Technical Description

The following is a technical summary of the Dymatic Bidirectional Rotary Piston Chamber as explained in the RPC patent

 

An object of this disclosure is a hydraulic piston machine having a rotary toroidal piston chamber in which the piston functions with continuous motion in one direction. In this disclosure the piston's motion within the chamber is relative motion while the

chamber rotates and the piston is held stationary.

 

A further object of this disclosure is a hydraulic piston machine having a rotary toroidal piston chamber with one or more stationary pistons in which the pistons function with continuous motion and the chamber motion is continuous, with steady water flow and steady torque, and wherein the chamber motion is bidirectional for motor or pump operation.

 

Another object of this disclosure is a hydraulic piston machine having a rotary toroidal piston chamber with one or more stationary pistons that turn a drive shaft without a crank and mechanical linkages.

 

In accordance with this disclosure a rotary piston chamber hydraulic machine includes at least one stationary piston and two retractable gates for each piston within a toroidal chamber mounted on a wheel fixed to an axle on which it rotates. With multiple pistons within the chamber a partition of the interior space is formed between pistons. Each partition has an input and output port. The cross section of the toroidal chamber is a rectangle with three sides composed of a bottom and two sidewalls with an open top. The open top allows the external mechanical connection to the piston, the "piston support", to hold the piston stationary against large pressure force while the chamber rotates. The open top is closed by a stationary cover that encircles and seals the open chamber. Openings in the cover are provided for each piston support to pass through and be sealed. The cover also has openings for the input and output ports. A stationary cover that can withstand and contain water under pressure within the chamber with a pressure tight seal between the cover and the rotating chamber is an important and essential part of this disclosure.

 

The pressure tight seal between the stationary chamber cover and the rotating chamber is achieved through the use of a seal channel at the top of each chamber sidewall. The cylindrical cover is provided with a flange along the edge on each side. With the cover in position the flange extends into the center of the seal channel between the channel bottom and the channel cap. The space below and above the flange is filled with resilient sealing material that provides the pressure tight seal. Adhesive on the channel bottom holds the sealing material in place as the chamber rotates. A low friction film on the sealing material contact surface and a low friction coating on the cover flange provide a sliding seal with minimal friction.

 

Within the toroidal chamber there are radially movable gates that provide closed sections within the chamber. Each gate retracts to an open position as it passes a stationary piston which allows for unobstructed continuous rotation of the chamber. Control of the gate's open or closed position is by cam means external to the chamber. This allows the chamber interior to remain simple and symmetric which enables bidirectional operation of the machine.

 

Rotation of the chamber and axle/drive shaft is achieved without a cranking mechanism and its mechanical linkage. Each piston has an input and an output port, without valves, within a partition of the chamber. When the machine is operating as a motor, water under pressure enters through the input port into the closed section of the chamber formed by the stationary piston at one end and the closed gate, which is fixed in the chamber, at the other end. The force of the water pressure on the piston and the gate acts to push them apart. In this disclosure it is the chamber that moves and not the piston, which is held stationary, the reverse of the conventional piston in a cylinder. The force of water pressure on the gate provides the torque to rotate the chamber. With a steady input water flow the chamber and the axle/driveshaft will turn at constant velocity continuously and with constant torque.

 

Advantages of the Rotary Piston Chamber Machine:

• Eliminates need for cranking mechanism and its linkage

• Eliminates need for valves at input and output ports

• Continuous rotation of chamber with steady flow and steady torque

• Efficient water use

• Hoist and hold capable (holds load with no water flow)

• Chamber is simpler (has no internal cams)

• Bidirectional operation of hydraulic motor or pump

• Multiple pistons, each with I/O ports, in one piston chamber provide:

• High Power (megawatt with large pistons & chamber diameter)

 

Variety of applications and some unique functions:

• Water powered sump pump, hand cranked bilge pump

• Vehicle powered by water pressurized by compressed air

• Air compressor (done by pumped water pressure)

• Pumped energy storage (water or electric powered to elevated water reservoir or deep water compressed air)

• Hydroelectric power (where turbines may or may not go)

• Energy harvesting (wind farm, many mills pump water to one hydroelectric generator)

 

Also in accordance with the objects of this disclosure, a hydraulic device is achieved comprising a rotatable toroidal piston chamber mounted on a chamber wheel affixed to an axle, an external frame supporting the axle. At least two stationary pistons within the piston chamber are held in fixed positions by external support means attached to the external frame. At least four gates within the piston chamber rotate with the chamber and when closed transmit fluid pressure forces to the chamber wheel. The pistons and gates are evenly spaced around the toroidal chamber separating the chamber into partitions, one partition for each piston The gates are adapted to be opened and closed by gate control means. A stationary cover for the chamber closes and seals the opening around the piston chamber with openings in the cover for the at least two stationary pistons and fluid input ports and output ports on each side of each of the partitions.

 

Also in accordance with the objects of this disclosure, a hydraulic device is achieved comprising a rotary toroidal piston chamber having a rectangular space with a bottom, two sidewalls, and an open top. At least one stationary piston and two retractable gates for each piston are within the toroidal chamber mounted on a chamber wheel fixed to an axle on which it rotates. A piston support for each piston is configured to hold the piston stationary while the piston chamber rotates. The pistons and gates are evenly spaced around the toroidal chamber separating the chamber into partitions, one partition for each piston. A stationary cover encircles and seals the open top of the piston chamber wherein openings through the stationary cover allow each of the piston supports to pass through and be sealed. An input port opening and an output port opening are in the stationary cover for each partition. The piston chamber rotates by reacting directly to continuous hydraulic force on the stationary piston.

 

Also in accordance with the objects of this disclosure, a hydraulic device is achieved comprising a rotary toroidal piston chamber having a rectangular space with a bottom, two sidewalls, and an open top. Four stationary pistons and two retractable gates for each piston are within the toroidal chamber mounted on a chamber wheel fixed to an axle on which it rotates, wherein the pistons and the gates are evenly spaced around the toroidal chamber separating the chamber into four partitions. A piston support for each piston is configured to hold the piston stationary while the piston chamber rotates. A stationary cover encircles and seals the open top of the piston chamber wherein openings through the stationary cover allow each of the piston supports to pass through and be sealed. An input port opening and an output port opening are in the stationary cover for each partition. The piston chamber rotates by reacting directly to continuous hydraulic force on the stationary pistons.

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