39results about How to "Reduce driving pressure" patented technology

A flexible bore hole liner, such as may be used to line or seal a hole drilled into the earth's surface, and featuring a diffusion barrier to prevent undesirable cross-contamination during, for example, sampling of subsurface fluids. The sampling liner includes a flexible diffusion barrier so as to reduce diffusion transport of contaminant(s) into and / or out of the interior volume of a bore hole liner. This flexible diffusion barrier may be incorporated into the construction of a portion of known borehole liner systems. The diffusion barrier is attached by a suitable means to the liner and / or the “spacer” accompanying the liner. The diffusion barrier prevents diffusion into and / or out of the liner in the sampling interval subtended by the spacer length, preventing cross-contamination of fluid samples obtained by the liner systems currently in use.

The invention discloses a composite type air cleaner for pipeline descaling. The composite type air cleaner comprises a blade cleaning mechanism and a nozzle. The blade cleaning mechanism and the nozzle are connected into a whole through self-lock threads. The blade cleaning mechanism comprises inner-layer blades and outer-layer blades. The inner-layer blades and the outer-layer blades are staggered and stacked together. The nozzle is composed of an inlet cavity, a cavitation resonant cavity and small jet flow holes. Due to the fact that the cavitation mechanism is adopted for cleaning a pipeline, the cleaning efficiency is much higher compared with traditional cleaning ways. By the adoption of two-stage composition of the blade cavitation cleaner and the cavitation nozzle, the cavitation effect is improved compared with a single-stage cavitation cleaner. By the adoption of the composite type air cleaner, needed driving pressure is lower than 10 MPa, and the risk is lowered compared with traditional high-pressure water jet flow cleaning technology. The cavitation cleaner is simple in structure and low in manufacturing cost, and therefore the needed cost is lower compared with traditional PIG cleaning technology.

The invention discloses a photonic crystal optical fiber methane sensing device based on modular interference. The device is composed of a broadband light source, an optical circulator, a photonic crystal optical fiber methane sensor cladding an air hole coated polymer sensitive film, a testing air chamber, a switching valve, a quality flow controller, a spectrum analyzer and a computer, wherein the optical fiber methane sensor consists of a single mode fiber, a photonic crystal optical fiber and a welding area of the two fibers; the adopted photonic crystal optical fiber refers to an endless single mode solid core photonic crystal optical fiber; the polymer sensitive film refers to a polycarbonate resin methane sensitive film containing a cage molecule E-(OC2H5)6, and the inner wall of the cladding air hole of the photonic crystal optical fiber is coated with the film by virtue of an air pressure driving device; when the to-be-tested methane gas acts with the sensitive film on the inner wall of the cladding air hole of the photonic crystal optical fiber, the refractive index of the sensitive film changes, the reflection interference spectrum characteristic wavelength of the sensor is moved, the average movement amount shown in the description of the reflection interference spectrum characteristic wavelength before and after contacting the sensor with the methane gas is analyzed, so that the concentration of the to-be-tested methane gas can be obtained. The device disclosed by the invention has the characteristics of high sensitivity, high stability, high selectivity and the like.

The invention relates to a preparation method of a high-flux and low-pressure reverse osmosis membrane, and belongs to the technical field of separation membrane materials. In this method, a layer of nanoparticles is first constructed as an intermediate layer on the surface of the base film, and a transition layer with high porosity is constructed by the nanoparticles, and then a selective separation layer is prepared on the surface of the transition layer by the method of interfacial polymerization. With the high hydrophilicity and porosity of the nanoparticles, the permeation channel of water can be formed better, and the high-flux reverse osmosis process under the driving condition of low pressure can be realized.

The invention provides a kind of mini-type jet pump and its preparation method. The pump body includes drive structure and suck structure. The drive structure is made up of ejector nozzle, drive chamber connected to the ejector nozzle; the drive chamber is installed drive liquid inlet hole. The suck structure includes suck entrance end, suck interval channel, and diffusion exit. The ejector nozzle is installed at the diffusion exit; the suck interval channel is installed at the both sides of the ejector nozzle. The high pressure driving gas or liquid is entranced into drive chamber by the drive liquid inlet hole, and jetted with high speed at the exit of the ejector nozzle; as well as, the vortex is appeared at its boundary, the liquid in the suck interval channel is sucked by the vortex scroll to jet; the mixed liquid with the two different flow rate mixed liquid are both flowed into the diffusion exit. The preparation of the mini-type jet pump adopts MEMS technology design to realize by two piece photo etching plate; the selection range of the pump body material is large; and it is easy to integrate with most micro flow system.