A convector includes a stator made up of an array of fixed, parallel, equally spaced, equally thick, thermally conductive plates attached to a relatively thick thermally conductive plate. Convectors are provided with a rotor that is made up of an array of flat, rotatable, parallel, equally spaced, equally thick discs. The discs of the rotor are placed between the plates of the stator at relatively close proximity from the walls of the stator plates. Furthermore, the discs are keyed or held in place with the help of spacers and compression nuts to a hollow or a solid shaft. A clearance aperture, circular in shape, is provided on the stator plates. The shaft is held in place at both ends by roller bearings that provide the means for the shaft to rotate. To impart rotational motion to the rotor, the shaft is attached to an external device such as a motor.

A centrifugal pump, and components thereof, operable at high speeds, is described under the present disclosure. A hard polymer sleeve can be applied to certain surfaces of a seal casing within the pump. If the sleeve is applied along surfaces near the center shaft, then the hard polymer will withstand the forces and pressures of the system. The hard polymer might not be used along the outer diameter, farther from the shaft, because velocities are higher the further out one goes. The current disclosure allows for the use of fluoropolymer in the lining sleeve. The benefits of fluoropolymer have been unavailable in high speed centrifugal pumps because the forces are too great on the periphery of the seal casing. However, the lower speeds along the interior, near the shaft, allow fluoropolymer to be used.

A measurement system and a measurement method for measuring a surface of a rotor blade of a wind power installation as a measured object. The measurement system comprises: a carrier unit having a plurality of measurement sensors arranged in a measurement plane, wherein the measurement system is configured to align the measurement plane with a profile section of the measured object, a movement unit which is configured to move the carrier unit relative to the measured object in a longitudinal direction that is at an angle to the measurement plane, and an advancing unit which is configured to advance at least one measurement sensor in the measurement plane relative to the profile section. The measurement system and the measurement method facilitate an accurate measurement of the surface of the measured object with reduced outlay.

An assembly of a first element with a second element includes an elongate thin lip belonging to the second element being inserted in an elongate narrow slot formed by three sides of an elongate flat plate fixed in parallel to a flat wall of the first element. At least one element forming a guide is secured to a long side of the elongate flat plate forming an edge of the slot. The element forming a guide includes a sliding surface extending in the continuation of the elongate flat plate and diverging from the flat wall away from the first element. The at least one element forming a guide cooperates with the lip so that the insertion of the lip into the slot begins with the sliding of the lip on the sliding surface and then continues as the lip advances, with progressive insertion of the lip into the slot.

A centrifugal fan includes an impeller, a motor and a fan frame. The motor is connected with the impeller and configured to drive the impeller. The fan frame includes a base plate, a top plate, a sidewall and air deflectors. The impeller is disposed between the base plate and the top plate. The sidewall is disposed on the base plate between the base plate and the top plate. A flow channel is between the impeller and the sidewall. The air deflectors are directly connected to the base plate and the top plate, and disposed toward an air outlet and sequentially at different radial positions outwardly from the sidewall along a forward circumferential direction toward an air outlet with respect to the impeller to sequentially expand the flow channel outwardly in a radial direction at different circumferential positions along the forward circumferential direction with respect to the impeller. The airflow entry tunnels are formed by the air deflectors between the base plate and the top plate.

The present invention relates to a hydroelectric power generator using ebb and flow of seawater. More particularly, the hydroelectric power generator is able to continuously generate power through high tide and low tide created according to a tidal difference that continuously occurs, while being submerged in seawater, using a marine current that flows fast. The hydroelectric power generator is also able to utilize eco-friendly energy that does not require a reservoir by adjusting the amount of inflow of seawater and to be installed at various places, while being varied in size, as necessary.

A diffuser, an airflow generating apparatus, and an electrical device are provided. The airflow generating apparatus includes a motor; an impeller including blades with air passages formed therebetween; and a diffuser including diffusing vanes with diffusing channels formed therebetween. In a flow region defined between a terminating end of one diffusing vane and a starting end of another adjacent diffusing vane, an intersection line between a bottom of the diffusing channel between the two diffusing vanes and its circumferential section includes a front arcuate line segment and a subsequent straight line segment, the arcuate line segment extends curvedly, outwardly and downwardly from or from adjacent an inlet end of the diffusing channel, the straight line segment connects to the arcuate line segment and extends to an outlet end of the diffusing channel. The diffusing channel is designed to improve the operating efficiency of the airflow generating apparatus.

A fluid machine includes a main body, two first screw rotors, two second screw rotors, a driving module, a first slide member and a second slide member. The two first screw rotors are meshingly engaged with each other. The two second screw rotors are meshingly engaged with each other. Two first screw rotors are arranged in the first chamber of the main body. Two second screw rotors are arranged in the second chamber of the main body. The driving module is arranged in the drive chamber of the main body. The first slide member can move relative to the two first screw rotors. The second slide member can move relative to the two second screw rotors. A fluid entering the main body exits after being compressed or expanded by the two first screw rotors and the two second screw rotors.

Compressor stage with a stator-side intake connection piece via which medium which is to be compressed can be introduced into the compressor stage in the region of the compressor stage, with a stator-side inflow channel via which the medium to be compressed can be conveyed in direction of a rotor-side impeller proceeding from the intake connection piece, wherein the impeller has a radially inner hub, a radially outer cover disk and impeller blades extending between the hub and the cover disk, wherein a plus measuring point and a minus measuring point are provided at the compressor stage for measuring the effective pressure at the compressor stage, and wherein the minus measuring point is positioned upstream of the impeller outside of the stator-side inflow channel in an annular gap which branches off from the inflow channel.

A fan frame body with damping structure and a fan thereof. The fan frame body includes a fan frame main body having a first opening, a second opening, a flow way and a base section. The first and second openings are respectively positioned at the upper and lower ends of the fan frame main body. The flow way is disposed between the first and second openings in communication with the first and second openings. The base section is disposed at the second opening. A bearing cup and multiple static blades are perpendicularly disposed on the base section. Two ends of the static blades are respectively connected with the base section and the fan frame main body. Multiple damping structures are annularly disposed on an inner wall of the fan frame main body. The damping structures are raised body structures or recess structures.