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CN-122015085-A - Gas burner and kitchen range using same

CN122015085ACN 122015085 ACN122015085 ACN 122015085ACN-122015085-A

Abstract

The invention relates to a gas burner and a stove using the gas burner, which comprises an injection channel and a mixing chamber, wherein the injection channel comprises a contraction section, a diffusion section and a throat section positioned between the contraction section and the diffusion section, an injection air outlet of the injection channel is communicated with a mixing air inlet of the mixing chamber, the mixing chamber is also provided with a first backflow port, the first backflow port and the mixing air inlet are arranged at intervals along the length direction of the mixing chamber, the injection channel is also provided with a second backflow port, and the second backflow port is communicated with the first backflow port through the backflow channel so that gas flows back from the mixing chamber to the injection channel and flows towards the injection air outlet. The invention can entrain a part of primary air by the reflux air flow, and the auxiliary enhancement of the capability of the nozzle for ejecting the primary air. And mixed gas flows back to the injection channel, and is injected through the injection channel to enter the mixing chamber again for mixing, so that the mixing effect of gas and air is improved, and the combustion rate of gas is improved.

Inventors

  • LU HUASHI
  • CAI FAN
  • YU TING
  • CHEN ANLIN

Assignees

  • 宁波方太厨具有限公司

Dates

Publication Date
20260512
Application Date
20260108

Claims (12)

  1. 1. A gas burner comprising an injection channel (20) and a mixing chamber (11), wherein the injection channel (20) comprises a contraction section (201), a diffusion section (203) and a throat section (202) positioned between the contraction section (201) and the diffusion section (203), an injection air outlet (22) of the injection channel (20) is communicated with a mixing air inlet (111) of the mixing chamber (11), and is characterized in that, The mixing chamber (11) is further provided with a first backflow port (41), the first backflow port (41) and the mixing air inlet (111) are arranged at intervals along the length direction of the mixing chamber (11), the injection channel (20) is further provided with a second backflow port (42), and the second backflow port (42) is communicated with the first backflow port (41) through the backflow channel (4) so that air flows back from the mixing chamber (11) to the injection channel (20) and flows towards the injection air outlet (22).
  2. 2. The gas burner of claim 1, wherein the second backflow port (42) is located at one of the convergent section (201), the throat section (202) or the junction of the convergent section (201) and the throat section (202).
  3. 3. A gas burner according to claim 1, wherein the cross-sectional area of the return channel (4) increases in size from the first return opening (41) to the second return opening (42).
  4. 4. A gas burner according to any one of claims 1 to 3, wherein the longitudinal section of the mixing chamber (11) is arc-shaped, the mixing air inlet (111) is located at a midpoint of the mixing chamber (11) along the length direction thereof, the first return openings (41) are respectively arranged at the end parts of the two ends of the mixing chamber (11), the second return openings (42) are two and are in one-to-one correspondence with the first return openings (41), and each second return opening (42) is respectively communicated with the corresponding first return opening (41) through the return channel (4).
  5. 5. The gas burner according to claim 4, wherein the injection channel (20) extends horizontally along the central line of the mixing inlet (111), and each second return port (42) is symmetrically opened on both side walls of the injection channel (20) with the central line of the injection channel (20) as a center.
  6. 6. A gas burner according to claim 5, wherein each return channel (4) extends obliquely from its first return opening (41) to its second return opening (42) towards the injection gas outlet (22).
  7. 7. A gas burner according to claim 4, wherein the cross section of the mixing chamber (11) is rectangular, the mixing inlet (111) is provided on the inner side wall of the lower part of the mixing chamber (11), the first return openings (41) are provided at the lower ends of the end walls of the mixing chamber (11), and the top wall of the mixing chamber (11) is provided with mixing outlets (112) at intervals in the circumferential direction.
  8. 8. The gas burner according to claim 7, further comprising a gas mixing seat (5), wherein the gas mixing seat (5) is provided with an annular outer ring gas mixing groove (510), the top of the outer ring gas mixing groove (510) is open, an outer ring fire cover (8) is shielded along the circumferential direction to form an outer ring gas mixing cavity (511), the bottom wall of the outer ring gas mixing groove (510) is provided with an outer ring gas inlet (5101), the outer ring gas inlets (5101) are in one-to-one correspondence with the gas mixing outlets (112), and each outer ring gas inlet (5101) is respectively in fluid communication with the corresponding gas mixing outlet (112).
  9. 9. The gas burner according to claim 8, further comprising a cylindrical base (1) and an ejector tube (2), wherein the inner cavity of the ejector tube (2) forms the ejector channel (20), one side of the base (1) is provided with an axially penetrating notch (10), the side wall of the base (1) is hollow to form the mixing chamber (11), the ejector tube (2) is penetrated in the notch (10) along the radial direction of the base (1), and the ejector gas outlet (22) end of the ejector tube (2) is fixed with the base (1), gaps between the outer side surfaces of the ejector tube (2) and the inner side surfaces of the bases (1) at two sides are respectively shielded by a first bottom wall (7) extending horizontally, and each backflow channel (4) is respectively formed in the corresponding first bottom wall (7).
  10. 10. The gas burner according to claim 9, wherein the gas mixing seat (5) is further provided with an inner ring gas mixing groove (520) with a circular cross section, the inner ring gas mixing groove (520) is centrally arranged in a central hole of the outer ring gas mixing groove (510), the top of the inner ring gas mixing groove (520) is open, a disc-shaped inner ring fire cover (9) is shielded to enclose an inner ring gas mixing cavity (521), inner ring gas inlets (5201) are circumferentially spaced on the peripheral wall of the inner ring gas mixing groove (520), air vents (5102) are circumferentially spaced on the inner ring wall of the outer ring gas mixing groove (510), the air vents (5102) are in one-to-one correspondence with the inner ring gas inlets (5201), and each air vent (5102) is respectively communicated with the corresponding inner ring gas inlet (5201) through radially extending vent pipes (53).
  11. 11. The gas burner according to claim 10, wherein the gas mixing seat (5) comprises an annular outer ring gas mixing seat (51) and a cylindrical inner ring gas mixing seat (52) with a closed bottom, wherein the top of the outer ring gas mixing seat (51) is concave downwards along the circumference to form the outer ring gas mixing groove (510), the inner part of the inner ring gas mixing seat (52) forms the inner ring gas mixing groove (520), And, mix gas seat (5) just locates on base (1), and the mouth edge of each gas outlet (112) that mixes is vertical upwards extended along circumference respectively and is formed outlet duct (12), and the upper port of each outlet duct (12) is linked together with outer loop air inlet (5101) that corresponds respectively, and is limited between adjacent outlet duct (12) and is located mix gas seat (5) and secondary air import (6) between base (1).
  12. 12. A stove comprising a gas burner as claimed in any one of claims 1 to 11.

Description

Gas burner and kitchen range using same Technical Field The invention relates to the field of stoves, in particular to a gas burner and a stove using the same. Background The conventional gas burner has a structure as shown in fig. 7, in which gas with a certain pressure is sprayed from a nozzle 3 'into an injection pipe 2', primary air is injected by changing the pressure into high-speed air flow in a contraction section 201 'of the injection pipe 2', the pressure is reduced to 0, the pressure is changed into negative pressure in a section 202 'of a throat, the pressure is gradually increased by a diffusion section 203', the primary air and the gas are mixed in a mixing chamber 11', and finally the mixture is sprayed from a fire hole 4', and the mixture is combusted to generate waste gas. In order to improve combustion efficiency and reduce exhaust emission, a burner for a gas range has an effective measure of improving the primary air ratio. In order to improve the primary air coefficient, the method mainly comprises the following steps of (1) adopting two or more nozzles or two or more injection pipes to increase the contact area of coal gas and primary air, (2) lengthening the injection pipes, increasing the size of the burner, reducing energy loss, prolonging the mixing time of the coal gas and the primary air, (3) increasing the combustion area, and (4) adopting forced air blasting to improve the injection capacity of part of the burner. The first approach is currently the most widely adopted solution, however, multiple nozzles or multiple injection tubes increase the size of the burner and increase the cost. Meanwhile, multiple nozzles (multiple injection pipes essentially inevitably lead to multiple nozzles) inevitably lead to a reduction in the aperture of a single nozzle, which not only leads to easy blockage of the nozzle, but also is very difficult to process, because the smaller the aperture of the nozzle is, the smaller the depth of the nozzle is, which leads to a multiple increase in processing difficulty. In addition, the multi-nozzle structure is required to be installed compactly, so that the overall dimension of a single nozzle cannot be excessively large, and when the nozzle aperture is partially required to be large, the condition that the nozzle aperture is equal to or even larger than the nozzle bottom diameter can occur when the nozzle aperture is excessively small, and at the moment, the primary air coefficient is reduced, and even the single nozzle cannot be used at all. The second way is the most effective and reliable scheme for improving the primary air coefficient at present, however, the cost of the burner is greatly increased, and the size of the whole machine is increased due to the increase of the size of the burner, and finally the cost of the whole machine is greatly increased again. The third approach has the major disadvantage of flameout noise, even flashback, and products employing this approach have complaints and returns. The fourth mode is mainly applied to gas water heater, different and gas water heater, and the gas-cooker is generally configured with two or even more than two combustors, needs to dispose a plurality of fans simultaneously to realize the blast like this, leads to manufacturing cost increase by a wide margin, and the structure of gas-cooker is less, and operational environment is abominable, and the requirement to the fan is higher, also can increase the manufacturing cost of gas-cooker in the intangible like this. Disclosure of Invention The first technical problem to be solved by the invention is to provide a gas burner with high primary air coefficient aiming at the prior art. The second technical problem to be solved by the invention is to provide a gas burner with high primary air coefficient and high gas combustion rate aiming at the prior art. The third technical problem to be solved by the invention is to provide a stove with the gas burner aiming at the prior art. The technical scheme adopted for further solving at least one technical problem is as follows: the utility model provides a gas burner, includes injection passageway and mixing chamber, and this injection passageway includes shrink section, diffusion section and is located the throat section between shrink section and the diffusion section, and the injection gas outlet of injection passageway is linked together with the mixed air inlet of mixing chamber, a serial communication port, mixing chamber still has first return port, this first return port with the length direction interval setting of mixing chamber is followed to the mixed air inlet, and injection passageway still has the second return port, this second return port with first return port is linked together through the return passage to make gaseous follow mixing chamber backward flow to injection passageway and towards injecting the gas outlet direction flow. Further, the second return port is located at one of the con