153 results about "Double walled" patented technology

The invention relates to the technical field of gas engines, and particularly discloses an anti-deformation and high-cooling-efficiency backflow combustion chamber large elbow, the sections of a first layer wall and a second layer wall of the large elbow are arc-shaped, the first layer wall is arranged outside the second layer wall, one end of the first layer wall and one end of the second layer wall are fixedly connected into a whole, and the other end of the first layer wall is arranged outside the second layer wall. The other end of the first layer wall and the other end of the second layer wall are clamped, a space capable of moving relative to each other is formed in the clamping position, a plurality of annular grooves facing the second layer wall are formed in the first layer wall, the annular grooves are attached to the side, facing the first layer wall, of the second layer wall, and a cavity between the first layer wall and the second layer wall is divided into a plurality of impact diffusion cavities through the annular grooves. According to the invention, the gap between the double walls is not changed, the problem of deformation caused by stress due to inconsistent swell capacity of the double walls is prevented, the cooling protection effect of the inner wall is enhanced, cracks caused by too high temperature of the large elbow are prevented, the overall stress is small, cracks are not easy to appear at welding joints, tight connection is realized, and air leakage is not easy.

The invention belongs to the field of nano material preparation, and particularly discloses a preparation method and application of a narrow-diameter-distribution carbon nanotube, and the preparation method comprises the following steps: heating raw material mixed gas to 900-1500 DEG C for reaction, and introducing pulse gas in the reaction process to prepare the carbon nanotube, the raw material mixed gas contains a catalyst, a carbon source and an etching agent; the heating comprises at least two methods of plasma heating, microwave heating, silicon carbide rod heating, silicon molybdenum rod heating, resistance wire heating and electromagnetic induction heating. According to the preparation method disclosed by the invention, the high-quality narrow-diameter-distribution single-wall / double-wall carbon nanotubes can be prepared on a large scale, the single-time continuous operation time in actual production exceeds 45h, the unit yield can reach more than 190g / h, the purity of the product single-wall / double-wall carbon nanotubes is greater than 85%, the average G / D ratio is greater than 85, and the quality and the yield of the prepared carbon nanotubes are remarkably improved.

The invention provides a marine ammonia fuel ventilation system and a control method and a control system thereof. The control method comprises the following steps: before a host is not connected, communicating an inlet pipe and a return pipe of an outer pipe of a double-wall pipe together, and carrying out an annular space tightness test; carrying out a leakage test on the valve, and testing whether the pneumatic double-stop ventilation valve is in a normal working state or not; when ammonia gas is detected, low-pressure nitrogen purging is started, and the ammonia gas is purged to an ammonia gas treatment device. By means of a high-pressure nitrogen automatic pressure testing mode, pipeline testing is conducted before the ventilation system is used, and it is ensured that the system is safe and reliable when used every time; a nitrogen purging valve group of the ammonia fuel ventilation system is provided with a tightness self-checking program, and the tightness of the valve is checked before each operation, so that the safety and reliability of the system are ensured when the system is used each time; besides a high-pressure nitrogen purging mode, a low-pressure nitrogen purging mode is designed, ammonia gas is purged to the ammonia gas treatment device, it is guaranteed that no ammonia gas leaks, and the safety of the system is improved.

A marine liquid ammonia fuel supply system capable of cooling a diesel nozzle utilizes a liquid ammonia supply system matched with a dual-fuel main engine and cold energy of low-temperature liquid ammonia fuel, a cylinder in the dual-fuel main engine is provided with an ammonia fuel nozzle and the diesel nozzle, and a heat exchange coil is wound outside the diesel nozzle. Liquid ammonia is injected into a cylinder through an ammonia fuel nozzle to combust and do work, after an ammonia fuel mode of the dual-fuel main engine is finished, nitrogen is utilized to purge a fuel supply pipeline and the interior of the dual-fuel main engine, a gas-liquid mixture is purged to an ammonia gas treatment unit through a backflow double-wall pipe to be subjected to gas-liquid separation, separated liquid ammonia returns to a buffer tank, and the ammonia fuel mode of the dual-fuel main engine is finished. And the separated gas is guided into the ammonia gas absorption device through the receiving tank. The cooling function of the main engine on the nozzle in the diesel oil mode can be achieved, and compared with a traditional technical scheme that a fresh water cooling system is independently arranged, the cooling system has the advantages of being low in cost, small in extra occupied space, simple in system configuration, good in cooling effect, capable of saving energy, reliable in operation and the like.

The utility model discloses a heatable intake manifold suitable for a methanol engine, which comprises an intake manifold main body and an intake manifold heating branch, interlayers are arranged in double walls of the intake manifold main body, the intake manifold heating branch comprises a temperature control throttle valve, an intake manifold interlayer and a reversing valve, the intake manifold interlayer is provided with a water inlet, and the reversing valve is provided with a water outlet. Fin plates are embedded in the air inlet manifold interlayer, electric heating wires are embedded in the air inlet manifold interlayer, a water inlet of the air inlet manifold interlayer is connected to a temperature control throttling valve through a water channel, an output port of the temperature control throttling valve is connected to a water outlet main pipe, and a water circulation pipeline passes through a wax type thermostat from the water outlet main pipe. The thermostat first water circulation of the wax type thermostat is that the wax type thermostat is connected with a reversing valve and then is connected to an engine cylinder sleeve, and the thermostat second water circulation connected with the output end of the wax type thermostat is that the wax type thermostat is connected to a water tank and is connected to the engine cylinder sleeve through the water tank. According to the utility model, the direct heating of the intake manifold is efficiently realized, and the heating efficiency of the intake mixed atmosphere is improved.

The invention discloses an optimized arrangement structure of a low-pressure gas pipe route for an LNG (liquefied natural gas) dual-fuel container ship, which comprises an LNG fuel cabin, a gas preparation room and a cabin area, the gas preparation room is arranged above the LNG fuel cabin, the gas preparation room is communicated with the cabin area through a low-pressure gas pipe, and the cabin area is communicated with the LNG fuel cabin. And the low-pressure gas pipe is arranged in a way that the gas preparation room passes through the longitudinal hatch coaming area above the main deck and is connected to the cabin area. According to the invention, the gas pipe is arranged in the open area above the main deck and the joints of the pipes are all welded, so that a single-wall pipe replaces a double-wall pipe, the channel arrangement of the main deck is not influenced, the length of the gas pipeline is not increased, and the construction cost is reduced.

The invention discloses an internal combustion type carbonization system based on material whole-course spiral propulsion, which comprises a carbonization furnace, a feeding auger, an ignition device, a first air blower and a second air blower, the carbonization furnace linearly extends along the left-right direction, and the right end of the carbonization furnace is provided with a carbon discharge port; a drying preheating area, a main carbonization spontaneous combustion area and a burnout carbon discharge area are sequentially formed in the hearth in the advancing direction of materials; through the partition design in the hearth and the whole-course penetrating layout of the feeding auger feeding pipe, materials are turned over, fed and carbonized in the pipe at the same time, and the problems of uneven carbonization and product quality fluctuation caused by static material accumulation or simple pushing of traditional external combustion type equipment are thoroughly solved; meanwhile, due to the internal combustion type design, pyrolysis gas can be spontaneously combusted in the furnace, heat directly acts on a feeding pipe and materials, heat loss caused by external combustion type double wall surface conduction is avoided, the heat utilization rate can be greatly improved, system self-circulation can be achieved under the condition that external continuous energy supply is not needed, and the operation cost is reduced.

The present invention discloses a method for calculating the starting pressure and circulating gas supply pressure of gas lift reverse circulation drilling, comprising the following steps: S1. calculating the hydrostatic pressure at the bottom of the inner tube of a double-wall drill pipe; S2. calculating the friction loss pressure of the compressed air in the outer annulus of the double-wall drill pipe; S3. calculating the friction loss pressure of the compressed air flowing through the surface gas transmission channel; S4. calculating the local pressure loss of the compressed air from the outer tube of the double-wall drill pipe through the orifice on the gas-liquid mixer; S5. calculating the friction pressure loss of the liquid phase flow in the inner tube of the double-wall drill pipe; S6. calculating the friction pressure loss of the liquid phase flow in the slag discharge pipeline; S7. calculating the three-phase flow pressure drop in the inner tube of the double-wall drill pipe; S8. calculating the starting pressure and circulating gas supply pressure. The method for calculating the starting pressure and circulating gas supply pressure of gas lift reverse circulation drilling of the present invention can accurately and conveniently calculate the starting pressure and circulating gas supply pressure of gas lift reverse circulation drilling by accurately calculating the pressure of each part of the gas lift reverse circulation drilling process, providing a theoretical basis for the stable and efficient operation of the circulation system.

A thermosiphon condensation heating system for heating a space and / or water using a plurality of heat packages is disclosed. The thermosiphon condensation heating system includes one double-walled heating unit and a controlling system. The double-walled heating unit comprises one inner chamber, one outer chamber, one perforated heater, and a closed-loop thermosiphon system. The closed-loop thermosiphon system includes one inner tubular coil with a rectangular cross-sectional structure, one outer tubular coil with a rectangular cross- sectional structure, a connection pipeline connecting the inner tubular coil and the outer tubular coil together, a predetermined amount of heat-transfer fluid, and at least one heat-exchange unit. The plurality of heat packages includes heat-transfer fluid vapor packages directed toward the at least one heat-exchange unit for releasing latent heat energy of heat-transfer fluid vapor packages all at once upon reaching the heat-exchange unit.

A gravity fed smoker includes a smoking enclosure and an external stack. The stack is double walled with an inner wall, and an outer wall. A vented cooling space exists between the inner wall and the outer wall. An inner chamber of the external stack includes a fire box with a fire grate and a feed hopper positioned above the fire box. A smoke tunnel with a series of openings for releasing smoke into the smoking enclosure extends along the bottom of the food smoking enclosure and is connected to the external fire box at one end. Fuel, including charcoal, lump coal, or wood pellets, is loaded into the feed hopper. As the fuel burns on the fire grate and turns to ashes, the fuel is fed from the hopper onto the fire grate by gravity. A fan and dampers controls air flow through the fire grate and into the smoke tunnel.

The application relates to the technical field of low-flash-point fuel double-wall pipe devices, and discloses a low-flash-point fuel double-wall pipe device and an assembling method thereof, which form a set of high-efficiency welding, folding and mounting processes for the inner pipe and the outer pipe of the double-wall pipe, ensure that the welding requirements are fully met, the mechanical performance of the welding seam is improved, the forming quality of the welding seam is improved, and the one-time inspection qualified rate is high.

A fluid assembly comprising: a first conduit extending in an axial direction and configured to carry a fluid, a double walled outer second conduit extending in the axial direction; the second conduit having an inner wall and outer wall and a first interspace between the inner and outer walls, wherein the first conduit is housed inside the second conduit to form a second interspace between the first conduit and the inner wall of the second conduit.

The invention relates to a safety heat exchanger 1 with a first flow channel 2 for a first medium and with a second flow channel 3 for a second medium, wherein the two flow channels 2, 3 are separated from each other by a double wall 7, wherein the double wall 7 has a first wall 8 and a second wall 9 which define a leakage space 11 between them, wherein an open-pore metal foam 12 is arranged in the leakage space 11, which is in contact with both walls 8, 9.

The utility model relates to an external cylinder cover air inlet channel methanol injection switching system, and relates to the field of ship engineering and power systems. The methanol spraying device comprises a cylinder cover, a front-end switching block arranged at one end of the top of the cylinder cover, a methanol spraying device penetrating through the front-end switching block, a middle-end switching block arranged at the top of the methanol spraying device and connected with the front-end switching block, a rear-end switching block arranged on the middle-end switching block, a methanol distribution block arranged on the rear-end switching block and a methanol double-wall pipe arranged on the methanol distribution block. The alcohol spraying device is obliquely arranged above the air inlet channel and follows the air inlet direction, so that the spraying resistance is reduced; the methanol double-wall pipe is connected to the two transverse sides of the methanol distribution block, and methanol is supplied to the methanol sprayer through the middle-end adapter block and the rear-end adapter block. The external connection type design is adopted, large-scale transformation of an existing engine structure is not needed, the transformation cost and the implementation difficulty are reduced, and the engine is suitable for various types of ship engines.

The invention discloses an air tightness test tool and test method for a dual-fuel engine air injection assembly in the technical field of dual-fuel engine component detection, the test tool comprises a first sealing cover plate, two groups of symmetrically arranged side face test cover plates and a second sealing cover plate, the second sealing cover plate comprises an upper cover plate and a second connecting pipe, and the upper cover plate and the second connecting pipe are connected through a first connecting pipe and a second connecting pipe. The upper cover plate is fixed on an upper interface of the double-wall connecting pipe, the second connecting pipe is arranged on the upper cover plate, one end of the second connecting pipe is used for being communicated with the natural gas chamber, and the other end of the second connecting pipe is used for being connected with external equipment for supplying compressed gas through the detection connecting piece. When the ball valve in the detection connecting piece is closed, the two groups of sealing plates can be driven by the transmission part to be close to each other to seal the inner cavity of the connecting seat, so that the leakage of compressed gas in each cavity caused by internal leakage due to abrasion of a sealing surface or invasion of impurities in long-term use of the ball valve is effectively prevented; and the stability of pressure reading and the accuracy and reliability of a test result in the detection process are ensured.

Impact insert (80) for a turbomachinery component, the impact insert (80) comprising: - a double-walled section (1, 2) having an inner wall (81) and an outer wall (82) defining an inner channel (501) formed on an inner surface (81a) of the inner wall (81), an outer channel (503) formed on an outer surface (82b) of the outer wall (82), and a central channel (502) formed between the inner surface (82a) of the outer wall (82) and the outer surface (81b) of the inner wall (81); and - a plurality of impact cooling holes (85) formed in the outer wall (82) and configured to eject impact jets (86) into the outer channel (503), wherein the impact jets (86) are formed from the cooling air (5) of the central channel (502); characterized in that the impact insert (80) further - at least one suction line (9) extending between the outer wall (82) and the inner wall (81) over the central channel (502) and comprising an inlet (9a) on the outer channel (503) and an outlet (9b) on the inner channel (501) for sucking cooling air (5) from the outer channel (503) into the inner channel (501), and wherein the suction line (9) is aerodynamically shaped with respect to a flow of the cooling air (5) flowing through the central channel (502).

A dual-walled component of a gas turbine engine includes a cold section part, such as a spar, and a hot section part, such as a coversheet. The cold section part includes a single crystal or directionally solidified metal alloy and defines an outer surface, a hot section part comprising a polycrystalline metal alloy formed using additive manufacturing. The hot section part includes a plurality of support structures forming a plurality of cooling channels and defining an inner surface. The outer surface of the cold section part and the inner surface of the plurality of support structures are diffusion bonded.

The invention provides a reactive powder concrete double-wall full-capacity liquefied natural gas storage tank and a construction method, and belongs to the technical field of civil engineering. The problems that an existing storage tank project is high in construction cost, difficult to construct, complex in process and long in construction period are solved. The device comprises an inner tank, an outer tank and a connecting component, the inner tank and the outer tank are both built on an external concrete bearing platform, the inner tank is sleeved with the outer tank, and the connecting component is located between the inner tank and the outer tank and fixedly connected with the inner tank and the outer tank. The device is mainly used for storing a large amount of liquefied natural gas.

The invention discloses a self-adaptive lap joint flange for an outer pipe of a fuel gas double-wall pipe of a marine low-speed diesel engine, which is movably connected to the end part of the outer pipe of the double-wall pipe and comprises an inner hole, the inner hole is a stepped hole, a gap is formed between the inner hole and a flange of the inner pipe of the double-wall pipe, and the inner hole comprises a large hole and a small hole which are coaxially connected; the inner wall of the small hole is a sliding sealing face, and a sealing ring is arranged between the sliding sealing face and the periphery of the outer pipe. After the inner pipes are assembled in a paired mode, if centering deviation of the outer pipes is caused by machining errors, radial stress generated by deformation of the outer pipes can be eliminated by adjusting gaps between the lap joint flanges and the outer pipes, and the lap joint flanges can axially slide along the outer pipes; the axial stress of the flange on the pipeline can be reduced or eliminated through sliding of the lap joint flange, so that the pipeline is prevented from being broken. The reliability, stability and safety of gas pipeline connection are improved.

A leak and outgassing inspection system according to an embodiment of the present invention comprises: a vacuum transmitter configured to measure the pressure of an insulation space of a double wall of a liquefied gas storage tank; a vacuum pump mounted on a vacuum pipe connected to the insulation space of the double wall of the liquefied gas storage tank, and configured to operate when the pressure of the insulation space measured by the vacuum transmitter rises above a set pressure; and a determination unit analyzing a component of gas sampled during operation of the vacuum pump, and determining whether a cause of an increase in the pressure of the insulation space is any one of a leak or outgassing of the double wall on the basis of an analysis result.

The utility model relates to an ammonia fuel ship tail gas denitration system, which is characterized in that an ammonia supply pipeline of an ammonia fuel engine in the system adopts a double-wall pipe, an inner pipe of the double-wall pipe is used for conveying liquid ammonia, and an outer pipe of the double-wall pipe is connected with an ammonia treatment system through a fan so as to suck leaked ammonia gas to the ammonia treatment system; the ammonia treatment system is connected with the buffer tank through a fan and is used for conveying the discharged gas to the buffer tank after pressurizing the discharged gas through the fan; the ammonia treatment system is connected with a reducing agent tank through a pump; the reducing agent tank receives ammonia water of the ammonia treatment system through the pump; the SCR reducing agent supply system is connected with the reducing agent spray gun through the reducing agent tank and the buffer tank and used for conveying the discharged gas to the reducing agent spray gun through the SCR reducing agent supply system to assist in atomizing ammonia water. According to the tail gas denitration system for the ammonia fuel ship, ammonia water generated in the ammonia treatment system is used as a reducing agent of the SCR system, and discharged gas of the ammonia treatment system is used as auxiliary atomization gas of the reducing agent, so that waste is recycled, and the denitration efficiency is improved.

A double wall (2) for a combustion chamber (1) of a gas turbine of an aircraft, the double wall (2) comprising an inner wall (21) configured to be in contact with a combustion reaction and an outer wall (22) kept at a distance from the inner wall (21), the outer wall comprising a plurality of openings (3) so as to allow the circulation of a cooling flow (F) outside the outer wall (22) so as to cool the inner wall (21), the inner wall (21) being free of perforations so as to prevent the circulation of the cooling flow (F) towards the center of the combustion chamber (1). The double wall (2) is characterized in that the inner wall (21) comprises a plurality of members (4) projecting towards the outer wall (22), each projecting member (4) comprising a foot (4a) and a cylindrical head (4b) having a circular cross section, the head (4b) extending into the opening (3) having a circular cross section so as to define an adjusted cross section area between the projecting member (4) and the opening (3), the cooling flow (F) being able to flow through the adjusted cross section area.

The invention provides a pipe preparation method. The pipe preparation method comprises the following steps that at least one of an original pipe and a mold is selected according to a target pipe; the two end sections of the original pipe are locally heated, the two end sections of the original pipe are stretched in the axial direction of the original pipe, the diameters of the two end sections of the original pipe are reduced, the diameter of the central section L of the original pipe is kept unchanged, and therefore a material blank is obtained; the material blank is placed in an inner cavity of a mold, the central section L of the material blank is stretched in the axial direction of the material blank, the diameter of the central section L of the material blank is reduced, the central section L of the material blank is attached to the wall of the inner cavity of the mold, and therefore a formed pipe is obtained; and keeping the temperature and pressure of the formed pipe, and cooling to obtain the target pipe. According to the method, preparation of the ultrathin small-diameter pipe is achieved, the outer diameter of the pipe can be controlled to be smaller than 0.8 mm, and the double-wall thickness is controlled to be smaller than 30 microns.

The explosion-proof permanent magnet motor comprises a motor body, a liquid cooling pipeline is arranged in the motor body, a supporting frame is fixedly connected to the top end of the motor body, and a circulating water pump is fixedly installed at the top end of the supporting frame; a water outlet and a water inlet of the circulating water pump communicate with a liquid conveying pipe and a liquid return pipe correspondingly, the liquid inlet end of the liquid cooling pipeline communicates with a liquid injection pipe, and a double-wall guiding and dispersing assembly is arranged between the liquid conveying pipe and the liquid injection pipe; according to the invention, through the double-cylinder interlayer design of the double-wall dispersion assembly, a double-wall flow guide path can be formed when the cooling liquid circularly flows, so that the temperature of the cooling liquid can be efficiently reduced without air cooling assistance, and the explosion-proof risk caused by overtemperature of the surface of the motor is avoided; and compared with the design that an air cooling auxiliary mechanism is adopted for cooling the cooling liquid in the prior art, the structure is simple, maintenance is convenient, and the problem that corrosion of the high-salt-fog environment of the ship to the motor is aggravated can be effectively solved.

The invention discloses a thermoelectric power generation double-wall pipe for an LNG ship, and particularly relates to the field of LNG transport ships. Comprising a first pipeline and a second pipeline, an elastic supporting mechanism is arranged between the first pipeline and the second pipeline; a thermoelectric power generation sheet and a leakage detection mechanism are arranged at one end, close to the second pipeline, of the elastic supporting mechanism; the cold end of the thermoelectric power generation piece makes contact with the second pipeline, an electrode of the thermoelectric power generation piece is connected with a power source, the power source is connected with a leakage detection mechanism, and the leakage detection mechanism is used for conducting leakage monitoring on gas in the second pipeline. Based on the device, the cold end of the thermoelectric power generation sheet is in contact with the side wall of the second pipeline close to the transportation gas, the temperature difference between the cold end and the hot end is subjected to electric energy conversion, power is supplied to the leakage detection mechanism, and waste cold is utilized; and real-time leakage detection of the pipeline can be realized without the help of an external power supply.

The utility model provides a double-wall jacketed pressure vessel, which relates to the technical field of dispensing machines, and comprises a vessel body, the upper surface of the vessel body is fixedly connected with a feed pipe, the bottom of the vessel body is fixedly connected with a discharge pipe, the arc surface of the vessel body is provided with a cavity, and the discharge pipe is fixedly connected with the discharge pipe. The arc surface of the container body is fixedly connected with an air inlet pipe and an air outlet pipe, the air inlet pipe and the air outlet pipe are communicated with the cavity, a supporting device is arranged at the position, corresponding to the air inlet pipe, of the arc surface of the container body, the supporting device comprises a supporting plate, and the supporting plate is fixedly connected to the arc surface of the container body; according to the air inlet pipe supporting device, the effect of supporting a pipeline connected with the air inlet pipe is achieved through the supporting device, and the situation that the pipeline is separated from the air inlet pipe under the action of the gravity of the pipeline is avoided.

The present invention relates to a plate heat exchanger comprising a stack of plate elements, each plate element being a double-walled structure comprising a first heat transfer plate and a second heat transfer plate, each heat transfer plate comprising a central heat exchange section provided with a surface pattern adapted to have the surface pattern of the first heat transfer plate of one plate element contact the surface pattern of the second heat transfer plate of an adjacent plate element, thereby forming a first flow path for a first fluid on one side of the plate element and a second flow path for a second fluid on a second side of the plate element, wherein the plate elements are formed with openings in an opening area, wherein the first heat transfer plate in the opening area is formed with a closed protrusion protruding in a first direction and in the same opening area is formed with an open protrusion, the open protrusion being formed in a second direction opposite to the first direction, such that the closed protrusion and the open protrusion together define a first leakage cavity.

Device for producing a double-walled tube from a sheet (2) comprising: at least one first pair of profile rolls (4a, 4b, 5a, 5b) for producing a Z-profile with a middle leg having a length and two outer legs in the sheet (2), wherein a pair of profile rolls (4a, 4b, 5a, 5b) has an upper profile roll (4a, 5a) and an opposing lower profile roll (4b, 5b), and at least one bending upper roll (7a) and one bending lower roll (8b) for producing a circular bend in the sheet (2), wherein the bending upper roll (7a) and the bending lower roll (8b) are arranged to simultaneously produce a helix in the sheet (2), such that adjacent turns of the helix partially overlap, a device for connecting a first passage of the helix with an adjacent second passage of the helix wherein the middle leg of the Z-profile has a length such that the overlapping outer legs of the Z-profile are spaced apart from each other in the direction of the diameter of the helix when they are coiled into a helix and rounded.

The invention relates to a double-walled tube (10) for conveying high-pressure fuel, comprising a first tube (402) forming a fluid flow channel (404) within the first tube and a second tube (406) arranged coaxially around the first tube, in which the double-walled tube (10) comprises at least two rings of the double-walled tube (10) around an axis and the double-walled tube (10) comprises a variable pitch.