17 results about "Pressure difference" patented technology

A pressure-adjustable casting method includes such steps as putting casting mould and molten metal respectively in upper sealed chamber and crucible, vacuumizing them, filling inertial gas or compressed air in the crucible, pressing the molten metal in mould cavity along the flow-up tube under the action of adjustable pressure difference, vacuumizing the vacuum hood while adjusting the pressure in crucible to quickly change it from negative pressure to positive one, solidifying the cast workpiece, and releasing the pressure. Said crucible for adjusting pressure is composed of crucible body, water cooling flange, and pressure adjusting pipe interface.

This invention has a series of multiple parallel plates that form desalination chambers between them that have seawater or other saline water flowing down the inside of one plate of each chamber. Steam which is generated by solar heat or other heat source condenses on the outside of first chamber of the series on the plate, which has seawater running down it. This releases heat that evaporates the seawater. The vapor flows to the other wall (plate) of the desalination chamber and condenses, and this releases heat that flows through the plate to the next stage of parallel plates and evaporates seawater flowing down the other side of the plate. Each succeeding stage operates at a lower temperature than the previous stage. The final stage is cooled by the evaporation of seawater into the air. One embodiment of the invention has the parallel plates sloped at an angle to the horizontal so that the seawater flows down on the lower plate and evaporates with heat supplied from below. The vapor condenses on the ceiling of the chamber. Since each succeeding stage upward is at a lower temperature, the vapor pressure will be lower in succeeding stages. This pressure differential can be used to pump the seawater from one stage to the next higher stage.

The invention discloses a battery pack active equalization method and a battery pack active equalization device. The battery pack active equalization device is composed of an intelligent control unit, a BMS communication unit, a differential-amplification pressure difference detection unit, and an electric energy transfer unit. The BMS communication unit acquires the current value and ampere hour from a BMS. The differential-amplification pressure difference detection unit detects the voltage of batteries one by one through a differential amplifier and sends the detection values to the intelligent control unit. The electric energy transfer unit is used for transferring energy from a battery cell to a battery cell, from a battery cell to a battery module or from a battery cell to a battery pack. The intelligent control unit receives the current value and ampere hour information acquired by the BMS communication unit and the test values of the differential-amplification pressure difference detection unit, and makes operational analysis according to the received current value and ampere hour information acquired by the BMS communication unit and the test values of the differential-amplification pressure difference detection unit so as to make the electric energy transfer unit transfer the energy of battery cells. The method and the device of the invention have the characteristics of high equalization efficiency, accurate equalization current flow and high cost performance.

The invention provides an inhibitor-combined natural gas hydrate replacement mining method, and belongs to the technical field of marine natural gas hydrate mining. Firstly, a plurality of mining wells are drilled in a mining area to the interior of a natural gas hydrate mineral deposit, and each mining well comprises a vertical well section and a horizontal well section; during exploitation, an inhibitor is injected into a reservoir through an injection well, a pore channel is opened, the stratum permeability is improved, and then carbon dioxide is injected for replacement exploitation. Diffusion of the inhibitor and carbon dioxide between two mining wells is facilitated by controlling the pressure difference between the injection well and a collection well. In a replacement mining process, the inhibitor can prolong the generation time of carbon dioxide hydrate injected into the periphery of a shaft, so that the carbon dioxide diffusion distance is increased, the contact area of replacement reaction is increased, and the mining depth and efficiency are improved. The method is easy to implement, the replacement depth and speed can be greatly increased, and the method can be used for large-scale exploitation of natural gas hydrates.

A method for packing and/or mixing particulate materials, e.g., aerogel particles, includes combining materials having different particle sizes and applying a negative pressure differential in the presence of a sound field. A negative pressure differential in the presence of vibration also can be used. The method increases mixing and packing density.

The invention discloses a siphon circulation, contraflow heat regeneration and vapor compression distillation device, which utilizes siphon circulation to replace a circulation pump so as to drive feed liquid, and condensation latent heat can be cyclically recovered, so that the investment and the power consumption of the circulation pump are saved; contraflow heat regeneration and climbing-film evaporation of the feed liquid are commonly driven by the siphon circulation and outer pressure of a pipeline, so that evaporation latent heat is provided for generating secondary steam; large-temperature rise and small-temperature difference contraflow heat regeneration is adopted, so that not only is shell-pass evaporation pressure increased to a large extent, but also tube-pass condensation pressure is reduced to a large extent, the pressure difference, the emission and the power consumption of a water vapor compressor are reduced to a large extent, and the power consumption per ton water is reduced to 5 to 8 kW*h/t to a large extent; the falling head of the siphon circulation, contraflow heat regeneration and vapor compression distillation device is fully utilized, so that a condensed water discharging pump and a feed liquid discharging pump are omitted.

The invention provides a battery cooling system, a vehicle power exchange system and a battery cooling control method. The battery cooling system comprises a cooling liquid loop, a bypass branch and acontrol module, wherein the cooling liquid loop comprises a cold supply source, a liquid storage container, a power source and a plurality of battery cooling branches, the cold supply source, the liquid storage container and the power source are connected, the plurality of battery cooling branches are connected in parallel, a rechargeable battery is connected to the battery cooling branches underan application state, a first end of the bypass branch is connected with the cooling liquid loop between a downstream of the power source and an upstream of the battery cooling branches, a second endof the bypass branch is connected with the cooling liquid loop between a downstream of the battery cooling branches and an upstream of the power source, the bypass branch is controllably conducted ordisconnected, at least one part of cooling liquid passes through the bypass branch in a condition state, and the control module is used for maintaining pressure difference between an inlet and an outlet of each battery cooling branch within a preset zone by controlling on or off of the bypass branch. By the battery cooling system, the vehicle power exchange system and the battery cooling controlmethod, the battery cooling system can be maintained to stably work, and the rechargeable battery obtains a stable cooling effect.

The invention relates to a vacuum belt type dryer material dust continuous discharge system. The vacuum belt type dryer material dust continuous discharge system comprises a material buffer tank, a vacuum material feeder, a material discharge pipe, an air inlet valve and a material feeding valve, the material buffer tank is connected with a vacuum machine set through a vacuum pipeline, the passageof the vacuum pipeline is internally provided with an emptying valve and a filter, the filter is located between the emptying valve and the material buffer tank, the emptying valve is opened to makethe material buffer tank be in a normal pressure state, then the air inlet valve and the material feeding valve are opened, materials inside the material buffer tank are collected through the vacuum material feeder, after the materials are all collected, the emptying valve, the air inlet valve and the material feeding valve are closed, and the vacuum degree of the material buffer tank is restoredthrough the vacuum machine set. The vacuum belt type dryer material dust continuous discharge system has the beneficial effects that in the process of switching the emptying valve and a balancing valve in each cycle, because of continuous production of pressure differential air flow, converse blowing sweeping is performed on the filter, the filter is made to maintain the filtering effect at each cycle stage, the drying recovery rate of the materials is greatly increased, and the continuous running time of the vacuum machine set is guaranteed.

The invention relates to a variable capacity compressor. The compressor comprises a housing, a variable capacity cylinder and a lower flange assembly arranged below the variable capacity cylinder; thelower flange assembly is provided with a sliding hole communicating with a variable capacity chamber of the variable capacity cylinder, and the sliding hole is provided with a locking assembly that can be reciprocable in the axial direction thereof and lock a variable capacity sliding plate of the variable capacity cylinder; upper part of the locking assembly is communicated with lower part of the locking assembly through the variable capacity chamber and a variable capacity channel and with a constant pressure passage arranged on the housing. By adjusting air pressure values of the variablecapacity passage and the constant pressure passage, the variable capacity sliding plate can adhere to a lower roller under variable light operating conditions and under the action of high back pressure, which reduces fluctuation of the capacity and ticking sound; meanwhile, by reducing pressure difference between the variable capacity passage and the constant pressure passage, gas leakage from topto bottom of the locking assembly can be reduced, which reduces the impact and friction between the locking component and other components during state switching, thereby improving cooling efficiencyand cooling capacity as a whole, and increasing compressor reliability.

The hub-free wheel flange propeller comprises a main wheel flange, a first sliding groove is formed in the main wheel flange, a side wheel flange is connected to the outer side of the main wheel flange in an inserted mode, a connecting rod is fixedly connected to the outer side of the main wheel flange, a spoiler is fixedly connected to the outer side of the connecting rod, and a rotating shaft is rotationally connected to the interior of the main wheel flange; the outer side of the rotating shaft is fixedly connected with a centrifugal mechanism, an inserting hole is formed in the side wall of the main rim, and a locking mechanism is arranged on the inner side of the inserting hole. According to the hub-free rim propeller, the spoiler is arranged on the outer side of the rim, the arc length of the outer wall of the spoiler is larger than that of the inner wall of the spoiler, so that the flow speed of the outer wall face is higher than that of the inner wall face, the pressure of the inner wall face is higher than that of the outer wall face, the pressure difference generates force pointing to the outer wall face from the inner wall face, and the spoiler has small thrust; and the resistance of the underwater vehicle can be effectively reduced.

The invention relates to a medical gas replacement type mask. According to the medical gas replacement type mask, an electric control pressure difference driving type air convection structure is introduced, an air exhaust cavity is formed between an outer mask body (7) and an inner mask body (8) designed aiming at a mask body (1), the detection for the temperature and humidity of the inner side ofthe inner mask body (8) by a temperature and humidity sensor (13) is adopted as the basis, through a specifically designed fan speed regulating circuit (14), intelligent speed regulating control is carried out aiming at a miniature fan (3), based on air guide pipes (4) realizing butting communication between an air inlet of the miniature fan (3) and the air exhaust cavity, in combination with airexhaust through holes (9) in the inner mask body (8), and by utilizing the principle of air pressure differences, the damp and hot air at the inner side of the inner mask body (8) is rapidly taken away. The pressure difference between the inner side of the inner mask body (8) and the outer side of a gauze layer mask (6) is formed, through external injection through hole groups in the outer mask body (7) and the inner mask body (8), the injection towards the inner side of the inner mask body (8) of external air is realized, and the replacement of the air is realized.