5767 results about "Gas pressure" patented technology

The invention relates to the technical field of gas pipeline safety assessment, in particular to a gas pipeline safety assessment early warning system and method based on data analysis. The method comprises the following steps: collecting gas pressure data of a gas pipeline at multiple points at the same time, carrying out time-space synchronization processing to obtain aligned gas pressure data so as to construct a continuous gas pressure field of the pipeline, based on the gas pressure field, identifying the pressure distribution difference of the pipeline, estimating the transient flow velocity of the gas, continuously recording the transient flow velocity of the gas, and deducing the change of the flow velocity. Judging the deformation condition of the inner wall of the pipeline in combination with air pressure field data, positioning a deformation area, reconstructing a pipeline frame, analyzing deformation response, identifying a deformation type, identifying a corrosion evolution trend, performing safety evaluation, judging the gas circulation degree and performing physical safety evaluation. According to the invention, dynamic monitoring of the gas pipeline is realized, a data-driven safety management mode is promoted, the early warning capability of potential risks is improved, and a more intelligent safety assessment and early warning mechanism is formed.

The invention relates to the technical field of sewage treatment, in particular to a liftable aeration device and a sewage treatment system.The system comprises a data acquisition module for acquiring dissolved oxygen concentration, gas flow and air pressure at multiple moments before each moment in the sewage treatment process and recording the dissolved oxygen concentration, the gas flow and the air pressure as historical data sets of each moment; the feature analysis module is used for determining the gas supply stability at each moment; determining a first trend degree, a second trend degree, a first collaborative factor and a second collaborative factor of each fluctuation moment in the historical data set of each moment; determining a relative collaboration degree and a forward feedback index at each moment; the aeration control module is used for determining a proportionality coefficient and an integral parameter of a PID controller at each moment; and in combination with a PID (Proportion Integration Differentiation) controller, obtaining a gas flow control value at each moment, and controlling the concentration of the dissolved oxygen in the sewage. The gas flow can be more accurately adjusted, the control accuracy of the concentration of dissolved oxygen in sewage is improved, and the sewage treatment efficiency is improved.

The invention belongs to the technical field of intelligent control, and particularly relates to an intelligent regulation and control method for an operating environment in an SF6 ring main unit. The method comprises the following steps: firstly, acquiring temperature, gas pressure and humidity data of a plurality of sampling points in the ring main unit, and constructing a time sequence environment data set through time synchronization and missing interpolation processing; analyzing the temperature data, extracting fluctuation characteristics, determining an environment disturbance factor in combination with an electric arc trigger intensity index, and obtaining a cabinet body temperature control safety factor in combination with a dynamically adjusted temperature rise threshold and a gas insulation state; then constructing an environment equivalent thermal inertia model and a hot-pressure covariant model based on historical data, and calculating a thermal stability index of the cabinet body; and finally, whether adjustment is triggered or not is judged according to the thermal stability index and the temperature control safety factor, if yes, a temperature abnormal area is positioned through a convolutional neural network and a clustering method, the temperature control response level is calculated, a temperature control strategy library is called to be matched with adjustment parameters, and accurate control is achieved.

The invention relates to the technical field of insulated metal-enclosed switchgear, and discloses an environment-friendly gas-insulated ring main unit, which comprises a cabinet body, the cabinet body comprises a pressure relief chamber and a primary loop insulation chamber, a heat dissipation cylinder is fixedly arranged at the bottom in the pressure relief chamber, the top of the heat dissipation cylinder is fixedly connected with a pressure relief pipe, and the pressure relief pipe is fixedly connected with the primary loop insulation chamber. A first electromagnetic valve is fixedly arranged on a pipe body of the pressure relief pipe, and an air storage mechanism is arranged in the heat dissipation cylinder. A plurality of cabinet bodies are combined to form a ring main unit group, when the temperature of one ring main unit is abnormally increased, a corresponding first electromagnetic valve is opened, a sliding plate moves under the action of air pressure in a corresponding primary loop insulation chamber to form a gas storage cavity, insulation gas loss is avoided while pressure relief is performed, and cooling is performed; and the plurality of heat dissipation cylinders can be communicated in sequence, so that the air pressure in the primary circuit insulation chamber can be further improved to achieve a closed pressure relief effect in a cabinet deformation pressure and bursting pressure interval.

The invention provides a verification method of a mass flow controller and a chemical vapor deposition machine. The method comprises the following steps: in a gap between two adjacent process treatments, setting a first mass flow controller to be a preset flow, introducing first gas into a vacuum reaction chamber through a first gas pipeline, and measuring the gas pressure change of the reaction chamber to obtain a first pressure change rate; setting a second mass flow controller as a preset flow, introducing a second gas into the vacuum reaction chamber through a second gas pipeline, and measuring the gas pressure change of the reaction chamber to obtain a second pressure change rate; obtaining a detection relation coefficient based on the first pressure change rate and the second pressure change rate; and when the deviation ratio between the detection relation coefficient and a pre-obtained reference relation coefficient is greater than a preset threshold value, determining that the at least one mass flow controller has abnormal deviation. Through the method, the gas flow deviation of the machine can be detected, and the flow control condition of the mass flow controller is fed back, so that the use efficiency of the machine is improved, and the detection cost is reduced.

High pressure compressed gas pressure vessels and devices utilizing such vessels are disclosed herein. More particularly, aspects of the present invention are directed to high pressure (i.e., nitrogen or N2 based) pressurized gas cylinders with pierceable membranes recessed from the opening of the pressure vessel such that prior art piercing mechanisms cannot pierce the membrane for safety purposes. Additionally, aspects of the present invention are directed to pressurized gas operated devices with elongated pins for piercing pressure vessels with recessed pierceable membranes.

The invention provides an intelligent gas supply system of SF6 gas insulation equipment and an intelligent gas supply control method. The system comprises SF6 gas source equipment, the SF6 gas insulation equipment, a gas pressure sensor, a gas temperature sensor and a gas supply control module, the air supply control module comprises a control unit and an electromagnetic valve; the gas inlet end of the electromagnetic valve is connected with the gas outlet end of the SF6 gas source equipment through a pipeline, and the gas outlet end of the electromagnetic valve is connected with the gas inlet end of the SF6 gas insulation equipment through a pipeline; the control module is used for receiving a gas pressure value collected by the gas pressure sensor and a gas temperature value collected by the gas temperature sensor; dynamically calculating a gas pressure dynamic threshold value for judging SF6 gas leakage; the gas pressure value measured in real time is compared with the current corresponding gas pressure dynamic threshold value, and if the gas pressure value measured in real time is smaller than or equal to the current corresponding gas pressure dynamic threshold value, the electromagnetic valve is controlled to be opened, so that the SF6 gas source equipment supplements gas to the SF6 gas insulation equipment.

The invention relates to the technical field of engine accessory machining, and discloses an injection molding demolding mechanism for automobile engine accessory machining, which comprises an air pressure tank, a limiting bracket is fixedly connected to the side wall of the air pressure tank, and a fixed mold is fixedly connected to one end, far away from the air pressure tank, of the limiting bracket. The electric telescopic rod extends to force the movable mold and the sealing ring to slide outwards along the inner wall of the air pressure box, the movable mold drives the fixed ring to make contact with the fixed mold, the fixed mold discharges raw materials into a gap between the fixed mold and the fixed ring, and after cooling is completed, the electric telescopic rod generates contraction force; the square exhaust port and the sealing ring are forced to slide along the inner wall of the air pressure box, the square exhaust port compresses air in the air pressure box, the air in the air pressure box is converted from normal pressure to high pressure, high-pressure air acts on the side wall of a finished product through a first air outlet and a second outlet, the demolding procedure of the finished product is completed, and rigid contact of assemblies is avoided; and the parts are damaged.

The invention discloses a compressed air energy storage indoor simulation test device and method, and relates to the technical field of compressed air energy storage. The device comprises a triaxial pressure servo control system, a temperature control system, an air pressure control system and a multi-parameter measurement system, and can cooperatively simulate the real working environment of the underground gas storage. The triaxial system comprises a high-pressure tank body and a loading device and is used for applying triaxial stress to the rock sample; the temperature control system adjusts the temperature of the rock sample; the air pressure system comprises a high-pressure destructive experiment mode and a low-pressure precise simulation mode, the high-pressure destructive experiment mode is used for carrying out a high-pressure test and verifying the critical burial depth under different geological conditions, and the low-pressure precise simulation mode is used for researching the mechanical behavior, the damage mechanism and the leakage mechanism of the gas storage by regulating and controlling the air pressure and the flow and simulating the inflation and deflation process; the multi-parameter measurement system collects rock sample physical response data in real time. Through cooperative work of multiple systems, response characteristics of multiple support sealing systems under different conditions can be accurately reflected, and the system has remarkable simulation precision, experiment efficiency and cost advantages.

The invention relates to the field of compressed air energy storage and underground space structures, in particular to a high-pressure air storage underground cavern plugging structure and an arrangement structure.The outer side of the middle of a plugging body is connected with an anti-sliding protruding part, and the anti-sliding protruding part can reduce the possibility of sliding between the plugging structure and surrounding rock; the anti-sliding plugging capacity of the plugging structure is improved, the length of the plugging structure can be effectively reduced, the construction cost is reduced, and the construction period is shortened; moreover, a controller, a first pressure detection sensor and an electromagnetic air pressure valve are further arranged, during maintenance, a maintainer controls the electromagnetic air pressure valve and the inner side sealing door to be opened and closed through the controller, and pressure reduction and exhaust are conducted through a pressure reduction section till the gas pressure in the high-pressure gas storage chamber and the gas pressure in the maintenance channel are balanced; the pressure difference between the maintenance channel and the high-pressure gas storage cavern is effectively controlled, the possibility of damage to maintenance personnel and equipment is reduced, and the maintenance safety is remarkably improved.

The invention relates to the technical field of earthquake detection, and discloses a constant-pressure online detection device and method for the concentration and flow of gas escaped from a hot spring, and the device comprises a gas collecting hood, a buffer bottle, a gas flow detector, a constant-volume gas storage chamber, a constant-pressure detection valve, an online gas detector and a central controller; the gas collecting hood is arranged in a corresponding area of hot spring escape gas and collects the hot spring escape gas; the gas inlet end of the surge flask is communicated with the gas collecting hood through a pipeline, and the gas outlet end is communicated with the gas inlet end of the constant-volume gas storage chamber through a gas flow detector; the constant-volume gas storage chamber is communicated with an on-line gas detector pipeline through a constant-pressure detection valve, and when the air pressure value of hot spring escape gas stored in the constant-volume gas storage chamber is larger than a preset air pressure threshold value, the hot spring escape gas enters the on-line gas detector through the constant-pressure detection valve; the on-line gas detector is used for detecting gas components and concentration of gas escaped from the hot spring and sending detection data to the central controller.

According to the soft low-permeability coal seam hole protecting and permeability increasing integrated pipeline and the using method, a plurality of drill hole protecting and permeability increasing structures are all located in the deep position of a drill hole, hole sealing treatment is conducted on an extraction pipeline, the passive hole protecting, collapse preventing and supporting effects can be achieved on a gas extraction drill hole, and at the moment, gas extraction work is directly conducted; after the flow of the extracted gas is continuously reduced, the drilling hole is sealed firstly, the interior of the drilling hole is pressurized through free desorption of the gas, then gas is injected into all the annular gas bags through the gas injection pipe, all the annular gas bags are expanded in sequence to extrude the positions with collapsed holes so that the positions can be pressed and expanded, and active hole protection work is achieved; and meanwhile, the annular air bag expands to compress the space in the drill hole, so that the air pressure in the drill hole is increased, then the annular air bag retracts when gas is exhausted, and the cycle is repeated, so that variable-frequency pneumatic shock waves can be formed in the gas extraction drill hole to crack a coal body, and the coal seam gas is displaced to be quickly desorbed into the drill hole after fracturing, so that efficient gas extraction is realized.

The invention relates to the technical field of chemical reaction kettles, and relates to a chemical reaction kettle for preventing material adhesion, the chemical reaction kettle comprises a reaction kettle body, a power assembly, an adjusting assembly and a matching assembly, in the power assembly, a motor drives an outer cylinder to rotate and stir and drives an inflation assembly at the same time, so that a one-way nozzle sprays air into the reaction kettle; the adjusting assembly can automatically adjust the angle of the stirring blade according to the air pressure, adapt to the viscosity change of the solution in the stirring process and improve the stirring effect, and the matching assembly can introduce the high-pressure gas in the reaction kettle into the material box when the air pressure is increased; the high-pressure gas quickly disperses and sprays out the powder, so that the mixing time is shortened, the agglomeration probability is reduced, and the material mixing uniformity and the reaction efficiency are remarkably improved.

The invention discloses a multi-head gas analysis device, and relates to the technical field of infrared gas analyzers, the multi-head gas analysis device comprises a sampling joint body, and the sampling joint body comprises a sampling tube, a threaded port, a double-head connecting tube, an upper steel ball and an upper spring. In the using process, through the structural arrangement that the multiple sets of sampling connector bodies are arranged on the side end edge of the infrared gas analyzer side by side, the sampling requirements of the multiple sets of sampling tank bodies can be met, and the number of to-be-detected samples and the detection efficiency are effectively improved; the establishment of a gas passage from the sampling tank body to the sampling pipe is controlled through gas pressure, so that the to-be-detected gas samples in the sampling tank body at multiple positions can be sequentially detected, and the gas samples in the sampling cavity can be uniformly and thoroughly discharged into the infrared gas analyzer to be detected; and the to-be-detected gas sample in the sampling cavity is isolated from the introduced high-pressure gas by the piston plate, so that the detection precision of the to-be-detected gas sample can be guaranteed.

The invention discloses horizontal rotary fermentation equipment for food processing and a fermentation method, and relates to the technical field of food processing ferment.The horizontal rotary fermentation equipment comprises a tank body, a feeding hopper, a discharging pipe, a barometer, an exhaust pipe and a pressure relief valve, the circumferential outer wall of the tank body is fixedly connected with a fixing frame, and a supporting frame is arranged below the tank body; the fixing frame is fixedly connected with the supporting frame, and a first stirring assembly and a second stirring assembly which are used for fully fermenting materials are arranged in the tank body. According to the invention, through the arrangement of the first stirring assembly and the second stirring assembly, under the synergistic effect of the driving force provided by the power assembly and the stirring direction changed by the reversing assembly, efficient stirring of materials is realized, and good conditions are created for fermentation; the defoaming assembly is arranged, so that the problem that the fermentation quality is influenced by excessive bubbles during stirring of traditional horizontal fermentation equipment is effectively solved, and the stability and high efficiency of the food processing and fermentation process are guaranteed on the whole.

High pressure compressed gas pressure vessels and devices utilizing such vessels are disclosed herein. More particularly, aspects of the present invention are directed to high pressure (i.e., nitrogen or N2 based) pressurized gas cylinders with pierceable membranes recessed from the opening of the pressure vessel such that prior art piercing mechanisms cannot pierce the membrane for safety purposes. Additionally, aspects of the present invention are directed to pressurized gas operated devices with elongated pins for piercing pressure vessels with recessed pierceable membranes.

The invention relates to the technical field of energy storage, in particular to a constant-pressure compressed gas energy storage system and a using method. A constant-pressure compressed gas energy storage system comprises a constant-pressure gas storage tank suitable for constant-pressure storage of compressed gas; the expansion exhaust assembly comprises an air outlet pipeline and a first expansion machine, the air outlet pipeline communicates with the constant-pressure air storage tank, the first expansion machine is arranged on the air outlet pipeline, and the first expansion machine is suitable for being connected with a generator set; the heat storage assembly comprises a circulating heat storage pipeline and a heat storage device, the circulating heat storage pipeline is provided with a liquid outlet branch, the liquid outlet pipeline is communicated with the constant-pressure gas storage tank, heat storage fluid flows in the circulating heat storage pipeline, and the heat storage fluid is contained in the constant-pressure gas storage tank. The problems that in the energy releasing process of a constant-volume compressed gas energy storage system, compressed gas continuously flows out of a gas storage device, the pressure in the gas storage device can be gradually reduced, after the pressure of the compressed gas is reduced, the compressed gas reaches the interior of an expansion machine, then full-power power generation cannot be achieved, and then the output total work of the power generation system is limited are solved.

The invention relates to the technical field of cable bridges, and discloses a cable bridge with expansion joints, which comprises two cable bridge main bodies, expansion joint main bodies are slidably connected to the outer walls of the two cable bridge main bodies, and three air pressure sleeves are fixedly connected to the tops of the expansion joint main bodies. First air pressure cavities are formed in the inner walls of the three air pressure sleeves correspondingly, air in the first air pressure cavities and the second air pressure cavities is extruded by the extrusion assembly under the influence of the weight of the cable, so that air at the top and the bottom of a piston rod is in a high-pressure state, and when the cable at the main body part of the expansion joint vibrates, generated vibration is transmitted to a supporting plate; by means of compressibility of high-pressure gas on the two sides of the piston rod, vibration generated by the cable is absorbed, the vibration amplitude of the cable is reduced, and the situation that flexible connection between the expansion joint body and the cable bridge body easily causes increase of the vibration amplitude of the cable at the position, large pulling force is applied to the cable at the position, and the cable is easily damaged is effectively prevented.

In order to mechanically monitor a gas density of a greenhouse gas in a more climate-friendly and cost-effective manner, the invention provides a density monitoring method for monitoring the gas density of a noxious gas (10), comprising: a) providing a closed reference volume (26) with a partition wall (28) movably disposed between the reference volume (26) and the noxious gas (10) to be monitored, b) providing a reference gas (56) which has a lower global warming potential relative to the noxious gas (10) by at least a factor of two in the reference volume (26) at a reference gas pressure which is higher than the filling pressure of the noxious gas (10), c) compensating, by means of a spring device (32), for a force acting on the separation wall (28) due to the increased reference gas pressure in the reference volume (26), and d) detecting a deflection of the partition wall (28) for monitoring the gas density. A gas density monitor (14), its use in such a method and an electrical system provided therewith are also proposed.

The invention relates to the technical field of bag-type dust removers, and particularly discloses a high-efficiency low-heat-loss bag-type dust remover which comprises a dust remover body and further comprises a detection assembly arranged on one side of the dust remover body and used for detecting the gas pressure difference of the two sides of a bag according to the deflection angle. Through the detection assembly, the gas pressure difference on the two sides of the cloth bag can be converted into the deflection angle of the pressing rod for detection, and according to the deflection angle, detected by the detection assembly, of the pressing rod, when the deflection angle of the pressing rod reaches a limit value, the triggering assembly can automatically control the dust removing assembly to remove dust on the surface of the cloth bag; the trigger assembly can also automatically adjust the trigger limit value of the detection assembly according to the humidity condition of the dust-containing gas, the cleaning strength of the dust removal assembly can be adjusted according to the humidity of the dust-containing gas through the regulation and control assembly, the dust stripping effect is improved, the cleaning effect on the cloth bag can be improved, and the subsequent filtering efficiency of the cloth bag can be improved.

The invention provides a powder oxygen-free inert gas environment filling line and a filling method.The filling line comprises a conveying chain, a transfer bin, a working bin, a buffering bin, a filling device, a vacuumizing device, an inert gas inflation device and a cap screwing device, and the conveying chain sequentially penetrates through the transfer bin, the working bin and the buffering bin; a filling opening of the filling device and the cap screwing end of the cap screwing device are both located in the working bin, sealing doors are arranged at the end, away from the working bin, of the transfer bin, the position between the transfer bin and the working bin, the position between the working bin and the buffering bin and the end, away from the working bin, of the buffering bin correspondingly, and the vacuumizing device communicates with the transfer bin, the working bin and the buffering bin in sequence through a first pipeline. The inert gas charging device is sequentially communicated with the transfer bin, the working bin and the surge bin through a second pipeline, oxygen detection sensors and gas pressure sensors are arranged in the transfer bin, the working bin and the surge bin, and the filling line can ensure that the filling process is in an oxygen-free environment, so that the quality of powder products is ensured.

The utility model discloses a combined lining structure of an underground gas storage. The combined lining structure comprises a plurality of linings and a plurality of buffer devices, wherein the number of the buffer devices is the same as that of the linings; the multiple linings are sequentially arranged on the inner wall of the underground gas storage cavern in the circumferential direction of the underground gas storage cavern, and buffering seams are reserved between the adjacent linings. Each buffering device is arranged at one buffering seam and comprises a bent buffering piece and two fixing pieces; the two ends of the buffering piece are connected with the two adjacent linings in a sealed mode through fixing pieces respectively. The buffering seams are arranged between the adjacent linings, and the buffering devices are used in a combined mode, so that during gas storage, gas pressure borne by the fragmented linings is transmitted to external surrounding rock, tension fracture damage of the linings is avoided, and the compression performance of the linings is remarkably improved; when the gas is released, the adjacent linings are mutually squeezed to form a stressed whole, instability damage is avoided, the service life of the underground gas storage can be remarkably prolonged, and the safety of the underground gas storage can be remarkably improved.

The invention discloses spraying equipment for automobile production, and relates to the field of spraying equipment.The spraying equipment comprises a sliding base and an air delivery pipe, a spraying mechanical arm is installed on the sliding base, a movable head is movably installed on the spraying mechanical arm, two spraying heads are arranged on the movable head, and the air delivery pipe is connected with the sliding base. The two spraying heads are both connected with the gas conveying pipe; and a switching box is mounted on the movable head. It needs to be explained that in the embodiment of the invention, when one spraying head is blocked, the gas pressure in the switching box is increased, the switching plate is made to move, the switching through hole in the switching plate corresponds to the other output hole, at the moment, high-pressure gas is input into the other spraying head through the auxiliary output pipe, and switching of gas conveying pipelines is achieved; and meanwhile, the L-shaped frame drives the two spraying heads to be switched, then the switching plate and the two spraying heads are switched synchronously, and therefore when the spraying heads are blocked, the purpose of automatic switching is achieved, and continuous spraying work is guaranteed.

The utility model provides a fuel gas pressure reducing valve with a pilot-operated type fuel gas cut-off valve, which comprises a valve seat, a valve cover and a piston assembly, a gas inlet and a gas outlet are arranged on the valve seat, and the cut-off valve assembly is arranged on a gas inlet channel communicated between the gas inlet and the piston assembly and used for controlling on-off of gas flow in the pressure reducing valve. A three-way electromagnetic valve assembly is arranged in the valve seat on one side of the stop valve assembly, the three-way electromagnetic valve assembly is provided with an air inlet hole, a second air outlet hole and a third air outlet hole, and high-pressure air entering from the air inlet connector is communicated to the air inlet hole of the three-way electromagnetic valve assembly through a first process hole formed in the valve seat; the third air outlet hole is communicated with the back face of the stop valve assembly through a second process hole formed in the valve seat, and the second air outlet hole is communicated with the air outlet through a third process hole formed in the valve seat. Through the design of the independent three-way electromagnetic valve, a valve element switch is controlled by adopting very small electromagnetic force, so that the airflow direction is controlled, and switch control over the high-pressure main loop stop valve assembly is achieved.

The invention belongs to the technical field of gas production wellhead devices, and particularly relates to a sulfur-resistant and carbon dioxide-resistant gas injection and production wellhead device which comprises an injection and production four-way assembly, a crossover flange assembly and a desanding assembly. The desanding assembly comprises a first pipe body, a second pipe body, a treatment box, a desanding barrel, one end of the desanding barrel, an inner spiral piece, a spiral groove, an air cylinder and an internally-tangent spiral blade. When the air pressure of the natural gas is reduced, the air cylinder pushes the internally-tangent spiral blade downwards through the bearing, the internally-tangent spiral blade rotates along the spiral groove in the downward pushing process, the path of the natural gas passing through the inner spiral blade is reduced, the centrifugal force of the natural gas is increased along with increase, and gravel in the natural gas can be thrown out of the sand removing barrel. Due to the fact that the pressure of the natural gas is reduced, a vortex-shaped gas column is formed on the shaft portion of the desanding cylinder and begins to diffuse, when the natural gas passes through the internally-tangent spiral blade, the internally-tangent spiral blade can guide the diffused gas column, the diffused gas column is gathered towards the shaft portion of the desanding cylinder again, the stability of the gas column is improved, and the influence of the gas column on gravel is reduced.

The invention relates to the technical field of leakage detection, and discloses an SF6 gas pressure early warning method, device and equipment, a storage medium and a program product.The SF6 gas pressure early warning method comprises the steps that for target electrical equipment, environment temperature data of the environment where the target electrical equipment is located is used for conducting environment compensation on measured pressure data of SF6 gas, and compensation pressure data is obtained; calculating a corrected pressure change rate based on the compensated pressure data at the plurality of moments; if the compensation pressure data at the current moment does not meet the pressure standard and / or the correction pressure change rate at the current moment does not meet the change rate standard, feature matching is carried out based on the data set at the current moment and the data set at the historical moment, and a target data set meeting the matching range is determined from the data set at the historical moment, taking the SF6 gas leakage condition at the historical moment corresponding to the target data set as the SF6 gas leakage condition at the current moment; and performing early warning based on the SF6 gas leakage condition at the current moment. According to the invention, the accuracy of SF6 gas early warning can be improved.

The invention provides a pressure control system of an MOCVD (Metal Organic Chemical Vapor Deposition) reaction cavity and MOCVD epitaxial equipment, and the system comprises a cavity in which a reaction cavity is defined; the exhaust pipeline is communicated with the reaction cavity; the first pressure gauge is fixed on the cavity body, and the first pressure gauge is used for detecting the gas pressure in the reaction cavity; the exhaust valve is configured to control the exhaust flow through the opening degree of the valve; the vacuum pump is used for extracting gas in the reaction cavity; the mass flow controller is configured to be capable of detecting and controlling the flow of gas flowing into the reaction cavity; and the controller is configured to control the valve opening degree of the exhaust valve and / or control the gas inlet flow of the mass flow controller according to the gas pressure detected by the first pressure meter. According to the pressure control system of the MOCVD reaction chamber, the first pressure meter, the exhaust valve and the mass flow controller are arranged on the chamber body, and the gas pressure can be adjusted in real time, so that the product quality can be effectively improved.

The invention provides a demonstration experiment device for an internal friction effect in gas fluid mechanics, and belongs to the technical field of teaching demonstration devices. The problem that a traditional teaching aid is single in function, dispersed in data and insufficient in visualization, so that the experiment effect is abstract is solved. Comprising a main body shell, the main body shell is hermetically connected with a vacuum cover, the vacuum cover is filled with fluorescent powder, and the vacuum cover is connected with an air extractor through an air valve; the middle of the main body shell is an area communicated with the interior of the vacuum cover, the periphery of the main body shell is a sealed shell, the middle of the main body shell is provided with an impeller rotating speed adjusting mechanism, the top of the sealed shell of the main body shell is provided with a display screen, and the sealed shell of the main body shell is internally provided with a high-speed brushless motor and a distance adjusting mechanism; by adjusting the air pressure, the rotating speed of the impeller and the distance, students can observe the conversion of gas flow from laminar flow to turbulent flow and the stagnation phenomenon of the impeller in a vacuum environment, and the linear relation between internal friction and gas density is verified.

The invention relates to a test device and method for detecting the permeability of a polar plate, and the device comprises a mold which is used for bearing and sealing a sample and is provided with an air inlet and an air outlet; the gas supply source is communicated with the gas inlet of the mold through a gas inlet pipeline and is used for providing gas for testing for the mold; the pressure regulating filter is arranged on the gas inlet pipeline and is used for regulating the gas pressure of the gas supply source and filtering the gas; the differential pressure gauge is used for detecting upper and lower end pressure difference of the sample; and the gas flow meter is arranged on a gas outlet pipeline communicated with the gas outlet and is used for detecting the flow of gas penetrating through the sample. The device quantitatively detects the permeability of the lead-acid storage battery pole plate based on the gas pressure difference, can also be used for detecting the permeability of other porous materials, and is wide in application range.

The invention relates to ore pulp mother liquor separation equipment, and belongs to the technical field of ore pulp treatment. Comprising an equipment body which forms a cavity; the flow stabilizing assembly is arranged in the cavity in a sliding mode; the cavity is divided into a first cavity body and a second cavity body which are independent from each other by the flow stabilizing assembly; the first cavity is connected with a liquid inlet assembly; the flow stabilizing assembly floats along the axis of the equipment body under the control of the liquid level height of the mother liquid in the first cavity; the second cavity is provided with an air pressure control assembly, the air pressure control assembly is configured to release air in the second cavity, and the air release flow Q is in negative correlation with the pressure P in the second cavity; and the ultrasonic assembly is arranged at the bottom of the equipment body. Under the condition of high liquid level, the flow stabilizing assembly can more effectively inhibit the fluctuation of the liquid level, so that the mother liquor separation process is stable and efficient, and the problem of poor separation effect caused by the fluctuation of the liquid level due to ultrasonic waves in the prior art is solved.