63results about "Pump control" patented technology

A capacity control algorithm for a multiple compressor liquid chiller system is provided wherein the speed and number of compressors in operation are controlled in order to obtain a leaving liquid temperature setpoint. In response to an increase in the load in the chiller system, the algorithm determines if a compressor should be started and adjusts the operating speed of all operating compressors when an additional compressor is started. In response to a decrease in the load in the chiller system with multiple compressors operating, the algorithm determines if a compressor should be de-energized and adjusts the operating speed of all remaining operating compressors when a compressor is de-energized.

The invention provides a control method and system of a compressor electric heating band in an air conditioner, wherein the control method comprises the following steps of: detecting the air exhaust temperature of a compressor or the outdoor environment temperature of the air conditioner when the air conditioner is at the standby condition, and comparing the detection temperature value and the setting value, and controlling the starting and closing of the compressor electric heating band under the standby condition according to the compared result. The control system comprises a first sensor, a second sensor, a first control module, a comparison module and a relay, wherein the first sensor detects the outdoor environment temperature; the second sensor detects the compressor air exhaust temperature; the first control module enables the first or the second sensor to operate in the standby state of the compressor, and is respectively connected with the first sensor and the second sensor electrically; the comparison module is used for comparing the detection value and the setting of the first or the second sensor, and is electrically connected with signal output ends of the first sensor and the second sensor; and the relay controls the starting and closing of the electric heating band, an input end of the relay is electrically connected with a signal output end of the comparison module, and an output end of the relay is electrically connected with the electric heating band. According to the invention, the standby power consumption of the air conditioner can be lowered.

An apparatus for controlling an operation of compressors includes a single microcomputer for calculating stroke estimate values of multiple compressors based on voltage and current values applied to the multiple compressors, and generating a plurality of switching control signals for independently controlling a voltage applied to the multiple compressors based on the calculated stroke estimate values and pre-set stroke reference values; and switching devices each installed in the multiple compressors, for independently controlling the voltage applied to the multiple compressors according to the plurality of switching control signals. Since the reciprocating compressors are controlled by a single apparatus, costs and power consumption can be reduced.

The disclosure relates to a cylinder head having at least one cylinder. The cylinder head comprises a radial turbine including a rotor arranged in a turbine casing and rotatably mounted on a shaft, an overall exhaust line which opens into an inlet zone of the radial turbine, said zone merging into a flow duct which carries exhaust gas, and at least one coolant duct integrated into the turbine casing to form a cooling system, the at least one coolant duct extending in a spiral around the shaft in the casing, wherein the at least one coolant duct extends circumferentially around and at a distance from the flow duct over an angle α, where α≦45°.

A hermetic compressor comprises a hermetic container, an electric motor and a compressing mechanism installed inside of the hermetic container, lubricating oil and refrigerant gas enclosed within the hermetic container, a first temperature detector disposed to a predetermined location within the hermetic container, and a second temperature detector disposed to a location adjacent to a surface of the lubricating oil in the hermetic container. The predetermined location where the first temperature detector is disposed is one of a location near an upper end and another location near a lower end within a space inside the hermetic container, and an amount of the lubricating oil in the hermetic container is determined according to temperatures detected by the first temperature detector and the second temperature detector.

The embodiments described herein include a control system and method for a compressor that is operable with a climate system. The control system enables optimal climate system operation by efficiently controlling the operating speed of the compressor.

A compressor output calculation unit having a variable displacement compressor, a condenser, a pressure reducing mechanism and an evaporator, wherein a compressor torque or power is calculated based on a detected or estimated value of a refrigerant flow rate, a detected or estimated value of a refrigerant discharge pressure, a detected or estimated value of a refrigerant suction pressure, and a compressor rotational speed, and a control unit using the same. The compressor torque or power may be estimated at a high accuracy without using a refrigerant flow sensor.

A gear pump includes a gear to be driven by a drive shaft, a pair of side plate members adjoining side surfaces of the gear, respectively, to restrain leakage of an operating fluid, and a tip seal member or seal block for sealing the gear tip or circumference of the gear. At least one of the side plate members and the tip seal member are integral parts of a sealing member.

A method of and device for detecting a leak in reciprocating machinery, comprising at least two pistons, by the volume flow at least out of the reciprocating machinery being monitored and analysed, e.g. by means of Fourier analysis, in order to make it possible to detect a flow component, where the flow component has a frequency that differs from the fundamental frequency of the reciprocating machinery, the fundamental frequency of the reciprocating machinery being constituted by the rotational frequency of the reciprocating machinery multiplied by the number of pistons in the reciprocating machinery.

A thermal energy recovery device includes: a circulating flow path connected to a heater, an expander, a condenser and a circulating pump for circulating a working medium; a bypass valve in a bypass path connecting the upstream side region and the downstream side region of the expander in the circulating flow path; a power recovery machine connected to the expander; a circulating pump sending the working medium condensed in the condenser to the heater; a cooling medium pump sending a cooling medium to the condenser; an upstream side sensor detecting the pressure/temperature of the working medium on the expander upstream side in the circulating flow path; and a controller controlling the bypass valve and the cooling medium pump. The controller opens the bypass valve after stopping the circulating pump, and drives the cooling medium pump if the pressure/temperature of the working medium on the expander upstream side exceeds a threshold.

The invention provides a fan slight fault detection method based on vibration signal circulation stability. The fan slight fault detection method comprises the following steps: step (1) acquiring an acceleration signal; step (2) guiding the acquired signal into a program which is to run, and detecting by using a correlation characteristic function based on circulation stability characteristics toobtain a circulation density spectrum; step (3) normalizing the circulation density to obtain a circulation correlation spectrum; step (4) obtaining a reinforced envelope spectrum according to the circulation correlation spectrum, storing the longitudinal coordinate data of the reinforced envelope spectrum, namely the data obtained by real-time treatment; step (5) calculating the correlation of the data obtained by real-time treatment and the data in a database by utilizing a correlation function; and step (6) judging whether the fault is normal or not or belongs to any fault according to a correlation coefficient fault distinguish standard, and adding a judgment result to the database. The fan slight fault detection method provided by the invention can be utilized for detecting and judging the fault type of a fan in real time, realizes more accurate detection and is quite high in practicability.

A method of surge protection for a dynamic compressor that has a corresponding compressor map. A control system continually calculates an equivalent polytropic head parameter in order to define a surge limit line. The system then calculates a control parameter and determines the distance the control parameter to the surge limit line wherein the control parameter is dynamic to changes in compressor load and invariant to changes in suction conditions and gas compressibility. As a result of the distance of the control parameter to the surge limit line, the surge valve of a dynamic compressor is actuated to prevent surge.

A vapor compression cooling system includes a centrifugal compressor(s) for compressing a primary fluid in a cycle including at least two compressions, and a control module for controlling the centrifugal compressor dependent upon at least a condition of a secondary fluid. The module controls a power of the centrifugal compressor by adjusting a speed of the motor driving the compressor and/or an opening of guide vanes associated with at least one impeller. The module may also control a pressure drop of a primary fluid moving through at least one expansion device. The at least two compressions may be made in parallel or in series. A related method includes compressing a primary fluid in a first and a second compression cycle and adjusting a parameter of the compressor dependent upon a calculated desired power of the compressor.

The invention provides a fan rotating speed synchronization method and a device, applied to a first fan and a second fan in butt joint. The method comprises the following steps: a pulse wave period width generated by a first fan rotating speed is sensed through a first hall sensor, and is converted to a first pulse wave signal to send to a microprocessor; a pulse wave period width generated by a second fan rotating speed is sensed through a second hall sensor, and is converted to a second pulse wave signal to send to the microprocessor; the microprocessor compares the first pulse wave signal with the second pulse wave signal corresponding to the pulse wave period widths of the first fan rotating speed and the second fan rotating speed; the microprocessor generates a pulse wave modulation signal to send to the second fan according to the magnitude difference of the first pulse wave signal and the second pulse wave signal; and the microprocessor controls the second fan rotating speed to be equal to the first fan rotating speed by the pulse wave modulation signal, thereby, effectively controlling the fan rotating speed synchronization and synchronously reducing the fan operation noise.

The invention discloses a partial-vacuum closed drainage system and a control method the drainage system. The drainage system comprises sanitary ware, a closed sewage collection box and a sewage draining machine unit, wherein the sanitary ware is mounted in a toilet; the closed sewage collection box and the sewage draining machine unit are mounted in an equipment room; the sanitary ware is connected with an inlet of the closed sewage collection box by a sewage draining pipeline I; an outlet of the closed sewage collection box is connected with the sewage draining machine unit by a sewage draining pipe II; the closed sewage collection box is provided with a vent pipeline III communicated with the outside; and the sewage draining machine unit is provided with an electric control unit. According to the drainage system and the control method, gas in the toilet is discharged to a municipal sewage draining pipe network through the closed sewage collection box and the sewage draining machine unit by controlling an electric valve and opening and closing of the electric valve, and utilizing the self-absorption function of a rotary cam pump; and the air quality of the toilet can be improved greatly in case that that underground ventilation is not smooth.

A controlling and regulating device of electric fan swing angle is prepared as utilizing a set of magnetic suction unit to combine with brake plate for controlling ratchet wheel mechanism and for operating gear ratchet clutch to control movement of epicyclic train so as to achieve purpose of regulating swing angle variation size of electric fan.

A pump-priming device configured to fit within the pump inlet circuit formed in the valve body of an automatic transmission is disclosed. The present pump priming device comprises a fluid-conducting structure having a fluid inlet and a fluid outlet, which is fabricated from sheet metal or flexible tubing and is designed to be installed within the original equipment manufacture valve body as a drop-in-place component. The present pump priming device diverts the flow of automatic transmission fluid (i.e. regulator exhaust fluid) released by the pressure regulator valve, which under normal operating conditions would flow from the pressure regulator valve back to the sump, and to redirect such flow of regulator exhaust fluid back to the pump inlet. Such redirection of regulator exhaust fluid pressurizes the pump inlet circuit and raises the output of the pump to provide adequate transmission fluid flow within the hydraulic system at low engine speeds.

The invention relates to the technical field of electric curtains. The invention discloses a curtain device with an automatic adjusting function and a warning function. The curtain device includes a wall and a supporting rod, a thick curtain is connected to the lower ends of hanging rings, the lower end of a second moving block is connected with a thin curtain, first fan blades are arranged at theright end of the second threaded lead screw, a photoresistor is connected to the upper end of the wall and the upper side of the supporting rod, second fan blades are arranged on the outer side of arotating shaft, a control device is arranged in the wall, an air bag is connected between fixing supports, and a variable resistor corresponding to metal balls is arranged on the upper side in the wall. The photoresistor is irradiated by sunlight, the control device controls a first driving device to drive a first threaded lead screw to rotate, wind power generated by rotation of the second fan blades pushes the first fan blades to rotate slowly, the first fan blades drive the second threaded lead screw to rotate, the second moving block drives the thin curtain to move leftwards, and the structure solves the problem that an existing electric curtain cannot be adjusted according to the illumination angle.

The invention discloses a fireproof rolling shutter door comprising a wall body, vertical plates, a U-shaped connecting frame, a roller shutter plate, a counterweight plate, a driving motor, a water pump, a ground, a placing box and a control panel. The wall body is fixed on the top of the ground; and an inlet and an outlet are formed in the wall body. The vertical plates are fixed symmetrically on one side wall of the wall body and are arranged at the two sides of the inlet and the outlet respectively. The bottoms of the vertical plates are fixedly connected with the top of the ground. The U-shaped connecting frame is fixed on the tops of the vertical plates; and one side wall of the U-shaped connecting frame is fixedly connected to one side wall of the wall body. A rotating rod is arranged in the U-shaped connecting frame; the two ends of the rotating rod are in rotation connection with the inner walls of the two sides of the U-shaped connecting frame through bearings. The roller shutter plate is arranged below the U-shaped connecting frame; and the counterweight plate is fixed at the bottom of the roller shutter plate. When a fire occurs, the roller shutter plate is stopped frombeing thrown; and the roller shutter plate can be cooled.

The invention discloses a fan operation control system and a control method thereof. The control system comprises a natural wind replaying control system, a user interaction module, a temperature and natural person adaptation system, a core control module and a fan driving module. The natural wind replaying control system is used for storing and replaying natural wind speed change data. The user interaction module is used for inputting natural wind group selecting data, user newly-added natural wind data, fan mode switching commands and user body cold and warm feeling data. The temperature and natural person adaptation system is used for detecting the environment temperature and the temperature feeling of an adapted natural person and regulating a fan gear switching threshold value through the user body cold and warm feeling collected by the user interaction module. The core control module is used for data transfer and control between the modules and switching working modes of a fan. The fan driving module drives the fan to operate at a corresponding gear. Through the fan operation control system and the control method thereof, natural wind replaying, selection of the natural wind type and adaptation of the fan wind speed to the natural person are achieved.

A pneumatic system operation control device for variable control of the rotation speed of an electric motor for driving an air-compressor such that constantly supplied pressure to a terminal device is achieved in accordance with a discharge pressure measurement value of the air-compressor and a supply pressure measurement value to the terminal device. The control device: stores the discharge pressure measurement value and the supply pressure measurement value; and, upon receiving input of an air pipe network model composed of data for calculating a flow of air in an air pipe network, calculates a flow rate of air supplied to the terminal device and an update value of a control setting value, and updates the control setting value to be used for variable control on the basis of the update value.

A variable-vane assembly for a turbocharger includes an annular nozzle ring supporting an array of rotatable vanes, an insert having a tubular portion sealingly received into the bore of the turbine housing and having a nozzle portion extending radially out from one end of the tubular portion and being axially spaced from the nozzle ring with the vanes therebetween, and an annular retainer ring disposed radially outward of the nozzle ring and extending generally radially inwardly. The nozzle ring's face is stepped, and a radially inner edge of the retainer ring engages the face of the nozzle ring radially outward of the step, the radially inner edge of the retainer ring having an axial thickness that is less than the step height such that a remaining portion of the step is presented to the exhaust gas flowing through the nozzle.

Electronic pressure switch comprising a pressure sensor and a circuit provided in turn with a switch for the activation/deactivation of an electric pump, an input terminal and an output terminal for connection to the mains and connection between the pressure switch and the electric pump and a microcontroller for controlling the switch, which receives signals from the pressure sensor, wherein the electric circuit comprises a current sensor connected to the microcontroller, so that it can stop the operation of the electric pump due to overcurrent, thus avoiding having to mount a specific sensor in the electric pump. It also allows, by interacting with the pressure sensor through a programmed logic, an operation of the electric pump in no-load condition, without water, as well as water hammers, to be detected with greater reliability.

The invention provides a valveless micro pump with manually adjustable strokes. The pump comprises a shell body, a motor, a cylinder and a trunk piston. The motor is fixedly connected with the top of the shell body. An output shaft of the motor is connected with the trunk piston. The trunk piston protrudes into the cylinder. A convex part is formed on one side of the shell body. The valveless micro pump also comprises a manual regulating mechanism and an angle adjustment linkage mechanism. The manual regulating mechanism passes through the convex part, and can move up-and-down in the convex part. One side of the angle adjustment linkage mechanism is connected with the manual regulating mechanism, and the other side of the angle adjustment linkage mechanism is connected with the bottom edge of the shell body. The shell body is arranged on the angle adjustment linkage mechanism. The angle adjustment linkage mechanism is used for adjusting the angle between the trunk piston and the motor output shaft. The valveless micro pump with manually adjustable strokes can achieve the stroke adjustment by only manual operation without the necessity of using professional tools, and has the advantages of being simple and convenient to operate, simple in structure and low in cost.