3520 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 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 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 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.

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 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 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.

A foamed liquid dispensing system includes a container for receiving a liquid to be dispensed connectable to, and removable from, a gas charging unit. The gas charging unit includes a gas compressor, gas pressure sensing means, a control unit and a user interface. The user interface permits a user to input a desired final gas pressure from a minimum value to a maximum value in discrete steps. The control unit instructs the gas compressor to charge the container with gas to the desired final pressure. The gas pressure is continuously monitored and the flow of gas into the container is stopped once the desired final gas pressure has been reached. The user interface displays the gas pressure in the container as the charging cycle proceeds. Once charged with gas and removed from the gas charging unit, the container substantially retains the final desired gas pressure until the liquid is dispensed.

The invention discloses a pneumatic sampling device and method for high-water-content muddy soft soil, and relates to the technical field of dredged sludge sampling devices.The pneumatic sampling device comprises a sampling cavity, a sampling opening is formed in the side wall of the sampling cavity, a flexible sampling container is arranged in the sampling cavity, and the opening end of the flexible sampling container faces the sampling opening; the valve plate is slidably connected to the outer side of the sampling opening; the gas transmission rod is fixed on the sampling cavity and is communicated with the interior of the sampling cavity; the gas path control mechanism is communicated with the interior of the sampling cavity through a gas transmission rod; the pneumatic driving part is arranged on the sampling cavity and is pneumatically connected with the gas path control mechanism, and the driving end of the pneumatic driving part is in transmission connection with the valve plate; wherein the pneumatic driving part can be driven by the gas path control mechanism to drive the valve plate to move to open or close the sampling port, and the gas pressure in the sampling cavity can be changed by the gas path control mechanism, so that the flexible sampling container expands to suck a soil sample, or the flexible sampling container contracts to discharge the soil sample.

The invention discloses a hand riveter which is stable in clamping force on rivets and high in rivet pulling efficiency. The hand riveter comprises a clamping sleeve, a clamping jaw and a rivet arranging pipe assembly, the rivet arranging pipe assembly is arranged in the clamping sleeve, the clamping jaw is arranged in the clamping sleeve, the end of the clamping sleeve is provided with an abutting face facing the clamping jaw, the rivet arranging pipe assembly comprises an ejector rod and a rivet arranging pipe, the ejector rod is fixedly connected to the end of the rivet arranging pipe, and the clamping jaw is located between the abutting face and the ejector rod; the clamping sleeve is provided with a gas chamber, the gas chamber is located on the side, away from the clamping jaw, of the ejector rod, the gas chamber is filled with compressed gas, and the compressed gas is used for providing thrust towards the clamping jaw for the ejector rod; when the clamping sleeve moves towards the tail end, the ejector rod drives the clamping jaw to be tightly attached to the abutting face under the action of air pressure, and the abutting face abuts against the periphery of the clamping jaw so that the clamping jaw can clamp the nail rod. Diameter Phi1 of gas chamber, moving distance L of ejector rod and outer diameter Phi2 of nail arranging pipe, satisfying: # imgabs0 #

The utility model relates to the technical field of detection devices, and discloses a collection device for gas detection, which comprises a shell, a sliding plate is slidably mounted in the shell, two rectangular columns are fixedly mounted at the top of the sliding plate, tooth grooves are respectively formed in the right sides of the two rectangular columns, a mounting groove is formed in the right side of the shell, and the tooth grooves are fixedly mounted in the mounting groove. A rotating rod is rotationally mounted on the inner wall of the mounting groove, and the outer wall of the rotating rod is fixedly sleeved with a door plate and a first gear. When a rectangular column moves upwards, linear motion is efficiently converted into rotation motion of a gear through a meshing mechanism of a tooth groove and the gear, and it is ensured that a door plate can rapidly and stably rotate so as to respond to internal air pressure changes. The rotating angle and speed of the door plate can be accurately controlled, and when too much gas is collected in the shell and the gas pressure rises to a certain degree, the door plate can automatically rotate to open the gap.

The utility model relates to the field of fuel gas pressure regulation, in particular to a double-layer noise reduction valve cage and a regulating valve, which comprises an inner-layer valve cage, a plurality of first noise reduction holes, a second-layer valve cage and a third-layer valve cage, the outer-layer valve cage is arranged outside the inner-layer valve cage in a sleeving manner and fixedly connected with the inner-layer valve cage, and a plurality of second silencing holes which are arranged according to a second rule are formed in the outer-layer valve cage; and the inner-layer valve cage and the outer-layer valve cage are coaxially arranged. According to the utility model, the inner-layer valve cage is used for preliminarily dispersing pressure waves and noise of fluid through the plurality of first silencing holes arranged according to the first rule, the outer-layer valve cage is used for further absorbing and scattering residual noise generated by the inner-layer fluid through the second silencing holes, and the inner-layer valve cage and the outer-layer valve cage are coaxially arranged; the additional flow resistance generated when fluid penetrates through different layers can be reduced, and meanwhile the continuity of a flow channel is guaranteed. Under the conditions of high pressure difference and large flow, noise of the regulating valve is effectively reduced, it is ensured that the noise level does not exceed 85 decibels, and the requirements of specific application occasions are met.

The invention discloses high-pressure fuel gas pressure regulating equipment in the technical field of fuel gas pressure regulating equipment, which comprises a valve body, and a valve rod, a reset spring and a gas inlet box which are arranged on the valve body, a valve seat and a diaphragm are arranged on the valve rod, the gas inlet box is communicated with a gas outlet of the valve body through a guide pipe, and a detection assembly is arranged in the gas inlet box; the detection assembly comprises an air pressure detection piece and a displacement detection piece, and a warning indicator is arranged on the air inlet box and used for giving an alarm when the air pressure detection piece detects that the air pressure below an inner cavity of the air inlet box is lower than a threshold value and the displacement detection piece does not detect that the valve rod moves. The high-pressure gas pressure regulating equipment is detected through the detection assembly, when the air pressure detection piece detects that the air pressure below the inner cavity of the gas inlet box is lower than a threshold value and the displacement detection piece does not detect that the valve rod moves, the warning indicator gives an alarm to remind a user, so that problems can be found in time, further deterioration of the faults is avoided, and the service life of the user is prolonged. And the probability of potential safety hazards is reduced.

The invention relates to the technical field of geological surveying and mapping, and discloses urban three-dimensional geological surveying and mapping equipment which comprises a placement table, three supporting legs are rotatably connected to the inner wall of the placement table, air pressure sleeves are arranged at the bottoms of the three supporting legs, and fixing rings are fixedly connected to the inner walls of the air pressure sleeves. An operator supports the surveying instrument through the supporting assembly, then rotates the air pressure sleeve to enable the air pressure sleeve to be perpendicular to the ground, finally places the extrusion assembly to descend, enables the piston rod to make contact with the ground, enables the piston rod to extrude air in the air pressure sleeve and enables the air pressure to be increased, and generated ground vibration can be transmitted to the piston rod when the surveying instrument conducts surveying around a large number of vehicles. Kinetic energy is absorbed and vibration is relieved through compressibility of high-pressure gas at the top of the piston rod, so that vibration borne by the surveying instrument is reduced, and frequent vibration of the surveying instrument and influence on surveying and mapping accuracy when the surveying instrument is used for surveying and mapping in an area with many running vehicles are effectively prevented.

The utility model discloses a fuel gas filter of a fuel gas pressure regulating pry capable of quickly discharging sewage. The fuel gas filter comprises a protective shell for mounting and a mounting cover fixedly mounted at the upper end of the protective shell, bolts are installed at the left, right, front and rear ends of the mounting cover, a reciprocating screw rod is installed in the middle of the mounting cover, a motor is installed at the upper end of the reciprocating screw rod, a connecting rod is installed on the outer side of the reciprocating screw rod, brushes are arranged at the left and right ends of the connecting rod, and a connecting block is connected to the lower end of the reciprocating screw rod; a supporting frame is arranged on the outer side of the connecting block, a fixing rod is fixed to the lower end of the connecting block, a scraping plate is installed at the lower end of the fixing rod, and filter screen barrels are connected to the left, right, front and rear ends of the supporting frame. According to the fuel gas pressure regulating pry fuel gas filter capable of rapidly discharging the sewage, the filtering device can be conveniently and rapidly cleaned, the filtering device can be conveniently detached and replaced, and cleaned stains can be conveniently and rapidly discharged.

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.

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 invention provides an electric proportional valve and a control method, the electric proportional valve comprises a valve body and a control unit, and the valve body is provided with a gas inlet pipeline connected with a gas source, a gas outlet pipeline connected with a gas load and a gas exhaust pipeline communicated with the external environment; the control unit adjusts the proportion of the gas amount entering the gas outlet pipeline and the gas exhaust pipeline from the gas inlet pipeline based on closed-loop feedback control; a gas release pipeline is further arranged in the valve body, and part of gas in the gas outlet pipeline can be discharged to the external environment in the mode that the gas amount participating in closed-loop feedback control in the gas outlet pipeline is reduced. According to the electric proportional valve, the air pressure oscillation phenomenon of the air outlet pipeline under the low-flow and high-frequency switching air using demand scene can be remarkably reduced, and rapid, accurate and stable tracking of the target air pressure is achieved.

The invention discloses a ring main unit pressure relief device and a ring main unit thereof, and relates to the technical field of ring main units, the ring main unit pressure relief device comprises a mounting plate, an air outlet piece is fixedly mounted on the surface of the mounting plate, the bottom of the air outlet piece is fixedly connected with an air storage cylinder, the air outlet end of the air outlet piece is fixedly connected with a bent pipe, and the bent pipe is fixedly connected with a pressure relief valve. A buffer part is fixedly installed on the top of the bent pipe, a pressure sensor is fixedly installed on the surface of the installation plate, and a limiting part, an air blocking part and a releasing part are installed on the surface of the installation plate. According to the ring main unit pressure relief device, through cooperation of the gas blocking piece, the release piece, the limiting piece and the pressure sensor, the gas pressure in the ring main unit is monitored in real time, and pressure relief and gas relief are conducted in time. The ring main unit comprises a cabinet body and a cabinet door rotatably installed on the surface of the cabinet body, and an observation window and a control panel are fixedly installed on the surface of the cabinet door.

According to the overflow valve with the pressure relief function, a limiting structure is arranged in an overflow pressure adjusting cavity, by limiting the moving distance of an overflow piston, when the pressure at the front end of a pipeline is too large, the pressure relief piston is pushed to move, and then a pressure relief valve is opened; according to the pressure relief valve, the overflow piston is arranged in the pressure relief channel, so that overlarge gas pressure passes through the pressure relief channel, the pressure relief valve port and the cavity between the pressure relief piston and the overflow piston and then is exhausted through the pressure relief exhaust port, the gas pressure at the front end of a pipeline is reduced, that is, overlarge pressure in the corresponding pipeline is reduced, and the problem of gas explosion of the pipeline is avoided.

The invention provides a compressor pressure relief structure, a compressor and an air conditioner. The compressor pressure relief structure comprises a first-stage compression assembly and a second-stage compression assembly. A first pressure relief channel is formed in the partition plate assembly, an assembly avoiding groove and a second pressure relief channel are formed in the second-stage air cylinder, at least part of structure of an opening and closing element is arranged in the assembly avoiding groove, and the opening and closing element can move in the assembly avoiding groove and the second pressure relief channel so that the second pressure relief channel can be communicated with or disconnected from the first pressure relief channel; the opening and closing element comprises a first end and a second end which are opposite to each other, the first end is opposite to the first pressure relief channel so as to bear the gas pressure of the first pressure relief channel, the second-stage air cylinder is further provided with a first back pressure channel, and the first back pressure channel can introduce exhaust gas of the compressor into the assembly avoiding groove; and the pressure acts on the second end so as to apply pressure to the second end. According to the compressor, the technical problem that in the prior art, a rivet pressure relief valve plate structure is adopted for a compressor, and flutter occurs can be solved.

The utility model discloses an extrusion molding device which comprises a rack, an extrusion charging barrel is arranged on the rack, the extrusion molding device further comprises a pressure reducing mechanism and an exhaust mechanism, the pressure reducing mechanism and the exhaust mechanism are arranged on the extrusion charging barrel, and the exhaust mechanism is arranged at the side end of the pressure reducing mechanism; the pressure reducing mechanism comprises a first buffering frame, a buffering pressing plate and a second buffering frame, the buffering pressing plate is slidably connected to the side wall of the inner side of the first buffering frame, a cavity of the first buffering frame and the buffering pressing plate is set as a first cavity, and a cavity, close to one side of the extrusion material barrel, of the buffering pressing plate is set as a second cavity; the exhaust mechanism comprises a ventilation container, a breathable film and a third vacuum pump, and a plurality of square grooves are formed in the extrusion charging barrel. According to the extrusion molding device, negative pressure is generated in a ventilation container through a third vacuum pump, and gas in a cavity of an extrusion charging barrel is adsorbed in cooperation with a gas-permeable film, so that the gas pressure in a machine head is reduced to a certain extent, and the countercurrent phenomenon is improved.

The utility model discloses a building gas leakage monitoring device based on pressure signal, which comprises a shell, a display arranged on the shell, a connecting pipe positioned in the shell, an electromagnetic valve, a pressure sensor and a controller, the electromagnetic valve and the pressure sensor are arranged on the connecting pipe, the controller is connected with the pressure sensor, the electromagnetic valve and the display, and the display is connected with the controller. The controller is connected with a power supply, and two pipe ends of the connecting pipe form connecting ports on the shell. The gas leakage monitoring device is installed on a gas main pipeline behind the pressure regulating box, gas pressure data are collected through the pressure sensor, whether the gas pipeline leaks or not is judged through the controller, gas leakage can be effectively monitored, and gas use safety is improved; the system can provide guidance basis for building low-pressure gas pipeline maintenance operation and accident early warning, and can be widely applied to the field of safety operation of low-pressure gas pipelines.

The utility model discloses a connecting valve and a combustion appliance. The connecting valve comprises a valve body, the valve body is provided with a gas output channel, a first input port, a second input port and a circulation cavity, and the gas output channel communicates with the circulation cavity through a communicating port; the first communication structure comprises a connecting assembly and a sealing assembly, the connecting assembly is arranged at the first input port of the valve body and used for being connected with a first gas cylinder, and the sealing assembly is arranged in a sliding mode relative to the cavity wall of the circulation cavity and can open the first input port under the action of the gas pressure of gas in the first gas cylinder so as to convey first gas into the gas output channel; and the second communication structure is mounted at the second input port, is used for being connected with a second gas cylinder, and can open the second input port under the action of the gas pressure of the gas in the second gas cylinder so as to convey the second gas into the gas output channel. According to the connecting valve, different gas cylinders can be connected through the first communicating structure and the second communicating structure, and the practicability of the connecting valve is improved.

The invention provides a diaphragm bubble point pressure testing device and a testing method. The diaphragm bubble point pressure testing device and the testing method are used for solving the technical problems that an existing diaphragm bubble point pressure testing device is complex in structure, at least two persons need to be matched for operation during testing, and air tightness is attenuated due to the fact that a drainage hole is independently formed or the resetting process is long due to the fact that drainage is detached. According to the diaphragm bubble point pressure testing device, an air cavity is arranged to be of a barrel-shaped structure with the bottom being a spherical surface, a liquid cavity is arranged to be of a hollow columnar structure with the upper portion and the lower portion being open, and a diaphragm to be tested is clamped between the air cavity and the liquid cavity in a sealed mode; the position of the air inlet nozzle is specially designed, so that the uniformity of an air pressure field in the air cavity can be ensured, and the residual liquid can be discharged through the air inlet nozzle when the air cavity is inclined by a certain angle by ingeniously combining with the rotating air cavity, so that the arrangement of an independent drainage hole is effectively avoided, and the air tightness of the testing device is ensured; and the whole testing device does not need to be disassembled, and the drainage time is reduced to several seconds from half an hour after the device is reset.

The utility model belongs to the technical field of pressure and flow stabilizing devices, and particularly relates to a gas pressure and flow stabilizing device which comprises a valve body, a pressure regulating valve module, a gas flow stabilizing valve module and a flow regulating valve module. A pressure stabilizing structure cavity and a flow stabilizing structure cavity are formed in the valve body, and the pressure regulating valve module is arranged in the pressure stabilizing structure cavity and divides the interior of the pressure stabilizing structure cavity into a lower air inlet cavity and an upper pressure stabilizing cavity. The airflow stabilizing valve module is arranged in the flow stabilizing structure cavity; the flow regulating valve module is arranged on the three-way connecting pipeline and is used for regulating the flow of the gas conveyed to the flow stabilizing structure cavity; the pressure regulating valve module is linked with the air flow stabilizing valve module, so that the demand quantity of air during welding can be reduced to the minimum through automatic regulation of air pressure and air flow in the pressure and flow stabilizing device under different pressures, and meanwhile, the requirement of air consumption during welding can be met.

The invention relates to the technical field of filtering devices, and discloses compressed air self-cleaning type filtering equipment and a back flushing method, the compressed air self-cleaning type filtering equipment comprises a filtering unit, and the filtering unit comprises a filtering net; the back flushing unit comprises a main back flushing mechanism and an auxiliary back flushing mechanism, the main back flushing mechanism conducts back flushing on the filter screen through compressor finished product gas, and the auxiliary back flushing mechanism comprises a gas storage tank and an inflation pump and conducts back flushing on the filter screen through gas stored in the gas storage tank; the adjusting unit comprises a control valve and a sealing plate, the adjusting unit further comprises a transmission mechanism, and when the sealing plate rotates, the working state of the control valve is changed through the transmission mechanism. According to the back flushing device, the auxiliary back flushing mechanism is arranged to perform back flushing on the filter screen, when compressed air introduced by the main back flushing mechanism is insufficient, the auxiliary back flushing mechanism is switched, high-pressure air in the air storage tank is utilized to perform back flushing on the filter screen, and the situation that the cleaning effect is poor due to insufficient air pressure is avoided.

The invention discloses a one-way adjustable nozzle for gas immersion jet. The one-way adjustable nozzle comprises a spring chamber and a pressure chamber. A pressure spring and a pressure relief hole are arranged in the spring chamber, the pressure chamber comprises a gas inlet, a connecting rod and a nozzle plug, and a sliding block is arranged on the boundary of the two chambers. According to the invention, in a non-starting stage and an air inlet initial stage, reaction immersion jet flow bath liquid is prevented from flowing back into the nozzle to corrode or solidify and block the nozzle, and condensation immersion jet flow bath liquid is prevented from further flowing into a pipeline to cause a water hammer or a phenomenon that a measurement sensor is damaged due to water inlet; therefore, the service life of experimental equipment is prolonged and the experimental safety is enhanced. Furthermore, the device is simple in structure, does not need other power supplies, is high in reaction speed, is high in precision, is high in bearing capacity, can achieve the precise blocking of bath lotion with different pressures, and meets the application demands of different gas pressure working conditions.

The utility model discloses a relay. The relay comprises a packaging cavity and a valve assembly. An inner cavity is formed in the packaging cavity, and a pressure relief hole communicated with the inner cavity is formed in the cavity wall of the inner cavity; the valve assembly comprises a valve plate provided with a blasting part and a connecting part, the connecting part is connected to the outer periphery of the blasting part in a surrounding mode and connected to the cavity wall of the inner cavity, and the structural strength of the blasting part is smaller than that of the connecting part; the blasting part is configured to be broken to open the pressure relief hole when the gas pressure in the inner cavity is larger than or equal to a threshold value.