197results about How to "Guaranteed watertightness" patented technology

The invention discloses a glass fiber reinforced nylon colored insulated strip used for an aluminum alloy door and window. The compositions by weight portion of the glass fiber reinforced nylon colored insulated strip are: 100 portions of nylon resin, 5 to 50 portions of glass fibers, 0 to 50 portions of inorganic filler, 5 to 25 portions of toughening agent, 0.3 to 5 portions of coupling agent, 0.3 to 5 portions of dispersing lubricant, 0.2 to 5 portions of antioxidant, 0.1 to 1 portion of light stabilizer, 0.1 to 1 portion of heat stabilizer and 2 to 10 portions of colored masterbatch. The invention also discloses a method for preparing the colored insulated strip. The glass fiber reinforced nylon colored insulated strip solves the problems that the masterbatch and the filler are difficult to disperse and nylon 66 is easy to change color during the processing procedure; the insulated strip products have various colors, superior performance and beautiful appearance; and the glass fiber reinforced nylon colored insulated strip realizes perfect matching with the window color, can achieve the beautility effect, meets and enlarges the demand of clients and the market, and is favorable for promotion, use and development of the glass fiber reinforced nylon 66 insulated strip.

The invention discloses a layered shear model box for a centrifuge shaking table test. The shear box is formed by sequentially overlapping a first layer to a twelfth layer of equal-thickness hollow rectangular aluminum alloy shear frames from top to bottom, eleven upper layers are movable layers, the lowest layer is a fixed layer fixed onto a gland plate connected with a bottom plate, rolling grooves are arranged among the layers in the length direction, rolling shafts are placed in each rolling groove, horizontal displacement sensors mounted on displacement sensor clamps are arranged on two sides of each of the eleven upper layers in the length direction, metal steel sheets are mounted on two sides of each of the eleven upper layers in the width direction, a rubber washer is arranged between the gland plate and the bottom plate, a rubber membrane is mounted on the inner side of the shear box, the bottom end of the rubber membrane is connected with the washer inlaid between the lowest layer of shear frame and the bottom plate, a drainage system is arranged in the bottom plate of the shear box, and the bottom plate is fixed onto a shaking table in the test. The layered shear model box is capable of simulating the action of soil bodies on a semi-infinite site through a model of a finite size, and is light in weight, simple in structure and convenient in installation and application.

An electronic fever thermometer includes a housing made of a transparent material, for example, transparent plastic. The housing includes a temperature sensor to measure the temperature, and a display element to display the measured temperature. The housing has a treated outer and / or inner surface so that the housing is essentially nontransparent to visible light. The housing also has an untreated viewing area. The display element is arranged within the housing adjacent to the viewing area.

The invention discloses a laminar shear box device for a supergravity-field vibration table test. A main body is a shear box formed by laminating 20 layers of rectangular aluminum alloy frames of equal thicknesses; the layers are connected with one another through a rolling shaft; horizontal displacement sensors are arranged on the upper 19 layers through bolts; the periphery of a shear frame is provided with a rigid support frame, which comprises a displacement sensor fixture, a guide post and a static post; the guide post and a top plate are provided with frame guide wheels; a rubber film is arranged on the inner side of the shear box; a drainage system is arranged in a bottom plate of the shear box; and the bottom plate is fixed on a vibration table during testing. In the invention, the behavior of a semi-infinite site soil body can be simulated through a model of a definite size. The laminar shear box device has the characteristics of simple structure and convenience for installing and applying.

Provided is an integrated ventilation type unit curtain wall. The problems that in the existing curtain wall ventilation, the irregular ventilation generates the waste of energy consumption, a ventilator is independently arranged on a unit plate block, and the outer decoration effect of a curtain wall is influenced are solved. The integrated ventilation type unit curtain wall comprises a unit plate block formed by glass plane materials and outer pinch plates assembled with a male vertical keel and a female vertical keel and a ventilator, and is characterized in that the ventilator is integrated in the wide-body female vertical keel cavity of the unit plate block, a rotating core body with a cross-flow fan and double guide vanes is arranged between two end plates of a ventilator shell body, the rotating core body is driven by a stepping motor, the blocking positions of the double guide vanes in the rotating core body are controlled, and the air input, air exhaust and closing of a ventilator air channel are achieved. The integrated ventilation type unit curtain wall is reasonable in design of the integrated type structure and convenient to mount, dismount and maintain, the water tightness and the air impermeability of the curtain wall unit plate block are guaranteed, meanwhile, the uniformity of the outer decoration effect is enhanced, the ventilation state is precisely controlled, the requirement for air quality in different periods is met, and the aim of saving energy is achieved.

The invention relates to an arc surface unit type curtain wall construction method and structure. The arc surface unit type curtain wall construction method includes the following steps: a. determining axis reference point arrangement and controlling a network mode according to engineering structure characteristics to conduct measurement and setting out and determining the position of post-arranged embedded parts; b. processing and manufacturing arc surface unit plates and installing aluminum alloy vertical frames and aluminum alloy transverse frames on the periphery of the arc surface unit plates; c. installing adaptation connection pieces according to the positions of the located post-arranged embedded parts and installing and fixing the arc surface unit plates through the adaptation connection pieces. By means of the method and structure, the aluminum alloy vertical frames are arranged to be combined sections with certain angles, and adjusting and locating time in the installation process is greatly saved. The post-arranged embedded parts adopt the exposed grooved design, double-tying-point connection is adopted, three-dimensional adjustment is conducted on the adaptation connection pieces and unit bodies in the construction process through bolts, and the deviation is controlled in an allowable range to ensure curve surface smoothness.

The invention discloses a detachable combined type ship and a hull module connecting way thereof. The detachable combined type ship comprises two large modules and six detachable modules; the two large modules consist of a steering room and working instrument operating room module and an air compressor and container module and are positioned above a main deck; and the six detachable modules consist of a head left living water supplying and draining system module, a right living lodging quarter module, a middle left main generator, distribution panel, fire pump and air compressor auxiliary equipment module, a right main generator, distribution panel, fire pump and air compressor auxiliary equipment module, a tail left host gear box, tail shaft, airscrew propulsion system and rudder system module, and a right host gear box, tail shaft, airscrew propulsion system and rudder system module and are positioned below the main deck. For the detachable combined type ship and the hull module connecting way thereof, the purpose of the disassembly of the detachable combined type ship is to be convenient for transportation so that the detachable combined type ship is transferred to a next production base conveniently after the work of one base is completed; the purpose of the combination of the detachable combined type ship is to recover the functions of the whole ship; therefore, one ship is used for a plurality of times at multiple positions; the whole production cost is decreased; and the availability factor of equipment is improved.

The invention relates to the construction and manufacturing field of seabed immersed tunnels, in particular to a dock gate caisson structure capable of achieving two-way water stop. The dock gate caisson structure comprises a dock gate caisson, a dock gate base plate, dock blocks, first preformed grooves, second preformed grooves, a water stop steel plate, a small steel gate and water stop belts. The dock gate caisson is arranged between the dock blocks and located on the dock gate base plate. The matched faces between the two sides of the dock gate caisson and the dock blocks are provided with the corresponding first preformed grooves respectively, the dry dock side of the dock gate caisson is provided with a dock opening, the portion, at the dock opening, of the dock gate base plate is provided with the second preformed grooves, the water stop steel plate is matched with the two corresponding first preformed grooves, the small steel gate is matched with the second preformed grooves, and the small steel gate and the dock gate base plate are provided with the water stop belts respectively. The dock gate caisson structure is simple, easy to operate, good in sealing and water stop effect, and capable of achieving the two-way water stop purpose that water inflowing is prevented during dry dock construction and water outflowing is prevented during dry dock water storage on the same site.

The invention relates to an electric window opening and locking system, comprising a window locking device, a link mechanism and a screw connected to a motor; the screw is sleeved with a nut having a shift rod, a rail slider of the link mechanism has a first notch, a rail of the link mechanism is provided with a special-shaped guide slot including a first flat segment, a second flat segment and a transition segment, a trajectory of the first gap overlaps with the first flat segment when the rail slider slides along the rail, the second flat segment is parallel to or collinear with the first flat segment, the window locking device comprises a clamp and a drive mechanism connected with each other, the clamp is provided with a second notch, the shift rod passes through the special-shaped guide slot, enters the first notch when moving to the first flat segment to push the rail slider to move, enters the second notch when moving to the second flat segment to push the clamp in motion, and leaves the corresponding notch when moving from the first flat segment or the second flat segment to the transition segment.

The invention relates to an underwater sealing wall penetrating structure. A flange plate at one end of a wall penetrating sleeve is in sealed connection with an underwater sealing cabin, a sealing plug connected with the inner wall of the wall penetrating sleeve in a sealed abutting manner is contained in the end, and the end is in threaded connection with a sealing screw sleeve. The other end ofthe wall penetrating sleeve is in threaded connection with a pressing screw sleeve. One end of the pressing screw sleeve is inserted into the wall penetrating sleeve and is connected with the inner wall of the wall penetrating sleeve in a sealed abutting manner, the other end of the pressing screw sleeve is located outside the wall penetrating sleeve, a sealing plug is contained in the other endof the pressing screw sleeve, and the other end of the pressing screw sleeve is in threaded connection with a sealing screw sleeve. A pressing wedge is contained in the wall penetrating sleeve and located between the pressing screw sleeve and the sealing plug contained in one end of the wall penetrating sleeve. An underwater photoelectric composite cable sequentially penetrates one sealing screw sleeve, one sealing plug, the pressing screw sleeve and the pressing wedge. The outer surface of the pressing wedge is connected with the inner wall of the wall penetrating sleeve in an abutting manner, and the inner surface of the pressing wedge is of a tooth structure achieving axial fixing with the underwater photoelectric composite cable. The underwater sealing wall penetrating structure does not depend on vulcanization sealing, watertightness inside and outside the cabin is guaranteed in a mechanical sealing manner, and mounting and separating of the photoelectric composite cable and the cabin can be conveniently achieved.

This waterproof slide fastener (1, 2, 3, 4) is configured so that first and second through-holes (14a, 14b) are formed at specific intervals in tape side edges of waterproof tapes (11), and so that first and second halves (15, 16) of fastener elements (12) are connected and integrated together through the first through-holes (14a). A stopper (20, 30, 40, 50, 60) has a body section (21, 31, 41, 51, 61) and an extension section (22, 32, 42, 52, 62) which extends from the body section (21, 31, 41, 51, 61). First and second halves (23, 24) of the stopper (20, 30, 40, 50, 60) are disposed so as to straddle the pair of waterproof tapes (11) and are connected and integrated together through the second through-holes (14b). As a result of this configuration, the manufacturing step of the waterproof slide fastener (1, 2, 3, 4) is simplified, and water is prevented from entering even if the slide fastener (1, 2, 3, 4) is subjected to a lateral pulling force.

The invention discloses a three liquid vacuum cleaner which comprises an overall liquid groove, a cleaning chamber and a spraying system. The spraying system is communicated with the overall liquid groove through a spraying tube, a return pipe is arranged between the cleaning chamber and the overall liquid groove, and the cleaning chamber and the overall liquid groove are communicated by the return pipe. A chamber door is arranged on the cleaning chamber and a material-placing table is arranged inside the cleaning chamber. The overall liquid groove is divided into a low concentration cleaning liquid groove, a clean water groove and a high concentration cleaning liquid groove. The low concentration cleaning liquid groove, the clean water groove and the high concentration cleaning liquid groove are respectively communicated with the spraying system through a spraying tube. A suction port of a vacuum pump is communicated with the inner part of the cleaning chamber through a vacuumizing pipeline. When the chamber door closes, the cleaning chamber is sealed. Due to the three liquid vacuum cleaner, vacuumizing cleaning and solvent-type cleaning are combined organically to achieve the best cleaning and drying purposese. The three liquid vacuum cleaner is simple in structure, convenient to operate, process-simplifying, strong in cleaning capability, high in controlling accuracy, clean and environmental-friendly.

The invention provides a pressure storage and water drainage structure of an aluminium window. An inner water storage cavity and an outer water storage cavity which have high-water level water storage functions are respectively formed along two side tracks on a lower beam of a bidirectional horizontal pull-type aluminium window, water guide holes are formed in different positions in the inner water storage cavity and the outer water storage cavity, rainwater which is permeateding into the water storage cavities or inner channels areis guided into a water drainage cavity below the outer part of an aluminium window chamber through the water guide holes, and the indoor and outdoor pressure balancing principle is utilized to discharge the rainwater out of the chamber; and the design and formed staggering water drainage channels are utilized, the higher outdoor wind pressure can be born except the indoor wind pressure can be relieved, and furthermore, the high water tightness and resistance to long-time high wind pressure can be realized. In addition, separating type tracks are utilized to be combined above the water storage cavities, the aluminium window can be conveniently extruded and processed, the damage during the installation and construction of the aluminium window can be avoided, and replace of users can be facilitatedconveniently change.

The invention relates to the field of marine science observation and research, and particularly relates to a wave power generation device and a complementary combined power supply device for an oceandata buoy. The wave power generation device is arranged in a buoy body, and comprises a permanent magnet group, a coil, a storage battery and a rectifying voltage stabilizer, wherein the coil is arranged in a magnetic field of the permanent magnet group, the upper end of the coil is hinged to a fixed object, and the lower end of the coil is a free end; electrodes at the two ends of the coil are connected with the rectifying voltage stabilizer through conductive wires; the rectifying voltage stabilizer is connected with the storage battery through a conductive wire; the coil swings around a hinged fulcrum along with the swinging of the buoy body, and continuously cuts a magnetic induction line, so that voltages are generated at the two ends of the coil; and then a stable direct current is generated through the rectifying voltage stabilizer and input into the storage battery. According to the complementary combined power supply device, the form of complementary combined power supply is formed through the wave power generation device and a solar panel, and complementary combined power supply can be carried out on the buoy in the cases of calm sea and roaring waves, so that adequate energy supply for the buoy, and stable and reliable running are ensured.

This invention relates to an outlet switch device of a multifunction flower watering, which is installed on the outlet body matched with a hydraulic pressure control valve, the switch base covers the body having a pipe and a containing cavity with an intake, outlet and a tilted port, the top cover covers the intake and connected with the intake pipe, a guide rod limit is plugged in the pipe, a reset spring is set between the end cover and the guide rod, the internal end of the rod is sealed by a sealing sleeve to be fixed on a stopper, which moves along with the rod to make its bottom to open the tilted port or the outlet by strong water pressure and the reset spring, an impeller is set under the switch base and fixed on a first level transmission shaft of the gear set, the vane is just opposite to the tilted port, a grooved pulley and a turnplate are fixed on a same shaft and matched with a dial on the last level drive shaft, through holes are set corresponding to function outlet holes on the turnplate, which turns to let the through hole conduct to one of the function holes.

The invention discloses a sandwich composite pressure-resistant shell used for a submersible and belongs to the field of pressure-resistant shells of submersibles. The sandwich composite pressure-resistant shell comprises a plurality of annular cabin sections, a plurality of pressure-resistant ring ribs and a plurality of sealing parts. Each cabin section comprises an inner shell, an outer shell and a sandwich layer arranged between the inner shell and the outer shell. The end openings of the two ends of each cabin section are in a groove shape, and the outer shell and the inner shell of each cabin section are connected into a whole in the positions of the end openings. Each pressure-resistant ring rib is in a disc shape integrally and comprises a ring wall arranged on the periphery and rib walls which are also arranged on the periphery and are perpendicular to the ring wall. Each ring wall is pasted in the position of the corresponding end opening, and each rib wall is pasted to the inner shell in the position of the corresponding end opening. Disc parts of the pressure-resistant ring ribs in the positions of the end openings of each cabin section are closely attached to each other and fixed to each other so that the cabin sections can be connected into a whole. Each sealing part is arranged in an annular groove formed after the two corresponding groove-shaped end openings are in butt joint, the middle of each sealing part is thick, and the two sides of the sealing part are thin. The sealing parts are used for connecting the cabin sections, so that the outer wall of the multiple connected cabin sections is flat. Connection at the end openings of the pressure-resistant shell is firm and stable, and the water tightness is good.

Provided is a built-in sunshade cloth curtain of hollow glass. The shortcomings that in the prior art of building windows and doors and glass curtain walls, a sunshade cloth curtain is hung out of glass and is bad in sunshade effect are overcome. The built-in sunshade cloth curtain of the hollow glass comprises the hollow glass, the sunshade cloth curtain and a sunshade cloth curtain control mechanism which comprises a sealing shell body, a support, sealing partition plates, magnetic blocks, a connecting rod, a controller and a sunshade cloth curtain coiling drum. One end of the controller is connected with the support. The other end of the controller is fixed with a magnetic block 11-1. One end of the sunshade cloth curtain coiling drum is fixed with a magnetic block 11-2. The other end of the sunshade cloth curtain coiling drum is fixed with the support. The sealing partition plate and a sealing support inner wall are bonded in a sealing mode. The magnetic block 11-1 and the magnetic block 11-2 are arranged on two sides of a sealing partition plate 12-1 and attract each other in a magnetic mode. A sealing partition plate 12-2 is placed on the outer side of the support 7-3. One end of the sunshade cloth curtain is fixed with the sunshade cloth curtain coiling drum, and the other end of the sunshade cloth curtain is hung in the hollow glass. The built-in sunshade cloth curtain of the hollow glass has good heat insulation effect and is suitable for all kinds of building window and door glass.

The invention discloses a standardized unit fabricated composite wall. The standardized unit fabricated composite wall comprises an outer wall surface, frameworks and an inner wall surface. The outer wall surface comprises an outer wall facing layer, an outer wall reflective thermal insulation film and a one-way breathing damp-proof layer, the inner wall surface comprises an inner wall sound absorbing layer and an inner wall facing layer, and the outer wall facing layer is manufactured by adopting a PVDF profiled steel sheet; and the positions among the frameworks are filled with rock wool, the frame overlapping parts of the frameworks adopt first tongue-and-groove type purlines and second tongue-and-groove type purlines, and the inner wall facing layer, the inner wall sound absorbing layer, the frameworks, the outer wall reflective thermal insulation film, the one-way breathing damp-proof layer and the outer wall facing layer are sequentially arranged from inside to outside. According to the standardized unit fabricated composite wall, materials with the characteristics of thermal insulation, fireproofness, dampproofness, sound insulation, attractiveness and the like are made to be a unit fabricated composite wallboard, the wind resistance performance, the airtight performance, the watertight performance and the in-plane deformation performance of a wall surface system are guaranteed, standardized prefabrication, unit-type forming, integrated transportation and fabricated installation are further achieved, and the standardized unit fabricated composite wall can be applied to wall systems in the field of steel structure houses.

The invention provides a detachable watertight fireproof and heat insulation cabin penetration part which comprises a connecting flange A, a cylinder, a fixed seat plate, sleeves, a positioning fastener and a top plate. The connecting flange A is welded and mounted at one end of the cylinder, a connecting flange B is welded and mounted at the other end of the cylinder, a mounting footing is weldedand fixed to the middle position of the cylinder, the mounting footing is provided with a fireproof and heat insulation gasket and the fixed seat plate successively through a fixed bolt and a screw,the sleeves are fixed to two sides of the mounting footing, and an overhaul cover plate is hermetically mounted on the sides, far away from the mounting footing, of the sleeves through the positioningfastener and a fixed part. According to the detachable watertight fireproof and heat insulation cabin penetration part, heat can be prevented from being conducted to the fixed seat plate and a cabinwall of a ship through the fireproof and heat insulation gasket made from a material with low heat conductivity coefficient, so that a heat insulation effect is exerted, and deformation of the cabin wall of the ship due to high temperature is prevented.

The invention discloses a plastic multi cable transit. The plastic multi cable transit comprises a fixed seat and a through pipe, wherein the fixed seat is fixed on a bulkhead of a ship in a water-tight mode, a through hole, corresponding to a mounting hole in the bulkhead, is correspondingly formed in the fixed seat, the through pipe penetrates in the through hole, the through pipe is detachablyand hermetically connected with the fixed seat, and the two ends of the through pipe are connected with a pipeline of the ship. The fixed seat is fixedly arranged at the bulkhead in the water-tight mode, then the through pipe penetrates in the through hole in the fixed seat, the water tightness between two adjacent cabins is guaranteed through sealing connection between the through hole and the through pipe, and the problem that the water tightness cannot be ensured due to the fact that the through pipe and the bulkhead cannot be welded and connected is solved. Meanwhile, according to the plastic multi cable transit, due to the fact that the multi cable transit comprises two detachable parts, the through pipe can be conveniently disassembled during installation and repair and maintenance,and the problem that a steel through piece is inconvenient to disassemble and replace in an existing scheme is solved.

The invention discloses an interlocking type water guide disk set which comprises a plurality of water guide disks and a plurality of water sealing assemblies, wherein the water guide disks are rotationally and mutually superimposed; each water guide disk comprises a disk-shaped body, a through hole running through the body along the axial direction, a plurality of annular holes disposed around the axial direction on the annular wall surface of the through holes, a plurality of locking parts which outwards extend from the disk surface at one side of the body and correspond to one end of each annular hole, a plurality of folding parts extending into the annular holes from the disk surface at the other side of the body and a positioning part which surrounds the annular holes and is inwards sunk respectively from the disk surfaces at two sides of the body; the positioning part is provided with at least one connecting hole running through the disk surfaces at two sides of the body; the water sealing assemblies are respectively and fixedly arranged on the positioning part on the water guide disk; and each water sealing assembly comprises two butting parts corresponding to the disk surfaces at two sides of the body and at least one guiding part which is arranged between the two butting parts and extends in the connecting hole. The set is more convenient to assembly and can be used for maintaining good water sealing effect between the water guide disk and a filter film.

The invention provides a dynamic sealing device for a long-endurance watertight counter rotating motor, which belongs to the technical field of mechanical seal. The technical scheme includes that an outer shaft sealing seat (5) is fixedly connected onto the motor, and an outer shaft (11) is sealed by two internal 45-degree mold splitting outer shaft O-shaped rings (13); an inner shaft sealing seat (4) is fixedly connected to the inner diameter of the front end of the outer shaft (11) via an outer shaft gland (3), and an inner shaft (12) is sealed by an internal 45-degree mold splitting front O-shaped ring (7) and an internal 45-degree mold splitting rear O-shaped ring (8) with the diameter larger than that of the front O-shaped ring (7); an inner shaft oil plug (1) is arranged at the front end of the inner shaft, when a lubricating oil cavity (10) is vacuumized and lubricating oil is injected into the lubricating oil cavity (10), the inner shaft oil plug (1) is drawn outwards, and the lubricating oil cavity (10) is communicated with the outside via an oil injection hole (6); and after the lubricating oil cavity (10) is filled with the lubricating oil, the inner shaft oil plug (1) is pushed inwards, and is fixed at the front end of the inner shaft via an inner shaft gland (2). The dynamic sealing device is applicable to sealing a shaft outlet position of the watertight motor, and realizes dynamic sealing of the long-endurance watertight counter rotating motor.

The invention discloses a water stop structure of a movable working gate and a sealing device. The water stop structure comprises a U-shaped body, wherein cavity plugs are arranged at two ends of the U-shaped body; a seat plate is connected with a gate panel; the sealing device is fixedly mounted on the seat plate through an inner pressing plate and an outer pressing plate; a pressurizing chamber is formed between an air seal piece in the sealing device and the seat plate; an air inlet hole and an air outlet hole communicated with the pressurizing chamber are formed in the seat plate; a water seal head which comes into contact with or is separated from a gate groove water stop dual-face under the driving of the air seal piece is further arranged in the sealing device; the air inlet hole is connected with an air compressor. Compared with the prior art, the water stop structure of the movable working gate and the sealing device have the beneficial effects that a water seal device is used in a U-shaped form so as to be applicable to a surface-hole gate having only three water stop dual-faces (namely the dual-face is not arranged in the horizontal direction on the gate). Due to the adoption of a split sealing device structure and due to the hardness difference, the technical problem that a pressurized type water seal is likely to damage in the prior art is solved.

The invention belongs to the field of underwater instruments and devices, and particularly relates to an underwater cable junction box for collecting underwater cables. The underwater cable junction box comprises a sealed housing, cable watertight plugs and a cable junction board, wherein two end surfaces of the sealed housing are respectively provided with the plurality of cable watertight plugs in a sealed mode; one of the cable watertight plugs on each end surface is a plug of a junction cable outlet, and the other plugs are plugs of inlet cables; the cable junction board is installed in the sealed housing; and a plurality of cables, which penetrate into the sealed housing from the plugs of inlet cables on the two end surfaces of the sealed housing, are connected on the cable junction board, and then are led out through the plug of the junction cable outlet. By adopting a cylindrical streamline sealed housing design, the cables on the plugs realize junction inside the sealed housing, and thus the problem of high seawater infiltration tendency in the underwater junction of cables is solved. A sacrificial anode enhances the corrosion resistance of the whole sealed housing underwater and especially in seawater.

The invention specifically relates to an underwater local dry-method GMAW welding torch for a double-layer gas structure. The underwater local dry-method GMAW welding torch for the double-layer gas structure comprises a direct-current motor, a welding gun with an extended nozzle, a water drainage cover, and a water drainage gas-settling cover installed between the direct-current motor and the water drainage cover, wherein a hollow shaft of the direct-current motor extends downwards and penetrates through a hollow part of the water drainage gas-settling cover to reach the bottom surface of thewater drainage gas-settling cover; the water drainage gas-settling cover is fixedly installed on the lower surface of the direct-current motor; water drainage gas is charged into an inner chamber of the water drainage gas-settling cover through an intake port formed in the sidewall of the water drainage gas-settling cover; an annular rotary ventilation disc is installed on the bottom surface of the water drainage gas-settling cover, the upper surface of the water drainage cover is fixedly connected to the lower surface of the rotary ventilation disc, and a through hole adaptive to the rotary ventilation disc is formed in the upper surface of the water drainage cover and used for realizing flowing of the gas; an exhaust hole is formed in the sidewall of the water drainage cover and rotary blades are arranged on the sidewall of the water drainage cover; the water drainage cover can be driven to rotate through the rotation of the direct-current motor, the rotary blades can be driven to rotate, so that the water drainage effect is improved; and the welding gun with the extended nozzle passes through the hollow shaft and then penetrates out of the water drainage cover. According to thedevice, the adopted water drainage gas is high-temperature gas, and a great water drainage effect is achieved.