85results about How to "Meet filter requirements" patented technology

A high double-pass band temperature superconducting filter, including a microstrip resonator array, an input microstrip, and an output microstrip, is characterized in that by introducing cross-coupling between non-adjacent resonators in the microstrip resonator array, Realize the filtering characteristics of double passband; the advantage of the present invention is that it can meet the filtering requirements of the system for two non-adjacent frequency band signals, and has the characteristics of small size, compact structure, flexible design, etc.; it is suitable for high temperature super Conductive film production.

The invention aims at solving the problem of high cost of ethanol extraction of hemicellulose and provides a method for extracting the hemicellulose from plant fiber. The method is characterized by comprising the following steps of dissolving the plant fiber in an alkaline solution with the mass fraction of 5%-15%, then removing large particle impurities in the alkaline solution obtained by squeezing by adopting a conventional pre-filtration method, further enabling the alkaline solution to enter a ceramic membrane device through a pump to perform cross-flow filtration, adding an acid into an obtained concentrated solution for neutralization, collecting the precipitated hemicellulose, and drying to obtain the hemicellulose, wherein the alkaline solution after pre-filtration contains 50-100g / l of alkali and 40-60g / l of hemicellulose. The whole process basically adopts a pure physical method to extract the hemicellulose, the purity of the obtained hemicellulose is high, and the operation cost is low.

A four-model resonator-based compact dual-passband high-temperature superconductive filter is characterized by comprising an outer ring half wavelength hairclip resonator, an open circuit T type spiral branch, a first open circuit spiral branch, a second open circuit spiral branch, an input end and an output end; the open circuit T type spiral branch is arranged in the outer ring half wavelength hairclip resonator symmetrical about the open circuit T type spiral branch; the first and second open circuit spiral branches are arranged in the outer ring half wavelength hairclip resonator, and are symmetrical about the open circuit T type spiral branch; and the distance between the first open circuit spiral branch and the open circuit T type spiral branch is the same as that between the second open circuit spiral branch and the open circuit T type spiral branch; and the input end and the output end are in gap coupling with the outer ring half wavelength hairclip resonator. The four-model resonator-based compact dual-passband high-temperature superconductive filter can meet the communication system filtering demands on signals in non-adjacent wavebands, is small in size, simple and compact in structure, flexible in design and has an ultrahigh Q value.

The invention discloses an SMV and GOOSE message filter method based on an FPGA, belongs to the technical field of power system automation. According to the method provided by the invention, after the FPGA receives a frame of SMW or GOOSE messages completely through an internal MAC, MAC address filter is carried out firstly; then APPID filter is carried out; then CRC check code filter is carried out; after passing through the processes, ASN.1 decoding is carried out to the messages; key fields of the messages are extracted; legality check is carried out; finally secure bandwidth filter is carried out; and the messages passing through all the filter items are sent to a CPU for follow-up processing. Through the method provided by the invention, the difficulty of testing SMV and GOOSE message network pressures in a power automation device is solved; the system efficiency is further improved; and the hardware cost is reduced.

The invention discloses a solar blind ultraviolet optical lens and system. The lens comprises a first positive lens, a reflector with a central through hole, a negative lens and a second positive lens which are arranged from an object side to an image side. An ultraviolet waveband transmission film is coated on one surface, which is back to the reflector, of the first positive lens. One surface, which faces the reflector, of the first positive lens comprises a first emergent surface, a first reflecting surface and a second emergent surface which are arranged from the top to the bottom. The ultraviolet waveband transmission film is coated on the two surfaces of the negative lens. The ultraviolet waveband transmission film is coated on one surface, which faces the negative lens, of the second positive lens, wherein the ultraviolet waveband transmission film is a film system with high transmittance for 240nm-280nm and high blocking for 280nm-600nm. The system comprises the lens, an interference type ultraviolet optical filter and an image surface. The filtering function of the solar blind ultraviolet optical system is realized by performing film coating on different lenses of the optical lens with combined use of the interference type ultraviolet optical filter.

The invention aims to provide a heat-resistant composite glass fiber filter material and a preparation method thereof. The filter material has the characteristics of good filtering effect, good heat resistance, low production cost and long service life, and can meet the filtering requirements of cement kiln tails and similar working conditions. The technical scheme adopted by the preparation method of the heat-resistant composite glass fiber filter material in the invention is as follows: adopting glass fibers to prepare warps and wefts and preparing into filter cloth by using the warps and wefts, wherein the warps are obtained by infiltrating the glass fibers with polytetrafluoroethylene infiltration emulsion while the wefts are obtained by expanding.

The invention belongs to the technical field of reactors, and particularly relates to a swimming pool type regional low-temperature heat supply reactor which comprises a reactor core and a loop. The reactor core is arranged at the bottom of a reactor pool, and the depth of pool water in the reactor pool is 20-30 meters; an upper hanging basket, a middle hanging basket, a lower hanging basket and areactor core base are sequentially arranged in the reactor pool from top to bottom; drive wires of a control rod drive mechanism are arranged in the upper hanging basket, control rod guide barrels are arranged in the middle hanging basket, the reactor core is arranged in the lower hanging basket, the lower hanging basket is arranged on the upper side of the reactor core base which is fixed to thebottom surface of the reactor pool, and the reactivity of reactors is controlled by control rod clusters; the loop is communicated with the lower hanging basket, and heated pool water in the reactorcore can be delivered to the outside of the reactor pool via the loop, can be subjected to heat exchange and can flow back into the reactor pool. The swimming pool type regional low-temperature heat supply reactor has the advantages of high inherent safety level and reliability, economical efficiency and practicality.

The invention discloses a nested composite filter core. The nested composite filter core comprises a first-stage filter core and a second-stage filter core which are mutually and coaxially nested and have hollow cylinder shapes, wherein the first-stage filter core passes through and is arranged in the bore of the second-stage filter core, the first-stage and second-stage filter cores have a same height, and the external diameter of the first-stage filter core matches with the internal diameter of the second-stage filter core; and both ends of the first-stage and second-stage filter cores are respectively provided with a cover seal, and the cover seals of the first-stage and second-stage filter cores are tightly combined together through gaskets to form the composite filter core. Two different filter materials can be simultaneously provided when the composite filter core is used, so the two filter materials with different functions are combined together to realize a case that filter requirements of the two filter materials can be satisfied through only using a filter; and the two stage filter cores can be individually replaced, so the whole replacement of the filter cores is avoided, thereby the service life of the whole composite filter core is prolonged, and the use cost is reduced.

The invention discloses a laminated sheet type bypass wave absorbing device which comprises a first cover body, a middle layer and a second cover body, wherein the first cover body, the middle layer and the second cover body are sequentially laminated. The middle layer comprises a sheet type capacitor unit and a sheet type inductance function device unit which are laminated in parallel. The invention further discloses a manufacturing method of the laminated sheet type bypass wave absorbing device. The laminated sheet type bypass wave absorbing device and the manufacturing method can meet the wave filtering requirements in different frequency bands, and the slope of an insertion loss characteristic curve is steeper. Compared with a wave absorbing device with a single capacitor or a single inductor, the laminated sheet type bypass wave absorbing device can more effectively absorb noise waves in an electronic circuit and restrain electromagnetic interference of the electronic circuit, and the interference resistant capacity of an electronic device and the reliability of a system are improved.

The invention belongs to the technical field of papermaking, and relates to a nanofiber coated paper-based filter material and a preparation method thereof, wherein the nanofiber coated paper-based filter material comprises a base paper layer and a coating layer formed by coating and drying a coating liquid. The base paper layer is base paper, and the physical properties of the base paper are as follows: the quantification is 20-40 g / m<2>, and the tensile strength is 0.3 KN / m-1.0 KN / m; the wet strength is 15%-30%; the filtering efficiency is 50%-80%; the respiratory resistance is 30 to 70 Pa;the average pore diameter is 30 to 55 microns; the nanofiber coated paper-based filter material has the induction electrostatic voltage of 550-920 V and the filter efficiency of more than 90%. The nanofiber coated paper-based filter material is more environment-friendly than polypropylene melt-blown cloth, and meets the policy requirements of energy conservation, emission reduction and environmental friendliness at present.

The invention discloses a buoy water quality monitoring station. The buoy water quality monitoring station comprises a supporting body, a battery panel, a control box, a plurality of sensor mounting bins and a cavity, wherein the battery panel and the control box are arranged on the supporting body, the cavity is fixedly arranged under the supporting body, and the sensor mounting bins are annularly and evenly arranged on the periphery of the cavity; each sensor mounting bin comprises a sensor bin wall, a first cleaning air channel insertion hole, a sensor cable hole, a sensor sealing hole, a second cleaning air channel insertion hole and a plurality of cleaning air vent holes, wherein the first cleaning air channel insertion holes and the sensor cable holes are formed in the upper portionsof the sensor mounting bins, the sensor sealing holes and the second cleaning air channel insertion holes are formed in the middles of the sensor mounting bins, and the cleaning air vent holes are formed in the lower portion of the sensor mounting bins. The buoy water quality monitoring station has the advantages that the sensor mounting bins with annular and evenly-distributed structures are adopted, not only is the installation of sensors achieved, but also the requirements of filtering, cleaning and maintaining are satisfied.

The invention discloses a coal slime water solid-liquid separator and is characterized in that: the coal slime water solid-liquid separator includes a frame which is provided with drive rollers and corresponding driven rollers layer by layer, the drive roller and the driven roller at each layer are wound with filter screens which are in butt joint, the number of meshes of the filter screens is gradually reduced from the top layer to the bottom layer, and the drive rollers are dragged by a speed adjustable motor. When in work, solid particulate matter is gradually filtered layer by layer and falls from one side of the rotation advancing direction to be collected, the sewage which is filtered layer by layer and does not contain particulate matter flows away from under the screen and is recycled. The coal slime water solid-liquid separator of the invention has the advantages that coal slime water can be filtered by the device in time, no sedimentation tank is needed for precipitation, the occupy space is small, and the device has simple structure; generally, the filtering requirements can be met by arranging three rotating filter screens.

The invention discloses a manual pressurization type fast water purifier. The water purifier comprises a water storage barrel, and a filtration barrel is in threaded connection with the top of the water storage barrel; a second activated carbon filtration layer, a reverse osmosis (RO) filtration layer, a first activated carbon filtration layer and a PP cotton filtration layer are arranged in the filtration barrel from outside to inside; a pressure cylinder is fixedly connected to the inner bottom of the filtration barrel, and a plurality of one-way water outlets are uniformly formed in the bottom of the side wall of the pressure cylinder; an upper cover is in threaded connection with the top of the filtration barrel; a guide sleeve is fixedly arranged in the center of the top of the uppercover, a lifting rod is slidingly connected to the guide sleeve, a press plate is fixedly connected to the top of the lifting rod, and a reset spring is arranged between the press plate and the uppercover; the bottom end of the lifting rod is located in the pressure cylinder and fixedly connected with a pressure plate. According to the water purifier, pressure is provided downwards through the press plate, water can flow downwards rapidly, and the filtration speed is increased; meanwhile, by providing pressure, water can be conveniently filtered by the RO filtration layer, and the water purification effect is effectively improved.

The invention relates to a differential frequency circuit of plesio-digital signals and a differential frequency method thereof. The two plesio-digital signals are respectively connected with two input ends of a first mixer of the differential frequency circuit and also respectively connected with two input ends of a second mixer thereof by a phase-shift circuit of the differential frequency circuit. The differential frequency circuit of the plesio-digital signals and the differential frequency method thereof are technically characterized in that: the output ends of the two mixers are respectively connected to the two input ends of an adder; the output ends of the adder are connected with a filter and a shaping circuit in sequence; the differential frequency method conducts frequency-mixing processing on the two plesio-digital signals by the two mixers; the adder conducts analog adding processing for the mixed signals; and after output of the adder is processed by filtering and shaping, the adder outputs square wave signals with duty cycle of being close to 50 percent and uniform cycle. By adopting the adder behind the two mixers, the differential frequency circuit of the plesio-digital signals and the differential frequency method thereof remove parts of harmonic synthesis items which are close to the frequency of differential frequency in output of the mixers, thus providing a foundation for the measurement of high resolution and high accuracy of a plesio-digital signal output type sensor.

The present invention relates to a self-shielded low-pass filter module. The self-shielded low-pass filter module comprises a plurality of filter units, and each filter unit comprises an inductor assembly and a capacitor assembly; each capacitor assembly is provided with a groove, and the bottom of each groove is provided with a through hole; and the inductor assemblies are embedded into the grooves of the capacitor assemblies, the top portions of the inductor assemblies are connected with metal joints, the metal joints can be in cooperating connection with the through holes, and the bottom portions of the inductor assemblies are connected with the inner-side surfaces of the inductor assemblies. According to the invention, the inductor assemblies are inlaid in the capacitor assemblies so that while electromagnetic shielding is realized, space inside structural capacitors is fully utilized, and miniaturization and high-frequency suppression of a filter are realized. For the purpose of enhancing the filtering effect, multiple modules can be cascaded, the order of the filter is increased, while the filter is enabled to have steeper insertion loss characteristics, external plate layers can be connected with one another, good grounding and electromagnetic shielding are realized, the effect of inhibiting EMI noise radiation and conduction is quite good, and the performance and the application prospect are quite good.

The invention discloses a vertical cross-flow filtration integration device based on a hollow fiber membrane. The vertical cross-flow filtration integration device includes a pressure vessel, and is characterized in that a feed solution inlet is formed in one end of the pressure vessel, a concentrated solution outlet is formed in the other end of the pressure vessel, the pressure vessel is internally provided with at least one filter element integration assembly, the flow direction of feed liquid in the pressure vessel vertically bypasses the filter membrane surfaces of the filter element integration assemblies, the filter element integration assemblies are internally provided with filtered solution collection chambers, a filtered solution collecting pipeline is arranged on the lower partof a bottom plate of the pressure vessel, each filtered solution collection chamber communicates with the filtered solution collection pipeline, a filtered solution outlet is formed in one end of thefiltered solution collection pipeline, and a waste liquid discharge outlet is formed in the position, at one end of the concentrate solution outlet, of the pressure vessel. The vertical cross-flow filtration integration device based on the hollow fiber membrane has the advantages that the problem of pollution of the hollow fiber membrane is effectively reduced, the filtration efficiency of a membrane assembly is maintained, the effective utilization rate of an internal assembly of the hollow fiber membrane can be significantly increased, and the reuse cycle of the membrane assembly is prolonged.

The invention discloses a tee joint band high-temperature superconducting filter which is characterized by comprising two multi-branch-knot loading resonators, an incoming feeder and an output feeder. The first multi-branch-knot loading resonator (4) and the second multi-branch-knot loading resonator (5) are arranged face to face in a central symmetry mode. A distance exists between the two multi-branch-knot loading resonators. The output feeder (7) and the first multi-branch-knot loading resonator (4) form a feed structure of a gap coupler, and the incoming feeder (6) and the second multi-branch-knot loading resonator (5) form a feed structure of the gap coupler. According to the band high-temperature superconductivity filter, the three-frequency-band band-pass filtering function can be achieved, the requirement of the system for filtering on three frequency band signals which are not adjacent is met, control of the bandwidth of the filter can be achieved, an extra transmission zero can be led to a stop band of the filter, and the characteristics of the stop band of the filter are effectively improved. The tee joint band high-temperature superconductivity filter is compact in structure, small in size, flexible in design, easy to integrate, suitable for manufacturing high-temperature superconducting thin films with a high quality factor.

The invention discloses a polyamide filter element obtained through sweat soldering and a manufacturing method thereof. The polyamide filter element comprises an end cover, a lower end cover and a polyamide filter material. The polyamide filter material is of a hollow cylinder structure formed by processing polyamide materials through a melt-blowing technology, and bonding and twining blown-out superfine cellosilk. The filter material is of a loose structure and is provided with filter holes of different hole diameters. The hole diameter of the filter holes is gradually decreased from the outer layer to the inner layer of the cylinder structure. The upper end cover and the lower end cover are welded to the two ends of the filter material through a hot-melt technology. The at least one of the upper end cover and the lower end cover is provided with an oil outlet hole. The filter element has the good filter precision, pollutant carrying capacity and flow resistance parameters on the premise of ensuring that the material has the oil resistance and alcohol corrosion resistance, non-glue connection is achieved by adopting the sweat soldering scheme, and the filter requirements of oil products, chemical waste liquid and chemical waste gas are met.

The invention discloses a universal rotation type filter utilizing a polyamide filter element. The universal rotation type filter comprises a shell and the filter element arranged in the shell. The filter element comprises an upper end cover, a lower end cover, filter paper and a polyamide melt-blown filter material. A thread connecting plate is arranged at an opening part of the shell. A plurality of oil inlet through holes are formed in the periphery of a thread connecting plate thread through hole. An oil product entering from a filter base oil inlet pipe enters the part between the shell and the filter element through the oil inlet through holes of the thread connecting plate. A plurality of symmetrically-distributed protruding teeth are arranged on the outer edge of the thread connecting plate. Grooves matched with the protruding teeth are formed in the opening part of the shell. The circumferential size of the protruding teeth is smaller than that of the grooves. A supporting structure is arranged at the bottom of the shell, and under the effect of the supporting structure, the thread connecting plate is pressed and attached to the part between the opening part of the shell and a filter element oil outlet. The universal rotation type filter solves the problem that a filter element in an existing filter shell cannot be replaced, has the beneficial effects of being high in dirt containing capability, high in filtering precision and the like, and is suitable for filtering of various oil products.

The invention discloses a filter circuit, an automatic tuning circuit, a filter adjusting circuit and an adjusting method. The filter circuit is simple and reasonable in structural design, can reduce the occupied area of a chip, has a multi-channel selection function, and can meet the requirements of high broadband gain, low power consumption and the like at the same time. The filter circuit structure comprises a third-order reconfigurable gm-c complex band-pass filter circuit, a reconfigurable bias circuit structure, an automatic tuning circuit structure and an integral structure, wherein the automatic tuning circuit is connected with the third-order reconfigurable gm-c complex band-pass filter through the reconfigurable bias circuit; the integral structure automatic tuning circuit is used for generating a resistor array control word to control the reconfigurable biasing circuit, and the reconfigurable biasing circuit is used for generating bias voltage used by the third-order reconfigurable gm-c complex band-pass filter. The invention further discloses a method for adjusting the center frequency and bandwidth of a third-order reconfigurable gm-c complex band-pass filter by applying a reconfigurable biasing circuit structure and an automatic tuning circuit.

The invention discloses a microbial fermentation device for sewage treatment, which comprises a sewage tank, a microbial fermentation device, a purified water collection tank and a water pump which are sequentially connected through a pipeline to form a closed loop, and the top end of the sewage tank is connected with the water pump through a pipeline. The bottom end of the sewage tank is connected with the microbial fermentation device through a pipeline, and a water inlet is formed in the upper part of the sewage tank. By combining the sewage tank, the microbial fermentation device, the purified water collection tank, the water pump and other structures, sewage can be effectively fermented, and when one-time fermentation treatment of the sewage cannot meet the requirements of people, water in the purified water collection tank can be pumped into the sewage tank through the water pump for repeated filtration and fermentation until the filtering requirements are met, intercepted organic impurities and other materials can be used as organic fertilizer raw materials after high-temperature fermentation, secondary pollution is avoided, and installation and debugging are convenient.

The invention relates to a fuel oil tank with an external circulation filtering device and a fuel oil engine. The fuel oil tank with the external circulation filtering device comprises an oil tank body and a filtering device arranged outside the oil tank body, the filtering device comprises a hydraulic pump, a filter, an oil extraction pipe and an oil return pipe, and the oil extraction pipe and the oil return pipe are arranged on an oil tank shell; and fuel oil is sucked in from the oil tank body through the hydraulic pump and is filtered through the filter to be discharged to the oil tank body through the oil return pipe, and a filter element of the filter is a polyamide melt-blow filter element. When an oil product is polluted or every a certain time, the fuel oil in the oil tank body is circulated and filtered, so that pollutants, such as metallic oxide, separated-out colloid and asphaltene generated by long-time placement, in the oil product are eliminated; and meanwhile, when the oil tank is used for the engine, pollutant discharge of the engine can be reduced, fuel consumption is reduced, and faults of the engine are reduced. Meanwhile, when the engine does not work, the oil product is repeatedly purified, the quality of the oil product is guaranteed, the combustion efficiency of the engine is improved to the maximum degree, and pollutant discharge is reduced.

The invention discloses a universal spin-on filter adopting a two-stage integrated composite filter element, which includes a shell and a filter element arranged inside the shell. The filter element includes an upper end cover, a lower end cover, filter paper and polyamide melt blown The mouth of the shell is provided with a threaded connecting plate, and a number of oil inlet through holes are arranged around the threaded through hole of the threaded connecting plate, and the oil entering the oil inlet pipe of the filter seat enters the shell and Between the filter elements; the outer edge of the threaded connecting plate is provided with a number of symmetrically distributed protruding teeth, and the mouth of the housing is provided with a groove matching the protruding teeth. The circumferential scale of the protruding teeth is smaller than that of the groove. The bottom of the body is provided with an elastic support, and under the action of the elastic support, the threaded connecting plate is pressed between the mouth of the housing and the oil outlet of the filter element. The invention solves the problem that the filter element in the existing filter housing cannot be replaced, has the characteristics of strong dirt holding capacity, high filtering precision, and is suitable for filtering various oil products.

The invention provides a vacuum filter, which is characterized in that a mass of filtering of fluid solution such as a tissue culture solution can be completed by an operator without a clean room, cleanliness degree is ensured, the experiment flow is shortened, and the work efficiency of the operator can be increased. The vacuum filter comprises an upper cup and a lower reception bottle, the upper part of the upper cup is provided with a lid, the vacuum filter is characterized in that a filtering apparatus is arranged between an lower outlet of the upper cup and an upper inlet of the lower reception bottle, the inlet of the filtering apparatus is connected to the lower outlet of the upper cup, the outlet of the filtering apparatus is communicated with the upper inlet of the lower reception bottle, a filter membrane is arranged in the filtering apparatus, a pipe joint is arranged at the side part of the filtering apparatus, one end of the pipe joint is communicated with an internal cavity of the filtering apparatus, and the other end of the pipe joint is externally connected to a vacuum pump.

The invention discloses a metallurgical method utilizing a separation device. The metallurgical method comprises a fixed housing, wherein the upper side of the inside of the fixed housing is providedwith a material storage tank with an upward opening, the left side of the lower end wall of the material storage tank is provided with a grinding space, a grinding device is arranged in the right endwall of the grinding space, the lower side of the inside of the fixed housing is provided with a separation space, the inner wall of a discharging hole is provided with a closing device in linkage with the grinding device, the upper side of the inside of the separation space is provided with a first filter screen, and the lower side of the inside of the separation space is provided with a knockingdevice. In work, the grinding effect of the device is improved, accordingly the requirement for powder grains in the sintering process is met, a control system is omitted through linkage and cooperation of the devices, the cost of the devices is reduced, the requirement for filtering different grains is met, the functions of the device is more diversified, and the phenomenon can be prevented thatgrains are clamped in filter holes and accordingly device blockage is caused.

The invention discloses a two-stage integrated composite filter element for oil product filtering.The two-stage integrated composite filter element comprises an upper end cap, a lower end cap, a framework, folding filter paper and a polyamide filter material, the framework comprises an inner protection tube and an outer protection tube which are arranged coaxially, the upper end cap and the lower end cap are fixed at two shaft ends of the folding filter paper and the polyamide filter material, at least one oil outgoing hole is formed in each of the upper end cap and the lower end cap, the folding filter paper is connected on the outer ring of the inner protection tube in a sleeved manner, the polyamide filter material is connected on the outer ring of the outer protection tube in a sleeved manner and obtained by treating a polyamide material through a melt-blowing process, superfine fibers which are melt-blown out are made into polyamide melt-blown nonwoven cloth through mutual binding and winding, the polyamide melt-blown nonwoven cloth is of a loose structure, and filter holes different in hole diameter are formed in the polyamide melt-blown nonwoven cloth.The two-stage integrated composite filter element is ensured to be resistant to oil and alcohol corrosion, has high filtering accuracy, pollution bearing capability and oil-water separating capability and meets filtering requirements of common oil products.

A combined corner feeding chamber-type filter plate and a liquid discharge method thereof are provided. A main plate and an auxiliary plate are set into an assembly; two sides of the main plate are provided with outer lugs, each outer lug is provided with a corner feeding passage, a feeding hole connected with the corner feeding passage, a distribution hole connected with the feeding hole and filter chambers on two sides of the combined filter plate, a hidden flow hole and a liquid outlet connected with the hidden flow hole, a rubber seal ring is disposed at each corner feeding passage and the corresponding hidden flow hole, the auxiliary plate matches with the main plate in appearance and size, and drain holes are arranged in each filter chamber; the liquid discharge method is characterized in that the liquid outlets are connected to the drain holes in the lower corners of the filter chambers at the lower ends of the corner feeding passages of the main plate in order to discharge filtrate through the hidden flow holes, the liquid outlets are connected to the right lower corners of the lower ends of the filter chambers of the filter plate in order to discharge filtrate through the hidden flow holes, each filter plate assembly needs to be symmetrically mounted according to the lower liquid outlets for discharging, filter drain structure is of pressure fusion form, and discharging is of symmetric distributary form.

The invention discloses a combined exhaust valve group with filtrating and backwashing functions. The combined exhaust valve group comprises a main exhaust valve, wherein a service valve is in communication connection with the inlet of the main exhaust valve, a filter screen is arranged between the inlet of the main exhaust valve and the service valve, a reverse water inlet is formed in a valve body of the inlet end of the service valve, an impurity outlet is formed in the valve body of the outlet end of the service valve, and a trace exhaust valve and the reverse water inlet are communicated with a valve body cavity of the main exhaust valve at the rear end of the filter screen through a pipeline. The filter screen arranged between the inlet of the main exhaust valve and the outlet of the service valve is used for filtering impurities in a pipeline, water in the pipeline is reversely accessed to the interior of the main exhaust valve through the reverse water inlet of the service valve so as to backwash the filter screen, and the impurities are discharged from the impurity outlet through the pipeline, so that the blockage-proof function is realized.

The invention provides a novel cylindrical external compression ultrafilter membrane assembly. The novel cylindrical external compression ultrafilter membrane assembly comprises an external coarse filtering unit, an upper end closure unit, a lower end closure unit, and an ultrafilter membrane cluster combination filtering unit and an aeration hole arranged in the external coarse filtering unit; two ends of the external coarse filtering unit are connected with the upper end closure unit and the lower end closure unit respectively; the upper end closure unit is provided with an upper water outlet tube, a gas discharging tube and an ultrasonic device interface, and the lower end closure unit is provided with a water outlet tube and a gas inlet tube; water outlets at two ends of the ultrafilter membrane cluster combination filtering unit are connected with the upper water outlet tube and the lower water outlet tube respectively; and gas holes are arranged at the bottom of the gas discharging tube of the upper end closure unit and the bottom of the gas inlet tube of the lower end closure unit respectively. The ultrafilter membrane assembly has the advantages of compact structure, small occupied area, use convenience, flexible operation, wide application range and good popularization application prospect.

The invention discloses a polyamide filter material. The filter material adopts a hollow cylindrical structure produced through melt-blowing process treatment of a polyamide material and adhesion and winding of blown superfine fibers; the filter material adopts a loose structure and filter holes with different hole diameters are formed; the hole diameters of the filter holes sequentially and gradually decrease from the outer layer of the cylindrical structure to the inner layer. The characteristic that the polyamide material is resistant to corrosion by multiple chemical raw materials is used, melt-blowing process treatment is performed, the structure identical with that of a common polypropylene filter element is obtained, on the premise that oil and alcohol corrosion resistance of the material is guaranteed, the filter material has better filter precision, pollutant-holding capacity and circulation drag parameters, and the filter requirement of oils, chemical waste liquor and chemical waste gas is met.