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 preventing structure of the gas water heater comprises a containing cylinder, an annular base, a sealing ring, an annular support and a down draft preventing mechanism, the sealing ring is arranged on the supporting face of the annular base, a plurality of sealing attaching parts arranged at intervals are arranged on the upper surface of the sealing ring, and the tops of the sealing attaching parts are located on the same plane; the annular support is arranged on the sealing ring, the sealing ring is clamped between the annular support and the annular base, the down draft preventing mechanism is arranged on the annular support and used for opening or covering the air passing opening, and when the air passing opening is covered with the down draft preventing mechanism, a down draft preventing cover of the down draft preventing mechanism is attached to the multiple sealing attaching parts. According to the utility model, the upper surface of the sealing ring is provided with a plurality of spaced sealing fitting parts, and the tops of the sealing fitting parts are positioned on the same plane, so that when the air passing port is covered by the down draft prevention mechanism, the down draft prevention cover can be simultaneously fitted with the plurality of sealing fitting parts, the overall sealing effect is improved, and outdoor cold air is prevented from flowing backwards.

Description

TECHNICAL FIELD

[0001] The utility model relates to hot water supply equipment technical field especially relates to a gas water heater's prevent wind structure. BACKGROUND

[0002] The gas water heater is a kind of device using gas as energy to heat water. Gas water heater is widely used in family, commercial and industrial fields, for hot water supply.

[0003] In prior art, gas water heater smoke exhaust pipe needs to be extended outside, and anti-inversion structure is usually installed to prevent outdoor cold air from pouring. But because the sealing performance of sealing ring is poor, the overall sealing effect of anti-inversion structure is poor. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problem to provide a kind of gas water heater's prevent wind structure, it effectively solves the problem that the sealing performance of existing sealing ring is poor, by multiple interval sealing lamination parts on the upper surface of sealing ring and the top is in the same plane, when anti-inversion mechanism covers air port, anti-inversion cover can be simultaneously laminated with multiple sealing lamination parts, improve the overall sealing effect, prevent outdoor cold air from pouring.

[0005] A kind of gas water heater's prevent wind structure, comprising:

[0006] Receiving cylinder, is internally provided with the passage that penetrates up and down;

[0007] Annular base, it is located in the channel, the upper surface of the annular base has support surface;

[0008] Sealing ring, it is located on the support surface of the annular base, the upper surface of the sealing ring is equipped with multiple interval sealing lamination parts, and the top of multiple sealing lamination parts is in the same plane;

[0009] Annular support, it is located on the sealing ring and with the annular base clamping sealing ring;

[0010] Anti-inversion mechanism, it is located on the annular support, the annular base, the sealing ring and the annular support all have air port, the anti-inversion mechanism is used to open or cover the air port, when the anti-inversion mechanism covers the air port, the anti-inversion cover of the anti-inversion mechanism is laminated with multiple sealing lamination parts.

[0011] The anti-wind structure of the gas water heater has the beneficial effects that the anti-wind structure is installed in the gas water heater, the accommodating cylinder is communicated with the smoke exhaust pipe of the gas water heater, smoke in the gas water heater can be exhausted through the anti-wind mechanism. When the gas water heater is in the running state, the fan of the gas water heater is started, the anti-wind cover of the anti-wind mechanism is blown open by the wind force, the anti-wind mechanism opens the air passage, the channel of the accommodating cylinder is opened, and the smoke is smoothly exhausted. When the gas water heater is in the state of stopping running, the anti-wind cover of the anti-wind mechanism seals the air passage, the anti-wind cover of the anti-wind mechanism is in contact with the multiple sealing abutting portions of the sealing ring, the channel of the accommodating cylinder is closed, and the reverse flow of the outdoor cold air through the channel of the accommodating cylinder to the deep part of the water heater smoke passage is avoided, so that the internal elements are not affected. Since the multiple sealing abutting portions are arranged at intervals and the top portions of the multiple sealing abutting portions are in the same plane, when the anti-wind cover seals the air passage and is in contact with the multiple sealing abutting portions, the sealing contact points and the effective abutting area of the anti-wind cover and the sealing ring are increased, the overall sealing effect is improved, and the reverse flow of the outdoor cold air is prevented.

[0012] Since the multiple sealing abutting portions are arranged at intervals and the top portions of the multiple sealing abutting portions are in the same plane, when the anti-wind mechanism seals the air passage, the anti-wind cover can be in contact with the multiple sealing abutting portions at the same time. Compared with the traditional single sealing surface or sealing structure, the sealing contact points and the effective abutting area of the anti-wind cover and the sealing ring are increased, the overall sealing effect is improved, and the reverse flow of the outdoor cold air is prevented.

[0013] In addition, since the channel of the accommodating cylinder is provided with the annular base, the sealing ring and the annular support, the sealing ring is clamped between the annular support and the annular base through cooperation of the annular base, the sealing ring and the annular support, the flatness of the lower surface and the upper surface of the sealing ring is limited by the annular base and the annular support respectively, the flatness of the sealing ring as a whole is ensured, and the sealing performance of the anti-wind structure is improved.

[0014] In one of the embodiments, the sealing abutting portion is arranged on the upper surface of the sealing ring and surrounds the edge of the air passage, the sealing abutting portion is an inclined flange, the inclined flange is arranged to be inclined away from or close to the axis of the air passage along the smoke flow direction, the inclined flange protrudes from the upper surface of the annular support, and the anti-wind cover is in abutment with the inclined flange in the sealing state.

[0015] In one of the embodiments, two soft and elastic sealing abutting portions are arranged on the sealing ring, and the two sealing abutting portions each have a fixed end and a free end, the fixed end is fixedly connected with the sealing ring, and the free end is located above the sealing ring.

[0016] In one of the embodiments, the sealing fitting part close to the air passage is inclined upward along the axis direction of the air passage, and the sealing fitting part away from the air passage is inclined upward along the axis direction of the air passage.

[0017] In one of the embodiments, the two sealing fitting parts are symmetrically arranged about the center plane of the two sealing fitting parts.

[0018] In one of the embodiments, the middle region of the sealing ring is provided with a mounting part, the air passage is divided into two air passages by the mounting part, the sealing fitting part is provided with two groups, each group of the sealing fitting part is provided with two sealing fitting parts, and the two groups of the sealing fitting parts are arranged around the edges of the two air passages, respectively.

[0019] In one of the embodiments, the anti-backflow mechanism comprises a rotating shaft and two anti-backflow covers, the two anti-backflow covers are arranged on the annular support by rotating the rotating shaft, and the two anti-backflow covers are used for opening or covering the two air passages, respectively.

[0020] In one of the embodiments, the annular support comprises an annular clamping part and an annular limiting part arranged downward around the outer circle of the annular clamping part, the inner wall of the annular clamping part abuts against the upper surface of the sealing ring, and the inner wall of the annular limiting part cooperates with the outer wall of the sealing ring and is sleeved on the outer wall of the annular base.

[0021] In one of the embodiments, the inner wall of the annular base is provided with a first flange arranged upward, and the inner wall of the sealing ring abuts against the outer wall of the first flange.

[0022] In one of the embodiments, the middle region of the annular base is provided with a cross beam, the cross beam divides the air passage into two air passages, the first flange is provided with two groups, and the two groups of the first flange are arranged around the inner walls of the two air passages, respectively. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0024] Figure 1 It is an explosion schematic view of the anti-backflow structure of the gas water heater of the utility model embodiment;

[0025] Figure 2 for Figure 1 A schematic diagram of the structure of the annular base, sealing ring, and annular support;

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

[0027] Figure 4 for Figure 3 A sectional view;

[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 for Figure 3 A cross-sectional view from another perspective;

[0031] Figure 8 for Figure 3 A cross-sectional view from another perspective;

[0032] Figure 9 for Figure 3 A cross-sectional view 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. Support surface; 202. First flange; 203. Crossbeam; 3. Sealing ring; 301. Sealing fitting part; 302. Air outlet; 303. Mounting part; 4. Annular bracket; 401. Annular clamping part; 402. Annular limiting part; 5. Anti-backdraft mechanism; 501. Anti-backdraft cover; 502. Rotating shaft; 6. 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 skilled 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, gas water heater exhaust pipes, which need to extend outdoors, are often equipped with anti-backdraft structures to prevent cold outdoor air from flowing back in. However, due to the poor sealing performance of their sealing rings, the overall sealing effect of the anti-backdraft structure is poor.

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

[0041] According to embodiments of the present invention, on the one hand, such as Figures 1 to 9 As 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, an annular bracket 4, and a backdraft prevention mechanism 5.

[0042] Specifically, such as Figure 1 As shown, the container 1 has a channel inside, which runs through the upper and lower ends of the container 1.

[0043] Specifically, such as Figure 1 , Figure 2 and Figure 5 As shown, the annular base 2 is installed in the channel, wherein the upper surface of the annular base 2 has a support surface 201.

[0044] Specifically, such asFigure 1 , Figure 2 and Figure 5 As shown, the sealing ring 3 is disposed on the support surface 201 of the annular base 2. The upper surface of the sealing ring 3 has a plurality of sealing and fitting portions 301, wherein the plurality of sealing and fitting portions 301 are spaced apart, and the tops of the plurality of sealing and fitting portions 301 are on the same plane.

[0045] Specifically, such as Figure 1 , Figure 2 and Figure 5 As shown, the annular bracket 4 is mounted on the sealing ring 3, and the sealing ring 3 is sandwiched between the annular bracket 4 and the annular base 2.

[0046] Specifically, such as Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the anti-backdraft mechanism 5 is mounted on the annular bracket 4. The annular base 2, the sealing ring 3, and the annular bracket 4 all have air vents 302, and the anti-backdraft mechanism 5 is used to open or close the air vents 302. When the anti-backdraft mechanism 5 closes the air vents 302, the anti-backdraft cover 501 of the anti-backdraft mechanism 5 abuts against multiple sealing parts 301.

[0047] 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 5. When the water heater is running, the fan starts, blowing open the anti-backdraft cover 501 of the anti-backdraft mechanism 5, 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 501 seals the vent 302, and the cover fits snugly against the multiple sealing parts 301 of the sealing ring 3, closing the containment cylinder 1 and preventing backdraft from flowing into the deeper flue gas passage of the water heater and affecting internal components. Since the multiple sealing and bonding parts 301 are spaced apart and the tops of the multiple sealing and bonding parts 301 are on the same plane, when the anti-backdraft cover 501 covers the air outlet 302 and contacts the multiple sealing and bonding parts 301, it increases the sealing contact points and effective bonding area of ​​the anti-backdraft cover 501 and the sealing ring 3, improves the overall sealing effect, and prevents outdoor cold air from flowing back in.

[0048] Since the upper surface of the sealing ring 3 is provided with multiple spaced sealing fitting parts 301 and the top is in the same plane, when the air outlet 302 is covered by the anti-draught cover 501, the anti-draught cover 501 can be fitted with multiple sealing fitting parts 301 at the same time. Compared with the traditional single sealing surface or sealing structure, the sealing contact points and effective fitting area of the anti-draught cover 501 and the sealing ring 3 are increased, and the overall sealing effect is improved to prevent outdoor cold air from flowing back.

[0049] In addition, since the annular seat 2, the sealing ring 3 and the annular support 4 are arranged in the passage of the accommodating cylinder 1, the sealing ring 3 is clamped between the annular support 4 and the annular seat 2 through the cooperation of the annular seat 2, the sealing ring 3 and the annular support 4, the flatness of the upper surface and the lower surface of the sealing ring 3 is limited by the annular seat 2 and the annular support 4 respectively, and the flatness of the sealing ring 3 is ensured, so that the sealing performance of the anti-draught structure is improved.

[0050] Specifically, the sealing fitting part 301 can be vertically arranged or obliquely arranged. Similarly, multiple spaced sealing fitting parts 301, at least part of the sealing fitting parts 301 can be vertically arranged, and another part of the sealing fitting parts 301 can be obliquely arranged. Alternatively, multiple sealing fitting parts 301 can be vertically arranged or obliquely arranged. In the embodiments of the present application, the structure of the sealing fitting part 301 is not specifically limited.

[0051] Specifically, two sealing fitting parts 301, three sealing fitting parts 301 or four sealing fitting parts 301 can be arranged on the sealing ring 3, and the number of the sealing fitting parts 301 is not specifically limited in the embodiments of the present application.

[0052] Specifically, multiple sealing fitting parts 301 can be uniformly spaced or non-uniformly spaced, and the distribution of multiple sealing fitting parts 301 is not specifically limited in the embodiments of the present application. Multiple sealing fitting parts 301 can be two, three or more than four, and the specific number can be adaptively set according to actual needs.

[0053] Specifically, the anti-draught mechanism 5 can select any existing anti-draught device. For example, the anti-draught mechanism 5 can be provided with one anti-draught cover 501 or two anti-draught covers 501, and the structure of the anti-draught mechanism 5 is not specifically limited in the embodiments of the present application.

[0054] As shown in Figure 1 , Figure 3 and Figure 4 , the accommodating cylinder 1 includes a first smoke exhaust pipe 101 and a second smoke exhaust pipe 102, and the anti-draught mechanism 5 can be installed at the connection between the first smoke exhaust pipe 101 and the second smoke exhaust pipe 102.

[0055] Specifically, the annular base 2, the sealing ring 3, the annular support 4 and the anti-backdraft mechanism 5 can be arranged at any position of the passage, and in the embodiment of the present application, the arrangement positions of the annular base 2, the sealing ring 3, the annular support 4 and the anti-backdraft mechanism 5 are not specifically limited.

[0056] Specifically, the support surface 201 of the annular base 2 is used to support the lower surface of the sealing ring 3, and the shape of the support surface 201 can be matched with the lower surface of the sealing ring 3, and in the embodiment of the present application, the shape of the support surface 201 is not specifically limited.

[0057] In one embodiment, as shown in Figure 2 , Figure 4 and Figure 5 , the sealing fitting part 301 is arranged on the upper surface of the sealing ring 3, and the sealing fitting part 301 is arranged around the edge of the air passage 302 of the sealing ring 3. The sealing fitting part 301 is an inclined flange, which is arranged to be inclined away from or close to the axis of the air passage 302 along the direction of the flue gas flow. The inclined flange protrudes from the upper surface of the annular support 4, and in the capped state, the anti-backdraft cover 501 abuts against the inclined flange.

[0058] The anti-backdraft cover 501 abuts against the inclined flange in the capped state, on the one hand, the anti-backdraft cover 501 itself can block the external air from entering; on the other hand, the close contact between the inclined flange and the anti-backdraft cover 501 further enhances the sealing effect, effectively preventing the backflow of cold air and the leakage of flue gas. At the same time, since the inclined flange is arranged to be inclined away from or close to the axis of the air passage 302 along the direction of the flue gas flow, the inclined flange can automatically adjust the fitting degree with the anti-backdraft cover 501 under different pressures, always maintaining a good sealing state, and ensuring that the abnormal flow of air and flue gas can be effectively prevented under various working conditions.

[0059] Since the inclined flange protrudes from the upper surface of the annular support 4, during the capping process of the anti-backdraft cover 501, it is ensured that the inclined flange first contacts the anti-backdraft cover 501, avoiding the direct contact between the anti-backdraft cover 501 and the annular support 4.

[0060] Specifically, the plurality of sealing fitting parts 301 can be inclined away from the axis direction of the air passage 302; or the plurality of sealing fitting parts 301 can be inclined close to the axis direction of the air passage 302; or the plurality of sealing fitting parts 301 can be partially inclined close to the axis direction of the air passage 302 and the other part is inclined away from the axis direction of the air passage 302, and in the embodiment of the present application, the inclination direction of the plurality of sealing fitting parts 301 is not specifically limited.

[0061] In one embodiment, as shown in Figure 5As shown, the sealing ring 3 is provided with two soft sealing fit portions 301, and each of the two sealing fit portions 301 has a fixed end and a free end. The fixed end is fixedly connected to the sealing ring 3, and the free end is located above the sealing ring 3.

[0062] According to the above embodiment, when the anti-back-draft cover 501 contacts the two soft and elastic sealing fit portions 301, the sealing fit portions 301 have free ends, so that the sealing fit area between the sealing ring and the anti-back-draft cover 501 can be increased by adaptive deformation of the free ends, the sealing property of the anti-back-draft structure is improved, and the probability of back-draft entering the water heater is reduced.

[0063] In one embodiment, as shown in Figure 5 , the sealing fit portion 301 close to the air passage 302 of the sealing ring 3 extends upwardly along the flue gas flow direction towards the axis close to the air passage 302, and the sealing fit portion 301 away from the air passage 302 extends upwardly along the flue gas flow direction towards the axis away from the air passage 302, that is, the two sealing fit portions 301 extend upwardly from different directions, so that when the anti-back-draft cover 501 contacts the two sealing fit portions 301, the two sealing fit portions 301 adaptively tilt and deform towards different directions without being interfered by different sealing fit portions, thereby further increasing the sealing fit area. When the anti-back-draft cover 501 opens the air passage 302, the two sealing fit portions 301 restore deformation due to their elasticity.

[0064] Specifically, as shown in Figure 5 , the two sealing fit portions 301 can be arranged in a "V" shape.

[0065] In one embodiment, as shown in Figure 5 , the two sealing fit portions 301 are symmetrically arranged about the center of the two sealing fit portions 301.

[0066] When the anti-back-draft cover 501 is capped, the symmetrical arrangement enables the pressure applied by the anti-back-draft cover 501 to the two sealing fit portions 301 to be uniformly distributed. The pressure borne by each sealing fit portion 301 is relatively balanced, avoiding the problem of local sealing failure caused by uneven stress, thereby forming a stable and consistent sealing effect around the entire air passage 302, improving the reliability and durability of the sealing, and more effectively preventing cold air from back-drafting.

[0067] During manufacturing, the two sealing fit portions 301 arranged symmetrically facilitate mold design and processing, improve production efficiency, reduce manufacturing cost, and also make it easier to ensure the consistency of product quality.

[0068] In one embodiment, as shown in Figure 2 , Figure 5 , and Figure 6As shown, the middle region of the sealing ring 3 is provided with a mounting portion 303, which divides one air passage 302 of the sealing ring 3 into two air passages 302. The sealing and fitting portion 301 is provided with two groups, each group of the sealing and fitting portion 301 is provided with two sealing and fitting portions 301, and the two groups of the sealing and fitting portion 301 are respectively arranged around the edges of the two air passages 302.

[0069] The mounting portion 303 of the middle region of the sealing ring 3 divides the air passage 302 into two, which increases the structural strength of the sealing ring 3. At the same time, two groups of the sealing and fitting portion 301 are arranged around the edges of the two air passages 302, so that an independent sealing defense line is formed around each air passage 302. Even if the sealing at one air passage 302 leaks slightly, the sealing of the other air passage 302 can still effectively prevent the backflow of cold air.

[0070] In one embodiment, as shown in Figure 1 and Figure 8 The anti-backwind mechanism 5 includes a rotating shaft 502 and two anti-backwind covers 501, wherein the two anti-backwind covers 501 are rotatably arranged on the annular support 4 through the rotating shaft 502, and the two anti-backwind covers 501 are respectively used to open or cover the two air passages 302.

[0071] Rotatably arranging the two anti-backwind covers 501 on the rotating shaft 502 can provide sealing and anti-backwind protection, form a tighter sealing effect, and more effectively prevent the invasion of cold air or other pollutants. When the anti-backwind mechanism 5 is in the covering state, the two anti-backwind covers 501 cover the air passages 302, ensuring that the anti-backwind cover 501 can provide a tighter sealing effect. When the anti-backwind mechanism 5 is in the open state, the two anti-backwind covers 501 open the air passages 302, ensuring that the accommodation cylinder 1 can smoothly exhaust smoke.

[0072] Specifically, when the two anti-backwind covers 501 are arranged horizontally, the plane formed by the two anti-backwind covers 501 is adapted to the cross section of the inside of the first smoke exhaust pipe 101 or the second smoke exhaust pipe 102, and then the first smoke exhaust pipe 101 or the second smoke exhaust pipe 102 is blocked by the horizontally arranged two anti-backwind covers 501. For example, when the first smoke exhaust pipe 101 and the second smoke exhaust pipe 102 are circular pipes, the anti-backwind cover 501 can be arranged in a circular shape, and the diameter of the anti-backwind cover 501 is the same as the inner diameter of the first smoke exhaust pipe 101 and the second smoke exhaust pipe 102.

[0073] In one embodiment, as shown in Figure 2 and Figure 5As shown, the annular support 4 comprises an annular clamping portion 401 and an annular limiting portion 402, the annular limiting portion 402 is arranged around the outer circle of the annular clamping portion 401, and the annular limiting portion 402 extends downward. Among them, the inner wall of the annular clamping portion 401 abuts against the upper surface of the sealing ring 3, the inner wall of the annular limiting portion 402 cooperates with the outer wall of the sealing ring 3, and the annular limiting portion 402 is sleeved on the outer wall of the annular base 2.

[0074] When installing the sealing ring 3, the inner wall of the annular clamping portion 401 of the annular support 4 abuts against the upper surface of the sealing ring 3, and the inner wall of the annular limiting portion 402 cooperates with the outer wall of the sealing ring 3, which limits the sealing ring 3 from multiple directions, ensures the accurate positioning of the sealing ring 3 during installation, and ensures that the sealing ring 3 maintains a stable position during operation. By clamping the sealing ring 3 by the annular clamping portion 401 and the annular limiting portion 402, the stability of the sealing ring 3 is ensured, and the flatness of the sealing ring 3 is also maintained, avoiding displacement or deformation, thereby better ensuring the sealing effect and reducing the possibility of outdoor cold air backflow.

[0075] In addition, the annular limiting portion 402 is sleeved on the outer wall of the annular base 2, so that the annular support 4 and the annular base 2 form a close nesting structure, enhancing the integrity of the entire anti-backflow structure, and the cooperation between the components is more closely and stably.

[0076] Specifically, since the annular limiting portion 402 of the annular support 4 is sleeved on the outer wall of the annular base 2, during the installation of the annular support 4, the sealing ring 3 and the annular base 2, the annular limiting portion 402 of the annular support 4 can be connected with the inner wall of the containing cylinder 1, so that the annular support 4, the sealing ring 3 and the annular base 2 are fixed inside the containing cylinder 1.

[0077] In one embodiment, as shown in Figure 2 and Figure 5 As shown, the inner wall of the annular base 2 is provided with a first flange 202, and the first flange 202 extends upward, and the inner wall of the sealing ring 3 abuts against the outer wall of the first flange 202.

[0078] By abutting the first flange 202 of the annular base 2 against the inner wall of the sealing ring 3, the stability of the sealing ring 3 fixed on the annular base 2 is ensured, avoiding displacement or deformation of the sealing ring 3, thereby further ensuring the sealing performance of the sealing ring 3, reducing the possibility of outdoor cold air backflow, and reducing the risk of freezing of the gas water heater.

[0079] Specifically, the height of the first flange 202 should be less than the thickness of the sealing ring 3, ensuring that when the anti-draft cover 501 is capped on the sealing ring 3, the anti-draft cover 501 is directly in contact with the sealing ring 3, guaranteeing the sealing performance of the anti-draft structure. If the height of the first flange 202 is greater than the thickness of the sealing ring 3, the first flange 202 will protrude above the upper surface of the sealing ring 3, and when the anti-draft cover 501 is in the capped state, the anti-draft cover 501 directly cooperates with the first flange 202, resulting in a decline in the sealing performance of the anti-draft structure.

[0080] In one embodiment, as shown in Figure 2 and Figure 6 , the middle region of the annular base 2 is provided with a crossbeam 203, which divides the air passage 302 into two. The first flange 202 is provided in two groups, and the two groups of first flanges 202 are respectively arranged around the inner walls of the two air passages 302.

[0081] The crossbeam 203 in the middle region of the annular base 2 divides the air passage 302 into two, increasing the structural strength of the annular base 2. The first flange 202 is provided in two groups, and the two groups of first flanges 202 are respectively arranged around the inner walls of the two air passages 302, so that the first flange 202 is in full contact with the inner wall of the sealing ring 3, increasing the area and contact points of the first flange 202 in contact with the sealing ring 3, further ensuring the fixing stability and flatness of the sealing ring 3.

[0082] Specifically, as shown in Figure 4 , it also includes a chimney rubber ring 6, which can be embedded on the inner wall of the containing cylinder 1.

[0083] The assembly process of the anti-draft structure of the gas water heater in this embodiment is described as follows:

[0084] First, the lower surface of the sealing ring 3 is installed on the support surface 201 of the annular base 2, and the first flange 202 on the annular base 2 is in abutment with the inner wall of the sealing ring 3.

[0085] Then, the annular bracket 4 is arranged on the sealing ring 3, so that the inner wall of the annular clamping portion 401 is in abutment with the upper surface of the sealing ring 3, and the inner wall of the annular limiting portion 402 cooperates with the outer wall of the sealing ring 3 and is sleeved on the outer wall of the annular base 2, completing the assembly of the annular base 2, the sealing ring 3 and the annular bracket 4.

[0086] Then, the two anti-draft covers 501 are arranged on the shaft seat by rotating the shaft 502, completing the assembly of the anti-draft mechanism 5 and the annular bracket 4.

[0087] Finally, the annular support 4 is connected with the containing cylinder 1 by abutting the outer wall of the annular limiting part 402 with the inner wall of the containing cylinder 1, in order to ensure the fixing firmness between the annular support 4 and the containing cylinder 1, welding can be carried out at the connection, and the assembly of the windproof structure is completed.

[0088] In the specific contents of the foregoing specific embodiments, each technical feature can be combined arbitrarily without contradiction, and in order to make the description simple, all possible combinations of the foregoing technical features are not described, however, as long as the combination of the technical features does not exist contradiction, it should be considered that it is within the scope of the description.

[0089] The specific contents of the foregoing specific embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the utility model. It should be pointed out that for ordinary skilled persons in the art, on the premise of not departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A wind back prevention structure of a gas water heater, characterized by, The utility model relates to a smoke exhaust device, including: The accommodating cylinder (1) is internally provided with the channel that penetrates up and down; Annular base (2) is located in the channel, the upper surface of annular base (2) has support surface (201); Sealing ring (3) is located on the support surface (201) of annular base (2), the upper surface of sealing ring (3) is equipped with multiple interval arrangement sealing lamination (301), the top of multiple sealing lamination (301) is in the same plane; Annular support (4) is located on sealing ring (3) and with annular base (2) sandwich sealing ring (3); Anti wind mechanism (5) is located on annular support (4), annular base (2), sealing ring (3) and annular support (4) all have air passage (302), anti wind mechanism (5) is used to open or cover air passage (302), when anti wind mechanism (5) covers air passage (302), the anti wind cover (501) of anti wind mechanism (5) is attached with multiple sealing lamination (301).

2. The anti-downdraught structure of a gas water heater according to claim 1, characterized in that: The sealing lamination (301) is arranged on the upper surface of the sealing ring (3) and around the edge of the air passage (302), the sealing lamination (301) is an inclined flange, the inclined flange is inclined to the axis away from or close to the air passage (302) along the smoke flow direction, and the inclined flange protrudes from the upper surface of the annular support (4), the anti wind cover (501) is in contact with the inclined flange in the cover state.

3. The anti-downdraught structure of a gas water heater according to claim 2, characterized in that: Two soft and elastic sealing lamination (301) are arranged on the sealing ring (3), both sealing lamination (301) have a fixed end and a free end, the fixed end is fixedly connected with the sealing ring (3), and the free end is located above the sealing ring (3).

4. The anti-downdraught structure of a gas water heater according to claim 3, characterized in that: The sealing lamination (301) close to the air passage (302) extends upward along the smoke flow direction towards the axis close to the air passage (302), and the sealing lamination (301) away from the air passage (302) extends upward along the smoke flow direction towards the axis away from the air passage (302).

5. The anti-downdraught structure of a gas water heater according to claim 4, characterized in that: The two sealing lamination (301) are symmetrically arranged about the center of the two sealing lamination (301).

6. The anti-downdraught structure of a gas water heater according to claim 5, characterized in that: The middle region of the sealing ring (3) is provided with a mounting portion (303), the mounting portion (303) divides the air passage (302) into two air passages (302), the sealing lamination (301) is provided with two groups, each group of sealing lamination (301) is provided with two sealing lamination (301), and two groups of sealing lamination (301) are arranged around the edges of the two air passages (302) respectively.

7. The anti-downdraught structure of a gas water heater according to any one of claims 1 to 6, characterized in that: The anti wind mechanism (5) includes a rotating shaft (502) and two anti wind covers (501), the two anti wind covers (501) are rotatably arranged on the annular support (4) through the rotating shaft (502), and the two anti wind covers (501) are used for opening or covering the two air passages (302) respectively.

8. The anti-downdraught structure of a gas water heater according to any one of claims 1 to 6, characterized in that: The annular support (4) comprises an annular clamping portion (401) and an annular limiting portion (402) extending downward around the outer circle of the annular clamping portion (401), the inner wall of the annular clamping portion (401) abuts against the upper surface of the sealing ring (3), and the inner wall of the annular limiting portion (402) cooperates with the outer wall of the sealing ring (3) and is sleeved on the outer wall of the annular base (2).

9. The anti-downdraught structure of a gas water heater according to any one of claims 1 to 6, characterized in that: The inner wall of the annular base (2) is provided with a first flange (202) extending upward, and the inner wall of the sealing ring (3) abuts against the outer wall of the first flange (202).

10. The anti-downdraught structure of a gas water heater according to claim 9, characterized in that: The middle region of the annular base (2) is provided with a cross beam (203), the cross beam (203) divides the air passage (302) into two air passages (302), and the first flange (202) is provided in two groups, and the two groups of first flanges (202) are respectively arranged around the inner walls of the two air passages (302).

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