16 results about "Central pressure" patented technology

The invention provides a five-hole probe correction method, which is used for correcting a five-hole probe in a cascade test, a left side pressure measurement hole of the corrected five-hole probe is a first hole, a central pressure measurement hole is a second hole, a right side pressure measurement hole is a third hole, a lower pressure measurement hole is a fourth hole, and an upper pressure measurement hole is a fifth hole. The correction method comprises the following steps: S1, acquiring a calibration curve of the five-hole probe, and acquiring total pressure distribution of a cascade outlet; s2, calculating to obtain a corrected pressure measurement value of the first hole and a corrected pressure measurement value of the third hole; s3, obtaining a corrected yaw angle and a corrected pitch angle by using the calibration curve; and S4, obtaining a corrected total pressure value and a corrected static pressure value by using the calibration curve. According to the invention, the problem of measurement distortion of angle measurement and pressure measurement of the probe calibration curve obtained under the condition of uniform incoming flow in wake measurement with non-uniform actual circumferential total pressure is solved, and the airflow angle in the wake of the cascade can be measured more accurately.

The invention relates to the technical field of rotational flow flame holders, and discloses a rotational flow flame holder and multistage air distribution device of a linear flame treatment combustor, the rotational flow flame holder and multistage air distribution device comprises a barrel, a flame stabilizing mechanism is arranged in the barrel, the flame stabilizing mechanism comprises a guide barrel, the guide barrel is located in the barrel, and the guide barrel is located in the barrel. The surface of the guide cylinder is fixedly connected with three first mounting plates distributed circumferentially, and the ends, away from the guide cylinder, of the first mounting plates are fixedly connected with the inner wall of the cylinder body. According to the invention, the inclined guide plate of the guide cylinder enables airflow to form primary rotational flow, the gas-liquid contact area is enlarged, the central pressure is reduced, a foundation is laid for flame root stabilization, the inclined guide plate of the flame stabilizing cylinder further strengthens the rotational flow, a high-strength rotational flow field is formed, and a backflow area formed by the rotational flow field entrains high-temperature combustion products and continuously heats unburned mixed airflow; the flame is kept in a stable combustion state in dynamic airflow, and the mixing efficiency of fuel and air is improved.

The invention discloses a magnetic type explosion suppression device capable of directionally throwing, and belongs to the technical field of explosion safety protection. The device comprises a magnetic attraction base, a main cylinder body, a hydrogen leakage detection device, an aerogenesis power cabin, a piston casting assembly and a plurality of explosion suppression sub-balls pulled by inhaul cables. A central pressure-bearing column, a piston and an aerogenesis power cabin are arranged in the main cylinder body from top to bottom; the explosion suppression sub-ball is loaded in a positioning groove in the top of the piston and connected with the top end of the center pressure-bearing column through a fixed-distance pulling and launching mechanism, and the top end of the explosion suppression sub-ball is locked through a fixing pull ring. During working, the detector transmits a signal to trigger the aerogenesis power cabin to work, and the piston is pushed to cast the sub-ball array to a predetermined space; and the stay rope is straightened immediately, the safety pin of the sub-ball is pulled out, an internal pure mechanical percussion and gas generation mechanism is triggered, the sealing film is broken through to release the explosion suppressant, and a uniform and three-dimensional explosion suppression cloud cluster is formed. The device has the advantages of being convenient to install, rapid in response, uniform in air release, free of coverage dead angles and the like, and is particularly suitable for directional active protection of limited spaces such as hydrogen energy equipment cabins.

The utility model discloses an anti-blocking device of a squat silo center pressure reducing pipe, and particularly relates to the technical field of granaries, the anti-blocking device comprises a pressure reducing pipe main body, the upper surface of the pressure reducing pipe main body is communicated with a feeding pipe, and an anti-blocking assembly is installed in the feeding pipe; and the anti-blocking assembly comprises a first motor, the first motor is fixedly installed in the feeding pipe, a gear is fixedly installed at the output end of the first motor, one side of the gear is meshed with a fluted disc, and the inner side of the fluted disc is fixedly connected with a rotary drum. Compared with the prior art, the anti-blocking assembly is arranged, the rotating cone is used for driving the second spiral blade to rotate on the inner side of the feeding pipe, then the rotating drum is used for driving the first spiral blade to rotate on the inner side of the feeding pipe, grains on the inner side of the feeding pipe can be effectively and rapidly dispersed, stagnation and deposition of the grains in the feeding pipe can be reduced, and the grain conveying efficiency is improved. And the mobility of grains can be kept, so that the risk of blockage is reduced, and good ventilation can be conveniently kept in the pressure reducing pipe main body.

This invention relates to the field of functionally graded materials, specifically to a multidimensional gradient composite material structure and its design method for high-speed impact loading. The composite material structure includes a main body composed of multiple material gradients, a function-controlled outer edge slope, and a bottom high-density layer. By adjusting the side pressure distribution and enhancing the central pressure through the high-density layer, the deformation of the homogeneous material under high-speed loading is effectively reduced, with a maximum deformation ≤0.06mm, and the launch velocity is increased, with a central final velocity ≥13km / s. This invention is applicable to three-stage lightweight gas gun loading technology, providing high-precision data support for protective material research in aerospace and planetary science fields.

This invention discloses a fluid wall shear and compressive stress composite array sensor chip, belonging to the field of MEMS sensor technology. It includes several shear stress sensors and compressive stress sensors integrated on the chip. The shear stress sensors are arranged in a cross-shaped array, while the compressive stress sensors are arranged in a zigzag shape. These two arrays are concentrically superimposed to obtain a grid array layout. A pressure sensor is positioned at the center of the grid array. Several shear stress sensors are arranged radiating outwards along the cross-shaped direction with the central pressure sensor as the radiation center, used to measure two-dimensional shear stress. Several compressive stress sensors are arranged radiating outwards along the zigzag direction with the central pressure sensor as the radiation center, used to measure gradient pressure. This invention solves the problem that single-point measurements are insufficient to fully reflect the actual flow field stress distribution in complex fluid environments.

This invention discloses a prestressed anchorage system using pre-tensioned steel strands and its construction method. The system includes an upper anchor head, steel strands, a stabilizing plate, an isolation pipe, a central pressure bar, and a lower anchor head. The steel strands pass sequentially through the lower anchor head, the stabilizing plate, and the upper anchor head, with both ends connected to the upper and lower anchor heads respectively. The stabilizing plate is installed at intervals on the steel strands and fixedly connected to them. A through hole is provided in the center of the stabilizing plate, through which the isolation pipe passes. The central pressure bar passes through the isolation pipe. This invention utilizes steel strands and anchorages to form a self-balancing pre-tensioned steel strand prestressed anchorage system with the central pressure bar. This system offers secure anchorage, reliable performance, high material utilization, and convenient and quick on-site construction. The pre-tensioned steel strand prestressed anchorage system using a pressure release device allows for rapid release of large-tonnage prestress and steel strand tensioning. Construction is convenient, quick, and efficient. The tensioning platform and jacks can be removed after tensioning, improving equipment utilization.

The invention relates to a pneumatic system for controlling the position of an actuator element, comprising a pneumatic actuator which comprises the actuator element as well as a first pressure chamber and a second pressure chamber, and a valve device which has a first working outlet pneumatically connected to the first pressure chamber and a second working outlet pneumatically connected to the second pressure chamber, and is designed to separately adjust respective compressed air mass flows at the working outlets as part of the position control in order to pneumatically actuate the first pressure chamber and the second pressure chamber and thereby position the actuator element, wherein the pneumatic system has a position control device which is designed to generate a mass flow specification signal underlying the compressed air mass flows, and a center pressure regulator unit which is designedto carry out a pressure control of a mean pressure of the first pressure chamber and second pressure chamber as part of the position control.,

The invention provides a press segmented closed track generation method based on consistency safety Bayesian optimization, and the method comprises the steps: extracting a compaction response and infiltration capacity parameter range under the upper limit constraint of a press through a force-displacement curve and an in-mold pressure signal which are obtained through one-time pressure test; establishing an extrusion flow and gas discharge combined calculation model under mould geometry and cavity boundary conditions, and determining displacement points when the edge sealing starts and finishes displacement and the central pressure reaches a drop threshold value; introducing the physical constraints into a scoring network, determining the speed and the residence time of each section in a trajectory parameter range by adopting secure Bayesian optimization, generating a target section closed trajectory which meets the condition that the central pressure is reduced to a threshold value before edge sealing and does not trigger the upper limit of equipment, and outputting a corresponding control instruction; according to the method, under the condition of considering material and working condition fluctuation, the exhaust reliability and the forming quality in the pressing forming process are improved, and takt time and equipment safety are both considered.

The invention discloses an acoustic tuning material testing jig and testing device, the jig comprises an upper cover and a base, a charging groove is arranged in the base, and a sound outlet hole is arranged in the charging groove; a sound inlet hole is formed in the upper cover and is opposite to the sound outlet hole up and down; the bottom surface of the upper cover is provided with a positioning convex ring protruding downwards and a central pressing plate, the central pressing plate and the positioning convex ring are located on the inner side and the outer side of the sound inlet hole, and the central pressing plate is connected with the main body part of the upper cover; and after the upper cover is arranged in the base, the central pressing plate and the positioning convex ring respectively press the edges of the inner and outer sides of the to-be-tested tuning material. Therefore, the tuning material is convenient to fix and can be conveniently taken out for continuous use after testing, and waste is avoided. The tuning material can be tested according to the shape in normal use, and the test result is more consistent with the acoustic performance of the tuning material in an actual product. The whole testing device is provided with the lifting mechanism for placing the artificial ear and the jig, so that the error generated when the distance is adjusted due to large weight can be reduced, and the testing precision is higher.

The present invention discloses a vacuum flask with a lid and a central pressure switch, which prevents splashing and incorrect installation, comprising a flask body and a lid, wherein the lid comprises an upper cover, a sliding switch, a central pressure switch and an inner stopper, wherein a combined sealing ring is provided on the lower part of the inner stopper, wherein an annular projection and an extension are formed on the upper part and the lower part of the combined sealing ring respectively, wherein when the lid is connected to the flask opening part of the flask body, the annular projection rests tightly against the inside of the flask opening part and the extension rests tightly against a rib on the inner wall of the flask opening part;wherein the can opening part is provided with a positioning lock which interacts with the slide switch, wherein an annular shoulder with a positioning channel is provided on the inner stopper in which a latch of the slide switch is arranged during installation, wherein a discharge channel wall is formed on the inner wall of the can opening part associated with the spout, wherein the side surface of the annular shoulder is adapted in its shape to the corresponding area of ​​the discharge channel wall. The invention is simple in design, easy to assemble and can prevent splashing and incorrect installation by means of the design of the combined sealing ring and the annular shoulder.

The fixing equipment comprises a main polishing head, the main polishing head comprises a pressure plate and a plurality of clamping blocks installed in the circumferential direction of the pressure plate, a ceramic disc is arranged on one side of the pressure plate in an abutting mode, and the clamping blocks abut against the circumferential direction of the ceramic disc. A plurality of wafers are evenly arranged on the side, away from the pressure plate, of the ceramic disc, a pressurizing assembly is arranged in the pressure plate and comprises a pressurizing hole, a piston structure, a pressurizing plate, a cover plate and an air inlet nozzle, the pressurizing hole is formed in the center of the pressure plate and penetrates through the pressure plate, and the piston structure is arranged in the pressurizing hole in a sliding mode; the piston structure blocks the pressurizing hole, the pressurizing plate is installed on the side, facing the ceramic disc, of the piston structure, the cover plate is installed on the pressure plate on the side, away from the ceramic disc, of the pressure plate, the pressurizing hole is closed by the cover plate, and the air inlet nozzle is installed on the cover plate and communicated with the pressurizing hole. The method has the effect of improving the flatness of the surface of the wafer.

The invention provides a double-flow hydraulic energy self-driving type foundation pit gushing water pressure relief, leakage stoppage and grouting integrated recoverable device. The problems that an existing pressure relief and leaking stoppage means is single, low in efficiency and poor in collaboration, water pressure energy is not fully utilized, external equipment is excessively relied on, the sealing effect is poor due to insufficient flexibility, the adaptability is limited due to the fixed size, and repeated utilization cannot be achieved are effectively solved. According to the technical scheme, a pressure relief grouting barrel is installed on the rear portion of the flow guide cover, umbrella face type leaking stoppage sealing rings are installed on the two sides of the flow guide cover, a central pressure relief pipe is arranged on the front portion of the flow guide cover, a sharp flow guide cone is installed on the front portion of the central pressure relief pipe, and circumferential pressure relief pipes are arranged in the middles of the two wings of the flow guide cover. The grouting pipes are arranged on the edges of the two wings of the flow guide cover, the center one-way valve is installed on the rear portion of the center pressure relief pipe, the circumferential one-way valve is installed on the rear portion of the circumferential pressure relief pipe, and the differential pressure grouting valves are installed on the rear portions of the grouting pipes.

The utility model relates to the technical field of granaries, and discloses a splicing type squat silo center pressure reducing pipe which comprises a center pressure reducing pipe body, and one end of the center pressure reducing pipe body is fixedly connected with a splicing assembly. The splicing assembly comprises a splicing ring, the splicing ring is fixedly connected to one end of the center pressure reduction pipe body, a plurality of clamping grooves are formed in the two sides of the splicing ring, a splicing sleeve is fixedly connected to the other end of the center pressure reduction pipe body, mounting grooves are formed in the two sides of the splicing sleeve, sliding grooves are formed in the two sides of the mounting grooves, and a plurality of penetrating grooves are formed in the two sides of the splicing sleeve. A two-way lead screw is rotationally connected into the mounting groove, and the two ends of the two-way lead screw are in threaded connection with moving blocks. The center pressure reducing pipe is convenient to splice and assemble, the utilization rate of bolts is reduced, the difficulty in splicing the center pressure reducing pipe is reduced, the mounting efficiency of the center pressure reducing pipe during field mounting after transportation is improved, meanwhile, the dismounting efficiency of the pressure reducing pipe when the pressure reducing pipe is damaged and needs to be replaced is improved, and time and labor are saved.

The present invention relates to a polytetrafluoroethylene pipe isostatic forming device and a forming process thereof, comprising a tubular outer mold, a central pressure tube, a head module and a rubber membrane cylinder; the specific process is as follows: S1: forming device station distribution; S2: polytetrafluoroethylene powder feeding; S3: head locking and sealing; S4: pressure molding; S5: pressure holding molding; S6: pressure relief and material taking; S7: sintering; the pipe is formed by internal pressure molding of the polytetrafluoroethylene pipe, and the central pressure tube can meet the high-pressure water flow while ensuring the rapid assembly and locking of the head module; when disassembling and installing the head module, it is only necessary to loosen or tighten the tightening nut, which improves the loading and unloading efficiency and is convenient to operate; the molding device adopts a multi-station structure to complete the powder feeding, device locking, pressure molding, pressure holding molding and pressure relief and material taking of the polytetrafluoroethylene pipe at each station; fully realizes the streamlined production, and the efficiency is greatly improved.