458 results about "Pressure controller" patented technology

The invention discloses a vacuum adsorption device and an adsorption method, the device comprises a carrying table and a driving device, vacuum holes and sealing holes which are distributed in a staggered manner are formed in the surface of the carrying table, and a plurality of independently controlled vacuum areas are formed. Each area is provided with an independent vacuum pipeline, a pressure controller and a switch, and precise negative pressure regulation and control are achieved. The lifting sealing ring is arranged in the sealing hole, the height is adjusted through the driving device, and the position of the sealing ring and the warping state of the wafer are monitored in real time through the detection device. In the adsorption process, if warping exists, the height of the sealing ring is automatically adjusted, the wafer is flattened step by step in a subsection adsorption mode of subarea control, and global adsorption is started after the heights of all the sealing rings are consistent. According to the method, the problem that a traditional adsorption mode is poor in adaptability to large-warping wafers is effectively solved through the partition control and dynamic adjustment technology, the method has the advantages of being stable in adsorption, uniform in stress, low in breakage rate and the like, and the process compatibility and the production yield are remarkably improved.

The invention discloses a pressure controller for a water supply and drainage system and a regulation and control method, and relates to the technical field of emergency protection devices. The method comprises the following steps: acquiring monitoring data of each pressure controller; based on the monitoring data, the pressure value gradient amount of each pressure controller is obtained; obtaining an abnormal region position of the conveying pipeline based on each pressure value gradient amount; obtaining a first pressure controller based on the abnormal region position; and the first pressure controller is adjusted, so that the maximum pressure value of the abnormal area position is smaller than or equal to a standard pressure threshold value. Through the arrangement of the pressure controller capable of measuring the pressure and position of the conveying pipeline, the position where turbulent flow or vortex occurs in the conveying pipeline can be determined, then the pressure of the abnormal area of the conveying pipeline is adjusted based on the corresponding pressure controller, and the situation that the abnormal area of the conveying pipeline is damaged due to the too large pressure is avoided.

The invention relates to a hydraulic tunnel model test device, and belongs to the technical field of pressure test devices in hydroelectric and hydraulic engineering. Multi-directional ground stress is applied through external oil cylinders, wherein the external oil cylinder on the upper portion applies vertical stress to a rock mass similar material layer; horizontal stress is applied through external oil cylinders on the left side and the right side; a clay layer is laid at the bottom, plastic deformation is generated under the action of vertical stress to form bottom ground stress from bottom to top, and full stress field simulation is achieved. The loading process is divided into two stages: firstly, ground stress loading is carried out, vertical stress and horizontal stress are sequentially applied, and a clay layer deforms to ensure bottom stress; and then internal and external water pressure loading is carried out, the external pressure controller simulates surrounding rock water pressure through the external loading membrane bag, and the internal pressure controller simulates water pressure in the tunnel through the internal loading membrane bag. According to the device, the complex stress environment of the deep-buried tunnel is truly simulated by accurately controlling the multidirectional ground stress and the internal and external water pressure, and a reliable test platform is provided for studying the stability of a lining structure.

The present invention belongs to the technical field of seepage testing of coal and rock masses, and specifically discloses a coal and rock permeability measurement device and method capable of correcting the deviation of measurement values caused by adsorption. The device includes a constant temperature box, a triaxial gripper arranged in the constant temperature box, a power gas storage tank, an injection gas storage tank, a vacuum pump, a gas pressure controller, a first switch, a vacuum pump, a second switch, a third switch, a fourth switch, a downstream standard container, a fifth switch, an upstream pressure sensor, a downstream pressure sensor, a temperature sensor and a computer; based on Darcy's law and the principle of mass conservation, combined with the permeability measurement work in two stages of pressure increase and pressure decrease, the deviation of permeability measurement caused by the adsorption of injected gas in the coal and rock mass is corrected, and the problem that the traditional permeability measurement method cannot eliminate the large deviation of permeability measurement caused by gas adsorption is solved.

A two-phase liquid immersion cooling system is described in which a heat-generating computer component evaporates a dielectric fluid in its liquid phase. The dielectric vapor is then condensed back to the liquid phase for cooling computer components. Using a pressure controlled vessel and a pressure controller, the disclosed system can operate at sub-ambient pressure. By controlling the pressure at which the system is operated, a user may affect the temperature at which the dielectric fluid evaporates and thereby achieve improved performance of a given computer component. A self-healing computing system may be created using a robotic arm and a slot-based computing component. A two-phase liquid immersion cooling system is described in which a heat-generating computer component evaporates a dielectric fluid in its liquid phase. The dielectric vapor is then condensed back to the liquid phase for cooling computer components. Using a pressure controlled vessel and a pressure controller, the disclosed system can operate at sub-ambient pressure.

The utility model relates to the field of liquid drop microfluidics, in particular to a low-temperature sample injection liquid drop generating device. The utility model discloses a low-temperature sample injection liquid drop generation device which comprises a gas source, a pressure controller, a water-phase sample injection bottle, an oil-phase sample injection bottle, a water-phase sample injection pipe, an oil-phase sample injection pipe, a collecting bottle, a temperature control device and a liquid drop generation chip, and the liquid drop generation chip comprises at least one water-phase chamber, one oil-phase chamber and one sample discharge chamber. Temperature control devices are arranged at the sample introduction bottle and the collection bottle; the device is simple in structure, temperature adjustment can be carried out in the process from liquid drop generation to liquid drop collection completion, and the problem that reaction of liquid drops generated firstly and liquid drops generated later is not synchronous is solved, so that experimental errors are reduced, and experimental accuracy is improved.

The invention relates to the technical field of inspection and detection, and discloses a safety interlocking device of a quick-opening container and a detection method and device of a container control cabinet. A detection device composed of a power supply circuit, a main controller, a liquid crystal screen, a pressure main adjusting module, a pressure auxiliary adjusting module, a pressure transmitter signal simulation module, a zero-pressure controller signal simulation module, a storage module, a gas exhauster, a pressure sensor and the like is adopted, and a pressure container or / and a safety interlocking device can be detected. Therefore, when the quick-opening-door container is in a shutdown state, the quick-opening-door safety interlocking device can be subjected to safety and reliability verification, meanwhile, the control logic of the container control cabinet is verified, the blank of related detection is filled, and the safety and reliability of the quick-opening-door pressure container are improved.

The invention discloses a tritium feeding system of a fusion device and a control method of the tritium feeding system, and relates to the technical field of controlled nuclear fusion device feeding, and the tritium feeding system comprises a negative pressure containing operation space and a tritium gas transmission pipeline located in the negative pressure containing operation space; the tritium gas transmission pipeline is located in the negative pressure containing operation space, and a gas storage device, a first pressure controller and a first pipeline barometer are sequentially arranged on the tritium gas transmission pipeline in the gas transmission direction of the tritium gas transmission pipeline; the gas storage device is used for storing gas in the tritium gas transmission pipeline; the first pressure controller is used for controlling the internal air pressure of the tritium gas transmission pipeline; the first pipeline barometer is used for detecting the pipeline air pressure at the front end of the injection valve; and the air storage device is provided with a second pipeline barometer for detecting the air pressure in the air storage device. Under a low-pressure working mode and a conventional pressure intensity working mode, the tritium feeding efficiency can be guaranteed, and efficient injection is achieved.

The invention discloses an electric steering pump integrated with a high-low pressure controller for a new energy vehicle, a system and a redundancy control method. The electric steering pump comprises a double-winding motor, a hydraulic steering pump, the high-pressure controller, the low-pressure controller, a sensor and a power actuator. A high-voltage winding and a low-voltage winding are integrated in the double-winding motor; the double-winding motor is connected with the hydraulic steering pump, the high-voltage controller is connected with the high-voltage winding, the low-voltage controller is connected with the low-voltage winding, and compared with the prior art, triple criteria of voltage deviation, current change rate and temperature are fused, so that the fault false alarm rate is effectively reduced; and a torque smoothing algorithm based on an S-shaped transition curve is adopted, so that dual-mode seamless switching control is realized, and the response efficiency is improved.

A pressure regulating device includes an on-board storage tank, a mixing chamber, first and second lines, a recirculation line, a pressure sensor and a controller. The storage tank stores and supplies cryogenic fuel to a combustion chamber and includes a booster pump. The first line supplies cryogenic fuel in the liquid state and includes a pressurizing pump and a first regulation valve. The second line supplies cryogenic fuel in the gaseous state and includes a compressor and a first control valve. The recirculation line includes a second regulation valve and with a first heat exchanger. The pressure sensor detects the pressure inside the storage tank. The controller receives the pressure and controls the first and second regulation valves, the first control valve, the pressurizing pump, the booster pump and the compressor, as a function of a value of a setpoint pressure inside the storage tank.

To provide a pressure controller having a structure capable of reducing an intrusion risk of foreign matter to the inside, and a gas supply system using the same.SOLUTION: A pressure controller adjusts a pressure of gas, and has a gas inflow part and gas outflow part, a first gas flow path, a second gas flow path, a third gas flow path, and a pocket portion, where the second gas flow path and the third gas flow path are parallel to a vertical direction, and the first gas flow path intersects with the second gas flow path. Further, the second gas flow path has a pocket part on an extension line facing the third gas flow path. The third gas flow path is connected to either one, which is arranged vertically above, of the gas inflow part or gas outflow part, and one end of the second gas flow path is connected to the first gas flow path and the other end thereof is connected to the third gas flow path.SELECTED DRAWING: Figure 3

The present invention discloses a closed-loop EGR flow control system and control method for a natural gas engine. The control system includes: a controller for determining an EGR demand flow rate based on actual engine operating conditions; a controller for obtaining the pressure of an air and gas mixture detected by an intake pressure sensor; or, alternatively, for determining the pressure of an air and gas mixture based on the EGR demand flow rate, a threshold flow rate, the maximum opening of an EGR valve, the actual opening of the EGR valve, the gas flow rate, and the fresh air flow rate; a controller for determining an actual EGR flow rate based on the obtained pressure of the air and gas mixture, the partial pressure of gases in the cylinder, the pressure-to-flow conversion slope, the gas flow rate, and the fresh air flow rate; a controller for determining an EGR flow rate correction value based on the obtained actual EGR flow rate and the EGR demand flow rate; and a controller for adjusting the EGR valve opening based on the EGR flow rate correction value so that the actual EGR flow rate matches the EGR demand flow rate, thereby achieving closed-loop control of the EGR flow rate. The present invention can achieve precise control of the EGR flow rate in two ways.

In accordance with some embodiments, the present disclosure provides A brake system for braking a vehicle using one or both of a main braking system and a redundancy braking system, the brake system comprising: a brake demand detecting unit configured to detect a driver's brake demand; an electronic control unit comprising: a pressure controller configured to control a pressure inside a master cylinder in response to a value detected by the brake demand detecting unit, wherein the internal pressure of the master cylinder is controlled by generating an electrical signal for a first demand current; a motor position controller configured to control a position of a motor by generating an electrical signal for a second demand current; and a current controller configured to control the current of the motor in response to an electrical signal received from one of the motor position controller and the pressure controller; a position detecting unit configured to detect a position of a rotor of the motor; and a pressure detecting unit configured to sense the internal pressure of the master cylinder.

The invention discloses a modularized gas pressure controller with a replaceable measuring range and a gas pressure regulation and control method, and belongs to the technical field of mechanical measurement. The invention aims to solve the problems that the whole air pressure controller needs to be replaced in the air pressure regulation and control process, the operation is tedious and the replacement is inconvenient. The device comprises a box body and an air pressure measurement and control module detachably connected in the box body, a main control circuit board is fixedly connected in the box body, and the air pressure measurement and control module comprises a measurement and control circuit board, and a sensor and a reference sensor which are connected with the measurement and control circuit board; the main control circuit board is in communication connection with the measurement and control circuit board; the multiple air pressure measurement and control modules are identical in appearance specification, and each air pressure measurement and control module has a unique measuring range. According to the invention, the air pressure measurement and control module with the target air pressure range is selected according to needs and is installed in the box body, the operation is simple and rapid, meanwhile, 1ms process control is realized by using the rapid response of the reference sensor, and 0.01-level air pressure measurement high-precision output is realized by using the sensor.

The invention relates to the technical field of intelligent control, and provides an intelligent porcelain furnace control system based on Internet of Things, the intelligent porcelain furnace control system is provided with a cloud server used for storing porcelain furnace operation data and program control; the intelligent porcelain baking furnace control system is provided with a controller and a machine vision module. The controller is used for receiving the operation parameters, collected by the sensor system, of the porcelain baking furnace, processing and analyzing the operation parameters and generating a control instruction; the controller controls a movement mechanism of the porcelain baking furnace and the temperature and pressure in the furnace; the controller further comprises an intelligent algorithm module which can automatically adjust a control strategy according to real-time operation data and preset process parameters of the porcelain baking furnace so as to optimize the porcelain baking process. Besides, the controller also has a fault diagnosis function, can monitor the operation state of the porcelain furnace in real time, and immediately gives an alarm and takes corresponding protection measures once abnormity is detected so as to prevent equipment damage and production accidents.

The invention relates to the technical field of rehabilitation robot control, in particular to an active-disturbance-rejection backstepping control system of a wrist rehabilitation robot. The wrist rehabilitation robot adopts two pneumatic artificial muscle systems as driving elements, and the control system comprises a tracking differentiator used for tracking and differentiating an input target angle signal; the extended state observer is used for estimating the system state and the total disturbance of the system in real time; the nonlinear error feedback controller is used for forming an error feedback signal and generating a control torque; the backstepping method controller is used for calculating and distributing the output pressure of the pneumatic artificial muscle system; the PID controller is used for dynamically correcting the output pressure; and the self-adaptive combination valve is used for controlling the pressure in the pneumatic artificial muscle system. According to the method, the inherent problems of high nonlinearity, uncertainty and hysteresis effect of a pneumatic artificial muscle system are solved, and high-precision trajectory tracking control over wrist joint movement is achieved.

The utility model discloses an auxiliary device for mounting a pressure controller, which belongs to the field of auxiliary devices and comprises a pressure controller body, a mounting plate is fixedly mounted on one side of the pressure controller body, a mounting screw is fixedly connected to the lower portion of the mounting plate, and the pressure controller body is fixedly mounted on the mounting plate. A tool box is fixedly mounted on one side of the pressure controller body, an arc-shaped clamping plate is fixedly connected to a mounting plate, a limiting bolt is in threaded connection with one side of the arc-shaped clamping plate, a flip box is mounted on one side of the tool box, a handle is fixedly connected to one side of the flip box, and a hinge is arranged below the handle. A clamping seat is fixedly connected to the upper part of the flip box; the tool box is fixedly installed on one side of the pressure controller body, the flip box is connected with the tool box in a clamped mode, then the placing layer is used for placing parts for installing the pressure controller body, installation personnel do not need to frequently bend down to take the parts, and the parts do not fall off.

The embodiment of the present invention provides an extracorporeal counterpulsation pressurization system, comprising: a control panel, a computer control center, an air source pressure controller, an air source device, a counterpulsation sequential solenoid valve, an airbag device, and a sensor module. The control panel comprises a display module and a control module, the display module receives the airbag pressure information sent by the sensor module, and the control module sends the pressurization requirement set by the user to the computer control center. The computer control center is connected to the air source pressure controller and the counterpulsation sequential solenoid valve respectively, on the one hand, controls the gas delivered to the airbag by the air source device, and on the other hand, controls the inflation or exhaust state of the airbag through the counterpulsation sequential solenoid valve, so that the airbag pressure value is raised to the gradient pressure value at the highest; the gradient pressure value gradually increases according to the preset rules at every preset time, and stops increasing after reaching the preset terminal pressure value. During the remaining treatment time, the maximum pressure of the airbag in each counterpulsation cycle maintains the terminal pressure value. The sensor module collects the pressure value of the airbag device and transmits it to the control panel. The system can make the airbag pressure rise slowly and gradually to the set treatment pressure in a multi-step form according to the different physical conditions and tolerance differences of the patient, giving the patient a gradual adaptation process, and optimizing the patient's experience and treatment compliance.

The invention relates to the technical field of pressure controllers, in particular to an intelligent pressure controller which comprises a shell, a processing unit and a control unit. A threaded connector is arranged at the bottom of the shell and used for being connected to a pipeline. An elastic membrane, an ejector rod and a sensor are arranged in the shell; the elastic diaphragm ejects the ejector rod under the action of a pressure medium; a sectional cleaning mechanism is arranged in the shell; the sectional cleaning mechanism is used for cleaning dirt on the elastic membrane in a sectional manner; the first mounting ring, the first cleaning block, the second mounting ring and the second cleaning block are arranged on the two sides of the shell, dirt on the periphery of the elastic membrane is wiped by the first cleaning block, dirt in the middle of the elastic membrane is wiped by the second cleaning block, and therefore it is guaranteed that the pressure of a pressure medium in a pipeline transmitted by the elastic membrane is not affected by the dirt.

The invention provides a test device for simulating a pollutant migration process under a temperature-moisture coupling effect, and belongs to the field of soil environment scientific research. The test device comprises variable-pressure gas supply equipment, a soil column pipe, exhaust equipment, a rainfall simulation system, evaporation and illumination simulation equipment and a data acquisition and analysis system. The variable-pressure gas supply equipment comprises a pollution gas storage tank and a pressure controller; the soil column pipe comprises an air inlet cavity, a simulated soil column cavity and an exhaust cavity, and a sampling hole is reserved in the simulated soil column cavity; the data acquisition and analysis equipment comprises a distributed optical fiber, a data acquisition instrument, a computer and a gas chromatograph. The test device and the test method provided by the invention can accurately control temperature and humidity, simulate rainfall, evaporation and illumination, are suitable for various soil types, record data in real time through a high-precision monitoring system, and reveal diffusion, convection and adsorption rules of gas in the soil.

The invention discloses a powder gas leakage diffusion monitoring physical simulation system and method. According to the system, a plurality of gas energy control doors are sequentially installed in a simulation box body in the length direction; the dry powder aerosol generator, the smoke generator, the temperature generator, the humidity generator, the pressure controller and the toxic gas standard gas cylinder are connected with the head end of the simulation box body; the smoke exhaust fan is connected with the tail end of the simulation box body; the recycling and filtering device is connected with the smoke exhaust fan; the gas treatment tank is connected with the recycling and filtering device; the multi-parameter integrated detection unit is arranged in the cavity space of the simulation box body; the armored heating jacket is coated outside the simulation box body; the data processing platform is connected with the multi-parameter integrated detection unit; the method comprises the following steps: the system sets a simulation environment; simulating a leakage diffusion process; analyzing the spatial and temporal distribution condition of the multi-dimensional monitoring data to obtain a diffusion path and a concentration change trend of the leaked substance, and displaying a simulation result in real time. According to the system and the method, the powder gas leakage diffusion process under different environment parameter combination conditions can be simulated.

The present invention discloses an automatic calibration device for pressure gauges, comprising a pressure gauge silo, a gripping mechanism, a detection interface, a positioning and tightening mechanism, a visual inspection device, a pressure controller and a host computer; the pressure gauge silo is used to store pressure gauges to be calibrated, the gripping mechanism is used to identify and grip the pressure gauges to be calibrated from the pressure gauge silo and place them on the detection interface, the positioning and tightening mechanism is used to rotate the detection interface to tighten the pressure gauges to be calibrated, the pressure controller is used to apply a preset pressure to the pressure gauges to be detected, the visual inspection device is used to collect information about the pressure gauges to be calibrated and collect the readings of the pressure gauges to be detected during the process of applying the preset pressure and send them to the host computer, the host computer is used to receive the information about the pressure gauges to be calibrated and the reading information of the pressure gauges to be detected, and calculate the deviation of the pressure gauges to be calibrated according to the reading information; the device can reduce the calibration error of the pressure gauges.

The utility model relates to the technical field of air pressing equipment, in particular to air pressing equipment integrating an air dryer and an air compressor into a skid, which comprises a skid seat, an air compressor, a refrigeration type compressed air dryer, a compressed air filter, an air-water separator group and a double compressed air filter group. The utility model focuses on the innovation of the air pressing equipment, and provides the air pressing equipment which integrates the air dryer and the air compressor into the skid for solving the problems of dispersion, low efficiency, poor precision and the like of the traditional air dryer and the traditional pressing equipment. The air compressor supplies air, the refrigeration type compressed air dryer dehumidifies and then is precisely regulated and controlled through the PLC in combination with the high-precision pressure controller, and the device has the outstanding advantages of integration, high efficiency, precise pressure control, safety, reliability, wide application and the like, and can be widely applied to air pressure testing requirements of industries such as petrochemical engineering, natural gas, pressure pipelines and pressure containers.

The invention discloses a method for testing dynamic granularity of a valve, and belongs to the technical field of ultra-pure fluid systems. According to the method, through components such as an air inlet pressure regulating valve, a pressure gauge, a high-pressure controller, a particle counter, a main channel and a test channel, accurate monitoring of dynamic particle pollution of the valve under the actual working condition is achieved; the method comprises the following steps: 1, ensuring that a particle counter works under stable sampling flow through a flow regulation compensation mechanism, and improving the accuracy of measured data; 2, static purging is carried out, initial particle pollution is effectively removed, and a clean basic environment is provided for dynamic testing; step 3, dynamically purging the tested piece by detecting the switching frequency, simulating the actual opening and closing process of the valve, and dynamically evaluating the cleanliness of the tested piece; according to the invention, the limitation of the traditional static test is overcome, the dynamic particle release characteristics of the valve are truly reflected, and a comprehensive and accurate particle size test result is provided for an ultra-pure fluid system.

The invention discloses a transient wind tunnel total pressure control method based on a dynamic neural network and fuzzy control, and relates to the field of wind tunnel test, and the method comprises the steps: S1, constructing a preset opening table of a pressure regulating valve; s2, the fuzzy controller and the pressure controller are disconnected in the wind tunnel starting stage, and the pressure regulating valve opening PI controller is adopted to control the opening of the pressure regulating valve; s3, total pressure is collected in real time to determine whether the coarse adjustment stage of pressure regulating valve opening control is completed or not, if not, valve opening control continues to be conducted, and if not, the fine adjustment stage of S4 is executed; s4, the gas source pressure II collected in real time and the known target total pressure I and the target Mach number I are substituted into a neural network preset opening controller, and fine adjustment of the PI controller on the opening of the pressure regulating valve is completed; and S5, judging whether the fine adjustment stage is ended or not based on the total pressure difference. The invention provides a transient wind tunnel total pressure control method based on a dynamic neural network and fuzzy control, which can effectively save the total pressure adjustment time and reduce the test energy consumption.

According to the system for controlling expansion and contraction of the solid-state battery by utilizing nitrogen isostatic pressing disclosed by the invention, air of an air compressor is separated by a gas separation membrane, and high-pressure dry high-purity nitrogen is generated and passes through a nitrogen inlet proportional servo control valve; the opening degree of the control valve is controlled through the pressure controller, high-purity nitrogen is accurately controlled to enter the space around the soft package battery cell elastically fixed in the sealed shell of the solid-state battery module, isostatic pressure can be accurately and uniformly applied in all directions, close contact between an electrode and electrolyte is maintained, gaps and stress concentration caused by volume expansion or shrinkage are reduced, and the service life of the solid-state battery module is prolonged. The MEMS hardware collects data in a sealed shell of the solid-state battery module in real time and sends the data to the pressure controller, and the method for controlling expansion and contraction of the solid-state soft package battery through closed-loop nitrogen gas isostatic pressing is formed by combining original characterization charging and discharging repeated expansion and contraction data of a battery cell of the solid-state battery. And expansion and contraction of the solid-state soft package battery in the charging and discharging process are controlled.

The invention belongs to the field of electro-hydrostatic actuators, and particularly relates to an electro-hydrostatic actuator structure with a high servo characteristic and a control method. Comprising a servo motor, a hydraulic pump, a hydraulic control one-way valve, a shuttle valve, an electromagnetic valve, a pressure sensor, an actuator cylinder and a controller. The servo motor is mechanically connected with the hydraulic pump, hydraulic control one-way valves are connected between the actuating cylinder and an oil inlet and outlet path of the hydraulic pump, and the pressure of remote control ports of the two hydraulic control one-way valves is switched through the two electromagnetic valves. The pressure sensors measure the pressure of the two cavities of the actuator cylinder and transmit the pressure to the controller. The two inlets of the shuttle valve are respectively communicated with the two cavities of the actuating cylinder to select the high-pressure side pressure in the oil cavity of the actuating cylinder; and the controller controls the rotating speed and the torque of the servo motor after receiving the position instruction, the motor state parameters and the data of the pressure sensor. According to the electro-hydrostatic actuator, the rotating speed overshoot of the hydraulic pump in the starting process can be reduced, and the servo characteristic of the electro-hydrostatic actuator is improved.

The utility model relates to the technical field of silane gas analysis, and provides a sample introduction and tail gas treatment system for silane gas analysis, which is used for sample introduction of silane gas and is beneficial to improvement of detection repeatability and accuracy. The system comprises a six-way valve and a purge gas input pipe, and further comprises a sample gas inlet pipe, a carrier gas inlet pipe, a quantitative ring and a tail gas output pipe which are respectively connected with the six-way valve, the system further comprises a tail gas absorption tank; the tail gas output pipe comprises an upstream pipe section and a downstream pipe section, and the purge gas input pipe is communicated with the tail gas absorption tank through the downstream pipe section of the tail gas output pipe; the sample gas inlet pipe is provided with a pressure regulating valve and a pressure sensor, and the pressure regulating valve and the pressure sensor are respectively in communication connection with the pressure controller; a carrier gas pressure reducing valve and a flow controller for adjusting the carrier gas flow in the carrier gas inlet pipe are arranged on the carrier gas inlet pipe; and the upstream pipe section of the tail gas output pipe is provided with a flow meter and a one-way valve.

The utility model belongs to the technical field of head-up display instruments, and particularly relates to an automobile head-up display instrument pressure maintaining clamp which comprises a first clamping block symmetrically arranged at one end of an automobile head-up display instrument and a second clamping block arranged at the other end of the automobile head-up display instrument, and two pressure sensors are arranged on the two end faces of the automobile head-up display instrument. The first pressure sensor and the second pressure sensor are connected with a pressure controller; first and second angle adjusting assemblies are respectively arranged at two opposite ends of the first and second clamping blocks; first and second force application cylinders are respectively arranged at two ends; the first clamping block and the second clamping block form an angle alpha with the horizontal plane. The pressure is measured through the force application cylinder and the pressure sensor, and the force application cylinder and the pressure sensor are matched with the pressure controller to test the pressure of the head-up display instrument, so that certain pressure is kept in the pressing process to ensure that a screen or other components are tightly combined with a shell or other parts of the head-up display instrument; the angle adjusting assemblies on the two sides can adjust the two clamping blocks to adapt to curved screens of different sizes and different angles.

The utility model discloses an oil gas recovery on-line detection device which comprises an explosion-proof cabinet body, and two thermostats, a reversing valve, two EPC pressure controllers, a gas circuit box, two FID combustion chambers, two FID detectors, a PLC control system, a junction box, a transformer, an explosion-proof switch, two explosion-proof electric appliance cabinets and a hydrogen generator are arranged in the explosion-proof cabinet body. The accessories are electrically connected in series or in parallel; a pressure regulating filter valve and an audible and visual alarm are respectively arranged on the outer side surface of the explosion-proof cabinet body; a first air inlet and a second air inlet are formed in the side face of the anti-explosion cabinet body. According to the utility model, a double-range detection mode is adopted, and the inlet end and the outlet end of the oil gas recovery device are detected independently and do not interfere with each other, so that the detection precision is improved; nitrogen is introduced into the switch cabinet, so that positive pressure of the cabinet body can be kept, and external flammability is prevented from entering internal electrical equipment; meanwhile, moisture in sample gas can be taken away, and drying and cooling are achieved.