878 results about "Spark gap" patented technology

A surge protection element for a conventional cable connector includes a printed circuit board preferably shaped as two concentric rings connected by two spokes. The outer ring is electrically connected to the grounded portion of the cable connector body. A printed circuit trace on one of the spokes is separated from a printed circuit trace on the inner ring by a spark gap. If a high voltage surge is carried by the coaxial cable transmission line, a spark is formed in the gap. As a consequence, the high voltage surge is transferred to the surge protection element which in turn conducts the electricity to the grounded body of the connector.

A pre-chamber spark plug that includes a shell. Additionally, the pre-chamber spark plug includes an insulator disposed within the shell. In a particular embodiment, a center electrode has a first portion surrounded by the insulator, and a second portion that extends from the insulator into a pre-chamber. The pre-chamber defined by the shell. In a further embodiment, a ground electrode is attached to the insulator. In particular embodiments, the ground electrode is tubular in shape and includes an inner spark surface ring spaced in surrounding relation to the center electrode to create a spark gap, an outer ring attached to the shell, and a plurality of rounded spokes connecting the inner and outer rings. In a particular embodiment, the ground and center electrodes accommodate attachment of precious metal alloys to increase electrode surface life. In another embodiment the ground electrode and insulator is coaxial to the center electrode.

A method and apparatus to maximize spark plug life in pre-chamber spark plugs operating with ultra-lean mixtures and/or elevated engine BMEP is presented. Electrode erosion is reduced by spreading discharge energy over a wider surface area, maintaining fuel concentration in the spark gap, controlling gas static pressure during discharge, and maintaining safe electrode temperature. Energy is spread via a swirling effect created by periphery holes in an end cap, resulting in a lower specific energy discharge at the electrodes. Divergently configured electrodes reduce the spark voltage at high operating pressures and the energy required for ignition. The flow field generated at the electrodes prevents electrical shorts due to water condensation and avoids misfire. The center electrode insulation provides an effective heat transfer path to prevent electrode overheating and pre-ignition. The volume behind the electrodes provides a volume for burnt products from previous combustion cycles and leads to more reliable ignition.

A device, system and method for the generation of therapeutic acoustic shock waves for at least partially separating a deposit from a vascular structure. The shock waves may optionally be generated according to any mechanism which is known in the art, including but not limited to, spark gap technology, electromagnetic shock wave generation and piezoelectric technology for generating therapeutic pressure pulses. Examples of deposits which may be treated with the present invention include, but are not limited to, atherosclerotic plaques, any type of clot, and any type of thrombus or embolus. The vascular structure itself may be any such structure for conducting blood flow, including but not limited to arteries, veins and the aortic arch.

A prechamber spark plug may have a prechamber having a pre-determined aspect ratio and hole pattern to achieve particular combustion performance characteristics. The aspect ratio and hole pattern may induce a rotational flow of fuel-air in-filling streams inside the prechamber volume. The rotational flow of the fuel-air mixture may include both radial flow and axial flow characteristics based on the aspect ratio and hole pattern. Axial flow characteristics can include a first axial direction proximate the periphery of the rotational flow and a counter second axial direction approaching the center of the rotational flow. The radial and axial flow characteristics may further include radial air-fuel ratio stratification and/or axial air-fuel ratio stratification. The rotational flow, the radial flow and the axial flow may be adjusted by alteration of the aspect ratio and hole pattern to achieve particular combustion performance characteristics in relation to a wide variety of spark gap geometries.

A fuel injector having an integrated ignition device includes a first electrode pair for igniting fuel which is injected directly into a combustion chamber of an internal combustion chamber through spray-discharge orifices of the fuel injector. The first electrode pair is made up of a ground electrode and a center electrode which are set apart by a spark gap. The fuel injector and the ignition device are situated in a shared housing. The ignition device has at least one additional spark gap and/or an additional electrode pair.

A fuel delivery injector for an internal combustion engine. The fuel injector forms pan of a device (10) which provides a combined injection and ignition means for the engine. The fuel delivery injector comprises a first portion (31) and a second portion (32) adapted to be detachably connected together. The first portion has a delivery port (37) defined between a valve seat (61) and a valve member (63) movable with respect to the valve seat (61) for opening and closing the delivery port (37). An actuating member (87) is provided in the first portion (31) and is operatively connected to the valve member (63). An actuating means (85) is provided in the second portion (32). When the first and second portions (31, 32) are connected together, the actuating mean (85) is operably associated with the actuating member (87) to provide an actuating assembly (83). Typically, the actuating assembly (83) comprises an electromagnetic means in which the actuating member (87) comprises a solenoid armature and the actuating means (85) comprises a solenoid oil, whereby connection of the first and second portions (31, 32) together completes assembly of the electromagnetic means. Where the device (10) provides a combined fuel injector and ignition me the device (10) is provided with a primary electrode (58) which cooperates with a secondary electrode (57) to define a spark gap (60). A popper projection (62) provided on the valve member (63) is utilized to define the primary electrode (58), as well as to provide spray guidance effects on the fuel spray issuing from the delivery port (37). The device (10) providing the combined fuel injection and ignition means is also described and claimed.

An electrode for an ignition device is made from a Ni-based nickel-chromium-iron alloy which has improved resistance to high temperature oxidation, sulfidation, corrosive wear, deformation and fracture includes, by weight of the alloy: 14.5-25% chromium; 7-22% iron; 0.2-0.5% manganese; 0.2-0.5% silicon; 0.1-2.5% aluminum; 0.05-0.15% titanium; 0.01-0.1% total of calcium and magnesium; 0.005-0.5% zirconium; 0.001-0.01% boron, and the balance substantially Ni. It may also include at least one rare earth element selected from the group consisting of: yttrium, hafnium, lanthanum, cerium and neodymium in amounts ranging from 0.01-0.15% by weight, and incidental impurities, including cobalt, niobium, molybdenum, copper, carbon, lead, phosphorus or sulfur. These total of these impurities will typically be controlled to limits of 0.1% cobalt, 0.05% niobium, 0.05% molybdenum, 0.01% copper, 0.01% carbon, 0.005% lead, 0.005% phosphorus and 0.005% sulfur. The ignition device may be a spark plug which includes a ceramic insulator, a conductive shell, a center electrode disposed in the ceramic insulator having a terminal end and a sparking end with a center electrode sparking surface, and a ground electrode operatively attached to said shell having a ground electrode sparking surface, the center electrode sparking surface and the ground electrode sparking surface defining a spark gap therebetween. At least one of the center electrode or the ground electrode includes the solution-strengthened Ni-based nickel-chromium-iron alloy. The Ni-based nickel-chromium-iron alloy electrodes of the invention may also include a core with thermal conductivity greater than that of the Ni-based nickel-chromium-iron alloy, such as copper or silver or their alloys.

A pre-chamber spark plug that includes a shell, and an end cap attached to the shell. Additionally, the pre-chamber spark plug includes an insulator disposed within the shell. In a particular embodiment, a center electrode has a first portion surrounded by the insulator, and a second portion that extends from the insulator into a pre-chamber. The pre-chamber defined by the shell and end cap. In a further embodiment, a ground electrode is attached to the shell. In particular embodiments, the ground electrode is tubular in shape and includes an inner spark surface ring spaced in surrounding relation to the center electrode to create a spark gap, an outer ring attached to the shell, and a plurality of rounded spokes connecting the inner and outer rings. In a particular embodiment, the ground and center electrodes accommodate attachment of precious metal alloys to increase electrode surface life.

A surge protection circuit may include a tuned circuit board with traces designed to provide a surge protected and RF isolated DC path while propagating RF signals through the PCB dielectric with microstrip lines. The surge protection circuit utilizes high impedance RF decoupling devices such as quarterwave traces or inductors which isolate the multistage DC protection scheme which may include a gas discharge tube, serial surge impeding devices such as inductors and/or resistors, a decoupled air/spark gap device and a Zener diode junction.

Disclosed herein shock wave catheters comprising one or more shock wave electrodes for cracking calcifications located within blood vessels. In some variations, a shock wave catheter has first and second shock wave electrodes each circumferentially disposed over the outer surface of the catheter. In certain variations, the first electrode has a recess and the second electrode has a protrusion that is received by the recess and a spark gap is located along the separation between the recess and the protrusion. The second electrode can also have a recess that receives a protrusion from a third shock wave electrode, where the separation between the second and third electrodes along the separation between the recess and the protrusion forms a second spark gap. A shock wave can be initiated across these spark gaps when a voltage is applied over the electrodes.

The invention discloses a multichannel gas spark switch applying a plasma synthesis jet trigger technology. The multichannel gas spark switch is characterized in that the spark gap of an air switch is divided by a middle trigger electrode into two equal parts; the trigger electrode is composed of three portions, i.e., an upper electrode disc, a lower electrode disc and an insulation ring; more than one excitation cavities and jet orifices are embedded into the insulation ring for generating at one side of the trigger electrode multichannel plasma injection; and the surface of an electrode portion at the other side is provided with an annular metal protrusion for forming multichannel discharge in the relative spark gap. A switch housing is made of organic glass or other insulation materials, so that when a trigger pulse reaches the trigger electrode, a higher field distortion coefficient is formed at the side of the annular electrode portion, and at the same time the multichannel plasma injection is formed at the other side, thus the spark inductance of the air switch is reduced, the electrode ablation is minimized, and the service life of the switch is prolonged.

A time-of-flight flow meter that is particularly useful for measuring the flow of gases, such as steam, uses a spark gap periodically energized with an electrical pulse to generate an acoustic pulse. The pulse is detected by upstream and downstream acoustic detectors that may be capacitive transducers having flexible plates wetted on both sides by the fluid so that no external venting is required. The acoustic detectors may be electrically heated to avoid condensation effects. In some cases the interior of the pipe or other conduit is shaped near the source so as to define acoustic beams aimed at the detectors and so as to concentrate the received acoustic energy on the detectors.

A method is disclosed for expanding the mid load operation limit in a four-stroke gasoline direct-injection controlled auto-ignition combustion engine. A system is employed for variably actuating the intake and exhaust valves and for operating the valves with an exhaust re-compression or exhaust re-breathing valve strategy. A spark plug is provided. A fuel injector having multiple injection capability is employed. A first fuel charge is injected into the combustion chamber to form a lean air-fuel mixture. A second fuel charge is injected into the combustion chamber to form a stratified air-fuel mixture having an ignitable mixture located near the spark plug. The ignitable mixture is ignited at the spark gap, thereby causing spark-ignition combustion that causes a sufficient increase in chamber pressure and temperature to trigger auto-ignition of the lean air-fuel mixture, resulting in the obtaining of a higher engine load before a pressure rise rate in the combustion chamber exceeds a prescribed threshold value.

A wind turbine rotor including a rotor hub (3) and a plurality of blades (4), and where each blade root (16) is connected to said rotor hub through a pitch bearing (5) in such a manner that the pitch angle of the blade is adjustable by a turning of the blade about its longitudinal axis relative to the rotor hub. The blade is provided with at least one electrically conducting lightening down-conductor (6) extending in the longitudinal direction of the blade to the blade root and being electrically isolated from the pitch bearing (5). A spark gap (15) is provided between the lightning down-conductor and the rotor hub, said spark gap (15) being adapted to conduct a lightning current passing through the lightning down-conductor. A sliding contact connection (7, 12) is provided parallel to the spark gap (15) between the lightning down-conductor (6) and the rotor hub (3), said sliding contact connection ensuring electrical contact between said lightening down-conductor (6) and said rotor hub (3) irrespective of the pitch angle of the blade. The invention also relates to a wind turbine including such a rotor.

A spark plug, a center electrode therefore and method of construction is provided. The spark plug has a generally annular ceramic insulator extending between a terminal end and a nose end. A conductive shell surrounds at least a portion of the ceramic insulator and a ground electrode having a ground electrode sparking surface is operatively attached to the shell. An elongate center electrode has a body extending between opposite ends, wherein the body is compacted and sintered of a conductive or semi-conductive ceramic material. One of the electrode ends provides a center electrode sparking surface to provide a spark gap between the center electrode sparking surface and the ground electrode sparking surface.

A spark plug for a spark-ignited internal combustion engine includes a generally tubular ceramic insulator. A conductive shell surrounds at least a portion of the ceramic insulator and includes at least one ground electrode. A center electrode is disposed in the ceramic insulator. The center electrode has an upper terminal end and a lower sparking end in opposing relation to the ground electrode, with a spark gap defining the space therebetween. The ground electrode extends from an anchored end adjacent the shell to a distal end adjacent the spark gap. The ground electrode includes a ledge formed on its distal end having at least one inset planar surface and an inset back wall. A high-performance metallic sparking tip is attached to the distal end of the ground electrode. The sparking tip has a base end disposed in surface-to-surface contact with the inset planar surface of the ledge. A particular advantage of the invention is achieved by the inset planar surface completely covering the base end of the sparking tip and extending outwardly therefrom to provide an exposed peripheral interface whereby optional attachment methods, such as welds may be applied, if desired, about at least a portion of the exposed periphery of the base end. In addition, portions of the sparking tip may abut the inset back wall, upper surface of center electrode or both enabling attachment of the sparking tip to the points where it abuts these surfaces.