30 results about "Dual-thrust" patented technology

The invention provides a single-compartment dual-thrust solid rocket engine and a rocket. The engine comprises a combustion chamber housing, a heat insulating layer attached to the inner surface of the combustion chamber housing, a propellant grain positioned in the combustion chamber housing, an igniter arranged at one end of the combustion chamber housing and a spray tube assembly arranged at the other end of the combustion chamber housing, wherein the propellant grain is provided with an inner hole which penetrates through the two ends of the propellant grain; the position, at one end closeto the igniter, of the inner hole, of the propellant grain is uniformly provided with a front wing slot which extends in a radial direction, and the position, at one end close to the spray tube assembly, of the inner hole, of the propellant grain is provided with a tail wing slot which extends in the radial direction; a ratio of wing slot depth of the front wing slot and the tail wing slot to thebiggest thickness of the propellant grain is greater than or equal to 0.81; and the slope range of the rear wing axial slope of the grain ranges from 160 degrees to 170 degrees. The single-compartment dual-thrust solid rocket engine is great in thrust change range, is stable in grain structure, is small in grain combustion surface change speed while an engine thrust mode is converted, can effectively reduce pressure intensity change speed of the combustion chamber, and enables thrust change speed to be gentle.

A method for monitoring a thrust fault of a turbofan during a modification of the thrust setting of the turbofan, the method including a step of processing the thrust setting via a filtering function and a transient-phase model such as to obtain a modelled thrust, a step of comparing the modelled thrust to the actual thrust such as to determine a thrust difference, a step of comparing the thrust difference to an alarm threshold; and a step of emitting an alarm in the event of exceeding the alarm threshold, wherein at a given iteration, in which the prior modelled thrust is known, the transient-phase model provides a time constant in accordance with the prior modelled thrust, and the filtering function provides a modelled thrust in accordance with the time constant obtained, the prior modelled thrust and the thrust setting.

The invention belongs to the technical field of aero-engines and particularly relates to a real thrust measuring and calculating method for test run of an aero-engine on an indoor test bed. The real thrust measuring and calculating method specifically comprises the steps of 1 determining the spatial position of a control body, 2 arranging a rear cross section measuring point on a lip rear cross section (2), 3 arranging front cross section measuring point on a far front cross section (1), 4 obtaining wind speed values and static pressure values on the measuring points, and 5 obtaining a real thrust value of the test run of the aero-engine on the indoor test bed. According to the real thrust measuring and calculating method, the area of air intake cross section of the engine is reasonably selected, the flow pipe surface for air flowing in a test run workshop serves as a control face, an air intake channel additional resistance correction formula is derived and real thrust is calculated by applying momentum theorem. The real thrust measuring and calculating method has the advantages of being clear in control body division, fewer in correction terms, simple and convenient to calculate and the like, and the problem of real thrust measurement and calculation during the test run of the aero-engine on the indoor test bed can be solved.

The invention discloses a permanent magnet polarization hybrid axial magnetic bearing. The permanent magnet polarization hybrid axial magnetic bearing comprises a rotor assembly and a stator assembly, wherein the rotor assembly comprises a rotating shaft and a rotor dual-thrust disc; the stator assembly comprises a stator shell, an upper stator end plate, an upper permanent magnet, a stator center plate, a lower permanent magnet, a lower stator end plate and a stator magnet exciting coil; the upper stator end plate and the lower stator end plate can form an outer upper air gap and an outer lower air gap together with the outer end surface of the rotor dual-thrust disc respectively, and the stator center plate and the inner end surface of the rotor dual-thrust disc can form an inner upper air gap and an inner lower air gap; the upper permanent magnet and the lower permanent magnet can axially magnetized, and magnetizing directions of the upper permanent magnet and the lower permanent magnet are opposite; the inner and outer air gaps can internally generate a permanent magnet polarization magnetic field, a magnetic field generated by the stator magnet exciting coil can regulate the permanent magnet polarization magnetic field. The magnetic bearing provided by the invention has a firm and reliable structure and high energy density, can be applied in a high-speed operation occasion, and is suitable for a high-speed system which has high power and large capacity.

The invention discloses a dual-thrust multi-cutter tunneling machine and a tunneling method thereof. The problems are solved that in the prior art, mode switching of a dual-mode tunneling machine is large in workload, long in time and high in cost. The dual-thrust multi-cutter tunneling machine includes a tunneling system, a segment splicing machine system and a slag discharging system; the tunneling system includes a shield, a cutter main body and an M-shaped beam, a plurality of split-type cutters are arranged at the front end of the cutter main body, and a segment splicing machine, an arc frame mounting device and a concrete spraying device are arranged on the M-shaped beam, wherein the arc frame mounting device is used for mounting a second thrust mechanism, the segment splicing machine is located in front of the arc frame mounting device, and the concrete spraying device is mounted in front of the arc frame mounting device; a thrust oil cylinder is arranged on the periphery of theouter ring of the M-shaped beam, and the split-type cutters correspond to the slag discharging system. According to the dual-thrust multi-cutter tunneling machine, the dual-thrust multi-cutter designis adopted; the split-type cutters replace a large cutter, the drive mode of the split-type cutters is correspondingly changed into an individual drive mode, and in this way, through the multi-cutterdesign, the cost of the cutters is greatly reduced.

The invention relates to a bearing oil groove machining technology, in particular to a clamp for machining an oil groove, shaped like the Arabic number 8, of the inner spherical face of a joint bearing and a producing and using method of the clamp. The clamp is composed of a mold with an alpha angle face, a clamping hole, a screw hole and a fastening screw rod. The screw hole is located in the surface of the mold. The fastening screw rod is correspondingly screwed into the screw hole. The center line of the mold is perpendicular to the alpha angle face of the mold. An angle alpha is formed between the center line of the mold and the rotation axis of a lathe spindle, and the angle alpha is larger than 0 degree and equal to or smaller than 15 degrees. The clamp is used for clamping the oil groove, shaped like the Arabic number 8, of the inner spherical face of the joint bearing, and therefore an oil groove, shaped like the Arabic number 8, of the inner arc spherical face of a dual-thrust joint bearing can be machined on a common lathe, the bearing can be effectively protected by the copper head fastening screw rod, and when clamped, the bearing can be clamped many times by performing alignment one time; and the using method is easy to operate, and size control is more convenient and accurate.

The invention provides an elbow-type dual-thrust hydraulic centralizer. The elbow-type dual-thrust hydraulic centralizer comprises a hydraulic thrust system and a centering system, wherein the hydraulic thrust system comprises a main body, hydraulic cylinders and a retaining system; the hydraulic cylinders are arranged on the main body; a piston is arranged in each hydraulic cylinder; the hydraulic cylinders and the pistons act on the centering system through in-pipe pressure building to realize centering; the retaining system can realize permanent centering after in-pipe pressure relief; the centering system comprises a push ring, a positioning block and at least four groups of elbows uniformly distributed on the circumference of the main body; the push ring is connected with the pistons; the positioning block is fixed to the middle of the main body; one end of each elbow is fixed on the push ring, and the other end of each elbow is fixed on the positioning block; an included angle is formed between each elbow and the main body; and the centering system can be started up by an extremely small starting force. The bidirectional hydraulic system ensures no axial displacement of the centering system; owing to the unique pre-bending structural design, the starting force of the centering system becomes smaller; and the elbow-type dual-thrust hydraulic centralizer is suitable for centering casings of both horizontal wells and highly-deviated wells.

The invention discloses a dual-thrust electromagnet damping mechanism, and belongs to the technical field of elevator traction machines. The damping mechanism is symmetrically sleeved on the outside of a push rod and arranged on the outside of an electromagnet core. The damping mechanism on each side comprises a cover plate, a striking plate and multiple stages of damping pads, wherein the cover plate and the striking plate are oppositely arranged to form a cavity, and the multiple stages of damping pads are arranged in the cavity; each stage of damping pad in the multi-stage damping pad is composed of a plurality of damping blocks, the damping blocks are centrosymmetrically arranged through taking the push rod as a central shaft, and the two sides of each damping block are respectively in vertical contact with the cover plate and the striking plate; and each stage of damping pad at least contains two independent columnar structures. According to the invention, because mutually-separated multi-body damping pads are adopted, the damping pads can be repaired or replaced without adjusting key components such as braking arms and electromagnets and the like; and due the application of a multi-stage damping principle, the damping pads are effectively protected while low noises are ensured, so that a situation that the damping pads are over-impacted is avoided, thereby greatly prolonging the service life of the damping pads.

A dual thrust bearing is disclosed. The dual thrust bearing may have a shell. The shell may extend from a compressor end to a turbine end opposite the compressor end. The shell may have a shell bore extending from the compressor end to the turbine end. The shell bore may be configured to receive a journal bearing. The shell may also have a first thrust bearing face disposed adjacent the compressor end. In addition, the shell may have a second thrust bearing face disposed adjacent the turbine end.

The invention relates to an equidirectional dual-thrust electromagnetic relay, which consists of a main body, an electromagnetic contact, a permanent magnet and double spring plates. Input ends of two upper and lower contacts of the main body are connected with an input power, while output ends thereof are adapted with the electromagnetic contact. The electromagnetic contact is fixed between the output ends of the two contacts of the main body by rotating contenting points. A lower end of a static spring plate of the double spring plates is connected on a phase output end. An upper end of a dynamic spring plate of the double spring plates is fixedly connected with an upper end of the static spring plate, while a lower end thereof is linked with the permanent magnet. The permanent magnet takes a shape of right-angle trisquare. The permanent magnet connected with a connecting end of a conducting strip is arranged on one side, and a static contact fixedly connected with the dynamic spring plate of the double spring plates and a dynamic contact movably connected with the static spring plate of the double spring plates are arranged on the other side. The invention has meticulous design and light and reliable structure, realizes improvement of the functions of the relay by using the basic physical principles, has high practical value and can effectively improve the working reliability of the electric power circuit.

The invention discloses a synchronous working method and system for double thrusters of an electric propulsion system. The method is suitable for a synchronous working mode of multiple thrusters of a spaceflight electric propulsion system. According to the method, an ignition process is optimized, synchronous thrust generation of double thrusters is achieved through the functions of anode slow start, closed-loop control and the like, and the thrust magnitude is basically consistent; and through fault diagnosis logic, the problem of inconsistent thrust of the thruster caused by accidental abnormality of a single thruster is solved. Attitude instability caused by accumulation of angular momentum of a spacecraft is avoided.

The invention discloses a camshaft bearing cover thrust structure. The camshaft bearing cover thrust structure comprises a cylinder cover, a camshaft and a camshaft bearing cover, wherein an intake side cam bearing base and an exhaust side cam bearing base are arranged at the top end of the cylinder cover; the camshaft comprises an intake side camshaft and an exhaust side camshaft; thrust stop ring grooves are formed in the inner ends of the intake side camshaft and the exhaust side camshaft; the inner ends of the intake side camshaft and the exhaust side camshaft are arranged in the intake side cam bearing base and the exhaust side cam bearing base, arranged at the top end of the cylinder cover side by side, through the respective thrust stop ring grooves; the camshaft bearing cover is anintegral camshaft bearing cover, and is provided with an intake side camshaft bearing cover and an exhaust side camshaft bearing cover; and the intake side camshaft bearing cover and the exhaust sidecamshaft bearing cover cooperate with the intake side cam bearing base and the exhaust side cam bearing base of the cylinder cover to fasten the intake side camshaft and the exhaust side camshaft. The camshaft bearing cover thrust structure achieves dual thrust functions, and is reasonable in structure, low in production cost and easy to popularize.

The invention provides a variable-expansion-ratio spray pipe of a single-chamber double-thrust solid rocket engine. The variable-expansion-ratio spray pipe comprises an engine rear end socket, a rear end socket inner heat insulation layer, a long tail pipe, a long tail pipe inner heat insulation layer, a spray pipe shell, a throat liner assembly and a spray pipe expansion section. The nozzle expansion section is of a segmented structure with a front section and a rear section, and the rear section is made of a metal material which is easy to ablate. When the high pressure intensity of the single-chamber double-thrust engine is converted into the low pressure intensity, the expansion ratio of the spray pipe is automatically converted to adapt to the change of the pressure intensity of an outlet of the spray pipe, and the expansion ratio requirement for complete expansion of the single-chamber double-thrust solid rocket engine under different thrust sections is met.

A dual-thrust toothed belt type lifter with a spring-strip buffering gear and a self-adaptive sliding block comprises a drive mechanism, a lifter bracket and a lifter base and is characterized in that the lifter bracket is of a rectangular strip-shaped tube body; a seam is formed longitudinally in the side wall of the tube body to form a sliding rail; a rectangular toothed belt guide groove is formed in the internal wall of the tube body of the lifter bracket; and a flexible toothed belt capable of twitching up and down is arranged in the toothed belt guide groove; the toothed belt is engaged with a toothed belt drive gear, which is arranged on the lifter base, at the lower end of the lifter bracket; and a pinch roller for compacting, extruding and pushing the toothed belt is arranged on the back of the toothed belt at the engaged position. The beneficial effects are as follows: the roller body capable of rolling is arranged on the back of the toothed belt at the engaged position of the toothed belt, so that the abrasion is reduced; when the sliding block suffers from abrasion, a pressure spring props against a pulley block to move forward so as to compensate the abrasion of the sliding block; the drive gear is a buffering gear which plays a role in protecting the gear, so that the service life of the lifter is prolonged.

This invention discloses a manufacturing technology for gas safety valves of a magnetic dual-thrust motor including the following steps: a, providing a primary alnico shift guide-way matched to the groove on the primary at the place opposite to motor box and the primary alnico, b, providing a system connector to connect and fix the motor box and a valve, c, providing a sub-alnico shift guide-way by a connecting bolt under the system connector and an inverted repulsion alnico is set at its bottom, d, a U-shape matcher with the sub-alnico is provided out of it, in which, the opposite faces of the primary and the sub-alnicos are homopolar and the opposite faces of the sub-alnico and the inverted-repulsion alnico are also homopolar. Since the motor and gas are isolated completely, it stops the contact of electric sparks with gas when the motor is working to avoid burning or explosion caused possibly.

The invention discloses a double-thrust-rod fixing seat based on an 8.1-meter full-bearing city bus. The double-thrust-rod fixing seat comprises a fixing seat bottom plate, two fixing seat bodies, a left reinforcing vertical plate and a right reinforcing vertical plate; the fixing seat bodies are left square bracket-shaped, and the two fixing seat bodies are fixedly connected with the two ends ofthe same side of the fixing seat bottom plate through the back surfaces correspondingly; grooves of the two fixing seat bodies correspond to each other, and mounting holes are formed in the top ends of two supporting legs of the two fixing seat bodies correspondingly; the left reinforcing vertical plate and the right reinforcing vertical plate are fixed to the outer side walls of the two ends of the two fixing seat bodies correspondingly; and the side wall faces of the left reinforcing vertical plate and the right reinforcing vertical plate are fixedly connected with the fixing seat bottom plate. According to the double-thrust-rod fixing seat, the structure is compact, the material consumption is reduced, the overall welding composition is simple, the overall weight after welding is light,the design target of light weight of the whole vehicle is met, the severe condition of long-term overload operation is met, and the manufacturing cost is greatly reduced.

The invention belongs to the field of engineering machinery design, and particularly relates to a double-thrust self-balancing uniform-load structure bearing for a high-speed rotor. A double-thrust self-balancing uniform-load structure bearing for a high-speed rotor comprises a feedback assembly, a front balance block, a front thrust pad, a bearing copper alloy, the rotor, a rear balance block and a rear thrust pad, the inner edge of the front end of the feedback assembly is in press fit with the front balance block, the outer edge of the rear end of the feedback assembly is in press fit with the rear balance block, the front balance block tightly presses the front thrust pad, and the rear balance block tightly presses the rear thrust pad. The rear balance block compresses the rear thrust pad, and the surfaces, attached to the rotor, of the front thrust pad and the rear thrust pad are plated with bearing copper alloy. The double-thrust self-balancing structure avoids the limitation that an existing thrust bearing can only bear thrust through a single thrust surface, optimizes the structural size, meets the rotor operation requirements of strict structural size requirements, large load and high rotating speed, and has wide application value.

A dual-thrust toothed belt type lifter with a buffering gear and a self-adoptive sliding block comprises a drive mechanism, a lifter bracket and a lifter base and is characterized in that the lifter bracket is of a rectangular strip-shaped tube body; a seam is formed longitudinally in the side wall of the tube body to form a sliding rail; a rectangular toothed belt guide groove is formed in the internal wall of the tube body of the lifter bracket; and a flexible toothed belt capable of twitching up and down is arranged in the toothed belt guide groove; the toothed belt is engaged with a toothed belt drive gear, which is arranged on the lifter base, at the lower end of the lifter bracket; and a pinch roller for compacting, extruding and pushing the toothed belt is arranged on the back of the toothed belt at the engaged position. The beneficial effects are as follows: the roller body capable of rolling is arranged on the back of the toothed belt at the engaged position of the toothed belt, so that the abrasion is reduced; when the sliding block suffers from abrasion, a pressure spring props against a pulley block to move forward so as to compensate the abrasion of the sliding block; the drive gear is a buffering gear which plays a role in protecting the gear, so that the service life of the lifter is prolonged.