The umbrella spray oil nozzle of band needle-valve head protection cover
Technical field
The present invention relates to a kind of umbrella spray oil nozzle with needle-valve head protection cover, it belongs to the fueling injection equipment of fuel of internal combustion engine system.
Background technique
At present, the spraying of umbrella spray oil nozzle has the advantages that atomization is good, circumferencial direction is evenly distributed, injection rate is fast, has the potentiality that popularize.But because of the elongated structural feature of its needle-valve head, and be exposed to needle-valve body outside, so just cause it in transportation and using process, very easily to cause the needle-valve head accident that fractures.Because the existence of this unsafe factor has also limited the extensive use of umbrella spray oil nozzle.Therefore, need a kind of comparatively safe structure that can umbrella spray injector valve head.
Summary of the invention
Bump disconnected problem easily in order to solve umbrella spray oil nozzle head, the invention provides a kind of umbrella spray oil nozzle, under the prerequisite of this umbrella spray oil nozzle air motion in not influencing normal spraying and cylinder, make umbrella spray oil nozzle safety and reliable more with needle-valve head protection cover.
The technical solution adopted for the present invention to solve the technical problems is: a kind of umbrella spray oil nozzle with needle-valve head protection cover, one pair of precision pair that it is made up of needle-valve and needle-valve body.Be provided with the safety cover to the needle-valve head in the end of needle-valve body, when needle-valve was taken a seat, the lower end surface of this safety cover exceeded h than the lower end surface of needle-valve head, and the general range of h value is 0~1.0mm.
Above-mentioned safety cover can adopt the tapered annular structure of being made up of plane, circular arc and inclined-plane.This safety cover can circumferentially remove a part, forms 3~8 circumferential uniform taper fan-shaped pieces.
Above-mentioned safety cover also can adopt the tapered annular structure of being made up of plane and inclined-plane, or adopts the tapered annular structure of only being made up of the inclined-plane.
Above-mentioned safety cover also can adopt the cylindrical annular structure of being made up of plane and inner cylindrical surface.This safety cover also can circumferentially remove a part, forms 3~8 circumferential uniform cylindrical fan-shaped pieces.
The invention has the beneficial effects as follows: the umbrella spray oil nozzle of this band needle-valve head protection cover, owing to be provided with the safety cover of needle-valve head in the end of needle-valve body, when needle-valve was taken a seat, the lower end surface of this safety cover exceeded than the lower end surface of needle-valve head.Adopt this structure can not influence the spray characteristics of umbrella spray oil nozzle, spraying is reduced by the influence of air motion in the cylinder on the contrary, make the easier outside expansion of spraying, help the formation of inflammable mixture in the cylinder, and overcome the problem that umbrella spray injector valve head fractures easily in use and transportation process, improved the reliability of umbrella spray oil nozzle, the large-scale industrial application of spraying oil nozzle for umbrella provides the foundation.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is a kind of structural drawing that sprays oil nozzle with the umbrella of needle-valve head protection cover.
Fig. 2 is circumferential closed tapered annular safety cover enlarged view.
Fig. 3 is circumferential semi-open type tapered annular safety cover enlarged view.
Fig. 4 is another circumferential closed tapered annular safety cover enlarged view.
Fig. 5 is another circumferential closed tapered annular safety cover enlarged view.
Fig. 6 is circumferential closed cylindrical ring protection cover enlarged view.
Fig. 7 is circumferential semi-open type cylindrical annular safety cover enlarged view.。
Fig. 8 is that the A-A of Fig. 7 is to sectional view.
Among the figure: 1, needle-valve, 1a, needle-valve head, the lower end surface of 1b, needle-valve head, 2, needle-valve body; the lower end surface of 2a, safety cover, 3,7,10, the plane, 4, circular arc, 5,, 11,12, the inclined-plane; 6, taper fan-shaped piece, 8, inner cylindrical surface, 9, cylindrical fan-shaped piece.
Embodiment
In the embodiment shown in Fig. 1,2,3,4,5; one pair of precision pair that needle-valve 1 and needle-valve body 2 are formed; be provided with the safety cover to needle-valve head 1a in the end of needle-valve body 2, when needle-valve 1 was taken a seat, the lower end surface 2a of this safety cover exceeded 0.3mm than the lower end surface 1b of needle-valve head.Fig. 2 illustrates safety cover and adopts the tapered annular structure of being made up of plane 3, circular arc 4 and inclined-plane 5.Fig. 3 illustrates safety cover and is circumferentially removing a part, forms 6 circumferential uniform taper fan-shaped pieces 6.Fig. 4 illustrates safety cover and adopts the tapered annular structure of being made up of plane 10 and inclined-plane 11.Fig. 5 illustrates safety cover and adopts the tapered annular structure of being made up of inclined-plane 12.
In the embodiment shown in Fig. 6,7,8; one pair of precision pair that needle-valve 1 and needle-valve body 2 are formed; be provided with the safety cover to needle-valve head 1a in the end of needle-valve body 2, when needle-valve 1 was taken a seat, the lower end surface 2a of this safety cover exceeded 0.3mm than the lower end surface 1b of needle-valve head.Fig. 6 illustrates safety cover and adopts the cylindrical annular structure of being made up of plane 7 and inner cylindrical surface 8.Fig. 7 illustrates safety cover and is circumferentially removing a part, forms 6 circumferential uniform cylindrical fan-shaped pieces 9.Fig. 8 illustrates A-A among Fig. 7 to sectional view, and shows 6 circumferential uniform cylindrical fan-shaped pieces 9.