Combustion chamber assembly of natural gas heater

Abstract

The invention discloses a natural gas heater combustion chamber assembly, and relates to the technical field of heater combustion chamber assemblys.The natural gas heater combustion chamber assembly comprises a combustion cylinder, a natural gas supply unit, a combustion-supporting gas supply unit, a spark plug and a flame probe, and an inner cylinder is arranged in the combustion cylinder so that a mixing chamber located on the inner side and a combustion chamber located on the outer side of the mixing chamber can be formed in the combustion cylinder; the natural gas supply unit and the combustion-supporting gas supply unit are both communicated with the mixing chamber, natural gas and combustion-supporting gas are mixed in the mixing chamber, and the spark plug and the flame probe are both inserted into the combustion chamber. The inner cylinder is arranged in the combustion cylinder to form the independent mixing chamber and the combustion chamber, the nozzle and the air guide wheel / the air guide fin are adopted in the mixing chamber to cooperatively guide airflow, and the relative arrangement of the spark plug and the ion flame probe is optimized, so that high-uniformity premixing and rapid and reliable ignition of natural gas and combustion-supporting air are realized; the problems that an existing diesel oil modified combustion chamber is uneven in mixing during natural gas combustion, fire is cut off, ignition detection is delayed and the like are solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of heater combustion chamber assemblies, in particular to a natural gas heater combustion chamber assembly. BACKGROUND

[0002] An intelligent and connected vehicle (ICV) is a vehicle system that deeply integrates perception, decision-making, execution and vehicle-road-cloud communication, and aims to improve safety, efficiency and travel experience. The relationship between the intelligent and connected vehicle and the heater combustion chamber lies in the coupling of the "control and diagnosis interface, thermal management and emission constraints".

[0003] Compared with traditional diesel fuel, natural gas is cheaper, more energy-saving and more environmentally friendly, so a large number of medium and heavy trucks, engineering machinery and special vehicles using natural gas as fuel have appeared on the market. The matching vehicle-mounted heater is gradually transitioning from a diesel heater to a natural gas heater. At present, the natural gas heater combustion chambers on the market are mostly simple modifications of combustion chambers for diesel heaters, and cannot better adapt to the combustion of natural gas.

[0004] Publication No. CN204693414U discloses a cyclone air premixed natural gas burner. It comprises a cylindrical premixing cavity; a natural gas inlet nozzle and an air inlet nozzle are installed at the head of the premixing cavity; the air inlet nozzle is arranged radially eccentrically along the premixing cavity; a combustion chamber is connected to the tail of the premixing cavity, and a spark plug and a flame detector are installed on the combustion chamber. In operation, natural gas enters the premixing cavity through the natural gas inlet nozzle, air enters the premixing cavity through the air inlet nozzle, the air forms a cyclone in the premixing cavity and is fully mixed with the air, the mixed gas is compressed first and then expanded through the neck, forms a low-speed backflow area in the combustion chamber, and after being ignited by the spark plug, forms a stable combustion flame. Due to the uniform mixing in the premixing cavity, the combustion efficiency is high, and the outlet temperature is uniformly distributed.

[0005] However, the mixing of natural gas and combustion air is not uniform: natural gas has low density and is easy to diffuse, the existing combustion chamber mixing chamber is mostly a single cavity structure, the combustion air enters directly, and it is difficult to form a uniform mixture with natural gas, which is prone to "local over-concentration flameout" or "local over-dilution insufficient combustion", resulting in increased gas consumption, excessive exhaust emission or failure to ignite, combustion flameout and other situations; The spark plug is inserted horizontally into the combustion chamber, and the position is deviated, which is not easy to ignite; Ignition detection reliability is poor: the existing combustion chamber mostly uses a temperature sensor to indirectly detect whether ignition is successful, which has a slow response and does not meet the concept of intelligent and connected vehicles. If a fault occurs, natural gas leakage is easy to occur, and safety is poor. SUMMARY

[0006] One of the purposes of the application is to provide a natural gas heater combustion chamber assembly, which can mix natural gas and combustion air more uniformly, so that natural gas can be fully combusted and exhaust emission can be qualified.

[0007] To achieve the above object, the present application is implemented by the following technical scheme: a natural gas heater combustion chamber assembly, comprising: a combustion cylinder having an inner cylinder separating the combustion cylinder into a mixing chamber and a combustion chamber, and the mixing chamber and the combustion chamber being in communication; a volatile felt sleeved on the outer wall of the inner cylinder; a natural gas supply unit extending from the outside of the combustion cylinder to the inside of the mixing chamber; an auxiliary gas supply unit spacedly connected with the combustion cylinder, the auxiliary gas supply unit being capable of swinging at least partially to change the air intake interval; a spark plug and a flame probe, the spark plug and the flame probe being parallel and opposite to the axis of the combustion cylinder and not coaxial, the relative position of the end points of the spark plug and the flame probe being determined by a radial offset and a circumferential angle, and the end points both being deep into the inside of the combustion chamber.

[0008] In some embodiments, the combustion cylinder has a flame baffle inside, the flame baffle being coaxially arranged with the combustion cylinder and being welded with the combustion cylinder, and a flame hole being formed in the middle of the flame baffle.

[0009] In some embodiments, the volatile felt is provided with a volatile net outside, the volatile net applying extrusion force to the volatile felt at least in a partial area to form a local extrusion zone, and the local extrusion zone causing the volatile felt to be partially compressed but not completely compressed in the area.

[0010] In some embodiments, the inner cylinder is provided with a plurality of air holes radially spacedly arranged, the combustion chamber and the mixing chamber being communicated through the air holes, and the local extrusion zone formed by the volatile net being misaligned with the air holes in the circumferential position.

[0011] In some embodiments, the auxiliary gas supply unit comprises a wind baffle, a wind guide wheel and a plurality of wind guide fins, the auxiliary gas supply unit and the combustion cylinder forming a wind guide cavity, the wind guide fins being arranged in the wind guide cavity and connected with the combustion cylinder and the wind baffle; the middle of the wind guide fins forming a connecting end inserted at least partially into the inside of the combustion cylinder and the wind baffle, the wind guide fins rotating circumferentially along the axis of the connecting end during the flow of auxiliary air; the wind guide wheel being provided with a plurality of wind guide holes.

[0012] In some embodiments, the natural gas supply unit comprises an air inlet pipe and a nozzle, the nozzle being mounted on one side of the wind baffle and extending through the wind guide wheel to the inside of the mixing chamber, and the air inlet pipe being connected with the nozzle and extending to the outside of the combustion cylinder.

[0013] In some embodiments, the volatile mesh has grooves formed at local extrusion zones to create extrusion sections, which change the extrusion pressure on the volatile felt under external force.

[0014] In some embodiments, the middle part of the evaporation net is provided with long grooves to form a deformable part in the middle part of the evaporation net. The long grooves are spaced apart, and the deformable part is attached to the evaporation felt so that the constraint force of the evaporation felt at the local compression zone is greater than the constraint force of the evaporation felt at the deformable part.

[0015] In some embodiments, a sleeve is provided on the outside of the nozzle, the inner diameter of one end of the sleeve near the nozzle is larger than the inner diameter of the other end, and the side of the sleeve near the nozzle is funnel-shaped.

[0016] In some embodiments, a flow guide is formed inside the sleeve, and the flow guide is arranged in a spiral shape.

[0017] Through the above technical solution, this application has the following beneficial effects: This application achieves high uniformity premixing of natural gas and combustion air and rapid and reliable ignition by setting an inner cylinder inside the combustion chamber to form an independent mixing chamber and combustion chamber, using nozzles and guide vanes / guide fins to guide airflow in the mixing chamber, and optimizing the relative arrangement of spark plugs and ion flame probes. This overcomes the problems of uneven mixing, misfire, and delayed ignition detection in existing diesel-converted combustion chambers when natural gas is burned.

[0018] Other features and advantages of this application will be set forth in the following description, and in part will be apparent from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is an assembly drawing for this application; Figure 2 This is a partial structural cross-sectional view of the combustion chamber of this application; Figure 3 This is a partial sectional view of the inner cylinder structure of this application; Figure 4 This is a sectional plan view of this application; Figure 5 This is a schematic diagram showing the radial offset and circumferential angle between the spark plug and the flame probe in this application. Figure 6 This is a schematic diagram of the air guide cavity structure in this application; Figure 7 This is an anatomical diagram of the wind deflector and several air guide fins of this application; Figure 8 This is an anatomical diagram of the wind guide wheel in this application; Figure 9 This is an exploded view of the inner cylinder, volatile felt, and volatile mesh structure of this application; Figure 10 This is a schematic diagram of a partial extrusion zone in this application; Figure 11 This is an enlarged view of section A in this application; Figure 12 This is a plan view of the internal structure of the sleeve in this application; Figure 13 This is a schematic diagram of the long groove and deformation section structure of this application.

[0020] In the diagram: 100 combustion chamber, 200 inner cylinder, 300 natural gas supply unit, 400 auxiliary gas supply unit, 500 spark plug, 600 flame probe; 110 Combustion chamber, 120 Mixing chamber, 130 Air guide cavity, 140 Volatilization felt, 150 Volatilization net, 160 Vent hole, 170 Flame baffle; 310 intake manifold, 320 nozzle; 410 wind deflector, 420 air guide wheel, 430 air guide fins, 440 connecting end, 450 air guide hole; 501 Local extrusion band, 502 pressure groove, 503 extrusion section; 504 long groove, 505 deformable part; 710 sleeve, 720 guide section. Detailed Implementation

[0021] The following describes several embodiments of this application with reference to the accompanying drawings. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details are not intended to limit the application. That is, these practical details are not essential in some embodiments of this application. Furthermore, features of different embodiments can be used interchangeably if feasible.

[0022] Unless otherwise defined, all terms used herein (including technical and scientific terms) have their ordinary meanings, which are understandable to those skilled in the art. Furthermore, the definitions of the aforementioned terms in commonly used dictionaries should be interpreted in the context of this specification as having the meaning consistent with the relevant field of this application. Unless specifically defined, these terms will not be interpreted as having idealized or overly formal meanings.

[0023] The following explains the relationships and terms used in this application: Parallelism: The parallelism defined in this application is not limited to absolute parallelism. This definition of parallelism can be understood as basic parallelism. It allows for situations where the parallelism is not absolute due to factors such as assembly tolerance, design tolerance, and structural flatness. It also allows for errors within a small angular range, such as within 10 degrees of assembly error. These can all be considered as parallel relationships.

[0024] Perpendicularity: The perpendicularity defined in this application is not limited to an absolute perpendicular intersection (with an included angle of 90 degrees). It is permissible for non-absolute perpendicular intersections caused by factors such as assembly tolerances, design tolerances, and structural flatness. It is permissible for errors within a small angular range, such as an assembly error range of 80 to 100 degrees, which can all be understood as a perpendicular relationship.

[0025] Ground: The ground as defined in this application is not limited to a specific material or region, but simply refers to a platform on which this application is supported, and allows for stacking, tilting, and variations in flatness. For example, cement floors, tile floors, work platforms, etc., can all be interpreted as ground.

[0026] The above explanation does not fully encompass the relationship definition given in this application, but only represents a part of it.

[0027] Intelligent connected vehicles (ICVs) are vehicle systems that deeply integrate perception, decision-making, execution, and vehicle-road-cloud communication, aiming to improve safety, efficiency, and travel experience. Their relationship with the heater and combustion chamber lies in the coupling of three aspects: "control and diagnostic interface, thermal management, and emission constraints".

[0028] Compared to traditional diesel fuel, natural gas is cheaper and more energy-efficient and environmentally friendly, leading to a surge in the market for medium and heavy-duty trucks, construction machinery, and special-purpose vehicles powered by natural gas. Consequently, the matching vehicle heaters are gradually transitioning from diesel heaters to natural gas heaters. Currently, most natural gas heater combustion chambers on the market are simple modifications of the 110 combustion chamber used in diesel heaters, which are not well-suited for natural gas combustion. Therefore, there is a need to develop a dedicated natural gas combustion chamber 110 assembly for vehicle heaters to improve natural gas combustion efficiency and reduce harmful substances and residual natural gas emissions.

[0029] Uneven mixing of natural gas and combustion air: Natural gas has low density and is easy to diffuse. The existing combustion chamber 110 and mixing chamber 120 are mostly single cavity structures. Combustion air enters directly, making it difficult to form a uniform mixture with natural gas. This can easily lead to "local over-rich flameout" or "local over-lean incomplete combustion", resulting in increased gas consumption, excessive exhaust emissions, or failure to ignite or flameout. The ignition plug is inserted horizontally into the combustion chamber 110, which is off-center and makes it difficult to ignite. Poor ignition detection reliability: The existing combustion chamber 110 mostly uses temperature sensors to indirectly detect whether ignition is successful. The response is slow, and if a malfunction occurs, natural gas leakage is likely to occur, resulting in poor safety.

[0030] This application provides a natural gas heater combustion chamber assembly, see reference. Figures 1-4 As shown, the device includes a combustion chamber 100, a natural gas supply unit 300, a combustion-supporting gas supply unit 400, a spark plug 500, and a flame probe 600. An inner cylinder 200 is provided inside the combustion chamber 100 to form a mixing chamber 120 located on the inner side and a combustion chamber 110 located on the outer side of the mixing chamber 120. The natural gas supply unit 300 and the combustion-supporting gas supply unit 400 are both connected to the mixing chamber 120 and mix the natural gas and the combustion-supporting gas inside the mixing chamber 120. The spark plug 500 and the flame probe 600 are both inserted into the combustion chamber 110.

[0031] By confining the mixing process within the mixing chamber 120 formed by the inner cylinder 200 and igniting outside the combustion chamber 110, the premixing uniformity of natural gas and combustion air can be significantly improved, local concentration fluctuations can be reduced, thereby reducing flameout, reducing fuel consumption and improving exhaust emission characteristics.

[0032] Spark plug 500 and flame probe 600 are parallel to the axis of combustion chamber 100 and are not coaxial. (See reference) Figure 5 As shown, the relative positions of the endpoints of the spark plug 500 and the flame probe 600 are determined by a radial offset L. r The circumferential angle θ is used to determine the position of the spark plug 500 and the flame probe 600, both of which extend into the inside of the combustion chamber 110.

[0033] Limiting the radial offset and circumferential angle between the spark plug 500 and the flame probe 600 and extending the end point into the combustion chamber 110 optimizes the ignition position and flame detection sensitivity, shortens the ignition time, and improves the reliability and response speed of flame detection. At the same time, the high-temperature seal ensures the sealing performance and electrical insulation under long-term high-temperature conditions, reducing the risk of false alarms and leakage.

[0034] It should be noted that the radial offset L r The diameter is between 5mm and 50mm, and the circumferential angle θ is between 0° and 15°. The spark plug 500 and flame probe 600 are installed through the wall via independent high-temperature seals, which are made of high-temperature resistant ceramic or metal-ceramic composite materials. The flame probe 600 is an ionization flame probe 600.

[0035] In embodiments of this application, the combustion chamber 100 further includes an interface module (not shown in the figure) for integration with intelligent connected vehicles. The interface module includes a temperature sensor interface, a smoke sensor interface, a flame detection signal output, and a physical connector for communicating with the vehicle network (the physical connector is one of CAN, CAN-FD, or vehicle Ethernet connector).

[0036] In some embodiments, see Figures 3-4 As shown, a flame deflector 170 is provided inside the combustion cylinder 100. The flame deflector 170 is coaxially arranged with the combustion cylinder 100, and the flame outlet formed in the middle of the flame deflector 170 is close to the outer diameter of the inner cylinder 200 for gas passage. The flame deflector 170 increases the residence time of natural gas in the combustion chamber 110 and the residence time of combustion exhaust gas, so that high temperature can be better conducted in the heat exchanger cavity, which can improve the efficiency of heat exchange and combustion and reduce the temperature of exhaust gas.

[0037] The flame deflector 170 is welded inside the combustion chamber 100.

[0038] The coaxial flame deflector 170 controls the flame shape and airflow path, prolongs the gas residence time in the combustion zone and enhances heat exchange, making combustion more complete and improving heat utilization. At the same time, it reduces the exhaust temperature, which is beneficial for downstream emission treatment and extending the life of the heat exchanger. The welding fixing method ensures structural strength and thermal stability.

[0039] See Figure 4 As shown, the natural gas supply unit 300 includes an inlet pipe 310 and a nozzle 320. The nozzle 320 is connected to the inlet pipe 310 and extends into the mixing chamber 120. The inlet pipe 310 extends outside the combustion chamber 100.

[0040] See Figures 5-7 As shown, the combustion gas supply unit 400 includes a baffle plate 410, a guide wheel 420 and several guide fins 430. The baffle plate 410 and the combustion chamber 110 form a guide cavity 130. Several guide fins 430 are disposed in the guide cavity 130 and connected to the combustion cylinder 100 and the baffle plate 410. The combustion gas enters the mixing chamber 120 from the guide fins 430.

[0041] The air guide wheel 420 is installed inside the combustion cylinder 100, the nozzle 320 is installed in the middle of the air guide wheel 420, and the air inlet pipe 310 is installed in the middle of the baffle plate 410. The air inlet pipe 310 and the nozzle 320 are connected inside the air guide cavity 130. At least a portion of the air guide fins 430 form a connecting end 440 that is at least partially inserted into the inner side of the combustion cylinder 100 and the baffle plate 410. The connecting end 440 is axial. The air guide fins 430 rotate circumferentially along the axis of the connecting end 440 during the flow of combustion air. The air guide cavity 130 is designed to allow the combustion air to enter the mixing chamber 120 more regularly through the air guide fins 430. The air guide fins 430 are all in a rotating state and work together with the air guide wheel 420 to make the combustion air enter the mixing chamber 120 in a dispersed rotating state, so as to better mix with natural gas.

[0042] It should be noted that the air guide wheel 420 has multiple air guide holes 450.

[0043] The air guide cavity 130 formed by the air guide wheel 420 and the rotating air guide fins 430 can generate controllable rotating turbulence of the combustion air, significantly enhancing the shear mixing and turbulent diffusion with natural gas, improving the mixing uniformity and reducing local rich or lean combustion, thereby improving combustion efficiency and reducing harmful emissions. The porous air guide wheel 420 helps to distribute airflow and reduce local impact.

[0044] In some embodiments, see Figure 9 As shown, the inner cylinder 200 has several vent holes 160, which are radially spaced to connect the combustion chamber 110 and the mixing chamber 120. The mixed gas inside the mixing chamber 120 enters the combustion chamber 110 through the vent holes 160.

[0045] A volatile matter mesh 150 is welded to the outside of the inner cylinder 200, forming an installation gap between the volatile matter mesh 150 and the inner cylinder 200. A volatile matter felt 140 is placed inside the installation gap. The inner wall of the volatile matter mesh 150 is in contact with the volatile matter felt 140. The volatile matter mesh 150 applies compressive force to the volatile matter felt 140 in at least a part of the area to form a local compression band 501. The local compression band 501 causes the volatile matter felt 140 to be partially compressed but not completely compressed in the area.

[0046] The compression rate of the local compression band 501 for the volatile felt 140 is between 10% and 40%. The local compression band 501 is distributed in a dot matrix or strip pattern along the ring. The compression rate of the volatile felt 140 at the local compression band 501 is greater than that at other locations.

[0047] It should be noted that the position of the local compression band 501 formed by the volatile net 150 is offset from the ventilation hole 160 formed by the inner cylinder 200, so as to ensure that the volatile felt 140 at the ventilation hole 160 is not over-compressed and to improve the air permeability of the volatile felt 140.

[0048] The combination of the volatile matter net 150 and the local compression belt 501 can not only mechanically fix the volatile matter felt 140 to prevent displacement caused by vibration or thermal cycling, but also control the local air permeability resistance through local compression, so as to achieve a balanced distribution of overall air permeability, thereby making natural gas permeate more evenly and mix stably in the mixing chamber 120, while facilitating replacement and maintenance.

[0049] To prevent the natural gas from being blown away quickly by the combustion air, the bottom of the inner cylinder 200 of the mixing chamber 120 is sealed. A fine but breathable volatile felt 140 is arranged on the outside of the inner cylinder 200, which can make the natural gas permeate more evenly from the inside of the mixing chamber 120 to the outside. To prevent the burrs of the volatile felt 140 from sticking up and coming into contact with the flame probe 600, causing a short circuit and false alarm, a layer of volatile mesh 150 is welded to the outside of the volatile felt 140 to wrap the volatile felt 140 tightly, so that the burrs of the volatile felt 140 do not stick up.

[0050] The mechanical constraint of the local compression belt 501 keeps the evaporation felt 140 in a stable position under vibration and thermal cycling, while retaining enough pores to ensure evaporation / heat transfer channels. The evaporation felt 140 can be pulled out by clamping it inside the evaporation net 150, making it easy to replace the evaporation felt 140.

[0051] Additionally, see Figures 10-11 As shown, a groove 502 is opened at the local extrusion band 501 to form an extrusion section 503 at the local extrusion band 501. The evaporation net 150 is set as a rigid material. When the extrusion section 503 is pressed, it deforms. That is, after the evaporation felt 140 is installed, the extrusion section 503 is pressed to increase the compression ratio of the extrusion section 503 to the evaporation felt 140. When the evaporation felt 140 needs to be removed, the extrusion section 503 is pried outward. At this time, the compression ratio at the local extrusion band 501 is the same as the compression ratio of the other parts.

[0052] By setting up deformable extrusion part 503 and pressure groove 502, quick fixing during installation and quick release during disassembly can be achieved, which not only ensures the stability during operation, but also significantly reduces the labor intensity and time cost of maintenance and disassembly.

[0053] In some embodiments, a sleeve 710 is disposed inside the inner cylinder 200, see reference Figure 12 As shown, the sleeve 710 is fitted on the outside of the nozzle 320. The sleeve 710 consists of two parts, one of which is funnel-shaped. The inner diameter of one end of the funnel-shaped sleeve 710 is larger than the inner diameter of the other end. A guide section 720 is formed inside the sleeve 710. The guide section 720 is spirally arranged so that the natural gas can move towards the sealing part of the inner cylinder 200 under the action of the guide section 720.

[0054] It should be noted that the guide section 720 only blocks part of the jet hole of the nozzle 320. When natural gas is ejected through the jet hole, part of the gas enters the sleeve 710 and part of the natural gas enters the mixing chamber 120. The combustion-supporting part will directly enter the sleeve 710 and mix with the natural gas, and part of the combustion-supporting part will enter the mixing chamber 120 and mix with the natural gas.

[0055] Under the action of the sleeve 710, the mixture of combustion-supporting gas and natural gas inside it will collide at the closed position of the inner cylinder 200 and mix with the mixture inside the mixing chamber 120, ensuring the uniformity of the mixing of natural gas and combustion-supporting gas in the mixing chamber 120.

[0056] The sleeve 710 and the spiral guide 720 enhance the primary turbulence and mixing of the injected natural gas and combustion-supporting gas through local guidance and impact, significantly improve the uniformity at the inlet of the mixing chamber 120 and reduce local fuel-rich or lean combustion phenomena. Furthermore, the mixing characteristics can be adjusted by changing the spiral structure parameters to adapt to different working conditions.

[0057] The guide section 720 includes multiple spiral plates welded inside the sleeve, with the spiral plates evenly arranged inside the sleeve.

[0058] Additionally, the guide portion 720 includes a plurality of protrusions formed by the deformation of the sleeve 710, the protrusions being evenly spaced and extending in a spiral shape.

[0059] In some embodiments, a long groove 504 is formed in the middle of the evaporation net 150, see reference. Figure 13 As shown, the middle part of the evaporation net 150 is divided into multiple deformation sections 505. The deformation sections 505 are made of shape memory metal so that the deformation sections 505 exhibit two different states at high and low temperatures. The deformation sections 505 are arc-shaped and connected to the local extrusion bands 501 on both sides of the evaporation net 150 to ensure that the deformation sections 505 always deform outwards and do not deform inwards, which would cause excessive compression of the evaporation felt 140. This ensures that the deformation generated by the deformation sections 505 will not have an excessive impact on the evaporation felt 140.

[0060] It should be noted that the inner wall of the deformation part 505 is also in contact with the volatile felt 140 at the position of maximum deformation. The deformation of the deformation part 505 only changes the compression ratio of the volatile felt 140, so that the volatile felt 140 has two compression ratios at high temperature and low temperature.

[0061] Although this application has been disclosed in conjunction with the above embodiments, it is not intended to limit this application. Any person skilled in the art may make various modifications and refinements without departing from the spirit and scope of this application. Therefore, the scope of protection of this application shall be determined by the appended claims.

Claims

1. A natural gas heater combustion chamber assembly, characterized in that, include: The combustion chamber (100) has an inner cylinder (200) that divides the interior of the combustion chamber (100) into a mixing chamber (120) and a combustion chamber (110), and the mixing chamber (120) is in communication with the combustion chamber (110); A volatile felt (140) is fitted onto the outer wall of the inner cylinder (200); A natural gas supply unit (300) extends from the outside of the combustion chamber (100) into the mixing chamber (120); A combustion chamber gas supply unit (400) is connected to the combustion chamber (100) at intervals, and the combustion chamber gas supply unit (400) is at least partially oscillating to change the gas intake interval; The spark plug (500) and the flame probe (600) are parallel to and opposite to the axis of the combustion chamber (100) and are not coaxial. The relative positions of the endpoints of the spark plug (500) and the flame probe (600) are determined by the radial offset and the circumferential angle, and the endpoints are both inserted into the inside of the combustion chamber (110).

2. The natural gas heater combustion chamber assembly according to claim 1, characterized in that, The combustion cylinder (100) has a flame deflector (170) inside. The flame deflector (170) is coaxially arranged with the combustion cylinder (100) and welded to the combustion cylinder (100). A flame outlet hole is formed in the middle of the flame deflector (170).

3. The natural gas heater combustion chamber assembly according to claim 1, characterized in that, The volatile felt (140) is provided with a volatile net (150) on its outer side. The volatile net (150) applies a compressive force to the volatile felt (140) in at least a portion of its area to form a local compression band (501). The local compression band (501) causes the volatile felt (140) to be partially compressed but not completely compressed in the area.

4. The natural gas heater combustion chamber assembly according to claim 3, characterized in that, The inner cylinder (200) has a plurality of vent holes (160) spaced radially to connect the combustion chamber (110) and the mixing chamber (120) through the plurality of vent holes (160). The local compression band (501) formed by the volatile mesh (150) is misaligned with the vent holes (160) in the circumferential position.

5. A natural gas heater combustion chamber assembly according to claim 1, characterized in that, The gas supply unit (400) includes a baffle plate (410), a guide wheel (420) and a plurality of guide fins (430). The gas supply unit (400) and the combustion cylinder (100) form a guide cavity (130). The plurality of guide fins (430) are disposed in the guide cavity (130) and connected to the combustion cylinder (100) and the baffle plate (410). The air guide fin (430) forms a connecting end (440) in the middle, which is at least partially inserted into the inside of the combustion cylinder (100) and the baffle plate (410). The air guide fin (430) rotates circumferentially along the axis of the connecting end (440) during the flow of combustion air. The air guide wheel (420) has multiple air guide holes (450).

6. A natural gas heater combustion chamber assembly according to claim 5, characterized in that, The natural gas supply unit (300) includes an inlet pipe (310) and a nozzle (320). The nozzle (320) is installed on one side of the baffle plate (410) and extends through the guide vane (420) into the mixing chamber (120). The inlet pipe (310) is connected to the nozzle (320) and extends outward from the combustion cylinder (100).

7. A natural gas heater combustion chamber assembly according to claim 3 or 4, characterized in that, The volatile net (150) has a pressure groove (502) at the local compression zone (501) to form a compression section (503), which changes the compression force on the volatile felt (140) under the action of external force.

8. A natural gas heater combustion chamber assembly according to claim 7, characterized in that, The volatilization net (150) is provided with a long groove (504) in the middle so that a deformable part (505) is formed in the middle of the volatilization net (150). The long groove (504) is spaced apart. The deformable part (505) is attached to the volatilization felt (140) so that the constraint force of the volatilization felt (140) at the local compression band (501) is greater than the constraint force of the volatilization felt (140) at the deformable part (505).

9. A natural gas heater combustion chamber assembly according to claim 6, characterized in that, A sleeve (710) is provided on the outside of the nozzle (320). The inner diameter of one end of the sleeve (710) near the nozzle (320) is larger than the inner diameter of the other end. The side of the sleeve (710) near the nozzle (320) is shaped like a bucket.

10. A natural gas heater combustion chamber assembly according to claim 9, characterized in that, The sleeve (710) has a flow guide (720) inside, and the flow guide (720) is spirally arranged.

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