Spark plug for inflammable gas generator and pre-mixing type igniter

Abstract

The invention discloses a spark plug and a pre-mixing type igniter for an inflammable gas generator. The present invention relates to a pilot burner for generating heat by combusting a main mixed gas, comprising: a main mixed gas delivery pipe formed to a prescribed length for delivering the main mixed gas to the inside; and a spark plug assembly in which a mixed pilot gas delivery pipe, a spark plug, and a gas-air mixer are combined, the gas-air mixer including a mixer body, a mixed pilot gas movement path, a gas inlet, a gas guide frame, and an air inlet. The speed at which the air flows in from the air inlet is greater than the speed at which the gas flows in from the gas inlet, and the air flowing in from the mixed pilot gas moving path is mixed with the gas at a ratio of 10: 1.

Description

Technical Field

[0001] The present invention relates to an igniter for an inflammable gas (Ex-Gas) generator, and more particularly, to an igniter for an inflammable gas (Ex-Gas) generator that stably achieves ignition by improving a mixed state of air and gas. Background Art

[0002] When liquefied natural gas (LNG, CH4), liquefied petroleum gas (LPG, C3H8), butane (C4H 10 ) and other flammable gases (GAS) are properly mixed (MIXING) with air (AIR) and burned, which will generate heat and combustion gas. Among them, if the purpose is to use the generated heat, it is called a heating burner (usually a burner), and if the purpose is to use the combustion gas, it is called an environmental gas generator (usually a gas generator). Environmental gas generators can also be divided into flammable gas (Ex-Gas) generators and natural gas gas (EN-GAS) generators.

[0003] On the other hand, when heat treating at high temperature, metals, non-metals, etc. are oxidized by combining with air. In this case, in order to prevent the heat-treated object from being oxidized, flammable gas (Ex-Gas) is introduced into the internal space of the heat treatment furnace to completely exhaust the air inside the heat treatment furnace through the exhaust port. The inside of the heat treatment furnace replaced with flammable gas (Ex-Gas) is generally considered to form ambient gas (GAS).

[0004] Figure 1 The sectional view shows the structure of a conventional igniter 50 for an ex-gas generator. The conventional igniter 50 is a device that uses gas as an energy source and utilizes the heat (indirect heat) generated when the gas is burned. The igniter 50 generates high-temperature heat by burning the main mixed gas with the main burner 10 as an ignition device. In the main burner 10, the generated heat is injected into the combustion tube 40 and discharged.

[0005] The main burner 10 is connected to the combustion tube 40, and a main nozzle 20 and a refractory brick 30 are arranged around the main burner 10 and the combustion tube 40. The main burner 10 includes: a main mixed gas delivery pipe 16; a mixed pilot gas delivery pipe 14 passing through the interior of the main mixed gas delivery pipe 16; and a spark plug 12 passing through the interior of the mixed pilot gas delivery pipe 14.

[0006] Figure 2 FIG. 2 is an exploded perspective view showing the exploded structure of the main burner 10. Figure 2 As shown, the main mixed gas supplied through the main mixed gas injection port (not shown) spirally passes through the main mixed gas delivery pipe 16.

[0007] The combustion of the main mixed gas is used to generate heat and combustion gas, and the mixed pilot gas is used to ignite the spark plug assembly 200. The main mixed gas and the mixed pilot gas both refer to gases mixed with air and gas.

[0008] like Figure 1 As shown in enlarged form, the tip end portion of the spark plug 12 is exposed to the outside in a portion that discharges the mixed pilot gas delivered along the mixed pilot gas delivery pipe 14. In the main burner 10, the portion that discharges the mixed pilot gas is formed in such a manner that the inner surface gradually narrows.

[0009] In order to burn the main mixture gas by the main burner 10, first, the mixture pilot gas is supplied to the mixture pilot gas delivery pipe 14 and electric power is supplied to the spark plug 12 to ignite the mixture pilot gas. Then, when the mixture pilot gas is ignited, the main mixture gas discharged through the main mixture gas delivery pipe 16 is combusted by the generated spark. When the main mixture gas is combusted, the generated heat and combustion gas (GAS) are discharged to the outside through the combustion pipe 40.

[0010] When the main mixture gas burns, the heat generated is very high in temperature, and therefore, the main mixture gas delivery pipe 16, the mixed pilot gas delivery pipe 14, and the spark plug 12, which are the parts that discharge the main mixture gas and burn, are severely damaged by the heat.

[0011] In the conventional main burner 10, the main mixed gas delivery pipe 16, the mixed pilot gas delivery pipe 14, the spark plug 12 and the mixed pilot gas supply unit 11 are separate components, which are assembled for use. Therefore, after the components damaged by heat are disassembled, they need to be replaced separately, which is not only difficult to separate and replace, but also has the disadvantage of consuming a lot of cost.

[0012] Furthermore, in the conventional main burner 10, the mixed pilot gas discharged through the mixed pilot gas delivery pipe 14 is a mixed pilot gas obtained by mixing air and gas through the mixed pilot gas supply unit 11. However, in the conventional mixed pilot gas supply unit 11, there is a problem that the flame generated by the spark plug 12 is unstable due to an insufficient mixing state of air and gas.

[0013] Furthermore, in the case of unstable flame, when the main burner 10 ignites the flame, ignition failure will frequently occur, thus causing the inconvenience of requiring multiple restarts. Summary of the invention

[0014] In order to solve the above problems, an object of the present invention is to provide a gas-air mixer having a mixing type so as to improve the mixing degree of gas and air.

[0015] Another object of the present invention is to provide an igniter that is easy to replace and separate by forming an integrated cartridge-type spark plug assembly.

[0016] Another object of the present invention is to provide an igniter that can prevent flashback by forming a flashback prevention insulator inside a spark plug assembly.

[0017] Those skilled in the art will further clearly understand the above-mentioned objectives and various advantages of the present invention through the preferred embodiments of the present invention.

[0018] In order to achieve the above-mentioned purpose, the igniter of the present invention generates heat by burning the main mixed gas. Preferably, the igniter of the present invention is characterized in that it includes: a main mixed gas delivery pipe 100 formed into a specified length for delivering the main mixed gas to the inside; and a spark plug assembly 200, which is composed of a mixed pilot gas delivery pipe 220, a spark plug 210 and a gas-air mixer 230. The mixed pilot gas delivery pipe 220 is accommodated in the main mixed gas delivery pipe 100 and is used to deliver the mixed pilot gas. The spark plug 210 is accommodated in the mixed pilot gas delivery pipe 220. The gas-air mixer 230 The gas-air mixer 230 connects one end of the spark plug 210 to the mixed pilot gas delivery pipe 220, and is used to supply a mixed pilot gas formed by mixing air and gas to the mixed pilot gas delivery pipe 220. The gas-air mixer 230 includes: a mixer body 231, which is formed with a plug insertion path 233 for the spark plug 210 to be inserted through in a horizontal direction; a mixed pilot gas moving path 239, which is vertically formed in the plug insertion path 233 to communicate with the plug insertion path 239 in the mixer body 231. The path 233 is connected, so that the mixed pilot gas formed by the mixture of air and gas is supplied to the mixed pilot gas delivery pipe 220 through the plug insertion path 233; the gas inlet 236 is formed on the outer peripheral surface of the mixer body 231 along the coaxial direction of the mixed pilot gas moving path 239 and allows the gas to flow in; the gas guide frame 238 is arranged between the gas inlet 236 and the mixed pilot gas moving path 239, forming a gas inlet 236 and the mixed pilot gas moving path 239 is connected to a gas movement path 238a to guide the movement of the gas G; and an air inlet 234 is formed through the front of the mixer body 231 toward the gas guide frame 238, and is used to guide the air A to move to the mixed pilot gas movement path 239 after hitting the gas guide frame 238. The speed of air flowing into the air inlet 234 is greater than the speed of gas flowing into the gas inlet 236. The air flowing into the mixed pilot gas movement path 239 is mixed with the gas in a ratio of 10:1.

[0019] According to one embodiment of the present invention, in the mixed pilot gas delivery pipe 220 , a plurality of support insulators 240 are formed at prescribed intervals along the length direction, and in the mixed pilot gas delivery pipe 220 , an anti-flashback insulator 250 is formed in the area connected to the main mixed gas delivery pipe 100 .

[0020] The igniter of the present invention comprises a spark plug assembly which is assembled into one body by a spark plug, a mixed pilot gas delivery pipe and a gas-air mixer. Therefore, when a specific part is damaged due to high temperature, only the entire spark plug assembly needs to be replaced, thus having the advantage of reducing the time and manpower required for replacement and disassembly.

[0021] Furthermore, the igniter of the present invention uses Bernoulli's theorem to achieve mixing of gas and air for mixing pilot gas based on the speed difference between air and gas, and therefore has the advantage of being able to achieve stable ignition based on a constant mixing ratio.

[0022] Furthermore, a flashback preventing insulator is formed at the end of the spark plug, thereby having the advantage of preventing flame flashback. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The following is a cross-sectional diagram showing the structure of a conventional igniter.

[0024] Figure 2 The figure is an exploded perspective view showing the exploded structure of a conventional main burner.

[0025] Figure 3 A cross-sectional illustration showing the structure of the igniter of the present invention.

[0026] Figure 4 It is a cross-sectional illustration showing the structure of a spark plug assembly of an igniter according to the present invention.

[0027] Figure 5 It is an exploded perspective view showing the exploded structure of the gas-air mixer of the spark plug assembly of the present invention.

[0028] Figure 6 The figure is a cross-sectional diagram showing the cross-sectional structure of the gas-air mixer.

[0029] Description of Reference Numerals

[0030] 1: Pilot burner 100: Main mixed gas delivery pipe

[0031] 200: Spark plug assembly 210: Spark plug

[0032] 211: Plug 211a: Mixer insertion end

[0033] 213: The other end of the plug 220: Mixed pilot gas delivery pipe

[0034] 230: Gas-air mixer 231: Mixer body

[0035] 233: plug insertion path 233a: first joint

[0036] 233b: Second joint 234: Air inlet

[0037] 234a: first air flow path 234b: second air flow path

[0038] 235: Air inlet connector 236: Gas inlet

[0039] 237: Gas inflow joint 238: Gas guide frame

[0040] 238a: Gas movement path 238b: Air movement cut-off flange

[0041] 239: Mixed pilot gas movement path 240: Support insulator

[0042] 250: Anti-flashback insulator DETAILED DESCRIPTION

[0043] With reference to the accompanying drawings, preferred embodiments of the present invention will be described to fully understand the present invention. The embodiments of the present invention may be implemented by various embodiments, and the scope of the present invention should not be interpreted as being limited to the embodiments described in detail below. This embodiment is used for a person of ordinary skill in the technical field to which the present invention belongs to fully understand the present invention. Therefore, in order to emphasize a clearer description, the shapes of the various elements shown in the accompanying drawings may be enlarged and shown. It should be noted that in each of the accompanying drawings, the same reference numerals represent the same components. When it is determined that the detailed description of the known functions and structures may confuse the subject matter of the present invention, the detailed description thereof will be omitted.

[0044] Figure 3 The present invention is a cross-sectional illustration for briefly showing the cross-sectional structure of the igniter 1 of the present invention.

[0045] The igniter 1 of the present invention is used for an inflammable gas (Ex-gas) generator. The igniter 1 of the present invention comprises: a main mixed gas delivery pipe 100 for delivering a pilot gas G required for combustion; and a spark plug assembly 200 in a box form for igniting the mixed pilot gas in order to burn the main mixed gas.

[0046] The main mixed gas delivery pipe 100 is formed to a predetermined length, receives the main mixed gas from a main mixed gas injection port (not shown) and supplies the main mixed gas to the combustion pipe 40 ( Figure 1The pilot gas G supplied to the main mixed gas delivery pipe 100 moves toward the burner pipe 40 along the spiral groove formed on the inner wall surface of the main mixed gas delivery pipe 100 .

[0047] The pilot gas G delivered through the main mixed gas delivery pipe 100 and the mixed pilot gas G1 delivered to the mixed pilot gas delivery pipe 220 are both mixed gases of air and gas. They are divided into pilot gas G and mixed pilot gas G1 due to different supply paths and uses.

[0048] Figure 4 FIG. 2 is a cross-sectional view showing the structure of a spark plug assembly 200 of the present invention. Figure 5 FIG. 2 is an exploded perspective view showing the exploded structure of the gas-air mixer 230 of the spark plug assembly 200. Figure 6 2 is a cross-sectional diagram showing a cross-sectional structure of the gas-air mixer 230 .

[0049] The spark plug assembly 200 ignites the mixed pilot gas G1 and forms a spark to burn the pilot gas G supplied through the main mixed gas delivery pipe 100. When the pilot gas G is continuously supplied to the spark formed by the ignition, the pilot gas G burns in the combustion pipe 40 and generates heat.

[0050] like Figure 4 As shown, the spark plug assembly 200 includes: a spark plug 210; a mixed pilot gas delivery pipe 220, which moves the mixed pilot gas G1; and a gas-air mixer 230, which is combined with the spark plug 210 and the mixed pilot gas delivery pipe 220, and supplies the mixed pilot gas G1 mixed by the gas G and the air A to the mixed pilot gas delivery pipe 220.

[0051] In the spark plug assembly 200 of the present invention, the spark plug 210 and the mixed pilot gas delivery pipe 220 are combined at both ends of the gas-air mixer 230 and the spark plug assembly 200 is configured as a whole. Figure 2 As shown, compared with the prior art in which the spark plug 210 and the mixed pilot gas delivery pipe 220 are separately separated, the present invention has the advantage of making the disassembly and replacement of the main mixed gas delivery pipe 100 easier.

[0052] The spark plug 210 is in a columnar shape with a predetermined length, and a plug head 211 formed at one end of the spark plug 210 is disposed outside one side of the gas-air mixer 230, and the remaining area passes through the inside of the gas-air mixer 230 and is accommodated inside the mixed pilot gas delivery pipe 220. The other end 213 of the spark plug 210 generates a spark by receiving power from the plug head 211, thereby igniting the mixed pilot gas G1.

[0053] The other end of the spark plug 210 is housed in the mixed pilot gas delivery pipe 220 at a predetermined distance therefrom. To this end, a plurality of support insulators 240 are formed in the mixed pilot gas delivery pipe 220 .

[0054] like Figure 4 As shown in the enlarged view, the support insulator 240 radially protrudes from the outer peripheral edge of the spark plug 210 and supports the spark plug 210 and the inner wall surface of the mixed pilot gas delivery pipe 220, so that the spark plug 210 is configured to be arranged at a gap in the central area of ​​the mixed pilot gas delivery pipe 220. In this way, the gap between the mixed pilot gas delivery pipe 220 and the spark plug 210 can be constantly maintained and the ignition of the mixed pilot gas can be stably achieved.

[0055] like Figure 5 As shown, a mixer insertion end 211a having threads formed on the outer periphery is provided at the rear of the plug head 211 of the spark plug 210, and is threadedly engaged with the first engaging opening 233a of the mixer body 231. In this case, the spark plug 210 extending along the length direction inside the plug head 211 is inserted into the interior of the mixed pilot gas delivery pipe 220 through the interior of the mixer body 231.

[0056] The mixed pilot gas delivery pipe 220 moves the mixed pilot gas G1 received from the gas-air mixer 230 so that the mixed pilot gas G1 is ignited by the spark plug 210. Figure 4 and Figure 5 As shown, the front end of the mixed pilot gas delivery pipe 220 is inserted into the second connection port 233b of the gas-air mixer 230 and fixed to the gas-air mixer 230. The spark plug 210 is accommodated inside the mixed pilot gas delivery pipe 220 along the length direction.

[0057] The gas-air mixer 230 achieves stable ignition by sucking in gas at a constant ratio based on the speed difference of air movement and adjusting the mixing ratio of gas and air. Figure 5 As shown, the gas-air mixer 230 of the present invention includes: a mixer body 231; and a gas guide frame 238, which is accommodated inside the mixer body 231 and is used to adjust the movement path of the air A and adjust the intake amount of the gas G.

[0058] The mixer body 231 is in the shape of a hexahedral block. The mixer body 231 includes: a plug insertion path 233 formed through the mixer body 231 in the horizontal direction; a gas inlet 236 formed through the mixer body 231 in a manner perpendicular to the plug insertion path 233 and allowing gas G to flow in; and an air inlet 234 formed through the mixer body 231 in a manner perpendicular to the plug insertion path 233 and allowing air A to flow in.

[0059] Figure 6 Part (a) is a cross-sectional view showing the front cross-sectional structure of the gas-air mixer 230, Figure 6 Part (b) is a cross-sectional view showing a side cross-sectional structure of the gas-air mixer 230 .

[0060] like Figure 6 As shown in part (a) of FIG. 2 , a plug insertion path 233 and a gas inlet 236 are formed in the mixer body 231. In this case, a gas guide frame 238 is formed in the gas inlet 236, and the gas guide frame 238 and the plug insertion path 233 are connected by a mixed pilot gas moving path 239, and the whole is formed into a "T" shape.

[0061] like Figure 5 As shown, the gas inlet 236 is combined with a gas inlet joint 237 and connected to a gas supply pipe (not shown), and the air inlet 234 is combined with an air inlet joint 235 and connected to an air inlet pipe (not shown).

[0062] The gas supply pipe (not shown) is connected to the gas storage tank (not shown), and the air inlet pipe (not shown) is connected to the compressor or the fan, so that the external air flows into the air inlet 234 due to high pressure.

[0063] like Figure 6 As shown in part (b) of the figure, the air inlet 234 is connected to the first air moving path 234a, and the inner diameter R2 of the first air moving path 234a gradually narrows on the inner side at a predetermined distance from the inlet. The inner diameter R2 of the first air moving path 234a is smaller than the inner diameter R1 of the air inlet 234. Therefore, the air A flowing in from the air inlet 234 passes through the first air moving path 234a and accelerates the moving speed.

[0064] The air A moving along the first air path 234a hits the gas guide frame 238, and its path is changed to the mixed pilot gas path 239. A narrow second air path 234b is formed between the first air path 234a and the air flow blocking flange 238b of the gas guide frame 238.

[0065] The second air movement path 234b is a narrow passage between the inner wall surface of the mixer body 231 and the air movement blocking flange 238b of the gas guide frame 238. Since the movement speed of the air A along the second air movement path 234b is proportional to the area, the speed becomes faster.

[0066] In the gas-air mixer 230 of the present invention, due to the rapid movement speed V1 of the air in the second air movement path 234b, vacuum pressure is instantly generated in the gas outlet region of the gas guide frame 238. As a result, as the gas G is sucked into the mixed pilot gas movement path 239 through the gas movement path 238a and moves, the air A and the gas G are mixed based on Bernoulli's theorem.

[0067] To this end, the inner diameter R3 of the gas inlet 236 is larger than the inner diameter R1 of the air inlet 234 to adjust the inflow speed of gas G to be lower than the inflow speed of air A, and the inner diameter R4 of the gas movement path 238a formed inside the gas guide frame 238 is also significantly larger than the second air movement path 234b.

[0068] In the present invention, the width of the second air moving path 234b and the inner diameter R4 of the gas moving path 238a are designed so that the mixed pilot gas G1 can be mixed at a mixing ratio according to the type of gas G. When the gas G is liquefied natural gas (LNG), the mixing ratio of air A to gas G is adjusted to 10.3:1, when the gas G is liquefied petroleum gas (LPG), the mixing ratio of air A to gas G is adjusted to 24:1, and when the gas G is butane, the mixing ratio of air A to gas G is adjusted to 34.2:1.

[0069] The air A at the first velocity V1 and the gas G at the second velocity V2 are mixed in the mixed pilot gas moving path 239 , and the mixed mixed pilot gas G1 moves from the mixed pilot gas moving path 239 to the plug insertion path 233 and then moves along the mixed pilot gas delivery pipe 220 .

[0070] like Figure 4 As shown, the mixed pilot gas G1 moving along the mixed pilot gas delivery pipe 220 moves along the space between the support insulators 240 and moves to the other end 213 of the plug.

[0071] The gas guide frame 238 is formed between the gas inlet 236 and the mixed pilot gas movement path 239 and guides the gas G to be sucked into the mixed pilot gas movement path 239 and move based on Bernoulli's theorem. The above-mentioned gas G has a relatively low pressure and a relatively low speed due to the pressure or speed of the air A flowing into the mixed pilot gas movement path 239.

[0072] The gas guide frame 238 is arranged in parallel with the mixed pilot gas path 239, and the gas path 238a is arranged inside with a fourth inner diameter R4 which is smaller than the third inner diameter R3 of the gas inlet 236 and larger than the second air path 234b.

[0073] The gas guide frame 238 is formed in the vertical direction of the air inlet 234 and guides the air A moving to the first air moving path 234a to switch the moving direction to the second air moving path 234b. In this case, the width of the second air moving path 234b can be adjusted by the thickness of the air moving blocking flange 238b protruding from the outer peripheral surface of the upper end of the gas guide frame 238.

[0074] On the other hand, Figure 4 As shown, a flashback prevention insulator 250 is formed inside the other end 213 of the spark plug 210. The flashback prevention insulator 250 is used to prevent the spark generated by the ignition of the mixed pilot gas G1 in the other end 213 of the plug from moving in the opposite direction instead of moving along the combustion tube 40 side. That is, the spark can stably burn the main mixed gas by preventing the reverse movement of the spark.

[0075] Reference Figures 3 to 6 , the use process of the igniter 1 of the present invention having such a structure will be described.

[0076] The igniter 1 is assembled from a main mixed gas delivery pipe 100 and a spark plug assembly 200. Figure 5 As shown, in the spark plug assembly 200, the mixer insertion end 211a of the plug head 211 is threadedly coupled to the first coupling port 233a of the gas-air mixer 230, and the spark plug 210 is inserted into the plug insertion path 233 inside the mixer body 231 and accommodated in the mixed pilot gas delivery pipe 220 in the opposite direction. The front end of the mixed pilot gas delivery pipe 220 is inserted into the second coupling port 233b of the gas-air mixer 230. A plurality of support insulators 240 are arranged inside the mixed pilot gas delivery pipe 220 along the length direction to constantly support the interval between the spark plug 210 and the mixed pilot gas delivery pipe 220.

[0077] Therefore, in the spark plug assembly 200, the spark plug 210, the mixed pilot gas delivery pipe 220, and the gas-air mixer 230 can be configured in an integrated box form, so that the disassembly and replacement thereof become easier.

[0078] Also, stable ignition of the mixed pilot gas G1 may be achieved by constantly maintaining the interval between the mixed pilot gas delivery pipe 220 and the spark plug.

[0079] The assembled spark plug assembly 200 is assembled with the main mixed gas delivery pipe 100. Figure 4 As shown, when the igniter 1 is assembled and the supply of air A, gas G and main mixed gas is realized, as shown in FIG. Figure 6As shown in part (a) of FIG. 2 , air A flows into the air inlet 234. As the width of the first air movement path 234a gradually narrows, the speed of the air A flowing into the air inlet 234 increases to the first speed, and the air A hits the gas guide frame 238, causing the path to be switched.

[0080] Moreover, in the narrow gap of the second air movement path 234b, the speed is greatly increased and the gas moves to the mixed pilot gas movement path 239. On the other hand, the gas G flowing into the gas inlet 236 is sucked into the mixed pilot gas movement path 239 due to the speed difference and pressure difference through the gas movement path 238a connected to the mixed pilot gas movement path 239 and moves.

[0081] In the mixed pilot gas moving path 239, the sucked gas G is mixed with the air A at a ratio of 10:1, and the mixed pilot gas G1 moves along the mixed pilot gas moving path 239. In addition, the mixed pilot gas G1 is ignited by the spark generated by the other end 213 of the spark plug 210 at the end of the mixed pilot gas moving path 239. As the spark generated by the ignition supplies the main mixed gas moving along the main mixed gas delivery pipe 100, the main mixed gas is burned and moves to the combustion pipe 40 ( Figure 1 ).

[0082] As shown above, since the igniter of the present invention includes a spark plug assembly that is assembled into one body by the spark plug, the mixed pilot gas delivery pipe, and the gas-air mixer, when a specific part is damaged due to high temperature, only the entire spark plug assembly needs to be replaced, thus having the advantage of reducing the time and manpower required for replacement and disassembly.

[0083] Furthermore, the igniter of the present invention uses Bernoulli's theorem to achieve mixing of gas and air for mixing pilot gas based on the speed difference between air and gas, and therefore has the advantage of being able to achieve stable ignition based on a constant mixing ratio.

[0084] Furthermore, a flashback preventing insulator is formed at the end of the spark plug, thereby having the advantage of preventing flame flashback.

[0085] As described above, the embodiments of the igniter of the present invention are only examples, and ordinary technicians in the technical field to which the present invention belongs can realize various modifications and other equivalent embodiments. Therefore, the present invention is not limited to the forms mentioned in the above specific description. In addition, the true technical protection scope of the present invention should be defined based on the technical concept of the attached invention protection scope. Moreover, the present invention includes the concept of the present invention defined according to the attached invention protection scope and all modified technical solutions, equivalent technical solutions and alternative technical solutions within its scope.

Claims

1. A pilot burner that generates heat by burning a main gas mixture, characterized in that: The above-mentioned igniter comprises: a main mixed gas delivery pipe (100) formed to a predetermined length and used for delivering the main mixed gas to the interior; and The spark plug assembly (200) is formed by combining a mixed pilot gas delivery pipe (220), a spark plug (210) and a gas-air mixer (230). The mixed pilot gas delivery pipe (220) is accommodated in the main mixed gas delivery pipe (100) and is used to deliver the mixed pilot gas. The spark plug (210) is accommodated in the mixed pilot gas delivery pipe (220). The gas-air mixer (230) connects one end of the spark plug (210) to the mixed pilot gas delivery pipe (220) and is used to supply the mixed pilot gas mixed with air and gas to the mixed pilot gas delivery pipe (220). The gas-air mixer (230) comprises: The mixer body (231) is formed with a plug insertion path (233) along the horizontal direction for the spark plug (210) to penetrate and insert; a mixed pilot gas moving path (239) vertically formed on the plug insertion path (233) to communicate with the plug insertion path (233) inside the mixer body (231), so that the mixed pilot gas formed by mixing air and gas is supplied to the mixed pilot gas delivery pipe (220) through the plug insertion path (233); A gas inlet (236) is formed through the outer peripheral surface of the mixer body (231) along the coaxial direction of the mixed pilot gas moving path (239) to allow gas to flow in; a gas guide frame (238) disposed between the gas inlet (236) and the mixed pilot gas moving path (239), forming a gas moving path (238a) connecting the gas inlet (236) and the mixed pilot gas moving path (239) to guide the movement of the gas (G); and The air inlet (234) is formed through the front of the mixer body (231) toward the gas guide frame (238) to guide the air (A) to move to the mixed pilot gas moving path (239) after hitting the gas guide frame (238). The speed at which air flows in from the air inlet (234) is greater than the speed at which gas flows in from the gas inlet (236), and the air and gas flowing in from the mixed pilot gas moving path (239) are mixed in a ratio of 10:

1.

2. The igniter according to claim 1, characterized in that: In the mixed pilot gas delivery pipe (220), a plurality of support insulators (240) are formed at predetermined intervals along the length direction. In the mixed pilot gas delivery pipe (220), a flashback prevention insulator (250) is formed in a region connected to the main mixed gas delivery pipe (100).

Images