阅读说明：本技术 一种高可靠性喷油器回油连接调节结构 (High-reliability oil injector oil return connection adjusting structure ) 是由 张小勇 孟亮虎 黄大生 魏玉文 于 2021-01-14 设计创作，主要内容包括：本发明属于机械设计技术领域,涉及一种高可靠性喷油器回油连接调节结构。涉及的高可靠性喷油器回油连接调节结构中喷油器采用侧置回油,即喷油器的一侧壁面上设置有与喷油器内部回油孔相贯通的通孔；通孔由内向外依次为盲圆柱孔、锥孔和与锥孔连通的锥形槽；盲圆柱孔连通喷油器内部回油孔；喷油器上套置有定位套；定位套由直径不同的圆柱体Ⅰ、圆柱体Ⅱ构成；圆柱体Ⅰ具有与喷油器间隙配合的圆形通孔；圆柱体Ⅱ的中心具有螺纹孔；螺纹孔内设置有压紧套；压紧套与定位套间隙配合；定位套内焊接有回油管；回油管的后端伸出定位套并在其上套置有压紧螺母。本发明柴油机维护保养,反复拆装不会造成喷油器的损坏,降低了喷油器损坏概率。(The invention belongs to the technical field of mechanical design, and relates to a high-reliability oil injector oil return connection adjusting structure. The oil sprayer in the related oil sprayer oil return connection adjusting structure adopts side oil return, namely a through hole communicated with an oil return hole in the oil sprayer is formed in the wall surface of one side of the oil sprayer; the through hole is sequentially provided with a blind cylindrical hole, a taper hole and a tapered groove communicated with the taper hole from inside to outside; the blind cylindrical hole is communicated with an oil return hole in the oil sprayer; the oil injector is sleeved with a positioning sleeve; the positioning sleeve is composed of a cylinder I and a cylinder II with different diameters; the cylinder I is provided with a circular through hole in clearance fit with the oil sprayer; the center of the cylinder II is provided with a threaded hole; a pressing sleeve is arranged in the threaded hole; the compression sleeve is in clearance fit with the positioning sleeve; an oil return pipe is welded in the positioning sleeve; the rear end of the oil return pipe extends out of the positioning sleeve and is sleeved with the compression nut. The diesel engine provided by the invention can be maintained and repeatedly disassembled and assembled without damaging the oil injector, so that the damage probability of the oil injector is reduced.)

1. The utility model provides a high reliability sprayer oil return connection adjusts structure which characterized in that: the oil injector in the connection adjusting structure adopts side oil return, namely a through hole communicated with an oil return hole in the oil injector is formed in the wall surface of one side of the oil injector; the through hole is sequentially provided with a blind cylindrical hole, a taper hole with gradually expanded diameter from inside to outside and a tapered groove communicated with the taper hole from inside to outside; the bottom surface of the conical groove is a plane, and the diameter of the plane is larger than the maximum diameter of the conical hole; the blind cylindrical hole is communicated with an oil return hole in the oil sprayer; the oil sprayer is sleeved with a positioning sleeve; the positioning sleeve is composed of a cylinder I and a cylinder II with different diameters; the cylinder I of the positioning sleeve is provided with a circular through hole which is in clearance fit with the fuel injector; the diameter of the cylinder II is smaller than that of the cylinder I; the center of the cylinder II is provided with a threaded hole communicated with the circular through hole of the cylinder I; the axis of the threaded hole is perpendicular to the axis of the circular through hole; a pressing sleeve is arranged in the threaded hole of the positioning sleeve; the compression sleeve is in clearance fit with the positioning sleeve; a stepped through hole consisting of a cylindrical hole I and a cylindrical hole II is formed in the compression sleeve; the cylindrical hole I is communicated with an oil return hole in the oil sprayer through the blind cylindrical hole; an oil return pipe is welded in the positioning sleeve; the inner diameter of the oil return pipe is the same as that of the cylindrical hole I and that of an oil return hole in the oil sprayer; the rear end of the oil return pipe extends out of the positioning sleeve and is sleeved with a compression nut; one end of the compression nut is positioned between the compression sleeve and the positioning sleeve and is connected with the positioning sleeve into a whole through threads.

2. The high-reliability oil injector oil return connection adjusting structure as claimed in claim 1, characterized in that: the compression sleeve is of a step columnar structure consisting of a cylinder III, a cylinder IV and a cylinder V which are different in diameter; the diameter of the cylinder III is smaller than that of the blind cylindrical hole of the oil sprayer; the diameter of the cylinder V is larger than that of the cylinder III and smaller than that of the cylinder IV; the end face of the cylinder IV combined with the cylinder III is an end face II combined with the bottom surface of the conical groove of the oil sprayer; the end face of the combination of the cylinder IV and the cylinder V is an end face I used for limiting the axial movement of the compression nut; the diameter of the cylinder IV is smaller than the inner diameter of the threaded hole of the positioning sleeve, so that the compression sleeve can be flexibly adjusted in the threaded hole.

3. The high-reliability oil injector oil return connection adjusting structure as claimed in claim 1, characterized in that: the diameter of the outer circle of the oil return pipe is smaller than the inner diameter of the cylindrical hole II, so that the oil return pipe can be conveniently positioned and welded in the cylindrical hole II.

4. The high-reliability oil injector oil return connection adjusting structure as claimed in claim 1, characterized in that: the compression nut is of a step-shaped columnar structure and is provided with a cylinder VI and a regular hexahedron which is convenient for dismounting the compression nut; the cylinder VI is provided with an external thread matched with the threaded hole of the positioning sleeve.

5. The high-reliability oil injector oil return connection adjusting structure as claimed in claim 1, characterized in that: the interior of the compression nut is a stepped hole formed by a cylindrical hole III and a cylindrical hole IV, the diameter of the cylindrical hole III is larger than that of a cylinder V of the compression sleeve, the diameter of the cylindrical hole III is smaller than that of the cylinder IV, on one hand, the compression nut can be freely and flexibly disassembled, and on the other hand, the end face III of the compression nut is tightly attached to the end face I of the compression sleeve.

6. The high-reliability oil injector oil return connection adjusting structure as claimed in claim 1, characterized in that: an O-shaped ring is arranged between the taper hole of the oil sprayer and the pressing sleeve.

Technical Field

The invention belongs to the technical field of mechanical design, and mainly relates to a high-reliability oil injector oil return connection adjusting structure.

Background

The fuel system is an important component of the diesel engine, and the main function of the fuel system is to inject a certain amount of clean fuel into a combustion chamber according to the rotation speed and load of the diesel engine and the spray shape and quality of certain pressure in a certain time, so that the stroke of mixed gas and the combustion process can be ensured to be carried out under the most favorable conditions. The fuel injector is one of the core parts of the fuel system, fuel entering the fuel injector under the driving of the high-pressure oil pump is injected into the cylinder in an atomized particle state at higher injection pressure, and the shape of the fuel bundle is matched with the shape of the combustion chamber and the movement of air, so that a good combustion effect is achieved. And one part of the fuel oil entering the fuel injector enters a combustion chamber for atomization and combustion to do work, one part of the fuel oil is used for cooling and lubricating a precision matching part inside the fuel injector to prolong the service life of the fuel injector, and the part of the fuel oil is discharged through an oil return hole inside the fuel injector.

The oil return hole external connection part of a common oil injector is designed into a thread structure and is connected with an external oil return pipe through a thread pipe connector or a pipe connector screw. This structure has the following drawbacks: 1. because the oil return pipe of the oil sprayer is frequently and repeatedly disassembled and assembled during the daily maintenance work of the diesel engine, the thread is easy to damage, and the oil sprayer is damaged; 2. the threaded pipe joint and the pipe joint screw both need corresponding metal sealing elements or rubber-metal composite sealing elements for sealing, and the sealing reliability is not high.

Disclosure of Invention

In order to solve the technical problems, the invention provides a high-reliability oil sprayer return oil connection adjusting structure, which reduces the damage probability of an oil sprayer and improves the reliability of oil sprayer return oil connection sealing.

The invention adopts the following technical scheme to complete the invention task:

a high-reliability oil injector oil return connection adjusting structure is characterized in that an oil injector in the connection adjusting structure adopts side oil return, namely a through hole communicated with an oil return hole in the oil injector is formed in the wall surface of one side of the oil injector; the through hole is sequentially provided with a blind cylindrical hole, a taper hole with gradually expanded diameter from inside to outside and a tapered groove communicated with the taper hole from inside to outside; the bottom surface of the conical groove is a plane, and the diameter of the plane is larger than the maximum diameter of the conical hole; the blind cylindrical hole is communicated with an oil return hole in the oil sprayer; the oil sprayer is sleeved with a positioning sleeve; the positioning sleeve is composed of a cylinder I and a cylinder II with different diameters; the cylinder I of the positioning sleeve is provided with a circular through hole which is in clearance fit with the fuel injector; the diameter of the cylinder II is smaller than that of the cylinder I; the center of the cylinder II is provided with a threaded hole communicated with the circular through hole of the cylinder I; the axis of the threaded hole is perpendicular to the axis of the circular through hole; a pressing sleeve is arranged in the threaded hole of the positioning sleeve; the compression sleeve is in clearance fit with the positioning sleeve; a stepped through hole consisting of a cylindrical hole I and a cylindrical hole II is formed in the compression sleeve; the cylindrical hole I is communicated with an oil return hole in the oil sprayer through the blind cylindrical hole; an oil return pipe is welded in the positioning sleeve; the inner diameter of the oil return pipe is the same as that of the cylindrical hole I and that of an oil return hole in the oil sprayer; the rear end of the oil return pipe extends out of the positioning sleeve and is sleeved with a compression nut; one end of the compression nut is positioned between the compression sleeve and the positioning sleeve and is connected with the positioning sleeve into a whole through threads.

The compression sleeve is of a step columnar structure consisting of a cylinder III, a cylinder IV and a cylinder V which are different in diameter; the diameter of the cylinder III is smaller than that of the blind cylindrical hole of the oil sprayer; the diameter of the cylinder V is larger than that of the cylinder III and smaller than that of the cylinder IV; the end face of the cylinder IV combined with the cylinder III is an end face II combined with the bottom surface of the conical groove of the oil sprayer; the end face of the combination of the cylinder IV and the cylinder V is an end face I used for limiting the axial movement of the compression nut; the diameter of the cylinder IV is smaller than the inner diameter of the threaded hole of the positioning sleeve, so that the compression sleeve can be flexibly adjusted in the threaded hole.

The diameter of the outer circle of the oil return pipe is smaller than the inner diameter of the cylindrical hole II, so that the oil return pipe can be conveniently positioned and welded in the cylindrical hole II.

The compression nut is of a step-shaped columnar structure and is provided with a cylinder VI and a regular hexahedron which is convenient for dismounting the compression nut; the cylinder VI is provided with an external thread matched with the threaded hole of the positioning sleeve.

The interior of the compression nut is a stepped hole formed by a cylindrical hole III and a cylindrical hole IV, the diameter of the cylindrical hole III is larger than that of a cylinder V of the compression sleeve, the diameter of the cylindrical hole III is smaller than that of the cylinder IV, on one hand, the compression nut can be freely and flexibly disassembled, and on the other hand, the end face III of the compression nut is tightly attached to the end face I of the compression sleeve.

An O-shaped ring is arranged between the taper hole of the oil sprayer and the pressing sleeve.

The invention provides a high-reliability oil sprayer oil return connection adjusting structure, which adopts the technical scheme and has the following beneficial effects: 1. the oil return connection locking structure of the oil sprayer is designed on the positioning sleeve, the diesel engine is maintained, the damage of the oil sprayer cannot be caused by repeated assembly and disassembly, and the damage probability of the oil sprayer is reduced; 2. the oil return hole of the oil sprayer is externally designed into a taper hole, and an automatic adjusting and positioning process is adopted in the installation process of the O-shaped ring pressing sleeve, so that the oil sprayer is convenient and quick to install; 3. the oil return external interface of the oil sprayer is a conical surface, the design eliminates the sealing of a ball head and a conical surface structure by using a conical hole, and the sealing is carried out by adopting an O-shaped ring, so that the sealing reliability is high on one hand, and the damage of the oil return pipe due to repeated disassembly and assembly is avoided on the other hand. 4. According to the oil return connection structure of the oil injector, the oil return structure of the oil injector is simple and convenient to process; 5. the oil sprayer oil return connecting structure is arranged at the upper part of the oil sprayer and is arranged outside the cylinder head cover, so that problems are easy to find, and the maintenance operation is convenient.

Drawings

FIG. 1 is a schematic view of a partial structure of a fuel injector according to the present invention;

FIG. 2 is a schematic view of a positioning sleeve according to the present invention;

FIG. 3 is a schematic view of the structure of the compression sleeve of the present invention;

FIG. 4 is a schematic view of the compression nut of the present invention;

FIG. 5 is a schematic diagram of the oil return connection structure of the high-reliability oil injector and the working process of the high-reliability oil injector;

in the figure: 1. an oil injector; 2. a positioning sleeve; 3. a compression sleeve; 4. a compression nut; 5. an O-shaped ring;

6. an oil return pipe; 1-1, plane; 1-2, taper holes; 1-3, blind cylindrical holes; 1-4, a tapered groove; 1-5, oil return holes; 2-1, a cylinder I; 2-2, circular through holes; 2-3, cylinder II; 2-4, a threaded hole; 3-1, cylinder III; 3-2, a cylinder IV; 3-3, cylinder V; 3-4, cylindrical hole I; 3-5, cylindrical hole II; 3-6, end face I; 3-7, end face II; 3-8, cylindrical surface; 4-1, a cylinder VI; 4-2, a regular hexahedron; 4-3, cylindrical hole III; 4-4, cylindrical holes IV; 4-5 of end face III.

Detailed Description

The invention is described in connection with the accompanying drawings and the specific embodiments:

the utility model provides a high reliability sprayer oil return connection structure adjusts structure, mainly includes: the oil sprayer comprises an oil sprayer 1, a positioning sleeve 2, a pressing sleeve 3, a pressing nut 4, an O-shaped ring 5 and an oil return pipe 6; the oil injector is shown in figure 1: the side oil return of the oil injector is adopted, the side surface of the oil injector is provided with a plane 1-1, a taper hole 1-2 is arranged perpendicular to the plane 1-1, the tail end of the taper hole 1-2 is provided with a blind cylindrical hole 1-3, and the blind cylindrical hole 1-3 is communicated with an oil return hole 1-5 in the oil injector; the positioning sleeve 2 is as shown in fig. 2, the main structure is a cylinder I2-1, a circular through hole 2-2 is designed inside the cylinder I2-1, the diameter of the circular through hole 2-2 is slightly larger than the diameter of the outer circle of the external oil return joint of the oil injector 1, the circular through hole 2-2 is in clearance fit, the positioning sleeve can be flexibly adjusted and positioned on the oil injector up and down, a cylinder II 2-3 with a small specification size is designed in the middle part perpendicular to the cylinder I2-1, a threaded hole 2-4 is designed inside the cylinder II 2-3, and the threaded hole 2-4 is communicated with the circular through hole 2-; the pressing sleeve 3 is of a step-shaped columnar structure as shown in figure 3, the front end of the pressing sleeve is a cylinder III 3-1, the diameter of the cylinder III 3-1 is smaller than that of a blind cylindrical hole 1-3 in the fuel injector 1, the cylinder III 3-1 can be freely and flexibly adjusted and positioned in the blind cylindrical hole 1-3 in the fuel injector 1 during installation, the middle part of the pressing sleeve is a cylinder IV 3-2, the rear end of the pressing sleeve is a cylinder V3-3, the diameter of the cylinder III 3-1 is the smallest, the cylinder V3-3 is the largest, the diameter of the cylinder IV 3-2 is smaller than that of a cylinder II 2-3 in the positioning sleeve 2, a threaded hole 2-4 is designed in the cylinder II 2-3, the pressing sleeve 3 is ensured to be flexibly adjusted left and right in the threaded hole 2-4 in the positioning sleeve 2, and a step hole, the front end of the oil injector is provided with a cylindrical hole I3-4, the diameter of the cylindrical hole I3-4 is the same as that of an oil return hole in the oil injector 1, smooth oil return of fuel oil is ensured, the rear end of the oil injector is provided with a cylindrical hole II 3-5, the diameter of the cylindrical hole II 3-5 is slightly larger than that of the outer circle of the oil return pipe 6, and the cylindrical hole II 3-5 is in clearance fit, so that the oil return pipe 6 can be conveniently positioned and welded in the cylindrical hole II 3-5 at the; the compression nut 4 is of a step-shaped columnar structure as shown in fig. 4, the front end of the compression nut 4 is a cylinder VI 4-1 with an external thread, the thread specification of the cylinder VI 4-1 is matched with a threaded hole 2-4 designed in a cylinder II 2-3 of the positioning sleeve 2, the rear end of the cylinder VI 4-1 is a regular hexahedron 4-2, so that the compression nut 4 can be conveniently disassembled and assembled, a step hole is formed in the compression nut 4, the front end of the compression nut 4 is a cylindrical hole III 4-3, the diameter of the cylindrical hole III 4-3 is slightly larger than that of a cylinder V3-3 of the compression sleeve 3 and is in clearance fit, the diameter of the cylindrical hole III 4-3 is smaller than that of the cylinder IV 3-2, on one hand, the compression nut 4 can be freely and flexibly disassembled and assembled, on the other hand, the end face III 4-; the O-shaped ring 5 is positioned between the taper hole 1-2 of the oil sprayer 1 and the pressing sleeve 3 after being installed, and plays a role in sealing between the oil sprayer 1 and the pressing sleeve by means of the extrusion deformation of the end surface II 3-7 of the pressing sleeve 3, the cylindrical surface 3-8 and the conical surface of the oil sprayer 1; the oil return pipe 6 is an oil injector oil return passage, the outer diameter of the oil return pipe is slightly smaller than the diameter of a cylindrical hole II 3-5 of the compression sleeve 3 and larger than the diameter of a cylindrical hole I3-4, the oil return pipe 6 is inserted into the compression sleeve 3 and then welded, and the inner diameter of the oil return pipe 6 is the same as the diameter of an oil return hole 1-5 of the oil injector 1 and the diameter of a cylindrical hole I3-4 of the compression sleeve 3, so that smooth fuel oil return is.

The oil return pipe of the invention has the following manufacturing, assembling and working processes: bending an oil return pipe 6 according to actual requirements, sleeving a compression nut 4 on the oil return pipe 6, enabling a cylinder VI 4-1 to face forwards, inserting the oil return pipe into a cylindrical hole II 3-5 of a compression sleeve 3, positioning and welding; sleeving the positioning sleeve 2 on the oil injector, and observing through a threaded hole 2-4 on a cylinder II 2-3 of the positioning sleeve 2 to enable the threaded hole 2-4 to be basically aligned with a taper hole 1-2 of the oil injector 1; sleeving an O-shaped ring 5 on a cylinder III 3-1 at the front end of a pressing sleeve 3, inserting a pressing oil return pipe provided with the O-shaped ring into a threaded hole 2-4 in a cylinder II 2-3 of a positioning sleeve 2, screwing a pressing nut 4, pressing an end face II 3-7 of the positioning sleeve 3 on a plane 1-1 of an oil injector 1 by means of the pretightening force of threads, designing an oil return hole of the oil injector 1 into a tapered hole 1-2 outwards, and having an automatic positioning and adjusting process in the installation process of the pressing sleeve 3 provided with the O-shaped ring 6, so that the installation is convenient and rapid; the O-shaped ring 5 is positioned between the taper hole 1-2 of the oil sprayer 1 and the pressing sleeve 3 after being installed, and plays a role in sealing between the oil sprayer 1 and the pressing sleeve by means of the extrusion deformation of the end surface II 3-7 of the pressing sleeve 3, the cylindrical surface 3-8 and the conical surface of the oil sprayer 1; when the diesel engine works, part of fuel oil entering the fuel injector 1 enters a combustion chamber for atomization for combustion to do work, and part of the fuel oil is used for cooling and lubricating precision matching parts inside the fuel injector 1 and then enters the blind cylindrical holes 1-3 through the oil return holes 1-5 inside the fuel injector 1, and due to the sealing effect of the O-shaped ring 5, return oil enters the oil return pipe 6 through the compression sleeve 3 and is discharged. The oil return connection locking structure of the oil sprayer is designed on the positioning sleeve, the diesel engine is maintained, the damage of the oil sprayer cannot be caused by repeated assembly and disassembly, and the damage probability of the oil sprayer is reduced; the oil return hole of the oil sprayer is externally designed into a taper hole, and an automatic positioning and adjusting process is provided in the installation process of the O-shaped ring pressing sleeve, so that the oil sprayer is convenient and quick to install; the oil return external interface of the oil sprayer is a conical surface, the design eliminates the sealing of a ball head and a conical surface structure by using a conical hole, and the sealing is carried out by adopting an O-shaped ring, so that the sealing reliability is high on one hand, and the damage of the oil return pipe due to repeated disassembly and assembly is avoided on the other hand. The oil sprayer oil return connecting structure is arranged at the upper part of the oil sprayer and is arranged outside the cylinder head cover, so that problems are easy to find, and the maintenance operation is convenient.