CN-117307377-B - Fuel injector

CN117307377BCN 117307377 BCN117307377 BCN 117307377BCN-117307377-B

Abstract

The invention discloses an oil sprayer which comprises an electromagnet, a moving assembly and a limiting assembly, wherein the moving assembly comprises a valve rod, an attracted component and a valve core, the limiting assembly comprises a first limiting part, a second limiting part, a first elastic part and a magnetic component arranged between the first limiting part and the second limiting part, the moving assembly can move among a first position, a second position and a third position, when the moving assembly is positioned at the first position, the electromagnet is powered off, the attracted component is separated from the magnetic component, the valve core is abutted to a valve seat, when the moving assembly is positioned at the second position, the electromagnet is the same as the magnetic component in magnetism, the magnetic component is abutted to the second limiting part, the attracted component is abutted to the magnetic component, the valve core is provided with a first gap with the valve seat, when the moving assembly is positioned at the third position, the electromagnet is different from the magnetic component in magnetism, the magnetic component is abutted to the first limiting part, the attracted component is abutted to the magnetic component, and the valve core is provided with a second gap with the second gap, and the second gap is larger than the first gap. This allows the magnitude of the injection quantity of the injector to be adjusted.

Inventors

LI XIANGCHAO
FAN BENZHENG

Assignees

上海汽车集团股份有限公司

Dates

Publication Date: 20260505
Application Date: 20220620

Claims (10)

1. The fuel injector comprises a shell and a valve seat, wherein a fuel channel is arranged in the shell, one end of the shell is provided with an oil inlet communicated with the fuel channel, the other end of the shell is connected with one end of the valve seat and is relatively fixed, a cavity is arranged in the valve seat, one end of the cavity is connected with one end of the fuel channel far away from the oil inlet and is communicated with the end of the fuel channel, and the other end of the valve seat is provided with an oil outlet nozzle communicated with the cavity, The electromagnet is arranged in the shell and is positioned outside the fuel channel, and the limiting component and the moving component are arranged in the fuel channel; The moving assembly comprises a valve rod, an attracted component arranged at the first end part of the valve rod and a valve core arranged at the second end part of the valve rod, and can move between a first position, a second position and a third position relative to the fuel channel; The limiting assembly comprises a first limiting part, a second limiting part, a first elastic part and a magnetic part; the first limiting part and the second limiting part are fixed on the fuel channel and are arranged at intervals from the oil inlet to the direction of the oil outlet nozzle; the first elastic part is arranged on one side of the sucked component close to the oil inlet and penetrates through the magnetic part, and two ends of the first elastic part are respectively abutted against the sucked component and the inner wall of the fuel channel; wherein the electromagnet is arranged at one side of the first limit part far away from the second limit part, the attracted component is a component which can be attracted by the magnetic component and the electromagnet magnetized by electrifying, and When the moving assembly is positioned at the first position, the electromagnet is powered off, the attracted component is separated from the magnetic component under the elastic acting force of the first elastic part, and the valve core is abutted with the valve seat; When the moving assembly is positioned at the second position, the electromagnet is electrified with reverse current, the magnetism of the electromagnet is the same as that of the magnetic component, the magnetic component is abutted against the second limiting part, the attracted component is abutted against the magnetic component, and a first gap is formed between the valve core and the valve seat; When the moving assembly is positioned at the third position, the electromagnet is electrified with forward current, the magnetism of the electromagnet is different from that of the magnetic component, the magnetic component is abutted against the first limiting part, the attracted component is abutted against the magnetic component, a second gap is formed between the valve core and the valve seat, and the second gap is larger than the first gap.
2. The fuel injector of claim 1, wherein the limit assembly further comprises a second elastic portion, the second elastic portion is disposed on a side of the magnetic component, which is close to the oil inlet, and is located on an outer periphery of the first elastic portion and penetrates through the first limit portion, two ends of the second elastic portion are respectively abutted to the magnetic component and an inner wall of the fuel channel, and when the moving assembly is in the first position, the magnetic component is abutted to the second limit portion under elastic force of the second elastic portion.
3. The fuel injector of claim 2 wherein said magnetic component is a circlip made of a permanent magnetic material.
4. The fuel injector of claim 3, wherein the first stop portion is a first stop collar and the second stop portion is a second stop collar, and wherein the first stop collar and the second stop collar have inner diameters greater than the inner diameter of the movable retainer.
5. The fuel injector of claim 4, wherein said actuated member comprises an armature, said actuated member has a circular cross-section, and said actuated member has a diameter less than an inner diameter of said second stop collar to enable said actuated member to pass through said second stop collar, and said actuated member has a diameter greater than an inner diameter of said movable retainer.
6. The fuel injector of claim 5 wherein said first resilient portion is a first spring and said second resilient portion is a second spring.
7. The fuel injector of claim 6, wherein said electromagnet comprises a plug and a solenoid, wherein said plug is electrically connected to said solenoid, and wherein said solenoid is disposed about an outer periphery of said fuel passage.
8. The fuel injector of claim 7 wherein said spool is spherical and said cavity of said valve seat is a spherical cavity adapted to said spool.
9. The fuel injector of any one of claims 1-8, wherein an O-ring is provided on an outer periphery of said one end of said housing.
10. A fuel injector as claimed in any one of claims 1 to 8 wherein a sealing ring is provided around the periphery of the end of the housing adjacent the valve seat.

Description

Fuel injector Technical Field The invention belongs to the technical field of vehicle fuel injection, and particularly relates to an oil sprayer. Background The engine is a main power device of the vehicle, fuel injected into the cylinder by the fuel injector and air sucked into the cylinder by the air inlet system are mixed to generate a severe combustion reaction, the generated high-temperature high-pressure gas pushes the piston to move up and down, and finally, the fuel is converted into rotary mechanical energy by the crank-connecting rod mechanism to be output. The fuel injection characteristics of the fuel injector have a critical effect on the quality of the mixture formation, which in turn directly affects whether the gasoline combustion is sufficient or not, and consequently the fuel consumption and emission level of the engine. In recent years, various new technologies for engine combustion have been developed to achieve energy saving and emission reduction, including stratified lean combustion. The stratified lean combustion adopts excessive air to ensure the fuel to be fully combusted, so the fuel has great fuel saving potential. To ensure reliable ignition of the lean mixture, it is necessary to inject a small amount of fuel at the end of the compression stroke so that there is a proper concentration of the mixture near the spark plug. However, the fuel injected late in the compression stroke causes insufficient combustion due to short atomization time, so that the smaller the fuel injection amount is, the better the smooth ignition is ensured. Meanwhile, the fuel injector also needs to meet the fuel injection quantity requirement of the maximum power of the engine, so that the fuel injector flow must ensure certain flow. Under the current technical conditions, the requirements of layered lean-burn high-power large fuel injection quantity and compression top dead center extremely small fuel injection quantity are hardly met by adopting one fuel injector, and cost rise and arrangement difficulty can be caused by adopting more than two fuel injectors. Disclosure of Invention The invention aims to solve the problems that in the prior art, the requirements of layered lean-burn high-power large oil injection quantity and compression top dead center extremely small oil injection quantity are difficult to meet by adopting one oil injector, and the cost is increased and the arrangement is difficult due to adopting more than two oil injectors. In order to solve the technical problems, the embodiment of the invention discloses an oil sprayer which comprises a shell and a valve seat, wherein a fuel channel is arranged in the shell, one end of the shell is provided with an oil inlet communicated with the fuel channel, the other end of the shell is connected with one end of the valve seat and is relatively fixed, a cavity is arranged in the valve seat, one end of the cavity is connected and communicated with one end of the fuel channel, which is far away from the oil inlet, the other end of the valve seat is provided with an oil outlet nozzle communicated with the cavity, the oil sprayer also comprises an electromagnet, a moving assembly and a limiting assembly, The electromagnet is arranged in the shell and is positioned outside the fuel channel, and the limiting component and the moving component are arranged in the fuel channel. The moving assembly comprises a valve rod, an attracted component arranged at the first end part of the valve rod and a valve core arranged at the second end part of the valve rod, and can move between a first position, a second position and a third position relative to the fuel channel. The limiting assembly comprises a first limiting part, a second limiting part, a first elastic part and a magnetic part, wherein the first limiting part and the second limiting part are fixed on the fuel oil channel and are arranged at intervals in the direction from the oil inlet to the oil outlet nozzle, the magnetic part is arranged between the first limiting part and the second limiting part and is in sliding connection with the fuel oil channel, the first elastic part is arranged on one side of the sucked part close to the oil inlet and penetrates through the magnetic part, and two ends of the first elastic part are respectively abutted against the sucked part and the inner wall of the fuel oil channel. Wherein, the The electromagnet is arranged at one side of the first limit part far away from the second limit part, the attracted component is a component which can be attracted by the magnetic component and the electromagnet magnetized by electrifying, and When the moving assembly is at the first position, the electromagnet is powered off, the attracted component is separated from the magnetic component under the elastic force of the first elastic part, and the valve core is abutted with the valve seat. When the moving assembly is at the second position, the electromagnet is electrified wit