The present invention relates to an inlet for a hydrodynamic screw, the inlet comprising—a first end connectable to a hydrodynamic screw, the first end having a first opening—a second end for transporting water through the inlet towards the first end, the second end having a second opening, —an inlet body connecting the first end and the second end, the inlet body comprising a hollow that extends through the inlet body and connects the first opening and the second opening, wherein the inlet has a first diameter at the first opening and a second diameter at the second opening, the second diameter being larger than the first diameter, and wherein the nlet further comprises a ridge arranged on an inner surface of the hollow in a helix, the ridge having a height that increases towards the first end. The invention also relates to a hydrodynamic screw.

A modular wave energy converter includes: a forward attachment frame; forward guide rails coupled to the forward attachment frame; a forward paddle coupled to the forward guide rails; and one or more forward tethers coupled to the forward paddle and the shaft. A combination of heave and surge forces from waves of water causes the forward paddle moves up and down the forward guide rails. The movement of the forward paddle moves the one or more forward tethers. The movement of the one or more forward tethers causes the shaft to rotate via the rotation of winches. The winches are configured with a one-way clutch, which allows the shaft to rotate in a first direction but not a second. The converter has the same structure on the aft side, including an aft paddle. The forward and aft paddles are positioned vertically or inclined.

A width-adjustable packaging bag shaper, a bag maker, a packaging machine, and a method. The packaging machine including the bag maker, a traction device and a heat sealing device are respectively arranged above the bag maker, and a width adjustment device adjusts the distances between different sub bottom plates in a front bottom plate and a rear bottom plate by using a leadscrew and slide block mechanism, and then adjusts the width of a bottom plate. The leadscrew and slide block mechanism is used as the width adjustment device of the automatic width-adjustable noodle packaging bag shaper system, and four bottom plates are respectively fixed to the width adjustment device, so the leadscrew and slide block mechanism in operation is accurate in range of adjustment, is suitable for various widths of packaging bags, and has very important significance for the three-dimensional shaping effect of the packaging bags.

A power generation system includes a flotation assembly configured to float in water and a first harnessing assembly coupled to the flotation assembly and disposed in an airflow above the water. The first harnessing assembly is configured to harness the airflow to create a first rotational energy. The system also includes a second harnessing assembly coupled to the flotation assembly and disposed in the water. The second rotational assembly is configured to harness movement of the water to create a second rotational energy. The flotation assembly also includes a generating module to convert the first and second rotational energies into electrical energy.

An active resonance C-type buoyant flap wave energy converter includes a rigid frame, a flap, a mass center adjustment assembly and a power generation assembly. The rigid frame is connected to a marine facility, and includes a main body and a support shaft provided at a bottom thereof. The flap is swingingly arranged on the support shaft. The flap is located under water surface, and swings back and forth around the support shaft under an action of a wave. The mass center adjustment assembly is configured to adjust a mass center of the flap to make a natural period of the flap same as a wave period, so as to achieve a resonance between the flap and the wave. The power generation assembly is arranged on the support shaft and is located in the flap.

An apparatus that floats at the surface of a body of water over which waves pass, causing a nominally vertical axis of the apparatus to tilt away from an axis normal to the resting surface of the body of water. Tilting allows a fluid to flow through a channel that in an un-tilted apparatus would require the gravitational potential energy of the fluid to increase (i.e., to flow uphill), but, because of the tilt allows the fluid to flow through the channel in a downhill direction. Successive wave-driven tilts of the apparatus incrementally raise water to a head from which a portion of its gravitational potential energy can be converted to electrical power by causing the water to return to a lower level by flowing through a water turbine, or through some other apparatus that performs a useful function when supplied with a flow of high-pressure water.

A device for producing energy includes an air-towed vessel, and at least one water current turbine linked to the vessel by at least one electric cable. The water current turbine is linked to the vessel by at least one mechanical linking cable to be towed by the vessel. The water current turbine is spaced apart from the vessel, which makes it possible to increase the diameter of the turbine and to reduce the interactions between the turbine and the vessel. Moreover, it is then possible to provide a plurality of water current turbines towed by the same vessel.

A barge generator adapted to generate electrical power from surface currents of a body of water. The barge generator has a plurality of hull portions that form one or more tunnels along the length of the vessel. Hydrodynamic screws are received in the tunnels and coupled to an electrical generator such that water currents communicated through the tunnel impart rotational movement of the screw. A deployable curtain is extensible to funnel the currents towards the barge generator to increase the volume and velocity of water carried through the tunnel.

An exemplary turbine system for generating hydroelectric power. The exemplary turbine system is generally installed in shallow waterways and accelerates water flowing therein. The accelerated water generates power via spinning one or more turbine rotors of the system. An exemplary method for installing the turbine system is disclosed. The method includes first lowering a turbine system base into the shallow waterway, where the base includes a depression for accepting a mortise insert. The mortise insert includes one or more sockets for accepting notches in a base plate, where the base plate is coupled to one or more turbine rotors. The base plate mates with the mortise insert for ease of installation and securely positioning the one or more turbine rotors within the system.

The invention discloses a heavy hammer type wave power generation method and device. According to the invention, under the action of wave power and gravity, a floating box enables driving sprockets and guiding sprockets to turn leftwards or rightwards along a chain, the driving sprockets turn leftwards or rightwards by means of a speed-increasing gear in a speed-increasing box and a transmission mechanism for converting bidirectional swinging to unidirectional rotation, a generator shaft always rotates in one direction to generate power. According to the invention, a wave energy collecting method is simple and easy, a large amount of wave energy can be collected, energy converting efficiency is high, the structure is simple, manufacturing costs are low, maintenance is avoided for a long time, service life is long, safety is good, a wave power generation station can be established by networking.