68results about How to "Avoid surge phenomenon" patented technology

The invention discloses an air compressor group control system and method capable of achieving calculation based on the required air consumption, and relates to the technical field of air compressor group control. The system comprises air compressor units, an air distributing cylinder and a controller; an air compressor air outlet of each air compressor unit is connected with a flowmeter, and the flowmeters are used for collecting the air supply flow of an air compressor, the air distributing cylinder is provided with a pressure sensor, and the pressure sensor is used for collecting air supply pressure of the air distributing cylinder; the controller receives the air supply flow collected by the flowmeter of each air compressor unit and air supply pressure collected with the pressure sensor, the received air supply flow and the received air supply pressure are subject to data processing, and according to the processing result, running of air compressors of an air compressor group is adjusted; the method is a calculation method of the controller; the control system and method promote stable and efficient running of the air compressor, and the running and maintaining cost of an air compressor group are reduced.

The invention discloses a device for widening a stable operation area of a centrifugal compressor. The device comprises a plurality of high frequency response dynamic pressure sensors, a high frequency response dynamic strain indicator, signal conditioning equipment, a signal processing digital signal processor (DSP) module, and an air jet device, wherein the dynamic pressure sensors and the dynamic strain indicator acquire dynamic signals of the compressor during operation; the signal conditioning equipment transmits the signals to the DSP module; and the DSP module processes the signals and sends a command to a controller so as to make the air jet device act. The device can widen the stable operation area of the centrifugal compressor, namely a stability working range, and eliminates or reduces the harm of flow instability, namely stall and surge. The invention also discloses a method for widening the stable operation area of the centrifugal compressor, and a centrifugal compressor provided with the device for widening the stable operation area of the centrifugal compressor.

The invention relates to an air compressor air inflow control system and a control method thereof. The air compressor air inflow control system comprises an air inflow valve, a stopping air release valve, a circulation unloading valve, a pressure adjusting valve, a loading / unloading solenoid valve, a high / low pressure switching solenoid valve, a one-way valve, an adjustable throttling valve, a filter and a throttle valve. According to the air inlet control scheme, underloading staring of an air compressor can be achieved, low-pressure internal circulation of the air compressor system in the unloading state is maintained, two-gear system working pressure is achieved, starting difficulties of the air compressor can be overcome through the functions, energy-saving operation of the air compressor in the unloading state is guaranteed, and the high / low pressure working pressure of the system can be set according to operation requirements of clients.

An air compressor anti-surge generalized predictive control system and method relate to the field of anti-surge predictive control of air compressor control systems in the steel and chemical industries. The system includes a forward collector, a predictor and a backward actuator. The forward collector monitors the inlet and outlet pressure and flow of the pipe network, and is connected to the predictor in the form of PCI bus; the backward actuator controls the vent valve, has the function of sound and light alarm, and is connected to the predictor in the form of RS485; the predictor The controller adopts the air compressor anti-surge generalized predictive control method, combines the production load setting information input by the keyboard and the on-site operation data obtained by the forward collector, calculates, displays and stores the air compressor operating parameters, and uses the RS485 method to backward The actuator outputs predictive control information to realize predictive control of air compressor anti-surge. The system adjustment process of the invention is gentle, the control precision and dynamic quality are high, the operation is stable and reliable, and the surge phenomenon of the air compressor can be effectively prevented.

The invention relates to the technical field of turbocharging, and discloses a turbocharging method and device, supercharging control equipment and a storage medium. The turbocharging method comprisesthe steps that the current pressure and current temperature of a pre-arranged intake manifold are collected; the current air intake is determined according to the current pressure and the current temperature; the current air intake is compared with preset surging flow; and when the current air intake is larger than the preset surging flow, an opening degree adjusting instruction is generated, thecurrent opening degree of a pre-arranged waste gas bypass valve is adjusted to a first preset opening degree according to the opening degree adjusting instruction for surging preventing adjustment ofturbocharging. Obviously, use of a boost pressure control valve is omitted, the opening degree of the pre-arranged waste gas bypass valve is controlled through the comparison result obtained by comparing the current air intake and the preset surging flow to protect a turbocharger, and it can be avoided that the turbocharger fails after fiercely surging; and therefore the technical problem that surging preventing control over the turbocharger cannot be efficiently carried out is solved.

The invention relates to an air blower variable-frequency control device based on a power frequency motor and a control method for the air blower variable-frequency control device. The air blower variable-frequency control device comprises the power frequency motor, a frequency converter, a controller and a communication assembly, wherein the frequency converter and the power frequency motor are connected by virtue of an electric wire, and the controller is in control connection with the frequency converter by virtue of the communication assembly; the controller comprises a storage unit, a comparison unit, an alarm unit, a PLC (programmable logic controller) control unit and a detecting unit; an electric reactor is further arranged between the frequency converter and the power frequency motor; the detecting unit is connected to the power frequency motor, and is used for feeding back a detected actually-measured frequency value and an actually-measured current value of the power frequency motor, and an outlet total air flow value of the air blower to the comparison unit. The air blower variable-frequency control device has the advantages of being simple in structure, reasonable in design, high in degree of automation, and capable of effectively reducing a calorific value of a frequency converter motor to achieve the purpose of automatically regulating to realize energy saving; and by reasonably controlling and regulating the frequency of the frequency converter, and the occurrence of a surging phenomenon of the air blower due to energy waste or too low frequency caused by too high frequency is avoided.

The invention discloses a stability expansion control method for an ultrahigh-speed electric air compressor of a hydrogen-oxygen fuel cell automobile, and the stability expansion control method comprises the following steps: S1, obtaining an air inlet pressure value of required air according to the current working condition of the automobile, and recording the air inlet pressure value of the required air as a first pressure value; S2, acquiring an air pressure value of the current net pipe and an outlet pressure value of a secondary air compressor; regarding the air pressure value of the net pipe as a second pressure value, and recording the outlet pressure value of the second-stage air compressor as a third pressure value; and S3, judging the relation among the first pressure value, the second pressure value and the third pressure value, and controlling the electric air compressor according to the relation. The stability of the high-speed electric air compressor during high-speed rotation can be guaranteed.

Provided in the invention is an anti-surge system for turbocharging. The system comprises a turbocharging device, a first air inlet pipe, a flow mixing device, a first air outlet pipe, a second air outlet pipe, a heat exchange device, a flow divider, and a second air inlet pipe. To be specific, the turbocharging device has a turbine motor and a compressor, wherein the turbine motor and the compressor are mutually connected. One end of the first air outlet pipe is connected with an air outlet of an internal combustion engine. The flow mixing device is connected with the other end of the first air inlet pipe and is connected with the turbine motor of the turbocharging device. One end of the first air outlet pipe is connected with the compressor of the turbocharging device and the other end is connected with an air inlet of the internal combustion engine. One end of the second air outlet pipe is connected with the compressor of the turbocharging device. The heat exchange device carries out heat exchanged with the internal combustion engine. The flow divider has an inlet and an outlet; the inlet is connected with the other end of the second air outlet pipe; and the outlet is connected with the heat exchange device. One end of the second air inlet pipe is connected with the heat exchange device and the other end is connected with the flow mixing device. According to the invention, with the system, the surge phenomenon of the turbocharging device can be avoided; and the gas kinetic force at the air inlet end of the turbine motor of the turbocharging device can be utilized to the greatest extent.

The invention provides a structure and method for reducing the surge phenomenon of a centrifugal compressor and automatically adjusting the flow. Performance testing of the structure for reducing thesurge phenomenon of the centrifugal compressor and automatically adjusting the flow is carried out, a surge control line function is calculated, a surge line, a retardation line and a surge control line in the function divide a working condition area of the centrifugal compressor into a surge area, a normal working condition area and a retardation area, when a display screen in a controller displays the that the relation between the temperature and the exhaust pipe flow, the relation between the vibration frequency and the exhaust pipe flow and the relation between a suction inlet and the exhaust pipe flow are all in the normal working area, a computer does not give any instruction to a PLC, and the centrifugal compressor works normally; and when the relation area between any one of the temperature, the vibration frequency and the suction inlet flow and the exhaust pipe flow is not in the normal working area any more, an electromagnetic valve is adjusted by the controller. The surge phenomenon caused by adjustment errors due to instability of one factor is avoided.

The invention relates to a blower comprising a high-speed permanent-magnet machine and a blower body, wherein the rotor of the high-speed permanent-magnet machine is fixedly connected with the impeller of the blower body; the rotor of the high-speed permanent-magnet machine and the impeller of the blower body can rotate synchronously; the impeller is arranged in the housing of the blower body; large blades and small blades are mounted on the impeller alternately; the housing of the blower body is connected with that of the high-speed permanent-magnet machine; an annular air cavity is formed in the housing of the blower body; an inlet duct communicated with the annular air cavity is arranged on the housing of the high-speed permanent-magnet machine; the housing of the blower body takes the shape of a volute; a swirl-shaped air passage is arranged in the housing of the blower body; one side of the swirl-shaped air passage is communicated with the annular air cavity; and the other side of the swirl-shaped air passage is communicated with a gassing bent pipe. The blower provided by the invention has the advantages that the reliability of the rotor is high; the mounting and the processing are simple; the size is small; the efficiency is high; the starting current is small; and the wind volume adjusting is convenient.