204results about How to "Reduce mechanical loss" patented technology

A micromechanical resonator device and a method of making the micromechanical resonator device, as well as other extensional mode devices are provided wherein anchor losses are minimized by anchoring at one or more side nodal points of the resonator device. Lower damping forces are experienced by the resonator device when operated in air.

High-Q micromechanical resonator devices and filters utilizing same are provided. The devices and filters include a vibrating polysilicon micromechanical “hollow-disk” ring resonators obtained by removing quadrants of material from solid disk resonators, but purposely leaving intact beams or spokes of material with quarter-wavelength dimensions to non-intrusively support the resonators. The use of notched support attachments closer to actual extensional ring nodal points further raises the Q. Vibrating micromechanical hollow-disk ring filters including mechanically coupled resonators with resonator Q's greater than 10,000 achieve filter Q's on the order of thousands via a low-velocity coupling scheme. A longitudinally mechanical spring is utilized to attach the notched-type, low-velocity coupling locations of the resonators in order to achieve a extremely narrow passband.

The invention discloses a two-stage air-suspending centrifugal electric direct drive air compressor. The two-stage air-suspending centrifugal electric direct drive air compressor comprises a shell, amotor stator, a spindle, impellers, lock nuts, volutes and a cooling system, wherein the shell, the motor stator and the spindle are sequentially arranged from outside to inside, the impellers, the lock nuts and the volutes are arranged on the two sides of the spindle, and the cooling system is arranged on the shell. The two-stage air-suspending centrifugal electric direct drive air compressor hasthe beneficial effects that the shell, the motor stator, the spindle, the impellers and the volutes are integrally designed, and the size and the weight of the whole machine are reduced. The two stages of impellers are connected in series through a middle pipeline, and small flow and the high-pressure ratio are achieved. Axial thrust of the two stages of impellers can be mutually offset, and axial force applied by thrust bearings is reduced. Radial and axial air bearings are adopted, gas films are formed through high-pressure gas generated by the bearings, friction between the bearings and arotor is reduced, air-suspending motor high-speed direct drive is formed, and mechanical losses are reduced. Part of compressed gas is introduced into a machine shell assembly through the middle pipeline, the motor stator, the spindle, the radial bearings and the thrust bearings are cooled, and the service life of the air compressor is prolonged.

A micromechanical resonate device having an extensional wine-glass mode shape is described herein. Different embodiments of the device may employ vibrating polysilicon micromechanical ring resonators, utilizing a unique extensional wine-glass mode shape to achieve lower impedance than previous UHF resonators at frequencies as high as 1.2-GHz with a Q of 3,700, and 1.47-GHz (highest to date for polysilicon micromechanical resonators) with a Q of 2,300. The 1.2-GHz resonator exhibits a measured motional resistance of 560 kΩ with a dc-bias voltage of 20V, which is 6× lower than measured on radial contour mode disk counterparts at the same frequency, and which can be driven down as low as 2 kΩ when a dc-bias voltage of 100V and electrode-to-resonator gap spacing of 460 Å are used. The above high Q and low impedance advantages, together with the multiple frequency, on-chip integration advantages afforded by electrostatically-transduced μmechanical resonators, may be utilized in the front-end RF filtering and oscillator functions needed by wireless communication devices.

The invention discloses an easy and fast seedling method for hybrid pear seeds, which comprises the steps of fruit management, seed management and seedling management, wherein the fruit management is as follows: hybrid fruits can be collected in 5-10 days before morphological maturity and are aired and pre-arranged for 3-4h, and then are instantly arranged in a miniature mechanical refrigeratory for refrigeration under the temperature of 3-5 DEG C and a humidity of 85-95 percent; and the hybrid fruits can be stored until the first ten-day period of January in next year in the refrigeratory; the seed management is as follows: the hybrid fruits are delivered from the refrigeratory and are immediately cleaned and then are aired for 48h under a room temperature (0-10 DEG C); then the hybrid fruits are dipped for 0.5-1.0h by formaldehyde (formalin) 100 times liquid with a concentration of 40 percent; and then the hybrid fruits are directly sown without sand storage and lamination; and the seedling management is as follows: when the cotyledons of the seedlings are developed to two cotyledons and one core, the cotyledons are directly transplanted to a selective nursery in the current year with a permanent planting density of 2.0m*1.0m; and only the central trunks of the seedlings are maintained for extended growing so as to increase the height of crowns and try to enter the 'childhood length' of the adult stage as early as possible and shorten the childhood period.

Disclosed is a wave energy swaying type liquid metal magnetic fluid power generation floating tube which is composed of a hook ring (1), a floating tube shell (2), storage containers (3-1) and (3-2), a power generation channel (4), a magnet (5), electrodes (6), a power output system (7) and liquid metal (8). The power generation floating tube floats on the sea and sways along with the wave surge. The liquid metal (8) moves back and forth in the power generation channel (4) along with the swaying of the floating tube shell (2), and interacts with the magnetic field generated by the magnet and generates induced electromotive force; then the electricity power is output through the plate electrodes (6) and the power output system. The wave energy swaying type liquid metal magnetic fluid power generation floating tube of the invention has the advantages of high conversion efficiency, large power density, compact and simple structure, low cost and good mobility; and is easy for commercial popularization.

The invention discloses a swing wing type ocean current energy power generating device. The swing wing type ocean current energy power generating device comprises a supporting frame, a motion mechanism is connected to the supporting frame and connected with an energy extracting mechanism, the energy extracting mechanism comprises a crank and rocker mechanism which transmits energy extracted from the motion mechanism to an energy conversion mechanism, and the energy conversion mechanism comprises a power generator; and the motion mechanism is connected with an attack angle adjusting mechanism, and the attack angle adjusting mechanism adjusts and controls an attack angle degree of the motion mechanism so as to enable the motion mechanism to achieve preset pitching motion. The hydrofoil attack angle adjusting mechanism is arranged, so that the problem in control over the hydrofoil attack angle degree is solved; and as the hydrofoil pitching motion is accurately controlled by monitoring the position of a swing rod, the swing wing type ocean current energy power generating device can adapt to different water flow speeds, kinetic energy of the water flow is sufficiently captured, and the power generation efficiency and power are improved. A transmission system composed of a four-link mechanism and a synchronization belt in a transmission manner is used, so that the structure is simple, mechanical losses are small, and the conversion efficiency is high.

The invention discloses a thermal management system for an engine and an engineering machine. The thermal management system comprises a heat radiator, a fan, a sealed engine compartment, a first temperature detecting device and / or a second temperature detecting device, an opening regulating mechanism and a control unit, wherein the engine and the fan are arranged in the engine compartment; the engine compartment is provided with a controllable air outlet; the control unit is used for controlling the rotation speed state of the fan according to first temperature information output by the first temperature detecting device and the second temperature information output by the second temperature detecting device and / or controlling the opening state of the controllable air outlet by virtue of the opening regulating mechanism so as to enable the engine to be in a preset temperature range. A closed loop mode is adopted for combining heat dissipation of the fan and heat dissipation of an internal flow field of the engine compartment to manage the heat dissipation of the engine, so as to adapt to heat dissipation or heat engine demands of various engine operating conditions in different climatic environments, and power loss can be reduced while the engine can be in the preset temperature range.

The invention relates to a centrifugal pump impeller with a low specific speed. The centrifugal pump impeller comprises a front cover plate, a rear cover plate and main blades, wherein the front cover plate and the rear cover plate are respectively of a circular disc structure; and a plurality of main blades are uniformly distributed between the front cover plate and the rear cover plate along an axial direction and are fixedly connected with the front cover plate and the rear cover plate. The centrifugal pump impeller with the low specific speed is characterized in that rear bent inlet sections are arranged on the parts, close to the center of the impeller, of the main blades; front bent outlet sections are arranged on the parts, close to the edge of the impeller, of the main blades; the bending directions of the rear bent inlet sections are opposite to the rotating direction of the impeller; the bending directions of the front bent outlet sections are opposite to the bending directions of the rear bent inlet sections; the rear bent inlet sections and the front bent outlet sections are smoothly connected with each other; and a plurality of short blades are arranged between each two adjacent front bent outlet sections. The centrifugal pump impeller with the low specific speed is good for overcoming flow releasing and secondary flow in a flow channel, thus reducing the waterpower loss, improving the working efficiency and realizing the aim of saving energy and water.

A pontoon and water flow power generation combined power station comprises a pontoon. A belt hydraulic engine type water flow power generation device, a solar power generation device and / or wind driven power generation device are arranged on the pontoon, and the belt hydraulic engine type water flow power generation device is provided with an automatic working water level regulating unit, a super-flood preventing unit and a float cleaning unit. A belt hydraulic power generator, a magnetic suspension wind driven power generator and a solar power generator are assorted mutually and are integrated with the shore supply to realize interaction and compensation, and specifically, power generated from flood and / or wind and solar energy in peak periods is fed back to the shore supply, and the shore supply resupplies power for the pontoon when in off-peak periods of flood and / wind and solar energy, so that uninterrupted power supply is formed, and the multipurpose pontoon with new clean energy self-generating devices is assembled. Besides, automatic control and dispatching of various power supplies can be realized, and accordingly the pontoon and water flow power generation combined power station has the advantages of operational simplicity, safety and reliability, high efficiency, adaptability to non-professional management, and can be used as a composite marine facility with double functions of the pontoon and the power station or can be used as a special shore power station utilizing integral energy.

The invention relates to the engine distribution field, in particular to an engine valve control mechanism. The invention comprises an oil pump (1) driven by an engine crankshaft. The oil outlet end of the oil pump (1) is provided with a one-way valve (2). The oil outlet end of the one-way valve (2) is connected with the oil inlet end of an electromagnetic valve or an electromagnetic valve group (4). The oil outlet end of the electromagnetic valve or the electromagnetic valve group (4) is connected with a control device to control the lift range of an engine valve and a tank, respectively. As the invention cancels a cam mechanism and a timing transmission system in the traditional engine valve mechanism, the structure of the invention is simple; mechanical loss is reduced; gas distribution is optimized; desirable valve timing and valve lift range are achieved; economical efficiency and dynamic property of fuel of the engine are improved.

The invention relates to a composite surface modification method for ultra-high molecular weight polyethylene (UHMWPE) fibers. The method comprises the steps of uniformly mixing potassium dichromate, water and concentrated sulfuric acid according to the weight ratio of (7: 10: 100) to (7: 15: 200), so as to prepare a modifying agent, submerging the UHMWPE fibers into the modifying agent, carrying out ultrasonic treatment for 3-10 minutes at the ultrasonic temperature of 35-45 DEG C, and cleaning and drying the UHMWPE fibers, wherein the ratio of the UHMWPE fibers to the modifying agent is (0.3-0.5)g: 100ml. According to the method, the UHMWPE fibers are subjected to composite surface modification by combining ultrasonic wave and chromic acid solution oxidation technologies, so that the temperature of single liquid phase oxidation treatment can be greatly lowered, and the mechanical loss of the fibers is reduced; the surface roughness of the fibers and the content of polar functional groups in the surfaces of the fibers can be effectively improved, so that the interface bond strength of a polymer-matrix composite material of the fibers is improved, and thus, the method has an important practical application value.

The invention discloses a flue gas desulfurization system. The flue gas desulfurization system comprises a first-level absorption tower and a second-level absorption tower which are sequentially communicated, wherein a bubbling bed is arranged in the first-level absorption tower, a fast bed is arranged in the second-level absorption tower, and each of the first-level absorption tower and the second-level absorption tower is loaded with powdered activated carbon. The flue gas desulfurization system has the advantages that fluidized bed double-tower absorption using activated carbon as the desulfurization absorbent is adopted, the bubbling bed is used for first-level absorption, sufficient contact time between the activated carbon and flue gas is guaranteed, and the fast bed is used for second-level absorption to deeply purifying the flue gas; the double-tower design can increase the effective utilization rate of outlet absorbent sulfur capacity on the basis that the overall desulfurization efficiency is guaranteed, the absorbent activated carbon participates in the reaction in a powered state, the mechanical loss of the activated carbon is reduced, the overall utilization rate of the activated carbon is increased, and the activated carbon desulfurization energy consumption and activated carbon consumption can be lowered.

The invention discloses a pressure-ratio adjustable engine, which comprises at least one cylinder, a piston connected with a crank via upper and lower connecting rods, and one or two swing rods. The lower end of the upper connecting rod that connected with the piston and the upper end of the lower connecting rod that connected with the crank are hinged via an eccentric pin fixed with one or two auxiliary driving wheels, the central line of the pin is eccentrically arranged with the central line of the lower end of the upper connecting rod or the upper end of the lower connecting rod, one end of the swing rod is connected with the eccentric pin while another end is hinged on the cylinder, the hinge axle is disposed with one or two active driving wheels with controllable rotation, and the active driving wheel is rotationally engaged with the auxiliary driving wheel. The invention can real-time adjust the pressure ratio of the engine to assure the engine works in high thermal efficiency, improve fuel efficiency and reduce pollution.

The invention provides a bionic ligament and a bionic ligament system. The bionic ligament comprises a body part and branch parts, wherein the body part comprises a porous membrane and multiple fiber filaments, the body part is in a cylindrical shape which is formed by winding the porous membrane and provided with a cavity, the fiber filaments are fixed to the porous membrane, and at least one of the fiber filaments extends in the direction approximately same as the length direction of the body part; the branch parts extend out from the two ends in the length direction of the body part, the branch parts are connected with the part body, the free ends, away from the body part, of the branch parts can be bent along the radial outer side, and accordingly the free ends of the branch parts are separated from each other. The bionic ligament can promote new tissue growth, promotes bone-tunnel and bionic ligament three-dimensional fusion, can maintain the balance between mechanical attenuation of the bionic ligament and mechanical progressive increase of a new ligament, and accordingly stable mechanical support is provided.

The invention was involved in a method to recovery blast energy from air blast of blast furnace and rest pressure generators of gas of blast energy. Gas turbo of blast energy from rest pressure generators by clutch was connected with electric motor or steam turbine in air blast of blast furnace and rest pressure generating system in rest pressure generators of gas of blast energy was cancelled. All the above formed the recovery groups. The power was provided by electric motor or steam turbine in air blast of blast furnace and gas turbo of blast energy from rest pressure generators. The structure was compact with small floor space and convenient to layout. Mechanical loss was low and control system was simple with low investment cost. The cost was lower 10%-20% than that of a set of air blast with blast furnace and rest pressure generators of gas of blast energy. And the investment recovery period shorten 1-2 years.

The invention provides a single-roller tire rolling resistance measuring method in a finished-automobile mode. The single-roller tire rolling resistance measuring method comprises the steps of reversely dragging a motor to enable the rotary drum acting force on a driving wheel to be towards the front of an automobile, and adjusting the adjustable motor to stabilize the rotating speed of the automobile driving wheel in a normal running speed range. A three-component-force sensor measures the counter-acting force of a central shaft of a single roller, and then moment calculation is performed to a tire and the single roller at the tire center position, namely the tire rolling resistance can be calculated. The tire rolling resistance measurement is performed in the finished-automobile mode, the tire is not required to be disassembled, the influence of the outside environment and human factors is reduced, and the single-roller tire rolling resistance measuring method in the finished-automobile mode is simple in operation, easy to achieve and high in measurement accuracy.

The invention discloses a low-temperature enrichment and thermal desorption integrated cold trap for trace volatile organic compounds. The cold trap is characterized by comprising a refrigeration system, a gas sample dehumidification system, a cold trap enrichment system and a thermal desorption system. A sample water vapor dehumidification trap and a trapping trap are integrally designed, so thatthe size and the cost are reduced. The cold trap is small in design size, free of refrigerant consumption, capable of continuously working for a long time, capable of being used as a pretreatment device for in-situ continuous monitoring and wide in application range.

The invention discloses a flow guide disk of a multistage impeller centrifugal pump. A disk base of the flow guide disk is divided into an upper cavity and a lower cavity through a middle partition plate. Water-passing through holes communicated with the upper cavity and the lower cavity are evenly and annularly distributed in the periphery of the middle partition plate. Each water-passing through hole corresponds to a flow baffle. The flow baffles are located on the bottom face of the lower cavity. One end of each flow baffle extends to the inner side wall of the lower cavity, and a water inlet opening is formed between the other end of each flow baffle and the adjacent flow baffle. The flow baffles jointly define an impeller containing cavity. Flow guide ribs are evenly and annularly distributed on the bottom face of the upper cavity, and the space between every two adjacent flow guide ribs corresponds to one water-passing through hole. A disk-covering sealing cover is connected to the edge of the opening of the upper cavity. The flow guide disk solves the technical problem that an existing flow guide disk influences the working efficiency of the multistage impeller centrifugal pump; the working efficiency of the multistage impeller centrifugal pump is guaranteed on the premise of achieving normal operation of the multistage impeller centrifugal pump.

A cryogenic air separation system wherein pressure energy is supplied by a bridge machine having one or more booster compressors and a multicomponent refrigerant fluid compressor of a multicomponent refrigerant fluid circuit, all of the compressors of the bridge machine driven by power supplied through a single gear case.

The invention relates to the technical field of energy storage, in particular to a compressed air energy storage system and method.The compressed air energy storage system comprises an air cavity and an inflation and deflation pipe orifice, a piston capable of moving up and down is arranged in the air cavity and divides the air cavity into an upper low-pressure cavity and a lower high-pressure cavity, and the low-pressure cavity is provided with a low-pressure communication opening capable of communicating with the outside. The piston is provided with a high-pressure communicating opening capable of communicating the low-pressure cavity with the high-pressure cavity, the inflation and deflation pipe orifice communicates with the bottom of the high-pressure cavity, and the inflation and deflation pipe orifice is externally connected with a cooling compression device used for inflation and a heating expansion device used for deflation. According to the compressed air energy storage system and method, the problems that in the compressed air energy storage system, the air inlet pressure of the expansion machine is unstable, and throttling losses exist can be solved.

The invention discloses a pressurization system based on free piston expansion / compressor-linear motor. The system mainly consists of four parts, including an excess pressure recycling system, a circuit switching system, a pressurization system and a control system. The pressurization system disclosed by the invention can be used for transforming excess pressure energy in a gas conveying pipeline of a natural gas driven generator set into electric energy and storing the electric energy, simultaneously driving a free piston expansion / compressor to compress air and then respectively supplying the compressed air to a gas charging system of the natural gas driven generator set and a pressure regulation system of the free piston expansion / compressor. In comparison with a current excess pressure driven power generation system which adopts a turbine type machinery as an acting unit, the excess pressure driven power generation system has the advantages of being reliable in work, high in system energy utilization rate and mechanical and electrical integration degree and flexible in regulation on pressure fluctuation of natural gas or pressurized air at the outlet of the expansion / compressor.

The present invention provides a cashew oil modified alkyl phenol-phenol formaldehyde tackifying resin, which is a cardanol and alkyl phenol formaldehyde copolymerized product, wherein the polymer side chain is a long carbon chain having unsaturated double bonds, and the softening point is 100-140 DEG C. The present invention further discloses a preparation method and an application of the cashew oil modified alkyl phenol-phenol formaldehyde tackifying resin, wherein the cashew oil modified alkyl phenol-phenol formaldehyde tackifying resin can be adopted as a rubber tackifier so as to provide good self-adhesion for the rubber material and reduce dynamic heat production of the rubber, and the rubber tackifier is particularly suitable for tire production.

The invention relates to a column type pole distance variable capacity weight-sensor used in electric weight system. It is formed by a weight-bearing head, a moving column, a capacity upper polar plate, a capacity lower polar plate, a weight-bearing spring, an outer cylinder and a bed and so on, wherein the capacity upper and lower polar plate and the weight-bearing spring are sealed fixed inside the outer cylinder. The gravity action of the object in on the weight-bearing head; it presses the weight-bearing spring by moving cylinder so that the condense deformation of the weight-bearing spring makes the distance between the capacity upper and lower polar plates short and the capacity value between the capacity upper and lower polar plate larges. It uses the external capacity testing circuit to measure the capacity value between the capacity upper and lower polar plate to obtain the weight value of the object.

The invention relates to a piston ring which is a seal and oil distribution part of an internal combustion part. After the L-shaped piston ring is applied, the rotation speed of a diesel engine is doubled, and the oil consumption of the diesel engine is reduced by a half; the L-shaped piston ring of the internal combustion engine is composed of a long arm (1) and a short arm (2); the long arm (1) and the short arm (2) are vertical to each other; when the short arm (2) is installed in a piston ring groove, the top of the long arm (1) is level with the top of a piston (4); the L-shaped piston ring of the internal combustion engine is of a split structure, is divided into three sections or four sections in the circumferential direction, and is tightly locked into a combined ring by a spiral spring (3) outside the short arm (2); a gap is arranged between the inner side face of the long arm (1) of the L-shaped piston ring of the internal combustion engine and the piston (4), and the gap is communicated with an air cylinder; the pressure in the air cylinder can be applied to the inner side face of the long arm (1); and when the pressure is applied to the inner face of the long arm (1), each section deflects by taking the spiral spring as a center, and the outer side face of the long arm (1) is pressed towards a cylinder wall (5), thus forming positive pressure.

The invention discloses a wind generating set and a low voltage ride-through protection method of the wind generating set. The wind generating set comprises a set signal tracking system and a power grid signal tracking system, wherein the set signal tracking system is connected to an energy outlet of the wind generating set, the power grid signal tracking system is installed on the high-voltage side of a box-type transformer, and the set signal tracking system and the power grid signal tracking system are connected with a PLC control system. The set signal tracking system is used for collecting power quality information of the outlet of the wind generating set, analyzing the operating state of the wind generating set and feeding back the power quality information and operating state information of the wind generating set to the PLC control system. The power grid signal tracking system is used for collecting power grid signals of the high-voltage side of the box-type transformer, analyzing the operating state of a power grid and feeding back the power grid signals and operating state information of the power grid to the PLC control system. The wind generating set can meet the requirement for power generation in an area where power grid fluctuation is large and also can reduce the fault rate of a wind generator to a large extent.

The invention relates to a slide-rod cycloidal paddle propeller with an adjustable maximum attack angle. The slide-rod cycloidal paddle propeller with the adjustable maximum attack angle is composed of a drive mechanism and an attack angle control mechanism. A gear of a drive motor of the drive mechanism is engaged with a gear of a paddle drive disc, the paddle drive disc is enabled to drive paddles to rotate, and power is provided for the cycloidal paddle propeller. Each paddle shaft is capable of freely rotating in a hole position, connected together with an attack angle control hinge through a slide rod, and used for controlling the attack angles of the paddles at different positions. A control shaft in the attack angle control mechanism changes a phase angle of an attack angle change period of each paddle by controlling a rotation angle of a control disc, and then changes a thrust direction of the paddle. A distance between the axis of the control disc and the control shaft is adjusted by an axial stepper motor, and the maximum attack angle adjustment is realized. The slide-rod cycloidal paddle propeller with the adjustable maximum attack angle has the following beneficial effects: the slide-rod cycloidal paddle propeller with the adjustable maximum attack angle is provided with few specially-shaped members and reasonable in layout, and has the characteristics of being simple and reliable in structure, and convenient to maintain; and the slide-rod cycloidal paddle propeller with the adjustable maximum attack angle is not provided with a friction pair in a working process, has few transmission links, and has the characteristic of being low in mechanical loss.

The present invention discloses one kind of magnetically suspended shuttle device for directly driven circular loom. The magnetically suspended shuttle device includes a frame, tracks, a gate rail ring, an upper gate ring a shuttle, a shuttle separating rod, magnetic heads, magnetic blocks, a guide pulley and a permanent magnet motor. The magnetically suspended shuttle device has simplified structure, less mechanical noise, capacity of improving weaving quality, low power consumption a high efficiency, and is suitable for use in general-purpose circular loom.

The invention discloses a low noise double-body self-priming combination pump. The low noise double-body self-priming combination pump comprises a motor, pump body connecting supports installed at the two ends of a motor shaft, a first pump body and a second pump body. The first pump body is provided with a first inlet and a first outlet, and the second pump body is provided with a second inlet and a second outlet. The motor is located between the two symmetrically installed pump bodies, and the motor shaft stretches out of a motor shell from the two sides of the two ends of the motor to drive the two pump bodies. The single motor is used for driving the two combination pump bodies on the two sides of the motor at the same time to balance radial force at the ends of the motor shaft, and the double-body combination pump which is low in noise, high in machine pump efficiency and excellent in comprehensive work performance such as flow, lift and suction head lift is provided.