49results about How to "Reduce cold loss" patented technology

The invention discloses a natural-gas flow-temperature helium extracting system and a natural-gas flow-temperature helium extracting method. According to the system and the method, the post-expansion and nitrogen circulating refrigerating two-column separating technology is carried out for fully recovering the cooling capacity of the device in order to pre-cool the natural gas which serves as the raw material, and thereby the system can be applied to the natural gas which has an extremely low content of helium, and has the characteristics of being low in energy consumption, high in helium recovery rate, small in investment, flexible in operation, and high in adaptability to variable working conditions. The system and the method have the positive effects that little helium in the helium-containing natural gas can be extracted by a pre-cooling system and a low-temperature rectifying system, an independent nitrogen circulating refrigerating system is adopted and used for supplying an ultralow-temperature cold source required in helium concentration, and the independent system is rich in adjusting means and cannot be influenced by upstream operations; and a post-expansion refrigerating system is adopted, so that the natural-gas low-temperature helium extracting system has the operation pressure higher than that in conventional technology, and higher concentration of the helium can also be obtained at the same refrigerating temperature.

The invention discloses a novel external pressurized and internal liquefied pure nitrogen preparation device which comprises a filter, a turbine air compressor, an air pre-cooling unit, alternatively-used molecular sieve adsorbers, an electric heater, a main heat exchanger, a supercharging expansion machine, a rectification column I, a rectification column II, a condensing evaporator I, a condensing evaporator II, a subcooler, a liquefier and a supercharger. The invention also discloses a novel external pressurized and internal liquefied pure nitrogen preparation method. According to the device and method, sewage nitrogen reflux expansion refrigeration is adopted, the pressure utilization efficiency is high, and the energy consumption of the device is low; double tower parallel nitrogen production is adopted, the upper tower pressure can be higher or lower than the lower tower pressure, and two nitrogen products with the same pressure level or different pressure levels can be preparedsimultaneously, and some liquid nitrogen products can be prepared; and an internal liquefier and an external supercharger are arranged, the external supercharger is located outside a cold box, maintenance and overhaul are facilitated, the internal liquefier is located inside the cold box, the cold loss is small, meanwhile, the selected type of the external supercharger is not limited, and therefore the application range of the device and the method can be greatly increased.

The vacuum low temperature ball valve comprises the clamping part, seal part and the drive part, with the clamping part composed of inlet flange, outlet flange and the outside shell connected in the middle, the seal structure composed of the valve inside the jacket with both ends fixed on the inlet and outlet flanges, fixed on the spring valve base at the inlet end of the valve through the screw bolt and nut and two seal bases with seal cushion embedded at both sides, with one connected to the spring valve base and the other connected to the valve. The drive part comprises the ball floating inside the valve, both sides of the ball contacting with two seal base, sliders on the top of the ball, with spring base and spring connected to the valve at the bottom of the ball. There are valve bar, guide sleeve and drive mechanism on the slider. It has good seal feature, high reliability, less cold loss, and long working cycle.

The invention relates to a main-sub pot-type combined container for liquid nitrogen. The container comprises sub pots, a pipeline system, an interlayer, a main pot, a measurement and control system, safety accessories and an external operation platform; the combined container for the liquid nitrogen is coated with paint and mounted on a basic platform; five sub pots are distributed concentrically to form an equilateral polygon; the pipeline system is arranged in a center area from five sub pots to the main pot; each sub pot adopts the structure of a vertical cylinder; the bottoms of the sub pots are supported by support legs; a filling opening, an air outlet, an external pressurization opening and an upper shifting filling opening are formed in each pot. The combined container can be used for implementing the processes of shifting filling, pressurization, pressure release, and real-time monitoring and control, and is ideal large-sized liquid nitrogen storage and supply equipment. The container is used for storage and supply of the liquid nitrogen, liquid is discharged out through a pressure extrusion method, the operation is simple, the reliability is high, discharge loss during the storage period is reduced through storage under pressure, compared with a spherical tank, the main-sub pot-type combined container is easier to manufacture and mount, and the manufacturing and mounting costs are low, therefore, the container has relatively high security, stability and controllability.

The invention relates to spacecraft environment simulation test equipment and discloses a 20K cold shield refrigerating device which comprises a G-M refrigerator (26), wherein the G-M refrigerator (26) is installed on an installation tool (25) through a vacuum sealing surface, a cold shield shielding plate (23) is installed on and connected with a primary cold head (24) of the G-M refrigerator (26), and a secondary cold head (22) of the G-M refrigerator (26) is connected with a 20K cold shield (21) in a fastening and heat conducting way. The 20K cold shield refrigerating device is installed at the top in a vacuum simulation cabin (12) in a vacuum sealing way through the installation tool (25). The invention solves the problems of high development cost, long development cycle and the like of the traditional equipment and has the advantages of high running reliability of the equipment, simplified operation flow, lowered equipment running cost, shortened preparation time before system boot time, and the like.

The invention relates to a pipe insulation tile which is produced by urea-formaldehyde foam powder and a preparation process. The pipe insulation tile is formed by the following components according to the ratio of parts by weight, urea-formaldehyde foam powder: polyvinyl alcohol gelatin powder: cellulose ether: waterproofing agent: water =80-120:0.5-2:0.1-0.3:0.2-0.8:5-15. The invention has small thermal conductivity factor, can effectively prevent or reduce heat in the surrounding environment from transmitting into devices, pipes and accessories under constant temperature, reduces cold loss, saves energy, prevents or reduces the temperature of cold dialectic in the devices and pipes under the constant temperature from increasing, and prevents the temperature of outer walls from lowering the temperature of the surrounding environment, and prevents the outer surface condensation of the pipe to damage a cold insulation structure, thereby prolonging the service life of cold insulation devices, and being beneficial for improving working environments. The pipe insulation tile has the advantages of corrosion resistance, anti-aging, excellent heat insulation and sound insulation value, light weight, convenient installation, durable service, long service life, environmental protection and beauty appearance.

The invention provides a liquid helium conveying system used for large-size multi-section liquid helium heat sinks and a class converting method for converting liquid nitrogen to liquid helium of the liquid helium heat sinks on the basis of the liquid helium conveying system. The liquid helium conveying system and the method are applied to an engine vacuum plume experimental study. The liquid helium conveying system comprises a heat sink system, a liquid nitrogen supplying system, a liquid helium supplying system, a nitrogen supplying system and a helium supplying system. The heat sink system comprises five large-size liquid helium heat sinks and four liquid nitrogen heat sinks. The liquid nitrogen supplying system is provided with conveying pipelines for the liquid helium heat sinks and the liquid nitrogen heat sinks, and provided with a liquid nitrogen cooling box and a liquid helium cooling box, wherein the liquid nitrogen cooling box and the liquid helium cooling box are used for centrally containing and managing liquid nitrogen adjusting valves and liquid helium adjusting valves. According to the liquid helium conveying system used for the large-size multi-section liquid helium heat sinks and the class converting method for the large-size multi-section liquid helium heat sinks, liquid helium refrigeration can be provided for the large-size multi-section liquid helium heat sinks at the same time, unified liquid supplying is achieved for all the heat sinks, operation is convenient, cost is saved, floor space is small, the valves can be centrally controlled conveniently, working efficiency is improved, and operation and maintenance are convenient.

The invention provides a two-position three-way reversing valve and a reversing method used for a small-flow liquid nitrogen low-temperature system. The reserving valve is a single electrical-controllever corrugated tube valve driven by an electromagnet, and comprises a valve body structure, a corrugated tube sealing structure, a lever hinge reinforcing structure and an electromagnet power generation structure, wherein the valve body structure comprises a valve seat, a double-conical-surface movable valve rod, an upper conical surface sealing base, a lower conical surface sealing base and a movable valve element connecting rod; the corrugated tube sealing structure comprises a corrugated tube and an elastic connector; and the lever hinge reinforcing structure comprises a first conductingpiston, a reinforcing connecting rod and a second conducting piston. The two-position three-way reversing valve has the advantages that the two-position three-way reversing valve is suitable for beingused under an ultra-low temperature environment, and is especially suitable for being used under a small-flow low-temperature environment. The cut-off valve principle is utilized for switching to thedouble-conical-surface movable valve rod for sealing and opening the upper conical surface sealing base and the lower conical surface sealing base so as to realize reversing of ultra-low-temperaturefluid. The two-position three-way reversing valve for the small-flow liquid nitrogen low-temperature system has the characteristics of a small size, a little cold loss, small leakage amount and quickresponse.

The invention discloses a mining membrane type high-low pressure conversion device, and belongs to the technical field of mine refrigeration machines. The mining membrane type high-low pressure conversion device comprises a refrigeration station arranged outside a mine and a radiator arranged in the mine, and further comprises a first container and a second container which are arranged in the mine, a first elastic membrane is arranged in the first container, a second elastic membrane is arranged in the second container, the first container and the second container are divided by the first elastic membrane and the second elastic membrane respectively into the cold water sides and the hot water sides, the cold water sides of the first container and the second container are communicated with a water outlet of the refrigeration station and a water inlet of the radiator respectively, and the hot water sides of the first container and the second container are communicated with a water return opening of the refrigeration station and a water outlet of the radiator respectively. As only membrane elastic deformation in the containers is adopted in the high-low pressure conversion process for transferring, the cold losses are small, accurate control is carried out, the working condition of the refrigeration station is matched with the actual refrigeration load, the operation energy consumption of the refrigeration station is reduced, and the temperature of a local area in the mine can be efficiently reduced.

This invention is about a cascade cold dynamic cycle refrigeration apparatus, which makes up cold energy with cryogenic liquid refrigerant by boosting with a dual-stage liquid circulating pump, after its temperature is increased via the cold regenerator, it enters the cold consuming apparatus to provide cold and becomes a gaseous refrigerant, then it flows through the expander to expand and make work by reducing pressure and temperature, and then returns to the refrigerant tank via the cold regenerator or/and throttle valve. This invention requires no circulation cooling water system as in a traditional vapor compression refrigeration apparatus, so its maintenance and operation cost can be substantially reduced, with a apparatus of the same refrigerating capacity, it can save energy by more than 30% as compared with traditional ones, as compared with traditional refrigerating circulation technology, it can adopt enhanced cold transfer elements more conveniently, with more compact refrigerating equipment and higher refrigerating efficiency.

The invention relates to a constant-temperature draught fan used on a conveying belt of spraying equipment, and belongs to the field of draught fans. The constant-temperature draught fan comprises a refrigeration main case. Air curtain machines are arranged at an air inlet and an air outlet of the refrigeration main case. A plurality of outer rotor motors are arranged at the bottom of the refrigeration main case in parallel. An evaporator and a condenser are arranged in the refrigeration main case. Heating pipes are laid in the evaporator and connected with an outer electric control box. A heat preservation box body is arranged below the refrigeration main case and erected on the conveying belt of the spraying equipment, so that the air direction is perpendicular to the moving direction of the conveying belt. A temperature control switch is arranged in the electric control box and connected with a temperature sensor. According to the constant-temperature draught fan, the optimal air supply temperature can be provided for sprayed articles according to the environment temperature, and energy consumption is low.

The invention relates to an immersed pump system in a low-temperature tank and belongs to the technical field of low-temperature liquid conveying. The problems that an existing immersed pump is not convenient to install and poor in use effect are solved. The immersed pump system comprises the low-temperature tank and an immersed pump and further comprises a pump well which is arranged in the low-temperature tank and is used for isolating the low-temperature tank and the immersed pump, a pump well upper installation seat which is arranged at the upper portion of the pump well and used for installing the pump well, and a top plate arranged on the pump well upper installation seat. A valve body is arranged at the lower portion of the pump well, and the lower portion of the valve body is connected with a valve plate through an elastic assembly. A gas phase pipeline is arranged at the upper portion of the low-temperature tank. A gas phase valve is arranged on the gas phase pipeline. The gasphase pipeline passes through the gas phase valve, then penetrates the pump well upper installation seat and then communicates with the pump well. An air inlet pipeline at the upper portion of the gas phase pipeline is provided with a nitrogen valve.