258 results about "Surge control" patented technology

A post-occlusion surge controller 90 for a phacoemulsification machine 30 is adapted to detect a post-occlusion surge in an aspiration conduit 41 of the machine 30, and to cause the conduit 41 to be vented in response to detecting the surge.

A valve includes a body; a liquid flow passage defined in the body and including a liquid inlet and a liquid outlet; a vent passage defined in the body and including an air inlet and an air outlet; a valve seat defined in the liquid flow passage; a liquid seal located adjacent the valve seat; a stem connected to the liquid seal and extending in the liquid flow passage away from the liquid seal through an aperture defined in the body. The stem includes a distal end located external to the body. The stem is movable to and from a first position where the liquid seal is mated with the valve seat and a second position where the liquid seal is unseated from the valve seat. An actuator is connected to the distal end of the stem. The actuator is selectively movable to move the stem from the first position to the second position. A check-valve is adapted to block flow of liquid from the air outlet to the air inlet in the vent passage, and to allow flow of air from the air inlet to the air outlet in said vent passage. The valve optionally further includes a surge control device and / or a keeper for the check-valve seal.

The present invention generally relates to a system for preventing surges in turbine engines and / or rotating compressors. Furthermore, some embodiments comprise sensors for monitoring engine operating characteristics and detecting surge and pre-surge conditions. Some embodiments also include means for adjusting engine operation in response to sensor data. Still other embodiments relate to methods of preventing surges in turbine engines and / or rotating compressors.

Methods and systems are provided for using compressor recirculation flow via a venturi to enhance low pressure EGR flow. The opening of a compressor recirculation valve can be adjusted based on EGR flow demand to recirculate cooled compressed air through a venturi while generating vacuum for drawing EGR. The approach allows for concurrent EGR control and surge control.

Methods and systems are provided for using compressor recirculation flow via a venturi to enhance low pressure EGR flow. The opening of a compressor recirculation valve can be adjusted based on EGR flow demand to recirculate cooled compressed air through a venturi while generating vacuum for drawing EGR. The approach allows for concurrent EGR control and surge control.

Methods and systems are provided for recirculating compressed air across a compressor through a high flow and a low flow compressor recirculation path. Flow through the recirculation paths is controlled via respective valves and valve opening is adjusted based on a throttle mass flow so as to maintain a compressor flow rate at or above a surge constrained flow rate. By maintaining a sufficiently high compressor flow rate during steady state and transient conditions, the compressor state can be maintained outside a surge region.

A compressed air system includes a compressor having an inlet and an outlet. A duct fluidly connects the outlet to the inlet and has a valve arranged in the duct. A controller communicates with the valve and commands the valve to move between first and second positions in response to a surge condition and / or an add-heat condition to regulate an amount of fluid flowing through the duct. The valve opens to provide hot air from the compressor outlet to deice the inlet or to provide the higher pressure compressor outlet air to the lower pressure compressor inlet air to obtain a pressure ratio in a desired range. The inventive compressed air unit is designed to provide a compact arrangement so that the valve providing the heated, pressurized air to the inlet is located in close proximity to the inlet for a rapid response time. The duct comprises a relatively short length of tubing interconnecting an add-heat supply outlet and an add-heat plenum inlet, which are provided by a housing of the compressor. The housing also includes an add-heat plenum having an annular wall arranged at the inlet to provide an annular cavity. Hot air from the compressor outlet is provided to the plenum to heat the annular wall quickly at the inlet to prevent deicing.

Apparatus and method for controlling pressure surges in a wellbore. One embodiment provides a downhole surge control tool equipped with a fluid motivator. The fluid motivator may be, for example, any type of motor or a venturi. The fluid motivator motivates wellbore fluid through a bypass channel formed in the tool and then out an exhaust port of the tool.

A valve assembly includes a nitrogen enriched airflow control valve, a first stage surge control valve and a second stage surge control valve respectively arranged in a passage downstream of an air separation module, and in first and second surge control passages. The valves are in a ganged relationship or connected to one another such they move with one another in response to an input from a common actuator. The surge control valves open as the nitrogen enriched airflow control valve is moved to provide a smaller area.

A compressor active surge control system that includes an air recirculation line that has a first end connected downstream of a compressor outlet and a second end connected upstream of a compressor inlet. The gas recirculation line recirculates compressed air from the compressor outlet to the compressor inlet. Also included in the system is a mixer positioned to receive both ambient air and recirculated air. Mixing of the air homogenizes the air prior to its introduction into the compressor. An air cooler may be included that cools the recirculated air prior to its introduction into the compressor. Cooling and mixing of the recirculated air expands the operating range of the compressor by reducing the incidence of surge. Various existing components, such as intercoolers and filters, may serve the additional duty of cooling or mixing the recirculated air.

The proposed mechanical method of turbocompressor surge detection uses vibration signals from vibration monitoring equipment mounted on the compressor components to detect a surge event and provide antisurge control thereby. This method utilizes only mechanical information to identify surge, as compared to present day antisurge controllers that use compressor thermodynamic information such as flow, pressure, and temperature to locate a compressor's operating point on a compressor map compared to a surge region.

A fan system for a variable air volume heating and / or air conditioning unit comprising a fan array with a control system to eliminate surge at low operating flows and to maximize operating range. The fan control system includes a fan pressure sensor for determining the pressure rise across the fan array and a fan airflow sensor for determining the total airflow generated by the fan array. A surge controller is programmed to constantly monitor the calculated surge pressure as the fan speed control is modulating the fan speed in response to user demands. As airflow increases or decreases in response to changes in fan speed, so will the calculated surge pressure. The surge control turn fans on and off to ensure that the operating fans are running in their optimum fan speed ranges. Thus, the fans in the fan array are prevented from reaching the surge point.

A valve assembly includes a nitrogen enriched airflow control valve, a first stage surge control valve and a second stage surge control valve respectively arranged in a passage downstream of an air separation module, and in first and second surge control passages. The valves are in a ganged relationship or connected to one another such they move with one another in response to an input from a common actuator. The surge control valves open as the nitrogen enriched airflow control valve is moved to provide a smaller area.

A two-stage radial compressor having a ported second-stage shroud, forming a passive surge control system. Thus, some proportion of the fluid is allowed to flow between the second-stage of the compressor in the vicinity of the impeller blade tips, through a port in the shroud into an upstream portion of the compressor flow path that leads into the second-stage impeller inlet. The fluid is allowed to flow in either direction, depending on the pressure difference existing between the two locations. Surge margin at higher pressure ratios is significantly increased by the ported second-stage shroud.

The invention discloses a device for controlling anti-surging of a blast blower, which comprises a sensor module, a standard flow conversion module, a dynamic anti-surging control module, an anti-surging adjuster and an execution mechanism. The invention also discloses a method for controlling the anti-surging, which comprises the following steps: step one, measuring temperature and pressure of an inlet and pressure of an outlet; step two, converting flow of the inlet into the flow in a standard state; step three, calculating a dynamic anti-surging control curve according to the temperature and the pressure of the inlet and a static anti-surging control curve; step four, finding out anti-surging control pressure corresponding to the converted flow in the standard state according to the dynamic anti-surging control curve, and outputting an anti-surging control signal when the pressure of the outlet is equal to or larger than the anti-surging control pressure; and step five, controlling a normal operation point of the operation of the blast blower according to the anti-surging control signal. The method establishes the dynamic anti-surging control curve and realizes the anti-surging control under different ambient temperatures and pressure states.

The invention relates to a novel surge control circuit and belongs to the technical field of electronic circuits. A relay rapidly works and is closed at the moment of powering-on. A power supply supplies power to a load through a thermistor NTC. Because of the characteristics of the thermistor NTC, supply current is kept in a stable and constant current state. When a capacitor in a load circuit is charged and works stably, the relay is opened, the power supply supplies power to the load through the normally-closed contact of the relay. Since the thermistor NTC and the normally-closed contact of the relay are connected in parallel, the thermistor NTC is disconnected and stops working. By detecting input voltage through an instantaneous comparison amplifier, when the power supply is turned off and is turned on again, the instantaneous comparison amplifier can output a resetting signal to reset a time-delay switching circuit, so as to ensure that the switching time of a time-delay switch is stable and the misoperation is eliminated when the time-delay switch is turned on or off at each time. Therefore, the requirement on the instantaneous power of the power supply is reduced, the damage rate of the thermistor NTC is greatly decreased, the power supply cost is reduced, the power consumption is extremely low because the novel surge control circuit is in a static state after surge control work is completed, and the common practicability and the good economic and technical efficiency are realized.

Methods and systems are provided for improving surge control. When surge conditions are approached, a reference governor reduces engine airflow at a slower rate and to a higher level than the engine airflow required to meet the reduced torque demand. The excess torque resulting from the extra airflow is offset by applying a negative torque on the driveshaft via an electric machine coupled to the engine or via alternate engine actuator adjustments.

An aspirator coupled between an inlet of a compressor and an engine intake manifold may include sonic / supersonic expansion curves for both forward and reverse flow through the aspirator. Suction flow may enter a first entraining port coupling an ambient side of the aspirator with a vacuum source during reverse flow through the aspirator, whereas suction flow may enter a second entraining port coupling a manifold side of the aspirator with the vacuum source, the first entraining port counter sunk relative to a nominal slope of the aspirator to reduce flow disruption caused by the port during forward flow through the aspirator. A radial-flow aspirator shut-off valve arranged in series with the aspirator may be controlled to enable or disable motive flow through the aspirator, and motive flow may enter the valve in a direction perpendicular to a motive flow axis of the aspirator when the valve is open.

A fuel cell system having an adaptable compressor map and method for optimizing the adaptable compressor map is provided. The method includes the steps of establishing an initial operating setpoint for an air compressor based on the adaptable compressor map; monitoring a surge indicator; adjusting the adaptable compressor map based on the monitored surge indicator; determining a desired operating setpoint based on the adjusted adaptable compressor map; and establishing an adapted operating setpoint for the air compressor based on the adaptable compressor map following the adjustment thereof. The steps are repeated until the adaptable compressor map for the air compressor is optimized.

A compressor active surge control system that includes an air recirculation line that has a first end connected downstream of a compressor outlet and a second end connected upstream of a compressor inlet. The gas recirculation line recirculates compressed air from the compressor outlet to the compressor inlet. Also included in the system is a mixer positioned to receive both ambient air and recirculated air. Mixing of the air homogenizes the air prior to its introduction into the compressor. An air cooler may be included that cools the recirculated air prior to its introduction into the compressor. Cooling and mixing of the recirculated air expands the operating range of the compressor by reducing the incidence of surge. Various existing components, such as intercoolers and filters, may serve the additional duty of cooling or mixing the recirculated air.

A valve-venting method increases the durability of flow restrictors within gas venting valves used on large diameter water and sewer pipelines such that transient high pressure conditions that can cause rapid adiabatic heating of the discharging gases are prevented from causing flow erosion and debris wear induced by the high velocities and thermal softening of the valve components. The method utilizes wear resistant orifice inserts that are more conductive than the valve component to better distribute the heat, and dynamic surge control geometry to slow the heat flow and provide progressive water-hammering control during high pressure events.

The invention discloses a compressor start control method. According to the control timing sequence of a lubricating oil system, an oil pump in the lubricating oil system is made to be in a normal state; when the oil pump in the lubricating oil system is in the normal state, an air cooling motor is started; after the air cooling motor is started, a valve control timing sequence is started, so that an inlet valve, an outlet valve, a loading valve, an isolation valve and an air release valve are controlled; after the loading valve is closed, high-voltage valve closing control is conducted; after high-voltage valve closing control is successful, a high-voltage frequency conversion motor is operated; after the high-voltage frequency conversion motor is normally operated, the rotating speed of the high-voltage frequency conversion motor is adjusted and controlled, so that a compressor works in an optimal state; an anti-surge control valve is closed, so that the compressor is in a normal work state. By the adoption of the compressor start control method, the compressor is safely started, a large amount of labor cost is saved, and malfunction, operation delay and the like which are caused by manual operation are avoided.

The invention discloses an anti surge control method and device. An outlet pressure value, an inlet pressure value and an inlet flow rate are obtained; a coordinate of a working point is calculated according to the outlet pressure value, the inlet pressure value and the inlet flow rate; when a deviation of the working point coordinate occurs, and a differential of a working point offset to time is calculated ; according to the differential of a working point offset to time, the deviation of an anti surge control line is calculated and the position of the anti surge control line is revised; according to the revised surge control line, whether the working point is in a surge area is judged; when the working point is in the surge area, an anti surge control signal is output for conducting an anti surge control. The embodiment of the invention references a differential response processing method, successfully solves the problem of the working point disturbance and reduces the probability and risk of misjudgment.

The invention provides a sequential turbocharging system anti-surge control device and a control method. The sequential turbocharging system anti-surge control device is composed of a diesel engine speed transducer, a turbo-charger speed transducer, a pressure pickup, an air flowmeter, an air valve, a gas valve, an air circulating valve, an air bypass valve, an air circulating pipeline, an air bypass pipeline, a signal conditioning module, a signal acquiring module, a signal processing module, a storing module, an electromagnetic module and a valve driving device. The method is as follows: acquiring signals of each sensor by a control device; judging whether the interval time of the opening of the gas valve and the air valve is in the allowable range; comparing the detected operation point information with a set control line to obtain whether a surge indication exists or not, and giving corresponding instruction to regulate the air circulating valve and the air bypass valve. The invention can greatly reduce surge events taking place in the process of diesel engine sequential turbocharging system conversion, prolonging the service lift of the turbo-charger and improving transient performance of the diesel engine sequential turbocharging system in conversion process.

The invention discloses an unmanned surface vehicle anti-surge control device and method based on support vector regression. The device mainly comprises an unmanned surface vehicle, an embedded computer, omni-directional wireless equipment, a GPS and a compass. The wireless equipment and a GPS body are mounted in an unmanned surface vehicle control cabinet, and an antenna is mounted on the top of a vehicle body. The compass is mounted at the position of the center of gravity of the vehicle body. The embedded computer is connected with the GPS, the compass and the wireless equipment, and a control algorithm is stored in the embedded computer. In the implementation process, the surge information of related sea areas, which is monitored by X-band radar, is received through the wireless equipment, the position and gesture information of the unmanned surface vehicle is acquired in real time by the compass, surges and the position and gesture information are resolved by an anti-surge control algorithm based on the support vector regression, and a control instruction is output; the unmanned surface vehicle carries out the control instruction, and surge disturbance prevention movement control over the unmanned surface vehicle is achieved. The unmanned surface vehicle anti-surge control device and method based on support vector regression can be effectively adaptive to outside disturbance.

The invention provides a surge control system of a compressor unit and belongs to the technical field of compressor unit automation control. The surge control system of the compressor unit provided by the invention is low in system operation failure rate and low in long-period operating cost. The surge control system comprises a braker, a high-speed pressure transmitter, a throttling device, a temperature sensor and a gasp-preventing regulating valve and is structurally characterized in that the controller is respectively connected with the high-speed pressure transmitter, the throttling device, the temperature sensor and the gasp-preventing regulating valve, and the high-speed pressure transmitter is used for detecting the pressures of the inlet and outlet of a compressor, converting the pressures into a standard analog quantity signal and sending the standard analog quantity signal into the controller; the throttling device is used for detecting air inflow and air outflow of the compressor, converting the air inflow and the air outflow into a standard analog quantity signal and sending the standard analog quantity signal into the controller; the temperature sensor is used for detecting the inlet temperature and outlet temperature of the compressor, converting the inlet temperature and the outlet temperature into a standard analog quantity signal and sending the standard analog quantity signal into the controller; and the controller is used for receiving pressure, flow, temperature signals input by the high-speed pressure transmitter, the throttling device and the temperature sensor and outputting a surge control signal through operation so as to control a gasp-preventing valve to adjust the inspiratory flows of the compressor.

Provided is a control apparatus of an extracted air booster system of an integrated gasification combined cycle power plant, which control apparatus can additionally serve a sufficient pressure control function and a sufficient antisurge control function. For example, when an inlet guide vane is fully closed or has a small opening degree equal to or smaller than a predetermined opening degree, a second control section of the control apparatus of an extracted air booster system performs pressure control based on a pressure deviation, instead of or as well as antisurge control. In the pressure control, the degree of opening of an antisurge valve is controlled so that a booster outlet pressure detection value can become equal to a set pressure value. In a case where a pressure ratio is larger than a set pressure ratio value, it is also effective that the second control section performs the antisurge control even when the inlet guide vane is fully closed.