16 results about "Backflow" patented technology

An exemplary device and method for microfluidic transport is disclosed as providing inter alia a passive check valve (100), a fluid inlet channel (210), a fluid outlet channel (220) and a pumping cavity (240). The fluid inlet channel (210) is generally configured to flow a fluid through the check valve (100). The check valve (100) generally provides substantially passive means for preventing or otherwise decreasing the incidence of purged outlet fluid re-entering either the pumping cavity (240) or the fluid inlet channel (210). Accordingly, the reduction of backflow generally tends to enhance overall pumping performance and efficiency. Disclosed features and specifications may be variously controlled, adapted or otherwise optionally modified to improve micropump operation in any microfluidic application. Exemplary embodiments of the present invention representatively provide for substantially self-priming micropumps that may be readily integrated with, for example, existing portable ceramic technologies for the improvement of device package form factors, weights and other manufacturing and/or device performance metrics.

The invention relates to a counter-flow flame combustion chamber which has a monocyclic cavity structure. The counter-flow flame combustion chamber is designed by adopting a concept of staged combustion, and combustion gas is supplied from a pre-combustion stage and a main combustion stage, wherein the pre-combustion stage adopts a diffusion combustion structural mode with stable whirlblast, and the main combustion stage adopts a combustion structural mode of combining premixing and pre-evaporation with counter-flow flame. The counter-flow flame combustion chamber mainly comprises a shunt diffuser, an external combustion chamber case shell, an internal combustion chamber case shell, a fuel nozzle, a head pre-combustion stage, a flame tube external wall main combustion stage, a flame tube internal wall main combustion stage, a flame tube external wall and a flame tube internal wall, wherein the head pre-combustion stage utilizes stable flame in a low-speed backflow area, which is generated by whirlblast air entering the combustion chamber from a pre-combustion stage whirlblast assembly; the main combustion stage comprises the flame tube internal wall main combustion stage and the flame tube external wall main combustion stage, and uniform oil-gas mixture jetted from the main combustion stage counters in a flame tube to form a counter jet flow which forms counter-flow flame under the ignition of pre-combustion flame. The invention has simple structure, and can effectively reduce disposal of pollutants besides ensuring the normal work condition of an aeroengine.

A system of enhancing air quality for buildings is proposed. The system includes a multi level building having a hoistway vertically extending through at least two levels of the building, for receiving a car vertically moving therein.. The system further includes at least an air circulating device placed on a top level of the building for pumping fresh air into the hoistway, a plurality of current directing devices installed between different levels of the building for directing air in the hoistway flowing from an upper level of the building to a lower level of the building, and a waste discharge device in communication with an available exhaust outlet in a basement for discharging exhaust out of the hoistway. Accordingly, the air flowing in the hoistway is maintained in a single direction. With the system of enhancing air quality for buildings, dirty air discharged below the car is maintained to flow downwardly to prevent backflow of the dirty air, so as to achieve better air quality in the elevator.

The present flow rate safety valve comprises a valve body, a valve seat, a valve core and a spring. The valve core is an open cylinder. A sealing washer is set up on the front end of the valve core. Part of the rim of the sealing washer contacts the inner wall of the valve body, forming a seal and guiding the valve core in the axial direction of the valve body. A projecting sealing part is arranged on the valve seat, and the inner wall at the rear end of the valve core is a conical surface which extends from the rear end face to the middle part of the valve core and forms a guide for the conical sealing part. Inside an outflow pipe of the valve body, a backflow preventer is arranged in order to prevent the medium backflow.

The invention discloses an oil scraper ring, which comprises a circular body. An oil storage groove is formed in the upper end part of the body. The inner wall of the body is a scraping wall. The outer wall of the body is a retaining wall which is higher than the scraping wall. According to the scheme, the retaining wall is higher than the scraping wall, and when the oil scraper ring rotates along with a piston or a piston rod, lubricating oil in the oil storage groove can be prevented from being splashed from the oil storage groove under centrifugal force generated by rotation; and in addition, the bottom surface of the oil storage groove is an inclined surface, and the bottom surface close to the retaining wall is lower than the bottom surface close to the scraping wall, so that the center of gravity of the lubricating oil in the oil storage groove is close to the retaining wall, and the oil scraper ring difficultly rotates or rotates at low speed to favorably prevent the lubricating oil from being splashed from the oil storage groove. According to the scheme, scraped lubricating oil cannot flow out of the oil storage groove, so that the backflow of the lubricating oil is effectively prevented, and an oil leakage phenomenon is avoided to reduce the oil content of air in a piston type air compressor and ensure the purity of the air in the piston type air compressor.

The invention discloses a flavored needle mushroom cleaning device. The flavored needle mushroom cleaning device comprises a rack, a conveying belt, a first motor, a supporting rack, a water delivering tube, a sprayer, a connecting plate, a secondary cleaning device and a backflow device, wherein the rear end of a control box is fixed on the bottom of the rear side of the right end of the rack through screws; a power wire is inserted in the middle of the right side of the control box; after needle mushrooms enter a cleaning pond and cleaning medicines cooperate with reused water, the needle mushrooms are cleaned secondarily, and thus are fully cleaned, and the quality of the cleaned needle mushrooms is high; and sewage after primary cleaning drops into a liquid collecting box via through holes in a conveying belt and then is collected, power is provided through a water pump, the water is pumped back into the cleaning pond from a backflow tube for secondary utilization, during backflow,the water is filtered by a filter, a first filter element and a second filter element cooperate to adsorb and filter impurities and microorganisms in the sewage, the sewage is clean, therefore, waterresources are saved, and the environmental protection property is improved.

The invention relates to the technical field of automatic machinery, in particular to a waterfall type cap sorter. The waterfall type cap sorter comprises a housing assembly, a bottle cap conveying assembly, a driving assembly, a pneumatic conveying assembly and a backflow assembly, wherein the bottle cap conveying assembly is arranged on the inner side of the housing assembly, the driving assembly is in driving connection with the bottle cap conveying assembly, the backflow assembly is arranged on one side of the top of the housing assembly, bottle caps are arranged at the lower portion of the housing assembly, the driving assembly drives the bottle cap conveying assembly to convey the bottle caps to the top of the bottle cap conveying assembly, the bottle caps are blown to the backflow assembly by starting the conveying assembly, the bottle cap conveying assembly can make openings of the bottle caps to always face the outer side in the conveying process. The waterfall type cap sorterhas the advantages that the bottle cap conveying assembly makes the bottle caps with the openings outward to be left in the conveying process, the bottom caps with the openings inward are removed, itis achieved that the bottle caps are consistent in opening direction, and the bottle cap sorting effect is improved; in the bottle cap conveying process, the bottle caps are not in contact with a groove wall, and the problem is solved that a conventional turntable type cap sorter causes stains due to multiple times of back-and-forth friction.

The invention relates to the field of production and manufacture of charging plugs, in particular to an automatic circulation device and method for a charging connector shell clamping jig. The automatic circulation device for the charging connector shell clamping jig comprises a shell clamping jig material passing assembly, a shell clamping jig driving assembly, a shell clamping jig backflow assembly, a shell clamping jig conveying assembly and a shell clamping jig pushing-in assembly, wherein a plurality of stations are arranged on the shell clamping jig material passing assembly, and a lowershell clamping feeding station, a base body jig feeding station, an upper shell clamping feeding station, a pressing station, a detection station, a bending station, a welding station and a discharging station are sequentially arranged on the shell clamping material passing assembly along the feeding direction; the shell clamping jig driving assembly is positioned on the side of the shell clamping jig material passing assembly, and is used for driving and positioning a jig in the shell clamping jig material passing assembly. A high-rigidity guide rail moving mode is adopted for the circulation device for the shell clamping jig, the problem that the rigidity of a belt and the chain transmission is poor is solved through a large rigidity guide moving mode by the shell clamping jig circulation device, the components are orderly connected, and the efficient circulation of the jig is facilitated.

The invention discloses a double-large-end drain trap, which comprises a pollution discharge pipe connector, a water storage height card, a ground buried pipe connector and a water storage depth card, wherein the inner circle calibers of the pollution discharge connector and the ground buried pipe connector are respectively greater than 110mm, so that the connector directions of the pollution discharge pipe connector and the ground buried pipe connector are respectively vertical to the ground, and the problems of negative pressure resistance incapability and easy occurrence of air backflow and connector leakage since the water storage depth of a sanitary appliance does not reach the standard are better solved.

The invention discloses a braided cotton roll for the dental operation. The braided cotton roll comprises a cotton roll body, a braided wire, a protruding body, a column body and an upper cover. The braided wire is wound on the surface of the cotton roll body. The protruding body is formed by extruding the braided wire. The upper cover is arranged on one side of the cotton roll body. The column body is arranged in the middle of the upper cover. According to the braided cotton roll, the upper cover is arranged on the side face of the cotton roll body, and the column body is arranged in the middle of the upper cover. In this way, people can use a clamp to clamp the cotton roll body to disinfect and stop the bleeding of the interior of an oral cavity, while the clamp does not touch the innersurface of the oral cavity. The secondary infection is avoided. A sponge layer and a hollow layer are arranged on the inner layer of the cotton roll, and round holes are formed in the surface of the hollow layer. As a result, the backflow caused by the excessive blood in the hemostatic effect of the cotton roll body can be avoided. The secondary pollution in the oral cavity is avoided. The braidedcotton roll is good in hemostatic effect, simple in structure and suitable for popularization and use.

The invention provides integrated backflow-free A2O equipment based on a fluidized bed. The equipment comprises an anaerobic zone, an anoxic zone, aerobic zones and a sedimentation tank, and is characterized in that the anaerobic zone, the anoxic zone and the sedimentation tank are sequentially arranged and communicated through an overflow port, the aerobic zones are arranged on the two sides of the anoxic zone and communicated with the anoxic zone and the sedimentation tank, the anoxic zone and the aerobic zones are separated through flow guide plates, the flow guide plate is provided with at least two circulation ports from top to bottom, an aeration disc is arranged at the bottom of the aerobic zone, stirring devices are arranged in the anaerobic zone and the anoxic zone, the bottom of the sedimentation tank is provided with a sludge reflux inlet and a sludge discharge port, the sludge reflux inlet is communicated with the anaerobic zone, and the top end of the side wall of one side, far away from the anoxic zone, of the sedimentation tank is provided with a water outlet. According to the invention, efficient and low-energy-consumption wastewater treatment is realized.

The invention relates to a novel pen type indwelling needle. An elastic shaft is arranged in a thimble seat so that the thimble seat can be sealed automatically when the indwelling needle is pulled out and highly difficult operation that the head end of a thimble of a traditional pen type indwelling needle must be pressed manually before needle pulling to avoid backflow of blood is avoided; due to the extensibility of the elastic shaft, the thimble seat can be directly matched with an infusion conical head, arrangement of an additional infusion pipe like a y-type indwelling needle is needless, and blood return, caused by extrusion of the additionally arranged infusion pipe, of y-type indwelling needle is avoided. In a word, the novel pen type indwelling needle is simple in structure and convenient to produce, has the advantages of the pen type indwelling needle and the y-type indwelling needle, can avoid the disadvantages of the pen type indwelling needle and the y-type indwelling needle, and additionally has the performance of positive-pressure pipe sealing.