Low oil-return type electromagnetic control oil sprayer

Abstract

The invention aims at providing a low oil-return type electromagnetic control oil sprayer, which comprises an electromagnetic valve part, a control piston, a return spring, an oil nozzle part which are installed in an oil sprayer body and connected in sequence. The control piston is installed in a control cavity body, and the electromagnetic valve part comprises a coil, an electromagnet, an armature, a control valve core return spring, a stop ring and a control valve core which are all installed in the electromagnetic valve body. The coil and the control valve core return spring are installed in the electromagnet connected with the armature, the control valve core is clamped on the armature through the stop ring, one end of the control valve core is connected with the control valve core return spring, and the other end of the control valve core is connected with the control cavity body. The low oil-return type electromagnetic control oil sprayer can close an oil inlet way of a control cavity during oil spraying process of the oil sprayer and prevent high pressure fuel oil from entering the control cavity so as to reduce oil return amount, save oil pump compression work of the fuel oil, reduce temperature rising of an oil tank, simultaneously improve oil spraying effect and economical performance and motive power performance of an engine.

Description

technical field [0001] The invention relates to a fuel injector of an engine fuel injection system. Background technique [0002] In recent years, the technology of electronically controlled fuel injectors for diesel engines has developed rapidly, and the application of electronically controlled fuel injectors has become an inevitable trend in the development of diesel engines. Due to the fast response characteristics of the high-speed solenoid valve, it can quickly and accurately control the fuel injection quantity and injection law of the diesel engine, so as to achieve the purpose of improving the economy, power and reducing harmful emissions of the diesel engine. [0003] The currently applied solenoid valve-controlled fuel injector divides the high-pressure fuel from the high-pressure oil pipe into two paths: one path enters the fuel tank below the needle valve of the injector, and the other path enters the control chamber above the control piston. When the solenoid va...

AI Technical Summary

Problems solved by technology

However, there are still deficiencies in the existing electronically controlled fuel injectors, which need to be further optimized and improved: 1. When the fuel injector injects fuel, the oil inlet hole and the oil drain hole in the control chamber are connected, and the high-pressure oil is directly discharged after entering the control chamber into the low-pressure fuel tank, wasting the compression work of this part of the fuel; 2: The fuel will heat up during the process of being compressed, and the temperature of the fuel in the fuel tank will rise after flowing back to the low-pressure fuel tank; 3: During the opening process of the injector, The oil inlet hole is also entering oil while the oil drain hole in the control chamber is draining, which reduces the pressure relief rate of the control chamber and the needle valve rising speed; during the closing process of the injector, due to the small diameter of the oil inlet hole, the The pressure build-up rate is slow, which reduces the needle valve seating rate

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