TWI643667B - Gas mixer (2) - Google Patents

Abstract

A gas mixer includes a main body and at least one air outlet tube, wherein the main body has an air inlet portion and a gas mixing portion, wherein the air inlet portion has an air inlet, at least one gas inlet and an air channel, and the air channel and The air inlet and the gas inlet are in communication, and the gas prop has an outlet; the air mixing section has a mixing chamber in communication with the outlet; the air outlet pipe is connected to the air mixing section of the main body, and the air outlet pipe protrudes into the mixing room And the outlet of the airway corresponds to the body of the airway. In this way, the gas stream and the air stream are fully premixed and output to the burner, which can accurately control the air-fuel ratio and improve the combustion efficiency of the burner.

Description

Gas mixer (2)

The invention relates to a gas combustion device; in particular, it relates to a gas mixer for mixing gas with air.

The traditional atmospheric gas combustion device is provided with a nozzle at the gas inlet of the burner. The low pressure formed around the nozzle when the gas is output from the nozzle is used to introduce primary air into the burner and mix it with the gas. After the gas is ignited, a flame is formed, and when the flame is burned, a secondary air is introduced from around the flame to burn. Another type of gas combustion device is a full premixed type, which uses a blower to introduce air into the burner to mix with the gas, and outputs the mixed gas and air from the burner's fire hole.

The fully premixed gas combustion device uses a gas mixing tube as a mixture of gas and an empty device. The gas mixing tube system uses the principle of a manifold tube to allow air flow and gas flow to be mixed in the tube body. Although the combustion efficiency of the full premixed gas combustion device is higher than that of the atmospheric gas combustion device, the mixing effect of the gas mixing tube is difficult to control, and the length of the gas mixing tube is usually not long. The air flow and gas flow cannot be mixed in the gas. Evenly mixed in a limited travel distance in the tube, its mixing efficiency is limited, resulting in that the combustion efficiency of the combustion device cannot be further improved.

In view of this, an object of the present invention is to provide a gas mixer, which can uniformly mix the air flow and the gas flow.

In order to achieve the above object, the present invention provides a gas mixer for communicating with at least one burner. The gas mixer includes a main body and at least one air outlet pipe, wherein the main body has an air inlet portion and a gas mixing portion. Wherein the air inlet has an air inlet, at least one gas inlet and an air channel, the air channel is in communication with the air inlet and the gas inlet, and the gas prop has an outlet; the air mixing portion has a mixing chamber in communication with the outlet; The at least one air outlet pipe is coupled to the air mixing part of the main body, the air outlet pipe has a first end, a second end, and a tube body located between the first end and the second end, wherein a part of the tube body The first end protrudes into the mixing chamber, and the outlet of the airway corresponds to the tube body; the second end is in communication with the burner.

The effect of the invention is to effectively pre-mix air and gas uniformly in a gas mixer, thereby increasing the combustion efficiency of the burner.

〔this invention〕

100‧‧‧gas combustion device

10‧‧‧ Burner

12‧‧‧gas inlet assembly

122‧‧‧ Takeover

124‧‧‧ Solenoid Valve

126‧‧‧ proportional valve

128‧‧‧ Nozzle

14‧‧‧ Blower

142‧‧‧outlet

16, 16 ’, 16” ‧‧‧ Gas Mixer

18, 18’‧‧‧ main body

20‧‧‧Air inlet

22‧‧‧Air chamber

222‧‧‧First Space

224‧‧‧Second Space

224a‧‧‧times space

24‧‧‧Airway

242‧‧‧ first paragraph

242a‧‧‧Vent

244‧‧‧paragraph 2

244a‧‧‧Exit

24a‧‧‧time airway

26‧‧‧Air mixing department

28‧‧‧ mixing room

28a‧‧‧time mixing room

30‧‧‧Top plate

32, 32’‧‧‧ floor

322, 322’‧‧‧ air inlet

324, 324’‧‧‧ guide surface

34‧‧‧Front cover

342‧‧‧ bevel

344‧‧‧Recess

36‧‧‧Rear cover

362‧‧‧ Recessed

38‧‧‧ support plate

38a‧‧‧ Guide

382‧‧‧ bevel

384‧‧‧Combination well

386‧‧‧Gas entrance

40‧‧‧side cover

42‧‧‧ Diverter

422‧‧‧ Flat

424‧‧‧Stand

424a‧‧‧through hole

424'‧‧‧ stand

424a'‧‧‧through hole

426‧‧‧Folding plate

426a‧‧‧Split hole

428‧‧‧inclined plate

44‧‧‧ Closure

46‧‧‧ Outlet

462‧‧‧ the first end

464‧‧‧Second End

466‧‧‧ tube body

48‧‧‧ bulkhead

482‧‧‧Part I

484‧‧‧Part II

486‧‧‧Part III

G‧‧‧ Geometry Center

X‧‧‧ scheduled axial

I1‧‧‧ first reference axis

I2‧‧‧ second reference axis

θ‧‧‧ angle

FIG. 1 is a perspective view of a gas combustion device according to a first preferred embodiment of the present invention.

FIG. 2 is an exploded view of the gas combustion device of the above preferred embodiment.

FIG. 3 is another exploded view of the gas combustion device of the above preferred embodiment.

FIG. 4 is an exploded view of the gas mixer of the above preferred embodiment.

FIG. 5 is a sectional view taken along 5-5 of FIG. 1.

FIG. 6 is a partially enlarged view of FIG. 5.

FIG. 7 is a partial perspective view of a diverter according to the above preferred embodiment.

FIG. 8 is a side view of the partition plate of the above preferred embodiment.

FIG. 9 is a schematic cross-sectional view illustrating the flow of airflow in a gas mixer.

FIG. 10 is a schematic cross-sectional view illustrating the flow of airflow in a gas mixer.

FIG. 11 is a schematic sectional view of a gas mixer according to a second preferred embodiment of the present invention.

FIG. 12 is a schematic sectional view of a gas mixer according to a third preferred embodiment of the present invention.

In order to explain the present invention more clearly, a preferred embodiment is described in detail below with reference to the drawings. Please refer to FIG. 1 to FIG. 10, which is a gas combustion device 100 having a gas mixer according to a first preferred embodiment of the present invention. The gas combustion device 100 is applied to a water heater as an example and includes at least one burner 10 , A gas inlet assembly 12, a blower 14, and the gas mixer 16 of this embodiment.

The number of the at least one burner 10 is plural and is arranged along a predetermined axis X. Each of the burners 10 is used to burn gas to generate a flame. The gas inlet assembly 12 includes a nozzle, a solenoid valve 124, a proportional valve 126, and at least one nozzle 128, wherein the nozzle 122 is connected to a gas source (not shown); the solenoid valve 124 is used to control opening The gas path is opened or blocked; the proportional valve 126 is used to adjust the gas flow rate through the gas path; the number of the at least one nozzle 128 is plural and arranged along the predetermined axis X, and the nozzles 128 are used to output gas. The blower 14 is used to extract air and exhaust it from an air outlet 142.

The gas mixer 16 includes a main body 18, a diverter 42, at least one air outlet pipe 46, and at least one partition 48, which are described below. Among them, the main body 18 is generally elongated and assembled from a plurality of plates. It has an air inlet portion 20 and a gas mixing portion 26. For more details, please refer to FIG. 4. The plates include a top plate 30, a bottom plate 32, a front cover plate 34, a rear cover plate 36, A support plate 38 and two side cover plates 40, wherein the air inlet portion 20 is composed of the bottom plate 32, the front cover plate 34, the support plate 38, and the two side cover plates 40, and the bottom plate 32 has an air inlet 322 In this embodiment, the air inlet 322 is located on the bottom plate 32 At the center in the predetermined axial direction X, the bottom plate 32 has at least one guiding surface 324. In this embodiment, the two guiding surfaces 324 are located in the predetermined axial direction X. On opposite sides of the air inlet 322, each of the guide surfaces 324 is inclined upward from the air inlet 322 in a direction away from the air inlet 322 in the predetermined axis X, and is formed on the opposite sides of the air inlet 322, respectively. Two tapered wind tunnel. The blower 14 is coupled to the bottom plate 32, and an air outlet 142 of the blower 14 is in communication with the air inlet 322.

4 to 6, an air chamber 22 and an air passage 24 are formed between the front cover 34, the support plate 38 and the bottom plate 32. The air chamber 22 is located between the air inlet 322 and the air passage 24. The air chamber 22 communicates with the air inlet 322. Two ends of the air passage 24 are an air vent 242a and an outlet 244a, respectively. The air vent 242a and the outlet 244a are elongated, and the axial direction of the air vent 242a and the axial direction of the outlet 244a are parallel to the predetermined axis. Toward X, the air vent 242a communicates with the air chamber 22. In this embodiment, the air passage 24 has a first section 242 and a second section 244 which communicate with each other, the first section 242 has the vent 242a, the second section 244 has the outlet 244a, and the first section 242 A first reference axis I1 is defined above extending from the vent 242a toward the second section 244, and a second reference axis I2 is defined on the second section 244 extending from the first section 242 toward the exit 244a. An included angle θ between the first reference axis I1 and the second reference axis I2 is greater than 90 degrees and less than 180 degrees.

The front cover plate 34 and the support plate 38 respectively have inclined inclined surfaces 342, 382 near the bottom. The two inclined surfaces 342, 382 form two opposite wall surfaces of the air chamber 22, and the vent 242a is formed on the top of the two inclined surfaces 342, 382. Therefore, the distance between the two inclined surfaces 342 and 382 is gradually reduced from the air inlet 322 to the air outlet 242a. The front cover 34 has at least one recessed groove 344. In this embodiment, the recessed groove 344 is a plurality of and is arranged at intervals of X along the predetermined axis.

The supporting plate 38 has at least one combining hole 384 for combining at least one nozzle 128, and the combining hole 384 forms at least one gas inlet 386 on the inclined surface 382. In this embodiment, the combining hole 384 and gas inlet The number of 386 is plural, and the combining holes 384 and the gas inlets 386 are respectively arranged along the predetermined axis X.

The air mixing portion 26 is composed of the top plate 30, the rear cover plate 36, the two side cover plates 40, the support plate 38 and the top of the front cover plate 34 and is surrounded by a mixing chamber 28. The mixing chamber 28 and The outlet 244 a of the air channel 24 communicates. In this embodiment, the outlet 244 a of the air channel 24 is extended to the upper half of the mixing chamber 28 through a baffle 38 a on the support plate 38. Continuing to refer to FIGS. 5 and 6, the mixing chamber 28 has a polygon on a reference plane parallel to the first reference axis I1, and the polygon defines a geometric center G. The top plate 30 is provided with the at least one air outlet pipe 46. The rear cover plate 36 has at least one recessed groove 362. In this embodiment, there are a plurality of recessed grooves 362 corresponding to the recessed grooves 344 of the front cover plate 34.

The diverter 42 is disposed in the air chamber 22 of the air inlet 20 of the main body 18 and is located between the gas inlets 386 and the air inlet 322. The diverter 42 separates the air chamber 22 into a first space and A second space 224, wherein the first space 222 is in communication with the air inlet 322, and the guide surface 324 of the bottom plate 32 corresponds to the first space 222, the second space 224 is in communication with the air vent 242a and the gas The inlet 386 communicates. Please refer to FIG. 7. In this embodiment, the diverter 42 is elongated and includes a closed end using a flat plate 422 as an example, two vertical plates 424, 424 ', two folded plates 426, and two inclined plates 428. Among them, the plate 422 faces the vent 242a; the two risers 424, 424 'are respectively connected to two opposite side edges of the flat plate 422, and the two risers 424, 424' face the slope 342 of the front cover 34 and the support plate 38, respectively. An inclined surface 382, the vertical plate 424 has at least one through hole 424a facing the inclined surface 382 of the support plate 38. In this embodiment, the number of through holes 424a is plural and is arranged along the predetermined axis X, and another vertical plate 424 ' In addition, there are a plurality of through holes 424a 'arranged along the predetermined axis X and facing the inclined surface 342 of the front cover 34 (that is, the same as the gas Wall surface opposite to the entrance 386), the first space 222 and the second space 224 communicate through the through holes 424a, 424a '; each of the folded plates 426 is located on one side of each of the standing plates 424, 424' and each of the inclined surfaces 342, 382 Each of the inclined plates 428 is connected to one side of each of the standing plates 424, 424 'and abuts on each of the inclined surfaces 342, 382, respectively. The sum of the cross-sectional area of the passages of the through holes 424a, 424a 'is preferably not less than the cross-sectional area of the passage of the air inlet 322, so as to reduce the back pressure generated when the blower 14 outputs the airflow.

In this embodiment, each of the folding plates 426 has a plurality of shunting holes 426a arranged along the predetermined axis X, and a plurality of closing pieces 44 are detachably provided on the folding plates 426, and these closing pieces 44 are for use. The user selectively closes at least a part of the shunt hole 426a. In practice, the closing member 44 may be implemented by using a metal sheet, such as an aluminum foil tape. The airflow entering the second space 224 from the first space 222 is mainly passed through the through holes 424a, 424a ', and the shunt holes 426a are used to adjust the airflow. For areas with large airflow, users The shunt hole 426a in this area may be closed with a closing member 44. In practice, the shunt holes 426a may not be provided.

The at least one air outlet pipe 46 is disposed at the air mixing portion 26 of the main body 18. More specifically, the at least one air outlet pipe 46 is threaded through the top plate 30. The number of the at least one air outlet pipe 46 is plural and follows the The predetermined axial direction X is arranged, and the axial direction of each air outlet pipe 46 is parallel to the first reference axis I1 on the first section 242 of the air passage 24. Each of the outlet tubes 46 has a first end 462, a second end 464, and a tube 466 between the first end 462 and the second end 464. The first end 462 and a part of the tube 466 protrude. Extends into the mixing chamber 28, and the first end 462 is adjacent to the center of the mixing chamber 28, preferably, the first end 462 is located between 1/4 and 3/4 in the longitudinal direction of the mixing chamber 28; The second end 464 is in communication with the burner 10; the outlet 244a of the air passage 24 corresponds to the tube body 466. The mixing chamber 28 is polygonal on a reference plane parallel to the axial direction of each of the outlet pipes 46. The aforementioned polygon is octagonal in this embodiment, but it is not limited thereto, and the polygon may be a triangle or more. Or round. The first end 462 of each outlet tube 46 is adjacent to the polygonal geometry The center G is located between the exit 244a of the airway 24 and the geometric center G. The mixing chamber 28 communicates with the burners 10 through the air outlet pipes 46. The ratio of the sum of the minimum channel cross-sectional area of each air duct 46 to the minimum channel cross-sectional area of the air duct 24 is between 1.2 and 0.8.

4 to FIG. 6 and FIG. 8, the at least one partition plate 48 is disposed on the main body. In this embodiment, the number of the partition plates 48 is plural and they are juxtaposed along the predetermined axis X. Each of the partition plates 48 includes A first portion 482, a second portion 484, and a third portion 486 are respectively located in the second space 224, the air passage 24, and the mixing chamber 28, and each of the partition plates 48 is embedded in the rear cover 36. The grooves 362 and the recessed grooves 344 of the front cover 34 make the interval between the partition plates 48 the same. A first portion 482 of the partition plates 48 divides the second space 224 into a plurality of subspaces 224a, a second portion 484 separates the air passage 24 into a plurality of sub-airways 24a, and a third portion 486 separates the mixing chamber 28 It is a plurality of sub-mixing chambers 28a. Each of the sub-mixing chambers 28a has at least one of the air outlet pipes 46; 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.

With the above structure, the case where the gas mixer 16 of this embodiment is used to mix gas and air will be described below with reference to FIGS. 9 and 10. Please refer to FIG. 9, after the air output from the air outlet 142 of the blower 14 is injected from the air inlet 322 into the first space 222 of the air chamber 22, part of the air flow will flow upward, and part of the air flow will be affected by the two guide surfaces. 324 shadow guide flows along the surfaces of the two guide surfaces 324 toward both sides of the air inlet 322, thereby allowing air flow to be introduced into the first space 222 on the two sides of the air inlet 322 without Focused only on the air inlet 322.

Please continue to refer to FIG. 10, the air flow enters the second space 224 through the through holes 424 a and 424 a ′ of the shunt member 42. By using the shunt member 42, the air flow can be prevented from forming a vortex to affect the air flow. When the shunt hole 426a is not closed, part of the airflow also enters the second space through the shunt hole 426a. Since the second space 224 is divided into a plurality of sub-spaces 224a, The air currents of the subspaces 224a will not interfere with each other, so that the air currents can flow stably, and the air currents flow in the subspaces along the surfaces of the two inclined surfaces 342,382, guided by the two inclined surfaces 342,382. To reduce turbulence. When the air flow passes through the gas inlet 386, it will drive the gas flow upward and enter the air vent 242a together. Then, the airflow and gas flow pass through the secondary air passage 24a and are injected into the secondary mixing chamber 28a through the outlet 244a. Since the position of the outlet 244a is located at the outermost periphery of the sub-mixing chamber 28a, the airflow and gas flow will revolve along the wall surface of the sub-mixing chamber 28a, and gradually move from the outside to the geometric center G of the polygon. The air-air flow and the gas flow can be sufficiently mixed in the sub-mixing chamber 28a. In the sub-mixing chamber 28a, the airflow closer to the periphery has a higher flow velocity and a lower pressure, which is favorable for mixing; the airflow closer to the geometric center G has a lower flow velocity and a higher pressure. Therefore, the first end 462 of the air outlet pipe 46 is adjacent to The design of the geometric center G (i.e., adjacent to the center of the mixing chamber 28) facilitates the airflow and gas flow that are mixed at high pressure and uniformly to enter the air outlet pipe 46 from the first end 462, and output from the second end 464 to The burner 10 performs combustion.

In addition, since the ratio of the sum of the minimum channel cross-sectional area of each of the outlet pipes 46 to the minimum channel cross-sectional area of the airway 24 is between 1.1 and 0.9, in other words, the pressure of the airway 24 and the outlet pipe 46 are similar, so when the blower When the amount of air output from 14 and the amount of gas injected from the gas inlet 386 change, the amount of air and gas output from the gas outlet pipe 46 will change accordingly, thereby shortening the reaction time for adjusting the flame output from the burner 10.

FIG. 11 shows a gas mixer 16 ′ according to a second preferred embodiment of the present invention, which has a structure substantially the same as that of the first embodiment, except that the first embodiment is not provided in the main body 18 in this embodiment. The partition 48. Although the partition 48 is not provided in this embodiment, the design of the guide and mixing chamber 28 through the two inclined surfaces of the air chamber 24 (only the inclined surface 382 is shown in the figure and the other inclined surface 342 is not shown in the figure). The gas flow is still well mixed.

FIG. 12 shows a gas mixer 16 "according to a third preferred embodiment of the present invention, which has a structure substantially the same as that of the first embodiment, except that the air inlet 322 'on the bottom plate 32' of the main body 18 ' It is located on one side of the center of the bottom plate 32 'in the predetermined axial direction X. A guide surface 324' of the bottom plate 32 'is still inclined from the air inlet 322' upwardly away from the air inlet 322 'to form a taper. Air duct.

According to the above, the gas mixer of the present invention can effectively allow air and gas to be fully premixed in the gas mixer, thereby improving the combustion efficiency of the burner, and having a short reaction time for adjusting the size of the flame output by the burner. effect.

The above descriptions are only the preferred and feasible embodiments of the present invention, and any equivalent changes made by applying the description of the present invention and the scope of patent application should be included in the patent scope of the present invention.

Claims (16)

A gas mixer is used to communicate with at least one burner. The gas mixer includes: a main body having an air inlet portion and a gas mixing portion, wherein the air inlet portion has an air inlet, at least one gas inlet and one An air passage, which is in communication with the air inlet and the gas inlet, the air prop has an outlet; the air mixing part has a mixing chamber in communication with the outlet; and at least one air outlet pipe, which is connected to the air mixing part of the main body, the air outlet The trachea has a first end, a second end, and a tube located between the first end and the second end, wherein a part of the tube and the first end protrude into the mixing chamber, and the airway The outlet corresponding to the pipe body; the second end communicates with the burner. The gas mixer according to claim 1, wherein the mixing chamber has a polygon on a reference plane parallel to the axial direction of the outlet pipe; the first end of the outlet pipe is adjacent to the geometric center of the polygon. The gas mixer of claim 2, wherein the first end of the air outlet pipe is located between the outlet and the geometric center of the polygon. The gas mixer of claim 1, wherein a first end of the air outlet pipe is adjacent to a center of the mixing chamber. The gas mixer according to claim 1, wherein the number of the at least one outlet pipe is plural, and the outlet pipes are arranged along a predetermined axial direction; the axial direction of the outlet is parallel to the predetermined axial direction. The gas mixer according to claim 5, wherein the air inlet portion of the main body has an air chamber, which is in communication with the air inlet, and the gas inlet is located on the wall of the air chamber; the air passage has a first One segment and one second segment, one end of the first segment has a vent to communicate with the air chamber, and the second segment has the outlet; the first segment defines a first reference axis from the vent to the first Two sections extend in the direction, and a second reference axis is defined on the second section extending from the first section to the exit direction, wherein the first reference axis is parallel to the axial direction of each air outlet pipe, and the first An included angle between the reference axis and the second reference axis is greater than 90 degrees and less than 180 degrees. The gas mixer according to claim 6, comprising a diverter, arranged in the air chamber and dividing the air chamber into a first space and a second space, the first space communicating with the air inlet, the first Two spaces are in communication with the air vent, and the shunt member has a plurality of through holes arranged along the predetermined axis and communicates the first space and the second space; the air chamber has two opposite wall surfaces, and the two wall surfaces are inclined and The distance between each other gradually decreases from the air inlet to the vent; the number of gas inlets is plural and arranged along the predetermined axis, and the gas inlets are located on one of the walls and correspond to the second Space; the through holes face the wall surface with the gas inlets. The gas mixer according to claim 7, wherein the diverter comprises a closed end and a vertical plate connected to a side edge of the closed end, the closed end face is facing the air vent, and the vertical plate has the through holes. The gas mixer according to claim 8, wherein the diverter includes another vertical plate connected to the other side edge of the closed end, and the other vertical plate further has a plurality of through holes arranged along the predetermined axial direction and facing The wall surface opposite these gas inlets. The gas mixer according to claim 9, comprising a plurality of closure members detachably coupled to the diverter; wherein the diverter includes two folded plates, each of which is located at the position of each of the vertical plates. Between one side and each of the wall surfaces, each of the folded plates has a plurality of shunting holes arranged along the predetermined axial direction; the closing members selectively close at least a part of the shunting holes. The gas mixer according to claim 7, wherein the main body includes a bottom plate having the air inlet; the bottom plate has at least one guiding surface corresponding to the first space, and the guiding surface is connected in the predetermined axial direction. The air inlet is inclined upward from the air inlet in a direction away from the air inlet to form at least one tapered air duct. The gas mixer according to claim 11, wherein the number of the at least one guide surface is two, and the two guide surfaces are located on opposite sides of the air inlet in the predetermined axial direction. The gas mixer according to claim 11, wherein the air inlet is located on one side of a center of the bottom plate in the predetermined axial direction. The gas mixer according to claim 11, comprising at least one partition plate disposed on the main body, the partition plate including a first part, a second part, and a third part respectively located in the second space and the air passage. And the mixing chamber, wherein the first part divides the second space into a plurality of sub-spaces, the second part divides the air passage into a plurality of sub-air passages, and the third part divides the mixing chamber into a plurality of sub-mixes room. The gas mixer according to claim 14, wherein the number of the at least one partition plate is a plurality, and the partition plates are juxtaposed along the predetermined axis; each of the sub-mixing chambers has at least one of the gas outlet pipes; The secondary space communicates with at least one of the through holes and at least one of the gas inlets. The gas mixer according to claim 5, wherein a ratio of a sum of a minimum channel cross-sectional area of each air outlet pipe to a minimum channel cross-sectional area of the airway is between 1.2 and 0.8.