Double-oil cylinder needle valve coupling part of low speed machine
A low-speed machine and oil chamber technology, applied to engine components, mechanical equipment, machines/engines, etc., can solve problems such as being vulnerable to damage, increase spring preload, prevent secondary injection and intermittent injection Effect
Inactive Publication Date: 2018-10-09
HARBIN ENG UNIV
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Problems solved by technology
The nozzles all protrude into the combustion chamber and are in direct contact with the high-temperature gas, so they are easily damaged after a long time
Method used
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[0015] The present invention is described in more detail below in conjunction with accompanying drawing example:
[0016] combine Figure 1-3 , the present invention discloses a needle valve coupler with double oil chambers. The needle valve coupler with double oil chambers includes a needle valve body 2 and a needle valve 1 installed in the needle valve assembly hole. The needle valve 1 consists of three sections with different diameters. The diameter of the needle valve assembly hole is composed of three sections, and the diameter of the three-section hole gradually decreases from top to bottom. There is a cone-shaped oil hole in the middle of the first section hole and the second section hole. Cavity 3, the second section hole and the third section hole also have the same frustum-shaped oil chamber 4; from the upper part of the needle valve body 2, there is an inclined oil passage 5 leading directly to the first oil chamber 3, and from the first oil chamber 3 There is a ve...
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The invention aims at providing a double-oil cylinder needle valve coupling part of a low speed machine. The double-oil cylinder needle valve coupling part comprises a needle valve and a needle valvebody, wherein the needle valve body comprises three hole sections having different pore diameters; a first circular truncated cone-shaped oil cavity is formed in a connecting part between a second hole section and a first hole section; a second circular truncated cone-shaped oil cavity is formed in a connecting part between a third hole section and a second hole section; a needle valve seat bulgeis arranged on the third hole section; the needle valve comprises a first cylinder, a second cylinder and a third cylinder which have different diameters; the end of the third cylinder is matched withthe needle valve seat bulge; a spray nozzle is arranged below the needle valve body; a pressure chamber is arranged in the spray nozzle; an oil hole is formed in the spray nozzle; an inclined oil channel is formed in the first hole section of the needle valve body; a vertical oil channel is formed in the second hole section; the inclined oil channel communicates with a first oil cavity; and the vertical oil channel communicates with the first oil cavity and a second oil cavity. The double-oil cylinder needle valve coupling part can prevent secondary oil spraying and interrupted oil spraying;the vertical oil hole and inclined oil hole of the spray nozzle can optimize the fuel atomization and widen the spraying range; and silicon carbide materials sprayed by the spray nozzle resist fire and high temperature.
Description
technical field [0001] The invention relates to a fuel injector for a diesel engine, in particular to a needle valve assembly. Background technique [0002] As the key parts of the diesel engine and the precision parts in the injector, the needle valve assembly can be directly reflected in the working state of the whole machine, such as the knocking sound of the diesel engine, the increase of the fuel consumption rate, the Phenomena such as rising surface and abnormal smoke exhaust are closely related to the failure of the needle valve assembly. [0003] During the working process of the traditional needle valve assembly, after the needle valve is seated, if the pressure in the oil chamber rises again due to the reflection and superposition of the pressure wave, when the oil pressure exceeds the opening pressure of the needle valve, the needle valve will open again, and the fuel oil will After the injection, it will be sprayed into the combustion chamber again. At this time...
Claims
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IPC IPC(8): F02M61/10F02M61/16
CPCF02M61/10F02M61/166
Inventor 王贵新苏衍畔李晓波陈广库吴文涛杨瑞
Owner HARBIN ENG UNIV