3815 results about "High pressure gas" patented technology

The present invention relates to the technical field of waste heat recovery equipment, and specifically discloses a waste heat recovery device for flue gas in a thermal power plant. It includes a box body with an upper smoke chamber, a heat exchange chamber and a lower smoke chamber inside. A number of smoke pipes connecting the upper smoke chamber and the lower smoke chamber are fixed in the heat exchange chamber; above the smoke pipes, there is a piston cylinder fixed by the box body; the upper end of the piston cylinder is connected to a high-pressure gas supply pipe, and a piston is arranged inside. The piston is connected with a scraping head through a push rod; side holes are provided on the push rod; when the high-pressure gas drives the piston to move downward, the scraping head moves along the inner wall of the smoke pipe to scrape off the ash slag. The waste heat recovery device for flue gas in this thermal power plant has a cleaning function and a better cleaning effect, high heat exchange efficiency and good waste heat recovery effect. The waste heat recovery device for flue gas in this thermal power plant can be automatically cleaned without disassembling components, is fast and efficient, and can be operated online. The ash slag scraped off during the cleaning process can be centrally recovered, avoiding re-mixing into the flue gas again, reducing the workload in the flue gas dust treatment link, and saving the subsequent environmental protection treatment cost.

The invention relates to the technical field of wharf loading and unloading, and discloses a bulk grain wharf ship loading and unloading dual-purpose machine which comprises a conveyor main body and a frame, a discharging hopper is fixedly connected to the top of the conveyor main body, the bottom of the conveyor main body is rotationally connected with the outer wall of the frame, and a supporting frame is rotationally connected to the bottom of the conveyor main body; when a ship needs to be unloaded, a conveying pipeline enters a cabin through a moving assembly, then when a first motor is started to enable a rotating rod to rotate, a connecting rod can be driven to rotate, a concave-convex ring rotates, an extrusion pushing assembly ascends and extrudes gas, and finally high-pressure gas is sprayed out towards grain particles and permeates into gaps of the grain particles to form an air cushion effect; the friction force among grain particles is reduced, the mobility of the grain particles is enhanced, the grains are conveniently conveyed by the spiral auger, the situation that the grains are accumulated at the bottom of the spiral auger due to poor mobility of the grain particles, the grains are extruded and are prone to being damaged is effectively prevented, and the integrity of the grain particles is ensured.

The invention belongs to the technical field of capacitor protection, and particularly discloses an ultralow-temperature ox horn capacitor which comprises an aluminum capacitor shell, a base plate is fixed between the inner walls of the aluminum capacitor shell, a sealing plate is fixed to the position, close to the bottom edge, between the inner walls of the aluminum capacitor shell, and a bent pull-up edge is arranged on the outer surface of the aluminum capacitor shell. The bent pull-up edge is located between the base plate and the sealing plate, and a neutralizing device is arranged between the bottom of the base plate and the top of the sealing plate; according to the aluminum capacitor shell, the explosion-proof cavity and the bent pull-up edge are arranged in the aluminum capacitor shell, so that the volume of the explosion-proof cavity is increased by straightening the bent pull-up edge under the action of high-pressure gas when the high-pressure gas is generated in the aluminum capacitor shell, the high-pressure gas is buffered, and a circuit is cut off at the same time; and the driving assembly is triggered to position the capacitor, and meanwhile, the neutralizing device is triggered to neutralize the generated corrosive gas and then discharge the corrosive gas.

The invention discloses a pilot-operated type self-driving fluid release valve, and belongs to the field of control valves. Comprising a main valve assembly, a pilot valve assembly and a one-way valve assembly. Valve bodies of the pilot valve assembly and the one-way valve assembly are integrated on a main valve body of the main valve assembly; the main valve assembly comprises a main valve body, a main valve piston, a main valve element and a main valve spring. The pilot valve assembly comprises a pilot valve air control opening, a pilot valve inlet, a pilot valve outlet channel and a pilot valve pressure relief opening. The one-way valve assembly is arranged at an outlet of the main valve and used for blocking medium backflow. Through mechanical configuration reconstruction and system integration innovation, the technical contradiction of the liquid rocket engine high-pressure gas control valve in weight, response speed and reliability is thoroughly solved.

The invention relates to the technical field of valve leakage detection, and particularly discloses an ultrahigh pressure gas valve leakage detection method and system. According to the method, a unified leakage feature vector is obtained through multi-source acquisition and processing; capturing a time sequence dependency relationship, and determining a micro leakage mode; carrying out abnormal peak detection to obtain a preliminary leakage probability; combining the initial leakage probability with real-time environmental parameters, and dynamically adjusting a judgment standard; comparing the unified leakage feature vectors through a judgment standard, fusing position coordinate triangulation positioning, judging whether micro crack leakage occurs or not, and obtaining leakage position estimation; the historical data sequence is fused, the micro crack development trend is predicted, and the early warning level is determined; and generating a corresponding response signal according to the early warning level, and outputting micro crack leakage early warning. Multi-source data fusion, dynamic threshold adjustment and position prediction can be carried out, the accuracy and robustness of micro crack leakage detection are remarkably improved, and efficient guarantee is provided for safe operation of a pipeline.

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 discloses a spiral steel pipe weld defect detection device applied to X-ray detection, and relates to the field of steel pipe weld detection, the spiral steel pipe weld defect detection device comprises a base and a movable platform mounted at the upper end of the base, and the upper end of the base is provided with a steel pipe; a stirring roller and a lifting roller are rotationally installed at the upper end of the movable platform and located below the steel pipe fitting. According to the spiral steel pipe welding seam defect detection device applied to X-ray detection, high-pressure wind power is transmitted to the flow dividing pipeline through the pressurizing air outlet by the air blower, and the transmitted high-pressure air carries pressure to penetrate through an opening gap in the surface of the lifting roller to impact on the surface of a steel pipe; the cleaning brush at the upper end is driven to move back and forth in a reciprocating manner in cooperation with limiting of a movable plate and a limiting rod, so that surface residual impurities generated by contact of a pressurizing air outlet and a steel pipe fitting are subjected to auxiliary guiding and removing work, and flaw detection can be more accurate.

The invention belongs to the technical field of natural gas transportation and distribution filtration of natural gas stations, and relates to a filter and a filter element backwashing method thereof without stopping natural gas transportation and distribution filtration. The filter comprises a main cylinder, a main filter element and a backwashing device, wherein the backwashing device comprises an air blowing cylinder arranged in the main filter element, a high-pressure hose used for conveying high-pressure gas into the air blowing cylinder and a driving mechanism used for driving the air blowing cylinder to reciprocate in the main filter element in the axial direction; the air blowing cylinder is of a cylindrical structure with two closed ends, and a plurality of air blowing holes are formed in the side wall; the high-pressure hose is located in the main filter element, the bottom end of the high-pressure hose is connected to the top end of the air blowing cylinder, the top end of the high-pressure hose is externally connected with a high-pressure air supply source, and high-pressure air entering the air blowing cylinder is blown out through the air blowing holes to backwash the main filter element from inside to outside. The air blowing cylinder of the filter can perform movable backwashing in the main filter element, so that the whole main filter element is helped to recover the filtering effect, and the backwashing device can independently operate to backwash the main filter element while the filter continuously filters natural gas.

The invention discloses a power transmission line insulator dual defense system and method, and belongs to the technical field of power transmission line maintenance, in the system, a power supply subsystem generates, stores and conveys high-pressure gas, and a primary defense subsystem and a secondary defense subsystem are respectively communicated with the power supply subsystem through high-pressure conveying hoses to obtain a high-pressure gas source; the first defense subsystem is arranged around an insulator of the power transmission line and forms an annular air curtain to prevent rain and snow from being attached to the surface of the insulator; the secondary defense subsystem detects and removes rain and snow breaking through the annular air curtain; the photovoltaic power supply subsystem is used for providing power for the whole defense system; all the subsystems are electrically connected with the intelligent control subsystem, and the intelligent control subsystem is used for coordinating starting, operation and parameter adjustment of all the subsystems. The problems that an existing anti-icing technology is high in energy consumption and slow in response, an icing micromechanism is difficult to capture, and protection is insufficient due to the fact that extreme working conditions are difficult to reproduce are solved, and efficient blocking and removing of rain and snow are achieved.

The invention provides an intelligent fuse, and belongs to the technical field of circuit protection, and the intelligent fuse is characterized in that an upper housing is provided with at least one excitation chamber, the excitation chamber is internally provided with at least one excitation part and at least one impact part, and the excitation part releases high-pressure gas when receiving any one of an external trigger signal and an internal trigger signal; the lower shell is provided with at least one cooling cavity; the current-conducting plate is arranged between the upper shell and the lower shell, and the impact part moves towards the direction where the cooling cavity is located under the thrust action of the high-pressure gas so as to cut off the current-conducting plate; the self-control module is arranged outside the shell and comprises a current detection unit and a processing unit, and the current detection unit is used for detecting a current signal on the conductive plate; the processing unit is used for generating an internal trigger signal according to the current signal. The beneficial effects of the invention are that a dual-trigger mechanism and redundancy design of an internal trigger signal and an external trigger signal are adopted, so that normal action can still be ensured when any signal fails, and the breaking reliability is improved.

The utility model relates to the technical field of livestock and poultry manure fermentation, in particular to a fermentation device for quickly decomposing livestock and poultry manure, which comprises a fermentation tank mounted on a bottom plate, and a pressure relief mechanism for automatically adjusting the pressure in the fermentation tank is arranged on the fermentation tank. A fermentation mechanism for mixing livestock and poultry manure to promote fermentation is arranged in the fermentation tank. The telescopic spring is impacted by high-pressure gas to extend, so that the rubber pad is pushed to slide to the position below the pressure relief hole formed in the pressure relief pipe, the pressure is discharged through the pressure relief hole, and the phenomenon that the tank body is broken due to the fact that the pressure in the fermentation tank is too high is avoided; according to the gas purification device, harmful substances, dissolved in water, in gas are purified, peculiar smell can be removed to a certain degree, the peculiar smell in the gas is adsorbed and removed again in cooperation with the activated carbon plate, and therefore the situation that the peculiar smell of the fermentation gas is dispersed in a fermentation place and pollutes the environment is avoided.

The invention provides an electric pressure cooker. The electric pressure cooker comprises a cooker body and a cooker cover detachably arranged on the top of the cooker body. An air cavity is formed in the cooker cover, and an exhaust valve communicated with the cooker body is mounted in the air cavity; a first air hole for exhausting air is formed in the top of the air cavity; a second air hole and a third air hole are formed in the bottom of the air cavity; the pot body is provided with a second air channel and a third air channel, the air outlet end of the second air channel is located in the middle of the pot body, and the air outlet end of the third air channel is located at the bottom of the pot body; an air exchange mechanism and an air release mechanism are mounted at the air cavity; the ventilation mechanism changes the unblocking and blocking states of the air holes through adjustment, and only outward exhaust is achieved; the gas release mechanism can open the gas release valve through adjustment, so that high-pressure gas in the pot body is discharged; the exhaust direction of high-pressure air leakage can be adjusted and changed, different use environments are met, and the applicability is improved.

The invention discloses a multi-mechanical-arm collaborative insulator mold cleaning method which is specifically implemented according to the following steps that firstly, an insulator mold cleaning assembly is arranged, the assembly comprises an insulator mold to be cleaned and a blowing mechanical arm installed right in front of the insulator mold, and a high-pressure nozzle is arranged at the tail end of the blowing mechanical arm; the high-pressure nozzle is driven by an air pressure system, the air pressure system is connected with the blowing mechanical arm through a pipeline, provides high-pressure gas for the blowing mechanical arm and executes the blowing action, and a pressure sensor is further arranged on the blowing mechanical arm; the device further comprises a projection detection mechanical arm located above the side of the insulator mold, and the projection detection mechanical arm integrates a stripe projector and a camera and is used for detecting the surface cleanliness. The device further comprises a dust-sticking mechanical arm and the like. Then self-adaptive dust blowing is carried out, the mold is cleaned through a dust-sticking mechanical arm, and finally the cleaning effect is evaluated. The problems that in the prior art, the detection precision of the high-reflection three-dimensional complex curved surface is insufficient, and regulation and control in the cleaning process are extensive are solved.

A bleed system including a jet pump system configured to provide a supply gas comprising at least one of a higher pressure gas, a lower pressure gas, or a mixture of the higher pressure gas and the lower pressure gas. A needle body defines a throat region between a nozzle wall and the needle body. The needle body is configured to cause a gap between a rear needle surface of the needle body and the nozzle wall to decrease as the rear needle surface extends toward the throat region. The jet pump system is configured to discharge the higher pressure gas through the throat region and mix the higher pressure gas and the lower pressure gas in a mixing portion of an exhaust portion.

The invention provides low-temperature supersonic airflow collision ultramicro equipment, which belongs to the field of material crushing and processing, and comprises a feeding device, an airflow collision device, a closed-loop type circulation grading device, a material receiving device, a gas cooling device and a gas inlet device, and the gas inlet device is used for providing a high-pressure gas source for the equipment; the gas cooling device cools the high-pressure gas to a preset low temperature, and then the high-pressure gas is fed into the gas flow collision device after being subjected to pressure regulation through the gas feeding pipeline; the airflow collision device comprises a collision chamber and at least one pair of opposite nozzles, the horizontal distance between the paired nozzles can be adjusted, the air supply pipeline and the feeding pipeline are connected with the nozzles after being intersected, and high-pressure air is sprayed out through the nozzles to form supersonic jet flow to drive materials to collide with each other in the collision chamber. And the collided materials are subjected to closed-loop circulation classification and then enter a material receiving device, and large particles are subjected to circulation collision crushing again. The ultramicro equipment disclosed by the invention can be used for crushing various plant raw materials into 1-10 microns, and has a good application prospect.

The invention belongs to the technical field of transformers, and discloses an explosion-proof sealed oil-immersed transformer which comprises an oil-immersed transformer body, a mounting frame is fixedly mounted at the top of the oil-immersed transformer body, an oil conservator is fixedly mounted on the mounting frame, the bottom of the oil conservator communicates with an explosion-proof oil pipe, and the explosion-proof oil pipe communicates with an oil storage tank. The explosion-proof oil pipe penetrates through and extends into the oil-immersed transformer main body, an oil pump is arranged on the explosion-proof oil pipe, an automatic pressure relief mechanism is arranged on the oil-immersed transformer main body, and the automatic pressure relief mechanism comprises a pressure relief valve cylinder. According to the scheme, through a spring-sealing plug linkage structure in the automatic pressure relief mechanism, when the internal pressure exceeds a threshold value, a sealing plug is pressed to move upwards, a pressure relief hole communicates with a pressure relief cavity, high-pressure gas is directionally exhausted through a one-way exhaust valve, and shell burst is avoided; after the pressure recovers, the reset spring automatically resets the sealing plug, the sealing performance is maintained, external impurities are prevented from invading, manual intervention is not needed, and repeated and reliable pressure relief is achieved.

The utility model relates to the technical field of metal mechanical property detection testing equipment, in particular to a metal material and hydrogen environment compatibility testing device which comprises an upper clamp, a vacuum pump and a first gas storage bottle, the first gas storage bottle is used for storing high-pressure gas of types required by testing, one end of the upper clamp is detachably connected with a sample, and the other end of the upper clamp is detachably connected with a second gas storage bottle. The upper clamp is used for blocking a central channel of a sample and forming a first cavity body, the vacuum pump and the first gas storage bottle are respectively communicated with the first cavity body, and during use, the upper clamp can be detached from one end of the sample, and the sealed first cavity body is formed between the upper clamp and the central channel of the sample; the second cavity cools the sample to a required temperature, or the sample is heated to the required temperature through the induction heating coil, so that the temperature control during the test of the sample is realized, the test requirement is met, the test accuracy is improved, the test cost is reduced, and the test safety is guaranteed.

The invention relates to an experimental device and an experimental method for simulating CO2 storage in a coexistence space of a coal seam and a goaf of an abandoned mine, the device comprises a gas source module and a pressurization module, the pressurization module comprises an air compressor and a gas booster pump; the simulation module comprises a high-pressure gas buffer tank, a simulation coal seam module and a simulation goaf module, and the high-pressure gas buffer tank is connected with the gas booster pump; wherein the simulation coal seam module comprises a coal seam tank, the coal seam tank is coated with a heat insulation layer, a coal sample, a temperature sensor I and a pressure sensor I are arranged in the coal seam tank, a strain test part is arranged on the surface or in the coal sample, an inlet of the coal seam tank is connected with a gas booster pump, and an outlet is connected with the analysis module; the mined-out simulation module comprises a cavity tank, a temperature sensor II and a pressure sensor II are arranged in the cavity tank, an inlet of the cavity tank is connected with an outlet of the coal seam tank and the gas booster pump through valves, and the outlet of the cavity tank is connected with the analysis module.

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 relates to an integrated shunt excitation device. The integrated shunt excitation device specifically comprises an excitation fuse, a trigger module and a shunt module, the excitation fuse comprises an electronic ignition assembly, a piston and a conductive piece. The diverter module is connected in series in the conductive part to replace the part, needing to be disconnected, of the conductive part, the trigger module is connected with the diverter module and the electronic ignition assembly, and the trigger module starts the electronic ignition assembly according to a received current signal monitored by the diverter module when the current signal exceeds a set threshold value. The trigger module sends a trigger signal to the electronic ignition assembly to enable the electronic ignition assembly to act to release high-pressure gas to drive the piston to disconnect the diverter module and disconnect the main loop. According to the invention, the diverter replaces the to-be-disconnected part of the conductive member, so that the conductive member is relatively simple in structure, and the excitation device is smaller in size.

A gas supply system for a high-pressure gas consuming appliance and a low-pressure gas consuming appliance of a floating structure including a tank containing the gas is disclosed. The supply system includes: a first supply circuit and a second supply circuit; a gas return line; and a first heat exchanger and a second heat exchanger configured to carry out a heat exchange between the gas of the first supply circuit and the gas circulating in the return line. The first supply circuit includes an additional pump.

The invention discloses a compressed air energy storage system which comprises a compressor, a heat exchanger, an air storage mechanism and a turbine, and the compressor is used for absorbing air, compressing the air into high-pressure air and concentrating and heating moisture in the air; the heat exchanger comprises a shell, a gas flow channel and a water flow channel, the gas flow channel and the water flow channel are arranged in the shell in an isolated mode, a first gas inlet and a first gas outlet are formed in the two ends of the gas flow channel, and a first water inlet and a first water outlet are formed in the two ends of the water flow channel. The first water inlet is connected with the compressor, receives pressurized hot water and finally discharges the hot water through the first water outlet; the gas storage mechanism is connected with the first gas outlet and stores gas; in the energy release stage, the first gas inlet is disconnected with the compressor and connected to the turbine, the gas storage mechanism reversely releases gas, the heat exchanger releases heat energy and pressure potential energy stored in the energy storage stage to the gas, and the gas enters the turbine to expand and do work.

The invention discloses a microwave digestion tank with a rapid pressure reduction structure, and relates to the technical field of microwave digestion tanks. The microwave digestion tank with the rapid pressure reduction structure comprises a tank body and a tank cover, a mounting cavity is formed in the tank cover, a through hole is formed in the bottom of the mounting cavity, and an exhaust pipe is fixedly connected to the top of the through hole. According to the microwave digestion tank with the rapid pressure reduction structure, during rapid pressure reduction, when high-pressure gas in the sealing cavity is discharged through the through hole, gas-liquid separation, gas discharge and liquid return into the sealing cavity can be performed through the gas-liquid separation device, so that the liquid in the tank body is prevented from being taken out by gas flow, and the accuracy of a detection result is ensured.

The utility model belongs to the technical field of inflatable boats, and discloses a high-pressure rapid inflation system for an inflatable boat and the inflatable boat. The inflation system is applied to the inflatable boat, in the process of throwing the inflatable boat to the sea surface, the stop valve is triggered to open the first air supply pipeline, high-pressure air in the high-pressure air cylinder is released instantly, and the high-pressure air is conveyed to a boat body of the inflatable boat through the first air supply pipeline, a first air inlet connector of the diverter valve, an air outlet connector of the diverter valve and the inflation pipeline; the boat body of the inflatable boat can be quickly filled with air, so that the time is greatly shortened, and the rescue efficiency is improved; the inflatable boat basically floats on the sea surface after being launched, and the requirements for water tightness and air inlet design of the electric air supplementing pump part are low; the pressure transmitter monitors the gas pressure in real time, and when the pressure of the air chamber of the inflatable boat body is lower than a set value, the control unit triggers the electric air supplementing pump to start to supplement air to the air chamber of the boat body of the inflatable boat through the second air supply pipeline, the second air inlet connector of the diverter valve, the air outlet connector of the diverter valve and the inflation pipeline.

The invention discloses a heat treatment process of a gear, which relates to the technical field of automobile gear heat treatment, and comprises the following steps: S1, blanking, S2, forging, S3, normalizing: preheating the gear in a preheating furnace by adopting a heating mode of combining infrared radiation and hot air circulation, S4, rough machining, S5, carburizing and quenching: carburizing and quenching, s6, induction heat quenching: performing induction heat quenching on an induction coil; S7, nitriding treatment; S8, low-temperature tempering; S9, finish machining; normalizing is combined with infrared radiation, hot air circulation preheating and induction heating, the effects of reducing energy consumption and machining cost and improving production efficiency are achieved, the forging force is reduced through isothermal forging, the energy consumption of equipment is greatly reduced, pulse type vacuum carburizing, high-pressure gas quenching and induction heat quenching are adopted to introduce a self-adaptive induction heating technology, and the energy consumption of equipment is greatly reduced. And a plasma nitriding technology and a composite nitriding technology are adopted, so that the surface hardness, wear resistance and fatigue strength are improved.

The invention discloses an intelligent switch cabinet with automatic pressure relief protection, which comprises a cabinet body, a cabinet door is hinged to the front surface of the cabinet body, a heat dissipation channel is fixed on the back surface of the cabinet body, and a motor and a heat dissipation fan are respectively mounted in the heat dissipation channel; first pressure relief openings are formed in the upper portions of the left side and the right side of the cabinet body, blocking plates are arranged on the two sides of the cabinet body and located below the first pressure relief openings, and a second pressure relief opening is formed in the top of the cabinet body. According to the intelligent switch cabinet with the automatic pressure relief protection function, the first pressure relief opening and the second pressure relief opening can be gradually opened according to the pressure of the cabinet body, so that high-pressure gas is rapidly exhausted, graded pressure relief can be performed, pressure is released gently, pressure fluctuation is reduced, and the stability of a system is improved; and high-pressure gas can be discharged in the direction of the plugging plate in the inclined state, so that the gas is prevented from directly impacting surrounding personnel or equipment during pressure relief, and the safety risk is reduced.

The invention provides a device and method for replacing gas in a hollow-core optical fiber, and the device comprises a high-pressure gas chamber which is provided with at least one hollow-core optical fiber interface and at least one gas inlet / outlet, the hollow-core optical fiber interface is used for being connected with a gas path at one end of the hollow-core optical fiber, and the other end of the hollow-core optical fiber is sealed; the gas path is connected with the gas inlet and outlet; the vacuum pump is connected with the gas inlet and outlet through a gas path and is used for extracting residual gas in the hollow-core optical fiber; and the high-pressure gas source is connected with the gas inlet and outlet through a gas path and is used for filling high-pressure gas into the hollow-core optical fiber. Gas in the hollow-core optical fiber can be exhausted and replaced, the air pressure state in the hollow-core optical fiber is improved, and the signal transmission performance and the long-term use stability of the optical fiber are enhanced.

The invention relates to the field of high-voltage or large-current switches with arc extinguishing or arc preventing devices, in particular to a circuit breaker. An existing circuit breaker is improved, a brand-new solid-sealed polar pole is adopted, and high-pressure gas is compressed and generated in the opening and closing process of the solid-sealed polar pole by means of linear motion of a transmission rod in the opening and closing process of the solid-sealed polar pole and an air cylinder in transmission connection with the transmission rod; high-pressure gas is subjected to heat dissipation through the heat dissipation pipe section of the slow-release exhaust pipeline, and then low-temperature high-pressure gas is continuously blown into the heat dissipation gas cavity through the slow-release exhaust pipeline, so that heat exchange is carried out in the arc extinguish chamber in the heat dissipation gas cavity, high temperature generated in the opening and closing process of the arc extinguish chamber is taken away, and heat dissipation and cooling of the arc extinguish chamber are achieved. According to the novel solid-sealed polar pole, heat dissipation and cooling of the arc extinguish chamber are achieved by means of power provided by an operating mechanism in the opening and closing process, other cooling equipment does not need to be configured, the system structure is simplified, and energy consumption is reduced.

The invention relates to the technical field of air tightness detection, and particularly discloses an automobile axle housing welding seam air tightness detection method, which comprises the following steps of: firstly, performing high-efficiency preliminary air tightness screening on an axle housing by using an automatic pressure drop method so as to efficiently judge whether a workpiece leaks or not; based on the judgment result, a leakage signal is used as a triggering mechanism, a thermal imaging system is dynamically activated, and transient local low-temperature characteristics formed by the throttling effect of high-pressure gas at a leakage point are captured in a non-contact mode. Furthermore, the collected thermal imaging sequence is deeply analyzed, and the collected thermal imaging sequence and a digital three-dimensional model of a workpiece are subjected to spatial correlation mapping, so that a complete automatic process from macroscopic judgment of the leakage phenomenon to accurate positioning of three-dimensional space coordinates of a leakage source is finally formed. In this way, efficient automatic screening and accurate defect positioning capacity can be organically combined, and therefore the intelligent level and the closed-loop efficiency of the whole production quality control link are remarkably improved.

The invention discloses a low-resistance and easy-to-clean frame filter and a filtering method, and relates to the technical field of filtering equipment, the frame filter comprises a washing liquid storage tank, a gas-liquid mixing device, a rotary distribution head, a filter plate fixing device, filter cloth, a filter frame, a sieve plate, a washing pipe, a sieve plate supporting sleeve, a filtrate storage tank and a washing nozzle. According to the invention, a material flowing space is constructed between the sieve plates by using the sieve plate supporting sleeve, so that the filtrate flow of a traditional plate-and-frame filter is shortened, and the filtering resistance is obviously reduced; the gas-liquid mixing device is combined with high-pressure gas, so that the cleaning effect is effectively enhanced; after the filter plate fixing device is loosened, the filter cloth and the filter cake can be easily separated and fall off. According to the invention, a traditional plate frame type filter is transformed, so that the formed frame type filter can remarkably reduce the filtering pressure and energy consumption, greatly improve the filtering efficiency and the filter cake washing rate, reduce the maintenance cost and prolong the service life of equipment, and is suitable for various filtering scenes.