This standardised fuel pumping module is used within a forecourt fuel dispenser. Improved fluid flow paths include a shaped conduit between an output of a rotary fuel pump and a vortex air separator. Internal dimensions are optimized. A swash pump cartridge option with a variable speed drive provides up to at least 140 air-free l/min from the dispenser. Torque and motor speed signals allow comparisons with fuel meter revolution rate to indicate fraud or faults during delivery of fuel without extra transducers. Means to shut down the dispenser and raise an alarm are provided.
F04B 49/00 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups
A rotatable drive shaft in the swash pump or turbine for liquids is supported by one bearing at each end. An integrated motor or dynamo uses the same two bearings. The compound first bearing supports a slanted section of the drive shaft placed inside the inner swash sphere, and transfers rotational power to the attached nutatable swash plate. The second bearing confines rotation of the drive shaft in a defined axis. Either one of the bearings is made to prevent axial movement of the drive shaft, preventing swash pump misalignment. A resilient drive, and an immersed pump are described.
A method of operating a vapor recovery system that recovers vapors expelled from a vehicle during refueling at a fuel dispensing point and returns the vapors to an underground storage tank through a vapor flow path that is in fluid communication with an air to liquid regulator valve and a vapor pump. The method includes dispensing fuel into the vehicle through the fuel dispensing point, regulating an amount of vapor that is recovered through the fuel dispensing point with the air to liquid regulator valve in proportion to the fuel dispensed into the vehicle, detecting a parameter of the vapor recovery system, and maintaining a substantially constant pressure level in a first portion of the vapor return path that is disposed between the vapor pump and the air to liquid regulator valve.
A swash pump for compressible fluids uses sealing contacts made between the nutatable swash plate and the fixed cone plates to centre and locate the inner swash sphere which slides against two resiliently mounted ring seals only, minimising pump friction. A slanted end of a common drive shaft supporting and turned by the rotor of an integrated, variable speed motor causes nutation of the sphere. All bearings, especially axially slidable roller bearings inside the sphere, may settle in position with respect to the common shaft for least frictional loss. This pump is also adapted for pumping explosive gases.
A swash-plate machine for pumping fluids uses dual swash plates in complementary or mirror-image orientation. The vibration that is generated as a reaction to forced nutatory motion imposed on a single swash plate is thereby largely cancelled. Rotated orientation of the divider plate position in one chamber with respect to the other (preferably 90 degrees difference) provides four outputs per revolution instead of the two available from both sides of a single swash plate. Improved bearings for the part-spherical swash plate base permits only oscillatory movement for that part and facilitate better sealing.
A swash-plate pump for fluids uses counterbalancing means within the rotating drive shaft to minimise vibration caused by the couple of the nutating swash plate. Resilient internal seals include radial vanes extending from the cone plate to contact the adjacent side of the swash plate, and a peripheral ring seal between the swash plate and the inner spherical part of the outer housing, to raise efficiency by reducing backflow. Resilient seals reduce the need for precision, so many plastics parts may be used. Carbon fibre leaf valves aid efficiency.
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