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 discloses a flow cytometer liquid flow system and a control method. The system includes a sample liquid channel, a sheath liquid channel, a negative pressure source channel and a flow chamber; the sample liquid channel, the sheath liquid channel, and the negative pressure source channel are all connected to the flow The sheath fluid channel is provided with a position potential energy stabilization device, which includes a sheath fluid container, a sheath fluid buffer device, a first sheath fluid circulation pump, and a second sheath fluid circulation pump; the sheath fluid buffer device has a sheath fluid inlet, two A sheath fluid outlet; the inlet of the first sheath fluid circulating pump is communicated with the sheath fluid container, and its outlet is communicated with the sheath fluid inlet of the sheath fluid buffer device; a sheath fluid outlet of the sheath fluid buffer device is communicated with the flow chamber, and the sheath fluid buffer device One of the sheath liquid outlets is connected with the inlet of the second sheath liquid circulation pump, the outlet of the second sheath liquid circulation pump is connected with the sheath liquid container, and the sheath liquid outlet connected with the second sheath liquid circulation pump in the sheath liquid buffer device is higher than It is connected to the sheath fluid outlet of the flow chamber. The invention precisely controls the sheath fluid and prevents sheath fluid pulsation.

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.

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 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 includes a filter tank and an elastic body; the filter tank has a space in the tank; the elastic body is arranged in the space in the tank; when the space in the tank reaches a certain pressure value, the volume of the elastic body Can be compressed; the top or bottom of the filter tank is provided with an inlet pipeline and an outlet pipeline; the inlet pipeline and the outlet pipeline are respectively communicated with the space inside the tank. The fluid filtering system includes a hydraulic pump and a fluid filter; the liquid outlet of the hydraulic pump communicates with the inlet pipeline of the fluid filter. The purpose of the present invention is to provide a fluid filter and its system to solve the technical problem of high fluid pulsation in the prior art.

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.

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 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 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.