CN108800135A - A kind of adjustable confining pressure injection enters sudden expansion cavate GAS/AIR Proportional pre-mixed configuration - Google Patents
A kind of adjustable confining pressure injection enters sudden expansion cavate GAS/AIR Proportional pre-mixed configuration Download PDFInfo
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- CN108800135A CN108800135A CN201710314451.6A CN201710314451A CN108800135A CN 108800135 A CN108800135 A CN 108800135A CN 201710314451 A CN201710314451 A CN 201710314451A CN 108800135 A CN108800135 A CN 108800135A
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- Prior art keywords
- air
- gas
- sudden expansion
- expansion chamber
- chamber
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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
-
- 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
-
- 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
Abstract
The present invention relates to a kind of adjustable confining pressure injections to enter sudden expansion cavate GAS/AIR Proportional pre-mixed configuration, including：Air chamber,Gas nozzle,Sudden expansion chamber,Gaseous-pressure control unit,Air pressure control components,The air chamber and sudden expansion chamber close to,Intermediate throughholes are sudden expansion chamber entrance,Gas nozzle is placed in air chamber,Outlet alignment sudden expansion chamber entrance,Sudden expansion chamber entrance can have any shape,Cavity diameter is more than the full-size of entrance shape,Sudden expansion chamber outlet size is equal to or slightly less than cavity size,Exit can nearby add bluff body and generate flow-disturbing,It is controllable that air chamber confining pressure is adjustable,It is controllable that nozzle exit pressure is adjustable,By the correspondence for establishing air chamber confining pressure and gas nozzle pressure,Or the parameter correspondence of gas/air Pressure Control Unit,Gas quantity and the flowrate proportioning of air capacity can be established,Realize that gas/air enters sudden expansion chamber in proportion,And it can carry out self-excited oscillation type in sudden expansion intracavitary or force disturbed flow type premix,Gas is exported from outlet after mixing.
Description
Technical field
The present invention relates to a kind of gas/air premix technology, specifically a kind of adjustable confining pressure injection suitable for stove into
Enter sudden expansion cavate GAS/AIR Proportional pre-mixed configuration.
Background technology
At present gas furnace generally by air (i.e. primary air) needed for gaseous-pressure injection part, hot spots by
Flame completes burning from the method for surrounding sucking remaining air (i.e. auxiliary air).Because of the sendout of primary air and auxiliary air
It is difficult control, the primary air amount being typically supplied is less than theoretical air requirement, and secondary air supply and Range structure and uses ring
Border strong correlation or be more than theoretical air requirement, cause flame combustion temperature reduction, bring thermal loss or deficiency, cause to fire
Burn incomplete, generation carbon black and excess CO etc., pollution cookware and environment etc.；And the pre-mixed configuration of combustion gas and primary air is generally adopted
With Venturi tube, overall dimensions are larger, and mixed effect and length of tube strong correlation restrict stove and develop to small size, Wu Fashi
Burning jamb structure should be closed.It is proposed within most several years technology and the side of GAS/AIR Proportional control and premix in many gas furnaces
Case has been summed up following several major class.
GAS/AIR Proportional control technology：
1. utilizing flowmeter：Air forced air supply, transmission flow meter establish proportion relation, by control system with gas quantity
Realize accurate proportioning.Program cost is higher, is not suitable for civil gas stoves.
2. using air-fuel ratio valve：Dedicated air/gas ratio mixing valve may be implemented accurately to match and adequately mix
It closes, is the preferred embodiment of industry and professional domain, but cost is very high, be not suitable for domestic stove.
3. indirect control：By blowing devices such as wind turbines, gas-air is ensured by the indirect association of air quantity and gas quantity
Proportioning such as uses speed-regulating fan, and because fan speed and air quantity are there are single mapping, there is also single with gas quantity for gas valve aperture
Mapping can theoretically establish the relativity of different gas valve apertures and fan speed, realize that required gas-air matches, because
The non-linear and system deviation of mapping, there are certain proportioning misalignment rates for this method, are preferably adjusted by certain feedback closed loop,
The program is at low cost, is very suitable for civil gas stoves.
Gas/air premixes technology：
A. Venturi tube and various modifications：This is a kind of pipe of gradual change diameter, and angle is smaller, needs certain length ability
Realization is sufficiently mixed；Various modifications pipe includes the methods of being bent, turning back to reduce length dimension, such as patent No.
The Venturi tube that 201410508958.1 Chinese patent " gas utensil of full premix combustion " is deformed using bending flaring.Its
Essence is to reduce flow velocity by expanding caliber, increase the pipe range extension time, and the main naturally osmotic ability using gas (transport by molecule
It is dynamic), keep diffusion more abundant.
B. forced disturbance：It is mixed by external force, if wind turbine air blast and gaseous-pressure make two kinds of air-flows cross by force mixing, i.e.,
Disturbance is formed using air-flow momentum except natural diffuseness power, the mixing in small space may be implemented in this mode, but due to air-flow
Complexity and uncertainty, it is insufficient to be susceptible to local mixing.
C. water conservancy diversion/turbulence structure is utilized：Water conservancy diversion/turbulence structure body is utilized two kinds of air-flow mixed zones, such as flow deflector, flow-disturbing
Ring etc. makes two kinds of air-flows form turbulent flow/turbulent flow and realizes fully interaction, such as the Chinese patent of the patent No. 201620621781.0
" gas stove gas-air Forced Mixing burner ", the program can also realize the premix in small space, but water conservancy diversion/disturb
The theoretical complex of stream, the design and realization of structure are very big.
The above GAS/AIR Proportional control and hybrid technology have respective advantage and disadvantage and suitable application area, as civilian production
The gas furnace field of product has the requirement different from industrial circle, especially cost cannot be too high cost and performance, restricts
The development of stove.
Invention content
The object of the present invention is to provide a kind of adjustable confining pressure injections to enter sudden expansion cavate GAS/AIR Proportional pre-mixed configuration, fits
For all kinds of gas furnaces, by air chamber, gas nozzle, sudden expansion chamber, air confining pressure control unit and gaseous-pressure control unit
Composition.
To achieve the above object, according to an aspect of the present invention, the air chamber inner air pressure penetration and combustion are utilized
Gas injection collective effect sucks enough air and enters the sudden expansion chamber, and forms jet stream self-excited oscillation type or pressure in sudden expansion intracavitary
Disturbed flow type premixes.Last century end is found that sudden expansion chamber jet stream self-oscillation phenomenon, and it makes use of the elasticities of fluid and fluid resonant shape
At vortex, being sufficiently mixed for two kinds of gases of realization is inhaled using the volume of vortex, than traditional natural diffusion type and forces air-flow hybrid
Premix has incomparable advantage, has begun gradually to apply in industrial circle, but on the product for civilian use especially gas furnace
It there is no application.
The air chamber is that there are one the closed cavitys of air inlet and an air outlet for band, installs in air inlet and actively send
Wind devices keep it internal full of air, air outlet i.e. the sudden expansion chamber entrance, and symmetrical center positions are equipped with the combustion gas
Nozzle (injection head), Pressure Control Unit described in blowing device band make the air chamber inner air pressure (injection confining pressure) can be
Adjustment, can be used adjustable speed fan or other equipment in a certain range；
Electromagnetic gas proportioning valve can be used in the gaseous-pressure control unit, keeps gas quantity adjustable.For ensure gas quantity with
Air capacity meets the theory demands of burning, needs the correspondence for establishing air confining pressure value and pressure value before gas nozzle, if
Using adjustable speed fan control air confining pressure, adjust voltage-type solenoid valve control gas nozzle pressure, then can be converted into fan speed and
The correspondence of solenoid valve control voltage is (if air uses throttle type pressure regulation, combustion gas to use knob control valve pressure regulation, then need
It is adjusted to corresponding control parameter and establishes mapping relations).
The sudden expansion chamber is expansion type premix chamber, is slightly less than much smaller than cavity size, outlet size for entrance equivalent size
Cavity size, all round closure formula cavity body structure.As cavity length L and cavity diameter D ratios L/D=2.0~2.8, it is easiest to produce
It is born from Induced Oscillation；Entrance shape also has a significant effect to generating self-oscillation, can be the various shapes such as circle, triangle, rectangle
Shape easy tos produce oscillation when the two-dimensional characteristics of shape are apparent；When sudden expansion chamber outlet size is consistent with inside cavity size, very
Induced Oscillation is born from difficult labour, it is necessary to be forced flow-disturbing by bluff body, therefore generally be used smaller skirt border structure；When because size limitation can not
When meeting self-oscillation requirement, can bluff body be set near exit, so that air-flow is generated vortex or turbulent flow by bluff body, enhancing is expanded
It dissipates, bluff body shape can refer to various water conservancy diversion/turbulence structures, and size should not be too large, and avoid system resistance or pressure drop excessive.
Compared with the prior art, the invention has the advantages that：
This method has broad applicability and design flexibility in gas furnace.
Realize that device simple in structure is simple, it is at low cost.
Description of the drawings
Fig. 1 is the sectional view of one basic structure of the embodiment of the present invention
Fig. 2 is the sectional view of two basic structure of the embodiment of the present invention
Specific implementation mode
Embodiment one：There is partition board (12) among air chamber (13) and sudden expansion chamber (11) in Fig. 1, circle is provided among partition board (12)
Shape through-hole (sudden expansion chamber entrance), gas nozzle (14) is placed in air chamber (13), the alignment of the circular through hole center of partition board (12) with
Gas nozzle (14), the lower termination electromagnetic gas proportioning valve (15) of gas nozzle (14), sudden expansion chamber (11) outlet size are away from chamber
The contraction mouth of the back gauges such as body wall face, fixed using thin plate (10), size has following approximate ratio relationship：Sudden expansion chamber diameter D/ enters
Mouth diameter d1>5, sudden expansion cavity length L/ diameter D=2.7, sudden expansion chamber outlet diameter d2/ sudden expansion chamber diameters D=0.7.Air chamber
(13) air in is provided by aerofoil fan (16), and air confining pressure controls by adjusting fan (16) speed, adjusts electromagnetism ratio
The voltage of example valve (15) can be adjusted the pressure and gas quantity of gas nozzle.
Combustion gas injection air capacity needs to establish correspondence by experiment in air chamber (13), and theoretically, gaseous-pressure is not
When change, sudden expansion chamber (11) inlet diameter is bigger or air confining pressure is bigger, and the air capacity into sudden expansion chamber (11) is bigger, and air encloses
Fuel gas injection speed is faster when pressing constant, then injection air is more.It, can be by establishing electromagnetic proportional valve in actual system design
(15) mapping relations of voltage and fan (16) speed are controlled, you can gas quantity and the correspondence of air capacity are established, it is this to reflect
It is one-to-one biaxial stress structure to penetrate, but and it is non-linear, because nozzle exit pressure variation and fan speed it is constant when, the air capacity of injection
Also can change, i.e., the two has coupling effect, so can pass through look-up table or sectional linearization approximate value in use.
The size relationship of this example sudden expansion chamber (11) meets jet stream self-oscillation condition, so need not can be effective using bluff body
After entering sudden expansion chamber (11) self-oscillation will occur for mixing, combustion gas injection air, and precession jet-flow, can by rolling up suck
Realization is sufficiently mixed.
The advantages of this programme is that generation self-oscillation after-burning gas/air mixing is very abundant, but size is larger.
Embodiment two：There is partition board (22) among air chamber (23) and sudden expansion chamber (21) in Fig. 2, square is provided among partition board (22)
Shape through-hole (sudden expansion chamber entrance) forms expansion type cavity, and gas nozzle (24) is directed at rectangle entrance center, gas nozzle (24)
Lower termination electromagnetic gas proportioning valve (25), sudden expansion chamber (21) outlet for away from cavity wall surface it is equilateral away from contraction mouth, using thin plate
(20) fixed, sudden expansion inside cavity fixes a small-sized disc-shaped baffle (27) below outlet, and support bar can be used and be connected to
Outlet edge, the long L/ diameters D of chamber of sudden expansion chamber<2.0, long side/short side=10 of rectangular aperture, other sizes approximation example one；It is logical
The voltage for crossing adjustment electromagnetic proportional valve (25) can be adjusted the pressure and gas quantity of gas nozzle, the air of air chamber (23) by from
Heart fan (26) provides, and air confining pressure controls by adjusting fan (26) speed.
Proportionate relationship into air capacity and gas quantity in sudden expansion chamber (21) can be indirectly by the speed and electricity of fan (26)
The voltage correspondence of magnetic proportioning valve (25) obtains, similar with embodiment one to need to establish mapping relations by experiment.
The size of sudden expansion chamber (21) is unsatisfactory for self-oscillation condition in this example, in order to more preferably realize mixing, in sudden expansion chamber
(21) small front apron (27) is added in exit, and the baffle is preferably internal close to exit in sudden expansion chamber (21), can be effectively formed
Flow-disturbing and vortex volume inhale effect, realize preferable mixing.
The small front apron (27) can be designed to various disturbed flow type structures, to increase mixed effect, or add water conservancy diversion simultaneously
Structure is to reduce gas-flow resistance；
The advantages of this programme is can to reduce sudden expansion chamber size, and mixed effect is also fine.
Above-described embodiment is only that the preferred embodiment of the present invention is described, not to the spirit and scope of the present invention
It is defined, under the premise of not departing from design philosophy of the present invention, technical side of the professional and technical personnel in the art to the present invention
The various changes and modifications that case is taken, all belong to the scope of protection of the present invention.
Claims (3)
1. a kind of adjustable confining pressure injection enters sudden expansion cavate GAS/AIR Proportional pre-mixed configuration, including：Gas nozzle (24), air
Chamber (23), sudden expansion chamber (21), air confining pressure control unit (26), gas flow control unit (25), optional bluff body (27), it is special
Sign is：The air chamber (23) has the partition board with through-hole to separate close to the sudden expansion chamber (21), centre, forms sudden expansion chamber (21)
Entrance, the gas nozzle (24) are placed in air chamber (23), and outlet alignment sudden expansion chamber (21) entrance, the sudden expansion chamber (21) enters
Mouth-shaped can be round or other abnormity, and cavity diameter is more than the full-size of entrance shape, sudden expansion chamber (21) outlet
Size is equal to or slightly less than cavity size, and the air confining pressure of the air chamber (23) is adjustable controllable, the gas nozzle (24)
Gaseous-pressure is also adjustable controllable, and air can enter sudden expansion chamber (21) under confining pressure and gaseous jet ejector action, pass through foundation
The correspondence of air chamber (23) confining pressure and gas nozzle (24) pressure, you can the flowrate proportioning for establishing gas quantity and air capacity closes
System, realizes that gas/air enters sudden expansion chamber (21) in proportion, self-excited oscillation type is carried out in sudden expansion chamber (21) or by bluff body
(27) disturbed flow type premix, mixed gas is forced to be exported from outlet.
2. adjustable confining pressure injection according to claim 1 enters sudden expansion cavate GAS/AIR Proportional pre-mixed configuration, feature exists
In：The sudden expansion chamber entrance equivalent diameter and air confining pressure directly affect air and enter sudden expansion chamber flow, equivalent diameter and confining pressure
More big then flow is bigger, and air chamber (23) the air confining pressure parameter adjustment can be converted into the parameters of operating part such as wind turbine for providing confining pressure
(26) adjustment of the adjustment of rotating speed, gas nozzle (24) the gaseous-pressure parameter can be converted into gas flow or pressure control portion
The adjustment of part parameter such as gas ratio valve (25) parameter, i.e., by establishing air confining pressure control unit parameter and gas flow/pressure
The correspondence of force control unit part parameter realizes the proportion relation of gas quantity and air capacity, i.e., by adjusting cavity body structure and sky
Different stoichiometric factors may be implemented in gas/combustion gas control unit parameter.
3. adjustable confining pressure injection according to claim 1 enters sudden expansion cavate GAS/AIR Proportional premixing method and structure,
It is characterized in that：The sudden expansion chamber (21) when meeting self-oscillatory condition without bluff body (27) can be realized gas/air by
The spontaneous diffusion mixing of ratio；, can be by increasing bluff body (27) near exit when cannot be satisfied self-oscillation condition, formation is disturbed
Dynamic vortex, realizes Forced Mixing in proportion.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710314451.6A CN108800135A (en) | 2017-05-06 | 2017-05-06 | A kind of adjustable confining pressure injection enters sudden expansion cavate GAS/AIR Proportional pre-mixed configuration |
| PCT/CN2018/083197 WO2018205797A1 (en) | 2017-05-06 | 2018-04-16 | Structure for proportionally premixing fuel gas and air introduced into sudden expansion cavity by means of adjustable confining pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710314451.6A CN108800135A (en) | 2017-05-06 | 2017-05-06 | A kind of adjustable confining pressure injection enters sudden expansion cavate GAS/AIR Proportional pre-mixed configuration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108800135A true CN108800135A (en) | 2018-11-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710314451.6A Pending CN108800135A (en) | 2017-05-06 | 2017-05-06 | A kind of adjustable confining pressure injection enters sudden expansion cavate GAS/AIR Proportional pre-mixed configuration |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108800135A (en) |
| WO (1) | WO2018205797A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5735681A (en) * | 1993-03-19 | 1998-04-07 | The Regents, University Of California | Ultralean low swirl burner |
| CN101893237A (en) * | 2010-07-29 | 2010-11-24 | 郑治原 | Mixing burner of ceramic kiln |
| CN204042894U (en) * | 2014-08-01 | 2014-12-24 | 冯翠宝 | A kind of gas burner improving gas mixed nub structure |
| CN104501150A (en) * | 2014-11-24 | 2015-04-08 | 吴江市格瑞福金属制品有限公司 | Novel energy-saving stove |
-
2017
- 2017-05-06 CN CN201710314451.6A patent/CN108800135A/en active Pending
-
2018
- 2018-04-16 WO PCT/CN2018/083197 patent/WO2018205797A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5735681A (en) * | 1993-03-19 | 1998-04-07 | The Regents, University Of California | Ultralean low swirl burner |
| CN101893237A (en) * | 2010-07-29 | 2010-11-24 | 郑治原 | Mixing burner of ceramic kiln |
| CN204042894U (en) * | 2014-08-01 | 2014-12-24 | 冯翠宝 | A kind of gas burner improving gas mixed nub structure |
| CN104501150A (en) * | 2014-11-24 | 2015-04-08 | 吴江市格瑞福金属制品有限公司 | Novel energy-saving stove |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018205797A1 (en) | 2018-11-15 |
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Application publication date: 20181113 |
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| WD01 | Invention patent application deemed withdrawn after publication |