Needle valve mating part of diesel

A diesel engine and needle valve technology, applied in engine components, mechanical equipment, machines/engines, etc., can solve the problems of reducing service life, black smoke from diesel, waste of energy and environment, etc., to prevent carbon deposition problems, increase service life, The effect of improving reliability

Inactive Publication Date: 2015-04-29
YUYAO SHUCHUN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the diesel engine is working normally, the needle valve assembly of the fuel injector is always in the state of high temperature, high pressure and high speed, which will easily lead to carbon deposits in the nozzle hole of the needle valve assembly, resulting in oil dripping and poor atomization, and even Diesel fuel can emit black smoke due to incomplete combustion, resulting in insufficient power of the engine, waste of energy, and environmental pollution. In severe cases, the nozzle hole will be completely blocked, resulting in the inability to form an atomization effect, resulting in the product being unusable and scrapped
In the prior art, the needle valve assembly is easy to form carbon deposits at the nozzle hole and block the nozzle hole, resulting in poor atomization effect of the needle valve assembly and shortening the service life

Method used

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  • Needle valve mating part of diesel
  • Needle valve mating part of diesel
  • Needle valve mating part of diesel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Take the high-speed steel according to the composition and mass percentage in Example 1 in Table 1 to make needle valve blanks and valve body blanks. Then perform annealing treatment, the annealing heating rate is 20°C / h, heat it to 800°C for 6 hours, and then cool it to below 500°C at a rate of 20°C / h and leave the furnace. Conventional machining after annealing followed by quenching. When quenching, preheating is carried out first, and preheating is divided into three stages: low temperature preheating, medium temperature preheating and high temperature preheating. The low temperature preheating temperature is 500°C and the time is 60s / mm; the medium temperature preheating temperature is 800°C and the time is 50s / mm; the high temperature preheating temperature is 1000°C and the time is 40s / mm. Finally, the quenching temperature was kept at 1200°C for 50 minutes. After quenching, tempering is carried out twice, the tempering temperature is 550°C, and the holding time...

Embodiment 2

[0047] Take the high-speed steel according to the composition and mass percentage in Example 2 in Table 1 to make needle valve blanks and valve body blanks. Then perform annealing treatment, the annealing heating rate is 25°C / h, when heated to 820°C, keep it for 5h, and then cool to below 500°C at a rate of 22°C / h and leave the furnace. Conventional machining after annealing followed by quenching. When quenching, preheating is carried out first, and preheating is divided into three stages: low temperature preheating, medium temperature preheating and high temperature preheating. The low temperature preheating temperature is 550°C and the time is 58s / mm; the medium temperature preheating temperature is 820°C and the time is 46s / mm; the high temperature preheating temperature is 1050°C and the time is 36s / mm. Finally, the quenching temperature was kept at 1220°C for 45 minutes. After quenching, perform tempering three times, the tempering temperature is 560°C, and the holding ...

Embodiment 3

[0050] Take the high-speed steel according to the composition and mass percentage of Example 3 in Table 1 to make needle valve blanks and valve body blanks. Then perform annealing treatment, the annealing heating rate is 25°C / h, heat it to 830°C for 5h, and then cool it to below 500°C at a rate of 23°C / h. Conventional machining after annealing followed by quenching. When quenching, preheating is carried out first, and preheating is divided into three stages: low temperature preheating, medium temperature preheating and high temperature preheating. The low temperature preheating temperature is 560°C and the time is 55s / mm; the medium temperature preheating temperature is 830°C and the time is 45s / mm; the high temperature preheating temperature is 1080°C and the time is 35s / mm. Finally, the quenching temperature was kept at 1230°C for 40 minutes. After quenching, tempering is carried out 4 times, the tempering temperature is 580°C, and the holding time is 65min.

[0051] Afte...

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Abstract

The invention provides a needle valve mating part of a diesel, and belongs to the technical field of marine diesel injectors; the problem that the atomization effect of the existing needle valve mating part is bad is solved by the needle valve mating part provided by the invention. The needle valve mating part of the diesel comprises a valve body; an axial passage of which one end is communicated with the outside and an oil inlet passage communicated with the axial passage are formed in the valve body; a needle valve is arranged in the axial passage; the other end of the valve body is provided with a sprayer; a plurality of spray orifices communicated with the axial passage are formed in the sprayer; the needle valve moves in the axial passage, and the oil inlet passage and the spray holes can be communicated or isolated. The needle valve mating part of the diesel has the advantages that the atomization effect is good, and the service life is long.

Description

technical field [0001] The invention belongs to the technical field of fuel injectors for marine diesel engines, and relates to a diesel engine needle valve assembly. Background technique [0002] The fuel injector is an important component of the diesel engine. Its main function is to atomize the high-pressure diesel oil from the fuel injection pump according to certain requirements, and distribute it into the combustion chamber to form a good combustible mixture with the air entering the combustion chamber. As the core of the injector assembly, the needle valve coupling is a pair of precision couplings. The guide cylindrical surface on the upper part of the needle valve and the inner cylindrical surface of the needle valve make a high-precision sliding fit, and the requirements for the matching clearance and surface roughness are very high. The needle valve body and the needle valve cone cooperate to act as a seal. Under the action of the spring, it is always in the closed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M61/10C22C38/36C22C38/24C21D9/00
Inventor 舒学军
Owner YUYAO SHUCHUN MACHINERY
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