flue assembly and gas water heater

Abstract

This utility model discloses a flue assembly and a gas water heater, relating to the field of water heater technology. The flue assembly has independent exhaust channels and air channels. The exhaust channel is configured to communicate with the exhaust port of the gas water heater, and the air channel is configured to communicate with the air inlet of the gas water heater. The air channel has at least a first channel section, through which air flowing through the first channel section can exchange heat with the flue gas in the exhaust channel. A baffle is provided within the first channel section. This utility model's technical solution can prevent or significantly reduce the generation of condensate in gas water heaters.

Description

Technical Field

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

[0002] A gas water heater is a gas appliance that uses gas as fuel and heats water by transferring heat to cold water flowing through a heat exchanger in order to produce hot water.

[0003] In related technologies, a condenser heat exchanger for preheating water is installed inside the water heater for secondary heat exchange, absorbing heat from the flue gas. However, a lot of condensate will be generated on the surface of the condenser heat exchanger. Utility Model Content

[0004] The main purpose of this invention is to provide a flue assembly and a gas water heater that aims to prevent or significantly reduce the generation of condensate in gas water heaters.

[0005] To achieve the above objectives, the flue assembly proposed in this utility model is provided with independent smoke exhaust channels and air channels;

[0006] The air passage has at least a first passage section, through which the air flowing through the first passage section can exchange heat with the flue gas in the exhaust passage;

[0007] The first channel section is equipped with a flow-disrupting element.

[0008] In one embodiment of this application, the first channel segment surrounds the outer periphery of the smoke exhaust channel.

[0009] In one embodiment of this application, the air channel further includes a second channel section located upstream of the airflow of the first channel section and a third channel section located downstream of the airflow. The second channel section is provided with an air inlet, and the third channel section is provided with an air outlet.

[0010] The second channel segment and / or the third channel segment surround the outer periphery of the smoke exhaust channel.

[0011] In one embodiment of this application, the flue assembly includes:

[0012] A first separator, disposed within the air passage, separates the second passage segment from the first passage segment; the first separator is provided with a plurality of first air passages; and

[0013] A second separator is disposed within the air passage to separate the first passage segment from the third passage segment. The second separator is provided with a plurality of second air passages.

[0014] In one embodiment of this application, the first air passage and the second air passage are offset in the axial direction of the first passage segment;

[0015] And / or, the first separator and the second separator are mesh structures;

[0016] And / or, the first separator and the second separator are metal parts.

[0017] In one embodiment of this application, the turbulence-disrupting element is a thermally conductive flocculent material.

[0018] In one embodiment of this application, the turbulence element fills the first channel segment.

[0019] In one embodiment of this application, the flue assembly includes:

[0020] Smoke exhaust pipe, the inner cavity of which forms the smoke exhaust channel; and

[0021] An air intake pipe is sleeved on the outside of the exhaust pipe, and the gap between the air intake pipe and the exhaust pipe forms the air passage;

[0022] The baffle is located between the inner wall of the air intake pipe and the outer wall of the exhaust pipe.

[0023] To achieve the above objectives, this application also provides a gas water heater, including a main body and the aforementioned flue assembly;

[0024] The main body of the device is provided with an air inlet and a smoke outlet. The smoke pipe assembly is disposed on the main body of the device. The smoke exhaust channel is connected to the smoke outlet, and the air channel is connected to the air inlet.

[0025] In one embodiment of this application, the device body includes:

[0026] The housing has an air inlet and a smoke outlet on its top wall, and the smoke pipe assembly is installed on the top of the housing.

[0027] A combustion heat exchange chamber is disposed within the casing, and the combustion heat exchange chamber is provided with an air inlet and a smoke outlet; the air inlet is used to communicate with the air intake port; and

[0028] A fan is provided below the combustion heat exchange chamber, and the smoke outlet is connected to the smoke outlet via a pipe; or, the fan is provided above the combustion heat exchange chamber, with the air inlet of the fan connected to the smoke outlet and the air outlet of the fan connected to the smoke outlet.

[0029] In this utility model, the flue assembly is provided with independent exhaust channels and air channels. The air flowing through at least the first channel section of the air channel can exchange heat with the flue gas in the exhaust channel. At the same time, a baffle is provided in the first channel section, which can turbulent the airflow, slow down the air flow speed, prolong the heat exchange time between the air and the flue gas, effectively improve the heating efficiency of the flue gas on the air, and accelerate the reduction of the temperature difference between the flue gas and the air.

[0030] When applied to gas water heaters, the flue gas emitted after one heat exchange is heated in the flue pipe assembly to heat the incoming cold air as it is discharged to the outside. This rapid heating of the incoming cold air quickly reduces the temperature difference between it and the flue gas, thus preventing or significantly reducing the generation of condensate. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the external structure of an embodiment of the flue assembly of this utility model;

[0033] Figure 2 for Figure 1 Internal structure diagram of the embodiment;

[0034] Figure 3 for Figure 1 A schematic diagram of the internal structure after the spoiler is hidden in the embodiment;

[0035] Figure 4 This is a schematic diagram of the structure of the first separator in an embodiment of the present utility model;

[0036] Figure 5 This is a schematic diagram of the structure of the second separator in an embodiment of the present utility model;

[0037] Figure 6 This is a schematic diagram of the structure of an embodiment of the gas water heater of this utility model;

[0038] Figure 7 This is a structural schematic diagram of an embodiment of the powerful blower-type gas water heater of this utility model;

[0039] Figure 8 This is a structural schematic diagram of an embodiment of the forced-draft gas water heater of this utility model.

[0040] Explanation of icon numbers:

[0041]

[0042]

[0043] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0045] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0046] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0047] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0048] In related technologies, a condenser heat exchanger is installed inside the water heater to preheat cold water for secondary heat exchange. The cold water first exchanges heat with the flue gas exiting the main heat exchanger before flowing back into the main heat exchanger. During this process, water vapor in the flue gas easily forms a large amount of condensate on the walls of the condenser heat exchanger. Carbon dioxide and nitrogen oxides in the flue gas dissolve in the condensate, forming acidic condensate. To prevent the acidic condensate from corroding the user's metal fixtures and pipes, a condensate drain hose is required to guide it to a drain outlet. This setup necessitates a drain outlet / well at the water heater installation location or the use of a container to collect the condensate and empty it periodically, increasing installation and maintenance costs.

[0049] Therefore, this utility model proposes a flue assembly 200 for use in a gas water heater 1000, aiming to prevent or significantly reduce the generation of condensate in the gas water heater. The main body 100 of the gas water heater 1000 has an air inlet 101 and a flue outlet 102. The structure of the flue assembly 200 will be described below by way of an embodiment.

[0050] like Figures 1 to 3 as well as Figure 7 and Figure 8 As shown, the flue assembly 200 is provided with an independent exhaust channel 201 and an air channel 202; the air channel 202 has at least a first channel section 2021, through which the air flowing through the first channel section 2021 can exchange heat with the flue gas in the exhaust channel 201; the first channel section 2021 is provided with a baffle 23.

[0051] In this embodiment, the flue assembly 200 is installed on the main body 100 of the gas water heater 1000 to discharge the flue gas generated by the combustion of the gas water heater 1000 to the outside, and at the same time to introduce the air required for combustion into the main body 100. The main body 100 refers to the main structure of the gas water heater 1000, which has a combustion heat exchange chamber 12, a main heat exchanger 13, and other structures inside. The combustion heat exchange chamber 12 refers to a frame structure with a cavity inside, which can be a cylindrical frame, a rectangular frame, or some other shaped frame structure. Optionally, a burner can be installed inside or outside the combustion heat exchange chamber 12. The specific structural type can refer to the burner structure in a conventional gas water heater 1000, and will not be described in detail here. In this embodiment, the main heat exchanger 13 is a water-gas heat exchanger. Its inlet end is used to connect to the inlet water pipe, and its outlet end is used to connect to the outlet water pipe. The specific heat exchanger type can refer to the heat exchanger structure in a conventional ordinary gas water heater 1000, such as a bare tube heat exchanger, a tube-fin heat exchanger, a plate heat exchanger, a shell-and-tube heat exchanger, etc.

[0052] In this embodiment, a smoke pipe assembly 200 is provided on the main body 100 of the device. The smoke pipe assembly 200 has an independent smoke exhaust channel 201 and an air channel 202. The smoke exhaust channel 201 is used to communicate with the smoke outlet 102 of the main body 100 to exhaust smoke. The air channel 202 is used to communicate with the air inlet 101 of the main body 100 to introduce air into the main body 100. The air channel 202 has at least a first channel section 2021, and the air flowing through the first channel section 2021 can interact with the air flowing through the smoke exhaust channel 201. Through the heat exchange of flue gas, when the flue gas in the main body 100 after the first heat exchange is discharged to the outside, the flue gas will flow through the exhaust channel 201 and have a secondary heat exchange with the cold air in the first channel section 2021. The flue gas flowing through the flue pipe assembly 200 heats the air in the flue pipe assembly 200, thereby greatly increasing the temperature rise of the air in the intake. The heated air enters the main body 100 through the air inlet 101 and finally enters the combustion heat exchange chamber 12 to mix and burn with the fuel gas.

[0053] It should be noted that in this embodiment, the flue gas assembly 200 exchanges heat between the flue gas after its initial heat exchange with the main heat exchanger 13 and the incoming cold air of the equipment body 100. While recovering heat from the flue gas and improving energy efficiency, compared to the method of using a condenser heat exchanger to preheat water and recover heat in related technologies, because the specific heat capacity of air is less than that of water, the same mass of air heats up faster than water. In other words, air is easier to heat than water. Therefore, the temperature difference between the air passage 202 and the exhaust passage 201 in the flue gas assembly 200 will be less than [a certain value]. When using a condensing heat exchanger, the temperature difference between the water flow channel and the flue gas determines the likelihood of condensation. Since condensation is more likely to occur when the cold side temperature is lower and less likely to occur when the cold side temperature is higher, the intake air in this embodiment can be heated to above the flue gas condensate dew point temperature more quickly than cold water, thus making it less likely to produce condensate. Even if a very small amount of condensate is generated at the end of the exhaust channel 201, which is far from the main body 100, it will not easily flow into the main body 100. Instead, it will be quickly heated and evaporated by the flue gas in the flue gas channel and discharged with the flue gas.

[0054] In this embodiment, the exhaust channel 201 and air channel 202 of the flue assembly 200 are independent of each other. The two channels can be implemented as two separate pipes, a sleeve structure, or different channels on the same main structure. The specific structural implementation is not limited here, as long as the air flowing through at least the first channel segment 2021 in the air channel 202 can exchange heat with the flue gas flowing through the exhaust channel 201. For example, the first channel segment 2021 can be adjacent to the exhaust channel 201, separated by a side wall; or the pipe forming the first channel segment 2021 can be fitted and connected to the pipe forming the exhaust channel 201, or connected by a heat-conducting component, etc. It is understood that the first channel segment 2021 can be a part of the air channel 202 or the entire air channel 202.

[0055] By installing a baffle 23 in the first channel section 2021, the airflow passing through it can be turbulent, the airflow speed can be slowed down, the heat exchange time between air and flue gas can be extended, the heating efficiency of flue gas on air can be effectively improved, the temperature difference between flue gas and air can be reduced more quickly, and the possibility of condensation can be further reduced.

[0056] In summary, in the flue assembly 200 of this utility model, the flue assembly 200 is provided with an independent exhaust channel 201 and an air channel 202. The air flowing through at least the first channel section 2021 in the air channel 202 can exchange heat with the flue gas in the exhaust channel 201. At the same time, a baffle 23 is provided in the first channel section 2021. The baffle 23 can turbulent the airflow passing through it, slow down the airflow speed, prolong the heat exchange time between the air and the flue gas, effectively improve the heating efficiency of the flue gas on the air, and accelerate the reduction of the temperature difference between the flue gas and the air.

[0057] When applied to a gas water heater 1000, when the flue gas from the main body 100 is discharged to the outside after one heat exchange, the intake cold air is heated in the flue pipe assembly 200. The intake cold air can be quickly heated to a sufficient temperature, rapidly reducing the temperature difference between the intake cold air and the flue gas, thus avoiding or significantly reducing the generation of condensate.

[0058] To further enhance air heating efficiency, please refer to [link / reference]. Figures 1 to 3 In one embodiment of this application, the turbulence-disrupting element 23 is a thermally conductive flocculent material.

[0059] Understandably, the thermally conductive flocculent material contains multiple irregular channels that allow air to pass through. Due to the irregularity of these channels, compared to a regularly arranged fin structure, the flocculent material has a better turbulence effect and is less disruptive to laminar airflow. Simultaneously, the thermally conductive flocculent material also ensures smooth airflow, improves smoke extraction, and reduces the energy consumption of the fan. The thermally conductive flocculent material can fill the first channel section 2021 completely or not.

[0060] The specific structural form of the baffle 23 is not limited; for example, it can be a filamentous structure, a mesh structure, a combination of filamentous and mesh materials, or some other flocculent material. In practical applications, the thermally conductive flocculent material can be made of corrosion-resistant, high-temperature resistant, and high-thermal-conductivity materials, such as metal flocculent materials like steel wool or metal mesh.

[0061] Please see Figures 1 to 3 In one embodiment of this application, the first channel segment 2021 surrounds the outer periphery of the smoke exhaust channel 201.

[0062] This design increases the heat exchange area between the air in the first channel section 2021 and the flue gas in the exhaust channel 201, and extends the heat exchange path, further accelerating the air temperature rise, reducing the temperature difference between the air and the flue gas, and avoiding or significantly reducing the generation of condensate.

[0063] In practical applications, the first channel segment 2021 can be sleeved on the outer periphery of the smoke exhaust channel 201 to form a sleeve structure; or, the first channel segment 2021 can also be a channel that is independent of the smoke exhaust channel 201 and is arranged around the outer periphery of the smoke exhaust channel 201.

[0064] In this embodiment, the baffle 23 may be arranged around the outer periphery of the smoke exhaust channel 201 or may not be arranged around the outer periphery of the smoke exhaust channel 201.

[0065] Please see Figures 1 to 3 In one embodiment of this application, the air passage 202 further includes a second passage 2022 and a third passage 2023 respectively disposed on the upstream side of the airflow and the downstream side of the airflow of the first passage 2021. The second passage 2022 is provided with an air inlet 204, and the third passage 2023 is provided with an air outlet 205. The second passage 2022 and / or the third passage 2023 surround the outer periphery of the smoke exhaust passage 201.

[0066] This design allows the incoming cold air to enter through the air inlet, pass through the second channel section 2022, the first channel section 2021, and the third channel section 2023 in sequence, exchange heat with the exhaust channel 201, and then enter the main body 100 of the equipment through the air outlet 205 and the air inlet 101. This extends the heat exchange path between the air and the flue gas and improves the heating efficiency of the air.

[0067] Understandably, in this embodiment, the second channel section 2022 and the third channel section 2023 may or may not have a baffle 23. In practical applications, considering the smoothness of smoke exhaust and the air intake resistance, the second channel section 2022 and the third channel section 2023 are not equipped with a baffle 23 to avoid excessive wind resistance affecting smoke exhaust. To ensure the air intake volume, it is preferable to provide multiple air intake holes 204 on the peripheral wall of the second channel section 2022 to ensure the air intake area.

[0068] Optionally, the second channel segment 2022 may be sleeved around the outer periphery of the smoke exhaust channel 201 to form a sleeve-like structure; alternatively, the second channel segment 2022 may be a channel independent of the smoke exhaust channel 201, surrounding the outer periphery of the smoke exhaust channel 201. Optionally, the third channel segment 2023 may be sleeved around the outer periphery of the smoke exhaust channel 201 to form a sleeve-like structure; alternatively, the third channel segment 2023 may be a channel independent of the smoke exhaust channel 201, surrounding the outer periphery of the smoke exhaust channel 201.

[0069] Please see Figures 2 to 5 In one embodiment of this application, the flue assembly 200 includes a first separator 24 and a second separator 25. The first separator 24 is disposed in the air channel 202 and separates the second channel segment 2022 from the first channel segment 2021. The first separator 24 is provided with a plurality of first air passages 241. The second separator 25 is disposed in the air channel 202 and separates the first channel segment 2021 from the third channel segment 2023. The second separator 25 is provided with a plurality of second air passages 251.

[0070] In this design, the first partition 24, the second partition 25, and the wall of the air passage 202 enclose a first channel segment 2021. The inner cavity of the first channel segment 2021 serves as the mounting cavity for the baffle 23, ensuring reliable installation of the baffle 23 within the first channel segment 2021 and preventing it from being blown away or falling off by the air. The first partition 24 is provided with several first air passages 241, connecting the second channel segment 2022 to the first channel segment 2021 to allow for smooth airflow. The second partition 25 is provided with several second air passages 251, connecting the first channel segment 2021 to the third channel segment 2023 to allow for smooth airflow.

[0071] Optionally, the first partition 24 can be a ring-shaped structure fitted around the outer periphery of the smoke exhaust channel 201, with a plurality of first air passages 241 distributed at intervals along the circumference and radial direction of the first partition 24 to ensure the air passage area. Similarly, the second partition 25 can be a ring-shaped structure fitted around the outer periphery of the smoke exhaust channel 201, with a plurality of second air passages 251 distributed at intervals along the circumference and radial direction of the second partition 25 to ensure the air passage area. The structures of the first partition 24 and the second partition 25 can be the same or different. Optionally, the first partition 24 and the second partition 25 can be a mesh structure or a plate structure.

[0072] In one embodiment of this application, the first air passage 241 and the second air passage 251 are offset axially in the first passage segment 2021. This design can further enhance the turbulence effect on the intake air, extend the air intake path, accelerate the air temperature rise, and avoid or significantly reduce the generation of condensate.

[0073] In some other embodiments, the first air passage 241 and the second air passage 251 may also be arranged opposite each other in the axial direction of the first passage section 2021 to ensure smooth air intake and exhaust and reduce the energy consumption of the fan 14.

[0074] In one embodiment of this application, the first separator 24 and the second separator 25 are made of metal. This design allows the first separator 24 and the second separator 25 to have high thermal conductivity, which increases the contact area with air, increases the heat exchange area, and improves the heating efficiency of the air.

[0075] Please see Figures 2 to 5 In one embodiment of this application, the smoke pipe assembly 200 includes a smoke exhaust pipe 21 and an air inlet pipe 22. The inner cavity of the smoke exhaust pipe 21 forms a smoke exhaust channel 201. The air inlet pipe 22 is sleeved on the outside of the smoke exhaust pipe 21, and the gap between the air inlet pipe 22 and the smoke exhaust pipe 21 forms an air channel 202. The baffle 23 is located between the inner wall of the air inlet pipe 22 and the outer wall of the smoke exhaust pipe 21.

[0076] This design ensures that the airflow in the exhaust duct 201 and the airflow in the air duct 202 are completely counter-current, allowing the airflow in both ducts to directly exchange heat through the wall of the exhaust pipe 21, thus improving the heat exchange efficiency between hot flue gas and cold air. Furthermore, by integrating the air duct 202 and the exhaust duct 201 into a single sleeve structure, compared to two separate pipes, this embodiment reduces the overall volume of the flue pipe assembly 200 and the overall size of the gas water heater 1000.

[0077] By setting a baffle 23 between the inner wall of the air intake pipe 22 and the outer wall of the exhaust pipe 21, the air heat exchange time is extended and the air temperature rise efficiency is improved.

[0078] Optionally, the first partition 24 is annularly sleeved on the outer wall of the exhaust pipe 21, and the first partition 24 and the exhaust pipe 21 can be fixed by interference fit or welding. The radial outer end of the first partition 24 may or may not be in contact with the inner wall of the intake pipe 22.

[0079] Optionally, the second separator 25 is annularly sleeved on the outer wall of the exhaust pipe 21, and the second separator 25 and the exhaust pipe 21 can be fixed by interference fit or welding. The radial outer end of the second separator 25 may or may not be in contact with the inner wall of the intake pipe 22.

[0080] Please see Figures 1 to 3 In one embodiment of this application, the exhaust pipe 21 and the air inlet pipe 22 are straight pipes. The exhaust pipe 21 has a front end and an end end that are separated at both axial ends, and the air inlet pipe 22 has a front end and an end end that are separated at both axial ends. The pipe assembly 200 also includes a first bend pipe 261 and a second bend pipe 262 sleeved outside the first bend pipe 261. The first bend pipe 261 is connected to the front end of the exhaust pipe 21, and the second bend pipe 262 is connected to the front end of the air inlet pipe 22.

[0081] In this design, the exhaust pipe 21 is connected to the smoke outlet 102 of the main body 100 via a first bend 261, and the air inlet pipe 22 is connected to the air inlet 101 of the main body 100 via a second bend 262. The first bend 261 and the second bend 262 can be bent according to the actual installation requirements, providing greater installation flexibility. For example, when the smoke pipe assembly 200 is installed on top of the main body 100, the first bend 261 and the second bend 262 can be set to 90-degree bends. In this case, the exhaust pipe 21 can extend horizontally or slightly inclined to the outside to smoothly discharge the smoke, and the air inlet pipe 22 can also extend horizontally or slightly inclined. Optionally, the first bend 261 and the exhaust pipe 21 are inserted with an interference fit, and the second bend 262 and the air inlet pipe 22 are inserted with an interference fit.

[0082] It should be noted that by using the flue assembly 200 of this application to heat the intake cold air, the air temperature of the intake air has already risen above the condensate dew point temperature before it flows to the front end of the intake pipe 22 (i.e., near the second bend 262). As a result, when the flue gas flows outward, either no condensate will be generated, or only a very small amount of condensate will be generated in the exhaust pipe 21 away from the first bend 261. This very small amount of condensate is far away from the main body 100 of the equipment and will not easily flow into the main body 100 of the equipment. Instead, it will be quickly heated and evaporated by the flue gas in the exhaust pipe 21 and discharged with the flue gas.

[0083] The end of the exhaust pipe 21 extends beyond the end of the inlet pipe 22. Multiple exhaust holes 203 are provided on the peripheral wall of the section of the exhaust pipe 21 extending from the inlet pipe 22, ensuring a sufficient distance between the exhaust holes 203 and the air inlet holes 204. This prevents airflow short-circuiting and avoids the re-inhalation of smoke into the main body 100 of the equipment. The multiple exhaust holes 203 are located on the peripheral wall of the exhaust pipe 21 rather than at its end, achieving both waterproofing, insect prevention, and foreign object protection, while also ensuring sufficient exhaust flow area and reducing exhaust resistance.

[0084] The intake pipe 22 has multiple air inlets 204 on its peripheral wall near its end (second channel section 2022), which ensures the heat exchange length between the air channel 202 and the flue gas channel, and ensures the heating effect of the flue gas on the air. The multiple air inlets 204 are evenly distributed around the peripheral wall of the intake pipe 22 to ensure the air intake volume and improve the uniformity of air intake, so that the air can surround the outer periphery of the exhaust pipe 21 and improve the heat exchange efficiency.

[0085] In this embodiment, the exhaust pipe 21 and the intake pipe 22 are coaxially arranged. The exhaust pipe 21 and the intake pipe 22 can be supported and fixed by the first separator 24 and the second separator 25 to ensure the spacing between the two pipes. Optionally, the exhaust pipe 21 has a diameter of 40mm and the intake pipe 22 has a diameter of 60mm. Compared with the related technology where the inner pipe diameter is 60mm and the outer pipe diameter is 100mm, the heat transfer efficiency is significantly improved. This is mainly because the smaller annular gap area between the inner and outer pipes reduces the distance for heat conduction and radiation from the inner pipe wall to the air, and also reduces the distance for heat convection in the air within the annular gap, thereby improving the heat exchange efficiency between the inner pipe wall and the air.

[0086] To achieve the above objectives, this utility model also proposes a gas water heater 1000, such as... Figures 6 to 8 The gas water heater 1000 includes a main body 100 and a flue assembly 200. The specific structure of the flue assembly 200 is as described in the above embodiments. Since the gas water heater 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0087] The equipment body 100 is provided with an air inlet 101 and a smoke outlet 102. The smoke pipe assembly 200 is installed on the equipment body 100. The smoke exhaust channel 201 is connected to the smoke outlet 102, and the air channel 202 is connected to the air inlet 101.

[0088] Understandably, after undergoing heat exchange once inside the main body 100 of the gas water heater 1000, the flue gas enters the exhaust channel 201 through the flue outlet 102. When it is discharged outward through the exhaust channel 201, it will undergo secondary heat exchange with the cold air flowing through the air channel 202 to heat the intake air, thereby significantly increasing the temperature rise of the intake air, rapidly reducing the temperature difference between the intake air and the flue gas, and avoiding or significantly reducing the generation of condensate.

[0089] Optionally, the flow-through cross-section of the air inlet 101 is annularly disposed on the outer periphery of the smoke outlet 102; the flow-through cross-section of the outlet end of the air passage 202 is disposed on the outer periphery of the inlet end of the smoke exhaust passage 201, the inner annular wall of the air inlet 101 is sealed to the inner annular wall of the outlet end of the air passage 202, and the inner wall of the smoke outlet 102 is sealed to the inner wall of the smoke exhaust passage 201.

[0090] Please see Figure 7 and Figure 8 In one embodiment of this application, the main body 100 of the equipment includes a casing 11, a combustion heat exchange chamber 12, and a fan 14. The top wall of the casing 11 is provided with an air inlet 101 and a smoke outlet 102, and the smoke pipe assembly 200 is installed on the top of the casing 11. The combustion heat exchange chamber 12 is located inside the casing 11. The bottom of the combustion heat exchange chamber 12 is provided with an air inlet 103, and the top is provided with a smoke outlet 104. The air inlet 103 is used to communicate with the air inlet 101, and the smoke outlet 104 is used to communicate with the smoke outlet 102. The main heat exchanger 13 is located inside the combustion heat exchange chamber 12 and has a water passage. The fan 14 is located inside the casing 11. The air outlet of the fan 14 is connected to the air inlet 103, or the air inlet of the fan 14 is connected to the smoke outlet 104.

[0091] In this embodiment, external air flows through the air passage 202 of the flue assembly 200, enters the interior of the housing 11 through the air inlet 101, or directly enters the combustion heat exchange chamber 12 through the air inlet 103, where it combusts with the fuel gas entering the combustion heat exchange chamber 12 to generate high-temperature flue gas. The high-temperature flue gas generated in the combustion heat exchange chamber 12 exchanges heat with the cold water flowing inside the main heat exchanger 13, then flows out of the combustion heat exchange chamber 12 through the flue outlet 104, and then enters the exhaust passage 201 of the flue assembly 200 through the exhaust port 102. The flue gas flowing through the exhaust passage 201 heats the air flowing through the air passage 202, and the heated flue gas is discharged outwards. Furthermore, by installing the flue assembly 200 on the top of the housing 11 in this embodiment, it facilitates the flow of flue gas and reduces the overall horizontal and vertical dimensions of the main body 100, thus reducing the installation space required.

[0092] Optionally, please refer to Figure 7The fan 14 is located below the combustion heat exchange chamber 12, and the air outlet of the fan 14 is connected to the air inlet 103. At this time, the gas water heater 1000 is a forced-blowing type, and the fan 14 can drive hot air from the air inlet 103 into the combustion heat exchange chamber 12 to mix with and burn the gas. In this embodiment, the components in the gas water heater 1000 can be arranged from bottom to top as follows: fan 14, combustion heat exchange chamber 12 (burner, main heat exchanger 13), and flue assembly 200.

[0093] Optionally, please refer to Figure 8 The fan 14 is located above the combustion heat exchange chamber 12. The air inlet of the fan 14 is connected to the flue gas outlet 104, and the air outlet of the fan 14 is connected to the flue gas outlet 102. At this time, the gas water heater 1000 is a forced-draft type, and the fan 14 can drive hot air to be drawn from the air inlet 103 into the combustion heat exchange chamber 12 to mix with and burn the gas. In this embodiment, the components in the gas water heater 1000 can be arranged from bottom to top as follows: combustion heat exchange chamber 12 (burner, main heat exchanger 13), fan 14, and flue pipe assembly 200.

[0094] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A flue assembly, characterized in that, The smoke pipe assembly is provided with independent smoke exhaust channels and air channels; The air passage has at least a first passage section, through which the air flowing through the first passage section can exchange heat with the flue gas in the exhaust passage; The first channel section is equipped with a flow-disrupting element.

2. The smoke pipe assembly as described in claim 1, characterized in that, The first channel segment is located around the periphery of the smoke exhaust channel.

3. The smoke pipe assembly as described in claim 2, characterized in that, The air passage further includes a second passage section located upstream of the airflow in the first passage section and a third passage section located downstream of the airflow. The second passage section is provided with an air inlet, and the third passage section is provided with an air outlet. The second channel segment and / or the third channel segment surround the outer periphery of the smoke exhaust channel.

4. The smoke pipe assembly as described in claim 3, characterized in that, The flue assembly includes: A first separator, disposed within the air passage, separates the second passage segment from the first passage segment; the first separator is provided with a plurality of first air passages; and A second separator is disposed within the air passage to separate the first passage segment from the third passage segment. The second separator is provided with a plurality of second air passages.

5. The flue assembly as described in claim 4, characterized in that, The first air passage and the second air passage are offset in the axial direction of the first passage segment; And / or, the first separator and the second separator are mesh structures; And / or, the first separator and the second separator are metal parts.

6. The flue assembly as described in any one of claims 1 to 5, characterized in that, The turbulence-disrupting component is a thermally conductive flocculent material.

7. The flue assembly as described in claim 6, characterized in that, The turbulence-disrupting element fills the first channel segment.

8. The flue assembly as described in claim 6, characterized in that, The flue assembly includes: Smoke exhaust pipe, the inner cavity of which forms the smoke exhaust channel; and An air intake pipe is sleeved on the outside of the exhaust pipe, and the gap between the air intake pipe and the exhaust pipe forms the air passage; The baffle is located between the inner wall of the air intake pipe and the outer wall of the exhaust pipe.

9. A gas water heater, characterized in that, Includes the main body of the device and the flue assembly as described in any one of claims 1 to 8; The main body of the device is provided with an air inlet and a smoke outlet. The smoke pipe assembly is disposed on the main body of the device. The smoke exhaust channel is connected to the smoke outlet, and the air channel is connected to the air inlet.

10. The gas water heater as described in claim 9, characterized in that, The main body of the equipment includes: The housing has an air inlet and a smoke outlet on its top wall, and the smoke pipe assembly is installed on the top of the housing. A combustion heat exchange chamber is disposed within the casing, and the combustion heat exchange chamber is provided with an air inlet and a smoke outlet; the air inlet is used to communicate with the air intake port; and A fan is provided below the combustion heat exchange chamber, and the smoke outlet is connected to the smoke outlet via a pipe; or, the fan is provided above the combustion heat exchange chamber, with the air inlet of the fan connected to the smoke outlet and the air outlet of the fan connected to the smoke outlet.

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