Downdraft prevention structure and gas water heater

Abstract

The utility model relates to the technical field of hot water supply equipment, and discloses an anti-downdraft structure and a gas water heater. The down draft prevention structure comprises a containing cylinder, a smoke exhaust channel and a smoke exhaust pipe, the annular base is arranged in the smoke exhaust channel and is matched with the smoke exhaust channel; the sealing ring is arranged on the upper surface of the annular base, and the upper surface of the sealing ring is provided with a sealing attaching part; the annular support is arranged on the sealing ring, and the sealing ring is clamped between the annular support and the annular base; a first flange is arranged on the peripheral side of the upper surface in the annular bracket; the down draft prevention mechanism comprises a rotating shaft and a down draft prevention cover, and the down draft prevention cover is rotationally connected with the first flange through the rotating shaft; the annular support, the sealing ring and the annular base are each provided with a smoke passing opening, the down draft preventing cover is used for opening or covering the smoke passing opening, and when the down draft preventing cover covers the smoke passing opening, the down draft preventing cover is attached to the sealing attaching part. On the premise that the cost is not increased, the structural strength of the annular support and the sealing performance of the down draft prevention structure are improved.

Description

TECHNICAL FIELD

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

[0002] In order to guarantee the use safety of user, the smoke exhaust pipe of gas water heater needs to extend outdoor. Considering that the outdoor cold air can be poured to the inside of gas water heater through the smoke exhaust pipe, generally, the anti-inversion structure is added in the smoke exhaust pipe. To ensure that the sealing performance of anti-inversion structure is good, generally, the sealing ring is installed at the sticking place of anti-inversion cover. However, in the transportation of sealing ring and the processing of anti-inversion structure, the sealing ring is extruded, which leads to the decrease of the flatness of sealing ring, thereby reducing the sealing performance of anti-inversion structure and increasing the freezing risk of gas water heater.

[0003] Based on the above reasons, some existing anti-inversion structures set sealing pressing plate above the sealing ring to improve the flatness of the whole sealing ring and improve the sealing performance of anti-inversion structure. However, the conventional sealing ring pressing plate is downwardly turned over and buckled with the sealing ring, and then the turned-over edge is cut and bent upward to form the bracket of wind baffle pivot. However, this will damage the consistency of the turned-over edge structure of sealing ring pressing plate, which leads to the decrease of the structural strength of sealing ring pressing plate and the deformation of sealing ring pressing plate in the process of assembly or use, thereby reducing the sealing performance of anti-inversion structure. UTILITY MODEL CONTENTS

[0004] The first technical problem solved by the utility model is to provide an anti-inversion structure, which can improve the structural strength of annular bracket and the sealing performance of anti-inversion structure without increasing the cost.

[0005] The second technical problem solved by the utility model is to provide a gas water heater, which can improve the structural strength of annular bracket and the sealing performance of anti-inversion structure without increasing the cost.

[0006] The first technical problem is solved by the following technical scheme:

[0007] An anti-inversion structure for a gas water heater, comprising:

[0008] A containing cylinder having an upper and lower smoke exhaust passage;

[0009] An annular base disposed in the smoke exhaust passage and adapted to the smoke exhaust passage, the upper surface of the annular base having a support surface;

[0010] A sealing ring disposed on the support surface, the upper surface of the sealing ring having a sealing sticking part;

[0011] An annular support is arranged on the sealing ring and clamps the sealing ring with the annular base; a first flange is arranged on the periphery of the upper surface of the annular support; a pair of through holes are arranged on the first flange.

[0012] The anti-wind-back mechanism comprises a rotating shaft and an anti-wind-back cover, the anti-wind-back cover is arranged in the through hole and is rotationally connected with the first flange through the rotating shaft; the annular support, the sealing ring and the annular base all have a smoke passing opening, the anti-wind-back cover is used for opening or covering the smoke passing opening, and the anti-wind-back cover is in contact with the sealing abutting portion when covering the smoke passing opening.

[0013] Compared with the prior art, the anti-wind-back structure has the beneficial effects that: compared with arranging a flange structure on the lower surface of the annular support, the first flange is arranged on the periphery of the upper surface of the annular support, so that an operator can directly arrange a through hole on the first flange for rotationally cooperating with the rotating shaft. In this way, the first flange can be prevented from being additionally cut and bent, the structural integrity of the first flange is ensured, and the structural strength of the annular support is improved. In this way, the annular support can stably maintain its own shape in the subsequent assembly process or use process, so that the annular support can uniformly apply pressure to the sealing ring, the flatness of the sealing ring and the sealing performance of the anti-wind-back structure are ensured, and the risk of freezing of the gas water heater is reduced. In addition, since the first flange does not need to be additionally cut and bent during the production of the annular support of the utility model, the production process of the annular support can be simplified, and the production and manufacturing cost of the annular support can be reduced.

[0014] In one of the embodiments, the sealing abutting portion is arranged around the edge of the smoke passing opening of the sealing ring, the sealing abutting portion extends to the upper surface of the annular support through the smoke passing opening of the annular support and is adapted to be in contact with the anti-wind-back cover; the lower surface of the annular support is provided with an annular flange, the annular flange surrounds the sealing abutting portion and is in contact with the upper surface of the sealing ring.

[0015] In one of the embodiments, 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 smoke passing opening, and the inclined flange protrudes from the upper surface of the annular support, and the anti-wind-back cover is in contact with the inclined flange in the covering state.

[0016] In one of the embodiments, the upper surface of the sealing ring is further provided with an annular groove around the sealing abutting portion, and the annular support is inserted into the annular groove through the annular flange to cooperate with the sealing ring.

[0017] In one of the embodiments, the first flange is further provided with at least one limiting portion, which is inclined along a direction away from the annular support and close to the axis of the annular support, and is used to limit the maximum opening angle of the anti-draft cover.

[0018] In one of the embodiments, the smoke passing openings of the sealing ring are a pair, which are symmetrically arranged with respect to the center line of the sealing ring; the smoke passing openings of the annular base and the annular support are also a pair and are arranged one by one corresponding to the smoke passing openings of the sealing ring.

[0019] In one of the embodiments, the anti-draft covers are a pair, which are arranged one by one corresponding to the smoke passing openings of the annular support, and are arranged on the annular support through the rotating shaft; the two anti-draft covers are respectively used to open or cover the two smoke passing openings.

[0020] In one of the embodiments, the upper surface of the annular base is provided with a second flange around the edge of the smoke passing opening of the annular base, and the height of the second flange is lower than that of the sealing portion; the upper surface of the annular base is provided with a third flange around the side, and the support surface is located between the second flange and the third flange.

[0021] In one of the embodiments, the first flange is provided with a positioning groove formed by concave at the position of the through hole, and the through hole is arranged on the groove bottom of the positioning groove; the third flange is arranged around the outside of the first flange, and the third flange is provided with a positioning protrusion matched with the positioning groove.

[0022] The second technical problem is solved by the following technical scheme:

[0023] A gas water heater, comprising: a smoke exhaust pipe and the above-mentioned anti-draft structure, the anti-draft structure is detachably arranged in the smoke exhaust pipe.

[0024] Compared with the prior art, the gas water heater of this utility model has the following advantages: The gas water heater equipped with the aforementioned anti-backdraft structure has better sealing performance in its exhaust pipe compared to existing gas water heaters, effectively reducing the risk of outdoor cold air backflowing into the gas water heater and causing it to freeze. Specifically, since the first flange is located on the upper circumference of the annular bracket, a through hole that mates with the rotating shaft can be directly set on the first flange without additional cutting or bending operations. This reduces the size of the notch on the first flange, ensuring the structural integrity of the annular bracket and reducing the possibility of deformation under external force. Therefore, the annular bracket can apply pressure evenly to the sealing ring during use, improving the flatness of the sealing ring and enhancing the sealing performance of the anti-backdraft structure. Furthermore, since no additional cutting or bending operations are required on the first flange during the production of the annular bracket, the production process of the gas water heater of this utility model can be simplified, and its production cost can be reduced accordingly. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is an exploded view of an anti-backdraft structure according to an embodiment of the present invention;

[0027] Figure 2 for Figure 1 The diagram shows the structure of the accommodating cylinder;

[0028] Figure 3 for Figure 1 The diagram shows the structure of the ring-shaped support.

[0029] Figure 4 This is a cross-sectional view of an anti-backdraft structure according to an embodiment of the present utility model;

[0030] Figure 5 for Figure 4 A magnified view of part M;

[0031] Figure 6 for Figure 4 A magnified view of N in the middle;

[0032] Figure 7 for Figure 4 A schematic diagram of the structure from the perspective of AA;

[0033] Figure 8 For Figure 7 Close-up view of the middle H.

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] 1, accommodating cylinder; 101, smoke exhaust passage; 102, first smoke exhaust pipe; 103, second smoke exhaust pipe; 2, annular base; 201, support surface; 202, second flange; 203, third flange; 2031, positioning protrusion; 3, sealing ring; 301, sealing fitting part; 302, annular groove; 4, annular support; 401, first flange; 4011, through hole; 4012, positioning groove; 402, annular flange; 403, limiting part; 5, anti-inversion mechanism; 501, rotating shaft; 502, anti-inversion cover; 6, smoke passage. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0037] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0038] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0039] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected, can be mechanically connected, or electrically connected, can be directly connected, or indirectly connected through an intermediate medium, or can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] The embodiments of the present application will be described below in conjunction with Figures 1 to 8 The embodiments of the present application will be described below in conjunction with

[0041] According to the embodiments of the present application, on the one hand, as shown in Figure 1 and Figure 3 A windproof structure is provided for a gas water heater, comprising: a containing cylinder 1, an annular base 2, a sealing ring 3, an annular support 4, and a windproof mechanism 5.

[0042] Specifically, the inside of the containing cylinder 1 is provided with a smoke exhaust passage 101 which penetrates up and down; the annular base 2 is arranged in the smoke exhaust passage 101 and is adapted to the smoke exhaust passage 101, and the upper surface of the annular base 2 has a support surface 201; the sealing ring 3 is arranged on the support surface 201, and the upper surface of the sealing ring 3 has a sealing fitting portion 301; the annular support 4 is arranged on the sealing ring 3 and clamps the sealing ring 3 between the annular base 2 and the annular support 4; the upper surface of the annular support 4 is provided with a first flange 401 on the circumferential side, and the first flange 401 is provided with a pair of opposite through holes 4011; the windproof mechanism 5 comprises a rotating shaft 501 and a windproof cover 502, the windproof cover 502 is arranged in the through hole 4011 and is rotatably connected with the first flange 401 through the rotating shaft 501; the annular support 4, the sealing ring 3 and the annular base 2 all have a smoke passage 6, the windproof cover 502 is used to open or cover the smoke passage 6, and when the windproof cover 502 covers the smoke passage 6, the windproof cover 502 is fitted with the sealing fitting portion 301.

[0043] Compared with the flip structure arranged on the lower surface of the annular support 4, the first flip 401 is arranged on the upper surface of the annular support 4 in the embodiment, so that the operator can directly arrange the through hole 4011 matched with the rotating shaft 501 on the first flip 401. In this way, the additional cutting and bending operations on the first flip 401 can be avoided, the structural integrity of the first flip 401 is ensured, and the structural strength of the annular support 4 is improved. In this way, the annular support 4 can stably maintain its own shape during the subsequent assembly process or use process, so as to uniformly apply pressure to the sealing ring 3, ensure the flatness of the sealing ring 3 and the sealing performance of the anti-backdraft structure, and reduce the risk of freezing the machine of the gas water heater. In addition, since the additional cutting and bending operations on the first flip 401 are not required during the production of the annular support 4 of the embodiment, the production process of the annular support 4 can be simplified, and the production cost of the annular support 4 is reduced.

[0044] In one embodiment, as shown in Figure 2 , the accommodating cylinder 1 includes a first smoke exhaust pipe 102 and a second smoke exhaust pipe 103, and the anti-backdraft structure 5 can be installed at the connection between the first smoke exhaust pipe 102 and the second smoke exhaust pipe 103.

[0045] In one embodiment, as shown in Figure 1 , Figure 4 and Figure 5 , the sealing and fitting part 301 is arranged around the edge of the smoke port 6 of the sealing ring 3, the sealing and fitting part 301 extends to the upper surface of the annular support 4 through the smoke port 6 of the annular support 4 and is adapted to be fitted with the anti-backdraft cover 502; the lower surface of the annular support 4 is provided with an annular flip 402, and the annular flip 402 surrounds the sealing and fitting part 301 and is fitted with the upper surface of the sealing ring 3. The anti-backdraft cover 502 is fitted with the sealing and fitting part 301, on the one hand, the anti-backdraft cover 502 itself can block the external air from entering; on the other hand, the anti-backdraft cover 502 is further fitted with the sealing and fitting part 301 to further enhance the sealing effect, effectively preventing the backflow of cold air and the leakage of flue gas. In addition, by arranging the annular flip 402 on the lower surface of the annular support 4 and fitting the annular flip 402 with the upper surface of the sealing ring 3, the sealing ring 3 can be stably clamped between the annular support 4 and the annular base 2, so as to avoid the displacement or deformation of the sealing ring 3, thereby further ensuring the sealing performance of the sealing ring 3, reducing the possibility of backflow of outdoor cold air, and reducing the risk of freezing the machine of the gas water heater.

[0046] In one embodiment, as shown in Figure 5 and Figure 6As shown, the sealing and fitting part 301 is an inclined flange, which is arranged to be inclined away from or close to the axis of the smoke passing port 6 and protrudes from the upper surface of the annular support 4, and the anti-backhauling cover 502 abuts against the inclined flange in the capped state. Since the inclined flange is arranged to be inclined away from or close to the axis of the smoke passing port 6, the inclined flange can automatically adjust the fitting degree with the anti-backhauling cover 502 under different pressures, always maintaining a good sealing state, and ensuring that the abnormal flow of air and smoke can be effectively prevented under various working conditions. In addition, since the inclined flange protrudes from the upper surface of the annular support 4, the inclined flange can first contact the anti-backhauling cover 502 during the capping process of the anti-backhauling cover 502, avoiding interference of the annular support 4 with the capping of the anti-backhauling cover 502, and ensuring the sealing performance of the anti-backhauling structure.

[0047] In one embodiment, as shown in Figure 5 and Figure 6 As shown, the upper surface of the sealing ring 3 is also provided with an annular groove 302 surrounding the sealing and fitting part 301, and the annular support 4 is inserted into the annular groove 302 to cooperate with the sealing ring 3 through the annular flange 402. In this embodiment, the annular groove 302 cooperating with the annular flange 402 is arranged on the sealing ring 3, which can simplify the installation process and enable the operator to install and match the annular support 4 and the sealing ring 3 within a short time, and can prevent relative displacement between the two, ensuring that the sealing ring 3 is always at the preset position, thereby continuously and effectively playing a sealing role.

[0048] In one embodiment, the first flange 401 is also provided with at least one limiting part 403, which is inclined away from or close to the axis of the annular support 4, and the limiting part 403 is used to limit the maximum opening angle of the anti-backhauling cover 502. Since the limiting part 403 is inclined away from or close to the axis of the annular support 4, when the anti-backhauling cover 502 is opened to a certain angle, the surface of the anti-backhauling cover 502 can contact the limiting part 403, which can ensure that the anti-backhauling cover 502 will not be opened excessively due to excessive wind force, and the opening angle of the anti-backhauling cover 502 is kept within a reasonable range. In this way, it not only ensures that the smoke can be smoothly discharged through the smoke passing port 6, but also avoids the problem that the anti-backhauling cover 502 cannot be capped due to excessive opening.

[0049] In one embodiment, as shown in Figure 1As shown, the smoke passing openings 6 of the sealing ring 3 are a pair, and the pair of smoke passing openings 6 are arranged symmetrically about the center line of the sealing ring 3; the smoke passing openings 6 of the annular base 2 and the smoke passing openings 6 of the annular support 4 are also a pair and are arranged one-to-one corresponding to the pair of smoke passing openings 6 of the sealing ring 3. The pair of smoke passing openings 6 are arranged symmetrically, which can not only achieve uniform distribution of smoke and improve the stability of smoke conveying, but also ensure that the sealing ring 3 is uniformly stressed in all directions and enhances its sealing performance. In addition, the corresponding arrangement of the smoke passing openings 6 of the annular base 2 and the smoke passing openings 6 of the annular support 4 with the smoke passing openings 6 of the sealing ring 3 can ensure the smoothness of the flow of smoke in the containing cylinder 1 and avoid the accumulation of smoke in the containing cylinder 1 for a long time.

[0050] In one embodiment, as shown in Figure 1 , Figure 4 , Figure 7 and Figure 8 , the anti-back draft cover 502 is a pair, and the pair of anti-back draft covers 502 are arranged one-to-one corresponding to the pair of smoke passing openings 6 of the annular support 4, and the two anti-back draft covers 502 are arranged on the annular support 4 by the rotating shaft 501, and the two anti-back draft covers 502 are used to open or cover the two smoke passing openings 6, respectively. In this embodiment, the rotating shaft 501 is used to rotatably connect the two anti-back draft covers 502 with the annular support 4, so that the two anti-back draft covers 502 can flexibly open or cover the smoke passing openings 6, which not only ensures the smooth discharge of smoke, but also avoids the backflow of external cold air.

[0051] In one embodiment, as shown in Figure 5 and Figure 6 , the upper surface of the annular base 2 is provided with a second flange 202 around the edge of the smoke passing opening 6 of the annular base 2, and the height of the second flange 202 is lower than the height of the sealing fitting part 301; the upper surface of the annular base 2 is provided with a third flange 203 on the side, and the supporting surface 201 is located between the second flange 202 and the third flange 203. It can be understood that if the height of the second flange 202 is greater than the height of the sealing fitting part 301, the second flange 202 will protrude from the upper surface of the sealing ring 3. Therefore, when the anti-back draft cover 502 is in the covering state, the anti-back draft cover 502 will abut against the top of the second flange 202, which will cause the sealing performance of the anti-back draft structure to decrease. In addition, since the supporting surface 201 is arranged between the second flange 202 and the third flange 203, when the sealing ring 3 is placed on the supporting surface 201, the second flange 202 and the third flange 203 can limit the displacement of the sealing ring 3 in the radial direction of the sealing ring 3 when the sealing ring 3 is subjected to external force.

[0052] In one embodiment, as shown in Figure 1 and Figure 3As shown, the first flange 401 is concave to form a positioning groove 4012 at the position of the through hole 4011, and the through hole 4011 is arranged on the groove bottom of the positioning groove 4012; the third flange 203 surrounds the outside of the first flange 401, and the third flange 203 is provided with a positioning protrusion 2031 matched with the positioning groove 4012. In this embodiment, the positioning groove 4012 is concave on the first flange 401, and the positioning protrusion 2031 matched with the positioning groove 4012 is arranged on the third flange 203, so that the accurate positioning and stable connection between the two are realized. At the same time, the assembly process is simplified, and the assembly efficiency is improved.

[0053] According to the embodiments of the utility model, on the other hand, a gas water heater is also provided, comprising: a smoke exhaust pipe and the above-mentioned anti-backdraft structure, the anti-backdraft structure is detachably arranged in the smoke exhaust pipe.

[0054] The gas water heater provided with the above-mentioned anti-backdraft structure has better sealing performance of the anti-backdraft structure in the smoke exhaust pipe than the existing gas water heater, and can effectively reduce the risk of outdoor cold air backflow into the gas water heater to cause the gas water heater to freeze. Specifically, since the first flange 401 is located on the upper surface of the annular support 4, the through hole 4011 matched with the rotating shaft 501 can be directly arranged on the first flange 401 at this time, without the need for additional cutting and bending operations on the first flange 401. In this way, the size of the notch on the first flange 401 can be reduced, the structural integrity of the annular support 4 can be ensured, and the possibility of deformation of the annular support 4 under external force can be reduced. Therefore, the annular support 4 can uniformly apply pressure to the sealing ring 3 during use, improve the flatness of the sealing ring 3, and enhance the sealing performance of the anti-backdraft structure. In addition, since no additional cutting and bending operations are required on the first flange 401 during the production of the annular support 4, the production process of the gas water heater of the embodiment can be simplified, and the production cost can also be reduced.

[0055] In the specific content of the above specific embodiments, any combination of technical features can be combined without contradiction, and in order to make the description concise, not all possible combinations of the above technical features are described, but as long as the combination of technical features does not exist contradictory, it should be considered as the scope of the description.

[0056] The specific content of the above specific embodiments only expresses several embodiments of the utility model, and the description is more specific and detailed, but it cannot be understood as a limitation on the patent scope of the utility model. It should be pointed out that for ordinary skilled persons in the art, without 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 backdraft prevention structure for a gas water heater, characterized in that: The utility model relates to a smoke exhaust device, including: A containing cylinder (1) is internally equipped with the smoke exhaust passage (101) that goes through up and down, A ring-shaped base (2) is equipped in the smoke exhaust passage (101) and is adapted with the smoke exhaust passage (101), the upper surface of ring-shaped base (2) has support surface (201), A sealing ring (3) is equipped on the support surface (201), the upper surface of sealing ring (3) has sealing lamination (301), A ring-shaped support (4) is equipped on the sealing ring (3) and is equipped with the sealing ring (3) with the ring-shaped base (2), the upper surface circumferential side in ring-shaped support (4) is equipped with first flanging (401), a pair of opposite through -hole (4011) is equipped on first flanging (401), The anti-wind mechanism (5) includes a rotating shaft (501) and an anti-wind cover (502), the anti-wind cover (502) is equipped in the through -hole (4011) through the rotating shaft (501) and is rotatably connected with the first flanging (401), the ring-shaped support (4), the sealing ring (3) and the ring-shaped base (2) all have the smoke port (6), the anti-wind cover (502) is used to open or cover the smoke port (6), when the anti-wind cover (502) covers the smoke port (6), the anti-wind cover (502) is lapped with the sealing lamination (301).

2. The wind-blocking structure according to claim 1, characterized by: The sealing lamination (301) is arranged around the edge of the smoke port (6) of the sealing ring (3), the sealing lamination (301) extends to the upper surface of the ring-shaped support (4) through the smoke port (6) of the ring-shaped support (4) and is adapted to be lapped with the anti-wind cover (502); the lower surface of the ring-shaped support (4) is provided with a ring-shaped flange (402), the ring-shaped flange (402) surrounds the sealing lamination (301) and is lapped with the upper surface of the sealing ring (3).

3. The wind-blocking structure according to claim 2, characterized by: The sealing lamination (301) is an inclined flange, the inclined flange is arranged to incline away from or close to the axis of the smoke port (6), and the inclined flange protrudes from the upper surface of the ring-shaped support (4), and the anti-wind cover (502) is in abutment with the inclined flange in the cover state.

4. The wind-blocking structure according to claim 2, characterized by: The upper surface of the sealing ring (3) is also provided with a ring-shaped groove (302) surrounding the sealing lamination (301), and the ring-shaped support (4) is inserted into the ring-shaped groove (302) through the ring-shaped flange (402) to cooperate with the sealing ring (3).

5. The wind-blocking structure according to claim 1, characterized by: At least one limiting portion (403) is further arranged on the first flange (401), the limiting portion (403) is inclined along the direction away from the axis of the ring-shaped support (4) and close to the ring-shaped support (4), and the limiting portion (403) is used to limit the maximum opening angle of the anti-wind cover (502).

6. The windproof structure according to any one of claims 1 to 5, characterized in that: The smoke passing openings (6) of the sealing ring (3) are a pair, and the pair of smoke passing openings (6) are symmetrically arranged about the center line of the sealing ring (3); the smoke passing openings (6) of the annular base (2) and the smoke passing openings (6) of the annular support (4) are also a pair and are arranged one-to-one corresponding to the pair of smoke passing openings (6) of the sealing ring (3).

7. The wind-blocking structure according to claim 6, characterized by: The anti-backdraft covers (502) are a pair, and the pair of anti-backdraft covers (502) are arranged one-to-one corresponding to the pair of smoke passing openings (6) of the annular support (4), and the two anti-backdraft covers (502) are rotatably arranged on the annular support (4) through the rotating shaft (501), and the two anti-backdraft covers (502) are respectively used for opening or covering the two smoke passing openings (6).

8. The wind-blocking structure according to any one of claims 1 to 5, characterized by: The upper surface of the annular base (2) is provided with a second flange (202) around the edge of the smoke passing opening (6) of the annular base (2), and the height of the second flange (202) is lower than the height of the sealing and fitting part (301); the upper surface of the annular base (2) is provided with a third flange (203) on the side, and the supporting surface (201) is located between the second flange (202) and the third flange (203).

9. The wind-blocking structure according to claim 8, characterized by: The first flange (401) is recessed to form a positioning groove (4012) at the part where the through hole (4011) is arranged, and the through hole (4011) is arranged on the groove bottom of the positioning groove (4012); the third flange (203) surrounds the outside of the first flange (401), and the third flange (203) is provided with a positioning protrusion (2031) used in cooperation with the positioning groove (4012).

10. A gas water heater, characterized by, The anti-backdraft structure of any one of claims 1 to 9 is detachably arranged in the smoke exhaust pipe.

Images