79results about How to "Increase negative pressure" patented technology

The invention discloses an anti-hair-loss medicine applying device capable of quantitatively controlling medicine output and a quantitative control method, and relates to the technical field of hair care. The liquid storage module is arranged at one end of the cylindrical shell and used for providing liquid medicine; the liquid guide module is arranged at the other end of the cylindrical shell and is used for dispersing the liquid medicine onto the scalp; the quantifying module is arranged in the cylindrical shell, the input end of the quantifying module is connected with the liquid storage module, the output end of the quantifying module is connected with the liquid guide module, and the quantifying module is used for conveying the liquid medicine to the liquid guide module according to the set volume; the battery and control module is arranged in the cylindrical shell and used for providing power and controlling the quantitative module to operate, the battery and control module is provided with an input panel, and the input panel extends to the outer side of the cylindrical shell. The liquid medicine can be smeared on the hair roots and the scalp in a mechanical mode, then the hand can be prevented from being greasy, and the use experience is greatly improved.

The invention relates to the technical field of sodium glucoheptonate production, in particular to a sodium glucoheptonate content detection and extraction device and a detection method.The sodium glucoheptonate content detection and extraction device comprises a detection and extraction table, a transmission motor is installed on the outer wall of the detection and extraction table, and the output end of the transmission motor is fixedly connected with a second transverse shaft; a first gear and a second gear are fixedly connected to the outer wall of the second transverse shaft, a first rotating disc is rotationally arranged on the outer wall of the detection and extraction table, and the first rotating disc is used for placing an extraction detection vessel. According to the sodium glucoheptonate content detection and extraction device, in the following movement process of the sampling barrel, the space between the piston and the lower end of the sampling barrel is gradually increased, at the moment, the negative pressure in the space is also increased, an adsorption effect is generated in an extraction pipe through a water outlet hole, and a solution in a sample vessel is adsorbed through an opening in the lower end; and a solution is pumped into the pumping pipe and enters a space between the piston and the lower end of the sampling barrel through the water outlet hole to be stored.

The utility model discloses a temperature monitoring device for coal mine electromechanical equipment, and relates to the technical field of coal mine electromechanical equipment temperature monitoring, the temperature monitoring device comprises an electromechanical body, a mounting mechanism and a detection mechanism, the mounting mechanism comprises a sleeve shell and a connecting rod, the lower surface of the sleeve shell is fixedly connected with a suction cup, and the suction cup is fixedly connected with the connecting rod. A through hole is formed in the inner bottom wall of the sleeve shell, an inner threaded pipe is embedded in the upper surface of the sleeve shell, a threaded part in threaded connection with the inner threaded pipe is arranged on the surface of the connecting rod, and one end of the connecting rod is rotationally connected with a piston in close fit with the inner wall of the sleeve shell. According to the utility model, the sucking disc is sucked on a corresponding position on the surface of the electromechanical body, then the connecting rod is rotated, the connecting rod can be rotated through the handle or through a wrench and an electric wrench via a hexagonal groove, and through the cooperation of the thread part and the internal thread pipe, the piston is driven to move upwards, so that the negative pressure in the sleeve shell is enhanced, and the equipment is not easy to fall off; the installation is convenient.

The invention relates to the technical field of surgical aspirators, and discloses a neurosurgical aspirator which comprises an aspiration body and further comprises a shell, the aspiration body is arranged in the shell, a positioning assembly is arranged between the aspiration body and the shell, a plurality of sliding grooves are formed in the shell in a penetrating mode, and the positioning assembly comprises a positioning ring, a locking ring, a connecting ring and a plurality of connecting rods. The connecting rods are arranged in the sliding grooves respectively, the locking ring is in threaded connection with the outer wall of the shell, the positioning ring is arranged at the ends, close to the locking ring, of the connecting rods, the connecting ring is arranged at the ends, away from the locking ring, of the connecting rods, and the attraction body is located in the connecting ring. By forming the sliding groove in the shell, the connecting rod is slidably installed in the sliding groove, the position of the connecting rod in the sliding groove is adjusted through the connecting ring, then the length of the positioning ring and the length of the suction body are controlled, a doctor can suck wounds with different depths conveniently, and meanwhile the positioning ring is matched to prevent the suction body from making direct contact with nervous tissue; and secondary injury in the operation process is prevented.

The negative pressure drainage device comprises an air pressure balloon, a drainage tube and a drainage needle, the air pressure balloon is connected with the drainage needle through the drainage tube, a tip is arranged at the end of the drainage needle, a drainage hole is formed in the tip of the drainage needle, an air bag is arranged on the outer side of the drainage needle, the air bag is communicated with the drainage needle through an air valve, and a center ball is arranged in the middle in the drainage needle. The outer side of the central ball is connected with a side ball through a flexible wire; a drainage bottle is arranged on the rear side of the air pressure balloon; by means of the air bag, the air pressure balloon is pinched, air in the air pressure balloon enters the drainage needle and enters the air bag, the problem that the air in the drainage needle flows out of the drainage hole, and consequently a surgical wound bulges is solved or reduced, and exudate can be discharged easily; in addition, the air bag plays a blocking role, flowing of the percolate to other positions is reduced, flowing of the percolate to the drainage hole is facilitated, and therefore the percolate is conveniently led out. In addition, the air bag presses the wound surface, so that exudation of exudate of an operation part is reduced.

The utility model discloses a double-injection urea pump and an injection system, and relates to the technical field of engine tail gas treatment. Comprising a pump body; the pump body is provided with a liquid suction cavity, a liquid inlet cavity and a liquid discharge cavity; a diaphragm is arranged in the liquid suction cavity; a first sealing structure is arranged between the liquid suction cavity and the liquid inlet cavity, and a second sealing structure is arranged between the liquid suction cavity and the liquid discharge cavity; the first sealing structure is configured to be opened so that urea can enter the liquid suction cavity through the liquid inlet cavity when the diaphragm deviates from the liquid suction cavity and negative pressure is formed in the diaphragm. The second sealing structure is configured to be opened when the diaphragm compresses the liquid suction cavity to form positive pressure in the liquid suction cavity, so that urea is discharged out of the liquid suction cavity through the liquid discharge cavity; only the diaphragm is arranged in the liquid suction cavity in the pump body, and structures such as a valve element and a valve plate are not arranged, so that the structure is simplified, the internal volume of the liquid suction cavity is increased, and the double-spray flow of urea is improved.

The invention provides a non-flat-layer arrangement flow battery and a control method and device thereof. The flow battery comprises a positive storage tank, a positive pump, a positive liquid supply pipe, an electric pile and a positive liquid return pipe which are communicated in sequence, the positive buffer tank is communicated to the positive liquid return pipe through a first liquid phase branch and is communicated to the upper gas space of the positive storage tank through a first gas phase branch, and a positive liquid level sensor is arranged on the positive buffer tank; the negative electrode storage tank, the negative electrode pump, the negative electrode liquid supply pipe, the electric pile and the negative electrode liquid return pipe are sequentially communicated, the negative electrode buffer tank is communicated to the negative electrode liquid return pipe through a second liquid phase branch and is communicated to the upper gas space of the negative electrode storage tank through a second gas phase branch, and a negative electrode liquid level sensor is arranged on the negative electrode buffer tank. The negative pressure of the galvanic pile is avoided, the safety of the redox flow battery is protected, and the stable operation of the redox flow battery is facilitated.

The utility model provides a device capable of inhibiting the generation of unloading dust, which comprises a mounting seat mounted below a warehouse and further comprises a mounting seat inner pipe arranged in the mounting seat, and a mounting seat outer pipe arranged in the mounting seat, the mounting seat outer pipe is arranged outside the mounting seat inner pipe in a sleeving manner; the dust channel is arranged between the mounting seat inner pipe and the mounting seat outer pipe; the dust suction pipe is arranged on the side wall of the mounting base outer pipe, communicates with the dust channel and is used for being externally connected with a dust suction device; the material pipe is mounted at the bottom end of the mounting seat, and the material pipe further comprises a material inner pipe mounted at the bottom end of the mounting seat inner pipe; the material outer pipe is mounted at the bottom end of the mounting seat outer pipe, and the length of the material outer pipe is larger than that of the material inner pipe. The double-layer material pipe composed of the material inner pipe and the material outer pipe is adopted, descending material flow and ascending dust-containing airflow are separated, the double-layer channel is adopted, the negative pressure is larger, the sealing performance is better, and dust does not leak out.

The utility model relates to the field of construction safety, concretely relates to a kind of for safety belt collocation multi-point adsorption type safety fixing device, including main frame, sucking disc, pressure outlet, pressure ware, power, connecting buckle, connecting rope, hook, alarm, the sucking disc evenly distributes in the bottom of the main frame, the pressure outlet is set in the side of one vertex of the main frame, the connecting buckle is set in the front of the main frame, the connecting rope connects the connecting buckle and hook, the pressure ware is set in the main frame and is connected with the sucking disc, the power is electrically connected with the alarm, pressure ware, after sucking disc and adsorption operating surface contact, the pressure ware empties the gas in the sucking disc by the pressure outlet. The adsorption, illuminating property, convenience, safety of the device provide better security guarantee for the safety of worker in construction site, more convenient in construction process, improve the safety index of construction site.

The application discloses an air passage structure and an electronic atomizer. The air passage structure comprises a plate body, a communication hole, a communication channel, a first air outlet and a second air outlet. The plate body comprises a first plate surface and a second plate surface facing away from each other. The communication hole, the first air outlet and the second air outlet are respectively arranged in the plate body and penetrate through the first plate surface and the second plate surface. The communication hole is used for communicating with the outside atmosphere. The communication channel is formed in the first plate surface and / or the second plate surface. The first air outlet is used for communicating with a suction nozzle of the atomizer. The communication hole, the communication channel and the first air outlet are sequentially connected to form a first air passage capable of connecting and awakening a sensing component of the atomizer. The second air outlet is used for communicating with a mist suction channel of the atomizer and the outside atmosphere. The second air outlet is connected to the first air outlet. The air passage structure can improve the sensitivity of awakening the sensing component to start.

The utility model discloses dust removal equipment for coating production, which belongs to the technical field of coatings and comprises a box body, a filter screen is fixedly connected to the inner wall of the box body, a fan is fixedly connected to the right side surface of the box body, the input end of the fan is fixedly communicated with a suction pipe, and one end, far away from the fan, of the suction pipe is fixedly communicated with the upper surface of the box body. And the back surface of the box body fixedly communicates with a connecting pipe. According to the dust removal equipment for coating production, by arranging a fan, a suction pipe, a connecting pipe, a water pipe, a filter screen, a pump body and a spray head, negative pressure is conveniently generated in the box body through cooperation of the suction pipe and the fan, dust conveniently enters the box body through the connecting pipe, and then according to the connection relation between the water pump and the water pipe, the spray head conveniently sprays water to the dust in the box body; and the filter screen is used for conveniently filtering gas in the box body, so that dust can be conveniently filtered through cooperative use, and pollution to the surrounding environment can be reduced.

The utility model relates to the technical field of oil tank lock covers, and discloses an oil tank lock cover, an oil tank and an operation machine. The oil tank lock cover comprises a lock cover body, the mounting base is connected with the interior of the lock cover body in a matched mode, and a mounting through hole is formed in the mounting base; the valve nail is movably mounted in the mounting through hole and has an opening state and a sealing state, and in the opening state, a gap is reserved between the valve nail and the mounting through hole, and an air inlet channel is formed between the mounting seat and the lock cover body; in a sealing state, the valve nail blocks the mounting through hole, and an exhaust channel is formed between the mounting base and the lock cover body. The air inlet channel and the exhaust channel are arranged between the mounting seat and the lock cover body, so that the air pressure in the oil tank can be effectively adjusted, and the conditions that the oil tank is shrunken and deformed due to suction and fuel oil leaks are avoided.

The present invention relates to the technical field of burners, and in particular to a self-sustaining stable combustion burner with an improved inner cavity structure, comprising: a combustion tube, whose outlet end is a flame outlet, and whose inlet end is connected to a plasma generator and a powder inlet; an outer tube, which is sleeved between the outside of the combustion tube and the combustion tube to form a closed return air chamber; the inner cavity structure of the combustion tube is a combustion chamber formed by a reducing neck portion at the inlet end being sequentially connected to a reducing guide portion, a middle cylinder portion, a tempering reducing connection portion, and an outlet end, a tempering guide portion extending along an axial direction is arranged near the top of the inner cavity of the middle cylinder portion, and the combustion tube is provided with a return air duct for connecting the return air chamber and the combustion chamber, the return air duct is located on the tempering reducing connection portion and is located near the top of the middle cylinder portion, and is used to solve the technical problems in the prior art that the continuous operation of the burner needs to rely on a plasma igniter, resulting in low combustion efficiency and easy coking and difficult cleaning of the inner cavity of the combustion chamber.

The invention relates to a kind of emulsion extrusion equipment, including milking barrel, the head of the milking barrel is movably inserted with replaceable milking sleeve, the tail of the milking barrel is connected with horn barrel, the lower end of the horn barrel is connected with connecting pipeline, and the connecting pipeline is connected to the collecting barrel.By the structure of annular air bag, air pipe, adjusting cavity, elastic pull rope and elastic cylinder, when vacuum machine stops working or fails, the negative pressure in the elastic cylinder channel reduces, the adjusting cavity is dragged by elastic pull rope and is extruded to make gas enter annular air bag, so that annular air bag is inflated to strengthen the extrusion of elastic extrusion cylinder and isolation cylinder, can continuously clamp nipple and not fall, avoid negative pressure stop extrusion equipment from falling and cause pollution.

The invention relates to the technical field of carbon nano paper preparation, and provides continuous carbon nano paper preparation equipment which comprises a support, a filter membrane, an unwinding device and a winding device and further comprises a supporting piece, the supporting piece comprises two side plates, the two side plates are each provided with a suction filtration pipe, and the suction filtration pipes are used for being connected with a vacuum pump; a negative pressure cavity is formed in the annular multi-cavity rotary negative pressure roller, a radial micropore is formed between the outer circumferential surface and the negative pressure cavity, and a through hole is formed in the end surface and is communicated with the corresponding negative pressure cavity; the two negative-pressure sealing fixed rollers are in contact with the two ends of the annular multi-cavity rotating negative-pressure roller, arc-shaped negative-pressure grooves are formed in the negative-pressure sealing fixed rollers, first suction filtration holes and second suction filtration holes which are communicated with the arc-shaped negative-pressure grooves are formed in the two end faces of the negative-pressure sealing fixed rollers, and the diameters of the second suction filtration holes are gradually increased in the rotating direction of the annular multi-cavity rotating negative-pressure roller; and the arc-shaped liquid supply groove is arranged on the annular multi-cavity rotary negative pressure roller in a sleeving manner. The continuous preparation of the carbon nano paper can be realized, so that the preparation efficiency of the carbon nano paper is effectively improved.

The utility model provides a range hood which comprises a fan, an exhaust fume collecting hood with a bottom inlet and a fan frame, the fan is fixed on the fan frame and communicated with the bottom inlet, the forward side of the fan frame comprises a front cover plate, a ventilation opening is arranged on the front cover plate, an air inlet of the fan is positioned on the forward side, and the air inlet of the fan is communicated with the ventilation opening. The inner side of the front cover plate is connected with an adsorption module used for adsorbing volatile organic compounds, an adsorption inlet of the adsorption module is exposed out of the ventilation opening, the height of the adsorption module is larger than that of the center line of the air inlet, and a closed inner space is formed in the fan frame to communicate with the bottom inlet and an adsorption outlet of the adsorption module. According to the utility model, on one hand, pollutants are adsorbed, so that air flow purification is realized, treatment of pollutants such as VOCs in a kitchen is realized, and the problems of peculiar smell in the kitchen and the like are solved; and on the other hand, the negative pressure of a local area is improved, the problem that the flow speed of the whole area of the air inlet of the fan is uneven due to size reduction of the fan frame is solved, air volume is increased, and rotating speed and noise are reduced.

The utility model relates to an anti-abrupt change circuit, in particular to an anti-abrupt change circuit for reading a pressure sensor value by a module, which comprises a pressure sensor and an MCU (Microprogrammed Control Unit) chip for reading an AD (Analog to Digital) value of the pressure sensor, a resistor R1 and a resistor R2 are also arranged; the resistor R1 and the resistor R2 form a voltage division circuit to reduce the voltage output by the pressure sensor; a current-limiting resistor R3 is connected in series before being connected to an AD detection pin of the chip; a capacitor C1 and a capacitor C2 are arranged; two diodes D1 are arranged between the current limiting resistor R3 and the MCU chip; the problem of power supply of the MCU chip can be solved, and an anti-abrupt change function is realized.

The utility model relates to the technical field of natural rubber processing, in particular to a rubber particle vacuum dehydration device for rubber production. A dewatering filter screen is arranged on the dewatering filter screen rotating roller; the dewatering filter screen is annularly and rotationally arranged on the dewatering filter screen rotating roller, the dewatering filter screen supporting wheel and the dewatering filter screen guide wheel; the left end of the dewatering filter screen is connected with a rubber particle feeding conveyor belt; a rubber particle discharging conveyor belt is arranged at the lower part of the right end of the dewatering filter screen; a plurality of filter screen negative pressure base plates are supported at the bottom of the dehydration filter screen; a negative-pressure opening is formed in the surface of the filter screen negative-pressure base plate; the bottom of the negative-pressure opening is connected with a negative-pressure cavity; the bottom of the negative-pressure cavity is connected with a negative-pressure drainage pipe; the other end of the negative-pressure drainage pipe is connected with a negative-pressure vacuum pump A water collecting tank is arranged at the bottom of the rubber dewatering frame; according to the natural rubber block dewatering and air drying device, the problem of rapid dewatering and air drying of natural rubber blocks is solved.

The invention relates to the technical field of liquid level control, and discloses a liquid level control system, method, device and equipment for a resin tank of a 3D printer, and the system comprises liquid level detection equipment which is used for detecting the real-time liquid level height; the cavity is immersed into the resin in the resin tank by a preset depth; the vacuum pump is opened or closed according to the pressure reduction instruction of the controller to adjust the internal pressure of the cavity; the pressure relief equipment is used for opening or closing according to the pressure boosting instruction of the controller to adjust the internal pressure of the cavity; and the controller is used for comparing the real-time liquid level height with the target liquid level height, controlling the vacuum pump or the pressure relief equipment to be opened and closed according to a comparison result, and adjusting the internal pressure of the cavity so as to control the liquid level height. The negative pressure adsorption principle is utilized, the pressure in the cavity is controlled through the vacuum pump and the pressure release valve, the liquid level in the resin tank is adjusted, the control cost of the system is reduced, and the control precision of the liquid level in the resin tank is improved.

The present invention discloses a hair loss prevention medicine applicator with quantitative control of medicine dispensing and a quantitative control method, which relates to the field of hair care technology, and comprises a cylindrical shell; a liquid storage module, which is arranged at one end of the cylindrical shell and is used to provide medicine liquid; a liquid guide module, which is arranged at the other end of the cylindrical shell and is used to disperse the medicine liquid to the scalp; a quantitative module, which is arranged inside the cylindrical shell, and the input end of the quantitative module is connected to the liquid storage module, and the output end of the quantitative module is connected to the liquid guide module, which is used to transport the medicine liquid to the liquid guide module with a set capacity; a battery and control module, which is arranged inside the cylindrical shell and is used to provide power and control the operation of the quantitative module, and the battery and control module have an input panel, and the input panel extends to the outside of the cylindrical shell. The present invention can apply the medicine liquid to the roots of the hair and the scalp in a mechanical way, thereby avoiding greasy hands and greatly improving the user experience.

This invention relates to an anti-cavitation device and method for fluid pipelines. The invention includes a fluid pipeline with a bend; a guide vane assembly disposed within the bend to guide the fluid flow at the bend; wherein the guide vane assembly includes a guide vane body, the guide vane body including guide vanes extending towards the outlet of the bend, the guide vanes being circumferentially arranged around the axis of the guide vane body, so that the fluid forms a controlled pre-swirling flow field before entering the bend outlet. This invention, by installing a guide vane-type device at the bend of the fluid system pipeline, changes the flow direction of the liquid, avoids abrupt changes in liquid velocity at the bend, eliminates boundary layer diversion, increases the absolute pressure inside the bend, and thus improves the cavitation resistance of the entire pipeline system.

The invention belongs to the technical field of heating smoking sets, and particularly relates to a smoking set capable of regulating and controlling negative pressure in the smoking process and application, the smoking set comprises a main body, and the main body is internally provided with a heating cavity and an air inlet channel which are communicated with each other; the heating mechanism is used for heating the fuming substrate and is arranged in the heating cavity; and the plugging mechanism is mounted on the main body and is used for plugging the air inlet channel at the rear half section of the suction action. According to the purpose, the air inlet channel is blocked at the rear half section of single-mouth suction through the blocking mechanism, so that the negative pressure of the environment where a fuming substrate is located is increased by utilizing the continuous suction action of a user, more fuming agents in the fuming substrate are separated out, aerosol is promoted to be generated and released, and therefore the smoke can be effectively prevented from being generated in the next-mouth suction process. Therefore, the utilization rate of the fuming substrate is improved, and the problem of insufficient later-stage fuming amount is avoided.

The invention discloses a siphoning type closestool and a flushing method thereof, the siphoning type closestool comprises a closestool body, the closestool body is provided with a urinal and a siphoning pipeline, the top of the urinal is provided with a brush ring structure, and the brush ring structure is controlled by a water outlet control mechanism to discharge water or not; the siphon pipeline comprises a sewage inlet, an ascending pipe section, a descending pipe section and a sewage outlet which are sequentially communicated in the sewage discharging direction, and the sewage inlet is communicated with the bottom of the urinal; the siphon pipeline is provided with an exhaust hole, the exhaust hole is located at the joint of the ascending pipe section and the descending pipe section, and the exhaust hole is provided with an exhaust one-way valve; a switch assembly is arranged at the drain outlet, when the switch assembly is in a closed state, the siphon pipeline at least enables the downcomer section to be in a full-pipe state full of water by supplementing water, and in the water supplementing process of the siphon pipeline, air in the siphon pipeline is exhausted through the exhaust one-way valve. Passive siphoning is changed into active siphoning, and air noise generated by high-speed water flow for spraying siphoning is avoided, so that the flushing noise of the whole closestool is reduced, and the defecation comfort is improved.

This utility model discloses a conveying mechanism for a deburring and wire drawing machine, relating to the technical field of conveying equipment for deburring machines. The conveying mechanism includes a conveying platform, with a material feeding rack at one end for placing and conveying materials. A conveying device for moving the materials is installed on the conveying platform. The conveying device is connected to a power device for providing a power source, which is connected to the conveying platform. A support mounting plate is provided on one side of the conveying platform, and a connecting bracket for connecting the lifting device in the deburring machine is fixedly installed on the support mounting plate. Air intakes are provided on both sides of the conveying platform, and the two air intakes are interconnected, forming a negative pressure air duct. Negative pressure is transmitted to the surface of the conveyor belt through six independent spaces on the platform and small holes on the surface of the conveyor belt. The negative pressure suctions the workpiece being processed, achieving greater suction in localized areas with the same power negative pressure fan through regional adsorption, allowing for the adsorption of smaller workpieces to be ground.

This invention discloses a dust-proof wall sander, comprising: a mounting plate; an electric sanding disc connected to the front of the mounting plate, with a gap between the mounting plate and the sanding disc; a sanding hood surrounding the gap between the mounting plate and the sanding disc, forming a cavity; a negative pressure pipe connected to the back of the mounting plate, one end of the negative pressure pipe communicating with the cavity, and the other end connected to an external negative pressure pump; and a suction assembly for attracting sanding dust, the suction assembly including multiple suction tubes laid outside the sanding hood, the first ends of the multiple suction tubes being distributed around the outer periphery of the sanding hood, and the second ends of the multiple suction tubes communicating with an annular manifold, the annular manifold being connected to the negative pressure pipe via a connecting pipe. This invention avoids dust generation and meets the requirements of green construction.

The vacuumizing system comprises a plurality of first vacuum pumps which are arranged in parallel, the air inlet ends of the first vacuum pumps are respectively communicated with a vacuum cavity, the first vacuum pumps are further connected with a second vacuum pump in series, and the air outlet ends of the first vacuum pumps are respectively communicated with the air inlet end of the second vacuum pump. The air outlet end of the second vacuum pump is connected with a noise reduction assembly. According to the utility model, the plurality of first vacuum pumps are connected in parallel and then connected in series with the second vacuum pump, the plurality of first vacuum pumps connected in parallel increase the air exhaust flow, output air is collected to the second vacuum pump and sucked by the second vacuum pump, so that the negative pressure of air flow can be further improved; and meanwhile, fluctuating and loud-noise airflow blown out by the first vacuum pumps is absorbed through the second vacuum pump, noise can be greatly reduced, noise reduction is conducted again through the noise reduction assembly, and therefore the effects of large negative pressure, large flow and low noise of the vacuum pumping system are achieved, and meanwhile the cost can be greatly reduced.

The utility model discloses a simple animal smoking model modeling device for experiment, which belongs to the technical field of smoke toxicity research, and comprises an air pump and a smoke box, the opening part of the smoke box is hinged with a first sealing door, the top of the smoke box is symmetrically provided with ventilation openings, and the first sealing door is hinged with a second sealing door. A smoke sealing box is fixedly connected to the side, away from the sucking pump, of the smoke burning box, a second sealing door is hinged to the opening portion of the smoke sealing box, an insertion hole connected with an inner cavity of the smoke burning box in a communicating mode is formed in the inner side of the smoke sealing box, and a smoke particle concentration detector and a fan are installed on the top wall of the inner cavity of the smoke burning box. A carbon tank and a water storage bottle are installed between the smoke burning box and the sucking pump, the simple healthy environment-friendly device is additionally arranged, the health of an experimenter is facilitated, environment smoke diffusion is relieved, and the box body continuously enters the fresh oxygen and simulates the animal smoking state by increasing the negative pressure in the simple smoke burning box.

The invention discloses a negative pressure suction type sewage treatment aeration oxygen dissolving device, and relates to the technical field of equipment for increasing the dissolved amount of oxygen in water in a rotary stirring mode. The device comprises an impeller, an impeller fairing and a driving motor, a first water inlet corresponding to the V-shaped drainage part in position is formed in the upper part of the impeller fairing; the impeller fairing is provided with an extended flow channel in the length extension direction of the inclined sheet extension part; the impeller fairing is provided with an annular air inlet chamber below the circular splitter plate; an annular air outlet window is arranged on the upper end surface of the annular air inlet chamber; an annular micropore air outlet plate is embedded in the annular air outlet window; a second water inlet is formed in the axis part of the annular air outlet window; the second water inlet is communicated with a lower water inlet pipe; the water inlet pipe penetrates through the annular air inlet chamber and is in sealed connection with the annular air inlet chamber; and the lower part of the annular air inlet chamber is communicated with an air inlet pipe. The water body area covered by the sprayed gas-liquid mixture is larger, and compared with an existing submersible aerator, the bubble volume is smaller, and the aeration efficiency is higher.

The invention discloses a slag removal robot in a gas furnace, which comprises a crawler, a crushing head, an adsorption cover, an inner pipeline, an outer pipeline, a cooling box and an air pump, the crushing head is arranged at the front end of the crawler, the adsorption cover is arranged at the bottom of the crawler, the adsorption cover comprises a lower cover body and an upper cover body, the lower cover body forms an adsorption cavity, and the upper cover body forms an adsorption cavity. An annular air outlet end is formed between the upper cover body and the lower cover body, the diameter of the upper cover body is smaller than that of the lower cover body, the adsorption cavity is communicated with the inner pipeline, the inner pipeline is arranged in the outer pipeline in a sleeved mode, the inner pipeline is communicated with the cooling box, the cooling box is connected with an air inlet of the air pump, and the air pump is connected with an air outlet of the air pump. An air outlet of the air pump is communicated with the outer pipeline, and the outer pipeline is communicated with the air outlet end. According to the slag removal robot in the gas furnace, the performance and the adsorption stability can be improved.