166 results about "Gas expansion" patented technology

The invention discloses a combustion chamber and turbine guider integrated composite flow channel outlet flow field uniformity evaluation method, and belongs to the technical field of gas turbine pneumatic design. The method comprises the steps that a geometric model of a combustion chamber and turbine guider integrated composite flow channel is built, a combustion chamber function section and a guider pneumatic section are fused through integral pneumatic modeling to form a continuous flow channel, a front section adopts a diffusion structure to form a low-speed combustion area, and a rear section adopts a gradually-shrinking channel to achieve gas accelerated expansion; performing three-dimensional cold-state flow field numerical simulation by adopting a structured grid division and delay separation vortex simulation technology; flow parameters including total pressure, Mach number, airflow angle and vorticity are extracted from the cross section of a flow channel outlet, conversion from a Cartesian coordinate system to a polar coordinate system is carried out, and a uniformly distributed aerodynamic parameter field is reconstructed by using an interpolation algorithm; the directional coupling degree is calculated based on the spatial correlation of the pressure gradient vector and the vorticity vector, and the vortex-pressure coupling entropy production index representing the overall aerodynamic loss of the flow channel is established in combination with the pressure pulsation intensity and the vorticity concentration ratio. According to the method, a three-dimensional evaluation system is constructed by integrating circumferential and radial non-uniformity and entropy production parameters, and accurate quantitative evaluation of flow characteristics and uniformity of the combustion chamber and turbine integrated structure is realized.

The invention relates to the technical field of soil and groundwater pollution remediation, in particular to a polluted groundwater source controlling and breaking system suitable for limited space of an industrial accumulation area, which comprises a main well, a gas stripping circulating unit and a groundwater circulating unit. A blocking device composed of a packing rubber structure and a driving device is arranged in the main well, the packing rubber structure is driven by the driving device to move and intermittently inject air to expand, and an air flow channel which is dynamically opened and closed is formed between the inner wall of the main well and the unsaturated area. The vacuum pump device builds negative pressure on the upper portion of the main well, so that purified clean gas enters an unsaturated area in an intermittent pulse mode through the peripheral injection well, and soil gas is induced to flow in an oscillating mode under cooperation of the dynamic gas flow channel. Groundwater extracted by the centrifugal pump is purified by the gas stripping area and the underground activated carbon filtering device and then is discharged into the top of the unsaturated area through the drainage device in an intermittent wave mode, the system is suitable for pollution treatment in the limited space of the industrial accumulation area, and targeted source control and long-acting reduction are achieved.

The subject matter of this specification can be embodied in, among other things, a subsea energy recovery system for generating electric power that includes an inlet flow line configured to couple to a subsea tree of a subsea gas well to receive gas produced from the subsea gas well, and a subsea electric power generation system, the subsea electric power generation system configured to reside subsea on a subsea production site of the subsea gas well and including a turbine wheel configured to rotate in response to expansion of the gas, a rotor configured to rotate with the turbine wheel, a stationary electric stator, the rotor and electric stator defining an electric generator configured to generate current, and a hermetically sealed housing enclosing the turbine wheel, the rotor, and the electric stator and hermetically sealed inline in the first flow line.

The invention belongs to the technical field of material forming and manufacturing, and discloses a hot gas expansion-explosion composite forming method for forming a complex deep-cavity thin-wall component. According to the hot air expansion-explosion composite forming method, a mold unit, an air pressure loading unit and an explosion unit are needed; the method comprises the following steps: mold preheating; feeding and die assembly are carried out; compressed air is filled, and pre-expansion is carried out; fuel is sprayed, and explosion forming is conducted; releasing pressure; and opening the mold and taking the part. The method has the advantages that hot gas bulging forming utilizes metal high-temperature plasticity and evenly-distributed flexible air pressure loading, and the plate forming performance is improved; explosive forming has a very high deformation rate, high plastic deformation can be achieved within a very short time, and the forming performance of the plate can be further improved through the combined action of the strain rate effect and the inertia force. According to the method, the plastic deformation capacity of the material can be remarkably improved by combining the two, and forming of the complex deep-cavity thin-wall component is facilitated.

The invention provides a hollow pipe fitting forming device and method. The hollow pipe fitting forming device comprises a heating mechanism, a bulging quenching mold and an air source mechanism. The heating mechanism comprises a roller hearth furnace provided with a conveying roller way, a furnace body is sequentially provided with a feeding isolation chamber, a heating chamber and a discharging isolation chamber in the length direction, all the chambers are isolated from one another and communicated with a protective atmosphere system, and the chambers are used for introducing dry air or inert gas into the furnace body and maintaining the dew point temperature below-15 DEG C; hydrogen adsorption on the surface of the hollow pipe blank is effectively inhibited, and the hydrogen embrittlement risk is reduced. After a pipe blank is heated at a high temperature, austenitizing of a material structure is achieved, then the pipe blank is rapidly transferred to a bulging quenching die, gas expansion deformation occurs in a die cavity under the action of set air pressure, the hollow pipe fitting is formed by attaching the die wall, meanwhile, the hollow pipe fitting attached to the die cavity is synchronously cooled through a cooling assembly in the die, and quenching treatment is achieved. The material structure is converted into martensite, and the mechanical property of a formed part is improved.

The application discloses a kind of mixed nitrate class molten salt preparation device, it is related to molten salt preparation technical field, including jar body, the jar body is rotatably connected with rotating pipe, rotating pipe is fixedly connected with two fixed rods, further include: mixing mechanism.The application is expanded by the setting of scraping unit, inert gas in gas storage tank is expanded under the action of high temperature, gas expansion drives by rotating pipe into two installation cylinder, and drives two first sliding piston rod to move outward, first sliding piston rod moves and drives fixed frame to move, fixed frame moves and drives movable pipe and scraper to move, so that scraper is contacted with jar body inner wall, and the inner wall of jar body is scraped, movable pipe moves and drives rotating ring to rotate by connecting block, connecting rod and fixed block, rotating ring rotates and drives two baffle one to rotate, so that the area of two feed ports is increased, and then the feeding amount is increased, thereby adaptively increase the turnover amount, improve the uniform heating effect of material.

The utility model discloses a convenient connecting device for a gas meter and a gas pipeline, which belongs to the technical field of gas engineering and comprises a connecting pipe, the gas meter, the gas pipeline and a connecting sleeve, a fixing ring is fixedly connected to the center of the connecting pipe, and a group of first threaded holes distributed in an annular array are formed in each of the left end and the right end of the connecting pipe. A set of second threaded holes distributed in an annular array are formed in the connecting sleeve, matched positioning pins are jointly installed in the first threaded holes and the second threaded holes, an annular groove is formed in the connecting sleeve, an outer sealing ring is fixedly connected in the annular groove, and double sealing is achieved through a first elastic sealing ring and a second elastic sealing ring. The first elastic sealing ring conducts internal sealing on the connecting position through the elastic force of the compression spring, the second elastic sealing ring conducts external sealing through gas expansion of the annular elastic gas bag, the double-sealing design greatly improves the connecting sealing performance, and the gas leakage risk is effectively avoided; and safe and stable operation of the gas supply system is ensured.

The utility model discloses a waste discharge adhesive tape winding mechanism and a GDL cutting forming device. The waste discharge adhesive tape winding mechanism comprises a fixing frame, a winding assembly and a broken tape detection assembly. The winding assembly comprises an air swelling shaft, a winding torque motor and a plurality of winding units, the winding torque motor is hung below the fixing frame, one end of the air swelling shaft is connected with the winding torque motor, and the air swelling shaft is sleeved with the winding units; the winding unit comprises an assembly inner ring, an assembly outer ring, a friction plate and a plurality of adjusting screws, the assembly inner ring is sleeved and fixed on the air expansion shaft, the assembly outer ring is sleeved on the assembly inner ring, a ball bearing is arranged between the assembly outer ring and the assembly inner ring, the friction plate is sleeved on the air expansion shaft, and the adjusting screws are arranged on the air expansion shaft. The friction plate is arranged in the assembling inner ring and attached to one side of the assembling inner ring and one side of the assembling outer ring, and the adjusting screw penetrates through the friction plate and is embedded into the assembling inner ring. According to the utility model, the winding efficiency of the waste discharge adhesive tape is effectively improved.

The application discloses a kind of continuous self-bleeding self-suction pumps, it is related to self-suction pump technical field, including main body, the upper portion of the main body is provided with self-suction tank, the top of the main body is equipped with steam jacket heat tracing, the upper end of steam jacket heat tracing is equipped with injection device, the lower end of self-suction tank is provided with sealing device, the middle of sealing device is equipped with pipeline, the bottom of pipeline is equipped with fixing device, the right end of fixing device is provided with ground tank, the upper end of ground tank is equipped with nitrogen pressure exhaust pipeline device.The application is fixed on the upper end of steam jacket heat tracing by outer frame, then connects steam pipe line by the pipe joint of right end, exhausts gas in ground tank to expansion pipe, carries out gas expansion, exhausts the gas after completion of expansion to mixing chamber, makes it mixed jet pump, then is discharged by nozzle, without manual filling pump.Again by the pipeline cavity of through frame inner cavity through connecting pipeline.

The invention discloses a green pressure relief method for mine pressure display caused by multi-coal-seam mining remaining coal pillars, and belongs to the technical field of multi-coal-seam mining. According to the invention, through an intelligent decision-making system of multi-source data fusion, the problem of response lag of a traditional method is solved; a coupling technology of supercritical CO2 gas expansion pressure relief and a biodegradation hydraulic fracturing technology is adopted, low pollution and coal pillar structure protection in the pressure relief process are achieved, through a whole-process closed loop of'monitoring-prediction-decision-verification ', the problem of multi-coal-seam stress superposition control is solved, and the stability of the pressure relief process is improved. The method is especially suitable for a complex geological environment with mine pressure appearing caused by multi-coal-seam superposition mining.

The invention provides a high-pressure gas membrane rupture pressure measuring device and a measuring method thereof, and belongs to the technical field of pressure measurement. The measuring device comprises a pressure generation system, a gas compression system, a gas injection system, a pressure measuring system and a diaphragm clamping system. The piston divides the cavity into a hydraulic cavity and a gas compression cavity, and the piston is hydraulically driven to compress the pre-filled gas, so that the diaphragm is broken. The pressure measurement system records pressure-time data in real time, and a sliding window average algorithm is adopted to extract a membrane rupture pressure peak value. According to the technical scheme, inert gas is used, initiating explosive devices are not used, membrane rupture energy is only gas expansion, the protection box can absorb fragments, and explosion-proof transformation is not needed in a laboratory. And the smoothed unique membrane rupture pressure value is output through a sliding window averaging algorithm, and manual reading errors are eliminated. According to the technical scheme, the device is compact in structure, safe to operate, rapid in testing and suitable for accurately measuring the diaphragm rupture pressure of the gas gun diaphragm in a conventional laboratory.

A combined heat and power (CHP) system and a method of operating is provided. The CHP system includes an oxygen-air separation device. A combustion chamber has an inlet coupled to the oxygen-air separation device. The combustion chamber receives an expanded heated CO2 working gas for combustion of solid fuel and generates a CO2 exhaust gas. The expanded heated CO2 working gas comprising at least a portion of the CO2 exhaust gas. A heat exchanger receives combustion gases and outputs a cooled CO2 working gas. A turbine is provided having a compression section and an expansion section, the compression section configured to receive and compress the cooled CO2 working gas and to direct it to the heat exchanger. The turbine receives a heated CO2 working gas at the expansion section and expands the heated CO2 working gas. In an embodiment, CO2 products may be generated from the system.

The invention relates to a small-load pneumatic ejection separation test platform and a speed projection engineering estimation method. The test platform is composed of an air compressor, a high-pressure gas cylinder, an electromagnetic valve, a pressure gauge, a mounting rack, an ejection cylinder, a piston, a high-speed camera, a grid background plate, an irradiation lamp, a protection pad and other components. The air compressor is used for providing high-pressure gas required by the ejection system; the high-pressure gas cylinder is used for storing high-pressure gas required by system ejection; the electromagnetic valve is used for controlling the ejection device to start; the pressure gauge is used for measuring gas pressure in the gas cylinder; the ejection cylinder is used for providing a space required by high-pressure gas expansion and a track required by object ejection; the piston is used for converting aerodynamic force into thrust to provide acceleration for a separated object; the grid background plate is used for determining the position of the isolate shadow; and the irradiation lamp is used for irradiating the separated object and projecting a shadow on the square background plate. The device has the advantages of being safe in experiment, easy to install, convenient to recycle, convenient to maintain and capable of repeating the experiment.

The utility model discloses a kind of anti-permeation moisture-proof structures of building wall, comprising: wall, the outside of the wall is fixedly connected with adhesive layer, the outside of the adhesive layer is fixedly connected with moisture-proof layer, the outside of the moisture-proof layer is fixedly connected with waterproof finish layer;Drying assembly.The utility model, when daily use, moisture-proof layer can absorb the moisture of wall outside, ensure that wall outside always keeps dry state so that moisture is absorbed by moisture-proof layer, in sunny day, heat of illumination can be absorbed by heat-absorbing plate, finally heat is transferred to radiating wire by heat-conducting plate, finally radiating wire radiates heat to make moisture in moisture-proof layer evaporate dry, when moisture in moisture-proof layer evaporates and gasifies expansion, gas will flow out from air hole, gas expansion will pressurize plugging plate in process, synchronously make that slide pole and plugging plate extend outward, so that gas passes through air plate and discharges, further improve the effect of moisture-proof.

The present invention relates to the field of refrigeration, and in particular to a wheel cover assembly, an expander, and an air cycle machine. The wheel cover assembly comprises a housing, the housing being provided with an air inlet and an air outlet; a wheel cover, a gas flow channel surrounding the wheel cover being formed between the outer wall surface of the wheel cover and the inner wall surface of the housing, the gas flow channel being connected to both the air inlet and the air outlet, the air inlet being used to introduce gas; when gas is introduced through the air inlet, the gas flows along the gas flow channel, exchanges heat with the wheel cover, and is discharged through the air outlet; when the temperature of the gas filled in the gas flow channel is higher than the temperature of the impeller, the wheel cover can radiate the heat of the absorbed gas to the impeller to prevent the impeller of the expander from being frozen by the low-temperature gas after the gas expands and performs work.

The utility model relates to the technical field of spraying, and particularly discloses a stainless steel groove type pipe fitting surface spraying device, which comprises an operating table, a cylinder arranged on the operating table, a gas expansion shaft coaxially fixed with an output shaft of the cylinder and used for fixing a pipe fitting, an air pump arranged on the operating table and connected with the gas expansion shaft, a spraying box arranged on the operating table above the cylinder and having an opening downward, and a spraying assembly arranged in the spraying box and used for spraying the pipe fitting, wherein the bottom of the spraying box is symmetrically provided with a collecting assembly used for collecting paint spraying residues, thereby solving the problem that the existing paint spraying device can accumulate paint spraying residues on the operating table, the paint spraying residues float in the air and release volatile organic compounds at the same time, the air in the working environment is polluted, and the health of the operator is damaged.

In the patent application document I have described a coordination mechanism of two pistons within a cylinder that allows a thermodynamic process such as expansion to be carried out. The pistons are moved by separate mechanisms that transform the continuous rotation of motor or generator shafts into irregular rectilinear motion. The objective of this invention is its use in power production facilities where efficient compression or expansion of gas or vapors is required. The applications can be: Expansion of steam produced in a biomass boiler. Expansion of steam produced with some energy source, primarily renewable. Compression and expansion of air in an external biomass combustion plant and compressed air-exhaust gas heat exchanger. Vapor-gas expansion produced by the combustion of ethanol and oxygen.

The utility model discloses an inflatable shaft structure, which relates to the technical field of inflatable shafts and comprises an inflatable shaft, the inflatable shaft comprises an air inlet shaft provided with a through hole and an inflatable shaft body connected with the air inlet shaft, and a sliding plug capable of moving along the length direction of the inflatable shaft is arranged in the inflatable shaft body. The surface of the sliding plug comprises a plurality of conical bodies which are connected with one another, a plurality of conical planes are distributed on the surface of each conical body, the conical planes of the sliding plug abut against a plurality of expansion strips, and a plurality of inclined planes matched with the conical planes are arranged on the expansion strips. The expansion strip is a whole block and is composed of a plurality of inclined plane sections, the conical plane is machined on the sliding plug to be matched with the expansion strip in a sliding mode, the expansion strip directly moves on the conical plane of the sliding plug, only the planes of the two pieces make contact with each other, restraining force and resistance in other directions do not exist, and the expansion strip is smoother in the working process; in a working environment including material dust, the expansion strip and the sliding plug of the structure cannot be blocked.

The disclosure provides a hybrid energy storage system, wherein the Brayton cycle unit comprises a first compressor, a first air-salt heat exchanger and an air-air heat exchanger forming a circulation loop, the cold side of the first air-salt heat exchanger is provided with a first inlet and a first outlet, the cold side of the air-air heat exchanger is provided with a second inlet and a second outlet, and the second inlet is used for air entering; the energy storage unit comprises a molten salt heat storage unit, the molten salt heat storage unit is connected with the first inlet and the first outlet to form a circulation loop; a Rankine cycle unit is connected with the molten salt heat storage unit to generate power by obtaining heat; and the processing unit comprises a first unit, the first unit comprises a compression section and an expansion section connected with the compression section, the compression section is connected with the second outlet, has a gas compression function, and is connected with the molten salt heat storage unit to deliver first temperature heat to the molten salt heat storage unit and second temperature compressed air smaller than the first temperature to the expansion section, and the expansion section has a gas expansion function to generate power.

The utility model discloses a kind of pneumatic eccentric roller device and contain the winding press roller device of the pneumatic eccentric roller device, including gas expansion shaft, the outside of the gas expansion shaft, a plurality of eccentric roller units are sequentially sleeved, the eccentric roller unit includes eccentric shaft, bearing and rubber roller, rubber roller can rotate relative to eccentric shaft;The middle of the eccentric shaft is equipped with a long circular through-hole, the gas expansion shaft is arranged in long circular through-hole, a gasbag is fixed on gas expansion shaft, the outside of gasbag is equipped with the key strip corresponding with the number of eccentric roller unit, after gasbag is ventilated, key strip can move eccentric roller unit whole to the side of gas expansion shaft;The both ends of the gas expansion shaft are fixedly provided with a check ring;Between adjacent two eccentric roller units and between eccentric roller unit and check ring, are slidably separated by stop block. In the utility model, each eccentric roller unit can independently adaptively compress and support the surface of winding roller when encountering the surface of winding roller with different height.

The beverage combination all-in-one machine with the purification function comprises a beverage machine body, a water tank, a hot container and a cold container are arranged in the beverage machine body, a hot container exhaust pipe is arranged on the hot container and connected with the top of the water tank, a cold container exhaust pipe is arranged on the cold container and connected with the top of the water tank, the hot container exhaust pipe is located on one side of the water tank, and the cold container exhaust pipe is located on the other side of the water tank. The cold container exhaust pipe is located on the other side of the water tank, a pair of baffle assemblies are symmetrically arranged on the top wall of the water tank and comprise upper baffles arranged on the top wall of the water tank, the bottoms of the upper baffles are connected with lower baffles through transverse rods, and an overflow pipe is arranged on the side, close to the cold container exhaust pipe, of the water tank. The water surface in the water tank is used for cooling hot steam, so that the air pressure in the water tank is prevented from being too high, interface loosening or deformation caused by gas expansion in the water tank is avoided, meanwhile, dust and bacteria adsorption caused by condensed water formed by introducing a cold liner exhaust pipe into the water tank is avoided, and excessive hot steam generated by the hot liner is discharged into a buffer tank or the water tank.

A resource supply system, comprising: a floating platform (900) arranged at a water surface; a gas compression device (100) arranged on the floating platform (900) and provided with, communicated with each other, a first gas inlet (110) and a first gas outlet (120; a gas expansion device (200) arranged on the floating platform (900) and used for electrically connecting to a power supply device, the gas expansion device (200) being provided with, communicated with each other, a second gas inlet (210) and a second gas outlet (220), and the second gas outlet (220) being used for discharging gas; a first heat exchange device (300) arranged on the floating platform (900) and provided with, communicated with each other, a first inlet (311) and a first outlet (312), the first inlet (311) being communicated with the first gas outlet (120), and the first outlet (312) being communicated with the second gas inlet (210); and a seawater distillation device (400), the seawater distillation device (400) being able to make a heat exchange with the first heat exchange device (300) and used for communicating with a water supply device.

The utility model discloses a heating tube sealing structure and baking tray, aim at solving the existing heating tube seal not thoroughly, the assembly stability is poor and so on. The structure contains heating disc, its inside is equipped with magnesium oxide filler, and the first, second heating tube cold needle is projected with respectively two ends, and there is the heating wire that penetrates heating disc and is wrapped by magnesium oxide filler between two cold needles. In addition, still be equipped with first conducting rod subassembly and second conducting rod subassembly, two respectively with the both ends sealed connection of heating disc. This design through both ends conducting rod subassembly and the close seal of heating disc, can bear the gas expansion pressure in pipe, prevent gas leakage, maintain the pressure balance in pipe, enhance the sealing reliability, effectively solve the sealing problem caused by gas expansion. Meanwhile, the structure reduces the dependence on the size precision of single component, even if the size error exists in component processing, can realize good sealing connection, reduces the unstable situation of assembly caused by size deviation, improves the stability and success rate of assembly.

The utility model belongs to the technical field of pipe thermal expansion processing, and particularly relates to pipe blank positioning equipment for pipe thermal expansion processing, which comprises a lower die, a lower cavity is arranged on the lower die, mounting blocks are symmetrically arranged on the lower die, the mounting blocks are arranged at two ends of the lower cavity, end positioning mechanisms and sealing mechanisms are arranged on the mounting blocks, and the sealing mechanisms are arranged on the end positioning mechanisms. The sealing mechanism comprises a sealing head and a sealing driving device, the sealing driving device is in transmission connection with the sealing head, the sealing driving device drives the sealing head to move towards or away from the lower cavity, the end positioning mechanism is used for positioning the end face of a pipe blank, and the sealing head is communicated with air supply equipment. According to the utility model, the problems of position deviation, shifting and inaccurate direction of a hot air expansion pipe blank when the hot air expansion pipe blank is put into a mold cavity can be solved, and the problem of leakage of high-pressure sealing during hot air expansion forming is solved.

The present invention relates to a device and a method for producing liquids from flue gas with low energy consumption, as well as their use. This device consists of a CO2 and N2 low-temperature medium-pressure adsorption system, an energy recovery system, a low-temperature filter gas compression system, a low-temperature CO2 purification system, and a liquid nitrogen device, which are connected to one another by piping and valves. The CO2 and N2 low-temperature medium-pressure adsorption system comprises a flue gas cooler, a first gas-liquid separator, a compression system, a drying system, a gas expansion system, and a low-temperature medium-pressure adsorption device. The energy recovery system comprises an electric heater and CO2 compressor, a heat recovery device, and a cooler. The low-temperature filter gas compression system comprises a low-temperature compressor.In the low-temperature CO2 purification system, liquid CO2 is produced, and the liquid nitrogen device ensures the rectification and liquefaction of the medium-pressure gas from the low-temperature compression system to obtain liquid nitrogen products. The invention is characterized by a simple structure, good adsorption efficiency, operational flexibility, and low energy consumption.

The supercritical expander includes an outer casing and a rotor housed within the outer casing so as to rotate around a rotation axis. At least one combustor is housed within or associated with the casing. The outer casing includes a high-pressure casing and a low-pressure exhaust casing coupled to each other by flange connections along a plane perpendicular to the rotation axis. The low-pressure exhaust casing includes an exhaust plenum adapted to collect combustion gases expanded through a gas expansion passage. The low-pressure exhaust casing includes at least one exhaust aperture, wherein the expander comprises an outer casing and a rotor housed within the outer casing so as to rotate around a rotation axis.

The invention discloses a novel liquid oxygen safe and environment-friendly gas expansion fracturing method. The method comprises the steps of liquid oxygen storage, conveying, preheating, expansion acting and tail gas treatment. Liquid oxygen is stored in a low-temperature-resistant pressure container with a pressure monitoring and temperature control system, is conveyed to a preheating cavity through a pipeline with a spiral flow guide structure for segmented heating, then is guided into a variable cross-section expansion chamber to realize instantaneous gasification expansion through pulse energy input, and finally is discharged after being treated by a catalytic reaction device. According to the method, the safety is improved by adopting a composite heat preservation structure, a PID temperature control algorithm and a pressure linkage cut-off mechanism; energy efficiency is improved through segmented heating, variable cross-section design and pulse energy input; the platinum-rhodium alloy catalyst is used for treating tail gas to enhance the environmental protection property, unification of safety, high efficiency and environmental protection in the liquid oxygen gas expansion process is achieved, and the method is suitable for the fields of industrial power and the like.

The utility model relates to a kind of bush type air expansion shaft, comprising: always fill air expansion shaft;Bushing expansion piece is set in the large diameter end of the always fill air expansion shaft, and its outer ring is polygonal structure;And reel is set in the outside of the bushing expansion piece and is lifted inner wall by the edge of the polygonal structure when the bushing expansion piece tightens.Compared with prior art, the utility model has the advantages of preventing reel slip, improving winding stability, improving product yield, etc.

The invention relates to the technical field of coal production, and discloses a coal rock tensile strength fracturing probe device which comprises an air expansion pipe, a seamless steel pipe is sleeved with the air expansion pipe, one side of the seamless steel pipe is fixedly connected with an oil pipe, the oil pipe is sleeved with a sleeve located on the inner side of the air expansion pipe, and a plurality of grooves are formed in the outer wall of the air expansion pipe at equal intervals in the axial direction. A plurality of thin metal strips are adhered to the outer surface of the inflatable tube along the axial direction, a pressure relief tube is sleeved outside the inflatable tube, the pressure relief tube is formed by combining a supporting tube and conical tubes, the conical tubes are fixedly connected to two sides of the supporting tube, and a plurality of through holes are formed in the outer side of each conical tube. The technical means that the seamless steel pipe, the oil pipe, the casing pipe, the gas expansion pipe and the pressure relief pipe are matched is adopted, and the defects that in the prior art, fracturing pressure distribution is uneven, coal rock fracture development is uncontrollable, and device recycling is difficult are overcome; and therefore, the technical effects that coal rock tensile strength is accurately fractured, the fracture form can be observed, the repeated utilization rate of the device is high, and the operation safety is high are achieved.

The present application belongs to the field of oil and gas exploration, and particularly relates to a device and method for determining gas-measured porosity under overburden pressure. The device for determining gas-measured porosity under overburden pressure comprises: a core holder for accommodating a rock sample, a pressure boosting device connected to the core holder to apply overburden pressure to the rock sample, a space-adjustable gas chamber with an internal space volume capable of being adjusted, the space-adjustable gas chamber being connected to the core holder, and a gas measurement system connected to the core holder and the space-adjustable gas chamber to pass in gas with a preset pressure, thereby measuring the porosity of the rock sample. In the present application, during the calibration of the pore volume, the continuous change of the internal space of the space-adjustable gas chamber is used to obtain a pore volume-pressure standard curve with multiple measuring points through a single gas expansion process, thereby avoiding the purpose of calibrating the pore volume by repeatedly loading and unloading the sample in the core holder, and greatly simplifying the steps of calibrating the pore volume.