86results about How to "Improve negative pressure effect" patented technology

The invention discloses a biological safety centrifugal machine. The biological safety centrifugal machine comprises a box body, a box cover, a centrifugal device and a refrigerating device, wherein an air inlet is formed on the box cover; a filter is arranged in the air inlet; an air outlet is formed on the box body; a fan is arranged in the box body and is opposite to the air outlet; a filtering device is arranged in the box body; and the filtering device is arranged between the air inlet and the air outlet. The biological safety centrifugal machine can solve the problems that in the prior art, the centrifugal machine cannot ensure that the environment in a laboratory is not polluted and cannot ensure operators are not attacked by bacteria and virus fundamentally.

The invention discloses a conical cylinder type soil screening device for soil remediation. The conical cylinder type soil screening device comprises a support device, a driving device and a screeningbody, wherein the driving device is erected on the support device; the screening body comprises a screen mesh, a first side plate and a second side plate, the screen mesh is enclosed into a circulartruncated cone structure, the first side plate and the second side plate are respectively fixed to the large end surface and the small end surface of the circular truncated cone structure of the screen mesh, and the size of the first side plate is greater than that of the second side plate; and the driving device is used for driving a rotating shaft so as to drive the screening body to rotate around the axis. According to the conical cylinder type soil screening device for soil remediation, the automatic soil screening is realized, the feed and discharge are convenient, additionally, the accumulation of soil can be effectively avoided, and the soil screening efficiency is greatly improved.

Disclosed is a fluid mixer for mixing fluids of different types having a tube member in which a mixing portion for mixing the fluids of different types is installed and a nozzle member for introducing a fluid into the tube member. The nozzle member inn the fluid mixer includes a varying portion for varying a fluid flow.

The invention relates to a mechanical arm for transferring a solar cell piece basket and a double-head transfer device for transferring the solar cell piece basket. The double-head transfer device comprises mechanical arms, a portal frame, a vertical lifting mechanism fixedly arranged on the portal frame, and a lateral movement mechanism. Each mechanical arm comprises a vertically-arranged installing plate, a top plate fixedly arranged on the installing plate, an installing frame arranged on the top plate through a horizontal slide rail, a rotary table horizontally arranged on the bottom of the installing frame, a micromotion mechanism, a rotating mechanism arranged on the installing frame, and a vacuum system. A negative pressure sucker group adsorbs cell pieces by means of negative pressure provided by a vacuum generator. After the cells are adsorbed, the mechanical arms may start the rotating mechanism as required in a moved process in order to overturn a group of cell pieces by 180 degrees, thereby simplifying downstream work flows. Two baskets directly reach downstream equipment to be processed so that the downstream equipment configuration is simplified.

The invention discloses a squatting pan without a water tank, which comprises a squatting urinal, a water flushing part, a water delivery part and a negative pressure generating and driving device. The squatting urinal comprises a bedpan and a drain pipe provided with a drain trap, the water flushing part comprises a water duct and a water flushing pipe which is communicated with the water duct and arranged in the squatting urinal, the drain pipe is provided with the drain trap and provided with an opening above or below the drain trap, and the negative pressure generating and driving device is arranged at the opening and is linked with the water delivery part. The squatting pan without the water tank has the advantages of simple structure, stable performance, convenient use, clean flushing and water saving; and can be widely used in houses.

The invention discloses a grouting structure capable of filling a soluble crystal and a construction method. The structure comprises a water permeating section and a grouting section, wherein a water-stop component is arranged between the water permeating section and the grouting section; a water permeating tube is arranged in the water permeating section; the solid-state soluble crystal is filledin the water permeating section; a water inlet of a water drainage tube is arranged in the water permeating section; and elevation of the water inlet of the water drainage tube is greater than that of the water outlet of the water drainage tube. The grouting structure is beneficial for increasing grouting pressure, reduces cracks of the grouting section, and improves sealing effect, so that negative-pressure effect of the water permeating section is improved; during grouting, the water-stop component can be effectively supported, and slurry is prevented from entering the water permeating section to disturb formation of a negative-pressure environment, so that blockage of the water permeating tube is avoided, the water-stop component is prevented from greater displacement as a result of extrusion, and continuous water drainage effect of a slope deep layer is favorably guaranteed, and therefore, the grouting structure is of great significance on solving the water drainage and control problem of a large slope.

The invention particularly relates to a mist convection type mining efficient wet dust collector which solves the problem that an existing dust removal device is low in dust-settling efficiency. The mist convection type mining efficient wet dust collector comprises a columnar machine frame, a coal dust suction port is formed in the lower left end of the columnar machine frame, a sewage collection pond is arranged at the lower right end of the columnar machine frame, and lugs are arranged on the left side and the right side of the upper end of the columnar machine frame. An anti-explosion motor is arranged in the columnar machine frame, fans are arranged on a left output shaft and a right output shaft of the anti-explosion motor respectively, nozzles in the same plane are evenly distributed on the portions, on the right sides of the fans, of the inner wall of the columnar machine frame, a filter screen is arranged on the portion, on the right side of the nozzle, in the columnar machine frame, and a dehydration cylinder communicated with the sewage collection pond is arranged on the portion, on the right side of the filter screen, in the columnar machine frame. The dust collector is reasonable and reliable in structural design, negative pressure capacity for sucking dust-containing airflow is enhanced through phase difference rotation, and by means of the convection action of a rotary spray field and a dust-containing wind filed, the aim of high-efficiency setting of dust, particularly respirable dust, is achieved.

A fire cupping jar includes a cup portion and a lamp that is provided in the cupping jar. The cupping jar can be repeatedly used without needing to be replenished with alcohol and can use fire capable of providing uniform flame.

The invention discloses a multistage cyclic drying system used for feeding particle aureomycin. The multistage cyclic drying system comprises a draft fan, a dust remover, a cyclone separator, a multistage drying mechanism and a preheater, wherein inlets and outlets of the parts are sequentially communicated through pipelines; the pipeline between the multistage drying mechanism and the preheater is a first pipeline; the first pipeline is provided with a pelletizer; a dust exhaust opening of the cyclone separator is provided with air seal machinery; an inlet of the air seal machinery is communicated with the dust exhaust opening of the cyclone separator through the pipeline; an outlet of the air seal machinery is provided with a three-way valve; the three-way valve comprises a first interface, a second interface and a third interface; the first interface and the outlet of the air seal machinery are communicated through the pipeline; the second interface and the multistage drying mechanism are communicated through the pipeline; and the third interface of the three-way valve is provided with a material collecting device. The multistage cyclic drying system can be used for realizing multistage cyclic drying of feeding particle aureomycin, is good in drying effect, and time-saving and labor-saving.

The invention discloses a novel soil sampler which is composed of a ring cutter, a sampling tube, an end cover and a joint. The ring cutter is fixed at the bottom of the sampling tube, the end cover is sealed on the top of the sampling tube, and the joint is fixed on the top of the end cover. The ring cutter is inserted into the bottom of the sampling tube composed of two semicircular segments. The end cover is inserted into a tube cavity of the sampling tube and connected by a fixing screw, and the bottom surface of the end cover is provided with a cylindrical limiting groove. The surface ofthe end cover is provided with a venting hole communicated with the limiting groove, the top of the end cover is provided with a joint groove, and the joint is embedded in the joint groove. A throughhole is respectively opened in the central axes of the joint and the end cover, and the piston rod is inserted into the ring cutter through the through hole in the joint. A piston is fixed at the bottom of the piston rod. The bottom surface of the piston is flush with the bottom surface of the ring cutter, the top surface of the piston is provided with a limiting protrusion, and the outer diameterof the limiting protrusion is equal to the inner diameter of the limiting groove. The soil sampler is simple in structure, capable of preventing failure of sampled soil and preventing sampling failure caused by scattering of the sampled soil in the lifting process.

The invention belongs to the field of new energy automobiles and particularly relates to a high-performance vehicle-mounted refrigerator for a new energy automobile. The high-performance vehicle-mounted refrigerator comprises a box and a box door hinged to the box. A negative pressure barrel is fixedly installed at the upper end of the box. A slider is connected to the inner side wall of the negative pressure barrel slidably in a sealed mode. The two ends of the negative pressure barrel each fixedly communicate with a one-way exhaust pipe. A negative pressure cavity is formed in the box and communicates with the negative pressure barrel through two one-way gas suction channels. The two one-way gas suction channels are formed on the two sides of the slider correspondingly. A plurality of negative pressure holes are formed in the side wall of the negative pressure cavity. The other ends of the negative pressure holes communicate with the outside world. Two sliding grooves are formed in the side wall, close to the box, of the box door. Sealing strips are slidably connected to the side walls of the sliding grooves. The box door can be tightly attached to the box through a negative pressure effect, the box door is prevented from being opened automatically under the inertia effect, the sealing effect between the box door and the box is improved, outward leakage of cold air is prevented, and energy is saved.

The invention belongs to the technical field of grinding machine tools, and particularly discloses a grinding machine tool for a drum type brake pad. The grinding machine tool comprises a machine toolbody and a base, and further comprises a grinding mechanism and a horizontal telescopic air cylinder, wherein the grinding mechanism is matched with the base, and the horizontal telescopic air cylinder controls the grinding mechanism to horizontally move; the grinding mechanism comprises a grinding unit and a negative pressure unit, wherein the negative pressure unit processes waste scraps of thegrinding unit; the grinding unit comprises a motor; an output shaft of the motor is coaxially connected with a plurality of grinding wheel units; a cover is arranged outside each grinding wheel unit;each grinding wheel unit is composed of two grinding wheel machines, and a gap is formed between every two grinding wheel machines; and the negative pressure unit comprises a fan, a bevel gear set, ablocking sheet and a connecting mechanism of the blocking sheet, wherein the fan generates the negative pressure, the bevel gear set can enable the fan to act accurately, and the blocking sheet blocks the waste scraps. According to the technical scheme of the grinding machine tool, the technical problem that normal operation of other mechanisms is influenced due to the fact that the waste scrapsspatter in the grinding process of the drum type brake pad can be solved, and therefore the grinding machine tool can be widely used for grinding the drum type brake pad.

The invention provides a reservoir deepwater sediment cleaning method. The method comprises the following steps that, S1, underwater topography is detected, a desilting range according to the condition of reservoir sediments is determined, and excavation partitions are divided; S2, an assembled water surface operation platform and a negative-pressure silt pumping device reach the working position,the negative-pressure silt pumping device carries out desilting operation, and striping excavation is carried out; sediments pumped by the negative-pressure silt pumping device are conveyed into a slag collecting cage of the slag conveying barge; and the slag conveying barge moves to the shore, the slag collecting cage is hoisted to the shore, the sediments are loaded into a vehicle, and the vehicle conveys the sediments to a designated stacking place; S3, another excavation partition is chose, and the step S2 is repeated; and S4, desilting operation of all excavation partitions is completed,the underwater environment is detected again, and desilting operation is carried out again when necessary. The method is suitable for cleaning various sediments of various reservoirs, is simple and rapid to operate and high in dredging efficiency, and does not influence normal power generation of a hydropower station, sand discharging hole operation and flood discharging.

The invention discloses a two-stage hydrogen fuel cell stack gas supply device driven by a motor. The two-stage hydrogen fuel cell stack gas supply device comprises a drive motor, a primary compressor, a secondary compressor and an interstage communicating pipeline. The drive motor comprises a motor shell, a motor stator, a motor main shaft and a high-speed motor rotor; gas is exhausted by a hydrogen fuel cell and enters a turbine, the turbine drives a coaxially rotating gas compressor to reduce the power consumption of the gas compressor and reduce the gas temperature the gas exhausted by thehydrogen fuel cell through the heat release of the turbine, and the gas exhausted by the hydrogen fuel cell enters the drive motor to perform heat exchange for a high-speed motor rotor to reduce thetemperature of the high-speed motor rotor, increase the stability of the motor and improve the negative pressure capacity and the service time of the motor. The two-stage hydrogen fuel cell stack gassupply device cools the system by employing the energy of the tail gas of the fuel cell to improve the power generation efficiency of the fuel cell while reducing the cooling energy consumption.

The invention discloses a device for needle core withdrawing together with vacuum suction in one-handed performance for puncture biopsy, including a tube body, a hollow puncture needle, a flexible puncture needle core, a piston rod, a rubber piston sleeve, a piston driving rod and a gear component; a division plate divides the space in the tube body into a piston rod socket and a piston driving rod socket, the puncture needle is mounted on a needle connection tube, the piston rod includes piston rod teeth, the piston driving rod includes piston driving rod teeth, the piston rod is provided with a piston rod needle core socket, the rubber piston sleeve is provided with a rubber piston sleeve needle core socket, a tube body needle core socket and tube body needle core thread holes are arranged on the tube body, tube body needle-core clamping screws are arranged on the tube body needle-core thread holes, and a needle core guide pulley device is arranged on the piston rod. Therefore, lifting and thrusting of the puncture needle can be realized, and the puncture needle core withdrawing together with vacuum suction can be carried out at the same time.

The invention provides a pressurizing shower head. The pressurizing shower head comprises an upper face cover, a lower face cover and a handholding portion, and the upper face cover and the handholding portion are integrally formed; the upper face cover and the lower face cover are fixedly connected; the portion, close to the handholding portion, of the lower face cover is provided with an air inlet hole in the water outlet direction; the portion, directly facing the air inlet hole, of the upper face cover is provided with a water isolating part, an air inlet cavity is formed between the waterisolating part and the lower face cover, and the air inlet cavity communicates with the air inlet hole; a negative-pressure mold cavity is formed between the upper face cover and the lower face coverand communicates with the air inlet cavity; the portion, close to the handholding portion, of the upper face cover is provided with an air inlet groove in the water outlet direction; and the air inlet groove communicates with the negative-pressure mold cavity and a water inlet way. By applying the technical scheme, the purpose of being arranged on the face covers can be achieved, and water flow can be blocked from flowing out from the air inlet hole.