92results about How to "Balance internal and external pressure" patented technology

The invention discloses a construction method of plastic acoustic pipe fixation, which comprises the following steps: first, connecting the plastic acoustic pipe as long as reinforcement cage with the major steel of reinforcement cage; second, connecting the roll end with the last acoustic pipe end and one end of joining member with the other end of acoustic pipe by binder; then, dragging the drilling; putting down the reinforcement cage; injecting water in the acoustic pipe; putting down the second reinforcement cage in connection with the former cage; connecting the acoustic pipe with the inner acoustic pipe of previous reinforcement cage by joining member and binder; filling the acoustic pipe with clean water until the last pipe according to the analogy; binding the roll end and the top of acoustic pipe by binder; finally, casting concrete. This method has the following characteristics: simple construction process; low strength construction for workers; low cost and so on, which can be set in the filling plastic acoustic pipe.

The invention relates to the technical field of automobile part casting, and discloses a high-pressure spraying cooling casting forming process. The high-pressure spraying cooling casting forming process includes the steps that a mold is closed, a holding furnace is subjected to five-section pressurizing and pressure maintaining, and molten aluminum in the holding furnace is subjected to mold filling; and pressure is released 230+/-20 s after pressure maintaining, natural cooling is carried out for 50+/-10 s, the mold is opened, and a product is taken out. In the low-pressure casting process,by means of heat insulating passageways of an upper mold body and a lower mold body, the molten aluminum between an upper mold plate and a lower mold plate and the molten aluminum between an upper mold core and a lower mold core are kept at a temperature difference; and the molten aluminum between the upper mold plate and the lower mold plate is solidified, the molten aluminum between the upper mold core and the lower mold core is kept in a liquid state, the molten aluminum conveniently flows back to the holding furnace during pressure release, thus, a wheel cavity is formed between the uppermold core and the lower mold core, and the utilization rate of the molten aluminum is effectively increased.

The invention discloses an underwater oil-filled through sealing method and device for umbilical cables and belongs to the technical field of undersea robots. The underwater oil-filled through sealing device comprises an inner protection layer, an outer protection layer, heat-shrinkage protection material, a substrate and a flexible bushing, wherein a hoop is arranged outside the flexible bushing, a lead is located in the inner protection layer, and compensation oil is filled in a cavity composed of the end of the inner protection layer and the substrate. Both the substrate and flexible bushing are hollow, and an anti-loosening step is arranged at the joint between the substrate and the flexible bushing to clamp the substrate with the flexible bushing. The underwater oil-filled through sealing method and device for umbilical cables realize underwater oil-filled through sealing and enable the balance between the pressure inside the umbilical cable and the pressure outside the umbilical cable to be guaranteed; the underwater oil-filled through sealing device is resistant to high pressure, suitable for the whole sea and simple in structure, and meanwhile, the oil-filled through sealing device does not need a connecting plug and realizes to quickly and easily seal with equipment or apparatus under the condition that the existing cable is not provided with a plug.

The invention discloses an air pressure heat storage type water heater. The air pressure heat storage type water heater is characterized by comprising a shell, a water storage inner container, a water inlet device, a water outlet device, a heating device, a sensing device, a circuit control assembly and a parameter control panel. The shell and the inner container are combined in a sleeved mode to form a double-layer vacuum insulation structure, or the space between the shell and the inner container is filled with foam insulating materials to form a foam insulation structure so that the heat preservation effect of the water heater can be improved. An air storage cavity is arranged in the water heater. A pressure device is pre-mounted in the air storage cavity or can be connected with the air storage cavity for injection of air, so power can be provided for water discharge in the water using process of the water heater, the water yield is increased, energy consumption is lowered, and the energy efficiency of the water heater is improved. In addition, in the water discharging process of the water heater, the water inlet device cuts off communication between inflow water and the water storage inner container, and the heating device stops heating synchronously, so it can be guaranteed that cold water and hot water are not mixed in the using process, and the problems of heat loss and power consumption due to repeated heating when the cold water and the hot water are mixed in a water storage cavity are effectively avoided. The air pressure heat storage type water heater is high in energy efficiency, good in heat preservation effect, small in occupied space and convenient to install, and the inner container is low in manufacturing cost.

Provided in the invention is a drive motor of an underground electric drilling tool. The drive motor comprises a housing in a cylindrical shape, a rotor shaft, a rotor, a stator, and a piston. The rotor shaft having a central hole penetrates the inside of the housing along the axial direction; an enclosed cavity for filling oil fluid is formed between the rotor shaft and the housing; and the rotor shaft extends out of the cavity and is connected with a load. The rotor is arranged in the cavity and is fixed on the rotor shaft. The stator arranged in the cavity is sleeved between the housing and the rotor. The piston in an annular shape can be sleeved between the rotor shaft and the housing in a sealing and sliding mode at an axial direction; and the piston located at the bottom of the cavity can slide to balance pressures inside and outside the cavity. The provided drive motor has a high efficiency and can adapt to an underground high-temperature high-pressure complex external environment.

The invention belongs to the technical field of lard oil processes and in particular relates to a method for making low-temperature refined pickled lard oil. The method comprises the following steps:selecting raw materials, trimming and cleaning, cutting into pieces, pickling, carrying out vacuum refining, separating oil from residues, filtering, filling, preserving, and the like, thereby obtaining a product. By adopting the method, the problems that in the prior art, lard oil is liable to deterioration in the production process and a product cannot be quantitatively added can be solved; withthe combination of pickling and vacuum refining, the acid value and the peroxide value of a pickled lard oil product can be remarkably reduced, the preservation time of the lard oil can be effectively prolonged, and meanwhile, quantitative packaging and addition of the pickled lard oil product can be achieved.

The invention discloses a refrigerator and a door thereof. The door of the refrigerator comprises a door body and a door seal, and the door seal is tightly attached between the door closing position of the door body and the door opening position with a certain distance from the door body, and is movably arranged on the door body. The door of the refrigerator has the advantages that the door can be opened conveniently, and condensation of the refrigerator can be prevented.

The invention discloses an improved high-voltage cable connector for an underground transformer. The connector consists of an insulating joint seat and an insulating seal cover, wherein a high-voltage static contact through hole is formed in the lower end face of the insulating joint seat; a high-voltage static contact rod is arranged in the high-voltage static contact through hole; the insulating seal cover is arranged on the upper end face of the insulating joint seat; a cable through hole is formed in the insulating seal cover; an upper screw cover is arranged at the upper end of the insulating seal cover and connected with the insulating seal cover; a lower screw cover is sleeved outside the insulating seal cover and connected with the insulating joint seat; a high-voltage dynamic contact insulating sleeve is arranged in the insulating joint seat; a high-voltage dynamic contact rod is arranged in the high-voltage dynamic contact insulating sleeve and connected with the high-voltage static contact rod by an electric connecting piece; and insulating liquid is filled between the insulating joint seat and the insulating seal cover. The upper screw cover, the insulating seal cover and the insulating joint seat are connected by threads and sealed by seal rings, and the insulating liquid improves internal insulating capability and balances pressure inside and outside a shell, so that a reliable seal is realized. The improved high-voltage cable connector is suitable for the underground transformer.

The invention relates to the field of oil field underground setting systems, in particular to an electric hydraulic bridge plug setting system. The electric hydraulic bridge plug setting system comprises an electronic control system and a hydraulic system, wherein one end of the electronic control system is connected with an external ground control system, the other end of the electronic control system is connected with the hydraulic system, one end of the hydraulic system is connected with the electronic control system, and the other end of the hydraulic system is connected with an external bridge plug. The electronic control system comprises a carrier wave communication module, a power source module and a motor driving module, the hydraulic system comprises a motor pump module, an oil tank module and a valve bank module, and the carrier wave communication module, the power source module, the motor driving module, the oil tank module and the valve bank module are connected in sequence. 48V constant value output is achieved under the broad input voltage of 150-300V; the effects of miniaturization of component and part model selection and good heat dissipation are solved, the mode of capsule oil storage is adopted, expansion caused by heat and contraction caused by cold of oil are achieved, pressure inside and outside an oil tank is balanced, the output oil space is effectively compensated.

A submarine-specific porthole device includes a window connected with a double-layer explosion-proof glass through a connecting device. The connecting device comprises reinforcing ribs provided with grooves matching clamping slots on the explosion-proof glass. Silica gel pads fill connection points between the grooves and the matching slots, and are connected through a curing agent. Fixing hoops are arranged on that reinforcing ribs and the explosion-proof glass. The reinforcing ribs are provided with air holes connected with a gate through a locking member. The reinforcing ribs are provided with supports perpendicular to the reinforcing ribs. A light-transmitting base plate is arranged in that middle of the double-layer explosion-proof glass. A transverse bar is arranged on the top of thewindow, and the transverse bar is connected with a rolling curtain device. The rolling curtain device comprises a rolling curtain fixed by a rotating shaft. Safety rings are arranged at two ends of the rotating shaft. The safety rings are connected with a limiting block. The limiting block is provided with a fixing bar. The fixing bar is vertically welded with the transverse bar. The rotating shaft is respectively connected with an adjusting knob and a hand swing handle. The submarine-specific porthole device is sealed, stable, pressure-resistant, waterproof, moisture-proof, corrosion-proof,convenient for sampling and investigation, and has privacy.

The invention discloses a static pressure balancing device of a transmission case, which is used for improving internal and external pressure imbalance of the transmission case (13) when a liquid pressure medium works. The static pressure balancing device comprises a gas pressure balancing pipe (11) which is communicated with an inner cavity (131) of the transmission case (13) and a gas conveyingdevice (12) which is communicated with the gas pressure balancing pipe (11); a downward exhaust port (111) is formed at the bottom end of the gas pressure balancing pipe (11); when only the residual gas is overflowed form the exhaust port (111) and external liquid can not immerse into the gas pressure balancing pipe (11) by maintaining through the control of flow rate and pressure of gas sent by the gas conveying device (12) and sent into the gas pressure balancing pipe (11), the gas pressure in the gas pressure balancing pipe (11) and the fluid pressure at the exhaust port (111) are balanced;and when the installation heights of the exhaust port (111) and the transmission case (13) are equivalent, the pressure of the inner cavity is basically equivalent to the that of an outer cavity of the transmission case (13).

The invention discloses a device and method for backwashing and inerting an oil tank of a military unmanned aerial vehicle through fuel oil. The device comprises a first air generation unit, a hollowfiber membrane air separation assembly, a first electromagnetic valve, a second air generation unit, a second electromagnetic valve and a mixing valve. The first air generation unit, the hollow fibermembrane air separation assembly and the first electromagnetic valve are connected in sequence; the second air generation unit is connected with the second electromagnetic valve; the mixing valve is provided with a first inlet, a second inlet and an outlet; outlets of the first electromagnetic valve and the second electromagnetic valve are connected with a first inlet and a second inlet of the mixing valve correspondingly, and an outlet of the mixing valve communicates with the bottom of the unmanned aerial vehicle oil tank. The military unmanned aerial vehicle fuel tank is backwashed and inerted through fuel oil, the situation that an aircraft carries a hollow fiber membrane air separation assembly can be avoided, the aircraft weight is reduced, and the influence of engine high-pressure air entraining on the maneuvering characteristics of an unmanned aerial vehicle is reduced.

The application discloses an air pressure balance device used for a sealed high-pressure battery pack of an electric vehicle. The air pressure balance device comprises an elastic seal cover and a protective casing, wherein the elastic seal cover is arranged outside a battery pack casing of the sealed high-pressure battery pack of the electric vehicle; the elastic seal cover is sleeved by the protective casing; the elastic seal cover comprises an elastic corrugated structure tube wall, one side of the elastic seal cover is sealed, and a first mounting flange face is arranged on the opening side of the elastic seal cover, and is hermetically connected with the battery pack casing; the protective casing comprises a second mounting flange face which is pressed onto the first mounting flange face and then is fixedly connected with the battery pack casing. In the application, the sealed high-pressure battery pack is completely sealed and separated by the elastic seal cover, so that even if the pressure inside the sealed high-pressure battery pack is decreased, water outside the elastic seal cover cannot enter the sealed high-pressure battery pack, and the problem of risk that water enters the sealed high-pressure battery pack of the electric vehicle is solved.

The invention relates to the technical field of pipelines, in particular to a double-layer expansion pipe which comprises a hard outer pipe sleeve and an inner layer pipe formed by compounding multiple layers. The two ends of the inner-layer pipe are each provided with a baffle ring, and the outer pipe sleeve is arranged at the exterior of the the inner layer pipe, and located between the two baffle rings. The outer pipe sleeve comprises an elastic connecting piece, a sliding sleeve and two symmetrical half sleeves. The double-layer expansion pipe has the beneficial effects that the outer pipe sleeve has high corrosion resistance and hardness, the inner layer pipe can be prevented from being corroded, and external pressure can be evenly applied to the surface of the inner layer pipe; the situation that the inner layer pipe is broken due to inconsistent internal and external pressure intensity of a local area is avoided; the internal pressure of the inner layer pipe can be adjusted through deformation, and when the inner layer pipe is expanded, the inner diameter of the outer layer pipe can be adaptively increased, so that the balance of the internal pressure and the external pressure is realized, and the inner layer pipe is prevented from being broken; and the expansion degree between the two half sleeves can be limited through the sliding sleeve, and the situation that the inner layer pipe is broken due to excessive deformation is avoided.

The invention discloses a low-differential-pressure synchronous dual-fixed-valve deep-well pump applied to the petroleum industry, which is used for extracting crude oil from a mechanical oil production well. The low-differential-pressure synchronous dual-fixed-valve deep-well pump comprises a pump barrel, an upper fixed valve and a lower fixed valve, wherein the upper fixed valve and the lower fixed valve are both installed below the pump barrel and are connected through a link rod. Because the link rod is designed between the upper fixed valve and the lower fixed valve, the synchronous opening and closing of the double fixed valves are ensured, the lower fixed valve ensures that the flow velocity of well fluid is greatly reduced, and the service life of the oil well pump is prolonged. The invention effectively solves the problems of lagged opening and closing of the fixed valves, low depth ratio of the pump, high differential pressure inside and outside the pump barrel, increased clearance between a plunger piston and the pump barrel, increased pump leakage and the like in the traditional deep-well pump. The invention increases pump efficiency, prolongs pump inspection period, obviously reduces production cost and has obvious economic benefits.

The invention provides a welding protection device for a semi-closed to-be-welded piece. The welding protection device comprises a gas delivering pipe fitting, a first adjusting component and a backflow pressure maintaining assembly. One end of the gas delivering pipe fitting communicates with a protection gas source used for providing protection gas through the first adjusting component, and the other end of the gas delivering pipe fitting penetrates through the backflow pressure maintaining assembly and stretches into a semi-closed inner cavity of the semi-closed to-be-welded piece to deliver the protection gas into the semi-closed inner cavity. The first adjusting component is used for adjusting the flow of the protection gas provided by the protection gas source. The backflow pressure maintaining assembly communicates with the atmosphere and the semi-closed inner cavity respectively, the protection gas entering the semi-closed inner cavity can flow back into the semi-closed inner cavity, and internal pressure is formed in the semi-closed inner cavity. The backflow pressure maintaining assembly is further used for communicating with a pressure measuring device capable of detecting the internal pressure. According to the provided welding protection device for the semi-closed to-be-welded piece, the precision, the usage stability and the cleanliness of the semi-closed to-be-welded piece after welding can be improved, and the welding yield of the semi-closed to-be-welded piece is increased.

The invention discloses a liquid gathering anti-dry pen, and particularly relates to the field of stationery. The liquid gathering anti-dry pen comprises a pen body, a pen head and an outer cover, anink bag is installed in an inner cavity of the pen body, a pen point and a liquid storage core are installed in the ink bag, the pen point is located above the liquid storage core, and ventilation channels are formed in the outer wall surface of the ink bag and the inner wall of one end of the ink bag; and the bottom end of the ink bag is connected with the pen body through a tail plug, an ink storage cavity is formed in the tail plug, sealing plates are fixedly connected to the two sides of the inner wall of the ink storage cavity, and a valve is arranged at one side of each sealing plate. According to the liquid gathering anti-dry pen, through the arrangement of the ventilation channels and an airtight design structure, a volatile material body can be better protected; and liquid is concentrated at the upper end of the liquid storage core in cooperation with the liquid gathering function of the liquid storage core, so that uneven liquid discharging, color fading or pen point drying are avoided, waste caused by material body waste, drying and the like is reduced, the cost and resource waste are reduced, and a better liquid outlet function is achieved for a material body with highsolid content and high viscosity.

The invention discloses a sealing method of outputting electric machine power applied in oil field high-voltage water injection well, as well as its device. It installs electric machine on the fix base, which is connected with the shaft of the electric machine by conversion shaft, and it dips the electric machine to work in a sealed container full of insulting oil and with a flexible case. By working of the electric machine in a sealed storehouse, it largely improves the working condition for the electric machine; by the retractility of the flexible sealing case, ensures the balance of internal and external pressures of the sealed cavity and reduces the pressure difference between two dynamical sealed ends, making the electric machine not acted by axial force. It has advantages of more stable working of electric machine, good waterproofing property, longer service life of electric machine, etc, and it largely reduces the effect of external environment on the electric machine and that of external high-pressure water on the axial acting force and the machine can normally work at the high pressure of the well 60MPa.