Miniature burner for diesel engine flame inlet gas heating device
By designing a micro burner for diesel engine flame intake heating device, the problems of ignition difficulty and combustion instability in low temperature and high altitude environments were solved, achieving high combustion efficiency and stable combustion.
Patent Information
- Application Number
- CN202511338987.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-18
- Publication Date
- 2025-12-09
AI Technical Summary
Existing diesel engine flame intake heating devices suffer from ignition difficulties and unstable combustion in low-temperature and high-altitude environments.
A miniature burner for a diesel engine flame intake heating device was designed, including an atomizing cap, an atomizing mesh, a glow plug, an air distributor, an intake shroud, and a flame tube. Through the design of the intake port and air distribution port with a specific structure, the fuel and fresh air are efficiently mixed and ignited to form a high-temperature flame, and combustion is stabilized under the action of the flame stabilizer.
It improves the degree of oil-gas atomization and ignition speed, enhances combustion efficiency, and ensures stable combustion in high-altitude and low-temperature environments.
Smart Images
Figure CN121088543A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of engines, and particularly relates to a micro combustor for a diesel engine flame air heating device. BACKGROUND
[0002] The flame air heating device is a device for improving the low-temperature starting performance of a diesel engine by burning part of engine intake air to improve the intake air temperature and is widely applied to military and civilian diesel engines. The combustor is an important component of the flame air heating device, which integrates the functions of diesel atomization, formation of combustible mixture and ignition, and also has the advantages of small size and convenient installation on the intake pipe.
[0003] The current combustor has the disadvantages of low ignition environment temperature, low combustion efficiency and unstable combustion, which are particularly prominent in plateau environments, and even cannot successfully ignite. SUMMARY
[0004] Therefore, the application aims to provide a micro combustor for a diesel engine flame air heating device to solve the problems of difficult ignition and unstable combustion of the current combustor in low-temperature and plateau environments.
[0005] To achieve the above-mentioned purpose, the technical scheme of the application is as follows: The application provides a micro combustor for a diesel engine flame air heating device, which comprises an atomization cover, an atomization net, an electric heating plug, an air distributor, an air inlet cover and a flame cylinder. An air inlet hole, an ignition oil channel, an oil inlet channel and an evaporation oil hole are formed in the atomization cover, the ignition oil channel, the oil inlet channel and the evaporation oil hole are in communication, an evaporation oil pipe is arranged in the evaporation oil hole, fuel enters the atomization net through the ignition oil channel and is sprayed on the atomization net, and the remaining fuel enters the evaporation oil pipe. An air inlet cavity is formed between the air distributor and the air inlet cover, the top end of the air inlet cover is connected with external components through an air distribution flange, the air distribution flange is arranged on the atomization cover, an evaporation pipe is arranged on the air distributor, the evaporation oil pipe is located in the air inlet cavity, the outlet end of the evaporation oil pipe is inserted into the evaporation pipe, and an air distribution hole is formed in the air distribution flange. Part of the fresh air from the air inlet hole enters the ignition area, the rest of the fresh air enters the air inlet cavity through the air distribution hole, the fresh air mixes with the fuel in the ignition area, and under the high temperature of the glow plug, a high temperature flame is formed and blown to the flame stabilizing area, the incomplete combustion of the fuel and the fresh air through the air inlet cavity are mixed and burned again in the flame stabilizing area, and under the action of the flame stabilizing wing, the high temperature flame is sprayed out of the flame tube outlet.
[0006] Further, two layers of first air inlet holes and second air inlet holes with opposite rotation directions are arranged on the atomizing cover, and the air flow entering from the air inlet hole accounts for 20-30% of the total air flow. The center line of the first air inlet hole and the tangent of the corresponding circle form a certain angle.
[0007] Further, the angle of the first air inlet hole is set to 50-60°, and the angle of the second air inlet hole is set to 43-53°.
[0008] Further, a mounting stopper is arranged below the atomizing cover, the atomizing screen and the air distributor are arranged in the mounting stopper correspondingly, the outer surface of the atomizing screen is attached to the inner surface of the semicircular arc of the atomizing cover, and the air distributor is fixedly connected with the mounting stopper.
[0009] Further, the evaporation oil pipe is in L-shaped structure, one end of the evaporation oil pipe is inserted into the evaporation oil hole and fixedly connected with the atomizing cover, and the other end of the evaporation oil pipe is inserted into the evaporation pipe.
[0010] Further, third air inlet holes, fourth air inlet holes and fifth air inlet holes are arranged on the air distributor in a circumferential direction, and the third air inlet holes, the fourth air inlet holes and the fifth air inlet holes are arranged in a hierarchical structure. The air inlet amount of the third air inlet hole and the fourth air inlet hole accounts for 20-30% of the air inlet amount into the air inlet cavity. The air inlet amount of the fifth air inlet hole accounts for 30-50% of the air inlet amount into the air inlet cavity.
[0011] Further, an evaporation pipe mounting hole is arranged on the air distributor near the fifth air inlet hole, one end of the evaporation pipe is arranged in the evaporation pipe mounting hole, and the other end of the evaporation pipe is arranged obliquely upward and is located at a position 5-20 mm away from the glow plug.
[0012] Further, a flame stabilizing wing mounting hole is arranged above the fourth air inlet hole, and a plurality of flame stabilizing wing mounting holes are arranged in a circumferential direction. The flame stabilizing wing is in V-shaped structure, the flame stabilizing wing is arranged horizontally upward with an angle of 20-50°, and is fixedly arranged on the air distributor.
[0013] Further, a heat insulation pad is additionally arranged between the air distribution flange and the air inlet cover.
[0014] Further, a heat insulation cylinder is fixedly arranged at the bottom outer edge of the air inlet cover, and the heat insulation cylinder is sleeved outside the flame cylinder, and a heat insulation area is formed between the flame cylinder and the heat insulation cylinder.
[0015] Compared with the prior art, the micro combustor for the diesel engine flame air inlet heating device has the following beneficial effects: The micro combustor for the diesel engine flame air inlet heating device can improve the oil gas atomization degree and ignition speed, thereby improving the combustion efficiency, and improving the lean blowout limit and ignition air speed, so as to achieve the purpose of stable combustion in a plateau low-temperature environment. BRIEF DESCRIPTION OF DRAWINGS
[0016] The drawings constituting a part of the present application are used to provide further understanding of the present application, the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings: Figure 1 The micro combustor for the diesel engine flame air inlet heating device according to the embodiment of the present application is shown in a sectional view; Figure 2 The micro combustor for the diesel engine flame air inlet heating device according to the embodiment of the present application is shown in a top view; Figure 3 The atomization cover according to the embodiment of the present application is shown in a sectional view; Figure 4 The atomization cover according to the embodiment of the present application is shown in a structural schematic view; Figure 5 The air distributor according to the embodiment of the present application is shown in a structural schematic view.
[0017] Explanation of reference signs: 1-atomization cover; 2-atomization net; 3-air distribution flange; 4-heat insulation pad; 5-evaporation oil pipe; 6-flame stabilizing wing; 7-air distributor; 8-evaporation pipe; 9-air inlet cover; 10-flame cylinder; 11-heat insulation cylinder; 12-ignition area; 13-air inlet cavity; 14-flame stabilizing area; 15-post-combustion area; 16-heat insulation area; 17-mounting hole; 18-air distribution hole; 19-fastening screw; 20-electric heating plug; 21-ignition oil channel; 22-oil inlet channel; 23-evaporation oil hole; 24-mounting stop; 25-threaded hole; 26-electric heating plug mounting hole; 27-second air inlet hole; 28-first air inlet hole; 29-third air inlet hole; 30-fourth air inlet hole; 31-fifth air inlet hole; 32-evaporation pipe mounting hole; 33-flame stabilizing wing mounting hole. DETAILED DESCRIPTION
[0018] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to specific embodiments and drawings.
[0019] It should be noted that, unless otherwise defined, technical terms or scientific terms used in the embodiments of the present application should be understood as their common meanings to those skilled in the art to which the present application pertains. The terms "first", "second" and similar terms used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. The terms "include", "contain" and similar terms mean that the components or objects before the terms encompass the components or objects listed after the terms and their equivalents, without excluding other components or objects. The terms "connect" or "connected" and similar terms do not mean physical or mechanical connection, but can include electrical connection, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like only represent relative positional relationships, which can change accordingly when the absolute positions of the described objects change.
[0020] Please refer to Figure 1 and Figure 2 As shown in the drawings, the micro-combustor for a diesel engine flame intake heating device includes an atomizing cover 1, an atomizing net 2, an electric heating plug 20, an air distributor 7, an air inlet cover 9 and a flame cylinder 10. The atomizing cover 1 is provided with an air inlet hole, an ignition oil channel 21, an oil inlet channel 22 and an evaporation oil hole 23. The ignition oil channel 21, the oil inlet channel 22 and the evaporation oil hole 23 are in communication. An evaporation oil pipe 5 is arranged in the evaporation oil hole 23. Fuel enters the ignition oil channel 21 and is sprayed on the atomizing net 2, and the remaining fuel enters the evaporation oil pipe 5. The bottom edge of the air distributor 7 is fixedly connected to the inner wall of the air inlet cover 9, and an air inlet cavity 13 is formed between the air distributor 7 and the air inlet cover 9. The top end of the air inlet cover 9 is connected to an external component through an air distribution flange 3. The air distribution flange 3 is arranged on the atomizing cover 1. An evaporation pipe 8 is arranged on the air distributor 7. The evaporation oil pipe 5 is located in the air inlet cavity 13, and the outlet end of the evaporation oil pipe 5 is inserted into the evaporation pipe 8. The air distribution flange 3 is provided with an air distribution hole 18. A plurality of flame stabilizing wings 6 are axially and uniformly arranged on the air distributor 7. The inner cavity of the atomizing net 2 and the upper part of the flame stabilizing wings 6 form an ignition zone 12. The outlet end of the evaporation pipe 8 extends into the ignition zone 12. The inside of the air distributor 7 and the lower part of the flame stabilizing wings 6 form a flame stabilizing zone 14. A part of the fresh air from the air inlet hole enters the ignition zone 12, and the rest of the fresh air enters the air inlet cavity 13 through the air distribution hole 7. The fresh air mixes with the fuel in the ignition zone 12, and under the high-temperature action of the glow plug 20, a high-temperature flame is formed and blown to the flame stabilizing zone 14. The fuel that has not been completely burned mixes with the fresh air in the air inlet cavity again in the flame stabilizing zone 14 and burns again. Under the action of the flame stabilizing wing 6, the high-temperature flame formed is sprayed out of the flame tube 10 outlet.
[0021] In this embodiment, the components of the burner are explained as follows: As shown in Figure 2 , the air distribution flange 3 is arranged at the top end of the air inlet cover 9, and a heat insulation pad 4 is arranged between the air distribution flange 3 and the air inlet cover 9. In addition, the air distribution flange is provided with air distribution holes 18 around the atomizing cover 1. The external fresh air enters the air inlet cavity 13 through the air distribution holes 18. The air distribution flange 3 is also provided with mounting holes for fixed connection with external components.
[0022] As shown in Figure 1 and Figure 3 , the atomizing cover 1 is designed with a mounting stop 24 at the bottom. The atomizing screen 2 and the air distributor 7 are sequentially mounted from top to bottom. The outer surface of the atomizing screen 2 is attached to the inner surface of the half-circular arc of the atomizing cover 1. The air distributor 7 is fixed to the mounting stop 24 by welding.
[0023] As shown in Figure 3 , the atomizing cover 1 is designed with an oil inlet channel 22, an evaporation oil hole 23, and an ignition oil channel 21. The oil inlet channel 22 is connected to the external oil inlet pipe by welding for oil inlet. The inner diameter of the evaporation oil hole 23 is determined by the evaporation oil pipe 5. A certain proportion of fuel enters the atomizing screen 2 through the ignition oil channel 21, and the rest of the fuel enters the evaporation oil pipe 5.
[0024] The inner diameter of the ignition oil channel 21 of the atomizing cover 1 and the inner diameter of the evaporation oil pipe 5 are determined according to the amount of oil distribution and the length of the oil channel. Generally, the amount of oil entering the ignition oil channel 21 accounts for 30% to 50% of the total oil amount. The inner diameter of the ignition oil channel 21 is 0.2 to 0.5 mm, and the inner diameter of the evaporation oil pipe 5 is 0.4 to 1 mm.
[0025] The evaporation oil pipe 5 is designed in an L shape, with one end inserted into the evaporation oil hole 23 and fixed to the atomizing cover by welding, and the other end inserted into the evaporation pipe 8.
[0026] As shown in Figure 4 , the atomizing cover 1 is designed with a threaded hole 25, which is assembled with the fastening screw 19 in Figure 2 to form an interference fit, thereby preventing the fastening screw 19 from loosening and fixing the glow plug 20.
[0027] The atomizing cover 1 is designed with two layers of air inlet holes with opposite rotation and same number from top to bottom. The center line of the first air inlet hole 28 forms a certain angle with the tangent of the circle, and the center line of the second air inlet hole 27 forms a certain angle with the tangent of the circle. The angle is determined according to the air supply amount to the burner. The larger the air flow, the smaller the angle, so as to ensure that the air flow speed in the center of the combustion chamber is not too large, and the flame is stable. Generally, the angle of the first air inlet hole 28 is designed to be 50°-60°, and the angle of the second air inlet hole 27 is designed to be 43°-53°.
[0028] In the atomizing cover 1, the air flow entering from the double-layer hole accounts for 20%-30% of the total inlet air flow. The number and diameter of the double-layer hole are determined by the amount of air entering. The larger the diameter, the fewer the number. Generally, the diameter of the first air inlet hole 28 is designed to be 2-3 mm, and the number is 3-5; the diameter of the second air inlet hole 27 is designed to be 2-3 mm, and the number is 3-5.
[0029] As shown in Figure 5 The air distributor 7 is designed with three layers of air inlet holes from top to bottom for distributing air flow and realizing uniform air entering the flame stabilizing area 14. The third air inlet hole 29 is distributed in 6-8, with a diameter of 1.5-4 mm, accounting for 20%-30% of the inlet air flow into the air inlet cavity 13; the fourth air inlet hole 30 is distributed in 6-8, with a diameter of 1.5-4 mm, accounting for 20%-30% of the inlet air flow into the air inlet cavity 13; the fifth air inlet hole 31 is distributed in 8-12, with a diameter of 1.5-4 mm, accounting for 30%-50% of the inlet air flow into the air inlet cavity 13.
[0030] The air distributor 7 is designed with an evaporation pipe mounting hole 32 near the fifth air inlet hole 31. The evaporation pipe 8 is L-shaped, one end penetrates through the evaporation pipe mounting hole 32 and is fixed on the air distributor 7 by welding, and the other end is inclined upward and reaches a position 5-20 mm away from the glow plug 20. The purpose is to quickly blow away the fuel vapor at the outlet of the oil pipe, prevent carbon deposition, and also accelerate the mixing speed of oil and gas, and improve the ignition speed.
[0031] The fourth air inlet hole 30 of the air distributor 7 is designed with a flame stabilizing wing mounting hole 33 above it, which is uniformly distributed in 3-6. The flame stabilizing wing 6 is designed as a V shape with a V angle of 20°-50°, and is installed in the flame stabilizing wing mounting hole 33 on the air distributor 7 with a horizontal upward angle of 20°-50°, and is welded and fixed. It is used to form a certain gas standing vortex in the V-shaped angle of the flame stabilizing wing 6, reduce the gas flow speed, accelerate the secondary fuel atomization, and stabilize the flame.
[0032] The flame tube 10 is welded at the bottom of the air distributor 7 to form a post-combustion zone 15 for re-atomizing and burning the unburned fuel; the heat insulation cylinder 11 is sleeved outside the flame tube 10 to form a heat insulation zone 16 between the heat insulation cylinder 11 and the flame tube 10, and is welded at the outer edge of the bottom of the air distributor 7 to quickly raise the wall surface temperature of the flame tube 10, improve the atomization mixing degree of the oil gas, and improve the combustion efficiency.
[0033] The working process of the above burner is as follows: the fuel enters from the fuel inlet pipe 22, a part of the fuel enters and is sprayed on the atomizing net 2 through the ignition oil channel 21 at a certain ratio, and the rest of the fuel flows into the evaporation pipe 8 through the evaporation oil pipe 5. At the same time, the external fresh air enters the ignition zone 12 through the double-layer air inlet hole on the atomizing cover 1 at a certain ratio, and the rest of the fresh air enters the air inlet cavity 13 through the air distribution hole 18. Under the high-temperature action of the electric heating plug 20, the fresh air and the fuel are first atomized, mixed, and ignited in the ignition zone 12 to form a high-temperature flame, which blows towards the flame stabilization zone 14 and heats the evaporation pipe 8, atomizes the fuel flowing into the evaporation pipe 8 through the evaporation oil pipe 5, and mixes with the air in the evaporation pipe 8 to form a mixed gas, which blows towards the high-temperature electric heating plug 20 from the evaporation pipe 8 outlet and is ignited. The unburned fuel in the ignition zone 12 and the fresh air passing through the air inlet cavity 13 are mixed and burned again in the flame stabilization zone 14 under the action of the flame stabilization wing 6 to form a high-temperature flame, which blows towards the post-combustion zone 15. Under the action of the heat insulation cylinder 11, the wall surface temperature of the flame tube 10 is quickly raised to re-atomize and ignite the unburned fuel, and the high-temperature flame is sprayed out of the flame tube 10 outlet.
[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered within the scope of the claims and the description of the present application.
[0035] The embodiments of the present application are intended to cover all such replacements, modifications and variations of the present application falling within the broadest scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principles of the embodiments of the present application should be included within the protection scope of the present application.
Claims
1. A miniature burner for a diesel engine flame intake heating device, comprising an atomizing cap, an atomizing mesh, a glow plug, an air distributor, an intake shroud, and a flame tube, characterized in that: The atomizing cover is provided with an air inlet, an ignition oil passage, an oil inlet, and an evaporation oil hole. The ignition oil passage, the oil inlet, and the evaporation oil hole are connected. An evaporation oil pipe is provided in the evaporation oil hole. Fuel enters through the ignition oil passage and is sprayed onto the atomizing mesh, while the remaining fuel enters the evaporation oil pipe. An air intake chamber is formed between the air distributor and the air intake hood. The top of the air intake hood is connected to an external component through an air distribution flange, and the air distribution flange is externally mounted on the atomizing cover. An evaporation pipe is installed on the air distributor. The evaporation oil pipe is located inside the air intake chamber, and the outlet end of the evaporation oil pipe is inserted into the evaporation pipe. An air distribution hole is opened on the air distribution flange. The air distributor is also axially evenly distributed with multiple flame stabilizing wings. The inner cavity of the atomizing mesh and the upper part of the flame stabilizing wings form an ignition zone. The outlet end of the evaporator tube extends into the ignition zone. The interior of the air distributor and the lower part of the flame stabilizing wings form a flame stabilizing zone. A portion of the fresh air from the outside enters the ignition zone through the air intake port, while the remaining fresh air enters the intake chamber through the air distribution port. The fresh air mixes with the fuel in the ignition zone and, under the high temperature of the glow plug, forms a high-temperature flame that is blown toward the flame stabilization zone. The unburned fuel mixes and burns again with the fresh air passing through the intake chamber in the flame stabilization zone. Under the action of the flame stabilization fins, the resulting high-temperature flame is ejected from the flame tube outlet.
2. The burner according to claim 1, characterized in that: The atomizing cover has two layers of first and second air inlets with opposite rotation directions, and the airflow entering through the air inlets accounts for 20% to 30% of the total airflow. The centerline of the first air intake and the tangent of the corresponding circle form a certain angle.
3. The burner according to claim 2, characterized in that: The included angle of the first air inlet is set to 50°~60°, and the included angle of the second air inlet is set to 43°~53°.
4. The burner according to claim 1, characterized in that: An installation stop is provided below the atomizing cover. The atomizing mesh and the air distributor are respectively disposed in the installation stop. The outer surface of the atomizing mesh is in contact with the semi-circular inner surface of the atomizing cover, and the air distributor is fixedly connected to the installation stop.
5. The burner according to claim 1, characterized in that: The evaporation oil pipe has an L-shaped structure, with one end inserted into the evaporation oil hole and fixedly connected to the atomizing cap, and the other end inserted into the evaporation pipe.
6. The burner according to claim 1, characterized in that: The air distributor is circumferentially arranged with a third air inlet, a fourth air inlet and a fifth air inlet, and the third air inlet, the fourth air inlet and the fifth air inlet are arranged in a hierarchical structure. Among them, the air intake volume of the third air intake port and the fourth air intake port accounts for 20% to 30% of the air intake volume entering the air intake chamber; The air intake volume of the fifth air intake hole accounts for 30% to 50% of the air intake volume entering the air intake chamber.
7. The burner according to claim 6, characterized in that: The air distributor has an evaporator tube mounting hole near the fifth air inlet. One end of the evaporator tube is installed in the evaporator tube mounting hole, and the other end is set obliquely upward and 5mm to 20mm away from the glow plug.
8. The burner according to claim 2, characterized in that: A flame stabilizer mounting hole is provided above the fourth air intake, and multiple flame stabilizer mounting holes are evenly distributed around the circumference. The flame stabilizer has a V-shaped structure, and is set horizontally upward at an angle of 20° to 50°, and is fixed on the air distributor.
9. The burner according to claim 1, characterized in that: A heat insulation pad is also installed between the air distribution flange and the air intake hood.
10. The burner according to claim 1, characterized in that: A heat insulation cylinder is fixedly installed on the bottom outer edge of the air intake shroud, and the heat insulation cylinder is sleeved on the outside of the flame tube, forming a heat insulation zone between the flame tube and the heat insulation cylinder.