289results about "Fluid parameter" patented technology

The shutdown of a compressor (10) installed in a refrigerant circuit (2) in air conditioning or refrigeration system is controlled so as to prevent unpowered reverse rotation of the compressor. Prior to terminating electric power to the compressor drive motor (24), the pressure within the system is relieved and substantially equalized across the compressor, thereby eliminating the possibility of unpowered reverse rotation of the compressor at shutdown. Pressure relief and equalization may be achieved by reducing the operating speed of the compressor to a low forward speed for a period of time prior to deenergizing the compressor drive motor. Pressure equalization may also be achieved by driving the compressor in reverse rotation prior to deenergizing the drive motor.

An apparatus, system and method for regulating fluid flow are disclosed. An apparatus for infusing fluid into a patient includes a housing, a tube-contact member, a rotating arm, and a tube-retention cover. The housing has an opening on a front side of the housing. The opening is sized to receive a drip chamber having an inlet tube and an outlet tube. The tube-contact member contacts one of the inlet tube and the output tube of the drip chamber when inserted into the opening. The rotating arm is coupled to the tube-contact member and is configured to rotate along an axis. The tube-retention cover is configured to close when the drip chamber is initially loaded into the opening.

A pump includes a power end and a fluid end coupled to the power end. The power end includes a plunger, and the fluid end includes a crossbore in selective fluid communication with inlet and outlet bores. A suction valve controls fluid communication between the inlet bore and the crossbore, and a discharge valve controls fluid communication between the outlet bore and the crossbore. An actuation device is used to move the discharge valve between an open position and a closed position. A position sensor measures a position of the plunger. A pressure sensor measures a pressure of the crossbore, the inlet bore, or the outlet bore. A controller operates the discharge valve based on data from at least one of the position sensor or the pressure sensor.

Systems and methods provided herein relate to optimization of the motor of a pump system. Voltage-frequency ratios are adjusted while maintaining pumps speed in a systematic manner to lower power usage. Oscillations of the motor speed are detected, and voltage-frequency ratios adjusted to maintain low levels of oscillations while lowering power usage. Savings resulting in the optimization of the pump system are estimated.

A pressurized gas delivery system includes at least a first gas supply source and a second gas supply source. The first gas supply source is configured to supply a first pressurized gas output, and the second gas supply source is configured to supply a second pressurized gas output. A valve including at least a first position and a second position fluidly connects an outlet of the first gas supply source to a system outlet in the first position and to an inlet of the second gas supply source in the second position.

Apparatus and associated methods relate to using an electro-hydraulic solenoid valve to provide regulation of fluid displacement of a variable-displacement hydraulic pump. A mechanical control mechanism is configured to control displacement of hydraulic fluid pumped from a hydraulic input port to a hydraulic output port. The electro-hydraulic solenoid valve regulates fluid conductivity between a hydraulic output port of the variable-displacement hydraulic pump and a hydraulic control cylinder, which operates a hydraulic control piston coupled to the mechanical control mechanism controlling fluid displacement. An electronic control unit is configured to generate and transmit an electrical control signal to the electro-hydraulic solenoid valve in response to a metric of the variable-displacement hydraulic pump as measured by a transducer. The electronic control unit generates the electrical control signal so as to control the metric measured to within a predetermined control band about a target value.

Method for controlling a compressor (10) which drives a pneumatic tool, with a maximum allowed pressure (p_max) and an associated compressed air consumption (q_max), the method comprising the step of regulating the operating pressure (p_compr) of the compressor (10), said method comprising: - if the operating pressure (p_compr) is lower than p_max minus a value (Z): controlling the compressor (10) such that the flow rate supplied by the compressor (10) is not limited; - if the operating pressure (p_compr) is higher than or equal to p_max: controlling the compressor (10) such that the flow rate supplied by the compressor (10) does not exceed the compressed air consumption (q_max) at p_max; - if the operating pressure (p_compr) is higher than p_max minus the value (Z) and is lower p_max: controlling the compressor (10) such that the operating pressure (p_compr) remains lower than p_max.

A method for controlling a first reference temperature in an apparatus (1) for compressing a gas, the apparatus (1) comprising: an oil-injected element (2) for compressing the gas; and an oil injection pipe network (6) for injecting oil into the oil-injected element (2); the oil injection pipe network (6) comprising distribution means (8) for distributing oil to a first part and a second part; an oil cooler (10) cooled by a fan (9) for cooling the first part; and a bypass (11) for bypassing the second part over the oil cooler (10); wherein first a distribution rate of the first part is controlled to a required distribution rate, and then a speed of the fan (9) is controlled to a required speed, optionally based on the distribution rate, the distribution rate being controlled by a control unit (15) based on a non-fuzzy logic algorithm.

A method of prolonging the life of a peristaltic pump, including setting a timer for a predetermined rest time after the peristaltic pump is used, transmitting a micro pulse to a motor of the peristaltic pump after the predetermined rest time has elapsed, and shifting a motor roller from an initial position to a second position so that a pinch point of a tube of the peristaltic pump is formed in the second position. Further, a non-transitory computer readable storage medium storing instructions that cause the one or more computers to set a timer for a predetermined rest time after the peristaltic pump is used, transmit a micro pulse to a motor after the predetermined rest time has elapsed. and shift a motor roller from an initial position to a second position so that a pinch point of a tube of the peristaltic pump is formed in the second position.

The invention relates to a method for compressing and providing a gas, in particular hydrogen, in which the obtained gas (a) is compressed by means of a compression device (140) having one or more compressor stages and the compressed gas (b) is supplied to a storage and / or pressure regulation system (120), and in which the compressed gas (b) is supplied to the storage and / or pressure regulation system (120). The gas (d) provided by the storage and / or pressure regulation system (120) is supplied to a supply device (130) for further use, in particular for delivery to a vehicle, the gas following one or at least one of the plurality of compressor stages and the compression device are cooled by means of a refrigerator (15) via a coolant circuit (e, f, g, h), and wherein the coolant circuit (e, f, g, h) is connected to the supply device (130). The provision device (130) is further cooled by a refrigerator (15).

The present invention relates to a pump-operation support method and a pump-operation support apparatus. The pump-operation support method includes: a performance-characteristic acquisition process of acquiring a flow-rate vs. total-pump-head typical performance curve in a rated operation and a rated rotational speed as performance characteristics of a support target device identified by the model number of a pump device; an installation-state acquisition process of acquiring an actual pump head as an installation state of the support target device; an operation-state acquisition process of acquiring operating frequency, suction pressure, and discharge pressure as an operation state of the support target device; and a first operation support process of calculating operating conditions in a reference operation of the support target device when the support target device is operated in the installation state and the operation state, wherein the first operation support process includes calculating flow rate and total pump head in the reference operation based on the performance characteristics, the installation state, and the operation state.

Disclosed herein are embodiments of a method for determining operational information of a metering pump, the metering pump comprising a dosing chamber, a displacement member and a drive motor for driving the displacement member, wherein the method comprises: receiving a plurality of detected values of an indicator quantity indicative of a strength of activation of the displacement member at respective positions of the displacement member during operation of the metering pump; computing the operational information from a machine-learning model trained to output said operational information responsive to receiving a plurality of input values derived from detected values of the indicator quantity.

Provided is a technology capable of reducing pressure loss due to cooling of a compressed gas.　A gas compressor 100 comprises: a bypass passage 11 for bypassing an aftercooler 10; a bypass valve 13 provided in the bypass passage 11; a cooler bypass valve 12 provided between a connection part 19b and the aftercooler 10; an ammeter 16 for detecting a current value of a motor 1; a temperature sensor 14 for detecting a temperature of a compressed gas recovered from waste heat by a high-pressure stage waste heat recovery heat exchanger 9; a temperature sensor 22 for detecting a temperature around the gas compressor 100; and a control device 17 for opening and closing the bypass valve 13 and the cooler bypass valve 12 on the basis of the current value detected by the ammeter 16, the temperature detected by the temperature sensor 14, and the temperature detected by the temperature sensor 22.

The present invention relates to a water pump dry-run detection method and system, where the method includes: converting an operating current signal of a water pump into a voltage signal; collecting, at a frequency, a voltage signal value output by the voltage-current conversion module within one pulse cycle of the water pump in a dry-run state to obtain a first determined threshold corresponding to the dry-run state; calculating determined data at a current time point based on a voltage signal value of the water pump during use within the pulse cycle; and determining, based on a magnitude relationship between the determined data and a first determined threshold, whether the water pump is in the dry-run state.

Provided compressor control module, CCM, adapted to control an output of a variable displacement swash plate compressor, it is an object of the present invention to improve the efficiency of the compressor. The object is solved by: either directly calculate, or receive from an external source, for example the HVAC control unit, a signal indicating the desired or required output from the variable displacement swash plate compressor (30), also referred to as control target or set value, for example, but not limited to, a suction pressure, a piston stroke length, an evaporator outlet air temperature, a refrigerant mass flow and / or a work done on fluid; receive the current / actual value of the value; receive or calculate the current rotation speed and angle, with respect to the rotation axis, of the swash plate, or the current piston stroke length and its reciprocating frequency, respectively, (48) of the variable displacement swash plate compressor; receive or calculate optionally additional current values of the compressor, the air conditioning system or from the vehicle, like the discharge pressure, the crank case pressure, the delta pressure between suction pressure and crank case pressure, the evaporator outlet air temperature, the engine speed, but not limited to; determine the difference between the desired or required output from the variable displacement swash plate compressor and the current output of the variable displacement swash plate compressor; and output a signal to the valve driving unit which will adjust the angle of the swash plate (48) such that the actual output of the variable displacement swash plate compressor becomes closer to, or the same as, the desired or required output as obtained in step a), also taking into account the additional values received or calculated in c) and d).

A system includes a fluid pump and a first pressure sensor disposed on or near an inlet of the fluid pump. The system further includes a second pressure sensor disposed on or near an outlet of the fluid pump and a control system. The control system includes a processor configured to receive a first signal from the first pressure sensor. The processor is further configured to receive a second signal from the second pressure sensor, and to derive a pump slip measure based on the first signal and the second signal.

Disclosed is a method of controlling a condensate pump system which comprises a pump and a controller connected to the pump, the method comprising measuring a current value I­m drawn by the pump durin

The invention is directed to a process water analyzer (10) for automatically analyzing a parameter of a water sample, comprising a process liquid reservoir tank (70,72) with a process liquid (70',72'), whereas the process liquid reservoir volume (V70,V72) in the reservoir tank (70,72) defines a reservoir liquid level (170,172) at a reservoir liquid level height (h70, h72), a dosage chamber (30) fluidically connected to the process liquid reservoir tank (70,72) and being positioned fluidically downstream of the process liquid reservoir tank (70,72), and a positive displacement dosage pump (20) fluidically connected to the top of the dosage chamber (30) for sucking in the process liquid (70', 72') into the dosage chamber (30), whereas an air cushion (27) is always provided vertically between the dosage pump (20) and a dosage chamber liquid level (I) in the dosage chamber (30), so that a liquid column (Ic70, Ic72) with an effective vertical liquid column length (c70,c72) is given between the reservoir liquid level (170,172) and the dosage chamber liquid level (I), whereas the dosage pump (20) directly sucks a pressure-adapted gas volume (Vgas) of the air cushion (27) having an air cushion pressure (P) so that a set process liquid volume (Vliquid) is pumped into the dosage chamber (30), and whereas a process liquid dosage control unit (200) is provided, the process liquid dosage control unit (200) providing the value of the pressure-adapted pumped gas volume (Vgas) dependent on the air cushion pressure (P) effected by the effective vertical liquid column length (c70,c72).

A method for controlling airflow of an electric air compression system of an electric or hybrid vehicle is disclosed. The vehicle includes air consumers connected to an air storage system. The method includes continuously monitoring air consumption data. The air consumption data are defined by an activation status of the air consumers and / or air pressure gradient in the air storage system. The method includes determining an air consumption based on the monitored air consumption data and comparing the determined air consumption with a predetermined air consumption threshold. If the determined air consumption is below the predetermined air consumption threshold, the electric air compression system is controlled to operate at a first airflow value. If the determined air consumption is equal to or above the predetermined air consumption threshold, the electric air compression system is controlled to operate at a second airflow value which is greater than the first airflow value.

In order to create a control unit that can interact with a wide variety of operating units and / or state detection units, it is proposed that the control unit comprise a basic module which has at least one processor and at least one memory for the required program code to operate the processor, as well as connections for operating units and / or state detection units that execute basic functions, and that the processor and the program code stored in the memory are designed in such a way that additional functions of an add-on module that can be connected to the basic module can also be executed with them.

The invention provides a method for controlling a hydraulic drive system having at least two hydraulic machines (2a, 2b).SOLUTION: For each of the hydraulic machines 2a, 2b, a setpoint value for a delivery quantity of the hydraulic machine is detected, wherein the delivery quantity is dependent on the displacement volume, and wherein manipulated values for the displacement volumes of the two hydraulic machines 2a, 2b are implemented in such a way that a ratio of the manipulated values to one another is equal to a corresponding ratio of the setpoint values, and in such a way that at least one condition is satisfied, the at least one condition includes a condition that the sum of the driving amount requests of the hydraulic machines 2a and 2b corresponding to the operation values is equal to or smaller than the driving amount maximum value, and the hydraulic machines 2a and 2b are controlled using the determined operation values.SELECTED DRAWING: Figure 1

Embodiments of the present disclosure are directed to a system for monitoring operating conditions of a saltwater disposal pump system, which includes a processing device that causes a controller to receive an alarm from the at least one machine that exceeds a predetermined alarm level indicative of an abnormal machine operation, receive a plurality of data from a plurality of sensors that are indicative of a current operating conditions of a saltwater disposal pump assembly, derive an expected value utilizing a statistical regression analysis, determine whether the expected value and a history of the plurality of data correlate at a point where the plurality of data exceeds the predetermined alarm level, determine whether a deviation from a predefined operating profile exceeds a predetermined machine data validation threshold value, validate the alarm, output an alert of the deviation and inhibit further operation of the saltwater disposal pump assembly.

Example hydraulic systems, control systems, and methods for reducing pump flow ripple are described. Variation in pump displacement, from a nominal pump displacement, based on an angle of a rotating member of a pump is determined. A controller then controls speed and torque of an electric motor driving the pump to compensate for or counter the variation in the pump displacement and reduce flow ripple.

The present invention involves a rotary peristaltic pump and associated method employing the relaxation of pressure on flexible tubing between the rotor and stator of the pump to restore the rotor to a start angle while a valve on the output of the pump is closed to avoid progress of fluid through the system. Three different implementations of the pump and method are presented including reciprocating the stator, reciprocating the rotor, and retracting the idler rollers of the rotor into the rotor to relieve the pressure on the flexible tubing. A controller ensures the appropriate switching and timing of the valve and rotor of the pump. The pump and associated method are directed to the precision dispensing of pharmaceutical fluids into containers, including containers held in container nests.

Provided is a pump system that includes a primary housing having a first part removably coupled to a second part. An intermediate liner is coupled to second part of the primary housing at a first cavity such that the intermediate liner and the first cavity define a secondary fluid chamber. An inner liner is arranged between the first and second parts of the primary housing, the inner liner being removable from the primary housing upon decoupling the first part from the second part of the primary housing. The inner liner defines a primary fluid chamber. A first side of the inner liner is proximate the first part of the primary housing. A second side of the inner liner is proximate the intermediate liner. A valve is coupled to a space between the second side of the inner liner and the intermediate liner to allow air to exit from the space

The application discloses a method and a device for controlling cylinder switching of a compressor, a unit and an air conditioning system. The method includes : determining whether the compressor needs to perform cylinder switching; if so, adjusting current operating frequency according to a system pressure difference so that both the adjusted operating frequency and the system pressure difference meet a cylinder switching condition of the compressor; and controlling the compressor to perform cylinder switching. At the moment, the system pressure difference and the operation frequency are stable, and would not interfere the compressor's maintaining of the single-cylinder or double-cylinder operation state, which guarantees the energy efficiency of the unit where the compressor is located, and improves the use experience of a user.

A shovel (100) comprises a lower traveling body (1), an upper turning body (3) that is turnably mounted on the lower traveling body (1), an engine (11) that is mounted on the upper turning body (3), a main pump (14) that is driven by the engine (11), and a controller (30) that controls the flow rate of a hydraulic fluid discharged by the main pump (14). The controller (30) delays main pump (14) responsiveness until the actual torque of the engine (11) rises to a level corresponding to the load when the load on the engine (11) has been increased.

A hydraulic system (1) includes a variable displacement pump (3), an electric motor (5), a controller (6), and a sensor (a pressure sensor (61)). The variable displacement pump has the mechanical compensator (31) that changes a pump displacement. Based on a measurement signal of the sensor, the controller outputs a control signal for increasing a rotational speed of the electric motor in a case where the supply flow rate falls below a required flow rate of the hydraulic device, and the controller outputs a control signal for decreasing the rotational speed of the electric motor in a case where the supply flow rate exceeds the required flow rate of the hydraulic device.

A method includes measuring a fluid pressure of a fluid in a fluid supply line of an infusion pump. The fluid pressure includes a motor pressure and a patient pressure. The method also includes determining the patient pressure. The determining includes removing, by an adaptive filter, to remove the motor pressure from the measured fluid pressure. The removing includes generating a predicted motor pressure based on a current of the motor, generating an error signal based on a comparison between the predicted motor pressure and the measured fluid pressure, and removing the motor pressure from the measured fluid pressure when an error value indicative of the error signal is less than an error threshold. The method also includes adjusting a setting of the infusion pump based on the patient pressure. Related methods and articles of manufacture, including apparatuses and computer program products, are also disclosed.