A water-cooled burner and condensing boiler

Abstract

The present invention provides a water-cooled burner and a condensing boiler. The water-cooled burner includes a tubular body and a fluid box connected to both ends of the tubular body. The tubular body includes an inner tube and multiple outer tubes. The inner tube extends along the central axis and has a mixing chamber. The inner tube is provided with multiple rows of openings. The multiple outer tubes are arranged in parallel and wound around the outer side of the inner tube, and the length direction of the multiple outer tubes is consistent with the central axis direction of the inner tube. The fluid box has a fluid inlet and a fluid outlet, and the fluid inlet and the fluid outlet are respectively connected to the multiple outer tubes. The burner of the present invention is not easy to cause blockage, has a good heat exchange effect, and can reduce the nitrogen oxide content in the flue gas.

Description

Technical Field

[0001] The invention relates to the technical field of boilers, and in particular to a water-cooled burner and a condensing boiler. Background Art

[0002] Condensing boilers are highly efficient, energy-saving and environmentally friendly, and are the development direction of the boiler industry. At present, the technology of small condensing boilers or gas condensing water heaters has gradually matured.

[0003] The burner requires a large amount of air when burning, and the air contains a large amount of impurities. Existing condensing boilers mostly use surface-type metal fiber mesh structure burners, whose surface is mesh-shaped. The existing surface-type burners can filter the air entering the burner through the metal mesh wrapped on the surface, and can make the mixed gas evenly distributed. At the same time, it has a certain anti-backfire function. However, the existing burners are prone to blockage on the burner surface, and need to be replaced and cleaned frequently, which is time-consuming and labor-intensive. Once blocked, the boiler output will be greatly reduced, and it is easy to cause damage to the burner. In severe cases, it may even cause safety hazards such as deflagration.

[0004] Therefore, it is necessary to provide a new technical solution. Summary of the invention

[0005] In order to solve the technical problems existing in the prior art, the present invention discloses a water-cooled burner and a condensing boiler. The specific technical scheme is as follows:

[0006] In one aspect, the present invention provides a water-cooled burner, comprising a tubular body and a fluid box connected to both ends of the tubular body, wherein the tubular body comprises an inner tube and a plurality of outer tubes.

[0007] The inner tube extends along the central axis and has a mixing chamber. The inner tube is provided with multiple rows of openings. The multiple outer tubes are arranged in parallel and wound around the outer side of the inner tube, and the length direction of the multiple outer tubes is consistent with the central axis direction of the inner tube.

[0008] The fluid box has a fluid inlet, a fluid outlet and an air inlet. The fluid inlet and the fluid outlet are respectively communicated with a plurality of external tubes, and the air inlet is communicated with the mixing chamber.

[0009] Furthermore, the axial direction of the multiple rows of openings is consistent with the central axial direction of the inner tube, two adjacent rows of openings are staggered and arranged at equal intervals, and each row of openings includes a plurality of openings.

[0010] Two adjacent outer tubes are arranged at equal intervals.

[0011] The multiple outer tubes correspond to the multiple rows of openings one by one, the vertical center line of each row of openings coincides with the radial direction of each corresponding outer tube, and there is a gap between each row of openings and each corresponding outer tube.

[0012] Furthermore, there is a gap between two adjacent outer tubes;

[0013] There is a gap between each row of openings and each corresponding outer tube.

[0014] Furthermore, the fluid box at one end of the tubular body has a fluid inlet, a fluid outlet and a partition for separating the fluid inlet and the fluid outlet, the fluid inlet and the fluid outlet are respectively connected to multiple external tubes, and the fluid box at the other end of the tubular body has an air inlet, which is connected to the mixing chamber.

[0015] Furthermore, the outer tube is a stainless steel light tube, the outer diameter of the light tube is 15-40 mm, the wall thickness of the light tube is 1.0-3.0 mm, and along the cross-sectional direction of the tubular body, multiple light tubes form a ring structure.

[0016] Furthermore, the outer tube is a stainless steel fin tube, and the fin tube comprises an inner tube and a plurality of fins arranged outside the inner tube.

[0017] Two adjacent fin tubes are arranged at equal intervals, a partition plate is arranged between the two adjacent fin tubes, the length of the partition plate is consistent with the length of the fin of the fin tube, there is a gap between the two adjacent partition plates, and each gap corresponds to each row of openings in the inner tube.

[0018] Furthermore, the partition plate includes a U-shaped trough body, the length of the U-shaped trough body is consistent with the length of the partition plate, and a connecting plate extends outward from the opening of the U-shaped trough body along the length direction of the U-shaped trough body. The U-shaped trough body is inserted between two adjacent fin tubes, and the notch of the U-shaped trough body faces the inner tube, and the connecting plate is close to the inner tube.

[0019] Furthermore, the outer diameter of the fin tube is 15-40 mm, the wall thickness of the fin tube is 1.0-3.0 mm, and along the cross-sectional direction of the tubular body, a plurality of fin tubes form a ring structure.

[0020] Furthermore, the tubular body also includes an annular rib plate, the rib plate is sleeved on the outer side of the inner tube, a receiving groove is formed on the rib plate, and the outer tube extends along the central axis through the receiving groove.

[0021] On the other hand, the present invention further provides a condensing boiler, which includes the water-cooled burner described in the above aspect.

[0022] The present invention has the following beneficial effects:

[0023] 1. The water-cooled burner provided by the present invention is a tubular structure. Taking the 1050 kW water-cooled burner of the present invention as an example, the flame area in the mixing chamber of the burner can reach 1.035 m2 , which can effectively radiate the heat exchange area, reduce the combustion intensity per unit area, and improve the operating conditions of the burner.

[0024] 2. The water-cooled burner provided by the present invention has uniform heat release during combustion, and a circulating water pipe is arranged at the root of the flame, which effectively reduces the flame temperature and the probability of nitrogen oxide generation, and the nitrogen oxide content generated by combustion is low.

[0025] 3. The water-cooled burner provided by the present invention comprises an inner tube and an outer tube. The inner tube serves as an airflow distribution tube. The inner tube has a certain number of openings. The diameter of a single opening of the inner tube is 2-4 mm. The opening area is reasonable, and the airflow distribution in the tube is reasonably distributed, thereby ensuring uniform flame distribution on the burner surface and improving combustion efficiency. The outer tube serves as a water pipe, which can reduce the temperature of the flame, thereby reducing the content of nitrogen oxides in the flue gas.

[0026] 4. The water-cooled burner provided by the present invention has an inner diameter of a water pipe of 15-40 mm. The inside of the water pipe is not easily clogged and does not need to be replaced and cleaned regularly, thereby improving the stability of boiler operation. The water pipe spacing is large enough to avoid clogging and has high safety performance. Therefore, there is no need to replace the burner regularly, thereby ensuring the stability of boiler output.

[0027] 5. The water-cooled burner provided by the present invention can not only fix and strengthen the inner tube and the outer tube, but also control the distance between the inner tube and the outer tube by sleeved ribs on the outer side of the inner tube.

[0028] 6. The water pipe of the water-cooled burner provided by the present invention is made of stainless steel, which can prevent corrosion from acidic condensed water. The stainless steel material is strong and can meet the harsh working environment in the furnace.

[0029] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 is a schematic structural diagram of a water-cooled burner provided in an embodiment of the present invention;

[0032] Figure 2 is a schematic structural diagram of a water-cooled burner provided in an embodiment of the present invention;

[0033] Figure 3 yes Figure 1 A schematic diagram of the main view;

[0034] Figure 4 yes Figure 3 A-direction cross-sectional schematic diagram;

[0035] Figure 5 yes Figure 3 A schematic cross-sectional view in the direction of B;

[0036] Figure 6 yes Figure 3 A schematic cross-sectional view in the direction of D;

[0037] Figure 7 yes Figure 3 E-direction cross-sectional schematic diagram;

[0038] Figure 8 yes Figure 7 A magnified schematic diagram of part F;

[0039] Fig. 9 yes Figure 1 An enlarged schematic diagram of the C portion;

[0040] Fig.10 yes Figure 6 Schematic diagram of the enlarged G part;

[0041] Fig.11 is a schematic structural diagram of a water-cooled burner provided by another embodiment of the present invention;

[0042] Fig.12 yes Fig.11 H-direction cross-sectional view;

[0043] Fig.13 yes Fig.12 Enlarged view of Part II.

[0044] Among them, 1-tubular body, 11-inner tube, 111-opening, 112-mixing chamber, 12-outer tube, 13-rib plate, 131-receiving tank, 2-fluid box, 20a-front water tank, 20b-rear water tank, 21-fire viewing hole, 22-fluid inlet, 23-fluid outlet, 24-partition plate, 25-air inlet, 121-fin tube, 1211-inner tube, 1212-fin, 14-partition plate, 141-U-shaped trough body, 142-connecting plate. DETAILED DESCRIPTION

[0045] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0046] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, fixed connection, detachable connection, or integrated; mechanical connection, or electrical connection; direct connection, or indirect connection through an intermediate medium, or internal connection between two elements or interaction between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Example

[0049] The present invention provides a water-cooled burner, comprising a tubular body 1 and a fluid box 2 connected to both ends of the tubular body 1. The tubular body 1 comprises an inner tube 11 and a plurality of outer tubes 12 located outside the inner tube.

[0050] The inner cylinder 11 extends along the central axis and has an inner surface and an outer surface. The inner surface forms a mixing chamber 112 . The inner cylinder has multiple rows of openings 111 .

[0051] The wall thickness of the inner tube 11 is 0.2-0.8 mm, preferably, the wall thickness of the inner tube 11 is 0.8 mm, and the inner diameter of the inner tube 11 will be reasonably matched and determined according to the size of the furnace. In the example, the wall thickness of the inner tube 11 is 0.8 mm, and the inner diameter of the inner tube 11 is 200 mm.

[0052] The axial direction of the multiple rows of openings 111 is consistent with the axial direction of the inner tube 11. Two adjacent rows of openings 111 are staggered and arranged at equal intervals, and each row of openings 111 includes multiple openings 111. The multiple openings 111 can also be arranged at equal intervals.

[0053] In a preferred embodiment, the shapes of the plurality of openings 111 include but are not limited to oval holes and / or round holes. The oval holes and the round holes are alternately arranged at equal intervals, and the opening direction of the oval holes is consistent with the central axis direction of the inner cylinder 11.

[0054] Furthermore, the opening direction of the oblong hole is consistent with the axial direction of the inner tube 11 .

[0055] The water-cooled burner provided by the present invention has an inner cylinder as an airflow distribution cylinder, the inner cylinder has a certain number of openings, the diameter of a single opening of the inner cylinder is 2-4 mm, the opening area is reasonable, the airflow distribution in the cylinder is reasonably distributed, the flame distribution on the burner surface is ensured to be uniform, and the combustion efficiency is improved.

[0056] The plurality of outer tubes 12 are arranged in parallel and wound around the outer side of the inner tube 11 , and the length direction of the plurality of outer tubes 12 is consistent with the central axis direction of the inner tube 11 .

[0057] Furthermore, two adjacent outer tubes 12 are arranged at equal intervals. Preferably, there is a gap between the two adjacent outer tubes 12. In the example, the gap between the two adjacent outer tubes 12 is 3-5 mm. Preferably, the gap between the two adjacent outer tubes 12 is 5 mm.

[0058] The multiple outer tubes 12 correspond to the multiple rows of openings 111 one by one, the number of rows of openings 111 of the inner tube 11 is consistent with the number of outer tubes 12, the vertical center line of each row of openings 111 coincides with the radial direction of each corresponding outer tube 12, and there is a gap between each row of openings 111 and each corresponding outer tube 12, and the gap between each row of openings 111 and each corresponding outer tube 12 is 3-5mm. Preferably, the gap between each row of openings 111 and each corresponding outer tube 12 is 5mm, so that the mixed gas passing through the openings 111 can be evenly distributed to the outside or side of the outer tube 12, so that the heat exchange of the outer tube 12 can be more uniform and efficient.

[0059] The outer tube 12 is used as a water pipe and is arranged at the root of the flame, which can effectively reduce the temperature of the flame and thus reduce the content of nitrogen oxides in the flue gas.

[0060] In this embodiment, the outer tube 12 is a stainless steel light tube, and a plurality of light tubes form a ring structure, and its specific size is determined by matching the size of the boiler furnace. The outer diameter of the light tube is 15-40 mm, and the wall thickness of the light tube is 1.0-3.0 mm. The length of the light tube is 800-1500 mm, and the inner diameter of the ring structure formed by multiple light tubes is 150-300 mm. The length of the light tube in the example is 950 mm, and the outer diameter of the light tube is 20 mm. The inner diameter of the ring structure formed by multiple light tubes in the example is 210 mm.

[0061] The water-cooled burner provided by the present invention has a water pipe with an inner diameter of 15-40 mm. The inside of the water pipe is not easy to be blocked and does not need to be replaced and cleaned regularly, thereby improving the stability of boiler operation. The water pipe spacing is large enough not to cause blockage and has high safety performance. Therefore, there is no need to replace the burner regularly, thereby ensuring the stability of boiler output. The water pipe is made of stainless steel material, which can prevent corrosion from acidic condensed water. The stainless steel material has high strength and can meet the harsh working environment in the furnace.

[0062] In one embodiment, the tubular body 1 further comprises an annular rib 13, the rib 13 is sleeved on the outer side of the inner tube 11, the rib 13 is provided with a receiving groove 131, and the outer tube 12 extends along the central axis through the receiving groove 131. The rib of the present invention can fix and strengthen the inner tube 11 and the outer tube 12, and can control the distance between the inner tube 11 and the outer tube 12.

[0063] In this embodiment, the fluid box at one end of the tubular body 1 has a fluid inlet 22, a fluid outlet 23 and a partition 24, and the partition 24 is connected between the fluid inlet 22 and the fluid outlet 23. The fluid box 2 at the other end of the tubular body 1 has an air inlet 25, and the air inlet 25 is connected to the mixing chamber 112.

[0064] Specifically, the fluid box 2 includes a front water box 20a and a rear water box 20b, and the rear water box 20b has a fluid inlet 22, a fluid outlet 23 and a partition 24. The fluid inlet 22 and the fluid outlet 23 are respectively connected to the plurality of outer tubes 12, and the outer tubes 12 are divided into two processes of water inlet and water outlet through the partition 24. The fluid such as water flows into the outer tube 12 from the fluid inlet 22, and the water flows at least twice (two return trips) between the outer tubes, and then flows out from the fluid outlet 23.

[0065] It should be noted that, by providing a partition 24 in the rear water tank 20b, the outer pipe 12 can be divided into a plurality of flows, and the water flow can be flexibly adjusted according to actual conditions.

[0066] The front water tank 20a has an air inlet 25, which is connected to the mixing chamber 112. The gas (fuel gas and air) delivered by the external fan or mixer enters the mixing chamber 112 through the air inlet 25, and after being distributed by the inner tube 11, it burns outside the outer tube 12 or on the side of the outer tube 12. At this time, the water flow in the outer tube 12 cools the combustion flame, thereby reducing the nitrogen oxide content generated by the combustion. In one embodiment, the external fan or mixer is connected to the fluid box through a screw.

[0067] The front water tank 20 a also has a fire viewing hole 21 and is used to install an electronic igniter there. Through the fire viewing hole 21 , the burning situation outside the outer tube 12 or on the side of the outer tube 12 can be observed.

[0068] In another embodiment, the fluid box 2 at one end of the tubular body 1 has a fluid inlet 22, and the fluid box 2 at the other end of the tubular body 1 has a fluid outlet 23. The fluid, such as water, enters all the outer tubes 12 from the fluid inlet 22, and the water flows once (one-way) between the outer tubes 12 and then flows out from the fluid outlet 23.

[0069] The fluid box of the present invention is connected to the tubular body by welding.

[0070] Example

[0071] See also Figures 11 to 13 , Fig.11 is a schematic structural diagram of a water-cooled burner provided by another embodiment of the present invention; Fig.12 yes Fig.11 H-direction cross-sectional view; Fig.13 yes Fig.12 Enlarged view of Part II.

[0072] In this embodiment, the outer tube 12 is a stainless steel fin tube, the outer diameter of the fin tube is 15-40 mm, the wall thickness of the fin tube is 1.0-3.0 mm, and the fin width is 2-10 mm.

[0073] Along the cross-sectional direction of the tubular body 1, multiple finned tubes form an annular structure, and the inner diameter of the annular structure formed by the multiple finned tubes will be determined by matching according to the size of the heat exchanger furnace. In the example, the inner diameter of the tube ring formed by the finned tubes is 300 mm. In the example, the length of the finned tube is 950 mm, and the length and number of the finned tubes and the inner diameter of the annular structure surrounded by the multiple finned tubes will be determined by matching according to the size of the heat exchanger furnace.

[0074] In the example, the outer diameter of the fin tube is 20 mm, the wall thickness of the fin tube is 1.2 mm, the length of the fin tube is 950 mm, and the fin width is 8.5 mm.

[0075] The fin tube 121 includes an inner tube 1211 and a plurality of fins 1212 disposed outside the inner tube, and the plurality of fins 1212 are adjacently disposed at equal intervals.

[0076] Two adjacent fin tubes 121 are arranged at equal intervals, and a partition plate 14 is arranged between the two adjacent fin tubes 121. The length of the partition plate 14 is consistent with the length of the fin of the fin tube 121. There is a gap between the two adjacent partition plates 14, and each gap corresponds to each row of openings 111 one by one.

[0077] The partition plate 14 includes a U-shaped groove body 141, the length of which is consistent with the length of the partition plate 14, and a connecting plate 142 extends outward from the opening of the U-shaped groove body 141 along the length direction of the U-shaped groove body 141. The U-shaped groove body 141 is inserted between two adjacent fin tubes 121, and the notch of the U-shaped groove body 141 faces the inner tube 11, and the connecting plate 142 is close to the inner tube 11.

[0078] Preferably, the connecting plate 142 is vertically connected to the U-shaped trough body 141 .

[0079] Please continue reading Fig.13 , Fig.13 The arrow in the figure points to the direction of the flue gas generated by the burner. Specifically, the flue gas generated by the burner is distributed through the opening 111 of the inner tube 11. A part of the flue gas distributed through the inner tube passes through the gap between the two partition plates and enters the gap between two adjacent fins, thereby performing heat exchange on the water flow in the inner tube of the fin tube, thereby reducing the flue gas temperature and the content of nitrogen oxides in the flue gas.

[0080] The wall thickness of the inner tube 11 is 0.2-0.8 mm, and the wall thickness of the inner tube 11 is 0.8 mm.

[0081] Example

[0082] The present invention also provides a condensing boiler, characterized in that it comprises the above-mentioned water-cooled burner.

[0083] The present invention has the following beneficial effects:

[0084] 1. The water-cooled burner provided by the present invention is a tubular structure. Taking the 1050 kW water-cooled burner of the present invention as an example, the flame area in the mixing chamber of the burner can reach 1.035 m 2 , which can effectively radiate the heat exchange area, reduce the combustion intensity per unit area, and improve the operating conditions of the burner.

[0085] 2. The water-cooled burner provided by the present invention has uniform heat release during combustion, and a circulating water pipe is arranged at the root of the flame, which effectively reduces the flame temperature and the probability of nitrogen oxide generation, and the nitrogen oxide content generated by combustion is low.

[0086] 3. The water-cooled burner provided by the present invention comprises an inner tube and an outer tube. The inner tube serves as an airflow distribution tube. The inner tube has a certain number of openings. The diameter of a single opening of the inner tube is 2-4 mm. The total area of ​​the openings is reasonable, and the airflow distribution in the tube is reasonably distributed, thereby ensuring uniform flame distribution on the burner surface and improving combustion efficiency. The outer tube serves as a water pipe, which can reduce the temperature of the flame, thereby reducing the content of nitrogen oxides in the flue gas.

[0087] 4. The water-cooled burner provided by the present invention has an inner diameter of a water pipe of 15-40 mm. The inside of the water pipe is not easily clogged and does not need to be replaced and cleaned regularly, thereby improving the stability of boiler operation. The water pipe spacing is large enough to avoid clogging and has high safety performance. Therefore, there is no need to replace the burner regularly, thereby ensuring the stability of boiler output.

[0088] 5. The water-cooled burner provided by the present invention can not only fix and strengthen the inner tube and the outer tube, but also control the distance between the inner tube and the outer tube by sleeved ribs on the outer side of the inner tube.

[0089] 6. The water pipe of the water-cooled burner provided by the present invention is made of stainless steel, which can prevent corrosion from acidic condensed water. The stainless steel material is strong and can meet the harsh working environment in the furnace.

[0090] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0091] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify and vary the above embodiments within the scope of the present invention.

Claims

1. A water-cooled burner, characterized in that: The invention comprises a tubular body (1) and a fluid box (2) connected to both ends of the tubular body, wherein the tubular body (1) comprises an inner tube (11) and a plurality of outer tubes (12), wherein the outer tubes (12) are stainless steel plain tubes or stainless steel finned tubes (121). The inner cylinder (11) extends along a central axis and has a mixing chamber (112). The inner cylinder (11) is provided with a plurality of rows of openings (111). The axial directions of the plurality of rows of openings (111) are consistent with the central axis direction of the inner cylinder (11). Two adjacent rows of openings (111) are staggered and arranged at equal intervals. Each row of openings (111) includes a plurality of openings (111). The plurality of outer tubes (12) are arranged in parallel and wound around the outer side of the inner tube (11), and the length direction of the plurality of outer tubes (12) is consistent with the central axis direction of the inner tube (11), and two adjacent outer tubes (12) are arranged at equal intervals, and the plurality of outer tubes (12) correspond to the plurality of rows of openings (111) one by one, and the vertical center line of each row of openings (111) coincides with the radial direction of each corresponding outer tube (12), and there is a gap between each row of openings (111) and each corresponding outer tube (12), The fluid box (2) has a fluid inlet (22), a fluid outlet (23) and an air inlet (25), wherein the fluid inlet (22) and the fluid outlet (23) are respectively connected to a plurality of outer tubes (12), and the air inlet (25) is connected to the mixing chamber (112). The fluid box at one end of the tubular body has a fluid inlet (22), a fluid outlet (23) and a partition (24) for separating the fluid inlet (22) and the fluid outlet (23), wherein the fluid The inlet (22) and the fluid outlet (23) are respectively connected to a plurality of outer tubes (12); the fluid box (2) at the other end of the tubular body (1) has an air inlet (25); the air inlet (25) is connected to the mixing chamber (112); the fluid box (2) comprises a front water box (20a) and a rear water box (20b); the rear water box has a fluid inlet (22), a fluid outlet (23) and a partition (24); the front water box (20a) is equipped with an electronic igniter.

2. The water-cooled burner according to claim 1, characterized in that: The outer diameter of the light pipe is 15-40 mm, and the wall thickness of the light pipe is 1.0-3.0 mm. Along the cross-sectional direction of the tubular body (1), a plurality of light tubes form a ring structure.

3. The water-cooled burner according to claim 1, characterized in that: The fin tube comprises an inner tube (1211) and a plurality of fins (1212) arranged outside the inner tube. Two adjacent fin tubes (121) are arranged at equal intervals, and a partition plate (14) is arranged between the two adjacent fin tubes. The length of the partition plate is consistent with the length of the fin tube fins (1212), and there is a gap between the two adjacent partition plates. Each gap corresponds to each row of openings of the inner tube (11) one by one.

4. The water-cooled burner according to claim 1, characterized in that: The partition plate (14) comprises a U-shaped groove body (141), the length of the U-shaped groove body (141) is consistent with the length of the partition plate, and a connecting plate (142) extends outward from the opening of the U-shaped groove body along the length direction of the U-shaped groove body. The U-shaped groove body (141) is inserted between two adjacent fin tubes, and the notch of the U-shaped groove body (141) faces the inner tube (11), and the connecting plate (142) is close to the inner tube (11).

5. The water-cooled burner according to claim 3, characterized in that: The outer diameter of the finned tube is 15-40 mm, the wall thickness of the finned tube is 1.0-3.0 mm, and along the cross-sectional direction of the tubular body (1), a plurality of finned tubes form a ring structure.

6. The water-cooled burner according to claim 1, characterized in that: The tubular body (1) further comprises an annular rib plate (13), wherein the rib plate (13) is sleeved on the outer side of the inner tube (11), and a receiving groove (131) is formed on the rib plate (13), and the outer tube (12) extends along the central axis and passes through the receiving groove (131).

7. A condensing boiler, characterized in that: It comprises the water-cooled burner described in any one of claims 1 to 6.

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