Fuel nozzle structure with multi-ring nesting

Abstract

The invention relates to the technical field of fuel nozzles, and discloses a fuel nozzle structure with a multi-ring nesting, which comprises a combustion cylinder, the multi-ring nesting is arranged in the combustion cylinder, a plurality of fuel nozzles are arranged in the combustion cylinder through the multi-ring nesting, each fuel nozzle comprises a main pipeline, a sleeve and an oil injection inner pipe, the main pipeline is clamped with the multi-ring nesting, and the sleeve is clamped with the oil injection inner pipe. The sleeve sleeves the upper end of the outer surface of the main pipeline, the oil injection inner pipe is arranged at the lower end in the main pipeline, a plurality of air inlet holes are formed in the side wall of the main pipeline and located at the lower end in the sleeve, an air inlet channel is formed in the space between the sleeve and the main pipeline, and spiral blades are arranged in the air inlet channel. According to the fuel nozzle structure with the multi-ring nesting structure, the spiral blades are arranged, so that airflow entering the air inlet channel can be effectively guided, friction and resistance between the airflow and the inner wall of the nozzle pipeline are reduced, vortex and backflow of the airflow are avoided, the airflow uniformity in the airflow flowing process is guaranteed, and the gas flow is increased.

Description

Technical Field

[0001] The invention relates to the technical field of fuel nozzles, in particular to a fuel nozzle structure with multiple nested rings. Background Art

[0002] A fuel nozzle, also known as an injector, is a device used to spray liquid or gaseous fuel into a combustion chamber. Its main function is to atomize the fuel into fine particles, mix it with air, and then spray it into the combustion chamber to achieve combustion of the fuel.

[0003] When multiple fuel nozzles are installed in the combustion tube, the fuel nozzles are not convenient to be nested and fixed. When the airflow enters the pipeline structure inside the fuel nozzle, the airflow uniformity or the internal mixing effect of the airflow is poor during the flow process. At the same time, it is impossible to effectively guide the airflow to flow smoothly along the inner wall of the nozzle pipeline to reduce the friction and resistance between the airflow and the inner wall of the nozzle pipeline. When the airflow flows in the fuel nozzle pipeline, vortexes and backflows are prone to occur, which reduces the flow rate and easily leads to poor mixing effect of air and fuel, and the temperature distribution uniformity of the combustion chamber cannot be guaranteed. Therefore, it is necessary to provide a fuel nozzle structure with multi-ring nesting to solve the above problems. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a fuel nozzle structure with multiple nested rings, which solves the problems mentioned in the above background.

[0005] The present invention provides the following technical solution: a fuel nozzle structure with multiple nested rings, comprising a combustion tube, wherein multiple nested rings are arranged inside the combustion tube, and multiple fuel nozzles are arranged inside the combustion tube through the nested rings; The fuel nozzle includes a main pipe, a sleeve and an inner injection pipe. The main pipe is nested and clamped with multiple rings. The sleeve is sleeved on the upper end of the outer surface of the main pipe, and the inner injection pipe is arranged at the lower end inside the main pipe. A plurality of air inlet holes are opened on the side wall of the main pipe and located at the lower end inside the sleeve.

[0006] Preferably, the multi-ring nesting includes inner nesting, middle ring nesting and outer ring nesting, the middle ring nesting is arranged between the inner nesting and the outer ring nesting, and a plurality of positioning holes are opened in a circumferential array on the middle ring nesting and the outer ring nesting, and the fuel nozzle is stuck in the positioning hole.

[0007] Preferably, the opening at the upper end of the sleeve expands outward, the space between the sleeve and the main pipeline forms an air inlet channel, and spiral blades are arranged in the air inlet channel.

[0008] Preferably, an external thread is provided at the lower end of the outer surface of the main pipe, and the main pipe is threadedly connected to a fastening nut sleeve via the external thread.

[0009] Preferably, a protective sleeve is provided at the lower end of the fastening nut sleeve, and the fastening nut sleeve and the protective sleeve are detachable.

[0010] Preferably, an expansion section is provided at the front end of the inner fuel injection pipe, and the upper end of the expansion section is connected to the inner wall above the air inlet hole of the main pipeline.

[0011] Preferably, a plurality of fuel injection ports are provided in a circumferential array on the side wall at the lower end of the fuel injection inner tube, and a dispersion ring is sleeved on the lower end of the outer surface of the fuel injection inner tube and located at the fuel injection port.

[0012] Preferably, a swirler is provided at the lower end of the main pipeline and on the outer surface of the inner injection pipe.

[0013] Preferably, a tail pipe is provided at the lower end of the main pipeline, and the lower end of the fuel injection inner pipe extends into the interior of the tail pipe.

[0014] Preferably, the front end of the combustion tube is provided with an outer edge, and a plurality of fixing holes are opened on the outer edge.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The fuel nozzle structure with multi-ring nesting is convenient for installing the fuel nozzle by providing multi-ring nesting and positioning holes, ensuring that the fuel nozzles are evenly distributed. By providing a fastening nut sleeve, the fastening nut sleeve and the protective sleeve are disassembled, and the lower end of the fuel nozzle can be rotated through the positioning hole and limited by the sleeve, and then the fastening nut sleeve is screwed. The fastening nut sleeve cooperates with the sleeve to clamp the multi-ring nesting, ensuring that the position of the fuel nozzle is accurate and stable, and the disassembly and assembly are convenient, which is convenient for later maintenance. The protective sleeve can protect the lower end of the main pipeline.

[0016] 2. The fuel nozzle structure with multiple nested rings can effectively guide the airflow entering the air inlet channel by setting spiral blades, reduce the friction and resistance between the airflow and the inner wall of the nozzle pipe, avoid vortex and backflow of the airflow, ensure the uniformity of the airflow during the flow, increase the gas flow rate, and a plurality of fuel injection ports are arranged in a circular array on the side wall of the lower end of the fuel injection inner tube. A dispersion ring is arranged at the lower end of the outer surface of the fuel injection inner tube and located at the fuel injection port. By setting a plurality of fuel injection ports, the fuel can be evenly sprayed from multiple directions, and the atomization effect of the fuel can be further increased by setting the dispersion ring.

[0017] 3. The fuel nozzle structure with multiple nested rings can be effectively used to guide stable airflow by providing a swirler, so that the flame can burn continuously and stably. By providing a tail pipe, the diameter of the tail pipe is equal to the inner diameter of the main pipe. When the airflow enters the tail pipe through the main pipe, it can have a certain pressurization effect. The increase in air density increases the aerodynamic resistance of the air to the fuel particles, and the oil-gas ratio required for ignition is achieved more quickly, which is beneficial to ignition and can promote fuel atomization to ensure combustion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is one of the overall structural schematic diagrams of the fuel nozzle structure with multiple nested rings of the present invention; Figure 2 The second schematic diagram of the overall structure of the fuel nozzle structure with multiple nested rings of the present invention; Figure 3 It is a schematic diagram of the installation structure of the multi-ring nesting and the fuel nozzle of the present invention; Figure 4 It is a schematic diagram of the installation structure of the multi-ring nesting and the fuel nozzle of the present invention; Figure 5 It is a schematic diagram of the installation structure of the sleeve and the fastening nut sleeve of the present invention; Figure 6 is a cross-sectional view of a fuel nozzle of the present invention; Figure 7 This is a schematic diagram of the installation structure of the fuel injection inner tube and the swirler of the present invention; Figure 8 For the present invention Figure 6 A magnified schematic diagram of the structure at center A; Fig. 9 For the present invention Figure 7 A magnified schematic diagram of the structure at B in the figure.

[0019] In the figure: 1. combustion tube; 101. outer edge; 2. multi-ring nesting; 201. inner nesting; 202. middle ring nesting; 203. outer ring nesting; 204. positioning hole; 3. main pipeline; 301. air inlet; 302. external thread; 4. casing; 5. fastening nut sleeve; 501. protective casing; 6. spiral blade; 7. tail pipe; 8. fuel injection inner pipe; 801. expansion section; 802. fuel injection port; 803. dispersion ring; 9. swirler. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-9 A fuel nozzle structure with multiple ring nesting includes a combustion tube 1, a multiple ring nesting 2 is arranged inside the combustion tube 1, and multiple fuel nozzles are arranged inside the combustion tube 1 through the multiple ring nesting 2; The fuel nozzle includes a main pipe 3, a sleeve 4 and an injection inner pipe 8. The main pipe 3 is clamped with the multi-ring nest 2. The sleeve 4 is sleeved on the upper end of the outer surface of the main pipe 3. The injection inner pipe 8 is arranged at the lower end inside the main pipe 3. A plurality of air inlet holes 301 are opened on the side wall of the main pipe 3 and located at the lower end inside the sleeve 4.

[0022] Among them; the multi-ring nesting 2 includes an inner nesting 201, a middle ring nesting 202 and an outer ring nesting 203. The middle ring nesting 202 is arranged between the inner nesting 201 and the outer ring nesting 203. A plurality of positioning holes 204 are opened in a circular array on the middle ring nesting 202 and the outer ring nesting 203. The fuel nozzle is inserted into the positioning hole 204. By providing the multi-ring nesting 2 and the positioning holes 204, it is easy to install the fuel nozzle and ensure that the fuel nozzle is evenly distributed.

[0023] Among them; the opening at the upper end of the sleeve 4 expands outward, the space between the sleeve 4 and the main pipe 3 forms an air inlet channel, and a spiral blade 6 is arranged in the air inlet channel, and the opening at the upper end of the sleeve 4 expands outward, which is convenient for guiding the air into the air inlet channel. By arranging the spiral blade 6, the airflow entering the air inlet channel can be effectively guided, the friction and resistance between the airflow and the inner wall of the nozzle pipe can be reduced, the airflow can be avoided from vortexing and backflow, the airflow uniformity can be ensured during the flow of the airflow, and the gas flow rate can be increased.

[0024] Among them; an external thread 302 is provided at the lower end of the outer surface of the main pipeline 3, and the main pipeline 3 is threadedly connected with a fastening nut sleeve 5 through the external thread 302. A protective sleeve 501 is provided at the lower end of the fastening nut sleeve 5, and the fastening nut sleeve 5 and the protective sleeve 501 are detachable. After the fastening nut sleeve 5 and the protective sleeve 501 are disassembled, the lower end of the fuel nozzle can be rotated through the positioning hole 204 and limited by the sleeve 4, and then the fastening nut sleeve 5 is screwed on. The fastening nut sleeve 5 and the sleeve 4 cooperate with each other to clamp the multi-ring nest 2, so as to ensure the accurate position and high stability of the fuel nozzle, and convenient disassembly and assembly, and convenient for later maintenance. The protective sleeve 501 can protect the lower end of the main pipeline 3.

[0025] Among them, an expansion section 801 is provided at the front end of the fuel injection inner tube 8, and the upper end of the expansion section 801 is connected to the inner wall above the air inlet hole 301 of the main pipeline 3. A plurality of fuel injection ports 802 are provided in a circular array on the side wall at the lower end of the fuel injection inner tube 8. A dispersion ring 803 is provided at the lower end of the outer surface of the fuel injection inner tube 8 and located at the fuel injection port 802. By providing a plurality of fuel injection ports 802, the fuel can be evenly sprayed from multiple directions. By providing the dispersion ring 803, the atomization effect of the fuel is further increased.

[0026] Among them; a swirler 9 is sleeved on the outer surface of the inner injection pipe 8 at the lower end of the main pipeline 3, and a tail pipe 7 is arranged at the lower end of the main pipeline 3. The lower end of the inner injection pipe 8 extends into the tail pipe 7. The swirler 9 can be effectively used to guide a stable airflow so that the flame can burn continuously and stably. The tail pipe 7 is arranged, and the diameter of the tail pipe 7 is equal to the inner diameter of the main pipeline 3. When the airflow passes through the main pipeline 3 and enters the tail pipe 7, it can have a certain pressurization effect. The increase in air density increases the aerodynamic resistance of the air to the fuel particles, and the oil-gas ratio required for ignition is achieved more quickly, which is beneficial to ignition, and can promote fuel atomization to ensure combustion efficiency.

[0027] Among them, the front end of the combustion tube 1 is provided with an outer edge 101, and a plurality of fixing holes are opened on the outer edge 101. By providing the outer edge 101 and the fixing holes, it is convenient to install and fix the combustion tube 1 to ensure the overall stability.

[0028] Working principle: by providing an outer extension 101 and a fixing hole, it is convenient to install and fix the combustion tube 1 to ensure the overall stability; by providing a multi-ring nest 2 and a positioning hole 204, it is convenient to install the fuel nozzle and ensure that the fuel nozzle is evenly distributed; by providing a fastening nut sleeve 5, the fastening nut sleeve 5 and the protective sleeve 501 are disassembled, the lower end of the fuel nozzle can be rotated through the positioning hole 204 and limited by the sleeve 4, and then the fastening nut sleeve 5 is screwed on, the fastening nut sleeve 5 and the sleeve 4 cooperate with each other to clamp the multi-ring nest 2, ensuring that the position of the fuel nozzle is accurate and stable, easy to disassemble and assemble, and convenient for later maintenance, and the protective sleeve 501 can protect the lower end of the main pipeline 3.

[0029] Furthermore, by providing the spiral blades 6, the airflow entering the air inlet channel can be effectively guided, the friction and resistance between the airflow and the inner wall of the nozzle pipe can be reduced, the vortex and backflow of the airflow can be avoided, the uniformity of the airflow during the flow process can be ensured, the gas flow rate can be increased, and the airflow enters the main pipe 3 through the air inlet hole 301, and then the swirler 9 can be effectively used to guide the stable airflow so that the flame can continue to burn stably.

[0030] Furthermore, a plurality of fuel injection ports 802 are provided in a circular array on the side wall at the lower end of the fuel injection inner tube 8, and a dispersion ring 803 is sleeved on the lower end of the outer surface of the fuel injection inner tube 8 and located at the fuel injection port 802. By providing a plurality of fuel injection ports 802, the fuel can be sprayed evenly from multiple directions. By providing the dispersion ring 803, the atomization effect of the fuel is further increased. By providing the tail pipe 7, the diameter of the tail pipe 7 is equal to the inner diameter of the main pipe 3. When the airflow passes through the main pipe 3 and enters the tail pipe 7, it can have a certain pressurization effect. The increase in air density increases the aerodynamic resistance of the air to the fuel particles, and the oil-gas ratio required for ignition is achieved more quickly, which is beneficial to ignition, and can further promote fuel atomization to ensure combustion efficiency.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fuel nozzle structure with multiple nested rings, comprising a combustion tube (1), characterized in that: The combustion tube (1) is provided with a multi-ring nest (2) inside, and a plurality of fuel nozzles are provided inside the combustion tube (1) through the multi-ring nest (2); The fuel nozzle comprises a main pipe (3), a sleeve (4) and an inner injection pipe (8); the main pipe (3) is clamped with the multi-ring nest (2); the sleeve (4) is sleeved on the upper end of the outer surface of the main pipe (3); the inner injection pipe (8) is arranged at the lower end inside the main pipe (3); and a plurality of air inlet holes (301) are opened on the side wall of the main pipe (3) and located at the lower end inside the sleeve (4).

2. A fuel nozzle structure with multiple nested rings according to claim 1, characterized in that: The multi-ring nesting (2) comprises an inner nesting (201), a middle ring nesting (202) and an outer ring nesting (203); the middle ring nesting (202) is arranged between the inner nesting (201) and the outer ring nesting (203); a plurality of positioning holes (204) are provided in a circumferential array on the middle ring nesting (202) and the outer ring nesting (203); and the fuel nozzle is inserted into the positioning hole (204).

3. A fuel nozzle structure with multiple nested rings according to claim 1, characterized in that: The opening at the upper end of the sleeve (4) expands outwards, and the space between the sleeve (4) and the main pipeline (3) forms an air inlet channel, and a spiral blade (6) is arranged in the air inlet channel.

4. A fuel nozzle structure with multiple nested rings according to claim 1, characterized in that: An external thread (302) is provided at the lower end of the outer surface of the main pipe (3), and the main pipe (3) is threadedly connected to a fastening nut sleeve (5) via the external thread (302).

5. A fuel nozzle structure with multiple nested rings according to claim 4, characterized in that: A protective sleeve (501) is provided at the lower end of the fastening nut sleeve (5), and the fastening nut sleeve (5) and the protective sleeve (501) are detachable.

6. A fuel nozzle structure with multiple nested rings according to claim 5, characterized in that: The front end of the fuel injection inner pipe (8) is provided with an expansion section (801), and the upper end of the expansion section (801) is connected to the inner wall above the air inlet hole (301) of the main pipeline (3).

7. A fuel nozzle structure with multiple nested rings according to claim 6, characterized in that: A plurality of oil injection ports (802) are provided in a circular array on the side wall at the lower end of the oil injection inner tube (8), and a dispersion ring (803) is sleeved on the lower end of the outer surface of the oil injection inner tube (8) and located at the oil injection port (802).

8. A fuel nozzle structure with multiple nested rings according to claim 7, characterized in that: A swirler (9) is sleeved on the lower end of the main pipeline (3) and located on the outer surface of the inner injection pipe (8).

9. A fuel nozzle structure with multiple nested rings according to claim 1, characterized in that: A tail pipe (7) is provided at the lower end of the main pipeline (3), and the lower end of the fuel injection inner pipe (8) extends into the interior of the tail pipe (7).

10. A fuel nozzle structure with multiple nested rings according to claim 1, characterized in that: The front end of the combustion tube (1) is provided with an outer extension edge (101), and a plurality of fixing holes are provided on the outer extension edge (101).

Images