Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Device for strengthening inner wall surfaces of center holes of oil injectors and method for applying device

A technology for strengthening devices and injectors, which is applied to fuel injection devices, charging systems, machines/engines, etc. It can solve problems such as parts deformation and high-pressure sealing local structure strengthening, and achieve good process stability and jet parameters. Insensitivity, effect of mitigating crack growth

Inactive Publication Date: 2018-09-14
CHINA FIRST AUTOMOBILE
View PDF8 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ultra-high pressure liquid strengthening will cause large deformation of parts, and high-pressure sealing problems and strengthening of local structures are difficult to achieve

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Device for strengthening inner wall surfaces of center holes of oil injectors and method for applying device
  • Device for strengthening inner wall surfaces of center holes of oil injectors and method for applying device
  • Device for strengthening inner wall surfaces of center holes of oil injectors and method for applying device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0031] A method for using a device for strengthening the inner wall of a middle hole of a fuel injector uses an elongated cavitation nozzle whose diameter is smaller than that of the middle hole of a common rail fuel injector to extend into the hole to be processed. The high-pressure fluid medium is connected to the inlet of the cavitation nozzle, and the high-pressure fluid in the cavitation nozzle is sprayed out through the nozzle hole 5, and a large number of cavitation will be generated when the high-pressure jet flow out passes through the nozzle hole 5; When the jet reaches the surface to be processed, the cavitation in the jet collapses on the surface of the workpiece to strengthen it. The reason for the cavitation of the cavitation nozzle here is that when the liquid flows out through the cavitation nozzle, due to the high-speed flow and volume expansion of the liquid, the local pressure in the liquid beam will decrease. When the local pressure P in the jet decreases to...

example 1

[0037] Such as figure 1 is a schematic diagram of the cavitation nozzle. The cavitation nozzle 3 is a hollow structure, and one end of the cavitation nozzle 3 has a spray hole 5 . The cavitation nozzle 3 is fed with a high-pressure fluid 4 from one end, and the pressure of the high-pressure fluid 4 is set within the range of 1MPa-100MPa according to the process requirements. The fluid pressure in this example is 50MPa. The outer diameter of the cavitation nozzle is 3.8 mm, and the inner diameter of the cavitation nozzle is 1.2 mm. The high-pressure fluid 4 sprays out a jet 6 through the nozzle hole 5, and the diameter of the nozzle hole 5 is selected as 0.3 mm in this example.

[0038] After the high-pressure fluid passes through the nozzle hole 5, a large number of cavitation bubbles will be generated in the jet 6. After the jet 6 sandwiching the air bubbles touches the solid wall, the air bubbles will collapse and produce local high energy to strengthen the surface of th...

example 2

[0042] The cavitation nozzle in Example 1 is used for the cavitation processing of the inner hole of the common rail injector.

[0043] Such as figure 2 Shown is a schematic diagram of cavitation processing in the body of a common rail injector. The injector body 2 is a hollow structure with a through hole, the diameter of the inner hole wall to be processed (injector body reinforced wall 21 ) is 4.1 mm, and the axial length of the injector body reinforced wall 21 is 33 mm. Using the cavitation nozzle 3 in Example 1, the jet 6 directly acts on the reinforced wall surface 21 of the injector body.

[0044] The cavitation nozzle 3 and the reinforced wall surface 21 of the injector body can move relative to each other in the axial direction, so as to satisfy the processing range with an axial length of 33 mm. The cavitation nozzle 3 and the reinforced wall surface 21 of the fuel injector body can be rotated relative to each other, so as to meet the requirement of uniform reinfo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the field of surface strengthening, relates to hole wall inner surface strengthening, and particularly relates to a device for strengthening inner wall surfaces of center holes of oil injectors and a method for applying the device. The device comprises a cavitation nozzle. An inlet which is connected with high-pressure fluid is formed in one end of the cavitation nozzle, and two and more orifices are formed in the other end of the cavitation nozzle; the outer diameter of the cavitation nozzle is not larger than the inner diameters of the center holes of the oil injectors. The device and the method have the advantage that the device is suitable for strengthening treatment on the inner wall surfaces on high-precision finished components and semi-finished components and the inner wall surfaces of thin-walled components.

Description

technical field [0001] The invention belongs to the field of surface strengthening, and relates to the inner surface strengthening of hole walls, in particular to a device for strengthening the inner wall surface of the middle hole of a fuel injector and a use method thereof. Background technique [0002] The energy-saving and environmental protection performance of automobiles has attracted more and more attention, and high-pressure common rail technology has significant technical advantages in diesel engines. The fuel injector in the diesel engine common rail system is the key to the whole common rail system. The fuel injector body and the needle valve body in the fuel injector have two micro-movement mating surfaces in the inner holes, and the mating surfaces serve as ultra-high pressure sealing and motion guidance effect. The mating surface has to undergo surface strengthening and coating treatment in the production process, and has a high surface precision. Since the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): F02M61/16F02M61/18
CPCF02M61/166F02M61/18
Inventor 张武凯居钰生杨海涛陈后涛吴东兴顾丽李波彭炜王清华
Owner CHINA FIRST AUTOMOBILE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com