81 results about "Spiral joint" patented technology

The present invention relates to spiral type corrugated plastic pipe material and its preparation method. The perparation method includes following steps: using a first extrusion mechanism to extrudethe fused bar shaped plastic sheet material used as pipe wall material which is wound around the pipe axis in the form of spiral-joint pipe with adjucent edges mutually lap-fused jointed successively, then using a press roller mechanism tightly press the spirally lap-fused joint to form the spiral-joint plastic pipe; similarly, using another extrusion mechanism extrudes corresponding rib type strengthening trapesoidal plastic tube and using the same spiral winding mode to press the said plastic tube on the spiral-joint of the above-mentioned plastic pipe to obtain the said corrugated plastic pipe.

The invention relates to the technical field of wires and cables and in particular relates to a deep-sea cable radial and longitudinal water-blocking pressure test device. The deep-sea cable radial and longitudinal water-blocking pressure test device comprises a steel tube, wherein spiral joints are respectively arranged at the two ends of the steel tube; the spiral joints are matched with sealing covers or blind-end sealing covers; a gasket and an U-shaped rubber pad are arranged between the spiral joints and the sealing covers; a pressure meter and a pressure release opening are formed in the upper part of the steel tube; a water inlet is formed in the lower part of the steel tube; the water inlet is connected with a pressure pump through the water inlet tube. The deep-sea cable radial and longitudinal water-blocking pressure test device has the advantages that: firstly, the spiral joints, the U-shaped sealing ring, the gasket and the sealing covers are combined, so that the greater the water pressure, the tighter the sealing, and thus, a sealing problem between the cables and the equipment is solved; secondly, the structure is simple, the manufacturing is easy, the experimental operation is convenient, the cost is relatively low, and the popularization is convenient; and thirdly, by virtue of simple transformation, the radial and longitudinal water tightness performance test under the cable water pressure is adapted.

The present invention relates to a method of forming a preform from a material having a first edge and a second edge utilizing a mandrel. The method comprises the step of extruding the material through an extruder to form an extrudate. The first edge of the extrudate has a configuration complementary to a configuration of the second edge of the extrudate. The method also includes wrapping the material around the mandrel by abutting the first edge and the second edge to form a spiral joint.The invention uses a manufacturing apparatus comprising a multi-screw extruder having at least three intermeshing screws for forming the extrudate. The mandrel receives the extrudate and a pressure-applying device adjacent to the mandrel engages the extrudate and applies pressure to the spiral joint to create a smooth exterior surface of the extrudate and to define the preform.

The invention relates to an astral-spiral joint coal feeding device which consists of an astral feeding device and a spiral feeding device connected in series; the lower part of a feed hopper (1) is connected with a double-lock hopper device (2); the lower part of the double-lock hopper device (2) is connected with the astral feeding device (3); the outlet of the astral feeding device (3) is connected with the inlet of the spiral feeding device (4); the outlet of the spiral feeding device (4) is connected with a hearth (6); a water-cooled jacket (5) is arranged on a metal tube shell of the outlet of the spiral feeding device (4); and a pressure balancing pipe (7) is arranged between the hearth (6) and the double-lock hopper device (2), the astral feeding device (3) and the spiral feeding device (4). The astral-spiral joint coal feeding device mainly solves the problems of the sealing of a rotating shaft and the stable feeding under the pressure condition, has the characteristics of convenient, safe, continuous and stable operation and the like, and can be used as a feeding system of a pressure boiler (such as a pressurization fluidized bed combustion furnace and a pressurization fluidized bed gasification furnace).

The invention discloses a spiral steel pipe with reinforcing rings and a manufacturing method of the spiral steel pipe. The steel pipe comprises a spiral pipe body formed by spirally winding main steel strips; spiral joints are formed between the adjacent main steel strips of the spiral pipe body; the reinforcing rings are spirally wound on and locked to the outer wall or the inner wall of the spiral pipe body; at the spiral joints, the reinforcing rings are formed by bending narrow steel strips and the sections of the reinforcing rings are circular-arc-shaped, square or trapezoidal. The reinforcing rings are capable of enhancing the overall annular strength of the pipe, the thickness of the pipe can be reduced by more than a half, and the cost can be greatly reduced; meanwhile, the inertia moment of the circumferential section of the pipe is increased exponentially; as a result, the effect of the reinforcing rings is much better than that of a common reinforcement way, and consequently, the deformation problem of a large-diameter steel pipe, in particular a steel pipe of which the diameter is greater than 4m, during production is solved, and a steel pipe with an ultra-large diameter (10m or above) can be produced. Besides, the spiral joints formed between the adjacent sections of the spiral steel pipe are capable of surrounding the reinforcing rings so that the leakage protection at the joints can be strengthened.

The invention relates to an elliptical motion machine (Elliptical) which can adjust the pedal track pitch. The elliptical motion machine comprises a frame which can be stably arranged on the ground, a guideway seat which is provided with the front end and the rear end which can deflect relatively to the frame, a pitch controller device arranged between the frame and the guideway seat to control the angle of the guideway seat, a spiral mechanism arranged on the frame being provided with two relative spiral joints which motion on the enclosed track, a left supporting rod and a right supporting rod which are respectively provided with the front end which are riveted with the two spiral joints and the rear end which motions between the front end and the rear end of the guideway seat and a supporting part arranged between the front end and the rear end, a left connecting rod and a right connecting rod respectively being provided with the front end which can forwards and backwards motion relatively to the frame and the rear end, and a left pedal and a right pedal respectively connected with the rear end of the two connecting rods and forming the relative hinge relationship with the supporting part of the corresponding supporting rod.

The invention relates to a medical connecting device which consists of an upper shell, a lower shell and an elastic valve core. The upper shell is equipped with an upstream end and a downstream end which have openings; a cavity is positioned between the upstream end and the downstream end. One end of the lower shell is hermetically connected and fixed with the downstream end of the upper shell, and the other end is a spiral joint. The elastic valve core is arranged in the cavity of the upper shell and the opening of the upstream end, one end of the elastic valve core is fixedly connected with the lower shell, and the other end is controllably sealed with the opening of the upstream end of the upper shell. The elastic valve core controls flow of liquid in the cavity by changing self-volume. The connecting device has the advantages of reasonable structure, delicate design and convenient use, and that the device can be connected with a plurality of infusion apparatuses such as an injector, an infusion set, an indwelling needle and an in vivo duct, etc., to treat patients. No needle is required by the connecting device, thus injuries and accidental infection of medical staff can be avoided in the course of transfusion operation and that liquid flows to the downstream medical apparatus in the normal direction by the connecting device is ensured.

The invention discloses an indwelling needle controlled-release positive pressure device which comprises a protecting cap, a spiral joint, a front guide pipe, a front tee joint, a controlled-release guide tube, a middle guide tube, a clamp, a rear tee joint, a rear guide tube, a tee joint seat, a positive pressure joint and a liquid storage device. The clamp sleeves the middle guide tube, two ends of the controlled-release guide tube and the middle guide tube are connected with two-hole ends of the front tee joint and the rear tee joint respectively, and other accessories are connected with one another. The indwelling needle controlled-release positive pressure device is characterized by being provided with the two guide tubes, and one is the controlled-release guide tube with a micro hole in the middle while another one is the middle guide tube universal in hole diameter. When the middle guide tube is clamped by the clamp, hydraulic pressure released by the positive pressure joint and the liquid storage device forms pressure, medicine liquid slowly flows out from the micro hole of the controlled-release guide tube to an indwelling needle guide tube component to seep into a blood vessel, and forming of thrombus can be effectively prevented. In addition, when infusion is needed again in the second day, normal infusion can be performed by sterilizing a connecting position, connecting and opening the clamp on the middle guide tube.

The invention relates to the field of pipeline anti-corrosion, in particular to a pipeline internal anti-corrosion device which includes a carrying trolley for moving in the axial direction of a pipeline, a feeding mechanism arranged on the carrying trolley, a paint transfer mechanism, an automatic spraying mechanism, a rotating driving mechanism and an automatic screeding mechanism. Anti-corrosion paint is put in the feeding mechanism, the feeding mechanism is used for supplying the anti-corrosion paint and stirring the anti-corrosion paint evenly. The output end of the feeding mechanism is connected with the input end of the paint transfer mechanism, the output end of the paint transfer mechanism is connected with the input end of the automatic spraying mechanism which is used to executethe pipeline inner wall spraying work, the output end of the rotating driving mechanism is connected with the automatic spraying mechanism in a transmission mode, the rotating driving mechanism is used to drive the automatic spraying mechanism to rotate, and the automatic screeding mechanism rotates synchronously with the automatic spraying mechanism for screeding the paint sprayed on the inner wall of the pipeline. After the automatic spraying mechanism works, the automatic screeding mechanism is used to screed a coating immediately, the paint is evenly coated on the inner wall of the pipeline without spiral joints, and missing-spraying is avoided.

The invention discloses a spiral steel pipe shape adjusting auxiliary system and a shape adjusting method. The spiral steel pipe shape adjusting auxiliary system comprises a pipe blank outer support device arranged below a pipe blank head, and a joint closing roller device at a limiting pipe blank head end. The pipe blank outer support device comprises a base and two or more outer support roller mechanisms arranged on the base. Support points of the outer support roller mechanisms are attached to the outer wall of the pipe blank head and are used for supporting a pipe blank to be matched withthe designed pipe diameter of a plan-machined spiral steel pipe. The joint closing roller device comprises a hanging seat, a joint closing roller mechanism slidably limited on the hanging seat, and ajoint closing roller translation mechanism driving the joint closing roller mechanism to achieve translation on the hanging seat towards the meshing center direction of a pipe blank spiral joint. Thejoint closing roller mechanism is provided with a limiting annular groove limiting the limiting pipe blank head end. With adoption of the spiral steel pipe shape adjusting auxiliary system, the technical problems of the low head of the pipe blank head end of the spiral steel pipe and spiral joint misalignment and joint opening near the meshing center of the pipe blank spiral joint are solved.

The invention provides spiral joints which comprise a shaft (1) and spiral blades (2) arranged on the shaft (1), wherein one end of the shaft (1) is provided with a thread. Correspondingly, the invention also provides a main joint section. In addition, the invention also provides a spiral material division device for a paver and the paver. As the spiral joints provided by the invention are in threaded connection with a main shaft of the main joint section, any mechanical equipment is needed, the spiral joints can be conveniently and quickly arranged on the main joint section of the spiral material division device or can be removed from the main joint section, further, the length of the spiral material division device can be conveniently adjusted, so that the requirements of different paving working conditions can be met. In addition, during the working process of the paver, the spiral joints can be screwed by the reverse action of paving materials on the spiral joints, so that the automatic anti-loosening function can be realized.

The invention discloses a height adjustable rotating bookshelf which comprises a threaded post, a first supporting rod, a second supporting rod, a first rotating bolt, a second rotating bolt, bookshelves, a threaded pipe, a base, a spiral joint, a pulley, a supporting leg and a clamping groove, wherein the threaded pipe is sleeved on the threaded post; the first supporting rod and the second supporting rod are welded on the threaded pipe; the tail ends of the first supporting rod and the second supporting rod are provided with the first rotating bolt and the second rotating bolt; the bookshelf is connected between the first rotating bolt and the second rotating bolt; the bookshelves form a bookshelf group by taking every two left and right symmetrical bookshelves as a group and can circumferentially rotate by taking the first rotating bolt and the second rotating bolt as the axis; the bottom of the threaded post is provided with the base; the supporting leg is clamped on the base, takes the center of a circle of the base as the center of a circle and is obliquely inserted in a mode of connecting by adopting a surrounding strip; the clamping groove which penetrates through the supporting leg is formed in the base; the spiral joint matched with the threaded post is formed in the middle of the base; and the pulley is arranged at the bottom end of the base.

The invention discloses an anti-freezing device for a solar water heater. The anti-freezing device comprises a water heater water tank, the interior of the water heater water tank is spirally connected with a siphon and a connecting water pipe through a first three-way valve, the top end of the first three-way valve is connected with an electromagnetic valve, the connecting water pipe is connected with a shower water pipe through a second three-way valve and is connected with a tap water pipe through a third three-way valve, the bottom end of the connecting water pipe is spirally connected with a heating water tank through a spiral joint, the interior of the heating water tank is fixedly connected with a heater through a fixed joint, the fixed joint and the electromagnetic valve are connected with a controller through connecting leads, and a control switch is arranged on the controller. According to the anti-freezing device, the electromagnetic valve is arranged so that water inside the connecting water pipe can be discharged, the connecting water pipe is prevented from being frozen, the connecting water pipe is protected, and therefore the use is convenient and the anti-freezing effect is good.

The invention provides a novel continuous slow liquid feeding apparatus and an installation and application method thereof. The apparatus comprises a spiral joint, a container with an interface, an end cover, a liquid strop film, a liquid storage capsule and one or more layers of hollow nanometer membranes, the liquid strop film is installed in a float, the one or more layers of hollow nanometer membranes pass through intermediate holes of the float and the liquid strop film and are adhered, sealed and fixed to form one body, the float, the liquid strop film and the one or more layers of hollow nanometer membranes are placed in the intermediate hole of the spiral joint together, the end cover and the end surface of the projecting cylinder of the spiral joint are bonded to form one body, the liquid storage capsule is sleeved outside the end surface and the projecting cylinder of the spiral joint, the open end of the liquid storage capsule is tightly fixed to the spiral joint, and the spiral joint and the container with the interface are welded to form one body. According to the invention, long-time continuous positive pressure can be realized, the positive pressure state is maintained for long time through liquid feeding at a time, the liquid feeding can be carried out for multiple times, blood entering the conduit of a detaining needle is enabled to flow slowly, the mount of the blood entering the conduit is also reduced, and thus thrombus obstruction is prevented.

The invention discloses a spiral steel pipe with reinforcing rings and a manufacturing method of the spiral steel pipe. The steel pipe comprises a spiral pipe body formed by spirally winding main steel strips; spiral joints are formed between the adjacent main steel strips of the spiral pipe body; the reinforcing rings are spirally wound on and locked to the outer wall or the inner wall of the spiral pipe body; at the spiral joints, the reinforcing rings are formed by bending narrow steel strips and the sections of the reinforcing rings are circular-arc-shaped, square or trapezoidal. The reinforcing rings are capable of enhancing the overall annular strength of the pipe, the thickness of the pipe can be reduced by more than a half, and the cost can be greatly reduced; meanwhile, the inertia moment of the circumferential section of the pipe is increased exponentially; as a result, the effect of the reinforcing rings is much better than that of a common reinforcement way, and consequently, the deformation problem of a large-diameter steel pipe, in particular a steel pipe of which the diameter is greater than 4m, during production is solved, and a steel pipe with an ultra-large diameter (10m or above) can be produced. Besides, the spiral joints formed between the adjacent sections of the spiral steel pipe are capable of surrounding the reinforcing rings so that the leakage protection at the joints can be strengthened.

The invention provides spiral air force combined powder conveying charging equipment which comprises an air force conveying mechanism and a spiral conveying mechanism. The air force conveying mechanism comprises a feeding pipe, a spiral joint and a first conveying pipeline. A first feeding port is formed in one end of the feeding pipe, and the other end of the feeding pipe communicates with the first conveying pipeline through the spiral joint. The spiral conveying mechanism comprises a second feeding port, a motor for driving the first conveying pipeline, a spiral blade and a second conveyingpipeline, and a second feeding port is formed in the side wall of the second conveying pipeline. The spiral blade is arranged on the pipeline outer wall of the first conveying pipeline, and the spiral blade is fixedly connected with the pipeline outer wall of the first conveying pipeline. According to the spiral air force combined powder conveying charging equipment, an air force conveying mannerand a spiral conveying manner are combined, and the loading speed is increased through the air force conveying manner; after a cabinet bag is full of powder, the powder continues to be conveyed through a spiral manner, the powder in the cabinet bag is compacted, the loading amount of the powder in the cabinet bag is increased, and conveying cost is reduced.

The invention discloses a closed type lentiviral vector culturing device and a lentiviral vector culturing method. The culturing device consists of a box body, a valve, a connecting pipe, a Q-syte diaphragm closed type needle-free joint, a Luer-Lock injector, a filter and a closed bolt, wherein the box body is formed by closely jointing an upper box piece and a lower box piece; the upper box piece and the lower box piece are fixed under a rigid frame; the central parts of the upper box piece and the lower box piece are sunken towards the outer side of the box body, so that a rectangular containing cavity is formed; variable cross-section cylindrical channels are respectively arranged at the left side and the right side of the box body, and a mother slot connecting tube is fixed in each channel; a joint of the Luer-Lock injector is a spiral joint. Before the culturing device is used, culture mediums of transduction plasmids, 293 T cells and Huh 7.5.1 cells, primary hepatocyte culture mediums and primary hepatocyte tissue are firstly prepared; the culturing device is used for culturing so as to obtain lentivirus supernatant; primary hepatocytes are used for carrying out transfection on the lentivirus supernatant; the lentiviral vector is finally obtained after being cultured for a certain number of days.

The invention relates to an open oil seal with seal interference. The open oil seal comprises an open annular bottom ring, an open annular skeleton with a rectangular section is arranged in the bottom ring, a tenon and a groove which are matched are arranged at two ends of the skeleton, an open annular waist part is connected with an open annular edge ring at the inner circumference of the bottom ring, an open annular seal lip is arranged at the inner circumference of the edge ring, an open annular two-way spiral spring skeleton is arranged in the edge ring and has two sections which have equal length and opposite spiral directions, the circumference length of the inner circumference of the edge ring is less than that of a matched rotating shaft, a two-way spiral joint matched with a spiral hole in the two-way spiral spring skeleton is connected between the spiral springs, with opposite spiral directions, at two sides of an opening of the edge ring, the two-way spiral joint has two sections which have equal length and opposite spiral directions, and the two-way spiral joint is internally connected with a short cylinder core on which a radial hole is arranged. When the open oil seal is in use, not only does the seal specific pressure produced by the deformation of the edge ring exist, but also the seal specific pressure produced by the seal interference exists, and the sealing property is good.

The invention relates to the field of acetabular cup installation, and particularly relates to a surgical instrument for mounting an acetabular cup. The surgical instrument comprises a handle and an installer connecting rod fixedly connected to one end of the handle. The surgical instrument further comprises a spiral connector detachably installed at the end, away from the handle, of the installerconnecting rod, and a buffering cushion used for abutting against the inner wall of the installed acetabular cup is arranged on the spiral connector. The surgical instrument has the effect of reducing the possibility of deformation of the threads on the screw joint.

The invention discloses a fast joint for compact superconductive cyclotron's high frequency resonator coaxial waveguide. The fast joint comprises an internal conductor and insulation supports. The internal conductor is of a cylindrical shape; the outer side wall of the internal conductor is provided with a middle section as well as spiral joint sections at two sides of the middle section. The outer side walls of the internal conductor among the middle section and the spiral joint sections are provided with two anti-current grooves. A circumferential protrusion part is arranged between the two anti-current grooves. The circumferential side wall of the middle section is provided with three installation holes. Each installation hole is provided with an insulation support. The insertion end of each insulation support is in threaded connection with a spring. The spring is fixedly connected to the installation hole. The outer end of the insulation support undergoes a fillet processing. The two end faces of the middle section are provided with a first step respectively. The outer end faces of the two spiral joint sections are provided with second steps. Simple in structure and small in size, the fast joint enables the convenient and rapid installation, maintenance and replacement of a coaxial waveguide.

A silencing swirling flow tee of a single-spiral joint pipe is characterized by comprising a main body of the tee, the main body is provided with an upper joint, a side spiral pipe and a lower joint, the upper joint is connected with an upper connection cover, the upper connection cover is provided with a bell and spigot outer pipe, the outer wall, positioned at the main body, of the side spiral pipe is provided with an arc bulge, the inner wall, positioned in the main body, of the side spiral pipe is provided with an inner sloping baffle and a lower baffle, a spiral hole is formed among the arc bulge, the inner sloping baffle and the lower baffle, the lower joint is connected with a swirling flow pipe, the swirling pipe comprises a bell and spigot inner pipe at the upper part, the bell and spigot inner pipe is in insertion match with the inner wall of the lower joint, a circular truncated cone pipe is arranged at the bell and spigot inner pipe, a lower straight pipe is arranged under the circular truncated cone pipe, a lower bell and spigot pipe is arranged under the lower straight pipe and arch and oblique swirling blades are arranged at the inner walls of the circular truncated cone pipe and the lower straight pipe.

The invention relates to an infusion apparatus with an elastic device, and the infusion apparatus can be used for effectively solving the problem that the existing infusion apparatus cannot automatically infuse and needs to infuse by using gravity or a power source. According to the technical scheme, the infusion apparatus comprises a catheter, a three-way medicating valve and a stop clamp; the lower end of the three-way medicating valve is connected with a micro-adjuster through the catheter; the micro-adjuster is connected with a liquid medicine filter through the catheter; the liquid medicine filter is connected with a spiral joint through the catheter; an intravenous infusion needle is mounted on the spiral joint; the upper end of the three-way medicating valve is provided with an elastic infusion device through the catheter; the elastic infusion device comprises a sealed sleeve; a spring is arranged in the sleeve; a sealing ring is arranged at the lower part of the spring; a liquid storage area is formed between the sealing ring and the sleeve; the liquid storage area is connected with the catheter; and the stop clamp is arranged on the catheter. The infusion apparatus provided by the invention has the advantages of novel and special structure, convenience in use and wide using range, thereby being an innovation in the infusion apparatus.

The invention discloses an injection molding system for improving injection molding accuracy in mold injection. A power mechanism, a feed mechanism, a forming mechanism, a de-molding mechanism and a de-molding power mechanism are orderly connected. An injection molding mechanism is connected with the feed mechanism. The injection molding mechanism is communicated with the interior of a charging barrel. A screw is arranged in the charging barrel. A spiral joint is sleeved on the outer wall of the screw. The screw is connected with the power mechanism. The screw is sleeved with a non-return valve. The non-return valve is connected with the charging barrel in a seamless way. The charging barrel is sleeved with a heater. The charging barrel is connected with a cone table. The cone table is communicated with the interior of the charging barrel to form an integrated structure. The cone table is indented to form a circular groove. The forming mechanism is indented to form a pit. The cone table contacts the pit in a seamless way. The pit bulges to form a circular boss. A circular boss wall contacts the circular groove. The circular boss contacts the circular groove. By matching the cone table with the pit in a large scale, and accurately matching the circular boss with the circular groove, the system enables the charging barrel to contact the forming mechanism tightly and accurately and avoids outflow phenomenon of the melt.

Spiral forming methods can be used to join edges of a rolled material along a spiral joint to form conical and / or cylindrical structures. Alignment of the edges of the rolled material can be controlled in a wrapping direction as the material is being joined along the spiral joint to form the structure. By controlling alignment of the edges of the material as the edges of the material are being joined, small corrections can be made over the course of forming the structure facilitating control over geometric tolerances of the resulting spiral formed structure.

The invention discloses a dumbbell capable of preventing dumbbell discs to rotate. The dumbbell comprises a dumbbell rod and the dumbbell discs. The dumbbell discs are fixedly installed on the inner sides of the two ends of the dumbbell rod through limiting sleeve discs, and the dumbbell discs are isolated and limited through a bolt bar, the bolt bar penetrates through threaded hole in the dumbbell rod and the limiting sleeve discs to be connected with a limiting nut, the two ends of the limiting sleeve disc are each provided with a dumbbell rod stop piece and a nut lantern ring plate respectively, a grip cover is installed between the dumbbell rod stop pieces on the left and right sides, a plurality of sweat absorption groove holes are formed in the outer side of the grip cover, the dumbbell rod is of a cylindrical structure with spiral joints at the two ends, limiting pin shafts are symmetrically installed at the two ends of the dumbbell rod, rotation of the dumbbell discs is greatly avoided, and the use safety of a user is improved.

Disclosed is a nasobiliary drainage device. The problems are effectively solved that the time and effort are consumed in the connection of current drainage bag joints, the current drainage bag joints easily fall off, drainage tubes are contaminated, the drainage amount is recorded inaccurately, the color interpretation is inconsistent, and the judgement of clinical related complications is affected. The nasobiliary drainage device comprises a drainage tube, a spiral joint is arranged on the upper portion of the drainage tube, the bottom of the spiral opening of the spiral joint is concave, the lower end of the spiral joint is connected with the drainage tube, the drainage tube is provided with a specimen maintaining and fetching opening located below the spiral joint, the right end of the specimen maintaining and fetching opening is connected with a cover cap, the lower end of the drainage tube is connected with a kettle part, and the lower end of the kettle part is provided with a fluid discharge switch. The drainage device can be effectively prevented from slipping, the color of drainage fluid is observed conveniently, a specimen of the drainage fluid can be conveniently maintained and fetched, the work efficiency of medical staff is improved, the occurrence of nosocomial infection is reduced, and the risk of related occupational exposure is effectively reduced.

The invention relates to an ventilationair exchanging device special for a distillation tower. The ventilationair exchanging device comprises a protective shell, an exhaust opening is formed in the top of the protective shell and connected with an exhaust pipeline, and a one-way valve is arranged at the top of the exhaust pipeline; the exhaust pipeline is connected with a main pipe, the main pipeextends out of a spiral joint at the bottom of the protective shell, and an air inlet pipeline is connected into the spiral joint; the main pipe and the air inlet pipeline are fixed into the spiral joint through a fixing device, the air inlet pipeline is longer than the main pipe, and the top of the air inlet pipeline is connected with a filtering device; the filtering device is connected with a pipeline through a fixing piece, wherein the pipeline extends to the outer side of the shell; and a valve is arranged on the pipeline, and an air pressure meter is arranged at the bottom of the shell.According to the ventilationair exchanging device, the air inlet rate is increased through the air inlet pipeline, the cleanness and quality of inlet air are improved through the filtering device, a pressurizing chamber is connected with a nozzle, the work efficiency is improved, the main pipe has the abrasion-resistant, heat-resistant and compression-resistant effects, the service life is prolonged, and the firmness of pipe fittings is improved through the fixing piece.

The invention relates to the technical field of medicine and provides a packing method for propofol injections. The packing method comprises the steps of medicine liquid filling, deoxygenization, piston installation, sealed storage for prefilled syringes and the like. A packing device for the propofol injections comprises a syringe, a piston, a rubber plug protecting cap and a push rod. A Luer connector is arranged at the top end of the syringe. The outer surface of the Luer connector is sleeved with a spiral connector. The rubber plug protecting cap is installed at the top end of the spiral connector. By means of the packing method for the propofol injections, the waste caused by adsorption or transfer in the using process of the propofol injections can be reduced; repeated suction of the propofol injections in the using process is avoided, and the chances of secondary pollution are reduced; the packing device can be used by medical personnel directly and conveniently, and time for clinical application is saved; the storage time of the propofol injections can be prolonged.