A constant flame ignition burner

Abstract

The present invention belongs to the technical field of stoves, and specifically relates to a constantly open flame ignition burner. The present invention includes an air-fuel mixing tube and a combustion zone, an ignition needle for ignition is arranged beside the combustion zone, the combustion zone includes an ignition zone and a constant combustion zone for backup ignition function, the ignition zone and the constant combustion zone are connected to the air-fuel mixing tube through a branch pipeline; a mesh screen layer located on the gas flow path is arranged in the constant combustion zone, and the mesh screen layer is arranged adjacent to the fire outlet of the ignition zone. The present invention has the characteristics of ensuring easy ignition and stable combustion of the stove, and even in the closed combustion condition of the furnace, and when there is a high pressure in the furnace or the furnace pressure frequently rises and falls suddenly, it can ensure that the stove constantly open flame maintains a normal and stable combustion state, thereby providing a prerequisite for ensuring the waste heat utilization efficiency and the anti-empty burning function of the stove.

Description

Technical Field

[0001] The invention belongs to the technical field of stoves, and in particular relates to a constantly open flame ignition burner. Background Art

[0002] my country is a big country in catering, and there are more than 30 million stoves in the market. For gas boilers and commercial stoves, according to the corresponding national standards, they must be equipped with a constant flame ignition burner. Due to the complexity of the application scenarios, there are high technical requirements for the ignition and combustion stability of the constant flame ignition burner. Existing products on the market generally have shortcomings such as difficult ignition, instability, easy flashback or flame separation, and easy extinguishing; especially for closed combustion furnaces used in waste heat utilization stoves, the furnace pressure will change transiently during the instantaneous ignition or extinguishing of the main fire burner, which can easily cause the constant flame ignition burner to flash back or flame separation and cause it to extinguish. The ignition and combustion conditions of this type of burner are unstable, which will trigger the flameout protection of the equipment, thereby affecting the normal operation of the equipment and reducing the safety of the equipment. In order to improve the operating stability of the normally open flame ignition burner, traditional equipment often adopts the method of increasing the gas input thermal power. However, the disadvantage of this method is that it increases the gas energy consumption, is not energy-saving, and is prone to excessive CO emissions and black smoke from the equipment due to incomplete combustion, which is not environmentally friendly.

[0003] On the other hand, since the normally open flame ignition burner works in a high temperature environment of about 1000℃ for a long time, the metal sections of the ignition needle and flame detection needle will be more easily oxidized and brittle and then broken, and the ceramic section will also be more likely to crack or even break. In addition, when the stove stops running, the hot flue gas with high humidity retained in the furnace will condense on the ceramic part of the ceramic needle during the cooling process of the furnace, resulting in abnormal ignition and flame detection. This greatly increases the failure rate of stove equipment. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a normally open flame ignition burner which has a reasonable structure and is reliable and convenient to use; it has the characteristics of ensuring easy ignition of the stove and stable combustion, and even under the condition of closed furnace combustion, and when there is a high furnace pressure or frequent and sudden rise and fall of furnace pressure, it can ensure that the normally open flame of the stove maintains a normal and stable combustion state, thereby providing a prerequisite for ensuring the waste heat utilization efficiency of the stove and the anti-air burning function.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A constantly open flame ignition burner comprises an air-fuel mixing tube for achieving mixing of air and gas and a combustion zone arranged at the outlet end of the air-fuel mixing tube, an ignition needle for ignition being arranged beside the combustion zone, and is characterized in that: the combustion zone comprises an ignition zone for directly connecting to a main fire combustion chamber and a constant combustion zone for serving as a backup ignition function, the ignition zone and the constant combustion zone are both connected to the air-fuel mixing tube via a branch pipeline; a mesh screen layer is provided in the constant combustion zone on the path of gas flow, and the mesh screen layer is arranged adjacent to the fire outlet of the ignition zone.

[0007] Preferably, the combustion zone includes a combustion tube which is cylindrical or square tube-shaped and is coaxially arranged with the outlet end of the air-fuel mixing tube, and the inlet of the combustion tube and the outlet end of the air-fuel mixing tube are separated from each other by a partition; the combustion tube is divided into the ignition zone and the constant combustion zone, and the partition is penetrated by two groups of through holes, one group of through holes connects the air-fuel mixing tube and the ignition zone, and the other group of through holes connects the air-fuel mixing tube and the constant combustion zone.

[0008] Preferably, the burner also includes a porous honeycomb-shaped high-temperature resistant mesh material in the shape of the letter "L", and the porous honeycomb-shaped high-temperature resistant mesh material includes a transverse mesh as a horizontal plate to separate the ignition zone and the constant combustion zone, and a longitudinal mesh as a mesh screen layer to be vertically arranged on the airflow travel path; the transverse mesh, the longitudinal mesh and the tube cavity of the combustion tube cooperate to form a closed constant combustion zone in which the air-fuel mixture can burn in the tube cavity and / or the sieve holes.

[0009] Preferably, the high temperature resistant mesh material is an iron-chromium-aluminum wire mesh.

[0010] Preferably, a cooling air blowing component is arranged between the combustion zone and the ignition needle and the flame detection needle; the air flow from the fan outlet enters the inner cavity of the cavity section through the air inlet pipe, and an air outlet pipe with a blowing port on the side extends above the cavity section, and the blowing port points to the ceramic section of the ignition needle and the flame detection needle.

[0011] Preferably, there are two ignition needles and two flame detection needles, and the needle heads are symmetrically arranged at both sides of the outlet of the combustion zone with each other facing each other.

[0012] Preferably, the air-fuel mixing tube has an "L"-shaped tubular shape and is formed by a vertical pipe section and a horizontal pipe section connected end to end; the high-voltage ignition needle and the flame detection needle include a ceramic section and a needle head coaxially extending from the front end face of the ceramic section, and the high-voltage ignition needle discharges to the flame detection needle, and the ceramic sections of the two are parallel to each other and fixed together on the bracket; the needle heads of the high-voltage ignition needle and the flame detection needle first extend vertically upward from the ceramic section, and then bend in a horizontal relative direction, and the gap area formed in the middle is located at the gas flow path of the combustion zone.

[0013] Preferably, the vertical pipe section of the air-fuel mixing tube, the ceramic section of the ignition needle and the ceramic section of the flame detection needle all pass through the cavity section.

[0014] Preferably, an "L"-shaped radial socket adapted to the shape of the iron-chromium-aluminum wire mesh is arranged through the side wall of the combustion tube, so that the iron-chromium-aluminum wire mesh can be radially assembled into the combustion tube; the insertion end of the radial socket is arranged with a pin for limiting the radial movement of the iron-chromium-aluminum wire mesh, and the pin is fixed by plugging with a support ear fixed at the insertion end of the radial socket, so that the pin body of the pin blocks the radial movement path of the iron-chromium-aluminum wire mesh.

[0015] Preferably, the through hole connected to the constant combustion zone is an upper through hole, and the through hole connected to the ignition zone is a lower through hole, and the aperture of the upper through hole is larger than that of the lower through hole.

[0016] The beneficial effects of the present invention are:

[0017] 1) Abandoning the traditional single ignition structure, the present invention ingeniously provides a double insurance structure, that is, a spare ignition assembly with a mesh layer is arranged beside the single ignition, so as to always ensure that the stove is in a normal and stable burning state. In particular, the design of the mesh layer ensures that the flame in the constant combustion zone always forms a slow and constant internal flame in the mesh holes of the mesh layer and the cavity of the constant combustion zone. Its ability to resist the impact of sudden external pressure changes is obviously stronger than that of the "exposed" ignition zone, thus ensuring its constant combustion.

[0018] For ease of understanding, the flame in the constant combustion zone is defined as the "constant combustion fire", and the corresponding flame in the ignition zone is defined as the "ignition fire". The further explanation is as follows: When the equipment is started, the igniter will ignite the constant combustion fire and the ignition fire, and no matter which one is ignited first, the first ignited fire will also ignite the other fire instantly, so as to achieve the stable and reliable ignition of the constant flame ignition burner. After the constant combustion fire is ignited, the constant combustion fire in a stable internal flame / flashback combustion state is not easily extinguished by the transient change of external pressure due to the blocking effect of the mesh screen layer. When the main fire burner is ignited and extinguished instantly, causing the furnace pressure to increase and decrease sharply, the ignition fire will be extinguished due to flashback and flame separation. In this case, the ignition fire will still be instantly re-ignited by the stable burning constant combustion fire. Since the above process occurs in an instantaneous automatic switch in the combustion zone, it will not affect the detection of the constant flame by the rear-end flame detection device, and naturally will not trigger the flameout protection device to ensure the normal operation of the equipment.

[0019] In summary, it can be clearly seen that the present invention has the characteristics of ensuring easy ignition of the stove and stable combustion of the flame in the furnace. Even in the closed combustion condition of the furnace, and when there is a high pressure in the furnace or the pressure in the furnace rises and falls frequently and suddenly, the constant burning fire and the ignition fire can be coordinated with each other to ensure that the stove is always open and maintains a normal and stable combustion state, with remarkable results.

[0020] 2) More specifically, the combustion zone can be directly integrated on the air-fuel mixing tube, and the air-fuel mixed gas diversion effect can be achieved through the through hole at the partition. The air-fuel mixed gas divided into two enters the constant combustion zone and the ignition zone located in the tube cavity of the combustion tube respectively, and finally achieves the established purpose of the present invention; due to the above-mentioned constant combustion zone and ignition zone, as well as the integration of the combustion zone and the air-fuel mixing tube, the overall structure is extremely compact and reasonable, the volume is also more compact and easy to install, and the use is extremely flexible.

[0021] 3) In actual use, the constant combustion zone and the ignition zone can also be separated from each other by a certain distance. They only need to be close to each other when working to achieve mutual ignition. They do not necessarily have to be side by side. Furthermore, the constant combustion zone and the ignition zone of the present invention are actually arranged side by side, thus forming a proximity relationship. At this time, the porous honeycomb-shaped high-temperature resistant mesh material constitutes a longitudinal partition plate structure, thereby dividing the tube cavity of the combustion tube into an upper constant combustion zone and a lower ignition zone. Of course, the positions of each other can also be interchanged. At the same time, the sieve hole structure of the porous honeycomb-shaped high-temperature resistant mesh material itself also provides a space for the air-fuel mixture to reside, so that the purpose of slow and stable combustion of the inner flame formed by the tiny flame in the sieve hole and the constant combustion zone cavity is achieved, achieving multiple goals at one stroke.

[0022] 4) As for the iron-chromium-aluminum wire mesh, it can be arranged in an integrated manner in the combustion tube cavity, or inserted into the combustion tube cavity by the radial plug-in method described in the present invention. When a plug-in structure is adopted, it can be considered to prevent the iron-chromium-aluminum wire mesh from accidentally falling out of the radial socket by means of a pin positioning method.

[0023] 5) The aperture of the upper through hole is larger than that of the lower through hole because the dense mesh of the porous honeycomb-shaped high-temperature resistant mesh material will have a certain gas resistance, resulting in a higher pressure in the constant combustion zone than in the ignition zone. Therefore, it is necessary to increase its diameter to ensure the stability of the constant combustion zone and continuous internal flame combustion.

[0024] 6) Since the ignition burner is in a high temperature environment for a long time, a large amount of heat comes from the burning of the flame ejected by the ignition burner itself, the radiation heat of the main burner flame, and the convection heat of the high-temperature flue gas in the furnace. In this case, although the ceramics at the bottom of the ignition needle and the flame detection needle are high-temperature resistant insulation materials, their service life is also greatly affected. To this end, the present invention is designed to cool down the ceramic sections of the ignition needle and the flame detection needle by blowing the low-temperature air with a certain pressure from the outlet of the fan through convection from the inside of the cavity section and from the upper part of the cavity section through the blowing port, so as to achieve the purpose of extending its service life and improving the reliability of the ignition and flameout protection functions of the stove equipment. In addition, after the equipment stops running, the flue gas with high humidity retained in the furnace will condense on the ceramic sections of the ignition needle and the flame detection needle during the cooling process of the furnace, which will cause abnormal ignition and flame detection, and then cause unsuccessful ignition and malfunction of flameout protection. The air blowing design of the ceramic segment of the present invention can effectively remove condensed water from the ceramic segment, thereby greatly improving the ignition success rate and avoiding malfunction of flameout protection caused by moisture on the flame ion detection needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an assembly diagram of the present invention;

[0026] Figure 2 for Figure 1 A partial enlarged view of part I;

[0027] Figure 3 A front view of a combustion zone of one embodiment of an iron-chromium-aluminum wire mesh;

[0028] Figure 4 is a front view of the partition;

[0029] Figure 5 for Figure 3 The three-dimensional structural schematic diagram of the iron-chromium-aluminum wire mesh shown;

[0030] Figure 6 It is a three-dimensional structural schematic diagram of another embodiment of the iron-chromium-aluminum wire mesh;

[0031] Figure 7 In the top-down state, Figure 1 The relative arrangement position diagram of the air-fuel mixing tube and the ignition needle is shown;

[0032] Figure 8 It is a cross-sectional view of the air outlet duct when viewed from above.

[0033] The actual correspondence between the reference numerals and component names of the present invention is as follows:

[0034] 10-Air-fuel mixing tube

[0035] 20-combustion zone 20a-ignition zone 20b-constant combustion zone

[0036] 21-combustion tube 21a-radial socket 21b-pin 21c-support ear

[0037] 22- partition 22a- upper through hole 22b- lower through hole 23- iron chromium aluminum wire mesh

[0038] 30- ignition needle 40- bracket 50- flame detection needle 60- cooling and blowing parts

[0039] 61-air inlet pipe 62-cavity section 63-air outlet pipe 63a-air outlet DETAILED DESCRIPTION

[0040] For ease of understanding, here we combine Figure 1-8 The specific structure and working mode of the present invention are further described as follows:

[0041] The specific implementation structure of the present invention refers to Figure 1 As shown, it includes a bracket 40 , an air-fuel mixing tube 10 , an ignition needle 30 , and a flame detection needle 50 assembled on the bracket 40 . Figure 1 The right side of the ignition needle 30 is a burner or a main fire burner. The main fire burner can be ignited by the flame in the constant flame combustion chamber formed by the present invention.

[0042] In the specific design, the vertical pipe section of the air-fuel mixing tube 10 of the present invention forms a matching relationship with the bracket 40, and the horizontal pipe section of the air-fuel mixing tube 10 directly arranges the partition 22 and the combustion tube 21 coaxially in sequence, and at this time, the partition 22 and the combustion tube 21 are combined to form the combustion zone 20 of the present invention. As for the combustion tube 21, it is a straight cylindrical or square tube structure, and a Figure 2-3 The "L"-shaped radial socket 21a shown in the figure can be used as Figure 5 or Figure 6 The porous honeycomb-shaped high temperature resistant mesh material shown is also an iron-chromium-aluminum wire mesh 23 inserted, and then used as Figure 3 The matching structure of the lug 21c and the latch 21b shown is used to lock the porous honeycomb-shaped high-temperature resistant mesh material, thereby ensuring the formation of the constant combustion zone 20b. The latch 21b can be Figure 3 The soft pin body shown can also adopt a conventional bolt body structure.

[0043] Furthermore, when the present invention is actually working, it is divided into: gas feed pipe, main air inlet pipe, air-fuel mixing pipe 10 and combustion zone 20 according to the flow direction of the air flow. Manual regulating valves are respectively provided at the gas feed pipe and the main air inlet pipe to adjust the intake volume and air intake volume respectively. A high-temperature resistant metal partition 22 is provided between the air-fuel mixing pipe 10 and the combustion zone 20, and the partition 22 is provided with two small through holes. One of the through holes, namely the upper through hole 22a, leads to a closed space with a certain thickness and porous surrounded by a high-temperature resistant mesh material; the high-temperature resistant mesh material is preferably an iron-chromium-aluminum wire mesh 23, and the closed space is defined as a constant combustion zone 20b, and the flame generated is a constant combustion fire. The gas mixed with air enters the ignition zone 20a through another through hole, namely the lower through hole 22b, and blows directly to the main fire burner, with the flame in the ignition zone 20a as the ignition fire. When the equipment is started, the igniter will ignite the constant-burning fire and the ignition fire, and no matter which one is ignited first, the first ignited fire will instantly ignite the other fire, so that the constant-burning ignition burner can be stably and reliably ignited. After the constant-burning fire is ignited, the gas and air feed rates are adjusted to ensure that the constant-burning fire burns in the closed space in the form of backfire or inner flame. The constant-burning fire in a stable backfire combustion state is not easily extinguished by transient changes in external pressure, so that when the main fire burner is instantly ignited and extinguished, causing the furnace pressure to increase and decrease sharply, the ignition fire will be extinguished due to backfire and flame separation. In this case, the ignition fire will still be instantly re-ignited by the stable constant-burning fire. . Since the above process occurs in an instantaneous automatic switch within the combustion zone 20, it will not affect the detection of the constant flame by the rear-end flame detection device, and thus will not trigger the flameout protection device to ensure the normal operation of the equipment.

[0044] In specific operation, it should be noted that the aperture of the upper through hole 22a is larger than that of the lower through hole 22b. This is because the dense mesh of the porous honeycomb-shaped high-temperature resistant mesh material will have a certain gas resistance, which will cause the pressure in the constant combustion zone to be higher than that in the ignition zone. Therefore, its diameter needs to be increased to ensure the stability and continuous internal flame combustion in the constant combustion zone. As for the ignition needle 30 and the flame detection needle 50, they can be arranged in one group or as Figure 7 The arrangement shown is two groups, and even more groups can be arranged, as long as the predetermined ignition function can be achieved. The ignition needle 30 and the flame detection needle 50 are also fixed on the bracket 40, and the needles of the ignition needle 30 and the flame detection needle 50 are relatively pointed, and the middle arc gap area is in the direction of the gas flow path of the air-fuel mixer in the combustion area 20, so as to facilitate ignition at any time. If necessary, corresponding electronic probes and other structures can also be used to achieve the electronic and automatic monitoring purpose of the present invention, which will not be described in detail here.

[0045] Since the ignition needle 30 and the flame detection needle 50 are in a high-temperature working state all year round; when the power is turned off, the high-temperature area of ​​the traditional structure, especially the high-temperature ceramic section, will quickly cool down and condense when it is cold, which often results in failure to ignite or poor ignition the next time it is used. The present invention has a design that cools, dries, and prevents condensation for the ignition needle 30 and the flame detection needle 50 that work in the high-temperature zone for a long time, thereby effectively ensuring the working reliability of the ignition needle 30 and the flame detection needle 50, and extending the working life of the ignition needle 30 and the flame detection needle 50, greatly improving the stability of the electronic high-voltage ignition and flameout protection functions. More specifically: refer to Figure 1-2 and Figure 8 As shown, the present invention arranges a cooling air blowing component 60 between the combustion zone 20 and the ignition needle 30 and the flame detection needle 50. The low-temperature and pressured air from the blower outlet enters the cavity section 62 of the constant-fire ignition burner through the air inlet pipe 61. An opening is provided above the cavity section 62, and the opening is connected to an air outlet pipe 63 with a closed end. The air outlet pipe 63 is provided with an air blowing port 63a facing the ceramic section of the ignition needle 30 and the flame detection needle 50. This design can effectively reduce the working temperature of the ceramic section and the metal section at the ignition needle 30 and the flame detection needle 50, effectively prevent condensation on the ceramic section, greatly improve its service life, and effectively improve the reliability of the ignition and flameout protection functions. In addition, since the body of the air-fuel mixing tube 10, the ceramic section of the ignition needle 30, and the ceramic section of the flame detection needle 50 all penetrate the cavity section, the ignition needle 30, the flame detection needle 50, and even the air-fuel mixing tube 10 achieve a three-stage cooling effect from top to bottom, that is: the body of the air-fuel mixing tube 10, the ceramic section of the ignition needle 30, and the ceramic section of the flame detection needle 50 exposed above the cavity section 62 have the highest cooling efficiency, the part located in the cavity section 62 is initially cooled by the cold air flowing into the air inlet pipe 61, and the exposed part of the air-fuel mixing tube 10, the ceramic section of the ignition needle 30, and the ceramic section of the flame detection needle 50 located below the cavity section 62 is exposed to room temperature and can be cooled naturally. Due to the three-stage cooling feature, the normally open flame ignition burner of the present invention can always be in a high-reliability working state.

[0046] Thus, the present invention realizes the ignition and stable combustion of the constantly open flame ignition burner under extremely low power consumption through scientific structural design, and at the same time has the characteristics of energy saving, low cost, high reliability and long service life, which is conducive to practical application.

[0047] Of course, it will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0048] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0049] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A constantly open flame ignition burner, comprising an air-fuel mixing tube (10) for mixing air and gas, and a combustion zone (20) arranged at the outlet end of the air-fuel mixing tube (10), an ignition needle (30) for ignition arranged beside the combustion zone (20), characterized in that: The combustion zone (20) comprises an ignition zone (20a) for directly connecting to the main fire combustion chamber and a constant combustion zone (20b) for serving as a backup ignition function, wherein the ignition zone (20a) and the constant combustion zone (20b) are both connected to the air-fuel mixing pipe (10) via a branch pipeline; a mesh screen layer is provided in the constant combustion zone (20b) and is located on the airflow path, and the mesh screen layer is arranged adjacent to the fire outlet of the ignition zone (20a); The combustion zone (20) comprises a combustion tube (21) which is cylindrical or square-tube in shape and is coaxially arranged with the outlet end of the air-fuel mixing tube (10); the inlet of the combustion tube (21) and the outlet end of the air-fuel mixing tube (10) are separated from each other by a partition (22); the combustion tube (21) is divided into the ignition zone (20a) and the constant combustion zone (20b); the partition (22) is provided with two groups of through holes, one group of through holes connects the air-fuel mixing tube (10) and the ignition zone (20a), and the other group of through holes connects the air-fuel mixing tube (10) and the constant combustion zone (20b); The burner also includes a porous honeycomb-shaped high-temperature resistant mesh sheet material in the shape of the letter "L", wherein the porous honeycomb-shaped high-temperature resistant mesh sheet material includes a transverse mesh as a horizontal plate to separate the ignition zone (20a) from the constant combustion zone (20b) and a longitudinal mesh as a mesh screen layer to be vertically arranged on the gas flow path; the transverse mesh, the longitudinal mesh and the tube cavity of the combustion tube (21) cooperate to form a closed constant combustion zone (20b) in which the air-fuel mixture can be burned in the tube cavity and / or the mesh holes; The through hole connected to the constant combustion zone (20b) is an upper through hole (22a), and the through hole connected to the ignition zone (20a) is a lower through hole (22b). The diameter of the upper through hole (22a) is larger than that of the lower through hole (22b).

2. A constant flame ignition burner according to claim 1, characterized in that: The high temperature resistant mesh sheet material is an iron-chromium-aluminum wire mesh (23).

3. A constant flame ignition burner according to claim 1 or 2, characterized in that: A cooling air blowing component (60) is arranged between the combustion zone (20) and the ignition needle (30) and the flame detection needle (50); the air flow from the fan outlet enters the inner cavity of the cavity section (62) through the air inlet pipe (61); an air outlet pipe (63) with a blowing port (63a) on the side extends above the cavity section (62), and the blowing port points to the ceramic section of the ignition needle (30) and the flame detection needle (50).

4. A constantly open flame ignition burner according to claim 3, characterized in that: The ignition needle (30) and the flame detection needle (50) are two in number and are symmetrically arranged at both sides of the outlet of the combustion zone (20) with their needle heads facing each other.

5. A constantly open flame ignition burner according to claim 4, characterized in that: The air-fuel mixing tube (10) is in an "L"-shaped tubular shape and is formed by a vertical tube section and a horizontal tube section connected end to end; the high-voltage ignition needle (30) and the flame detection needle (50) include a ceramic section and a needle head coaxially extending from the front end surface of the ceramic section; the high-voltage ignition needle (30) discharges to the flame detection needle (50), and the ceramic sections of the two are parallel to each other and fixed together on the bracket (40); the needle heads of the high-voltage ignition needle (30) and the flame detection needle (50) first extend vertically upward from the ceramic section and then bend in a horizontal relative direction, and the gap area formed in the middle is located at the gas flow path of the combustion zone (20).

6. A constantly open flame ignition burner according to claim 5, characterized in that: The vertical pipe section of the air-fuel mixing tube (10), the ceramic section of the ignition needle (30) and the ceramic section of the flame detection needle (50) all penetrate the cavity section (62).

7. A constant flame ignition burner according to claim 2, characterized in that: An L-shaped radial socket (21a) matching the outer shape of the iron-chromium-aluminum wire mesh (23) is arranged through the side wall of the combustion tube (21) so that the iron-chromium-aluminum wire mesh (23) can be radially assembled into the combustion tube (21) along the combustion tube (21); a plug (21b) for limiting the radial movement of the iron-chromium-aluminum wire mesh (23) is arranged at the insertion end of the radial socket (21a); ​​the plug (21b) is plugged and fixed by a support ear (21c) fixed at the insertion end of the radial socket (21a), so that the pin body of the plug (21b) blocks the radial movement path of the iron-chromium-aluminum wire mesh (23).

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