CN110985253A

CN110985253A - Methanol oil sprayer

Info

Publication number: CN110985253A
Application number: CN201911412981.XA
Authority: CN
Inventors: 李成校; 欧阳玲湘; 邓飞; 涂选举; 龙美彪; 黄民备
Original assignee: Nanyuediankong Hengyang Industrial Technology Co ltd
Current assignee: Nanyuediankong Hengyang Industrial Technology Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-04-10

Abstract

The invention discloses a methanol fuel injector which comprises an electromagnet and a fuel injection component arranged in the electromagnet; the oil injection part comprises an oil inlet nozzle part, an iron core, a spring and a nozzle body which are coaxially arranged in the inner hole of the electromagnet, methanol coming from the oil inlet nozzle part passes through the oil inlet inner hole of the iron core, the inner hole of the upper seat of the spring, the axial oil passing inner hole and the radial oil outlet hole of the valve rod, an oil outlet gap is arranged between the middle lower part of the valve rod and the valve rod hole, and the oil injection hole on the valve seat is sprayed out. The methanol fuel injector is not easy to wear in a methanol environment with low viscosity and poor lubricity, and the risk of flow attenuation is greatly reduced. The product has good flow stability, good lubricity, good wear resistance and good reliability.

Description

Methanol oil sprayer

Technical Field

The invention belongs to the technical field of oil injectors, and particularly relates to a methanol oil injector.

Background

At present, methanol is used as a vehicle alternative fuel and is increasingly widely applied at home and in the world, but the methanol fuel injector in the market has poor reliability at present, and after the methanol fuel injector runs for a period of time, the phenomena of engine shaking, fire catching and the like can be caused. The methanol medium has the characteristics of low viscosity and poor lubricity, and a large number of experiments prove that after the methanol medium runs for a period of time, various kinematic pair parts are abraded to different degrees, so that the flow of the oil sprayer is attenuated to different degrees, the maximum flow attenuation reaches about 50%, and the phenomena of engine shaking, fire catching and the like are caused.

Disclosure of Invention

The invention aims to research and develop a methanol oil injector with good flow stability aiming at the problems of the prior similar products.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a methanol fuel injector comprises an electromagnet and a fuel injection component arranged in the electromagnet; the oil injection part comprises an oil inlet nozzle part, an iron core, a spring and a nozzle body which are coaxially arranged in the inner hole of the electromagnet, a valve rod hole is arranged in the nozzle body, a valve seat is arranged at the lower part of the nozzle body, a valve rod is arranged in the valve rod hole in a matched mode, a steel ball is arranged at the lower end of the valve rod, and the outer circle of the steel ball is matched with the oil injection hole in the valve seat so as to open and close the oil injection hole; the oil-leakage valve is characterized in that a spring counter bore and an axial oil passing inner bore are arranged in the valve rod, a plurality of radial oil outlet holes are formed in the lower portion of the valve rod, the spring counter bore is located above and communicated with the axial oil passing inner bore, and the axial oil passing inner bore is communicated with the plurality of radial oil outlet holes; an oil outlet gap is formed between the middle lower part of the valve rod and the valve rod hole; an oil inlet inner hole is formed in the iron core; a spring upper seat is fixed in an oil inlet inner hole of the iron core, and an inner hole is formed in the spring upper seat; the upper end of the spring acts on the bottom of the upper spring seat, and the lower end of the spring acts in a spring counter bore on the valve rod; the methanol coming from the oil inlet nozzle component passes through the oil inlet inner hole of the iron core, the inner hole of the spring upper seat, the spring, the axial oil passing inner hole and the radial oil outlet hole of the valve rod, an oil outlet gap is formed between the middle lower part of the valve rod and the valve rod hole, and the oil spray hole on the valve seat is sprayed out.

In a preferred embodiment of the invention, the spring is made of stainless steel spring steel wires, and the two ends of the spring are respectively coiled by not less than 1.5 circles; the perpendicularity of the end faces at the two ends of the spring to the central line is not more than 0.3mm, and the design is favorable for the spring not to deform in the stretching process; the surface of the spring is subjected to plating treatment, and the plating is not limited to DLC (diamond-like carbon coating), so that the friction coefficient is reduced, and the lubricating property and the wear resistance are good.

In a preferred embodiment of the invention, the iron core is made of ferrite stainless steel soft magnetic material, the oil inlet inner hole of the iron core is divided into two-stage stepped oil inlet inner holes, the two-stage stepped oil inlet inner holes are respectively a first oil inlet inner hole section and a second oil inlet inner hole section from top to bottom, the diameter of the second oil inlet inner hole section is larger than that of the first oil inlet inner hole section by more than 0.2mm, the spring upper seat is fixed in the first oil inlet inner hole section, the upper end of the spring is positioned in the second oil inlet inner hole section, but the outer diameter of the spring is not in contact with the inner diameter of the second oil inlet inner hole section; the surface of the oil inlet inner hole of the iron core and the lower end surface of the iron core are subjected to coating treatment, and the coating is not limited to DLC (diamond-like carbon coating), so that the friction coefficient is favorably reduced, and the lubricating property and the wear resistance are good.

In a preferred embodiment of the present invention, the valve rod is made of a ferrite stainless steel soft magnetic material, the outer circle of the valve rod is composed of two stages of coaxial rod sections, the two stages of coaxial rod sections are a first rod section and a second rod section from top to bottom, the outer diameter of the second rod section is smaller than the outer diameter of the first rod section, the outer circle of the first rod section is in clearance fit with the inner diameter of the valve rod hole in the nozzle body, and the oil outlet gap is arranged between the outer diameter of the second rod section and the valve rod hole; the outer circle surface of the first rod section is subjected to plating treatment, the plating is not limited to DLC (diamond-like carbon coating), the friction coefficient is favorably reduced, and the lubricating property and the wear resistance are good.

In a preferred embodiment of the present invention, the spring counterbore is arranged in the middle of the end of the first rod section, a chamfer is arranged at the inlet of the spring counterbore, and a groove is arranged on the bottom surface of the spring counterbore for positioning the spring.

In a preferred embodiment of the present invention, the radial oil outlet holes are four and are disposed on the second rod segment, and a bottom surface of an axial oil through inner hole in the valve rod is coaxially provided with a conical surface for positioning the steel ball. The design of the axial oil passing inner hole and the four radial oil outlet holes in the valve rod not only forms a methanol circulation channel, but also lightens the quality of the valve rod, and can effectively reduce noise and increase the response speed of a valve rod component.

In a preferred embodiment of the invention, the valve rod hole in the nozzle body is subjected to coating treatment, and the coating is not limited to DLC (Diamond like carbon coating), so that the friction coefficient is reduced, and the lubricating property and the wear resistance are good; the fit clearance between the excircle of the first rod section and the inner diameter of a valve rod hole in the nozzle body is within the range of 0.04-0.08.

In a preferred embodiment of the invention, the surface of the steel ball is subjected to coating treatment, and the coating is not limited to DLC (Diamond like carbon coating), so that the friction coefficient is reduced, and the lubricating property and the wear resistance are good; the steel ball is made of a martensitic stainless steel material, and the hardness of the steel ball is within a range of 58-65 HRC.

In a preferred embodiment of the invention, the steel ball is connected with the valve rod through laser welding, and after the steel ball is welded with the valve rod, the steel ball is symmetrically ground into a pentagonal structure along the center and is used for a methanol circulation channel.

In a preferred embodiment of the invention, the valve seat is made of a martensitic stainless steel material, and the hardness of the valve seat is within a range of 58-65 HRC; the fit clearance between the oil spray hole on the valve seat and the steel ball is within the range of 0.02-0.05, so that the steel ball can not be blocked in the reciprocating motion process in the oil spray hole.

The methanol fuel injector is not easy to wear in a methanol environment with low viscosity and poor lubricity by reducing the friction coefficient of the kinematic pair, and greatly reduces the risk of flow attenuation. The product has good flow stability, good lubricity, good wear resistance and good reliability.

Drawings

FIG. 1 is a schematic diagram of a methanol fuel injector of the present invention.

Fig. 2 is an assembly schematic diagram of the spring, the iron core and the spring upper seat of the invention.

FIG. 3 is a schematic view of the assembly between the valve stem and the nozzle body of the present invention.

Fig. 4 is a schematic view of the assembly between the steel ball and the valve seat of the present invention.

Detailed Description

The invention is further illustrated with reference to the following figures and examples, without thereby restricting the invention to the described examples.

Referring to fig. 1, there is shown a methanol fuel injector including an electromagnet 130 and a fuel injection part installed in the electromagnet 130; the oil injection member includes an oil inlet nozzle member 500 coaxially disposed in the inner bore 210 of the electromagnet 130, an iron core 110, a spring 220, and a nozzle body 320.

A valve rod hole 321 is formed in the nozzle body 320, a valve seat 420 is installed at the lower portion of the nozzle body 320, a valve rod 310 is installed in the valve rod hole 321 in a matching manner, a steel ball 410 is installed at the lower end of the valve rod 310, and the outer circle of the steel ball 410 is matched with an oil injection hole 421 on the valve seat 420 to open and close the oil injection hole 421.

The invention is characterized in that:

a spring counter bore 315 and an axial oil passing inner bore 319 are arranged in the valve rod 310, a plurality of radial oil outlet holes 313 are formed in the lower portion of the valve rod 310, the spring counter bore 315 is located above and communicated with the axial oil passing inner bore 319, and the axial oil passing inner bore 319 is communicated with the plurality of radial oil outlet holes 313; an oil outlet gap a is provided between the middle-lower portion of the stem 310 and the stem hole 321.

An oil inlet inner hole B is formed in the iron core 110; a spring upper seat 120 is fixed in an oil inlet inner hole B of the iron core 110, and an inner hole 121 is formed in the spring upper seat 120; the upper end 221 of the spring 220 acts against the bottom 122 of the upper spring seat 120, and the lower end 222 of the spring 220 acts within a spring counterbore 315 in the valve stem 310; methanol coming from the oil inlet nozzle component 500 is sprayed out through an oil inlet inner hole B of the iron core 110, an inner hole 121 of the spring upper seat 120, the spring 220, an axial oil passing inner hole 319 and a radial oil outlet hole 313 of the valve rod 310, an oil outlet gap A arranged between the middle lower part of the valve rod 310 and the valve rod hole 321, and an oil injection hole 421 on the valve seat 420.

The method comprises the following steps:

referring to fig. 2, the spring 220 is made of stainless steel spring steel wires, the number of the upper end 221 and the number of the lower end 222 are not less than 1.5, the end face of the upper end 221 and the end face of the lower end 222 of the spring 220 is not more than 0.3mm perpendicular to the center line, and the design is favorable for the spring 220 not to deform easily in the expansion process; the surface of the spring 220 is coated, and the coating is not limited to DLC (diamond-like carbon coating), so that the friction coefficient is favorably reduced, and the lubricating property and the wear resistance are good;

referring to fig. 1 and 2, the oil inlet hole B of the iron core 110 is a two-step oil inlet hole, and the two-step oil inlet hole is a first oil inlet hole section 111 and a second oil inlet hole section 112 from top to bottom. The second oil feed bore hole section 112 is larger than the first oil feed bore hole section 111 by more than 0.2mm in diameter, in order to avoid the second bore section 112 from contacting the spring 220. The spring upper seat 120 is fixed within the first oil feed inner bore section 111 and the upper end 221 of the spring 220 is located in the second oil feed inner bore section 112, but the outer diameter of the spring 220 does not contact the inner diameter of the second oil feed inner bore section 112.

The surfaces of the second oil inlet inner hole section hole 112 and the lower end surface 113 of the iron core 110 are coated, and the coating is not limited to DLC (diamond-like carbon coating), so that the friction coefficient is favorably reduced, and the lubricating property and the wear resistance are good;

referring to fig. 1 and 3, the valve rod 310 is made of ferrite stainless steel soft magnetic material, the outer circle of the valve rod 310 is composed of two stages of coaxial rod sections, the two stages of coaxial rod sections are a first rod section 311 and a second rod section 312 from top to bottom, the outer diameter of the second rod section 312 is smaller than the outer diameter 311 of the first rod section, the outer circle of the first rod section 311 is in clearance fit with the inner diameter of a valve rod hole 321 in the nozzle body 320, and the fit clearance is within the range of 0.04-0.08. An oil outlet gap a is provided between the outer diameter of the second rod segment 312 and the valve rod bore 321.

The outer circle surface of the first rod section 311 is subjected to plating treatment, and the plating is not limited to DLC (diamond-like carbon coating), so that the friction coefficient is reduced, and the lubricating property and the wear resistance are good.

A spring counterbore 315 is provided in the middle of the upper end of the first rod section 311, a chamfer 316 is provided at the entrance of the spring counterbore 315, and a recess 314 is provided in the bottom surface of the spring counterbore 315 for locating the lower end 222 of the spring 220.

The radial oil outlet holes 313 are four and are arranged on the second rod section 312, and the bottom surface of the axial oil passing inner hole 319 in the valve rod 310 is coaxially provided with a conical surface 318 for positioning the steel ball 410. The design of the axial oil passing inner hole 319 and the four radial oil outlet holes 313 in the valve rod 310 not only forms a methanol circulation channel, but also lightens the mass of the valve rod 310, and can effectively reduce noise and increase the response speed of valve rod parts.

Referring to fig. 1 and 3, the valve stem hole 321 in the nozzle body 320 is coated, and the coating is not limited to DLC (diamond like carbon coating), which is advantageous in reducing the friction coefficient and has good lubricity and wear resistance.

The steel ball 410 is coated with a coating layer which is not limited to DLC (Diamond like carbon coating), which is beneficial to reducing the friction coefficient and has good lubricity and wear resistance. The steel ball 410 is made of a martensitic stainless steel material, and the hardness of the steel ball 410 is within a range of 58-65 HRC.

The steel ball 410 is connected with the conical surface 318 on the bottom surface of the axial oil through inner hole 319 in the valve rod 310 through laser welding, and after the steel ball 410 is welded with the valve rod 310, the steel ball 410 is symmetrically ground into a pentagonal structure 411 along the center and used for a methanol circulation channel.

Referring to fig. 4, the valve seat 420 is made of a martensitic stainless steel material, and the hardness of the valve seat 420 is within a range of 58-65 HRC. The fit clearance between the oil spray hole 421 on the valve seat 420 and the steel ball 410 is in the range of 0.02-0.05, so that the steel ball 410 can not be stuck in the reciprocating motion process in the oil spray hole 421.

The working principle of the methanol oil sprayer is as follows:

referring to fig. 1, the electronic control unit driving module energizes the electromagnet 130 at a proper time, the electromagnet 130 generates electromagnetic force to drive the valve rod 310 to move upward, the valve rod 310 drives the steel ball 410 to leave the conical surface of the oil injection hole 421 in the valve seat 420, methanol is injected from the oil injection hole 421 in the valve seat 420, at this time, the spring 220 is compressed, when the electronic control unit driving module stops energizing the electromagnet 130, the spring 220 is released, under the action of the spring 220, the valve rod 310 and the steel ball 410 are pushed to be attached to the conical surface of the oil injection hole 421 in the valve seat 420, the injector is closed, and oil injection is finished.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A methanol fuel injector comprises an electromagnet and a fuel injection component arranged in the electromagnet; the oil injection part comprises an oil inlet nozzle part, an iron core, a spring and a nozzle body which are coaxially arranged in the inner hole of the electromagnet, a valve rod hole is arranged in the nozzle body, a valve seat is arranged at the lower part of the nozzle body, a valve rod is arranged in the valve rod hole in a matched mode, a steel ball is arranged at the lower end of the valve rod, and the outer circle of the steel ball is matched with the oil injection hole in the valve seat so as to open and close the oil injection hole; the oil-leakage valve is characterized in that a spring counter bore and an axial oil passing inner bore are arranged in the valve rod, a plurality of radial oil outlet holes are formed in the lower portion of the valve rod, the spring counter bore is located above and communicated with the axial oil passing inner bore, and the axial oil passing inner bore is communicated with the plurality of radial oil outlet holes; an oil outlet gap is formed between the middle lower part of the valve rod and the valve rod hole; an oil inlet inner hole is formed in the iron core; a spring upper seat is fixed in an oil inlet inner hole of the iron core, and an inner hole is formed in the spring upper seat; the upper end of the spring acts on the bottom of the upper spring seat, and the lower end of the spring acts in a spring counter bore on the valve rod; the methanol coming from the oil inlet nozzle component passes through the oil inlet inner hole of the iron core, the inner hole of the spring upper seat, the spring, the axial oil passing inner hole and the radial oil outlet hole of the valve rod, an oil outlet gap is formed between the middle lower part of the valve rod and the valve rod hole, and the oil spray hole on the valve seat is sprayed out.

2. The methanol fuel injector of claim 1, characterized in that the spring is made of stainless steel spring wire, and the two ends of the spring are not less than 1.5 circles; the perpendicularity of the end surfaces at two ends of the spring to the central line is not more than 0.3 mm; the surface of the spring is plated.

3. The methanol fuel injector of claim 1, characterized in that the iron core is made of ferrite stainless steel soft magnetic material, the fuel inlet inner hole of the iron core is divided into two-stage stepped fuel inlet inner holes, the two-stage stepped fuel inlet inner holes are respectively a first fuel inlet inner hole section and a second fuel inlet inner hole section from top to bottom, the diameter of the second fuel inlet inner hole section is larger than that of the first fuel inlet inner hole section by more than 0.2mm, the spring upper seat is fixed in the first fuel inlet inner hole section, the upper end of the spring is positioned in the second fuel inlet inner hole section but the outer diameter of the spring is not in contact with the inner diameter of the second fuel inlet inner hole section; the surface of the oil inlet inner hole of the iron core and the lower end surface of the iron core are subjected to coating treatment.

4. The methanol fuel injector according to claim 1, characterized in that the valve rod is made of ferrite stainless steel soft magnetic material, the outer circle of the valve rod is composed of two stages of coaxial rod sections, the two stages of coaxial rod sections are respectively a first rod section and a second rod section from top to bottom, the outer diameter of the second rod section is smaller than the outer diameter of the first rod section, the outer circle of the first rod section is in clearance fit with the inner diameter of a valve rod hole in the nozzle body, and the oil outlet gap is arranged between the outer diameter of the second rod section and the valve rod hole; and carrying out plating treatment on the outer circle surface of the first rod section.

5. The methanol fuel injector of claim 4, characterized in that the spring counterbore is arranged at the middle position of the end of the first rod section, a chamfer is arranged at the inlet of the spring counterbore, and a groove is arranged on the bottom surface of the spring counterbore for positioning the spring.

6. The methanol fuel injector of claim 4, characterized in that the radial fuel outlet holes are four and are arranged on the second rod section, and the bottom surface of the axial fuel passing inner hole in the valve rod is coaxially provided with a conical surface for positioning the steel ball.

7. The methanol fuel injector of claim 1, characterized in that the valve stem bore in the nozzle body is coated; the fit clearance between the excircle of the first rod section and the inner diameter of a valve rod hole in the nozzle body is within the range of 0.04-0.08.

8. The methanol fuel injector of claim 1, characterized in that the steel ball surface is coated; the steel ball is made of a martensitic stainless steel material, and the hardness of the steel ball is within a range of 58-65 HRC.

9. The methanol fuel injector of claim 1, characterized in that the steel ball is connected with the valve rod by laser welding, and after the steel ball is welded with the valve rod, the steel ball is symmetrically ground into a pentagon structure along the center for a methanol flow channel.

10. The methanol fuel injector as claimed in claim 1, characterized in that the valve seat is made of martensitic stainless steel material, and the hardness of the valve seat is within a range of 58-65 HRC; the fit clearance between the oil spray hole on the valve seat and the steel ball is within the range of 0.02-0.05, so that the steel ball can not be blocked in the reciprocating motion process in the oil spray hole.