CN112013394B - Injection pipe assembly - Google Patents
Injection pipe assembly Download PDFInfo
- Publication number
- CN112013394B CN112013394B CN201910462738.2A CN201910462738A CN112013394B CN 112013394 B CN112013394 B CN 112013394B CN 201910462738 A CN201910462738 A CN 201910462738A CN 112013394 B CN112013394 B CN 112013394B
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- Prior art keywords
- gas
- partition
- injection pipe
- fuel gas
- longitudinal
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
- F23D14/64—Mixing devices; Mixing tubes with injectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
- F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/48—Nozzles
- F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C3/00—Stoves or ranges for gaseous fuels
- F24C3/08—Arrangement or mounting of burners
- F24C3/085—Arrangement or mounting of burners on ranges
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2203/00—Gaseous fuel burners
- F23D2203/007—Mixing tubes, air supply regulation
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Nozzles (AREA)
Abstract
The invention discloses an injection pipe assembly which comprises a nozzle and an injection pipe which are sequentially arranged along the flowing direction of fuel gas, wherein the injection pipe is provided with a horizontal section, a partition plate unit is arranged in the horizontal section of the injection pipe along the flowing direction of the fuel gas so as to partition a plurality of fuel gas channels, and the confluence positions of two adjacent fuel gas channels are arranged in a staggered manner along the flowing direction of the fuel gas. In this draw and penetrate the pipe subassembly, when the gas is spout from the nozzle, forms the mist together with the air and when penetrating the horizontal segment of pipe through this drawing, the mist can be separated along the gas flow direction by the baffle unit to flow in a plurality of gas passageways. Through the mutual position of converging that makes these gas passageways along gas flow direction dislocation arrangement, can converge and the degree of mixing of the gas of intermixture earlier relatively in the improvement, can make the gas of converging later and mixing simultaneously can keep the velocity of flow before mixing to it can carry out a lot of mixings in proper order at the in-process that flows to be the gas through this structure, improves the degree of consistency of gas, and guarantees the velocity of flow of gas.
Description
Technical Field
The invention relates to the field of combustors, in particular to an injection pipe assembly.
Background
The cooker ejector is one of the important components of a burner, which ejects the air in the surrounding environment through the flow of fuel gas. The range injector generally comprises a nozzle and an injection pipe, wherein the injection pipe can be divided into a contraction section, a horizontal section and an expansion section according to the change of a cross section along the gas flowing direction, the nozzle is arranged at the upstream position of the contraction section, and the outlet of the nozzle is aligned with the center position of the inlet of the contraction section so as to inject gas into the injection pipe and inject the surrounding air.
In the prior art, can draw intraductal setting up the baffle in order to locally separate the gas passageway in the pipeline to further mix through this kind of separation messenger's gas and air in the pipeline, improve the degree of mixing. However, when all the gas in the pipe converges somewhere in the pipe, turbulence is easily generated at the confluence point, so that the flow velocity of the gas is decreased. Therefore, the injection pipe in the prior art can inevitably lead to the condition that the flow rate of the fuel gas in the injection pipe is reduced while improving the fuel gas mixing degree.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an injection pipe assembly.
The invention solves the technical problems through the following technical scheme:
the utility model provides an draw and penetrate pipe assembly, its includes the nozzle that arranges in proper order along the gas flow direction and draws and penetrate the pipe, draw and penetrate the pipe and have the horizontal segment, draw and penetrate the pipe be equipped with the baffle unit along the gas flow direction in the horizontal segment to separate a plurality of gas passageways, it is double-phase adjacent the confluence position of gas passageway is along gas flow direction dislocation arrangement.
In this draw and penetrate the pipe subassembly, when the gas is spout from the nozzle, forms the mist together with the air and when penetrating the horizontal segment of pipe through this drawing, the mist can be separated along the gas flow direction by the baffle unit to flow in a plurality of gas passageways. Through the mutual position of converging that makes these gas passageways along gas flow direction dislocation arrangement, can converge and the degree of mixing of the gas of intermixture earlier relatively in the improvement, can make the gas of converging later and mixing simultaneously can keep the velocity of flow before mixing to it can carry out a lot of mixings in proper order at the in-process that flows to be the gas through this structure, improves the degree of consistency of gas, and guarantees the velocity of flow of gas.
Preferably, the partition plate unit comprises a plurality of longitudinal partition plates, the longitudinal partition plates are arranged along the radial direction of the horizontal section, and the gas channel is enclosed by the two adjacent longitudinal partition plates and the pipe wall of the injection pipe, so that the gas channel can be uniformly arranged along the circumferential direction of the injection pipe.
Under the layout mode, the position of each gas channel in the horizontal section can continuously extend to the central position from the edge of the injection pipe, so that when the nozzle sprays gas towards the central position of the injection pipe, the gas flowing in all the gas channels keeps relative balance.
Preferably, the surface of the longitudinal partition plate is provided with a communication hole, and the two gas channels positioned on two sides of the longitudinal partition plate can converge at the communication hole, so that the mixing uniformity of the gas in the plurality of gas channels is improved.
Preferably, the communication holes of the two longitudinal partition plates positioned on two sides of the gas channel are arranged along the flowing direction of the gas in a relative staggered manner, so that the gas in different gas channels can be mixed with the gas in the adjacent gas channels at different positions, and the flow rate of the gas is improved on the premise of ensuring the mixing degree of the gas.
Preferably, two adjacent gas channels on two sides of the longitudinal partition plate converge at the tail end of the longitudinal partition plate, and the tail ends of the longitudinal partition plates are arranged in a staggered mode along the gas flowing direction.
Preferably, the partition unit includes an annular partition plate, the annular partition plate encloses the gas channel, the annular partition plate extends along the axial direction of the horizontal section, and the plurality of longitudinal partition plates surround the annular partition plate and are respectively connected to the annular partition plate.
This annular baffle is surrounded by longitudinal baffle and is set up, makes the gas passageway that is enclosed by this annular baffle of nozzle spun gas accessible flow along the gas flow direction fast to improve and draw the whole velocity of flow of intraductal gas of penetrating.
Preferably, the gas passages can converge at the tail ends of the partition plates, and the tail ends of the annular partition plates are positioned behind the tail ends of all the longitudinal partition plates along the gas flowing direction, so that the gas passages surrounded by the annular partition plates can converge with other gas passages after the other gas passages converge mutually, and the gas passages surrounded by the annular partition plates are prevented from influencing the flow velocity of the gas in the gas passages due to premature convergence.
Preferably, the nozzle has a plurality of hole-shaped nozzles, the partition units are arranged in one-to-one correspondence with the hole-shaped nozzles, the hole-shaped nozzles are arranged toward the annular partition of the corresponding partition unit, and the position layout of the partition unit in the horizontal section is the same as the position layout of the hole-shaped nozzles in the nozzle.
Through this overall arrangement setting, under the condition that the nozzle that draws the shower subassembly has a plurality of hole shape spouts, make arbitrary one hole shape spout spun gas homoenergetic act on the partition plate unit that corresponds to realize setting up the produced beneficial effect of partition plate unit at the level end.
Preferably, the nozzle is further provided with a strip-shaped nozzle which is arranged between any two adjacent hole-shaped nozzles so as to form different injection at the injection pipe and improve the gas flow rate in the area between the two hole-shaped nozzles in the injection pipe.
Preferably, adjacent longitudinal partition plates of two partition plate units enclose an auxiliary gas channel together, and the strip-shaped nozzles are arranged towards the auxiliary gas channel.
The structure can keep the gas pressure balance of the injection pipe in the area between the hole-shaped spouts under the condition that the nozzles are arranged in parallel with the hole-shaped spouts, and the countercurrent condition between gas channels is avoided.
The positive progress effects of the invention are as follows:
in this draw and penetrate the pipe subassembly, when the gas is spout from the nozzle, forms the mist together with the air and when penetrating the horizontal segment of pipe through this drawing, the mist can be separated along the gas flow direction by the baffle unit to flow in a plurality of gas passageways. Through the mutual position of converging that makes these gas passageways along gas flow direction dislocation arrangement, can converge and the degree of mixing of the gas of intermixture earlier relatively in the improvement, can make the gas of converging later and mixing simultaneously can keep the velocity of flow before mixing to it can carry out a lot of mixings in proper order at the in-process that flows to be the gas through this structure, improves the degree of consistency of gas, and guarantees the velocity of flow of gas.
Drawings
Fig. 1 is a schematic perspective view of an injection pipe according to embodiment 1 of the present invention.
Fig. 2 is an internal structural schematic view of an ejector tube assembly according to embodiment 1 of the present invention.
Fig. 3 is a schematic front view of an injection pipe according to embodiment 1 of the present invention.
Fig. 4 is a schematic perspective view of an ejector tube assembly according to embodiment 2 of the present invention.
Fig. 5 is a schematic perspective view of a nozzle according to example 2 of the present invention.
Fig. 6 is a schematic front view of an injection pipe according to embodiment 2 of the present invention.
Fig. 7 is a perspective structural schematic view of an injection pipe according to embodiment 2 of the present invention.
Description of reference numerals:
Nozzle 1
Hole-shaped spout 11
Strip-shaped spout 12
The injection pipe 2, pipe wall 2a
A first gas passage 25a and a second gas passage 25b
Mixed flow stream 27
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1 to 3, the present invention provides an ejector tube assembly 10, the ejector tube assembly 10 includes a nozzle 1 and an ejector tube 2 sequentially arranged along a gas flow direction a, wherein the ejector tube 2 sequentially includes three sections, i.e., a contraction section 21, a horizontal section 22 and an expansion section 23, a partition unit 24 is disposed in the horizontal section 22 of the ejector tube 2 along the gas flow direction a, the partition unit 24 is configured to partition a plurality of gas passages (as shown in fig. 3, in this embodiment, the gas passages are specifically divided into a first gas passage 25a and a second gas passage 25b) in the horizontal section 22, the gas passages are relatively independent, and confluence positions of adjacent gas passages in the gas passages are different and are arranged along the gas flow direction a in a staggered manner.
When the gas is sprayed from the nozzle 1, forms mixed gas together with air and passes through the horizontal section 22 of the injection pipe 2, the mixed gas is divided by the partition plate unit 24 along the gas flowing direction a and flows in a plurality of gas channels. The mutual confluence positions of the gas passages are arranged in a staggered mode along the gas flowing direction A, so that the purpose of sectional confluence is achieved. This kind of segmentation converges can enough improve the degree of mixing of the gas that converges earlier relatively and intermix, also can make the gas that converges later and mix can keep the velocity of flow before mixing simultaneously to it can carry out a lot of in proper order in the flow process and mix through this structure to be the gas, improves the degree of consistency of gas, and guarantees the velocity of flow of gas.
Among them, the communication and confluence among the plurality of gas passages separated by the separator unit 24 can be realized by providing communication holes on the separators separating the gas passages, and the gas passages can also realize confluence at the ends of the separators, and when the gas passages are converged only at the ends of the separators, the ends of the separators on the separator unit 24 should be arranged in a staggered manner.
In this embodiment, as shown in fig. 1 and 3, the partition unit 24 includes a plurality of longitudinal partitions 241, the longitudinal partitions 241 are disposed along the radial direction of the horizontal section 22, and two adjacent longitudinal partitions 241 and the pipe wall 2a of the ejector pipe 2 enclose a first gas channel 25a, so that the first gas channel 25a can be disposed along the circumferential direction of the ejector pipe 2. In this arrangement, each first gas passage 25a is located in the horizontal section 22 and can extend continuously from the edge of the injection pipe 2 to the central position, so that when the nozzle 1 injects gas towards the central position of the injection pipe 2, all the gas flowing in the first gas passages 25a are kept relatively balanced. The longitudinal partition 241 is provided with a communication hole 2411 on the surface thereof so that the two first gas passages 25a on both sides of the longitudinal partition 241 can be converged at the communication hole 2411 to improve the mixing uniformity of the gas in the first gas passages 25 a. The communication holes 2411 should be arranged in a staggered manner along the gas flowing direction a (see fig. 2 in particular), so that the gas in different first gas passages 25a can be mixed with the gas in the adjacent first gas passages 25a at different positions, and the gas flow rate is increased on the premise of ensuring the gas mixing degree.
The partition plate unit 24 includes an annular partition plate 242, the annular partition plate 242 encloses a second gas passage 25b, the annular partition plate 242 is located at the center of the horizontal section 22 and extends along the axial direction of the horizontal section 22, that is, corresponds to the nozzle of the nozzle 1, so that the gas ejected from the nozzle 1 can rapidly flow along the gas flow direction a through the second gas passage 25b enclosed by the annular partition plate 242, so as to increase the overall flow rate of the gas in the ejector pipe 2. The plurality of longitudinal partitions 241 of the partition unit 24 are disposed around the annular partition 242, and are respectively connected to the annular partition 242, so that the partition unit 24 has a star-shaped partition shape.
In order to further increase the gas flow rate in the second gas passage 25b surrounded by the annular partition 242, the cross-sectional shape of the second gas passage 25b may correspond to the shape of the nozzle opening of the nozzle 1, for example, in the present embodiment, the nozzle opening of the nozzle 1 is a regular hexagon, and thus the cross-sectional shape surrounded by the annular partition 242 is also a regular hexagon. Further, the flow rate of the fuel gas in the second fuel gas passage 25b can be maintained by extending the passage length thereof. Specifically, after the first gas passages 25a surrounded by the longitudinal partition 241 and the pipe wall 2a of the injection pipe 2 converge with each other, the first gas passages converge with the second gas passages 25b, so as to avoid that the second gas passages 25b corresponding to the nozzles, which are located at the central position, converge with the first gas passages 25a too early to affect the overall flow rate of the gas in the second gas passages 25 b.
Example 2
As shown in fig. 4 to 7, the present embodiment provides an ejector tube assembly 10, which has substantially the same structure as the ejector tube assembly 10 provided in embodiment 1, except that in the present embodiment, the nozzle 1 has two hole-shaped nozzles 11, and the two hole-shaped nozzles 11 are arranged in parallel, so that the cross-sectional shape of the ejector tube 2 is correspondingly racetrack-shaped. In the horizontal section 22, there are two partition units 24, which are arranged in one-to-one correspondence with the hole-shaped nozzles 11, and the hole-shaped nozzles 11 are arranged toward the annular partition 242 of the corresponding partition unit 24, as shown in fig. 5, the position layout of the two partition units 24 in the horizontal section 22 is the same as the position layout of the hole-shaped nozzles 11 on the nozzle 1, so that the gas ejected from any one hole-shaped nozzle 11 can act on the corresponding partition unit 24, and the beneficial effect of arranging the partition unit 24 at the horizontal end is achieved.
In addition, the nozzle 1 further has a strip-shaped nozzle 12, and the strip-shaped nozzle 12 is arranged between the two hole-shaped nozzles 11 to form different injection at the injection pipe 2 and improve the gas flow rate in the region between the two hole-shaped nozzles 11 in the injection pipe 2. The adjacent longitudinal partition plates 241 of the two partition plate units 24 together enclose an auxiliary gas channel 26, so that the strip-shaped nozzles 12 between the two hole-shaped nozzles 11 are arranged corresponding to the auxiliary gas channel 26, and the gas jetted from the strip-shaped nozzles 12 flows through the auxiliary gas channel 26, and since the auxiliary gas channel 26 is also enclosed by the longitudinal partition plates 241, the gas is converged with the other adjacent first gas channels 25a through the communication hole 2411. This structure can keep drawing under the condition of nozzle 1 sets up a plurality of spouts side by side, draws the regional gas pressure balance of penetrating pipe 2 between each spout, avoids the gas passageway of specific position to appear the condition of backflowing because pressure is less relatively. In the present embodiment, the auxiliary gas channel 26 is also communicated with the first gas channel 25a through the communication hole 2411 on the longitudinal partition 241 (see the solid arrow in fig. 7), and the second gas channel 25b in the annular partition 242 of the partition unit 24 corresponds to the hole-shaped nozzles 11 to allow the gas jetted from the hole-shaped nozzles 11 to rapidly pass therethrough (see the dotted arrow in fig. 7).
In addition, the first gas passages 25a partitioned by the longitudinal partition plates 241 can merge with the adjacent gas passages (including the auxiliary gas passage 26 and the other first gas passages 25a) at the end positions of the longitudinal partition plates 241 in addition to merging with the adjacent gas passages (including the auxiliary gas passage 26 and the other first gas passages 25a) through the communication holes 2411, and therefore, the ends of the longitudinal partition plates 241 should be arranged in a staggered manner along the gas flow direction a for the purpose of segmented merging.
As shown in fig. 7, in order to further improve the gas mixing degree of the ejector tube assembly 10, a mixing column is further disposed at the connection between the horizontal section 22 and the expanding section 23 of the ejector tube 2, so as to further increase the disturbance degree of the gas flow of the air and gas mixture. The injection pipe 2 in this embodiment has three mixed flow columns, and the three mixed flow columns 27 are respectively arranged opposite to the two hole-shaped nozzles 11 and the strip-shaped nozzle 12 of the nozzle 1 along the direction of the cross section of the pipe.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or component being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (8)
1. An injection pipe component comprises a nozzle and an injection pipe which are sequentially arranged along the flowing direction of fuel gas, and is characterized in that the injection pipe is provided with a contraction section and a horizontal section, a partition plate unit is arranged in the horizontal section of the injection pipe along the flowing direction of the fuel gas to partition a plurality of fuel gas channels, the confluence positions of two adjacent fuel gas channels are arranged along the flowing direction of the fuel gas in a staggered way,
the partition plate unit comprises a plurality of longitudinal partition plates, the longitudinal partition plates are arranged along the radial direction of the horizontal section, the two adjacent longitudinal partition plates and the pipe wall of the injection pipe enclose the gas channel,
the baffle unit comprises an annular baffle plate, the annular baffle plate is enclosed into a gas channel, the annular baffle plate extends along the axial direction of the horizontal section, and the longitudinal baffle plates surround the annular baffle plate and are respectively connected with the annular baffle plate.
2. The ejector tube assembly according to claim 1, wherein a surface of the longitudinal partition is provided with a communication hole where the two gas passages on both sides of the longitudinal partition can converge.
3. The ejector tube assembly of claim 2, wherein the communication holes of the two longitudinal partitions located on both sides of the gas passage are arranged in a relative offset manner in a gas flow direction.
4. The ejector tube assembly of claim 1, wherein two adjacent gas passages on opposite sides of the longitudinal partition converge at the distal end of the longitudinal partition, the distal ends of the longitudinal partitions being offset in the direction of gas flow.
5. The ejector tube assembly of claim 1, wherein a plurality of the fuel gas passages can merge at the ends of the partitions, and the ends of the annular partitions are located after the ends of all of the longitudinal partitions in the fuel gas flow direction.
6. The ejector tube assembly of claim 1, wherein the nozzle has a plurality of hole-shaped orifices, the partition units are arranged in one-to-one correspondence with the hole-shaped orifices, the hole-shaped orifices are arranged toward the annular partition of the corresponding partition unit, and the position layout of the partition unit in the horizontal section is the same as the position layout of the hole-shaped orifices in the nozzle.
7. The ejector tube assembly of claim 6, wherein the nozzle further comprises a strip-shaped orifice disposed between any two adjacent orifice-shaped orifices.
8. The ejector tube assembly of claim 7, wherein adjacent longitudinal partitions of two of the partition units together define an auxiliary fuel gas passage, and the strip-shaped ports are disposed toward the auxiliary fuel gas passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910462738.2A CN112013394B (en) | 2019-05-30 | 2019-05-30 | Injection pipe assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910462738.2A CN112013394B (en) | 2019-05-30 | 2019-05-30 | Injection pipe assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112013394A CN112013394A (en) | 2020-12-01 |
| CN112013394B true CN112013394B (en) | 2021-08-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910462738.2A Active CN112013394B (en) | 2019-05-30 | 2019-05-30 | Injection pipe assembly |
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| Country | Link |
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| CN (1) | CN112013394B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5156542A (en) * | 1990-06-05 | 1992-10-20 | Develop, Reiner Hannen & Cie | Heat gun |
| CN205655297U (en) * | 2016-04-22 | 2016-10-19 | 浙江炬炼热能设备制造有限公司 | Honeycomb formula air and gas premixing device |
| CN108954305A (en) * | 2018-08-15 | 2018-12-07 | 山东中科天健环保科技有限公司 | A kind of novel hierarchical burning low nitrogen oxide burner structure |
| CN109798521A (en) * | 2017-11-16 | 2019-05-24 | 华帝股份有限公司 | Multi-channel ejector for gas stove, burner and gas stove |
-
2019
- 2019-05-30 CN CN201910462738.2A patent/CN112013394B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5156542A (en) * | 1990-06-05 | 1992-10-20 | Develop, Reiner Hannen & Cie | Heat gun |
| CN205655297U (en) * | 2016-04-22 | 2016-10-19 | 浙江炬炼热能设备制造有限公司 | Honeycomb formula air and gas premixing device |
| CN109798521A (en) * | 2017-11-16 | 2019-05-24 | 华帝股份有限公司 | Multi-channel ejector for gas stove, burner and gas stove |
| CN108954305A (en) * | 2018-08-15 | 2018-12-07 | 山东中科天健环保科技有限公司 | A kind of novel hierarchical burning low nitrogen oxide burner structure |
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| CN112013394A (en) | 2020-12-01 |
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