Abstract:
A device is provided for multiplying the pulse frequency of a pulse train signal. The device includes input means for the signal and means for accessing the signal at points with a predetermined phase difference between them. The device additionally comprises means at a first level for combining accessed signal pairs, with one and the same phase distance within all the combined pairs, the output from each first level combining means being a pulse train. The device additionally comprises combining means at a second level for combining the pulse trains from the first level, and the combining means at the first level are such that the pulses in their output pulse trains have rise flanks which always coincide with the rise flank of the first signal in the combined accessed signal pairs, and fall flanks which always coincide with the fall flanks of the second signal in said pair.
Abstract:
The present invention relates to a tunable microwave arrangement (10) comprising a microwave/integrated circuit device (11) and a substrate (6). It comprises a layered structure disposed between said microwave/integrated circuit device and said substrate (5), said layered structure acting as a ground plane and it comprises at least one regularly or irregularly patterned first metal layer (1), at least one second metal layer (3), at least one tunable ferroelectric film layer (2), whereby said layers are so arranged that the ferroelectric film layers) (2) is/are provided between the/a first metal layer (1) and the/a second metal layer (3).
Abstract:
The invention discloses a delay-locked loop circuit with input means for a signal that is to be delayed, the input means comprising means for splitting the input signal into a first and a second branch. The signal in the first branch is connected to a component for delaying the signal, and the signal in the second branch is used as a non-delayed reference for the delay caused by the delay component in the first branch. The delay component is a passive tunable delay line, and the circuit comprises tuning means for the tunable delay line, the tuning means being affected by said reference signal, and the first branch comprises output means for outputting a delayed signal with a chosen phase delay. Suitably, the delay component is continuously tunable, for example a tunable ferroelectric delay line.
Abstract:
A gas burner in which a burner head is positioned within an inner pipe that is surrounded by an outer protective pipe. Fuel is delivered to the burner head through a fuel conduit positioned within the inner pipe, and combustion air is delivered through the inner pipe. The fuel conduit terminates short of the burner head and the wall of that conduit is provided with a plurality of holes. A further pipe surrounds at least the perforated part of the fuel conduit, and one end of the further pipe extends to the the burner head while the other end is sealed against the fuel conduit to form a mixing chamber between the outside of the fuel conduit and the inside of the further pipe. A second conduit is provided to conduct a given amount of air to the mixing chamber.
Abstract:
Insert for electrical furnaces comprising an insulating shell and a coiled heater element, the heater element comprising element wire that consists of at least two sections that are interconnected via a bend of element wire in such a way that the bend and the sections mutually form a loop of element wire. A fastening member is fixedly anchored in the insulating shell and arranged in the area of the bend in such a way that the element wire in a section directly connected to the bend is prevented from expanding past the fastening member.
Abstract:
Electric heating device with a radiant tube and an electrical heating element arranged in the radiant tube as well as a protective insert of electrically conductive material. The protective insert is arranged between the radiant tube and the electrical heating element. The device allows the use of higher element power.
Abstract:
A method of and an arrangement for transmitting electric current to a furnace that is heated, either completely or partially, by electric current conducted in the furnace wall. The current is conducted through electrically conductive devices connected to the furnace wall. At least one of the devices in proximity to the furnace wall includes a section that has a smaller cross-sectional area than the remainder of the device. The current flow through the smaller cross-section develops heat in the region of the smaller section of a magnitude that corresponds substantially to the heat magnitude that would have been conducted from the furnace wall to the electrically conductive device in the absence of the smaller cross-sectional area.
Abstract:
A roller for a roller hearth furnace comprising a dispersion strengthened steel is disclosed. The roller does not require any coating or reconditioning.
Abstract:
An electrical heating element for vertical installation, includes vertically suspended electrical resistance elements for heating furnaces in industrial operation, each element having conductive legs, where along the length of the element there are placed ceramic disks provided with holes, through which holes the relevant legs of the element pass, where the ceramic disks are arranged between ceramic tubes and where an upper metallic central rod is positioned within the ceramic tubes, which central rod supports the element and where the element is surrounded by a radiative tube. There are a number of upper ceramic tubes outside of the upper central rod, with intermediate ceramic disks. The central rod extends a certain distance down into the radiative tube. A number of lower ceramic tubes with intermediate ceramic disks are positioned outside of a lower central rod.
Abstract:
A method of cooling strip or wire products in which, subsequent to being annealed, the product is cooled to a temperature of about 20-50° C. below its oxidation temperature. The product is wound around a drum immediately downstream of an annealing path so that the product lies in mutually juxtaposed turns on the drum. It is thereafter unwound from the drum after a number of turns. The number of turns is such that the product is cooled to a desired temperature. The drum has a diameter that exceeds the diameter at which the product will be influenced mechanically by plastic deformation.