60results about How to "Eliminate pulsation" patented technology

The invention relates to an energy transfer type power battery quick balancing system and a control method thereof. The invention relates to the battery voltage balancing system and further relates to the control method of battery pack quick balancing process, which solves the problem that a balanced battery single body and an energy storing element are impacted through pulse current by a currentbalancer in the prior art. The system comprises a power battery pack single body battery voltage and flying capacitor voltage detecting network, a current sensor and a signal modulating circuit, a single chip microcomputer, an electric power transfer channel, a first filter circuit, a two-way buck-boost converter, a second filter circuit and a flying capacitor. After starting to work, the system firstly detects the battery pack single body battery voltage, the flying capacitor voltage and the charging / discharging current; and if the dropout voltage between the highest voltage of the battery single body and the lowest voltage of the single body exceeds a set value, the balancing operation is started.

A limb compression device to which a cuff unit wound around a limb of a patient is connected controls compression and release of the limb by controlling air supply and exhaust of the cuff unit to repeat an compression period and a reperfusion period a predetermined number of times. At the start of the compression period, pressurization using the cuff unit is performed up to a compression pressure value based on a systolic blood pressure of the patient measured by detection of pulsation. During the compression period, the device repeats depressurization of the cuff unit at a low rate until pulsation is detected and pressurization of the cuff unit after the depressurization so as to eliminate pulsation.

A catalytic hydrocracking reactor vessel for the conversion of a hydrogen gas and fossil fuel feedstream to light liquid hydrocarbons. The reactor vessel comprises reactor cup riser means with a helical cyclonic separator conduit for separating a liquid and vapor product stream to provide an essentially vapor-free liquid recycle stream, grid plate bubble cap means with tapered bell cap wall housing having serrated edges for producing small hydrogen bubbles of increased total surface area of bubbles at lower pressure drop, optionally feedstream inlet pipe sparger means containing rows of downward directed slots for even distribution of the feedstream across the cross-sectional area of the reactor and providing free drain of solid particles from the sparger, and optionally liquid recycle inlet distributor means containing vertically curved plates for creating a whirling motion in the liquid recycle stream for better mixing with the feedstream with minimal solids settling.

The invention relates to a vertical roller mill hydraulic system, which comprises a plurality of grinding roll clamping hydraulic cylinders, a plurality of accumulator groups, a hydraulic station and connecting pipelines among the grinding roll clamping hydraulic cylinders, the accumulator groups and the hydraulic station, wherein the hydraulic station comprises an oil tank device, an oil pump device, a grinding roll clamping control valve group and connecting pipelines among the oil tank device, the oil pump device and the grinding roll clamping control valve group; a feedline of the oil pump device is connected with an inlet of the grinding roll clamping control valve group; an oil pump motor supplies oil for the grinding roll clamping control valve group; an outlet of the grinding roll clamping control valve group is connected with piston rod cavities of the grinding roll clamping hydraulic cylinders and the accumulator groups; rodless cavities of the grinding roll clamping hydraulic cylinders are connected with the grinding roll clamping control valve group through a plurality of oil return pipes; the grinding roll clamping control valve group controls the telescoping of piston rods of the grinding roll clamping hydraulic cylinders through a plurality of electromagnetic directional valves; and the accumulator groups absorb the vibration of the grinding roll clamping hydraulic cylinders respectively. The vertical roller mill hydraulic system solves the problem of loaded pressure boost of the system and improves the service life of grinding rolls and grinding discs and the maintenance efficiency.

The invention discloses a fluid flow system of a flow cytometry and a control method. The fluid flow system comprises a sample fluid passage, a sheath fluid passage, a negative pressure source passageand a flowing chamber, wherein the sample fluid passage, the sheath fluid passage and the negative pressure source passage are respectively connected with the flowing chamber; the sheath fluid passage is provided with a position potential energy stabilizing device; the position potential energy stabilizing device comprises a sheath fluid container, a sheath fluid buffer device, a first sheath fluid circulating pump and a second sheath fluid circulating pump; the sheath fluid buffer device is provided with a sheath fluid inlet and two sheath fluid outlets; an inlet of the first sheath fluid circulating pump is communicated with the sheath fluid container, and an outlet of the first sheath fluid circulating pump is communicated with the sheath fluid inlet of the sheath fluid buffer device;one sheath fluid outlet of the sheath fluid buffer device is communicated with the flowing chamber, one sheath fluid outlet of the sheath fluid buffer device is communicated with an inlet of a secondsheath fluid circulating pump, and an outlet of the second sheath fluid circulating pump is communicated with the sheath fluid container; the sheath fluid outlet connected with the second sheath fluidcirculating pump in the sheath fluid buffer device is higher than the sheath fluid outlet connected with the flowing chamber. The fluid flow system has the advantages that the sheath fluid is precisely controlled, and the pulsation of the sheath fluid is prohibited.

The invention discloses a method for reducing the torque ripple of a five-phase embedded permanent magnet motor. According to the invention, a stator magnetomotive force model is established. An equivalent magnetic circuit diagram of the motor is extracted, and an odd harmonic part in the rotor magnetomotive force is converted into an even harmonic part according to the interaction principle between the stator magnetomotive force and the rotor magnetomotive force of the motor. In this way, the permanent magnet torque ripple is reduced. Meanwhile, an optimal extreme arc coefficient ratio underthe condition of an asymmetric magnetic pole structure is solved. On the basis of the asymmetric magnetic pole structure, the repeated units of a permanent magnet magnetic pole are determined. The angle of one-time offset is calculated, and a proper offset method is selected for carrying out the magnetic pole deviation. The performances of the reluctance torque and the cogging torque are reduced.According to the invention, the equivalent magnetic circuit method is used for analyzing and calculating an optimal extreme arc coefficient. Not only the optimal permanent magnet torque performance isobtained, but also the design period is shortened. By adopting the magnetic pole offset method, the pulsation of the output torque of the embedded motor is further reduced.

A movable plate 8 is partitioned by a slim hole 23 into a narrow-width part 21 and a wide-width part 22. When a contact is closed as a thermal switch 10, the narrow-width part 21 produces heat with an applied current branched via a first terminal 3 and a second terminal 4, which short-circuits both ends of the current limit resistor, and the heat of a bimetal 9 is retained with a small amount of local heat to self-hold the non-restoration state, so that the current limit resistor is quickly cooled down. When the power supply switch is turned off, the heat produced by the narrow-width part 21 is quickly cooled down to restore the thermal switch 10 in a short time. Also when the power supply is again turned on in a short time, the current limit resistor is made to function efficiently.

The present invention provides a kind of rotor and a motor with the rotor. The rotor comprises a shaft, a magnetic yoke of rotor, several primary permanent magnet groups and several secondary permanent magnet groups. The said several primary permanent magnet groups and the said several secondary permanent magnet groups are alternatively distributed along the circumference of the said magnetic yoke of rotor at the same interval. The projection of the said primary permanent magnet group and that of the said secondary permanent magnet group on a plane vertical to the said shaft are adjacent, and their edges overlap. The present invention can reduce torque pulsation caused by the electromagnetic factors, and increase the external work of torque. Therefore, it has good effects on improving power efficiency of the motor and saving energy.

Provided is a power source switching circuit for a multistage aerospace craft. Aiming at the problems existing in single-battery and double-battery power supply of an electric steering engine system, an electric steering engine system control electricity and power electricity supply switching circuit scheme is provided, and the circuit is mainly composed of a filter circuit, an electricity switching circuit, an input regulating circuit and a selective output circuit. According to the operating principle, when the electric steering engine system does not receive a craft stage separation command voltage FL, electric steering engine system control electricity +28V is provided by a craft control battery EJ28; after the electric steering engine system receives the craft stage separation command voltage FL, the electric steering engine system control electricity is provided by the craft control battery EJ28 and a steering engine battery YJ28 together; after electric switching is completed, AND-operation is carried out on a trigger signal and an output signal of the input regulating circuit, and a result is output to a craft control system; after stage separation, the electric steering engine system control electricity and power electricity on the separation part are both provided by the steering engine battery YJ28.

The invention provides air quality detection equipment and method. The air quality detection equipment comprises a dust particle concentration measuring module, a pollution gas concentration measuringmodule and an air driving module, wherein the dust particle concentration measuring module is used for measuring and sampling dust with different grain diameters respectively; the pollution gas concentration measuring module is serially connected with the dust particle concentration measuring module, and is used for carrying out synchronous sampling on the concentration of pollution gas; the airdriving module is used for driving air to flow through the dust particle concentration measuring module and the pollution gas concentration measuring module. Synchronous and accurate sampling and accurate measurement for dust particles and pollution gas are realized by setting the dust particle concentration measuring module and the pollution gas concentration measuring module; the sampling speedand measurement response speed of pollution gas are improved by setting the air driving module; the dust particle concentration measuring module and the pollution gas concentration measuring module are serially connected in the flowing direction of air, to fulfill the purpose of synchronous sampling, so that the integration of equipment is improved, and the equipment size and processing difficultyare reduced.

The invention discloses a hydraulic system energy accumulator station and a nitrogen filling method using the same. When pressure of the hydraulic system rises, oil liquid enters the energy accumulator, the nitrogen is compressed to be stored in to a nitrogen storage tank; and when the pressure of the hydraulic system declines, the nitrogen enters a piston type energy accumulator from a nitrogen storage tank, the oil liquid is pressed into a loop to release energy. The piston type energy accumulator has a high capacity, sensitive response, small inertia in movement part, long service life, light weight, easy installation, simple structure and convenient maintenance; the piston type energy accumulator is used as a gas pressurization cylinder to fill the nitrogen storage tank with the nitrogen; energy transfer is achieved between incompatible liquid and gas; and the piston type energy accumulator can be used as emergency power source and has functions of leakage supplementary, constant pressure keeping, hydraulic shock absorbing, pulsation absorbing and noise reducing. No additional nitrogen filling device is required; the nitrogen is stable, so that hazards fire, explosion and otherrisks are avoided; and safety and reliability are achieved and efficiency of the hydraulic system id improved.

The invention discloses a device for coal powder injection of a blast furnace, and relates to the technical field of blast furnace ironmaking. The device comprises a first nitrogen pipeline, a secondnitrogen pipeline, a first adjusting valve and a pneumatic ball valve, wherein the first nitrogen pipeline is arranged on a first position of the bottom of an injection tank, the second nitrogen pipeline is arranged on a second position of the bottom of the injection tank, and the first position is different from the second position; and the first adjusting valve is arranged on the first nitrogenpipeline, the first adjusting valve adjusts the gas flow rate of the first nitrogen pipeline to the injection tank, the pneumatic ball valve is arranged on the first nitrogen pipeline, the pneumatic ball valve adjusts the gas flow rate of the first nitrogen pipeline to the injection tank. Through the device for coal powder injection of the blast furnace, the technical problem that a pulsation phenomenon of coal powder injection is severe through a lower coal producing and injection mode is solved, and the technical effects that the pulsation phenomenon of coal powder injection is eliminated, so that coal powder conveying is evener, the blast furnace operates stably and smoothly, and the cost is reduced are achieved.

The invention relates to a gas-assisted layered deep fertilizing machine and a using method. The gas-assisted layered deep fertilizing machine comprises a rack, furrow openers, layered deep fertilizing devices and a gas-assisted fertilizer discharging device, wherein the furrow openers, the layered deep fertilizing devices and the gas-assisted fertilizer discharging device are installed on the rack; each layered deep fertilizing device comprises a material discharging device, a cylinder fixedly connected with the rack and a fertilizer discharging auger installed in the cylinder, a closed passage is formed between each fertilizer discharging auger and the corresponding cylinder, a discharging port of each closed passage is communicated with at least two fertilizer discharging pipes, and thedischarging end of each fertilizer discharging pipe faces backwards and is located behind the furrow openers. By means of the gas-assisted layered deep fertilizing machine, fertilizer granules fall into the soil which is crushed by the furrow openers and then restored, the layered deep fertilizing precision is effectively improved, and the layering failure caused when the fertilizer granules fallto the bottoms of furrows is avoided; the fertilizer discharging augers adopt fixed-screw-pitch and variable-radius design so that the fertilizer granules can achieve spiral downward acceleration with the assistance of gas pressure, the initial speed of discharging the fertilizer granules is increased, and meanwhile the fertilizer granules are blended in the acceleration process and discharged more uniformly.

The invention discloses a broadband gas-liquid two-phase spring pulsation damper which comprises parts including an inlet end communication body, a sealing ring, a buffer cap, a body, a rubber spring or corrugated pipe spring, a flow passing net barrel, an outlet end communication body and the like. According to pulsatile fluid flowing through the inlet end of the broadband gas-liquid two-phase spring pulsation damper, fluid peak value kinetic energy is transmitted to the rubber spring or corrugated pipe spring in the body through end flanges of the buffer cap and the flow passing net barrel, and the rubber spring or corrugated pipe spring generates elastic deformation to absorb pulsation kinetic energy; and when a fluid peak value comes, the rubber spring or corrugated pipe spring releases stored energy and recover deformation. Through circulated reciprocation of the above process, fluid pressure pulsation is restrained. The broadband gas-liquid two-phase spring pulsation damper is suitable for fluid pulsation eliminating of liquid flow and gas flow within the 0-80Hz pulsation frequency range. The broadband gas-liquid two-phase spring pulsation damper has the obvious effects of being simple in device structure, small in size, light and high in bearing pressure compared with a traditional damper, and the pulsation eliminating rate is 95% or above.

The invention relates to the technical field of fluid filtering, in particular to a fluid filter and a system thereof. The fluid filter comprises a filter tank and an elastic body. The filter tank isprovided with an in-tank space. The elastic body is arranged in the in-tank space. When the in-tank space reaches a certain pressure value, the volume of the elastic body can be compressed. An inlet pipeline and a flowing-out pipeline are arranged on the top or the bottom of the filter tank and communicate with the in-tank space. The system of the fluid filter comprises a hydraulic pump and the fluid filter. The liquid outlet end of the hydraulic pump communicates with the inlet pipeline of the fluid filter. According to the purposes, the fluid filter and the system of the fluid filter are provided, and the technical problem that the fluid pulse is high in the prior art is solved.

The invention relates to a method for realizing fixed-amount conveying of material and a special low-impulse rotor pump. The method is that: material is continuously supplied to a material carrying section (15) through a material inlet (26); then a servo motor drives a left rotor (8) and a right motor (9) to rotate; the material enters the material carrying section between two adjacent gears of the rotors (8, 9); the rotors (8) and (9) are meshed with each other in a rotating way, the material is pushed to a material outlet (16) to be discharged. The special low-impulse rotor pump comprises a pump body (11) and a pump cover (10) pressed above the pump body (11); the rotors (8) and (9) are corresponding to each other; gears on the surface is spiral rotor pair . By adopting the technical proposal, the rotor pump can effectively reduce discharge impulse with low cost and simple structure.

The invention belongs to the technical field of power control systems for engineering machinery, and discloses a quick response power system for the engineering machinery. The quick response power system comprises an executing mechanism and a power quick response unit; the executing mechanism is composed of an oil cylinder, a work hydraulic pump, three three-position four-way reversing valves and three hydraulic cylinders; the power quick response unit is composed of an energy accumulator, a first solenoid reversing valve, a safety valve, a second solenoid reversing valve, an oil cylinder, a one-way valve, a power hydraulic pump, an electromotor, a motor frequency converter, a control unit and a pressure sensor. According to the invention, the rotation speed of the hydraulic pumps can be timely, quickly and efficiently regulated according to the specific change conditions of the pressure of hydraulic components, the energy utilization rate can be increased, and the rated power provided by a hydraulic machinery power system, namely the rated power of the electromotor can be lowered.

An expansion joint spring clip can eliminate flutter, pulsations and reverse bending on non-metallic fabric flue duct expansion joints. The expansion joint spring clip can hold the expansion joint in a fixed arch such that it can still perform its function with regard to accommodating the ducting system movements. The expansion joint spring clip allows the entire width of the non-metallic expansion joint to retain its position during start-ups, downloading and during full or partial boiler, kiln, furnace loads and the like. The expansion joint spring clip can be installed in the existing geometry of an expansion joint by producing an arch while not damaging the expansion joint after being installed. The expansion joint can still accommodate axial and limited lateral movements, allowing the expansion joint to perform its function.

The invention discloses an aircraft hydraulic oil pump ground-drive testing equipment which is characterized by comprising a hydraulic motor (1), an elastic coupler (2) and a drive hydraulic pump (3).The drive hydraulic pump (3) is connected with the hydraulic motor (1) through the elastic coupler (2) and is horizontally and slidably connected onto a first base (4) through a screw rod structure;the first base (4) is longitudinally and slidably connected onto a second base (5) through a screw rod structure; and a dip angle adjusting structure and a height adjusting structure arranged on the bottom part of the second base (5). The aircraft hydraulic oil pump ground-drive testing equipment has the advantages of reasonable arrangement, coordination work, high comprehensive performance, highautomation degree, high reliability, low noise, and easiness in operation and maintenance.

An apparatus for preventing noise from occurring due to cavitation in a power steering pump during low temperature start-up includes the addition of a multi-passage orifice element for adding wetted surface resistance to high viscous fluid flow downstream from a single passage outlet orifice element of a fluid flow control device and upstream of an associated steering gear or steering assist valve.

The invention relates to a pulseless connecting rod type continuously variable transmission which comprises a hollow shell. A power input shaft capable of rotating around the axis of itself and a power output shaft capable of rotating around the axis of itself are arranged in the shell in parallel. One end of each shaft stretches out of the shell. A support is arranged in the shell and provided with a connecting body, and the connecting body is driven by the power input shaft to rotate. The two ends of the connecting body are fixedly connected with diameter adjusting wheels respectively. Sliding grooves formed in the radial direction of the diameter adjusting wheels are processed in the diameter adjusting wheels. The sliding groove in one diameter adjusting wheel is perpendicular to the sliding groove in the other diameter adjusting wheel. A diameter adjusting mechanism is arranged in the connecting body and used for driving power transmission mechanisms. According to the continuously variable transmission, the pulsation phenomenon is thoroughly eliminated, it is guaranteed that the continuously variable transmission works stably and reliably, and pausing is prevented from happening during vehicle running. Meanwhile, steel cables wound on backstops are adopted as connecting transmission pieces, the phenomenon of slipping in the high-speed rotating process is avoided, and the stability of the transmission is further improved.

The invention discloses a flow pressure stabilizing device which comprises a container and a liquid inlet pipe, wherein the container has a cavity arranged along the vertical direction, and a liquid outlet connected to the cavity and the external is formed in the container; the liquid inlet pipe comprises a pipe body which is parallel to the arrangement direction of the cavity, and the top opening of the pipe body extends toward the top direction of the cavity. A flow pressure stabilizing method is also disclosed. Working principle that the air is compressible and the liquid is incompressible is adopted for innovation, mutual action between the liquid and the compressed air is used for effectively eliminating the pulsation in the liquid, and the pressure, flow fluctuation and bubbles problems of the liquid transferring process can be solved.

A top cover for a closed compressor comprises a top board and a cover board. A hole on the top board is linked to the outlet of the compress chamber; the two ends of the hole are jointed with the first and the second mufflers. A concave convex joint part is fixed on the cover board to form a channel for liquid flowing from the outlet hole and the mufflers. The two mufflers are posited to the two ends of the top cover and form the channel with the concave convex joint part. The design prolongs outlet way of liquid so to minimize noise and pulsation.

The invention discloses a secondary mixer for coal spraying with a blast furnace. The secondary mixer comprises a total pipeline for coal spraying, a connecting piece of double pipelines of coal gas, gas supply pipes, a capacity control valve of the gas supply pipe, mixer cores, a variable diameter pipe and the like. The gas supply pipe which is leaded on a nitrogen pipeline of an aeration valve of the total pipeline for coal spraying is arranged along the total pipeline for coal spraying to the connecting piece of double pipelines of coal gas for connecting with the secondary mixer, so a phenomenon of uneven mixing of coal and the gas in the total pipeline for coal spraying can be effectively eliminated, a pulsation phenomenon in the coal dust spraying can be eliminated, the obstruction frequency of a spray gun is reduced, and the even blowing of a dense phase is realized.

The invention relates to a guide float valve, which comprises: an ellipses valve cover whose short axle has spindle guide plate bended at two sides, and long axle has one ellipses liquid plate at one end, wherein the lower end of liquid plate has one valve stop pin; another end of said long axle has a vertical bended valve leg; the lower end of said leg has another valve stop pin; the valve leg has a ventilate hole; the valve cover has a guide small float valve; the liquid plate can completely block the airflow reversed to the liquid, and via using liquid plate and guide small float valve to guide the gas, the gas will be guided out, and the convective overshooting between valves can be avoided, to reduce the liquid gradient and reduce the energy consumption.

The invention discloses a fracturing pump driven by linear motors. The fracturing pump driven by linear motors comprises one or more fluid ends, wherein a plurality of plungers are arranged on each fluid end side by side, each plunger is correspondingly connected with one linear motor, and each linear motor drives the corresponding plunger to do reciprocating rectilinear motion; and each fluid endis also provided with a plurality of control valves, and the control valves are used for controlling sucking or draining of liquid during motion of the plungers. Each linear motor is directly connected with the corresponding plunger, each linear motor drives the corresponding plunger to do reciprocating rectilinear motion, and components of crankshaft-connecting rod mechanisms and the like in a conventional fracturing pump are omitted, so that the structure of the fracturing pump is simplified, and the reliability and the transmission efficiency of the fracturing pump are effectively improved. Besides, the linear motors operate smoothly and are constant in speed, and output flow and pulsation of pressure are theoretically and basically eliminated; besides, the stroke of the linear motorscan be long, so that requirements for low strokes per minute and large displacement are met, and vibration of the whole pump and consumption of wearing parts of the fluid ends are reduced.

Electric motors are disclosed with coils which induce a magnetic flux field which by its relationship with ferromagnetic poles provide the motoring force without use of an auxiliary magnetic field. The motors may be employed with fixed or pivotably mounted brushes. Pivotable brushes for electric motor brushes are disclosed.

The invention provides a pulsation damper, which comprises a shell, wherein a liquid inlet and a liquid outlet are formed on the two sides of the shell respectively; a gas cavity is formed in the shell; the side wall of the gas cavity is formed by a telescopic film; the top surface and the bottom surface of the gas cavity are formed by a diaphragm and the bottom surface of the shell; one end of the telescopic film is fixed on the bottom surface of the shell, and the other end of the telescopic film is fixedly connected with the diaphragm; a central shaft and a central shaft sleeve are arranged in the gas cavity; the bottom surface of the central shaft sleeve is fixed on the bottom surface of the shell; an opening is formed on the top surface of the central shaft sleeve; the central shaft passes through the opening on the top surface of the central shaft sleeve; the first end of the central shaft is connected with the diaphragm, and the second end of the central shaft is positioned in the central shaft sleeve; a limiting tail end is arranged at the second end of the central shaft; the width of the limiting tail end is greater than the space of the opening on the top surface of the central shaft sleeve; and a gas inlet is formed on the bottom surface of the gas cavity and is used for introducing compressed gas into the gas cavity. The pulsation damper has a simple structure, hassmaller volume compared with other kinds of pulsation dampers and has an extremely good smooth pulsation effect.