3301 results about "Pressure pipe" patented technology

The invention provides a variety of surgical instruments for forming a liquid jet, which are useful for performing a wide variety of surgical procedures. In some embodiments, the invention provides surgical liquid jet instruments having a pressure tube and an evacuation tube, where the pressure tube includes at least one nozzle for forming a liquid jet and where the evacuation tube includes a jet-receiving opening for receiving the liquid jet when the instrument is in operation. In some embodiments, the distal ends of both the pressure and evacuation tubes have a first configuration in a non-relaxed state and a second configuration in a more relaxed state. In some embodiments, a straightener is constructed to selectively control the configuration of the distal ends of both the pressure and evacuation tubes. The invention also provides surgical methods utilizing the inventive surgical liquid jet instruments for cutting or ablating a selected tissue within portions of a patient's spine, such as within the intervertebral disc.

A portable unmanned air vehicle and launcher system is provided that includes a foldable unmanned air vehicle having a pressure tube; a launch gas reservoir for holding launch gas; a launch tube operatively connected to the launch gas reservoir and having a free end that is positioned in the pressure tube of the air vehicle; a free piston positioned within the launch tube; and a free piston stop to prevent the free piston from leaving the launch tube. A first portion of the launch gas in the launch gas reservoir is released into the launch tube and forces the free piston from an initial position to an end position at which the free piston is stopped by the free piston stop.

Certain embodiments of the invention provide a variety of methods of manufacturing a liquid jet-forming surgical instrument. According to these methods, a nozzle assembly of the instrument is electroformed on a mandrel. The nozzle assembly includes a nozzle providing a jet-opening, wherein the nozzle is shaped to form a liquid jet. In some embodiments, the mandrel includes a first mandrel portion and a second mandrel portion. Once the nozzle assembly is formed, the mandrel may be removed from the nozzle assembly. The nozzle assembly may in certain embodiments be coupled to an outlet of the pressure tube. In certain embodiments, an inlet of an evacuation tube is positioned such that a jet-receiving opening of the evacuation tube is positioned opposite the jet-opening of the nozzle.

The invention discloses an indoor grouting testing device under simulation of a complex stress effect and a testing method thereof. According to the invention, a rock-soil sample is wrapped with a rubber membrane, and is provided with an upper permeable stone and a lower permeable stone on the upper surface and the lower surface thereof respectively; the upper permeable stone and the lower permeable stone are arranged in a closed surrounding pressure room; the upper permeable stone is provided with a pressurization plug; the pressurization plug is connected to an axial pressurization device through a force transfer rod; a surrounding pressure pipe is communicated with the surrounding pressure room, and the outer end of the surrounding pressure pipe is connected with a surrounding pressure system; a counter pressure pipe is connected with the upper permeable stone, and the outer end of the counter pressure pipe is connected with a counter pressure system; and a grouting filter pipe, placed in the axes of the rock-soil sample, is connected with equipment, such as a grouting pump, a slurry barrel and the like through grouting pipes. Through truly simulating the coupling effect between deep complex stress and underground water pressure, the slurry dispersion radius in rock-soil body grouting and the function relationship between the osmotic coefficient value of a grouted stone body and the related parameter are obtained. The device and the method shorten the time needed by tests, and achieve effects of convenience, reliability and accuracy.

The invention provides a tester for the bearing and plugging strength of a mud cake under high temperature and high pressure, which can simulate the static conditions in a well and test the invasion depth of slurry filter liquid, bearing strength of mud cake, plugging and bearing strength against cracks in drilling for oil (gas) wells. The tester essentially comprises a mud-cake performance evaluation and test vessel assembly, a pressure pipe system, a temperature control system, a displacement record system, an automatic cleaning system and a computer data processing system. The tester allows all-sided simulation of the temperature, pressure and stratum features (seepage) under a well, determination the plugging and bearing strength of mud cakes, optimization of drilling fluid, rapid and safe drilling, therefore the tester is of a very wide application prospect.

A configuration for a cryo-catheter which optimizes both the catheter's outer diameter and the size of the catheter's internal refrigerant flow path is described. Specifically, the inner dimensions of the cryo-catheter are configured to accommodate a pre-selected flow of refrigerant into the catheter's distal tip, and a return flow of refrigerant from the distal tip. The return flow is established in the void spaces between a refrigerant supply line and the inner wall of the catheter body. The available void space varies along the catheter length and depends on the presence/absence of various catheter accessories (i.e. pull wires, pressure tubes, etc.) which typically only extend through a portion of the catheter length. The disclosed configuration ensures that the cryo-catheter does not operate in a refrigerant limited condition, maintains the refrigerant as a liquid in the supply tube, and maintains the return line pressure at about 1 atmosphere.

A non-lethal cargo projectile comprises a projectile body; a fuze adapter attached to a front of the projectile body; a fuze attached to the fuze adapter; a boattail attached to a rear of the projectile body; a pressure tube extending from the fuze adapter to the boattail; a decelerator and drogue chute disposed aft of the fuze adapter; a flexible line that connects the pressure tube to the decelerator; a center disc disposed aft of the decelerator and drogue chute; a rear disc disposed aft of the center disc, the center disc and the rear disc defining a payload volume therebetween; a second flexible line that connects the rear disc to the boattail; at least one shearable fastener that fastens the projectile body to the fuze adapter; and at least one vent extending from the boattail to the fuze adapter.

The invention relates to a polyvinyl chloride pressure tube with high impact resistance. The pressure tube comprises 100 portions of PVC resin, 1.5 to 4.0 portions of thermal stabilizing agent, 0.4 to 1.2 portions of lubricant, 6 to 12 portions of impact modifier, 0 to 5 portions of filler and 2 to 3 portions of colorant according to weight unit. Compared with a common PVC-U tube material, the polyvinyl chloride pressure tube keeps high strength of the PVC-U tube material and greatly improves toughness and impact resistance of the tube material.

The present invention is an improved vibratory pumping mechanism that increases the efficiency of utilization of the vibratory motion within a mechanism. More specifically, the mechanism includes a central chamber within which a piston is oscillated to draw fluid into the chamber and expel fluid from within the chamber outwardly through a nozzle connected to the chamber. The chamber includes a pressure tube connected to a rearward end of the chamber and to a secondary chamber positioned around and in fluid communication with the chamber. The pressure tube allows the negative pressure generated by the motion of the piston in either direction to be utilized in preventing any fluid from being directed out of the mechanism in a direction other than through the nozzle, thereby increasing the efficiency of the pump.

The invention belongs to the technical field of pile foundation quality detection in civil engineering, in particular to a method for measuring pile shaft internal force and cross section displacementin vertical dead-load test of a foundation pile. In the method, firstly, a casing is embedded on a pile shaft lengthways or holes are directly drilled on the pile shaft lengthways; a measuring systemis arranged in the casing or the drilling hole and is composed of an anchor head, a multiple position extensometer, an extension bar and a pressure pipe, wherein, the pressure pipe pressurizes to expand the anchor head so as to ensure that the anchor head is fixed in the casing or the drilling hole; after the anchor head is fixed, the multiple position extensometer measures vertical deformation between two adjacent anchor heads by the extension bar; according to a vertical displacement observation result and vertical deformation between two adjacent anchor heads, the layering frictional resistance of each soil layer, pile end supporting force and the vertical displacement of anchor head embedding cross section are calculated, and the relation of pile soil relative displacement and pile side frictional resistance is built so as to realize pile shaft internal force and cross section vertical displacement measurement. The invention has high test accuracy and favorable reliability, can replace traditional method using strain or string-wire sensors and displacement rods to measure pile shaft internal force and cross section vertical displacement.

The present invention has incorporated a re-boosting pump to re-boost and to supply additional pressure energy input to a system periodically. The re-boosting pump gets its energy from a starting/re-boosting generator. This works to keep the level of the energy output sustainable.

Another feature of the present invention is that it has incorporated a convergence recoil nozzle that utilizes a recoil force of the water jet. This recoil force which is equal in magnitude and opposite in direction, will push a piston that is inside a pressure chamber. This force is capable of doing different kinds of works, such as a pressurized liquid to add energy input to the system through a pressure pipe into the main penstock or it can be used as a pressure energy for the desalination of saline water.

The invention relates to a moisture-proof cable. The moisture-proof cable comprises a conductive wire core which is externally wrapped by an insulating protection layer. The insulating protection layer is externally wrapped by a blocking layer which is made of elastic material. The blocking layer is externally wrapped by a moisture-proof tube which is externally wrapped by an external protection layer with a water-resistant function. The moisture-proof tube is made of porous water swelling material. Negative pressure tubes are equidistantly arranged along the axial direction of the moisture-proof tube in the tube wall of the moisture-proof tube. Capillary holes are arranged on the tube wall of the negative pressure tubes. Air extraction valves are also adjacently connected on the negative pressure tubes. The air extraction valves stretch out of the external protection layer. The moisture-proof cable is relatively low in mass, exquisite in structure, great in the moisture-proof effect and convenient for later maintenance.

The invention relates to steel used for oil and gas transportation large high pressure pipe fittings and steel pipes, pipe fittings and welding materials made of the steel. The invention is developed for solving the problems of the low grade, high carbon content, poor welding property, etc., of the present fitting used steel. The compositions of the steel are less than or equal to 0.12 percent of C, less than or equal to 0.35 percent of Si, less than or equal to 1.60 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.50 percent of Ni, less than or equal to 0.30 percent of Cr, less than or equal to 0.30 percent of Cu, less than or equal to 0.25 percent of Mo, less than or equal to 0.05 percent of Nb, less than or equal to 0.09 percent of V, less than or equal to 0.05 percent of Ti and less than or equal to 0.060 percent of Al, and the rest is Fe. When using the steel of the invention for producing the oil and gas transportation high pressure steel pipes and the welding materials, the fitting heat treatment quenching heating temperature is 900-980 DEG C. The quenching heating time is the wall thickness of the fittings in millimeter multiplied by 2-3m/mm; the tempering heating temperature is 600-700 DEG C; the tempering heating time is the wall thickness of the pipes in millimeter multiplied by 3-6m/mm. the oil and gas transportation high pressure pipe fittings of the invention can satisfy the production demands of high pressure steel pipes and fittings for X80 grade pipeline.

A filter alert has a pressure differential switch that is responsive to positive and/or negative pressure through a pressure tube. The pressure tube is in fluid communication intermediate a positive-pressure or high-pressure side of an intended filter and a positive-pressure inlet aperture of a pressure-differential switch for indication of positive pressure across the intended filter. Optionally, the pressure tube is in fluid communication intermediate a negative-pressure or low-pressure side of a filter and a low-pressure inlet aperture of the pressure-differential switch for indication of low pressure across the filter. The pressure-differential switch actuates an actuator for alarm signals for desired action. The filter alert also includes a switch condition communication component, a filter condition alert and an alert container on which the pressure-differential switch is positioned.

The invention discloses an anti-freezing method and device for a water chilling unit of an air conditioning unit. The method and the device aim at preventing frost cracking of an evaporator. According to the method, vapor-liquid two-phase-state pressure of a refrigerant of an inlet of the evaporator is controlled, and evaporation pressure in the evaporator is not lower than a certain value, so that the lowest temperature of the side, loading the refrigerant, in the evaporator is not lower than 0 DEG C. According to the device, a flow control device is connected between a compressor exhaust pressure pipe and an evaporator inlet pipeline, a pressure sensor is connected between an outlet of the evaporator and an air suction port of the compressor, and a control unit instructs to adjust the opening degree of the flow control device according to the difference between pressure after evaporation and target evaporation pressure. In comparison with the prior art, by controlling the vapor-liquid two-phase-state pressure of the refrigerant of the inlet of the evaporator, the evaporation pressure of the evaporator is not lower than the target evaporation pressure, the temperature t32 of the side, loading the refrigerant, in the evaporator is larger than 0 DEG C, and frost damage to the evaporator is prevented.

The invention relates to the production technology of a siro compact spinning covering yarn. A traditional compact spinning negative pressure pipe negative pressure groove is designed in an I-shaped straight groove mode, a cotton net is too narrow and the yarn-leakage phenomenon exists, meanwhile, the yarn hairiness is serious, evenness is poor, strength is low, fluctuation is large, and wool particles / neps are prone to being formed during a post processing process. The production technology of the siro compact spinning covering yarn enables the negative pressure pipe negative pressure groove to be designed into a V-shaped groove; meanwhile, the siro spinning technology is used, two coarse yarns are fed at the same time at one spindle position at a certain interval, the two coarse yarns are dragged respectively, an elastic filament is arranged between the two coarse filament, two fiber beams are formed in a negative pressure zone formed by the V-shaped groove after the two coarse yarns are dragged, the filament is guided to be arranged between the two fiber beams from the position behind a clustering front leather roller, and therefore the filament can be effectively wrapped, and a good covering yarn product can be manufactured.

The invention relates to a radial vibration-reducing stress-dissipating bracket for a pressure pipeline. The radial vibration-reducing stress-dissipating bracket for the pressure pipeline comprises a lower supporting block (9) and a lower bottom plate (13); the pressure pipeline (15) is supported on the lower supporting block (9); and the lower supporting block (9) is supported on the lower bottom plate (13). The radial vibration-reducing stress-dissipating bracket for the pressure pipe is characterized in that vertical type fixing brackets (11) are symmetrically arranged at two sides of the lower bottom plate (13); two radial clamping blocks (1) which are matched with the two sides of the pressure pipeline (15) are respectively connected with corresponding supporting plates (8); the supporting plates (8) are connected with corresponding vertical type fixing brackets (11) through respective fastening connecting pieces (7); and elastic supporting assemblies (20) are mounted on the fastening connecting pieces (7) and between the vertical type fixing brackets (11) and the supporting plates (8). With the adoption of the radial vibration-reducing stress-dissipating bracket for the pressure pipe, the rigidity of a piping system can be maintained and a vibrating stress generated in the radial direction of the piping system can be eliminated, thus the requirement of vibration-reducingsupport for the pressure pipeline can be satisfied.