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Negative-pressure structure easy for oil return of oil injector

A fuel injector and negative pressure technology, which is applied in the direction of machine/engine, fuel injection device, engine components, etc., can solve the problems of high oil return pressure, instability, and the influence of normal operation of the injector, so as to improve the oil return efficiency. Effect

Inactive Publication Date: 2012-07-18
CHONGQING FUEL INJECTION SYST CO LTD OF CHINA NAT HEAVY DUTY TRUCK GRP
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The fuel injector is a key part of the engine, and the working state of the fuel injector directly affects the working state of the engine; the existing fuel injector assembly is provided with an oil return passage for the fuel injector to return oil. Only when the returned oil is discharged through the oil return channel in time can the fuel injector reach the best working condition; the oil return structure of the prior art completely relies on the residual pressure and gravity in the injector to discharge, and the oil that needs to be discharged It mainly comes from the internal leakage of the fuel injector and the oil return during the fuel injection operation, which is extremely unstable, and the impact of the interception of the diameter of the oil return pipe
Therefore, it is easy to generate high oil return pressure in the oil return pipe of the injector, which has a great influence on the normal operation of the injector.

Method used

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Embodiment Construction

[0014] In the existing oil supply system, in addition to the oil return structure for the injector, the oil return structure is also set for the oil pump. The oil return pressure of the oil pump mainly comes from the pushing action of the oil pump, so the oil return pressure of the oil pump The oil pressure is relatively large, and the oil pressure is relatively stable, and the oil returned by the oil pump and the injector finally returns to the oil tank. Therefore, the inventor considers using the pressure of the oil returned by the oil pump to generate the Venturi effect, and then uses the Venturi effect to extract the oil from the injector. Oil return, so as to ensure smooth oil return of the injector, the specific plan is:

[0015] A negative pressure structure that is convenient for injector oil return, which is composed of a negative pressure structure 1 and a nozzle 2; the negative pressure structure 1 is provided with a nozzle installation groove, an injector return oil...

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Abstract

The invention discloses a negative-pressure structure easy for oil return of an oil injector, which is characterized in that the structure is composed of a negative-pressure structure body and a nozzle, the structure formed of the negative-pressure structure body and the nozzle enables a Venturi structure to be formed between the nozzle and the oil inlet channel of the oil tank; the retun oil of the oil injector can be extracted by means of the negative pressure brought about by the Venturi structure. The negative-pressure structure of the invention has the following beneficial effects: the efficiency for discharging residual oil in an oil injector assembly is effectively improved, and the oil injector assembly is ensured to be in a good working state, so as to improve the working condition of an engine.

Description

technical field [0001] The invention relates to a fuel oil return structure, in particular to a negative pressure structure for facilitating the oil return of a fuel injector. Background technique [0002] The fuel injector is a key part of the engine, and the working state of the fuel injector directly affects the working state of the engine; the existing fuel injector assembly is provided with an oil return passage for the fuel injector to return oil. Only when the returned oil is discharged through the oil return channel in time can the fuel injector reach the best working condition; the oil return structure of the prior art completely relies on the residual pressure and gravity in the injector to discharge, and the oil that needs to be discharged It mainly comes from the internal leakage of the fuel injector and the oil return during the fuel injection operation, which is extremely unstable, and the impact of the interception of the diameter of the oil return pip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M61/18F02M61/16
Inventor 秦国权屈满财
Owner CHONGQING FUEL INJECTION SYST CO LTD OF CHINA NAT HEAVY DUTY TRUCK GRP
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