A sealing structure in an injector of a fuel supply system
A technology of fuel supply system and sealing structure, which is applied in the direction of fuel injection device, charging system, machine/engine, etc., and can solve the problem that the pressure in the pressure chamber of the valve couple cannot be established normally, the elastic sealing ring blocks the oil inlet hole of the valve body, and the injection In order to achieve the effect of stable sealing, reduce leakage and reduce processing accuracy
Active Publication Date: 2016-05-25
北油电控燃油喷射系统(天津)有限公司
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Problems solved by technology
The initial working stage of the injector will lead to abnormal leakage. In severe cases, the elastic sealing ring will move up and block the oil inlet hole of the valve body, causing the pressure in the pressure chamber of the valve couple to not be established normally, and the injector cannot work normally.
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[0024] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.
[0025] Such as image 3 As shown, the injector body of the present invention is provided with an oil inlet connector 1 outside, and the oil inlet connector 1 communicates with the injector oil inlet hole 2 . The injector valve body 7 is installed in the middle hole of the injector body 10, and the annular oil inlet cavity 3 is formed between the middle hole of the injector body 10 and the outer circle of the valve body 7. The annular oil inlet cavity 3 has two points Function: 1. Connect the oil inlet joint 1 and the injector oil inlet 2, and provide high-pressure fuel to the pressure chamber 5 of the valve couple through the oil inlet 4 of the valve body 7; 2. To ensure that the valve couple does not work Hysteresis ...
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The invention discloses a sealing structure in an ejector of a fuel supply system. The sealing structure is used for radial sealing of an annular cavity formed between an ejector body and a valve body, and allows a little fuel oil to leak from the high-pressure side of a pressure chamber to the low-pressure side of the pressure chamber. The sealing structure comprises a rigid sealing ring and an elastic seal ring, wherein the rigid sealing ring is arranged at the bottom of the annular cavity, and is located on a step on the lower portion of the ejector body, fuel oil passing channels are evenly formed in the inner circumference of the rigid sealing ring in a spaced mode, the elastic seal ring is arranged in the annular cavity, and is supported by the rigid sealing ring, and each fuel oil passing channel in the inner circumference of the rigid sealing ring can be designed to be in an fuel oil circular arc shape. According to the sealing structure in the ejector of the fuel supply system, due to the fact that the fuel oil passing circular arcs are formed in the inner circumference of the rigid sealing supporting ring, and high-pressure fuel oil is allowed to slightly leak to the low-pressure side through the fuel oil passing circular arcs on the inner side of the sealing structure, stable sealing, reduction of the leakage quantity and durable utilization can be effectively ensured, the requirement for machining accuracy is reduced, and the machining cost is reduced.
Description
technical field [0001] The invention relates to a fuel supply system, in particular to a sealing structure in an injector of the fuel supply system. Background technique [0002] The injector of the fuel supply system in the prior art needs to adopt a sealing structure. The purpose of this sealing structure is to improve the sealing performance and prevent the deformation of the seal used in conjunction with it under high temperature and high pressure, that is, to assist in improving the durability and durability of the seal. Service life, and ultimately the durability and service life of the injector assembly. [0003] There are usually two types of traditional sealing structures: [0004] In the first structure, only the elastic sealing ring is provided, and the lower side is not provided with a rigid sealing ring. Although the cost is saved, the elastic sealing ring is prone to deformation, aging and failure when it works in a high-temperature and high-pressure environme...
Claims
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IPC IPC(8): F02M61/16
Inventor 张建明陈晓辉臧微尚伟
Owner 北油电控燃油喷射系统(天津)有限公司