4results about How to "Reduce fluid velocity" patented technology

The invention provides a plant protection spray head and a plant protection spraying device. The plant protection spray head comprises a shell, an isolation cylinder is coaxially sleeved with the shell, and an inner cavity with the left end open and the right end closed is formed between the shell and the isolation cylinder; a jet flow cavity with the right end open and the left end closed is formed in the isolation cylinder. A plurality of jet flow holes used for communicating the inner cavity with the jet flow cavity are formed in the barrel wall of the isolation barrel, and a set angle is formed between the jet flow holes and the axis of the inner cavity. By changing the internal structure of the plant protection sprayer, the liquid medicine flowing condition is improved, energy loss is reduced, and the liquid medicine utilization rate is increased. The plant protection spraying device can flexibly adjust the angle and direction of the spraying head according to the forms and growth stages of different crops, the utilization rate of pesticide is increased, and environmental pollution is reduced.

The utility model discloses a mechanical anti-erosion PDC (Polycrystalline Diamond Compact) drill bit, which relates to the technical field of drilling, and comprises a drill bit part, a handle part and an anti-erosion component, the handle part is connected to the lower end of the drill bit part, and a central flow channel communicated with the drill bit part and a branch flow channel for communicating the central flow channel with the outside are arranged along the axial direction of the handle part; the anti-erosion assembly is arranged in the branch flow channel, when the fluid pressure of the center flow channel is larger than the set pressure, the anti-erosion assembly enables the center flow channel to be communicated with the branch flow channel, and when the fluid pressure of the center flow channel is smaller than the set pressure, the anti-erosion assembly enables the branch flow channel to be closed. The anti-erosion assembly is arranged in the branch flow channel communicated with the center flow channel, so that when the fluid pressure drop of the drill bit exceeds a set pressure value, part of fluid in the center flow channel can enter the branch flow channel through the anti-erosion assembly, the impact force of the fluid acting on the drill bit part is reduced, and the risk of excessive erosion to the drill bit is reduced.

The application provides a separator and a cleaning device, which comprises a water cup, an inlet water cavity is arranged in the water cup, the inlet water cavity is communicated with the outside of the separator, a first filter assembly is connected to the water cup, the first filter assembly is provided with a first water outlet, a cyclone channel and a first filter screen are arranged in the first filter assembly, the first water outlet is communicated with the inside of the first filter screen, a second filter assembly is arranged outside the water cup, the second filter assembly is communicated with the first filter assembly, the second filter assembly is provided with a second filter screen, the second filter screen is provided with a second water outlet, a water outlet element is internally provided with a water outlet channel, the water outlet channel is communicated with the first water outlet and the second water outlet, and the water outlet element is further provided with a third water outlet communicated with the water outlet channel.

This invention relates to the field of point-of-care testing devices, and more particularly to a microfluidic immunochromatographic reagent kit. It includes a chip shell and an external diluent addition component. The chip shell has a blood collection head at its front end, and a chromatography chamber for placing test strips inside the chip shell. The blood collection head communicates with the chromatography chamber through a microfluidic channel within the chip shell. The external diluent addition component is detachably connected to the front end of the chip shell and is used to add diluent to the chromatography chamber through the blood collection head and the microfluidic channel. The blood collection head collects blood samples. The microfluidic channel has a capillary structure to ensure that the blood sample is premixed with the diluent as it passes through the microfluidic channel, and to slow down the flow rate of the mixture into the chromatography chamber. With this invention, medical personnel only need three steps—"puncture-merge-observation"—to complete the operation and testing, requiring no professional training.