2327 results about "Exhaust valve" patented technology

A valve timing control device includes: a unit for calculating a target valve timing for one of an intake valve and an exhaust valve in accordance with an operational state; a unit for detecting an actual valve timing of one of the intake valve and the exhaust valve; an actual valve timing control unit for generating a controlled variable for the VVT based on a difference between the target valve timing and the actual valve timing; a unit for learning a learning value of the controlled variable required for maintenance of the actual valve timing based on an integral correction value; and a unit for detecting a malfunction in a VVT from an amount of a shift in the actual valve timing when learning is not completed yet, and for detecting a malfunction in the VVT from the difference when learning is already completed.

The invention relates to a micro-pressure oxygen cabin self-adaptive pressure control method and system based on iterative optimization, belongs to the technical field of pressure control, and aims at solving the problems that existing micro-pressure oxygen cabin pressure control depends on manual repeated debugging, the efficiency is low, and self-adaptive optimization cannot be achieved. The method comprises the steps that in the pressure stabilizing stage of the micro-pressure oxygen cabin, the pressure in the cabin is monitored in real time, and when the pressure exceeds the upper limit or the lower limit of a preset pressure interval, a pressure stabilizing wave crest section or wave trough section opening degree adjusting algorithm is executed so as to adjust the opening degree of an electric exhaust valve. And after the single oxygen therapy process is finished, executing an iterative optimization step: automatically analyzing the pressure data of the current pressure stabilization stage by the system, and iteratively updating the control parameters for the next oxygen therapy process according to the pressure data. According to the method, self-learning and evolution of control parameters are realized through a closed-loop mechanism of real-time adjustment and redisk optimization, the parameters can be quickly converged to the optimal state within multiple times of operation, the debugging period is shortened, and the stability of pressure control is improved.

The invention provides a liquid cooling CDU system with an intelligent pressure balance tank, and relates to the technical field of electronic equipment heat dissipation, and the system comprises a main circulation loop, the intelligent pressure balance tank, a liquid supplementing loop, a control system and a monitoring module. The intelligent pressure balance tank is provided with a liquid level sensor set, an exhaust valve installed on the non-top portion and a mechanical pressure release valve. The installation height of the exhaust valve is preset so that a buffer air layer can be reserved. The control system responds to signals of the liquid level sensor and controls opening and closing of the liquid supplementing loop and the exhaust valve. Through the design of a buffer air layer and a non-top valve group of the intelligent pressure balance tank, automatic liquid supplementing and graded pressure protection logic are combined, the problems of manual liquid supplementing lag, large pressure fluctuation, high safety risk and the like of a traditional liquid cooling CDU system are solved, and the liquid cooling CDU system is suitable for efficient heat dissipation of a data center and high-power electronic equipment.

The invention discloses laser cladding repairing equipment for an exhaust valve rod of a marine main engine. The laser cladding repairing equipment comprises a rotating mechanism, a cleaning mechanism and a repairing mechanism. The rotating mechanism adopts a plurality of stepping motors to drive friction wheels, self-centering clamping and intermittent rotation of the exhaust valve rod are achieved through a hydraulic cylinder and a plane connecting rod mechanism, it is ensured that positioning is accurate, and the rotating mechanism adapts to workpieces with different diameters. The cleaning mechanism is arranged below the rotating mechanism, a centrifugal fan is used for simultaneously driving a grinding disc to rotate at a high speed to conduct surface grinding, scrap iron is discharged in time through the negative pressure suction function of the centrifugal fan, and cleaning and dust removal are integrated. And the anti-diffusion cover and the anti-diffusion plate are matched to form a local closed area, so that dust dissipation is effectively inhibited. The repairing mechanism adopts a mechanical arm to carry a laser cladding head, the curved surface of the valve rod can be tracked with high precision, and automatic cladding is completed. The equipment integrates automatic clamping, efficient cleaning, synchronous dust removal and intelligent repairing, and the automation level, the surface treatment quality and the operation safety of repairing of the exhaust valve rod are remarkably improved.

The invention discloses a dual-fuel engine combustion control method based on hydrogen-ammonia energy ratio and gas distribution overlap angle regulation and control, which comprises the following steps: 1) fuel ratio control: acquiring current operation state parameters of an engine, determining a target AER according to preset mapping, regulating ammonia gas supply quantity and hydrogen supply quantity to enable the actual AER to reach the target AER, and controlling the fuel ratio; the AER is adaptively set according to engine load and combustion stability conditions; 2) valve timing control: adjusting the opening time of an intake valve or the closing time of an exhaust valve through a variable valve timing mechanism so as to change a valve timing overlap angle VOA, wherein the VOA is set to be a negative value, a small overlap angle or a positive overlap angle according to the working condition of an engine; (3) injection time sequence optimization is conducted, specifically, the injection time of ammonia gas and the in-cylinder direct injection time of hydrogen are controlled respectively, and coordinated optimization of a fuel injection strategy and valve timing is achieved; and 4) closed-loop steady-state control: monitoring a combustion state and an emission index in real time, comparing the combustion state and the emission index with a threshold value to serve as a feedback signal, and correcting the target AER and VOA settings in time. According to the dual-fuel engine combustion control method based on regulation and control of the hydrogen-ammonia energy ratio and the gas distribution overlapping angle, the energy ratio of hydrogen fuel and ammonia fuel and the overlapping opening angle of an intake valve and an exhaust valve are dynamically adjusted under different working conditions, so that the combustion reaction rate and temperature are coordinated, and the stable and efficient combustion process is achieved; and harmful emissions of NOx, unburned ammonia and the like are obviously reduced.

The invention belongs to the technical field of exhaust valves, and particularly relates to a composite exhaust valve with an integrated buffering and filtering assembly, which comprises a shell, a supporting block is fixedly arranged at one end of the shell, an air inlet head is fixedly arranged on the supporting block, a cavity is formed in the supporting block, a concave groove is formed in the cavity, and a sealing strip is arranged at the top of the concave groove. Cylinders are connected to the bottom of the concave groove in an array mode, a connecting rod is fixedly arranged at the bottom of the concave groove, a bottom plate is fixedly connected to the bottom end of the connecting rod, and a buffering mechanism is arranged in the cavity. According to the composite exhaust valve with the integrated buffering and filtering assembly, by arranging the filter cylinder and the baffle, efficient buffering and filtering treatment can be conducted on conveyed air pressure, stable operation of pneumatic equipment is guaranteed, the conveyed air pressure enters the cavity after being filtered through the filter cylinder, impurities such as particles in an air source can be effectively intercepted, and the effective circulation section of compressed air can be changed by adjusting the angle of the baffle; the narrower the circulation space is, the slower the airflow speed is, throttling buffering is achieved, and the working stability of the exhaust valve is guaranteed.

The utility model discloses a battery box body, a battery pack and a new energy automobile. Belongs to the technical field of vehicles and comprises a beam body, the beam body defines an exhaust channel, a first exhaust hole and a second exhaust hole are formed in the two sides of the beam body in the width direction of the beam body respectively, and the first exhaust hole and the second exhaust hole are staggered in the height direction of the beam body. The exhaust valve of the battery cell on one side of the beam body is communicated with the exhaust channel through the first exhaust hole, the exhaust valve of the battery cell on the other side of the beam body is communicated with the exhaust channel through the second exhaust hole, and when thermal runaway happens to the battery cell on one side of the beam body, high-temperature and high-pressure gas generated by the battery cell can be exhausted into the exhaust channel. The staggered first exhaust holes and the second exhaust holes can prevent gas exhausted into the exhaust channels from being directly exhausted to the battery cells on the other side of the beam body, the risk that the battery cells on the other side of the beam body are heated can be reduced, and therefore the safety risk can be reduced.

The utility model discloses an exhaust valve and a battery cover plate assembly, the exhaust valve comprises an inner valve body, an outer valve body and a sealing piece, the two ends of the inner valve body along the axial direction are respectively provided with a first exhaust port and a second exhaust port, and the first exhaust port is used for being communicated with an exhaust hole of gas production equipment; the outer valve body is detachably connected with the inner valve body, a third exhaust port communicated with the second exhaust port is formed in the outer valve body, and the first exhaust port, the second exhaust port and the third exhaust port form an exhaust channel; the sealing piece is arranged between the inner valve body and the outer valve body, the exhaust valve has a first sealing state and a second exhaust state, and in the first state, one end of the sealing piece is matched with the outer valve body in an abutting mode, and the other end of the sealing piece is compressed, deformed and matched with the inner valve body in a sealing mode; in the second state, one end of the sealing piece is in abutting fit with the outer valve body, and the other end of the sealing piece is in clearance fit with the inner valve body. The exhaust valve can realize automatic exhaust of gas, and ensures that liquid is not discharged during exhaust.

The invention discloses a double-machine regenerative steam-electricity double-drive small turbine thermodynamic system and a control method, belongs to the technical field of power generation, and aims to solve the problem that steam extraction parameter reduction and system power balance maintenance cannot be both considered in the prior art. According to the system, the MCT is adopted to extract exhaust steam of the ultrahigh-pressure cylinder to drive the water feeding pump and the variable-frequency generator, and meanwhile, a low-superheat-degree steam source is provided for the multi-stage heater. When P is greater than Pmax, executing at least one of the following control strategies: (a) adjusting the opening degree of a steam inlet valve of the MCT; (b) the opening degree of an MCT steam exhaust valve is adjusted; (c) adjusting the opening degree of a heater bypass valve; the steam exhaust pressure of the MCT is kept stable through three-way closed-loop control, and safe and efficient operation is achieved by combining power compensation of the variable-frequency generator.

The invention discloses a fuel cell water and gas discharge control method, device and equipment and a readable storage medium, and the method comprises the steps: presetting a first calibration quantity and a second calibration quantity of periods and opening durations of a water discharge valve and a gas discharge valve, and enabling the second calibration quantity to have a shorter period and a longer water and gas discharge duration; when it is monitored that the idle running time of the fuel cell system exceeds the first threshold value, the control parameters of the drain valve and the exhaust valve are switched from the first calibration quantity to the second calibration quantity, and the control parameters are switched back to the first calibration quantity after the set time is continued, so that the working condition that the circulating gas flow is reduced under long-time idle running is adapted; liquid water and accumulated gas in the galvanic pile are effectively discharged by adjusting the period and duration of drainage and exhaust; the problems of liquid water gathering, circulating flow attenuation, local water logging of the electric pile, local film drying, unbalanced gas concentration and the like caused by traditional fixed parameter control during long-time idling operation can be avoided, the voltage consistency of the electric pile is guaranteed, and the fault that the voltage of a single piece is too low is reduced.

The invention discloses a steam sterilizer based on deep reinforcement learning and an intelligent control system, and belongs to the technical field of automatic control. In the intelligent control system, a first subtracter generates a sequence first error signal according to an actually measured temperature provided by a temperature sensor and a set temperature; the second subtracter generates a sequence second error signal according to the actually measured air pressure provided by the pressure sensor and the saturated air pressure of the water vapor determined by the set temperature; the deep reinforcement learning module generates a first state according to the sequence first error signal, generates a second state according to the sequence second error signal, and generates control strategies of the first PID controller and the second PID controller according to the first state and the second state; generating a control strategy of the electronic change-over switch according to the second error signal; the first PID controller controls the working state of the steam generator; and the second PID controller selects the electric control air inlet valve or the first electric control exhaust valve through the electronic change-over switch. Saturated steam can be ensured to participate in sterilization, and the sterilization effect is good.

The invention relates to the field of fire extinguishing equipment, in particular to a fire extinguishing device for electrical equipment. The fire extinguishing device for the electrical equipment comprises a box body, a box door is rotatably connected to the box body, a gas storage box is fixedly connected to the top of the box body, a gas inlet valve and a gas outlet valve which are symmetrically distributed are installed on the side wall of the gas storage box, and gas outlet pipes which are symmetrically distributed are arranged between the bottom wall of the gas storage box and the top wall of the box body; a protective shell is fixedly connected to the top of the air storage box, a space cavity used for installing equipment is formed between the protective shell and the air storage box, and an exhaust valve is arranged at the position, close to the bottom, of the box body. Fire extinguishing is carried out through fire monitoring and inert gas cooperation, and response is rapid; the pulling assembly is matched with the balancing weight to improve the fire extinguishing efficiency; a heat dissipation hole and air outlet pipe sealing assembly guarantees the fire extinguishing effect; the uniform gas outlet assembly realizes full-space fire extinguishing; the gravel box and the pull curtain assembly protect the box body and provide a flat platform, the service life of equipment is prolonged, and safety and applicability are improved.

A kind of reciprocating compressor full-range control type rotary cup exhaust valve, including valve seat, valve core, valve rod and the like components, valve core and valve seat all adopt V cup type structure, valve core and valve rod adopt integrated structure, are controlled by rotary motion driving device full range, set the motion law of valve core, valve rod, execute acceleration, deceleration, waiting and brake and the like motion instruction, realize rotary valve opening and closing, rotary friction is small, sealing performance is good, long-term use wear can be automatically compensated, flow coefficient is big, resistance coefficient is small, the effective flow area of valve core and valve seat is more than 2 times of conventional plane-shaped meshed intake valve;The present application also has the characteristics of no impact, long stay time when fully open, overcome the essential defects of the prior art meshed exhaust valve, such as large resistance loss, valve piece impact is serious;The present application can be used for the modification of existing meshed exhaust valve, and can also be used as a complete set of exhaust valve for new reciprocating compressor.

The invention relates to the technical field of fabric testing, in particular to a testing device for fabric. According to the technical scheme, the ventilation detection device comprises a compressed air tank, a control valve and a mounting table, a plurality of telescopic air guide cylinders communicated with the compressed air tank are mounted on the mounting table, electric ventilation butterfly valves are arranged in the moving ends of the telescopic air guide cylinders, and a plurality of bearing cylinders corresponding to the telescopic air guide cylinders in position are mounted on a ventilation bearing table; the bearing cylinder is provided with an exhaust valve and a detection piece. Fabric is fixed to the two fixing rollers, the lifting table moves to push the two fixing rollers to be away from each other, a stretching test can be conducted on the face, meanwhile, the breathability detection device is made to be close to the breathability bearing table, and a stretchable gas guide cylinder and a bearing cylinder are in butt joint so that a breathability test can be conducted.

The invention relates to the technical field of performance detection of foam cement slurry for well cementation of oil and gas wells, in particular to a device and method for evaluating the compression performance of foam cement slurry. The former comprises a pressure tank, a test tank and a gas adding tank, the upper end of the pressure tank is provided with a gas inlet communicated with the inside and the outside, and the lower end of the pressure tank is provided with a liquid outlet communicated with the inside and the outside; a pressure transmission piston is vertically and slidably installed in the pressure tank in a sealed mode, and an identification layer is arranged on the outer side of the pressure tank. The device is reasonable and compact in structure, the gas adding tank can inject gas with different pressure values into the pressure tank, the control valve facilitates pressure control between the pressure tank and the testing tank, scale marks are marked on the measurable cup body so that the volume change of water for testing can be observed conveniently, and therefore the volume change of foam mud to be tested is reflected; the pressure measuring piston can transmit pressure to the foam cement slurry in the testing tank, air between the pressure measuring piston and the inner side of the upper portion of the testing tank can be emptied during operation by arranging the exhaust hole and the exhaust valve, and the measured volume error is reduced.

The invention discloses a compressed air energy storage multi-stage expansion machine quick starting system and method. The compressed air energy storage multi-stage expansion machine quick starting system comprises multi-stage expansion machines which are sequentially connected in series and a main air inlet pipeline connected to the first-stage expansion machine. The main air inlet module is used for supplying and adjusting air flow to the multi-stage expansion machine in a normal operation mode; the last-stage priority starting module is used for converting a high-pressure gas source into low-pressure large-flow mixed gas flow suitable for being driven by the expansion machine in the initial starting stage, and the converted mixed gas flow bypasses the previous expansion machine and directly drives the last-stage expansion machine to rotate and accelerate; the multi-stage preheating module is used for guiding part of gas to carry out reverse-sequence preheating on the previous-stage expansion machines, reverse airflow serves as starting damping and is further used for assisting in stabilizing the rotating speed, the gas completing the preheating task is exhausted through an exhaust valve, speed increasing and reverse-sequence preheating are carried out in parallel, the starting time is greatly shortened, and the starting efficiency is improved. And the starting time of the unit from the cold state to the grid-connected condition is reduced to the minute level.

This invention provides a fuel cell system that can estimate the nitrogen concentration of gases emitted from the fuel cell at low cost. [Solution] The fuel cell system 1 comprises a fuel cell 2 that generates electricity through an electrochemical reaction between hydrogen gas and oxygen gas and discharges hydrogen off gas containing unreacted hydrogen gas together with nitrogen gas and moisture; a hydrogen supply channel 40 that supplies hydrogen gas from a hydrogen tank 41 to the fuel cell 2; a recirculation channel 50 that recirculates the hydrogen off gas back into the hydrogen supply channel 40; a gas-liquid separator 51 that separates moisture from the hydrogen off gas to obtain dehumidified hydrogen gas and stores the separated moisture; an exhaust valve 54 that exhausts the dehumidified hydrogen gas from the recirculation channel 50; a pressure sensor 52 that detects the pressure in the recirculation channel 50; and a control device 6 that controls the exhaust valve 54. The control device 6 estimates the concentration of nitrogen gas contained in the dehumidified hydrogen gas based on the value detected by the pressure sensor 52, and controls the exhaust valve 54 to an open state when the concentration of nitrogen gas exceeds a predetermined value.

The utility model relates to the technical field of wood-working mechanical edge sealing equipment industry, and particularly discloses an edge sealing band floating type cutting mechanism which comprises an air cylinder bottom plate, an air cylinder is fixedly connected to the outer side of the air cylinder bottom plate, a cutter clamping sleeve is fixedly connected to the output end of the air cylinder, and a blade fixing plate is fixedly connected to the interior of the cutter clamping sleeve. The top of the air cylinder bottom plate is fixedly connected with an upper cutter guide groove, the bottom of the air cylinder bottom plate is fixedly connected with a lower cutter guide groove, the top of the air cylinder is fixedly connected with an exhaust valve, one end of the top of the exhaust valve is fixedly connected with a silencer, and the other end of the exhaust valve is in threaded connection with an L-shaped block insertion type threaded connector. The end, away from the cutter clamping sleeve, of the air cylinder is fixedly connected with a proximity sensor, the outer side of a bottom plate of the air cylinder is fixedly connected with a cutter groove, the swing assembly and the rotating shaft are arranged to control the whole cutting mechanism to swing, and meanwhile, the adjustable spring is reset through pressure, so that the cutter track material and the machining technology are optimized, and the cutting effect of a cutter edge is optimized.

The invention provides a method for determining a crankshaft reference phase of a reciprocating machine and a diagnosis method, device and system, and the method comprises the steps: collecting vibration signals of a plurality of measurement points of the reciprocating machine, and the measurement points at least comprise an air inlet valve and an exhaust valve of the reciprocating machine; taking the offset of the current period as a starting point, and intercepting an air inlet valve waveform and an exhaust valve waveform corresponding to a complete crankshaft rotation period from the vibration signal; respectively determining an air inlet valve actual measurement phase and an exhaust valve actual measurement phase according to the air inlet valve waveform and the exhaust valve waveform; calculating an air inlet deviation between the actually measured phase of the air inlet valve and a preset phase of the air inlet valve, calculating an exhaust deviation between the actually measured phase of the exhaust valve and the preset phase of the exhaust valve, calculating a phase deviation according to the air inlet deviation and the exhaust deviation, and updating an offset according to the phase deviation; and taking the updated offset as a starting point to repeat the process until the phase deviation is smaller than a preset threshold value, and taking the offset when the phase deviation is smaller than the preset threshold value as the crankshaft reference phase. According to the invention, the crankshaft reference phase can be obtained.

The invention relates to the technical field of abrasive material supply, and discloses a remote abrasive material continuous supply quantitative sand feeding system which comprises a remote abrasive material supply module and a continuous quantitative sand supply module, the remote abrasive material supply module comprises a sand storage box, a connecting hose and a sand supply tank, the connecting hose is provided with a non-return assembly, the sand supply tank is provided with an air blowing valve, and the sand supply tank is provided with a sand outlet; the continuous quantitative sand supply module comprises a sand blasting assembly and a sand supply hopper, the sand supply hopper is provided with a sand inlet, a sand outlet is communicated with the sand inlet through a sand supply pipe, the sand supply tank is provided with a first exhaust valve, the sand supply hopper is provided with a second exhaust valve, the sand blasting assembly comprises a sand supply roller and a driving part, and the sand supply roller is provided with a tooth groove; the non-return assembly is arranged to separate the sand storage box from the sand supply tank, so that the sand storage box is in a normal-pressure state, materials can be fed into the sand storage box at any time, and abrasive fine sand can be continuously conveyed for a long distance under the action of dual driving of gravity and air pressure difference by combining with mutual matching of the non-return assembly and the blowing valve.

Disclosed is an anti-siphonage and anti-overflow fuel pump structure. The anti-siphonage and anti-overflow fuel pump structure includes a fuel pump, a fuel inlet hose, a main flow channel assembly, a control box, an exhaust and backflow channel assembly, and a fuel outlet hose, where the control box includes a housing, a battery assembly, and a control board; the main flow channel assembly includes an input channel, an output channel, an exhaust port, and a seal port; and the exhaust and backflow channel assembly includes an exhaust valve, a pipeline joint, an exhaust pipe, and an exhaust and backflow channel, the exhaust valve is arranged inside the exhaust port, the pipeline joint is arranged above the exhaust valve, one end of the exhaust pipe is connected to the pipeline joint, and the other end of the exhaust pipe is connected to the exhaust and backflow channel.

The invention relates to the field of valve sealing tests, in particular to a valve sealing test device which comprises a test board, a moving frame is arranged on the upper portion of the test board, a placing plate is arranged on the moving frame, a fixing mechanism used for fixing a plurality of exhaust valves is arranged on the placing plate, and a water tank is arranged on the upper portion of the test board. When the exhaust valve is subjected to a sealing test, the test environment conforms to the working conditions of pressure, temperature, vibration, mounting angle and the like during actual use of the exhaust valve by utilizing the cooperation of the variable frequency water pump, the heating pipe and the rotating cylinder, the problem that a traditional static test result deviates from real performance is solved, and the accuracy of the test result is greatly improved; meanwhile, the exhaust valve is inverted to measure the liquid leakage amount, the blank of quantitative detection of the liquid leakage amount in a special scene is filled up, the potential safety hazard that the liquid leakage amount exceeds the standard in practical application when the test is qualified is avoided, and the device can meet the high-precision test requirement.

The utility model discloses post-treatment equipment for 2, 2-dimethylpiperidine-4-ketone production, which belongs to the technical field of waste gas treatment and comprises a pretreatment unit, a microwave catalytic oxidation unit, an adsorption unit, a condensation unit and a discharge system. The pretreatment unit comprises multiple layers of filter screens; the microwave catalytic oxidation unit comprises a catalysis box, and a microwave generator is arranged in the catalysis box; the adsorption unit comprises an adsorption cavity, an air uniformizing plate is arranged above the adsorption cavity, and a plurality of layers of activated carbon adsorption beds are arranged below the air uniformizing plate; the condensing unit comprises a condenser and a heat removal fan; the exhaust system comprises an exhaust funnel, and the exhaust funnel is provided with a gas monitor and an exhaust valve. Particulate matters in waste gas are removed through the pretreatment unit, catalytic oxidation is performed through the microwave catalytic oxidation unit, harmful components are further removed through an activated carbon adsorption bed of the adsorption unit, the condensation unit is used for cooling the waste gas and promoting VOCs to be condensed into liquid, and finally the treated waste gas is discharged through the discharge system.

The utility model discloses a horizontal roadway filling roof contact device, belongs to the technical field of mine filling, and solves the problems that the existing device is poor in filling effect, and filling slurry cannot be in 100% roof contact with a roadway roof. The device comprises a non-elastic air bag and a pressure pipeline, the non-elastic air bag is installed in a horizontal roadway, one end of the non-elastic air bag is connected with a first connecting pipe and a second connecting pipe, the second connecting pipe is connected with a discharging branch pipe through a filling discharging pipe, the discharging branch pipe is provided with a discharging valve, and the pressure pipeline is connected with the first connecting pipe. And an air inlet valve and an exhaust valve are arranged on the pressure pipeline. The utility model has the advantages of simple structure, convenient construction process and obvious filling effect, realizes 100% roof contact between the filling slurry and the roadway roof, and has strong practicability and wide application prospect.

The automatic exhaust valve comprises a valve body, a valve deck, an automatic exhaust assembly and a suspension part, one end of the valve body is connected with a water pipe through a drainage hole, the other end of the valve body is connected with the valve deck in a sealed mode, the periphery of the valve body is connected with the automatic exhaust assembly through a ventilation pipeline, and the suspension part is located in a cavity of the valve body and connected with the automatic exhaust assembly. The automatic exhaust assembly comprises an exhaust plug, an elastic piece and an exhaust pipe which are sequentially connected in the axial direction of the automatic exhaust assembly, the exhaust plug and the exhaust pipe are sleeved with the elastic piece, and the exhaust plug is located at the end, stretching into the ventilation pipeline, of the automatic exhaust assembly. A sealing groove is formed in the end, facing the elastic piece, of any one of the venting plug and the exhaust pipe, a sealing piece is embedded in the sealing groove, and the two ends, in the axis direction of the automatic venting assembly, of the sealing piece abut against the venting plug and the exhaust pipe in an interference fit mode respectively. The end, facing the elastic piece, of the exhaust plug is provided with a sealing protrusion, and the end, facing the exhaust pipe, of the sealing protrusion is embedded into the exhaust through hole of the exhaust pipe.

The utility model discloses an online verification and measurement device for a double-flange liquid level transmitter. The online verification and measurement device comprises a pressure-stabilizing measurement cylinder and the double-flange liquid level transmitter, the double-flange liquid level transmitter comprises a first flange, a second flange and a transmitter. The top of the pressure stabilizing measuring cylinder is communicated with the transmitter through the first flange; and the bottom of the pressure-stabilizing measuring cylinder is communicated with the transmitter through the second flange. And the top and the bottom of the pressure-stabilizing measuring cylinder are respectively communicated with the top and the bottom of a chemical container to be measured. And a drain valve is arranged at the bottom of the pressure-stabilizing measuring cylinder. And an exhaust valve is arranged at the top of the pressure-stabilizing measuring cylinder. According to the utility model, on-line verification and measurement of the double-flange liquid level transmitter are realized; the top and the bottom of the pressure stabilizing measuring cylinder are connected with the chemical container through the gas phase valve and the liquid phase valve respectively, liquid level fluctuation of the chemical container can be slowed down, an anti-interference effect is achieved, and the measuring result of the double-flange liquid level transmitter is more accurate and reliable.

A hydraulic retarder pneumatic control system based on an electromagnetic valve comprises an air source and an oil pool shell, the air source is sequentially connected with a pilot valve and a first inlet of a pneumatic valve in series, and the air source is further communicated with a second inlet of the pneumatic valve; an outlet of the pneumatic valve is connected in series with at least two parallel solenoid valves, outlets of the solenoid valves are connected in series with a quick discharge valve, and a first outlet of the quick discharge valve is communicated with the oil pool shell. Through reasonable arrangement of component structures and design of a pilot valve, no back pressure resistance exists during starting, the reversing resistance is small, and the system response time is greatly prolonged; and meanwhile, the electromagnetic valve is located behind the pneumatic valve, so that the starting backpressure is small, the starting power is small, quick response of work of the retarder is integrally achieved, the work response time is shortened, the cost is reduced, the overall stability of the system is improved, and the service life is prolonged.

The invention discloses a control method, a control system and related equipment for constant temperature, constant oxygen and constant pressure. The control method comprises the following steps: acquiring temperature data, oxygen concentration data and pressure data in a cabin body in which an oxygen cabin mainboard is positioned; determining a current working stage according to the pressure data and a preset target pressure value; in the boosting stage, the opening degree of an air inlet valve of a control cabin, the rotating speed of an air compressor and the oxygen production amount of an oxygen generator are synchronously increased; in the pressure stabilizing stage, at least two of the opening degree of an exhaust valve, the opening degree of an air inlet valve, the rotating speed of an air compressor, the oxygen production amount of an oxygen generator and the temperature adjusting capacity of an air conditioner of the cabin are adjusted at the same time according to the temperature data, the oxygen concentration data and the pressure data; if so, controlling the oxygen generator to be closed, and controlling the opening degree of the exhaust valve and the rotating speed of the air compressor to synchronously change. According to the invention, higher-precision pressure control, oxygen concentration control and temperature control can be realized, and the stability of pressure, oxygen concentration and temperature is ensured.

The invention discloses a high-pressure self-balancing type seabed sediment sampling bottle nitrogen charging anti-oxidation method, and belongs to the technical field of chemical analysis and material testing, and the method comprises the following steps: obtaining physical characteristic parameters of sediment in a sampling bottle; performing analysis and calculation according to the physical characteristic parameters, and determining initial nitrogen charging control parameters; filling nitrogen into the sampling bottle based on the initial nitrogen filling control parameter, and synchronously monitoring the pressure in the bottle and the pressure of the external environment to form a driving pressure difference; and a preset self-balancing exhaust valve is driven through the driving pressure difference, and residual gas is exhausted. According to the method, the initial nitrogen charging parameter is determined by firstly obtaining the physical characteristic parameters of the sediment, and then the driving pressure difference formed by nitrogen charging is used for driving the self-balancing exhaust valve to exhaust the residual gas, so that personalized, high-efficiency and high-reliability nitrogen charging anti-oxidation treatment can be carried out on different sediment samples.

The exhaust valve comprises a valve body, a first sealing piece and a valve bonnet, the valve body is detachably assembled at an exhaust port of gas production equipment, the valve body comprises a first hollow cavity, a first opening and a second opening which are communicated with the first hollow cavity are formed in the two ends of the valve body in the axial direction, and the first opening and the second opening are communicated with the first hollow cavity. The first opening penetrates through the gas release opening and is communicated with the interior of the gas production equipment; the first sealing piece is arranged outside the valve body at the second opening; the valve bonnet covers the first sealing piece, is in abutting fit with the valve body and is in clamping fit with the valve body, an exhaust port is formed in the valve bonnet in a penetrating mode, and the exhaust port, the second opening and the first opening are communicated to form an exhaust channel; the exhaust valve has a first sealing state and a second exhaust state, and in the first state, the first sealing piece is in sealing fit with the valve body; and in the second state, the first sealing piece is in clearance fit with the valve body. The exhaust valve can realize automatic exhaust of gas, and ensures that liquid is not discharged during exhaust.