CN214891169U - Premixing type industrial burner - Google Patents
Premixing type industrial burner Download PDFInfo
- Publication number
- CN214891169U CN214891169U CN202121116052.7U CN202121116052U CN214891169U CN 214891169 U CN214891169 U CN 214891169U CN 202121116052 U CN202121116052 U CN 202121116052U CN 214891169 U CN214891169 U CN 214891169U
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- Prior art keywords
- tube
- exhaust
- pipe body
- air
- pipe
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- 238000009423 ventilation Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 description 90
- 239000000203 mixture Substances 0.000 description 16
- 238000002485 combustion reaction Methods 0.000 description 15
- 239000011324 bead Substances 0.000 description 12
- 230000002269 spontaneous effect Effects 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
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- Gas Burners (AREA)
Abstract
The utility model discloses a mix formula industrial burner in advance relates to combustor technical field, including first body, the one end fixedly connected with body end plate of first body, body end plate one side central point puts fixedly connected with gas pipe, be provided with the second body in the first body, the other end fixedly connected with of first body mixes the room casing in advance, be provided with first air cavity in the second body, fixedly connected with air inlet pipe on the circumference outer wall of first body, and the one end of air inlet pipe extends to first air cavity in, is located mix the first air vent that the room casing was close to first body one end and was seted up a plurality of annular permutation and distribute on being located the circumference position of first air cavity inside in advance. The utility model discloses have the effect fully premixed gas and combustion-supporting gas.
Description
Technical Field
The utility model relates to a combustor technical field especially relates to a mix formula industrial burner in advance.
Background
The burner is a general term for a device for ejecting fuel and air in a certain manner to perform mixed combustion. The burners are classified into industrial burners, civil burners and special burners according to types and application fields. Is made of corrosion-resistant and high-temperature-resistant materials such as stainless steel or metallic titanium. The burner functions to atomize the sample by flame combustion.
Most of existing burners comprise a gas pipe, an ignition device, a ventilation cavity, an exhaust pipe and the like, and gas is introduced into the ventilation cavity through the gas pipe and is further exhausted through the exhaust pipe and then ignited by the ignition device.
However, the conventional device has a large power and a constant oxygen content in air when in use, so that a large amount of gas cannot be sufficiently combusted when in use, and a large amount of harmful gas is generated.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the defects existing in the prior art and providing a premixing type industrial burner. Its advantage is fully premixing fuel gas and combustion-supporting gas.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a premixing type industrial burner comprises a first pipe body, wherein one end of the first pipe body is fixedly connected with a pipe body end plate, a gas pipe is fixedly connected at the center of one side of the end plate of the pipe body, a second pipe body is arranged in the first pipe body, the other end of the first pipe body is fixedly connected with a premixing chamber shell, a first air cavity is arranged in the second pipe body, an air inlet pipe is fixedly connected on the circumferential outer wall of the first pipe body, one end of the air inlet pipe extends into the first air cavity, a plurality of first vent holes which are distributed in an annular array are arranged at the circumferential position of one end of the premixing chamber shell, which is close to the first pipe body and is positioned in the first air cavity, a plurality of second vent holes distributed in an annular array are arranged at the center of the premixing chamber shell close to one end of the first pipe body, the premixing chamber shell is provided with a premixing chamber, and an exhaust outer pipe is arranged at the central position of one end, far away from the first pipe body, of the premixing chamber shell.
Through the technical scheme: when using, let in the gas by the gas pipe in to first air cavity, further let in the air by the air inlet pipe in to first air cavity, make air and gas earlier further contact the mixture in first air cavity, further let in the gas of preliminary mixing in advance mixing chamber through first air vent and second air vent, make gas fully mixed in advance mixing chamber, further discharge through the exhaust outer tube, increased the degree of mixing of gas and air, improved the combustion efficiency of gas.
The utility model discloses further set up to, be provided with the second air cavity between the circumference inner wall of first body and the circumference outer wall of second body, in advance the room casing be close to first body one end and with second air cavity contact area position set up the third air vent that a plurality of annular permutation distributes, fixedly connected with combustion-supporting gas inlet tube on the circumference outer wall of first body, and the one end of combustion-supporting gas inlet tube extends to in the second air cavity.
Through the technical scheme: the combustion-supporting gas is introduced into the second air cavity through the combustion-supporting gas inlet pipe, and then is introduced into the premixing chamber through the third vent hole, so that the gas can be more fully and completely combusted, and the combustion efficiency of the gas is further improved.
The utility model discloses further set up to, the fire observation hole has been seted up to one side of body end plate, and sees the fire hole and communicate with each other with first air cavity and second air cavity simultaneously.
Through the technical scheme: the observation of the fire observation hole to the first air cavity and the second air cavity in the pipeline can find out whether the phenomenon of backfire and spontaneous combustion occurs in the pipeline in time, and the safety degree of gas premixing is improved.
The utility model discloses further set up to, first air vent slope is seted up, second air vent level is seted up, third air vent slope is seted up, and the incline direction of third air vent is opposite with first air vent.
Through the technical scheme: the preliminary mixed gas in the first gas cavity is led to the inner wall of the premixing chamber through the first air vent which is obliquely arranged, and then is led to the central position of the premixing chamber through the second air vent which is horizontally arranged, and the combustion-supporting gas in the second gas cavity is led to the central position of the premixing chamber through the third air vent which is obliquely arranged, so that the gas can be fully contacted and mixed in the premixing chamber, and the filling degree of gas mixing is improved.
The utility model discloses further set up to, mix the room casing in advance and be the round platform shape, and mix the bore that the room casing is close to first body one end in advance and be greater than its bore of keeping away from first body one end.
Through the technical scheme: through the shape setting of the premixing chamber, the gas is further compressed and mixed in the premixing chamber, and the gas mixing efficiency is improved.
The utility model is further provided with that one end of the exhaust outer pipe far away from the first pipe body is sealed, a circular notch is arranged at the center of one end of the premixing chamber shell far away from the first pipe body, an exhaust inner pipe is arranged in the exhaust outer pipe, and one end of the circumferential outer wall of the exhaust inner pipe close to the first pipe body is jointed with the inner wall of the circular groove, a plurality of annular exhaust notches which are distributed in an array are arranged on the circumference of the exhaust inner pipe, a moving plate is arranged at one end of the circumferential inner wall of the exhaust inner pipe, which is close to the first pipe body, a spring is fixedly connected between the moving plate and the inner wall of one end of the exhaust outer tube far away from the first tube body, an exhaust cavity is arranged between the inner circumferential wall of the outer exhaust pipe and the outer circumferential wall of the inner exhaust pipe, and a plurality of air outlets distributed in an annular array are formed in one end, away from the first pipe body, of the exhaust cavity.
Through the technical scheme: when the premixing chamber is filled with gas, the moving plate connected with the spring is moved backwards by the air pressure of the fully mixed gas, so that the gas in the premixing chamber is introduced into the exhaust cavity through the exhaust notch on the exhaust inner pipe and is further discharged through the air outlet hole, the gas can be fully mixed in the premixing chamber, and the combustion efficiency of the gas is improved.
The utility model discloses further set up to, the one end central point that first body was kept away from to the exhaust outer tube puts and has seted up the notch of igniteing, fixed mounting has the electrode needle of striking sparks in the notch of igniteing.
Through the technical scheme: when the gas after mixing was discharged by the venthole, ignite gas through motor ignition needle, and motor ignition needle is located the positive rear of lighting gas flame, has reduced motor ignition needle's damage degree and change frequency, is convenient for use for a long time.
The utility model discloses further set up to, mix the one end fixedly connected with deep bead that first body was kept away from to the room casing in advance, the deep bead is the loudspeaker shape, and the deep bead is close to the one end bore that mixes the room casing in advance and is less than the bore of the other end, set up the through-hole that a plurality of annular permutation distributes on the circumference lateral wall of deep bead.
Through the technical scheme: sheltering from the wind current of gas vent department by the deep bead, having improved the successful efficiency of motor fire needle ignition outside, more avoided the wind current to blow away the exhaust gas and the danger of walking a fire that causes has improved the safety degree of device, further increases the area of contact who mixes gas and outside air by the through-hole that sets up on the deep bead, improves the combustion efficiency of gas.
The utility model has the advantages that:
1. the utility model discloses, through setting up first body, the body end plate, the gas pipe, the second body, first air cavity, mix the chamber casing in advance, mix the chamber in advance, first air vent, the air inlet pipe, second air vent and exhaust outer tube, when using, let in the gas by the gas pipe to first air cavity, further let in the air by the air inlet pipe to first air cavity, make air and gas further contact earlier at first air cavity and mix, further let in with the gas of preliminary mixing through first air vent and second air vent in mixing in advance, make gas mix the indoor intensive mixing in advance, further discharge through exhaust outer tube, the mixed degree of gas and air has been increased, the combustion efficiency of gas has been improved.
2. The utility model discloses, through setting up first air vent, second air vent and third air vent, when using, the preliminary mist of first air cavity accesss to premixing room inner wall department by the first air vent that the slope set up, and the second air vent that sets up by the level again accesss to premixing room central point and puts, and the combustion-supporting gas of further second air cavity accesss to premixing room central point by the third air vent that the slope set up puts for gas can be in premixing indoor intensive contact mix, has improved the degree of filling of gas mixture.
3. The utility model discloses, through setting up exhaust outer tube, exhaust inner tube, exhaust notch, venthole, exhaust chamber, spring and movable plate, when gaseous in the premixing chamber, gaseous atmospheric pressure makes the movable plate backward with spring coupling by the intensive mixing after the removal to the gas in premixing chamber lets in the exhaust intracavity through the exhaust notch on the exhaust inner tube, further by the venthole discharge, makes that gas can be abundant mix in premixing chamber, has improved the combustion efficiency of gas.
Drawings
Fig. 1 is a schematic structural view of a pre-mixing type industrial burner provided by the present invention;
fig. 2 is a schematic cross-sectional structure diagram of a pre-mixing type industrial burner provided by the present invention;
fig. 3 is an enlarged schematic view of a structure at a position a of the premixed industrial burner provided by the present invention.
In the figure: 1. a first pipe body; 2. a tube body end plate; 3. a gas pipe; 4. a combustion supporting gas inlet pipe; 5. an air inlet pipe; 6. a fire observation hole; 7. a second tube body; 8. a premix chamber housing; 9. a wind deflector; 10. a second air cavity; 11. a through hole; 12. a first air cavity; 13. a third vent hole; 14. a first vent hole; 15. a second vent hole; 16. a premixing chamber; 17. an electrode firing pin; 18. an air outlet; 19. an exhaust chamber; 20. a spring; 21. moving the plate; 22. an exhaust slot; 23. an exhaust inner pipe; 24. an exhaust outer tube.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar 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 only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
Referring to fig. 1-3, a premixing type industrial burner comprises a first tube 1, a tube end plate 2 fixedly connected to one end of the first tube 1, a gas tube 3 fixedly connected to the center of one side of the tube end plate 2, a second tube 7 disposed in the first tube 1, a premixing chamber housing 8 fixedly connected to the other end of the first tube 1, a first air chamber 12 disposed in the second tube 7, an air inlet tube 5 fixedly connected to the outer circumferential wall of the first tube 1, and an end of the air inlet tube 5 extending into the first air chamber 12, a plurality of first air holes 14 annularly arranged in a row at the circumferential position of the premixing chamber housing 8 near one end of the first tube 1 and inside the first air chamber 12, a plurality of second air holes 15 annularly arranged in a row at the center of the premixing chamber housing 8 near one end of the first tube 1, the premixing chamber housing 8 is provided with a premixing chamber 16, and an exhaust outer pipe 24 is provided at a central position of one end of the premixing chamber housing 8 away from the first pipe 1.
Be provided with second air cavity 10 between the circumference inner wall of first body 1 and the circumference outer wall of second body 7, mix in advance and be close to first body 1 one end of room casing 8 and offer the third air vent 13 of a plurality of annular permutation distribution with second air cavity 10 contact area position, fixedly connected with combustion-supporting gas inlet tube 4 on the circumference outer wall of first body 1, and the one end of combustion-supporting gas inlet tube 4 extends to in the second air cavity 10, let in combustion-supporting gas in to second air cavity 10 by combustion-supporting gas inlet tube 4, let in mixing in advance the room 16 by passing through third air vent 13 again, mix with air and gas in mixing in the room 16, make the gas can more abundant complete burning, the combustion efficiency of gas has further been improved.
The fire observation hole 6 has been seted up to one side of body end plate 2, and the fire observation hole 6 communicates with each other with first air cavity 12 and second air cavity 10 simultaneously, observes by first air cavity 12 and the second air cavity 10 of fire observation hole 6 in to the pipeline, in time discovers whether the phenomenon of backfire spontaneous combustion appears in the pipeline, improves the safe degree that the gas mixes in advance.
The first vent hole 14 is obliquely arranged, the second vent hole 15 is horizontally arranged, the third vent hole 13 is obliquely arranged, the oblique direction of the third vent hole 13 is opposite to that of the first vent hole 14, the primary mixed gas in the first air cavity 12 is communicated to the circumferential inner wall of the premixing chamber 16 through the obliquely arranged first vent hole 14, the horizontally arranged second vent hole 15 is communicated to the central position of the premixing chamber 16, and the combustion-supporting gas in the further second air cavity 10 is communicated to the central position of the premixing chamber 16 through the obliquely arranged third vent hole 13, so that the gas can be fully contacted and mixed in the premixing chamber 16, and the filling degree of gas mixing is improved.
The premixing chamber shell 8 is in a circular truncated cone shape, the caliber of one end, close to the first pipe body 1, of the premixing chamber shell 8 is larger than the caliber of one end, far away from the first pipe body 1, and the premixing chamber 16 is in a shape, so that gas is further compressed and mixed in the premixing chamber 16, and the gas mixing efficiency is improved.
The end of the outer exhaust pipe 24 far away from the first pipe 1 is closed, the center of the end of the premixing chamber housing 8 far away from the first pipe 1 is provided with a circular notch, the outer exhaust pipe 24 is internally provided with an inner exhaust pipe 23, the end of the outer circumferential wall of the inner exhaust pipe 23 near the first pipe 1 is attached to the inner wall of the circular notch, the inner exhaust pipe 23 is circumferentially provided with a plurality of exhaust notches 22 distributed in annular array, the end of the inner circumferential wall of the inner exhaust pipe 23 near the first pipe 1 is provided with a movable plate 21, a spring 20 is fixedly connected between the movable plate 21 and the inner wall of the outer exhaust pipe 24 far away from the first pipe 1, an exhaust cavity 19 is arranged between the inner circumferential wall of the outer exhaust pipe 24 and the outer circumferential wall of the inner exhaust pipe 23, the end of the exhaust cavity 19 far away from the first pipe 1 is provided with a plurality of exhaust holes 18 distributed in annular array, when the premixing chamber 16 is filled with gas, the moving plate 21 connected with the spring 20 is moved backwards by the air pressure of the fully mixed gas, so that the gas in the premixing chamber 16 is introduced into the exhaust cavity 19 through the exhaust notch 22 on the exhaust inner tube 23 and is further exhausted from the exhaust hole 18, the gas can be fully mixed in the premixing chamber 16, and the combustion efficiency of the gas is improved.
The one end central point that first body 1 was kept away from to exhaust outer tube 24 puts and has seted up the ignition notch, and fixed mounting has electrode fire needle 17 in the ignition notch, and when the gas after mixing was discharged by venthole 18, through electrode fire needle 17 with gas ignition, and electrode fire needle 17 is located the positive rear of lighting gas flame, has reduced electrode fire needle 17's damage degree and change frequency, is convenient for use for a long time.
It is worth mentioning, refer to fig. 2 and show, the one end fixedly connected with deep bead 9 of first body 1 is kept away from to premixing room casing 8, deep bead 9 is the loudspeaker shape, and deep bead 9 is close to the bore that the one end bore of premixing room casing 8 is less than the other end, set up the through-hole 11 of a plurality of annular permutation distribution on the circumference lateral wall of deep bead 9, shelter from the air current of venthole 18 department by deep bead 9, improved outside the successful efficiency of electrode fire-striking needle 17 ignition, more avoided the air current to blow off the discharged gas and the danger of walking fire that causes, the safety level of device has been improved, further increase the area of contact of mixing gas and outside air by the through-hole 11 that sets up on deep bead 9, the combustion efficiency of gas is improved.
The working principle is as follows: when using, let in the gas by gas pipe 3 in to first air cavity 12, further let in the air by air inlet pipe 5 in to first air cavity 12, make air and gas further contact the mixture in first air cavity 12 earlier, further let in premixing room 16 through first air vent 14 and second air vent 15 with the gas of preliminary mixing, make gas fully mix in premixing room 16, further discharge through exhaust outer tube 24, increased the degree of mixing of gas and air, improved the combustion efficiency of gas.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (8)
1. A premixing type industrial burner comprises a first pipe body (1), wherein one end of the first pipe body (1) is fixedly connected with a pipe body end plate (2), the center of one side of the pipe body end plate (2) is fixedly connected with a gas pipe (3), the premixing type industrial burner is characterized in that a second pipe body (7) is arranged in the first pipe body (1), the other end of the first pipe body (1) is fixedly connected with a premixing chamber shell (8), a first gas cavity (12) is arranged in the second pipe body (7), an air inlet pipe (5) is fixedly connected to the outer circumferential wall of the first pipe body (1), one end of the air inlet pipe (5) extends into the first gas cavity (12), a plurality of first vent holes (14) which are distributed in an annular array mode are formed in the circumferential position, close to one end of the first pipe body (1), and inside the first gas cavity (12), of the premixing chamber shell (8), the air conditioner is characterized in that a plurality of second air vents (15) distributed in an annular array mode are formed in the center of one end, close to the first pipe body (1), of the premixing chamber shell (8), a premixing chamber (16) is arranged on the premixing chamber shell (8), and an exhaust outer pipe (24) is arranged in the center of one end, far away from the first pipe body (1), of the premixing chamber shell (8).
2. The premixing type industrial burner according to claim 1, wherein a second air cavity (10) is arranged between the circumferential inner wall of the first pipe body (1) and the circumferential outer wall of the second pipe body (7), a plurality of third vent holes (13) distributed in an annular array are formed in the position of the premixing chamber shell (8) close to one end of the first pipe body (1) and the contact area of the premixing chamber shell and the second air cavity (10), a combustion-supporting gas inlet pipe (4) is fixedly connected to the circumferential outer wall of the first pipe body (1), and one end of the combustion-supporting gas inlet pipe (4) extends into the second air cavity (10).
3. The premixed industrial burner according to claim 2, wherein a fire observation hole (6) is formed at one side of the tube end plate (2), and the fire observation hole (6) is simultaneously communicated with the first air chamber (12) and the second air chamber (10).
4. The premixed industrial burner according to claim 3, wherein the first ventilation holes (14) are obliquely formed, the second ventilation holes (15) are horizontally formed, the third ventilation holes (13) are obliquely formed, and the third ventilation holes (13) are obliquely formed in a direction opposite to the direction of the first ventilation holes (14).
5. The premixed industrial burner according to claim 4, wherein the premixing chamber housing (8) is in the shape of a circular truncated cone, and the diameter of the premixing chamber housing (8) at the end close to the first tube (1) is larger than the diameter of the premixing chamber housing at the end far from the first tube (1).
6. The premixing type industrial burner according to claim 5, wherein one end of the exhaust outer tube (24) far away from the first tube (1) is closed, a circular notch is formed at a central position of one end of the premixing chamber casing (8) far away from the first tube (1), an exhaust inner tube (23) is arranged in the exhaust outer tube (24), one end of the exhaust inner tube (23) close to the first tube (1) is attached to the inner wall of the circular notch, a plurality of exhaust notches (22) are formed in the circumference of the exhaust inner tube (23) and are distributed in an annular array, a moving plate (21) is arranged at one end of the exhaust inner tube (23) close to the first tube (1), and a spring (20) is fixedly connected between the moving plate (21) and the inner wall of one end of the exhaust outer tube (24) far away from the first tube (1), an exhaust cavity (19) is arranged between the circumferential inner wall of the exhaust outer pipe (24) and the circumferential outer wall of the exhaust inner pipe (23), and a plurality of air outlet holes (18) which are distributed in an annular array are formed in one end, far away from the first pipe body (1), of the exhaust cavity (19).
7. The premixed industrial burner according to claim 6, wherein an ignition notch is formed in a central position of one end of the exhaust outer tube (24) far away from the first tube body (1), and an electrode ignition needle (17) is fixedly installed in the ignition notch.
8. The premixing type industrial burner according to claim 7, wherein a wind shield (9) is fixedly connected to one end of the premixing chamber housing (8) far away from the first tube (1), the wind shield (9) is horn-shaped, the caliber of one end of the wind shield (9) close to the premixing chamber housing (8) is smaller than that of the other end, and a plurality of through holes (11) are formed in the circumferential side wall of the wind shield (9) and are distributed in an annular array.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202121116052.7U CN214891169U (en) | 2021-05-20 | 2021-05-20 | Premixing type industrial burner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202121116052.7U CN214891169U (en) | 2021-05-20 | 2021-05-20 | Premixing type industrial burner |
Publications (1)
Publication Number | Publication Date |
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CN214891169U true CN214891169U (en) | 2021-11-26 |
Family
ID=78900625
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CN202121116052.7U Expired - Fee Related CN214891169U (en) | 2021-05-20 | 2021-05-20 | Premixing type industrial burner |
Country Status (1)
Country | Link |
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CN (1) | CN214891169U (en) |
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2021
- 2021-05-20 CN CN202121116052.7U patent/CN214891169U/en not_active Expired - Fee Related
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Granted publication date: 20211126 |