55results about How to "No backflow phenomenon" patented technology

The invention relates to an electrically controlled hydrogen-spraying pressure regulating device of a fuel cell system, which is used for controlling air inflow at the hydrogen side of the fuel cell system. The electrically controlled hydrogen-spraying pressure regulating device comprises a fuel cell stack which is used for performing reaction of a hydrogen fuel cell to generate electric energy; a hydrogen side inlet pressure control component which is connected with a hydrogen inlet pipe of the fuel cell stack and is used for controlling an inlet pressure of the hydrogen and backflow of the hydrogen; a draining component which is connected with a hydrogen drain pipe of the fuel cell pack and is used for draining wastewater; and a controller which is respectively connected with the hydrogen side inlet pressure control component and the hydrogen draining component and is used for controlling the hydrogen side inlet pressure control component and the hydrogen draining component and regulating the hydrogen inlet side pressure. In comparison with the prior art, the electrically controlled hydrogen-spraying pressure regulating device of the fuel cell system has the advantages of improving the working environment of the fuel cell, being safe and reliable, being capable of preventing backflow, keeping the temperature of the returned hydrogen and the like.

The invention discloses an alloy material of copper, nickel, silicon and bronze and a preparation method thereof. The alloy material comprises the following substances in percent by weight: 1.6% to 2.2% of nickel, 0.4% to 0.8% of silicon, 0.008% of rare earth alloy and 96.002% to 97.002% of copper. The alloy material of copper, nickel, silicon and bronze is prepared by the processes of proportioning, melting, casting, sawing, extruding, drawing, straightening, inspecting and packing into a warehouse, enhances the stress corrosion resistant capability, and has the main performance change of reducing a hardness value and the grain size.

The invention discloses an updated heavy oil desalting and dewatering device. The device is composed of an electrical desalting tank, a transformer and a high-voltage electronic joint device, an oil inlet main pipe, oil inlet branched pipes and flow regulating valves, wherein an upper electric field in the electrical desalting tank consists of at least one electric field unit and adopts the multiple electric field distribution technology of single power supply, each electric field unit consists of a drip tray, a live electrode, a grounding electrode, an oil inlet nozzle, a backwashing device and a down pipe; and a fast dewatering and draining device consists of a V-shaped drip tray, a backwashing device and a down pipe, a backwashing nozzle and the bottom surface of the drip tray forms an inclination, the top of the down pipe is connected with the bottom of the drip tray, and the other end is inserted in the water layer of the electrical desalting tank. The field intensity of the upper electric field of the device is optimized, fast dewatering and draining can be ensured, the desalting efficiency is increased; and the updated heavy oil desalting and dewatering device is suitable for the deep desalting and dewatering treatment of crude oil, particularly heavy crude oil, fuel oil and other heavy oil products.

The invention relates to a water-saving toilet stool, in particular to a water-saving toilet stool using micro-quantity of water, which is suitable for hotels, households, enterprises and public institutions, public toilets and the like. The water-saving toilet stool comprises a toilet stool, a water tank, a water pump, a booster jar, a foaming agent storage tank, a foam generator and a miniature air pump, wherein a sanita is arranged in the middle of the toilet stool; a foam input joint is arranged on the upper part of the sanita; a flushing channel is formed inside the upper part of the sanita; a movable cover plate is arranged at the outlet of the sanita; a pedestal pan cover is arranged on the upper part of the sanita; the water tank, the foam generator, the foaming agent storage tank and the miniature air pump are arranged on the upper part in the rear tank of a pedestal pan; the water pump and the water booster jar are arranged on the lower part of a toilet stool shell; the water tank is provided with a water tank body; a float valve is arranged inside the water tank body; a water inlet is formed on the water tank body and is communicated with tap water; a first water outlet is connected with the water pump; a second water outlet is connected with the foam generator through a second check valve and supplies water to the foam generator; and the second check valve prevents liquid in the foam generator from flowing into the water tank.

The invention provides an air-flow / bubble spinning device. The spinning device comprises an air flow chamber and an air flow generator. A liquid storing device is arranged on one side of the air flow chamber, and is directly connected with a bubble generator via a communication pipe. The air flow chamber is communicated with the communication pipe via a three-way pipe. A nano-particle container is arranged on the communication pipe between the air flow chamber and the liquid storing device. An electric heating assembly is arranged on the bubble generator. A receiving device is arranged right above the air flow chamber. According to the invention, bubbles suddenly blast when meeting the electric heating assembly and stretched in the high-speed airflow field, so prepared nano-fibers are very thin and yield is higher; without any static electric process, so the whole device is highly safe and easy to control; by adding nano-particles in the air flow chamber via the nano-particle container, nano-thin films can be mixed with the nano-particles more uniformly in the spinning process, so various kinds of fibers can be effectively prepared; and by controlling shape and nature of the particles, appearance of the fibers can be precisely controlled.

The invention discloses a chromium bronze alloy material and a preparation method thereof. The chromium bronze alloy material consists of chromium, tin, titanium, 0.006 to 0.012 percent of rare earth and 98.518 to 99.394 percent of copper. The preparation method for the chromium bronze alloy material comprises the manufacturing steps of batching, smelting, casting, extruding, stretching, straightening and finished product inspection and detection. Through the chromium bronze alloy material and the preparation method thereof, the prepared chromium bronze alloy material has good elastic recovery capability and smaller grain size; and because of the adoption of an advanced process method in the process, the quality of the chromium bronze alloy material is greatly improved, and meanwhile the service life of processing equipment is prolonged.

The invention relates to a water processing device and a machining method of the water processing device, in particular to a static pouring column type membrane component and a machining method of the static pouring column type membrane component. The membrane comprises a shell, membrane wires, a water inlet, a water outlet, a spare opening and a concentrated solution outlet. The water inlet and the water outlet are provided with resin ends. The water processing device and the machining method are characterized in that the resin at the resin ends is flexible resin and fixes the two ends of the membrane wires, the diameter of water inlet holes ranges from 8 mm to 20 mm, and the number of water inlet holes ranges from 5 to 20. The machining method of the membrane component includes the steps of membrane wire drying, membrane wire fixing, membrane wire cutting, membrane wire pouring and resin solidification. The membrane wires of the column type membrane component are evenly distributed, firmly fixed at the ends and not prone to damage, and the membrane wire utilization rate and the long service life of the membrane component are effectively guaranteed; by means of the machining method, the problems that the membrane wires are unevenly distributed, high in number adjustment difficulty and unsmooth and not straight are solved effectively, and effective input and output of original water are guaranteed.

The invention discloses a flow-adjustable mechanical automatic infusion instrument which comprises an infusion bag (1), an infusion tube (2) and an infusion needle (3). The infusion bag (1) is arranged in a sealed air pressure bag (4), the infusion tube (2) connected with the infusion bag (1) penetrates out of the air pressure bag (4) and then is connected with the infusion needle (3), the air pressure bag (4) is communicated with an airbag (5), and a mechanical speed adjusting device (6) is arranged on the infusion tube (2). The flow-adjustable mechanical automatic infusion instrument has the advantages that the flow-adjustable mechanical automatic infusion instrument is convenient to use and practical, reliable in work and free of power consumption, the air pressure bag and the mechanical speed regulating device can be reused, cost is low, infusion speed is adjustable, and the control precision is high.

The invention discloses a novel bleeding-stopping device for the obstetrics and gynecology department. The novel bleeding-stopping device comprises an air suction hole, wherein the right side face ofthe air suction hole communicates with the left side face of a charging air bag, the right side face of the charging air bag communicates with the left side face of a connecting base, the right side face of the connecting base communicates with the left end of an air inflation catheter, and a deflation valve is arranged on the upper surface of the air inflation catheter. For the novel bleeding-stopping device for the obstetrics and gynecology department, due to the arrangement of a pull handle, springs, a mandrel, a piston, a needle cylinder, a needle file, an infusion tube, an infusion valveand an administration layer, the pull handle is enabled to drive the mandrel to move downwards, so that the mandrel drives the piston to move downwards, the piston squeezes a medicinal agent in the needle cylinder when moving downwards in the needle cylinder, thus the medicinal agent can enter the administration layer through the infusion tube, the medicinal agent passes through a second through hole to enter a bleeding-stopping sponge layer, therefore, medicine treatment is carried out on a pregnant woman, in addition, the bleeding stopping process is accelerated, after injection of the medicinal agent, the infusion valve is closed, and thus the medicinal agent can not generate the backflow phenomenon.

A synchronous rectification control method of a switching power supply mainly comprises the following step that a synchronous rectifier tube is controlled, wherein a feedback signal is received, and a dynamic judgment is made according to the feedback signal; when the feedback signal meets a set dynamic control reference value, a synchronous rectification control signal is output, and the synchronous rectifier tube is controlled to enter a dynamic working mode; a response is made directly to the feedback signal, so the synchronous rectifier tube starts to make an adjustment prior to a main power circuit, and then the synchronous rectifier tube has corresponding adjustment and control when the main power circuit has a sudden change; besides, when the main power circuit performs adjustment and control, the synchronous rectifier tube still has corresponding adjustment and control. Compared with the prior art, the backward flowing phenomenon caused by untimely adjustment of the synchronous rectifier tube under the condition that the duty ratio of the switching power supply has a sudden change is avoided, and the reliability of synchronous rectification control is improved substantially.

The invention discloses a water channel device with an ozone disinfection function. The water channel device comprises at least one water channel body (1), a downcomer assembly (14) and an ozone generator (13), a downcomer cover (5) is arranged on each water channel body (1), a cover plate (9) is also arranged on the water channel body (1) communicated with the ozone generator (13), one end of the cover plate (9) is locked together with or released from the other side of the water channel body (1) through a locking device, and a stop valve (15) is arranged on one end, close to a sewage pipe (16), of the downcomer assembly (14). After the structure is adopted, on one hand, ozone in the water channel is isolated from the intersection with air outside the water channel so as to avoid damage to a human body; on the other hand, under the matching use of the stop valve, the ozone concentration in the downcomer assembly can be guaranteed and resources can be greatly saved.

The invention provides a variable-displacement rotary swash plate compressor. The variable-displacement rotary swash plate compressor is characterized in that a cylinder block is connected with a rear cover through a valve plate assembly, the middle of the rear cover is provided with a suction cavity and an exhaust cavity, a circular partition rib is arranged between the suction cavity and the exhaust cavity, a silencing cavity is arranged in the middle of the exhaust cavity, and a check valve is arranged between the circular partition rib and the silencing cavity; the bottom end face of a suction port of the cylinder block is an inclined drag reduction face. Due to the fact that the silencing cavity and the check valve are arranged in the exhaust cavity of the rear cover, high-pressure air flows passing through the inner side and the outer side of the rear cover can flow more stably, back flowing is avoided, and air flow noise is weakened; owing to the inclined drag reduction face arranged at the bottom end of the suction port of the cylinder block, air flows in different directions tend to be uniform after air enters the suction port and flows through the drag reduction face, the air flows are orientated, resistances of the air flows are reduced, and accordingly power consumption is reduced, and energy efficiency of the compressor is improved.

The invention relates to a non-breaking corn hoister. The non-breaking corn hoister is characterized by being composed of a machine shell (1), a feeding hopper (6), a bottom wheel set (2), a head wheel set (10), tensioning wheel sets (5 and 7), a winnowing pan chain (8), a transmission device (11) and the other components. The non-breaking corn hoister is a novel hoister adopting the low-rotating-speed and dump type discharging technology, and has the advantages of being free of leakage, back flowing and breaking.

The invention discloses a front-mounted blowing structure bunching component. The front-mounted blowing structure bunching component comprises a bunching body, a strip guide tube, a strip guide tube joint and a lower supporting plate, the bunching body is a flat bulk member, a conical groove with a rightward large end is arranged on the lower right portion of the bunching body which is longitudinally and flatly arranged, a right end of the strip guide tube is connected with a straight hole of the bunching body in a sealing mode, a tube opening at a left end of the strip guide tube is leftwards and downwards bent, the strip guide tube joint is sleeved on the tube opening at the left end of the strip guide tube, and an air inlet hole is mounted on the upper end face of the bunching body. The front-mounted blowing structure bunching component is characterized in that an inclined hole which is communicated with an inner hole of the strip guide tube joint is arranged on the right end face of the strip guide tube joint, a blowing tube is mounted, a right end of the blowing tube is connected with the air inlet hole on the bunching body in the sealing mode, and a left end of the blowing tube is connected with the inclined hole on the right end face of the strip guide tube joint in the sealing mode. According to the front-mounted blowing structure bunching component, a blowing structure is front-mounted, large negative pressure is generated in the inner hole of the strip guide tube to form a large attraction force, hitching and blocking phenomena at a hole opening at the right end of the straight hole of the bunching body connected with the strip guide tube can be prevented, cotton-fleece retracting and bunching time is short, and cotton-fleece retracting and bunching efficiencies are high.

The invention discloses a quick-release water dropper device for dropping a soft capsule machine. The quick-release water dropper device comprises a fixing plate, a barrel connector, a pump body coupling head connected with a pump, a barrel and a drip nozzle, wherein the fixing plate is arranged on the barrel connector; the barrel connector is in threaded connection with the pump body coupling head; the pump body coupling head is provided with a glue liquor passage; the barrel is in threaded connection with the barrel connector and a straight slot communicated with the glue liquor passage of the pump body coupling head is formed; and the drip nozzle is arranged at the lower end of the barrel. The quick-release water dropper device is convenient and rapid in disassembly, and the production efficiency is improved.

The invention relates to the field of traditional Chinese medicine preparation, discloses an intelligent hydrogel for preventing and treating cervical diseases, and also discloses a preparation methodthereof. The intelligent hydrogel is prepared from block copolymer of polyoxyethylene polyoxypropylene ether, polyglutamic acid, hyaluronic acid, yeast dextran, glycyrrhizin organic polymer, compoundzedoary turmeric oil, fructus cnidii, radix sophorae flavescentis, water-soluble alpha-bisabolol, phellodendron, borneol, dandelion, anthocyanidin and so on. In a fluid state when injected into the body, After entering the body, it quickly distributes to the surface of the cervix and the bottom of the vagina, effectively covers the wound surface, and then the hydrogel is heat exchanged with the human body in the body to form a stable gel, and a gel layer with a spatial network structure is formed on the surface of the whole cervix and the bottom of the vagina, so that the drug ingredients inthe hydrogel can play a lasting role. The hydrogel can promote the convergence of cervical wound erosion surface, remove odor, reduce seepage fluid and blood, improve erosion, alleviate leucorrhea, and restore normal vaginal environment.

A protective airbag with a rapid gas generating device comprises an airbag (1) and the rapid gas generating device (2) connected with the airbag; the airbag (1) comprises a main protection area (3) with a liquid inlet (12) and a gas pressure buffer area (4), wherein the main protection area (3) and the gas pressure buffer area (4) are partitioned by a partition layer (5); sodium bicarbonate powder is arranged in the main protection area (3), a gas port (6) is formed in the partition layer; the rapid gas generating device (2) is connected out of a gas inlet; the rapid gas generating device (2) comprises a shell (7), a propeller (8) driven by a motor and disposed in the middle of the shell, a conical bottom cavity (9) located below the propeller, and a liquid storage bag (10) connected to the conical bottom cavity; the liquid storage bag (10) is filled with aluminum sulfate solution, a one-way valve type liquid outlet (11) is arranged on the bottom end of the conical bottom cavity, and the liquid outlet (11) is connected with the liquid inlet (12) of the airbag. The protective airbag can generate gas automatically, has good tightness, safety, portability and high applicability, and is easy to wear.

The invention discloses a disposal medical negative pressure gas joint backflow prevention device which comprises a negative pressure gas joint (4), a liquid collecting bottle (9) and a backflow prevention device (6), wherein the outlet end and the inlet end of the backflow prevention device are respectively connected and conducted with the negative pressure gas joint and the liquid collecting bottle; the backflow prevention device further comprises a hollow integrated outer casing (1) with an inlet joint integrated structure, an outlet joint (3) with an opened inlet end part inner cavity concave platform structure and a sealing filter element (2) for embedding and connecting the inlet end part notch of the outlet joint and sealing pores; and the sealing filter element is a honeycomb pinhole structure with a built-in center concave hole structure, and the shape of the center concave hole is matched with that of the filter element body. The disposal medical negative pressure gas joint backflow prevention device disclosed by the invention has the characteristics of simple structure, convenience for assembly, capability of quickly sealing and blocking and the like, and can satisfy the requirements of backflow prevention control of the negative pressure gas joint.

The patent of the present invention provides a variable displacement swash plate compressor, which includes a cylinder body connected with a back cover through a valve plate assembly, and a suction chamber and an exhaust chamber are arranged in the middle of the back cover. There is a circular partition rib in the middle of the air chamber and the exhaust chamber, a sound-absorbing cavity is provided in the middle of the exhaust chamber, and a one-way valve is provided between the circular partition rib and the sound-absorbing chamber; the suction of the cylinder body The end surface of the bottom of the mouth is a drag reducing surface arranged obliquely. A muffler cavity and a one-way valve are set in the exhaust chamber of the rear cover, so that when the high-pressure air flows through the inner and outer sides of the rear cover, the flow of the gas is more stable, and the backflow phenomenon will not be caused, reducing the noise of the air flow; The bottom end surface of the suction port is provided with an inclined drag-reducing surface. When the gas enters the suction port, it passes through the drag-reducing surface to make the airflow in different directions tend to be consistent, guide the airflow in a direction, reduce the resistance of the airflow, and thereby reduce the Reduce power consumption and improve the energy efficiency of the compressor.

The invention discloses a waste dry battery pretreatment and recovery process and a recovery treatment device, and belongs to the field of resource recycling. According to the present invention, through a waste battery recovery process, the electrolyte and a metal shell are firstly separated from each other, then the electrolyte flows out, and after a waste battery is disassembled, the metal shellis recycled, and the electrolyte flushes out and is uniformly mixed, the two above steps can be carried out at the same time, and the waste battery recycling step has coherence. Compared with the phenomenon in the prior art that part of electrolyte cannot be completely recycled, according to the present invention, the electrolyte can be fully flushed out and intensively mixed through a high-pressure water pipe, so that the metal recovery rate of the waste batteries is increased. Meanwhile, the device used in the process can dissipate heat generated instantaneously in the waste battery recovery process in time, so that the safety of waste battery pretreatment is improved.

The invention discloses a methanol-high-pressure-oxygen compound two-stroke engine. The methanol-high-pressure-oxygen compound two-stroke engine is composed of one or more air cylinder groups, each air cylinder group comprises a main air cylinder and a corresponding auxiliary air cylinder, and the main air cylinders are provided with starting fuel nozzles, methanol nozzles, oxygen nozzles and mainair cylinder exhaust valves and are not provided with air inlet valves; and connection channels are arranged between main air cylinder exhaust ports and the auxiliary air cylinders, the connection channels are provided with one-way valves at auxiliary air cylinder inlets, air in the main air cylinders only flows into the auxiliary air cylinders through the one-way valves, the auxiliary air cylinders are not provided with fuel nozzles and are provided with auxiliary air cylinder air inlet valves and auxiliary air cylinder exhaust valves, and the auxiliary air cylinder air inlet valves communicate with an engine air inlet pipe. Methanol is injected into the main air cylinders, the amount of oxygen injected in the main air cylinders is controlled, the degree of fuel combustion is controlled,high-temperature active air which is not completely burned in the main air cylinders is introduced into the auxiliary air cylinders to continue combustion, the cylinder-dividing circulation is achieved, the emission of harmful air is reduced, and the full combustion of fuel is achieved.

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 discloses an analyzing and metering device and a liquid analysis system, relating to the technical field of fluid analysis and aiming to solve the problem of inaccuracy in liquid metering and achieve accuracy in metering of liquids in different volumes, thus improving the measurement accuracy of the liquid analysis system. The analyzing and metering device mainly comprises a first control valve, a reaction analysis device, a metering tube and a fluid driver, wherein the first control valve comprises a public port and a plurality of distribution ports which can be alternatively communicated with the public port; the plurality of distribution ports include at least one blind hole port and an air port communicated with the atmosphere; the reaction analysis device is provided with a first channel opening and a second channel opening; the metering tube is connected between the public port and the first channel opening; a first connecting tube orifice is formed in the wall of the metering tube and is connected with a first waste liquid tube by a second control valve; the inner diameter of the metering tube is less than 4mm; the fluid driver is connected with the reaction analysis device. The analyzing and metering device is mainly used in the technical field of chemical analysis instruments.

The invention relates to the technical field of copper rod machining and aims to provide a copper rod machining line and a copper rod machining process which are convenient for feeding copper blocks, free of copper fluid backflow, good in compactness of a produced copper rod, lower in surface defection ratio, low in energy consumption and packing cost and not prone to produce oxidation on the surface of the copper rod. The copper rod machining line comprises a copper melting furnace and a continuous casting machine. The copper melting furnace comprises a vertical combustion furnace, the upper end of the combustion furnace is provided with a fuel inlet and a copper block feeding port, and the lower end of the combustion furnace is provided with a copper liquid outlet. A casting outlet and a cavity of the continuous casting machine are rectangular, a heat preserving furnace is arranged between the copper liquid outlet and the inlet of the continuous casting machine, and an edge mark shearing machine, an edge milling machine and a rolling machine are docked with a casting outlet of the continuous casting machine in sequence. By the application of the copper rod machining line and the copper rod machining process, the problems of inconvenience in feeding of the copper block and unsmooth in melting, high energy consumption and packing cost, proneness to oxidation on the surface of the copper surface, high surface defection ratio and poor compactness of the copper rod existing in an existing copper rod machining method are solved.

The invention belongs to a production method of a fireproofing flue of an environmental-friendly building and an exhaust duct in a washroom. The method comprises the steps of bittern making, mixed pulping, forming, maintaining and the like of raw materials comprising magnesium oxide, magnesium chloride, fibrous fragments and accessories. The fireproof plate, a kitchen flue and the exhaust duct in the washroom of the environmental-friendly building have the advantages of high mechanical strength, incombustibility, energy conservation and environmental friendliness. Tested by the national quality surveillance examination test center for building material and industrial housing building material, the environmental-friendly building fireproof plate, the kitchen flue and the exhaust duct reaches the quality and technical index stated by the nation in the aspects of mechanical strength, fireproofness, hydrolytic resistance, formaldehyde release limit and the like. The on-site analog experiment is carried out on the kitchen flue and the exhaust duct in the washroom by the national surveillance examination test center for air-conditioning equipment, and flues at 36-story floor height are tested, reach the quality and technical index stated by the nation, and have the performances of environmental friendliness, fireproofness, corrosion resistance and the like as compared with the cement chimney, and avoids the backward flow phenomenon in air draft.

The invention relates to an improved evaporative cooling tower which comprises a cooling tower main body, and is characterized in that a water inlet is arranged at one side of the top of the cooling tower main body, a water outlet is arranged at the other side of the top of the cooling tower main body, the water inlet and the water outlet are communicated with each other through a pipeline, a spray distribution system is arranged on the pipeline and comprises a plurality of nozzles and an evaporative coil, the evaporative coil is positioned below the nozzles, a water collection device is arranged at the lower part of the spray distribution system and comprises a water collection tank and a floating ball, the floating ball is arranged in the water collection tank, a filter device is also arranged at the water inlet, and a control device is arranged at the water outlet. The improved evaporative cooling tower has the advantages that the improved evaporative cooling tower has a simple structure, air in the cooling tower cannot generate a backflow phenomenon, so the cooling effect is good; no blocking phenomenon can be generated during the working process of the cooling tower, so the improved evaporative cooling tower has a good operation effect, saves energy, is low in use cost, and brings convenience to daily production and life.

The invention relates to the technical field of medical treatment, in particular to an effusion discharging device for oncology department nursing. The effusion discharging device comprises a sleeve,a piston, a needle head, a first connecting rod and a pull ring, wherein an anti-infection assembly is arranged on the lower surface of the sleeve, and a convenient-to-replace assembly is arranged onthe lower surface of the anti-infection assembly; and the convenient-to-replace assembly comprises a lantern ring, connecting grooves are formed in the inner wall of the lantern ring, grooved rails are arranged on the inner wall of the lantern ring, each connecting groove communicates with the corresponding grooved rail, a communicating rod is arranged on the inner wall of the lantern ring, connecting plates are arranged on the upper surface of the communicating rod, a second connecting rod is arranged on the outer surface of each connecting plate, a circular ring is arranged on the outer surface of each second connecting rod, and a spring is arranged on the outer surface of each connecting plate. The anti-infection assembly is newly arranged, so that the device is good in stability and cannot cause the backflow phenomenon; and in addition, more effusion is collected by the effusion discharging device, and a collecting device can be replaced in time, so that infection caused by woundsof patients is avoided.