4results about How to "Constant flow" patented technology

This utility model discloses a silicate ion measurement injection pressure stabilization device, comprising: an injection pipe, a pressure stabilization component, and a filter component; the pressure stabilization component includes a self-regulating pressure regulating valve and a flow controller fixedly connected to both sides of the injection pipe, a buffer tank fixedly installed on the upper part of the injection pipe, and an upper buffer cover and a lower buffer cover installed on the upper and lower sides of the buffer tank, respectively. According to this utility model, the water sample being transported in the injection pipe can have its pressure stabilized by the self-regulating pressure regulating valve, flow controller, and buffer tank installed on the injection pipe, ensuring a constant flow rate, thereby improving subsequent measurement accuracy, equipment stability, and data reliability. Simultaneously, the upper and lower buffer covers installed on the upper and lower sides of the buffer tank provide double-layer buffering for the water sample being transported from the injection pipe to the buffer tank during its descent, thus ensuring a stable flow rate of the water sample output through the output pipe.

The utility model belongs to the field of cigarette test board appliances, and particularly relates to a monitoring comparison rod for a cigarette / filter rod test board. The comparison rod comprises an outer pipe, a central pipe, a paper ventilation rate calibration assembly and a mouth ventilation rate calibration assembly, wherein a first through hole and a second through hole are respectively formed in the outer pipe along the axial direction; the central pipe is arranged in the lower part of the outer pipe; the paper ventilation rate calibration assembly is arranged in the middle of the outer pipe and corresponds to the first through hole in position. The paper ventilation rate calibration assembly is connected to the top of the center pipe in a sealed mode. The nozzle ventilation rate calibration assembly is arranged in the upper portion of the outer pipe and corresponds to the position of the second through hole. The nozzle ventilation rate calibration assembly is connected to the top of the paper ventilation rate calibration assembly in a sealed mode. The device can be used for calibrating the paper ventilation rate and the mouth ventilation rate measured by the cigarette test board, so that the accuracy of data measured by the cigarette test board is ensured.

The application discloses a fresh water circulating aquaculture whole-process water treatment system and method, and belongs to the technical field of circulating aquaculture water treatment. The system comprises a water inlet treatment subsystem, an aquaculture pond subsystem and a tail water treatment subsystem which are sequentially and circularly connected. The water inlet treatment subsystem comprises a water storage tank, a sand filter tank and a filtered water tank which are sequentially connected. The aquaculture pond subsystem comprises a plurality of aquaculture pond circulation combinations, and each aquaculture pond circulation combination comprises an aquaculture pond cluster, a first microfilter, a circulating pump pond, a biological aerated filter, a disinfection pond, a decarbonization device and an oxygenation and temperature adjustment pond which are sequentially and circularly connected. The tail water treatment subsystem comprises a second microfilter, a sulfur autotrophic denitrification pond and an SBR reaction pond cluster which are sequentially connected. The system integrates fresh water circulating water treatment, tail water treatment and source water treatment, can meet the requirements of medium and large fresh water circulating aquaculture plants on aquaculture water quality, can save land occupation and investment, and meets the requirements of green and sustainable development.

The utility model discloses a screw assembly and a double-screw extruder for a reactive melt-blowing process, the screw assembly comprises two screws which have the same structure, rotate in the same direction and are meshed with each other, and each screw consists of a mandrel and a thread element; one end of the core shaft is a feeding end, the other end of the core shaft is a discharging end, and the core shaft can rotate under the action of external force; the threaded element is arranged on the mandrel in a sleeving mode and can rotate along with the mandrel. The screw assembly comprises a feeding section, a reaction section and an extrusion section which are connected in sequence, and the types, the leads and the lengths of internal thread elements in all the sections are reasonably arranged; therefore, conveying of low-viscosity raw materials, initiation of polymerization reaction, macromolecule growth and mixing, conveying and extrusion of high-viscosity polymerization products can be rapidly achieved in a continuous process, and a continuous polymer melt which is stable in pressure, constant in flow and easy to draw and thin is provided for a subsequent spinning assembly.