阅读说明：本技术 一种具有防止燃油流量衰减的发动机电嘴 (Engine electric nozzle capable of preventing fuel flow attenuation ) 是由 李星星 曹秀梅 吴星 于 2019-11-13 设计创作，主要内容包括：本申请提供了一种具有防止燃油流量衰减的发动机电嘴,包括：中心油管组件、螺纹油滤、喷嘴、中心电极及侧电极,喷嘴与中心油管组件之间没有封严圈；侧电极套在中心电极外,并固定在电嘴壳体上,所述侧电极与所述电嘴壳体之间设置有调整垫圈。本申请取消了喷嘴与中心油管组件之间的封严圈,防止因封严圈使用变形的因素导致油液流量发生变化的问题,使得发动机起动点火不会随使用时间变长而影响点火成功率。(The application provides an engine electric nozzle with prevent fuel flow decay, includes: the device comprises a central oil pipe assembly, a thread oil filter, a nozzle, a central electrode and a side electrode, wherein a sealing ring is not arranged between the nozzle and the central oil pipe assembly; the side electrode is sleeved outside the central electrode and fixed on the electric nozzle shell, and an adjusting gasket is arranged between the side electrode and the electric nozzle shell. This application has cancelled the circle of obturating between nozzle and the central oil pipe subassembly, prevents to use the problem that the factor of deformation leads to fluid flow to change because of the circle of obturating for engine start ignition can not be as the live time lengthens and influence the success rate of igniteing.)

1. An engine electric nozzle with fuel flow attenuation prevention, comprising:

the central oil pipe assembly (1) is fixed in the electric nozzle shell (2);

the threaded oil filter (3) is fixed at the outlet end of the central oil pipe assembly (1) and is provided with an extension part extending out of the end part of the threaded oil filter (3);

the nozzle (4) is used for accommodating the extension part of the threaded oil filter (3) and is butted with the end part of the central oil pipe assembly (1), the end part of the nozzle (4) butted with the central oil pipe assembly (1) is subjected to polishing treatment, and a sealing ring is not arranged between the nozzle (4) and the central oil pipe assembly (1);

the inner wall of the central electrode (5) is provided with a step surface, and when the central electrode (5) is in threaded connection with the central oil pipe assembly (1), the nozzle (4) is pressed on the end surface of the central oil pipe assembly (1) by the step surface;

the side electrode (6) is sleeved outside the central electrode (5) and fixed on the electric nozzle shell (2), and an adjusting gasket (7) is arranged between the side electrode (6) and the electric nozzle shell (2);

the central electrode (5) is provided with a first window, the side electrode (6) is provided with a second window, the length of the central oil pipe assembly (1) and the thickness of the adjusting washer (7) are set, and the overlapping gap between the first window and the second window relative to the outlet end of the nozzle (4) is 2.2 min.

2. The electric nozzle of engine with prevention of fuel flow attenuation of claim 1, characterized in that the length of the central fuel pipe assembly (1) is increased by 0.3mm after the seal ring is removed.

3. The electric nozzle for an engine having the function of preventing the fuel flow from decaying as claimed in claim 2, wherein the thickness of the adjusting washer is 0.3-0.6 mm.

4. The electric nozzle of engine with function of preventing fuel flow attenuation as claimed in claim 1, characterized in that the surface roughness Ra of the end of the nozzle (4) butted with the central fuel pipe assembly (1) is polished to be less than or equal to 0.8 um.

5. The electric nozzle of engine with prevention of fuel flow attenuation of claim 1, characterized in that the center electrode (5) is welded after being screwed on the center oil pipe assembly (1).

6. The engine electric nozzle capable of preventing fuel flow from being attenuated according to claim 1, characterized in that the side electrode (6) is provided with an external thread, the opening of the electric nozzle shell (2) is provided with an internal thread, the root of the external thread of the side electrode (6) is provided with an annular fin, when the side electrode (6) is screwed with the electric nozzle shell (2), the annular fin moves towards the opening end surface of the electric nozzle shell (2), and the adjusting gasket (7) is positioned between the annular fin and the opening end surface of the electric nozzle shell (2).

Technical Field

The invention belongs to the technical field of engine ignition design, and particularly relates to an engine electric nozzle capable of preventing fuel flow attenuation.

Background

FIG. 1 is current electric mouth oil circuit structure sketch map, and this electric mouth is the torch electric mouth, and the torch electric mouth adopts pressure type nozzle 4 to be the haplopore nozzle, and the atomizing is hollow awl, and the most important design index that influences the atomizing of torch electric mouth is atomizing angle, and the core component that influences atomizing angle strains 3 for nozzle 4 and screw thread oil, and screw thread oil strains 3 and adjusts torch electric mouth flow and atomization effect through the whirl groove pressure boost, and straight line length influences atomizing angle in 4 interior taper angle angles of nozzle and the nozzle 4.

In the torch electric nozzle, fuel oil with the pressure of 0.392MPa flows into the torch electric nozzle shell from the pipe joint, is sprayed out from the nozzle 4 to form an atomizing taper angle after passing through the inner cavity of the central oil pipe component 1 and the special threads of the threaded oil filter 3, the central electrode and the side electrode are respectively provided with three windows along the circumferential direction, and oil mist is sprayed out from the three windows of the central electrode and the side electrode after being sprayed out from the nozzle of the nozzle 4. The electric nozzle is connected with an ignition coil, when the power supply is switched on, the end part of the central electrode and the plum petals of the side electrodes discharge, atomized fuel is ignited, and a torch is formed.

Along with the increase of the service life of the engine, the problems that the engine is difficult to start and ignite and the like exist along with the increase of the use frequency of warfare training in the use process of the engine.

Disclosure of Invention

In order to solve at least one of the above technical problems, the present application provides an electric nozzle of an engine having a function of preventing a fuel flow from being attenuated, including:

the central oil pipe assembly is fixed in the electric nozzle shell;

the threaded oil filter is fixed at the outlet end of the central oil pipe assembly and is provided with an extension part extending out of the end part of the threaded oil filter;

the nozzle is used for accommodating the extension part of the threaded oil filter and is butted with the end part of the central oil pipe assembly, the end part of the nozzle butted with the central oil pipe assembly is subjected to polishing treatment, and a sealing ring is not arranged between the nozzle and the central oil pipe assembly;

the inner wall of the central electrode is provided with a step surface, and when the central electrode is in threaded connection with the central oil pipe assembly, the step surface presses the nozzle onto the end surface of the central oil pipe assembly;

the side electrode is sleeved outside the central electrode and fixed on the electric nozzle shell, and an adjusting gasket is arranged between the side electrode and the electric nozzle shell;

the center electrode is provided with a first window, the side electrode is provided with a second window, the length of the center oil pipe assembly and the thickness of the adjusting washer are set, and the coincidence gap between the first window and the second window relative to the outlet end of the nozzle is 2.2 min.

Preferably, the length of the center tubing assembly is increased by 0.3mm after the seal ring is removed.

Preferably, the thickness of the adjustment washer is 0.3 to 0.6 mm.

Preferably, the surface roughness Ra of the end part of the nozzle, which is butted with the central oil pipe assembly, after polishing treatment is less than or equal to 0.8 um.

Preferably, the center electrode is welded and fixed after being screwed on the center oil pipe assembly.

Preferably, the side electrode is provided with an external thread, an internal thread is arranged at the opening of the electric nozzle shell, an annular fin is arranged at the root of the external thread of the side electrode, the annular fin moves towards the opening end face of the electric nozzle shell when the side electrode is in threaded connection with the electric nozzle shell, and the adjusting washer is positioned between the annular fin and the opening end face of the electric nozzle shell.

This application has cancelled the circle of obturating between nozzle and the central oil pipe subassembly, prevents to use the problem that the factor of deformation leads to fluid flow to change because of the circle of obturating for engine start ignition can not be as the live time lengthens and influence the success rate of igniteing.

Drawings

Fig. 1 is a schematic structural view of an oil nozzle of a conventional ignition torch.

Fig. 2 is a schematic structural view of an ignition torch according to an embodiment of the present application.

Fig. 3 is an enlarged schematic view of the structure of the ignition nozzle of the embodiment shown in fig. 2 of the present application.

The method comprises the following steps of 1-a central oil pipe assembly, 2-an electric nozzle shell, 3-a thread oil filter, 4-a nozzle, 5-a central electrode, 6-a side electrode, 7-an adjusting gasket, 8-a sealing ring and 9-a pipe joint.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application, and should not be construed as limiting the present application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application. Embodiments of the present application will be described in detail below with reference to the drawings.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention.

The invention provides an engine electric nozzle capable of preventing fuel flow attenuation, as shown in fig. 2 and 2, mainly comprising:

the central oil pipe assembly 1 is fixed in the electric nozzle shell 2;

the threaded oil filter 3 is fixed at the outlet end of the central oil pipe assembly 1 and is provided with an extension part extending out of the end part of the threaded oil filter 3;

the nozzle 4 is used for accommodating the extension part of the threaded oil filter 3 and is butted at the end part of the central oil pipe assembly 1, the end part of the nozzle 4 butted with the central oil pipe assembly 1 is subjected to polishing treatment, and a sealing ring is not arranged between the nozzle 4 and the central oil pipe assembly 1;

the inner wall of the central electrode 5 is provided with a step surface, and when the central electrode 5 is in threaded connection with the central oil pipe assembly 1, the step surface presses the nozzle 4 on the end surface of the central oil pipe assembly 1;

the side electrode 6 is sleeved outside the central electrode 5 and fixed on the electric nozzle shell 2, and an adjusting gasket 7 is arranged between the side electrode 6 and the electric nozzle shell 2;

the central electrode 5 is provided with a first window, the side electrode 6 is provided with a second window, and the length of the central oil pipe assembly 1 and the thickness of the adjusting washer 7 are set so that the overlapping gap between the first window and the second window relative to the outlet end of the nozzle 4 is 2.2 min.

In some alternative embodiments, the length of the center tubing assembly 1 is increased by 0.3mm after the seal ring is removed.

In some alternative embodiments, the thickness of the adjustment washer is 0.3-0.6 mm.

In some alternative embodiments, the surface roughness Ra of the end of the nozzle 4 butted with the central oil pipe assembly 1 is less than or equal to 0.8um after polishing treatment.

In some alternative embodiments, the center electrode 5 is welded and fixed after being threaded onto the center tubing assembly 1.

In some optional embodiments, the side electrode 6 is provided with an external thread, the opening of the nozzle housing 2 has an internal thread, the root of the external thread of the side electrode 6 is provided with an annular fin, when the side electrode 6 is screwed with the nozzle housing 2, the annular fin moves towards the opening end face of the nozzle housing 2, and the adjusting washer 7 is located between the annular fin and the opening end face of the nozzle housing 2.

The principles of the present invention are described below.

Fig. 1 is a structural schematic diagram of an oil nozzle of an existing ignition electric nozzle, fuel oil enters from a threaded oil filter center and then flows out of two small holes, and after acceleration through special threads at the end part, the fuel oil is discharged from the nozzle small holes to form atomization, and the factors mainly influencing the flow of products are as follows: the tooth shape depth of the special thread of the thread oil filter and the diameter of the small hole of the nozzle.

After the central electrode and the central oil pipe assembly are in threaded connection and tightly press the nozzle, the nozzle is fixed in a spot welding mode, a fastening cavity is formed by the nozzle, the sealing ring and the central electrode, and the thermal expansion amount in the fastening cavity is theoretically calculated as follows:

the nozzle is made of 1Cr18Ni9Ti stainless steel, and has a linear expansion coefficient α of 18.2 x 10 at 20-600 deg.C^-6℃^-1Axial elongation Δ L₁＝L₁αΔt＝4.5mm×18.2×10^-6℃^-1×580℃＝0.048mm。

The sealing ring is made of T2 copper, and the linear expansion coefficient α is 17.64 multiplied by 10^-6℃^-1Axial elongation Δ L₂＝L₂αΔt＝1.3mm×17.64×10^-6℃^-1×580℃＝0.013mm。

The central electrode material is GH3044 high-temperature alloy, and the linear expansion coefficient α is 13.5 multiplied by 10^-6℃^-1Axial elongation Δ L₃＝L₃αΔt＝5.8mm×13.5×10^-6℃^-1×580℃＝0.045mm。

Thermal expansion amount: Δ L₃-ΔL₂-ΔL₁＝-0.017mm

It is calculated that thermal expansion causes the nozzle to compress 0.017 mm. Thereby cause the circle of obturating to warp, cause the nozzle not hard up, the nozzle is not hard up, strains under the effect of special shape screw thread rotation oil pressure at the screw thread oil, the nozzle rotates, because reasons such as friction when rotating, along with the work of product, the circle surface of obturating rolls, warp through the repetition that rotates the nozzle, the product presents following two kinds of effects:

1) the sealing function is lost, and the product flows out from the sealing ring along the outer side of the nozzle under the oil pressure of 0.4MPa, so that the product flow is increased.

2) The inner hole of the sealing ring becomes small and is clamped on the annular groove of the thread oil filter, so that fuel oil flowing to the nozzle through the oil filter is blocked, and the flow of the product is reduced.

Aiming at the faults, the invention cancels a sealing ring between the nozzle and the central oil pipe. The thickness of the sealing ring is 0.5mm before assembly, and the size of the sealing ring is 0.3-0.4 mm after assembly. The effect can be influenced after the sealing ring is cancelled: a) the tightness between the central oil pipe assembly and the nozzle; b) the relative positions of the center electrode and the side electrode windows are accordingly specifically designed to address the above requirements.

In order to guarantee the sealing performance between the central oil pipe assembly and the nozzle after the sealing ring is removed, the contact surface of the nozzle is polished, and the surface roughness is 0.8, so that the sealing performance can be guaranteed.

In order to ensure the atomization effect of the electric nozzle, the nozzle can be ensured to smoothly spray from the central electrode window and the side electrode window after atomization, and the superposition gap between the side electrode window and the central electrode window is controlled for 2.2min (angle division/arc division).

The superposition gap between the side electrode window and the central electrode window becomes smaller after the sealing ring is removed, the size of the sealing ring after being assembled is 0.3-0.4 mm, the length of the central oil pipe is increased by 0.3mm in the improved structure, and the rest of the sealing ring is adjusted by selecting one of adjusting washers with various specifications or by processing the end face of the side electrode to ensure the gap size between the side electrode window and the central electrode window.

The torch ignition electric nozzle is already used on a torch ignition electric nozzle, and the use effect is good. After the engine is tested for 1000 hours, in the using process, the condition of unsuccessful ignition does not occur, and the product returns to the factory to check that the flow is qualified without change. This application is through the ring of obturating of cancellation between nozzle and the central oil pipe subassembly, prevents to use the problem that the factor of deformation leads to fluid flow to change because of the ring of obturating for engine start-up ignition can not be as the live time lengthens and influence the success rate of igniteing.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.