38 results about "Lifting gas" patented technology

The invention discloses a wind power generation system. The system comprises a ground device; the floating device comprises an adjusting air floating piece and a first annular air floating piece, the adjusting air floating piece is movably connected with the ground device, the first annular air floating piece is connected with the adjusting air floating piece, and a through duct is defined by the inner wall of the first annular air floating piece; the wind power generation device is arranged in the duct; and the position of the gravity center of the adjusting air floating piece in the extending direction of the duct is adjustable. According to the wind power generation system, the influence of airflow disturbance, temperature change and buoyancy lift gas leakage on the floating device can be reduced, the phenomenon that the pitching posture change amplitude is large is reduced, particularly, the included angle between the wind receiving face of the blade of the wind power generation device and the airflow direction is closer to the optimal value, the effective wind energy area flowing through the blade is increased, and the wind power generation efficiency is improved. And the fluctuation of the wind energy yield along with the posture is reduced, so that the wind energy utilization efficiency and the power generation output power are improved.

According to one aspect, a reactor for generating lifting gas may include a first port, a second port, a coupling releasably securable in fluid communication with an aerostat, and a tank including a base and a crown defining at least a portion of a chamber therebetween, the first port and the coupling each supported on the crown, the second port supported on the tank away from the crown, the chamber in fluid communication with each one of the first port, the second port, and the coupling, the chamber expandable between the crown and the base from an uninflated state to an inflated state and, with the tank in the inflated state, a maximum height of the chamber less than a maximum dimension of the base.

The invention relates to the technical field of hoisting equipment control, in particular to a double-beam crane control device for a lifting gas engine unit of a power plant, which comprises the following modules: a load stabilizing module for monitoring the tension difference and the swing amplitude of a hoisting cable in real time and starting an automatic adjusting function when the tension difference and the swing amplitude exceed a set threshold value; the path planning module is used for generating a hoisting path according to the weight and the size of the gas engine unit and adjusting the path when an obstacle or working condition change is detected; the dynamic balance module is used for monitoring the vertical offset and the vibration condition of the gas engine unit, and the alarm prompting module is used for sending out an acousto-optic warning signal when an abnormal condition occurs in the hoisting process; according to the method, intelligent feedback control, self-adaptive path planning and high-precision positioning technologies are introduced, so that the defects in the aspects of load stability, dynamic balance control and complex working condition adaptability in the prior art are overcome, and the safety and high efficiency of the gas engine unit in the hoisting process are ensured.

There is provided a lift gas evacuation assembly (200) comprising an input conduit (210) for receiving a stream of lift gas and gas-lifted material from a riser, an output conduit (220) with an output conduit section (222) for returning the stream to the riser, and an intermediate conduit (230) interconnecting the input and output conduits. The intermediate conduit includes an inner surface section along which lift gas concentrates by gravity during operation. A lift gas evacuation conduit (242, 244) is fluidly connected to the intermediate conduit at the inner surface section for evacuating some of the lift gas. The assembly redirects the stream from an input direction (Din) to a first intermediate direction (D1), then to a second intermediate direction (D2), and finally to an output direction (Dout) coaxially aligned with the input direction (Din).

The utility model relates to a ballast adjusting system for a high-altitude balloon, and relates to the technical field of high-altitude balloons. Comprising an outer balloon, an inner balloon, a storage cabin, a ballast, a first control switch and a movable baffle. A first accommodating space is formed in the outer balloon, and the first accommodating space is filled with buoyancy lift gas; the inner balloon is arranged in the first accommodating space, and a second accommodating space is formed in the inner balloon; a third accommodating space is formed in the storage cabin, and the third accommodating space communicates with the second accommodating space; the ballast is arranged in the third containing space and used for being gasified to enter the second containing space. The first control switch is arranged at the joint of the storage cabin and the inner balloon; an opening is formed in the side, away from the inner balloon, of the storage bin and communicates with the third containing space, and the movable baffle covers the opening. The problems that the ballast adjusting system of the high-altitude balloon is poor in sustainable adjusting effect and high in energy consumption are solved by prolonging the time through phase change of the ballast and opening and closing of the movable baffle.

A captive balloon support structure assembly comprising a captive balloon which is filled with a lifting gas having a lower density than the ambient air and is kept floating at a specific altitude above the ground. A three-dimensional wide-meshed supporting net that is tethered to the ground is placed over the captive balloon.

A system includes: a balloon module; a sail module; a ballast module; and a bridle assembly. The balloon module includes an inflatable element containing a volume of lifting gas. The sail module defining a first edge and a second edge and including: a control surface extending between the first edge and the second edge; payload sensors; and a motorized spool arranged proximal the second edge of the sail module. The ballast module: is arranged below the sail module; and includes a container containing a ballast material. The bridle assembly includes: a set of fixed sail cables coupling the balloon module to the first edge of the sail module; and a sail control cable wound about the motorized spool and coupling the balloon module to the second edge of the sail module.

The utility model discloses hot galvanizing protection equipment with a nano coating structure, which comprises a lifting gas guide cover, a lifting guide rod is arranged on the lifting gas guide cover, a connecting pipe orifice is arranged on the lifting gas guide cover, the connecting pipe orifice is connected with a telescopic pipe, the telescopic pipe is connected with a control flue, and the control flue is connected with the nano coating structure. A non-contact gas guide control assembly is arranged on the control flue; through collaborative design of an L-shaped control flue and a non-contact gas guide control assembly, high-speed gas flow generated by a fan is matched with a slope structure of a flow guide channel to form a negative pressure effect, non-contact flow guide of flue gas in the whole process is achieved, the problem of fan corrosion is avoided, a liquid cooling heat exchanger is integrated in a protective notch, and the chimney effect is enhanced through the condensation effect; the whole process is covered by a nano anti-corrosion coating, so that the problems of serious corrosion and frequent maintenance of traditional flue gas emission equipment are solved.

The invention provides a pressure control device and method for a soft airship in a buoyancy gas insufficiency state. The device comprises an air bag pressure sensor, an auxiliary air bag pressure sensor, a pressure control computer, an auxiliary air bag tearing width, a tearing width motor, a mounting base, a laser range finder and an air blower. Wherein the air bag pressure sensor and the pressure control computer are arranged on the main air bag, and the auxiliary air bag pressure sensor, the auxiliary air bag tearing width, the tearing width motor, the mounting seat, the laser range finder and the air blower are all arranged on the auxiliary air bag; according to the method provided by the invention, an airship operator can timely know the opportunity of insufficient buoyancy lift gas of the airship, and the communication of the main airbag and the auxiliary airbag is realized by utilizing a set of mechanism when the condition occurs, so that the airbag space can be further filled with air filled into the auxiliary airbag; and it is ensured that the appearance and rigidity of the soft airship can still be maintained when floating gas is insufficient.

The application provides a small buoy and a coordinated action implementation method thereof. A buoyancy bag with a maximum diameter is designed in a middle cabin section of the buoy to adapt to a change in the central position of the buoy, and the buoy floating stability is improved. The buoyancy bag gas cylinder is designed to inflate the buoyancy bag, and the buoyancy bag is inflated and expanded to the designed diameter to adjust the buoyant center position of the buoy, so that the buoy floating posture is kept stable. The lifting gas cylinder is inflated to inflate the piston cavity, the thrust generated in the inflation instant is used to overcome the gravity, friction and tensile force of the breakable screw of the detection device, so that the detection device can move to the set height. The gas cylinder is inflated to inflate the sealing cavity of the telescopic mechanism, and the friction and shear pin resistance are overcome to expand the telescopic mechanism. The application provides a small buoy and a coordinated action implementation method thereof, and the detection device lifting and the buoy posture adjustment are realized in coordination. The coordinated action has high reliability, and the technical problems of the detection device lifting and the buoy posture dynamic adjustment in a small space are solved.

The present application relates to a kind of gas timing valve in the technical field of safety valve, containing valve body, there is cavity in valve body, its opposite sides are respectively equipped with air inlet, air outlet pipeline communicated with cavity, transmission assembly for opening and closing air outlet pipeline is equipped in cavity.The air outlet pipeline air outlet end is fixedly connected overflow reset device, the device includes button assembly, connector and overflow component in the air inlet passage of connector.Button assembly contains button cap, button guide sleeve and movement shaft, button cap is sleeved in one end of button guide sleeve, button guide sleeve is axially through and is equipped with annular boss.Movement shaft is stepped shaft, smaller end is fixed in button guide sleeve and button cap, reset spring is sleeved, and the both ends of spring are respectively abutted button cap inner top and annular boss;The diameter of larger end is greater than the inner diameter of annular boss, middle part is equipped with annular necking and is equipped with reset sealing ring, and the end away from button cap is conical.Connecting head has through-hole, button guide sleeve is fixed in through-hole, and the reliability of valve core reset after lifting gas overflow can be improved.

The invention relates to the technical field of buckwheat hulling, and discloses a buckwheat grain dual-mode hulling experimental device which comprises an experimental box, a feeding part is arranged on the upper side wall of the experimental box, and a discharging part is arranged on the lower side wall of the experimental box; the closed type gas circulation system comprises an experiment box, a spiral material lifting gas inlet piece and at least three stirring gas supply pieces are coaxially arranged in the experiment box, the spiral material lifting gas inlet piece is located in the center of the experiment box, and the stirring gas supply pieces are evenly distributed in the circumferential direction of the spiral material lifting gas inlet piece. Particularly, more than 80% of moisture is recycled in a high-humidity mode, energy consumption is remarkably reduced, temperature and humidity stability is greatly improved, uniform softening or pre-shelling of buckwheat grains is ensured, uniform coverage of airflow from bottom to top is ensured due to the design of gradient blades and incremental air inlet holes of the spiral lifting air inlet part, and the device has the advantages of being high in practicability and accurate in temperature and humidity control.

An aerostat tether, anchorage, and tether spool system which extends the “On Station” uninterrupted intervals of service for which a “Lighter Than Air” (LTA) aerostat may stay aloft at its designated altitude without requiring retrieval for ground service. Anchoring vessels are provided at both the aerostat and ground control ends of the tethered system which enables remote control of varying choices for bi-directional gas flow patterns within the tether which better facilitate continuous lift gas maintenance and emergency control. The gas routing is selectively controlled per best practice toward the constant filtering and scrubbing of the lift gas within both the aerostat and the tether restraining the aerostat. The system uniquely provides for a very rapid switch-out of tethers by having a full “replacement tether spool” on the ground at the ready which is pre-wound, pre-filled, and sealed with fresh lift gas where it is available at all times for rapid changeout. Quick tether replacement is accomplished by interchangeable quick disconnect fittings at both ends of a hollow tether with a hollow piston valve stem to provide a simple process of unplugging the tether at both the aerostat to close the valves and ground terminal ends and then plugging in the replacement tether to open the valves and reinstituting deployment facilitated by the unique tether spool and anchoring system. The system also enables the effective prevention and dissipation of damage due to torque forces being applied to the tether by a weathervaning aerostat. This is accomplished through counter rotation being applied to the tether at the most advantageous and effective source of tether / aerostat union, at its point of attachment at the aerostat end since the tether attachment point (TAP) is where damage to the tether is most likely to occur. Also favorable to the longevity of service, the aerostat system provides improvements of electrical strike / static build-up dissipation as well as superior tether terminal end preparation, interconnection speed, and short turnaround repair times. The entire aerostat system is designed for plug and play usage and versatility.

The application discloses a kind of dual floaters system based on sail navigation and its regional residence control strategy, system includes the upper buoyancy ball and lower float boat connected by traction rope;The vertical tail of the capsule body tail of lower float boat is provided with, the symmetrical stabilizer of the upper and lower of capsule body is provided with, can cause Bernoulli effect, energy cabin is connected outside capsule body, and adjusting device is arranged in energy cabin to realize the retraction of traction rope;Solar panel is installed on the left and right sides of capsule body to power supply adjusting device, and auxiliary air bag is built-in in capsule body;The upper buoyancy ball and float boat are filled with quantitative lifting gas in capsule body, and air inlet and air outlet are arranged in auxiliary air bag, compressor is installed at air inlet to supplement air for auxiliary air bag, and air release opening is opened to release air for auxiliary air bag;The capsule body of float boat is suspended with load cabin under side.This application solves the problem of unpowered floater regional / point residence, solves the key problem of long-time ground reconnaissance monitoring, regional communication relay and other application needs of floater.

A variable-volume aerostat, consisting of a flat gas envelope, joined to guide aerostat bodies. The flat gas envelope is typically deployed by rotation of cylindrical guide airships, or rollers suspended beneath guide aerostats. In its stowed configuration, the flat gas envelope is rolled, uninflated and relatively compact. As the invention ascends to high altitude, lifting gas expands out of the guide aerostats into the unrolling flat gas envelope. When fully deployed, the flat gas envelope is self-supporting, and has a horizontal surface area up-to 100 times larger than that of the guide aerostats. This is a major advantage in potential applications, including targeted Solar Radiation Management (SRM), and airborne solar power generation.

A hybrid airship system comprising an envelope containing a lifting gas for generating buoyant lift, at least one rotor assembly mounted to the airship and configured to generate downward thrust to counteract over-buoyancy, and a control system configured to dynamically adjust operation of the at least one rotor assembly based on buoyancy conditions of the airship. The control system monitors buoyancy conditions and automatically activates the rotor assembly to generate downward thrust when over-buoyancy is detected, eliminating the need for ballast release. The rotor assembly operates in reverse thrust mode to provide precise altitude control and stability during flight operations. The lifting gas comprises helium or hydrogen contained within the envelope structure.

The application relates to the technical field of aerostats, and discloses a double-cabin structure aerostat. The aerostat comprises a buoyancy cabin, a pressure cabin and a connecting structure, the buoyancy cabin and the pressure cabin are independent of each other and do not share a wall surface, and the two are connected into a whole through the connecting structure. The buoyancy cabin is used for containing lifting gas, the capsule body of the buoyancy cabin comprises a gas-blocking layer, the gas-blocking layer adopts an EVOH composite film; the pressure cabin is used for containing air, in some embodiments, the pressure cabin is a pressure-resistant capsule structure, the capsule body of the pressure cabin comprises a force-bearing layer, and the force-bearing layer adopts a UHMWPE fabric; in other embodiments, the pressure cabin is a high-pressure gas cylinder. By filling air into the pressure cabin or discharging air from the pressure cabin, the air mass in the pressure cabin is changed, the overall average density of the aerostat is adjusted, and the lifting control of the aerostat is realized. The structure can improve the pressure-bearing capacity of the pressure cabin while guaranteeing the air-tightness of the buoyancy cabin, and has the advantages of simple structure, high adjustment efficiency and low cost.

A system includes: a balloon module; a sail module; a ballast module; and a bridle assembly. The balloon module includes an inflatable element containing a volume of lifting gas. The sail module defining a first edge and a second edge and including: a control surface extending between the first edge and the second edge; payload sensors; and a motorized spool arranged proximal the second edge of the sail module. The ballast module: is arranged below the sail module; and includes a container containing a ballast material. The bridle assembly includes: a set of fixed sail cables coupling the balloon module to the first edge of the sail module; and a sail control cable wound about the motorized spool and coupling the balloon module to the second edge of the sail module.

The utility model relates to the technical field of waste gas treatment, and particularly discloses a movable convenient modular incineration device which comprises a shell, and an open hole is formed in the top of the shell; the lifting gas supply mechanism is arranged on the shell, the lifting gas supply mechanism comprises a fan, a first lifting space, a second lifting space and a lifting assembly, the fan communicates with the first lifting space, the first lifting space communicates with the second lifting space, and a waste gas input port is formed in the second lifting space; a waste gas discharge port is formed in the top end of the first lifting space; the lifting assembly comprises a lifting valve and a baffle, a valve rod of the lifting valve is connected with the baffle, the baffle is arranged in the first lifting space, and the lifting valve drives the baffle to move; the heat storage incinerator is installed in the shell, and the heat storage incinerator communicates with the waste gas input port; the waste gas incineration device overcomes the defects that in the prior art, a waste gas incineration device is insufficient in safety and short in service life.

Balloon launching systems and methods relating thereto are described. A method of launching a balloon includes securing a balloon to an everting platform and disposing the platform within a launch chamber having an inflatable tubular membrane. The everting platform couples to the inflatable tubular membrane such that the balloon is positioned inside a launch cavity while a pressurization cavity is defined adjacent thereto. Lifting gas is dispensed into and sealed within the balloon. The pressurization cavity is pressurized to an everting pressure causing the inflatable tubular membrane to evert and extend above a balloon launching end of the launch chamber. The everting membrane accelerates the inflated balloon toward the launching end and surrounds and shields the balloon from cross-winds and ground obstacles. The balloon is released after membrane extension.

The invention provides a heavy oil recovery near-well directional heating-golf gas lift coupling method and system. The system comprises a sleeve, a tail pipe, a ball feeding pipe, a lifting pipe and a heat source injection pipe, wherein the ball feeding pipe, the lifting pipe and the heat source injection pipe are arranged in the sleeve. The tail pipe, the ball feeding pipe and the lifting pipe are communicated through a three-manifold structure; the tail pipe extends to an underground oil layer. One end of the heat source injection pipe is connected with a ground steam heat source, and the other end at least extends below the three-way structure. The heat source injection pipe is used for conveying heating gas to the tail pipe and an underground oil layer adjacent to the tail pipe so that the viscosity of oil entering the lifting pipe can be reduced. The ball throwing unit is used for throwing a gas-lift ball to the ball feeding pipe, and the lifting gas source is used for pushing the gas-lift ball to lift up in the lifting pipe with liquid. The controller is connected with the lifting gas source, the steam heat source and the ball throwing unit and used for adjusting the emission frequency of the gas lifting ball and parameters of lifting gas and heating gas in real time. Phase change instability caused by the fact that heating gas enters the lifting pipe can be avoided, the heat efficiency and the lifting stability are remarkably improved, and the device is suitable for thickened oil recovery.

The application discloses an automatic lifting gas-liquid mixing high-efficiency reduction dearsenic device and a use method. Through the synergistic effect of the liftable air distribution device and the diffusion type gas-liquid mixing nozzle, the micro-bubble tangential spiral injection is realized, the SO2 utilization rate is increased to 70-90%, the reaction time is shortened by more than 50%, and the comprehensive energy consumption is reduced by 50-70%; after the reaction is completed, the nozzle is automatically lifted to separate from the liquid surface, and the residual temperature condensate water is used for online backwashing, so that the crystallization blockage is completely eliminated; in combination with the PLC full-automatic closed-loop control, the stable operation of high efficiency, low consumption, blockage prevention and zero emission is realized.

The present application discloses an anaerobic three-phase separation system and a method for using the same. The anaerobic three-phase separation system includes a reaction tank and a gas collection tank. The gas collection tank is located on the outer side of the reaction tank, and the side wall of the reaction tank separates the gas collection tank from the reaction tank. A reflector array is provided inside the reaction tank. The reflector array includes a plurality of reflectors. The reflectors are long and narrow folded plate structures. The reflectors have two side wings, and an angle facing downward is formed between the two side wings. An air vent for inserting the end of the reflector is provided on the side wall of the reaction tank, and the air vent communicates the gas collection tank with the reaction tank. A side opening is provided on the side of the gas collection tank away from the reaction tank, and a sealing plate for closing the side opening is provided on the gas collection tank. A gas-liquid separation chamber is provided at the top of the reaction tank, and a lifting gas pipe is connected between the bottom wall of the gas-liquid separation chamber and the top wall of the gas collection tank. In the present application, the sealing plate of the gas collection tank can be removed to expose the side opening and the air vent, so that the staff can flush the reflectors through the air vent.

The invention relates to the technical field of aerostats, and discloses an aerostat with a double-cabin structure. The aerostat comprises a buoyancy cabin, a pressure-bearing cabin and a connecting structure, wherein the buoyancy cabin and the pressure-bearing cabin are respectively formed by mutually independent bag bodies and have no shared wall surface. The buoyancy cabin is used for containing lifting gas, a bag body of the buoyancy cabin comprises a gas blocking layer, and the gas blocking layer is made of an EVOH composite film. The pressure-bearing cabin is of a pressure-resistant structure and used for containing air, a bag body of the pressure-bearing cabin comprises a force-bearing layer, the force-bearing layer is made of UHMWPE fabric, and the pressure-bearing cabin can bear gauge pressure not lower than 5 kPa. Different materials are adopted to form the bag body structures of the buoyancy cabin and the pressure-bearing cabin respectively, the pressure-bearing capacity of the pressure-bearing cabin is improved while the airtight performance of the buoyancy cabin is guaranteed, therefore, effective adjustment of the overall density of the aerostat is achieved under the condition of the small size, and the aerostat has the advantages of being simple in structure and low in cost.

A rocket stage for a multistage space launch vehicle, wherein the rocket stage includes a main engine and is configured for stage separation from remaining parts of the space launch vehicle such that the rocket stage returns to the surface of the earth, wherein rocket stage includes an inflatable hull configured to retain lifting gas from a pressure tank, an inflation unit, a propulsion and steering unit configured to provide thrust and attitude control to the rocket stage, and a control unit configured to initiate inflation of the hull by controlling the inflation unit after the stage separation and to control the propulsion and steering unit to maneuver the rocket stage to a specified landing site on the surface of the earth.

The utility model discloses a gas rising and fast liquid collecting device which comprises a liquid collecting partition plate, gas cap assemblies, a front liquid collecting assembly and a rear liquid collecting assembly, the top of the liquid collecting partition plate is connected with a plurality of gas cap assemblies, and each gas cap assembly is composed of a gas inlet, a gas cap barrel, a supporting plate, a gas outlet and a gas cap cover. The gas inlet is connected into a through hole formed in the liquid collecting partition plate, the gas inlet is connected with a gas cap barrel, the gas cap barrel is connected with a supporting plate, the supporting plate is connected with a gas outlet and a gas cap cover, and the bottom of the liquid collecting partition plate is fixedly connected with a front liquid collecting assembly; according to the gas cap assembly, through cooperation of the gas inlet, the gas cap barrel, the supporting plate and the gas outlet, the structural strength of the gas cap assembly is improved, the construction difficulty is lowered, and the construction cost and the construction time are reduced; meanwhile, through cooperation of the liquid collection partition plate, the waterproof motor, the rotating shaft and the fan blades, uniform and rapid liquid collection is achieved, and the overall performance of the absorption tower is improved.

An aerial vehicle includes: a first inflatable element; a first mass of lifting gas contained within the first inflatable element; a second inflatable element coupled to the first inflatable element; and a second mass of a volatile fluid. The second mass of a volatile fluid: is contained within the second inflatable element; is characterized by a saturation-vapor-pressure curve that intersects an atmospheric temperature-pressure profile within an operational altitude range of the aerial vehicle; is configured to condense during ascent of the aerial vehicle across a first phase-transition altitude, in the operational altitude range, to passively reduce a net buoyancy of the aerial vehicle; and is configured to evaporate during descent of the aerial vehicle across a second phase-transition altitude, in the operational altitude range, to passively increase the net buoyancy of the aerial vehicle.

The present disclosure provides an emergency exhaust device of a lighter-than-air vehicle and a lighter-than-air vehicle having the same, including: an initiator installed at a top surface of a capsule of the lighter-than-air vehicle, the capsule being filled with a lifting gas; and a cutting rope connected to the initiator, an inside of the cutting rope being filled with a combustible to be ignited after the initiator is detonated, the cutting rope cutting the capsule under a blasting force to cause the lifting gas to be exhausted from an inside of the capsule, thereby causing the lighter-than-air vehicle to land.

The utility model provides a gas lifting disc structure, which relates to the technical field of gas-liquid separation equipment and comprises a box body, the bottom of the box body is hollowed out, wing plates are upwards arranged on two opposite sides of a top plate, one end of each wing plate is flush with a side plate of the box body, the other end of each wing plate extends out of the other side plate of the box body, and the two wing plates and the top plate form a top collecting tank; one or more layers of side collecting grooves are formed below the two wing plates from top to bottom, and side plates of the box body from the lower edge of each wing plate to the groove bottom line of the lowermost layer of side collecting groove below the wing plate are hollowed out; the groove bottom line and the wing plate above the groove bottom line are located in the same vertical plane, the two ends of the groove bottom line are flush with the two ends of the wing plate above the groove bottom line, one end of the groove bottom line abuts against the side plate of the box body, and the other end of the groove bottom line inclines downwards and extends out of the other side plate of the box body; and the notch is fixedly connected with the side collecting groove. According to the utility model, spraying cooling water is efficiently prevented from entering the desulfurization slurry tank, and purified flue gas smoothly flows out of the absorption tower.

According to one aspect, a system for launching an aerostat may include an inflatable structure defining a volume having a neck, a reactor defining a chamber, a coupling releasably secured in fluid communication between the chamber and the neck, and a drain valve within the volume, the drain valve in a first position away from the neck to receive a lifting gas from the chamber into the volume via the coupling, the drain valve movable from the first position to a second position when the coupling is released from fluid communication between the chamber and the neck, and the drain valve in the second position in sealed engagement with the inflatable structure along the neck to control accumulation of condensate from the lifting gas within the volume.