3631 results about "Pressure difference" patented technology

The approach presented here relates to a determination appliance (100) for determining a viscosity of a fluid. The determination appliance (100) has at least one determination device (110) and a provisioning device (115). The determination device (110) is designed to determine the viscosity of the fluid and / or a rotational speed (ω) of a blade wheel (205) for conveying the fluid by using at least one detected volume flow of the fluid and a detected pressure difference of the fluid. The provisioning device (115) is designed to provide or send a viscosity signal (130) representing the viscosity determined by the determination device (110).

The approach presented here relates to a determination appliance (100) for determining a viscosity of a fluid. The determination appliance (100) has at least one determination device (110) and a provisioning device (115). The determination device (110) is designed to determine the viscosity of the fluid and / or a rotational speed (ω) of a blade wheel (205) for conveying the fluid by using at least one detected volume flow of the fluid and a detected pressure difference of the fluid. The provisioning device (115) is designed to provide or send a viscosity signal (130) representing the viscosity determined by the determination device (110).

The invention relates to the technical field of water pump intelligent control, in particular to a vacuum pump and water supply pump intelligent control system. A water supply pump liquid conveying adjusting module collects operation parameters and liquid state information of a water supply pump and analyzes the boundary layer thickness of an inner wall area of a water supply pump connecting pipeline; and judging the influence of the boundary layer thickness change on the liquid flow fluctuation, adjusting the rotating speed of the water supply pump and the valve opening, and generating a water supply pump initial operation adjustment result. According to the method, the operation parameters of the water supply pump and the liquid state information are collected in real time, the flow velocity and the flow velocity gradient of the liquid on the inner wall of the pipeline are measured to calculate the thickness of the boundary layer, meanwhile, the relation between the thickness and the pressure gradient is analyzed, the regulation and control capacity of fluid flow fluctuation is effectively improved, and the liquid conveying stability is enhanced. In the liquid conveying process, the influence of liquid viscosity is analyzed through temperature changes, the conveying state is monitored in combination with the pressure difference, the abnormal condition can be rapidly recognized and marked, and the safety and the fault response speed are improved.

The invention relates to a high-precision variable air volume valve and an air volume control method thereof. The variable air volume valve is composed of a valve body, a front valve block set, a rear valve block, two actuators and a controller, linear adjustment of the air volume can be achieved, the air volume adjustment precision is improved, and adjustment of high and low air volume intervals is supported. The controller collects pressure difference data of an inlet and an outlet through the pressure difference sensor, and the real-time air volume is calculated through a built-in Kolmogorov-Arnold (KAN) neural network model. By comparing the actual air volume with the target air volume in real time, the controller adjusts the actuator to change the opening degree of the front valve plate set and the opening degree of the rear valve plate set, and accurate air volume control is achieved. According to the technical scheme, the accuracy and the adjusting range of air volume measurement are improved, additional resistance in the air pipe is reduced, and the performance and the operation efficiency of an air conditioning system are remarkably optimized.

The invention discloses a gas flow sensor combination device based on temperature and pressure compensation and a flow correction method. The gas flow sensor combination device comprises a flow sensor combination, a pipeline mechanism, a data processing terminal, an environment pressure sensor and an environment temperature sensor. The pipeline mechanism comprises an air inlet pipeline and an air outlet pipeline, and a plurality of branches arranged in parallel are connected between the two pipelines; the flow sensor combination comprises laminar flow sensors arranged on the branches respectively and electromagnetic valves used for controlling the branches to be opened and closed, and the laminar flow sensors comprise laminar flow elements arranged on the corresponding branches. The laminar flow element is provided with a pressure difference sensor device used for measuring the pressure difference of an inlet and an outlet, a tail pressure sensor used for measuring the pressure and the temperature of fluid flowing through the laminar flow element, and a tail temperature sensor. The laminar flow sensor is used for measuring parameters such as temperature, pressure and pressure difference of fluid in real time, the parameters are calculated and corrected to obtain the flow in a standard state, and measured flow data are more scientific and accurate through temperature and pressure compensation.

The invention discloses an anti-liquid-impact compressor cylinder structure, a compressor and a wellhead natural gas compression method, and relates to the technical field of compressors, the cylinder structure comprises a cylinder barrel and a piston ring assembly, a piston cavity is formed in the cylinder barrel, the cylinder structure further comprises a partition plate, the partition plate divides the piston cavity into a working cavity and a buffering cavity, and the piston ring assembly is arranged in the working cavity; the communication channel is used for realizing mutual communication of the working cavity and the buffer cavity on the two sides of the partition plate; the partition plate is configured in the mode that when the pressure difference between the pressure of the working cavity and the pressure of the buffer cavity exceeds a set threshold value, the fixed relation of the partition plate in the piston cavity is damaged under the pressure difference between the two sides of the partition plate, the partition plate can move towards the side where the buffer cavity is located under the pressure difference, the compressor comprises the cylinder body structure, and the compression method is achieved based on the cylinder body structure. According to the scheme, the maximum pressure in the cylinder is reduced by adopting a method of expanding the clearance volume of the cylinder body when the liquid impact phenomenon occurs, and the response speed in the clearance volume expanding process can be effectively optimized.

The invention discloses a shield tunneling machine attitude control method and system based on axis deviation, relates to the technical field of shield tunneling machine control, and solves the problem that an existing shield tunneling machine control method cannot accurately control a shield tunneling machine to advance along a tunnel design axis. The method comprises the steps that in a posture control ring, a guiding system compares current posture data of a shield tunneling machine with target posture data determined by a tunnel design axis to obtain the axis deviation of the shield tunneling machine relative to the tunnel design axis through calculation, and the axis deviation is input into a posture controller to obtain the pressure difference between upper and lower partition hydraulic cylinders or left and right partition hydraulic cylinders; therefore, the pose deviation is continuously reduced, and the shield tunneling machine advances along the tunnel design axis; according to the method, a specific mathematical model is not needed, accurate tracking of the notch horizontal / vertical deviation reference trajectory can be achieved only through I / O data in the tunneling process of the shield tunneling machine, and the problem that attitude control is difficult due to the complexity of a shield tunneling machine system is solved.

The invention discloses an intelligent monitoring system for construction environment pollution, particularly relates to the field of tunnel construction environment pollution monitoring, is used for solving the problems of pollution diffusion and risk assessment, and accurately calculates an air flow vector field through an intelligent air pollution monitoring system in combination with a fluid dynamics principle and a Navier-Stokes equation. Air flow and pollutant diffusion paths in a tunnel are disclosed. And constructing a pressure gradient field, quantifying the pressure difference and air exchange capacity between regions, and providing driving force analysis of pollutant diffusion. Calculating a pollutant transmission coefficient through nonlinear coupling calculation in combination with an air flow correlation degree, a pressure gradient field and an air exchange capability coefficient, and quantifying the pollutant transmission capability of adjacent regions; and then real-time evaluation and grading are carried out on pollution risks, high-risk areas are identified in time, and early warning information is pushed through the intelligent terminal. Therefore, the ventilation strategy is optimized, the energy consumption is reduced, and the health of constructors and the construction safety are guaranteed.

A brake control device includes a brake operation member, a pressurization unit, a master cylinder unit, a connection path connecting a separation chamber and a reaction force chamber, an electromagnetic valve at the connection path, and a control device. The control device includes a specified control section configured to, when the brake operation member is operated in a closed state of the electromagnetic valve, execute activation-time control in which the pressurization unit supplies fluid to a servo chamber based on a predetermined pattern, a determination section configured to determine whether a pressure difference between pressure in the reaction force chamber and pressure in the separation chamber, is equal to or less than a threshold value, and a valve control section configured to open the electromagnetic valve when the determination section determines the pressure difference is equal to or less than the threshold value after start of the activation-time control.

The invention provides a centrifugal pump operation monitoring method and system, and the method comprises the following steps: collecting the operation parameters of a centrifugal pump in real time through a plurality of sensors, including inlet flow, inlet and outlet pressure and pressure difference, a main shaft vibration signal, a main shaft rotation speed, and the temperature of a pump body and a medium; denoising, abnormal value elimination and normalization preprocessing are carried out on the collected data; establishing a centrifugal pump spindle radial hydraulic exciting force model; calculating the alternating stress of the main shaft according to the hydraulic exciting force and predicting the fatigue life; and a fault early warning mechanism is designed based on the fatigue life prediction result, and real-time monitoring and fault early warning of the running state of the centrifugal pump are achieved. Through combination of data acquisition and processing, life prediction and a fault early warning mechanism, real-time monitoring of the running state of the centrifugal pump spindle and residual life prediction are achieved, and the running reliability and safety of equipment are improved.

A compressor may include first and second scrolls and a capacity modulation assembly. The capacity modulation assembly may include a valve ring and a modulation control valve. The valve ring is movable relative to the first scroll between a first position corresponding to a first capacity mode and a second position corresponding to a second capacity mode. The modulation control valve includes a valve body and a valve member that is movable relative to the valve body to cause corresponding movement of the valve ring. The valve body includes a cavity in which the valve member is movably disposed. The valve body includes passages in fluid communication with the cavity. A first pressure differential between fluid in one of the passages and fluid in another of the passages causes movement of the valve member to cause corresponding movement of the valve ring between the first and second positions.

The invention discloses a regulating valve flow coefficient obtaining method and system, and relates to the technical field of regulating valve parameter measurement. The method comprises the steps that the inlet and outlet pressure difference of a standard throttling hole is controlled to change according to a first preset condition, the first inlet and outlet pressure difference of the standard throttling hole and the first flow corresponding to each first inlet and outlet pressure difference are continuously collected in real time, the flow coefficient corresponding to each second inlet and outlet pressure difference is calculated according to the first inlet and outlet pressure difference and the first flow corresponding to each first inlet and outlet pressure difference, and then the correction coefficient corresponding to each first inlet and outlet pressure difference is calculated; controlling the opening degree of the to-be-tested regulating valve to change according to a second preset condition, continuously collecting second inlet and outlet pressure differences of the to-be-tested regulating valve and second flow corresponding to each second inlet and outlet pressure difference in real time, calculating to obtain a flow coefficient corresponding to each second inlet and outlet pressure difference, and correcting by using a corresponding correction coefficient to obtain a flow coefficient corresponding to each second inlet and outlet pressure difference; the calculated flow coefficient of the measured regulating valve is corrected through the correction coefficient, and the accuracy of the final flow coefficient can be improved.

The invention provides a control method and device for cleaning equipment, the equipment, a medium and a program product, and can be applied to the technical field of liquid cooling servers. The method comprises the steps of determining a pressure difference value between a reference pressure value and a real-time pressure value of fluid at an outlet of a target pump in the cleaning equipment; a preset pressure control parameter is used for processing the pressure difference value based on a lag relation, a rotating speed adjusting signal is determined, and the lag relation indicates the lag degree between the rotating speed change moment of the target pump and the change moment of the collected fluid pressure value; the target pump is controlled to operate based on the rotating speed indicated by the rotating speed adjusting signal to adjust the output flow of the target pump, so that the adjusted pressure value is close to the reference pressure value; wherein the pressure control parameter is obtained by performing simulation calculation on a hysteresis relation based on an inertia time constant and pressure wave propagation delay time of the fluid at the outlet of the target pump.

The invention relates to the technical field of detectors, in particular to a detector for detecting the interior of a buried polyethylene gas pipe and a detection method thereof.The detector comprises a body of a capsule-shaped structure on the whole, and the body comprises a speed control mechanism, an acoustic detection mechanism, an auxiliary movement mechanism and a communication mechanism which are sequentially arranged in the axial direction; the acoustic detection mechanism is used for collecting sound signals in a pipeline, the auxiliary movement mechanism is used for making contact with the inner wall of the pipeline and sealing the inner wall of the pipeline, so that pressure difference is formed between the front portion and the rear portion of the body, and the body is driven to move in the pipeline. The opening degree of the air inlet is controlled in cooperation with the opening degree adjusting mechanism, the displacement speed of the body in the pipeline is controlled, sound in the pipeline is collected through the acoustic detection mechanism, rapid pipeline detection is achieved, the detection efficiency of the buried pipeline is improved, the omission ratio is reduced, and the situation that existing manual detection wastes time and labor is avoided, and the omission ratio is high is avoided.

The invention relates to the technical field of turbocharger experiments, in particular to a turbocharger surge experiment device which comprises a first branch pipe, a second branch pipe, a surge tank and an exhaust pipe, a vortex shedding flowmeter and a first flow adjusting valve are arranged on the exhaust pipe, and the two sides of the exhaust pipe are connected with the first branch pipe and the second branch pipe respectively. A surge relief valve is arranged on a pipeline of the first branch pipe, a second flow regulating valve is arranged on a pipeline of the second branch pipe, a flow limiting valve is arranged at one end of the pressure stabilizing tank, a pressure difference transmitter is arranged at the other end of the pressure stabilizing tank, the flow limiting valve is connected to a pipe section in front of the vortex shedding flowmeter through a connecting pipe, and a three-way connector is arranged on a pipeline of the connecting pipe. And the three-way joint is connected to the pressure difference transmitter through a pipeline at one end. The test device not only can simulate the surge generation condition of the turbocharger, but also can test the surge bearing limit of the turbocharger, and ensures smooth research and development of the turbocharger.

The invention provides a fluidized bed control method, device and equipment and a storage medium, and the method comprises the steps: collecting a real-time temperature, a first pressure difference and a second pressure difference of a fluidized bed, the first pressure difference being a real-time pressure difference between an upper measurement point and a lower measurement point, which are different in preset height, of the fluidized bed, and the second pressure difference being a real-time pressure difference between the upper measurement point and the lower measurement point; the second pressure difference is a real-time pressure difference between the high-pressure stock bin and the fluidized bed; according to the first pressure difference and the second pressure difference, a cascade control method is used for determining control parameters of a pressure supplementing valve on the pressure adjusting pipe; the opening degree of the pressure supplementing valve on the pressure adjusting pipe is adjusted based on the control parameters of the pressure supplementing valve; according to the real-time temperature, determining a power parameter of the heater by using a cascade control method; and controlling the heating power of the heater based on the power parameter. And the fluidized bed pressure difference and the fluidized bed reaction temperature can be accurately controlled.

The invention discloses an intelligent positioning method for a TBM disassembly supporting tool, and the method comprises the steps: installing laser ranging sensors at four corners of a supporting tool frame, forming space projection mapping with a shield body four-quadrant reflection target, collecting target distance data, comparing the target distance data with a pre-stored shield body theoretical axis model, and calculating a deviation value; the controller converts the axial deviation into a hydraulic cylinder stroke instruction to drive the four supporting hydraulic cylinders to conduct cooperative adjustment, when the pressure sensor monitors that the pressure difference exceeds 0.8 MPa, the compensation amount is recalculated, and historical ovality data is called to calculate an inclination angle correction value; the double-inclination-angle adjusting oil cylinder is controlled for compensation and secondary verification, and if the radial deviation range is exceeded, adjustment is returned; after three times of cross validation are completed, a hydraulic cylinder self-locking mechanism and a positioning pin are locked, positioning parameters are encrypted and stored, and a completion signal is triggered. The method is used for improving the positioning precision and efficiency of shield tunneling machine disassembling operation, effectively reduces the contact damage risk between the supporting tool and the shield body, and is particularly suitable for large shield tunneling machine disassembling engineering with the diameter larger than 8 m.

The invention belongs to the field of aircraft structure design, and particularly relates to a self-system frame stabilizing buffer which comprises a moving floating plug, a buffer outer cylinder, a movable floating plug, a support and a piston rod. The buffer outer cylinder is in a sleeve form and is open at two ends; an outer cylinder joint and an end cover nut are respectively arranged at two ends of the buffer outer cylinder; the support is arranged between the buffering outer cylinder and the end cover nut, and is clamped and fixed by the end cover nut and the end surface of the outer cylinder; nitrogen is sealed in the high-pressure air cavity and has certain pressure, pressure for stabilizing the buffer is provided through the high-pressure air cavity and acts on the movable floating plug and the piston rod at the same time, the stable buffer is located at the neutral position through the pressure difference, and position control over the frame is achieved. When the piston rod of the stable buffer is passively stretched, oil is discharged from the first oil cavity of the piston rod, then the oil flows to the second oil cavity to form certain damping, and when an airplane skates on the ground and a frame is disturbed, the frame is quickly recovered to be neutral through the damping, so that the function of suppressing vibration of the frame is achieved.

An arrangement for operating a load-controlled hydraulic system of an agricultural tractor, includes a hydraulic pump generating a system pressure and having an actuating device to adjust a displacement volume, a hydrostatic vehicle steering system connected to the hydraulic pump and having a steering orbitrol and a first load-indicating pressure, a pressure-regulating valve connected upstream of the steering orbitrol and actuated via a pressure difference decreasing across a throttle element counter to a predetermined restoring force in accordance with the first load-indicating pressure, a second hydraulic consumer connected to the hydraulic pump and feeding a second load-indicating pressure back to a shuttle valve arrangement, which compares and transmits the respectively higher of the first and second load-indicating pressures to the actuating device to adjust the displacement volume, and a pressure-copying valve indirectly feeding back the first load-indicating pressure to the shuttle valve arrangement.

This refrigeration cycle device comprises: a refrigerant circuit; a low-pressure sensor; and a control device. The refrigerant circuit includes a compressor. The low-pressure sensor measures a low pressure, which is the pressure of a refrigerant sucked into the compressor. In a start-stop repetition period, which is a period during which the compressor repeats starting and stopping, the control device executes an upper limit adjustment process for adjusting an upper limit operation frequency of the compressor in a first period, which is a period until the compressor stops after starting. If a first reduction condition and a second reduction condition are satisfied, the control device reduces the upper limit operation frequency in the first period to below an upper limit operation frequency in the preceding period in the start-stop repetition period. If the number of executions of upper limit reduction control reaches a threshold number, the control device stops the upper limit reduction control, such that the upper limit operation frequency in the first period is equal to the upper limit operation frequency in the preceding period. The preceding period is a period from the starting to the stopping of the compressor immediately before the first period. The first reduction condition is a condition that the speed of change of the low pressure in the preceding period is at least a first pressure change speed. The second reduction condition is a condition that the low pressure in the preceding period falls below a target low pressure, and the absolute value of the difference between the low pressure in the preceding period and a target low pressure is greater than the value of a first pressure difference.

The invention belongs to the technical field of electromagnetic valve shock absorbers, and discloses a novel damping-force-controllable double-electromagnetic-valve shock absorber which comprises a sealing opening and an electromagnetic valve-restoring assembly, the sealing opening is connected to the inner surface of the left end of an oil storage cylinder assembly in a sealed mode, an oil seal is attached to the right end face of the sealing opening, and a guide seat is attached to the right side surface of the oil seal; when current is low, the end cap is located in the middle, the closure area is large, the safety valve is in an open state, the closure area is increased, the pressure difference between the oil cavity P and the oil cavity P generates low-speed damping force, the pressure difference between the oil cavity P and the oil cavity P is increased, the sealing valve plate is easy to open, and the oil cavity P and the backflow valve seat generate high-speed damping force; when current is increased, the end cap is located at the lowermost end and makes contact with the upper end of the backflow valve seat, the closure area is minimum, the pressure difference between the oil cavity P and the oil cavity P generates low-speed damping force, the pressure difference between the oil cavity P and the oil cavity P becomes small, the sealing valve plate is difficult to open, and therefore the oil cavity P and the oil cavity P generate high-speed damping force.

The invention relates to the technical field of well leakage prevention and treatment, in particular to a mud hanging and filling amount calculation method based on annulus liquid level monitoring, which comprises the following steps: establishing a relation model of leakage rate and liquid level height in the drilling fluid leakage process, predicting the position of a leakage balance point, and calculating the leakage pressure difference of each measuring point; establishing a relation model of the leakage pressure difference and the leakage rate, and determining a leakage dynamic function; calculating the liquid level height required to be compensated for the drill tool deficit of the lifting drill; calculating a liquid level height required for balancing formation high pressure, and determining a safe liquid level height; and calculating the time from the current liquid level height to the safe liquid level height to obtain the slurry hoisting and filling amount. By means of the liquid level monitoring technology, the reasonable slurry hanging and filling amount is calculated, calculation parameters are easy to obtain, the process is simple and convenient, and important technical guarantee is provided for well control safety and well leakage treatment measure optimization.

The invention discloses a high-pressure gas high-flow rapid filling connector controller and method.The controller comprises a gas inlet connector pipe, a main valve element set and a movable valve element set are installed in the gas inlet connector pipe, and a main sealing seat is installed in the gas inlet connector pipe; the main valve element set is provided with a valve element main flow channel and a gas channel. The movable valve element set is movably arranged at one end of the main valve element set in a sleeved mode, a main valve sealing gasket is installed on the movable valve element set, and the flow of the gas channel is controlled through the contact degree of the main valve sealing gasket and the main sealing seat. The movable valve element set is provided with a pilot flow channel, the pilot flow channel guides pilot gas to flow in the direction away from the main sealing seat and then converge into the valve element main flow channel, and the pilot gas is a part of gas shunted to the front of the main valve element set from the gas inlet connector pipe. After the valve element is improved, the first flow guide channel is utilized, and by means of the pressure difference between the two ends of the valve element, a worker is assisted in controlling high-pressure gas.

The invention discloses a pressure-balanced floor drain, and relates to the technical field of floor drains. The technical scheme thereof is as follows: the floor drain comprises a cylinder and a reset device, wherein the upper end of the cylinder is a water inlet, the lower end of the cylinder is a water outlet, the reset device is arranged at the lower end of the cylinder, a sealing cover is arranged between the reset device and the cylinder, the reset device can apply a pre-tightening force to the sealing cover, so that the sealing cover is close to the water outlet and seals the water outlet, a stroke chamber is arranged on the sealing cover, a through hole 1 connected to a sewer pipe is arranged below the stroke chamber, a through hole 2 connected to the outside is arranged above the stroke chamber, a floating member is arranged in the stroke chamber, and the floating member can seal the through hole 1 by its own gravity. The floating member rises under the action of the air pressure difference, so that the air pressure of the lower sealing section is the same as or close to the outside air pressure, so as to ensure that the sealing cover can move up and down normally, and achieve the purpose of relatively smooth discharge of accumulated water at the water inlet.

The invention relates to the technical field of balance valves, and discloses a load compensation balance valve which comprises a balance valve body and an adjusting nut, a locking cap is in threaded connection with the outer arc surface of the adjusting nut, the right side of the locking cap is in contact with a main valve element spring, and the end, away from the locking cap, of the main valve element spring is in contact with a tip cone. The function of a one-way valve of one balance valve element assembly is canceled, so that oil inlet from a V port to a C port depends on the pressure of a control oil port and generates driving pressure through a throttling network composed of a specific throttling hole, the one-way valve and a bypass throttling hole, and the other balance valve element assembly obtains the driving pressure equal to the pressure of the control oil port through an independent throttling hole. A pressure difference is formed to realize sequential opening of the two assemblies; the linkage logic inhibits the jitter of the multiple feedback system under the negative load, stabilizes the falling speed of the arm support, and avoids the risk of overturning of the whole machine caused by the dynamic load.

The invention discloses a digital hydraulic pump controlled by a high-speed switch valve bridge. The digital hydraulic pump comprises a motor, a swash plate type axial plunger pump, a variable adjusting unit, a pressure compensation unit, a closed-loop control unit, an unloading unit and a filter. The motor is connected with the swash plate type variable displacement piston pump; the variable adjusting unit is connected with the swash plate type variable plunger pump; the pressure compensation unit is connected with the variable adjusting unit to carry out differential pressure compensation on the variable adjusting unit; the closed-loop control unit is connected with the variable adjusting unit and controls the output flow of the variable adjusting unit according to a feedback signal; the high-speed switch valve is subjected to pressure difference compensation through the pressure difference compensator, so that the flow of the high-speed switch valve is not affected by load changes any more, and output pressure fluctuation of the swash plate type variable displacement piston pump is reduced; a high-speed switch valve bridge serves as a pilot level, and digital accurate control over the output pressure of the hydraulic pump is achieved through a closed-loop control unit; the high-speed switch valves are connected in parallel, multi-stage flow output and differential flow control are achieved, and the control precision and the response speed of the digital hydraulic pump are improved.

The invention relates to the technical field of hydraulic valves, and discloses a high-water-base large-flow digital proportional valve which comprises a valve seat unit. By adjusting the pressure of the control cavity K1 and the pressure of the control cavity K2, a certain pressure difference is formed between high-water-base hydraulic media in the control cavity K1 and the control cavity K2, so that the high-water-base hydraulic media can push a low-pressure side pushing check ring or a high-pressure side pushing check ring to move, the low-pressure side pushing check ring or the high-pressure side pushing check ring can drive a push rod to move, and the low-pressure side pushing check ring or the high-pressure side pushing check ring can push the high-pressure side pushing check ring to move. Therefore, the high-pressure side cone valve element or the low-pressure side cone valve element can be driven to move synchronously, when the high-pressure side cone valve element moves, the high-pressure side cone valve element can be matched with a reset spring to press the low-pressure side cone valve element, and when the low-pressure side cone valve element moves, the low-pressure side cone valve element can be matched with the reset spring to press the high-pressure side cone valve element. Due to the fact that the push rod is in separated drive with the high-pressure side cone valve element and the low-pressure side cone valve element, the three-position three-way O-shaped full-proportion control valve with the meso-position function is achieved, accuracy of flow control is guaranteed, and hydraulic impact is avoided.

The embodiment of the invention discloses an anti-surge control method and device for a compressor, the compressor, a storage medium and a program product. Wherein an inlet pressure measuring module and an inlet regulating valve are arranged on the gas inlet side of the compressor, and an outlet pressure measuring module and an outlet regulating valve are arranged on the gas outlet side of the compressor; the method comprises the steps that the current inlet pressure, measured by an inlet pressure measuring module, of a compressor and the current outlet pressure, measured by an outlet pressure measuring module, of the compressor are obtained, and the current pressure difference of an inlet and an outlet of the compressor is calculated; comparing the current pressure difference with a set pressure difference threshold value to obtain a regulation and control parameter; determining a current control interval from a predetermined split-range control model based on the regulation and control parameters; and on the basis of the current control interval, opening control is conducted on at least one of the inlet adjusting valve and the outlet adjusting valve. According to the technical scheme, the surge risk of the compressor can be effectively reduced.

The invention provides a variable rotating speed-variable displacement differential pressure controllable valve front compensation load sensitive system. The variable rotating speed-variable displacement differential pressure controllable valve front compensation load sensitive system comprises a control unit, a driving motor assembly, a variable differential pressure load sensitive pump assembly, a variable differential pressure load sensitive valve assembly, a pilot hydraulic control unit, a pilot handle assembly, an actuator assembly, a sensor assembly and a motor rotating speed control module. The driving motor assembly drives the variable pressure difference load sensitive pump assembly to supply oil to the variable pressure difference load sensitive valve assembly, and then the actuator assembly is driven to operate. The pilot hydraulic control unit provides set pressure; the pilot handle assembly outputs a signal to the variable pressure difference load sensitive valve assembly; the sensor assembly detects the maximum load pressure of the system and the outlet pressure of the variable pressure difference load sensitive pump assembly; the control unit controls the target rotating speed of the driving motor assembly and the control pressure of the pilot hydraulic control unit. Compared with an existing upstream compensation load sensitive system, the problem of speed imbalance of an actuator under the flow saturation working condition is effectively avoided, and the control performance is remarkably improved.

The invention relates to the field of water quality monitoring, in particular to a water area environment water quality on-line intelligent monitoring device and method, and the water area environment water quality on-line intelligent monitoring device comprises a shell, a defoaming mechanism and a monitoring mechanism; a water inlet and a water outlet are formed in the shell, and a water flow channel is formed in the shell; a water inlet valve is mounted at the water inlet; the defoaming mechanism comprises a negative pressure cylinder arranged in the shell and a piston assembly arranged in the negative pressure cylinder; the piston assembly moves upwards to suck the water flow channel to negative pressure, bubbles in water flow are promoted to be separated out, the pressure difference between the two sides of the water inlet valve is increased, and the water flow is promoted to enter the water flow channel through the water inlet valve. The opening threshold value of the water inlet valve is adjusted according to the gas amount in the water flow, so that new water flow enters from the water inlet valve when the piston assembly sucks the water flow channel till the absolute value of the negative pressure is large enough, and the separation effect of bubbles in the original water flow and the new water flow in the water flow channel is guaranteed. And the water quality monitoring accuracy of the monitoring mechanism is improved.