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 and inner smoke pipes arranged in the outer air pipe at intervals, an air inlet channel is formed between the outer side wall of each inner smoke pipe and the inner side wall of the outer air pipe, and the outer air pipe is provided with an outer straight pipe section extending straightly. The inner smoke pipe comprises a plurality of flow dividing straight pipes arranged in the outer straight pipe section, the flow dividing straight pipes are arranged around the central axis of the outer straight pipe section at intervals and coaxially extend with the outer straight pipe section, and each flow dividing straight pipe, the inner wall of the outer straight pipe section and the adjacent flow dividing straight pipe are arranged at intervals. And the width of the shunting straight pipe in the circumferential direction of the outer straight pipe section is gradually increased in the direction far away from the central axis. According to the smoke pipe assembly and the gas water heating equipment, the smoke and air heat exchange effect can be enhanced, and meanwhile smoke exhaust and air inlet smoothness is guaranteed.

Description

Technical Field

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

[0002] Gas water heaters and gas wall-mounted boilers and other gas water heating devices 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 and preset the air entering the interior of the combustion water heating device, some gas water heating devices use a balanced flue pipe composed of an inner pipe and an outer pipe for smoke exhaust and air intake.

[0003] The prior art provides a balanced flue pipe, which includes an outer pipe and an inner pipe arranged at intervals inside the outer pipe. The inner pipe is used for discharging smoke, and the gap between the outer pipe and the inner pipe is used for external air intake. The cooling of the flue gas and the preheating of the intake air are realized through the heat exchange between the air and the flue gas at the inner wall of the inner pipe. The inner pipe includes a connected bent pipe section and a straight circular pipe section. In order to improve the heat exchange efficiency between the flue gas and the air, a plurality of straight circular pipe sections of the inner pipe are arranged at intervals, and both ends of the plurality of straight circular pipe sections are connected by an inner pipe joint.

[0004] For the balanced flue pipe provided by the prior art, although the heat exchange area between the inner pipe and the air can be increased by arranging a plurality of straight circular pipe sections, and the heat exchange effect can be improved; however, due to the limitation of the diameter of the outer pipe, when the number of straight circular pipe sections increases, the inner diameter of a single straight circular pipe section is smaller, resulting in an increase in the smoke exhaust resistance and affecting the smoothness of smoke exhaust; at the same time, the distance between adjacent two straight circular pipe sections is smaller, resulting in an increase in the air intake resistance and affecting the smoothness of air intake. Summary of the Utility Model

[0005] One of the technical problems to be solved by the utility model is to provide a flue pipe assembly, which can effectively solve the problem that the smoke exhaust resistance and air intake resistance in the balanced flue pipe in the prior art are difficult to balance with the heat exchange efficiency, and improve the smoothness of air intake and smoke exhaust while ensuring the heat exchange effect between the flue gas and the air.

[0006] Another technical problem to be solved by the utility model is to provide a gas water heating device, which can effectively solve the problem that the waste heat of the flue gas in the existing gas water heating device cannot be effectively absorbed and utilized due to unsmooth smoke exhaust and air intake, improve the utilization rate of flue gas waste heat, and reduce the energy consumption of the gas device.

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

[0008] A flue pipe assembly includes an outer air duct and an inner flue pipe arranged at intervals inside the outer air duct. An air intake passage is formed between the outer side wall of the inner flue pipe and the inner side wall of the outer air duct. The outer air duct has a straight outer pipe section extending straight.

[0009] The inner smoke pipe includes a plurality of shunt straight pipes arranged in the outer straight pipe section. The plurality of shunt straight pipes are arranged at intervals around the central axis of the outer straight pipe section and extend coaxially with the outer straight pipe section. Each shunt straight pipe is arranged at intervals from the inner wall of the outer straight pipe section and the adjacent shunt straight pipes. The width of the shunt straight pipe in the circumferential direction of the outer straight pipe section gradually increases in the direction away from the central axis.

[0010] Compared with the background art, the smoke pipe assembly of the present utility model has the following beneficial effects: By arranging a plurality of shunt straight pipes inside the outer straight pipe section, the flue gas entering the inner smoke pipe is shunted into a plurality of shunt straight pipes when flowing downstream to the shunt straight pipes, thereby increasing the total outer wall area of the shunt straight pipes in the outer straight pipe section, and further increasing the heat exchange area between the air in the air intake channel and the flue gas in the shunt straight pipes, improving the heat exchange efficiency, and facilitating the full absorption of the heat of the flue gas; At the same time, since a plurality of shunt straight pipes are arranged at intervals around the central axis of the outer straight pipe section, and the width of each shunt straight pipe in the circumferential direction of the outer straight pipe section gradually increases in the direction away from the central axis, the cross section of the shunt straight pipe is a structure with a small end facing the central axis and a large end away from the central axis. Therefore, the inner end of the shunt straight pipe can be arranged close to the central axis while the outer end can increase the width, thereby being able to increase the number of shunt straight pipes arranged around the central axis while avoiding mutual interference between two shunt straight pipes, and at the same time increasing the cross-sectional area of the inner cavity of the shunt straight pipe, that is, it is more conducive to ensuring that the inner cavity of the shunt straight pipe has a sufficient cross-sectional area for the smooth flow of the flue gas while increasing the number of shunt straight pipes, and improving the smoothness of the flue gas flow in the shunt straight pipes.

[0011] In one embodiment, the shunt straight pipe has two shunt side parts arranged oppositely in the circumferential direction of the outer straight pipe section. The two shunt side parts approach each other in the direction towards the central axis, and the inner ends of the two shunt side parts are connected. An outer end plate part is connected between the outer ends of the two shunt side parts;

[0012] and / or, the number of the shunt straight pipes is 8 - 15.

[0013] In one embodiment, the included angle between the two shunt side parts is 10° - 30°;

[0014] and / or, the two shunt side parts are symmetrically arranged with respect to a plane passing through the central axis and the center of the outer end plate part;

[0015] and / or, the included angle between the two shunt side parts of the same shunt straight pipe is A1, and the included angle between the adjacent two shunt side parts of the adjacent two shunt straight pipes is A2, and A1 = A2.

[0016] In one embodiment, the outer end plate portion is an arc shape coaxial with and spaced from the outer air duct;

[0017] And / or, the inner ends of the two flow dividing side portions are connected by an arc transition;

[0018] And / or, the flow dividing side portion is a flat plate structure.

[0019] In one embodiment, the distance between adjacent two of the flow dividing straight pipes gradually increases in a direction away from the central axis.

[0020] In one embodiment, the inner smoke pipe further includes two smoke pipe connectors disposed in the outer straight pipe section. The first end of the smoke pipe connector is a circular pipe portion and the second end has a plurality of flow dividing ports. The flow dividing ports are arranged in one-to-one correspondence with the flow dividing straight pipes, and the shape of the flow dividing port is adapted to the cross-sectional shape of the flow dividing straight pipe. Each end of the flow dividing straight pipe is detachably connected to the second ends of the two smoke pipe connectors, and the inner cavity of the flow dividing straight pipe is in direct communication with the flow dividing port.

[0021] In one embodiment, the second end of the smoke pipe connector has a central smoke hole coaxial with the outer straight pipe section, and the central smoke hole is in communication with the inner cavity of the outer straight pipe section;

[0022] The inner smoke pipe further includes a central smoke pipe. The two ends of the central smoke pipe are in direct communication with the two central smoke holes respectively, and the central smoke pipe is spaced from the inner ends of all the flow dividing straight pipes.

[0023] In one embodiment, the second end of the smoke pipe connector has a plurality of insertion pipe portions. The insertion pipe portions are arranged at intervals around the central axis, and the end port of each insertion pipe portion away from the circular pipe portion forms the flow dividing port. The end of the flow dividing straight pipe is in insertion fit with the insertion pipe portion, and the distance between the end of all the insertion pipe portions away from the central axis and the central axis is greater than the outer diameter of the circular pipe portion.

[0024] In one embodiment, the end of the circular pipe portion facing the flow dividing straight pipe is closed, and a plurality of communication ports are provided on the end face of the circular pipe portion;

[0025] A transition pipe portion is connected between the closed end of the circular pipe portion and the insertion pipe portion. The transition pipe portions are arranged in one-to-one correspondence with the insertion pipe portions. The inner and outer wall surfaces of the transition pipe portion are smoothly connected to the corresponding wall surfaces of the insertion pipe portion. The outer edge of the end of the transition pipe portion away from the insertion pipe portion coincides with the edge of the end of the circular pipe portion, and the communication ports are in one-to-one correspondence and communication with the inner cavity of the transition pipe portion.

[0026] In one embodiment, the transition pipe portion has two first transition side walls oppositely arranged along the circumferential direction of the circular pipe portion, and the distance between the outer ends of the two first transition side walls gradually decreases in the direction towards the shunt straight pipe.

[0027] The above second technical problem is solved by the following technical solutions:

[0028] A gas water heating device includes the flue pipe assembly as described above.

[0029] Compared with the background art, the gas water heating device of the present utility model has the beneficial effects that by adopting the above flue pipe assembly, the heat exchange efficiency of air and flue gas can be improved, thereby enhancing the energy efficiency of the gas water heating device, ensuring the smoothness of the exhaust and intake of the gas water heater, and improving the use experience of the gas water heating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural view of the flue pipe assembly provided by an embodiment of the present utility model;

[0031] Figure 2 is a longitudinal sectional view of the flue pipe assembly provided by an embodiment of the present utility model;

[0032] Figure 3 is Figure 2 a partial enlarged view of I in

[0033] Figure 4 is Figure 2 a partial enlarged view of J in

[0034] Figure 5 is a transverse sectional view of the flue pipe assembly provided by the present utility model;

[0035] Figure 6 is Figure 5 a front view of the structure in

[0036] Figure 7 is a partial structural view of the inner flue pipe provided by an embodiment of the present utility model;

[0037] Figure 8 is Figure 7 a schematic view of the partial structure in

[0038] Figure 9 is a schematic structural view of the flue pipe joint provided by an embodiment of the present utility model from one perspective;

[0039] Figure 10 is a schematic structural view of the flue pipe joint provided by an embodiment of the present utility model from another perspective;

[0040] Figure 11A cross-sectional view of the smoke pipe joint provided by an embodiment of the present utility model.

[0041] Label description:

[0042] 100, inner smoke pipe; 200, outer air pipe; 201, outer straight pipe section; 2011, air inlet; 202, outer bent pipe section; 2021, outer sealing groove; 300, intake channel; 301, central channel; 302, side channel; 303, outer ring channel;

[0043] 1, smoke pipe joint; 1a, smoke inlet joint; 1b, smoke outlet joint; 11, round pipe part; 111, butt pipe part; 112, flared pipe part; 113, end connection plate part; 1131, communication port; 12, inserted pipe part; 121, shunt port; 13, transition pipe part; 131, first transition side wall; 132, second transition side wall; 14, central pipe part; 141, central smoke hole;

[0044] 2, shunt straight pipe; 21, shunt side part; 22, outer end plate part; 23, flue gas shunt channel;

[0045] 3, central smoke pipe;

[0046] 4, exhaust pipe; 41, smoke outlet pipe part; 411, exhaust port; 42, connecting pipe part; 43, sealing plate part;

[0047] 5, inner bent pipe section; 51, inner sealing groove. Detailed implementation manners

[0048] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0049] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 construed as a limitation to the present application.

[0050] 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 quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0051] In the description of this application, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected" and "coupled" should be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] This embodiment provides a flue pipe assembly, which can be applied to gas water heating equipment to achieve the intake of air while discharging flue gas, improve the heat exchange efficiency between the flue gas and the air, and reduce the processing cost of the flue pipe assembly. Among them, the gas water heating equipment can be, but is not limited to, a gas water heater, a gas wall-mounted boiler, etc.

[0053] As Figure 1 and Figure 5 shown, in this embodiment, the flue pipe assembly includes an outer air duct 200 and an inner flue pipe 100 disposed at intervals inside the outer air duct 200. An intake passage 300 is formed between the outer side wall of the inner flue pipe 100 and the inner side wall of the outer air duct 200. The outer air duct 200 has a straight outer straight section 201. The inner flue pipe 100 includes a plurality of flow splitting straight pipes 2 disposed in the outer straight section 201. The plurality of flow splitting straight pipes 2 are arranged at intervals around the central axis of the outer straight section 201 and extend coaxially with the outer straight section 201. Each flow splitting straight pipe 2 is spaced from the inner wall of the outer straight section 201 and the adjacent flow splitting straight pipes 2. The width of the flow splitting straight pipe 2 in the circumferential direction of the outer straight section 201 gradually increases in the direction away from the central axis.

[0054] The smoke pipe assembly provided in the present embodiment is provided with a plurality of diverter straight pipes 2 inside the outer straight pipe section 201, so that the smoke entering the inner smoke pipe 100 is diverted to the plurality of diverter straight pipes 2 when flowing downstream to the diverter straight pipe 2, thereby increasing the total outer wall area of ​​the diverter straight pipe 2 in the outer straight pipe section 201, thereby increasing the heat exchange area between the air in the air inlet channel 300 and the smoke in the diverter straight pipe 2, improving the heat exchange efficiency, and facilitating the full absorption of the heat of the smoke; at the same time, since a plurality of diverter straight pipes 2 are arranged at intervals around the central axis of the outer straight pipe section 201, and each diverter straight pipe 2 is away from the outer straight pipe section 201 along the circumferential width along the outer straight pipe section 201 The direction of the central axis gradually increases, so that the cross-section of the diverter straight pipe 2 is a structure that is small at one end facing the central axis and large at the other end away from the central axis, so that the inner end of the diverter straight pipe 2 can be arranged close to the central axis and the outer end can increase the width, thereby avoiding mutual interference between the two diverter straight pipes 2, and increasing the number of diverter straight pipes 2 arranged around the central axis, while increasing the cross-sectional area of ​​the diverter straight pipe 2, that is, it is more conducive to increasing the number of diverter straight pipes 2 while ensuring that the inner cavity of the diverter straight pipe 2 has sufficient cross-sectional area for smooth flow of smoke, thereby improving the flow smoothness of smoke in the diverter straight pipe 2.

[0055] It can be understood that the inner cavity of each diverting straight pipe 2 forms a smoke diverting channel 23, the smoke inlet ends of all smoke diverting channels 23 are connected to the smoke inlet of the inner smoke pipe 100, and the smoke outlet ends of all smoke diverting channels 23 are connected to the smoke outlet 411 of the inner smoke pipe 100. The cross-sectional shape of the smoke diverting channel 23 is adapted to the cross-sectional shape of the diverting straight pipe 2.

[0056] In order to improve the processing and assembly convenience of the inner smoke pipe 100, in one embodiment, the inner smoke pipe 100 also includes two smoke pipe joints 1 arranged in the outer straight pipe section 201, the first end of the smoke pipe joint 1 is a circular tube portion 11 and the second end has a plurality of diversion ports 121, the diversion ports 121 are arranged one-to-one with the diversion straight pipes 2, and the shape of the diversion ports 121 is adapted to the cross-sectional shape of the diversion straight pipes 2, the two ends of each diversion straight pipe 2 are respectively detachably connected to the second ends of the two smoke pipe joints 1, and the smoke diversion channel 23 is directly connected to the diversion port 121. By setting two smoke pipe joints 1, and both ends of all the diversion straight pipes 2 are detachably connected to the two smoke pipe joints 1, it is convenient to realize the separate processing and assembly of the smoke pipe joints 1 and the diversion straight pipes 2, and reduce the processing difficulty of the diversion straight pipes 2 and the smoke pipe joints 1; at the same time, the first end of each smoke pipe joint 1 is a circular tube portion 11, which is convenient for the first end of the smoke pipe joint 1 to be connected with the corresponding upstream circular tube or downstream circular tube, and is conducive to guiding the diversion of smoke when it flows to the diversion straight pipe 2 and the confluence of smoke when it flows out of the diversion straight pipe 2.

[0057] Two smoke pipe connectors 1 are connected to all the shunt straight pipes 2 to form a straight smoke pipe, and the straight smoke pipe is located inside the outer straight pipe section 201. For the convenience of subsequent description, the smoke pipe connector 1 connected to the smoke inlet end of the shunt straight pipe 2 is called the smoke inlet connector 1a, and the smoke pipe connector 1 connected to the smoke outlet end of the shunt straight pipe 2 is called the smoke exhaust connector 1b.

[0058] As Figure 2 and Figure 3 shown, to improve the convenience of the cooperation between the smoke pipe assembly and other structures, the outer air duct 200 further includes an outer bent pipe section 202, and the outer bent pipe section 202 is connected to the air outlet end of the outer straight pipe section 201. The inner smoke pipe 100 includes an inner bent pipe section 5. One end of the inner bent pipe section 5 is coaxially connected to the circular pipe portion 11 of the smoke inlet connector 1a. The inner bent pipe section 5 is coaxially and spaced inside the outer bent pipe section 202. The smoke inlet end of the inner bent pipe section 5 extends outwards from the outer bent pipe section 202 to facilitate connection with the smoke collecting hood of the gas water heating device. The port of the smoke inlet end of the inner bent pipe section 5 forms the smoke inlet of the inner smoke pipe 100.

[0059] It should be noted that the smoke inlet end of the inner smoke pipe 100 is correspondingly arranged with the air outlet end of the outer air duct 200, and the smoke outlet pipe of the inner smoke pipe 100 is correspondingly arranged with the air inlet end of the outer air duct 200.

[0060] The air outlet end of the outer straight pipe section 201 is press-fitted inside the air inlet end of the outer bent pipe section 202 to improve the assembly convenience. In one embodiment, the air inlet end of the outer bent pipe section 202 is formed with an outer sealing groove 2021 by internal and external stamping. An outer sealing ring is arranged in the outer sealing groove 2021, and the outer sealing ring is pressed between the outer wall of the outer straight pipe section 201 and the bottom of the outer sealing groove 2021 to achieve the seal at the connection between the outer bent pipe section 202 and the outer straight pipe section 201. However, it can be understood that the above assembly structure between the outer bent pipe section 202 and the outer straight pipe section 201 is only an exemplary structure, and any existing structure for realizing the assembly of the outer bent pipe section 202 and the outer straight pipe section 201 can be applied to this embodiment.

[0061] In one embodiment, the smoke inlet connector 1a is detachably connected to the inner bent pipe section 5 to improve the assembly and disassembly convenience of the inner smoke pipe 100. Specifically, the circular pipe portion 11 of the smoke inlet connector 1a is press-fitted inside the smoke outlet end of the inner bent pipe section 5. Further, the smoke outlet end of the inner bent pipe section 5 is formed with an inner sealing groove 51 by stamping from the inside to the outside. An inner sealing ring is arranged in the inner sealing groove 51, and the inner sealing ring is squeezed between the bottom of the inner sealing groove 51 and the circular pipe portion 11 to achieve the seal between the smoke inlet connector 1a and the inner bent pipe section 5. However, it can be understood that the above sealing and inserting structure between the inner bent pipe section 5 and the circular pipe portion 11 of the smoke inlet connector 1a is only an exemplary structure, and any structure in the prior art that can realize the sealed connection of two tubular structures can be applied to the present invention, and the present invention does not make any limitation and elaboration on this.

[0062] AsFigure 1 and Figure 5 As shown in Figure 5 , in one embodiment, an air inlet 2011 is provided on the outer side wall of the air inlet end of the outer straight pipe section 201. A plurality of air inlets 2011 are circumferentially spaced along the outer straight pipe section 201, so that the air inlet of the air intake passage 300 is a lateral air inlet, avoiding the interference between the air inlet of the air intake passage 300 and the smoke exhaust of the inner smoke pipe 100. At the same time, it also reduces the probability that the smoke discharged from the inner smoke pipe 100 enters the air intake passage 300 again through the air inlet 2011, reducing the probability of smoke backflow.

[0063] To further reduce the probability of the discharged smoke entering the air intake passage 300, the smoke outlet end of the inner smoke pipe 100 extends out of the outer air pipe 200 by a preset length, thereby increasing the distance between the smoke outlet 411 and the air inlet 2011 at the smoke outlet end.

[0064] In one embodiment, the inner smoke pipe 100 further includes a smoke exhaust pipe 4. The smoke exhaust pipe 4 is coaxially connected to the circular pipe portion 11 of the smoke exhaust joint 1b, and the smoke exhaust pipe 4 is connected to the air inlet end of the outer air pipe 200. Thus, through the connection between the smoke exhaust pipe 4 and the outer air pipe 200, the support for the smoke outlet end of the inner smoke pipe 100 can be realized, avoiding the shaking of the inner smoke pipe 100 relative to the outer air pipe 200, and improving the setting stability of the smoke pipe assembly; at the same time, this setting can simplify the structure of the smoke exhaust joint 1b, so that the smoke exhaust joint 1b and the smoke inlet joint 1a can adopt the same structure, which is conducive to realizing the general setting of the smoke pipe joint 1.

[0065] The smoke exhaust pipe 4 and the smoke exhaust joint 1b are preferably detachably connected to improve the assembly and disassembly efficiency of the inner smoke pipe 100 and facilitate the connection between the smoke exhaust pipe 4 and the outer air pipe 200. In one embodiment, the smoke exhaust pipe 4 includes a smoke outlet pipe portion 41 and a connecting pipe portion 42 that are coaxially and spaced apart. The connecting pipe portion 42 and the air inlet end of the outer straight pipe section 201 are inserted and matched, and the smoke outlet pipe portion 41 and the circular pipe portion 11 of the smoke exhaust joint 1b are inserted and matched.

[0066] In one embodiment, a sealing plate portion 43 is connected between the connecting pipe portion 42 and the smoke outlet pipe portion 41 to close the port of the air inlet end of the outer straight pipe section 201, so that the air inlet of the air intake passage 300 only passes through the air inlet 2011, further reducing the probability of smoke entering the air intake passage 300.

[0067] As Figure 5 and Figure 6As shown, in order to reduce the processing difficulty of the shunt straight pipe 2, in one embodiment, the shunt straight pipe 2 has two shunt side parts 21 circumferentially spaced along the circumferential direction of the circular pipe part 11 and an outer end plate part 22 connected between the outer ends of the shunt side parts 21. One ends of the two shunt side parts 21 facing the central axis approach and are connected to each other, so that the distance between the two shunt side parts 21 decreases along the direction towards the central axis, thereby making the width of the flue gas shunt channel 23 along the circumferential direction of the outer straight pipe section 201 gradually decrease along the direction towards the central axis. This is conducive to realizing the setting that the cross-sectional area of the flue gas shunt channel 23 gradually increases along the direction away from the central axis, effectively simplifies the processing of the shunt straight pipe 2 and the corresponding flue pipe joint 1, and reduces the processing cost; at the same time, this setting is also conducive to making the inner end of the shunt straight pipe 2 extend along the direction towards the central axis while avoiding interference between adjacent two shunt straight pipes 2, and ensuring the reasonable arrangement of the shunt straight pipes 2.

[0068] The cross-section of the shunt straight pipe 2 is triangular or fan-shaped, and one apex angle of the triangle or fan shape is arranged towards the central axis, so that the cross-sectional area of the flue gas shunt channel 23 of the shunt straight pipe 2 is in a triangular or fan-shaped structure. In other embodiments, the cross-section of the shunt straight pipe 2 can also be trapezoidal or other special-shaped structures.

[0069] In one embodiment, the shunt side part 21 is a flat plate structure to simplify the processing of the shunt straight pipe 2, reduce the processing difficulty of the shunt straight pipe 2, and at the same time reduce the air flow resistance. In other embodiments, the shunt side part 21 can also be an inner concave or outer convex arc surface structure, or a corrugated plate or a concave-convex plate structure.

[0070] In one embodiment, the shunt pipe parts are symmetrically arranged relative to a plane passing through the central axis and the center line of the outer end plate part 22, which is more conducive to realizing the arrangement of multiple shunt straight pipes 2 around the central axis, and is conducive to improving the air flow uniformity at various circumferential positions of the air inlet channel 300 in the air inlet pipe, so as to better ensure the heat exchange uniformity of the flue pipe assembly in the circumferential direction of the outer straight pipe section 201.

[0071] In one embodiment, the inner ends of the two shunt side parts 21 are connected by an arc transition, and the opening of the arc faces away from the central axis, which can reduce the resistance of the air passing through the inner ends of the shunt straight pipe 2, improve the smoothness of the air flow between the inner ends of the shunt straight pipe 2, and is conducive to the processing of the shunt straight pipe 2. Further, the shunt side part 21 and the outer end plate part 22 are connected by an arc to make the overall outer surface of the shunt straight pipe 2 form a smooth surface, reduce the resistance of the air flowing through the shunt straight pipe 2, and thus reduce the noise generated during the flow.

[0072] It can be understood that when the included angle between the diversion side portions 21 of the diversion straight pipes 2 is larger, since the occupation of the circumferential space inside the outer straight pipe section 201 by the diversion straight pipes 2 increases, at the same time, to ensure the air intake volume, the distance between two adjacent diversion straight pipes 2 needs to be increased simultaneously, which further leads to a reduction in the number of diversion straight pipes 2 that can be arranged, resulting in a significant decrease in the heat exchange efficiency; or it is necessary to increase the distance between the outer ends of the diversion straight pipes 2 and the inner wall of the outer straight pipe section 201 to ensure the air passage volume, and this method will reduce the wrapping effect of the air on the diversion straight pipes 2, which is not conducive to improving the heat exchange efficiency. To better balance the relationship between the flue gas flow resistance and the heat exchange efficiency of a single flue gas diversion channel 23, in an embodiment, the included angle between the two diversion side portions 21 of the same diversion straight pipe 2 is 10° - 30°, and the number of diversion straight pipes 2 is 8 - 15.

[0073] In an embodiment, the distance between two adjacent diversion straight pipes 2 gradually increases in the direction away from the central axis, which is conducive to realizing the smooth flow of air between two adjacent diversion straight pipes 2 and reducing the resistance of the air flowing in the intake channel 300. Further, the included angle between two adjacent diversion side portions 21 is 10° - 30°, so as to ensure that the cross-sectional area of the intake channel 300 between two adjacent diversion straight pipes 2 can realize the smooth flow of air at this place.

[0074] In an embodiment, the included angle between the two diversion side portions 21 of the same diversion straight pipe 2 is A1, and the included angle between the two adjacent diversion side portions 21 of two adjacent diversion straight pipes 2 is A2, and A1 = A2. Thus, the cross-sectional area of the flue gas diversion channel 23 inside the diversion straight pipe 2 is approximately equal to the cross-sectional area of the intake channel 300 between two diversion straight pipes 2, which is conducive to realizing the heat exchange between the flue gas and the air at the diversion side portion 21. While ensuring the smoothness of the flue gas and air flow, the heat exchange efficiency is greatly improved; and this kind of setting is also conducive to setting the number and structure of the diversion straight pipes 2.

[0075] In an embodiment, the outer end plate portion 22 of the diversion straight pipe 2 is an arc structure coaxially arranged with the outer air duct 200, so that the distance between the outer end plate portion 22 and the inner wall of the outer air duct 200 is equal everywhere, which is conducive to improving the smoothness of the air flow between the outer end plate portion 22 and the outer air duct 200. In other embodiments, the outer end plate portion 22 can also be a flat plate structure.

[0076] The distance between the outer end plate portion 22 and the inner wall of the outer air duct 200 is d1, and d1 = 5mm - 15mm. Thus, on the basis of keeping the inner diameter of the outer air duct 200 unchanged, the extension length of the diversion straight pipe 2 in the radial direction of the outer air duct 200 can be increased, the cross-sectional area of the flue gas diversion channel 23 inside the diversion straight pipe 2 can be ensured, and it is conducive to ensuring the smoothness of the air flow between the outer end plate portion 22 and the inside of the outer air duct 200.

[0077] In one embodiment, the inner ends of two adjacent diversion straight pipes 2 are spaced apart to facilitate the flow of air between the inner ends of the two adjacent diversion straight pipes 2, so that the air can completely wrap the diversion straight pipes 2, further improving the heat exchange efficiency between the air and the flue gas. At the same time, this setting also helps to reduce the interference between the diversion straight pipes 2 and prevent local high temperatures from occurring at the inner ends of the diversion straight pipes 2 due to insufficient heat exchange.

[0078] Define the air inlet channel 300 between two adjacent diversion straight pipes 2 as the side channel 302, and the distance between the inner ends of the side channel 302 is 2 mm to 5 mm to ensure the smooth flow of air at the inner ends of the two diversion straight pipes 2.

[0079] Since it is necessary to ensure that the inner ends of two adjacent diversion straight pipes 2 are spaced apart, there is a distance d2 between the inner end of the diversion straight pipe 2 and the central axis. In one embodiment, d2 = 12 mm to 20 mm, which is conducive to achieving the spaced arrangement of two adjacent diversion straight pipes 2 and facilitating the arc transition connection between the two diversion side parts 21 of the same diversion straight pipe 2.

[0080] That is, the air inlet channel 300 includes a central channel 301 located between all the diversion straight pipes 2, a plurality of side channels 302 located between two adjacent diversion straight pipes 2, and an outer ring channel 303 located between the outer ends of the diversion straight pipes 2 and the inner wall of the outer straight pipe section 201. The side channels 302 communicate with the outer ring channel 303 and the central channel 301 to ensure the smooth flow of air in the air inlet channel 300.

[0081] In one embodiment, the second end of the flue pipe joint 1 also has a central flue hole 141 coaxial with the central axis, and the central flue hole 141 communicates with the inner cavity of the circular pipe part 11. The inner flue pipe 100 further includes a central flue pipe 3, the central flue pipe 3 is coaxially arranged with the outer straight pipe section 201, and the two ends of the central flue pipe 3 are respectively directly opposite and communicated with the central flue hole 141, thereby enabling the utilization of the central region formed by enclosing all the diversion straight pipes 2 and further increasing the heat exchange efficiency between the flue gas and the air.

[0082] Furthermore, the outer diameter of the central flue pipe 3 is less than or equal to.d, so that there is enough gap for air to pass between the central flue pipe 3 and the diversion straight pipes 2. The inner diameter of the central flue pipe 3 is greater than 8 mm to ensure the smooth flow of flue gas in the central flue pipe 3.

[0083] Such as Figures 7 to 11As shown in the figure, to improve the convenience of connecting the flue pipe joint 1 and the shunt straight pipe 2, in one embodiment, the second end of the flue pipe joint 1 has a plurality of insertion pipe parts 12. The plurality of insertion pipe parts 12 are arranged around the central axis of the circular pipe part 11, and the end port of each insertion pipe part 12 away from the circular pipe part 11 forms a shunt port 121. The end of the shunt straight pipe 2 is inserted and matched with the insertion pipe part 12, and the diameter of the contour circle where one ends of all the insertion pipe parts 12 away from the central axis are located is greater than the outer diameter of the circular pipe part 11.

[0084] By providing the insertion pipe parts 12 and forming the shunt port 121 at the end of the insertion pipe parts 12, it is beneficial to realize the insertion and matching between the flue pipe joint 1 and each shunt straight pipe 2, and improve the installation convenience and assembly reliability of the flue pipe joint 1 and the shunt straight pipe 2. At the same time, since the diameter of the contour circle where one ends of all the insertion pipe parts 12 away from the central axis are located is greater than the outer diameter of the circular pipe part 11, the dimension of a single shunt straight pipe 2 along the radial direction of the circular pipe part 11 can be increased, thereby increasing the cross-sectional area of the shunt straight pipe 2, further reducing the flue gas resistance, and improving the smoothness of smoke exhaust.

[0085] To improve the installation convenience of the central flue pipe 3, in one embodiment, the second end of the flue pipe joint 1 has a central pipe part 14 coaxial with the circular pipe part 11. The port of the central pipe part 14 away from the circular pipe part 11 forms a central flue hole 141. The central flue pipe 3 is inserted outside the central pipe part 14 and the two are in interference fit to avoid leakage at the connection.

[0086] In other embodiments, the end of the circular pipe part 11 facing the shunt straight pipe 2 can be closed, and a shunt port 121 and a central flue hole 141 are opened on the end face of the circular pipe part 11, so that each shunt straight pipe 2 is inserted at the shunt port 121, and the central flue pipe 3 is inserted into the central flue hole 141.

[0087] In one embodiment, the shunt straight pipe 2 is inserted outside the insertion pipe part 12. Thus, when the size of the insertion pipe part 12 remains unchanged, the cross-sectional area of the shunt straight pipe 2 can be made larger than the cross-sectional area of the shunt port 121, while reducing the processing difficulty of the flue pipe joint 1, and further increasing the cross-sectional area of the inner cavity of the shunt straight pipe 2. In other embodiments, the end of the shunt straight pipe 2 can also be inserted inside the shunt port 121 of the insertion pipe part 12.

[0088] The cross-section of the inserted pipe portion 12 is equal everywhere along the axial direction of the central axis. To improve the processing convenience of the smoke pipe joint 1, in one embodiment, one end of the circular pipe portion 11 facing the shunt straight pipe 2 is closed, and a plurality of communication ports 1131 are provided on the end face of the circular pipe portion 11; a transition pipe portion 13 is connected between the closed end of the circular pipe portion 11 and the inserted pipe portion 12, and the transition pipe portion 13 is provided corresponding to the inserted pipe portion 12 one by one. The inner and outer wall surfaces of the transition pipe portion 13 are smoothly connected to the corresponding wall surfaces of the inserted pipe portion 12. The outer edge of the end of the transition pipe portion 13 away from the inserted pipe portion 12 coincides with the end edge of the circular pipe portion 11, and the communication ports 1131 are in one-to-one correspondence with the inner cavity of the transition pipe portion 13. By providing the transition pipe portion 13, it is beneficial to realize that the outer diameter of the outer contour circle of the smoke pipe joint 1 gradually increases from the circular pipe portion 11 to the shunt straight pipe 2, so as to facilitate the smooth flow of the flue gas from the circular pipe portion 11 to the inserted pipe portion 12, and also facilitate the smooth flow of the air from the inserted pipe portion 12 to the circular pipe portion 11, reduce the flow resistance of the flue gas and air, and improve the smoothness of smoke exhaust and air intake.

[0089] In one embodiment, the intervals between adjacent two transition pipe portions 13 are provided to ensure that there is a gap for air flow between adjacent two transition pipe portions 13. Specifically, the transition pipe portion 13 has two first transition side walls 131 oppositely arranged along the circumferential direction of the circular pipe portion 11 and a second transition side wall 132 connected between the outer ends of the two first transition side walls 131, and the inner ends of the two first transition side walls 131 are connected. The second transition side walls 132 between adjacent two transition pipe portions 13 are arranged at intervals.

[0090] In one embodiment, the distance between the outer ends of the two first transition side walls 131 gradually decreases along the direction towards the shunt straight pipe 2. This kind of setting can ensure that the distance between the outer ends of the two first transition side walls 131 at the connection position with the inserted pipe portion 12 is equal to the outer end width of the inserted pipe portion 12, while increasing the outer end distance of the two first transition side walls 131 on the side away from the inserted pipe portion 12, so as to increase the connection area between the transition pipe portion 13 and the circular pipe portion 11, improve the connection strength between the transition pipe portion 13 and the circular pipe portion 11, and reduce the probability of deformation; at the same time, this kind of setting can limit the insertion of the shunt straight pipe 2 into the transition pipe portion 13, so as to position and limit the assembly position of the shunt straight pipe 2 and the smoke pipe joint 1, and improve the assembly efficiency and assembly accuracy.

[0091] In one embodiment, the circular tube portion 11 includes a butt joint tube portion 111 and a flared tube portion 112 that are coaxially connected. The flared tube portion 112 is connected between the butt joint tube portion 111 and the transition tube portion 13. One end of the flared tube portion 112 away from the butt joint tube portion 111 is connected with an end connection plate portion 113, and the above-mentioned shunt holes and the central smoke hole 141 are provided on the end connection plate portion 113. The inner diameter of the flared tube portion 112 is greater than the inner diameter of the circular tube portion 11, the outer diameter of the flared tube portion 112 is greater than the outer diameter of the butt joint tube portion 111, the inner diameter and the outer diameter of the butt joint tube portion 111 are equal along the axis everywhere, and the butt joint tube portion 111 is inserted and matched with the corresponding inner bent tube section 5 and the smoke exhaust pipe 4. Thus, while facilitating the connection between the circular tube portion 11 and the corresponding inner bent tube section 5 or the smoke exhaust pipe 4, the end face area of the closed end of the circular tube portion 11 is increased, thereby improving the connection convenience of the transition tube portion 13 at the closed end of the circular tube portion 11.

[0092] This embodiment also provides a gas water heating device, including the above-mentioned smoke pipe assembly. The remaining structures of the gas water heating device can be set with reference to the prior art, which is not the focus of the present utility model and will not be limited and described in detail here.

[0093] The gas water heating device provided by this embodiment, by adopting the above-mentioned smoke pipe assembly, can improve the heat exchange efficiency of air and flue gas, thereby enhancing the energy efficiency of the gas water heating device, ensuring the smoothness of the gas water heater's smoke exhaust and air intake, and improving the use experience of the gas water heating device.

[0094] In the specific content of the above specific implementation manner, each technical feature can be combined arbitrarily without contradiction. For the sake of brief description, not all possible combinations of the above technical features are described. However, as long as the combinations of these technical features do not conflict, they should all be considered as within the scope described in this specification.

[0095] The specific content of the above specific implementation manner only expresses several implementation manners of the present utility model, and its description is relatively specific and detailed, but it cannot be understood as a limitation to the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model should be subject to the appended claims.

Claims

1. A tobacco pipe assembly, characterized in that, It includes an outer air duct (200) and an inner smoke pipe (100) arranged at intervals inside the outer air duct (200). An air intake channel (300) is formed between the outer side wall of the inner smoke pipe (100) and the inner side wall of the outer air duct (200). The outer air duct (200) has a straight outer straight pipe section (201); The inner smoke pipe (100) includes a plurality of shunt straight pipes (2) arranged in the outer straight pipe section (201). The plurality of shunt straight pipes (2) are arranged at intervals around the central axis of the outer straight pipe section (201) and extend coaxially with the outer straight pipe section (201). Each shunt straight pipe (2) is arranged at intervals with the inner wall of the outer straight pipe section (201) and the adjacent shunt straight pipe (2). The width of the shunt straight pipe (2) in the circumferential direction of the outer straight pipe section (201) gradually increases in the direction away from the central axis.

2. The flue pipe assembly according to claim 1, wherein The shunt straight pipe (2) has two shunt side parts (21) arranged oppositely in the circumferential direction of the outer straight pipe section (201). The two shunt side parts (21) approach each other in the direction towards the central axis, and the inner ends of the two shunt side parts (21) are connected. An outer end plate part (22) is connected between the outer ends of the two shunt side parts (21); and / or, the number of the shunt straight pipes (2) is 8 to 15.

3. The smoke pipe assembly according to claim 2, characterized in that, The included angle between the two shunt side parts (21) is 10° to 30°; and / or, the two shunt side parts (21) are symmetrically arranged with respect to a plane passing through the central axis and the center of the outer end plate part (22); and / or, the included angle between the two shunt side parts (21) of the same shunt straight pipe (2) is A1, and the included angle between the adjacent two shunt side parts (21) of the adjacent two shunt straight pipes (2) is A2, and A1 = A2.

4. The tobacco pipe assembly according to claim 2, wherein, The outer end plate part (22) is a circular arc shape coaxial with and spaced from the outer air duct (200); and / or, the inner ends of the two shunt side parts (21) are connected by an arc transition; and / or, the shunt side part (21) is a flat plate structure.

5. The smoke pipe assembly according to claim 1, characterized in that, The distance between the adjacent two shunt straight pipes (2) gradually increases in the direction away from the central axis.

6. The tobacco pipe assembly according to any one of claims 1-5, characterized in that, The inner smoke pipe (100) further includes two smoke pipe connectors (1) arranged in the outer straight pipe section (201). The first end of the smoke pipe connector (1) is a circular pipe part (11) and the second end has a plurality of shunt ports (121). The shunt ports (121) are arranged in one-to-one correspondence with the shunt straight pipes (2), and the shape of the shunt port (121) is adapted to the cross-sectional shape of the shunt straight pipe (2). The two ends of each shunt straight pipe (2) are detachably connected to the second ends of the two smoke pipe connectors (1), and the inner cavity of the shunt straight pipe (2) is directly communicated with the shunt port (121).

7. The tobacco pipe assembly according to claim 6, wherein The second end of the smoke pipe connector (1) has a central smoke hole (141) coaxially arranged with the circular pipe part (11), and the central smoke hole (141) is communicated with the inner cavity of the circular pipe part (11); The inner smoke pipe (100) further includes a central smoke pipe (3), both ends of the central smoke pipe (3) are directly opposite and communicated with the two central smoke holes (141), and the central smoke pipe (3) is spaced from the inner ends of all the shunt straight pipes (2).

8. The tobacco pipe assembly according to claim 6, wherein, The second end of the smoke pipe joint (1) has a plurality of insertion pipe parts (12), the insertion pipe parts (12) are arranged at intervals around the central axis, and an end port of each insertion pipe part (12) away from the circular pipe part (11) forms the shunt port (121). The end of the shunt straight pipe (2) is in plug-in fit with the insertion pipe part (12), and the distance between the end of all the insertion pipe parts (12) away from the central axis and the central axis is greater than the outer diameter of the circular pipe part (11).

9. The tobacco pipe assembly according to claim 8, wherein, One end of the circular pipe part (11) facing the shunt straight pipe (2) is closed, and a plurality of communication ports (1131) are arranged on the end face of the circular pipe part (11); A transition pipe part (13) is connected between the closed end of the circular pipe part (11) and the insertion pipe part (12). The transition pipe part (13) is arranged in one-to-one correspondence with the insertion pipe part (12). The inner and outer wall surfaces of the transition pipe part (13) are smoothly connected with the corresponding wall surfaces of the insertion pipe part (12). The outer edge of the end of the transition pipe part (13) away from the insertion pipe part (12) coincides with the end edge of the circular pipe part (11), and the communication port (1131) is in one-to-one correspondence and communication with the inner cavity of the transition pipe part (13).

10. The smoke pipe assembly according to claim 9, characterized in that, The transition pipe part (13) has two first transition side walls (131) oppositely arranged along the circumferential direction of the circular pipe part (11), and the distance between the outer ends of the two first transition side walls (131) gradually decreases in the direction towards the shunt straight pipe (2).

11. A gas water heating device, characterized in that, Comprising a smoke pipe assembly according to any one of claims 1-10.

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