195 results about "Surface filter" patented technology

This invention relates to the field of thermophotovoltaic (TPV) direct energy conversion. In particular, TPV systems use filters to minimize parasitic absorption of below bandgap energy. This invention constitutes a novel combination of front surface filters to increase TPV conversion efficiency by reflecting useless below bandgap energy while transmitting a very high percentage of the useful above bandgap energy. In particular, a frequency selective surface is used in combination with an interference filter. The frequency selective surface provides high transmission of above bandgap energy and high reflection of long wavelength below bandgap energy. The interference filter maintains high transmission of above bandgap energy and provides high reflection of short wavelength below bandgap energy and a sharp transition from high transmission to high reflection.

The invention provides a multi-carrier digital frequency-selecting remote system, which comprises a digital access control unit DAU and a digital radio remote unit DRU, wherein the digital access control unit DAU is connected with the digital radio remote unit DRU through optical fiber; the digital access control unit DAU comprises a DAU duplexer, a DAU downlink, a DAU photoelectric conversion subsystem, a DAU uplink, a DAU power subsystem and a DAU monitoring subsystem; the digital radio remote unit DRU comprises a DRU photoelectric conversion subsystem, a DRU downlink, a DRU duplexer and a DRU uplink; and the DRU monitoring subsystem and the DRU power subsystem are connected with the DRU uplink and the DRU downlink respectively. The system replaces a surface filter SAW with a digital intermediate-frequency processing technique in software radio, so as to keep a hardware platform unchanged, reduce the application of analog devices and guarantee the consistency of system performances while the number of carriers is increased / decreased at will.

A variety of improved hydroclone based fluid filtering systems are described. The hydroclones generally include a tank having an internal chamber and a filter (preferably a surface filter) that is positioned within the internal chamber. The filter defines a filtered fluid chamber within the internal chamber of the tank. The hydroclone may be operated such that a vortex of flowing fluid is formed between the chamber wall and the filter with the filter being located in the center of the vortex. With this arrangement, the filter acts as a cross-flow filter. In one aspect of the invention, the filter is a stepped filter. In another aspect of the invention, the filter is an surface filter, as for example, an electroformed metal surface filter. In some preferred embodiments, the openings in the filter are arranged as slots that extend substantially vertically so that they are oriented substantially perpendicular to the flow path of fluid flowing in the adjacent portion of the vortex. In another aspect of the invention, a circulating cleaning assembly is provided in the hydroclone region. The cleaning assembly is arranged to help clean the filter and is driven by the vortex of flowing fluid formed in the hydroclone region of the internal chamber. In yet another aspect of the invention, improved hydroclone intake structures are described. The described hydroclones may be used to filter water and other fluids in a wide variety of applications.

Window based matching is used to determine a depth map from images obtained from different orientations. A set of matching windows is used for points of the image for which the depth is to be determined. A provisional depth map is generated wherein to each point more than one candidate disparity value is attributed. The provisional depth map is filtered by a surface filtering wherein at least the z-component of a norm of a sum of unit vectors pointing from the candidate disparity values for neighboring points to a point of interest.

The invention relates to a dynamic evaluation instrument for high-temperature and high-pressure drilling fluid loss, which mainly consists of a circulating kettle, a stirring motor, a motor and temperature control system, a crack module, an intermediate container and a nitrogen source. The stirring motor is fixed on a top cover of the kettle, is hermetically connected with the circulating kettle and drives a rotating shaft and stirring blades in the circulating kettle to rotate, a gas inlet hole of the intermediate container is connected with the nitrogen source, a fluid drainage hole is connected with a fluid drainage valve of the circulating kettle, the lower portion of the circulating kettle is connected with the crack module, the crack module mainly consists of an upper column, a lower column and a heating plate, and rubber gaskets are placed in the middles of the upper and lower columns with grooves to form cracks. The dynamic evaluation instrument for high-temperature and high-pressure drilling fluid loss has the advantages that the dynamic evaluation instrument is high in automation degree and complete in function, the crack module is complete in type and large in size, drilling fluid filtering loss is monitored in real time and the like, and shortcomings that a conventional leakage stoppage device is small in size and scale, types of cracks are single, complex seam and hole loss cannot be simulated, crack wall surface filter loss cannot be tested, and positions of leakage stoppage blocking layers and permeability of the leakage stoppage blocking layers cannot be evaluated are overcome.

The invention discloses a method for judging a node region in a wireless sensor network chamber. The method comprises the following steps: determining which region does the mobile node belong to in a real-time manner for a point filtering mechanism and a surface filtering mechanism of RSSI information by reference to the RSSI information of an adjacent anchor node which is received by a mobile node to realize exact positioning of the mobile node while the mobile node moves among a plurality of regions. Therefore, an effective method is provided for positioning and tracking the mobile node while the mobile node moves among a plurality of regions.

The invention provides a single-layer meta-material surface structure capable of realizing angle-selective filtering through filtering frequency change and mainly solves a problem of inconvenient electromagnetic wave filtering angle adjustment in the prior art. A single-layer meta-material surface comprises multiple single-layer meta-surface slit units (2) arranged in a periodic mode, each single-layer meta-surface slit unit comprises a medium substrate (21) and a metal paster (22), the medium substrate (21) is prepared by employing a square organic high-molecular polymer substrate with thickness of 0.5-0.8mm and the relative dielectric constant of 2.65-4.4, the metal paster (22) is printed on the medium substrate (21), an annular slit which is vertically etched, is asymmetric and has double openings is etched on the metal paster (22), and the metal paster (22) is used for realizing angle-selective filtering under a single frequency band to make an electromagnetic wave filtering angle generate offset along with change of meta-surface filtering frequency. The surface structure is advantaged in that the structure is simple, processing is convenient, and the surface structure can be applied to design of a multi-function antenna cover.

The invention is applied to the field of dish-washing machines, and discloses a self-cleaning water flow system of a dish-washing machine and the dish-washing machine. The self-cleaning water flow system comprises a water cup with a filtering cavity and a water inlet cavity, a washing pump with a water suction pipe and a water discharging pipe, a water distribution valve cavity cover covering the water inlet cavity, a planar filter covering the filtering cavity, a cylindrical surface filter arranged in the filtering cavity rotationally and a filtering lifting cup extending into the cylindrical surface filter in a penetrating manner from the planar filter, wherein the water suction pipe is connected with the filtering cavity through a pipeline; the water discharging pipe is connected with the water inlet cavity through a pipeline; the water distribution valve cavity cover comprises a cover body covering the water inlet cavity and a water spraying pipe which is arranged in the filtering cavity in a manner of extending and penetrating from the cover body and is positioned beside the cylindrical surface filter; a plurality of water spraying holes facing to the cylindrical surface filter are formed in the water spraying pipe. According to the self-cleaning water flow system, water is sprayed to the cylindrical surface filter through the water spraying holes, so that the blockage resistance and the filtering capacity of the cylindrical surface filter can be improved, and the washing effect and the self-cleaning effect of the dish-washing machine are enhanced.

The invention discloses a dust accumulation detection method for a filter screen of an air conditioner. The air conditioner comprises a sound acquisition device used for detecting the air noise of anair outlet of the filter screen. The dust accumulation detection method for the filter screen of the air conditioner comprises the following steps that the air noise value of the air outlet of the airconditioner collected by the sound acquisition device is acquired; a preset wind noise threshold value is acquired; and when the wind noise value is smaller than the wind noise threshold value, the dust accumulation of the filter screen of the air conditioner is judged. The invention further discloses the air conditioner and a storage medium. According to the dust accumulation device, the air noise value of the air outlet of the air conditioner is collected through the sound acquisition device, and then the collected wind noise value is compared with a preset wind noise threshold value, and when the collected wind noise value is smaller than the wind noise threshold value, the air outlet of the surface filtering net is not smooth, and the amount of accumulated dust on the filtering net isjudged, so that the phenomenon that because the use duration of the air conditioner is long, whether dust accumulation of the filter screen is caused or not is avoided, and the accuracy of judging the dust accumulation amount of the filter screen is improved.

A sand control screen assembly (100) positionable within a wellbore (26) for filtering particulate matter out of production fluids. The sand control screen assembly (100) includes a perforated base pipe (102) that allows fluid flow therethrough and a filter medium (124) disposed exteriorly about the base pipe (102). A surface-modified agent is disposed on at least a portion of the filter medium (124). The surface-modified agent is operable to enhance the surface filter characteristics of the filter medium (124), thereby reducing particulate infiltration into the filter medium (124).

The invention relates to a structure and a molding method for directly molding a diaphragm on the core face of a filter plate. The structure comprises a filter plate core; the filer plate core is disposed in a lower mold frame; a decomposable mold core is arranged on the diaphragm face of the filter plate core; then a plasticized plastic lump is disposed on the diaphragm; an upper mold frame and the lower mold frame are combined and cooled to form an integrated single-surface plastic diaphragm filter plate; then the single-surface filter plate is turned over and disposed in the lower mold frame; the disposable mold core is arranged on the diaphragm face of the filter plate core; the plasticized plastic lump is then placed on the diaphragm face; the upper mold frame and the lower mold frame are then combined and cooled to form an integrated double-surface plastic diaphragm filter plate core.

The invention provides a self-adaptive filtering method for data of a pipeline magnetic flux leakage inner detector, and relates to the technical field of fault diagnosis techniques of pipelines. The method comprises the following steps that magnetic flux leakage signals are acquired by the pipeline inner detector, are amplified and stored, and are transformed into the actual digital voltage signals, the digital voltage signals are subjected to baseline correction, and then the abnormal data are searched, eliminated and compensated; the single-channel signal classification are conducted, and different types of signals are subjected to line filtering through corresponding single-channel self-adaptive filtering algorithms; the influence degree of noises between the adjacent channels is compared and analyzed to implement multi-channel equalization on the magnetic flux leakage signals; and the multi-channel signal area classification is conducted, and the different signal areas are subjected to surface filtering through corresponding multi-channel self-adaptive filtering algorithms. According to the method provided by the invention, the predication of the service life of the pipeline is more accurate, the feature is much easier to extract in the fault diagnosis of the pipeline, the filtering effect is more obvious, and the function of rapidly and accurately processing big data is achieved.

The invention provides a preparation method for a teflon membrane-coated filtering material. The preparation method comprises the following steps: separately pretreating a teflon membrane and a terylene spunbonded non-woven fabric; compounding the pretreated teflon membrane and the pretreated terylene spunbonded non-woven fabric so as to obtain a teflon membrane-coated filtering material precursor; and subjecting the teflon membrane-coated filtering material precursor to heat setting so as to obtain the teflon membrane-coated filtering material. A pretreatment method for the teflon microporous membrane comprises a first step of preheating the teflon microporous membrane and a second step of removing static electricity on the surface of the teflon microporous membrane. The invention has the following advantages: the terylene filter material prepared through hot pressing and compounding realizes surface filtering and has improved filtering efficiency, dynamically reaching 99.9995%, which is close to zero discharge; and the membrane-coated filtering material produced by using hot pressing and compounding technology can realize high-efficiency, low-resistance and long-life effect.

The invention relates to the technical field of lithography and provides an interference lithography system based on a spatial light modulator. According to the system, illumination beams transmitted from a light source become divergent light through a beam expander, the divergent light becomes parallel light through a collimating lens, the parallel light enters the spatial light modulator, the spatial light modulator performs image information modulation on the parallel light, a computer controls the spatial light modulator to display patterns, the parallel light becomes diffraction light after being subjected to diffraction splitting through the patterns displayed on the spatial light modulator, the diffraction light forms a spectral surface pattern on a back focal plane of a Fourier transform lens after passing through the Fourier transform lens, the diffraction light with required series is controlled to pass through by a Fourier transform spectral surface filtering baffle, and the diffraction light passing through the Fourier transform spectral surface filtering baffle is imaged with interference on a photoresist dry plate through an imaging mirror. The patterns displayed on the spatial light modulator are controlled through the computer, and the functions of image information modulation and diffraction splitting are simultaneously finished by the spatial light modulator.

The invention provides a self-cleaning type air filtering material and a preparation method thereof. The air filtering material comprises an inflow surface sub-micron fiber layer with a surface filtering effect, a supporting region with a supporting effect and a mixed region located between the sub-micron filter layer and the supporting region. The mixed region is formed when the sub-micron fiber layer and the supporting region are formed at one step via a double-layer headbox. The sub-micron fiber layer and the supporting region of the self-cleaning type air filtering material are combined in a natural interweaving mode, the self-cleaning type air filtering material has certain bonding strength and is not easy to be damaged and fall, sub-micron fibers realize high-precision filtering, simultaneously, particles filtered by the sub-micron fibers can be easily blown away via reversely blowing airflow, and accordingly a filtering performance is recovered. Accordingly, the air filtering material is quite applicable to a self-cleaning type filtering system.

The invention discloses a completely biodegradable polylactic acid fiber non-woven fabric filtering material. The filtering material consists of a polylactic acid fiber composite fiber net and a rigid finishing coating, wherein the composite fiber net consists of an upper-layer polylactic acid short fiber net and a lower-layer polylactic acid short fiber net with different linear density respectively, and the rigid finishing coating liquid comprises the following raw materials by mass percent: 10-20% of a rigid finishing agent, 8-15% of a water-proofing agent and 65-82% of water. A preparation method of the filtering material comprises the steps of firstly, enabling the polylactic acid short fiber to pass through two sets of cotton carding systems which are independent of each other to form the upper-layer composite fiber net and the lower-layer composite fiber respectively, wherein the upper-layer composite fiber net and the lower-layer composite fiber are independent of each other; secondly, feeding the two layers of the fiber nets into a high-pressure forward flow zone and reinforcing to form into a whole; and finally, rigidly finishing, drying, and winding. The filtering material can form the surface filtering mechanism with a density gradient structure, has the characteristics of being bacteriostatic, deodorant, good in efficiency, low in resistance, high in clogging capacity and easy to clean, and can be completely biodegraded after being abandoned.

The invention relates to a microfiltration cloth surface filtering water yielding method for a circular sedimentation tank, in which the water yielding is realized by a filtering system that mainly consists of a microfiltration cloth filter board (1) and an automatic cleaning device (2), wherein, the filtering system is provided with a plurality of microfiltration cloth filter boards which surround the periphery of the circular sedimentation tank and carry out the surface filtering of the sewage in the sedimentation tank, thus reducing the concentration of the suspending solids in the sewage to below 10mg / L;when the microfiltration cloth filter board is blocked up, the microfiltration cloth filter board is washed repeatedly by the automatic cleaning device, to resume the filtering function thereof. The method of the invention can improve water quality, and ensure the concentration of the suspending solids in the water to be lower than 10m / L; the method has the advantages of simple structure, convenience of installation and maintenance and low operation cost; and the backwash can be finished automatically and easily; the method can be used by old sewage treatment plant for improving the transformation of the yielding water quality standard and little changes can be done to the original technical equipment and construction; the phosphorus in the sewage can be effectively removed by using jointly with metal salt coagulant; besides, the chroma of the yielding water can also be effectively reduced.

The invention relates to the improvement of a dirt removal device for a fine grid. The dirt removal device is characterized in that a cylindrical filter screen is a rotary filter cartridge with a cover-shaped peripheral surface filter screen, and the rotary filter cartridge is rotated by rotating a central shaft; the peripheral surface filter screen is a woven mesh or a hole pattern plate; a spraying washing nozzle is formed outside and / or inside the top of the rotary filter cartridge; and an inclined dreg dropping groove which extends out of the width of the rotary cartridge is formed on the upper part of the inner circumference of the rotary filter cartridge. According to the dirt removal device for the fine grid, a large shell is eliminated, and a rake (brush) filter screen sweeping and dreg removal device is not needed to be arranged additionally, so that a structure is simple; and due to the rotation of the central shaft, the dirt removal device is reliable in running and is not maintained basically, and the woven mesh or the hole pattern plate prevents impurities from being clamped in pores, so that the defect that fine impurities on the grid filter screen are easily clamped in gaps is overcome, and the intercepted impurities are convenient to clean and separate. Simultaneously, dirt is not removed by using rake teeth, so the filter screen can meet the requirement of filter accuracy, holes or the gaps can be made to be fine arbitrarily, and the dirt removal device is particularly suitable for high-accuracy filtering.

The invention discloses a granular-bed gas filtering device comprising a casing and an air distribution device arranged in the casing. The granular-bed gas filtering device is characterized in that a granular layer is paved on the air distribution device; the grain diameter of the granular layer is 0.25-1mm; the thickness of the granular layer is 20-75mm; a powder body is paved on the granular layer; the powder grain diameter of the powder layer is 100-300mm; and the thickness of the powder layer is 0.5-25mm. The invention has the advantages that: the powder layer is paved on the granular layer, i.e. a powder layer filter film is additionally arranged on the surface of the granular layer and different from a dust filter film formed in the filtering process; firstly, the filter film is gradually formed in the filtering process and disappears after removing dust, and the filter film of the powder layer always exists during filtering and does not disappear after removing dust; and secondly, the characteristics of the dust filter film is decided by the characteristics of the dust to be filtered, and the characteristics and the thickness of the filter film of the powder layer can be optimally designed by selecting the powder body and the thickness of the powder layer according to the actual condition, therefore, with the filter film of the powder layer, a layer of surface filter film always exists on the surface of the granular layer so as to filter dust by powder and obtain extremely-high filter efficiency.

An automatic measuring system for a surface acoustic wave filter device is composed of a measurement fixture, a network analyzer, a GPIB-PCI switching circuit, a computer, a human-machine interface, and an I / O interface circuit which are connected. The filter device is inserted in the measurement fixture, and the network analyzer scans the filter device to acquire testing parameters; the acquired testing parameters are output by a GPIB interface of the network analyzer and read in the computer by the GPIB-PCI switching circuit; the testing of the filter device is finished by an algorithm which is built in the computer; and finally the testing result is output and stored, and the computer automatically finishes the output of a grading signal by the I / O interface circuit. The setting of the network analyzer can be changed by the human-machine interface, or the testing can be directly finished in the computer by selecting the testing parameters of the surface acoustic wave filter device. The automatic measuring system can simultaneously measure a plurality of parameters without personnel participation during the data testing for once, and has the functions of parameter setting, data analysis, data storage, diagram generation and printing. The grading output signal is provided to control a grading mechanism to grade products.

The invention discloses a multifunctional drink extraction device and an application thereof. The multifunctional drink extraction device comprises an external container and an internal container; theinternal container is arranged in the external container; the external container and the internal container are sheathed in a flexible manner; the external container comprises a closed bottom surface; the bottom surface of the internal container is provided with a bottom surface filter screen; the inner cavity of the internal container is separated into an upper hollow cavity and a lower hollow cavity by an intermediate filter net or a porous baffle; and a mechanical sealing device is arranged between the side wall of the external container and the side wall of the internal container. The device in the invention can be applied to the extraction or filtration of multiple types of drinks like coffee, tea, drinking water and the like.

The invention relates to a filtration system of a dish-washing machine. The filtration system comprises a plane filter, a cylindrical surface filter, a circulating filter, a water glass, a washing motor arranged at the outer side of the water glass and a drainage pump, wherein the plane filter and the circulating filter are respectively fixed on the upper end of the water glass; the cylindrical surface filter is fixed on the plane filter; the water glass is internally provided with a slag disintegrating cavity and a circling filtration pump cavity; the slag disintegrating cavity is communicated with an opening at the lower end of the cylindrical surface filter and a drainage pump cavity of the drainage pump; the slag disintegrating cavity is also internally provided with a slag disintegrating blade which is arranged on an output shaft of the washing motor and disintegrates food slag; the circling filtration pump cavity is communicated with the slag disintegrating cavity; a filtering net is arranged on a water inlet of the circling filtration pump cavity; the circling filtration pump cavity is internally provided with a circulating filtration pump arranged on the output shaft of the washing motor; the circling filtration pump cavity is communicated with a circulating filtration cavity of the circulating filter; and the circulating filtration cavity is communicated with the drainage pump cavity provided with the drainage pump. The filtration system can guarantee food slag not to be adhered to the filtering net, greatly promotes filtering effect and the self-cleaning capability of the whole filtering system, reduces energy and water consumption of the dish-washing machine, and increases the clearing rate of the dish washing machine.

The invention discloses a frequency division duplex device which comprises a receiving access and a transmitting access, wherein a low pass filter or a band-limiting filter is adopted as the transmitting access. In addition, the invention also provides a mobile terminal which comprises a wireless transceiver, a transmission surface acoustic wave (SAW) filter, a power amplifier, the frequency division duplex device and an antenna, wherein the wireless transceiver is used for receiving or sending signals, one end of the wireless transceiver is connected with an input end of the transmission SAW filter, and the other end of the wireless transceiver is connected with a receiving end of the frequency division duplex device; the transmission SAW filter is used for selecting the transmit frequency, and an output end of the transmission SAW filter is connected with an input end of the power amplifier; an output end of the power amplifier is connected with a transmitting end of the frequency division duplex device; the frequency division duplex device comprises the receiving access and the transmitting access; the low pass filter or the band-limiting filter is adopted as the transmitting access; and an external connecting end of the transmitting access is connected with the antenna. By adopting the way, the insertion loss of the duplex device can be effectively reduced, and the heat productivity of the mobile terminal can be effectively reduced.

The invention discloses a double-layer frequency selection surface wave filter with a frequency conversation function and relates to the technical field of microwaves. The problem that band pass wave filtering characteristics achieved by using a fixed satellite service (FSS) can not be changed in the prior art is solved. A high Q value characteristic of the wave filter is achieved through the adoption of a double-layer frequency selection surface. Ferroelectric material barium strontium titanate (BST) thin film is adopted as an interlayer of the double-layer frequency selection surface, metal layers of the double-layer frequency selection surface are adopted as a positive electrode of the BST interlayer and a negative electrode of the BST interlayer, different voltages are applied on the BST thin film through direct current voltage source, relative dielectric constant of the BST thin film is enabled to change along with change of the voltage, and therefore the frequency conversation function of the wave filter is achieved.

The invention discloses a production method of monopotassium phosphate. A production device comprises a feed calcium slurry tank (1), a reaction tank (2), a feed calcium slurry pump (3), a reaction slurry pump (4), a first automatic back washing surface filter (5), a primary evaporator (6), an impurity removal and desulfurization tank (7), a second automatic back washing surface filter (8), a slurry pump (9), a secondary evaporator (10), a mother solution pump (11), a crystallizer (12), a crystal mush pump (13), a flat plate scraper centrifuge (14), a drier (15), a methanol delivery pump (16), a methanol recovery storage tank (17) and a methanol condenser (18). With the adoption of the production device and a production technology flow, feed calcium hydrophosphate and potassium hydrogen sulfate generate replacement reaction, so that the content of a produced product can reach 98%, the cost is greatly lower than the production cost of a product obtained by a neutralization method production technology, and the production method is simple in technology and extensive in raw material source, and has broad market application prospects.

The invention provides an anti-blocking floor drain, comprising a body and a limiting layer. The limiting layer is fixedly mounted at the bottom end of the inner wall of the body; a rotary rod is rotationally connected to the middle of the limiting layer; the top of the rotary rod is sleeved with a surface filter net; a blade wheel sleeves the part below the middle of the rotary rod; blades are fixedly connected to the outside of the blade wheel; a cleaning wheel sleeves the part above the rotary rod; a cleaning rod is fixedly mounted outside the cleaning wheel; a rubber brush is tightly attached to the outer side of the cleaning rod; the top of the cleaning rod is provided with a clamp cavity; a lifting rod is embedded in the clamp cavity; a storage box sleeves the part above the middle of the cleaning rod; the outer side of the storage box is provided with a water outlet; a fine filter net is fixedly mounted above the storage box; a spraying layer is fixedly mounted on the inner wallof the body; the inner wall of the spraying layer is provided with spray holes. When water enters the anti-blocking floor drain, the cleaning wheel inside can rotate nonstop to clean hair, so that blocking of the floor drain is effectively prevented.

Fine gas bubbles traveling at fast speed are employed to scrub a hard-surface filter for harvesting liquids from suspensions including those consisting of nutrient media and cell culture, on a continuous basis without clogging the filters.