CN103742915B - A kind of multi-cavity gas-air mixing arrangement - Google Patents
A kind of multi-cavity gas-air mixing arrangement Download PDFInfo
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- CN103742915B CN103742915B CN201410009996.2A CN201410009996A CN103742915B CN 103742915 B CN103742915 B CN 103742915B CN 201410009996 A CN201410009996 A CN 201410009996A CN 103742915 B CN103742915 B CN 103742915B
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Abstract
The invention provides a kind of multi-cavity gas-air mixing arrangement, including at least two hybrid chamber, each described hybrid chamber is respectively provided with the mixed gas outlet that air intake is connected with burner, each described hybrid chamber is built-in respectively is provided with gas pipeline, each described gas pipeline all offers combustion gas spout, intersecting towards with the air flow entered in described hybrid chamber of described combustion gas spout. The present invention is by effective for gas air mixer segmentation, it is achieved big load regulation rate, does not produce condensed water in each load section, improves system reliability and life-span. The built-in blast tube of the present invention had both achieved the active controlling switch channel fuel and had controlled, and reduces again the volume of blender, significantly reduces cost. And intersecting towards with the air flow entered in hybrid chamber of combustion gas spout of the present invention, makes combustion gas and air be sufficiently mixed.
Description
Technical field
The present invention relates to the multi-cavity gas-air mixing arrangement of a kind of gas heater being applied to full premix combustion, especially a kind of blender being capable of sectional combustion function, belong to technical field of water heaters.
Background technology
Full premix combustion system refers to and will carry out the system burnt after disposable to combustion gas and air mix homogeneously. It is characterized in that: have less excess air coefficient (namely actually required air capacity and the ratio of theoretical required air quantity, be generally less than 1.5), relatively low pollutant (NOx, CO) discharge, combustion intensity is big, flame is short, and the area thermic load of burning is relatively big, the multiple advantages such as combustion noise is little. In gas heater field, full premix combustion systematic difference has certain history, and along with the raising of various performance requirements, particularly country are increasingly stricter to the control of pollutant emission, its development prospect is comparatively optimistic.
But, existing full premix combustion system is not applied for on-condensing product. All-premixing burner and common partial premix combustor have a great difference, and its material is generally pottery, corrosion resistant plate, carbon fiber board and iron-chromium-aluminum metal silk screen etc. It is characterized in that under less excess air coefficient, it is possible to burning very abundant; Simultaneously as the little air of burning, cause that flame temperature is higher than the temperature of partly-premixed burning about 300 DEG C. Higher flue-gas temperature and less exhaust gas volumn (excess air coefficient) substantially increase heat exchange efficiency, it is easy to producing condensed water, therefore full premix combustion mode is often used for condensing combustion system.
Set probability that condensed water occurs as P, then
P=f(Q,A,α).
Wherein Q is input load, and A is heat exchanger effective heat exchange area, and α is excess air coefficient.
Water heater for a normal operation, the value of A is fixing, and therefore above formula can be reduced to P=f (Q, α). Namely the probability that condensed water produces is determined with input load by the excess air coefficient of system: 1) during input load linear change within the specific limits, load is more little, relative heat exchange area is more big, heat exchange efficiency is more high, the probability producing condensed water is more high, to a combustion system determined, when excess air coefficient is constant, if input load is little of a certain value, condensed water necessarily occurs. 2) excess air coefficient and condensed water has direct relation. In general, dew point temperature Td is the important parameter weighed and whether can produce condensed water, necessarily leading to condensed water when flue-gas temperature is less than dew point temperature, flue gas dew point is then directly proportional to humidity of flue gas (ds), and humidity of flue gas is equal to the ratio of water vapour quality in flue gas with total flue gas mass, obviously, excess air coefficient is more big, and total flue gas mass is more big, and humidity of flue gas is more little, flue gas dew point temperature is then more low, and the probability producing condensed water is more low. Therefore, for on-condensing product, it is to avoid producing condensed water will start with from the two aspect.
To traditional partially premixed burning, combustion system is mostly made up of some independent burners, by controlling the start and stop of partial combustion burner, the adjustment between minimum and maximum load can be completed, as shown in Figure 1, characteristic pattern for existing partially premixed sectional combustion, in figure, abscissa I is for regulating current value, vertical coordinate Q is input load, one is had the system section of the being divided into 1(burner number n1=5 of 15 burners) and section 2(burner number n2=15), it is possible to it is greatly improved the adjustment ratio of system. And work as busy hour, all of burner operation, its excess air coefficient is typically about 2; During minimum load, only partial combustion burner work, another part burner is only by air, and now excess air coefficient is up to more than 10, and therefore the probability of this system generation condensed water is very little.
But for full premix combustion, in whole load range, its excess air coefficient is kept at about 1.5, too high then from flame, too low then flame-out or tempering, the probability that when this can make Smaller load, condensed water occurs is greatly increased. According to experimental result, the heat-exchange system to a sizing, only when excess air coefficient is more than 2, being likely to of occurring of condensed water just can be reduced. Therefore, how full premix combustion system is applied to on-condensing product, does not produce again the risk of condensed water, be one of the problem that the invention solves the problems that.
One section of Chinese Patent Application No. is 200310101740, denomination of invention is the gas burner of Multistage Control " can ", disclose a kind of can the gas burner of Multistage Control, this burner is made up of multiple independent cast burners, in each independent cast burner, gaseous mixture feedway is set again, Venturi tube (Venturi tube) and manifold are set again outside gaseous mixture feedway, control the supply of combustion gas and air respectively and mix. Although this invention can solve the problem that the problem of segmentation, but structure is complicated, bulky, requires higher to manufacture and assembly technology, and cost is also corresponding higher.
Another section of Chinese Patent Application No. is 201310135997, and denomination of invention is that " malleation injection type full premix combustion heating plant " also discloses that similar structure.
In sum, develop a kind of sectional, load range is big, be not likely to produce condensed water, compact, with low cost and safe and reliable premix combustion systems, being a significant job, designing outstanding gasoline combustion/air mixer is then one of them committed step.
Summary of the invention
It is an object of the invention to provide a kind of multi-cavity gas-air mixing arrangement, this mixing arrangement can reduce volume, and can combustion gas and air be sufficiently mixed, and is uniformly distributed on burning section; Also there is combustion and segmented function, heat exchanger does not produce when making Smaller load condensed water, extend system service life.
For reaching above-mentioned purpose, the present invention proposes a kind of multi-cavity gas-air mixing arrangement, including at least two hybrid chamber, each described hybrid chamber is respectively provided with the mixed gas outlet that air intake is connected with burner, each described hybrid chamber is built-in respectively is provided with gas pipeline, each described gas pipeline all offers combustion gas spout, intersecting towards with the air flow entered in described hybrid chamber of described combustion gas spout.
Multi-cavity gas-air mixing arrangement as above, wherein, the connection of gas pipeline in hybrid chamber described at least two, described in the gas pipeline that is connected include at least one and control switch pipeline. Multi-cavity gas-air mixing arrangement as above, wherein, the described gas pipeline being connected also includes at least one normally opened pipeline, described normally opened pipeline is connected with the fuel gas transportation pipeline of peripheral hardware, is provided with, described control, the combustion gas on-off valve that the described control switch pipeline of control opens and closes between switch pipeline and described normally opened pipeline.
Multi-cavity gas-air mixing arrangement as above, wherein, described combustion gas on-off valve is electromagnetic valve, and the seal member of described electromagnetic valve is mobile is plugged in described control between switch pipeline and described normally opened pipeline.
Multi-cavity gas-air mixing arrangement as above, wherein, described gas pipeline is vertically installed on the air flow path footpath of described hybrid chamber.
Multi-cavity gas-air mixing arrangement as above, wherein, described hybrid chamber is Venturi type, and described Venturi type hybrid chamber has the aditus laryngis section of gradually-reducing shape and the mixing section of flaring shape.
Multi-cavity gas-air mixing arrangement as above, wherein, described at least two hybrid chamber is arranged side by side, and is separated mutually by dividing plate between two adjacent described hybrid chambers, and described gas pipeline is disposed through in described hybrid chamber by the installing hole that described dividing plate is offered.
Multi-cavity gas-air mixing arrangement as above, wherein, is provided with air distributing structure on the top of described hybrid chamber.
Multi-cavity gas-air mixing arrangement as above, wherein, described air distributing structure is the flat board with loose structure.
Multi-cavity gas-air mixing arrangement as above, wherein, described at least two hybrid chamber includes the first hybrid chamber and the second hybrid chamber, it is provided with the first gas pipeline in described first hybrid chamber, described second gas pipeline it is provided with in described second hybrid chamber, described second gas pipeline connects with described first gas pipeline, described second gas pipeline and described first gas pipeline all there is described gas injection mouth, and described combustion gas on-off valve is set between described second gas pipeline and described first gas pipeline.
Multi-cavity gas-air mixing arrangement as above, wherein, the ratio of the gas injection open area sum on described first gas pipeline and the gas injection open area sum on described second gas pipeline is between 1:3～1:1.
Compared with prior art, the invention have the characteristics that and advantage:
1, the present invention by multiple hybrid chambers by effective for gas air mixer segmentation, it is achieved big load regulation rate, do not produce condensed water in each load section, improve system reliability and life-span.
2, the built-in blast tube of the present invention had both achieved the active control controlling switch channel fuel, reduces again the volume of blender, significantly reduces cost.
3, the intersecting towards with the air flow entered in hybrid chamber of combustion gas spout of the present invention, makes combustion gas and air be sufficiently mixed.
In sum, the present invention compares with prior art, solving conventional full premix combustion system can not the problem of segmentation, blast tube is adopted to be built in the structure of blender, the supply of above-mentioned control switch channel fuel is effectively controlled by combustion gas on-off valve, compact conformation, with low cost, safety is high, has prominent substantive distinguishing features and significant progressive.
Accompanying drawing explanation
Accompanying drawing described here only for illustrative purposes, and is not intended to limit scope disclosed by the invention by any way. It addition, the shape of each parts in figure and proportional sizes etc. are only schematic, it is adapted to assist in the understanding of the present invention, is not the shape and the proportional sizes that specifically limit each parts of the present invention. Those skilled in the art is under the teachings of the present invention, it is possible to select various possible shape and proportional sizes to implement the present invention as the case may be.
Fig. 1 is the characteristic pattern of existing partially premixed sectional combustion;
Fig. 2 is the perspective view of the embodiment one of multi-cavity gas-air mixing arrangement of the present invention;
Fig. 3 is the A-A section structure schematic diagram of Fig. 2;
Fig. 4 is the B-B section structure schematic diagram of Fig. 3;
Fig. 5 is the structural representation of the embodiment two of multi-cavity gas-air mixing arrangement of the present invention.
Description of reference numerals:
1-the first hybrid chamber; 11-the first air intake; 12-the first gas pipeline;
2-the second hybrid chamber; 21-the second air intake; 22-the second gas pipeline;
3-the 3rd hybrid chamber; 32-the 3rd gas pipeline;
4-combustion gas spout; 5-combustion gas on-off valve; 501-seal member; 51-the first electromagnetic valve; 52-the second electromagnetic valve;
6-dividing plate; 7-aditus laryngis section; 8-mixing section.
Detailed description of the invention
Description in conjunction with accompanying drawing and the specific embodiment of the invention, it is possible to clearly understand the details of the present invention. But, the detailed description of the invention of invention described herein, only for illustrative purpose, and can not be understood as by any way is limitation of the present invention. Under the teachings of the present invention, technical staff is it is contemplated that based on the arbitrarily possible deformation of the present invention, these are regarded as belonging to the scope of the present invention.
The present invention proposes a kind of multi-cavity gas-air mixing arrangement, including at least two hybrid chamber, each hybrid chamber is respectively provided with the mixed gas outlet that air intake is connected with burner, and each hybrid chamber is built-in respectively is provided with gas pipeline, reduces the overall volume of mixing arrangement. Each gas pipeline all offers combustion gas spout, intersecting towards with the air flow entered in hybrid chamber of combustion gas spout. So so that air and combustion gas are sufficiently mixed in hybrid chamber.
As shown in Figures 2 to 4, Fig. 2 is the perspective view of the embodiment one of multi-cavity gas-air mixing arrangement of the present invention; Fig. 3 is the A-A section structure schematic diagram of Fig. 2; Fig. 4 is the B-B section structure schematic diagram of Fig. 3. Multi-cavity gas-air mixing arrangement of the present invention includes: first hybrid chamber the 1, second hybrid chamber the 2, first air intake the 11, second air intake the 21, first gas pipeline the 12, second gas pipeline 22, combustion gas on-off valve 5, mixed gas outlet (not shown).First hybrid chamber 1 and the second hybrid chamber 2 are respectively provided with air intake 11,21 and mixed gas outlet, air intake 11,21 is connected with air, air is provided so that the air passage that outside air enters in hybrid chamber 1,2 and formed along the inner chamber of hybrid chamber by blower fan. mixed gas outlet is then connected with burner, to provide air mixture to hybrid chamber. as shown in Figure 2 and Figure 3, first hybrid chamber 1 is built-in with the first gas pipeline 12, one end of first gas pipeline 12 is connected with fuel gas transportation pipeline and gas control valve, the direction of arrow in Fig. 3 is combustion gas input direction, control to introduce the gas quantity of the first gas pipeline 12 by gas control valve, the other end of the first gas pipeline 12 is connected with the second gas pipeline 22 being built in the second hybrid chamber 2 so that combustion gas can be passed through the first gas pipeline 12 and be delivered to the second gas pipeline 22. at the first gas pipeline 12, second gas pipeline 22 all offers combustion gas spout 4, combustion gas is injected blender by the combustion gas spout 4 of the gas pipeline being placed in blender, combustion gas spout 4 towards with enter hybrid chamber 1, air flow in 2 intersects, make hybrid chamber 1, combustion gas stream in 2 intersects with air stream and mixes, combustion gas stream changes direction upon mixing and flows with air stream, which adds hybrid chamber 1, the length of the actual mixed path of combustion gas and air in 2, thus both having achieved being sufficiently mixed of combustion gas and air, decrease again the overall volume of device. certainly, the present invention can also arrange three side by side, four or more hybrid chambers, mixes as long as the combustion gas stream that ensure that in hybrid chamber 1,2 intersects with air stream.
Further, gas pipeline 12,22 is respectively perpendicular on the air flow path footpath being arranged at hybrid chamber 1,2, further such that being more fully mixed of combustion gas and air, and further reduce the overall volume of burner.
In the present embodiment, as shown in Figure 2 and Figure 3, the first gas pipeline 12 connects with the second gas pipeline 22, is provided with and controls the combustion gas on-off valve 5 that the second gas pipeline 22 opens and closes between the second gas pipeline 22 and the first gas pipeline 12. First gas pipeline 12 is normally opened pipeline, and namely the first gas pipeline 12 maintains a normally open state, and the second gas pipeline 22 is for controlling switch pipeline, and namely the second gas pipeline 22 can control to open and close by combustion gas on-off valve 5, it is achieved that sectional combustion function. So, not only increase the load regulation rate of system, effectively reduce flue gas simultaneously and produce the probability of condensed water. In the present invention, difference according to hybrid chamber quantity, gas pipeline can also adapt to arrange three, four or more, each gas pipeline is sequentially communicated, the gas pipeline being connected includes at least one and controls switch pipeline and at least one normally opened pipeline, normally opened pipeline is connected with the fuel gas transportation pipeline of peripheral hardware, is provided with and controls the combustion gas on-off valve that switch pipeline opens and closes in the connecting tube controlling switch pipeline.
Further, as shown in Figure 2 and Figure 3, in the present embodiment, combustion gas on-off valve 5 is electromagnetic valve, the seal member 501 of electromagnetic valve is arranged between the first gas pipeline 12 and the second gas pipeline 22 by the outside of the second gas pipeline 22 is mobile, play the effect of closure the second gas pipeline 22 air inlet, it is achieved the closure function of the second gas pipeline 22. When the second gas pipeline 22 opened by needs, the side only seal member 501 need to moved to the second gas pipeline 22 so that the first gas pipeline 12 recovers to connect with the second gas pipeline 22.In the present invention, combustion gas on-off valve 5 can also adopt stop valve, ball valve, dish valve, plunger valve or other known switch valve, as long as being capable of controlling the keying function of switch pipeline, the invention is not limited in this regard.
Further, the ratio of the combustion gas spout 4 area sum on the first gas pipeline 12 and the combustion gas spout 4 area sum on the second gas pipeline 22 is between 1:3～1:1.
Further, as shown in Figure 2 and Figure 3, being separated by dividing plate 6 phase between first hybrid chamber 1 with the second hybrid chamber 2, the installing hole that the first gas pipeline 12 and the second gas pipeline 22 are offered by dividing plate 6 is disposed through in the first hybrid chamber 1 and the second hybrid chamber 2 so that structure is compacter.
Further, it is provided with air distributing structure on the top of the first hybrid chamber 1 and the second hybrid chamber 2 so that gaseous mixture is delivered to burner equably by air distributing structure. Preferably, air distributing structure is the flat board with loose structure.
Further, as shown in Figure 4, the first hybrid chamber 1 and the second hybrid chamber 2 are in Venturi type, and Venturi type hybrid chamber 1,2 has the aditus laryngis section 7 of gradually-reducing shape and the mixing section 8 of flaring shape. In the present embodiment, combustion gas spout 4 is positioned on front side of venturi aditus laryngis section 7, combustion gas occurs first time to mix with air in this region, the compression then passing through aditus laryngis section 7 is accelerated, in aditus laryngis section 7 downstream part expanding, and at the big radian turning of Venturi type hybrid chamber subsequently and deformation place of some runners, combustion gas and air are carried out premix, be sufficiently mixed before arriving burner, guaranteeing sufficient combustion, pollutant emission is low.
In another optional embodiment of the present invention, as it is shown in figure 5, be the structural representation of the embodiment two of multi-cavity gas-air mixing arrangement of the present invention. The present embodiment and embodiment one are different in that, hybrid chamber can be further divided into first hybrid chamber the 1, second hybrid chamber the 2, the 3rd hybrid chamber 3, also includes air intake, first gas pipeline the 12, second gas pipeline the 22, the 3rd gas pipeline the 32, first electromagnetic valve the 51, second electromagnetic valve 52, mixed gas outlet. Wherein, first gas pipeline is connected with the second gas pipeline the 22, the 3rd gas pipeline 32 respectively, junction arranges gas sealing platform, by the keying engaging and separating control the second gas pipeline the 22, the 3rd gas pipeline 32 of the seal member 501 of electromagnetic valve 51,52 with gas sealing platform. Designed by the said structure of the present embodiment, it is possible to mixing arrangement is divided into three sections, further increase burning load and regulate ratio, high-power system is more useful.
The multi-cavity gas-air mixing arrangement of the present invention can be manufactured by the mode of global formation, and material can be the plastics such as aluminum or PPS.
In sum, the present invention is by combustion gas jetting device and blender integration, gas air mixer is made to possess combustion and segmented function, make efficiency under big load higher, not only increase the load regulation rate of system, simultaneously because not producing condensed water under Smaller load, effectively reduce flue gas and produce the probability of condensed water; Meanwhile, blast tube is built in blender, and the mixing making combustion gas and air is more full and uniform, effectively reduce the discharge of burning pollutant, and blender size is optimized, it is achieved that reduce the purpose of system bulk, make holistic cost be greatly reduced, there is significant technological progress.
Explaining in detail for the respective embodiments described above, it makes an explanation only for purpose of to the present invention, so that better understood when the present invention, but, these describe can not be limitation of the present invention with any explanation one-tenth, particularly, each feature described in various embodiments can also combination in any mutually, thus forming other embodiments, except there being clearly contrary description, these features should be understood can be applied in any one embodiment, and is not limited merely to described embodiment.
Claims (10)
1. a multi-cavity gas-air mixing arrangement, including at least two hybrid chamber, each described hybrid chamber is respectively provided with the mixed gas outlet that air intake is connected with burner, it is characterized in that, each described hybrid chamber is built-in respectively is provided with gas pipeline, each described gas pipeline all offers combustion gas spout, intersecting towards with the air flow entered in described hybrid chamber of described combustion gas spout, gas pipeline connection in hybrid chamber described at least two, described in the gas pipeline that is connected include at least one and control switch pipeline.
2. multi-cavity gas-air mixing arrangement as claimed in claim 1, it is characterized in that, the described gas pipeline being connected also includes at least one normally opened pipeline, described normally opened pipeline is connected with the fuel gas transportation pipeline of peripheral hardware, is provided with, described control, the combustion gas on-off valve that the described control switch pipeline of control opens and closes between switch pipeline and described normally opened pipeline.
3. multi-cavity gas-air mixing arrangement as claimed in claim 2, it is characterised in that described combustion gas on-off valve is electromagnetic valve, the seal member of described electromagnetic valve is mobile is plugged in described control between switch pipeline and described normally opened pipeline.
4. multi-cavity gas-air mixing arrangement as claimed in claim 1, it is characterised in that described gas pipeline is vertically installed on the air flow path footpath of described hybrid chamber.
5. multi-cavity gas-air mixing arrangement as claimed in claim 1, it is characterised in that described hybrid chamber is Venturi type, and described Venturi type hybrid chamber has the aditus laryngis section of gradually-reducing shape and the mixing section of flaring shape.
6. multi-cavity gas-air mixing arrangement as claimed in claim 1, it is characterized in that, described at least two hybrid chamber is arranged side by side, and is separated mutually by dividing plate between two adjacent described hybrid chambers, and described gas pipeline is disposed through in described hybrid chamber by the installing hole that described dividing plate is offered.
7. multi-cavity gas-air mixing arrangement as claimed in claim 1, it is characterised in that be provided with air distributing structure on the top of described hybrid chamber.
8. multi-cavity gas-air mixing arrangement as claimed in claim 7, it is characterised in that described air distributing structure is the flat board with loose structure.
9. the multi-cavity gas-air mixing arrangement as according to any one of claim 1 to 8, it is characterized in that, described at least two hybrid chamber includes the first hybrid chamber and the second hybrid chamber, it is provided with the first gas pipeline in described first hybrid chamber, it is provided with the second gas pipeline in described second hybrid chamber, described second gas pipeline connects with described first gas pipeline, described second gas pipeline and described first gas pipeline all there is described gas injection mouth, and described combustion gas on-off valve is set between described second gas pipeline and described first gas pipeline.
10. multi-cavity gas-air mixing arrangement as claimed in claim 9, it is characterised in that the ratio of the gas injection open area sum on described first gas pipeline and the gas injection open area sum on described second gas pipeline is between 1:3～1:1.
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| CN201410009996.2A CN103742915B (en) | 2014-01-09 | 2014-01-09 | A kind of multi-cavity gas-air mixing arrangement |
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| CN103994581B (en) * | 2014-05-04 | 2017-01-18 | 广东万和新电气股份有限公司 | Fully-premixed combustion water heater with gas inlet device |
| ITUB20152343A1 (en) * | 2015-07-21 | 2017-01-21 | Polidoro Spa | HIGH GAS MODULATION GAS BOILER |
| JP6727710B2 (en) * | 2016-06-29 | 2020-07-22 | リンナイ株式会社 | Gas burner equipment |
| CN109724079A (en) * | 2019-01-15 | 2019-05-07 | 和烁（张家港）热能设备有限公司 | A kind of low NO system |
| CN112128985A (en) * | 2019-06-25 | 2020-12-25 | 芜湖美的厨卫电器制造有限公司 | Gas water heater's gas adjusting device and gas water heater that has it |
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| CN2722046Y (en) * | 2004-08-16 | 2005-08-31 | 上海城市燃气技术研究所 | Pre-mixed ultrastrong burner with double channels and two stages |
| CN203628660U (en) * | 2014-01-09 | 2014-06-04 | 艾欧史密斯(中国)热水器有限公司 | Multi-cavity gas-air mixing device |
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| JP3136201B2 (en) * | 1992-07-04 | 2001-02-19 | 株式会社ガスター | Premixing device |
| JPH0875127A (en) * | 1994-09-07 | 1996-03-19 | Matsushita Electric Ind Co Ltd | Combustion device |
| JP3686486B2 (en) * | 1996-09-12 | 2005-08-24 | 東京瓦斯株式会社 | Original mixed gas combustion equipment |
| JPH10227413A (en) * | 1997-02-17 | 1998-08-25 | Rinnai Corp | Combustion apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2722046Y (en) * | 2004-08-16 | 2005-08-31 | 上海城市燃气技术研究所 | Pre-mixed ultrastrong burner with double channels and two stages |
| CN203628660U (en) * | 2014-01-09 | 2014-06-04 | 艾欧史密斯(中国)热水器有限公司 | Multi-cavity gas-air mixing device |
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