Smoke tube structure of gas heating furnace

Abstract

The utility model discloses a smoke tube structure of a gas heating furnace, which relates to the technical field of heating furnaces and comprises an outer tube. The inner-layer pipe is located in the outer-layer pipe, the inner-layer pipe comprises an inner-layer bent pipe, an inner-layer straight pipe and an inner-layer pipe first sealing ring, the front side of the upper side of the inner-layer bent pipe is provided with an inner-layer bent pipe first through pipe part, and the rear side of the inner-layer straight pipe is provided with an inner-layer straight pipe first through pipe part; the supporting ring is located between the inner side wall of the outer-layer pipe and the outer side wall of the inner-layer pipe; a first sealing ring of the inner-layer pipe ensures the sealing effect of a connecting gap between the inner-layer bent pipe and the inner-layer straight pipe, and a supporting ring is located between the inner side wall of the outer-layer pipe and the outer side wall of the inner-layer pipe and plays a role in fixing the outer-layer pipe and the inner-layer pipe, so that connection between the inner-layer bent pipe and the inner-layer straight pipe is avoided; and it is ensured that waste gas cannot enter the gas inlet channel from a gap between the inner-layer bent pipe and the inner-layer straight pipe to cause blow-by, and it is ensured that the gas heating stove works normally and stably.

Description

Technical Field

[0001] This utility model relates to the field of heating furnace technology, and in particular to a flue structure for a gas-fired heating furnace. Background Technology

[0002] To facilitate air circulation, existing gas-fired boilers often employ a double-layer flue system for air intake and exhaust. This consists of a double-layer pipe structure formed by connecting two straight pipes and two bent pipes. The outer layer of the flue system is used for air intake, supplying fresh air to the boiler. The inner layer is used for exhaust, expelling the waste gas produced by the boiler.

[0003] However, in practice, because the connection between the straight and curved sections of the inner tube is inside the outer tube, it is difficult to ensure a sealing effect by applying sealant. As a result, during long-term use, this type of flue is prone to leakage at the connection between the straight and curved sections of the inner tube. The exhaust gas from the inner tube mixes with the fresh air input from the outer tube, causing cross-contamination and affecting the combustion efficiency of the gas-fired boiler. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a flue structure for a gas-fired heating boiler.

[0005] According to an embodiment of the present invention, a gas-fired boiler flue structure includes: an outer tube having a cavity; and an inner tube located inside the outer tube. A space is left between the inner wall of the outer tube and the outer wall of the inner tube as an air inlet channel. The inner tube includes an inner bend, an inner straight tube, and an inner tube first sealing ring. The front side of the upper side of the inner bend has a first through-pipe portion, and the rear side of the inner straight tube has a first through-pipe portion. The first through-pipe portion of the inner bend is connected to the inner tube... The first through-pipe of the inner layer tube is connected to the first through-pipe of the inner layer tube, and the first sealing ring of the inner layer tube is located between the first through-pipe of the inner layer tube and the first through-pipe of the inner layer tube; the first support ring is located between the inner sidewall of the outer layer tube and the outer sidewall of the inner layer tube, and the airflow in the air intake channel can pass through the first support ring. The outer sidewall of the first support ring has an outer support portion, and the inner sidewall of the first support ring has an inner support portion. The outer support portion locks the inner sidewall of the outer layer tube, and the inner support portion locks the outer sidewall of the inner layer tube.

[0006] According to some embodiments of the present invention, the outer tube includes an outer bend, an outer straight tube, and an outer tube first sealing ring. The upper front side of the outer bend has an outer bend first through-pipe portion, and the rear side of the outer straight tube has an outer straight tube first through-pipe portion. The outer bend first through-pipe portion is connected to the outer straight tube first through-pipe portion, and the outer tube first sealing ring is located between the outer bend first through-pipe portion and the outer straight tube first through-pipe portion.

[0007] According to some embodiments of the present invention, the first through-pipe of the outer straight pipe is inserted into the first through-pipe of the outer bent pipe, and the inner side wall of the first through-pipe of the outer bent pipe is provided with a first sealing ring fixing groove for the outer pipe, and the first sealing ring of the outer pipe is located in the first sealing ring fixing groove for the outer pipe.

[0008] According to some embodiments of the present invention, the outer straight pipe is provided with an outer straight pipe plug at its front end, and an air inlet is provided on the side wall of the front end of the outer straight pipe. The inner pipe extends forward through the outer straight pipe plug, and the inner straight pipe is provided with an inner straight pipe plug at its front end. An exhaust hole is provided on the side wall of the front end of the inner straight pipe.

[0009] According to some embodiments of the present invention, the lower side of the outer bend has a second through-pipe section, the inner wall of the second through-pipe section is provided with a second sealing ring, the second through-pipe section is connected to the air inlet of the heating furnace, and the second sealing ring is located between the second through-pipe section and the air inlet of the heating furnace.

[0010] According to some embodiments of the present invention, the first through-pipe of the inner straight pipe is inserted into the first through-pipe of the inner bent pipe, and the outer wall of the first through-pipe of the inner straight pipe is provided with a first through-pipe protrusion of the inner straight pipe, and the first sealing ring of the inner pipe is sleeved on the first through-pipe protrusion of the inner straight pipe.

[0011] According to some embodiments of the present invention, the lower side of the inner bend has a second through-pipe section, the inner wall of the second through-pipe section is provided with a second sealing ring, the second through-pipe section is connected to the exhaust port of the heating furnace, and the second sealing ring is located between the second through-pipe section and the exhaust port of the heating furnace.

[0012] According to some embodiments of the present invention, a second support ring is also included. The first support ring is located between the inner rear wall of the outer straight pipe and the outer rear wall of the inner straight pipe, and the second support ring is located between the inner lower wall of the outer curved pipe and the outer lower wall of the inner curved pipe. The airflow in the air intake channel can pass through the first support ring and the second support ring.

[0013] According to some embodiments of the present invention, the first support ring is a polygonal annular structure, the first support ring includes straight sides, and support corner positions are provided between the straight sides. The inner support portion is located on the straight sides, and the outer support portion is located on the support corner positions.

[0014] According to some embodiments of the present invention, the supporting corner has an arc-shaped surface, and the outer supporting part is located on the arc-shaped surface.

[0015] The flue structure of the gas-fired boiler according to the embodiment of this utility model has at least the following technical effects: the first sealing ring of the inner tube ensures the sealing effect of the connection gap between the inner bend and the inner straight tube; the support ring is located between the inner wall of the outer tube and the outer wall of the inner tube and plays a role in fixing the outer tube and the inner tube, preventing the connection between the inner bend and the inner straight tube from moving, ensuring that exhaust gas will not enter the air intake channel from the gap between the inner bend and the inner straight tube and cause cross-contamination, and ensuring that the gas-fired boiler works normally and stably.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Additional aspects and advantages of this invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a perspective view of the flue structure of the gas-fired heating boiler of this utility model;

[0019] Figure 2 This is a cross-sectional view of the flue structure of the gas-fired heating furnace of this utility model;

[0020] Figure 3 This is an exploded view of the flue structure of the gas-fired heating boiler of this utility model;

[0021] Figure 4 This is a schematic diagram of the flue structure of the gas-fired heating furnace of this utility model;

[0022] Figure 5 yes Figure 4 A magnified view of a portion of region A in the middle.

[0023] Figure 6 This is a perspective view of the support ring in this utility model.

[0024] Figure label:

[0025] Outer tube 100, outer bend 110, first through-pipe section 111 of outer bend, first sealing ring fixing groove of outer tube 112, second through-pipe section of outer bend 113, corrugated bend of outer bend 114, outer straight tube 120, first through-pipe section of outer straight tube 121, plug of outer straight tube 122, air inlet 123, first sealing ring of outer tube 130, second sealing ring of outer tube 140; inner tube 200, inner bend 210, first through-pipe section of inner bend 211 The inner layer bend second through-pipe section 212, inner layer bend corrugated bend section 213, inner layer straight pipe 220, inner layer straight pipe first through-pipe section 221, inner layer straight pipe first through-pipe protrusion ring 222, inner layer straight pipe plug 223, vent hole 224, inner layer pipe first sealing ring 230, inner layer pipe second sealing ring 240; first support ring 300, straight edge 310, inner support section 311, support corner position 320, arc surface 321, outer support section 322, second support ring 330. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of this utility model, "multiple" means two or more, and "greater than," "less than," "exceeding," etc., are understood to exclude the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0029] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0030] The following is for reference. Figure 1 and Figure 2 The flue structure of a gas-fired heating furnace according to an embodiment of the present utility model is described.

[0031] like Figure 1 and Figure 2 As shown, the flue structure of the gas-fired heating furnace according to an embodiment of the present invention includes an outer tube 100, an inner tube 200, and a first support ring 300.

[0032] Reference Figure 3 , Figure 4 The outer tube 100 has a cavity; the inner tube 200 is located inside the outer tube 100, and a space is left between the inner wall of the outer tube 100 and the outer wall of the inner tube 200 as an air intake channel. The inner tube 200 includes an inner bend 210, an inner straight tube 220, and an inner tube first sealing ring 230. The front side of the upper side of the inner bend 210 has an inner bend first through-pipe section 211, and the rear side of the inner straight tube 220 has an inner straight tube first through-pipe section 221. The inner bend first through-pipe section 211 and the inner straight tube 220 are connected. The first through-pipe section 221 is connected to the inner tube, and the first sealing ring 230 of the inner tube is located between the first through-pipe section 211 of the inner tube bend and the first through-pipe section 221 of the inner tube straight section; the first support ring 300 is located between the inner side wall of the outer tube 100 and the outer side wall of the inner tube 200. The outer side wall of the first support ring 300 has an outer support portion 322, and the inner side wall of the first support ring 300 has an inner support portion 311. The outer support portion 322 is locked onto the inner side wall of the outer tube 100, and the inner support portion 311 is locked onto the outer side wall of the inner tube 200.

[0033] For example, such as Figure 1 and Figure 2 As shown, the outer tube 100 has a cavity. (Refer to...) Figure 3 , Figure 4 The inner tube 200 is located inside the outer tube 100. A space is left between the inner wall of the outer tube 100 and the outer wall of the inner tube 200 as an air intake passage, while the inner cavity of the inner tube 200 serves as an exhaust passage. The inner tube 200 includes an inner bend 210, an inner straight tube 220, and an inner tube first sealing ring 230. The upper front side of the inner bend 210 has an inner bend first through-pipe portion 211, and the rear side of the inner straight tube 220 has an inner straight tube first through-pipe portion 221, which are connected. The inner tube first sealing ring 230 is located between the inner bend first through-pipe portion 211 and the inner straight tube first through-pipe portion 221. A first support ring 300 is located between the inner wall of the outer tube 100 and the outer wall of the inner tube 200. The outer side wall of the first support ring 300 has an outer support portion 322, and the inner side wall of the first support ring 300 has an inner support portion 311. The outer support portion 322 locks the inner side wall of the outer tube 100, and the inner support portion 311 locks the outer side wall of the inner tube 200.

[0034] During installation, the inner tube 200 is located inside the outer tube 100. The inner bend 210 connects to the inner straight tube 220, and the first sealing ring 230 of the inner tube ensures a tight seal between the inner bend 210 and the inner straight tube 220. The first support ring 300, located between the inner wall of the outer tube 100 and the outer wall of the inner tube 200, serves to fix the outer tube 100 and the inner tube 200, ensuring that the connection between the inner bend 210 and the inner straight tube 220 will not loosen.

[0035] In practical work, refer to Figure 4 Fresh air from the outside enters the outer tube 100, passing through the intake channel between the inner wall of the outer tube 100 and the outer wall of the inner tube 200 before entering the gas-fired boiler. Exhaust gas generated during boiler operation is discharged through the exhaust channel within the inner tube 200. This structure ensures that exhaust gas will not enter the intake channel through the gap between the inner bend tube 210 and the inner straight tube 220, preventing cross-contamination and ensuring the normal and stable operation of the gas-fired boiler.

[0036] In some embodiments of this utility model, reference is made to Figure 3 , Figure 4 The outer tube 100 includes an outer bend 110, an outer straight tube 120, and an outer tube first sealing ring 130. The outer bend 110 has a first through-pipe portion 111 on its upper front side, and the outer straight tube 120 has a first through-pipe portion 121 on its rear side. The first through-pipe portion 111 of the outer bend 110 is connected to the first through-pipe portion 121 of the outer straight tube. The first sealing ring 130 is located between the first through-pipe portion 111 of the outer bend 110 and the first through-pipe portion 121 of the outer straight tube. The outer bend 110 and the outer straight tube 120 are connected to form the outer tube 100, and the first sealing ring 130 ensures the sealing of the connection between the outer bend 110 and the outer straight tube 120.

[0037] In some embodiments of this utility model, reference is made to Figure 4 , Figure 5 The outer straight pipe first through-pipe section 121 is inserted into the outer bend pipe first through-pipe section 111. The inner wall of the outer bend pipe first through-pipe section 111 is provided with an outer pipe first sealing ring fixing groove 112, and the outer pipe first sealing ring 130 is located in the outer pipe first sealing ring fixing groove 112. The outer pipe first sealing ring fixing groove 112 is used to fix the outer pipe first sealing ring 130, ensuring that the outer pipe first sealing ring 130 will not loosen or misalign, so as to ensure the sealing of the connection between the outer bend pipe 110 and the outer straight pipe 120.

[0038] In some embodiments of this utility model, the outer straight pipe 120 has an outer straight pipe plug 122 at its front end, and an air inlet 123 is provided on the side wall of the front end of the outer straight pipe 120. The air inlet 123 on the side wall of the front end of the outer straight pipe 120 ensures higher air intake efficiency. The inner pipe 200 extends forward through the outer straight pipe plug 122, and the inner straight pipe 220 has an inner straight pipe plug 223 at its front end. An exhaust port 224 is provided on the side wall of the front end of the inner straight pipe 220. The exhaust port 224 on the side wall of the front end of the inner straight pipe 220 ensures higher exhaust efficiency. The aforementioned air inlet 123 and exhaust port 224 are staggered to ensure that air intake and exhaust do not interfere with each other.

[0039] In some embodiments of this utility model, the lower side of the outer bend 110 has an outer bend second through-pipe portion 113, and the inner wall of the outer bend second through-pipe portion 113 is provided with an outer pipe second sealing ring 140. The outer bend second through-pipe portion 113 is connected to the air inlet of the heating furnace. The outer pipe second sealing ring 140 is located between the outer bend second through-pipe portion 113 and the air inlet of the heating furnace to ensure that there is no leakage when the heating furnace is intake.

[0040] In some embodiments of this utility model, the outer bend 110 includes an outer bend corrugated bending portion 114, and the corrugated design of the outer bend corrugated bending portion 114 can be bent to adjust the angle.

[0041] In some embodiments of this utility model, the first through-pipe section 221 of the inner straight pipe is inserted into the first through-pipe section 211 of the inner curved pipe. An inner straight pipe first through-pipe protrusion 222 is provided on the outer wall of the inner straight pipe first through-pipe section 221, and an inner pipe first sealing ring 230 is sleeved on the inner straight pipe first through-pipe protrusion 222. The inner straight pipe first through-pipe protrusion 222 is used to fix the inner pipe first sealing ring 230, ensuring that the inner pipe first sealing ring 230 will not loosen or become misaligned.

[0042] In some embodiments of this utility model, the lower side of the inner bend 210 has an inner bend second through-pipe portion 212, and the inner wall of the inner bend second through-pipe portion 212 is provided with an inner pipe second sealing ring 240. The inner bend second through-pipe portion 212 is connected to the exhaust port of the heating furnace. The inner pipe second sealing ring 240 is located between the inner bend second through-pipe portion 212 and the exhaust port of the heating furnace to ensure that there is no leakage when the heating furnace exhausts.

[0043] In some embodiments of this utility model, the inner bend 210 includes an inner bend corrugated bending portion 213, and the corrugated design of the inner bend corrugated bending portion 213 can be bent to adjust the angle.

[0044] In some embodiments of this utility model, reference is made to Figure 5 , Figure 6It also includes a second support ring 330, that is, the support ring structure includes at least a first support ring 300 and a second support ring 330. The first support ring 300 is located between the inner rear wall of the outer straight pipe 120 and the outer rear wall of the inner straight pipe 220, and the second support ring 330 is located between the inner lower wall of the outer bent pipe 110 and the outer lower wall of the inner bent pipe 210, to ensure that the outer pipe 100 and the inner pipe 200 are sufficiently stable.

[0045] In some embodiments of this utility model, reference is made to Figure 6 The first support ring 300 has a polygonal annular structure, including straight edges 310 and support corner positions 320 between the straight edges 310. An inner support portion 311 is located on the straight edge 310, and an outer support portion 322 is located on the support corner position 320. The straight edges 310 designed above are elastic, ensuring that the inner support portion 311 on the straight edge 310 can clamp the inner tube 200, and that the outer support portion 322 on the support corner position 320 can abut against the outer tube 100.

[0046] In some embodiments of this utility model, the second support ring 330 has the same shape as the first support ring 300.

[0047] In some embodiments of this utility model, the support corner position 320 has an arc-shaped surface 321, and the outer support part 322 is located on the arc-shaped surface 321, which can prevent the outer support part 322 from puncturing the outer tube 100 and causing the outer tube 100 to leak air.

[0048] The gas water heater according to the second aspect of the present invention includes the gas boiler flue structure according to the first aspect of the present invention, that is, the gas boiler flue structure can also be applied to the gas water heater.

[0049] According to the embodiments of the present utility model, the electrical appliance adopts the above-mentioned gas-fired boiler flue structure to achieve an integrated design of air intake and exhaust, which facilitates the miniaturization and integration of the electrical appliance's ventilation, and can also improve the air intake and exhaust effect and enhance the stability of gas combustion performance.

[0050] Other components and operations of the gas operation according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0051] The following is for reference. Figure 1 and Figure 2 The flue structure of a gas-fired boiler according to an embodiment of the present invention is described in detail below with reference to a specific example. It is to be understood that the following description is merely illustrative and not intended to limit the scope of the invention.

[0052] like Figure 1 and Figure 2As shown, the flue structure of the gas-fired heating furnace in this embodiment of the present invention includes an outer tube 100, an inner tube 200, a first support ring 300, and a second support ring 330.

[0053] The outer tube 100 includes an outer bend 110, an outer straight tube 120, a first sealing ring 130, and a second sealing ring 140. The outer bend 110 includes a first through-pipe section 111, a first sealing ring fixing groove 112, a second through-pipe section 113, and a corrugated bend section 114. The outer straight tube 120 includes a first through-pipe section 121, a plug 122, and an air inlet 123.

[0054] The inner tube 200 includes an inner bend 210, an inner straight tube 220, a first sealing ring 230, and a second sealing ring 240. The inner bend 210 includes a first through-pipe section 211, a second through-pipe section 212, and a corrugated bend section 213. The inner straight tube 220 includes a first through-pipe section 221, a first through-pipe protrusion 222, a plug 223, and a vent 224.

[0055] The first support ring 300 and the second support ring 330 are respectively located between the inner rear wall of the outer straight pipe 120 and the outer rear wall of the inner straight pipe 220, and between the inner lower wall of the outer curved pipe 110 and the outer lower wall of the inner curved pipe 210. The first support ring 300 includes a straight edge 310, an inner support portion 311, a support corner 320, an arc-shaped surface 321, and an outer support portion 322. The second support ring 330 has the same shape as the first support ring 300.

[0056] According to the flue structure of the gas-fired boiler according to the embodiment of this utility model, by such arrangement, at least the following effects can be achieved: the outer tube 100 and the inner tube 200 are combined to form an integrated air intake and exhaust structure. Fresh air from the outside enters the outer tube 100, and the intake air enters the gas-fired boiler through the air intake channel between the inner side wall of the outer tube 100 and the outer side wall of the inner tube 200. The exhaust gas generated by the gas-fired boiler during operation is discharged to the outside through the exhaust channel in the inner tube 200; the inner tube has a first seal. Ring 230 ensures the sealing effect of the connection gap between the inner bend 210 and the inner straight pipe 220; the first support ring 300 is located between the inner wall of the outer pipe 100 and the outer wall of the inner pipe 200, which plays a role in fixing the outer pipe 100 and the inner pipe 200, preventing the connection between the inner bend 210 and the inner straight pipe 220 from moving, ensuring that exhaust gas will not enter the air intake channel from the gap between the inner bend 210 and the inner straight pipe 220 and cause cross-contamination, and ensuring that the gas heating boiler works normally and stably.

[0057] In the description of this specification, references to terms such as "some embodiments" or "as one might imagine" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0058] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A flue structure for a gas-fired heating boiler, characterized in that, include: An outer tube (100) having a cavity; An inner tube (200) is located inside the outer tube (100). A space is left between the inner wall of the outer tube (100) and the outer wall of the inner tube (200) as an air intake channel. The inner tube (200) includes an inner bend (210), an inner straight tube (220), and an inner tube first sealing ring (230). The front side of the upper side of the inner bend (210) has an inner bend first through-pipe section (211), and the rear side of the inner straight tube (220) has an inner straight tube first through-pipe section (221). The inner bend first through-pipe section (211) is connected to the inner straight tube first through-pipe section (221). The inner tube first sealing ring (230) is located between the inner bend first through-pipe section (211) and the inner straight tube first through-pipe section (221). The first support ring (300) is located between the inner wall of the outer tube (100) and the outer wall of the inner tube (200). The airflow in the air intake channel can pass through the first support ring (300). The outer wall of the first support ring (300) has an outer support portion (322), and the inner wall of the first support ring (300) has an inner support portion (311). The outer support portion (322) locks the inner wall of the outer tube (100), and the inner support portion (311) locks the outer wall of the inner tube (200).

2. The flue pipe structure of the gas-fired heating boiler according to claim 1, characterized in that, The outer tube (100) includes an outer bend (110), an outer straight tube (120), and an outer tube first sealing ring (130). The upper front side of the outer bend (110) has an outer bend first through-pipe section (111), and the rear side of the outer straight tube (120) has an outer straight tube first through-pipe section (121). The outer bend first through-pipe section (111) is connected to the outer straight tube first through-pipe section (121), and the outer tube first sealing ring (130) is located between the outer bend first through-pipe section (111) and the outer straight tube first through-pipe section (121).

3. The flue pipe structure of the gas-fired heating boiler according to claim 2, characterized in that, The first through-pipe section (121) of the outer straight pipe is inserted into the first through-pipe section (111) of the outer bent pipe. The inner side wall of the first through-pipe section (111) of the outer bent pipe is provided with a first sealing ring fixing groove (112) of the outer pipe. The first sealing ring (130) of the outer pipe is located in the first sealing ring fixing groove (112) of the outer pipe.

4. The flue pipe structure of the gas-fired heating boiler according to claim 2, characterized in that, The outer straight pipe (120) is provided with an outer straight pipe plug (122) at its front end, and an air inlet (123) is provided on the side wall of the front end of the outer straight pipe (120). The inner pipe (200) extends forward through the outer straight pipe plug (122), and the inner straight pipe (220) is provided with an inner straight pipe plug (223) at its front end. An exhaust hole (224) is provided on the side wall of the front end of the inner straight pipe (220).

5. The flue pipe structure of the gas-fired heating boiler according to claim 2, characterized in that, The outer bend (110) has a second pipe section (113) on its lower side. The inner wall of the second pipe section (113) is provided with a second sealing ring (140). The second pipe section (113) is connected to the air inlet of the heating furnace. The second sealing ring (140) is located between the second pipe section (113) and the air inlet of the heating furnace.

6. The flue pipe structure of the gas-fired heating boiler according to claim 1, characterized in that, The first through-pipe section (221) of the inner straight pipe is inserted into the first through-pipe section (211) of the inner bent pipe. The outer wall of the first through-pipe section (221) of the inner straight pipe is provided with a first through-pipe ring (222) of the inner straight pipe. The first sealing ring (230) of the inner pipe is sleeved on the first through-pipe ring (222) of the inner straight pipe.

7. The flue pipe structure of the gas-fired boiler according to claim 1, characterized in that, The inner bend (210) has a second pipe section (212) on its lower side. The inner wall of the second pipe section (212) is provided with a second sealing ring (240). The second pipe section (212) is connected to the exhaust port of the heating furnace. The second sealing ring (240) is located between the second pipe section (212) and the exhaust port of the heating furnace.

8. The flue structure of the gas-fired boiler according to claim 2, characterized in that, It also includes a second support ring (330). The first support ring (300) is located between the inner rear wall of the outer straight pipe (120) and the outer rear wall of the inner straight pipe (220). The second support ring (330) is located between the inner lower wall of the outer curved pipe (110) and the outer lower wall of the inner curved pipe (210). The airflow in the air intake channel can pass through the first support ring (300) and the second support ring (330).

9. The flue pipe structure of the gas-fired heating boiler according to claim 1, characterized in that, The first support ring (300) is a polygonal ring structure. The first support ring (300) includes straight sides (310), and support corner positions (320) are provided between the straight sides (310). The inner support part (311) is located on the straight side (310), and the outer support part (322) is located on the support corner position (320).

10. The flue pipe structure of the gas-fired heating boiler according to claim 9, characterized in that, The supporting corner (320) has an arc-shaped surface (321), and the outer supporting part (322) is located on the arc-shaped surface (321).

Images