1455 results about "Working pressure" patented technology

The utility model provides a hydraulic type electric double-diaphragm pump which comprises a shell and a driving device, a middle body is arranged in the shell, the two ends of the middle body are connected with a left diaphragm and a right diaphragm respectively, a piston is installed in the middle body, the middle body is divided into a left hydraulic cavity and a right hydraulic cavity by the piston, and the left hydraulic cavity and the right hydraulic cavity are filled with hydraulic media. A left fluid cavity is formed between the left diaphragm and the shell, a right fluid cavity is formed between the right diaphragm and the shell, and the piston reciprocates left and right under the action of the driving device, so that the left fluid cavity and the right fluid cavity are extruded to alternately suck in and discharge liquid. According to the hydraulic type electric double-diaphragm pump, the fluid cavity is formed in one side of the diaphragm, the hydraulic cavity is formed in the other side of the diaphragm, fluid in the hydraulic cavity serves as a medium to push the diaphragm to move, the problem that stress on the two sides of the diaphragm of the electric double-diaphragm pump is unbalanced is solved, the service life of the diaphragm is prolonged, and the working pressure range of the electric double-diaphragm pump is widened. And the application field of the electric double-diaphragm pump is widened.

The invention relates to a method and a system for detecting the sealing performance of a spherical underwater connector. The method comprises the following steps: injecting dry inert gas with the same working pressure into a sealing ring through a pressure measuring hole; 5-15-degree and 0.1-1Hz sinusoidal deflection motion is applied to the sphere, and the dynamic working condition that the underwater pipeline is impacted by ocean current for a long time is simulated through short-term limit periodic deflection motion; meanwhile, the pressure fluctuation amplitude delta P is recorded with the sampling frequency larger than or equal to 10 Hz, the first period delta P0 serves as the benchmark, delta Pn is measured regularly, and a delta P (t) curve is built; and determining a critical threshold value delta Pmax through an experiment, and calculating the duration of increasing the delta P0 to the delta Pmax according to the delta P (t) curve as the predicted service life. Through short-term limit dynamic loading and high-frequency monitoring, real-time state detection and long-term performance evaluation of the sealing ring are achieved, and the problem that sealing performance degradation under alternating stress cannot be predicted through traditional static detection is solved.

The utility model belongs to the technical field of glue supply, and particularly relates to a high-pressure fluid supply device which comprises a bearing base, first power cylinders are fixedly installed above the left end and the right end of the bearing base respectively, an air control box is fixedly installed on the right side wall of the first power cylinder on the right side, and a pressure plate pump is fixedly installed at the top end of each first power cylinder. A second power air cylinder is fixedly installed in the middle of the bottom end of the pressure plate pump, the output end of the second power air cylinder is fixedly connected with a plunger pump, a glue outlet is formed in the front outer wall of the top of the plunger pump, a pressure plate body is fixedly installed at the bottom of the plunger pump, and an exhaust assembly is installed on the upper front portion of the pressure plate body. The whole plunger pump is made of 304 stainless steel materials, has high strength and good corrosion resistance, the maximum working pressure is 440 bar, and the plunger pump is convenient to meet the operation requirement of high-pressure fluid supply.

The invention relates to the technical field of heavy oil thermal recovery, in particular to a multi-element thermal fluid generator system operation control system which comprises a data acquisition module used for acquiring working parameters of a multi-element thermal fluid generator during working, and the working parameters comprise multi-element thermal fluid parameters, working pressure, working temperature, water flow, gas amount and air flow; the trend identification module is used for identifying change trends of the working parameters at different positions, selecting the change trends of the corresponding working parameters according to different types of abnormal states when the working parameters are in abnormal states, and judging fault positions and processing measures of the working parameters according to the change trends; the work adjusting module is used for acquiring the parameter proportion and the distribution quantity of the working parameters according to the fault positions of the working parameters, and setting adjusting factors of the working parameters according to the parameter proportion and the distribution quantity of the working parameters; the stability, reliability and operation efficiency of the system are improved, and the maintenance cost is reduced.

The invention relates to the technical field of petrochemical equipment sealing, in particular to a flange sealing performance evaluation method based on bolt axial stress, which comprises the following steps: establishing a nonlinear stress relationship between a gasket and bolt axial force; establishing a relationship between the axial stress of the bolt and the sealing contact stress of the contact surface of the gasket under different working pressures; constructing a three-dimensional model of a real sealing surface; establishing a three-dimensional model of the sealing surface contact process; obtaining the change of a leakage gap between the contact surfaces under different contact stresses, and establishing a relation model of the leakage gap of the contact interface and the sealing contact stress; establishing a quantitative evaluation model among the sealing contact stress, the leakage clearance and the leakage rate; obtaining the contact stress under the actual working condition, and calculating whether the corresponding leakage rate meets the tightness judgment standard or not so as to judge the sealing state of the flange. The invention aims to solve the technical problem that the metal sealing performance of in-service flange connection cannot be quantitatively and online evaluated in the prior art.

The invention discloses a heavy truck hydraulic retarder control method and system and a vehicle, and belongs to the technical field of retarder control. The method comprises the steps that the target braking torque value of a retarder is read; if the target braking torque value is larger than or equal to the maximum output torque value, the target braking torque value is set to be the maximum output torque value; if yes, the target braking torque value is dynamically compensated; calculating a target working pressure value of the retarder cavity; and the deviation between the target working pressure value of the retarder containing cavity and the current working pressure and the deviation between the proportional valve target and the actual current are calculated, calculation is conducted through a PID controller, and the output serves as the input of the retarder proportional valve so as to control the output torque of the retarder. According to the invention, the output torque delay can be reduced so as to improve the braking performance of the retarder, the braking precision and stability are relatively high, and relatively stable braking can be maintained under the conditions of different vehicle speeds and different oil temperatures.

The utility model discloses a wall-mounted concentrator, which belongs to the technical field of concentrators and comprises a mounting seat and a concentrator body, a rectangular cavity is arranged on the back of the mounting seat, and a clamping component is assembled in the rectangular cavity. The wall-mounted concentrator has the advantages of being convenient to disassemble and assemble, long in service life and capable of reducing the maintenance work intensity, and by means of mutual cooperation of parts in the arranged clamping assembly, workers can rotate the rotating rod clockwise, and the wall-mounted concentrator is convenient to disassemble and assemble, and the maintenance work intensity is reduced. By rotating the rotating rod anticlockwise, one sides of the four clamping plates can move towards one side of the concentrator body and clamp and limit the concentrator body, so that mounting is realized, on the contrary, the concentrator body can be dismounted by rotating the rotating rod anticlockwise, and compared with traditional bolt mounting, the device can enable the concentrator body to be mounted and dismounted more conveniently and quickly, and the mounting efficiency is improved. The maintenance and replacement time is greatly shortened, the maintenance efficiency is improved, and the working pressure of workers is relieved.

The utility model discloses a layered negative pressure flowback plug removal tubular column which comprises an oil tube, a top packer, an interlayer packer, a bottom packer and a backwashing valve are sequentially arranged on the oil tube from top to bottom, and the layered negative pressure flowback plug removal tubular column further comprises a squeezing injection and suction conversion device and a flow channel dividing device. The squeezing, injecting and sucking conversion device is arranged between the interlayer packer and the bottom packer; the flow channel dividing device is arranged in the oil pipe, the upper end of the flow channel dividing device is connected with the top packer, and the lower end of the flow channel dividing device is connected with the squeezing and sucking conversion device. According to the utility model, layered negative-pressure flowback can be realized, differential negative-pressure plug removal tubular column design is carried out according to heterogeneity such as the blockage degree of each layer of a stratum, the tubular column is dragged from bottom to top, negative-pressure plug removal is carried out layer by layer, each layer is completely independent, different plug removal negative pressures are selected according to each layer, and the negative-pressure plug removal pressure is increased for well sections with serious blockage; and the highest unblocking pressure is the rated working pressure of the sleeve.

The utility model relates to the technical field of medical instruments, in particular to a ventilation device for protective clothing. The utility model provides a ventilation device for protective clothing, which can realize circulation and alternate use of internal and external air, reduce the working pressure of a filter tip and prolong the service life of the filter tip. A ventilation device for protective clothing comprises a bonding plate, a dehumidifier, a switching valve, a filter tip and an internal circulation assembly, the dehumidifier is connected to the bonding plate, the switching valve is connected to the left side of the middle of the dehumidifier, the filter tip is clamped to the front side of the middle of the dehumidifier, an exhaust hole is formed in the rear side of the middle of the dehumidifier, and the internal circulation assembly is connected to the dehumidifier. According to the utility model, switching is carried out by controlling the switching valve, damp air in the protective clothing is dehumidified and cooled through the dehumidifier, and treated dry air is conveyed back into the protective clothing through the internal circulation air pipe and the connector, so that internal and external air can be circularly and alternately used, the working pressure of the filter tip is reduced, and the service life of the filter tip is prolonged.

The invention belongs to the technical field of shoe sole waste recycling treatment, and discloses a shoe sole processing waste recycling device which comprises a crushing box, two groups of crushing rollers are rotatably arranged on the inner side of the crushing box, linkage pressure applying assemblies are arranged on the two sides of the crushing rollers, and each linkage pressure applying assembly comprises two groups of limiting guide columns. According to the crushing device, through cooperation of structures such as the linkage pressure applying assembly and the crushing rollers, power can be provided for the pressure applying device when the crushing rollers rotate, it is guaranteed that downward pressure is provided while the crushing rollers rotate, and the crushing efficiency is improved; and therefore, the problems that the normal crushing treatment is influenced due to accumulation or clamping stagnation caused by the fact that rubber cannot be quickly concentrated between the crushing rollers, and the working pressure of workers is greatly increased are effectively solved.

The invention relates to a vacuum chamber for a high-altitude simulation test of a liquid rocket engine, belongs to the technical field of aerospace liquid rocket engine tests, and solves the technical problems of single function, difficulty in operation and poor safety of a traditional vacuum chamber. The cabin comprises a cabin body, a cabin door, a heat sink system, a fire fighting system, a gas replacement system, an anti-arch blasting device, a blowdown system, a mounting platform, an operation platform, a propellant supply pipeline and measurement and control equipment. The cabin body is cubic, and the working pressure in the cabin body is 0-0.1 MPa. The cabin door is used for entering and exiting of personnel, small ground equipment, an engine and a thrust measuring device. The heat sink system, the fire fighting system, the gas replacement system, the sewage discharge system, the mounting platform and the propellant supply pipeline are mounted on the cabin body, and the measurement and control equipment is a transmission channel for engine control and measurement signals. The vacuum chamber is used for a liquid rocket engine high-altitude simulation test.

The utility model discloses an air-blowing type precise high-speed seeding machine, and belongs to the technical field of seeding machinery. Comprising a seeder rack, and more than one air-blowing type precision seeder, a positive pressure generating device, a seeding box, a rotary seed disc driving device and a seed furrow opener are arranged on the seeder rack; the air-blowing type precision seeder comprises a high-pressure side shell, a rotary seed disc, a low-pressure side shell, a high-pressure maintaining structure and a seed discharging structure; the seed metering structure comprises a seed metering pipe and a seed suction hole blocking body; the rotary seed disc is rotationally connected with the high-pressure side shell, the low-pressure side shell is provided with a working pressure relief airflow discharge hole, and the high-pressure maintaining structure and the seed suction hole blocking body are connected with the low-pressure side shell; the high-pressure maintaining structure comprises a low-pressure side shell and a low-pressure side inner shell, the low-pressure side inner shell is rotationally connected with the low-pressure side shell, the seed suction hole blocking body is pressed and attached to the seed release position of the rotation track of the seed suction hole, and the seed suction device has the advantages of being high in working reliability, long in service life, low in maintenance rate, capable of saving energy, reducing consumption and the like.

The invention discloses a method and a system for predicting the residual life of a downhole casing in a full life cycle. The method comprises the following steps: acquiring the working pressure, the internal pressure resistance safety coefficient and the extrusion resistance safety coefficient of a to-be-tested casing; based on the working pressure of the to-be-tested casing, the internal pressure resistance safety coefficient and a pre-constructed first model, obtaining the internal pressure resistance safety service time of the to-be-tested casing; obtaining the anti-extrusion safety service time of the to-be-tested casing pipe based on the working pressure and the anti-extrusion safety coefficient of the to-be-tested casing pipe and a pre-constructed second model; and obtaining the residual life of the to-be-tested casing according to the internal pressure-resistant safe service time and the extrusion-resistant safe service time. By means of the method, life prediction of the shale gas downhole tubular column in the whole life cycle can be achieved, sleeve life prediction is more accurate, and the method has more practical production guiding significance.

A work machine includes a flow control valve that controls the flow rate of a hydraulic operating fluid supplied from a hydraulic pump to a hydraulic cylinder, a solenoid valve that generates an operation pressure for operating the flow control valve, and a controller. The controller executes learning processing of changing in a stepwise manner the operation pressure generated by the solenoid valve, sensing the pressure of the hydraulic cylinder, and storing the operation pressure when the pressure of the hydraulic cylinder has become a reference value, as a learning result operation pressure. The controller calculates a differential pressure across the flow control valve and computes a target opening area of the flow control valve on the basis of the differential pressure across the flow control valve and a target flow rate of the hydraulic operating fluid that passes through the flow control valve. The controller computes a target value of the operation pressure generated by the solenoid valve, on the basis of an opening characteristic table, the target opening area, and the learning result operation pressure, and controls the solenoid valve on the basis of the target value of the operation pressure.

The invention relates to the technical field of loader control, in particular to an extended-range loader multi-power-source cooperative work and load balancing control method which comprises the following steps: S1, collecting working parameters of each power source in the operation process of a loader; s2, calculating a current total load demand based on the working parameters collected in the S1; s3, analyzing and outputting the output capacity of each power source, including the maximum power output of the internal combustion engine, the power range of the motor and the working pressure range of the hydraulic system; s4, calculating the optimal output power of each power source according to the total load demand in S2 and the output capacity of each power source; and S5, dynamically adjusting the output power of each power source according to the optimal output power determined in the step S4. According to the invention, by dynamically optimizing the power distribution and the load balance of each power source, the energy efficiency and the working efficiency of the extended-range loader are improved, the energy waste is reduced, and meanwhile, the stability and the reliability of the system are ensured.

The invention relates to a vacuum diffusion bonding method for nickel-based superalloy and niobium alloy, and aims to solve the problems that the existing nickel-based superalloy and niobium alloy are difficult to bond and a brittle phase is easy to generate. The vacuum diffusion method comprises the steps that firstly, the surfaces of the nickel-based high-temperature alloy and the niobium alloy to be welded are polished and ultrasonically cleaned; preparing a Ti-Mo-Cr intermediate layer or a V-Cr intermediate layer, and placing the intermediate layer between the cleaned surfaces to be subjected to diffusion bonding of the nickel-based superalloy and the niobium alloy to obtain an accessory to be welded; thirdly, the to-be-welded part is placed in a high-temperature vacuum diffusion furnace to be vacuumized; and 4, applying working pressure, and controlling the bonding temperature to be 900-1300 DEG C for diffusion bonding. According to the present invention, the compound components of the joint can be changed through the intermediate layer, the generation of the brittle phase is limited, the bonding between atoms can be achieved, the reliable connection is formed, and the relatively high joint strength can be obtained.

The invention discloses a hydraulic braking system of an electric control vehicle in the technical field of hydraulic braking, and aims to solve the problems of small braking flow and slow response of a braking system in the prior art. The method includes the steps that a traditional brake system directly utilizing a pump body to charge energy for a brake is abandoned, a brake energy accumulator is arranged to charge oil for the brake, and the brake energy accumulator is large in instantaneous flow and high in pressure, can drive the brake to conduct effective braking in a short time and further has the advantage of being high in response speed; an energy storage control valve set is further arranged for the brake energy accumulator and used for supplementing hydraulic oil for the brake energy accumulator in time, and it is guaranteed that the brake energy accumulator is repeatedly used. Through introduction of the energy storage control valve group, the brake energy accumulator has an automatic liquid filling function and automatically keeps working pressure, the failure rate of the brake is reduced, the automatic liquid filling function is achieved through the energy storage control valve group, and the energy storage control valve group achieving the function based on the hydraulic control rule has higher reliability compared with a pure electric control component.

The invention relates to the technical field of energy storage and heat dissipation, and discloses a centralized energy storage power station heat dissipation system. A data acquisition module of the system obtains historical operation data at different altitudes and generates a historical cooling parameter set; a feature analysis module extracts features from the features to obtain a historical feature parameter set, and a trend change feature matrix is established according to the historical feature parameter set; the pressure adjusting module constructs a pressure control space based on the matrix, and determines a feature early warning index set by calculating the parameter aggregation degree of historical abnormal events; the heat dissipation execution module extracts real-time characteristic parameters to establish state vectors, and calculates the position deviation degree between the state vectors and the early warning index set to generate real-time pressure regulation factors. The pressure adjusting module generates a pressure control model in combination with real-time adjusting factors, historical characteristic parameters and a trend matrix and outputs cooperative control parameters of the variable-frequency screw pump and the gear pump, precise adjustment of the working pressure of the cooling liquid is achieved, and efficient and stable operation of the energy storage power station is guaranteed.

The invention provides a real-time monitoring method and system for abrasion of a hobbing cutter of a shield tunneling machine, and relates to the technical field of underground engineering construction equipment.The method comprises the steps that working pressure data, working temperature data and surface image data of a target hobbing cutter of the shield tunneling machine are collected based on a pressure sensor, a temperature sensor and a hobbing cutter camera; transmitting the data to a central processing system based on an advanced encryption standard algorithm and carrying out preprocessing operation; analyzing the data based on a long and short term memory network model, a support vector machine model and a convolutional neural network model, and generating a pressure data score, a temperature data score and an image data score; calculating a wear state score based on a fusion evaluation algorithm; the remaining service life of the hob is determined based on the Monte Carlo simulation prediction algorithm, and when the service life is lower than the preset service life lower limit, an abrasion early warning mechanism is triggered, so that the abrasion state of the hob can be accurately monitored, the maintenance cost is reduced, and the safety and economic benefits of shield construction are improved.

The invention relates to the field of GRP pipeline pressure testing, in particular to a large-diameter GRP pipeline pressure testing method, which comprises the following steps of S1, performing preparation work before pressure testing; s2, a pre-hydrostatic test: carrying out segmented pressurization on the pipeline to be subjected to pressure test; s2, checking whether the pipeline to be subjected to pressure test leaks or not, if leakage occurs, repeating S2 after overhauling, and if leakage does not occur, continuing pressurizing to test pressure; s3, main hydrostatic test: after reaching the test pressure, maintaining the pressure for 30-35 minutes, reducing the pressure to the working pressure if the pressure drop is less than or equal to 0.02 MPa during the pressure maintaining period, and maintaining the pressure for 30-35 minutes; checking whether the pipeline to be subjected to pressure test leaks or not, and if yes, repeating the steps S2-S3 after overhauling; if no leakage exists, the main hydrostatic test is ended; and S4, discharging water and releasing pressure, and dismounting the temporary pressure test system. According to the pressure testing method, the characteristics of the material of the GRP pipeline are comprehensively considered, and the problems that in a traditional pressure testing method, the GRP pipeline is prone to being damaged due to too fast pressure loading and the construction period is prone to being affected due to too slow pressure loading are effectively solved in a segmented pressurization and multi-stage pressure maintaining mode.

The invention discloses fine grinding equipment and a grinding method for porcelain insulators, and relates to the field of insulator production, the fine grinding equipment comprises a pug refining barrel and a grinding box, the bottom end of the grinding box communicates with the top end of the pug refining barrel, two grinding rollers are rotationally connected into the grinding box, the two grinding rollers are arranged in a mutually attached mode, and the two grinding rollers are arranged in a matched mode. A heating roller is rotatably connected to the interior of the pug refining barrel, a protruding end is fixed to the outer side of the heating roller, and the two grinding rollers rotate oppositely, so that falling pug is subjected to primary grinding, large particles in the pug are ground, bubbles in the pug are discharged through extrusion, extrusion and re-grinding are conducted in the pug refining barrel, and the pug refining efficiency is improved. During secondary grinding, the vacuum pump continuously extracts air, keeps a vacuum environment, absorbs bubbles and moisture in the pug and discharges the bubbles and moisture out of the pug cylinder, so that the fineness and the purity of the pug are improved, and meanwhile, through primary grinding, the working pressure of the pug cylinder can be reduced, and the service life of the pug cylinder can be prolonged.

The utility model discloses an air-blowing type precision seeder for an air-blowing type precision high-speed seeder, and belongs to the technical field of seeding machinery. Comprising a high-pressure side shell, a rotary seed disc, a low-pressure side shell, a high-pressure maintaining structure and a seed metering structure, the seed metering structure comprises a seed metering pipe and a seed suction hole blocking body; the rotary seed disc is rotationally connected with the high-pressure side shell, a seed inlet of the seed discharging pipe is formed below a seed releasing position, the low-pressure side shell is provided with a working pressure relief airflow discharging hole, and the high-pressure maintaining structure and the seed suction hole blocking body are connected with the low-pressure side shell; the high-pressure maintaining structure comprises a low-pressure side shell and a low-pressure side inner shell which are rotationally connected, a cavity formed between the low-pressure side inner shell and the low-pressure side shell is a leakage gap air pressure containing cavity, and the edge portion of the low-pressure side shell is connected with the edge portion of the high-pressure side shell in a sealed mode. And the edge part of the low-pressure side inner shell and the edge part of the rotary seed disc are pressed and attached together in a sealing manner. The device has the characteristics of high working reliability, long service life, low maintenance rate, energy conservation, consumption reduction and the like.

The invention provides polishing equipment, a polishing method and a polishing device, and belongs to the technical field of semiconductor manufacturing. The polishing equipment comprises a polishing table; the polishing pad is arranged on the upper surface of the polishing table; the driving shaft is used for driving the polishing table to rotate; the polishing head is arranged in a space above the polishing table and is used for pressing the silicon wafer on a polishing pad for polishing; the polishing head comprises a main body head, a pressurizing cavity and a rubber pad, the pressurizing cavity and the rubber pad are arranged on the side, facing the polishing pad, of the main body head, compressed air can be supplied into the pressurizing cavity through the first pipeline to form working pressure, and the working pressure acts on the rubber pad and can be transmitted to a silicon wafer to be polished through the rubber pad; the polishing head further comprises at least one air bag arranged in the pressurizing cavity and a second pipeline for supplying compressed air into the air bag. And the controller is used for adjusting the amount of air applied to each air bag so as to adjust the working pressure applied to the silicon wafer by each air bag. The flatness of the surface of the silicon wafer can be improved.

An embodiment uses a symmetrical elastomeric design with hydraulic pistons on either end (as opposed to a single piston on conventional BOPs) which allows for lower actuation forces, reduced friction, and reduced wear and tear. The lower actuation forces correspond to lower operating pressures which allows the body and housing to be smaller, leading to a smaller footprint.

A gearbox includes an inner-outer gear pair having a small tooth difference, the inner-outer gear pair including: an inner gear disposed about an inner gear axis and having a first number of inner gear teeth; and an external gear having an external gear axis, the external gear arranged for orbital motion about the internal gear axis and having a second external gear tooth number, the external gear arranged for engagement with the internal gear teeth; the small tooth difference between the tooth number of the first outer gear and the tooth number of the second inner gear is smaller than one fifth of the tooth number of the inner gear. And wherein the internal gear teeth and the external gear teeth have an involute shape with no profile displacement or with a profile displacement below a value at which a working pressure angle of the internal-external gear pair will exceed a nominal pressure angle of the internal-external gear pair without application of a profile displacement by more than 20%, and wherein the internal gear teeth and the external gear teeth have an involute shape with no profile displacement or with a profile displacement below a value at which a working pressure angle of the internal-external gear pair will exceed a nominal pressure angle of the internal-external gear pair without application of a profile displacement. And wherein at least one of the internal gear teeth and the external gear teeth has an addendum coefficient of less than 0.8. Such a gearbox may provide improved efficiency.

The invention relates to the technical field of ball valve manufacturing, in particular to a manufacturing method and system of a high-sealing-performance PVC integrated ball valve, which can improve the manufacturing efficiency and ensure the consistency and stability of ball valve production. The method comprises the steps that application scene information of the ball valve is collected; the application scene information comprises working pressure, a medium type, a temperature range and an installation condition; carrying out element extraction on the application scene information, and carrying out demand analysis to obtain a production element set; on the basis of the production element set, traversing a ball valve manufacturing scheme library to obtain a ball valve manufacturing scheme; inputting the ball valve manufacturing scheme into a pre-constructed ball valve performance analysis model to obtain an overall performance index of the ball valve; the overall performance index of the ball valve is compared with a preset performance index threshold value, if the overall performance index of the ball valve is larger than or equal to the preset performance index threshold value, it is indicated that the ball valve produced according to the ball valve manufacturing scheme is qualified, and the integrated ball valve is manufactured according to the ball valve manufacturing scheme.

The invention provides a multidisciplinary simulation analysis method and system for operation characteristics of a ship lubricating oil system, and belongs to the technical field of ship simulation, and the method comprises the steps: setting working parameters of the lubricating oil system, and setting interlocking control logic of the lubricating oil system; constructing an energy accumulator flow equation; the energy accumulator flow equation is constructed based on the relation between the instantaneous pressure and the instantaneous flow after the energy accumulator is started, and the relation is determined based on the fluid resistance characteristic of the lubricating oil system, the normal working pressure of the system and the normal working flow of the system; and the working parameters, the interlocking control logic and the energy accumulator flow equation are imported into simulation software, and a lubricating oil system simulation model is established. According to the method, the operating characteristics of the system are analyzed by setting the working parameters of the lubricating oil system, the interlocking control logic and the energy accumulator flow equation constructed based on the relationship between the instantaneous pressure and the flow and combining the simulation model, so that the accuracy of analyzing the influence of the pressure pulsation on the lubricating oil system is improved.

The invention relates to the technical field of compressor temperature control, and discloses a compressor temperature control system capable of preventing generation of condensate water, which comprises a sensing module, an execution module and a controller. The sensing module is used for collecting air temperature, relative humidity, system working pressure and circulating oil temperature parameters of the compressor in real time. The controller is configured to calculate the current pressure dew point of the system based on the air temperature, the relative humidity and the working pressure of the system; the pressure dew point serves as a floating lower limit, a preset system optimal working temperature upper limit serves as a fixed upper limit, and a dynamic safe working interval is determined; finally, a cooling unit and a heating unit in the execution module are cooperatively controlled to work according to the relation between the circulating oil temperature and the dynamic safety working interval. By establishing the dynamic safety lower limit changing along with the working condition, the problem that the compressor is prone to generating condensate water under the high-humidity or low-load working condition to cause oil emulsification is effectively solved, and accurate and energy-saving temperature control is achieved.

The invention discloses a supercritical hydrocarbon fuel flow heat exchange mechanism experiment system which comprises a vacuum heat insulation bin, a sample injection system, a condensation system, a power supply system and a back pressure valve. Wherein the fuel storage tank is used for introducing hydrocarbon fuel into an experiment piece; the power supply system is used for electrifying and heating the experiment piece through the two sliding rails; the two sliding rails are used for relatively sliding on the rotating bracket so as to fix experiment pieces with different lengths; the rotary bracket is used for rotating and fixing about the rotary supporting shaft so as to realize angle adjustability of the experiment piece; the plurality of exposed thermocouples are used for collecting the wall surface temperature of the experiment piece; and the back pressure valve is used for controlling the working pressure in the experimental system pipeline to be supercritical pressure. The system solves the problems that an existing experiment device cannot be suitable for experiment pieces of various sizes and specifications, the angle of the experiment piece cannot be deflected, data acquisition is difficult, and modal conversion cannot be achieved.

The invention relates to the technical field of hydraulic cylinders, and discloses a motor control type intelligent oil cylinder and a control method thereof.The motor control type intelligent oil cylinder comprises a cylinder barrel, a piston rod is arranged in the cylinder barrel, an integrated valve seat is fixedly connected to the outer surface of the cylinder barrel, and a low-pressure oil port and a high-pressure oil port are formed in the top of the integrated valve seat; a visual displacement detection sensor, a controller, a first temperature and pressure sensor and a second temperature and pressure sensor are arranged on the top of the integrated valve seat. The displacement of the piston rod is measured through the visual displacement detection sensor, and the real-time temperature of an emulsion medium and the working pressure of a rod cavity and a rodless cavity of the oil cylinder are detected through the first temperature and pressure sensor and the second temperature and pressure sensor. Meanwhile, the controller can collect the detected oil cylinder position and pressure temperature signals, and then control the two motor direct-drive type digital reversing valves through the collected data, so that the displacement of valve elements of the two control digital reversing valves is achieved, and accurate positioning and motion control of a piston rod are achieved.