Old-fashioned single-acting beam pumping engine on the atmospheric…
Old-fashioned single-acting beam pumping engine on the atmospheric principle, with chain connection between piston-rod and a segment at end of beam. The cylinder is open at top. Very low pressure steam is admitted below piston, and the weight of pump-rod, etc., at the other end of beam, helps to raise piston. Steam is then condensed by injection, and a vacuum thus produced below piston, which is then forced down by atmospheric pressure thereby drawing up pump-rod.
Only the input is driven; every other part of this model moves by physics (MuJoCo), and its ratios are measured. Run it live, change its parameters, or switch the friction off to see the output stop.
- Modelled as
- The beam turns on O and is rocked through 0.15 radian each way. Its near end is an arch-head, a circle of 30 cm radius about O. A chain of 16 rigid links on pins is made fast to the top of the arch. Nine links lie on the arch's face, and seven hang straight down to the piston-rod's cross-head, which runs on an upright slide. The links are joined by pins; the chain is laid on the arch only by contact, and the cross-head hangs on the last pin by contact. The piston's weight keeps the chain taut. A weight on the far end stands for the pump-rod. The beam is the only driven part.
- Measured
- The piston-rod rises and falls 9.3 cm, 0.305 m per radian of the beam, in step with it. That is the arch's radius out to the chain's line, so the chain wraps on and off the arch without slack. The deepest contact is 0.014 mm.
- Notes
- Brown gives no sizes. Steam, injection and the vacuum are not simulated. The beam is driven both ways, and the piston's weight stands in for the atmosphere's push on the down-stroke. The pump-rod itself is left out; a weight on the beam's far end stands for it. The chain hangs from the arch's level point, so the rod stays on its upright line without a guide; the slide only carries it.
Film (MP4) · Still (PNG) · Spec (YAML) · Model (MJCF)
