78results about How to "Improve insulation life" patented technology

The invention relates to a heat-insulating oil sleeve. The heat-insulating oil sleeve is characterized by comprising an outer pipe, an intermediate pipe and an inner pipe which are sleeved in a clearance fit way; internal threads are machined at one end of the intermediate pipe; external threads are machined at the other end of the intermediate pipe; one end, provided with the internal threads, of the intermediate pipe is welded with the outer pipe at a pipe end, and is welded with the inner pipe at the length position of the preserved internal threads; one end, provided with the external threads, of the intermediate pipe is welded with the outer pipe at the length position of the preserved external threads, and is welded with the inner pipe at the pipe end; an annular cavity formed by the outer pipe and the intermediate pipe is filled with a heat-insulating material and is vacuumized to form a first heat-insulating layer; an annular cavity formed between the intermediate pipe and the inner pipe is vacuumized and is injected with inert gas to form a second heat-insulating layer. A manufacturing method for the heat-insulating oil sleeve comprises the following steps in sequence: performing pretreatment on the three pipes, sleeving and welding the inner pipe and the intermediate pipe, treating the annular cavity between the inner pipe and the intermediate pipe, sleeving and welding the outer pipe and the intermediate pipe, treating the annular cavity between the outer pipe and the intermediate pipe, testing an apparent heat conductivity coefficient and machining threads at the two ends of the intermediate pipe. The heat-insulating oil sleeve has a structure with three layers of steel tubes and double layers of heat-insulating layers, high heat insulation performance, long heat insulation life and high performance.

The invention discloses a heat insulation composition with a heat insulation effect. The problem that the volume weight of the heat preservation composition is large when the heat insulation effect isimproved in the prior art is solved. The heat insulation composition comprises 10-65 wt% of vitrified microbeads, 10-50 wt% of asbestos, 1-20 wt% of aluminum silicate wool, 5-20 wt% of bentonite, 1-10 wt% of glass fibers and 1-10 wt% of a penetrant. The heat insulation composition has the advantages of excellent heat insulation performance, low volume weight, reduction of the thickness by 50% orabove under a condition that the surface temperature is same to that of the aluminum silicate wool, and remarkable energy-saving effect due to great reduction of the heat dissipation area, so the adiabatic temperature range is greatly expanded, and the working temperature range can reach -40-1000 DEG C.

The invention provides a ternary mixed insulation oil and a preparation method thereof. The ternary mixed insulation oil is prepared from base oil and an antioxidant with the mass ratio being 100:0.05to 0.4; the base oil is prepared from the components in percentage by mass: 10 to 25 percent of soybean oil, 3 to 10 percent of palm oil, and 70 to 87 percent of mineral oil; the antioxidant is selected from a phenolic oxidizing agent and/or an amine oxidizing agent. The ternary mixed insulation oil has lower kinematic viscosity and dielectric loss compared with traditional mixed insulation oil so as to have more superior heat dissipation performance, so that a transformer oil paper insulation system has lower operating temperature under the same operating load. The ternary mixed insulation oil has higher power frequency breakdown voltage. The ageing rate of the oil paper insulation system can be effectively retarded, the insulation life of oil paper insulation electrical equipment is prolonged, and the ternary mixed insulation oil has a more excellent environmental protection performance and oil paper insulation system matchability.

The invention discloses a high-heat-conductivity insulating structure and a manufacturing method thereof. The high-heat-conductivity insulating structure comprises an iron core and an electromagnetic wire embedded in the iron core, a heat conducting film, a mica tape and an alkali-free glass tape are sequentially arranged between the electromagnetic wire and the iron core, an opening of the iron core is sealed by a slot wedge, and an inner gap of the iron core is provided with dipping varnish by means of dipping. The high-heat-conductivity insulating structure has the advantages that due to the fact that the heat conducting film, the mica tape and the alkali-free glass tape are sequentially arranged between the electromagnetic wire and the iron core to form a heat conducting passage in the whole insulating structure, internal heat conducting efficiency of a motor is improved, heat in the motor can be transferred to a cooling medium more quickly, and accordingly operation rise of the motor can be lowered to realize cooling of an insulation operation environment so as to prolong insulation service life of the motor.

The invention discloses a trap regulation and control method based on POSS modified terpolymer ethylene propylene rubber. The trap regulation and control method based on POSS modified terpolymer ethylene propylene rubber comprises following steps: OVPOSS nanometer material is dried to remove water; a double-roller mixing mill roller is heated, roller distance and blocking plate distance are adjusted, terpolymer ethylene propylene rubber is introduced into the double-roller mixing mill roller for mix milling, an obtained product is taken out from the double-roller mixing mill roller, and the double rollers are washed; terpolymer ethylene propylene raw rubber is introduced for mix milling and roll banding; OVPOSS nanometer is added into terpolymer ethylene propylene rubber matrix for mix milling; 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane is weighed, and is introduced into the double-roller mixing mill for mix milling so as to obtain an unvulcanized rubber material; the unvulcanized rubber material is taken out from the double-roller mixing mill, is placed between two layers of PET film, is introduced into a high temperature hot processing forming machine die for hot pressing, and obtained rubber sheets are taken out from the high temerpature hot processing forming machine die after cooling; the rubber sheets are suspended in an air blast baking oven, sulfuration is carried outso as to obtain modified terpolymer ethylene propylene rubber sample sheets; the functional group composition and section morphology of the modified terpolymer ethylene propylene rubber sample sheetsare analyzed; rubber sample sheet surface potential attenuation characteristics are measured; SPD method is adopted to obtain trap distribution character diagram and charge mobility characteristics ofthe rubber.

The invention discloses a double-fed type electrically excited synchronous motor. The double-fed type electrically excited synchronous motor comprises a primary unit and a secondary unit which are both of salient pole structures; the primary unit comprises a primary iron core and a primary winding; the primary iron core comprises primary iron core teeth and a primary iron core yoke; the primary winding is arranged in a primary iron core groove formed between the primary iron core teeth; the primary winding comprises an excitation winding and an armature winding; the secondary unit comprises asecondary iron core; the secondary iron core comprises secondary iron core teeth and a secondary iron core yoke; the secondary unit further comprises a secondary winding; the secondary winding is arranged in a secondary iron core groove formed between the secondary iron core teeth; and the secondary winding comprises a secondary armature winding. According to the double-fed type electrically excited synchronous motor, on the basis that the size of an original motor is not changed, an excitation magnetic field is generated through the excitation winding, and the rotor groove space of the motoris fully utilized for mounting the secondary winding, so that the motor is provided with the primary winding and the secondary winding, and the power density and the regulation and control flexibilityof the motor are improved.

The invention provides insulating mineral oil for cooling lithium batteries and a preparation method of the insulating mineral oil. The insulating mineral oil comprises base oil and an antioxidant; the base oil comprises the following components in percentage by mass: 15-30% soybean oil, 1-7% palm oil and 65-82% mineral oil; and the antioxidant comprises glyceride and at least one of the followingcomponents: tertiary butylhydroquinone (TBHQ), butylated hydroxytoluene (BHT) and propyl gallate (PG), wherein the percentage between the mass of each component and the total mass satisfies the following relationships: the TBHQ with mass ratio below 15%, the BHT with mass ratio below 5%, the PG with mass ratio below 5% and the glyceride with mass ratio above 90%. The insulating mineral oil used for cooling the lithium batteries is lower in kinetic viscosity and dielectric loss as compared to the traditional mixed insulating oil, and therefore the insulating oil has better heat dissipation performance, and the oil-paper insulating systems of the lithium batteries have lower operating temperature under the same operating load.

The invention relates to a hydrogenerator, in particular to a shaft extension tubular hydrogenerator. The shaft extension tubular hydrogenerator comprises a rotor, a stator, left and right hoods, an air cooler, a pedestal bearing, a base and an upper hood, wherein the air cooler is placed at the top of the stator; the left and the right hoods are positioned on the two sides of the stator; and the upper hood is positioned at the upper parts of the stator and the left and the right hoods. Air is sealed in an enclosed space formed by the upper hood, the left and the right hoods, the stator and the rotator; and under the rotation action of the fan of the rotor, the circulation line of the air is: the rotor - the stator - the air cooler - the upper hood - the left-right hood - the rotor. According to the shaft extension tubular hydrogenerator, the structure is compact; the cold air is stable and low in temperature and the cooling effect is good due to the adoption of the air cooler for heat exchange; the air is clean, dry and pollution-free; the generator is low in noise; the air cooler is convenient and simple to mount and maintain and not limited by the space; and the workshop foundation is small in excavated volume and low in cost.

The invention discloses a centrifugal compressor and a hydrogen fuel cell system. The centrifugal compressor comprises a machine shell, a rotating shaft, an impeller, a motor assembly, a first volute,a turbine, a second volute and a heat exchanger, wherein the machine shell is equipped with a first cooling medium flow path; the rotating shaft penetrates through the machine shell; the impeller isconnected with one end of the rotating shaft; the motor assembly comprises a rotor and a stator; the rotor is connected with the rotating shaft; the stator is arranged on the outer side of the rotor and connected with the machine shell; the first volute is connected with the machine shell and covers the outer side of the impeller; a first air inlet and a first air outlet are arranged on the firstvolute; the turbine is connected with the other end of the rotating shaft; the second volute is connected with the machine shell and covers the outer side of the turbine; a second air inlet and a second air outlet are arranged on the second volute; a second cooling medium flow path is arranged inside the heat exchanger and communicates with the first cooling medium flow path; the heat exchanger isequipped with a penetrating airflow channel; and the airflow channel communicates with the second air outlet. The hydrogen fuel cell system comprises an electric pile and the centrifugal compressor.By the adoption of the technical scheme, the energy utilization rate can be higher and the service life can be prolonged.

The invention relates to a prestressed thermal insulation oil casing. The prestressed thermal insulation oil casing is characterized by comprising an outer tube, a middle tube and an inner tube which are sleeved at intervals, wherein an internal thread is processed on one end of the middle tube, an external thread is processed on the other end of the middle tube, one end, which is provided with the internal thread, of the middle tube is welded with the outer tube at a tube end, and is welded with the inner tube at a reserved internal thread length position, one end, which is provided with the external thread, of the middle tube is welded with the outer tube at a reserved external thread length position, and is welded with the inner tube at a tube end; an annulus, which is formed by the outer tube and the middle tube, is filled with a thermal insulation material, and is vacuumized so as to form a first thermal insulation layer, after an annulus, which is formed by the middle tube and the inner tube, is vacuumized, inert gas is filled so as to form a second thermal insulation layer; the prestressed thermal insulation oil casing comprises the following production steps of pretreating three tubes, sleeving and welding the inner tube and the middle tube, treating the annulus of the inner tube and the middle tube, sleeving and welding the outer tube and the middle tube, treating the annulus of the outer tube and the middle tube, testing a visible heat conductivity coefficient and processing screw threads on two ends of the middle tube in sequence. The prestressed thermal insulation oil casing is provided with three layers of steel pipes and two layers of thermal insulation structures, so that the prestressed thermal insulation oil casing has good thermal insulation performance and excellent working performance.

The invention provides a PVC (Polyvinyl chloride) protective corner technology for an external corner in heat insulation construction of an exterior wall. The technology comprises the following steps of laying a finished PVC protective corner with double-wing mesh cloth at each position of external corners, such as large external corners, windows, cornices and holes, of a wall surface before surface mortar is plastered on the exterior wall for heat insulation for the last time; arranging a through line at each external corner position; firstly plastering rendering putty on the bottom layer, adjusting the protective corner installation position according to the through line, pressing the double-wing mesh cloth, then plastering wall surface putty and pressing glass fiber mesh cloth, and plastering the surface mortar for the last time. The PVC protective corner technology for the external corner in the heat insulation construction of the exterior wall has the advantages that the heat insulation quality and acceptance check of the exterior wall conform to standard error requirements, the sealing property and safety of the exterior heat insulation system of the exterior wall are improved, and the durability of the exterior heat insulation system of the exterior wall is guaranteed; meanwhile by utilization of the protective corner, the construction speed is increased, the construction period can be shortened, the labor cost is reduced, the construction cost is reduced, the impact resistance of the external corner is improved, a wall corner is effectively prevented from being damaged, the appearance quality is improved, the construction quality is improved, and the service life of the exterior wall for heat insulation is prolonged.

This invention relates to the method for the design and evaluation of a steam turbogenerator stator winding insulation life (SWIL). The characteristics are: the soft-ware for the design of F-grade SWIL programmed by C-language is installed in a computer of the design and research department of a steam turbogenerator producer. The evaluation procedures are: determining the desired value of the generator service life, calculating the thermal aging SWIL, calculating the electric aging SWIL, calculating the accumulated loss of the thermal aging SWIL, determining the boundary value Dco the said accumulated loss, and finally proceeding this inventive design and evaluation. The advantages are: quantitative forecasting, quantitative evaluation and improvement of F-grade SWIL, meeting the technical requirement of 40 years life.

The invention discloses a vacuum composite heat-insulating pipeline connecting structure, which comprises vacuum composite heat-insulating pipes, a coupler and a gland bush, wherein the coupler is a tubular structure; the two ends of an inner hole of the coupler are provided with threaded tapered holes respectively of which outer ends are greater while inner ends are smaller and which are connected with connecting parts of the two adjacent vacuum composite heat-insulating pipes respectively; the outer surface of the connecting part of the vacuum composite heat-insulating pipe is a threaded tapered surface matched with the threaded tapered hole at any end of the inner hole of the coupler; the end face of the vacuum composite heat-insulating pipe is provided with at least one circle of groove along a circumferential direction; and the gland bush is arranged in the groove between the end faces of the two vacuum composite heat-insulating pipes. The vacuum composite heat-insulating pipeline connecting structure can greatly improve heat-insulating property at junctions of the pipeline, prolong the heat-insulating service life of the pipeline, reduce the number of pipeline connecting parts and simplify the assembly process of the pipeline connecting parts, and is especially applied to the coupling of underground oil pipes for steam injection and oil extraction.

The invention provides a bulb tubular hydraulic generator, and belongs to the technical field of hydroelectric power generation equipment. The bulb tubular hydraulic generator comprises a bulb head and a stator frame integrally fixed and arranged in a co-movable manner, a generator body fixed in the stator frame, a stator upstream flange clamped between the stator frame and the bulb had, at least a group of ventilation assembly, and at least one group of wind screen assembly, a plurality of ventilation assemblies are fixed on the stator upstream flange and uniformly distributed at intervals in a co-circumferential manner, the wind screen assemblies are detachably fixed in the stator frame, the wind screen assemblies and the stator upstream flange are constructed to form a single-circulation air supply unit in which the wind screen assemblies communicate with the ventilation assemblies and the wind screen assemblies and the ventilation assemblies are mutually independent, the generator body comprises excitation assemblies, and the excitation assemblies and the stator frame are arranged in a coaxial manner. According to the bulb tubular hydraulic generator, brushless double-frequency generation can be realized, brushless variable-frequency generation can also be realized, the energy consumption of the whole ventilation system is reduced, the axial air quantity distribution can be effectively improved, and the ventilation and heat radiation effects of a unit can be improved.