Oil sprayer valve structure

Abstract

The invention discloses an oil sprayer valve structure. The oil sprayer valve structure comprises a control plunger, a valve sleeve, a pore plate and a fastening valve seat, wherein the pore plate, the valve sleeve and the control plunger define a control cavity. The oil sprayer valve structure further comprises a first pressure buffering floating column and a second pressure buffering floating column which are vertically stacked on the top surface of the control plunger, and the first pressure buffering floating column and the second pressure buffering floating column are both cylindrical; the pore plate is provided with a pore plate oil outlet and a constraint hole matched with the first pressure buffering floating column and the second pressure buffering floating column; the constrainthole and the pore plate oil outlet communicate through a conical hole section and penetrate through the pore plate; the first pressure buffering floating column is completely arranged in the constraint hole; one part of the second pressure buffering floating column is arranged in the constraint hole; the first pressure buffering floating column and the second pressure buffering floating column canmove up and down in the constraint hole; the first pressure buffering floating column is provided with a first oil channel; the second pressure buffering floating column is provided with a second oilchannel; and the first oil channel is communicated with the control cavity through the second oil channel. The oil sprayer valve structure reduces pressure of oil twice, can solve the problem of cavitation damage of a high-pressure sprayer, prolongs the service life of the sprayer and accelerates action response.

Description

technical field [0001] The invention relates to a control valve structure, in particular to a fuel injector valve structure, and belongs to the technical field of high-pressure common rail fuel injection. Background technique [0002] The control valve is an important part of the fuel injector. It can precisely control the opening of the fuel injector and is the key factor affecting the precise control of the fuel injector. Now the injection pressure requirements of the fuel injector are constantly increasing, and the injection pressure is required to be above 200MPa. At the same time, the hydraulic pressure in the cavity of this type of control valve is also continuously increasing. The oil in the control cavity drops from high pressure (200MPa and above) to 0MPa, which will cause cavitation damage. The higher the oil pressure, the more serious the cavitation damage. The easier the oiler is damaged, the shorter the service life. [0003] In the prior art, for example, the ...

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Problems solved by technology

[0002] The control valve is an important part of the fuel injector. It can accurately control the opening of the fuel injector and is the key factor affecting the precise control of the fuel injector. Now the injection pressure requirements of the fuel injector are constantly increasing, and the injection pressure is required to be above 200MPa. At the same time, the hydraulic pressure in the cavity of this type of control valve is also continuously increasing. The oil in the control cavity drops from a high pressure (200MPa and above) to 0MPa, which will cause cavitation damage. The higher the oil pressure, the more serious the cavitation damage. The easier the oiler is damaged, the shorter the service life

[0003] In the prior art, for example, the patent structure of the publication number: CN103967666B does not have a structure for controlling the pressure drop of the cavity slowly, and high pressure will cause cavitation damage, thereby limiting the working pressure of this type of injector; publication number: DE10190272B4 patent technical manual attached Image 6 The restrictor (148) and socket valve (302) shown in the figure can reduce cavitation damage, but there are many sealing contact surfaces between parts, which increases a certain risk of leakage; publication number: CN101595297B patent end The ball seat valve (110) also has an inlet (122) with a pre-throttling device (126) and a diffuser (128) arranged between the pre-throttle device (126) and the valve seat (120). ), the diffuser (128) can play a pressure buffer role for high oil pressure, the pressure in the diffuser (128) decreases, and the pressure difference after the outflow in the diffuser (128) decreases, reducing cavitation damage, The one-piece structure in this patent is as attached to its description figure 2 As shown, it is a thin hole at both ends and a thick hole in the middle, so the difficulty of manufacturing and processing is very high, and the diffuser (128) of the split structure in this patent is as attached to its description. image 3 As shown, the difficulty of processing is reduced, but a sealing contact plane is added, which also increases the risk of leakage

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