CN106881214A - One kind is introduced tangentially into spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle - Google Patents
One kind is introduced tangentially into spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle Download PDFInfo
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- CN106881214A CN106881214A CN201710230186.3A CN201710230186A CN106881214A CN 106881214 A CN106881214 A CN 106881214A CN 201710230186 A CN201710230186 A CN 201710230186A CN 106881214 A CN106881214 A CN 106881214A
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- chamber
- flange body
- air jet
- spiral
- jet system
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
- B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
- B05B7/0433—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of gas surrounded by an external conduit of liquid upstream the mixing chamber
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Abstract
Spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle, including feed space, spin chamber and shower nozzle are introduced tangentially into the invention discloses one kind；The feed space is made up of coaxial double-layered cylinder, inner cylindrical into chamber be gas passage, outer cylindrical into chamber be fluid passage；Feed space and spin chamber are connected by flange body, the spin chamber is made up of vortex chamber and four baffles, spin chamber is connected with shower nozzle, it is divided into contraction section, venturi and expansion segment inside shower nozzle, contraction section is connected with vortex chamber, the tapered hole exits of taper air jet system just to the annular groove on shower nozzle contraction section inwall, can improve atomizing effect；Vibration spring plate is provided with the middle part of contraction section；Venturi two ends are in smoothing junction with contraction section, expansion segment respectively.The present invention is accelerated in inserting the liquid into spin chamber, then the gas accelerated with taper air jet system carries out mixed aerosol, and the droplet particles of atomization then are carried out into cutting by vibration spring plate breaks up, aggravation atomization, is sprayed from nozzle divergence section, increases contact area.
Description
Technical field
Spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle is introduced tangentially into the present invention relates to one kind, it is adaptable to two kinds of gas and liquid
The atomization of medium.Belong to gas-liquid mass transfer technical field.
Background technology
Atomizer is that liquid is broken up a kind of device for nebulizing, and the nozzle species of current China's manufacture is various, but greatly
Part all has that complex structure, stability are bad, nozzle is easily blocked, gas and liquid undercompounding and cannot make atomization
Particle more granular the problems such as, this not only have impact on the quality of equipment but also greatly reduces operating efficiency.
Atomizer is widely used in fields such as depositing dust, workshop humidification, spraying, domestics, commonly uses at present
Settled in dust, in order to improve the efficiency of sedimentation, it is necessary to which atomizing particle can fully be combined with dust granules, so that
Reach the purpose of depositing dust.
The content of the invention
The present invention is intended to provide one kind is introduced tangentially into spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle, first by vortex chamber
Portion carries out eddy flow acceleration, gas-liquid is sufficiently mixed generation atomizing effect, and the atomizing particle for flowing through is entered by vibration spring plate then
Row cutting is broken up, and atomization is aggravated with this.
One kind that the present invention is provided is introduced tangentially into spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle, including feed space, spin chamber
And shower nozzle；The feed space is made up of coaxial double-layered cylinder, inner cylindrical into chamber be gas passage, outer cylindrical into
Chamber is fluid passage；Feed space and spin chamber are connected by flange body, and flange body is disc structure, equal radial direction on flange body
Eight oblique through holes are uniformly distributed at spacing；
The spin chamber is made up of vortex chamber and four baffles, and wherein baffle is by the knot of the reaping hook shape that height is 1mm
Structure is constituted, and the radially even distribution of baffle, vortex chamber is the cavity surrounded by four baffles；
The center of flange body is provided with screwed hole, and the inner cylinder of feed space sequentially passes through the eddy flow of the centre bore of flange body, spin chamber
Chamber, other end connection taper air jet system, the left end of taper air jet system is cylinder linkage section, the hole inside cylinder linkage section with
The inner chamber of taper air jet system is in smoothing junction, and the center of the taper air jet system conical surface is distributed uniformly and circumferentially tapered hole；
Spin chamber is connected with shower nozzle, and shower nozzle outside is truncated cone-shaped, and inside is divided into contraction section, venturi and expansion segment, contraction section and rotation
Stream chamber connection, contraction section is provided with annular groove at distance starting 1 ~ 1.5mm of position, and the tapered hole exits of taper air jet system are just right
Annular groove on shower nozzle inwall, improves atomizing effect；Vibration spring plate is provided with the middle part of contraction section；Venturi two ends respectively and shrink
Section, expansion segment are in smoothing junction.
In said apparatus, feed space is forge piece of step type structure with flange body junction, and step trough inwall is provided with screw thread, with flange
The external screw thread connection of body and spin chamber；Internal thread is provided with the centre bore of the flange body, is correspondingly provided with the outside of inner cylinder outer
Screw thread, the externally threaded length is 3 ~ 5mm, and the two is connected through a screw thread.
In said apparatus, the taper air jet system is pyramidal structure, and cone angle part is provided with external screw thread, the gas with inner cylinder
The internal thread connection of body passage, internal thread length is 0.6 ~ 0.8mm；The expansion segment male cone (strobilus masculinus) wall thickness 0.6mm of taper air jet system,
Bottom surface wall thickness 0.4mm, inner hollow, and male cone (strobilus masculinus) middle are uniformly distributed eight identical tapered holes.
In said apparatus, the inner cylinder of feed space stretches out 3 ~ 5mm of flange body outside, inner cylinder end and taper air jet system
Cylinder linkage section external screw thread connection, the external thread length of cylinder linkage section is 0.6 ~ 0.8mm.
In said apparatus, on the flange body radial direction spacing be 6.5mm at be uniformly distributed eight center lines of oblique through hole and
The angle of flange body axis is 20 ~ 50 °.
In said apparatus, the baffle that the sickleshaped structure that four height are 1mm is constituted is provided with described spin chamber, led
The middle part of fluid forms vortex chamber, one is formed between baffle and eddy flow chamber interior walls and encloses tank, makes fluid recycle stream in the sink
Dynamic, baffle constitutes drainage channel between any two, and the fluid in tank can be introduced into vortex chamber carries out acceleration eddy flow.
In said apparatus, the vibration spring plate of the shower nozzle contraction section is the trapezoidal thin slice of stainless steel, and its thickness is 0.1mm,
Four are evenly arranged along same circumferencial direction on the internal face of contraction section, nozzle contraction section inwall is connected in by welding manner
On, its effect is to carry out cutting to the fluid for passing through to break up, and reduces atomizing particle, carries out secondary-atomizing, improves atomizing effect.
In said apparatus, the tapered hole of the taper air jet system is uniformly provided with eight along taper surface, accelerates gas and sprays；
The tapered centerline hole of taper air jet system and the angle of flange body axis are 65 ~ 80 °.
In said apparatus, the expansion segment angle of the shower nozzle is maintained at 60 ~ 120 °, can effectively expand atomisation area, carries
High atomizing efficiency.
Gas entrance passage in the present invention is coordinated with flange body using gap, can adjust gas passage with flange body
Relative position makes liquid be sufficiently mixed with gas, and interference fit is used with taper air jet system, prevents the gas from leaking.
Spin chamber in the present invention is attached with shower nozzle by the way of welding, sealing can be improved, so as to gas-liquid
Can be well into shower nozzle after mixing.
Beneficial effects of the present invention：
Vortex type high-efficient atomizer is introduced tangentially into by provided by the present invention, can insert the liquid into carry out in spin chamber
Eddy flow accelerates, then the gas accelerated with taper air jet system carries out mixed aerosol, and the droplet particles that then will be atomized are by vibration
Shell fragment carries out cutting and breaks up, aggravation atomization, is finally sprayed from nozzle divergence section, increases contact area, improves atomizing effect.Nozzle
Atomizing effect be better than plain nozzle, the effect of plain nozzle high pressure can be reached in the case of entrance low pressure；Its atomization effect
It is really good, convenient disassembly, it is not easy to block and leak.
Brief description of the drawings
Fig. 1 is the entirety sectional view that the present invention is introduced tangentially into spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle；
Fig. 2 is partial enlarged view at A in Fig. 1；
Fig. 3 is the stereogram of spin chamber；
Fig. 4 is the stereogram of flange body.
In figure：1- liquid inlets；2- fluid passages；3- feed spaces；4- flange bodies；The screw threads of 5- first；6- spin chambers；7- sprays
Head；8- contraction sections；9- venturis；10- expansion segments；11- vibration spring plates；12- taper air jet systems；The screw threads of 13- second；14- gases
Passage；15- gas accesses；16- annular grooves；The tapered holes of 17-；18- tanks；19- baffles；20- drainage channels；21- vortex chambers；
The oblique through holes of 22-；23- centre bores.
Specific embodiment
The present invention is further illustrated below by embodiment, but is not limited to following examples.
Embodiment 1：
Fig. 1 shows a kind of structure for being introduced tangentially into spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle.One kind is introduced tangentially into spiral-flow type
Include gas passage 14, method in gas-liquid mixed high-efficiency atomizing nozzle, including feed space 3, spin chamber 6, shower nozzle 7, the feed space 3
Blue body 4, gas passage 14 and the interference fit of taper air jet system 12 prevent air-flow from exposing, and feed space 3 and spin chamber 6 are by the
One screw thread 5 is assembled, and baffle 19 is provided with spin chamber 6, and the main body of spin chamber 6 is connected with shower nozzle 7 by way of welding
Together.
Fig. 2 show main nebulization region, when liquid is come out to up at this from spin chamber 6, can be produced in central area
Low-pressure area, so that be easier to introduce a gas into, while being provided with equally distributed eight on the taper surface of taper air jet system 12
Tapered hole 17, can effectively accelerate gas ejection, and last gas mixes with liquid, and aggravates mist in the presence of annular groove 16
Change, improve atomizing effect.
Spin chamber 6 shown in Fig. 3 is contained within tank 18, and it is all the sickleshaped baffle 19 of 1mm that inside is provided with four height, with
And introduce fluid into the drainage channel 20 of vortex chamber 21.
Fig. 4 show flange body 4, and centre is provided with threaded centre bore 23 for accessing gas passage 14, at it radially
Distance at 6.5mm uniform eight oblique through holes 22 introduce fluid.
The body ends internal face of the feed space 3 is provided with internal thread, and reach is 4.5mm, with flange body 4 and spin chamber
6 external screw thread is connected by the first screw thread 5, and the centre bore 23 of flange body 4 is provided with internal thread, and gas passage 14 is provided with outer spiral shell
Line, both are attached by the second screw thread 13, and externally threaded length is 2 ~ 3mm on gas passage 14.Taper air jet system 12
Cylinder linkage section be provided with external screw thread, the internal thread with gas passage 14 is connected, the internal thread length of gas passage 14 for 0.6 ~
0.8mm。
The thickness of the inner flange body 4 of the feed space 3 be 1.5mm, a diameter of 15mm of fluid passage 2, gas passage 14
Diameter of bore is 1mm, centre bore 23 a diameter of 1.2mm, a diameter of 2mm of oblique through hole 22 of flange body 4, and each oblique through hole
The distance of 22 to centre bore 23 is all 6.5mm, and each oblique through hole 22 faces the tank 18 of spin chamber 6, and liquid is improved with this
The abundant mobility of body.
The center line of oblique through hole 22 of the flange body 4 and the axis angle of centre bore 23 of flange body 4 are 20 ~ 50 °, can be by
Liquid is imported into the tank 18 of spin chamber 6, liquid is fully circulated herein.The taper air jet system 12 it is tapered
The center line of hole 17 is 65 ~ 80 ° with the angle of the axis of flange body 4.
The depth of annular groove 16 of described shower nozzle contraction section 8 is 0.5mm, and width is 0.8mm.The inner face of annular groove 16 is just right
The tapered hole 17 of taper air jet system 12.The vibration spring plate 11 at least four of shower nozzle contraction section 8, thickness is 0.1mm, by welding
Mode is connected on the inwall of shower nozzle 7.
Described gas passage 14 is coordinated with flange body 4 using gap, can adjust the phase of gas passage 14 and flange body 4
Liquid is set to be sufficiently mixed with gas to position.Gas passage 14 uses interference fit with taper air jet system 12, prevents
Gas is leaked.
Described spin chamber 6 is attached with shower nozzle 7 by the way of welding, effectively improves sealing, so that gas-liquid is mixed
In can be well into shower nozzle 7 after conjunction, be finally sprayed from the venturi 9 and expansion segment 10 of shower nozzle 7.
The assembly method for being introduced tangentially into spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle.First based on shower nozzle 7
Parts, vibration spring plate 11 is welded on the inwall of shower nozzle contraction section 8, is then welded to the main body of spin chamber 6 after treatment
On the left side of shower nozzle 7.Taper air jet system 12 is screwed into the end of gas passage 14, gas passage 14 is then connected to flange body
In 4, and the distance stretched out is regulated, during the flange body 4 of installation then fitted into the end thread of the main body of feed space 3,
Finally the main body of spin chamber 6 after welding and the main body of shower nozzle 7 are assembled in the end thread of the main body of feed space 3 and tightened, it is ensured that with
Flange body is seamlessly connected, and is finally completed general assembly.
After component assembly, gas passage 14 connects taper air jet system 12 and shower nozzle contraction section 8, the communicating method of fluid passage 2
The oblique through hole 22 of blue body 4, spin chamber 6 and shower nozzle contraction section 8.Liquid enters from fluid passage entrance 1, after accelerated, drainage
Spin chamber 6 is reached, secondary acceleration is then carried out into vortex chamber 21 by drainage channel 20, and shrink in vortex chamber 21 and shower nozzle
The central area of section 8 produces low pressure, makes gas be easier to be injected into.Gas then enters from gas access 15, through gas passage 14
Into taper air jet system 12, the ejection of gas is accelerated in the presence of tapered hole 17, mixed with liquid and be atomized, while
Strengthen atomizing effect in the case where the annular groove 16 of shower nozzle contraction section 8 is acted on, then broken up through the cutting of vibration spring plate 11, reduce atomization
Particle eventually passes venturi 9 and expansion segment 10 sprays so as to aggravation atomization again, and expansion segment 10 increased atomization coverage,
Improve nebulization efficiency.
Claims (9)
1. one kind is introduced tangentially into spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle, it is characterised in that：Including feed space, spin chamber and spray
Head；The feed space is made up of coaxial double-layered cylinder, inner cylindrical into chamber be gas passage, outer cylindrical into chamber
It is fluid passage；Feed space and spin chamber are connected by flange body, and flange body is disc structure, equal radial direction spacing on flange body
Place is uniformly distributed eight oblique through holes；
The spin chamber is made up of vortex chamber and four baffles, and wherein baffle is by the knot of the reaping hook shape that height is 1mm
Structure is constituted, and the radially even distribution of baffle, vortex chamber is the cavity surrounded by four baffles；
The center of flange body is provided with screwed hole, and the inner cylinder of feed space sequentially passes through the eddy flow of the centre bore of flange body, spin chamber
Chamber, other end connection taper air jet system, the left end of taper air jet system is cylinder linkage section, the hole inside cylinder linkage section with
The inner chamber of taper air jet system is in smoothing junction, and the center of the taper air jet system conical surface is distributed uniformly and circumferentially tapered hole；
Spin chamber is connected with shower nozzle, and shower nozzle outside is truncated cone-shaped, and inside is divided into contraction section, venturi and expansion segment, contraction section and rotation
Stream chamber connection, contraction section is provided with annular groove at distance starting 1 ~ 1.5mm of position, and the tapered hole exits of taper air jet system are just right
Annular groove on shower nozzle inwall, can improve atomizing effect；Vibration spring plate is provided with the middle part of contraction section；Venturi two ends respectively and shrink
Section, expansion segment are in smoothing junction.
It is 2. according to claim 1 to be introduced tangentially into spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle, it is characterised in that：Feed space
It is forge piece of step type structure with flange body junction, step trough inwall is provided with screw thread, and the external screw thread with flange body and spin chamber is connected；Institute
State and internal thread be provided with the centre bore of flange body, external screw thread is correspondingly provided with the outside of inner cylinder, the externally threaded length be 3 ~
5mm, the two is connected through a screw thread.
It is 3. according to claim 1 to be introduced tangentially into spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle, it is characterised in that：Feed space
Inner cylinder stretch out 3 ~ 5mm of flange body outside, inner cylinder end is connected with the external screw thread of the cylinder linkage section of taper air jet system,
The external thread length of cylinder linkage section is 0.6 ~ 0.8mm.
It is 4. according to claim 1 to be introduced tangentially into spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle, it is characterised in that：The cone
The conical surface wall thickness of the expansion segment of shape air jet system is 0.6mm, and bottom surface wall thickness is 0.4mm.
It is 5. according to claim 1 to be introduced tangentially into spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle, it is characterised in that：The method
Radial direction spacing is that eight oblique through holes are uniformly distributed at 6.5mm on blue body, and its center line is 20 ~ 50 ° with the angle of flange body axis.
It is 6. according to claim 1 to be introduced tangentially into spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle, it is characterised in that：Described
Be provided with the baffle of the sickleshaped structure that four height are 1mm in spin chamber, the middle part of baffle forms vortex chamber, baffle with
One is formed between eddy flow chamber interior walls and encloses tank, fluid is circulated in the sink, baffle constitutes drainage channel between any two,
Fluid in tank can be introduced into vortex chamber carries out acceleration eddy flow.
It is 7. according to claim 1 to be introduced tangentially into spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle, it is characterised in that：The spray
The vibration spring plate of head contraction section is the trapezoidal thin slice of stainless steel, and its thickness is 0.1mm, along same on the internal face of contraction section
Circumferencial direction uniform welding four.
It is 8. according to claim 1 to be introduced tangentially into spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle, it is characterised in that：The cone
The tapered hole of shape air jet system is uniformly provided with eight along taper surface, accelerates gas and sprays；The tapered hole of the taper air jet system
Center line is 65 ~ 80 ° with the angle of flange body axis.
It is 9. according to claim 1 to be introduced tangentially into spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle, it is characterised in that：The spray
The expansion segment angle of head is maintained at 60 ~ 120 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710230186.3A CN106881214B (en) | 2017-04-10 | 2017-04-10 | One kind being introduced tangentially into spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710230186.3A CN106881214B (en) | 2017-04-10 | 2017-04-10 | One kind being introduced tangentially into spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106881214A true CN106881214A (en) | 2017-06-23 |
| CN106881214B CN106881214B (en) | 2019-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710230186.3A Expired - Fee Related CN106881214B (en) | 2017-04-10 | 2017-04-10 | One kind being introduced tangentially into spiral-flow type gas-liquid mixed high-efficiency atomizing nozzle |
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| CN (1) | CN106881214B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107261706A (en) * | 2017-07-31 | 2017-10-20 | 刘明谭 | A kind of atomizing road dedusting purging system |
| CN107907003A (en) * | 2017-11-01 | 2018-04-13 | 上海伏波环保设备有限公司 | The atomizer of forvacuum room |
| CN109482380A (en) * | 2018-12-24 | 2019-03-19 | 亿川科技(成都)有限责任公司 | A kind of mixed-flow multistage steam atomizer |
| CN110314776A (en) * | 2019-08-02 | 2019-10-11 | 中国人民解放军96771部队 | One kind can self-cleaning spray head |
| CN110790232A (en) * | 2019-12-04 | 2020-02-14 | 清华大学 | Liquid fuel catalytic reforming device |
| CN110947532A (en) * | 2019-11-19 | 2020-04-03 | 太原理工大学 | Vortex excitation nozzle with elastic vibrating piece cavity |
| CN111214918A (en) * | 2020-03-16 | 2020-06-02 | 刘时章 | Atomization mixer for waste gas coagulation treatment |
| CN111823394A (en) * | 2020-07-01 | 2020-10-27 | 广州绿邦环境技术有限公司 | Resource utilization equipment for household garbage incineration fly ash and treatment process thereof |
| CN112369922A (en) * | 2020-10-10 | 2021-02-19 | 华帝股份有限公司 | Atomizing nozzle, steam generator and steam cooking equipment |
| CN113019735A (en) * | 2021-05-10 | 2021-06-25 | 中国矿业大学 | A mix formula step reinforcing atomizing device in rotation for dust fall |
| CN114856767A (en) * | 2022-05-11 | 2022-08-05 | 广西博盛迪科技有限公司 | Atomizing structure and sprayer |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107261706A (en) * | 2017-07-31 | 2017-10-20 | 刘明谭 | A kind of atomizing road dedusting purging system |
| CN107907003A (en) * | 2017-11-01 | 2018-04-13 | 上海伏波环保设备有限公司 | The atomizer of forvacuum room |
| CN109482380A (en) * | 2018-12-24 | 2019-03-19 | 亿川科技(成都)有限责任公司 | A kind of mixed-flow multistage steam atomizer |
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| CN110314776A (en) * | 2019-08-02 | 2019-10-11 | 中国人民解放军96771部队 | One kind can self-cleaning spray head |
| CN110947532B (en) * | 2019-11-19 | 2021-05-04 | 太原理工大学 | Vortex excitation nozzle with elastic vibrating piece cavity |
| CN110947532A (en) * | 2019-11-19 | 2020-04-03 | 太原理工大学 | Vortex excitation nozzle with elastic vibrating piece cavity |
| CN110790232A (en) * | 2019-12-04 | 2020-02-14 | 清华大学 | Liquid fuel catalytic reforming device |
| CN111214918A (en) * | 2020-03-16 | 2020-06-02 | 刘时章 | Atomization mixer for waste gas coagulation treatment |
| CN111823394A (en) * | 2020-07-01 | 2020-10-27 | 广州绿邦环境技术有限公司 | Resource utilization equipment for household garbage incineration fly ash and treatment process thereof |
| CN112369922A (en) * | 2020-10-10 | 2021-02-19 | 华帝股份有限公司 | Atomizing nozzle, steam generator and steam cooking equipment |
| CN113019735A (en) * | 2021-05-10 | 2021-06-25 | 中国矿业大学 | A mix formula step reinforcing atomizing device in rotation for dust fall |
| CN114856767A (en) * | 2022-05-11 | 2022-08-05 | 广西博盛迪科技有限公司 | Atomizing structure and sprayer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106881214B (en) | 2019-02-22 |
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