789results about How to "Reduce air leakage" patented technology

This invention relates generally to a design of lung devices for safely performing a transthoracic procedure. In particular, the invention provides devices and methods of using these devices to access the thoracic cavity with minimal risk of causing pneumothorax or hemothorax. More specifically, the invention enables diagnostic and therapeutic access to a thoracic cavity using large bore instruments. This invention also provides a method for diagnostic and therapeutic procedures using a device capable of sealing the wound upon withdrawal of the device. The invention includes a device comprising an elongated body adapted to make contact with a tissue of a subject through an access hole, and a sealant delivery element. The invention also includes a method of performing tissue treatment or diagnosis in a subject.

A device for treating a patient suffering from obstructive sleep apnea or snoring can include an expiratory valve connected to a manifold. The expiratory valve can include a body portion including a feedback port configured to be connected to an air flow generator. The expiratory valve can include a plunger at least partially disposed in the body portion. The expiratory valve can include a pressurizing chamber positioned between an end of the plunger and an end of the expiratory valve. The pressurizing chamber can be configured to receive air from the air flow generator through the feedback port.

The invention discloses a system and a method for using sintering waste heat to generate electricity and belongs to the technical field of sintering waste heat electricity generation of the steel works. The system comprises a sintering machine, a hot gas outlet pipe, a gas waste heat boiler, a main exhaust fan, a ring cooling machine, a first and second stage heat waste gas collecting pipe, a waste gas heat boiler, a draught fan, a circulating fan, a chimney, a low pressure steam drum, a middle pressure steam drum, a feed pump, a pressure reducing valve, a collecting header, a steam turbine, a generator, a condenser and a condensate pump. The invention realizes utilizing the waste heat of the non-desulfurization flue header of the sintering machine without arranging an inducing fan by reasonably designing the hot gas connecting mode of the air box at the tail part of the sintering machine and the gas resistance of the waste gas heat boiler. First and second stage sealing covers of the ring cooling machine are uniformly provided with a plurality of waste gas branch pipes so as to realize uniform distribution of the waste gas pressure in the sealing covers and reduce air leakage. Part of waste gas is adopted to circulate to improve the temperature of the waste gas. Compared with the existing system for using sintering waste heat to generate electricity, the system of the invention sufficiently uses the waste heat of the sintering system, improves the waste heat generated energy and reduces the operation cost.

There is described an improved multi-piece anchor body for use with masonry over stud back-up walls, the anchor body made up of an inner anchor body for connection to a back-up wall, a separate outer anchor body for connection to a masonry wall, and a separate intermediate membrane flange attachable to and between the outer anchor body and the inner anchor body.

The invention relates to a hydraulic fracturing control method of cut tight roof/top coal. The method comprises the following steps: constructing two rows of fracturing drill holes at intervals in the roof/top coal above an open-off cut by a drilling machine to a set depth, wherein one row of fracturing drill holes is close to a main upper of the open-off cut while the other row is close to an auxiliary upper of the open-off cut; constructing a row of anchor cable drill holes to the roof/top coal at the left and right ends of the open-off cut, respectively; or constructing rows of fracturing drill holes in different directions in a measure lane of the roof above the open-off cut; carrying out hydraulic fracturing on the drill holes, so that one or more cracks are generated on a rock body in a given plane to split the rock stratum to blocks or layers in certain shapes and sizes so as to damage the integrity of the rock and reduce the strength of the rock. Therefore, pressure of the roof in a large area and sudden extrusion of accumulated gases in a worked out section in an early mining stage on a coal face are prevented, air leak on the coal face is reduced, and the safety is ensured. Meanwhile, caving of top coal can be improved. The method is simple, convenient to construct, safe and reliable and good in effect.

An improved turbine spring clip seal for directing gases to be mixed with fuel in a combustor basket. The turbine clip seal may include an inner housing and an outer housing. The inner housing or the outer housing, or both, may include one or more tapered leaves forming a portion of the spring clip seal. At least one leaf may include a flared end for limiting gas from passing through the slots in the spring clip seal. In at least one embodiment, the turbine clip seal may include a center sealing member positioned between the inner and outer housings.

A system for treating a patient suffering from obstructive sleep apnea may include a mask, a portable air flow generator configured to generate air flow at a relatively low flow rate, and a tube connecting the air flow generator and the mask such that air flow from the generator passes through an air flow generator valve on the mask. The mask may include a contact surface for forming a seal between the mask and the patient's face such that the mask surrounds the patient's nostrils, an expiration valve that opens during expiration, and an air flow generator valve that opens during inspiration. In some embodiments, the mask may further include an inspiration valve that opens during inspiration to allow air from outside the system to enter the mask.

A blade for a rotor assembly including a root portion, a platform with an overhang, an airfoil portion and a sealing plate. The sealing plate protrudes from the blade along a circumferential direction.

A vacuum sealing method and system for evacuating air from and sealing a flexible plastic bag of the type having a mating male rib and a female sealing channel closure along the length of the bag opening. A flowable liquid is applied to the female channel. The rib and channel are engaged along their length to leave a short portion of the closure unclosed, a hollow tubular evacuation tube connected with a vacuum pump is inserted into the bag through the unclosed portion, pinching pressure is manually applied to sandwich the evacuation tube between the unclosed portion to prevent air from escaping, the vacuum pump is operated to withdraw a substantial amount of air from the bag, and thereafter the evacuation tube is quickly pulled from the bag so that the pinching pressure is transferred to the closure thereby closing the unclosed portion and sealing the evacuated bag with the liquid filling voids between the mating elements and providing a supplemental seal to increase resistance to air entering the sealed bag.

The present invention includes a grommet and valve stem assembly. The assembly includes a grommet having a body, a nose section at a grommet first end, a cylindrical section having a first end adjoined to the nose section and a second end from which a flange section projects radially. The flange section has a substantially flat surface opposite to the cylindrical section. At least one interface seal is formed on the flat surface as a hemispherical projection located concentrically about a grommet center axis. An axial bore passes centrally through the body, and a valve stem is configured for insertion through the grommet bore. The valve stem includes a threaded portion configured to receive a retaining nut and a flange having a substantially flat surface configured to form at least one sealing interface with the at least one interface seal when the nut is tightened to the valve stem.

The invention relates to the field of reclaiming of waste gas and waste heat in the steel industry and power generation by the waste gas and the waste heat, in particular to a control method and a device for stabilizing and improving air taking temperature of a sintered ring in steel smelting. The device and the method are characterized in that the device and the technical method can achieve relative stabilization and moderate improvement of the temperature of the waste gas at the upper part of an inner batch layer of a cooling trolley through increasing and adjusting speed and cooled air of a circular cooler and uniformity for transversely feeding at a feed opening; and at the same time, under the premise that the temperature of the waste gas reaches the technical requirement of a waste heat generating technique, flow of the waste gas at the upper part of the batch layer is increased by properly increasing blown air amount at the lower part of the cooling trolley, so as to ensure relative stabilization and moderate improvement of air inlet temperature and flow of a waste heat boiler, and promote stabilization and improvement of vapor yield of the waste heat boiler and generated energy of a generating system.

The invention discloses an off-road vehicle wheel free of inflation. The off-road vehicle wheel free of inflation is composed of a flexible rim, elastic spokes and a rigid hub. The off-road vehicle wheel free of inflation is normally installed on an off-road vehicle. When the off-road vehicle runs, the off-road vehicle wheel free of inflation bears the action of a complicated road surface, and the flexible rim and the elastic spokes generate elastic deformation under the action of external force. When the external force is eliminated, the flexible rim and the elastic spokes recover. In this way, the external force is effectively buffered, shock of the vehicle is reduced, and the bearing capacity of the vehicle is improved. Through a polyurethane interlayer of a hexagonal structure similar to a honeycomb, the firmness of the wheel is improved, a load is evenly distributed, and therefore the environmental adaptability and the safety are improved. A rubber layer is provided with rubber wheel thorns, and therefore the traction performance and the adhesion performance of the vehicle are improved. The off-road vehicle wheel free of inflation is simple in structure, convenient to replace, high in applicability and suitable for various complicated road surfaces, air leakage and burst are avoided, the shock of the vehicle can be effectively reduced, the bearing capacity and the buffering capacity of a vehicle body are improved, the environment adaptability and the safety are improved, and the traction performance and the adhesion performance of the vehicle are improved.

The invention discloses a differential motion airtight feeding electric furnace smelting device and a feeding method thereof. The device comprises an electric furnace and a charging device, wherein the charging device comprises a cold receiving conveying trough and a heat conveying trough; the lower sides of the cold receiving conveying trough and the heat conveying trough are provided with an independently-controlled excitation device respectively; the outlet of the cold receiving conveying trough is provided with a conveying throat opening which is extended into the heat conveying trough; and the distance between the conveying throat opening and the bottom of the heat conveying trough is greater than or equal to the depth of the heat conveying trough. By the feeding method, shock excitation at different frequencies is applied to the two conveying troughs to realize the differential motion conveying of raw materials, so that a thicker material layer can be laid on the cold receiving conveying trough, and the material loading speed is increased; simultaneously, a shorter cold receiving conveying trough and a shorter material-conveying bottom elongated slot can be designed, so that the device and the method make project implementation convenient. In addition, due to the adoption of the throat opening and a sealed door structure, the possibility of material blocking and the air leakage rate are greatly reduced, and the device has low heat loss and a good dedusting effect, and is high-efficient, energy-saving and environment-friendly during smelting.