2308 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 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 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 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 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 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 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.

The invention relates to the technical field of valves, in particular to a high-pressure-resistant quick opening and closing flat valve which comprises a valve body, a first valve seat, a second valve seat, a valve plate and a valve rod. The first valve seat and the second valve seat are arranged in a medium channel of the valve body, the valve plate is arranged between the first valve seat and the second valve seat in a sealing and sliding mode, and the valve rod is in driving connection with the valve plate. The middle of the valve rod is slidably connected to a valve deck in the middle of the top of the valve body, the hand wheel driving mechanism is connected to the upper portion of the valve deck, a pressure relief pipeline is arranged on the valve body, and the two ends of the pressure relief pipeline are communicated with a high-pressure side cavity, back to the valve plate, of the first valve seat and a low-pressure side cavity, back to the valve plate, of the second valve seat respectively. The pressure relief pipeline is provided with a pressure relief control valve used for controlling connection and disconnection of the pressure relief pipeline. The pressure difference generated by high-pressure fluid on the two sides of the valve plate can be balanced before the valve plate is opened, the main factor causing huge operation torque is fundamentally eliminated, opening and closing of the valve plate are extremely labor-saving and rapid, and rapid opening and closing under the high-pressure working condition are achieved.

According to the impact-cutting composite rock breaking hydraulic system and method for the mining heading machine, hydraulic damping and impact hammer collaborative operation are integrated, and the problems that a traditional heading machine is low in rock breaking efficiency, poor in stability and insufficient in adaptability are solved. The system comprises a cutting arm hydraulic damping system and an impact hammer hydraulic impact system, and multi-parameter closed-loop regulation and control are achieved through a controller. The device is characterized in that a double overflow protection mechanism is adopted, a proportional overflow valve and an external control overflow valve cooperate with each other, a hydraulic control one-way valve is combined for compensating an oil path, and the pressure difference of a hydraulic cylinder is dynamically kept stable; the impact hammer system adjusts the pressure of an energy accumulator through a proportional pressure reducing valve and is matched with a hydraulic control switch valve to realize variable impact energy control; based on feedback of a vibration sensor and a pressure sensor, damping and impact parameters of the cutting arm are adjusted in a self-adaptive mode through a nonlinear algorithm, and intelligent rock breaking operation under different rock stratum hardness is achieved. According to the system, the impact resistance stability, the rock breaking efficiency and the operation intelligence level of the heading machine are remarkably improved.

The invention discloses a digital hydraulic system and a control method. The system comprises a digital hydraulic valve, at least one hydraulic pump assembly and a controller. The digital hydraulic valve comprises at least one working unit, and each working unit comprises a main valve, a front differential pressure compensator and a pilot driving module used for driving and controlling the position of a valve element of the main valve. The differential pressure compensator adopts electric proportional control; the pilot driving module comprises a valve element displacement sensor used for detecting the actual displacement of a valve element of the main valve. The hydraulic pump assembly comprises a hydraulic pump, a variable displacement mechanism, a lead screw and a servo motor, the servo motor converts rotary motion into linear motion through the lead screw to directly control the variable displacement mechanism, and displacement control over the hydraulic pump assembly is achieved. An outlet of the hydraulic pump is connected to an inlet of the differential pressure compensator, an outlet of the differential pressure compensator is connected to an inlet of the working linkage main valve, and a working opening of the working linkage main valve is connected with the oil cylinder or the motor. And the servo motor, the differential pressure compensator and the pilot driving module are respectively in signal connection with the controller.

The invention provides an excavator crushing working condition double-pump flow matching method, device, medium and system. Under the condition that the excavator carries out crushing working condition operation, the pressure difference between the auxiliary pump and the main pump is obtained, and a first pressure difference is obtained; under the condition that the first pressure difference is smaller than a pressure difference threshold value, a current control signal of the auxiliary pump is gradually increased; under the condition that the current control signal of the auxiliary pump is increased every time, the pressure difference between the auxiliary pump and the main pump is obtained again, and a second pressure difference is obtained; and under the condition that the second pressure difference is larger than or equal to the pressure difference threshold value, the current control signal of the auxiliary pump is kept the same as the current control signal of the auxiliary pump at the current moment under the current crushing working condition. The problem that the confluence effect of two hydraulic pumps in an existing scheme is sometimes affected by volume efficiency difference and abrasion failure of the hydraulic pumps under different boundary conditions, so that the flow of an auxiliary pump cannot be converged with a main pump through a confluence one-way valve, and the crushing operation effect is affected is solved.

The invention is suitable for the technical field of flat gate valves, and particularly relates to a method for testing the sealing performance of a flat gate valve under a high-pressure-difference working condition. Wherein the pressure difference information comprises a plurality of pieces of opening difference information; obtaining analysis information based on the pressure difference information; wherein the analysis information comprises opening degree analysis information and service life prediction information; obtaining a test report based on the analysis information; wherein the test report reflects the sealing performance of the flat gate valve. According to the method for testing the sealing performance of the flat gate valve under the high-pressure-difference working condition, the situation that the contact pressure of the sealing surface is possibly smaller than the fluid pressure difference of the two sides of the gate plate in the high-pressure-difference working condition and in the environment where the flat gate valve needs to be frequently opened and closed, and consequently macroscopic leakage or microscopic leakage is caused can be improved; and high-speed jet flow generated when a medium passes through a sealing surface gap is easy to cause cavitation abrasion, so that the sealing performance of the gate valve is influenced.

The present invention relates to a monitoring method and a monitoring device that can be used during a medical treatment of a patient (Pt). A patient-fluid guide unit (32, 33) is established between the medical device (1) and the patient-side coupling unit (21). The gas sample (Gp) diverges from the patient-fluid conducting unit at a diverging point (34) and is conducted to the sensor assembly (50). The sensor assembly measures a portion of a component of the gas sample. It is determined whether an indicator (L) for a leak between the bifurcation point and the measurement position in the sensor assembly occurs. The route from the bifurcation point to the measurement position is divided into at least two sections. For each section, an aerodynamic resistance is specified, which is dependent on the volumetric flow through the section. If an indicator for a leak is found, which section the leak occurs is identified. The aerodynamic resistance and the pressure difference (Pcell-Paw) between the bifurcation point and the measurement point are used for this purpose.

The invention relates to the technical field of transformers, in particular to a transformer with a high-frequency magnetic material. Comprising a transformer body, a lower base and an upper base, a cooling fan is arranged on the upper base on one side of the transformer body, a liquid cooling system is arranged on the transformer body, and a trigger mechanism is arranged at the top of the transformer body and used for controlling starting and stopping of the cooling fan and the liquid cooling system according to temperature changes in the transformer body. Under the action of the bent end and the first wedge block, the bent end slides along the inclined plane of the first wedge block, the air inducing plates on the two sides rotate clockwise and anticlockwise respectively and overcome the elastic potential energy of the reset spring, and as the rotation amplitude of the air inducing plates is increased, the distance between the air flow channels between the air inducing plates and the transformer body is reduced, and the air flow is discharged. And airflow flowing through the airflow channel can quickly pass through the airflow channel, so that more heat on the leeside can be taken away by utilizing the pressure difference, and heat dissipation on the leeside of the transformer body is facilitated.

This hydraulic drive device drives a plurality of hydraulic devices including at least first to third hydraulic devices by supplying a working fluid to each of the plurality of hydraulic devices, and includes: a plurality of pumps including at least first and second pumps respectively connected to the first and second hydraulic devices; a merge passage that is connected to the plurality of pumps and in which streams of the working fluid discharged from the plurality of pumps join together; a flow rate control valve that is connected to the merge passage and the third hydraulic device and controls the flow rate of the working fluid flowing from the merge passage to the third hydraulic device by adjusting the opening degree of the flow rate control valve according to an input flow rate control signal; and a pressure compensation valve that is provided on the third hydraulic device side relative to a merge point at which the streams of the working fluid join together in the merge passage and maintains the upstream-downstream pressure difference of the flow rate control valve at a predetermined pressure.

The application relates to the technical field of well drilling, and is a motor control type variable-diameter stabilizer, which comprises a variable-diameter mechanism, a pressure driving mechanism, a non-magnetic drill collar, a control outer shell and a variable-diameter joint which are sequentially and threadedly connected together from top to bottom, the variable-diameter mechanism comprises a righting block which is slidingly installed in an installation sliding groove, the variable-diameter joint is provided with a limiting ring, a reset spring is arranged between the installation sliding block and the limiting ring, the variable-diameter joint is provided with a plurality of sinking grooves, a piston is arranged in each sinking groove, the variable-diameter joint is provided with a liquid storage channel, a communication hole which is in communication with the liquid storage channel is arranged on the inner side wall of each sinking groove, the control outer shell is internally provided with the pressure driving mechanism, the non-magnetic drill collar is internally provided with a control system, and the pressure driving mechanism is electrically connected with the control system. The application has the advantages of reasonable and compact structure, convenient use, safety, labor saving and high efficiency, and the righting block is controlled by forming a pressure difference at the variable-diameter joint and extending.

The invention discloses a design method of a pressure control throttle valve with the pressure drop linearly changing along with the stroke, and belongs to the technical field of automation of oil and gas exploitation equipment.The design method comprises the following steps that the linear relation between the pressure drop and the stroke of the throttle valve serves as a target; a mathematical model of a valve element contour is established by establishing a minimum throttling area equation of a cylindrical valve and a wedge-shaped valve, correcting a flow pressure drop characteristic equation and deducing a differential pressure linear adjustment equation, a valve element contour curve meeting the linear requirement is deduced through variable-diameter contour optimization design, and therefore the valve element structure of the throttling valve is obtained. By means of the design method, the valve element contour curve with the wider linearity range of pressure control adjustment and the better precision can be obtained, and the design method is more efficient and universal.

The utility model relates to the technical field of springs, in particular to a piston balance valve structure and a gas spring, and aims to solve the problem that a common gas spring cannot stay at any position. The piston balance valve structure comprises a cylinder barrel and a valve element, the valve element is inserted into the cylinder barrel, and a first cavity and a second cavity are formed in the two ends of the valve element respectively. The valve element comprises a piston body, a sliding sleeve and a reset spring. The sliding sleeve is sleeved on the piston body; the reset spring is used for applying elastic force to the sliding sleeve; the piston body is provided with a first passage, the sliding sleeve is provided with a second passage, the first passage is communicated with the first cavity, and the second passage is communicated with the second cavity. The valve element moves towards the first cavity to enable the first cavity and the second cavity to generate pressure difference so as to push the sliding sleeve, then the first channel and the second channel are communicated, the elastic force of the reset spring enables the first cavity and the second cavity to generate pressure difference and balance the elastic force, meanwhile, the pressure difference acts on the section of the cylinder barrel to balance loads, and residence at any position is achieved.

The invention relates to the technical field of water source heat pump adjustment, and discloses a dynamic pressure difference compensation system and method for a heat supply network, and the method comprises the following steps: obtaining a topological structure and a flow-pressure difference curve of each main pipeline in the heat supply network; establishing a thermal inertia model for each main pipeline; generating a fuzzy rule base of the main pipeline based on the topological structure, the flow-pressure difference curve and a thermal inertia model; determining control parameters of a main pipeline based on the fuzzy rule base; the actual pressure difference and the target pressure difference of the main pipeline are obtained; based on the actual pressure difference, the target pressure difference and the control parameters, the flow adjusting amount of the main pipeline is calculated; adjusting a water pump and a valve of a heat supply pipe network based on the flow adjusting quantity; according to the method, the problem of the heat supply network in the aspect of dynamic pressure difference compensation is solved, and quick response and energy consumption control of pressure difference compensation are both considered.

The invention relates to the technical field of gate valve control systems, and discloses a pilot gate valve intelligent control system for a hydraulic valve, which comprises a valve body, and the valve body comprises a main valve clack, a hydraulic cavity, a pilot valve assembly, an intelligent control unit, a multi-source sensor, a human-computer interaction interface and a cloud server. According to the pilot gate valve intelligent control system for the hydraulic valve, a valve operation digital mirror image is built through the multi-source sensor set, the pressure sensor captures the pressure difference of a main valve, a reference is provided for water hammer suppression and the like, the electromagnetic flowmeter conducts non-contact measurement and adapts to multiple media, abrasion errors are avoided, and the magnetostriction displacement sensor monitors valve clack micro-motion; the vibration sensor carries out early warning on hidden dangers such as sealing abrasion through three-axis data, the temperature sensor corrects interference of fluid characteristics on control, the five sensors work cooperatively, all-directional monitoring of fluid parameters and mechanical states is achieved, data are accurately input for intelligent control, and efficient and stable operation of the valve is guaranteed.

The automobile seat front-back adjusting waist rest structure comprises a foundation bottom plate, a limiting rod is arranged on one side of the foundation bottom plate, a displacement mechanism is arranged at the center of the outer wall of the limiting rod, a control unit is arranged on one side of the displacement mechanism, a displacement plate is arranged on one side of the displacement mechanism, and a connecting through hole is formed in the outer wall of the displacement plate. The displacement plate is connected with the foundation bottom plate through the combination of the connecting through holes and the limiting rods, a fixed waist rest is arranged on one side of the displacement plate, a non-contact capacitive sensing array is arranged on the outer wall of the fixed waist rest, and the non-contact capacitive sensing array is arranged on the outer wall of the fixed waist rest through cooperative control of the four-dimensional limiting rods and the sliding rail displacement mechanism. Dynamic fitting of a waist supporting curved surface is achieved by combining a pressure distribution standard deviation algorithm, a spring steel plate composite displacement mechanism can be compatible with installation of seats of various vehicle types, meanwhile, the pressure difference of the upper waist, the middle waist and the lower waist is monitored in real time, millimeter-level displacement adjustment is triggered, and the driving comfort is remarkably improved while driving safety is guaranteed.

The invention discloses an overflow valve with an overpressure protection function, and belongs to the technical field of overflow valves, the overflow valve comprises a valve body, an oil inlet and an oil outlet are formed in the valve body, a communication cavity is formed in the valve body, a valve core is sleeved in the communication cavity, a damping hole is formed in the valve core, and a pressure plug is arranged in the valve body. When the damping hole is blocked, the driving block is driven by the up-down pressure difference of the valve element to extend out at a constant speed, the rotating rod and the threaded strip are driven to do multidirectional compound motion such as forward rotation, ascending, descending and reverse rotation in the damping hole, the shearing effect of full-circumferential covering is generated in the damping hole, sediments in the damping hole are cut and refined, and the damping effect is improved. Turbulent flow accelerated conveying is matched, secondary sedimentation is avoided, the efficient dredging effect on the damping hole is achieved, the vertical pressure difference of the valve element is eliminated in time, oil way pressure is responded and unloaded in time through the pilot valve, and damage to a mechanical structure caused by too large pressure is avoided.

The invention relates to a variable load leakage and deformation controllable mechanical sealing device, and belongs to the technical field of mechanical sealing.The variable load leakage and deformation controllable mechanical sealing device comprises a shaft sleeve, a shell, a first mechanical sealing mechanism and a second mechanical sealing mechanism, and the shell is provided with a lubricating liquid inlet and a lubricating liquid outlet; the first mechanical sealing mechanism is arranged between the shaft sleeve and the shell, the second mechanical sealing mechanism is arranged between the shaft sleeve and the shell, a liquid cavity is defined by the first mechanical sealing mechanism, the shaft sleeve, the shell and the second mechanical sealing mechanism, and the lubricating liquid inlet and the lubricating liquid outlet are both communicated with the liquid cavity. The pressure of lubricating liquid entering from the lubricating liquid inlet is dynamically changed, the pressure of the lubricating liquid is always larger than the pressure of a medium in the circulating pump, and the pressure difference is within a preset range. The mechanical seal has the advantages that the use effect of the mechanical seal is effectively guaranteed under the condition that the medium pressure in the circulating pump changes, and the mechanical seal can be suitable for the high-pressure variable-load working condition.

The invention discloses an online high-precision pose measurement and control method and system for a vertical shaft heading machine, relates to the technical field of vertical shaft construction, and solves the problems that factors considered by an existing pose measurement and control method are not comprehensive enough, the deviation correction amplitude cannot be flexibly adjusted according to the deviation, and the pose change of the heading machine after adjustment cannot be predicted. According to the technical scheme, the method is characterized in that displacement deviation, displacement deviation variable quantity, angle deviation and angle deviation variable quantity of a heading machine pose and a target pose are obtained through a pose measuring system, the deviations are decomposed into XOZ and YOZ planes and input into a combined fuzzy controller of the corresponding planes, and the pressure difference of a supporting oil cylinder and a hydraulic cylinder is obtained; constructing an input feature sequence based on the pressure difference of the supporting oil cylinder and the hydraulic cylinder, inputting the input feature sequence into a pose prediction model based on a neural network, and predicting the displacement deviation and the angle deviation of the heading machine in a future time period, so as to predict the pose change of the heading machine after the pressure difference of the supporting oil cylinder and the hydraulic cylinder is adjusted; the problems are solved.

The invention provides a labyrinth sealing structure, and belongs to the technical field of gas turbine and engine sealing, the labyrinth sealing structure specifically comprises a labyrinth disc and a sealing ring, a rotor assembly and the labyrinth disc are coaxial and fixedly connected, a plurality of labyrinth teeth protruding towards a stator assembly are arranged on the peripheral side face of the labyrinth disc, the sealing ring is arranged between any two adjacent labyrinth teeth in a sleeving mode, and the labyrinth teeth are arranged in the labyrinth disc. The sealing ring is of a hollow and internally-closed structure, when the rotating speed of the rotor assembly is smaller than or equal to the first rotating speed, the sealing ring abuts against the labyrinth and the stator assembly, and a gap between the labyrinth and the stator assembly is sealed through the sealing ring; when the rotating speed of the rotor assembly is larger than the first rotating speed, dynamic pressure sealing is formed between the labyrinth and the stator assembly through the pressure difference of the air inlet side and the air outlet side of the labyrinth, the side, facing the stator assembly, of the sealing ring is sunken towards the interior of the sealing ring, and the sealing ring is separated from the stator assembly. According to the treatment scheme, the service life of the labyrinth sealing structure is prolonged.

The invention relates to the field of material conveying, in particular to an automatic deviation adjusting device for a conveying belt, which comprises a rack which is horizontally arranged and is used for bearing the conveying belt, the pressure detection unit comprises two rows of pressure detectors which are symmetrically arranged in the width direction of the conveying belt; the double-row inclined conveying rollers are symmetrically mounted on the rack through supports with rotation dampers and are attached to the lower surface of the conveying belt; the adjustable supporting assembly comprises an ejector block arranged on the conveying rollers in a sliding mode. The control unit is electrically connected with the pressure detection unit and comprises a comparison module and a signal output module; when the comparison module detects that pressure difference is generated on the two sides of the same position of the conveying belt, the signal output module sends driving signals to the adjustable supporting assemblies corresponding to the sides with the small pressure, and the ejector blocks are promoted to stretch out of the surfaces of the conveying rollers. The deviation adjusting device has the effect of solving the problem of lag of a deviation adjusting response mechanism of an existing deviation adjusting device.

The invention provides a shale gas well inter-well pressure channeling identification method, system, device and medium, the shale gas well inter-well pressure channeling identification method comprises the following steps: carrying out well test analysis in a pump stop pressure drop stage after fracturing, and collecting data; the bottom hole pressure is calculated, and pressure data oscillation caused by the water hammer effect is eliminated; drawing a pressure difference and pressure difference derivative double logarithmic curve based on the bottom hole pressure data; establishing a shale gas well non-uniform fracture multi-zone coupling well test seepage model; the model parameters are adjusted, a pressure difference and pressure difference derivative double logarithmic curve is fitted, and when the model result is close to the drawn pressure difference and pressure difference derivative double logarithmic curve, the crack parameters of the model parameters are obtained through inversion; judging whether the crack parameter is too high or not; and determining the relationship between the child well group and the mother well group, analyzing the pressure difference and pressure difference derivative curve morphological characteristics of the fracture parameter high section, and judging whether pressure channeling occurs or not. The system can realize the method. According to the method, the inter-well pressure channeling identification efficiency in the well group synchronous fracturing period can be improved.