56results about How to "Good anti-reflux effect" patented technology

The invention discloses a back-flow preventer valve in a pipeline. The back-flow preventer valve in the pipeline comprises a pipe body and valves, wherein the valves are arranged in a pipe cavity. Two valves are designed in the pipe cavity, the width of the middle parts of the valves is greater than the radius of the pipe cavity, and is 1.5-2.5 times the radius of the pipe cavity; the root parts of the valves are thicker than other parts, are arc-shaped and connected with the inner wall of the pipe cavity; free edges of the upper valve and the lower valve face towards the flow direction of the fluid; the valves are light films with elasticity and toughness; and the pipe body is transparent, and the two valves are provided with different colors. The back-flow preventer valve in the pipeline has the advantages that: 1, the two valves are simple and practical, satisfy biomechanics, and can be arranged at a plurality of positions in the same pipe body; 2, down-flow is not affected when the back-flow is prevented; 3, convection of liquid and gas in a drainage pipeline is prevented; and 4, the structure of the pipeline is not affected when the back-flow preventer valve is widely applied to any part of various pipe cavities and pipelines in medical science or non-medical life.

The invention relates to a device used for grouting reinforcement from the interior of a shield tunneling machine to a peripheral stratum. A steel casing pipe is stricken into the stratum in front of a reserved hole through the reserved hole in a shield body of the shield tunneling machine, and a perforated steel grouting pipe connected in the steel casing pipe is used for carrying out grouting reinforcement on the peripheral rock stratum of the shield body. Meanwhile, the peripheral stratum within different ranges can be reinforced through perforated steel grouting pipes with different lengths, and thus the purposes of carrying out grouting reinforcement from the interior of the shield tunneling machine to the peripheral stratum, controlling the settlement deformation of the stratum, performing supporting, and reducing shield trapping and construction safety risks are achieved. While the stratum is reinforced through grouting, a water closing ring and a backflow-prevention rubber pad are adopted, it can be effectively prevented that grout flows back into the shield tunneling machine body in the grouting process, and it is ensured that construction is safe and environmentally friendly.

The invention relates to a backpressure-adjusting pilot operated safety valve. The backpressure-adjusting pilot operated safety valve comprises a main valve and a pilot valve; the main valve comprises a main valve body, a main valve seat, a main valve flap and a main valve bonnet; the pilot valve comprises a pilot valve body, a pilot valve seat, a pilot valve flap, a pilot valve bonnet and a pressure adjusting device, wherein a pilot valve body inlet channel is communicated with a main valve body inlet cavity through a pipe fitting. The backpressure-regulating pilot operated safety valve is mainly characterized in that a flow limit hole communicating a main valve backpressure cavity with the pilot valve body inlet channel is formed in the side wall of the pilot valve seat, a pilot valve outlet cavity is communicated with a discharge cavity of the main valve body through a discharge channel, the discharge channel, the pilot valve body inlet channel and a pipe fitting outlet channel form a three-way channel, a three-way valve is arranged in the three-way channel, one end of a three-way valve flap is provided with a seal surface mutually matched with the end opening of the pipe fitting outlet channel, the other end of the three-way valve flap is provided with a seal surface mutually matched with the end opening of the discharge channel, and the outer circumferential surface of the three-way valve flap is in clearance fit with the inner cavity wall of the pilot valve body. The backpressure-adjusting pilot operated safety valve can prevent a medium contained in the discharge cavity from flowing backwards and has the advantages of being good in backflow preventing property, reliable in reverse sealing property and the like.

The invention discloses an anti-reflux support tube of a ureter. The anti-reflux support tube of the ureter comprises a tube body, wherein an elastic valve is arranged in the tube body to form a one-way flow valve structure; through the arrangement of the elastic valve in the tube body, when urine flows downstream, the elastic valve is opened; and when urine flows back, the elastic valve is closed so as to form the one-way flow valve structure. The anti-reflux support tube of the ureter has the advantages of no influence on drainage, good anti-reflux effect, simple structure and easy use.

The invention discloses an automatic closing device and a reaction device. The closing device includes an air intake system. The air intake system includes an air intake pipe, an anti-backflow sealing ring and an anti-backflow limiting member. The anti-backflow sealing ring is installed in the lumen of the air intake pipe. , the anti-backflow sealing ring has an air inlet, the two ends of the inlet pipe are connected through the air inlet, the anti-backflow limiter is located in the inlet pipe, and the anti-backflow limiter has a working position and a non-working position, wherein the working position is The anti-backflow limiter closes the air inlet, and the non-working position refers to the space between the anti-backflow limiter and the anti-backflow sealing ring. The reaction device includes the automatic closing device. The structure of the automatic sealing device is simple and reasonable, convenient for manufacturing and processing, and the processing cost is low. At the same time, the anti-backflow effect of exhaust gas is good, the exhaust gas is not easy to leak, the entire automatic sealing device is not easy to be damaged, and has a long service life.

The invention relates to the field of blood taking equipment for medical inspection processes, in particular to a blood taking tool anti-counter-flow structure and a blood taking needle with the same. The blood taking tool anti-counter-flow structure comprises a barrel-shaped body with a top and an internal flow path and a straight-barrel-shaped anti-counter-flow rubber sleeve which is provided with a top and arranged on the internal flow path of the barrel-shaped body, a through hole is formed in the top wall of the barrel-shaped body, and the peripheral edge of the outer wall of the top of the anti-counter-flow rubber sleeve is in sealing contact with the peripheral edge of the inner wall of the through hole. The anti-counter-flow structure of the sampling taking needle is arranged between a vein puncture needle and a rubber plug puncture needle. According to the blood taking tool anti-counter-flow structure and the blood taking needle with the same, the blood taking needle has the better anti-counter-flow effect, and is convenient to use, safe and sanitary. The anti-counter-flow rubber sleeve is simple in structure, is overall of a complete straight-barrel-shaped structure, and is good in stability in the use process.

The invention relates to the field of medical instruments, in particular to an anastomosis device which comprises a first support and a second support; the first support is provided with a first channel; the second support is provided with a second channel and connected with the first support; the second support is located outside the first channel, and the first channel is communicated with the second channel; or at least part of the second support is contained in the first channel. The anastomosis device is small in structural size and can be conveniently arranged in an imbedding device, so that the use difficulty can be reduced.

The invention discloses a needleless medicine adding device which comprises an infusion tube. A backflow preventive valve and a medicine liquid filter are mounted at two ends of the infusion tube, anda needleless connecting piece is arranged on the infusion tube and is positioned between the backflow preventive valve and the medicine liquid filter; the needleless connecting piece comprises a medicine adding tube, the medicine adding tube is connected with the infusion tube, a threaded connector is arranged at an end of the medicine adding tube, and a threaded cap is arranged on the threaded connector in a connected manner. The needleless medicine adding device has the advantages that good filter effects can be realized by the needleless medicine adding device, and medicines can be safelyadded by the needleless medicine adding device.

The invention provides a backflow-preventing hemostatic propeller. The backflow-preventing hemostatic propeller comprises a barrel (1), a propelling pipe (2), a piston (3), a pipe barrel connector (4), an expanding part (5) and a piston rod (6), wherein a threaded groove (7) with a continuous spiral track is formed in the circumference of the piston (3); a backflow-preventing limiting concave part(8) is formed in the front end of the threaded groove (7) along the circumference of the piston (3); a threaded protrusion (9) with a continuous spiral track is arranged on the circumference of the inner wall of the barrel (1); a backflow-preventing limiting clamping block (10) is arranged at the front end of the threaded protrusion (9) along the circumference of the inner wall of the barrel (1);a backflow-preventing one-way blocking structure is arranged at the end, connected with a liquid outlet of the barrel (1), of the pipe barrel connector (4) and comprises a supporting blocking frame (12) and a backflow-preventing one-way blocking piece (13); and the backflow-preventing one-way blocking piece (13) is of an inner-outer-layer structure. The backflow-preventing hemostatic propeller issimple in structure, convenient to operate and easy to propel, and the backflow-preventing effect of the hemostatic propeller is improved.