Smoke pipe assembly and gas water heating equipment

Abstract

The utility model belongs to hot water equipment technical field, specifically disclose a flue assembly and gas hot water equipment, flue assembly includes inner flue and outer flue, and the exhaust passage is formed in the inner flue, and the outer flue is fixedly covered in the inner flue outside and is formed with the inner flue cooperation and forms the air inlet, and the lateral wall of outer flue is provided with air inlet, and air inlet is set along the length direction of outer flue helically. Gas hot water equipment includes above-mentioned flue assembly, and this flue assembly and gas hot water equipment can realize the effective preheating to air, has improved the gas efficiency of gas hot water equipment.

Description

Technical Field

[0001] This utility model relates to the field of hot water equipment technology, and in particular to a flue assembly and a gas-fired hot water equipment. Background Technology

[0002] In recent years, with economic development and scientific and technological progress, people's living standards have greatly improved, and gas water heaters have begun to enter thousands of households. However, ordinary gas water heaters extract oxygen from the room for combustion during operation, thereby reducing the indoor oxygen content and posing a potential threat to users' lives. Therefore, the application of balanced flue gas water heaters is becoming increasingly widespread.

[0003] Balanced flue gas water heaters use a double-layer flue design. The outer flue draws in outdoor air for combustion, while the inner flue vents exhaust gases outdoors, avoiding the consumption of indoor air. However, in winter or other cold weather, outdoor temperatures are typically low, especially in northern regions where temperatures can reach -30°C or below. Since balanced flue gas water heaters draw air from the outside, the extremely low outdoor air temperature can negatively impact the combustion efficiency of the water heater. Utility Model Content

[0004] One of the technical problems solved by this utility model is to provide a flue assembly that can solve the problem of excessively low temperature of the extracted air;

[0005] The second technical problem solved by this utility model is to provide a gas-fired hot water device that can solve the problem of low combustion thermal efficiency due to excessively low temperature of the extracted air.

[0006] The first technical problem mentioned above is solved by the following technical solution:

[0007] The flue assembly includes an inner flue and an outer flue. An exhaust channel is formed inside the inner flue. The outer flue is fixedly sleeved outside the inner flue and cooperates with the inner flue to form an air intake channel. An air intake hole is opened on the side wall of the outer flue, and the air intake hole is spirally arranged along the length direction of the outer flue.

[0008] Compared with the prior art, the flue assembly of this utility model has the following advantages: the air inlet is set as a spiral extending along the length of the outer flue, so that the air entering the air intake channel through the air inlet is spiral. On the one hand, this effectively increases the travel distance of the air, and on the other hand, the spiral-shaped air can destroy the air flow boundary layer formed on the outer surface of the inner flue, so that the air and the high-temperature flue gas in the inner flue can fully exchange heat, thus playing the role of preheating the air.

[0009] In one embodiment, the width of the air intake gradually increases from one end near the outlet end of the air intake channel to the other end.

[0010] In one embodiment, the width ratio of the two opposite ends of the air inlet is 1:3.

[0011] In one embodiment, the helix angle of the air inlet is between 15° and 21°.

[0012] In one embodiment, the projected length of the air inlet in the axial direction of the outer smoke pipe is between 100mm and 150mm.

[0013] In one embodiment, the air inlet is located at one end of the external smoke pipe away from the outlet end of the air inlet channel.

[0014] In one embodiment, a plurality of the air inlets are spaced apart circumferentially along the outer smoke pipe, and the helical axis of the air inlets is parallel to the axis of the outer smoke pipe.

[0015] In one embodiment, the smoke outlet end of the inner smoke pipe is located inside the outer smoke pipe, and a plurality of air outlet groups are arranged circumferentially on the side wall of the outer smoke pipe. The air outlet groups are located on the side of the air inlet away from the outlet end of the air inlet channel. Each air outlet group includes at least one air outlet. The air inlet channel is sealed with a plug at the position between the air inlet and the air outlet.

[0016] In one embodiment, the flue assembly includes a straight pipe section and a curved pipe section. The straight pipe section includes an inner straight pipe and an outer straight pipe, and the curved pipe section includes an inner curved pipe and an outer curved pipe. The inner straight pipe and the inner curved pipe form the inner flue, and the outer straight pipe and the outer curved pipe form the outer flue.

[0017] The second technical problem mentioned above is solved by the following technical solution:

[0018] A gas-fired water heater includes a main unit and a flue assembly as described in any of the above-mentioned embodiments, wherein the inner flue is connected to the exhaust port of the main unit and the outer flue is connected to the air inlet of the main unit.

[0019] Compared with the prior art, the gas-fired water heater of this utility model has the following advantages: the air inlet of the flue pipe in the gas-fired water heater is set in a spiral shape, so that the air entering the air intake channel through the air inlet can fully exchange heat with the flue gas in the inner flue pipe, reducing the impact on the gas efficiency of the gas-fired water heater, thereby indirectly improving the gas efficiency of the gas-fired water heater. Attached Figure Description

[0020] Figure 1This is a front view of the flue assembly provided in the embodiment of this utility model;

[0021] Figure 2 For along Figure 1 Sectional view along the middle AA direction;

[0022] Figure 3 For along Figure 1 Sectional view along the BB direction;

[0023] Figure 4 This is an exploded structural diagram of the smoke pipe assembly provided in the embodiment of this utility model.

[0024] Label Explanation:

[0025] 1. Inner smoke pipe; 11. Inner bend pipe; 12. Inner straight pipe; 13. Bracket; 2. Outer smoke pipe; 21. Outer bend pipe; 22. Outer straight pipe; 221. Air inlet; 222. Air outlet; 23. End cap; 24. Plug; 3. Air inlet passage; 4. Exhaust passage. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] refer to Figures 1-4 As shown, an embodiment of this utility model proposes a flue assembly. Another embodiment of this utility model proposes a gas-fired water heater. The gas-fired water heater includes a main unit and the aforementioned flue assembly. The flue assembly includes an inner flue 1 and an outer flue 2. An exhaust channel 4 is formed inside the inner flue 1. The inlet end of the inner flue 1 is connected to the exhaust port of the main unit. The outer flue 2 is fixedly sleeved outside the inner flue 1 and cooperates with the outer wall of the inner flue 1 to form an air intake channel 3. The outlet end of the outer flue 2 is connected to the air intake port of the main unit. An air intake hole 221 is opened on the side wall of the outer flue 2, and the air intake hole 221 is spirally arranged along the length direction of the outer flue 2.

[0031] In the aforementioned flue assembly, when the main unit of the gas-fired water heater is started, the operation of the internal fan creates a negative pressure inside the main unit, resulting in a significant pressure difference with the outside. Air enters the intake channel 3 through the air inlet 221 and then enters the main unit to provide oxygen for the combustion of gas. Because the air inlet 221 is spiral-shaped, the air enters the intake channel 3 in a spiral motion. This effectively increases the travel distance of the air entering the main unit, and the spiral-shaped airflow can disrupt the airflow boundary layer formed on the outer surface of the inner flue 1, allowing the air to fully exchange heat with the high-temperature flue gas in the inner flue 1, thus preheating the air and improving the combustion thermal efficiency of the gas-fired water heater.

[0032] To allow air to enter the intake channel 3 from the entire air inlet 221 and form a spiral airflow, the width of the air inlet 221 gradually increases from the end near the outlet of the intake channel 3 to the end near the inlet of the intake channel 3 (the internal air pressure of the main unit is negative, and the air pressure is lower closer to the main unit. If the width of the side of the air inlet 221 near the outlet of the intake channel 3 is greater than the width of the side of the air inlet 221 near the inlet of the intake channel 3, air will preferentially enter the intake channel 3 from the side of the air inlet 221 near the first end of the external smoke pipe 2, reducing the possibility of forming a spiral airflow). For example, the width ratio of the two ends of the air inlet 221 is 1:3.

[0033] Considering both air intake performance and manufacturing difficulty, the helix angle of the air intake hole 221 is between 15° and 21°. For example, the helix angle of the air intake hole 221 can be 15°, 16°, 20°, or 21°. Specifically, when the helix angle of the air intake hole 221 is less than 15°, the air intake performance is poor; when the helix angle of the air intake hole 221 is greater than 21°, the air intake performance is good, but the manufacturing difficulty is high.

[0034] Meanwhile, the projected length of the air inlet 221 along the axial direction of the outer smoke pipe 2 is limited to between 100-150mm, for example, 100mm, 120mm, or 150mm. If the projected length of the air inlet 221 along the axial direction of the outer smoke pipe 2 is too long, the length of the outer smoke pipe 2 also needs to be increased, which will increase manufacturing costs; while if the projected length of the air inlet 221 along the axial direction of the outer smoke pipe 2 is too short, it will affect the air intake effect.

[0035] Specifically, in order to allow the air to exchange heat more fully with the high-temperature flue gas in the inner flue pipe 1, the air inlet 221 is located at the end of the outer flue pipe 2 near the plug 24, so that the high-temperature flue gas and the air have sufficient time to exchange heat.

[0036] refer to Figure 1 As shown, to further improve air intake efficiency, multiple air intake holes 221 are spaced apart circumferentially along the outer flue 2. To avoid interference between the air intake holes 221, the spiral axis of the air intake holes 221 is arranged parallel to the axis of the outer flue 2. More specifically, multiple air intake holes 221 are arranged in a circumferential array on the outer flue 2 so that air can travel evenly around the axis of the inner flue 1, further improving heat exchange efficiency. The number of air intake holes 221 is determined according to actual needs and the size of the outer flue 2, and is not specifically limited here.

[0037] refer to Figure 1 and Figure 2 As shown, the smoke outlet of the inner smoke pipe 1 is located inside the outer smoke pipe 2. Multiple sets of air outlets are spaced circumferentially on the side wall of the outer smoke pipe 2. These sets of air outlets are located on the side of the air inlet 221 away from the outlet end of the air intake channel 3. Each set of air outlets includes at least one air outlet 222. The shape of the air outlet 222 is set to square or circular, depending on the processing difficulty or actual needs; no specific limitation is made here. To prevent the smoke discharged through the air outlet 222 from remixing with air and flowing back, a plug 24 is installed in the air intake channel 3 between the air inlet 221 and the air outlet 222. The plug 24 separates the air intake channel 3 from the air outlet 222. It can be understood that the plug 24, in addition to sealing the air intake channel 3, also supports the inner smoke pipe 1. Specifically, the plug 24 is coaxially arranged with the inner smoke pipe 1 and the outer smoke pipe 2.

[0038] Furthermore, one end of the outer smoke pipe 2 near the inlet end of the air intake channel 3 is sealed with an end cap 23 to allow the smoke discharged through the inner smoke pipe 1 to better diffuse into the air. It should be emphasized that, depending on the specific needs, the end cap 23 can be either a solid end cap or a mesh end cap. A solid end cap can prevent direct exhaust of smoke, while a mesh end cap can disperse the smoke and reduce exhaust resistance.

[0039] Understandably, the air inlet and exhaust outlet of the main unit are usually located at the top. To change the direction of the exhaust, the flue assembly includes a straight section and a bend section. The bend section connects to the main unit, while the straight section extends outdoors. (Reference) Figure 2 and Figure 4 As shown, the straight pipe section includes an inner straight pipe 12 and an outer straight pipe 22, and the curved pipe section includes an inner curved pipe 11 and an outer curved pipe 21. The inner straight pipe 12 and the inner curved pipe 11 both belong to the inner smoke pipe 1, and the outer straight pipe 22 and the outer curved pipe 21 both belong to the outer smoke pipe 2. The inner curved pipe 11 is connected to the exhaust port of the main unit, the inner straight pipe 12 is located at the end of the inner curved pipe 11 away from the main unit, the outer curved pipe 21 is connected to the air inlet of the main unit, and the outer straight pipe 22 is located at the end of the outer curved pipe 21 away from the main unit.

[0040] To reduce the assembly difficulty of the flue assembly, the straight pipe section and the bend section are set separately with clearance fit. During the assembly of the flue assembly, the inner bend 11 is first assembled to the outer bend 21, and the inner straight pipe 12 is assembled to the outer straight pipe 22, and then the straight pipe section and the bend section are connected. Based on this, the bend section also includes a bracket 13, which is set in the air intake channel 3 to support the inner bend 11, so that the inner bend 11 and the outer bend 21 remain coaxial.

[0041] Specifically, the bracket 13 is configured in a U-shape and is connected to the inner bend 11 and the outer bend 21 by means including but not limited to welding. For example, there are two sets of brackets 13, each set of brackets 13 including three brackets 13 arranged circumferentially, and the two sets of brackets 13 are respectively arranged at both ends of the length of the bend section.

[0042] To further reduce the assembly difficulty of the inner bend 11 and the outer bend 21, both the inner bend 11 and the outer bend 21 are made of corrugated pipes, and the inner bend 11 is inserted into the inner straight pipe 12, and the outer bend 21 is inserted into the outer straight pipe 22.

[0043] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0044] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A flue assembly, characterized in that, The flue assembly includes: An inner smoke pipe (1) has an exhaust channel (4) formed inside it; An outer smoke pipe (2) is fixedly sleeved outside the inner smoke pipe (1) and cooperates with the inner smoke pipe (1) to form an air intake channel (3). An air intake hole (221) is provided on the side wall of the outer smoke pipe (2), and the air intake hole (221) is spirally arranged along the length direction of the outer smoke pipe (2).

2. The flue assembly according to claim 1, characterized in that, The width of the air inlet (221) gradually increases from one end near the outlet end of the air inlet channel (3) to the other end.

3. The flue assembly according to claim 2, characterized in that, The width ratio of the two ends of the air inlet (221) is 1:

3.

4. The flue assembly according to claim 1, characterized in that, The spiral angle of the air inlet (221) is between 15° and 21°.

5. The flue assembly according to claim 1, characterized in that, The projected length of the air inlet (221) in the axial direction of the outer smoke pipe (2) is between 100mm and 150mm.

6. The flue assembly according to claim 1, characterized in that, The air inlet (221) is located at one end of the outer smoke pipe (2) away from the outlet end of the air inlet channel (3).

7. The flue assembly according to claim 1, characterized in that, Multiple air inlets (221) are spaced apart circumferentially along the outer smoke pipe (2), and the spiral axis of the air inlets (221) is parallel to the axis of the outer smoke pipe (2).

8. The flue assembly according to any one of claims 1-7, characterized in that, The smoke outlet end of the inner smoke pipe (1) is located inside the outer smoke pipe (2). Multiple air outlet groups are arranged circumferentially on the side wall of the outer smoke pipe (2). The air outlet groups are located on the side of the air inlet (221) away from the outlet end of the air inlet channel (3). Each air outlet group includes at least one air outlet (222). The air inlet channel (3) is sealed with a plug (24) at the position between the air inlet (221) and the air outlet (222).

9. The flue assembly according to any one of claims 1-7, characterized in that, The flue assembly includes a straight pipe section and a curved pipe section. The straight pipe section includes an inner straight pipe (12) and an outer straight pipe (22). The curved pipe section includes an inner curved pipe (11) and an outer curved pipe (21). The inner straight pipe (12) and the inner curved pipe (11) form the inner flue (1), and the outer straight pipe (22) and the outer curved pipe (21) form the outer flue (2).

10. A gas-fired water heating device, including a main unit, characterized in that, The gas-fired water heater further includes a flue assembly as described in any one of claims 1-9, wherein the inner flue (1) is connected to the exhaust port of the main unit, and the outer flue (2) is connected to the air inlet of the main unit.

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