239results about How to "Achieve reflow" patented technology

The invention discloses a sewage treatment method and a system in ecological sensitive areas. The method comprises the following steps: larger suspended matters in sewage are removed by using a collecting well the inlet of which is provided with a mechanical coarse screen, the treated sewage enters a pretreatment tank, the suspended matters are further removed by the coarse screen, animal and vegetable oils and mineral oils are removed by an oil separator, and the retreated sewage enters a regulating reservoir to equalize the water quantity and water quality; the pretreated sewage enters an anaerobic tank to be mixed with backflow mixed liquor from an anoxic tank; effluent from the anaerobic tank and the backflow mixed liquor from a membrane pool are mixed to enter the anoxic tank, and effluent from the anoxic tank enters an aerobic tank; effluent from the aerobic tank enters the membrane pool to be biodegraded; and the effluent is filtered by membranes. By adopting an anaerobic-anoxic-aerobic-MBR mode, the invention has higher treatment efficiency and stability and can effectively remove COD, BOD, TN, TP and oils in the sewage; and the effluent meets first grade A emission requirements, and can be used as a reuse water source, thereby protecting the environment and saving the water resources. The invention is especially suitable for treating rural domestic sewage and catering wastewater in the ecological sensitive areas.

The invention provides a method and a system for treatment and recycling of feces and waste from livestock and poultry culture. The system comprises a waste water organic matter accumulating system, an anaerobic fermentation system, a sludge return system and a waste water recycling system. The method comprises the following steps: based on the characteristic that active sludge can highly absorb organic matters in waste water, accumulating the organic matters in the waste water from livestock and poultry culture; generating methane by anaerobic fermentation of sludge enriched with high-concentration organic matters together with dried feces so as to realize the recycling of biomass energy; and further treating low-concentration waste water after enrichment of organic matters by using constructed wetland and a sterilization method to meet water quality standards and to realize zero discharge of waste water. In addition, part of sludge in a sedimentation tank and biogas residues generated by anaerobic fermentation are returned and aerated in a regeneration tank to recover the high absorption activity so as to circularly absorb the organic matters in the waste water, thereby realizing recycling of the sludge and the biogas residues. The method and the system realize the treatment and recycling of feces and waste from livestock and poultry culture as well as recycling of biomass in the waste water and zero discharge of the waste water, and have the advantages of simple structure, low investment and operation cost, high treatment efficiency and the like.

The invention relates to a multilevel rotational flow combined type air atomized fuel nozzle device and a control method thereof. The device is applied to a high temperature rise combustor. A head swirler comprises a central duty level unit and a peripheral primary combustion level unit, a two-level axial swirler structure is adopted by the central duty level unit, an oil membrane generated by duty level fuel oil is atomized under the shearing action of the rotational air of the inner level and the outer level of the duty level, an oil-rich diffusive combustion mode is formed in the duty level, and the problem that the combustion is unstable under small power due to the fact that the gas quantity is large in the head portion of the high temperature rise combustor is avoided; the primary combustion level is of a combined type swirler structure of two-level reverse rotation of weak swirl design, primary combustion fuel oil is sprayed toward the downstream of an axial swirler blade channel of the outer level of the primary combustion level through multiple fuel oil spraying holes, after being atomized and mixed by the rotational air of the inner level and the outer level, the fuel gas in a primary combustion level premix channel is distributed uniformly, and the problem of exhaust smoke at a combustor outlet under the high power of the high temperature rise combustor is avoided.

The invention discloses an aerobic inner loop reflux typed immobilized microbe fluid-bed reactor, which comprises the following parts: sediment area, reacting area, depositing area from upwards to downwards, wherein the sludge hopper is set in the depositing area with water distributor on the top; the support pipe is set on the water distributor with reflective board on the upper end; the fixed microbe fill and inner circulation reflux pipe are set in the reacting area; the first and second hopper typed baffles are set on the upper end of inner circulating reflux pipe; three-phase separator is set on the connecting part of first hopper typed baffle and reactor bulk, which connects the second draining pipe, second gas rotor flow meter and second needle valve and water tank through gas chamber; several sampling holes are set on the external wall of reactor bulk, which connects outlet pipe, liquid rotor flow meter, second stop valve and outlet tank through U-shaped pipe.

The invention relates to a deep treatment method of garbage leachate, which is characterized in that (1) the garbage leachate, positioned in a denitrification pool, is made to have denitrification reaction by continuous push flow; (2) then the garbage leachate in the denitrification pool flowing into a nitrification pool is made to have nitrification reaction by continuous jet and blast aeration; DO is controlled from three to five mg / L; (3) the nitrified garbage leachate, flowing into a denitrification pool positioned behind, is made to have denitrification reaction by continuous push flow and the addition of carbon source; the concentration (mg / L) ratio of the carbon source and nitrate nitrogen ranges from two point zero to one, to four point five to one; (4) the wastewater after denitrification in the denitrification pool positioned behind is transported into a tubular ultrafilter; then the solid and the liquid of the wastewater are separated by the membrane component of the ultrafilter; clear liquid is transported to a nanofiltration device; concentrated liquid reflows into the denitrification pool; (5) the clear liquid after ultrafiltration is transported to a nanofiltration device; clear water is exported after the clear liquid is filtered by the membrane component of the nanofitration device. The deep treatment method of garbage leachate has the advantages of increasing the removal rate of ammonia nitrogen and total nitrogen.

The invention discloses an open-cycle liquid oxygen kerosene engine system and a use method. The system uses low-cost liquid oxygen and kerosene as propellants to meet starting and ignition functionsof an engine, reduce the production cost of the engine, and meet requirements of non-toxic rocket launch at the same time. The engine system adopts a turbine, a kerosene pump and an oxidant pump, wherein the turbine, the kerosene pump and the oxidant pump are coaxially arranged; an inlet of the oxidant pump communicates with an oxidant supply source, an inlet of the kerosene pump communicates withthe kerosene supply source, and an outlet of the oxidant pump and an outlet of the kerosene pump communicate with a thrust chamber; a gunpowder starter is arranged on the turbine; the turbine communicates with a gas generator through a pipeline, an exhaust pipe is arranged on the turbine, and a pyrotechnic igniter is installed on a head part of the gas generator; one end of an oxidant output secondary pipeline communicates with an oxidant output main pipeline, the other end of the oxidant output secondary pipeline communicates with the gas generator; and one end of a kerosene output secondarypipeline communicates with a kerosene output main pipeline, and the other end of the kerosene output secondary pipeline communicates with the gas generator.

The invention discloses an assembly line for circulating carriers. The assembly line comprises an upper layer assembly line and a lower layer assembly line which are arranged up and down, and transferdevices respectively arranged at two ends of the upper layer assembly line and the lower layer assembly line; the upper layer assembly line is used for successively transferring a plurality of carriers to all work stations at intervals in a first transfer direction; the lower layer assembly line is used for transferring all carriers in a second transfer direction, wherein the first transfer direction and the second transfer direction are opposite; the transfer device is used for transferring all carriers between the upper layer assembly line and the lower layer assembly line; a plurality of work stations are uniformly distributed on the upper layer assembly line, and each of the work stations comprises a barrier climbing mechanism; and the carrier climbing mechanism is used for blocking the carriers transferred to all work stations to the corresponding work stations, and climbing the carriers to a height of at least one carrier. With adoption of the assembly line, automatic transfer and backflow of the carriers can be realized, the transfer of other carriers is not influenced when one carrier is transferred to one work station.

The invention discloses a recycling method of circulated cooling water of industrial wastewater with carbinol, which comprises the following steps: adopting hydrolytic adjusting pond; proceeding microbe contacting to oxidize; proceeding aerobic biological contact to oxidize; concreting; sedimenting; filtering through active charcoal; sterilizing through UV; adopting elastic cubic fill and microhole aerating system as fill of biological contact oxidizing course; decomposing organism with DO under 0.5-1. 0mg / l; removing CODcr, suspension and organism effectively.

The invention relates to a water treatment device, in particular to a water treatment device integrating functions of clarification, air flotation and ultrafiltration, which solves the problems of long treatment scheme and high operating cost of the existing water treatment device. In the invention, ultrafiltration membrane components are symmetrically arranged in two separation areas of a cell body, aerator pipes are arranged below the ultrafiltration membrane components and at the bottom of a coagulation area, and a plurality of turbine agitators are evenly distributed in the coagulation area back and forth; and the turbine agitators are used for realizing mechanical clarification, the aerator pipes are used for carrying out aeration on the cell body, and the ultrafiltration membrane components are used for carrying out ultrafiltration. The water treatment device of the invention integrates the functions of clarification, air flotation and ultrafiltration and has short treatment scheme and low operating cost.

The invention discloses a jig backflow mechanism and a working method of the jig backflow mechanism. The jig backflow mechanism comprises an upper-layer conveying mechanism, a lower-layer conveying mechanism, a servo motor driving mechanism, a first lifting mechanism, a second lifting mechanism and a compaction mechanism. Jigs can move in circles between the upper-layer conveying mechanism and the lower-layer conveying mechanism, the upper-layer conveying mechanism conveys the jigs to working stations, and the jigs are returned from the discharge side to the feeding side through the lower-layer conveying mechanism. The jigs are driven by a servo motor and a ball screw mechanism to be transferred, and the jig backflow mechanism has the advantages of being high in positioning precision and high in speed. The jig backflow mechanism achieves jig backflow transfer through the two lifting mechanisms, and has the characteristics of being high in efficiency and high in precision. The whole system achieves jig backflow through a belt assembly line mechanism.

The invention discloses an integrated recycled water treatment device. The device comprises a regulating tank, an aeration grille, an air floating tank, an anaerobic tank, an aerobic tank, a settling tank, a filter tank, a disinfection tank and a siphonic mud discharge pipe, wherein the aeration grille is arranged at a water inlet of the regulating tank; the air floating tank is arranged at the upper end of the regulating tank; one end of the siphonic mud discharge pipe is arranged in the regulating tank, and the other end of the siphonic mud discharge pipe is arranged at the bottom of the settling tank; and the sewage to be treated firstly flows through the aeration grille, then is pumped to the air floating tank by a lifting pump, and sequentially flows through the air floating tank, the anaerobic tank, the aerobic tank, the settling tank, the filter tank and the disinfection tank of which the highest liquid level differences are successively reduced. Sludge settled at the bottom of the settling tank in the integrated recycled water treatment device can be pumped to the inside of the regulating tank by the siphonic mud discharge pipe, thereby ensuring the quality of the water discharged from the integrated recycled water treatment device. According to the integrated recycled water treatment device disclosed by the invention, the backflow of sludge in the settling tank is realized through the siphonic mud discharge pipe, and the sewage treatment load of the device is improved.

The invention relates to the field of machining and particularly discloses a punch die fast replacing device. The punch die fast replacing device comprises a hydraulic table and a rack. The hydraulic table is arranged at the upper end of the rack and is vertically and slidably connected with the rack; the lower surface of the hydraulic table is parallel to the horizontal plane; a machine table is fixedly mounted at the lower end of the rack; an upper die is detachably mounted on the lower surface of the hydraulic table; a rotary shaft rotationally connected with the machine table is horizontally arranged on the machine table; a plurality of different types of lower dies are mounted on the rotary shaft circumferentially; the upper die faces the rotary shaft; and the axes of the lower dies are perpendicular t to the axis of the rotary shaft. The punch die fast replacing device further comprises a first motor and a first driving gear which are both arranged at the lower end of the rack; the first driving gear is fixedly connected with the power output end of the first motor; and first transmission teeth engaged with the first driving gear are disposed at the end, close to the rack, of the rotary shaft. By means of the scheme, fast replacement of the lower dies can be achieved.

The invention relates to a method for realizing vertical flow of A20 process of sewage treatment and a structure thereof. The structure consists of an anoxic area, an anaerobic area, an aerobic area and a sediment area in accordance with three large stereostructure of concentric circle. A backflow seam is arranged on the outer wall of the anoxic area, and a lift agitator and an aerating apparatus are further arranged. Pools adopting the normal A20 process are organically integrated by a stereo way to realize backflow of water and active sludge through the lift agitator and the backflow seam, thereby realizing circulation of water and active sludge in anoxic, anaerobic, aerobic processes, achieving the purpose of removing BOD5, ammonia nitrogen, total nitrogen and total phosphorus without configuring two sets of reflux pumps the same as the normal A20 process and solving the problems that a plurality of pools of the normal A20 process are arranged, the structure is loose with large occupied area and a plurality of backflow lines and valves are needed. Sewage treatment engineering medium and small water yields can be very flexibly used, thereby improving the effluent quality and enlarging the application range of the A20 process.

The invention discloses a jig circulation assembly line and a jig backflow device. The jig backflow device comprises a feeding mechanical hand, a conveying structure and a vertical lifting structure,wherein the feeding mechanical hand is arranged at the input end of the conveying structure, and is used for putting jigs on the conveying structure; the conveying structure is sequentially divided into a rising section, a straight section and a slow descent section from the input end to the output end; the rising section, the straight section and the slow descent section are of belt transmissionstructures; the rising section of the conveying structure is upwards obliquely arranged; the straight section of the conveying structure is horizontally arranged; the input end of the straight sectioncorresponds to the rising section; the output end of the straight section corresponds to the slow descent section; the slow descent section is downwards obliquely arranged; and the vertical lifting structure is arranged at the output end of the conveying structure, and is used for receiving the jigs conveyed by the conveying structure and moving the jigs to a working platform. According to the jig backflow device, the structure is simple, operation is convenient, long-distance assembly line jig backflow can be achieved, jig input is reduced, manpower resource input is reduced, production efficiency is improved, and production cost is reduced.

The invention provides a diversified heterogeneous data cleaning method for load prediction of a power grid. The method comprises the following steps that the distribution characteristic of operation data of diversified heterogeneous equipment is analyzed to obtain effective operation data; the effective operation data is subjected to data recognition processing to obtain a complete data source; the complete data source is subjected to standardization processing to obtain a clean data source. By means of the diversified heterogeneous data cleaning method for load prediction of the power grid, the data quality can be effectively improved, and then the accuracy of load prediction of the power grid can be improved.

The invention relates to a silencer for a motor device, which especially for manual control small tools, e.g., tools for refurbishing grassplot and garden, or for small-size motor-cycle, motor cutter engines or analogous mechanism. The said manual control small tool has a piston engine, especially a two cycle engine, wherein the silencer connects with the air exhaust opening (1) of the burning compartment (2) of the piston engine (3), the silencer has at least one first chamber (4) and one second chamber (5) with at least one flow passage (6) set between the air exhaust opening (1) and the first chamber (4). The said silencer can overcome the shortcoming of the existing technology, and has one pressure connection on the condition of keeping higher dutyfactor of burning compartment, which can be indicated that the silencer can reduce or evade the mixture gas letting from the burning compartment. To provide the said silencer, the flow passage (6) is installed between the air exhaust opening (1) and the first chamber (4) in order to be convenient for the gas flowing, which is indicated that the exhaust effluent from the air exhaust opening (1) is mostly let into the first chamber (4)for the inertia, and reflux over again after being full of the first chamber (4), which can bring a back pressure in the burning compartment.

The invention relates to a base-catalyzed decomposition device and method for industrial waste containing a chlorinated organic compound. A reaction system of the device is communicated with chlorinated organic polluting waste via a reaction reagent mixing device, communicated with a nitrogen gas protection system, connected with a temperature control system, communicated with a residue processing device via a deposition and centrifugal separator, and communicated with a secondary activated carbon absorption tower via a condensing reflux device, tail gas from the secondary activated carbon absorption tower is released into the atmosphere, and the deposition and centrifugal separator is communicated with the pipeline of the reaction reagent mixing device; and the decomposition method comprises the following steps of: firstly, adding the chlorinated organic pollutant, the hydrogen donors from the reaction reagent mixing device and the like into the reaction system; secondly, starting the nitrogen gas protection system; and finally, heating and stirring to realize base-catalyzed dechlorination decomposition of the pollutant. The decomposition method has the advantages of high reaction rate, low reaction temperature, small temperature fluctuation of the reaction system, large actual reaction quantity of the pollutant and small risk of secondary pollution.

The invention discloses a method and device for activating lipid and blood glucose reduction through gastrocnemius passive movement. The device is provided with a bottom plate, a leg fixing frame is fixed to the rear end of the bottom plate, leg fixing bands and an ankle joint fixing band are arranged on the leg fixing frame, pedals are hinged to connecting positions of the bottom plate and legs, one or more pedals are arranged, and a driving device for driving the pedals to ascend or descend is arranged between each pedal and the bottom plate and comprises an air bag located between each pedal and the bottom plate, the upper and lower surfaces of the air bags are connected with the pedals and the bottom plate respectively, the air bags are connected with gas pipes, and the gas pipes are connected with a pressure-adjustment automatic charging and discharging gas pump. Compared with the prior art, the device is simple in structure and convenient to use, contracting and loosening of the gastrocnemius can be achieved, the effect of the gastrocnemius pump can be achieved, backflow of lower limb blood can be promoted, deep venous thrombosis can be effectively prevented, and circulation of lower limb blood can be improved.

The invention belongs to the technical field of refrigeration, and particularly relates to a refrigerant compressor oil circulation rate measuring and testing device based on intermiscibility. The device comprises an oil separation assembly which is provided with an oil outlet end and a refrigerant outlet end, the refrigerant outlet end is at least communicated with a compressor air suction port end at least through a condenser, a liquid storage device and an evaporator to form a refrigerant loop, the oil outlet end is communicated with a compressor air suction oil return port to form an oil circulation loop, and flow meters are arranged on the oil circulation loop and the refrigerant loop. The device further comprises a refrigeration assembly, and liquid supply temperature of the refrigeration assembly is lower than the highest two-phase separation temperature of a refrigerant and refrigerator oil. The device improves work efficiency of a whole oil circulation system, meanwhile, values measured by the flow meters on the loops are more accurate, and finally precision of oil circulation flow rate measurement data of a refrigerant compressor is guaranteed.

The invention provides an oxidation ditch membrane bioreactor, a wastewater treatment process and an application thereof. An oxidation ditch is arranged in the oxidation ditch membrane bioreactor; the oxidation ditch membrane bioreactor comprises an anoxic zone and an aerobic zone which are continuously arranged or an anaerobic zone, the anoxic zone and the aerobic zone which are continuously arranged; one or more membrane bio-reaction zones are arranged in the aerobic zone; a sewage inlet is arranged in the anoxic zone or the anaerobic zone; the membrane bioreactor is organically combined with the oxidation ditch; the advantages of S-MBR and R-MBR are fully utilized; sludge backflow is reduced or cancelled; the technical process and the power equipment are simplified; as S-MBR running, the oxidation ditch membrane bioreactor can realize in-situ online cleaning and soaking cleaning; as R-MBR running, the oxidation ditch membrane bioreactor can increase the land use rate and simplify operation and maintenance; an aerating system is optimized; the pulse aeration is combined for guaranteeing the valid oxygen demand in each zone, so that energy consumption waste is avoided. According to the invention, through the optimal combination of the reactor, the processing effect of nitrogen and phosphorus removal can be enhanced, the energy consumption can be saved and the land occupation can be saved.

The invention discloses a multi-hole fuel gas jet flow burner. The burner comprises a gas pipeline, a gas nozzle, an air pipeline and an air pipeline outlet, wherein the gas pipeline is a gas flow passageway, a hollow cavity between the air pipeline and the gas pipeline is an air flow passageway, a round of fire holes are evenly formed in the wall of the gas nozzle, an axial centre line of the gas nozzle serves as a circle center of an annular ring formed by the fire holes, and the following formulas: Dh / D b = 0.4-0.8, d / s =1.5-4, theta= 20 degrees-150 degrees are satisfied; the fire holes and intervals are arranged reasonably, and fully co-firing of gas and air can be achieved; multi-hole fuel gas jet flow is injected into incoming flow air in the direction of an included angle formed by an axis of the nozzle and the multi-hole fuel gas jet flow, expansion type flow is adopted to form a negative pressure in a rear side of the gas nozzle, backflow of high temperature smoke is achieved, and flame blowoff and flameout are avoided; air flow can increase negative pressure in the rear side of the gas nozzle, the backflow of the high temperature smoke is facilitated, and flame stabilization is further facilitated; fuel gas jet flow injects into shear layer outside a backflow area, and mixing of the air and flue is facilitated.

The invention relates to a method for treating early-stage landfill leachate. The method comprises the following steps: collecting early-stage landfill leachate through a regulating reservoir, transferring the leachate to a complete mixing anaerobic reactor through a pump for anaerobic reaction, subsequently transferring to an integrated denitrification reactor for denitrification reaction, subsequently transferring to an integrated iron-carbon Fenton reactor for Fenton reaction, subsequently transferring to a coagulating sedimentation device for coagulating sedimentation, subsequently transferring to an activated sludge reactor for activated sludge treatment, subsequently transferring to a filter tank for filtering, subsequently transferring to a disinfecting tank for disinfecting, and finally discharging the solution which meets the national discharge standards into municipal living sewage pipelines. The environment is effectively protected.

The invention provides a method for displaying a driver gathering point, a device, an electronic device, a storage medium and a method for displaying the driver gathering point. The method comprises the following steps of: collecting the geographical position of the driver gathering point from the driver's mobile device; converting the geographic position of the driver point located in the same preset conversion area into the geographic position of the center of the preset conversion area according to the preset conversion area; when the number of driver points within the preset first distancerange from the geographic position is greater than or equal to the first quantity threshold value, the driver points are taken as the driver gathering points for the geographic positions of each driver points after conversion; and clustering the driver aggregation points step by step according to the preset display areas to display the clustering points of the preset display areas at each level.The method and the device provided by the invention determine the gathering point of drivers according to the positioning of a mass of drivers, thereby saving the time of searching for the gathering point of drivers for the business personnel by narrowing the scope.

The invention relates to a treatment method of a high ammonia nitrogen landfill leachate. Particulates and suspended solids in the landfill leachate are intercepted through sand leach impurity removal treatment, the total hardness and alkalinity of the leachate are lowered through electrolysis scale removal treatment, the problem that scales are formed at the follow-up process section is solved, suspended solids and turbidity of the softening leachate are lowered through multi-medium filtering treatment, inorganic salinity and organic matter are separated through electrodialytic treatment, ammonia nitrogen is transferred to the concentrated water side to be recycled, low ammonia nitrogen water and degassing film drainage water produced through electrodialysis are subjected to film biochemical reaction treatment, and up-to-standard release film biological reaction treatment is ensured through the nanofiltration technology. The deamination pretreatment technology and the film depth treatment technology are combined, the combined technology treatment effect is good, operation is stable, the problem that biochemical treatment is hard due to the fact that the carbon nitrogen ratio of the high-concentration ammonia nitrogen leachate is imbalanced is solved, ammonia nitrogen is effectively recycled, high ammonia nitrogen can be recycled, and the investment and operation costs are low.

The invention relates to a liquid sample defoamer. The defoamer comprises a tank body, a sample inlet, a sample outlet and an air outlet, and is characterized in that: an air guiding tube is arranged in the tank body; the inside of the air guiding tube is communicated with the air outlet; the air guiding tube is communicated internally and externally on the upper part and the lower part of the air guiding tube; and a liquid sample passes through the sample inlet to enter the air guiding tube. The defoamer has the advantages of good defoaming effect, small volume, low cost, small dead volume and the like.

The invention relates to a device for simulating sludge plugging phenomenon of a tailing dam, and belongs to the technical field of mine geotechnical engineering. The device comprises a suspension solution preparation device, a water control device, a filtering device and a sludge plugging test device, wherein the water control device is arranged at the upper end of the suspension solution preparation device and communicates with the suspension solution preparation device through a pipeline; the filtering device is arranged at the upper end of the sludge plugging test device; one end of the filtering device communicates with the water control device, and the other end of the filtering device communicates with the sludge plugging device; the sludge plugging device communicates with the suspension solution preparation device through the pipeline. The device is applicable to the study on the sludge plugging phenomenon in a tailing dam body, and the causing conditions and the mechanism can be studied; the suspension particle diameter and concentration, the microporous medium particle size, the water environment, the infiltration head and other conditions are changed to research different sludge plugging conditions; a sludge plugging mode recognizing system can be built.

The invention relates to an electric fuel pump assembly of a one-piece automobile. The electric fuel pump assembly mainly solves the technical problems that the existing fuel pump assembly is of an open structure and is connected through a connection pipe and a wiring harness, easily resulting in unreliable connection, leakage, weak vibration resistance and the like. The electric fuel pump assembly of the one-piece automobile is characterized in that a sealed filter housing and an upper cover fixedly connected with the filter housing are arranged at an opening of the cleaner housing; the top end of the upper cover is fixedly connected with a flange; an oil delivery pipe connected with a spraying pipeline of the automobile is arranged at the top end face of the flange; the oil delivery pipe is communicated with a connection pipe inside the upper cover; the connection pipe is connected with a fuel pump outlet inside the filter housing; a voltage stabilizer is arranged inside the upper cover; an inlet of the voltage stabilizer is communicated with the connection pipe, and an outlet is arranged outside the upper cover and communicated with the external part. The electric fuel pump assembly of the one-piece automobile has the beneficial effects that the filter housing is sealed through the upper cover below the flange and the flange is fixedly connected with the filter housing, so the flange and the filter housing can form an integral structure.

The invention discloses a structural-filler-reinforced rural domestic and catering wastewater treatment plant and method. The wastewater treatment plant comprises an oil removal tank, an anaerobic tank, an anoxic tank, an aerobic tank, an aerobic reflux tank and a precipitation tank which are sequentially connected, wherein the oil removal tank is provided with a water inlet; a suspended oil absorption filler is arranged in the oil removal tank; a biological filler is respectively arranged in the anaerobic tank, anoxic tank and aerobic tank; a guide pipe is respectively arranged between the oil removal tank and anaerobic tank, and between the anoxic tank and aerobic tank; an aeration branch pipe in the aerobic reflux tank is provided with an aeration head; an ascending pipe is arranged above the aeration head; the side wall of the ascending pipe body is connected with the anoxic tank through a return pipe; and a gas stripping reflux mode is adopted to implement wastewater reflux. An integrated treatment technique is adopted in the entire allocation, has the advantages of simple construction and investment saving, has higher treatment capacity, can remove more than 75% of total nitrogen and more than 65% of total phosphorus and degrade more than 90% of COD (chemical oxygen demand), and is very suitable for distributed treatment of rural domestic wastewater.

The invention provides a reverse circulation drilling circulation channel switching short section, and belongs to the field of drilling tools and comprises an upper joint, a rubber plug and a reversing mandrel; the upper joint is provided with a first end and a second end which are oppositely arranged; the rubber plug is sleeved on the outer side of the upper joint, a discharge annular space is formed between the first end and the rubber plug, and an inflow annular space is formed between the second end and the rubber plug; a flow guide space communicating with a drilling fluid supply channelis arranged in the upper joint; the reversing mandrel is arranged in the flow guide space, and the flow guide space is separated into an inflow channel between the reversing mandrel and the inner wallof the flow guide space and an outflow channel inside the reversing mandrel; and the inflow channel, the inflow annular space, the outflow channel and the discharge annular space are communicated insequence. The reverse circulation drilling of an open hole section can be realized, ground equipment does not need to be changed and adjusted, the conventional drilling construction process is not influenced, the open hole section at the bottom of a well is free of rock debris, the drilling friction resistance is reduced, the speed is increased, the cost is reduced, and the drilling safety is guaranteed.

The invention relates to a method and a device for salt separation and crystallization of high-salinity wastewater in the coal chemical industry. The device comprises a first MVR (mechanical vapor recompression) forced evaporation unit, a cyclone separation filtering unit, a nanofiltration membrane group unit and a second MVR forced evaporation unit. The first MVR forced evaporation unit is used for evaporation of the high-salinity wastewater in the coal chemical industry to obtain sodium sulfate crystalline salt and first crystallization mother liquor; the cyclone separation filtering unit is used for removing tiny solid crystalline salt particles from the first crystallization mother liquor; the nanofiltration membrane group unit is used for removing divalent sulfate ions from the first crystallization mother liquor; the second MVR forced evaporation unit is used for evaporation and concentration of sodium chloride containing waste water to obtain sodium chloride crystalline salt and second crystallization mother liquor; the second MVR forced evaporation unit sends the second crystallization mother liquor into the nanofiltration membrane group unit to realize cyclic separation. The method and the device for salt separation and crystallization of the high-salinity wastewater in the coal chemical industry have advantages that low energy consumption, low cost and freeness of secondary pollution in treatment of the high-salinity wastewater are realized, resource recycling is realized as well, purity in salt separation and crystallization is greatly improved, and zero emission of wastewater is guaranteed.