Claims
- 1. An incompressible fluid injector assembly the combination comprising:
- housing means having a first cylindrical bore formed therein and a plunger reciprocally disposed in said first bore for defining a pump chamber therein;
- an inlet opening communicating with said pump chamber;
- a second bore having stepped diameter coaxially disposed cylindrical portions defining a high pressure chamber coaxial of and communicating with said pump chamber and including a high pressure outlet opening coaxial thereof;
- a delivery valve mounted in said high pressure chamber and opening away from said plunger for controlling the flow of pressurized fluid from said pump chamber to said high pressure chamber and high pressure outlet, said delivery valve comprising an annular disc valve including a central bore defining an opening through said disc, and said annular disc including means defining an annular seat surrounding said opening;
- first compression spring means mounted within said high pressure chamber for biasing said delivery valve to a closed position;
- stop means for limiting the travel of said delivery valve for reducing travel time of said valve and for preventing bottoming of said first compression spring means; and,
- damping means comprising a reverse check valve including second compression spring means carried by said delivery valve and mounted in said opening in said delivery valve and engaging said annular seat for blocking flow of fluid through said opening toward said high pressure chamber, and responsive for providing unobstructed flow of fluid back to said pump chamber from said high pressure chamber and outlet at a predetermined pressure for reducing secondary pressure in incompressible fluid delivered by said pump for preventing cavitation in said incompressible fluid, wherein said check valve includes an elongated stem connected to the center of a disc element and extending away from said plunger;
- said second compression spring means is connected between said stem and said delivery valve for urging said reverse valve to the closed position; and
- guide means detachably carried by said delivery valve for engaging one diameter of said second bore for guiding said delivery valve axially of said first and second bores within said high pressure chamber and for engaging a shoulder defined by said stepped bore for defining said stop means.
- 2. The injection assembly of claim 1 including adjusting means for said second compression spring means for adjusting the tension of said second spring means to a range for preventing cavitation and for preventing return of an excess amount of said fluid to said pump chamber.
- 3. An incompressible fluid injector assembly the combination comprising:
- housing means having a first cylindrical bore formed therein and a plunger reciprocally disposed in said first bore for defining a pump chamber therein;
- an inlet opening communicating with said pump chamber;
- a second bore having stepped diameter coaxially disposed cylindrical portions defining a high pressure chamber coaxial of and communicating with said pump chamber and including a high pressure outlet opening coaxial thereof;
- a delivery valve mounted in said high pressure chamber and opening away from said plunger for controlling the flow of pressurized fluid from said pump chamber to said high pressure chamber and high pressure outlet, said delivery valve comprising an annular disc valve including a central bore defining an opening through said disc, and said annular disc including means defining an annular seat surrounding said opening;
- first compression spring means mounted within said high pressure chamber for biasing said delivery valve to a closed position;
- stop means for limiting the travel of said delivery valve for reducing travel time of said valve and for preventing bottoming of said first compression spring means; and,
- damping means comprising a reverse check valve including second compression spring means carried by said delivery valve and mounted in said opening in said delivery valve and engaging said annular seat for blocking flow of fluid through said opening toward said high pressure chamber, and responsive for providing unobstructed flow of fluid back to said pump chamber from said high pressure chamber and outlet at a predetermined pressure for reducing secondary pressure in incompressible fluid delivered by said pump for preventing cavitation in said incompressible fluid, wherein said check valve includes an elongated stem connected to the center of a disc element and extending away from said plunger, and
- said second compression spring means is connected between said stem and said delivery valve for urging said reverse valve to the closed position;
- guide means for guiding said delivery valve axially of said first and second bores within said high pressure chamber;
- adjusting means for said second compression spring means for adjusting the tension of said second spring means to a range for preventing cavitation and for preventing return of an excess amount of said fluid to said pump chamber, said adjusting means includes disc means for insertion between one end of said second spring means and said delivery valve;
- said guide means comprises a general triangular shaped disc mounted on said delivery valve having outer arcuate guide surfaces engaging the walls of said second bore; and,
- said stop means comprises the outermost portions of said triangular shaped disc engaging an annular shoulder defined between portions of said stepped bore.
Parent Case Info
This is a continuation of Ser. No. 390,540, filed Aug. 22, 1973, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (2)
Number |
Date |
Country |
1,134,166 |
Apr 1957 |
FR |
399,858 |
Oct 1933 |
UK |
Continuations (1)
|
Number |
Date |
Country |
Parent |
390540 |
Aug 1973 |
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