CN220958458U - Combustion assembly - Google Patents

Abstract

A combustion assembly comprising: a burner (200) having an air inlet channel (201) extending up and down inside, wherein a second fire cover body (360) with a second fire outlet hole (361) is arranged at the upper port of the air inlet channel (201); the tubular nozzle body (110) is internally provided with a runner which extends up and down, the lower end of the runner is provided with a fuel gas inlet (110 a) for inputting a fuel gas source, the upper end of the runner is provided with a fuel gas outlet (110 b) and is inserted into the lower port of the air inlet channel (201), and the side wall of the runner, which is positioned between the upper end and the lower end, is provided with an air inlet (111) penetrating through the wall thickness so as to communicate the runner with the outside. Compared with the prior art, the utility model can reduce the distance from the nozzle main body to the second fire outlet, so that a small amount of fuel gas can quickly reach the second fire outlet, thereby being more suitable for small load.

Description

Combustion assembly

Technical Field

The utility model belongs to the technical field of household stoves, and particularly relates to a combustion assembly.

Background

The existing burner for the gas stove is insufficient in small fire stability or small in small fire, is generally maintained at about 500W, and is extremely easy to automatically flameout due to various boundary condition limitations encountered when load is reduced.

In order to enable stable small fire, chinese patent application No. CN202220328679.7 discloses a burner for gas cooker (issued publication No. CN 217274118U), comprising a base and a gas mixing chamber, wherein the gas mixing chamber comprises an annular inner ring wall, an annular outer ring wall and a bottom wall connecting the inner ring wall and the outer ring wall, and a fire cover is covered above the inner ring wall and the outer ring wall, and is characterized in that: the inner ring wall encloses into and has interior mixed air cavity and is formed with outer mixed air cavity between inner ring wall and the outer ring wall, and correspondingly, the fire lid is including main fire hole and the steady fire hole that is linked together with outer mixed air cavity that is linked together with interior mixed air cavity, communicates through the connecting channel between interior mixed air cavity and the outer mixed air cavity. Therefore, the main fire hole can be stably flame, and meanwhile, the inner mixed air cavity and the outer mixed air cavity can be connected through the connecting channel, so that flameout of the inner mixed air cavity due to fire adjustment is avoided, and all main holes of the fire cover can be ignited again through the stability of the main fire hole, so that the flame is kept normal.

Disclosure of utility model

The first technical problem to be solved by the present utility model is to provide a combustion assembly applicable to small loads, aiming at the current state of the art.

The second technical problem to be solved by the utility model is to provide a combustion assembly for improving the mixing uniformity of fuel gas and air.

The technical scheme adopted by the utility model for solving the first technical problem is as follows: a combustion assembly comprising:

The burner is internally provided with an air inlet channel extending up and down, and the upper port of the air inlet channel is provided with a second fire cover body with a second fire outlet hole;

It is characterized in that the method also comprises the following steps:

The tubular nozzle body is internally provided with a runner which extends up and down, the lower end of the runner is provided with a fuel gas inlet for inputting a fuel gas source, the upper end of the runner is provided with a fuel gas outlet and is inserted into a lower port of the air inlet channel, and the side wall of the runner between the upper end and the lower end is provided with an air inlet penetrating through the wall thickness so as to communicate the runner with the outside.

According to the utility model, the upper end of the nozzle main body is directly inserted into the lower port of the air inlet channel, and an injection pipe is not required to be additionally arranged, so that the distance from the nozzle main body to the second fire outlet hole can be reduced, and a small amount of fuel gas can quickly reach the second fire outlet hole, so that the gas burner is more suitable for small load.

Preferably, the air inlet channel of the burner is provided with an upward extending air mixing section and an upward extending pressure stabilizing section positioned at the downstream of the air mixing section along the flowing direction of the fuel gas, and the flow area of the pressure stabilizing section on the cross section is smaller than that of the air mixing section on the cross section.

So, from the gas outlet spun gas of nozzle main part upper end can mix fully in mixing the gas section, then export from the second flame hole through the steady voltage section, the steady voltage section plays the throttle effect, avoids the too fast and flame that leaves of gas velocity of flow, sets up the purpose of steady voltage section promptly for assuming the function of part stable flame burning, reduces the design requirement of flame lid itself to steady flame hole.

Preferably, the gas outlet of the nozzle body is located upstream of the gas mixing section of the gas inlet channel, and the flow area of the gas outlet of the nozzle body is smaller than the flow area of the gas mixing section in cross section. Therefore, the gas entering the gas mixing section can be decelerated, and the gas is prevented from flowing too fast to leave the flame.

Preferably, the gas mixing section and the pressure stabilizing section of the gas inlet channel are coaxially arranged.

In the above aspect, preferably, the second fire cover body has a top wall, and a ring wall extending downward from a periphery of the top wall, where the ring wall and the top wall together form a second air mixing cavity that communicates with the air intake channel, and the ring wall is circumferentially provided with the second fire outlet that communicates with the second air mixing cavity and the outside.

Preferably, at least part of the flow passage of the nozzle body, which is positioned at the downstream of the air inlet, is a diffuser section, the flow area on the cross section of the diffuser section is gradually increased along the flow direction of the fuel gas, and the port of the diffuser section is the fuel gas outlet of the nozzle body. The diffuser design is beneficial to slowing down the flow rate of the air flow and promoting further mixing of the fuel gas and air. And the gas flow passing through the diffusion section enters the gas mixing section to be further decelerated, and meanwhile, the gas and the air can be further uniformly mixed.

Further, the small end of the diffusion section is connected with the part where the air inlet of the flow channel is located through the throat section, and the flow area on the cross section of the throat section is unchanged along the flow direction of the fuel gas and is consistent with the flow area of the small end of the diffusion section.

Preferably, at least part of the flow passage upstream of the gas inlet is a constriction, the flow area of the constriction in cross section decreasing gradually in the direction of gas flow. The fuel gas can be accelerated after passing through the contraction section, thereby being beneficial to injecting the external air through the air inlet and ensuring the sufficiency of the primary air.

Further, the part of the flow channel, which is positioned at the downstream of the contraction section and at the upstream of the air inlet, is an injection section, and the flow area of the injection section on the cross section is unchanged along the flow direction of the fuel gas and is consistent with the flow area of the small end of the contraction section.

In order to further promote the uniform mixing of the fuel gas and the air, it is preferable that the injection section of the flow passage is joined with the portion of the air inlet of the flow passage by an expansion section, and the flow area on the cross section of the expansion section is gradually increased along the flow direction of the fuel gas. Therefore, the air ejected to the inside of the flow channel through the air inlet surrounds the periphery of the fuel gas ejected through the ejection section so as to be well mixed with the fuel gas.

Preferably, the length of the expansion section is less than the length of the contraction section.

In the above-described aspects, the air inlets may be one, two or more, and in order to secure the primary air supply amount, it is preferable that at least two of the air inlets are arranged at a central position in the longitudinal direction of the nozzle body at intervals in the circumferential direction. The air inlets arranged at intervals along the circumferential direction can simultaneously supply external air to enter, and the structure arranged along the circumferential direction enables the supplemented air to circumferentially surround the periphery of the fuel gas, so that the uniform mixing of the fuel gas and the air is facilitated.

The center position is not limited to the center, and may be offset from the center.

In order to adjust the air injection quantity, the air injection device preferably further comprises a check ring which is sleeved on the periphery of the nozzle main body along the circumferential direction and at least partially shields the air inlet, and the check ring is arranged to move up and down under the action of external force to be away from the air inlet, so that shielding of the air inlet is reduced. Therefore, the air inlet area of the air inlet can be adjusted by adjusting the position of the check ring, and the effect of adjusting the air injection quantity is achieved.

In each of the above schemes, preferably, the combustor is further provided with an annular cavity located at the periphery of the air inlet channel along the circumferential direction, and the peripheral wall of the annular cavity is provided with a first fire outlet hole communicating the annular cavity with the outside along the circumferential direction;

The burner is characterized by further comprising an inner ring injection pipe, wherein the inner ring injection pipe is transversely arranged at the bottom of the burner, the air outlet end of the inner ring injection pipe is communicated with the annular cavity, and the air inlet end of the inner ring injection pipe is positioned in the external environment and correspondingly provided with an inner ring nozzle.

Preferably, the combustion assembly is for a cooktop.

Compared with the prior art, the utility model has the advantages that: according to the utility model, the upper end of the nozzle main body is directly inserted into the lower port of the air inlet channel, and an injection pipe is not required to be additionally arranged, so that the distance from the nozzle main body to the second fire outlet hole can be reduced, and a small amount of fuel gas can quickly reach the second fire outlet hole, so that the gas burner is more suitable for small load.

Drawings

FIG. 1 is a schematic view of a part of a structure of an embodiment of the present utility model;

FIG. 2 is a cross-sectional view (with a vertical plane in section) of an embodiment of the utility model;

fig. 3 is an enlarged view of a portion a in fig. 2;

FIG. 4 is a cross-sectional view (with the cross-section being horizontal) of an embodiment of the utility model;

FIG. 5 is a schematic view of a nozzle according to an embodiment of the present utility model;

FIG. 6 is a longitudinal cross-sectional view of a nozzle in an embodiment of the utility model;

FIG. 7 is a schematic view of the inner ring fire cover according to the embodiment of the utility model;

FIG. 8 is a schematic view of an inner ring fire cover according to an embodiment of the present utility model;

FIG. 9 is a schematic view of an inner ring fire cover according to an embodiment of the present utility model;

FIG. 10 is a bottom view of the inner ring fire cover in an embodiment of the utility model;

FIG. 11 is a cross-sectional view (with the cross-section being horizontal) of an inner ring fire cover in an embodiment of the utility model;

FIG. 12 is a cross-sectional view (with a vertical section) of an inner ring fire cover in an embodiment of the utility model;

fig. 13 is an enlarged view of a part of the structure in fig. 12.

Detailed Description

The utility model is described in further detail below with reference to the embodiments of the drawings.

As shown in fig. 1 to 13, a preferred embodiment of a combustion assembly for a cooking appliance according to the present utility model includes a burner 200, a nozzle 100, an inner ring injection pipe 400, an outer ring injection pipe 500, an ignition needle 301, and a thermocouple 302.

The burner 200 has a base 210, an inner annular flame cover 300 and an outer annular flame cover 600.

As shown in fig. 1 to 4, the base 210 has an air intake passage 201 extending vertically therethrough, an inner ring chamber 202 located circumferentially around the air intake passage 201 and having an open upper end, and an outer ring chamber 203 located circumferentially around the inner ring chamber 202 and having an open upper end.

The inner ring injection pipe 400 is transversely arranged at the bottom of the combustor 200, the air outlet end of the inner ring injection pipe 400 is communicated with the inner ring cavity 202, and the air inlet end of the inner ring injection pipe 400 is positioned in the external environment and correspondingly provided with an inner ring nozzle 401. The outer ring injection pipe 500 is transversely arranged at the bottom of the combustor 200, and the air outlet end of the outer ring injection pipe 500 is communicated with the outer ring chamber 203, and the air inlet end of the outer ring injection pipe 500 is positioned in the external environment and correspondingly provided with the outer ring nozzle 501.

The outer ring fire cover 600 is disposed above the outer ring chamber 203 of the base 210, and has an annular top wall, an inner peripheral wall extending downward from an inner edge of the annular top wall, and an outer peripheral wall extending downward from an outer edge of the annular top wall, and outer ring fire holes are disposed on the outer peripheral wall at intervals along a circumferential direction.

An inner ring fire cover 300 is provided over the air inlet channel 201 of the base 210 and the inner ring chamber 202.

As shown in fig. 7 to 13, the inner ring fire cover 300 includes a first fire cover body 310, a cover body 320, a gas mixing pipe 350, and a second fire cover body 360.

The first fire cover body 310 has a side peripheral wall 311 extending vertically, and a first fire hole 313 is formed in the side peripheral wall 311 along the circumferential direction. And the side peripheral wall 311 is supported on the outer peripheral wall of the inner ring chamber 202.

The cover 320 covers the first fire cover body 310. And the cover 320 has a through hole 323 penetrating through the wall thickness at the center.

The second fire cover body 360 is disposed at a central position above the cover body 320, and has a top wall 362, and a ring wall 363 extending downward from a periphery of the top wall 362 to the cover body 320, the ring wall 363 surrounds the periphery of the through hole 323, the ring wall 363 and the top wall 362 together form a second air mixing cavity 364 communicating with the through hole 323, and the ring wall 363 is circumferentially provided with a second fire outlet 361 communicating with the second air mixing cavity 364 and the outside. The aperture of the single second fire hole 361 is smaller than that of the single first fire hole 313.

The gas mixing pipe 350 is hollow and vertically disposed in the first fire cover body 310. The upper end of the gas mixing pipe 350 is communicated with the through hole 323 on the cover body 320, and the pipe wall of the gas mixing pipe 350 is opposite to the side peripheral wall 311 of the first fire cover body 310 at intervals, so that the pipe wall of the gas mixing pipe 350, the side peripheral wall 311 of the first fire cover body 310 and the corresponding cover body 320 part jointly define an annular cavity 351 with a downward opening, and the annular cavity 351 is communicated with the inner annular cavity of the base 210 for inputting first fuel gas; the lower end of the gas mixing pipe 350 is opposite to and communicates with the upper port of the intake passage 201 for the second gas to be input.

As shown in fig. 5 and 6, the nozzle 100 includes a nozzle body 110 and a retainer 120.

The nozzle body 110 is tubular, and has a flow channel extending along a length direction therein, a gas inlet 110a for gas source input is provided at a head end of the flow channel, a gas outlet 110b for gas output is provided at a tail end of the flow channel, and a gas inlet 111 penetrating through a wall thickness is provided on a side wall of the flow channel between the head end and the tail end for communicating the flow channel with the outside. And at least two air inlets 111 are arranged at the central position in the length direction of the nozzle body 110 at equal intervals in the circumferential direction.

In this embodiment, along the flow direction of the fuel gas from the fuel gas inlet 110a to the fuel gas outlet 110b, the portion of the flow channel located upstream of the air inlet 111 has an input section 117, a contracted section 112, an injected section 113, and an expanded section 114 that are sequentially connected. Along the gas flow direction:

The input section 117 is a straight section with a constant flow area, and the port of the input section 117 is the gas inlet 110a;

The flow area across the cross section of the constriction 112 is progressively smaller;

The flow area of the spray section 113 on the cross section is constant and is consistent with the flow area of the small end of the constriction section 112;

The flow area of the expanded section 114 increases gradually in cross section and the length of the expanded section 114 in the direction of flow of the fuel gas is smaller than the length of the contracted section 112.

Meanwhile, along the flow direction of the fuel gas from the fuel gas inlet 110a to the fuel gas outlet 110b, the portion of the flow channel downstream of the air inlet 111 has a throat section 116 and a diffuser section 115 that are sequentially joined. Along the gas flow direction:

The flow area across the throat section 116 is constant and greater than the flow area across the jet section 113;

the flow area across the diffuser 115 increases gradually. The diffuser 115 is ported to the gas outlet 110b.

In this embodiment, the input section 117, the contraction section 112, the injection section 113, the expansion section 114, the throat section 116 and the diffuser section 115 are coaxially arranged, and the axis is the central axis of the nozzle body 110. And the inclination angle beta of the inner wall of the diffuser 115 relative to the middle axis of the nozzle body 110 is 0-30 deg., which is smaller than the inclination angle of the inner wall of the convergent section 112 relative to the middle axis of the nozzle body 110.

The retainer ring 120 is circumferentially sleeved on the outer periphery of the nozzle body 110 and at least partially shields the air inlet 111, and the retainer ring 120 is arranged to be movable away from the air inlet 111 along the length direction of the nozzle body 110 under the action of external force, so that shielding of the air inlet 111 is reduced. In this embodiment, the outer peripheral wall of the nozzle body 110 is provided with external threads, and the inner ring wall of the retainer ring 120 is provided with mating internal threads, so that the retainer ring 120 is in threaded connection with the nozzle body 110. Thus, the position of the retainer ring 120 can be adjusted by rotating the retainer ring 120, so as to adjust the air inlet area of the air inlet 111.

The positional relationship and the connection structure between the nozzle and the intake passage 201 in this embodiment are as shown in fig. 2 and 3, and are specifically as follows:

The end of the nozzle body 110 where the gas outlet 110b is located is screwed into the gas inlet at the lower end of the gas inlet channel 201 and communicates with the gas inlet channel 201. The air inlet 111 of the nozzle body 110 and the retainer 120 are located outside the air inlet passage 201. And the outer diameter of the portion of the air inlet 111 of the nozzle body 110 is larger than the outer diameter of the end portion of the gas outlet 110b of the nozzle body 110, so that when the end portion of the gas outlet 110b of the nozzle body 110 is screwed into the air inlet of the air inlet channel 201, the portion of the air inlet 111 of the nozzle body 110 abuts against the lower end surface of the air inlet channel 201. So that the depth of the nozzle body 110 into the intake passage 201 can be limited.

In this embodiment, the air inlet channel 201 of the burner 200 has an air mixing section 201a extending upward and a pressure stabilizing section 201b located downstream of the air mixing section 201a and extending upward, and the flow area of the pressure stabilizing section 201b in the cross section is smaller than the flow area of the air mixing section 201a in the cross section. The gas outlet 110b of the nozzle body 110 is located upstream of the gas mixing section 201a of the gas inlet channel 201, and the flow area of the gas outlet 110b of the nozzle body 110 is smaller than the flow area of the gas mixing section 201a in cross section. Meanwhile, the air mixing section 201a and the pressure stabilizing section 201b of the air intake passage 201 are coaxially arranged. Thus, the fuel gas ejected from the fuel gas outlet 110b of the nozzle body 110 sequentially passes through the gas mixing section 201a and the pressure stabilizing section 201b, and then enters the gas mixing pipe 350, and is ignited at the second flame outlet 361.

In this embodiment, as shown in fig. 7 to 13, in order to realize fire transmission, a fire transmission groove 322 extending radially is provided on the upper surface of the cover 320, and the outer end of the fire transmission groove 322 penetrates the periphery of the cover 320 and is located above the first fire outlet 313; the inner end of the fire transfer groove 322 is located at the outer periphery of the second fire cover body 360, adjacent to the annular wall 363 of the second fire cover body 360, and below the second fire outlet 361. The top of the first fire cover body 310 is provided with a first channel 314 extending radially at a position below the fire transmission groove 322, the extending direction of the first channel 314 is consistent with that of the fire transmission groove 322, a first end of the first channel 314 is opened on the pipe wall of the gas mixing pipe 350 and communicated with the gas mixing pipe 350, and a second end of the first channel 314 is opened on the side peripheral wall 311 of the first fire cover body 310 and communicated with the outside and is positioned below the outer end of the fire transmission groove 322; the fire transfer groove 322 is vertically penetrated and communicated with the first channel 314, and the lower end opening of the fire transfer groove 322 is positioned at the center of the top surface of the first channel 314. In this way, the flames at the outer end of the flame propagation groove 322 can be propagated to the second flame outlet 361 of the second flame cover body 360 through the flame propagation groove 322.

In order to achieve ignition and fire protection, the top of the first fire cover body 310 is further provided with a radially extending second channel 315, a first end of the second channel 315 is opened on the wall of the gas mixing tube 350 and is communicated with the gas mixing tube 350, and a second end of the second channel 315 is opened on the side peripheral wall of the first fire cover body 310 and is communicated with the outside. And the second channels 315 are three, are circumferentially spaced and are arranged in a cross shape with the first channels 314. In this embodiment, the second end opening of one of the three second channels 315 is an ignition hole 312, and the ignition hole 312 is oriented horizontally outwards. The ignition hole 312 has a diameter of 1.5 to 2.8mm. In this embodiment, the diameter of the ignition hole 312 may be any value between 1.5 and 2.8mm, such as 1.5mm, 2mm, 2.8mm, etc. for the diameter of the ignition hole 312. And the ignition hole is correspondingly provided with an ignition needle 301, and the second channel 315 where the ignition hole 312 is positioned is denoted as an ignition channel, and the ignition channel and the first channel 314 are arranged in a line. The second end openings of the other two second channels 315 in the three second channels 315 are all fire protection holes 316, wherein one fire protection hole 316 is correspondingly matched with the thermocouple 302, the second channel 315 where the fire protection hole 316 is positioned is a fire protection channel, and the two fire protection channels are arranged between the ignition channel and the first channel 314 in a straight line.

In this way, the second fuel gas flows to the first channel 314 and the second channel 315 through the gas mixing pipe 350, so as to realize the functions of igniting, maintaining flame and transmitting flame to the second flame outlet 361. Because the gas volume in the gas mixing pipe 350 can be kept unchanged or in a very small variation range under various firepower conditions of the gas stove (i.e. the gas stove only adjusts the gas volume entering the annular cavity), the fire hole thermal intensity of the ignition hole, the fire protection hole and the fire transmission hole can be in a very good value or range under any firepower. This is the case: providing a fixed gas concentration during ignition; when the flame is maintained, the flame state and the temperature are stable, and the probability of unsuccessful ignition and the probability of failure to maintain the flame are reduced. Meanwhile, the fire hole of the fire hole has stable heat intensity and good matching, so that the wind resistance of the fire hole flame and the gas backflow resistance of the cabinet during opening and closing are greatly enhanced.

To improve the ignition success rate, the edge of the cover 320 above the ignition hole 312 has a portion extending outward in the radial direction to form a water blocking eave 321, the lower surface of the water blocking eave 321 is provided with a boss 330 extending downward, and the boss 330 has a bottom surface 331 and a first side surface 332 opposite to the side peripheral wall 311 of the fire cover body 310; the bottom surface 331 of the boss 330 is located above the lower edge of the ignition hole 312 and below the upper edge of the ignition hole 312; the first side 332 of the boss 330 is opposite to the side peripheral wall 311 of the fire cover body 310 at intervals, and forms a cavity 334 with a downward opening together with the water retaining eave 321 (the cavity 334 is arranged so that part of the fuel gas output from the ignition hole firstly enters the cavity 334 and enters the air-entraining channel 333 along the top wall of the cavity 334 and the first side of the boss 330), and part of the fuel gas directly enters the air-entraining channel 333 through the cavity 334, so that most of the fuel gas can smoothly enter the air-entraining channel 333. Meanwhile, the boss 330 is provided with a bleed air channel 333 inside, a first end of the bleed air channel 333 is opened at the first side 332 of the boss 330 and is opposite to the upper portion of the ignition hole 312 and the portion of the side peripheral wall 311 of the fire cover body 310 above the ignition hole 312 (i.e. the first end opening of the bleed air channel 333 is disposed adjacent to the top wall of the cavity 334), and a second end of the bleed air channel 333 is opened at the bottom surface 331 of the boss 330. In this way, after the fuel gas comes out from the ignition hole 312, the fuel gas can enter the bleed air channel 333 through the first end opening of the bleed air channel 333 and be output from the second end opening of the bleed air channel 333, so that the fuel gas can gather below the boss 330, and the ignition success rate and the ignition speed when the ignition needle discharges are improved.

In this embodiment, the bleed air channel 333 extends obliquely downward from the first side 332 of the boss 330 to the bottom surface 331 of the boss 330. The angle a between the bleed air channel 333 and the horizontal plane is 45-60 deg.. As shown in fig. 13, the included angle a may be any value between 45 ° and 60 °, for example, the included angle a may be 45 °, 50 ° or 60 °. If the included angle a is too small, the gas can easily pass through the gas-entraining channel 333 at a higher speed, so that the gas below the boss 330 is easy to be dispersed, and the concentration of the gas aggregation is affected; if the angle a is too large, the flow rate of the gas in the bleed air channel 333 is too slow, which affects the rate of accumulation of the gas below the boss 330. The included angle of 45-60 degrees in the utility model can control the speed of the fuel gas from the air entraining channel 333 to the lower part of the boss 330, so that the gathering speed and concentration of the fuel gas below the boss 330 are proper.

In order to avoid gas escape, the lower surface of the water retaining eave 321 is further provided with a C-shaped primary enclosure 340, the primary enclosure 340 is located at the periphery of the boss 330, and the C-shaped opening of the primary enclosure 340 faces the side peripheral wall 311 of the fire cover body 310. The two ends of the primary enclosure 340 are opposite to the corresponding side peripheral walls 311 of the fire cover body 310, and are adjacent to or attached to each other. To enclose and intercept the gas output from the ignition holes 312 such that the gas is concentrated in the C-shaped opening of the primary enclosure 340, thereby causing the gas to collect near the boss 330. In this embodiment, the boss 330 further has a second side 335 facing away from the side peripheral wall 311 of the fire cover body 310, and the second side 335 is attached to the inner side of the primary enclosure 340. And the bottom surface 331 of the boss 330 is located below the lower surface of the primary enclosure 340. Meanwhile, a secondary enclosure 341 is arranged on the lower surface of the primary enclosure 340, and the secondary enclosure 341 is located at the outer side of the boss 330 and is opposite to the second side 335 of the boss 330 at intervals to form a gas collecting channel 342 with a downward opening. The gas collecting channel 342 can collect the gas overflowing along the primary enclosure 340 and directly ejected from the ignition hole 312. In this embodiment, the boss 330 is located at the left side of the fire cover body 310, the secondary enclosure 341 is located at the left side of the boss 330, the secondary enclosure 341 extends along the front-rear direction, two ends of the secondary enclosure 341 in the extending direction are located at the front-rear sides of the boss 330, two ends of the secondary enclosure in the extending direction are bent (i.e. right-hand bent) towards the direction close to the fire cover body 310, and two ends of the secondary enclosure 341 in the extending direction are arranged at an included angle α of 0-180 °. As shown in fig. 10, in this embodiment, the included angle α may be any value between 0 ° and 180 °, for example, the included angle a may be 180 °, 60 °, 100 °, or the like. After the gas strikes the secondary enclosure 341, the gas on both sides bounces or gathers toward the center.

And the lower surface of the secondary enclosure 341 is located below the bottom surface 331 of the boss 330, and the space S1 between the two is 0.5-1.5 mm in the up-down direction. The lower surface of the secondary enclosure 341 is located above the lower edge of the ignition hole 312, and the space S2 between the lower surface and the lower surface is less than or equal to 1mm, so that the concentration of the fuel gas below the bottom surface of the boss 330 is ensured, and meanwhile, excessive fuel gas and flame aggregation are not caused below the bottom surface of the boss 330 for a long time, i.e. the space value is not too large. The space S3 between the lower surface of the secondary enclosure 341 and the top wall of the air collecting duct 342 in the vertical direction is 1 to 2mm. In this embodiment, S1 may be any value between 0.5 and 1.5mm, for example, S1 may be 0.5mm, 1.0mm, 1.5mm, or the like. S2 may be any value less than or equal to 1mm, for example S2 may be 1mm, 0.8mm, 0.5mm or 0.2mm, etc.

The secondary enclosure 341 mainly gathers the fuel gas overflowed from the primary enclosure 340 and the fuel gas directly injected from the ignition holes inside the secondary enclosure 341 and below the boss 330. In the utility model, the space between the lower surface of the secondary enclosure 341 and the top wall of the gas gathering groove 342 in the up-down direction is designed to be 1-2 mm, and the space between the lower surface of the secondary enclosure 341 and the bottom surface of the boss 330 in the up-down direction is designed to be 0.5-1.5 mm, so that the fuel gas amount below the bottom surface of the boss 330 is suitable for ignition and is not too much to gather.

The ignition needle 301 is a prior art, which is vertically disposed below the water blocking eave 321 of the cover 320, and the discharge end of the top of the ignition needle 301 is opposite to the bottom 331 of the boss 330. The thermocouple 302 is also conventional and is disposed vertically beside the fire protection hole 316 of the first fire cover body 310.

In use, part of the fuel gas ejected from the ignition holes 312 enters the bleed air channel 333 through the first end opening of the bleed air channel 333 and is output from the second end opening of the bleed air channel 333 to be gathered below the boss 330; part of the fuel gas ejected from the ignition hole 312 overflows to the gas gathering groove 342 along the first-stage enclosing block 340, part of the fuel gas directly collides from the lower part of the boss 330 to the second-stage enclosing block 341, the second-stage enclosing block 341 has a good blocking effect on the fuel gas, and the fuel gas can be returned to the lower part of the boss 330 through the gas gathering groove 342 after striking the second-stage enclosing block 341, so that more fuel gas can be gathered near the bottom surface of the boss 330, the ignition is suitable, and the ignition success rate is improved to a great extent.

In the description and claims of the present utility model, terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc., are used to describe various example structural parts and elements of the present utility model, but these terms are used herein for convenience of description only and are determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the utility model may be arranged in a variety of orientations, the directional terminology is used for purposes of illustration and is in no way limiting, such as "upper" and "lower" are not necessarily limited to being in a direction opposite or coincident with the direction of gravity.

The term "vertical" is also used in the present description and claims to mean substantially in the vertical direction, not limited to only the vertical direction, but also slightly inclined with respect to the vertical direction.

The term "radial" is also used in the present description and claims to mean substantially in an inward-outward direction, not limited to a radial direction only through the center of a circle, but also slightly offset from the radial direction.

Claims (15)

1. A combustion assembly comprising:

A burner (200) having an air inlet channel (201) extending up and down inside, wherein a second fire cover body (360) with a second fire outlet hole (361) is arranged at the upper port of the air inlet channel (201);

It is characterized in that the method also comprises the following steps:

The tubular nozzle body (110) is internally provided with a runner which extends up and down, the lower end of the runner is provided with a fuel gas inlet (110 a) for inputting a fuel gas source, the upper end of the runner is provided with a fuel gas outlet (110 b) and is inserted into the lower port of the air inlet channel (201), and the side wall of the runner, which is positioned between the upper end and the lower end, is provided with an air inlet (111) penetrating through the wall thickness so as to communicate the runner with the outside.

2. The combustion assembly of claim 1, wherein: the air inlet channel (201) of the burner (200) is provided with an upward extending air mixing section (201 a) and an upward extending pressure stabilizing section (201 b) positioned at the downstream of the air mixing section (201 a), wherein the flow area of the pressure stabilizing section (201 b) on the cross section is smaller than the flow area of the air mixing section (201 a) on the cross section along the flow direction of fuel gas.

3. The combustion assembly of claim 2, wherein: the gas outlet (110 b) of the nozzle body (110) is located upstream of the gas mixing section (201 a) of the gas inlet channel (201), and the flow area of the gas outlet (110 b) of the nozzle body (110) is smaller than the flow area of the gas mixing section (201 a) on the cross section.

4. A combustion assembly according to claim 3, wherein: the air mixing section (201 a) and the pressure stabilizing section (201 b) of the air inlet channel (201) are coaxially arranged.

5. The combustion assembly of claim 1, wherein: the second fire cover body (360) is provided with a top wall (362) and a ring wall (363) extending downwards from the periphery of the top wall (362), the ring wall (363) and the top wall (362) together form a second air mixing cavity (364) communicated with the air inlet channel (201), and the ring wall (363) is circumferentially provided with the second fire outlet hole (361) communicated with the second air mixing cavity (364) and the outside.

6. The combustion assembly of claim 1, wherein: at least part of the flow passage of the nozzle body (110) located at the downstream of the air inlet (111) is a diffuser section (115), the flow area on the cross section of the diffuser section (115) is gradually increased along the flow direction of the fuel gas, and the port of the diffuser section (115) is a fuel gas outlet (110 b) of the nozzle body (110).

7. The combustion assembly of claim 6, wherein: the small end of the diffusion section (115) is connected with the part where the air inlet (111) of the flow channel is located through a throat section (116), and the flow area on the cross section of the throat section (116) is unchanged along the flow direction of fuel gas and is consistent with the flow area of the small end of the diffusion section (115).

8. The combustion assembly of claim 6, wherein: at least a part of the flow passage upstream of the air inlet (111) is a constriction (112), and the flow area of the constriction (112) in cross section is gradually reduced along the flow direction of the fuel gas.

9. The combustion assembly of claim 8, wherein: the part of the flow channel, which is positioned at the downstream of the contraction section (112) and at the upstream of the air inlet (111), is an injection section (113), and the flow area of the injection section (113) on the cross section is unchanged along the flow direction of the fuel gas and is consistent with the flow area of the small end of the contraction section (112).

10. The combustion assembly of claim 9, wherein: the injection section (113) of the flow channel is connected with the part of the air inlet (111) of the flow channel through the expansion section (114), and the flow area of the expansion section (114) on the cross section is gradually increased along the flowing direction of the fuel gas.

11. The combustion assembly of claim 10, wherein: the length of the expansion section (114) is less than the length of the contraction section (112).

12. The combustion assembly of claim 1, wherein: at least two of the air inlets (111) are circumferentially arranged at a central position in the longitudinal direction of the nozzle body (110).

13. The combustion assembly of claim 1, wherein: the nozzle further comprises a retainer ring (120) which is sleeved on the periphery of the nozzle main body (110) along the circumferential direction and at least partially shields the air inlet (111), and the retainer ring (120) is arranged to move up and down under the action of external force and away from the air inlet (111), so that shielding of the air inlet (111) is reduced.

14. The combustion assembly of any one of claims 1-13, wherein: the combustor (200) is internally provided with an inner ring cavity (202) positioned at the periphery of the air inlet channel (201) along the circumferential direction, and a first fire outlet hole (313) communicated with the inner ring cavity (202) and the outside is formed in the circumferential direction on the outer circumferential wall of the inner ring cavity (202);

The burner is characterized by further comprising an inner ring injection pipe (400), wherein the inner ring injection pipe is transversely arranged at the bottom of the burner (200), the air outlet end of the inner ring injection pipe (400) is communicated with the inner ring cavity (202), and the air inlet end of the inner ring injection pipe (400) is positioned in the external environment and correspondingly provided with an inner ring nozzle (401).

15. The combustion assembly of any one of claims 1-13, wherein: the combustion assembly is used for a kitchen range.