Blocking covers, exhaust pipes, exhaust systems and gas water heaters

Abstract

The present invention relates to the technical field of water heaters, and more particularly to a plugging cover, a smoke exhaust pipe, a smoke exhaust system, and a gas water heater. The plugging cover is adapted to be connected to a pipe body of the smoke exhaust pipe, the pipe body having an open end. The plugging cover comprises a cover body, a cup body connected to the edge of the cover body, and a flange connected to the cup body. The cover body and the cup body are both adapted to be embedded in the pipe body. The outer wall of the cup body is adapted to form a flow channel for smoke flow between the outer wall of the cup body and the inner wall of the pipe body. The flange is adapted to abut against the end of the pipe body. The cup body is provided with a flow opening connecting the flow channel and the inner side of the cup body. When the plugging cover is assembled to the pipe body, it can provide protection from rain, wind, and frost.

Description

Technical Field

[0001] The present invention relates to the technical field of water heaters, and in particular to a blocking cover, a smoke exhaust pipe, a smoke exhaust system and a gas water heater. Background Art

[0002] A gas water heater, also known as a gas water heater, uses gas as fuel, heating water through combustion and transferring heat to cold water flowing through a heat exchanger to produce hot water. Its advantages are instant turn-on and immediate use, requiring no waiting time, and a small footprint. In terms of safety, gas water heaters separate heat generation and heat supply, allowing users to use them in the bathroom or kitchen, thus avoiding the risk of leaks during bathing.

[0003] like Figures 1 to 5 As shown, a gas water heater generally discharges the smoke generated by combustion to the outside through a smoke exhaust pipe 100. Considering the wind resistance, the smoke exhaust pipe 100 generally includes a pipe body 101 and a plurality of smoke exhaust holes 102 evenly distributed along the radial direction. The function of the smoke exhaust holes 102 is to discharge the harmful smoke generated by combustion to the outside. Since this type of smoke exhaust pipe 100 has connecting strips 103 between the smoke exhaust holes 102 along the circumferential direction, if the smoke exhaust pipe is installed horizontally and the connecting strip 103 is just at the bottom, as shown in FIG. Figure 4 Rainwater that pours into the exhaust port 102 from the top along directions A and B will enter the gas water heater along direction C on the bottom connecting strip 103. Rainwater contains sulfur dioxide and other acidic substances, which can corrode the flue pipe and the entire unit, shortening the life of the unit. Furthermore, during the manufacture of the exhaust pipe, the pipe body 101 and the plug cover 104 must be welded together, which complicates the manufacturing process and increases manufacturing costs. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the smoke exhaust pipe is easily shortened due to rainwater backflow, thereby providing a plugging cover, smoke exhaust pipe, smoke exhaust system and gas water heater that are not prone to rainwater backflow.

[0005] In order to solve the above technical problems, the present invention provides a blocking cover suitable for being connected to the tube body of a smoke exhaust pipe, the tube body having an end opening, the blocking cover comprising a cover body, a cup body connected to the edge of the cover body, and a flange connected to the cup body, the cover body and the cup body both being suitable for being embedded in the tube body, the outer wall of the cup body being suitable for forming a flow channel suitable for smoke flow between it and the inner wall of the tube body, the flange being suitable for abutting against the end of the tube body, and the cup body being provided with a flow opening connecting the flow channel and the inner side of the cup body.

[0006] Optionally, the outer wall of the cup body is provided with a groove, the groove extends in a direction parallel to the axial direction of the cup body, and the groove wall of the groove is suitable for forming the flow channel with the inner wall of the tube body.

[0007] Optionally, a plurality of grooves are evenly distributed along the circumference of the cup body.

[0008] Optionally, the cup body is suitable for interference fit connection with the tube body.

[0009] Optionally, the flow port is provided at one end of the groove close to the flange.

[0010] Optionally, a windshield is formed on one side of the groove close to the flange, the windshield protrudes from the inner wall of the flange, and the windshield is suitable for changing the flow direction of the smoke flowing through the flow port.

[0011] Optionally, the flange is located at an end of the cup body away from the cover body.

[0012] Optionally, the blocking cover is made of plastic or aluminum alloy.

[0013] The present invention also provides a smoke exhaust pipe, comprising a pipe body and the blocking cover.

[0014] The present invention also provides a smoke exhaust system, comprising the smoke exhaust pipe.

[0015] The present invention also provides a gas water heater comprising the smoke exhaust pipe.

[0016] The technical solution of the present invention has the following advantages:

[0017] 1. The plugging cover provided by the present invention is actually used by embedding the cover body and the cup body of the plugging cover into the tube body so that the flange and the end of the tube body are butted against each other. After reaching the cover body, the smoke generated during combustion flows through the flow channel formed between the outer wall of the cup body and the inner wall of the tube body, and then flows from the flow port on the cup body to the inner side of the cup body, and finally is discharged, completing the smoke exhaust function. When it rains, if the end opening position of the smoke exhaust pipe is exposed to the outdoors or in a position where rain can fall, since the outer wall of the smoke exhaust pipe is a closed structure, no matter what direction the rainwater flows, such as in a direction perpendicular to the axial direction of the tube body or in an inclined direction, it cannot enter the interior of the smoke exhaust pipe, thus eliminating the possibility of rainwater entering the main body of the gas water heater from the source, thereby eliminating the occurrence of electrical safety accidents caused by rainwater entering the machine and accidents of rainwater corroding the machine, ensuring the safety of the water heater and increasing the service life of the water heater. When there is a breeze or a typhoon, if the wind blows perpendicularly to the axial direction of the exhaust pipe, the exhaust pipe's outer wall is closed and the wind cannot enter the main body of the gas water heater. If the wind blows parallel to the axial direction of the exhaust pipe, the wind is blocked by the cover and flange and cannot enter the main body of the gas water heater. If the wind blows at an angle to the axial direction of the exhaust pipe, it obviously cannot enter the main body of the gas water heater, thus providing typhoon protection. In winter, if cold air blows perpendicularly to the axial direction of the exhaust pipe, the exhaust pipe's outer wall is closed and the cold air cannot enter the main body of the gas water heater. If the cold air blows parallel to the axial direction of the exhaust pipe, the cold air is blocked by the cover and flange and cannot enter the main body of the gas water heater. If the cold air blows at an angle to the axial direction of the exhaust pipe, it obviously cannot enter the main body of the gas water heater, thus providing frost protection. Therefore, after the plugging cover is assembled on the pipe body, it can play the role of preventing rain, wind and freezing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a schematic diagram of a gas water heater in the prior art;

[0020] Figure 2 It is a structural diagram of a smoke exhaust pipe in the prior art;

[0021] Figure 3 It is a partial cross-sectional view of a smoke exhaust pipe in the prior art;

[0022] Figure 4 for Figure 3 A partial enlarged view of

[0023] Figure 5 It is a structural diagram of a blocking cover in the prior art;

[0024] Figure 6 This is a schematic structural diagram of the blocking cover provided in Example 1 of the present invention when it is at an angle;

[0025] Figure 7 This is a schematic structural diagram of the blocking cover provided in Example 1 of the present invention at another angle;

[0026] Figure 8 for Figure 6 A cross-sectional view of the plug cover shown;

[0027] Figure 9 for Figure 8 The enlarged view of M;

[0028] Figure 10 This is a schematic structural diagram of the smoke exhaust pipe provided in Example 2 of the present invention;

[0029] Figure 11 for Figure 10 The enlarged view of P;

[0030] Figure 12 This is a schematic diagram of the connection between the smoke exhaust pipe provided in Example 2 of the present invention and the main body of the gas water heater;

[0031] Figure 13 is a schematic diagram of smoke flow;

[0032] Figure 14 for Figure 13 The enlarged view of R;

[0033] Figure 15 This is a schematic diagram of the wind blowing towards the exhaust pipe;

[0034] Figure 16 for Figure 15 The enlarged view of Q;

[0035] Figure 17 This is a schematic diagram of rainwater falling onto the exhaust pipe.

[0036] Description of reference numerals:

[0037] 2. Plug cover; 201. Cover body; 202. Cup body; 2021. Flow port; 2022. Groove; 2023. Wind shield; 203. Flange; 3. Tube body; 301. End opening; 302. First section; 303. Second section; 304. Pleated section; 4. Main body. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of the present invention, 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 may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0041] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] Example 1

[0043] This embodiment provides a plugging cover 2 , which is suitable for being connected to a pipe body 3 of a smoke exhaust pipe. The pipe body 3 has an end opening 301 .

[0044] In one embodiment, Figures 6 to 9 As shown, the blocking cover 2 includes a cover body 201, a cup body 202 connected to the edge of the cover body 201, and a flange 203 connected to the cup body 202. The cover body 201 and the cup body 202 are both suitable for being embedded in the tube body 3. The outer wall of the cup body 202 is suitable for forming a flow channel suitable for smoke circulation between the outer wall of the cup body 202 and the inner wall of the tube body 3. The flange 203 is suitable for abutting against the end of the tube body 3. The cup body 202 is provided with a flow port 2021 connecting the flow channel and the inner side of the cup body 202.

[0045] In this embodiment, in actual application, the cover 201 and the cup 202 of the plug cover 2 are embedded in the tube 3, so that the flange 203 and the end of the tube 3 are against each other. When the smoke generated during combustion reaches the cover 201, Figure 13 and Figure 14 In the J direction, the smoke flows through the flow channel formed between the outer wall of the cup body 202 and the inner wall of the tube body 3, and then flows from the flow port 2021 on the cup body 202 to the inner side of the cup body 202, and finally discharged to complete the smoke exhaust function. When it rains, if the end opening 301 of the smoke exhaust pipe is exposed to the outdoors or in a position where rain can fall, since the outer wall of the tube body 3 of the smoke exhaust pipe is a closed structure, no matter what direction the rain flows, such as Figure 17 As shown, for example, rainwater cannot enter the exhaust pipe in the axial direction (D direction) perpendicular to the pipe body 3 or in the inclined direction F, thus preventing rainwater from entering the main body 4 of the gas water heater from the source, thereby preventing electrical safety accidents caused by rainwater entering the machine and accidents of rainwater corroding the machine, ensuring the safety of the water heater and increasing the service life of the water heater. When there is wind or typhoon, Figure 15 As shown, when the wind blows toward the exhaust pipe in a direction perpendicular to the axial direction of the pipe body 3 (direction A), the wind cannot enter the main body 4 of the gas water heater because the outer wall of the pipe body 3 of the exhaust pipe is a closed structure; Figure 16 As shown, when the wind blows toward the exhaust pipe in the axial direction (E direction) parallel to the pipe body 3, the wind is blocked due to the arrangement of the cover 201 and the flange 203 and cannot enter the main body 4 of the gas water heater; further reference is made to Figure 15 When the wind blows toward the exhaust pipe in a direction that is tilted to the exhaust pipe axis (direction B), it is obvious that the wind cannot enter the main body 4 of the gas water heater, thereby playing a typhoon-proof role. Figure 15 As shown, when the cold air blows toward the exhaust pipe in a direction perpendicular to the axial direction of the pipe body 3 (direction A), the cold air cannot enter the main body 4 of the gas water heater due to the closed structure of the outer wall of the pipe body 3 of the exhaust pipe; when the cold air blows toward the exhaust pipe in a direction parallel to the axial direction of the pipe body 3 (direction E), the cold air is blocked due to the arrangement of the cover body 201 and the flange 203 and cannot enter the main body 4 of the gas water heater; further reference is made to Figure 15 When cold air blows toward the exhaust pipe in a direction oblique to the exhaust pipe axis (direction B), it obviously cannot enter the main body 4 of the gas water heater, thereby playing an anti-freezing role. Therefore, after the plug cover 2 is assembled on the pipe body 3, it can play an anti-rain, wind and anti-freeze role.

[0046] Among them, the main body 4 of the gas water heater is preferably but not limited to being composed of a valve body assembly, a main burner, a low-fire burner, a heat exchanger, a safety device, etc., which are well known to those skilled in the art and will not be described in detail here.

[0047] Specifically, the flange 203 protrudes from the cup body 202 , thereby forming a step surface between the flange 203 and the cup body 202 , and the step surface abuts against the end of the tube body 3 .

[0048] Based on the above embodiment, in a preferred embodiment, the outer wall of the cup body 202 is provided with a groove 2022, and the groove 2022 extends in a direction parallel to the axial direction of the cup body 202. The groove wall of the groove 2022 is suitable for forming a flow channel with the inner wall of the tube body 3. In this embodiment, by forming the groove 2022 on the outer wall of the cup body 202, the remaining part of the cup body 202 can contact the inner wall of the tube body 3, which, on the one hand, allows the smoke to be discharged smoothly, and on the other hand, ensures the effect of rainproof, windproof and antifreeze. In an alternative embodiment, the flange 203 can be fixedly connected to the end of the tube body 3, and the outer diameter of the cup body 202 is smaller than the inner diameter of the tube body 3, so that a flow channel is formed between the cup body 202 and the tube body 3. In this case, the outer wall of the cup body 202 can be provided with the groove 2022, or it can be provided without the groove 2022, and the smoke can pass through the gap between the cup body 202 and the inner wall of the tube body 3.

[0049] Based on the above embodiment, in a preferred embodiment, a plurality of grooves 2022 are evenly distributed along the circumference of the cup body 202. In this embodiment, since the grooves 2022 are evenly distributed along the circumference of the cup body 202, uniform exhaust of smoke can be ensured. Of course, in other alternative embodiments, the grooves 2022 may be unevenly distributed.

[0050] Specifically, the number of the grooves 2022 is three or more, such as Figure 6 As shown, the number of the grooves 2022 is 20. Of course, this embodiment does not specifically limit the number of the grooves 2022, and it can be any number greater than three.

[0051] Based on the above embodiment, in a preferred embodiment, the cup body 202 is adapted to be connected to the tube body 3 by an interference fit. In this embodiment, since the cup body 202 is adapted to be connected to the tube body 3 by an interference fit, when connecting the plug cover 2 to the tube body 3, it is only necessary to insert the cup body 202 of the plug cover 2 into the tube body 3 to fix their position. Compared with the prior art method of welding the plug cover 2 and the tube body 3, this simplifies the assembly process.

[0052] Based on the above embodiment, the flow opening 2021 is located at the end of the groove 2022 near the flange 203. In this embodiment, since the flow opening 2021 is located at the end of the groove 2022 near the flange 203, the smoke can be ensured to travel a certain distance along the flow channel before flowing out of the flow opening 2021, extending the smoke flow path and further improving the rainproof, windproof, and frostproof functions. Of course, in other alternative embodiments, the flow opening 2021 can be located in the middle of the groove 2022.

[0053] Based on the above embodiment, in a preferred embodiment, a windshield 2023 is formed on one side of the groove 2022 close to the flange 203. The windshield 2023 protrudes from the inner wall of the flange 203 and is suitable for changing the flow direction of the smoke flowing through the flow opening 2021. In this embodiment, the arrangement of the windshield 2023 allows the smoke flowing through the flow opening 2021 to be blocked by the windshield 2023 in the axial direction, and then change its flow direction. The smoke changes from an axial flow direction to a radial flow direction and then flows out directly. At the same time, the windshield 2023 can also block the axial wind inlet, such as Figure 16 As shown, when the wind blows the smoke exhaust pipe in the axial direction parallel to the pipe body 3 (direction E), the wind is blocked due to the setting of the wind shield 2023 and cannot enter the main body 4 of the gas water heater. Therefore, it can ensure the safe discharge of smoke and prevent the wind outside the smoke exhaust pipe from blowing into the gas water heater.

[0054] Specifically, the bottom of the groove 2022 protrudes from the inner wall of the flange 203 as a whole, and one side of the flow opening 2021 does not directly extend to the flange 203 , so the groove wall at one end of the groove 2022 constitutes the wind shield 2023 .

[0055] Based on the above embodiment, in a preferred embodiment, the flange 203 is located at the end of the cup body 202 away from the cover body 201. In this embodiment, the flange 203 is the only part of the plugging cover 2 located outside the tube body 3, and the length of the plugging cover 2 is not too long.

[0056] Based on the above embodiment, in a preferred embodiment, the cover 2 is made of plastic or aluminum alloy. In this embodiment, since the smoke outlet of the smoke exhaust pipe has a temperature of approximately 120°C to 180°C when smoke is present, plastic or aluminum alloy fully meets the heat resistance requirements and also meets the corrosion and waterproof requirements. Furthermore, the cover 2 is made of plastic or aluminum alloy, which facilitates the formation of the groove 2022 and the flange 203.

[0057] Example 2

[0058] This embodiment provides a smoke exhaust pipe, such as Figures 10 to 17 As shown, it includes a tube body 3 and the blocking cover 2 provided in the above embodiment. The cover 201 and the cup 202 are both embedded in the tube body 3. A flow channel suitable for smoke circulation is formed between the outer wall of the cup 202 and the inner wall of the tube body 3. The flange 203 abuts against the end of the tube body 3. The cup 202 is provided with a flow port 2021 connecting the flow channel and the inner side of the cup 202.

[0059] When the smoke generated during combustion reaches the cover 201, Figure 13 and Figure 14In the J direction, the smoke flows through the flow channel formed between the outer wall of the cup body 202 and the inner wall of the tube body 3, and then flows from the flow port 2021 on the cup body 202 to the inner side of the cup body 202, and finally discharged to complete the smoke exhaust function. When it rains, if the end opening 301 of the smoke exhaust pipe is exposed to the outdoors or in a position where rain can fall, since the outer wall of the tube body 3 of the smoke exhaust pipe is a closed structure, no matter what direction the rain flows, such as Figure 17 As shown, for example, rainwater cannot enter the exhaust pipe in the axial direction (D direction) perpendicular to the pipe body 3 or in the inclined direction F, thus preventing rainwater from entering the main body 4 of the gas water heater from the source, thereby preventing electrical safety accidents caused by rainwater entering the machine and accidents of rainwater corroding the machine, ensuring the safety of the water heater and increasing the service life of the water heater. When there is wind or typhoon, Figure 15 As shown, when the wind blows toward the exhaust pipe in a direction perpendicular to the axial direction of the pipe body 3 (direction A), the wind cannot enter the main body 4 of the gas water heater because the outer wall of the pipe body 3 of the exhaust pipe is a closed structure; Figure 16 As shown, when the wind blows toward the exhaust pipe in the axial direction (E direction) parallel to the pipe body 3, the wind is blocked due to the arrangement of the cover 201 and the flange 203 and cannot enter the main body 4 of the gas water heater; Figure 15 As shown in FIG, when wind blows toward the exhaust pipe in a direction oblique to the axial direction of the exhaust pipe (direction B), it is obvious that it cannot enter the main body 4 of the gas water heater, thereby playing a typhoon protection role. In winter, when cold wind blows toward the exhaust pipe in a direction perpendicular to the axial direction of the pipe body 3 (direction A), the cold wind cannot enter the main body 4 of the gas water heater due to the closed structure of the outer wall of the pipe body 3 of the exhaust pipe; Figure 16 As shown, when the cold wind blows toward the exhaust pipe in the axial direction (E direction) parallel to the pipe body 3, the cold wind is blocked due to the arrangement of the cover 201 and the flange 203 and cannot enter the main body 4 of the gas water heater; Figure 15 As shown, when cold wind blows toward the exhaust pipe in a direction (direction B) that is tilted toward the exhaust pipe axial direction, it is obvious that the cold wind cannot enter the main body 4 of the gas water heater, thereby playing an antifreeze role. Therefore, the exhaust pipe can play the role of rainproof, windproof and antifreeze.

[0060] On the basis of the above embodiment, in a preferred embodiment, as Figure 10 As shown, the pipe body 3 includes a first section 302 and a second section 303. The first section 302 is adapted to be connected to the main body 4 of the gas water heater and is disposed in a vertical direction. The extension direction of the second section 303 forms an angle with the extension direction of the first section 302. The angle formed by the extension direction of the first section 302 and the extension direction of the second section 303 is preferably, but not limited to, an acute angle, which facilitates the installation of the pipe body 3 and smoke exhaust.

[0061] On the basis of the above embodiment, in a preferred embodiment, further reference is made to Figure 10 The pipe body 3 further includes a bendable pleated section 304 connected between the first section 302 and the second section 303. By bending the pleated section 304, the angle between the first section 302 and the second section 303 can be adjusted quickly and easily, which facilitates the installation of the gas water heater.

[0062] Example 3

[0063] This embodiment provides a smoke exhaust system, including the smoke exhaust pipe and smoke exhaust fan provided in the above embodiment 2.

[0064] The smoke exhaust system can protect against rain, wind and frost.

[0065] Example 4

[0066] This embodiment provides a gas water heater, such as Figure 12 As shown, it includes the smoke exhaust pipe and the main body 4 provided in the above embodiment 2.

[0067] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A plugging cover, characterized in that: The invention is suitable for being connected to a pipe body (3) of a smoke exhaust pipe, wherein the pipe body (3) has an end opening (301), and the blocking cover (2) comprises a cover body (201), a cup body (202) connected to the edge of the cover body (201), and a flange (203) connected to the cup body (202). The cover body (201) and the cup body (202) are both suitable for being embedded in the pipe body (3), and the outer wall of the cup body (202) is suitable for forming a flow channel suitable for smoke flow between the inner wall of the pipe body (3), and the flange (203) is suitable for abutting against the end of the pipe body (3). The cup body (202) is provided with a flow opening (2021) connecting the flow channel and the inner side of the cup body (202), so that the smoke generated during combustion flows through the flow channel formed between the outer wall of the cup body and the inner wall of the pipe body after reaching the cover body, and then flows from the flow opening on the cup body to the inner side of the cup body, and is finally discharged to complete the smoke exhaust function.

2. The plugging cover according to claim 1, characterized in that: The outer wall of the cup body (202) is provided with a groove (2022), the groove (2022) extending in a direction parallel to the axial direction of the cup body (202), and the groove wall of the groove (2022) is suitable for forming the circulation channel with the inner wall of the tube body (3).

3. The blocking cover according to claim 2, characterized in that: A plurality of grooves (2022) are evenly distributed along the circumference of the cup body (202).

4. The blocking cover according to claim 2, characterized in that: The cup body (202) is suitable for interference fit connection with the tube body (3).

5. The blocking cover according to claim 2, characterized in that: The flow port (2021) is provided at one end of the groove (2022) close to the flange (203).

6. The blocking cover according to claim 5, characterized in that: A windshield (2023) is formed on one side of the groove (2022) close to the flange (203), the windshield (2023) protruding from the inner wall of the flange (203), and the windshield (2023) is suitable for changing the flow direction of smoke flowing through the flow port (2021).

7. The plugging cover according to claim 1, characterized in that: The flange (203) is located at an end of the cup body (202) away from the cover body (201).

8. The plugging cover according to any one of claims 1 to 7, characterized in that: The blocking cover (2) is made of plastic or aluminum alloy.

9. A smoke exhaust pipe, characterized in that: It comprises a tube body (3) and a plugging cover (2) according to any one of claims 1 to 7.

10. A smoke exhaust system, characterized in that: Including the smoke exhaust pipe according to claim 9.

11. A gas water heater, characterized in that: Including the smoke exhaust pipe according to claim 9.

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