CLIAMS:I claim:
1. A solenoid valve injector (10) said solenoid valve injector (10) comprising at least,
- an armature (12) of a solenoid actuating mechanism;
- a ball valve (14) located to one end of said armature (12) said ball valve (14) adapted to be lifted from a valve seat (16) in dependence of an actuation of the solenoid;
characterized in that said ball valve (14) having a slot (18) in proximity of valve seat in a manner such as to guide fuel particle towards said slot (18).
2. The solenoid valve injector (10) as claimed in claim 1, wherein said ball valve (14) having a slot (18) in proximity of the sealing line defining a line contact between the ball valve (14) and the valve seat (16).
,TagSPECI:Field of the invention
[0001] This disclosure relates to a solenoid valve injector.
Background of the invention:
[0002] A published patent application CN202082025 disclosure a solenoid valve injector. A plane opening and closing structure of a diesel engine high-pressure common rail injector includes a control valve coupler and a guide valve seat. A seal ball in the control valve coupler is a plane seal ball; an annular seal plane, a throttling pit, a throttling pit plane seal and a rapid pressure release structure are arranged on the upper end surface of the guide valve seat; the diameter of the seal plane of the plane seal ball is equal to the outer diameter of the annular seal plane; and the hardness, the planeness and the surface roughness of the seal plane and the annular seal plane all achieve the design requirements.
Brief description of the accompanying drawings:
[0003] An embodiment of the disclosure is described with reference to the following accompanying drawings;
[0004] Figure 1 illustrates a sectional view of a part of the solenoid valve injector in accordance with this disclosure;
[0005] Figure 2 illustrates a blown-up view of the part marked A in figure 1; and
[0006] Figure 3 illustrates a blown-up view of the part marked B in figure 2.
Detailed description of the embodiments:
[0007] Figure 1 illustrates a sectional view of a part of the solenoid valve injector 10 in accordance with this disclosure. The solenoid valve injector 10 comprises at least, an armature 12 of a solenoid actuating mechanism and a ball valve 14 located to one end of the armature 12. The ball valve 14 adapted to be lifted from a valve seat 16 in dependence of an actuation of the solenoid. The solenoid valve injector 10 is characterized such that the ball valve 14 has a slot 18 in proximity of the valve seat 16 in a manner such as to guide fuel particle towards the slot 18. The ball valve 14 has a slot 18 in proximity of the sealing line defining a line contact between the ball valve 14 and the valve seat 16.
[0008] For easier understanding of the core of this disclosure the construction of the solenoid valve injector 10 will be described in detail with reference to figure 1, 2 and 3. This construction does not form the point of novelty of this disclosure, but is provided to highlight the need of concept in accordance with this disclosure. A person skilled in the art would appreciate the need of this disclosure. As seen in figure 1, the solenoid valve injector 10 comprises an injector body 20 has a central bore which accommodates plurality of components such as an injector needle and the injector valve 22. The injector valve 22 also has a bore 24 as seen in figure 2. The bore 24 has a first part 24a which accommodates the injector needle and a second part 24b. The second part 24b of the injector valve 22 opens up into a diverging cone. The ball valve 14 of the solenoid valve injector 10 abuts the diverging cone of the injector valve 22. The part of the injector valve 22 where the ball valve 14 abuts the diverging cone is defined as the valve seat 16. As seen in figure 3, the contact of the ball valve 14 against the valve seat 16 is a line contact.
[0009] The ball valve 14 is fixed to the armature 12 of the solenoid valve injector 10 by means of a pin 26 as seen in figure 1. During the non-operative state of the solenoid valve injector 10 the armature 12 and the pin 26 holds the ball valve 14 tightly against the valve seat 16. While the ball valve 12 is held tightly against the seat a gallery 28 (as seen in figure 2) is formed on the side of the ball valve 14 which facing the diverging part of the diverging cone of the injector valve 22. Thus during the non-operative state of the solenoid valve injector 10 hence no fuel flows from bore 24 into the gallery. During the non-operative state a pressure existing in the gallery is lower than the pressure of fuel in the bore 24.
[00010] During the operation of the solenoid valve injector 10 the solenoid actuating mechanism (not shown in figures) actuates the solenoid which causes the armature 12 to lift. As the armature 12, the pin 26 and the ball valve 14 is lifted from the valve seat 16. As the ball valve 14 is lifted the high pressure fuel in the bore 24 rushes into the gallery 28. During the flow of fuel from the bore 24 towards the gallery 28 fuel particles bounces against the ball valve 14 and fly back to the valve seat 16. When the solenoid is de-energized the armature 12 moves in a manner such as push the ball valve 14 against the valve seat 16. As soon as the ball valve 14 abuts against the valve seat 14, some particles of fuel get pressed against the valve seat 14. Over many cycles of operation of the solenoid valve injector 10, the fuel particles which press against the valve seat 16 causes deformation in the valve seat area. The deformation results in erosion of the material near the valve seat 16. Due to erosion of the material near the valve seat 16, the ball valve 14 will not be able of fully seal the areas around the eroded valve seat 16. This would lead to leakage of fuel and also lead to unnecessary injections in case of heavily eroded injectors.
[00011] In accordance with this disclosure, the solenoid valve injector 10 comprises a ball valve 14 which has a slot 18. The slot 18 is provided in proximity of the valve seat 18. Thus by providing the slot 18 in proximity of the valve seat 18, the slot 18 is in proximity of the sealing line defining a line contact between the ball valve 14 and the valve seat 16.
[00012] During operation of the solenoid valve injector 10, when the solenoid is de-energized and the armature 12 pushes the ball valve 14 against the valve seat 16, a low pressure is created in the slot 18 and the fuel particles are guided towards the slot 18. Thus no particles get trapped at the valve seat 16. Even if some fuel particle exist the fuel particles pass the valve seat 16 tangentially. Due to tangential movement of the fuel particles the bounce back can happen only outside the valve seat area. The slot 18 in the ball valve 14 does not provide any bounce back surface to the fuel particles this is different from the phenomenon due to ball valve existing in the state of the art. Thus the fuel particle are either guided into the slot 18 or move tangentially from the valve seat 16 toward the gallery 28. Since there is no bounce back surface for the fuel particles the erosion of the material near the valve seat 16 is avoided. This not only increases the life of the solenoid valve injector but also the overall efficiency of a fuel injection system which uses a solenoid valve injector 10 as disclosed herein.
[00013] It should be understood that embodiments explained in the description above are only illustrative and do not limit the scope of this disclosure in terms of the manner in which the slot is made, dimensions of the slot and the like. Many such embodiments and other modifications and changes in the embodiment explained in the description are envisaged. The scope of the invention is only limited by the scope of the claims.