초록 ▼

The invention provides a fluid injector assembly for the injection of a fluid including an injector body having distal and proximal ends, a fluid inlet disposed towards the proximal end, a fluid outlet disposed towards the distal end, and a fluid pathway extending therebetween the inlet and the outl

The invention provides a fluid injector assembly for the injection of a fluid including an injector body having distal and proximal ends, a fluid inlet disposed towards the proximal end, a fluid outlet disposed towards the distal end, and a fluid pathway extending therebetween the inlet and the outlet. An injector needle is rotatably disposed at least partially in the injector body and is moveable between an open and closed position. The proximal end of the injector needle has a tip that is configured to sealably close the fluid outlet. The fluid injector assembly includes a first threaded region that cooperates with a corresponding threaded region on the needle, and first and second cooperating coupling members that are arranged axially of the injector needle. The first coupling member is attached to a motor, and the second coupling member is attached to a distal end of the injector needle. The motor is configured to rotate the injector needle within the injector body which causes the threaded region of the needle to be driven in the first threaded region of the fluid injector assembly to thereby move the injector needle along a longitudinal axis of the fluid injector assembly between the open and closed positions.

대표청구항 ▼

1. A fluid injector assembly comprising: an injector body having a distal end and a proximal end;a fluid inlet disposed towards the proximal end of the injector body;a fluid outlet disposed towards the distal end of the injector body;a fluid pathway extending between the inlet and the outlet;a needl

1. A fluid injector assembly comprising: an injector body having a distal end and a proximal end;a fluid inlet disposed towards the proximal end of the injector body;a fluid outlet disposed towards the distal end of the injector body;a fluid pathway extending between the inlet and the outlet;a needle rotatably disposed at least partially in the injector body and being moveable between an open and closed position, the needle having a tip at a proximal end thereof, the tip being configured to sealably close the fluid outlet;a first threaded region that cooperates with a corresponding threaded region on the needle; andfirst and second cooperating coupling members arranged axially of the needle, the first coupling member being attached to a motor, and the second coupling member being attached to a distal end of needle, wherein at least one of the coupling members includes at least one connecting member that is slidingly inserted into a corresponding cavity on the other coupling member, wherein rotation of the first coupling member by the motor also rotates the second coupling member and the needle, which in turn causes the threaded region of the needle to be threaded through the first threaded region so that the needle is rotably driven between the opened and closed positions, and wherein driving of the needle causes the at least one connecting member to slide in or out of the corresponding cavity. 2. The fluid injector assembly of claim 1, wherein the first and second coupling members each comprise a plurality of connecting members and corresponding cavities. 3. The fluid injector assembly of claim 1, wherein the first and second coupling members each comprise at least three connecting members and at least three cavities that each correspond to an individual connecting member on the opposite coupling member. 4. The fluid injector assembly of claim 1, wherein the first threaded region is arranged in a collar disposed adjacent to the distal end of the injector body. 5. The fluid injector assembly of claim 1, wherein the first threaded region is arranged in the injector body. 6. The fluid injector assembly of claim 1, further comprising a cooling jacket circumferentially surrounding said injector body, the cooling jacket being configured to receive and recirculate a cooling fluid therein to maintain a fluid within the fluid injector assembly at a desired temperature. 7. The fluid injector assembly of claim 6, wherein the cooling fluid comprises the fluid to be injected by fluid injector assembly. 8. The fluid injector assembly of claim 6, further comprising a fluid source that is in fluid communication with the fluid inlet and the cooling jacket. 9. The fluid injector assembly of claim 6, further comprising a center fitment disposed towards the proximal end of the injector body, the center fitment being configured and arranged to align the injector needle with the fluid outlet. 10. The fluid injector assembly of claim 1, wherein the proximal end of the injector body includes at least one conically-shaped surface that is configured and arranged to cooperate with a corresponding conically shaped surface on the proximal end of the injector needle. 11. The fluid injector assembly of claim 1, wherein the fluid pathway comprises a longitudinally extending annular shaped passageway. 12. An exhaust emission control system for an engine comprising: a housing having inlet for receiving an exhaust stream from the engine and an outlet for discharging the exhaust stream;a urea source;the fluid injector assembly of claim 1 in fluid communication with said urea source, the fluid injection system being configured to discharge a stream of urea into the exhaust stream; anda catalyst disposed downstream of the fluid injector assembly. 13. The exhaust emission control system of claim 12, wherein the catalyst is a selective catalytic reduction converter. 14. The exhaust emission control system of claim 12, wherein the engine is a diesel engine. 15. The exhaust emission control system of claim 12, further comprising a particulate filter disposed upstream or downstream of the fluid injector assembly. 16. The exhaust emission control system of claim 15, wherein in one or more heating elements are disposed upstream of the particulate filter. 17. The exhaust emission control system of claim 16, wherein the system includes at least two heating elements that are controlled independently of each other such that the an exhaust stream temperature in the range of about 450 to 900° F. can be maintained.