0026] Figure 4 for Figure 3 A partial enlarged view of the

[0027] Figure 5 A cross-sectional view of a double anti-backdraft structure of a gas water heater according to an embodiment of the present invention in a closed state from another perspective;

[0028] Figure 6 for Figure 5 A partial enlarged view of part A;

[0029] Figure 7 This is a cross-sectional view of a double anti-backdraft structure of a gas water heater in an open state according to an embodiment of the present utility model;

[0030] Figure 8 A cross-sectional view of a double anti-backdraft structure of a gas water heater according to an embodiment of the present invention in an open state from another perspective;

[0031] Figure 9 for Figure 7 A top view of the double anti-backdraft structure of the gas water heater shown.

[0032] Description of reference numerals:

[0033] 1. Accommodating cylinder; 101. First channel; 102. Second channel; 103. First cylinder; 1031. Mounting end; 10311. Bending portion; 104. Second cylinder; 105. Third exhaust pipe; 106. Sealing ring; 2. First anti-backdraft mechanism; 201. First shaft seat; 202. First rotating shaft; 203. First anti-backdraft cover; 204. First sealing ring; 2042. Hook; 20421. Slot; 2043. First inclined flange; 205. Annular base; 2051. Flanging; 3. Second anti-backdraft mechanism; 301. Second shaft seat; 302. Second rotating shaft; 303. Second anti-backdraft cover; 304. Second sealing ring; 3041. Mounting slot; 3042. Second inclined flange; 4. Chimney rubber ring; 5. Annular cavity. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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 outdoor air from flowing back into the gas water heater. In areas with strong winds, two backdraft prevention mechanisms are required to achieve an effective seal. However, currently, the two backdraft prevention mechanisms for this purpose are installed separately, making the installation of the dual backdraft prevention structure complex and costly.

[0039] In order to solve the above technical problems, the following Figures 1 to 9 Shown, an embodiment of the present utility model is described.

[0040] According to an embodiment of the present invention, on the one hand, Figures 1 to 9As shown, a dual backdraft prevention structure for a gas water heater is provided, comprising a receiving tube 1, a first backdraft prevention mechanism 2 and a second backdraft prevention mechanism 3.

[0041] Specifically, if Figures 1 to 3 As shown, a first channel 101 and a second channel 102 are provided in the accommodating cylinder 1 and are interconnected and arranged in series.

[0042] Specifically, combined Figures 1 to 7 As shown, the first backdraft prevention mechanism 2 is disposed in the first passage 101. The first backdraft prevention mechanism 2 includes a first shaft seat 201, a first rotating shaft 202, and two first backdraft prevention covers 203. The two first backdraft prevention covers 203 are rotatably mounted on the first shaft seat 201 via the first rotating shaft 202. The two first backdraft prevention covers 203 are used to open or close the first passage 101.

[0043] Specifically, combined Figures 1 to 4 As shown, the second backdraft prevention mechanism 3 is disposed in the second passage 102. The second backdraft prevention mechanism 3 includes a second shaft seat 301, a second rotating shaft 302, and a second backdraft prevention cover 303, wherein the second backdraft prevention cover 303 is rotatably mounted on the second shaft seat 301 via the second rotating shaft 302, and the second backdraft prevention cover 303 is used to open or close the second passage 102.

[0044] The double anti-backdraft structure of this gas water heater is installed in the gas water heater, and the accommodating cylinder 1 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 accommodating cylinder 1. Taking the first anti-backdraft mechanism 2 arranged above the second anti-backdraft mechanism 3 as an example, when the gas water heater is in operation, the fan of the gas water heater is started, and the wind force first blows open the second anti-backdraft cover 303 of the second anti-backdraft mechanism 3, so that the second anti-backdraft mechanism 3 opens the second channel 102, and then the smoke enters the first channel 101 through the second channel 102. The first anti-backdraft cover 203 of the first anti-backdraft mechanism 2 is also blown open by the wind force, so that the first anti-backdraft mechanism 2 opens the first channel 101, and then the smoke is discharged smoothly. When the gas water heater stops operating, the first anti-backdraft cover 203 and the second anti-backdraft cover 303 respectively close the first channel 101 and the second channel 102 under the action of gravity, so that the channel of the accommodating cylinder 1 is closed. Compared with a single anti-backdraft structure, the double anti-backdraft structure can more effectively prevent outdoor cold air from flowing back into the gas water heater, greatly improving the anti-backdraft effect and thus better protecting the normal operation of the gas water heater.

[0045] In addition, the first anti-backwind mechanism 2 and the second anti-backwind mechanism 3 are integrated into a accommodating tube 1, and the first anti-backwind mechanism 2 and the second anti-backwind mechanism 3 can be installed as separate modules. The two first anti-backwind covers 203 are installed on the first shaft seat 201 through the first rotating shaft 202, and the second anti-backwind cover 303 is installed on the second shaft seat 301 through the second rotating shaft 302. The structure is simple, which simplifies the installation process. At the same time, the first anti-backwind mechanism 2 adopts a double-door design and has good sealing performance; the second anti-backwind mechanism 3 adopts a single-door design, which is relatively easy to assemble and has low cost. Installing the first anti-backwind mechanism 2 and the second anti-backwind mechanism 3 in the accommodating tube 1 not only ensures the sealing effect of the anti-backwind, but also facilitates the assembly of the double anti-backwind structure, thereby reducing production costs.

[0046] Specifically, the second anti-backdraft mechanism 3 can also be arranged above the first anti-backdraft mechanism 2. When the gas water heater is in operation, the fan of the gas water heater is started, and the first anti-backdraft cover 203 of the first anti-backdraft mechanism 2 is blown open by wind force, so that the first anti-backdraft mechanism 2 opens the first channel 101, and then the flue gas enters the second channel 102 through the first channel 101. Similarly, the second anti-backdraft cover 303 of the second anti-backdraft mechanism 3 is blown open by wind force, so that the second anti-backdraft mechanism 3 opens the second channel 102, and then the flue gas is discharged smoothly.

[0047] Specifically, the accommodating cylinder 1 can be provided in any cylindrical shape, such as a straight cylinder or a bent cylinder. In the embodiment of the present application, the shape of the accommodating cylinder 1 is not limited.

[0048] For example, in order to improve the smoke exhaust efficiency and facilitate the installation of the accommodating cylinder 1, the accommodating cylinder 1 can be configured to be a straight cylinder.

[0049] Specifically, if the accommodating cylinder 1 is a circular tube, the plane formed by the two first anti-backdraft covers 203 in the closed state is circular, and each first anti-backdraft cover 203 is arranged to be semicircular. In the embodiment of the present application, there is no specific restriction on the shape of the first anti-backdraft cover 203.

[0050] Specifically, if the accommodating tube 1 is a circular tube, the second anti-backdraft cover 303 can be set to be circular. If the accommodating tube 1 is a square tube, the second anti-backdraft cover 303 can be set to be square. In the embodiment of the present application, there is no specific restriction on the shape of the second anti-backdraft cover 303.

[0051] In one embodiment, Figure 2 As shown, the first anti-backwind mechanism 2 is arranged above the second anti-backwind mechanism 3. A first channel 101 is formed between the first anti-backwind mechanism 2 and the second anti-backwind mechanism 3, and a second channel 102 is formed between the second anti-backwind mechanism 3 and the bottom end of the accommodating tube 1.

[0052] The first backdraft prevention mechanism 2 is disposed above the second backdraft prevention mechanism 3. When the gas water heater is in operation, the fan first blows open the second backdraft prevention cover 303 below, allowing the smoke to ascend and enter the first channel 101 before blowing open the first backdraft prevention cover 203 to be discharged. Since the second backdraft prevention mechanism 3 is a single-door design, disposing the second backdraft prevention mechanism 3 below the first backdraft prevention mechanism 2 makes the dual backdraft prevention structure more compact, fully utilizing the internal space of the accommodating tube 1 and making the entire backdraft prevention structure more compact and reasonable.

[0053] In one embodiment, Figure 3 and Figure 4 As shown, the first rotating shaft 202 and the second rotating shaft 302 are arranged perpendicular to each other.

[0054] Since the second anti-backflow mechanism 3 is a single-door design, the opening angle of the second anti-backflow cover 303 is less than 90°. Figure 9 As shown), since the first rotating shaft 202 and the second rotating shaft 302 are arranged perpendicular to each other, when the second anti-backdraft cover 303 is fully opened, a portion of the first rotating shaft 202 is located within the projection area of ​​the second anti-backdraft cover 303, ensuring that the projection area of ​​the first rotating shaft 202 exposed to the passage of smoke is reduced to a minimum, thereby ensuring smooth smoke circulation.

[0055] If the first rotating axis 202 and the second rotating axis 302 are parallel to each other, the first rotating axis 202 is relatively large in the projected area through which the smoke passes, thereby hindering the flow of the smoke.

[0056] In one embodiment, Figure 1 、 Figure 5 and Figure 6 As shown, the first backdraft prevention mechanism 2 further includes a first sealing ring 204 and an annular base 205. The first sealing ring 204 is disposed above the annular base 205 and is engaged with the annular base 205. The first shaft seat 201 is mounted on the annular base 205. Two first backdraft prevention covers 203 are disposed above the first sealing ring 204. The two first backdraft prevention covers 203 are used to open or cover the air passage of the first sealing ring 204.

[0057] The first sealing ring 204 is connected to the annular base 205 by snapping, ensuring that the first sealing ring 204 will not fall off easily during long-term use, thereby ensuring the sealing performance of the first anti-backdraft mechanism 2, effectively preventing cold air from infiltrating from the connection between the first sealing ring 204 and the annular base 205, and reducing the resistance encountered by the smoke during the flow process.

[0058] Install the first shaft seat 201 on the annular base 205 to ensure that the first shaft seat 201 is firmly fixed. When the first anti-draft cover 203 is in the closed state, the first anti-draft cover 203 covers the air outlet of the first sealing ring 204, ensuring that the first anti-draft cover 203 can provide a tighter sealing effect. When the first anti-draft cover 203 is in the open state, the first anti-draft cover 203 opens the air outlet of the first sealing ring 204, ensuring that smoke can pass through the air outlet smoothly.

[0059] In one embodiment, Figure 5 and Figure 6 As shown, the lower surface of the first sealing ring 204 also abuts the upper surface of the annular base 205. The inner ring of the annular base 205 is provided with a downwardly extending flange 2051, and the inner wall of the first sealing ring 204 is provided with a hook 2042, which extends downward and toward the flange 2051. The hook 2042 is provided with a slot 20421 corresponding to the flange 2051, and the first sealing ring 204 and the annular base 205 are engaged with each other through the slot 20421 and the flange 2051.

[0060] Because the lower surface of the first sealing ring 204 abuts the upper surface of the annular base 205, the upper surface of the annular base 205 provides a stable support surface for the first sealing ring 204, making it less likely to deform or move when under pressure. At the same time, the engagement between the groove 20421 of the hook 2042 and the flange 2051 further restricts the movement of the first sealing ring 204 in all directions, ensuring a secure fit between the first sealing ring 204 and the annular base 205, thereby providing a reliable sealing effect and effectively preventing the backflow of cold air.

[0061] Specifically, a plurality of hooks 2042 may be provided on the first sealing ring 204 . The plurality of hooks 2042 may be arranged at even intervals or at uneven intervals. In the embodiment of the present application, the number of the hooks 2042 is not specifically limited.

[0062] In one embodiment, Figure 5 and Figure 6 As shown, the upper surface of the first sealing ring 204 is provided with a first inclined flange 2043, which is arranged around the edge of the air outlet. The first inclined flange 2043 is inclined along the direction of smoke flow toward the axis away from the air outlet. When the first anti-draft cover 203 is in the closed state, it abuts against the first inclined flange 2043.

[0063] When sealed, the first anti-draft cover 203 abuts the first inclined flange 2043. This not only prevents the ingress of outside air, but also enhances the sealing effect, effectively preventing the backflow of cold air and smoke leakage. Furthermore, because the first inclined flange 2043 is tilted along the direction of smoke flow, away from the axis of the air outlet, it automatically adjusts its fit with the first anti-draft cover 203 under varying pressures, maintaining a consistently good seal and effectively preventing abnormal air and smoke flow under various operating conditions.

[0064] In one embodiment, Figure 1 、 Figure 3 and Figure 4 As shown, the accommodating cylinder 1 includes a first cylinder 103 and a second cylinder 104, and the first cylinder 103 is connected to the second cylinder 104. The first cylinder 103 is inserted into the interior of the second cylinder 104 through the mounting end 1031. An annular cavity 5 is formed between the outer wall of the first cylinder 103 near the mounting end 1031 and the inner wall of the second cylinder 104. The second shaft seat 301 is installed in the annular cavity 5.

[0065] The second anti-backdraft mechanism 3 includes a second sealing ring 304, which is sleeved on the mounting end 1031. The second anti-backdraft cover 303 is arranged above the second sealing ring 304, and the second anti-backdraft cover 303 is used to open or cover the air outlet of the second sealing ring 304.

[0066] The mounting end 1031 of the first cylinder 103 extends into the second cylinder 104 and an annular cavity 5 is left between the two, that is, the diameter of the first cylinder 103 is smaller than the diameter of the second cylinder 104. When assembling the accommodating cylinder 1 and the second anti-backwind mechanism 3, the mounting end 1031 of the first cylinder 103 is inserted into the second cylinder 104, and the second shaft seat 301 is installed in the annular cavity 5 to complete the assembly, simplifying the installation steps and making the double anti-backwind structure more compact, which helps to improve installation efficiency and reduce installation difficulty.

[0067] The second sealing ring 304 is sleeved on the mounting end 1031 of the first cylinder 103, and the second anti-backdraft cover 303 is set on the second sealing ring 304. When the second anti-backdraft cover 303 is in a closed state, the second anti-backdraft cover 303 is covered on the mounting end 1031 and seals the air outlet of the second sealing ring 304, ensuring that the second anti-backdraft mechanism 3 has good sealing performance and effectively preventing outdoor cold air from flowing back into the gas water heater.

[0068] Specifically, since the diameter of the second cylinder 104 is larger than that of the first cylinder 103, the second anti-backdraft cover 303 is disposed within the second cylinder 104. Therefore, the diameter of the second anti-backdraft cover 303 can be configured to match the diameter of the second cylinder 104. Therefore, the diameter of the second anti-backdraft cover 303 is larger than the diameter of the mounting end 1031 of the first cylinder 103. In other words, when the second anti-backdraft cover 303 is disposed on the second sealing ring 304, the second anti-backdraft cover 303 can completely cover the air passage of the second sealing ring 304, thereby ensuring the sealing performance of the second anti-backdraft mechanism 3.

[0069] Specifically, since the diameter of the second cylinder 104 is larger than that of the first cylinder 103, when the second cylinder 104 is connected to the first cylinder 103, a sealing ring 106 can be provided at the connection between the second cylinder 104 and the first cylinder 103 to ensure a firm connection between the first cylinder 103 and the second cylinder 104 and to provide good sealing. At the same time, the second shaft seat 301 of the spacing can be installed on the sealing ring 106.

[0070] Specifically, if Figures 1 to 3 As shown, the accommodating tube 1 further includes a third smoke exhaust pipe 105 , which is sleeved with the second tube body 104 , and the first backdraft prevention mechanism 2 can be installed in the third smoke exhaust pipe 105 .

[0071] In one embodiment, Figure 4 As shown, the end of the mounting end 1031 is provided with a bent portion 10311, and the bottom of the second sealing ring 304 is provided with a mounting groove 3041, which is corresponding to the bent portion 10311. The first cylinder 103 and the second sealing ring 304 are clamped together through the bent portion 10311 and the mounting groove 3041.

[0072] A bending portion 10311 is provided at the end of the mounting end 1031 of the first cylinder 103, and a mounting groove 3041 is correspondingly provided at the bottom of the second sealing ring 304. The bending portion 10311 is engaged with the mounting groove 3041, so that the second sealing ring 304 can be effectively fixed on the first cylinder 103, so that the second sealing ring 304 will not be easily displaced during operation, ensuring that the sealing ring is always in a position where it can provide the best sealing effect, thereby improving the sealing stability of the second anti-backflow mechanism 3 and reducing the possibility of cold air backflow.

[0073] When installing the second sealing ring 304 , the installer only needs to align the bent portion 10311 with the installation groove 3041 and snap it in place. This operation is simple and quick, thereby improving installation efficiency.

[0074] Specifically, the bending portion 10311 can be set to any existing shape such as a triangle, a square or a circle. In the embodiment of the present application, there is no specific limitation on the structure of the bending portion 10311.

[0075] In one embodiment, Figure 4 As shown, the upper surface of the second sealing ring 304 is provided with a second inclined flange 3042, which is arranged around the edge of the air outlet. The second inclined flange 3042 is arranged to be inclined along the direction of smoke flow toward the axis away from the air outlet. When the second anti-backdraft cover 303 is in the closed state, it abuts against the second inclined flange 3042.

[0076] When closed, the second anti-draft cover 303 abuts the second inclined flange 3042. This not only prevents the ingress of outside air, but also enhances the sealing effect, effectively preventing the backflow of cold air and smoke leakage. Furthermore, because the second inclined flange 3042 is tilted along the direction of smoke flow, away from the axis of the air outlet, it automatically adjusts its fit with the second anti-draft cover 303 under varying pressures, maintaining a consistently good seal and effectively preventing the abnormal flow of air and smoke under various operating conditions.

[0077] In one embodiment, Figure 8 As shown, the distance between the first rotating shaft 202 and the second rotating shaft 302 is a, 69mm≤a≤75mm. The height of the accommodating cylinder 1 is h, 163mm≤h≤167mm.

[0078] Limiting the distance between the first rotating shaft 202 and the second rotating shaft 302 to between 69 mm and 75 mm, and limiting the height of the accommodating tube 1 to between 163 mm and 167 mm, can make the layout of the first anti-backdraft mechanism 2 and the second anti-backdraft mechanism 3 more reasonable within the accommodating tube 1. At the same time, within this size range, the various components can fit closely together, ensuring the compactness and coordination of the entire anti-backdraft structure.

[0079] Specifically, if Figure 7 and Figure 8 As shown, a chimney rubber ring 4 is also included, which can be embedded on the inner wall of the first cylinder 103 .

[0080] The assembly process of the double anti-backdraft structure of the gas water heater in this embodiment is described as follows:

[0081] First, assemble the first anti-backdraft mechanism 2, install the first sealing ring 204 on the annular base 205 and engage it with the annular base 205, then rotatably install the two first anti-backdraft covers 203 on the first shaft seat 201 through the first rotating shaft 202, and fix the first shaft seat 201 on the annular base 205 to complete the assembly of the first anti-backdraft mechanism 2.

[0082] Then, the first anti-backdraft mechanism 2 is installed at the connection between the second cylinder 104 and the third smoke exhaust pipe 105 .

[0083] Subsequently, the second backdraft prevention mechanism 3 is assembled, and the second sealing ring 304 is mounted on the mounting end 1031 of the first cylinder 103. The first cylinder 103 and the second sealing ring 304 are connected by engaging the bent portion 10311 with the mounting groove 3041. The sealing ring 106 is then fixed to the outer wall of the first cylinder 103, and the second shaft seat 301 is fixed to the sealing ring 106. The second backdraft prevention cover 303 is rotatably mounted on the second shaft seat 301 via the second rotating shaft 302, completing the assembly of the second backdraft prevention mechanism 3.

[0084] Finally, the mounting end 1031 of the first cylinder 103 is inserted into the second cylinder 104 , and the sealing ring 106 is connected to the bottom of the second cylinder 104 , thereby completing the assembly of the double anti-backdraft structure.

[0085] 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.

[0086] 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 double anti-backdraft structure for a gas water heater, characterized in that: include: A accommodating cylinder (1) is provided with a first channel (101) and a second channel (102) connected in series; A first backwind prevention mechanism (2) is provided in the first channel (101), the first backwind prevention mechanism (2) comprising a first shaft seat (201), a first rotating shaft (202) and two first backwind prevention covers (203), the two first backwind prevention covers (203) being rotatably provided on the first shaft seat (201) via the first rotating shaft (202), and the two first backwind prevention covers (203) being used to open or close the first channel (101); A second backdraft prevention mechanism (3) is provided in the second channel (102), the second backdraft prevention mechanism (3) comprising a second shaft seat (301), a second rotating shaft (302) and a second backdraft prevention cover (303), the second backdraft prevention cover (303) being rotatably provided on the second shaft seat (301) via the second rotating shaft (302), and the second backdraft prevention cover (303) being used to open or close the second channel (102).

2. The double backdraft prevention structure of the gas water heater according to claim 1, characterized in that: The first anti-backwind mechanism (2) is arranged above the second anti-backwind mechanism (3); the first channel (101) is formed between the first anti-backwind mechanism (2) and the second anti-backwind mechanism (3); and the second channel (102) is formed between the second anti-backwind mechanism (3) and the bottom end of the accommodating cylinder (1).

3. The double backdraft prevention structure of the gas water heater according to claim 2, characterized in that: The first rotating shaft (202) and the second rotating shaft (302) are perpendicular to each other.

4. The double backdraft prevention structure of the gas water heater according to claim 3, characterized in that: The first anti-backflow mechanism (2) further comprises a first sealing ring (204) and an annular base (205), wherein the first sealing ring (204) is arranged on the annular base (205) and is clamped with the annular base (205), the first shaft seat (201) is mounted on the annular base (205), and the two first anti-backflow covers (203) are arranged above the first sealing ring (204) and are used to open or cover the air inlet of the first sealing ring (204).

5. The double backdraft prevention structure of the gas water heater according to claim 4, characterized in that: The lower surface of the first sealing ring (204) abuts against the upper surface of the annular base (205); the inner ring of the annular base (205) is provided with a flange (2051) extending downward; the inner wall of the first sealing ring (204) is provided with a hook (2042) extending downward and toward the flange (2051); the hook (2042) is provided with a slot (20421) corresponding to the flange (2051); the first sealing ring (204) and the annular base (205) are connected to the flange (2051) through the slot (20421).

6. The double backdraft prevention structure of the gas water heater according to claim 4, characterized in that: The upper surface of the first sealing ring (204) is provided with a first inclined flange (2043) arranged around the edge of the air outlet, and the first inclined flange (2043) is inclined along the smoke flow direction toward the axis away from the air outlet, and the first anti-backdraft cover (203) is in contact with the first inclined flange (2043) in the closed state.

7. The double backdraft prevention structure of the gas water heater according to claim 3, characterized in that: The accommodating cylinder (1) includes a first cylinder (103) and a second cylinder (104) connected to the first cylinder (103), the first cylinder (103) is inserted into the second cylinder (104) through the mounting end (1031), an annular cavity (5) is formed between the outer wall of the first cylinder (103) close to the mounting end (1031) and the inner wall of the second cylinder (104), the second shaft seat (301) is installed in the annular cavity (5), the second anti-backwind mechanism (3) includes a second sealing ring (304), the second sealing ring (304) is sleeved on the mounting end (1031), and the second anti-backwind cover (303) is arranged above the second sealing ring (304) and is used to open or cover the air inlet of the second sealing ring (304).

8. The double backdraft prevention structure of the gas water heater according to claim 7, characterized in that: The end of the mounting end (1031) is provided with a bending portion (10311), and the bottom of the second sealing ring (304) is provided with a mounting groove (3041) corresponding to the bending portion (10311), and the first cylinder (103) and the second sealing ring (304) are clamped with the mounting groove (3041) through the bending portion (10311).

9. The double backdraft prevention structure of the gas water heater according to claim 7, characterized in that: The upper surface of the second sealing ring (304) is provided with a second inclined flange (3042) arranged around the edge of the air outlet, and the second inclined flange (3042) is inclined along the smoke flow direction toward the axis away from the air outlet, and the second anti-backdraft cover (303) is in contact with the second inclined flange (3042) in the closed state.

10. The double backdraft prevention structure of the gas water heater according to any one of claims 1 to 9, characterized in that: The distance between the first rotating shaft (202) and the second rotating shaft (302) is a, 69 mm ≤ a ≤ 75 mm; The height of the accommodating cylinder (1) is h, 163 mm ≤ h ≤ 167 mm.

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