A new type of exhaust pipe for gas water heater

Abstract

The utility model relates to gas water heater exhaust gas technology field, propose a new exhaust pipe for gas water heater, including straight pipe section and arc pipe section, straight pipe section and arc pipe section constitute the exhaust elbow through integrated process, be equipped with the anti -inflow device of exhaust gas opening state and closed state in the exhaust elbow, anti -inflow device is in the exhaust gas opening state, to exhaust gas produced by gas water heater work, anti -inflow device is in the closed state, to block the external airflow reverse inflow exhaust pipe. By straight pipe section and arc pipe section adopt integrated process to constitute the exhaust elbow, the sealing property and the strength of overall structure have been improved significantly, avoid the problem such as weld cracking, gas leakage that traditional segmented welding process can cause, the exhaust gas opening state and closed state design of anti -inflow device, can when gas water heater work, when the flue gas goes up into the exhaust pipe, the flue gas reaches corresponding exhaust valve value and opens anti -inflow device automatically, to exhaust gas.

Description

Technical Field

[0001] This utility model relates to the technical field of flue gas exhaust for gas water heaters, specifically to a novel exhaust pipe for gas water heaters. Background Technology

[0002] In gas water heater exhaust systems and ventilation ducts, bends are common connecting components, typically composed of straight and curved sections, used to change the direction of the exhaust pipe connection. Traditional exhaust bend manufacturing processes usually employ segmented forming and welding assembly, where straight and curved sections are independently processed using different molds and then connected and fixed by welding.

[0003] Specifically, after straight and curved pipe sections are formed in sections, they need to be assembled by welding. This not only increases the cost and time of the welding process, but may also cause defects such as stress concentration, porosity or cracks at the weld, affecting the sealing performance and structural strength of the pipeline.

[0004] On the other hand, since straight pipe sections and curved pipe sections are produced using different molds, companies need to store and manage multiple sets of molds, occupying a large amount of factory space and increasing mold maintenance and management costs. Especially in the production mode of small batches and multiple varieties, the problems of mold switching and storage are more prominent, which restricts the flexibility and economy of production.

[0005] Therefore, the existing manufacturing process for exhaust pipe bends has the following main problems:

[0006] The production process is complicated: straight pipe sections and curved pipe sections need to be formed separately, and then welded and assembled. The process is complex and the labor and time costs are high.

[0007] Potential risks in welding quality: Welds may become weak points in the structure, affecting the pipeline's high-temperature resistance, airtightness, and fatigue life.

[0008] The molds take up a lot of space: the storage and management of two sets of independent molds increases the company's operating costs.

[0009] Low production efficiency: Mold switching and welding processes prolong the production cycle, making it difficult to meet the demand for large-volume, rapid delivery. Utility Model Content

[0010] This utility model proposes a novel exhaust pipe for gas water heaters. By using an integrated molding process to form an exhaust bend from a straight pipe section and an arc-shaped pipe section, the overall sealing and strength of the structure are significantly improved, avoiding problems such as weld cracking and air leakage that may occur with traditional segmented welding processes. The design of the anti-airflow device allows for both open and closed states. When the gas water heater is operating, if flue gas rises into the exhaust pipe and reaches a certain discharge threshold, the anti-airflow device automatically opens to discharge the flue gas. When the flue gas does not reach the discharge threshold, the anti-airflow device remains closed, effectively preventing external cold air from flowing back into the exhaust pipe and affecting the burner, thus preventing external cold air from entering the gas water heater and extinguishing the flame. Furthermore, the integrated molding process reduces production steps, lowers mold management costs, and improves production efficiency.

[0011] A new type of exhaust pipe for gas water heaters, designed for this purpose, includes straight pipe sections and curved pipe sections.

[0012] The straight pipe section and the arc-shaped pipe section are integrally formed to form the exhaust bend;

[0013] The exhaust bend is equipped with an anti-airflow device that allows for both open and closed exhaust states.

[0014] The anti-airflow device is in the smoke exhaust open state to exhaust the flue gas generated by the gas water heater during operation;

[0015] The anti-airflow device is in a closed state to prevent external airflow from flowing back into the exhaust pipe.

[0016] The anti-airflow device is installed in the straight section of the exhaust bend.

[0017] The anti-wind-in device is a gravity flap type structure, which includes a smoke exhaust bracket and smoke exhaust blades rotatably mounted on the smoke exhaust bracket. The smoke exhaust bracket is provided with a smoke exhaust port corresponding to the smoke exhaust blades.

[0018] The exhaust blade closes the exhaust port by its own weight when the exhaust bend is not in the exhaust state.

[0019] The exhaust blades are pushed open by the smoke, and the smoke is discharged out of the exhaust bend along the exhaust port.

[0020] A rotating shaft is provided between the smoke exhaust bracket and the smoke exhaust blades, and the smoke exhaust blades are rotatably connected to the smoke exhaust bracket through the rotating shaft; the smoke exhaust bracket is provided with a support step, and the smoke exhaust blades are positioned on the support step of the smoke exhaust bracket by their own weight when the smoke exhaust bend is not in the smoke exhaust state.

[0021] The exhaust bracket is equipped with a limiting component at the position where the exhaust blades rotate to open the exhaust port, so as to limit the rotation angle of the exhaust blades when they rotate to open the exhaust port.

[0022] The anti-airflow device is fixed by welding inside the straight section of the exhaust bend, or a connector is provided between the anti-airflow device and the straight section, and the anti-airflow device and the straight section are fixedly connected by the connector.

[0023] The anti-airflow device includes a smoke exhaust bracket that is fixed to the inside of a straight pipe section by welding or connecting parts.

[0024] The smoke exhaust bracket has a ring-shaped structure and abuts against the inside of the straight pipe section.

[0025] The straight pipe section is provided in two parts, and the two straight pipe sections are respectively set at the ends of the arc-shaped pipe section at corresponding positions.

[0026] The arc-shaped pipe section is provided with a corrugated structure for vibration reduction and noise reduction, as well as for improving the deformation resistance of the arc-shaped pipe section. The outer surface of the arc-shaped pipe section has a corrugated structure, and the inner side of the arc-shaped pipe section forms a number of undulating grooves.

[0027] The beneficial technical effects of this utility model are as follows:

[0028] By using a one-piece molding process to form the exhaust bend between straight and curved pipe sections, the overall sealing and strength of the structure are significantly improved, avoiding problems such as weld cracking and air leakage that may occur with traditional segmented welding processes. The anti-airflow device's open and closed state design allows it to automatically open when flue gas enters the exhaust pipe and reaches the corresponding discharge threshold during gas water heater operation, thus expelling the flue gas. When the flue gas does not reach the corresponding discharge threshold, the anti-airflow device remains closed, effectively preventing external cold air from flowing back into the exhaust pipe and affecting the burner's combustion process, thus preventing external cold air from entering the gas water heater along the exhaust pipe and extinguishing the burner flame. Furthermore, the one-piece molding process reduces production steps, lowers mold management costs, and improves production efficiency. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the external structure of a smoke exhaust pipe according to an embodiment of the present invention.

[0030] Figure 2 This is a schematic diagram of the internal structure of a smoke exhaust pipe according to an embodiment of the present invention.

[0031] Figure 3 This is a schematic diagram of the anti-wind-injection device according to another embodiment of the present invention. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. In order to make the above-mentioned objects, features and advantages of the present application more apparent and understandable, many specific details are set forth in the following description in order to provide a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0033] See Figures 1-2 A new type of exhaust pipe for gas water heaters, comprising a straight pipe section 1 and an arc-shaped pipe section 2.

[0034] The straight pipe section 1 and the arc-shaped pipe section 2 are integrally formed to form the exhaust bend 3;

[0035] The exhaust pipe 3 is equipped with an anti-airflow device 4 that allows for both open and closed exhaust states.

[0036] The anti-airflow device 4 is in the smoke exhaust open state to exhaust the smoke generated by the gas water heater during operation;

[0037] The anti-airflow device 4 is in a closed state to prevent external airflow from flowing back into the exhaust pipe.

[0038] By using a one-piece molding process to form the exhaust bend 3, the sealing and strength of the overall structure are significantly improved, avoiding problems such as weld cracking and air leakage that may occur with traditional segmented welding processes. The anti-airflow device 4 is designed with open and closed states. When the gas water heater is operating, if flue gas rises into the exhaust pipe and reaches the corresponding discharge threshold, the anti-airflow device 4 automatically opens to discharge the flue gas. When the flue gas does not reach the corresponding discharge threshold, the anti-airflow device 4 remains closed, effectively preventing external cold air from flowing back into the exhaust pipe and affecting the burner's combustion operation. It also prevents external cold air from entering the gas water heater along the exhaust pipe and extinguishing the burner flame. Furthermore, the one-piece molding process reduces production steps, lowers mold management costs, and improves production efficiency.

[0039] The anti-airflow device 4 is installed in the straight section 1 of the exhaust bend 3.

[0040] By placing the anti-airflow device 4 inside the straight section 1 of the exhaust bend 3, the ease of installation is significantly improved. The straight structure of the straight section 1 provides a standardized installation reference for the anti-airflow device 4, which is inserted into the inner cavity of the straight section 1.

[0041] The anti-wind-in device 4 is a gravity flap structure, which includes a smoke exhaust bracket 5 and a smoke exhaust blade 6 rotatably mounted on the smoke exhaust bracket 5. The smoke exhaust bracket 5 is provided with a smoke exhaust port 7 corresponding to the smoke exhaust blade 6.

[0042] When the smoke exhaust blade 6 is not exhausting smoke from the smoke exhaust bend 3, it closes the smoke exhaust port 7 by its own weight.

[0043] The exhaust blades 6 are pushed open by the smoke, and the smoke is discharged out of the exhaust bend 3 through the exhaust port 7.

[0044] Automatic control is achieved through the cooperation of the exhaust bracket 5 and the exhaust blades 6. When the flue gas pressure reaches the set value, the exhaust blades 6 open to allow the flue gas to be discharged from the exhaust port 7; when the pressure is insufficient, the exhaust blades 6 automatically close due to gravity, tightly blocking the reverse airflow. This structure requires no external power, responds quickly and reliably, effectively prevents cold air backflow from extinguishing the burner flame, and has advantages such as simple structure and ensuring long-term stable operation of the exhaust system.

[0045] A rotating shaft is provided between the smoke exhaust bracket 5 and the smoke exhaust blade 6, and the smoke exhaust blade 6 is rotatably connected to the smoke exhaust bracket 5 through the rotating shaft; the smoke exhaust bracket 5 is provided with a support step 8, and the smoke exhaust blade 6 is positioned on the support step 8 of the smoke exhaust bracket 5 by its own weight when the smoke exhaust bend 3 is not in the smoke exhaust state.

[0046] The exhaust bracket 5 and the exhaust blade 6 are connected by a rotating shaft. The exhaust bracket 5 is provided with a support step 8 so that when the exhaust blade 6 is closed, it can be accurately positioned on the support step 8 and block and close the exhaust port 7, preventing the exhaust blade 6 from falling out of the exhaust bracket 5 and preventing the exhaust port 7 from being in the open state.

[0047] The smoke exhaust bracket 5 is provided with a limiting component at the position where the smoke exhaust blade 6 rotates to open the smoke exhaust port 7, so as to limit the rotation angle of the smoke exhaust blade 6 to open the smoke exhaust port 7.

[0048] The smoke exhaust bracket 5 is equipped with two smoke exhaust ports 7, and each smoke exhaust port 7 is equipped with a rotating smoke exhaust blade 6. The setting of the limiting component precisely controls the maximum opening angle of the smoke exhaust blade 6, avoiding excessive opening due to strong wind or smoke impact, which would cause the smoke exhaust blade 6 to rotate to the other smoke exhaust port 7, effectively preventing the anti-wind-in device 4 from failing.

[0049] The anti-airflow device 4 is fixed in the straight pipe section 1 of the exhaust bend 3 by welding, or a connector is provided between the anti-airflow device 4 and the straight pipe section 1, and the anti-airflow device 4 and the straight pipe section 1 are fixedly connected by the connector.

[0050] The anti-airflow device 4 is fixed to the straight pipe section 1 by welding or by connectors, providing two reliable installation options. Welding ensures a permanent and secure connection, while connectors facilitate the installation of the anti-airflow device 4. This design enhances the overall stability of the device, ensuring that the anti-airflow device 4 maintains precise opening and closing performance over a long period, providing continuous smoke exhaust while effectively preventing cold air backflow and protecting the burner for normal operation.

[0051] The anti-airflow device 4 includes a smoke exhaust bracket 5 that is fixed to the inside of the straight pipe section 1 by welding or connecting parts.

[0052] The smoke exhaust bracket 5 has a ring-shaped structure and abuts against the inner side of the straight pipe section 1.

[0053] The smoke exhaust bracket 5 is fixed to the inside of the straight pipe section 1 by welding or connectors to ensure the accurate positioning and stability of the anti-airflow device 4. This design allows the smoke exhaust bracket 5 to fit tightly against the pipe wall of the straight pipe section 1, reducing the possibility of air leakage.

[0054] Two straight pipe sections 1 are provided, and the two straight pipe sections 1 are respectively located at the ends of the arc-shaped pipe section 2 at corresponding positions. One straight pipe section 1 is used to connect to the top exhaust structure of the gas water heater, and the other straight pipe section 1 is used to connect to an additional exhaust pipe.

[0055] The arc-shaped pipe section 2 is provided with a corrugated structure 9 for vibration reduction and noise reduction, and for improving the deformation resistance of the arc-shaped pipe section 2. The outer surface of the arc-shaped pipe section 2 has a corrugated structure, and the inner side of the arc-shaped pipe section 2 forms a number of undulating grooves.

[0056] The corrugated structure 9 of the arc-shaped pipe section 2 effectively absorbs thermal expansion and contraction stress through its undulating groove design, preventing pipe deformation. The corrugated structure also optimizes airflow distribution, reduces eddies and noise, and significantly enhances the rigidity of the pipe section, enabling it to withstand external wind pressure and internal flue gas impact. This design greatly improves the durability and reliability of the exhaust pipe, ensuring stable operation of the exhaust system under various environmental conditions and effectively protecting the burner from external wind interference over a long period.

[0057] Alternatively, the aforementioned anti-airflow device 4 can also be an elastic baffle structure, which includes a smoke exhaust bracket 5 and smoke exhaust blades 6 that are elastically and movable on the smoke exhaust bracket 5. The smoke exhaust bracket 5 is provided with a smoke exhaust port 7 corresponding to the smoke exhaust blades 6.

[0058] The exhaust blade 6 closes the exhaust port 7 by elastic force when the exhaust bend 3 is not in the exhaust state.

[0059] The spring between the smoke exhaust bracket 5 and the smoke exhaust blade 6 is vertically installed between the smoke exhaust bracket 5 and the smoke exhaust blade 6. One end of the spring abuts against the smoke exhaust bracket 5 and the spring abuts against the smoke exhaust blade 6, so that the smoke exhaust blade 6 can move up and down elastically on the smoke exhaust bracket 5.

[0060] The two exhaust blades are removed, and the exhaust port 7 is sealed better through elasticity. The exhaust port 7 is replaced with an exhaust hole, increasing the strength of the exhaust bracket 5, and eliminating the need for an exhaust port 7 with a larger perforation.

[0061] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A novel exhaust pipe for a gas water heater, comprising a straight pipe section (1) and an arc-shaped pipe section (2), characterized in that: The straight pipe section (1) and the arc-shaped pipe section (2) are integrally formed to form the exhaust bend (3). The exhaust pipe (3) is equipped with an anti-airflow device (4) for the exhaust opening and closing states. The anti-airflow device (4) is in the smoke exhaust open state to exhaust the smoke generated by the gas water heater during operation; The anti-airflow device (4) is in a closed state to prevent external airflow from flowing back into the exhaust pipe.

2. The novel exhaust pipe for a gas water heater according to claim 1, characterized in that: The anti-airflow device (4) is installed in the straight section (1) of the exhaust bend (3).

3. The novel exhaust pipe for a gas water heater according to claim 1, characterized in that: The anti-wind-in device (4) is a gravity flap structure, which includes a smoke exhaust bracket (5) and a smoke exhaust blade (6) rotatably mounted on the smoke exhaust bracket (5). The smoke exhaust bracket (5) is provided with a smoke exhaust port (7) corresponding to the smoke exhaust blade (6). The exhaust blade (6) closes the exhaust port (7) by its own weight when the exhaust pipe (3) is not in the exhaust state. The exhaust blades (6) are pushed open by the smoke, and the smoke is discharged out of the exhaust bend (3) through the exhaust port (7).

4. The novel exhaust pipe for a gas water heater according to claim 3, characterized in that: A rotating shaft is provided between the smoke exhaust bracket (5) and the smoke exhaust blade (6), and the smoke exhaust blade (6) is rotatably connected to the smoke exhaust bracket (5) through the rotating shaft; the smoke exhaust bracket (5) is provided with a support step (8), and the smoke exhaust blade (6) is positioned on the support step (8) of the smoke exhaust bracket (5) by its own weight when the smoke exhaust bend (3) is not in the smoke exhaust state.

5. The novel exhaust pipe for a gas water heater according to claim 3, characterized in that: The exhaust bracket (5) is provided with a limiting member at the position corresponding to the exhaust blade (6) rotating to open the exhaust port (7), so as to limit the rotation angle of the exhaust blade (6) rotating to open the exhaust port (7).

6. The novel exhaust pipe for a gas water heater according to claim 1, characterized in that: The anti-airflow device (4) is fixed in the straight pipe section (1) of the exhaust bend (3) by welding, or a connector is provided between the anti-airflow device (4) and the straight pipe section (1), and the anti-airflow device (4) and the straight pipe section (1) are fixedly connected by the connector.

7. The novel exhaust pipe for a gas water heater according to claim 5, characterized in that: The anti-airflow device (4) includes a smoke exhaust bracket (5) fixed to the inside of the straight pipe section (1) by welding or connecting parts.

8. The novel exhaust pipe for a gas water heater according to claim 7, characterized in that: The smoke exhaust bracket (5) has a ring-shaped structure and abuts against the inside of the straight pipe section (1).

9. The novel exhaust pipe for a gas water heater according to claim 1, characterized in that: There are two straight pipe sections (1), and the two straight pipe sections (1) are respectively set on the ends of the arc-shaped pipe section (2) at the corresponding positions.

10. The novel exhaust pipe for a gas water heater according to claim 1, characterized in that: The arc-shaped pipe section (2) is provided with a corrugated structure (9) for vibration reduction and noise reduction, and for improving the deformation resistance of the arc-shaped pipe section (2). The outer surface of the arc-shaped pipe section (2) has a corrugated structure, and the inner side of the arc-shaped pipe section (2) forms several undulating grooves.

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