Small fuel oil rotational flow combustion device with air assisting structure

Abstract

The utility model provides a small fuel oil swirl combustion device with an auxiliary air structure, which comprises a shell, a swirl generator and a nozzle, a combustion cavity, a main air inlet cavity and an auxiliary air cavity which are coaxial are formed in the shell, the main air inlet cavity is arranged at the front end of the combustion cavity and is communicated with the combustion cavity, the auxiliary air cavity is annular and is arranged on the outer side of a combustion chamber, and the main air inlet cavity is communicated with the auxiliary air cavity. The side wall of the combustion chamber is provided with an auxiliary air inlet hole communicating with the auxiliary air cavity and achieving air inlet combustion supporting. The rotational flow generator is arranged between the main air inlet cavity and the combustion chamber and can enable air exhausted by the main air inlet cavity to generate rotational flow and then enter the combustion chamber; the nozzle is arranged in the combustion cavity, is coaxial with the rotational flow generator and is used for spraying oil. According to the small fuel oil rotational flow combustion device with the air assisting structure, the main flow air volume and the air assisting volume are controlled through a reasonable flow field, rotational flow combustion flow field distribution of liquid fuel is regulated and controlled, efficient and sufficient combustion of the liquid fuel in a small space range is achieved, and emission of harmful gas is reduced or avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a combustion heating device, especially a small fuel oil rotational flow combustion device with air assisting structure. BACKGROUND

[0002] Compared with gaseous fuel, liquid fuel has higher energy density and more stable storage and transportation characteristics. However, since the liquid fuel needs to undergo breaking, atomization and evaporation processes before combustion, and the size and spatial distribution of liquid droplets directly affect the combustion efficiency and pollutant emissions such as unburned hydrocarbons and carbon monoxide, the combustion of liquid fuel is more complex. Moreover, liquid fuel is prone to flame instability and carbon deposition on the surface of the burner during combustion, especially in small burners with limited space. SUMMARY

[0003] Technical problems to be solved

[0004] The utility model wants to solve the technical problem to provide a kind of with air assisting structure small fuel oil rotational flow combustion device, by the reasonable flow field control main flow air volume and air assisting volume, the rotational flow combustion flow field of regulation and control liquid fuel, effectively improve the combustion efficiency of fuel oil, and can effectively control the discharge of pollutant.

[0005] Technical solutions for solving problems

[0006] The utility model provides a kind of with air assisting structure small fuel oil rotational flow combustion device, comprising:

[0007] Shell, the shell is shaped with coaxial combustion chamber, main air inlet cavity 40a and auxiliary air cavity 70a, the main air inlet cavity 40a is set in the front end of the combustion chamber and is communicated with it, the auxiliary air cavity 70a is annular and is set in the outside of the combustion chamber, the side wall of the combustion chamber is equipped with auxiliary air inlet hole 701 that is communicated with the auxiliary air cavity 70a and realizes air intake combustion support;

[0008] Rotational flow generator 6 is set between the main air inlet cavity 40a and the combustion chamber, can make the air of the main air inlet cavity 40a produce rotational flow and then enter the combustion chamber;

[0009] Nozzle 3 is set in the combustion chamber and is coaxial with the rotational flow generator 6, for oil injection;

[0010] Igniter is set in the combustion chamber, for ignition.

[0011] Further, the combustion chamber comprises a combustion chamber I 70b and a combustion chamber II 80 coaxially arranged and in communication with each other, the combustion chamber II 80 is located downstream of the combustion chamber I 70b and has a diameter larger than that of the combustion chamber I 70b, the nozzle 3 is arranged upstream of the combustion chamber I 70b and faces the combustion chamber II 80, and the auxiliary air inlet hole 701 is arranged on the side wall of the combustion chamber I 70b.

[0012] Further, the auxiliary air inlet hole 701 is a plurality of and is arranged circumferentially and uniformly, and is located downstream of the outlet plane of the nozzle.

[0013] Further, the shell comprises a combustion cylinder 8 with both ends open and a wind cylinder 4 mounted on the head of the combustion cylinder 8, the combustion chamber and the auxiliary air cavity 70a are arranged in the combustion cylinder 8, and the wind cylinder 4 coaxially arranged with an inner wind cylinder 43 forms the main air inlet cavity 40a and the auxiliary air cavity 70a, and the side wall of the auxiliary air cavity 40b is provided with a secondary air inlet hole 401, and the air inlet direction of the secondary air inlet hole 401 is tangent to the inner wall of the auxiliary air cavity 40b and forms a rotational flow.

[0014] Further, a circular flow regulating plate 5 is arranged between the auxiliary air cavity 40b and the auxiliary air cavity 70a, and the flow regulating plate 5 is circumferentially and uniformly arranged with flow regulating holes 501 to realize the communication between the auxiliary air cavity 40b and the auxiliary air cavity 70a.

[0015] Further, the rotational flow generator 6 is fixedly installed at the center of the flow regulating plate 5.

[0016] Further, the rotational flow generator 6 comprises a circular rotational flow plate, a nozzle mounting hole for mounting the nozzle 3 is arranged in the center hole of the rotational flow plate, a plurality of rotational flow hole groups 601 are circumferentially and uniformly arranged on the rotational flow plate, the rotational flow hole group 601 comprises a main hole 6011 and a secondary hole 6012 arranged on one side of the main hole 6011, the diameter of the secondary hole is smaller than that of the main hole 6011 and can generate a pressure difference to form a rotational airflow.

[0017] Further, the secondary hole 6012 is a plurality of and is unevenly distributed.

[0018] Further, the auxiliary air inlet hole 701 is a plurality of and is arranged circumferentially and uniformly.

[0019] Further, the auxiliary air inlet hole 701 is 2-5 rows and is equidistantly arranged along the axial direction.

[0020] Further, the distance between the adjacent two rows of auxiliary air inlet holes 701 is 1.5-2 times the diameter of the auxiliary air inlet hole.

[0021] Further, the number of holes in each row of the auxiliary air inlet holes is 12-36.

[0022] Further, the diameter of the auxiliary air inlet hole 701 is 3-10 mm.

[0023] Further, the rectification holes 501 are arranged in multiple rows along the diameter direction of the rectification plate 5, and each row of the rectification holes 501 is arranged circumferentially.

[0024] Further, the distance between two adjacent rows of the rectification holes is the same.

[0025] Further, the rectification holes are arranged in 2-5 rows.

[0026] Further, the number of holes in each row of the rectification holes 501 is 24-48.

[0027] Further, the distance between two adjacent rows of the rectification holes 501 is 1.5-2 times the diameter of the rectification holes.

[0028] Further, the rectification holes 501 on two adjacent rows are staggered.

[0029] Further, the diameter of the rectification holes 501 is 2-4 mm.

[0030] Further, the combustion cylinder 8 is coaxially arranged with an inner cylinder body 7, the head of the combustion cylinder 8 and the inner cylinder body 7 is fixed with a circular rectification plate 5, the tail of the inner cylinder body 7 is radially bent outward and forms a baffle ring 72, thereby separating the combustion cylinder 8 into a combustion chamber I 70b, a combustion chamber II 80 and an auxiliary air cavity 70a, and the auxiliary air inlet hole 701 is arranged on the side wall of the inner cylinder body 7.

[0031] Further, the gap between the edge of the baffle ring 72 and the inner wall of the combustion cylinder 8 is 0.5-1 mm.

[0032] Further, the baffle ring 72 is circumferentially and uniformly arranged with air holes communicating with the combustion chamber II 80.

[0033] Further, the air holes are arranged in 1-5 rows along the diameter direction of the combustion chamber II 80.

[0034] Further, the diameter of the air hole is 2-5 mm.

[0035] Further, the total area of the air holes is less than the total area of the auxiliary air inlet holes 701.

[0036] Further, the main hole and / or the auxiliary hole is an inclined hole.

[0037] Beneficial effects

[0038] The utility model discloses a small -size fuel rotational flow combustion device with wind -assisting structure, including combustion chamber, air intake structure, rotational flow structure and oil nozzle structure, its working process is as follows: supply fuel and main stream air (main air inlet cavity) first, fuel is sprayed out through the nozzle, and the rotational flow of main stream air forms after rotational flow generator and enters combustion chamber I, and under the action of rotational flow air, let the liquid drop in combustion chamber I and air fully mix, in order to improve ignition success rate, and the oil gas of supply is relatively high, and the oil gas is ignited through ignition device, but at this time, the oil gas is relatively high, and the combustion is not complete, and the flame is orange red of diffusion, subsequently, adjust main stream air intake, gradually increase main stream air intake, and begin to supply the air intake of wind -assisting (auxiliary air chamber), and the secondary air intake enters the auxiliary air chamber outside combustion chamber I after the rectifier plate, and after the rectification of the rectification hole on the rectifier plate, enter the auxiliary air chamber, and enter combustion chamber I through the auxiliary air inlet hole on the inner cylinder, and this combustion chamber I is as main combustion zone, wherein the baffle ring structure of inner cylinder end portion can better force wind to enter combustion chamber I along tangential ring hole and mix with the rotational flow main stream, strengthen the rotational flow process of main stream, make fuel spray and air more intense mixing and shearing effect, further promote the breakage, atomization and evaporation of liquid drop and the mixing of fuel and air, and the wind -assisting of radial air intake can force the flame length to shorten and gather to the center, and at this time, the flame gradually changes into the blue flame of complete combustion, the utility model discloses a small -size fuel rotational flow combustion device with wind -assisting structure, and the rotational flow combustion flow field distribution of liquid fuel is regulated through reasonable flow field control main stream air intake and wind -assisting amount, realizes the efficient complete combustion of liquid fuel in small space range, and reduces or avoids the emission of harmful gas. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 It is the structure schematic drawing of the utility model discloses a small -size fuel rotational flow combustion device with wind -assisting structure;

[0040] Figure 2 It is the explosion structure schematic drawing of the utility model discloses a small -size fuel rotational flow combustion device with wind -assisting structure;

[0041] Figure 3 It is the sectional view of the utility model discloses a small -size fuel rotational flow combustion device with wind -assisting structure;

[0042] Figure 4 It is another angle sectional view of the utility model discloses a small -size fuel rotational flow combustion device with wind -assisting structure;

[0043] Figure 5 It is the internal structure schematic drawing of the utility model discloses a small -size fuel rotational flow combustion device with wind -assisting structure;

[0044] Figure 6 It is the internal structure sectional view of the utility model discloses a small -size fuel rotational flow combustion device with wind -assisting structure;

[0045] Figure 7 It is the sectional view of the air inlet cavity of the small fuel oil rotational flow combustion device with the air assisting structure of the utility model;

[0046] Figure 8 It is the structure schematic view of the air cylinder of the small fuel oil rotational flow combustion device with the air assisting structure of the utility model;

[0047] Figure 9 It is the sectional view of the air cylinder of the small fuel oil rotational flow combustion device with the air assisting structure of the utility model;

[0048] Figure 10 It is the installation schematic view of the nozzle of the small fuel oil rotational flow combustion device with the air assisting structure of the utility model;

[0049] Figure 11 It is the installation schematic view of the rotational flow generator of the small fuel oil rotational flow combustion device with the air assisting structure of the utility model;

[0050] Figure 12 It is the structure schematic view of the rotational flow generator of the small fuel oil rotational flow combustion device with the air assisting structure of the utility model;

[0051] Figure 13 It is the structure schematic view of the rectifier plate of the small fuel oil rotational flow combustion device with the air assisting structure of the utility model;

[0052] Figure 14 It is the sectional view of the rectifier plate of the small fuel oil rotational flow combustion device with the air assisting structure of the utility model;

[0053] Figure 15 It is the structure schematic view of the inner cylinder of the small fuel oil rotational flow combustion device with the air assisting structure of the utility model;

[0054] Figure 16 It is the sectional view of the inner cylinder of the small fuel oil rotational flow combustion device with the air assisting structure of the utility model;

[0055] Figure 17 It is the structure schematic view of the main air inlet cylinder of the small fuel oil rotational flow combustion device with the air assisting structure of the utility model;

[0056] Figure 18 It is the sectional view of the main air inlet cylinder of the small fuel oil rotational flow combustion device with the air assisting structure of the utility model. DETAILED DESCRIPTION

[0057] The embodiments of the utility model will be described in detail below with reference to the drawings.

[0058] Reference Figures 1-18The utility model provides a small -size fuel oil whirl combustion device with wind -assisting structure, including the casing, whirl generator 6, nozzle 3 and igniter (not shown in the drawing).

[0059] The casing is used as a support and mounting carrier, the whirl generator 6, the nozzle 3 and the igniter are mounted in the casing, the casing is cylindrical as a whole, the combustion chamber, the main air inlet cavity 40a and the auxiliary air cavity 70a are formed in the casing, the combustion chamber, the main air inlet cavity 40a and the auxiliary air cavity 70a are coaxially arranged, in the embodiment, the cross sections of the combustion chamber, the main air inlet cavity 40a and the auxiliary air cavity 70a are circular, wherein the main air inlet cavity 40a is arranged at the front end (upstream) of the combustion chamber, the rear end of the main air inlet cavity 40a is open and communicates with the combustion chamber, and the main air inlet cavity 40a is used as the main air (air) supply end for combustion, the auxiliary air cavity 70a is annular, specifically, the auxiliary air cavity 70a is circular, the auxiliary air cavity 70a is arranged on the outer side of the combustion chamber, the auxiliary air cavity 70a is coaxially arranged with the combustion chamber, the auxiliary air inlet hole 701 is formed in the side wall of the combustion chamber, the auxiliary air inlet hole 701 communicates with the auxiliary air cavity 70a, the auxiliary air inlet hole 701 is used for realizing auxiliary air intake, thereby realizing secondary air supply (air), combustion support and improvement of the combustion rate, in the embodiment, the auxiliary air inlet hole 701 is a plurality of and is circumferentially distributed, and the auxiliary air inlet hole 701 can realize radial air intake, the radial air intake can make the flame converge to the center and shorten the flame length while improving the combustion rate; the whirl generator 6 is arranged between the main air inlet cavity 40a and the combustion chamber, the air discharged from the main air inlet cavity 40a can generate whirl (rotating air flow) and then enter the combustion chamber, the air inlet end of the main air inlet cavity 40a is arranged at the end, and preferably, the air inlet end is coaxial with the whirl generator; the nozzle 3 is arranged in the combustion chamber, the nozzle 3 is arranged at the upstream end of the combustion chamber, that is, close to the air inlet end, the nozzle 3 is coaxial with the whirl generator 6 and is used for oil injection; the nozzle is located at the center of the whirl generator, that is, located at the center of the whirl, the whirl can form vortex flow in the combustion chamber, can refine the oil mist diameter, increase the surface area of the oil gas and air mixing, promote uniform mixing, thereby realizing more sufficient combustion, improving the thermal efficiency and reducing harmful waste gas emission; at the same time, the whirl can effectively promote heat transfer, strengthen air circulation and accelerate heat diffusion; the igniter is arranged in the combustion chamber and is used for ignition, and high-voltage arc discharge ignition, small flame ignition and the like can be used; the above-mentioned whirl generator 6 can make the air enter the combustion chamber in the form of rotating air flow, thereby enhancing the mixing effect of the air and the fuel, improving the combustion efficiency, realizing sufficient combustion and reducing harmful waste gas emission.

[0060] In the application, the combustion chamber includes coaxially arranged combustion chamber I 70b and combustion chamber II 80, the combustion chamber I 70b and the combustion chamber II 80 are coaxially arranged, the combustion chamber II 80 is located downstream of the combustion chamber I 70b, and the diameter of the combustion chamber II 80 is greater than the diameter of the combustion chamber I 70b, the nozzle 3 is arranged upstream of the combustion chamber I 70b, and the oil injection end of the nozzle 3 faces the combustion chamber II 80, the igniter is arranged in the combustion chamber II 80 and located close to one end of the combustion I 70b; the auxiliary air cavity 70a is arranged outside the combustion chamber I 70b, the auxiliary air inlet hole 701 is arranged on the side wall of the combustion chamber I 70b and is circumferentially distributed; the end or the side wall of the auxiliary air cavity 70a is provided with an air inlet end for the air inlet of the auxiliary air cavity 70a, and the auxiliary air in the auxiliary air cavity 70a enters the combustion chamber and mixes with the main airflow in the combustion chamber to form a more powerful rotational flow, so that the fuel spray and the air have a more intense mixing and shearing effect, further promoting the breaking, atomization and evaporation of the liquid droplets and the mixing of the fuel and the air, the radial air inlet can also force the flame length to be shortened and gathered to the center, so that the fuel is fully burned and the combustion rate is improved; the auxiliary air inlet hole 701 is multiple and circumferentially distributed, and is located downstream of the outlet plane of the nozzle; in the application, the auxiliary air inlet hole 701 is arranged in multiple rows along the axial direction of the combustion chamber, and preferably arranged at equal intervals in the axial direction, each row of auxiliary air inlet holes 701 is multiple and circumferentially distributed; in the embodiment, the auxiliary air inlet hole 701 is 2-5 rows and arranged at equal intervals along the axial direction, that is, the distance between the adjacent two rows of auxiliary air inlet holes is the same, and preferably the distance between the adjacent two rows of auxiliary air inlet holes 701 is 1.5-2 times the diameter of the auxiliary air inlet hole, wherein the diameter of the auxiliary air inlet hole 701 is 3-10 mm, and the number of holes in each row of auxiliary air inlet holes is 12-36; the air entering the combustion chamber I from the auxiliary air cavity 70a is radial air, which mixes with the original airflow in the combustion chamber after entering the combustion chamber I, and due to the circumferential distribution of the cylindrical side wall hole, the airflow of different orifices will have different radial velocity components along the cylindrical side wall after entering the cylindrical body, which finally leads to the overall rotational motion of the airflow, generating a rotational flow. Due to the rotational flow in the combustion chamber I itself, under the action of airflow inertia, the airflow will try to maintain the original motion direction according to its own momentum, thereby promoting the formation of rotational flow and mixing with the initial airflow to form a strong rotational flow; at the same time, due to the radial air inlet, the flame length can be shortened and gathered to the center, realizing the stable control of the flame, at the same time, the fuel is fully mixed with oxygen and burned, and more energy is released, so that the flame temperature is increased, at this time the flame gradually changes into a fully burned blue flame, which can also reduce or avoid the generation of carbon deposition.

[0061] The shell comprises a combustion cylinder 8 and a wind cylinder 4, the combustion cylinder 8 is a cylinder with two open ends, the wind cylinder 4 is coaxially arranged with the combustion cylinder 8 and is installed at the head (upstream) of the combustion cylinder 8, the combustion chamber and the auxiliary air cavity 70a are arranged in the combustion cylinder 8, and an inner wind cylinder 43 is arranged in the wind cylinder 4, the inner wind cylinder 43 is coaxial with the wind cylinder 4, and the inner wind cylinder 43 further divides the inside of the wind cylinder 4 into coaxial inner and outer cavities, wherein the inner cavity is the main air inlet cavity 40a, and the outer cavity is the auxiliary air inlet cavity 40b, the auxiliary air inlet cavity 40b is a circular ring and is located outside the main air inlet cavity 40a, the two are coaxial and located on the same radial plane, the end of the auxiliary air inlet cavity is communicated with the auxiliary air cavity for air supply (air), and the auxiliary air inlet hole 401 is arranged on the side wall of the wind cylinder, the air inlet direction of the auxiliary air inlet hole 401 is tangent to the inner wall of the auxiliary air inlet cavity 40b, so that a rotational flow is formed to reduce the wind resistance and wind noise.

[0062] A flow regulation plate 5 is arranged between the auxiliary air inlet cavity 40b and the auxiliary air cavity 70a, the flow regulation plate 5 is a circular plate body, a center hole 50 is arranged in the center of the flow regulation plate 5 to form a circular ring structure, the flow regulation plate 5 is located between the auxiliary air inlet cavity 40b and the auxiliary air cavity 70a, a flow regulation hole 501 is arranged on the flow regulation plate 5, the auxiliary air inlet cavity 40b and the auxiliary air cavity 70a are communicated through the flow regulation hole 501, the flow regulation hole 501 is a plurality of and is circumferentially distributed, the flow regulation hole 501 adjusts the airflow and reduces the turbulence to make the airflow more stable, the flow regulation plate 5 is designed to optimize the distribution of the airflow and achieve flow regulation; the flow regulation hole 501 is a plurality of rows (circles), preferably 2-5 rows, the number of flow regulation holes 501 in each row is 24-48, and the plurality of flow regulation holes 501 are sequentially arranged along the diameter direction of the flow regulation plate 5, preferably, when the number is 3 rows or more, the distance between the adjacent two rows of flow regulation holes 501 is equal, and the distance between the adjacent two rows of flow regulation holes 501 is 1.5-2 times the diameter of the flow regulation hole, in the embodiment, the diameter of the flow regulation hole 501 is 2mm-4mm, through the above-mentioned flow regulation hole arrangement, the uniformity and stability of the airflow are significantly improved, so that the airflow can enter the auxiliary air cavity uniformly and stably to prepare for uniform entry into the combustion chamber; along the diameter direction of the flow regulation plate, the farther from the center, the larger the diameter, therefore, in order to further improve the stability of the airflow, in the embodiment, the number of flow regulation holes located in the outer circle is greater than the number of flow regulation holes located in the inner circle.

[0063] The swirl generator 6 is fixedly installed at the center of the rectifier plate 5, and specifically, the swirl generator 6 comprises a circular swirl plate, a central hole of the swirl plate is provided with a hole 60 as a nozzle mounting hole for mounting the nozzle 3, and a plurality of swirl hole groups 601 are uniformly distributed on the swirl plate in the circumferential direction, each swirl hole group 601 comprises a main hole 6011 and a secondary hole 6012 arranged at one side of the main hole 6011, and the diameter of the secondary hole is smaller than that of the main hole 6011, so that a pressure difference can be generated to form a rotating airflow, the secondary holes 6012 on the same swirl hole group are multiple and unevenly distributed, the number of the secondary holes 6012 is 2-5, and the secondary holes are arranged at one side of the main hole, and the multiple secondary holes can be holes with different diameters, and the uneven distribution of the secondary holes on both sides of the main hole relies on the airflow velocity difference to generate a pressure difference and form a rotating airflow.

[0064] The inner cylinder 7 is coaxially arranged in the combustion cylinder 8, the head of the combustion cylinder 8 and the inner cylinder 7 is fixed on the circular ring-shaped rectifier plate 5, the tail of the inner cylinder 7 is radially bent by 90 degrees and forms a baffle ring 72, the edge of the baffle ring 72 is attached to the inner wall of the combustion cylinder 8 or has a certain gap, the gap is 0.5-1 mm, which not only facilitates assembly, but also forms an annular air supply channel to provide air for the downstream flame and improve the combustion rate; the inner cylinder 7 divides the combustion cylinder 8 into a combustion chamber I 70b, a combustion chamber II 80 and an auxiliary air cavity 70a, wherein the combustion chamber I 70b is located at the upstream, the combustion chamber II is located at the downstream, the end of the combustion chamber I 70b is open and communicates with the combustion chamber II and can contain the tail of the flame to enter the combustion chamber II, the auxiliary air cavity is located at the outer side of the combustion chamber I and the auxiliary air inlet hole 701 is arranged on the side wall of the inner cylinder 7; at the same time, air holes can be arranged on the baffle ring, the air holes are multiple and uniformly distributed on the baffle ring in the circumferential direction, the air holes communicate with the combustion chamber II 80 and provide air for the rear-end flame to realize combustion support, and the diameter of the air holes is 2-5 mm; in order to ensure the stability of air supply and avoid turbulence, in the embodiment, the air holes are 1-5 rows and are arranged in sequence along the diameter direction of the combustion chamber II 80; in order to ensure the air inlet amount of the auxiliary air inlet hole, in the application, the total area of the air holes is smaller than the total area of the auxiliary air inlet hole 701.

[0065] The following will be described in detail, the small fuel swirl combustion device with air assisting structure of the utility model, including coaxial arrangement's end cap 1, nozzle mounting seat 2, nozzle 3, air cylinder 4, rectifier plate 5, swirl generator 6, inner cylinder 7 and combustion cylinder 8.

[0066] Referring to Figures 8-9, the air duct 4 is a cylinder, which includes a cylindrical outer air duct 41, the head of the outer air duct 41 is radially bent 90 degrees to form a circular annular first connecting part, the first connecting part is provided with a mounting hole to form a first flange 411, the tail of the outer air duct 41 is bent 90 degrees inward to form an end face 42, the edge of the end face extends axially, specifically, extends (bends) toward the first flange 411 to form an inner air duct 43, the inner air duct 43 is coaxial with the outer air duct, both are cylindrical bodies and have a certain distance between each other to form an annular chamber with one end open, which is used to form a secondary air inlet chamber 40b, the edge of the inner air duct 41 is radially bent inward to form a second connecting part, the second connecting part is provided with a mounting hole to form a second flange 431, the second flange is located in the same plane as the first flange; a lug 432 is arranged on the inner wall of the inner air duct, the lug is provided with a mounting hole for fixing the nozzle mounting seat 2, an air inlet pipe is arranged on the side wall of the outer air duct 41, the inlet end of the air inlet pipe forms a secondary air inlet hole 401, the air inlet pipe is tangent to the inner wall of the outer air duct, which enables the air to enter the secondary air inlet chamber 40b in a tangential direction, further optimizes the air flow, and reduces the wind noise.

[0067] Referring to Figures 17-18 , the end cover 1 is a cylinder with one end open, which forms a chamber 10 inside, the diameter of the chamber 10 is slightly larger than the diameter of the inner air duct, the end cover 1 is fixed to the end of the air duct 4, specifically, the head of the end cover is radially bent 90 degrees to form a third connecting part, the third connecting part is provided with a mounting hole and forms a third flange, the third flange is fixed to the end face of the air duct, which is in communication with the inner air duct to form a main air inlet chamber, the end cover 1 is provided with a main air inlet hole 101 at the end, which is coaxially arranged with the combustion chamber, the nozzle and the swirl generator, the main air inlet hole 101 serves as a main air inlet end, therefore, the end cover serves as a main air duct.

[0068] Referring to Figures 13-14The rectifier plate 5 is a whole circular ring, the inner diameter of which is the same as the outer diameter of the first flange 411, the inner diameter of which is the same as the inner diameter of the second flange 431, and the rectifier plate 5 is fixed on the first flange 411 and the second flange 431, which forms a secondary air inlet cavity 40b between the outer air cylinder 41 and the inner air cylinder 43, and a plurality of rectifier holes 501 are arranged on the rectifier plate 5 and are uniformly distributed in the circumferential direction, which are used for connecting the auxiliary air cavity 70a at the rear end (downstream) of the rectifier plate 5. The rectifier holes 501 are used for adjusting airflow and reducing turbulence, so that the airflow is more stable and the airflow is rectified. The rectifier holes 501 are arranged in multiple rows (circles), preferably 2-5 rows, and the number of holes in each row of rectifier holes 501 is 24-48, and the multiple rows of rectifier holes 501 are sequentially arranged along the diameter direction of the rectifier plate 5. When the number of rows is 3 or more, the distance between adjacent rows of rectifier holes 501 is equal, and the distance between the adjacent two rows of rectifier holes 501 is 1.5-2 times the diameter of the rectifier hole. In this embodiment, the diameter of the rectifier hole 501 is 2mm-4mm, that is, the rectifier hole is radially arranged on the rectifier plate 5. In this application, the first annular protrusion 51 and the second annular protrusion 52 are arranged on the end surface of the rectifier plate 5, the first annular protrusion 51 and the second annular protrusion 52 are coaxially arranged, and the first annular protrusion 51 is located outside the second annular protrusion 52, which are located at the rear end of the rectifier plate and are used for mounting and positioning the combustion cylinder and the inner cylinder body. The rectifier holes 501 are located between the first annular protrusion and the second annular protrusion.

[0069] Referring to Figures 10-11 The nozzle mounting seat 2 is fixed in the inner air cylinder 43. Specifically, the nozzle mounting seat 2 comprises a cylindrical mounting body 21, a mounting hole for mounting the nozzle 3 is arranged at the end of the mounting body, a circular ring-shaped mounting bracket ring 22 is arranged at the rear end of the mounting body, the mounting bracket ring 22 is fixedly connected with the mounting body 21 through a plurality of connecting rods 23, a mounting hole is arranged on the mounting bracket ring 22, which corresponds to the lug in the inner air cylinder 43 and is fixed on the lug through a bolt, thereby realizing the fixed mounting of the nozzle mounting seat 2 in the air cylinder. The mounting body 21 is coaxially arranged with the air cylinder, and the nozzle is mounted on the mounting body 21, the injection end of the nozzle faces away from the end cover, and the nozzle is coaxial with the air cylinder.

[0070] Referring to Figures 11-12, the cyclone generator 6 is a circular plate structure, which is arranged at the center of the air outlet end of the inner air duct, and the diameter thereof matches the diameter of the inner air duct. Specifically, the cyclone generator 6 is provided with a central hole, and the inner wall of the central hole extends axially towards the air duct to form a sleeve structure 61, which can be sleeved on the mounting seat body 21 of the nozzle mounting seat and can accommodate the nozzle 3. After assembly, the nozzle 3 is located in the combustion chamber I, so that the jet direction of the nozzle matches the cyclone direction generated by the cyclone generator 6, so as to achieve the purpose of optimizing the airflow distribution and improving the combustion efficiency. In the present application, the cyclone plate is circumferentially uniformly distributed with a cyclone hole group 601, which includes a main hole 6011 and a secondary hole 6012 arranged on one side of the main hole 6011. The diameter of the secondary hole is smaller than that of the main hole 6011, so that a pressure difference can be generated to form a rotating airflow. The secondary hole 6012 is multiple and unevenly distributed, preferably 2-5. The secondary hole 6012 is arranged on one side of the main hole, and the distribution of the secondary hole on both sides of the main hole is uneven. By relying on the difference in air flow rate, a pressure difference is generated to form a rotating airflow. The cyclone generator is used to form a cyclone coaxial with the nozzle, improve the strength and stability of the rotating airflow, and thus improve the combustion efficiency. When the gas passes through the cyclone generator, the large hole and the small hole will cause different resistances to the airflow. Since the large hole is wider than the small hole, the resistance of the airflow through the large hole is smaller, and the speed is faster. The resistance of the airflow through the small hole is larger, and the speed is slower, forming uneven speed distribution. Due to the difference in airflow speed, different pressures are formed at the large hole and the small hole. The pressure on one side of the outlet end of the large hole is slightly lower, and the pressure on one side of the outlet end of the small hole is slightly higher. This pressure difference constitutes a pressure difference to form a cyclone. At the same time, the above-mentioned cyclone hole group 601 is an inclined hole, that is, the main hole 6011 and the secondary hole 6012 are inclined holes, which are directed in the same direction. The inclined hole cooperates with the pressure difference of the large hole and the small hole to form a more stable and strong cyclone. In addition, the design of the cyclone generator 6 can effectively reduce the airflow noise during combustion and improve the working environment.

[0071] Referring to Figures 3-6 , the combustion cylinder 8 is a cylindrical structure, both ends of which are bent radially outward to form a flange structure, and the end portion is fixedly installed on the straightening plate 5. The inner side thereof is in contact with the first annular protrusion 51 on the straightening plate 5 to realize rapid radial positioning and ensure stable installation of the combustion cylinder.

[0072] Referring to Figures 15-16The inner cylinder 7 is arranged in the combustion cylinder 8 and coaxial with the combustion cylinder 8. Specifically, the inner cylinder 7 comprises an inner cylinder body 71, both ends of which are penetrated by a through hole 70 to form a cylindrical structure, the diameter of which is smaller than that of the combustion cylinder, and the length of which is smaller than that of the combustion cylinder, specifically, the length of which is 1 / 3-1 / 2 of the length of the combustion cylinder, the head of which is radially outwardly bent to form a fourth connecting part, and a mounting hole is formed in the fourth connecting part to form a fourth flange 73, the fourth flange 73 is fixedly installed on the rectifier plate, and the inner wall thereof is in contact with the second annular protrusion 52 on the rectifier plate to realize fast and accurate radial positioning and maintain the installation stability of the inner cylinder 7; the tail of the inner cylinder body 71 is radially outwardly bent by 90 degrees to form a retaining ring 72, the edge of the retaining ring 72 is in contact with the inner wall of the combustion cylinder 8 or has a certain gap of 0.5-1 mm, which not only facilitates assembly, but also forms an annular air supply channel to provide air for the downstream flame and improve the combustion rate; the inner cylinder 7 divides the combustion cylinder 8 into a combustion chamber I 70b, a combustion chamber II 80 and an auxiliary air cavity 70a. Specifically, the outer wall of the inner cylinder 7, the retaining ring and the inner wall of the combustion cylinder 8 form the auxiliary air cavity 70a, the inner cylinder 7 forms the combustion chamber I 70b, and the outer side (rear end) of the retaining ring and the inner wall of the combustion cylinder 8 form the combustion chamber II 80, which is located downstream of the combustion chamber I, and the diameter of the combustion chamber II 80 is greater than that of the combustion chamber I 70b; the auxiliary air inlet hole 701 is formed in the side wall of the inner cylinder 7, specifically, it is arranged at the rear end (downstream) of the combustion chamber I; at the same time, air holes can be arranged on the retaining ring 72, the air holes are multiple and uniformly distributed on the retaining ring in the circumferential direction, which communicate with the combustion chamber II 80 to provide air for the rear flame and realize combustion support, and the diameter of the air holes is 2-5 mm; in order to ensure the stability of air supply and avoid turbulence, the air holes in the embodiment are 1-5 rows and are arranged along the diameter direction of the combustion chamber II 80.

[0073] The utility model discloses a small -size fuel oil whirl combustion device with wind -assisting structure, including combustion chamber, air intake structure, whirl structure and oil nozzle structure, and its working process is as follows: supply fuel oil and main stream air (main air inlet cavity) first, and fuel oil is sprayed out through nozzle 3, and the main stream air forms the rotating air flow after whirl generator and enters combustion chamber I, and under the action of whirl air, makes the full mixture of the liquid drop and air in combustion chamber I, in order to improve the ignition success rate, and the oil gas is relatively high, and the oil gas is ignited through the ignition device, but the oil gas is relatively high at this time, and the combustion is not complete, and the flame is the orange red of diffusion, and then, adjust the main stream air intake, gradually increase the main stream air intake, and begin to supply the air intake amount of wind -assisting (auxiliary air chamber), and the secondary air intake enters the auxiliary air chamber 70a outside combustion chamber I after the rectifier plate, and after the rectification of the rectification hole on the rectifier plate, enters the auxiliary air chamber 70a, and enters combustion chamber I through the auxiliary air inlet hole on the inner cylinder, and the combustion chamber I is as the main combustion zone, and the baffle structure of the inner cylinder end portion can better force the wind to enter combustion chamber I along the tangential ring hole, and mixes with the central whirl main stream, strengthens the whirl process of main stream, makes fuel spray and air more intense mixing and shearing effect, further promotes the breakage, atomization and evaporation of liquid drop and the mixture of fuel and air, and the air -assisting of radial air intake can force the flame length to shorten and gather to the center, and the flame gradually changes into the blue flame of complete combustion at this time, the utility model discloses a small -size fuel oil whirl combustion device with wind -assisting structure, and the main stream air intake and the air -assisting amount are controlled through reasonable flow field, and the whirl combustion flow field distribution of liquid fuel is regulated and controlled, realizes the efficient complete combustion of liquid fuel in small space range, and reduces or avoids the emission of harmful gas.

[0074] The above only is the preferred implementation of the utility model, should point out, for ordinary technical personnel in this technical field, under the premise of not departing from the technical principle of the utility model, can also make a number of improvements and refinements, these improvements and refinements also should be regarded as the protection range of the utility model.

Claims

1. A small-sized fuel whirl combustion device with an air assisting structure, characterized by comprising: The application relates to a shell, which is internally formed with coaxial combustion chambers, a main air inlet cavity and an auxiliary air cavity, the main air inlet cavity is arranged at the front end of the combustion chamber and communicates with the combustion chamber, the auxiliary air cavity is annular and is arranged outside the combustion chamber, and auxiliary air inlets are arranged on the side wall of the combustion chamber and communicate with the auxiliary air cavity. A swirl generator is arranged between the main air inlet cavity and the combustion chamber, and can make the air discharged from the main air inlet cavity generate swirl and then enter the combustion chamber. A nozzle is arranged in the combustion chamber coaxially with the swirl generator and is used for oil injection. An igniter is arranged in the combustion chamber downstream of the nozzle and is used for ignition. The combustion chamber comprises combustion chamber I and combustion chamber II which are coaxially arranged and communicate with each other, the combustion chamber II is located downstream of the combustion chamber I and has a diameter larger than that of the combustion chamber I, the nozzle is arranged upstream of the combustion chamber I and faces the combustion chamber II, and the auxiliary air inlets are arranged on the side wall of the combustion chamber I.

2. The small-sized fuel whirl combustion device with air assisting structure according to claim 1, characterized in that: The auxiliary air inlets are multiple and are circumferentially and uniformly arranged and located downstream of the outlet plane of the nozzle.

3. The small-sized fuel whirl combustion device with air assisting structure according to claim 1, characterized in that: The shell comprises a combustion cylinder with two open ends and a wind cylinder mounted on the head of the combustion cylinder, the combustion chamber and the auxiliary air cavity are arranged in the combustion cylinder, an inner wind cylinder is coaxially arranged in the wind cylinder and forms the main air inlet cavity and a secondary air inlet cavity which communicates with the auxiliary air cavity, a secondary air inlet is arranged on the side wall of the secondary air inlet cavity, and the air inlet direction of the secondary air inlet is tangent to the inner wall of the secondary air inlet cavity and forms swirl.

4. The small-sized fuel whirl combustion device with air assisting structure according to claim 1, characterized in that: A circular annular flow regulation plate is arranged between the secondary air inlet cavity and the auxiliary air cavity, the flow regulation plate is circumferentially and uniformly provided with flow regulation holes and realizes the communication between the secondary air inlet cavity and the auxiliary air cavity.

5. The small-sized fuel whirl combustion device with air assisting structure according to claim 4, characterized in that: The swirl generator comprises a circular swirl plate, a nozzle mounting hole for mounting the nozzle is arranged on the central hole of the swirl plate, a swirl hole group is circumferentially and uniformly arranged on the swirl plate, the swirl hole group comprises a main hole and a secondary hole arranged on one side of the main hole, the diameter of the secondary hole is smaller than that of the main hole and can generate pressure difference and then form rotating air flow.

6. The small-sized fuel rotating flame combustion device with air assisting structure according to claim 1, characterized in that: The secondary holes are multiple and are unevenly distributed.

7. The small-sized fuel rotating flame combustion device with air assisting structure according to claim 6, characterized in that: An inner cylinder is coaxially arranged in the combustion cylinder, a circular annular flow regulation plate is fixed on the head of the combustion cylinder and the inner cylinder, the tail of the inner cylinder is radially and outwardly bent and forms a blocking ring, thereby separating the combustion cylinder into combustion chamber I, combustion chamber II and an auxiliary air cavity, and the auxiliary air inlets are arranged on the side wall of the inner cylinder.

8. The small-sized fuel rotating flame combustion device with air assisting structure according to claim 4, characterized in that: The main hole and / or the secondary hole are inclined holes.

9. The small-sized fuel rotating flame combustion device with air assisting structure according to claim 6, characterized in that: The blocking ring is circumferentially and uniformly provided with air holes which communicate with the combustion chamber II.

10. The small-sized fuel rotating flame combustion device with air assisting structure according to claim 8, characterized in that: ​

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