85 results about "Cryopump" patented technology

The invention discloses a multi-stage isolation high vacuum obtaining system of a neutral beam injection device and a control method, and relates to the field of nuclear fusion Tokamak vacuum pumping design. The low-temperature pump unit comprises a plug-in low-temperature pump in a neutral beam vacuum chamber, and the plug-in low-temperature pump is used for refrigerating and cooling liquid nitrogen and liquid helium to adsorb gas to realize vacuum pumping; the low-temperature pump preceding-stage air extractor unit comprises a molecular pump unit, a roots pump unit and a mechanical pump unit; an inlet of the molecular pump set is connected with the neutral beam vacuum chamber through a gate valve, and an outlet of the molecular pump set is connected with an inlet of the roots pump set through a forestage valve. An inlet of the roots pump set is connected with the neutral beam vacuum chamber through a preceding stage valve and a pre-pumping valve, and an outlet of the roots pump set is connected with the mechanical pump set through the preceding stage valve. By adopting a multi-stage vacuum shielding technology and a step-by-step start-stop strategy, step-by-step transition from low vacuum to high vacuum and from high vacuum to low vacuum can be efficiently, stably and reliably realized, and an air extractor unit and a vacuum environment are protected from being polluted.

The invention discloses a testing method and device of a low-temperature pump, electronic equipment and a storage medium, and relates to the technical field of vacuum technology and vacuum pump performance tests.The testing method of the low-temperature pump comprises the steps that the first pressure of a first inflation chamber is obtained, and an air distribution mode is determined based on the first pressure; after gas distribution is completed based on the gas distribution mode, an impact test is started to introduce gas into the cryogenic pump; and acquiring temperature test data of the cryogenic pump, and determining the validity of the current test based on the temperature test data. According to the testing method of the low-temperature pump, the gas distribution process is more accurate through multiple gas distribution modes, the validity of the test data is judged through the temperature test data of the impact test, and the transition capacity parameter of the low-temperature pump is subjected to process inspection depending on experience; the method is converted into a standardized metering process which is high in reliability, high in efficiency and reproducible.

This invention discloses a testing method, apparatus, electronic device, and storage medium for cryogenic pumps, relating to the technical fields of vacuum technology and vacuum pump performance testing. The testing method includes: acquiring a first pressure in a first filling chamber and determining a gas distribution mode based on the first pressure; after completing gas distribution based on the gas distribution mode, initiating an impact test to introduce gas into the cryogenic pump; acquiring temperature test data of the cryogenic pump and determining the validity of the current test based on the temperature test data. This invention's cryogenic pump testing method makes the gas distribution process more precise through multiple gas distribution modes, and determines the validity of the test data through the temperature test data from the impact test. This transforms the cryogenic pump's pass-through capacity parameter from an experience-dependent process check into a highly reliable, efficient, and reproducible standardized measurement process.

The present application belongs to the technical field of coal seam permeability improvement in underground coal mine drilling, and provides a coal seam permeability improvement device and method for low-permeability coal seam in underground coal mine by temperature-variable jet flow, which comprises a jet flow nozzle installed at the outlet of a high-pressure water pipe, the inlet of the high-pressure water pipe being connected with a high-pressure water pump, and the high-pressure water pump being connected with a rapid heater; the jet flow nozzle is further connected with a liquid nitrogen generator through a vacuum heat insulation pipe, the inlet end of the liquid nitrogen generator being connected with a nitrogen generator, the outlet end being connected with the inlet end of a liquid nitrogen storage tank, the outlet of the liquid nitrogen storage tank being connected with a liquid nitrogen tank group, the outlet end of the liquid nitrogen tank group being connected with a cryogenic pump, and the outlet of the cryogenic pump being connected with the jet flow nozzle through a vacuum heat insulation pipe; the device effectively increases the fissure size of the drilling, improves the coal seam permeability, and increases the gas production. Meanwhile, a liquid nitrogen production device is used to directly produce liquid nitrogen, which is low in cost and can be reused. The method is simple and easy to operate, can effectively solve the loss of liquid nitrogen in the transportation process, improve the effect of liquid nitrogen on the coal body, and improve the coal seam permeability improvement effect.

The nitrogen purging device for the low-temperature pump comprises a supporting table, the supporting table is used for containing the low-temperature pump, a nitrogen supply device is arranged on the supporting table, the nitrogen supply device is connected with a gas pipe, the gas pipe is connected with a nitrogen purging ring, and the nitrogen purging ring is movably arranged at the mechanical seal part of the driving end of the low-temperature pump in a sleeving mode. The nitrogen purging ring is used for blowing nitrogen to the driving end mechanical seal part of the low-temperature pump, the supporting table is further provided with a swing mechanism, the swing mechanism is used for driving the nitrogen purging ring to rotate back and forth at the corresponding amplitude, and the low-temperature pump has the advantages that the purging sufficiency of the whole mechanical seal part of the low-temperature pump can be improved, and the freezing risk of the mechanical seal part of the low-temperature pump is reduced.

The invention relates to a piston pump (1) for liquefied gases, such as hydrogen, comprising a degassing gas separation device (4) arranged between the suction chamber (2) and the degassing chamber (3), the separation device (4) comprising a main body (40) comprising at least one through-passage (41) connecting the suction chamber (2) and the degassing chamber (3), and a closing means (42) for closing the passage, the closing means (42) being configured to: - in a closed position (P0), close the passage when the degassing pressure is higher than the suction pressure; - in an open position (P1), open the through-passage (41) when the degassing pressure is lower than or equal to the suction pressure.

The utility model discloses a universal adjustable safe vaporization device for liquefied bulk gas, which belongs to the technical field of vaporization devices and comprises a liquid nitrogen storage tank, one end of the liquid nitrogen storage tank is fixedly connected with a first gas source switch device, and the other end of the liquid nitrogen storage tank is fixedly connected with a second gas source switch device. The end, away from the liquid nitrogen storage tank, of the first gas source switch device is fixedly connected with a second gas source switch device and a vaporizer pipeline, and the face, away from the first gas source switch device, of the vaporizer pipeline is fixedly connected with a detection pipeline used for main pipeline detection. The face, away from the first gas source switch device, of the second gas source switch device is fixedly connected with two sets of temperature safety control devices. The problems that in the process that liquefied gas is conveyed to the vaporizer through a low-temperature pump and the like, the speed and the temperature need to be strictly controlled to prevent overload of the vaporizer, and meanwhile the pressure and the temperature of output gas behind the vaporizer can cause a large amount of influences on used equipment are solved.

The utility model discloses a pressurized gasification verification pry, and relates to the technical field of hydrogen-oxygen pressurization. The liquid material storage bottle, the low-temperature pump, the air temperature type vaporizer, the water bath type vaporizer and the gaseous material storage tank are mounted on the base and are sequentially communicated through a conveying pipeline; the flame arrester is assembled at the tail end of the blow-down pipe, and the front end of the blow-down pipe is connected to a gas return port of the low-temperature pump, a conveying pipeline at the front end of the blow-down pipe, a conveying pipeline at the rear end of the water bath type vaporizer and a gaseous material storage tank; and the detection mechanism is used for detecting the pressure before and after pressurization of the low-temperature pump, the temperature before and after heating of the air temperature type vaporizer and the water bath type vaporizer and the pressure and temperature of the gaseous material storage tank. A detection mechanism is arranged to detect the pressure before and after pressurization of a low-temperature pump, the temperature before and after heating of a gasifier and the temperature and pressure in a gaseous material storage tank in the hydrogen-oxygen supply system so as to verify the principle of the high-pressure hydrogen / oxygen supply system.

The application discloses a low-temperature pump with adjustable gas pumping speed, which comprises a pump body assembly, a control assembly and a field generator. The pump body assembly is provided with a pump cavity with a pumping opening. The control assembly is arranged in the pump cavity and comprises a field induction part and a throttling part connected to the field induction part, and the field induction part is connected to the pump body assembly. The field generator is arranged in the pump body assembly and used for emitting a control field to the field induction part. The control field can make the field induction part change shape, and the change of the shape of the field induction part can make the throttling part change position relative to the pump body assembly, so that the fluid flow rate flowing into the pump cavity can be changed. The low-temperature pump can change the fluid flow rate of the pump cavity through the field generator and the field induction part, and has a simple structure.

A system and method for high rate liquid hydrogen tank filling with minimal vapor losses is provided. The flexible, pump-based filling system can achieve high fill rate of liquid hydrogen in excess of 100 kg per minute and accommodate maximum delivery pressures. The present system and method further includes recovery and re- liquefaction of displaced and flash generated tank vapors. The liquid cryogen filling system comprises a holding tank 20 configured to store liquid cryogen; two or more cryogenic pumps 22, 24 disposed in series arrangement downstream of the holding tank, the two or more cryogenic pumps configured to pressurize a stream of liquid cryogen from the holding tank to form a pressurized liquid cryogen stream; a heat exchanger 25 configured to warm the stream of liquid cryogen via indirect heat exchange against a recycled gaseous cryogen stream to yield a liquid cryogen recycle stream; a target tank 30 disposed downstream of the heat exchanger and configured to receive the warmed, pressurized liquid cryogen stream; a recycle circuit 35 comprising a first conduit 36 configured to direct a saturated vapor cryogen stream from a headspace or overhead of the target tank to the heat exchanger as the recycled gaseous cryogen stream and a second conduit 38 configured to receive the liquid cryogen recycle stream from the heat exchanger; one or more valves 40 disposed in the recycle circuit downstream of the heat exchanger; and a recovery tank 45 disposed downstream of the one or more valves and configured to receive the liquid cryogen recycle stream; wherein a liquid cryogen stream from the recovery tank is recycled.

To provide a cold storage material having excellent specific heat characteristics.SOLUTION: A cold storage material of an embodiment includes: a SmNiGe3-type crystal phase; and holmium (Ho), erbium (Er), nickel (Ni), and silicon (Si) and / or germanium (Ge).SELECTED DRAWING: Figure 1

A cryopump assembly, including a centrifugal pump and an induction motor, specially configured for delivery of liquid hydrogen (LH2) from a cryogenic LH2 tank to various application scenarios, has a horizontal configuration and includes an offset discharge port to prevent the occurrence of gas blockage phenomena. A one-piece vacuum jacket housing may be employed to enclose various portions of the centrifugal pump and the induction motor to prevent heat loss, while another embodiment is to lubricate the bearings and cool the induction motor with LH2 flow through the induction motor. The centrifugal pump can be of a single-stage type or a multi-stage type, and each stage unit comprises an impeller and a guide vane connected with a guide vane shell. The pump shares one motor / pump shaft with the motor. Another embodiment is that the cryopump assembly is vertically submerged in a cryogenic LH2 tank, or vertically submerged in a sump vessel secured to the exterior or interior of the cryogenic LH2 tank.

Adapt the cryopump to the radiation environment. [Solution] The cryopump 10 comprises a cold head motor 16a, an inverter 32b located remotely from the cold head motor 16a and configured to output a PWM voltage capable of driving the cold head motor 16a at a determined operating frequency, and at least one converter 34 connected between the inverter 32b and the cold head motor 16a. The converter 34 is configured to receive a PWM voltage from the inverter 32b, convert the PWM voltage into a cold head motor drive voltage that drives the cold head motor 16a at a determined operating frequency, and output the cold head motor drive voltage to the cold head motor 16a. The cold head motor drive voltage has a waveform with reduced high-frequency components compared to the PWM voltage.

The application discloses a low-temperature liquid rocket engine immersion precooling system and method, and belongs to the technical field of liquid rocket engine precooling, which comprises a low-temperature propellant tank, a conveying pipeline, a low-temperature pump, a post-pump pipeline and low-temperature valves; the application only utilizes necessary heat exchange components of the engine to realize immersion precooling, and does not need to set a discharge valve, a discharge pipeline, a reflux pipeline and a reflux valve, so that the system structure is greatly simplified; the precooling process does not need propellant discharge, effectively reduces the propellant consumption, and improves the rocket carrying capacity; in combination with an overall layout of an inclined downward direction, a guide inner wall and an inclined upward design of the post-pump pipeline, a continuous exhaust passage is constructed, gas is ensured to smoothly float up, and the precooling efficiency is greatly improved; by limiting the relative relationship between the inclination degrees of the guide inner wall and the post-pump pipeline, the gas floating rate can be flexibly optimized according to different working conditions, the best balance between the exhaust efficiency and the flow stability is realized, and the system working condition adaptability and the precooling effect controllability are remarkably improved.

To provide a method for producing granulated particles for cold storage material particles, enabling a reduction in the production cost of the cold storage material particles.SOLUTION: A method for producing granulated particles for cold storage material particles according to an embodiment includes: mixing a raw material powder comprising a rare-earth oxysulfide containing at least one rare-earth element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu or a raw material powder comprising a rare-earth oxide containing at least one rare-earth element with a binder containing 0.01 wt.% or more to 40 wt.% or less of an organic substance to prepare a raw material mixture; and then granulating the raw material mixture by tumbling granulation, stirring granulation, extrusion, spraying, or press molding, wherein the granulated particles for cold storage material particles have a carbon level of 0.001 wt.% or more and 50 wt.% or less and a relative density of 10% or more and 50% or less.SELECTED DRAWING: Figure 1

The application relates to the field of nuclear fusion, and discloses a cryogenic distribution system of a fusion reactor cryogenic pump and a nuclear fusion device. The cryogenic distribution system of the fusion reactor cryogenic pump comprises a valve box, a cold shield, a cryogenic pump, a 4.5K helium supply pipeline, a 4.5K helium recovery pipeline, an 80K helium supply pipeline, an 80K helium recovery pipeline, a vacuum pump set, a vacuum pump and a vacuum gauge, and the cold shield is arranged on the valve box. The cryogenic pump has an adsorption plate cooling flow channel and a hot shield plate cooling flow channel. The 4.5K helium supply pipeline is connected with the inlet of the adsorption plate cooling flow channel. The 4.5K helium recovery pipeline is connected with the outlet of the adsorption plate cooling flow channel. The 80K helium supply pipeline is connected with the inlet of the hot shield plate cooling flow channel. The 80K helium recovery pipeline is connected with the outlet of the hot shield plate cooling flow channel. The vacuum pump set is arranged outside the valve box and is connected with the valve box. The application can effectively meet the medium demand of the full working condition operation of the cryogenic pump by arranging the helium source supply and recovery paths of multiple temperature levels, and ensures the reliability of the operation of the cryogenic pump.

Equipment and methods for pumps used to cool liquid hydrogen or other cryogenic fluids can be configured to allow for rapid start-up, which also helps to minimize hydrogen loss. Some embodiments may utilize a leakage circuit configured and arranged to support cryogenic cooling operation of the pump, which can minimize hydrogen loss while allowing for significantly improved pump start-up time. Some embodiments may utilize at least one temperature sensor to monitor temperature, and an adjustable control valve that can facilitate the flow of fluid used to cool the pump.

A pump for pumping a cryogenic liquid includes a pump housing having a cylinder with a piston slidably positioned therein. An intermediate fluid chamber that receives an intermediate fluid is defined within the cylinder adjacent to a first end of the piston and a fluid pumping chamber is defined within the cylinder adjacent to a second end of the piston. An intermediate fluid seal is attached to the piston and engages the cylinder. A pumped fluid seal attached to the piston and configured to engage the cylinder, said pumped fluid seal spaced from the intermediate fluid seal so that a differential pressure space is defined within the cylinder between the intermediate fluid and pumped fluid seals. A differential pressure vent valve is in fluid communication with the differential pressure space. A differential pressure switch senses a pressure within the differential pressure space and opens the differential pressure vent valve when the pressure within the differential pressure space reaches a predetermined pressure level.

The application discloses a kind of pry dress formula LNG cold energy, pressure energy recycling system and method, including LNG gas supply device, cold energy recovery power generation device and pressure energy recovery power generation device, can quickly realize LNG gas supply and power generation.LNG gas supply device includes LNG storage tank, cryogenic pump, heat exchanger, pressure energy recovery device, pressure sensor, temperature sensor, odorizing device, cold energy recovery power generation device includes two-stage nitrogen gas brayton cycle device, pressure energy recovery power generation device includes bypass valve, flow regulating valve, flow meter, coaxial two turbine expanders, permanent magnet generator, air temperature type vaporizer, pressure regulating valve.The application is used for tank car transportation LNG, user needed in emergency supply, and utilizes LNG cold energy, pressure energy and other energy power generation, can effectively recover the residual pressure of LNG, cold energy, and improve the comprehensive utilization efficiency of LNG energy, is conducive to the effect of energy saving and emission reduction.

The invention relates to a piston pump (1) for liquefied gases, the pump (1) comprising: - a body (20) comprising an inner casing (20') and an outer casing (20'') delimiting between them an insulation space, the inner casing (20') delimiting an inner volume (3) forming a degassing chamber at least partially accommodating a compression and delivery assembly (30) comprising a piston (32) and a pump cylinder (31), the piston (32) and the pump cylinder (31) being partially accommodated in the inner casing (20'), such that segments (32A) of the piston (32) are accommodated in the degassing chamber (3), the portion of the pump cylinder (31) accommodated in the inner volume (3) comprising a section (40) extending radially into the inner volume (3), the section (40) comprising at least one fin (44) configured to dissipate heat given off by the segments (32A).

The invention discloses a low-temperature cooling system for a superconducting rotor of a superconducting motor, belongs to the field of superconducting motors, and aims to solve the problems that an existing refrigerant transmission device for the superconducting rotor of the superconducting motor is complex in structure and poor in sealing possibly. Comprising a rotor cooling shell, a cooling inner stator, a refrigerant inlet pipe and a refrigerant outlet pipe device. The rotor cooling shell, the cooling inner stator, the refrigerant inlet and outlet pipe and the refrigerant outlet pipe form a cooling loop, a refrigerant is pumped into the cooling loop through the low-temperature pump, the rotor cooling shell is cooled in a convective heat exchange mode, and then the rotor iron core and the superconducting magnet assembly are cooled in a conduction cooling mode. The refrigerant inlet pipe and the refrigerant outlet pipe are static, so that a low-temperature medium is prevented from flowing through the rotary sealing joint, the low-temperature cooling structure is simplified, and the reliability of the superconducting rotor is improved.

The application relates to a dual-mode cooperative control method of a cryogenic pump. The method comprises the following modes: a, operation control mode: adjusting the rotating speed of a refrigerator motor to make the temperature of a primary cold head reach a set value of 65K or 100K; when the rotating speed of the motor is reduced to the lowest limit value and the temperature of the primary cold head is still lower than the set value, a heater arranged on the primary cold head is started to compensate the temperature; b, regeneration control mode: controlling the reverse rotation of the refrigerator motor to make the pump body warm up, and meanwhile, the heater arranged on the primary cold head is started to accelerate the temperature rise of the primary cold head. The purposes include: completely replacing imported high-power heaters to realize the localization and cost reduction of core components of the cryogenic pump; eliminating the excessively large temperature difference between the primary and secondary cold heads in the regeneration process to avoid the abnormality of the equipment caused by the different temperature rises; establishing a staged temperature control mechanism, mainly taking the motor speed regulation as the operation mode and taking the heating compensation as the auxiliary mode, synchronously activating the double actions in the regeneration mode, and improving the system energy efficiency ratio.

A cryogenic extrusion recirculation system and method are provided. In one embodiment, the system includes a cryogenically-cooled extruder configured to form solid deuterium-tritium pellets and discharge the pellets through an extruder nozzle. Excess solid extrusion discharged from the extruder nozzle is received by a cryogenically-cooled auger, which conveys the excess material into a restrictive section. The excess material consolidates in the restrictive section as a solid fuel plug. A heater section is positioned downstream of the restrictive section and applies energy to the leading portion of the solid fuel plug, converting the leading portion of the solid fuel plug into a gaseous phase. This gaseous phase is then recirculated into the cryogenically-cooled extruder to support continuous pellet formation in a controlled and efficient manner. Other embodiments include one or more cryopumps in lieu of the cryogenically-cooled auger for converting the excess material into a gaseous phase for recirculation.

This application discloses a method for maintaining high vacuum under high-speed neutral particle flow field extraction, belonging to the field of low-Earth orbit space environment simulation technology. The method involves coarsely pumping the vacuum container to reduce the pressure below a first pressure value; activating the container's cryogenic pump and the transition section's cryogenic pump to reduce the pressure below a second pressure value, establishing a high-vacuum background environment; activating the gas-helium refrigeration system to cool the cryogenic cold plate, lowering its temperature below a first temperature threshold and its pressure below a third pressure value, forming high-pumping-rate vacuum maintenance conditions; allowing a neutral particle source to extract a high-speed neutral particle flow field through the transition section; and continuously evacuating the introduced gas molecules during the continuous extraction of the particle flow using the container's cryogenic pump, the transition section's cryogenic pump, and the cryogenic cold plate to maintain the pressure below a fourth pressure value. This application solves the technical problem of maintaining high vacuum in a container under high-speed neutral particle flow field extraction.

The utility model relates to the technical field of cryopumps, in particular to a cryopump rapid cooling integrated device which comprises a pump shell, a compressor is installed at the bottom of the pump shell, a first expansion cavity and a second expansion cavity are further formed in the pump shell, and the air outlet end of the compressor is connected with the second expansion cavity through a pipeline. A first cold plate and a second cold plate are coaxially arranged in the pump shell, the first cold plate is sleeved with the second cold plate, first refrigerant channels are formed in the close faces of the first cold plate and the second cold plate, and one end of each first refrigerant channel is connected with the second expansion cavity through a pipeline. According to the utility model, through the first refrigerant channel, the second refrigerant channel and the annular refrigerant channel, a refrigerant which is subjected to primary expansion and cooling can be conveyed, meanwhile, the refrigerant can cool the first cold plate and the second cold plate, and then the refrigerant which is subjected to secondary expansion can be conveyed into the cold column through the return pipe and the air guide pipe so as to rapidly cool the cold column; the cooling speed is high and the use effect is improved.

TITLE: Degassing Separation for Cryogenic Pump The invention relates to a piston pump (1) for liquefied gases, such as hydrogen, comprising a degassing gas separation device (4) arranged between the suction chamber (2) and the degassing chamber (3), the separation device (4) comprising a main body (40) having at least one through-passage (41) connecting the suction chamber (2) and the degassing chamber (3) and a means (42) for closing said passage, the closing means (42) being configured to: - in a closed position (P0), obstruct said passage when the degassing pressure is greater than the suction pressure, - in an open position (P1), open said through-passage (41) when the degassing pressure is less than or equal to the suction pressure. Figure for the abstract: Figure 1

Provided is a cryopump conveyance support tool (10) for attaching / detaching a cryopump (200) to / from a vacuum chamber (102). The cryopump conveyance support tool (10) comprises: a base (12) that is detachably installed below the vacuum chamber (102), the base (12) being configured so as to guide the cryopump (200) from a first position (P1) on the base (12) where the cryopump (200) is carried in or out to a second position (P2) on the base (12) facing an opening (104) of the vacuum chamber (102), or from the second position (P2) to the first position (P1); and a jack (20) that, when the cryopump (200) is at the second position (P2), raises the cryopump (200) to the opening (104) or lowers the cryopump (200) from the opening (104).

The application relates to a phase-change heating regeneration cryogenic pump, which comprises a cryogenic pump body, a heat pipe, a heater and a heat insulation sleeve; the heat pipe is in contact with a primary cold head and a secondary cold head in the cryogenic pump body from top to bottom and penetrates through a cylinder shell of the cryogenic pump body; the height of the heat pipe is continuously reduced from top to bottom; the heater is located outside the cryogenic pump body and is in contact with the heat pipe; and the heat insulation sleeve is sleeved outside the heat pipe and the heater. The ice crystals in the heat pipe move in the heat pipe through gravity, so that the working fluid in the heat pipe can still be phase-change heat conduction after solidification, the heat conduction efficiency of the heat pipe is greatly improved; heat conduction is carried out through the heat pipe, so that the heater is located outside the cryogenic pump body, a heater with larger area and power can be arranged, the heat quantity supplied to the cold head per unit time is increased, the regeneration time is reduced, and the production efficiency is improved.

The inducer 128 is a hub 136 having an outer side surface 144 extending from a front end 146 to a rear end 148, wherein the outer side surface 144 may include a hub 136 having a first cylindrical front portion 150, a frustoconical intermediate portion 154, and a second cylindrical rear portion 152. The inducer 128 is a main blade 140 extending circumferentially along a first helical path across the front portion 150, the intermediate portion 154, and the rear portion 152, wherein the first helical path may include a main blade 140 having an increasing helical angle. The inducer 128 is a splitter blade 142, each of which may further include a splitter blade 142 circumferentially positioned between two of the main blades 140.