93 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 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.

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 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.

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 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.

An exhaust gas heat recovery device (1) is provided with: a first flow path member (10) having a first flow path through which exhaust gas flows; a second flow path member (20) that is adjacent to the first flow path member (10), has a heat exchange unit (30), and has a second flow path; and a valve mechanism (40) that opens and closes the first flow path and blocks or blocks the flow of the exhaust gas from the second flow path, and the first flow path member (10) is provided with a double-wall section (19) having an inner wall section (17) facing the first flow path and an outer wall section (18) positioned on the opposite side of the first flow path on at least a part of the upstream side in the flow direction of the exhaust gas from the valve mechanism (40).

The present application relates to a method for installing a fuel tank top deck section and double-wall pipes of a dual-fuel container ship, which divides the deck section into a deck assembly, an A-zone longitudinal bulkhead assembly, a B-zone longitudinal bulkhead assembly and a C-zone longitudinal bulkhead assembly; the deck assembly and the C-zone longitudinal bulkhead assembly are separately built, the A-zone longitudinal bulkhead assembly is integrally built when the deck assembly is built; the B-zone longitudinal bulkhead assembly is separately built; sand-blasting and painting are performed; the deck assembly is reversely placed and the B-zone longitudinal bulkhead assembly is separately installed; four longitudinal bulkhead plates of the B-zone longitudinal bulkhead assembly are separately installed on the deck assembly, double-wall pipes are passed through the four longitudinal bulkhead plates of the B-zone longitudinal bulkhead assembly, and the rib plates between the four longitudinal bulkhead plates are installed; and the C-zone longitudinal bulkhead assembly is mounted on the B-zone longitudinal bulkhead assembly. The present application divides the deck section into different assemblies for building, installs the double-wall pipes and mounts the assemblies after sand-blasting and painting, so as to avoid damaging the double-wall pipes.

The utility model relates to a coating type cylinder cover air inlet channel methanol injection system, which relates to the field of ship engineering and power systems and comprises a cylinder cover, a coating type adapter block obliquely arranged at one end of the top of the cylinder cover, a pressing block obliquely arranged at the top of the coating type adapter block and double-wall pipes transversely arranged on two sides of the pressing block. The top of the alcohol sprayer is wrapped in the wrapping type adapter block, and the bottom of the alcohol sprayer penetrates through the top of the cylinder cover. By means of the innovative wrapping type design and the double-wall pipe structure, the leakproofness and safety of the system are improved, and methanol leakage is effectively prevented.

The invention relates to the technical field of geological exploration equipment, and discloses a kilometer-level multifunctional multi-process reverse circulation power head and a drilling method, the drilling depth of the kilometer-level multifunctional multi-process reverse circulation power head reaches the kilometer level, and the drilling torque and the lifting force are the maximum at home and abroad. Comprising a box body which is internally provided with a speed change structure, an input end and an output end. The speed changing structure is connected with the motor set, and gear shifting switching is executed through the hydraulic motor. The upper end of the box body is connected with an output end structure, and the lower end is connected with a hydraulic motor and an input end structure. The input end structure is provided with an air inlet pipeline, an air ball valve, a back flushing connector, an air box and a slurry inlet. The output end structure is provided with a slurry cooling pipeline and a rock debris discharging pipeline. A control system comprising a data acquisition module, a logic matching module and an action execution module is used for acquiring geological parameters in a hole in real time and automatically regulating and controlling mechanical actions of a bottom layer, and a hydraulic motor is used for driving a gear shifting shaft and a gear shifting connecting rod; and the first driving gear is shifted to slide to a preset final position along the input shaft to complete separation or physical engagement with the driven gear, so that the power requirements of different processes on the rotating speed and the torque are met, and switching of different functions is realized. The action execution module gives a back flushing instruction to switch the air ball valve to guide air to enter the middle pipeline of the double-wall drill rod and the bottom channel of the drill bit to be discharged outwards to clean blockage of the middle channel of the drill rod and blockage in a hole. Slurry flows through a cooling pipeline in the box body to complete heat exchange of the power head box body and flows into a drill hole, cooling of the power head is completed, and the slurry circulation process requirement is met. By switching inlet ends and outlet ends of different pipelines, switching among three drilling processes of air reverse circulation, gas lift reverse circulation drilling and wire line coring drilling is achieved, and different geological requirements are met.

The utility model discloses a stainless steel double-wall pipe machining tool, which relates to the field of stainless steel double-wall pipe machining and comprises a fixing seat, a workbench is fixedly mounted at the upper end of the fixing seat, a driving motor is fixedly mounted in the fixing seat, and a pushing air cylinder is fixedly mounted on an output shaft of the driving motor. The pushing air cylinder rotates in the workbench, a supporting plate is slidably installed in the upper end of the workbench, fixing rods are fixedly installed on the two sides of the end, away from the workbench, of the supporting plate, and lower semicircular covers are integrally formed at the ends, away from the supporting plate, of the two fixing rods. An upper semicircular cover is hinged to the sides of the ends, away from the fixing rod, of the two lower semicircular covers, and the side, away from the hinged position of the lower semicircular covers, of the upper semicircular cover is installed at the upper ends of the lower semicircular covers in a clamped mode. By the adoption of the structure, angle adjustment of the double-wall pipe in the machining process is achieved, and different machining requirements are met.

A planetary transmission includes first and second planetary stages. At least one of the first and second planetary stages includes a transmission component. The planetary transmission further includes a pilot bearing, and a double-walled pipe received in the pilot bearing and having a central portion designed to have an outlet point for dispensing lubricant into the transmission component. A bushing is disposed in a region of the outlet point such that a gap is formed between the bushing and the transmission component.

The invention discloses an anti-fouling cleaning device and method for the interior of a high-vacuum heat-insulation double-wall pipe, and the device comprises a double-wall inner pipe, and further comprises a driving unit which is arranged at the side part of the double-wall inner pipe; and the antifouling unit is movably arranged in the double-wall inner pipe. Through downward movement of a moving rod, an upper sealing plate and a sealing plate can be pulled to move downwards, the upper sealing plate can make contact with a top ring plate for sealing, after an arc washboard is recycled into an equipment cavity, the sealing plate and an extension plate seal a butt joint ring plate, a connecting pipe and a butt joint opening are in butt joint, and therefore the sealing performance of the upper space and the lower space of a welding seam is improved; and after the upper part and the lower part of the welding seam are sealed, the passivation part discharges the passivation solution to the top of the sealing plate through the connecting pipe, so that the welding seam is soaked in the passivation solution, the welding seam on the inner wall of the double-wall inner pipe is subjected to passivation antifouling treatment, the use amount of the passivation solution is reduced, and the antifouling cleaning effect of the interior of the double-wall pipe is improved.

Reactor for the deposition of silicon from a process gas, comprising a double-walled reactor bell (12) made of stainless steel mounted on a base plate (48), the bell having an outer wall (16) and an inner wall (18) forming an intermediate space (20) supplied with cooling medium, wherein current-carrying support rods (30) for the crystallization of pure silicon from the vapor phase are mounted on the base plate (48) within a process chamber (28) enclosed by the reactor bell (12), characterized in that a double-walled inner cylinder (32) is arranged in the process chamber (28) at a distance (42) from the inner wall (18) of the reactor bell (12) and at a distance above the base plate (48), the annular space of which within the double wall of the inner cylinder (32) is supplied with a cooling medium and the inner surface of which, facing into the process chamber (28), bears an inert coating (34) which preferably consists of silver.

A kind of methanol dual-fuel generator return pipeline double-wall pipe annular area leak-proof safety system, including pressure reducing valve, manual stop valve, bleeder module, stop check valve, methanol dual-fuel generator, stop check valve, bleeder valve, safety valve, manual stop valve, balance valve, terminal bleeder valve.The pressure reducing valve is used to reduce 13bar nitrogen to 2bar, make 2bar nitrogen fill annular area, the bleeder module is used to connect the connection between annular area and double-wall pipe inner tube.Manual stop valve is used to manually purge the methanol leaked in annular area, terminal bleeder valve is used to access the methanol liquid remaining in annular area into portable bleeder tank.The present application can quickly solve the problem of methanol generator double-wall pipe annular area leak in safety area, adopt closed measures to remove methanol in annular area, realize quickly emptying methanol in annular area, with simple design, easy operation, safety explosion-proof characteristics.

The invention discloses a friction loss pressure calculation model in the drilling process of gas lift circulation well drilling. The friction loss pressure calculation model comprises the following steps that S1, hydrostatic pressure of the bottom of an inner pipe of a double-wall drill rod is calculated; s2, calculating the friction loss pressure of compressed air of an outer annulus of the double-wall drill rod; s3, calculating the friction loss pressure of the compressed air flowing through the earth surface gas transmission channel; s4, calculating the local pressure loss of the compressed air passing through the orifice in the gas-liquid mixer from the outer pipe of the double-wall drill rod; s5, calculating the liquid phase flow friction pressure loss of the inner pipe of the double-wall drill pipe; s6, calculating the liquid-phase flow friction pressure loss of the deslagging pipeline; s7, calculating the three-phase flow pressure drop of the inner pipe of the double-wall drill pipe; and S8, the starting pressure and the circulating air supply pressure are calculated. According to the friction loss pressure calculation model in the drilling process of the gas lift circulation drilling, the starting pressure and the circulation gas supply pressure of the gas lift reverse circulation drilling can be accurately and conveniently calculated by accurately calculating the pressure of each part of the gas lift reverse circulation drilling process, and a theoretical basis is provided for stable and efficient operation of a circulation system.