Smoke tube assembly and gas water heating equipment

Abstract

The utility model belongs to the technical field of heat supply, and particularly discloses a smoke tube assembly and gas water heating equipment. The smoke pipe assembly comprises an outer air pipe, an inner smoke pipe and turbulent flow strips. The outer air pipe is provided with an outer straight pipe section extending straightly; the inner smoke pipe is arranged in the outer air pipe, an air inlet channel is formed between the outer side wall of the inner smoke pipe and the inner side wall of the outer air pipe, the inner smoke pipe comprises a smoke inlet header pipe and at least two smoke branch pipes arranged in the outer straight pipe section at intervals, and the smoke branch pipes extend in the length direction of the outer straight pipe section. The smoke inlet ends of all the smoke branch pipes are connected with the smoke outlet end of the smoke inlet header pipe; the turbulent flow strips and the flue gas branch pipes are arranged in a one-to-one correspondence mode, and the turbulent flow strips are inserted into the flue gas branch pipes so as to disturb flue gas in the flue gas branch pipes. The gas water heating equipment comprises the smoke pipe assembly. According to the smoke pipe assembly and the gas water heating equipment, the heat exchange efficiency of smoke and air in the air inlet channel in the smoke exhaust process can be improved, the heat loss of the gas water heating equipment is reduced, energy is saved, and the energy efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heating, in particular to a smoke pipe assembly and a gas water heater. Background Art

[0002] Gas water heaters, gas wall-mounted boilers and other gas water heating equipment usually use high-temperature flue gas generated by gas combustion to heat water flowing through a heat exchanger. In order to discharge the flue gas after heat exchange to the external environment, the gas water heating equipment is usually provided with a flue gas exhaust pipe.

[0003] The exhaust pipe of some existing gas water heaters is a balanced exhaust pipe composed of an inner and outer pipe, which includes an outer pipe and an inner pipe arranged inside the outer pipe at intervals. The flow channel inside the inner pipe forms a flue gas flow channel, and the flow channel between the inner pipe and the outer pipe forms an air intake channel. When the flue gas is discharged to the outside through the flue gas flow channel, the external air enters the hot gas water heater through the air intake channel under the action of negative pressure, thereby achieving combustion and air replenishment while achieving flue gas discharge. At the same time, when the air flows in the air intake channel, it exchanges heat with the flue gas in the flue gas flow channel, thereby achieving preheating of the air entering the gas water heater.

[0004] However, the existing smoke duct has a low heat exchange efficiency between air and smoke due to the fast smoke flow rate and air flow rate, which makes it impossible for the air to effectively absorb the heat of the smoke, resulting in difficulty in effectively utilizing the waste heat of the smoke, which is not conducive to improving the energy efficiency of gas water heaters. Utility Model Content

[0005] One of the technical problems solved by the utility model is to provide a smoke pipe assembly, which can effectively solve the problem of low heat exchange efficiency between smoke and air in the existing smoke pipe, and improve the heat exchange efficiency between smoke and air.

[0006] The second technical problem solved by the utility model is to provide a gas water heater, which can effectively solve the problem that the flue gas waste heat in the existing gas water heater cannot be effectively absorbed and utilized by the air, improve the utilization rate of the flue gas waste heat, and reduce the energy consumption of the gas equipment.

[0007] The first technical problem mentioned above is solved by the following technical solution:

[0008] A smoke pipe assembly, comprising:

[0009] An external air duct, wherein the external air duct has an external straight pipe section extending straightly;

[0010] An inner smoke pipe is arranged in the outer air pipe, and an air inlet passage is formed between the outer side wall of the inner smoke pipe and the inner side wall of the outer air pipe, the inner smoke pipe comprises a smoke inlet main pipe and at least two smoke branch pipes arranged at intervals in the outer straight pipe section, the smoke branch pipes extend along the length direction of the outer straight pipe section, and the smoke inlet ends of all the smoke branch pipes are connected to the smoke outlet end of the smoke inlet main pipe;

[0011] The spoiler strips are arranged one by one corresponding to the smoke branch pipes, and the spoiler strips are inserted into the smoke branch pipes to turbulent the smoke in the smoke branch pipes.

[0012] The smoke pipe assembly described in the utility model has the following beneficial effects compared with the background technology: by arranging at least two smoke branch pipes inside the outer straight pipe section, the smoke entering from the smoke inlet main pipe can be diverted through multiple smoke branch pipes and the total external surface area of ​​the inner smoke pipe is increased, thereby increasing the heat exchange area between the air in the air inlet channel and the smoke branch pipe, improving the heat exchange efficiency between the air and the smoke, and increasing the waste heat utilization rate of the smoke; at the same time, since the spoiler strips are arranged in the smoke branch pipes, the spoiler strips can disturb the flow of the smoke, extend the flow path and flow time of the smoke in the smoke branch pipes, increase the probability of collision between the smoke and the inside of the smoke branch pipes, thereby increasing the heat transferred from the smoke to the wall of the smoke branch pipes, thereby increasing the heat transferred from the smoke branch pipes to the air in the air inlet channel, and further improving the heat exchange efficiency between the air and the smoke.

[0013] In one embodiment, the smoke branch pipe and the smoke inlet main pipe are processed separately, and a connecting rib is connected between the outer wall of each smoke branch pipe and the inner wall of the outer straight pipe section;

[0014] And / or, at least some of the smoke branch pipes are connected with connecting ribs.

[0015] In one embodiment, the smoke branch pipe, the connecting rib and the outer straight pipe section are integrally formed;

[0016] And / or, the smoke branch pipe is detachably connected to the smoke inlet main pipe;

[0017] And / or, the external air duct includes an external curved pipe section connected to the external straight pipe section, the smoke inlet main pipe is inserted into the external curved pipe section at intervals, and the external curved pipe section is detachably connected to the external straight pipe section.

[0018] In one embodiment, the inner smoke duct also includes a diverter joint, which includes a main pipe part and multiple diverter pipe parts, the first end of the main pipe part is coaxially connected to the smoke outlet end of the smoke inlet main pipe and the second end of the main pipe part is closed, the multiple diverter pipe parts correspond one-to-one to the multiple smoke branch pipes, and the first end of each of the diverter pipe parts is connected to the second end of the main pipe part, and the second end of each of the diverter pipe parts is coaxially connected to the corresponding smoke branch pipe.

[0019] In one embodiment, the plurality of branch pipe portions are evenly spaced along the circumference of the main pipe portion, and in a projection plane perpendicular to the first direction, an orthographic projection of the branch pipe portion in the projection plane is outside the range of an orthographic projection of the main pipe portion in the projection plane.

[0020] In one embodiment, the outer peripheral wall of the main pipe portion has a first side wall and a second side wall which are staggered along the circumference of the main pipe portion and connected end to end, the first side wall is arranged in a one-to-one correspondence with the diversion pipe portion and is connected, and the first side wall is a conical surface, the large end of the first side wall is connected to the smoke inlet end of the diversion pipe portion, and the second side wall and the first side wall and the second end face of the main pipe portion are all smoothly transitionally connected.

[0021] In one embodiment, the inner smoke pipe further includes a smoke exhaust joint, the smoke exhaust joint includes a smoke exhaust pipe portion and a plurality of manifold portions, the manifold portions are arranged one-to-one with the smoke branch pipes and are coaxially connected, one end of all the manifold portions away from the smoke branch pipes is connected to the first end of the smoke exhaust pipe portion, and the second end of the smoke exhaust pipe portion forms a smoke exhaust port of the inner smoke pipe;

[0022] And / or, the external air duct also includes an air inlet pipe, the air inlet pipe is coaxially connected to one end of the external straight pipe section away from the smoke inlet main pipe, and an air inlet port is opened on the side wall of the air inlet pipe.

[0023] In one embodiment, a support portion is connected between the air intake pipe and the smoke exhaust pipe portion, and the air intake pipe, the smoke exhaust joint and the support portion are connected as a whole.

[0024] In one embodiment, the outer peripheral wall of the first end of the smoke exhaust pipe portion includes a third side wall and a fourth side wall which are staggered along the circumference of the smoke exhaust pipe portion and connected end to end in sequence, the third side wall is arranged in a one-to-one correspondence with the manifold portion, the third side wall is a conical surface, the large end of the third side wall is connected to the smoke outlet end of the manifold portion, and the fourth side wall and the first end face of the smoke exhaust pipe portion and the third side wall and the fourth side wall are all smoothly transitioned.

[0025] The above second technical problem is solved by the following technical solution:

[0026] A gas water heater comprises the smoke pipe assembly as described above.

[0027] Compared with the background technology, the gas water heater described in the utility model has the following beneficial effects: by adopting the above-mentioned smoke pipe assembly, the thermal efficiency of the gas water heater can be increased, energy consumption can be saved, and costs can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A front view of a smoke tube assembly provided by an embodiment of the utility model;

[0029] Figure 2 A schematic diagram of the disassembled structure of the smoke tube assembly provided in an embodiment of the utility model;

[0030] Figure 3 A cross-sectional schematic diagram of a smoke tube assembly provided in an embodiment of the utility model;

[0031] Figure 4 A longitudinal cross-sectional schematic diagram of a straight smoke pipe provided in an embodiment of the utility model;

[0032] Figure 5 A cross-sectional view of a smoke tube assembly provided in an embodiment of the utility model;

[0033] Figure 6 for Figure 5 A partial enlarged view of point I in the middle;

[0034] Figure 7 An axonometric view of a flow divider provided in an embodiment of the utility model;

[0035] Figure 8 A side view of a flow splitter provided in an embodiment of the utility model;

[0036] Fig. 9 A schematic diagram of the structure of the outer end connector provided by an embodiment of the utility model at a certain viewing angle;

[0037] Fig.10 A schematic structural diagram of the outer end connector provided by an embodiment of the utility model from another perspective;

[0038] Fig.11 A schematic diagram of an outer end connector provided in an embodiment of the utility model in a cross section;

[0039] Fig.12 A schematic diagram of an outer end connector provided in an embodiment of the utility model under another cross-section.

[0040] Description of labels:

[0041] 1. Outer bend pipe section; 2. Straight smoke pipe; 21. Outer straight pipe section; 22. Smoke branch pipe; 221. Smoke channel; 23. Connecting ribs; 24. Air intake channel; 3. Smoke intake main pipe; 31. Main pipe section; 32. Plug-in pipe section; 4. Diverter joint; 41. Main pipe section; 411. Cylindrical pipe section; 412. Transition section; 4121. First side wall; 4122. Second side wall; 4123. First arc transition surface; 42. Diverter pipe section; 5. Outer end joint; 51. Smoke exhaust joint; 511. Smoke exhaust pipe section; 5111. Smoke exhaust port; 5112. Third side wall; 5113. Fourth side wall; 5114. Second arc transition surface; 512. Converging pipe section; 52. Air intake pipe; 521. Air intake port; 53. Support section; 54. Rain shield; 6. Spoiler strip. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] This embodiment provides a smoke pipe assembly, which can be applied to a gas water heater to achieve smoke exhaust and air intake at the same time, improve the heat exchange efficiency between smoke and air, and reduce the processing cost of the smoke pipe assembly. The gas water heater can be, but is not limited to, a gas water heater, a gas wall-mounted boiler, etc.

[0047] like Figure 1 and Figure 2 As shown, in this embodiment, the smoke duct assembly includes an outer air duct, an inner smoke duct and a spoiler strip 6. The inner smoke duct is arranged inside the outer air duct, and an air inlet channel 24 is formed between the outer side wall of the inner smoke duct and the inner side wall of the outer smoke duct; the outer air duct includes an outer straight pipe section 21 extending along a first direction, the inner smoke duct includes a smoke inlet main pipe 3 and at least two smoke branch pipes 22, all smoke branch pipes 22 are arranged in the outer straight pipe section 21 at intervals and extend along the first direction (i.e., the length direction of the outer straight pipe section 21), and the inner cavity of each smoke branch pipe 22 forms a smoke channel 221, and the smoke inlet ends of all smoke branch pipes 22 are connected to the smoke outlet end of the smoke inlet main pipe 3; the spoiler strip 6 is arranged one-to-one with the smoke branch pipe 22, and the spoiler strip 6 is inserted into the corresponding smoke branch pipe 22 to tamper the smoke flow in the smoke branch pipe 22.

[0048] The smoke pipe assembly provided in the present embodiment arranges at least two smoke branch pipes 22 inside the outer straight pipe section 21, so that the smoke entering from the smoke inlet main pipe 3 can be diverted through multiple smoke branch pipes 22 and the total external surface area of ​​the inner smoke pipe is increased, thereby increasing the heat exchange area between the air in the air inlet channel 24 and the smoke branch pipe 22, improving the heat exchange efficiency between the air and the smoke, and increasing the waste heat utilization rate of the smoke; at the same time, since the spoiler strip 6 is arranged in the smoke branch pipe 22, the spoiler strip 6 can disturb the flow of the smoke, extend the flow path and flow time of the smoke in the smoke branch pipe 22, increase the probability of the smoke colliding with the inside of the smoke branch pipe 22, thereby increasing the heat transferred from the smoke to the wall of the smoke branch pipe 22, and then increasing the heat transferred from the smoke branch pipe 22 to the air in the air inlet channel 24, further improving the heat exchange efficiency between the air and the smoke.

[0049] In one embodiment, the external air duct includes an external curved pipe section 1, one end of the external curved pipe section 1 is coaxially connected to the external straight pipe section 21, and the second end of the external curved pipe section 1 is used to connect to the body of the gas water heater. The provision of the external curved pipe section 1 is conducive to the installation of the external air duct on the gas water heater. The smoke inlet main pipe 3 is inserted at intervals inside the external curved pipe section 1, and the smoke inlet main pipe 3 is a curved pipe structure adapted to the external curved pipe section 1. The smoke inlet end of the smoke inlet main pipe 3 extends outward from the external air duct, so as to facilitate the connection of the smoke inlet end of the smoke inlet main pipe 3 with the smoke collecting hood of the gas water heater.

[0050] like Figure 2 and Figure 3As shown, in one embodiment, the spoiler strip 6 is at least partially in a spiral structure extending along the first direction, so as to enhance the spoiler effect on the smoke in the branch pipe portion 42 while reducing the influence of the setting of the spoiler strip 6 on the smoke flow resistance. Both ends of the spoiler strip 6 are in a plate-like structure parallel to the first direction, so as to reduce the resistance of the smoke flowing into and out of the smoke branch pipe 22, and ensure the smoothness of the smoke flow.

[0051] In other embodiments, the spoiler strip 6 may also be a straight strip structure extending along the first direction, and the two opposite sides of the spoiler strip 6 may be provided with protrusions and / or grooves to achieve spoiler. In other embodiments, the spoiler strip 6 may also be a wavy or other concave-convex matching strip structure.

[0052] In one embodiment, the spoiler strip 6 is a spiral strip structure as a whole, which is formed by winding a metal strip. The spiral structure of the spoiler strip 6 is gradually encrypted from the two ends to the middle, that is, the pitch of the spiral structure is gradually reduced from the two ends to the middle, so as to facilitate the processing of the spoiler strip 6, while ensuring that the two ends of the spoiler strip 6 are in a flat structure, the density of the spiral structure in the middle of the spoiler strip 6 is increased to enhance the effect of flue gas disturbance. In another embodiment, the spoiler strip 6 can be a spiral structure with equal pitch only in the middle section, and the two end parts are flat structures.

[0053] The width of the spoiler strip 6 is preferably equal to the inner diameter of the smoke branch pipe 22, so that the spoiler strip 6 can be stably inserted into the smoke branch pipe 22, avoiding the spoiler strip 6 from shaking in the smoke branch pipe 22, and reducing the noise during smoke emission.

[0054] In one embodiment, a plurality of smoke branch pipes 22 are evenly spaced along the circumference of the outer straight pipe section 21 to improve the uniformity of smoke flow distribution and air flow, improve the heat exchange effect, and reduce the difficulty of processing the smoke pipe assembly. In other embodiments, a smoke branch pipe 22 may be arranged at the center of the outer straight pipe section 21, and the remaining smoke branch pipes 22 may be evenly spaced around the central smoke branch pipe 22.

[0055] In one embodiment, the number of the flue gas branch pipes 22 is preferably 3 to 6, which can be 3, 4, 5 or 6, so as to ensure the heat exchange effect while avoiding a single flue gas branch pipe 22 being too small to increase the flue gas flow resistance and increase the difficulty of setting the spoiler strip 6 in the flue gas branch pipe 22.

[0056] like Figure 3 and Figure 4As shown, in order to improve the stability of the smoke branch pipe 22 in the outer straight pipe section 21, in one embodiment, a connecting rib 23 is connected between the outer side wall of the smoke branch pipe 22 and the inner side wall of the outer straight pipe section 21, so that the smoke branch pipe 22 and the outer straight pipe section 21 are connected to form an integral structure, thereby ensuring the accuracy of the position of the smoke branch pipe 22 and the outer straight pipe section 21, and avoiding the relative shaking of the smoke branch pipe 22 and the outer straight pipe section 21. The connecting rib 23 extends along the first direction and preferably extends to both ends of the length direction of the smoke branch pipe 22 to enhance the connection stability and reliability between the smoke branch pipe 22 and the outer straight pipe section 21.

[0057] In order to further ensure the stability of the arrangement of the smoke branch pipes 22 , connecting ribs 23 are connected between at least some of the smoke branch pipes 22 , thereby ensuring the relative position stability and reliability between the multiple smoke branch pipes 22 .

[0058] In one embodiment, a connecting rib 23 is connected between two smoke branch pipes 22 arranged opposite to each other along the radial direction of the outer straight pipe section 21, so as to further improve the stability and reliability of the smoke branch pipe 22 in the outer straight pipe section 21. Exemplarily, four smoke branch pipes 22 are evenly spaced along the circumference of the outer straight pipe section 21, and a connecting rib 23 is connected between two smoke branch pipes 22 arranged opposite to each other, and the two connecting ribs 23 form a cross structure. The connecting ribs 23 on both sides of the same smoke branch pipe 22 are preferably arranged opposite to each other, so as to facilitate the processing of the connecting rib 23, and better ensure the force balance of the smoke branch pipe 22, and ensure the structural strength and rigidity of the smoke branch pipe 22.

[0059] In one embodiment, the outer straight pipe section 21, the diverter pipe portion 42 and the connecting rib 23 are integrally formed to form the straight smoke pipe 2, so as to reduce the difficulty of processing the diverter pipe portion 42, improve the overall structural strength and rigidity of the straight smoke pipe 2, and ensure the position accuracy between the outer straight pipe section 21 and the diverter pipe portion 42. The straight smoke pipe 2 is preferably formed by extrusion of an aluminum profile, which further reduces the difficulty of processing the straight smoke pipe 2. In another embodiment, the smoke branch pipe 22 can be provided separately from the outer straight pipe section 21.

[0060] like Figure 5 and Figure 6 As shown, in order to improve the convenience of disassembly and assembly of the flue gas assembly, in one embodiment, the outer curved pipe section 1 and the outer straight pipe section 21 are detachably connected to facilitate the cleaning, maintenance and replacement of the outer curved pipe section 1 and the outer straight pipe section 21, and improve the convenience of assembly of the flue gas assembly. In other embodiments, the outer curved pipe section 1 can also be welded to the outer straight pipe section 21.

[0061] In order to improve the connection convenience between the outer curved pipe section 1 and the outer straight pipe section 21, the end of the outer curved pipe section 1 is expanded outward to form a mounting pipe portion, and the end of the outer straight pipe section 21 is inserted into the mounting pipe portion. In other embodiments, the end of the outer curved pipe section 1 can also be sealed and inserted into one end of the outer straight pipe section 21.

[0062] In one embodiment, the smoke branch pipe 22 is detachably connected to the smoke main pipe 3, so as to facilitate the replacement of the smoke branch pipe 22 and the smoke main pipe 3. In other embodiments, the smoke branch pipe 22 and the smoke main pipe 3 can also be fixedly connected.

[0063] like Figures 6 to 8 As shown, in order to improve the connection convenience between the smoke inlet main pipe 3 and the smoke branch pipe 22, in one embodiment, the inner smoke pipe further includes a diverter joint 4, the first end of the diverter joint 4 is a round tube structure and is connected to the smoke outlet end of the smoke inlet main pipe 3, and the second end of the diverter joint 4 has a plurality of diverter ports, and the diverter ports are arranged one-to-one with the smoke branch pipes 22, and the smoke branch pipes 22 are connected to the corresponding diverter ports. By providing the diverter joint 4, the smoke inlet main pipe 3, the diverter joint 4 and the smoke branch pipe 22 can be processed separately, reducing the processing difficulty of the diverter joint 4, the smoke branch pipe 22 and the smoke inlet main pipe 3, and improving the processing convenience of the inner smoke pipe.

[0064] In one embodiment, the shunt joint 4 is detachably connected to both the main smoke inlet pipe 3 and the smoke branch pipe 22, so as to improve the convenience of disassembly and assembly of the shunt joint 4 and also facilitate the replacement of the shunt joint 4. In other embodiments, the shunt joint 4 can be welded to the main smoke inlet pipe 3 and / or the smoke branch pipe 22.

[0065] The diverter joint 4 includes a main pipe part 41 and a plurality of diverter pipe parts 42. The first end of the main pipe part 41 is coaxially connected to the smoke outlet end of the smoke inlet main pipe 3 and the second end is closed. The plurality of diverter pipe parts 42 correspond to the plurality of smoke branch pipes 22 one by one, and the first end of each diverter pipe part 42 is connected to the second end of the main pipe part 41, and the second end of each diverter pipe part 42 is coaxially connected to the corresponding smoke branch pipe 22. That is, the second end port of each diverter main pipe forms a diverter port. By setting the main pipe part 41, it is convenient to realize the connection between the diverter joint 4 and the smoke inlet main pipe 3. By setting the diverter pipe part 42, it is convenient to realize the connection between the diverter joint 4 and the plurality of smoke branch pipes 22, thereby improving the assembly efficiency of the smoke pipe assembly.

[0066] In one embodiment, the smoke inlet main pipe 3 is sealed and inserted with the main pipe part 41 to improve the convenience of connecting the smoke inlet main pipe 3 and the main pipe part 41. Specifically, the smoke outlet end of the smoke inlet main pipe 3 is provided with a plug-in pipe part 32, the outer diameter of the plug-in pipe part 32 is smaller than the outer diameter of the main pipe part 31 of the smoke inlet main pipe 3, and the plug-in pipe part 32 is inserted in the main pipe part 41. This arrangement enables the step formed between the plug-in pipe part 32 and the main pipe part 31 to limit the depth of the smoke inlet main pipe 3 inserted into the main pipe part 41, thereby improving the assembly accuracy of the two; at the same time, it is conducive to ensuring that the outer diameter of the smoke inlet main pipe 3 is the same as the outer diameter of the main pipe part 41, so as to improve the smoothness of the flow of air in the air intake channel 24.

[0067] In a projection plane perpendicular to the first direction, the orthographic projection of the diverter pipe portion 42 in the projection plane is located within the range of the orthographic projection of the main pipe portion 41 in the projection plane, thereby increasing the distance between the central axis of the diverter pipe portion 42 and the central axis of the main pipe portion 41, and then increasing the distance between two adjacent diverter pipe portions 42 on the basis of keeping the pipe diameter of the diverter pipe portion 42 unchanged, thereby increasing the distance between the flue gas branch pipes 22, so that the air in the air intake channel 24 can fully contact the flue gas branch pipes 22, thereby improving the heat exchange efficiency.

[0068] In order to reduce the resistance of smoke and air flow, in one embodiment, the outer peripheral wall of the main pipe part 41 has a first side wall 4121 and a second side wall 4122 which are staggered and connected end to end along the circumference of the main pipe part 41, the first side wall 4121 and the diverter pipe part 42 are arranged one by one and connected, and the second side wall 4122 and the first side wall 4121 and the second side wall 4122 and the second end face of the main pipe part 41 are smoothly transitioned. The shape of the diverter joint 4 can be made smoother, the resistance of smoke flowing from the main pipe part 41 to the diverter pipe part 42 can be reduced, and the flow resistance of air in the air inlet channel 24 can be reduced, thereby reducing the smoke exhaust resistance and air intake resistance of the smoke pipe assembly, and improving the smoothness of smoke exhaust and air intake. Furthermore, the second side wall 4122 and the second end face of the main pipe part 41 are smoothly transitioned by the first arc transition surface 4123.

[0069] The main pipe part 41 includes a cylindrical pipe part 411 and a transition part 412 which are coaxially connected. The cylindrical pipe part 411 is connected to the smoke inlet main pipe 3. The end of the transition part 412 away from the cylindrical pipe part 411 is closed, and the diverter pipe part 42 is connected to the transition part 412. The outer peripheral side wall of the transition part 412 includes the first side wall 4121 and the second side wall 4122. The first side wall 4121 is connected between the smoke outlet end of the cylindrical pipe part 411 and the smoke inlet end of the diverter pipe part 42, and the first side wall 4121 is a conical surface structure; the second side wall 4122 is connected to the end face of the transition part 412 in a smooth transition.

[0070] like Figure 5 , Figures 9 to 12As shown, in order to further improve the convenience of smoke exhaust of the smoke pipe assembly, in one embodiment, the smoke pipe assembly also includes a smoke exhaust joint 51, a first end of the smoke exhaust joint 51 is provided with a plurality of confluence ports, a second end of the smoke exhaust joint 51 is provided with a smoke exhaust port 5111, a plurality of confluence ports are arranged one by one with a plurality of smoke branch pipes 22 and are connected, all confluence ports are sealed and connected with the smoke exhaust port 5111, and the smoke exhaust port 5111 is located on the outside of the external air duct. The setting of the smoke exhaust joint 51 allows the smoke flowing out of the smoke branch pipe 22 to converge into the inside of the smoke exhaust joint 51 through a plurality of confluence ports and then be discharged through the smoke exhaust port 5111, thereby allowing the smoke pipe assembly to have only one smoke exhaust port 5111, which is conducive to setting the shape and related structures of the smoke exhaust port 5111. In other embodiments, the smoke branch pipe 22 may directly extend out of the external air duct and the end of each smoke branch pipe 22 may form a smoke exhaust port 5111.

[0071] The smoke exhaust joint 51 includes a smoke exhaust pipe part 511 and a plurality of manifold parts 512. The first end of the smoke exhaust pipe part 511 forms a smoke exhaust port 5111. The second end of the smoke exhaust pipe part 511 is closed. The plurality of manifold parts 512 are arranged one-to-one with the plurality of smoke branch pipes 22. The first end of the manifold part 512 is connected to the second end of the smoke exhaust pipe part 511. The second end of the manifold part 512 extends in a direction away from the smoke exhaust pipe part 511, and the second end of the manifold part 512 forms a manifold port. The arrangement of the smoke exhaust joint 51 is conducive to the connection between the smoke exhaust joint 51 and the smoke branch pipe 22.

[0072] In one embodiment, in a projection plane perpendicular to the first direction, a projection portion of the manifold portion 512 in the projection plane is located outside the projection range of the smoke exhaust pipe portion 511 in the projection plane, thereby making the diameter of the inscribed circle formed by the multiple manifold portions 512 larger than the outer diameter of the smoke exhaust pipe portion 511, so as to reduce the diameter of the smoke exhaust pipe portion 511 while ensuring sufficient spacing between adjacent smoke branch pipes 22, thereby increasing the spacing between the smoke exhaust pipe portion 511 and the external air duct, thereby improving the smoothness of air entering the air intake passage 24.

[0073] The outer peripheral wall of the first end of the smoke exhaust pipe part 511 includes a third side wall 5112 and a fourth side wall 5113 which are staggered along the circumference of the smoke exhaust pipe part 511 and connected end to end in sequence. The third side wall 5112 is arranged in a one-to-one correspondence with the manifold part 512 and is connected. The third side wall 5112 is a conical surface, the large end of the conical surface is connected to the manifold part 512, and the small end of the conical surface is connected to the cylindrical surface of the smoke exhaust pipe part 511. There is a smooth transition connection between the fourth side wall 5113 and the first end face of the smoke exhaust pipe part 511, and between the third side wall 5112 and the fourth side wall 5113. Thereby, the wall surface of the smoke exhaust joint 51 can be as smooth as possible, reducing the resistance of smoke and air flowing through the smoke exhaust joint 51, and improving the smoothness of smoke exhaust and air intake. Specifically, the fourth side wall 5113 and the end face of the smoke exhaust pipe part 511 are smoothly connected by the second arc transition surface 5114.

[0074] In one embodiment, the smoke exhaust port 5111 is inclined from top to bottom toward the end face of the external air duct to reduce the probability of rainwater entering the smoke exhaust port 5111, thereby reducing the probability of rainwater entering the gas water heater through the internal smoke pipe, thereby improving the safety of the gas water heater.

[0075] In order to further reduce the probability of rainwater entering the gas water heater, in one embodiment, a rain shield 54 is protruded from the lower inner wall of the smoke exhaust pipe portion 511, and the rain shield 54 can stop the rainwater blown into the smoke exhaust pipe portion 511 from continuing to flow inward.

[0076] The outer air duct also includes an air intake pipe 52 connected to the air intake end of the outer straight pipe section 21. An air intake port 521 is provided on the outer wall of the air intake pipe 52. The inner smoke pipe extends outward from the air intake pipe 52. This arrangement enables external air to enter the air intake channel 24 from the side of the air intake pipe 52, thereby reducing the probability of smoke discharged from the inner smoke pipe entering the air intake channel 24.

[0077] In one embodiment, a plurality of air inlets 521 are provided at intervals along the circumference of the air inlet pipe 52 to increase the total opening area of ​​the air inlets 521 and improve the air intake of the air inlet passage 24. The air inlet 521 is preferably a long strip extending along the first direction to further reduce the air intake resistance of the air inlet passage 24.

[0078] Since smoke usually flows upward after flowing out of the smoke exhaust port 5111 , in order to reduce the probability of smoke entering the air intake channel 24 through the air intake port 521 , the air intake port 521 is preferably arranged on the lower side wall of the air intake pipe 52 .

[0079] In one embodiment, the air intake pipe 52 and the smoke exhaust joint 51 are connected by a support portion 53, so that the air intake pipe 52 and the smoke exhaust joint 51 are connected to form an integral outer end joint 5, thereby reducing the assembly between the straight smoke pipe 2 and the air intake pipe 52 and the smoke exhaust joint 51, and improving the assembly efficiency of the smoke pipe assembly. The air intake pipe 52, the smoke exhaust joint 51 and the support portion 53 are preferably integrally formed to reduce the processing difficulty of the outer end joint 5 and ensure the overall structural strength and rigidity of the outer end joint 5.

[0080] The support portion 53 is disposed on the outer end surface of the air intake pipe 52 to improve the convenience of the support portion 53, and the support portion 53 is located outside the air intake port 521 to prevent the support portion 53 from affecting the air entering the air intake passage 24 through the air intake pipe 52. The support portion 53 is preferably a hollow structure, so that a hollow opening for air to enter is formed at the support portion 53.

[0081] In one embodiment, the support portion 53 includes at least one connecting ring portion coaxially arranged, the innermost connecting ring portion is connected to the smoke exhaust pipe portion 511, and a connecting strip portion is connected between the innermost connecting ring portion and the tube wall of the air intake pipe 52. A plurality of connecting strip portions are arranged at circumferential intervals along the air intake pipe 52 to ensure the connection stability between the air intake pipe 52 and the smoke exhaust joint 51.

[0082] It can be understood that the above-mentioned arrangement of the support portion 53 is only an exemplary arrangement, and other structures of the support portion 53 that can realize the connection between the air intake pipe 52 and the smoke exhaust joint 51 can be applied to this embodiment.

[0083] This embodiment also provides a gas water heater, including the above-mentioned smoke pipe assembly. The remaining structure of the gas water heater can be set with reference to the prior art, which is not the focus of the present invention and will not be limited or elaborated on this time.

[0084] The gas water heater provided in this embodiment can increase the thermal efficiency of the gas water heater, save energy consumption and reduce costs by adopting the above-mentioned smoke pipe assembly.

[0085] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The specific contents of the above specific implementations only express several implementations of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A smoke pipe assembly, characterized in that: include: An external air duct, the external air duct having an external straight pipe section (21) extending straightly; An inner smoke pipe is arranged in the outer air pipe, and an air inlet passage (24) is formed between the outer wall of the inner smoke pipe and the inner wall of the outer air pipe, the inner smoke pipe comprises a smoke inlet main pipe (3) and at least two smoke branch pipes (22) arranged at intervals in the outer straight pipe section (21), the smoke branch pipes (22) extend along the length direction of the outer straight pipe section (21), and the smoke inlet ends of all the smoke branch pipes (22) are connected to the smoke outlet end of the smoke inlet main pipe (3); The spoiler strips (6) are arranged in one-to-one correspondence with the smoke branch pipes (22), and the spoiler strips (6) are inserted into the smoke branch pipes (22) to turbulent the smoke in the smoke branch pipes (22).

2. The smoke tube assembly according to claim 1, characterized in that: The smoke branch pipe (22) and the smoke inlet main pipe (3) are processed separately, and a connecting rib (23) is connected between the outer wall of each smoke branch pipe (22) and the inner wall of the outer straight pipe section (21); And / or, at least some of the smoke branch pipes (22) are connected with connecting ribs (23).

3. The smoke tube assembly according to claim 2, characterized in that: The smoke branch pipe (22), the connecting rib (23) and the outer straight pipe section (21) are integrally formed; And / or, the smoke branch pipe (22) is detachably connected to the smoke inlet main pipe (3); And / or, the external air duct comprises an external curved pipe section (1) connected to the external straight pipe section (21), the smoke inlet main pipe (3) is inserted into the external curved pipe section (1) at intervals, and the external curved pipe section (1) is detachably connected to the external straight pipe section (21).

4. The smoke tube assembly according to any one of claims 1 to 3, characterized in that: The inner smoke pipe also includes a diversion joint (4), the diversion joint (4) including a main pipe portion (41) and a plurality of diversion pipe portions (42), the first end of the main pipe portion (41) being coaxially connected to the smoke outlet end of the smoke inlet main pipe (3) and the second end of the main pipe portion (41) being closed, the plurality of diversion pipe portions (42) corresponding one-to-one to the plurality of smoke branch pipes (22), the first end of each of the diversion pipe portions (42) being connected to the second end of the main pipe portion (41), and the second end of each of the diversion pipe portions (42) being coaxially connected to the corresponding smoke branch pipe (22).

5. The smoke tube assembly according to claim 4, characterized in that: The plurality of branch pipe portions (42) are evenly spaced along the circumference of the main pipe portion (41), and in a projection plane perpendicular to the first direction, an orthographic projection of the branch pipe portion (42) in the projection plane is outside the range of an orthographic projection of the main pipe portion (41) in the projection plane.

6. The smoke tube assembly according to claim 5, characterized in that: The outer peripheral wall of the main pipe portion (41) comprises a first side wall (4121) and a second side wall (4122) which are staggeredly arranged along the circumference of the main pipe portion (41) and connected end to end; the first side wall (4121) is arranged in a one-to-one correspondence with and connected to the branch pipe portion (42); the first side wall (4121) is tapered; the large end of the first side wall (4121) is connected to the smoke inlet end of the branch pipe portion (42); the second side wall (4122) and the first side wall (4121) as well as the second side wall (4122) and the second end face of the main pipe portion (41) are connected in a smooth transition.

7. The smoke tube assembly according to any one of claims 1 to 3, characterized in that: The inner smoke pipe further comprises a smoke exhaust joint (51), the smoke exhaust joint (51) comprising a smoke exhaust pipe portion (511) and a plurality of confluence pipe portions (512), the confluence pipe portions (512) being arranged one-to-one with the smoke branch pipes (22) and being coaxially connected, the ends of all the confluence pipe portions (512) away from the smoke branch pipes (22) being connected to the first end of the smoke exhaust pipe portion (511), and the second end of the smoke exhaust pipe portion (511) forming a smoke exhaust port (5111) of the inner smoke pipe; And / or, the external air duct further comprises an air inlet pipe (52), the air inlet pipe (52) being coaxially connected to an end of the external straight pipe section (21) away from the smoke inlet main pipe (3), and an air inlet port (521) being provided on a side wall of the air inlet pipe (52).

8. The smoke tube assembly according to claim 7, characterized in that: A support portion (53) is connected between the air intake pipe (52) and the smoke exhaust pipe portion (511); the air intake pipe (52), the smoke exhaust joint (51) and the support portion (53) are connected as a whole.

9. The smoke tube assembly according to claim 7, characterized in that: The outer peripheral wall of the first end of the smoke exhaust pipe portion (511) comprises a third side wall (5112) and a fourth side wall (5113) which are staggeredly arranged along the circumference of the smoke exhaust pipe portion (511) and connected end to end in sequence, the third side wall (5112) and the manifold portion (512) are arranged in a one-to-one correspondence, the third side wall (5112) is a conical surface, the large end of the third side wall (5112) is connected to the smoke outlet end of the manifold portion (512), and the fourth side wall (5113) and the first end face of the smoke exhaust pipe portion (511) and the third side wall (5112) and the fourth side wall (5113) are all smoothly transitionally connected.

10. A gas water heater, characterized in that: Comprising a smoke tube assembly as described in any one of claims 1 to 9.

Images