11 results about "Air pressure effects" patented technology

The application provides a variable stiffness method of a vine-like inflatable arm and a position control method thereof, and belongs to the technical field of soft robots. The inflatable arm realizes the tip eversion to be elongated to a desired length through the air pressure effect, the pressure difference in the annular variable stiffness air bag around the arm rod is adjusted to control the local stiffness of the inflatable arm, the wrinkle is generated at the position with the lowest stiffness in combination with a motor-rope device, and the steering control of the inflatable arm is realized; when the position control is performed, sequential control algorithm is adopted to sequentially perform closed loop control on each joint based on the end trajectory tracking task, and three kinds of criteria are established in the algorithm to help the end trajectory tracking task to be completed. The variable stiffness range of the vine-like inflatable mechanical arm is improved, a new manufacturing process is adopted, the level of tip movement is improved, and the sequential control algorithm can help the inflatable arm to realize precise multi-joint parallel collaborative control.

The utility model belongs to the technical field of automobile parts, especially relates to a check valve, including valve body, the valve body, sealing plate and the pressing plate are connected through the connecting assembly, and the connection is fastened, and the anti-loose effect is superior, and the gap is left between the upper portion of pressing plate and sealing plate, is provided with one -way air inlet subassembly between the air inlet end and the air outlet end of valve body, when the air inlet end pressure of valve body is too high, the air pressure effect pushes open one -way air inlet subassembly and enters the air outlet end, when the air outlet end pressure is too high, the air pressure effect pushes open sealing plate, gas flows out, and after pressure balance, sealing plate is automatically closed, double one -way air outlet, also can guarantee gas flow direction correct after the situation that sealing plate is used too long and cannot be closed or breaks, avoids the trouble of equipment caused by backflow, backflow.

The utility model discloses a nucleic acid extraction and amplification detection kit which comprises a shell, a reaction tank is fixedly connected to the inner wall of the shell, a top cover is arranged at the top of the shell, a fixed pipe is fixedly connected to the bottom of the top cover, and a sealing cover for sealing the reaction tank is fixedly connected to the bottom of the fixed pipe; the top of the top cover is fixedly connected with a motor, one end of an output shaft of the motor is fixedly connected with a driving shaft, and the driving shaft rotationally penetrates through the sealing cover. According to the reaction tank disclosed by the utility model, a solution can be mixed through the stirring blades and is matched with the fixed cylinder, so that the solution can circularly flow, the heating or annealing uniformity is further improved, the test effect is further improved, the temperature detection accuracy is also improved, and the temperature can be accurately detected in the heating and cooling processes of the reaction tank. Air can enter the reaction tank, so that the reaction tank is prevented from being damaged due to the influence of air pressure, the use safety is improved, the interior of the reaction tank is conveniently cleaned, and people can conveniently use the reaction tank.

The utility model discloses a kind of sealing structure of air cleaner, including cylinder, cylinder cover, the top of the cylinder is provided with annular groove, detachable fixedly connected with assembly seat in the inside of annular groove, the top and bottom of the assembly seat are fixedly embedded with sealing elastic rubber membrane, the top of the assembly seat is fixedly interconnected with connecting pipe;The top of the assembly seat is equipped with filter core by limiting frame;Multiple snap components are jointly installed between the cylinder cover and the cylinder.The utility model in, adopt inflatable dynamic sealing structure, sealing elastic rubber membrane is inflated and deformed by air pressure effect, respectively, and filter core installation ring and annular groove inner wall are pressed tightly, form double seal, significantly improve the sealing reliability;While setting air pressure detection component real-time monitoring sealing cavity pressure, can find leakage anomaly and alarm in time, greatly improve the protection level and system operation safety of engine.

The efficient table top range hood comprises a machine shell and a filtering device used for filtering oil smoke, a smoke suction channel is formed in the machine shell, a suction port and an exhaust port which are communicated with the smoke suction channel are formed in the front end and the rear end of the machine shell respectively, and a side air outlet channel is formed in the position, corresponding to the rear portion of the suction port, of the periphery of the machine shell. The side air outlet channel and the smoke suction channel are mutually independent, a side air outlet is formed in the side air outlet channel, airflow blown out by the side air outlet forms an air wall, the side air outlet channel is further provided with an air inlet, and the air inlet is used for being connected with a positive pressure air source. According to the ventilation wall formed by the ventilation wall forming device, airflow power is independently provided by the air supply fan, the coverage range and the air pressure effect of the ventilation wall are ensured, and therefore escape of oil smoke in the distance is reduced, and more oil smoke is further treated after entering the air suction channel.

The invention provides an automatic exhaust type piezometric tube monitoring device, belongs to the technical field of water pressure monitoring, and can at least partially solve the problems that the existing piezometric tubes of all hydropower stations usually adopt automatic measurement, the measurement frequency is high, and manual pressure relief cannot meet the measurement requirements; in order to solve the problems that in the prior art, in the prior art, in the prior art, water flow can be discharged from a water outlet along with gas during pressure relief, and the measurement result is affected, the device comprises an exhaust device connected with a pressure measuring pipe, and the exhaust device is provided with a lifting rod, a controller, a conducting strip, a device pressure meter, an atmospheric pressure meter, an electromagnetic valve and a breathable water filtering film. According to the invention, automatic exhaust before measurement can be realized or irregular exhaust can be realized according to the air pressure influence condition, and the water pressure in the pressure measuring pipe is ensured not to leak during exhaust, so that the influence of the air pressure and the pressure relief process on the water pressure measuring result is reduced, and the observation efficiency, the standardization and the data trueness of the air-containing pressure measuring pipe are improved.

The application discloses an air inlet ring, a centrifugal fan and an extractor hood, wherein the air inlet ring comprises an air inlet area, the air inlet area has a contour line, the contour line is an epitrochoid, the epitrochoid is a locus formed by a fixed point on the circumference of a moving circle when the moving circle rolls along a fixed circle without sliding, and the epitrochoid is a cardioid epitrochoid. Compared with the prior art, the application has the advantages that: the air inlet area is formed by the epitrochoid, the epitrochoid can adapt to the air inlet difference of the centrifugal fan at different angles, the backflow leakage in the high back pressure environment is reduced, the air pressure effect is increased, and the efficiency and working condition are more matched in the case that the extractor hood has a large resistance (large back pressure) and a public flue; in addition, the epitrochoid is formed by the rolling of a mathematical circle, the circumferential change is smoother in the other areas except the intersection point, and the change is more adaptive to the gradual change of the air inlet of the volute of the centrifugal fan at different areas.

The application provides a microwave electrothermal thruster ground test system and method, and relates to the field of microwave electrothermal thruster ground test systems and methods.The microwave electrothermal thruster ground test system comprises a microwave source, a resonant cavity normal-pressure section, a resonant cavity low-pressure section, a nozzle and a vacuum chamber assembly; the nozzle is arranged in the vacuum chamber assembly, the inlet of the nozzle faces outward of the vacuum chamber assembly, and the outlet of the nozzle faces inward of the vacuum chamber assembly; the microwave source, the resonant cavity normal-pressure section and the resonant cavity low-pressure section are arranged outside the vacuum chamber assembly. By arranging the microwave source, the resonant cavity normal-pressure section and the resonant cavity low-pressure section outside the vacuum chamber assembly and arranging the nozzle in the vacuum chamber assembly, the problems of large volume of the vacuum chamber, easy discharge of the microwave source and water cooling for heat dissipation when the microwave source and the resonant cavity are placed in the vacuum chamber as a whole are solved, and the problems of the influence of background air pressure on thrust test when the microwave source and the resonant cavity are placed in the atmospheric environment as a whole are solved, so that the volume of the vacuum chamber can be effectively reduced, and the test efficiency can be improved.

The utility model discloses a traditional Chinese medicine application drying and storing device which comprises a storing box body, the storing box body is a cavity shell of a rectangular structure, one side of the storing box body is open and hinged to a sealing door, a plurality of storing partition layers are arranged in the storing box body, and a plurality of storing boxes are arranged on any storing partition layer in a matrix mode. The utility model relates to the technical field of traditional Chinese medicine application storage, in particular to a traditional Chinese medicine application drying and storing device, a box body is adopted for storing traditional Chinese medicine application, a plurality of traditional Chinese medicine application are placed in a storage box in a group, and independent ventilation dryers are arranged in the storage box body and are independently mounted, so that the structure is simple, and the disassembly, assembly and maintenance are convenient; air is pumped into the storage box body through independent ventilation drying, the temperature and humidity in the storage box body are kept normal, the flow guide effect of the ventilation flow channel is matched, air circulation in the storage box body is kept through the passive air pressure effect, then the temperature and humidity are kept, and more energy is saved.

The invention belongs to the technical field of cattle and sheep house ventilation, and particularly relates to a ventilation device for a cattle and sheep house in a plateau pasturing area, which comprises an inner pipe and a sealing cover. The outer pipe and the inner pipe are installed by taking the housing ceiling frame as a support, and the base is installed on the ground in the housing. Due to large day-night temperature difference in plateau areas and strong sunlight in daytime, sunlight penetrates through the outer pipe to heat interlayer air and the wall end of the inner pipe. Hot air in the interlayer rises and is exhausted from the top, and cold air is sucked from the bottom to form circulation so as to preheat air entering the interlayer. After the inner pipe is heated, the temperature rise of dirty air in the inner pipe is faster, and strong suction force is formed to exhaust waste gas. The double effects obviously enhance the hot-pressing ventilation effect and overcome the influence of low air pressure. Interlayer air becomes a heat preservation layer due to large temperature difference at night, heat loss of the inner pipe is reduced, and certain ventilation draft is maintained. The sealing performance of the interlayer of the inner pipe and the outer pipe and the upper end and the lower end is controlled by the sealing cover, the sealing frame and the inserting rod.