Anti-rejection device for an injection valve
View Patent ↗Various embodiments include an anti-reflection device for preventing the reflection of pressure waves inside an injection valve comprising: a cylindrical base body with a longitudinal axis L to be orientated parallel to a propagation direction of a pressure wave; a first section adjacent to a first base side having a cavity shaped as a hollow cone, a longitudinal axis of the cone orientated parallel to the longitudinal axis L of the device, and a base area of the cone coplanar with the first base side of the cylindrical base body; and a second section adjacent to the second base side comprising a through-hole in fluid communication with the cone, hydraulically linking the second base side with the first base side. The through-hole makes an angle α with the longitudinal axis L, wherein 40°≤α≤60°.
1. An anti-reflection device for preventing the reflection of pressure waves inside an injection valve, the anti-reflection device comprising:
an essentially cylindrical base body with a first base side, a second base side, and an outer surface;
a longitudinal axis L intended to be orientated parallel to a propagation direction of a pressure wave, the longitudinal axis penetrating the first base side and the second base side;
a first section adjacent to the first base side having a cavity shaped as a hollow cone, a longitudinal axis of the cone orientated parallel to the longitudinal axis L of the device, and a base area of the cone coplanar with the first base side of the cylindrical base body; and
a second section adjacent to the second base side comprising a through-hole, in fluid communication with the cone, hydraulically linking the second base side with the first base side;
wherein the through hole makes an angle α with the longitudinal axis L, wherein −40°≤α≤60°.
2. The anti-reflection device according to claim 1 , wherein the hollow cone has an angle of opening γ, wherein 30°≤γ≤100°.
3. The anti-reflection device according to claim 1 , further comprising up to six through-holes in the second section.
4. The anti-reflection device according to claim 1 , wherein the through hole has a diameter d, wherein 0.2 mm≤d≤1 mm.
5. An injection valve, comprising:
a valve body with a central longitudinal axis comprising a cavity with a fluid inlet portion and a fluid outlet portion;
a valve needle axially moveable in the cavity, the valve needle preventing a fluid flow through the fluid outlet portion in a closed position and releasing the fluid flow through the fluid outlet portion in further positions;
an electro-magnetic actuator unit to actuate the valve needle; and
one anti-reflection device arranged inside the cavity, the anti-reflection device comprising:
an essentially cylindrical base body with a first base side, a second base side, and an outer surface;
a longitudinal axis L intended to be orientated parallel to a propagation direction of a pressure wave, the longitudinal axis penetrating the first base side and the second base side;
a first section adjacent to the first base side having a cavity shaped as a hollow cone, a longitudinal axis of the cone orientated parallel to the longitudinal axis L of the device, and a base area of the cone coplanar with the first base side of the cylindrical base body; and
a second section adjacent to the second base side comprising a through-hole in fluid communication with the cone, hydraulically linking the second base side with the first base side;
wherein the through-hole makes an angle α with the longitudinal axis L, wherein 40°≤α≤60°.
6. The injection valve according to claim 5 , wherein the anti-reflection device is arranged upstream of a fuel filter element of the injection valve.
7. The injection valve according to claim 5 , wherein the anti-reflection device is integrated into a fuel filter element of the injection valve.
8. The injection valve according to claim 5 , wherein the anti-reflection device is arranged downstream of a fuel filter element of the injection valve.
9. The injection valve according to claim 5 , wherein the anti-reflection device is arranged downstream of an armature of the electro-magnetic actuator unit.
10. The injection valve according to claim 5 , wherein the anti-reflection device is mounted inside the cavity with the first base side oriented towards the fluid outlet portion and the second base side oriented towards the fluid inlet portion.