63results about How to "No reverse flow" patented technology

The invention provides a needleless connection type infusion apparatus. The needleless connection type infusion apparatus comprises an infusion catheter and an intravenous infusion needle between which a connection pipe is arranged; an external taper joint in match with an intravenous infusion needle holder is arranged at the rear end of the connection pipe; the front end of the connection pipe is connected with the infusion catheter through an one-way valve; a branch pipe is arranged on the connection pipe; the distance from the part in which the branch pipe is connected with the connection pipe to the one-way valve is less than 10cm, and the distance to the external taper joint is less than15cm; a rubber plug on which a liquid inlet channel is positioned is arranged in the branch pipe; an elastic valve in match with an infusion needle is arranged on the top of the liquid inlet channel; the elastic valve can be automatically closed after the infusion needle is pulled out. According to the needleless connection type infusion apparatus, medicine liquid is quickly added to the connection pipe through the infusion needle without a steel needle, the one-way valve at the front end of the connection pipe can prevent the medicine liquid from reverse flowing, thus the medicine liquid can quickly enter a human body; in addition, the infusion needle without the steel needle can prevent a nurse from being punctured to cause cross infection.

The invention discloses an extruding molding device. The extruding molding device comprises a feeding mechanism and a shaping mechanism, wherein the feeding mechanism is used for extruding raw materials into the shaping mechanism to be shaped; the feeding mechanism comprises a machine barrel communicated with the shaping mechanism, a screw rod (12), a heater (13), a hopper (14) and a motor (15); the hopper is vertically arranged above the machine barrel and is communicated with the machine barrel; the heater is arranged on the outer side wall of the machine barrel; one end of the screw rod extends into the machine barrel and the other end of the screw rod is connected with the motor by a retractable rod (16); the motor can drive the screw rod to rotate around the axial direction and moves along the length direction of the screw rod, so that the raw materials melted in the machine barrel are extruded out of the machine barrel to be conveyed to the shaping mechanism; and a non-return valve (17) is arranged in the machine barrel and the non-return valve can be tightly combined with the end part of the screw rod to seal the inner cavity of the machine barrel. The extruding molding device can be used for preventing high molecular materials from a reverse flow phenomenon in an extruding molding process, and the success rate of extruding molding is improved.

The invention relates to a semi-hermetic piston-type compressor. The semi-hermetic piston-type compressor comprises a motor cavity, a motor, a crankcase, a crankshaft and a cylinder piston connecting rod component; the semi-hermetic piston-type compressor is characterized in that: a long shaft side of the crankshaft is provided with a pressure balanced hole and a pressure balanced pipe; the pressure balanced hole is a through hole which is formed from the end face of the long shaft side of the crankshaft along the axis direction of the long shaft side of the crankshaft inside the long shaft side of the crankshaft to the end face of a crank, which is arranged in the crankcase, of the crankshaft adjacent to the long shaft side of the crankshaft; one end of the pressure balanced pipe is communicated with the pressure balanced hole; the other end of the pressure balanced pipe is communicated with the motor cavity; an included angle between the axis of the pressure balanced pipe and the axis of the long shaft of the crankshaft is between 0 and 90 degrees; a lowest part of a clapboard between the motor cavity and the crankcase of the semi-hermetic piston-type compressor is provided with a one-way valve; an input port of the one-way valve is formed at one side of the motor cavity; and an output port of the one-way valve is formed at one side of the crankcase. The semi-hermetic piston-type compressor has the remarkable advantages that: a few parts are used to solve the problem of inner oil return of the compressor, and the semi-hermetic piston-type compressor has low manufacturing cost, high oil return efficiency, simple structure, simple machining and manufacturing, and safety and reliability.

The invention relates to a drive circuit and a power converter containing the drive circuit. The power converter comprises a main switch controlled by a driving signal, a main transformer receiving an input power supply in a switching way by the main switch, and a switching circuit which outputs a synchronizing signal and comprises a switch used for determining the receive status of an external connection load power supply; the drive circuit includes a dead pole time controller and an opposite phase generator; wherein, the dead pole time controller is provided with a second switch and a fourth switch, and the fourth switch is controlled by the synchronizing signal to control the conducting state of the second switch; the opposite phase generator is provided with a first switch and a fifth switch which are controlled by the driving signal, and the fifth switch is controlled by the first and the second switches to output a switching signal that has the opposite phase to the driving signal, and the switching circuit is controlled; furthermore, dead pole time spacing is kept between the synchronizing signal and the switching signal. The invention can actively modify the switching signal, ensures the phenomenon of reverse current not to occur, leads the circuit to be synchronous and improves the drive capability by using the drive circuit.

The invention relates to seawater desalting equipment and in particular relates to welding chromium alloy atoll seawater separating and desalting equipment without power consumption or oil consumption. A primary output shaft is welded and fixed with a coupler input welding groove of a chromium alloy welding head six-edge flexible coupler, a coupler output welding groove of the chromium alloy welding head six-edge flexible coupler is welded and fixed with a low pressure pump input shaft of a low pressure centrifugal pump, a lifting water inlet pipe of the low pressure centrifugal pump is connected with a seabed water filter; a lifting water outlet pipe of the low pressure centrifugal pump penetrates through a water pipe sealing hole of a separation wall from outside to inside to be connected with a spare pre-treatment tank; a high pressure pump water suction pipe of a high pressure centrifugal pump is connected with the spare pre-treatment tank, a high pressure pump water outlet pipe of a high pressure centrifugal pump is connected with an osmosis membrane front cavity of a reverse osmosis membrane assembly; an osmosis membrane rear cavity of the reverse osmosis membrane assembly is sequentially connected to an activated carbon adsorption tank and a fresh water storage tank, and the welding chromium alloy atoll seawater separating and desalting equipment is improved in the aspect that the high pressure pump water suction pipe and the high pressure pump water outlet pipe are respectively connected with a horizontal welding head non-return device in series.

The invention discloses a centrifugal type non-contact wetting device of an offset machine. The centrifugal type non-contact wetting device is used for supplying water to a main water roller of the offset machine. The main water roller transmits water to a printing plate on a printing plate barrel through a water roller set. The wetting device comprises a water hopper, and the water hopper is provided with a water spraying port facing the main water roller. A mesh barrel is installed in the water hopper, the inner wall of the mesh barrel is provided with a water absorption material layer, the water hopper is internally provided with a water spraying device, the mesh barrel is connected with a power device driving the mesh barrel to rotate, the mesh barrel is driven by the power device to rotate at a high speed to throw water away via centrifugal force so that the water can be supplied to the main water roller, the main water roller transmits the water to the printing plate on the printing plate barrel through the water roller set, the advantages of non-contact wetting are reflected, printing ink cannot flow reversely, the stepless speed change for the water supplying quantity can be achieved by controlling the revolving speed of the mesh barrel, the water quantity can be accurately controlled, and printing quality is improved.

The invention discloses efficient environment-friendly energy-saving natural gas pressure feeding equipment which structurally comprises a fixed top tray, an intelligent pressurizing device, a connecting pipeline, a pressure meter, a connecting ring, an open-close valve, an electronic digital display screen and a bolt, wherein the fixed top tray is meshed with the bolt through a thread; and the lower surface of the fixed top tray is connected with the upper surface of the intelligent pressurizing device. According to the efficient environment-friendly energy-saving natural gas pressure feedingequipment, due to existence of self alford force, an airflow brake device is driven, and a rotating mechanism drives a power generation device to generate electricity, so that energy is stored for amotor; and through the remote intelligent control motor, a lifting mechanism drives a transmission mechanism, and finally, the pressurizing process of a natural gas pipeline is realized, so that the natural gas pressure feeding effect is improved, the size and energy application are greatly saved, the practicality and range of application of the equipment are improved and enlarged.

The invention belongs to special generators for sea water desalination and relates to a fresh water generator with a copper alloy disc type trapezoidal magnet generator and screw joints. For improvement, a pressurizing internal screw joint is hermetically and fixedly connected with an external screw of the lower end of a conversion high-pressure pipe, a vertical screw constant-direction inverter is serially connected between an inlet of a low-pressure lift pump and a low-pressure suction pipe, a horizontal screw constant-direction inverter is serially connected between an inlet of a high-pressure make-up pump and a water replenishing suction pipe, a screw pressure exchange lift pump consists of a pressure lift screw pump portion and a screw pressure switch portion, and the pressure lift screw pump is driven by the disc type trapezoidal magnet generator; a permanent magnet section of the disc type trapezoidal magnet generator is in a shape of an isosceles trapezoid, an axial magnetic field is increased gradually from inside to outside, saturation at the inner periphery of the magnetic field is avoided, and permanent magnet utilization efficiency is increased. In addition, since a conical air gap is formed among a stator core, a rotor core and a permanent magnet, effective area of the air gap is increased, and the permanent magnet utilization efficiency is further increased.

The invention relates to a thyroid puncture injection suction device, which comprises a needle tube and a needle body installed at the front end of the needle tube. The needle tube has an injection channel and a negative pressure suction channel, and the injection channel and the negative pressure suction channel are connected to the needle body. The channel is connected; the injection channel is provided with a piston, the end of the piston is connected to the push handle, and a one-way valve is installed at the entrance of the injection channel; there is a valve block on the negative pressure suction channel, and there is a valve block on the needle wall. The negative pressure suction channel communicates with the through hole, and the valve block is connected with a button, and the button controls the sliding of the valve block up and down in the through hole. The beneficial effects of the present invention can realize injection and suction behaviors on one needle tube, and have little influence on the position of the needle tip, so that the operation is simple after the puncture is in place, and the injection point deviation and accidental damage caused by the displacement of the needle point caused by hand-handed operation are avoided.

The invention relates to earthen stove water heaters, solves the problems of energy singleness and heavy vibration of water heaters, and particularly relates to a vibration-insulating type composite-energy water heater that is capable of recovering and reutilizing heat released by an earthen stove and the sun and has good heat exchange and vibration insulation effects. The composite-energy water heater comprises an earthen stove hot water circulation loop, a solar energy hot water circulation loop, and a vibration-insulating support, wherein the earthen stove hot water circulation loop comprises a water box and a heating coil, and the solar energy hot water circulation loop comprises the water box and a solar thermal collector. The earthen stove hot water circulation loop also comprises a circulation pump. The vibration-insulating support comprises a support body supporting the water box and the circulation pump, and rubber supporting feet. The bottom surface of each rubber supporting foot is provided with a liquid storage cavity and an insulation plate in the liquid storage cavity. Each insulation plate separates the corresponding liquid storage cavity into an upper liquid storage cavity and a lower liquid storage cavity and is provided with main damping channels communicating the corresponding upper liquid storage cavity and the corresponding lower liquid storage cavity. The main damping channels are provided with energy absorption plates. The energy absorption plates are provided with damping bars capable of sliding up and down. The damping bars are provided with branch damping channels. The lower end of each lower liquid storage cavity is provided with a U-shaped rubber cover arching towards the inside of the corresponding lower liquid storage cavity.

The invention discloses an intelligent rear-drive assembly of a rear axle of an electric vehicle and belongs to the technical field of electric vehicles. The intelligent rear-drive assembly of the rear axle of the electric vehicle comprises a differential mechanism, a motor, a controller and a pair of half axles, wherein the motor is used for providing power input for the differential mechanism, the controller is used for controlling the working state of the motor, and the pair of half axles is mounted at the power output end of the differential mechanism. An oil injection assembly and a liquid level monitoring assembly are mounted on a differential mechanism shell of the differential mechanism. The liquid level monitoring assembly can be used for monitoring whether oil in the differential mechanism shell exceeds a rated liquid level or not in the oil injection process. The oil injection assembly and the liquid level monitoring assembly are mounted in positions close to the middle portion of the differential mechanism shell. The oil injection assembly comprises a guide part, an oil injection base detachably inserted on the differential mechanism shell, and screws, and the installation position of the oil injection base is lower than the installation position of the liquid level monitoring assembly. Whether the oil level reaches the rated oil level or not is monitored in the process of injecting oil into the differential mechanism shell, and the oil injection process can be conducted conveniently; and the backflow phenomenon is avoided, and the air tightness is good.

The invention belongs to a method for desalting seawater by applying equipment, and discloses a method for desalting seawater by applying a squirrel-cage water-cooled motor and zirconia ceramic weld seam equipment. The equipment comprises a seawater pretreatment pool, a low-pressure suction pipe, a low-pressure lifting pump, a water replenishing suction pipe, a high-pressure make-up pump, a pipeline tee joint, a reverse osmosis membrane and a weld seam pressure exchange lifter pump; as an improvement, an assembly method of a squirrel-cage IV-type water-cooled motor, connection steps of a weld seam joint pipeline, a working flow of a union pressure exchanger and a reverse osmosis seawater desalting working process are as follows: I, the assembly method of the squirrel-cage IV-type water-cooled motor; II, the connection steps of the weld seam joint pipeline; III, a working flow of a weld seam pressure exchanger; IV, the reverse osmosis seawater desalting working process. The method for desalting the seawater by applying the squirrel-cage water-cooled motor and the zirconia ceramic weld seam equipment adopts a weld seam connecting structure, is resistant to high pressure, and has no leakage; particularly, the weld seam pressure exchange lifter pump is arranged additionally; a suction opening of a supercharging pump on a pressure lifting weld seam pump part is directly aligned with a supercharging central discharge hole in a weld seam pressure exchanger part; a structure is compact; an energy-saving effect is obvious.

The invention discloses a double-battery circuit of a law enforcement instrument. The circuit comprises an IC chip U101, the U101 is connected with a system power bus; the system power bus is connected in parallel with a backup battery and a main battery. A Schottky diode D401 and a Schottky diode D402 are connected in series between the backup battery and the connection node of the main battery and the system power supply bus; the positive electrode of the Schottky diode D401 is connected with an IC chip U101, the main battery is further connected with an IC chip U102, and the negative electrode of the Schottky diode D402 is connected with the IC chip U102. The design is simple, the cost is low, functions of a backup battery required by the technical requirement of the law enforcement instrument are met, system power supply is directly supplied by a main battery without passing through an MOS switch, extra MOS voltage drop cannot be generated, when the two batteries are charged, the two batteries are provided with independent charging ICs, and the problem that the batteries cannot be charged due to over-discharge is solved.

The invention discloses an on-line automatic crude oil sampling system. The on-line automatic crude oil sampling system comprises a probe, a first electromagnetic valve, a filter and a main driving pump which are sequentially connected, wherein an outlet of the main driving pump is connected with a first inlet of a third three-way valve; a second inlet of the third three-way valve is connected with a blowing device; an outlet of the third three-way valve is connected with an inlet of a sampling device; an outlet of the sampling device is connected with an inlet of a fourth three-way valve; a first outlet of the fourth three-way valve is connected with a first inlet of a fifth three-way valve; a second outlet of the fourth three-way valve is sequentially connected with a heat tracing system and an on-line water analysis and detection system; the on-line water analysis and detection system is connected with an outlet and a second inlet of the fifth three-way valve; and an outlet of the fifth three-way valve is sequentially connected with a pressure transmitter, a one-way valve and a second solenoid valve. The system can achieve the on-line detection of the crude oil pipeline and the automatic cleaning function after the detection.

The invention discloses a water draining siphon trap, comprising a siphon trap body, a water sealing bowl and a water sealing cylinder, wherein, six bottom surfaces of the siphon trap body 6 protrude to form vertex parts, and a bevel surface downgoing continuously is arranged from the vertex parts to the lowest end of an outlet opening toward the two sides. In addition, an anti-foam pipe is arranged also and a guide part of the anti-foam pipe is provided with a through hole or a cut groove. The water draining siphon trap ensures that the phenomenon that the foam does not flow to one side of a machine reversely does not exist in the draining environment that the washing machine or a bathtub is surrounded by a large amount of foam, makes the drainage smooth, increases the drainage flow rate, and can prevent the water draining siphon trap from breaking a seal.