EP3361155A1 - Gas mixer - Google Patents
Gas mixer Download PDFInfo
- Publication number
- EP3361155A1 EP3361155A1 EP17211079.3A EP17211079A EP3361155A1 EP 3361155 A1 EP3361155 A1 EP 3361155A1 EP 17211079 A EP17211079 A EP 17211079A EP 3361155 A1 EP3361155 A1 EP 3361155A1
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- EP
- European Patent Office
- Prior art keywords
- gas
- air
- axial direction
- gas mixer
- inlet
- Prior art date
- 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.)
- Granted
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- 238000005192 partition Methods 0.000 claims description 17
- 230000007423 decrease Effects 0.000 claims description 2
- 239000000446 fuel Substances 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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
Definitions
- the present invention relates to a burner for a gas apparatus, and more particularly to a gas mixer, which is adapted to mix gas and air.
- a conventional atmospheric gas burner is provided with a nozzle at the inlet of the burner.
- gas is outputted from the nozzle, a low pressure is created around the nozzle, drawing primary air into the burner to be mixed with gas. Igniting the mixed gas outputted from the flame holes of the burner can create flames. While the flames are burning, secondary air is further drawn around the flames for combustion.
- gas burner called fully premixed type, which uses a blower to draw air into the burner for the mixture, and the mixed air and gas are outputted from flame holes of the burner.
- a fully premixed gas burner mixes air and gas with a mixing pipe, which utilizes the principle of Venturi tube to mix airflow and gas flow in the pipe.
- a mixing pipe which utilizes the principle of Venturi tube to mix airflow and gas flow in the pipe.
- the primary objective of the present invention is to provide a gas mixer, which could evenly mix air and gas.
- the present invention provides a gas mixer, which is adapted to communicate with at least one burner, wherein the gas mixer includes a base and at least one outlet pipe.
- the base has an inlet portion and a mixing portion, wherein the inlet portion has an air inlet, at least one gas inlet, and an air path.
- the air path communicates with the air inlet and the at least one gas inlet, and has an exit.
- the mixing portion has a mixing chamber communicating with the exit.
- the at least one outlet pipe is engaged with the mixing portion of the base, wherein the outlet pipe has a first end, a second end, and a body located between the first end and the second end. Part of the body and the first end extend into the mixing chamber, and the exit of the air path corresponds to the body.
- the second end is adapted to communicate with the burner.
- a gas burning device 100 which has a gas mixer 16 of a first embodiment of the present invention is illustrated in FIG. 1 to FIG. 10 , wherein the gas burning device 100 is applied to a water heater as an example.
- the gas burning device 100 includes at least one burner 10, a gas inlet assembly 12, a blower 14, and the gas mixer 16 of the first embodiment.
- the at least one burner 10 includes a plurality of burners 10 arranged in a predetermined axial direction X, wherein each of the burners 10 is adapted to burn gas to create flames.
- the gas inlet assembly 12 includes a connecting pipe 122, an electromagnetic valve 124, a proportional valve 126, and at least one nozzle 128, wherein the connecting pipe 122 is adapted to be connected to a gas source (not shown).
- the electromagnetic valve 124 is controllable to open or block a gas path.
- the proportional valve 126 is adapted to regulate a gas flow passing through the gas path.
- the at least one nozzle 128 includes a plurality of nozzles 128 arranged in the predetermined axial direction X, wherein the nozzles 128 are adapted to output gas.
- the blower 14 is adapted to draw in air and then send out the air through an outlet 142 thereof.
- the gas mixer 16 includes a base 18, a flow splitter 42, at least one outlet pipe 46, and at least one partition 48.
- the base 18 is substantially long in shape and is composed of a plurality of plates.
- the base 18 has an inlet portion 20 and a mixing portion 26. More specifically, as shown in FIG. 4 , said plates include a top plate 30, a bottom plate 32, a front plate 34, a rear plate 36, a supporting plate 38, and two side plates 40, wherein the bottom plate 32, the front plate 34, the supporting plate 38, the side plates 40 constitute the inlet portion 20.
- the bottom plate 32 has an air inlet 322.
- the air inlet 322 is located in the middle of the bottom plate 32 in the predetermined axial direction X, wherein the air inlet 322 has at least one guiding surface 324.
- the at least one guiding surface 324 includes two guiding surfaces 324 located on opposite sides of the air inlet 322 in the predetermined axial direction X.
- Each of the guiding surfaces 324 faces upward, and is inclined in a way that, in a direction away from the air inlet 322, a distance between the guiding surfaces 324 in the predetermined axial direction X gradually increases.
- the blower 14 is engaged with the bottom plate 32, and the outlet 142 of the blower 14 communicates with the air inlet 322.
- an air chamber 22 and an air path 24 are formed between the front plate 34, the bottom plate 32, and the supporting plate 38, wherein the air chamber 22 is located between the air inlet 322 and the air path 24, and communicates with the air inlet 322.
- Two ends of the air path 24 are respectively an opening 242a and an exit 244a.
- the opening 242a and the exit 244a are both long in shape.
- An axial direction of the opening 242a and an axial direction of the exit 244a are both parallel to the predetermined axial direction X.
- the opening 242a communicates with the air chamber 22.
- the air path 24 has a first section 242 and a second section 244 communicating with the first section 242, wherein the first section 242 has the opening 242a, and the second section 244 has the exit 244a.
- the first section 242 has a defined first reference axis I1 extending from the opening 242a toward the second section 244, and the second section 244 has a defined second reference axis I2 extending from the first section 242 toward the exit 244a.
- An angle ⁇ between the first reference axis I1 and the second reference axis I2 is greater than 90 degrees, and is less than 180 degrees.
- the front plate 34 has an inclined surface 342 near a bottom thereof, and the supporting plate 38 has an inclined surface 382 near a bottom thereof as well, wherein the inclined surfaces 342, 382 form two opposite walls of the air chamber 22.
- the opening 242a is formed at a top margin of the inclined surfaces 342, 382.
- a distance between the inclined surfaces 342, 382 gradually decreases from the air inlet 322 to the opening 242a.
- the front plate 34 has at least one groove 344.
- the at least one groove 344 includes a plurality of grooves 344 arranged at regular intervals in the predetermined axial direction X.
- the supporting plate 38 has at least one engaging bore 384, which is adapted to be engaged with the at least one nozzle 128, and forms at least one gas inlet 386 on the inclined surface 382.
- the engaging bore 384 includes a plurality of engaging bores 384
- the gas inlet 386 includes a plurality of gas inlets 386, wherein the engaging bores 384 and the gas inlets 386 are arranged in the predetermined axial direction X, respectively.
- the top plate 30, the rear plate 36, the side plates 40, the supporting plate 38, and a top of the front plate 34 constitute the mixing portion 26, which forms a mixing chamber 28 communicating with the exit 244a of the air path 24.
- the exit 244a of the air path 24 extends to the upper half of the mixing chamber 28 through a guiding plate 38a provided on the supporting plate 38.
- a cross-section of the mixing chamber 28 in a direction parallel to the first reference axis I1 is a polygon, wherein a geometric center G is defined on the polygon.
- the top plate 30 is adapted to have the at least one outlet pipe 46 provided therethrough.
- the rear plate 36 has at least one groove 362.
- the groove 362 includes a plurality of grooves 362 corresponding to the grooves 344 of the front plate 34.
- the flow splitter 42 is provided in the air chamber 22 of the inlet portion 20 of the base 18, and is located between the gas inlets 386 and the air inlet 322.
- the flow splitter 42 divides the air chamber 22 into a first space 222 and a second space 224, wherein the first space 222 communicates with the air inlet 322, and the guiding surface 324 of the bottom plate 32 corresponds to the first space 222.
- the second space 224 communicates with the opening 242a and the gas inlets 386. As shown in FIG.
- the flow splitter 42 is long in shape, and includes a closed end which is a flat plate 422 as an example, two vertical plates 424, 424', two middle plates 426, and two inclined plates 428, wherein the flat plate 422 faces the opening 242a.
- the vertical plates 424, 424' are respectively connected to two opposite lateral edges of the flat plate 422, and faces the inclined surface 342 of the front plate 34 and the inclined surface 382 of the supporting plate 38, respectively.
- the vertical plate 424 has at least one through hole 424a facing the inclined surface 382 of the supporting plate 38.
- the at least one through hole 424a includes a plurality of through holes 424a arranged in the predetermined axial direction X.
- the another vertical plate 424' has a plurality of through holes 424a' arranged in the predetermined axial direction X, wherein the through holes 424a' face the inclined surface 342 of the front plate 34 (i.e., the wall opposite to the gas inlets 386).
- the first space 222 communicates with the second space 224 through the through holes 424a, 424a'.
- Each of the middle plates 426 is located between a side of one of the vertical plates 424, 424' and the corresponding one of the inclined surfaces 342, 382.
- Each of the inclined plates 428 is respectively connected to a side of one of the middle plates 426, and respectively abuts against the corresponding one of the inclined surfaces 342, 382.
- a sum of cross-sectional areas of the through holes 424a, 424a' is preferably greater than or equal to a cross-sectional area of the air inlet 322, whereby to reduce a reverse pressure generated when the blower 14 outputs the airflow.
- each of the middle plates 426 has a plurality of splitting holes 426a arranged in the predetermined axial direction X.
- a plurality of closing members 44 are detachably provided on the middle plates 426, wherein the closing members 44 are adapted to be optionally used to close at least a part of the splitting holes 426a.
- the closing members 44 could be made of a metal sheet such as foil tape.
- the airflow flowing from the first space 222 into the second space 224 passes mainly through the through holes 424a, 424a', and the splitting holes 426a are adapted to regulate the airflow. For areas with stronger airflow, the splitting holes 426a thereof could be sealed by the closing members 44.
- the splitting holes 426a on the middle plates 426 could be also omitted.
- the at least one outlet pipe 46 is provided in the mixing portion 26 of the base 18. More specifically, the at least one outlet pipe 46 passes through the top plate 30, and the at least one outlet pipe 46 includes a plurality of outlet pipes 46 arranged in the predetermined axial direction X. An axial direction of each of the outlet pipes 46 is parallel to the first reference axis I1 of the first section 242 of the air path 24.
- Each of the outlet pipes 46 has a first end 462, a second end 464, and a body 466 located between the first end 462 and the second end 464, wherein the first end 462 and part of the body 466 extend into the mixing chamber 28, and the first end 462 is near a center of the mixing chamber 28.
- the first end 462 is located at a height between 1/4 to 3/4 a longitudinal length of the mixing chamber 28.
- the second end 464 communicates with the burners 10, and the exit 244a of the air path 24 corresponds to the body 466.
- the cross-section of the mixing chamber 28 in the direction parallel to the first reference axis I1, i.e., parallel to the axial direction of each of the outlet pipes 46 is a polygon, which has the geometric center G defined therein.
- Said polygon is an octagon in the current embodiment. However, it is not limited to be an octagon as exemplified above, but could be a triangle or even a circle.
- each of the outlet pipes 46 is near the geometric center G of the polygon and is located between the exit 244a of the air path 24 and the geometric center G.
- the mixing chamber 28 communicates with the burners 10 through the outlet pipes 46.
- the ratio of the sum of a minimum cross-sectional area of each of the outlet pipes 46 to the minimum cross-sectional area of the air path 24 is between 1.2 and 0.8.
- the at least one partition 48 is provided on the base.
- the at least one partition 48 includes a plurality of partitions 48 arranged in the predetermined axial direction X.
- Each of the partitions 48 includes a first portion 482 located in the second space 224, a second portion 484 located in the air path 24, and a third portion 486 located in the mixing chamber 28, wherein each of the partitions 48 fits into one of the groove 362 of the rear plate 36 and one of the groove 344 of the front plate 34 in a way that the partitions 48 have regular intervals.
- the first portions 482 of the partitions 48 divide the second space 224 into a plurality of sub-spaces 224a
- the second portions 484 of the partitions 48 divide the air path 24 into a plurality of air sub-paths 24a
- the third portions 486 of the partitions 48 divide the mixing chamber 28 into a plurality of mixing sub-chambers 28a.
- Each of the mixing sub-chambers 28a has at least one of the outlet pipes 46 provided therein.
- Each of the sub-spaces 224a communicates with at least one of the through holes 424a and at least one of the gas inlets 386.
- FIG. 9 how the gas mixer 16 of the present embodiment mixes gas and air is illustrated in FIG. 9 and FIG. 10 .
- FIG. 9 when the air outputted by the outlet 142 of the blower 14 is injected into the first space 222 of the air chamber 22 through the air inlet 322, part of the airflow goes upward, and another part of the airflow flows to two sides of the air inlet 322 along the two guiding surfaces 324. Whereby, the airflow would enter the region in the first space 222 on two sides of the air inlet 322, rather than just concentrate above of the air inlet 322.
- the airflow flows into the second space 224 through the through holes 424a, 424a' of the flow splitter 42, wherein the flow splitter 42 could prevent the airflow from forming a vortex which may hinder the traveling of the airflow.
- the splitting holes 426a are not sealed, part of the airflow would flow into the second space through the splitting holes 426a. Since the second space 224 is divided into a plurality of sub-spaces 224a, the airflow in the sub-spaces 224a would not interfere with each other, so that the airflow could flow smoothly.
- the airflow in the sub-spaces 224a would be guided by the two inclined surfaces 342, 382 to flow upward along the inclined surfaces 342, 382, which could reduce the occurrence of turbulence.
- the airflow passes through the gas inlet 386, the gas flow would be drawn upward as well, wherein the airflow and the gas flow would enter the opening 242a together. After that, the airflow and the gas flow would pass through the air sub-paths 24a, and get into the mixing sub-chambers 28a through the exit 244a.
- the airflow and the gas flow would rotate along the wall of the mixing sub-chambers 28a, and move toward the geometrical center G of the polygon gradually. In this way, the airflow and the gas flow could be fully mixed in the mixing sub-chambers 28a.
- the flow rate of the airflow closer to the outermost periphery is high and the pressure there is low; on the contrary, the flow rate closer to the geometric center G is lower and the pressure there is high, which would facilitate the mixture.
- the mixed airflow and the gas flow with high pressure could easily enter the outlet pipes 46 through the first ends 462, and then be outputted into the burners 10 through the second ends 464 for combustion.
- the ratio of the sum of the minimum cross-sectional areas of the outlet pipes 46 to the minimum cross-sectional areas of the air path 24 is between 1.1 and 0.9.
- the pressure in the air path 24 would be close to the pressure in the outlet pipes 46, and therefore, when the amount of the airflow outputted from the blower 14 and the amount of gas injected through the gas inlet 386 are varied, the amount of air and the amount of gas coming out from the outlet pipes 46 would vary accordingly and rapidly, which would shorten the reaction time for adjusting the flame height of the burners 10.
- a gas mixer 16' of a second embodiment of the present invention has almost the same structure as said gas mixer 16 of the first embodiment, except that a base 18 in the second embodiment has no partition 48 provided therein.
- the partition 48 is omitted in the current embodiment, the airflow and the gas flow could still be fully mixed through the mixing chamber 28 and the two inclined surfaces of the air chamber 22 (only one of the inclined surfaces, i.e., the inclined surface 382, is shown in FIG. 11 ; the other one is not shown).
- a gas mixer 16" of a third embodiment of the present invention has almost the same structure as said gas mixer 16 of the first embodiment, except that an air inlet 322' on a bottom plate 32' of a base 18' is located on a side of a center of the bottom plate 32' in the predetermined axial direction X.
- a guiding surface 324' of the bottom plate 32' faces upward, and is also inclined in such a way mentioned in the first embodiment, wherein, in a direction away from the air inlet 322', a distance between the guiding surfaces 324' in the predetermined axial direction X gradually increases.
- the gas mixer of the present invention could effectively premix air and gas, whereby to enhance the combustion efficiency of the burner and shorten the reaction time for adjusting the flame height of the burner.
Abstract
Description
- The present invention relates to a burner for a gas apparatus, and more particularly to a gas mixer, which is adapted to mix gas and air.
- A conventional atmospheric gas burner is provided with a nozzle at the inlet of the burner. When gas is outputted from the nozzle, a low pressure is created around the nozzle, drawing primary air into the burner to be mixed with gas. Igniting the mixed gas outputted from the flame holes of the burner can create flames. While the flames are burning, secondary air is further drawn around the flames for combustion. There is another type of gas burner called fully premixed type, which uses a blower to draw air into the burner for the mixture, and the mixed air and gas are outputted from flame holes of the burner.
- A fully premixed gas burner mixes air and gas with a mixing pipe, which utilizes the principle of Venturi tube to mix airflow and gas flow in the pipe. Although the combustion efficiency of a fully premixed gas burner is higher than that of an atmospheric gas burner, the mixing effect of the mixing pipe is difficult to control. In addition, the length of the mixing pipe is usually short, and airflow and gas flow cannot be evenly mixed within such a limited traveling distance, hindering the combustion efficiency of the burner from being further improved.
- In view of the above, the primary objective of the present invention is to provide a gas mixer, which could evenly mix air and gas.
- To achieve the objective of the present invention, the present invention provides a gas mixer, which is adapted to communicate with at least one burner, wherein the gas mixer includes a base and at least one outlet pipe. The base has an inlet portion and a mixing portion, wherein the inlet portion has an air inlet, at least one gas inlet, and an air path. The air path communicates with the air inlet and the at least one gas inlet, and has an exit. The mixing portion has a mixing chamber communicating with the exit. The at least one outlet pipe is engaged with the mixing portion of the base, wherein the outlet pipe has a first end, a second end, and a body located between the first end and the second end. Part of the body and the first end extend into the mixing chamber, and the exit of the air path corresponds to the body. The second end is adapted to communicate with the burner.
- With the aforementioned design, gas and air could be mixed more evenly, enhancing the combustion efficiency of the burner.
- The present invention will be best understood by referring to the following detailed description of some illustrative embodiments in conjunction with the accompanying drawings, in which
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FIG. 1 is a perspective view of the gas burning device of a first embodiment of the present invention; -
FIG. 2 is an exploded view of the gas burning device of the first embodiment; -
FIG. 3 is an exploded view of the gas burning device of the first embodiment seen from another perspective; -
FIG. 4 is an exploded view, showing the gas mixer of the first embodiment; -
FIG. 5 is a sectional view along the 5-5 line inFIG.1 ; -
FIG. 6 is a partial enlarged view ofFIG. 5 ; -
FIG. 7 is a partial perspective view, showing the flow splitter of the first embodiment; -
FIG. 8 is a side view, showing the partition of the first embodiment; -
FIG. 9 is a sectional schematic diagram, showing the airflow flowing in the gas mixer; -
FIG. 10 is another sectional schematic diagram, showing the airflow flowing in the gas mixer; -
FIG. 11 is a sectional schematic diagram of the gas mixer of a second embodiment of the present invention; and -
FIG. 12 is a sectional schematic diagram of the gas mixer of a third embodiment of the present invention. - A
gas burning device 100 which has agas mixer 16 of a first embodiment of the present invention is illustrated inFIG. 1 to FIG. 10 , wherein thegas burning device 100 is applied to a water heater as an example. Thegas burning device 100 includes at least oneburner 10, agas inlet assembly 12, ablower 14, and thegas mixer 16 of the first embodiment. - The at least one
burner 10 includes a plurality ofburners 10 arranged in a predetermined axial direction X, wherein each of theburners 10 is adapted to burn gas to create flames. Thegas inlet assembly 12 includes a connectingpipe 122, anelectromagnetic valve 124, aproportional valve 126, and at least onenozzle 128, wherein the connectingpipe 122 is adapted to be connected to a gas source (not shown). Theelectromagnetic valve 124 is controllable to open or block a gas path. Theproportional valve 126 is adapted to regulate a gas flow passing through the gas path. The at least onenozzle 128 includes a plurality ofnozzles 128 arranged in the predetermined axial direction X, wherein thenozzles 128 are adapted to output gas. Theblower 14 is adapted to draw in air and then send out the air through anoutlet 142 thereof. - The
gas mixer 16 includes abase 18, aflow splitter 42, at least oneoutlet pipe 46, and at least onepartition 48. - The
base 18 is substantially long in shape and is composed of a plurality of plates. Thebase 18 has aninlet portion 20 and amixing portion 26. More specifically, as shown inFIG. 4 , said plates include atop plate 30, abottom plate 32, afront plate 34, arear plate 36, a supportingplate 38, and twoside plates 40, wherein thebottom plate 32, thefront plate 34, the supportingplate 38, theside plates 40 constitute theinlet portion 20. Thebottom plate 32 has anair inlet 322. In the current embodiment, theair inlet 322 is located in the middle of thebottom plate 32 in the predetermined axial direction X, wherein theair inlet 322 has at least one guidingsurface 324. In the current embodiment, the at least one guidingsurface 324 includes two guidingsurfaces 324 located on opposite sides of theair inlet 322 in the predetermined axial direction X. Each of the guidingsurfaces 324 faces upward, and is inclined in a way that, in a direction away from theair inlet 322, a distance between theguiding surfaces 324 in the predetermined axial direction X gradually increases. Theblower 14 is engaged with thebottom plate 32, and theoutlet 142 of theblower 14 communicates with theair inlet 322. - As shown in
FIG. 4 to FIG. 6 , anair chamber 22 and anair path 24 are formed between thefront plate 34, thebottom plate 32, and the supportingplate 38, wherein theair chamber 22 is located between theair inlet 322 and theair path 24, and communicates with theair inlet 322. Two ends of theair path 24 are respectively an opening 242a and anexit 244a. The opening 242a and theexit 244a are both long in shape. An axial direction of the opening 242a and an axial direction of theexit 244a are both parallel to the predetermined axial direction X. The opening 242a communicates with theair chamber 22. In the current embodiment, theair path 24 has afirst section 242 and asecond section 244 communicating with thefirst section 242, wherein thefirst section 242 has the opening 242a, and thesecond section 244 has theexit 244a. Thefirst section 242 has a defined first reference axis I1 extending from the opening 242a toward thesecond section 244, and thesecond section 244 has a defined second reference axis I2 extending from thefirst section 242 toward theexit 244a. An angle θ between the first reference axis I1 and the second reference axis I2 is greater than 90 degrees, and is less than 180 degrees. - The
front plate 34 has aninclined surface 342 near a bottom thereof, and the supportingplate 38 has aninclined surface 382 near a bottom thereof as well, wherein theinclined surfaces air chamber 22. The opening 242a is formed at a top margin of theinclined surfaces inclined surfaces air inlet 322 to theopening 242a. Thefront plate 34 has at least onegroove 344. In the current embodiment, the at least onegroove 344 includes a plurality ofgrooves 344 arranged at regular intervals in the predetermined axial direction X. - The supporting
plate 38 has at least oneengaging bore 384, which is adapted to be engaged with the at least onenozzle 128, and forms at least onegas inlet 386 on theinclined surface 382. In the current embodiment, the engagingbore 384 includes a plurality of engagingbores 384, and thegas inlet 386 includes a plurality ofgas inlets 386, wherein the engagingbores 384 and thegas inlets 386 are arranged in the predetermined axial direction X, respectively. - The
top plate 30, therear plate 36, theside plates 40, the supportingplate 38, and a top of thefront plate 34 constitute the mixingportion 26, which forms a mixingchamber 28 communicating with theexit 244a of theair path 24. In the current embodiment, theexit 244a of theair path 24 extends to the upper half of the mixingchamber 28 through a guidingplate 38a provided on the supportingplate 38. As shown inFIG. 5 andFIG. 6 , a cross-section of the mixingchamber 28 in a direction parallel to the first reference axis I1 is a polygon, wherein a geometric center G is defined on the polygon. Thetop plate 30 is adapted to have the at least oneoutlet pipe 46 provided therethrough. Therear plate 36 has at least onegroove 362. In the current embodiment, thegroove 362 includes a plurality ofgrooves 362 corresponding to thegrooves 344 of thefront plate 34. - The
flow splitter 42 is provided in theair chamber 22 of theinlet portion 20 of thebase 18, and is located between thegas inlets 386 and theair inlet 322. Theflow splitter 42 divides theair chamber 22 into afirst space 222 and asecond space 224, wherein thefirst space 222 communicates with theair inlet 322, and the guidingsurface 324 of thebottom plate 32 corresponds to thefirst space 222. Thesecond space 224 communicates with theopening 242a and thegas inlets 386. As shown inFIG. 7 , in the current embodiment, theflow splitter 42 is long in shape, and includes a closed end which is aflat plate 422 as an example, twovertical plates 424, 424', twomiddle plates 426, and twoinclined plates 428, wherein theflat plate 422 faces theopening 242a. Thevertical plates 424, 424' are respectively connected to two opposite lateral edges of theflat plate 422, and faces theinclined surface 342 of thefront plate 34 and theinclined surface 382 of the supportingplate 38, respectively. Thevertical plate 424 has at least one throughhole 424a facing theinclined surface 382 of the supportingplate 38. In the current embodiment, the at least one throughhole 424a includes a plurality of throughholes 424a arranged in the predetermined axial direction X. The another vertical plate 424' has a plurality of throughholes 424a' arranged in the predetermined axial direction X, wherein the throughholes 424a' face theinclined surface 342 of the front plate 34 (i.e., the wall opposite to the gas inlets 386). Thefirst space 222 communicates with thesecond space 224 through the throughholes middle plates 426 is located between a side of one of thevertical plates 424, 424' and the corresponding one of theinclined surfaces inclined plates 428 is respectively connected to a side of one of themiddle plates 426, and respectively abuts against the corresponding one of theinclined surfaces holes air inlet 322, whereby to reduce a reverse pressure generated when theblower 14 outputs the airflow. - In the current embodiment, each of the
middle plates 426 has a plurality of splittingholes 426a arranged in the predetermined axial direction X. A plurality of closingmembers 44 are detachably provided on themiddle plates 426, wherein the closingmembers 44 are adapted to be optionally used to close at least a part of the splittingholes 426a. In practice, the closingmembers 44 could be made of a metal sheet such as foil tape. The airflow flowing from thefirst space 222 into thesecond space 224 passes mainly through the throughholes splitting holes 426a are adapted to regulate the airflow. For areas with stronger airflow, the splittingholes 426a thereof could be sealed by the closingmembers 44. In practice, the splittingholes 426a on themiddle plates 426 could be also omitted. - The at least one
outlet pipe 46 is provided in the mixingportion 26 of thebase 18. More specifically, the at least oneoutlet pipe 46 passes through thetop plate 30, and the at least oneoutlet pipe 46 includes a plurality ofoutlet pipes 46 arranged in the predetermined axial direction X. An axial direction of each of theoutlet pipes 46 is parallel to the first reference axis I1 of thefirst section 242 of theair path 24. Each of theoutlet pipes 46 has afirst end 462, asecond end 464, and abody 466 located between thefirst end 462 and thesecond end 464, wherein thefirst end 462 and part of thebody 466 extend into the mixingchamber 28, and thefirst end 462 is near a center of the mixingchamber 28. Preferably, thefirst end 462 is located at a height between 1/4 to 3/4 a longitudinal length of the mixingchamber 28. Thesecond end 464 communicates with theburners 10, and theexit 244a of theair path 24 corresponds to thebody 466. As mentioned above, the cross-section of the mixingchamber 28 in the direction parallel to the first reference axis I1, i.e., parallel to the axial direction of each of theoutlet pipes 46, is a polygon, which has the geometric center G defined therein. Said polygon is an octagon in the current embodiment. However, it is not limited to be an octagon as exemplified above, but could be a triangle or even a circle. Thefirst end 462 of each of theoutlet pipes 46 is near the geometric center G of the polygon and is located between theexit 244a of theair path 24 and the geometric center G. The mixingchamber 28 communicates with theburners 10 through theoutlet pipes 46. The ratio of the sum of a minimum cross-sectional area of each of theoutlet pipes 46 to the minimum cross-sectional area of theair path 24 is between 1.2 and 0.8. - As shown in
FIG. 4 to FIG. 6 , andFIG. 8 , the at least onepartition 48 is provided on the base. In the current embodiment, the at least onepartition 48 includes a plurality ofpartitions 48 arranged in the predetermined axial direction X. Each of thepartitions 48 includes afirst portion 482 located in thesecond space 224, asecond portion 484 located in theair path 24, and athird portion 486 located in the mixingchamber 28, wherein each of thepartitions 48 fits into one of thegroove 362 of therear plate 36 and one of thegroove 344 of thefront plate 34 in a way that thepartitions 48 have regular intervals. Thefirst portions 482 of thepartitions 48 divide thesecond space 224 into a plurality ofsub-spaces 224a, thesecond portions 484 of thepartitions 48 divide theair path 24 into a plurality ofair sub-paths 24a, and thethird portions 486 of thepartitions 48 divide the mixingchamber 28 into a plurality of mixing sub-chambers 28a. Each of the mixing sub-chambers 28a has at least one of theoutlet pipes 46 provided therein. Each of the sub-spaces 224a communicates with at least one of the throughholes 424a and at least one of thegas inlets 386. - How the
gas mixer 16 of the present embodiment mixes gas and air is illustrated inFIG. 9 andFIG. 10 . As shown inFIG. 9 , when the air outputted by theoutlet 142 of theblower 14 is injected into thefirst space 222 of theair chamber 22 through theair inlet 322, part of the airflow goes upward, and another part of the airflow flows to two sides of theair inlet 322 along the two guidingsurfaces 324. Whereby, the airflow would enter the region in thefirst space 222 on two sides of theair inlet 322, rather than just concentrate above of theair inlet 322. - As shown in
FIG. 10 , the airflow flows into thesecond space 224 through the throughholes flow splitter 42, wherein theflow splitter 42 could prevent the airflow from forming a vortex which may hinder the traveling of the airflow. In the case that the splittingholes 426a are not sealed, part of the airflow would flow into the second space through the splittingholes 426a. Since thesecond space 224 is divided into a plurality ofsub-spaces 224a, the airflow in thesub-spaces 224a would not interfere with each other, so that the airflow could flow smoothly. The airflow in thesub-spaces 224a would be guided by the twoinclined surfaces inclined surfaces gas inlet 386, the gas flow would be drawn upward as well, wherein the airflow and the gas flow would enter theopening 242a together. After that, the airflow and the gas flow would pass through theair sub-paths 24a, and get into the mixing sub-chambers 28a through theexit 244a. Since theexit 244a is located at the outermost periphery of the mixing sub-chambers 28a, the airflow and the gas flow would rotate along the wall of the mixing sub-chambers 28a, and move toward the geometrical center G of the polygon gradually. In this way, the airflow and the gas flow could be fully mixed in the mixing sub-chambers 28a. In the mixing sub-chambers 28a, the flow rate of the airflow closer to the outermost periphery is high and the pressure there is low; on the contrary, the flow rate closer to the geometric center G is lower and the pressure there is high, which would facilitate the mixture. Therefore, by providing the first ends 462 of theoutlet pipes 46 near the geometric center G (i.e., near the center of the mixing chamber 28), the mixed airflow and the gas flow with high pressure could easily enter theoutlet pipes 46 through the first ends 462, and then be outputted into theburners 10 through the second ends 464 for combustion. - In addition, the ratio of the sum of the minimum cross-sectional areas of the
outlet pipes 46 to the minimum cross-sectional areas of theair path 24 is between 1.1 and 0.9. In other words, the pressure in theair path 24 would be close to the pressure in theoutlet pipes 46, and therefore, when the amount of the airflow outputted from theblower 14 and the amount of gas injected through thegas inlet 386 are varied, the amount of air and the amount of gas coming out from theoutlet pipes 46 would vary accordingly and rapidly, which would shorten the reaction time for adjusting the flame height of theburners 10. - As illustrated in
FIG. 11 , a gas mixer 16' of a second embodiment of the present invention has almost the same structure as saidgas mixer 16 of the first embodiment, except that a base 18 in the second embodiment has nopartition 48 provided therein. Although thepartition 48 is omitted in the current embodiment, the airflow and the gas flow could still be fully mixed through the mixingchamber 28 and the two inclined surfaces of the air chamber 22 (only one of the inclined surfaces, i.e., theinclined surface 382, is shown inFIG. 11 ; the other one is not shown). - As illustrated in
FIG. 12 , agas mixer 16" of a third embodiment of the present invention has almost the same structure as saidgas mixer 16 of the first embodiment, except that an air inlet 322' on a bottom plate 32' of a base 18' is located on a side of a center of the bottom plate 32' in the predetermined axial direction X. A guiding surface 324' of the bottom plate 32' faces upward, and is also inclined in such a way mentioned in the first embodiment, wherein, in a direction away from the air inlet 322', a distance between the guiding surfaces 324' in the predetermined axial direction X gradually increases. - In conclusion, the gas mixer of the present invention could effectively premix air and gas, whereby to enhance the combustion efficiency of the burner and shorten the reaction time for adjusting the flame height of the burner.
Claims (15)
- A gas mixer (16, 16', 16"), which is adapted to communicate with at least one burner (10), comprising:a base (18, 18') having an inlet portion (20) and a mixing portion (26), wherein the inlet portion (20) has an air inlet (322, 322'), at least one gas inlet (386), and an air path (24); the air path (24) communicates with the air inlet (322, 322') and the at least one gas inlet (386), and has an exit (244a); the mixing portion (26) has a mixing chamber (28) communicating with the exit (244a); andat least one outlet pipe (46) engaged with the mixing portion (26) of the base (18, 18'), wherein the at least one outlet pipe (46) has a first end (462), a second end (464), and a body (466) located between the first end (462) and the second end (464); part of the body (466) and the first end (462) extend into the mixing chamber (28), and the exit (244a) of the air path (24) corresponds to the body (466); the second end (464) is adapted to communicate with the burner (10).
- The gas mixer of claim 1, wherein a cross-section of the mixing chamber (28) in a direction parallel to an axial direction of the at least one outlet pipe (46) is a polygon; the first end (462) of each of the at least one outlet pipe (46) is located close to a geometric center (G) defined in the polygon.
- The gas mixer of claim 2, wherein the first end (462) of each of the at least one outlet pipe (46) is located between the exit (244a) and the geometric center (G) of the polygon.
- The gas mixer of claim 1, wherein the first end (462) of each of the at least one outlet pipe (46) is located close to a center of the mixing chamber (28).
- The gas mixer of claim 1, wherein the at least one outlet pipe (46) comprises a plurality of outlet pipes (46) arranged in a predetermined axial direction (X); an axial direction of the exit (244a) is parallel to the predetermined axial direction (X).
- The gas mixer of claim 5, wherein the inlet portion (20) has an air chamber (22) communicating with the air inlet (322, 322'); the at least one gas inlet (386) is located on a wall of the air chamber (22); the air path (24) has a first section (242) and a second section (244) communicating with the first section (242); an end of the first section (242) has an opening (242a) communicating with the air chamber (22), and the second section (244) has the exit (244a); the first section (242) has a defined first reference axis (I1) extending from the opening (242a) toward the second section (244), and the second section (244) has a defined second reference axis (I2) extending from the first section (242) toward the exit (244a), wherein the first reference axis (I1) is parallel to the axial direction of each of the outlet pipes (46); an angle (θ) between the first reference axis (I1) and the second reference axis (I2) is greater than 90 degrees, and is less than 180 degrees.
- The gas mixer of claim 6, further comprising a flow splitter (42) provided in the air chamber (22), wherein the flow splitter (42) divides the air chamber (22) into a first space (222) and a second space (224); the first space (222) communicates with the air inlet (322, 322'), and the second space (224) communicates with the opening (242a); the flow splitter (42) has a plurality of through holes (424a, 424a') arranged in the predetermined axial direction (X), and the first space (222) communicates with the second space (224) through the through holes (424a, 424a'); the air chamber (22) has two opposite walls, which are inclined, and a distance therebetween gradually decreases in a direction from the air inlet (322, 322') to the opening (242a); the at least one gas inlet (386) comprises a plurality of gas inlets (386) arranged in the predetermined axial direction (X); the gas inlets (386) are located on one of the walls, and correspond to the second space (224); the through holes (424a) face one of the walls which has the gas inlets (386) provided thereon.
- The gas mixer of claim 7, wherein the flow splitter (42) further comprises a closed end and a vertical plate (424) connected to a lateral edge of the closed end; the closed end faces the opening (242a); the vertical plate (424) has the through holes (424a).
- The gas mixer of claim 8, wherein the flow splitter (42) comprises another vertical plate (424') connected to another lateral edge of the closed end; the another vertical plate (424') has a plurality of through holes (424a') arranged in the predetermined axial direction (X); the another vertical plate (424') faces one of the walls opposite to the gas inlets (386).
- The gas mixer of claim 9, further comprising a plurality of closing members (44) detachably engaged with the flow splitter (42), wherein the flow splitter (42) comprises two middle plates (426); each of the middle plates (426) is located between a side of one of the vertical plates (424, 424') and the corresponding one of the walls; each of the middle plates (426) has a plurality of splitting holes (426a) arranged in the predetermined axial direction (X); the closing members (44) optionally close at least a part of the splitting holes (426a).
- The gas mixer of claim 7, wherein the base (18, 18') comprises a bottom plate (32, 32') having the air inlet (322, 322') and at least one guiding surface (324, 324') corresponding to the first space (222); the at least one guiding surface (324, 324') faces upward, and is inclined from the air inlet (322, 322').
- The gas mixer of claim 11, wherein the at least one guiding surface (324) comprises two guiding surfaces (324) located on two opposite sides of the air inlet (322) in the predetermined axial direction (X).
- The gas mixer of claim 11, wherein the air inlet (322') is located on a side of a center of the bottom plate (32') in the predetermined axial direction (X).
- The gas mixer of claim 11, further comprising at least one partition (48) provided on the base (18, 18'); the at least one partition (48) comprises a first portion (482) located in the second space (224), a second portion (484) located in the air path (24), and a third portion (486) located in the mixing chamber (28), wherein the first portion (482) divides the second space (224) into a plurality of sub-spaces (224a); the second portion (484) divides the air path (24) into a plurality of air sub-paths (24a); the third portion (486) divides the mixing chamber (28) into a plurality of mixing sub-chambers (28a).
- The gas mixer of claim 14, wherein the at least one partition (48) comprises a plurality of partitions (48) arranged in the predetermined axial direction (X); each of the mixing sub-chambers (28a) has at least one of the outlet pipes (46) provided therein; each of the sub-spaces (224a) communicates with at least one of the through holes (424a, 424a') and at least one of the gas inlets (386).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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TW106104085A TWI643667B (en) | 2017-02-08 | 2017-02-08 | Gas mixer (2) |
Publications (2)
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EP3361155A1 true EP3361155A1 (en) | 2018-08-15 |
EP3361155B1 EP3361155B1 (en) | 2019-08-21 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP17211079.3A Active EP3361155B1 (en) | 2017-02-08 | 2017-12-29 | Gas mixer |
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EP (1) | EP3361155B1 (en) |
TW (1) | TWI643667B (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB191517089A (en) * | 1915-12-04 | 1916-11-30 | William Casbon | Improvements in Incandescent Gas Burners. |
JP2991481B2 (en) * | 1990-11-26 | 1999-12-20 | 株式会社東芝 | Combustion equipment |
US20050053887A1 (en) * | 2002-06-26 | 2005-03-10 | Per Westergaard | Burner fuel mixer head for concurrently burning two gaseous fuels |
CN202109481U (en) * | 2011-05-10 | 2012-01-11 | 程敏 | Wind-assistant efficient and energy-saving combustion apparatus |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW467256U (en) * | 2001-05-01 | 2001-12-01 | Fang Yuan Entpr Co Ltd | Burner |
TWM364828U (en) * | 2009-05-05 | 2009-09-11 | Lin-Gui Qiu | High performance energy saving gas combustor |
CN201964594U (en) * | 2011-04-12 | 2011-09-07 | 励土峰 | Gas water heater with mixing chamber |
TWM456458U (en) * | 2013-02-23 | 2013-07-01 | Grand Mate Co Ltd | Gas mixer |
-
2017
- 2017-02-08 TW TW106104085A patent/TWI643667B/en active
- 2017-12-29 EP EP17211079.3A patent/EP3361155B1/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB191517089A (en) * | 1915-12-04 | 1916-11-30 | William Casbon | Improvements in Incandescent Gas Burners. |
JP2991481B2 (en) * | 1990-11-26 | 1999-12-20 | 株式会社東芝 | Combustion equipment |
US20050053887A1 (en) * | 2002-06-26 | 2005-03-10 | Per Westergaard | Burner fuel mixer head for concurrently burning two gaseous fuels |
CN202109481U (en) * | 2011-05-10 | 2012-01-11 | 程敏 | Wind-assistant efficient and energy-saving combustion apparatus |
Also Published As
Publication number | Publication date |
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EP3361155B1 (en) | 2019-08-21 |
TWI643667B (en) | 2018-12-11 |
TW201829051A (en) | 2018-08-16 |
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