초록 ▼

A tip shut-off fluid injector F has its injection device 1 inset to a fixed female interlocking terminal 2 when in the firing position with which a change-over valve 4 is connected by pipes P or is made integral. The terminal 2 includes valves 8 and 9 and, optionally, a by-pass valve 10. A gearbox 1

A tip shut-off fluid injector F has its injection device 1 inset to a fixed female interlocking terminal 2 when in the firing position with which a change-over valve 4 is connected by pipes P or is made integral. The terminal 2 includes valves 8 and 9 and, optionally, a by-pass valve 10. A gearbox 12 connects between the valves 8, 9 and 10 and a handwheel 11. Rotation of the handwheel 11 inserts or retracts the injection device 1 to or from the firing position and also, via the gearbox 12, rotates the valves 8, 9 and 10 between open and closed positions. Before the injection device 1 can be retracted, the handwheel 11 must be initially rotated to rotate the valves 8 and 9 to closed positions to isolate the fluid supply from the injection device 1 and, optionally, to open the by-pass valve 10 to allow fluid to circulate from the supply through the terminal 2 back to return. Conversely, it is not until the injection device 1 is inserted that the valves 8 and 9 can be rotated by the handwheel 11 to open positions to communicate the fluid supply with the injection device 1 and, optionally, close the by-pass valve 10. The change-over valve 4 may include a direct flow path interconnecting the fluid supply and return when the injection device 1 is retracted. Other kinds of fluid injectors incorporating the invention are envisaged.

대표청구항 ▼

A fluid injector comprising: an injection device; fluid connection means fluidly connecting said injection device to a fluid delivery line external to said fluid injector, said injection device being removably mounted relative to said fluid connection means; valve means for controlling fluid communi

A fluid injector comprising: an injection device; fluid connection means fluidly connecting said injection device to a fluid delivery line external to said fluid injector, said injection device being removably mounted relative to said fluid connection means; valve means for controlling fluid communication between said fluid connection means and said injection device; actuator means, first initial rotary movement of which selectively rotates said valve means to an isolate position so as to fluidly isolate said fluid connection means from said injection device, first continued rotary movement of which in the same rotary direction effects removal of said injection device from said fluid connection means, said first continued rotary movement to effect said removal of said injection device being possible only after completion of said first initial rotary movement to rotate said valve means to said isolate position, second initial rotary movement of which in the opposite rotary direction effects insertion of said injection device relative to said fluid connection means to an operating position, second continued rotary movement of which in said opposite rotary direction rotates said valve means to a position at which said valve means fluidly communicates said fluid connection means with said injection device, said second continued rotary movement to rotate said valve means to its said position at which to fluidly communicate said fluid connection means and said injection device being possible only after completion of said second initial rotary movement to effect said insertion of said injection device to its said operating position; a gear train means between said valve means and said actuator means, said gear train means being rotatable in response to said first initial rotary movement and said second continued rotary movement of said actuator means to rotate said valve means to its said isolate and communicate positions, respectively; and cam track means associated with said fluid connection means and cam follower means associated with said actuator means, said cam follower means being movable relative to said cam track means in response to said first continued rotary movement and said second initial rotary movement of said actuator means to effect said removal and insertion, respectively, of said injection device from and to its said operating position; wherein said actuator means includes a rotatable handwheel shaft having a handwheel secured thereto, said cam follower means is fast with said handwheel shaft which is rotatable by said handwheel, said handwheel shaft is axially fast with said injection device, and said cam track means is fashioned on a stationary member of said fluid connection means and is so configured that rotation of said handwheel causes said cam follower means and said handwheel shaft as it rotates to move axially thereby inserting said injection device to, or removing said injection device from, said operating position in dependence on the sense of rotation of said handwheel; and wherein said cam track means leads into a slot formed in a second shaft and into which said cam follower means slides as said handwheel completes its said second initial rotary movement to effect said insertion of said injection device to its said operating position, said second shaft is in driving engagement with said gear train means, said second continued rotary movement of said handwheel engages said cam follower means with said slot to rotate said second shaft and hence said gear train means in one rotary sense to rotate said valve means to its said position to fluidly communicate said fluid connection means with said injection device, said first initial rotary movement of said handwheel engaging said cam follower means with said slot to rotate said second shaft and hence said gear train means in the opposite rotary sense to rotate said valve means to its said isolate position, said cam follower means slides from said slot as said handwheel completes its said first initial rotary movement to be engaged with said cam track means to effect removal of said injection device from its said operating position as said handwheel executes its said first continued rotary movement.