CN217684978U - Water-cooled burner - Google Patents

Water-cooled burner Download PDF

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Publication number
CN217684978U
CN217684978U CN202220617334.3U CN202220617334U CN217684978U CN 217684978 U CN217684978 U CN 217684978U CN 202220617334 U CN202220617334 U CN 202220617334U CN 217684978 U CN217684978 U CN 217684978U
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Prior art keywords
water
finned
tube
inner tube
inner cylinder
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CN202220617334.3U
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Chinese (zh)
Inventor
崔树庆
殷海鹏
叶昕
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Valpo Energy & Environment Tech Co ltd
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Valpo Energy & Environment Tech Co ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]

Abstract

The utility model discloses a water-cooled combustor, it include the siphonozooid and connect in the fluid tank at siphonozooid both ends, the siphonozooid includes inner tube and honeycomb duct, the inner tube extends along the central axis, and it has the hybrid chamber, be equipped with the multirow trompil on the inner tube, the honeycomb duct includes fluorescent lamp and finned tube, and many finned tubes are around establishing along the inner tube circumferencial direction the outside of inner tube, many fluorescent lamps are around establishing along the inner tube circumferencial direction the outside of finned tube, the fluid tank is provided with water inlet, delivery port and air inlet, water inlet and delivery port communicate with the honeycomb duct respectively, the air inlet with the hybrid chamber intercommunication. The utility model discloses a water-cooled water heater's flame stability is high, and heat exchange tube heat transfer intensity reduces, and life increases, and flame temperature reduces, has effectively restrained nitrogen oxide's production.

Description

Water-cooled burner
Technical Field
The utility model relates to a boiler technical field especially relates to a water-cooled combustor.
Background
The target group of combustor is extensive, has fields such as boiler, smelting furnace, smelting pot, thermal treatment, and the trade related to heat energy, and combustion system is indispensable, and wherein the condensing boiler has the characteristics of energy-efficient environmental protection, is the development direction of boiler trade, and the technology of small-size condensing boiler or gas condensation water heater has become mature gradually at present.
Surface formula low-nitrogen burner among the prior art, need a large amount of air during the combustor burning, contain a large amount of impurity in the air, current condensation boiler adopts surface formula metal fiber net structure combustor more, its surface is netted, current surface formula combustor passes through winding on the surface's metal mesh, can filter the air that gets into the combustor, can make the mist distribute evenly, there is certain tempering prevention function simultaneously, but current combustor easily causes combustor surface blocking, need often to change, wash, waste time and energy, and in case can greatly reduced boiler output after blockking up, and easily cause the combustor to damage, can lead to potential safety hazards such as deflagration even under the adverse circumstances.
At the present stage, the content of nitrogen oxides in the flue gas after the combustion of the water-cooled combustor can be reduced to 30mg/m 3 Further research and development are required if further reduction is required.
Therefore, a new technical solution is needed.
SUMMERY OF THE UTILITY MODEL
For solving the technical problem who exists among the prior art, the utility model discloses a water-cooled combustor, it include the siphonozooid and connect in the fluid box at siphonozooid both ends, the siphonozooid includes inner tube and honeycomb duct, the inner tube extends along the central axis, and it has the hybrid chamber, be equipped with the multirow trompil on the inner tube, the honeycomb duct includes fluorescent lamp and finned tube, and many finned tubes are around establishing along the inner tube circumferencial direction the outside of inner tube, many fluorescent lamps are around establishing along the inner tube circumferencial direction the outside of finned tube, the fluid box is provided with water inlet, delivery port and air inlet, water inlet and delivery port respectively with the honeycomb duct intercommunication, the air inlet with the hybrid chamber intercommunication.
Further, the length direction of the finned tube is consistent with the direction of the central axis of the inner barrel, the length direction of the light pipe is consistent with the direction of the central axis of the finned tube, and a gap is formed between each light pipe and the adjacent finned tube.
Furthermore, one end of the inner cylinder is open, the other end of the inner cylinder is closed, and the multiple rows of open holes are communicated with the mixing cavity.
Furthermore, the multiple rows of openings are arranged at equal intervals along the circumferential direction of the inner cylinder, each row of openings comprises multiple openings, and the interval between two adjacent openings in the multiple openings is gradually increased from the air inlet along the central axis direction of the inner cylinder.
Further, the fluid tank includes preceding water tank and back water tank, preceding water tank and back water tank are annular water tank, be provided with water inlet and delivery port on the back water tank, water inlet and delivery port and back water tank intercommunication, be provided with the air inlet on the preceding water tank.
Furthermore, a partition board is arranged between every two adjacent finned tubes and is a T-shaped partition board, the length of the partition board is consistent with that of the finned tube fins, gaps are formed between every two adjacent partition boards, each gap corresponds to each row of holes one by one, and a channel between every two adjacent finned tube fins corresponds to each hole of each row of holes one by one.
Further, the baffle includes U type cell body, follows the length direction of U type cell body, certainly U type cell body notch department outwards extends has the connecting plate, U type cell body inserts between two adjacent finned tubes, and the notch orientation of U type cell body the inner tube, the connecting plate is close to the inner tube.
Furthermore, a first clearance area is arranged between the connecting plate and the inner cylinder, and a high-temperature-resistant long strip-shaped gasket is arranged in the first clearance area.
Furthermore, two ends of the finned tube are respectively welded with an end plate of the fluid box, a second clearance area is arranged between the fin close to the end plate and the end plate, and a high-temperature resistant layer is hermetically filled in the second clearance area.
Compared with the prior art, the utility model discloses a water-cooled combustor has following one or more beneficial effect:
(1) The utility model discloses a water-cooled combustor has the honeycomb duct, and the honeycomb duct includes fluorescent lamp and finned tube, through increasing the round fluorescent lamp again at the finned tube outer lane, is favorable to the diffusion of flame, increases the stability of igniteing, has increased partly heat transfer area simultaneously, reduces honeycomb duct heat transfer intensity, increases life, still is favorable to reducing the flame temperature, prolongs the combustion reaction time, has effectively restrained nitrogen oxide's production.
(2) The utility model discloses a water-cooled combustor sets up the baffle between two adjacent finned tubes, can effectively prevent the interference between flame and the flame, increasing the heat efficiency to guarantee that flame can the stable combustion, simultaneously through filling the rectangular shape gasket of temperature resistant in the clearance of connecting plate and inner tube, the vibration of buffering connecting plate and inner tube can weaken the noise.
(3) The utility model discloses an among the water-cooled combustor, follow the inner tube opening part along the trompil of inner tube central line direction by close to sparse, suit with by the gas flow field phase-match from the inner tube opening part to the inner tube inside to guarantee that combustor surface flame is even, the burning is stable.
(4) The utility model discloses an among the water-cooled combustor, it has high temperature resistant material to fill between the fin at finned tube both ends and the end plate, and high temperature resistant material gets up the fin of finned tube tip and the clearance shutoff of end plate, has effectively reduced the tempering risk.
Drawings
FIG. 1 is a schematic structural diagram of a water-cooled burner according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an inner barrel of a water-cooled burner provided by an embodiment of the present invention;
FIG. 3 is an enlarged view of section III of FIG. 2;
FIG. 4 is a subjective illustration of FIG. 1;
FIG. 5 is a sectional view taken along line C of FIG. 4;
FIG. 6 is an enlarged view of section II of FIG. 5;
FIG. 7 is an enlarged view of the portion IV of FIG. 6;
FIG. 8 is a sectional view taken along line B of FIG. 4;
FIG. 9 is an enlarged view of section I of FIG. 8;
FIG. 10 is an enlarged view of section V of FIG. 9;
fig. 11 is a top view of a water-cooled burner according to an embodiment of the present invention;
fig. 12 is a cross-sectional view taken along line D of fig. 11.
The device comprises a tubular body, a fluid tank, an inner cylinder, a flow guide pipe, a mixing cavity, a hole, a light pipe, a finned tube, a partition plate, a U-shaped tank body, a first gap area, a second gap area, a front water tank, a rear water tank, a gas inlet, a fire observation hole, a fire guide ignition needle mounting opening, an end plate, an 18 water inlet, a water outlet and a connecting plate, wherein the tubular body is 1-tubular body, the fluid tank is 2-fluid tank, the mixing cavity is 3-inner cylinder, the flow guide pipe is 4-flow guide pipe, the mixing cavity is 5-mixing cavity, the hole is 6-open, the light pipe is 7-light pipe, the finned tube is 8-fin pipe, the partition plate is 10-U-shaped tank body, the first gap area is 11-first gap area, the second gap area is 12-second gap area, the front water tank is 2a, the rear water tank is 2b, the air inlet, the fire guide ignition needle mounting opening is 16-fire guide ignition needle, the end plate is 17-end plate, the 18-water inlet, the 19-water outlet and the connecting plate is 20-connecting plate.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or may be connected through the interior of two elements or in interactive relation with one another. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
Referring to fig. 1, the present invention provides a water-cooled burner, which includes a tubular body 1 and fluid tanks 2 connected to two ends of the tubular body 1, wherein the tubular body 1 includes an inner tube 3 and a flow guiding tube 4 wound around the inner tube 3, and the fluid tanks 2 are connected to the tubular body 1 by welding.
Referring to fig. 1, 2 and 3, the inner cylinder 3 extends along the central axis, one end of the inner cylinder is open, the other end of the inner cylinder is closed, the inner cylinder has an inner surface and an outer surface, the inner surface forms a mixing chamber 5, the outer surface is provided with a plurality of rows of openings 6, the plurality of rows of openings 6 are communicated with the mixing chamber 5, the plurality of rows of openings 6 are arranged at equal intervals along the circumferential direction of the inner cylinder 3, each row of openings 6 comprises a plurality of openings 6, and the interval between two adjacent openings of the plurality of openings 6 increases from the opening of the inner cylinder 3 along the central line direction of the inner cylinder 3. That is to say, the number of the openings 6 is from dense to sparse along the central line direction of the inner cylinder 3 from the opening of the inner cylinder 3, and the openings 6 are matched with the flow field of gas from the opening of the inner cylinder to the inner part of the inner cylinder, so that the surface flame of the combustor is uniform and the combustion is stable.
Referring to fig. 5, 8 and 9, the draft tube 4 includes a light pipe 7 and fin tubes 8, the plurality of fin tubes 8 are wound around the outer side of the inner cylinder 3 along the circumferential direction of the inner cylinder 3, the length direction of the fin tubes 8 is the same as the axial direction of the inner cylinder 3, two adjacent fin tubes 8 are arranged at equal intervals, a partition plate 9 is arranged between the two adjacent fin tubes 8, the partition plate 9 is a T-shaped partition plate, the length of the partition plate 9 is the same as the length of the fins of the fin tubes 8, a gap is formed between the two adjacent partition plates 9, each gap corresponds to each row of holes 6 one by one, the centers of the fins of the fin tubes 8 are in one-to-one correspondence with each hole of each row of holes, and the partition plate 9 arranged between the two adjacent fin tubes 8 can effectively prevent interference between flames, improve the thermal efficiency, and thus ensure stable combustion of flames.
Referring to fig. 9 and 10, the partition board 9 includes a U-shaped groove 10, the length of the U-shaped groove 10 is the same as that of the partition board 9, a connecting plate 20 extends outwards from an opening of the U-shaped groove 10 along the length direction of the U-shaped groove 10, the U-shaped groove 10 is inserted between two adjacent finned tubes 8, a notch of the U-shaped groove 10 faces the inner tube 3, the connecting plate 20 is close to the inner tube 3, a first gap area 11 is formed between the connecting plate 20 and the inner tube 3, and a strip-shaped gasket processed by a temperature-resistant material is filled in the first gap area 11.
It should be noted that, when flue gas enters the fins of the finned tube 8 from the opening 6, the high-speed airflow drives the connecting plate 20 and the inner tube 3 to vibrate to generate noise, and the gap between the connecting plate 20 and the inner tube 3 is filled with a temperature-resistant strip-shaped gasket to buffer the vibration of the connecting plate 20 and the inner tube 3, so that the noise can be reduced.
Referring to fig. 5, 6 and 7, two ends of the finned tube 8 are respectively welded to end plates 17 of the fluid tank 2, fins at two ends of the finned tube 8 and the end plates 17 in the fluid tank 2 have second gap regions 12, the second gap regions 12 are sealed and filled with high temperature resistant materials, and the high temperature resistant materials seal gaps between the fins at the ends of the finned tube 8 and the end plates 17.
It should be noted that the lengths of the fins on the finned tube 8 are not completely the same, the finned tube is misaligned when being mounted on the end plate 17, and the distance between the fin at the end of the finned tube 8 and the end plate 17 is different from the distance between two adjacent fins on the finned tube 8, so that the flow rates of the gas entering the periphery of the fins through the opening 6 are different, the flow of the gas is unstable, and if the flow rate of the gas is slow, a tempering risk exists, and further, a high-temperature-resistant material needs to be filled to seal the gap between the fin at the end of the finned tube and the end plate.
Furthermore, the outer surfaces of the parts close to the two ends of the inner cylinder 3 can be provided with no opening, so that the situation that the openings at the two ends of the inner cylinder enter the fin at the end part of the finned tube is prevented, and mixed gas is prevented from being sprayed out and combusted from the two ends of the inner cylinder, so that the tempering risk is prevented.
Referring to fig. 8 and 9, a plurality of light pipes 7 are arranged around the periphery of the finned tube 8 along the circumferential direction of the inner tube 3, the length direction of the light pipes 7 is consistent with the axial direction of the inner tube 3, the light pipes 7 correspond to the finned tube 8 one by one, and a gap is formed between each light pipe 7 and the finned tube 8, so that the flue gas can fully exchange heat with the light pipes 7 and the finned tube 8, and the circle of light pipes 7 is arranged on the outer ring of the finned tube 8, thereby facilitating the diffusion of flame, increasing the ignition stability, increasing a part of heat exchange area, reducing the heat exchange strength of the honeycomb duct, and prolonging the service life.
The light pipes 7 are stainless steel light pipes, a plurality of light pipes 7 form an annular structure along the section direction of the tubular body 1, the finned tubes 8 are stainless steel finned tubes, a plurality of finned tubes 8 form an annular structure along the section direction of the tubular body 1, and the honeycomb duct 4 is made of stainless steel materials, has high heat resistance and fire resistance, can resist scaling and keeps strength at high temperature.
Referring to fig. 1, fig. 11 and fig. 12, arrows in the drawings are directions of fluid, the fluid tank 2 includes a front water tank 2a and a rear water tank 2b, the front water tank 2a and the rear water tank 2b are both configured as annular water tanks, the rear water tank 2b is provided with a water inlet 18 and a water outlet 19, the water inlet 18 and the water outlet 19 are communicated with the rear water tank 2b, the fluid enters the rear water tank 2b from the water inlet 18 and then enters the draft tube 4 through the rear water tank 2b, the fluid flows out from the water outlet 19 after at least secondary circulation of the fluid in the draft tube 4, the draft tube 4 includes a light pipe 7 and a finned tube 8, the range of fluid circulation is greatly increased by passing the light pipe 7 and the finned tube 8, and the fluid tank 2 is configured as an annular water tank, so that the pressure bearing capacity of the fluid tank is enhanced.
Referring to fig. 1, the front water tank 2a is provided with an air inlet 14, the air inlet 14 is communicated with the mixing cavity 5, air (fuel gas and air) conveyed by an external fan or mixer enters the mixing cavity 5 through the air inlet 14, passes through the openings 6 on the inner cylinder 3, and is combusted on the outer side surface of the finned tube 8 and around the light pipe 7, cold water is closer to flame, and the temperature of the flame is lower, so that nitrogen oxides generated by combustion can be further reduced.
Referring to fig. 1 and 8, the front water tank 2a further has a fire observation hole 15 and a fire guiding ignition needle mounting hole 16, the combustion condition at the outer side of the draft tube 4 or at the side of the draft tube 4 can be observed through the fire observation hole 15, and an ignition needle is mounted at the fire guiding ignition needle mounting hole 16.
Specifically, the gas entering from the mixing cavity is subjected to gas flow distribution through the opening of the inner cylinder, part of the gas distributed through the inner cylinder penetrates through a gap between two adjacent T-shaped partition plates, enters a gap between fins of the finned tube and then enters the light tube, so that the gas is combusted on the outer side surface of the finned tube and around the light tube, and fluid water flow in the finned tube and the light tube has a cooling effect on combustion flame, so that the temperature of the flue gas generated by combustion is reduced, and the content of nitrogen oxides in the flue gas is reduced.
Compared with the prior art, the utility model discloses a water-cooled combustor has following one or more beneficial effect:
(1) The utility model discloses a water-cooled combustor has the honeycomb duct, and the honeycomb duct includes fluorescent lamp and finned tube, through increasing the round fluorescent lamp again at the finned tube outer lane, is favorable to the diffusion of flame, increases the stability of igniteing, has increased partly heat transfer area simultaneously, reduces honeycomb duct heat transfer intensity, increases life, still is favorable to reducing the flame temperature, prolongs the combustion reaction time, has effectively restrained nitrogen oxide's production.
(2) The utility model discloses a water-cooled combustor sets up the baffle between two adjacent finned tubes, can effectively prevent the interference between flame and the flame, increasing the heat efficiency to guarantee that flame can the stable combustion, simultaneously through filling the rectangular shape gasket of temperature resistant in the clearance of connecting plate and inner tube, the vibration of buffering connecting plate and inner tube can weaken the noise.
(3) The utility model discloses an among the water-cooled combustor, follow the inner tube opening part along the trompil of inner tube central line direction by close to sparse, suit with the flow field phase-match by the inside gaseous of inner tube from the inner tube opening part to guarantee that combustor surface flame is even, the burning is stable.
(4) The utility model discloses an among the water-cooled combustor, it has high temperature resistant material to fill between the fin at finned tube both ends and the end plate, and high temperature resistant material gets up the fin of finned tube tip and the clearance shutoff of end plate, has effectively reduced the tempering risk.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by one skilled in the art.
While embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications and changes may be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (9)

1. A water-cooled burner characterized by: comprises a tubular body (1) and fluid tanks (2) connected to two ends of the tubular body (1), wherein the tubular body (1) comprises an inner cylinder (3) and a draft tube (4),
the inner cylinder (3) extends along the central axis and is provided with a mixing cavity (5), the inner cylinder (3) is provided with a plurality of rows of holes (6),
the guide pipe (4) comprises light pipes (7) and finned pipes (8), a plurality of finned pipes (8) are arranged on the outer side of the inner cylinder (3) in a winding manner along the circumferential direction of the inner cylinder (3), a plurality of light pipes (7) are arranged on the outer side of the finned pipes (8) in a winding manner along the circumferential direction of the inner cylinder (3),
the fluid tank (2) is provided with a water inlet (18), a water outlet (19) and an air inlet (14), the water inlet (18) and the water outlet (19) are respectively communicated with the flow guide pipe (4), and the air inlet (14) is communicated with the mixing cavity (5).
2. The water-cooled burner according to claim 1, wherein the length direction of the finned tubes (8) coincides with the central axis direction of the inner barrel (3), the length direction of the bare tubes (7) coincides with the central axis direction of the finned tubes (8), and each bare tube (7) has a gap with the adjacent finned tube (8).
3. The water-cooled burner according to claim 2, wherein the inner barrel (3) is open at one end and closed at the other end, and the plurality of rows of openings (6) communicate with the mixing chamber (5).
4. The water-cooled burner according to claim 3, characterized in that a plurality of rows of the openings (6) are arranged at equal intervals along the circumferential direction of the inner barrel (3), each row of the openings (6) comprises a plurality of openings, and the interval between two adjacent openings in the plurality of openings (6) is gradually increased from the air inlet (14) along the central axis direction of the inner barrel (3).
5. The water-cooled burner according to claim 4, characterized in that the fluid tank (2) comprises a front water tank (2 a) and a rear water tank (2 b), both the front water tank (2 a) and the rear water tank (2 b) are annular water tanks, the rear water tank (2 b) is provided with the water inlet (18) and the water outlet (19), the water inlet (18) and the water outlet (19) are communicated with the rear water tank (2 b), and the front water tank (2 a) is provided with the air inlet (14).
6. The water-cooled burner according to claim 5, characterized in that a partition plate (9) is arranged between two adjacent finned tubes (8), the partition plate is a T-shaped partition plate, the length of the partition plate (9) is identical to that of the finned tubes (8), a gap is arranged between two adjacent partition plates (9), each gap corresponds to each row of the holes (6) in a one-to-one manner, and a channel between two adjacent finned tubes (8) corresponds to each hole of each row of the holes (6) in a one-to-one manner.
7. The water-cooled burner according to claim 6, wherein the partition (9) comprises a U-shaped groove (10), a connecting plate (20) extends outwards from the notch of the U-shaped groove (10) along the length direction of the U-shaped groove (10), the U-shaped groove (10) is inserted between two adjacent finned tubes (8), the notch of the U-shaped groove (10) faces the inner barrel, and the connecting plate (20) is close to the inner barrel (3).
8. The water-cooled burner according to claim 7, characterized in that a first gap area (11) is provided between the connection plate (20) and the inner barrel (3), and a high temperature resistant long strip-shaped gasket is provided in the first gap area (11).
9. The water-cooled burner according to claim 8, characterized in that both ends of the finned tube (8) are respectively welded with an end plate (17) of the fluid tank (2), a second clearance area (12) is arranged between the fin close to the end plate (17) and the end plate (17), and the second clearance area (12) is hermetically filled with a high temperature resistant layer.
CN202220617334.3U 2022-03-18 2022-03-18 Water-cooled burner Active CN217684978U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202220617334.3U CN217684978U (en) 2022-03-18 2022-03-18 Water-cooled burner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202220617334.3U CN217684978U (en) 2022-03-18 2022-03-18 Water-cooled burner

Publications (1)

Publication Number Publication Date
CN217684978U true CN217684978U (en) 2022-10-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202220617334.3U Active CN217684978U (en) 2022-03-18 2022-03-18 Water-cooled burner

Country Status (1)

Country Link
CN (1) CN217684978U (en)

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