CN111174202A

CN111174202A - Self-adaptive premixing burner

Info

Publication number: CN111174202A
Application number: CN202010074459.1A
Authority: CN
Inventors: 王彦
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-01-22
Filing date: 2020-01-22
Publication date: 2020-05-19

Abstract

The invention relates to the field of commercial gas stoves, in particular to a self-adaptive premix burner. The self-adaptive premixing combustor comprises a premixing chamber, a first air conduit, a second air conduit, a gas conduit and a combustion chamber; the first air conduit and the gas conduit are both in communication with the premix chamber; the premixing chamber is provided with a plurality of premixed gas outlets for discharging premixed gas to the combustion chamber; the second air conduit communicates with an end of the combustion chamber proximate the premix chamber. The self-adaptive air quantity and gas quantity proportioning device is simple in structure, can adjust the gas feeding quantity only, can realize the self-adaptive proportioning of the air quantity and the gas quantity only by adjusting the gas feeding quantity according to the heat load use requirement, and is simple to operate and good in universality.

Description

Self-adaptive premixing burner

Technical Field

The invention relates to the field of commercial blowing gas cookers, in particular to a self-adaptive premix burner.

Background

At present, the conventional blowing type premixing combustion system mainly has two control modes of the premixing proportion of gas and air.

The first is that the gas heat load changes the gas regulating valve according to the use demand, and simultaneously drives the regulating valve of the air pipeline to change through mechanical devices such as chains, gears, transmission shafts, connecting rods and the like, so as to regulate the air blast volume to adapt to the reasonable air demand of gas combustion.

That is, the supply of air and the supply of gas are controlled by two different valves, which are connected in a relationship by a series of structures, such that when one of the valves is adjusted, the other valve is adjusted together. However, due to the factors such as the difference between the gas and air pressure, the difference between the size and the shape of the valve, and the like, the linear change height of the valve is not consistent, so that the gas and air are difficult to achieve the reasonable proportion in the whole process, the energy is wasted, harmful gas is easy to generate, and the environment is further influenced. Meanwhile, the structure is complex, the failure rate is high, and the stability is poor.

The second is to control the mixing ratio of the fuel gas and the air through an electric proportional control valve, and the specific working principle is that the change of the fuel gas heat load to the use requirement is firstly to adjust the change of the wind speed and the wind quantity through a variable-speed blower, and then the air inlet end of the blower is controlled to suck the fuel gas with the corresponding quantity through the change of the negative pressure with different rotating speeds for premixing.

The second is that the whole reasonable proportion of gas and air is limited by the difference of gas and blast air pressure, the structure of system pipeline, and other factors, and the realization is also difficult and complex, and the universality is poor.

Disclosure of Invention

The invention aims to provide a self-adaptive premix burner, which simplifies the structure, realizes the self-adaptive proportioning of gas and air and can achieve better combustion effect.

The embodiment of the invention is realized by the following steps:

an adaptive premix burner comprising a premix chamber, a first air conduit, a second air conduit, a gas conduit, and a combustion chamber;

the first air conduit and the gas conduit are both in communication with the premix chamber;

the premixing chamber is provided with a plurality of premixed gas outlets for discharging premixed gas to the combustion chamber;

the second air conduit communicates with an end of the combustion chamber proximate the premix chamber.

Preferably, the gas conduit is disposed within the first air conduit, and an axis of an outlet of the gas conduit is coaxial or parallel to an axis of an outlet of the first air conduit.

Preferably, the adaptive premix burner further comprises an air inlet pipe, and one end of the first air duct far away from the premix chamber and one end of the second air duct far away from the combustion chamber are both communicated with the air inlet pipe.

Preferably, the axis of the air inlet duct is perpendicular to the axis of the first air duct.

Preferably, the premix chamber comprises a first mixing chamber and a second mixing chamber;

the first air conduit and the gas conduit are communicated with the first mixing chamber, the first mixing chamber is communicated with the second mixing chamber, and the premixed gas outlet is formed in the second mixing chamber.

Preferably, the inner cavity of the second mixing chamber is shaped like a truncated cone, and the premixed gas outlet is arranged on the end face of one end with a larger area of the truncated cone; the end face of the end with the smaller area of the second mixing chamber is provided with an opening, and the second mixing chamber is communicated with the first mixing chamber through the opening end.

Preferably, the premixing chamber further comprises a pre-mixing chamber, the first air duct and the gas duct are both communicated with the pre-mixing chamber, and the pre-mixing chamber is communicated with the first mixing chamber.

Preferably, the combustion chamber comprises a first combustion chamber and a second combustion chamber;

the first combustion chamber is communicated with the premixing chamber through the premixed gas outlet, the second combustion chamber is communicated with the first combustion chamber, and the second combustion chamber is arranged at one end of the first combustion chamber far away from the premixing chamber;

the second air duct is in communication with the first combustion chamber.

Preferably, the adaptive premix burner further comprises an air chamber, and the air chamber is annularly arranged outside the first combustion chamber.

Preferably, the premix chamber is cylindrical, and the inner pipe wall of the first air conduit is tangential to the inner side wall of the premix chamber.

Preferably, the axis of the premix chamber is perpendicular to the axis of the first air conduit;

and/or the presence of a gas in the gas,

the inner pipe wall of the second air conduit is tangential to the inner side wall of the air chamber.

The invention has the beneficial effects that:

the method comprises the following steps that firstly, air and gas are mixed in a premixing chamber through a first air duct and a gas duct, then the mixed gas enters a combustion chamber through a premixed gas outlet for combustion, when the throughput of the gas in the gas duct is changed through a control valve, the expansion pressure generated by combustion in the combustion chamber is changed along with the change of the expansion pressure, and the inhibition effect on the air in the air chamber entering the first combustion chamber through the air outlet can be correspondingly changed, so that the air quantity entering the first combustion chamber through the air outlet of the air chamber is correspondingly changed, the purposes of matching the corresponding air quantity and participating in combustion are achieved, new balance is formed under the action of various related new change conditions, and the gas can be fully combusted; the invention has simple structure, simple operation and good universality, and only needs to adjust the gas feeding amount when the heat load needs to be changed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural diagram of an adaptive premix burner according to an embodiment of the present invention;

3 fig. 3 2 3 is 3 a 3 sectional 3 view 3 a 3- 3 a 3 of 3 fig. 3 1 3. 3

In the figure:

1: an air inlet pipe; 2: a first air conduit; 3: a gas conduit; 4: a second air conduit; 5: an air chamber; 6: a first mixing chamber; 7: closing the plate; 8: a premix gas outlet; 9: gas burning; 10: air; 11: mixing the gas; 12: a second mixing chamber; 13: a premix gas side outlet; 14: a first combustion chamber; 15: a second combustion chamber; 16: a pilot flame burner; 17: an air outlet; 18: a combustion chamber of ever-burning flame; 19: an air inlet; 20: a pre-mixing chamber.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the present invention will be described in detail below with reference to fig. 1 and 2. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

An adaptive premix burner comprising a premix chamber, a first air conduit 2, a second air conduit 4, a gas conduit 3 and a combustion chamber; the first air duct 2 and the gas duct 3 are both communicated with the premixing chamber; the premixing chamber is provided with a plurality of premixed gas outlets 8 for discharging premixed gas to the combustion chamber; the second air duct 4 communicates with the end of the combustion chamber close to the premixing chamber.

Specifically, in this embodiment, only be provided with the control valve on the anterior segment gas pipeline of gas pipe 3, control the flame when burning through the control valve, control the burning heat load promptly, and can obtain the design heat load and use the whole comparatively ideal gas of change and air rational ratio for simple structure controls conveniently.

Starting from closing, opening a control valve on a front section gas pipeline of the gas conduit 3 to a minimum flame combustion state, namely a designed state at the time of minimum stable combustion heat load, wherein flame is combusted in the first combustion chamber 14 at the moment, all parts realize balance under the action of forward and reverse forces, then opening degree is increased through the control valve so as to increase gas throughput, and new rebalancing is realized through various action mechanisms in real time and dynamically in the process until the maximum.

More specifically, in the present embodiment, the premix gas outlet 8 is provided on the seal plate 7, and the seal plate 7 is used to close the premix chamber.

Preferably, the gas conduit 3 is arranged inside the first air conduit 2, the axis of the outlet of the gas conduit 3 being coaxial or parallel to the axis of the outlet of the first air conduit 2.

Specifically, in the present embodiment, the gas conduit 3 and the first air conduit 2 are coaxially disposed, the outlet of the gas conduit 3 is at the axial end of the gas conduit 3, and the outlet of the first air conduit 2 is at the axial end of the first air conduit 2.

The specific use principle is as follows: the air from the first air duct 2 and the gas from the gas duct 3 are mixed in the premix chamber, discharged through the premix gas outlet 8 and the premix gas side outlet 13, and then contacted with the long open flame generated by the long open flame burner 16, when the discharge amount of the mixture reaches the minimum design use heat load, the mixture is ignited by the long open flame, the gas amount and the air amount at the moment realize relatively reasonable proportion under the conditions of design pressure, resistance, caliber and the like, and dynamic balance is achieved, so that the flame combustion can be sufficient and stable, the ignited flame can generate certain sufficient flame expansion pressure through sufficient and stable combustion in the first combustion chamber, the expansion pressure can enter the first combustion chamber 14 through the air outlet 17 of the air chamber 5 to the air in the air chamber 5, and the mixed gas in the second mixing chamber to the first combustion chamber 14 through the premix gas outlet 8, all produce certain inhibition; when the gas throughput of the gas duct 3 is gradually increased by means of the control valve, the corresponding proportional increase in the amount of blast air is achieved by the following four mechanisms of action:

firstly, as shown in fig. 1, because the gas conduit 3 and the first air conduit 2 are coaxially arranged, and the gas conduit 3 is arranged in the first air conduit 2, the direction of the air flow in the gas conduit 3 is the same as the direction of the air flow in the first air conduit 2, and the gas outlet end of the gas conduit 3 is arranged at the position of the pre-premixing chamber 20, that is, the end closer to the pre-premixing chamber, the air flow entering the first air conduit 2 from the air inlet 19 passes through the first air conduit 2 for a certain distance, and then is guided by the first air conduit 2, when reaching the position of the outlet end of the gas conduit 3, the purpose of coaxial and same direction with the gas flow is realized, then the gas with a certain pressure and the blast air with a certain pressure form the injection function relationship, and form dynamic balance under the respective pressure, resistance and caliber conditions, and the increase of the gas flow passing through the gas outlet end with the same caliber is necessarily the increase of the gas flow velocity, because of mutual injection, the increase of the gas flow velocity inevitably breaks the original balance, so that the injection effect of the gas on the air is relatively enhanced, further more air can enter, the purposes of increasing the air quantity and participating in combustion are realized, and further new balance is formed under the action of various related new change conditions.

(II) under the condition of minimum design and use heat load, the flame burning in the first combustion chamber can generate certain flame expansion pressure, the expansion pressure can generate certain inhibition effect on the air in the second air chamber 5 through the air outlet 17 of the air chamber 5 when entering the first combustion chamber 14, dynamic balance is formed, when the air quantity is gradually increased, if the air cannot be correspondingly increased to a reasonable proportional quantity, the flame burning in the first combustion chamber can be insufficiently burnt due to oxygen deficiency, the combustion expansion pressure of the flame can be correspondingly reduced due to insufficient burning caused by oxygen deficiency, the popular expression is fire softness, and then the inhibition effect on the air in the air chamber 5 entering the first combustion chamber 14 through the air outlet 17 can be correspondingly reduced, so that the air quantity when the air enters the first combustion chamber 14 through the air outlet 17 of the air chamber 5 is correspondingly increased, the purposes of increasing air quantity and participating in combustion are achieved, and then new balance is formed under the action of various related new changing conditions.

(III) under the state of minimum design using heat load, the flame burning in the first combustion chamber can generate certain flame expansion pressure, the expansion pressure can generate certain inhibition effect on the mixed gas entering the second mixing chamber through the premixed gas outlet 8 and form dynamic balance, when the gas quantity is gradually increased, if the air can not be correspondingly increased to a reasonable proportion quantity, the flame burning in the first combustion chamber can be insufficiently burnt due to oxygen deficiency, the combustion expansion pressure of the flame can be correspondingly reduced due to the insufficient burning caused by the oxygen deficiency, the popular expression is fire softness, the inhibition effect on the mixed gas entering of the premixed gas outlet 8 can be correspondingly reduced, the original balance is destroyed, and the dynamic balance inhibition effect on the gas outlet end of the gas conduit 3 and the air inlet end of the first air conduit 2 through the gas conduction in the premixed combustion chamber can be correspondingly reduced, and then through the gas conduction, the dynamic balance inhibition to the gas source end of gas and air will be reduced correspondingly, the reduction of the inhibition will dynamically further increase the gas quantity entering the premixing chamber through the outlet end of the gas conduit 3 before the new balance is established, and will also dynamically further increase the air quantity entering the premixing chamber through the first air conduit 2, because from the safety perspective, the gas source pressure of the gas in the gas and air supply system of the blast type gas cooker is always higher than the gas source pressure of the blast air, so as to avoid the risk of backfire explosion caused by the air flowing backwards into the gas conduit, therefore, the gas pressure is higher than the pressure of the blast air, the change sensitivity of the air entering to the same reverse inhibition is higher than the change sensitivity of the gas entering to the same reverse inhibition, make except that the gas volume increase portion that the valve changes and cause, the gas and the air admission volume that reduce and increase because of reverse inhibitory action, the admission volume that the air increases can be more on the basis of gas and the reasonable burning ratio of air, for example: the reasonable ratio of natural gas to air combustion is 1:10, the respectively increased intake ratio due to the reduced inhibition may be 1:13, and the more intake of this air will take part in the corresponding reasonable ratio of air needed to compensate for some of the increased gas volume due to the adjustment of the valve. The aim of increasing the air quantity and participating in the combustion is thus achieved, so that a new equilibrium is formed under the effect of the respective new changing conditions.

After the gas throughput in the gas conduit 3 is gradually increased through the control valve, the flame which is originally fully and stably combusted in the first combustion chamber in the minimum design using the heat load state can gradually rise to the direction of the second combustion chamber due to the increase of the gas quantity, the main combustion area of the flame can gradually rise to transition to the direction of the second combustion chamber due to the gradual rise of the main fire position, so that the area pressure position in the combustion chamber is changed, the reverse inhibition pressure received by the air outlet 17 of the air chamber 5 can be reduced along with the change of the main fire position, the air quantity entering the first combustion chamber 14 through the air outlet 17 is increased, the purposes of increasing the air quantity and participating in the combustion are realized, and further, new balance is formed under the action of various related new change conditions.

In this embodiment, the adaptive premix burner further includes an air inlet duct 1, and an end of the first air duct 2 away from the premix chamber and an end of the second air duct 4 away from the combustion chamber are both communicated with the air inlet duct 1.

Specifically, in the present embodiment, the axis of the air inlet duct 1 is perpendicular to the axis of the first air duct 2.

The air inlet 19 of the first air duct 2 is arranged on the side wall of the first air duct 2, and the axis of the air inlet 19 is coaxial with the axis of the air inlet pipe 1, so that after air passes through the air inlet pipe 1, the air is directly faced to the air inlet 19 and enters the first air duct 2.

Preferably, the premix chamber comprises a first mixing chamber 6 and a second mixing chamber 12; the first air conduit 2 and the gas conduit 3 are coaxially arranged and are communicated with the first mixing chamber 6, the first mixing chamber 6 is communicated with the second mixing chamber 12, and the premixed gas outlet 8 is communicated with the second mixing chamber 12.

Through two times of premixing, the gas 9 and the air 10 are mixed more fully.

Specifically, in this embodiment, the first mixing chamber 6 is located outside the second mixing chamber 12, and/or the first mixing chamber 6 is located below the second mixing chamber 12, and after the gas 9 and the air 10 are mixed by the first mixing chamber 6, the mixed gas 11 enters the second mixing chamber 12 to be mixed again, so that after mixing twice, the gas 9 and the air 10 are mixed more uniformly, and the gas 9 is ensured to be sufficiently combusted.

Preferably, the second mixing chamber 12 has a truncated cone shape, and the premixed-gas outlet 8 is provided on an end surface of one end having a large area of the truncated cone.

In the present embodiment, the second mixing chamber 12 is provided in a truncated cone shape, and the second mixing chamber 12 is provided entirely within the first mixing chamber 6, with the small end face of the second mixing chamber 12 being on the lower side and the large end face being on the upper side, and the communication position of the second mixing chamber 12 with the first mixing chamber 6 being on the small end face. At this time, the mixed gas 11 in the first mixing chamber 6 firstly passes through the lower end of the second mixing chamber 12, then enters the second mixing chamber 12, and further mixes the gas through the primary space compression and expansion, the change of the primary gas flow direction and the extension of the primary gas flow turning back path, and the mixed gas after changing the direction can more uniformly flow out through the premixed gas outlet 8.

Specifically, the second mixing chamber 12 and the first combustion chamber 14 are separated by a seal plate 7, and a premixed gas outlet 8 is formed in the seal plate 7 to communicate the second mixing chamber 12 with the first combustion chamber 14.

It can be seen from the above that, in this embodiment, to the mixture of air and gas, firstly the route mixes, secondly the air current direction changes the mixture, thirdly obtains the even ascending air current of wanting so that each venthole can go out gas evenly, fourthly the space compression inflation mixes.

It should be noted that, in the present embodiment, the outer shape of the second mixing chamber 12 may be a shape of a truncated cone, or may be another shape, such as a shape of a cylinder, a square column, or the like, as long as it can perform secondary mixing on the mixed gas 11 in the path and direction.

In this embodiment, the inside at the upper end of first mixing chamber 6 is provided with the premixed gas side export 13 that directly communicates with the combustion chamber, its effect is that the relatively microthermal premixed gas air current that utilizes in the first mixing chamber 6 to flow makes the whole inner wall of first combustion chamber 14 can both obtain effectual heat dissipation, because first combustion chamber 14 itself also is a part of combustor overall structure, good heat dissipation is favorable to life's permanent, and second combustion chamber 15 is relatively independent with combustor overall structure, can regard as the consumptive part of easy change, and do not influence the holistic life of combustor. The premix gas side outlet 13 has another function of concentrating the burning fire into a beam, and accordingly preventing the high-level flame from corroding the inner walls of the first combustion chamber 14 and the second combustion chamber 15, and the relatively concentrated flame is also required to meet the characteristics of the commercial blowing gas cooker.

Preferably, the premixing chamber further comprises a pre-mixing chamber 20, the first air duct 2 and the gas duct 3 both communicating with the pre-mixing chamber 20, the pre-mixing chamber 20 communicating with the first mixing chamber 6.

Specifically, in this embodiment, the gas conduit 3 is disposed in the first air conduit 2, the end of the gas conduit 3 is completely contained in the first air conduit 2, and the pre-mixing chamber 20 is formed inside the outlet end of the first air conduit 2, so that the gas output from the gas conduit 3 is mixed with the air in the first air conduit 2 in one step, and then enters the first mixing chamber 6 to be mixed more sufficiently.

Preferably, the combustion chamber comprises a first combustion chamber 14 and a second combustion chamber 15; the first combustion chamber 14 is communicated with the premixing chamber through the premixed gas outlet 8 and the premixed gas side outlet 13, the second combustion chamber 15 is communicated with the first combustion chamber 14, and the second combustion chamber 15 is arranged at one end of the first combustion chamber 14 far away from the premixing chamber; the second air duct 4 communicates with the first combustion chamber 14 through an air chamber 5.

Specifically, in the present embodiment, the second combustion chamber 15 is located above the first combustion chamber 14, the second air duct 4 is connected to the side wall of the first combustion chamber 14 via the air chamber 5, and the open end of the open flame combustion chamber 18 of the open flame burner 16 is located in the first combustion chamber 14.

More specifically, in the present embodiment, the second combustion chamber 15 is a cylinder having a truncated cone structure, and has one end with a larger area connected to the first combustion chamber 14 and one end with a smaller area located upward. By means of the arrangement, the stability of flame can be guaranteed, the concentration of flame temperature can be guaranteed, and the use performance and efficiency of the combustor are improved.

Preferably, the premixing chamber is cylindrical and the inner wall of the first air duct 2 is tangential to the inner side wall of the premixing chamber.

The inner pipe wall of the first air conduit 2 is tangential to the inner side wall of the premixing chamber, so that the air 10 entrained with the gas 9 is screwed into the premixing chamber through the first air conduit 2, which corresponds to increasing the travel of the air 10 entrained with the gas 9 in the premixing chamber.

Similarly, in the present embodiment, the inner pipe wall of the gas conduit 3 is also tangential to the inner side wall of the premixing chamber, so that the gas 9 can increase the stroke of the gas 9 in the premixing chamber when entering the premixing chamber.

The increase of the stroke of the gas 9 and the air 10 in the premixing chamber can enable the gas 9 and the air 10 to be fully mixed, so that the combustion is more sufficient, and the combustion efficiency is ensured.

Preferably, the axis of the premix chamber is perpendicular to the axis of the first air duct 2.

It should be noted that the axis of the premixing chamber and the axis of the first air duct 2 may or may not be perpendicular, as long as the stroke of the air 10 in the premixing chamber can be increased, thereby ensuring uniform mixing of the gas 9 and the air 10.

Preferably, the adaptive premix burner further comprises an air chamber 5, the air chamber 5 being annularly arranged outside the combustion chamber.

Specifically, in the present embodiment, the inner pipe wall of the second air duct 4 is tangential to the inner side wall of the air chamber 5.

From the above, the working principle and the working process of the adaptive premix burner of the present invention are as follows:

the gas 9 with a certain air source pressure enters the gas duct 3 and enters the premixing chamber through the gas duct 3, the air 10 delivered by the blower passes through the air inlet pipe 1, a part of the air enters the first air duct 2 through the air inlet 19 and enters the premixing chamber through the first air duct 2, and a part of the air directly enters the air chamber 5 through the second air duct 4. The gas conduit 3, the first air conduit 2 and the gas conduit 3 are all arranged tangentially with the circular premixing chamber, so that the gas 9 and the air 10 entering the circular premixing chamber can be fully and effectively mixed. The second air duct 4 is arranged tangentially to the circular secondary air chamber 5 to facilitate pressure equalisation of the air 10 entering the air chamber 5 at the air outlets 17 which are approximately circumferentially distributed. The gas duct 3 is coaxially arranged in the first air duct 2, the outlet end of the gas duct 3 is arranged at one side of the first air duct 2 close to the direction of the premixing chamber and does not enter the position of the premixing chamber, namely, the position of the pre-premixing chamber 20, so that the gas 9 coming out of the gas duct 3 can contact and mix with the air 10 in the first air duct 2 in the forward direction and enter the premixing chamber together, the air inlet 19 of the first air duct 2 is arranged at the position which is coaxially and rightly opposite to the air inlet pipe 1 in the axial direction, namely, the axis of the first air duct 2 is vertically arranged with the axis of the air inlet pipe 1, and the stability of the air quantity entering the first air duct 2 is facilitated.

An operator can change the size of the heat load at any time according to different requirements in the using process of the commercial kitchen range, namely, the fire power adjustment, so that a combustor of the commercial kitchen range needs to have a maximum heat load and a minimum stable combustion heat load when being designed, for example, the maximum heat load is 35 kilowatts, and the minimum stable combustion heat load is a target limit value of 8 kilowatts. The gas heat load of the burner can still control and limit the maximum heat load according to the traditional mode by a flow-limiting nozzle at the front end, the gas quantity is controlled by a control valve such as a ball valve, a plug valve and the like to realize the change adjustment and the shutdown of the heat load, and the matching with the reasonable quantity of air 10 corresponding to different heat load changes in the upper and lower limit intervals of the heat load is realized by a self-adaptive mode.

The specific process is that firstly, the size of the passing cross section area of an opening of an air inlet on a first air conduit 2 is set according to a target value of the minimum stable combustion heat load and combined with a test, so that the proportioning of system air 10 can be ensured to be adaptive to the state of the minimum stable combustion heat load, a certain amount of air 10 entering the first air conduit 2 is in forward contact with gas 9 coming out of an outlet end of a gas conduit 3 in the first air conduit 2, enters a circular premixing chamber in a tangential direction together, is rotationally premixed along the inner wall in the premixing chamber, then enters a second premixing chamber from the lower end of the conical second premixing chamber for further sufficient premixing, and the mixed gas enters a first combustion chamber 14 through a premixed gas outlet 8 and a premixed gas side outlet and then starts to be combusted in a primary combustion chamber after encountering a long-flame source of a long-flame combustor 16. If the open position of the control valve is at the minimum steady combustion heat load opening position, the flame will be steady burning in the first combustion chamber 14 at the designed minimum heat load and the combustion is sufficient, and the gas amount is controlled by the control valve and the air amount is controlled by the air inlet opening on the first air conduit 2 which is set to a reasonable throughput.

Since the combustion flame is mainly concentrated at the first combustion chamber 14 and the combustion is sufficiently complete, a regional combustion and expansion pressure is formed around the fully combusted flame, the regional combustion and expansion pressure is mainly concentrated at the first combustion chamber 14, the pressure can form a reverse inhibition effect on the overflow of the mixed gas 11 in the premix chamber through the premix gas outlet 8 and the premix gas side outlet 13, the reverse inhibition effect can be always transmitted to the gas conduit 3 and the first air conduit 2, and the inhibition effect is mainly reflected on the air 10 entering from the first air conduit 2 because the supply pressure of the gas 9 is far higher than the supply pressure of the air 10 of the blower. In addition, the expansion pressure of the combustion flame also has a relatively large counter-inhibiting effect on the air 10 escaping at the outlet of the second air duct 4, in particular at the air outlet 17 of the air chamber 5. That is, the sufficient combustion in the reasonable mixture ratio of the gas 9 and the air 10 at this time is based on the dynamic equilibrium state above the combustion expansion pressure, the gas pressure, the mixed gas 11 pressure, and the secondary air pressure.

In the minimum stable combustion heat load state, along with the gradual increase of the opening degree of the control valve, the previous dynamic balance is gradually destroyed, so that theoretically, the gas quantity is increased and the air quantity is relatively insufficient, the insufficient air quantity can cause insufficient combustion, but simultaneously, the insufficient combustion can also cause the sharp drop of regional combustion expansion pressure, the drop of the pressure can correspondingly cause the sharp drop of the reverse inhibition effect which is mainly acted on the outlets of the first air conduit 2 and the second air conduit, the air quantity under the blast pressure overflowing through the outlet of the first air conduit 2 and the air outlet 17 of the air chamber 5, the increase of the air quantity can eliminate the insufficient combustion caused by the increase of the gas quantity and the insufficient air quantity, and simultaneously, along with the increase of the heat load, the requirement of combustion flame on the combustion expansion space is increased, this inevitably causes the position of the combustion flame in the primary combustion chamber to gradually move upward in the direction of the second combustion chamber 15, and the regional combustion expansion pressure center gradually moves upward away from the premixed gas outlet 8, the premixed gas side outlet 13, the air outlet 17 of the air chamber 5, and the like, and at this time, the increase of the air amount due to the decrease of the regional expansion pressure is converted into the upward movement away of the regional combustion expansion pressure center due to insufficient combustion, so that the reverse suppression effect on the air 10 can be continuously stabilized, the occurrence of surge is avoided, and real-time dynamic rebalancing is realized. The action mechanism is the same as the heat load of the fuel gas 9 is continuously increased until the designed maximum heat load is reached, and the action mechanism is the reverse when the heat load of the fuel gas 9 is reversely adjusted until the designed minimum stable combustion heat load is reached.

The embodiment of the invention has the beneficial effects that:

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An adaptive premixing burner is characterized by comprising a premixing chamber, a first air conduit, a second air conduit, a gas conduit and a combustion chamber;

2. The adaptive premix burner of claim 1, wherein the gas conduit is disposed within the first air conduit, an axis of an outlet of the gas conduit being coaxial or parallel to an axis of an outlet of the first air conduit.

3. The adaptive premix burner of claim 1, further comprising an air inlet duct, wherein an end of the first air duct distal from the premix chamber and an end of the second air duct distal from the combustion chamber are in communication with the air inlet duct.

4. The adaptive premix burner of claim 3, wherein an axis of the air intake duct is perpendicular to an axis of the first air duct.

5. The adaptive premix burner of claim 1, wherein the premix chamber comprises a first mixing chamber and a second mixing chamber;

6. The adaptive premix burner of claim 5, wherein the inner cavity of the second mixing chamber has a shape of a truncated cone, and the premix gas outlet is provided on an end surface of the end of the truncated cone having a larger area; the end face of the end with the smaller area of the second mixing chamber is provided with an opening, and the second mixing chamber is communicated with the first mixing chamber through the opening end.

7. The adaptive premix burner of claim 5, wherein the premix chamber further comprises a pre-mix chamber, the first air conduit and the gas conduit each communicating with the pre-mix chamber, the pre-mix chamber communicating with the first mix chamber.

8. The adaptive premix burner of claim 1, wherein the combustion chamber comprises a first combustion chamber and a second combustion chamber;

the second air duct is in communication with the first combustion chamber.

9. The adaptive premix burner of claim 8, further comprising an air chamber annularly disposed outside the first combustion chamber.

10. The adaptive premix burner of claim 1, wherein the premix chamber is cylindrical and an inner tube wall of the first air conduit is tangential to an inner sidewall of the premix chamber.

11. The adaptive premix burner of claim 10, wherein an axis of the premix chamber is perpendicular to an axis of the first air conduit;

and/or the presence of a gas in the gas,