8results about How to "Reduce air pulsation" patented technology

The invention discloses a noise reduction device and a noise reduction method for an exhaust pipe of a magnetic levitation vacuum pump. The noise reduction device comprises a gradual noise reduction pipe, one end of the gradual noise reduction pipe is connected to the exhaust pipe through an air intake straight pipe, and the other end is connected to an air outlet straight pipe; along the exhaust flow direction, the diameter of the gradual noise reduction pipe gradually increases, a diverter noise reduction plate is provided in the gradual noise reduction pipe along the axial direction, the diverter noise reduction plate divides the gradual noise reduction pipe into two independent noise reduction channels, and a plurality of guide vanes are provided on the surface of the diverter noise reduction plate on a side close to the air intake straight pipe along the air intake direction; the gradual noise reduction pipe of the invention uses the diverter noise reduction plate to divide the pipe into two noise reduction channels, sound energy can be effectively dissipated in the channels, air flow pulsation is small, thereby reducing exhaust noise; the arc structure of the guide vane effectively reduces the original BPF noise level, reduces the secondary harmonic, makes the noise broadband, and improves the noise reduction effect.

The reciprocating compressor silencer comprises a shell and a separator, the shell is provided with an air inlet and an air outlet, the separator is arranged in the shell and divides an inner cavity of the shell into an upper cavity and a lower cavity, the upper cavity is communicated with the air outlet, the lower cavity is communicated with the air inlet, and the air inlet is communicated with the air outlet. A plurality of reflecting rib plates are arranged on the inner wall of the top of the shell and divide the upper cavity into a plurality of cavities, an air inlet hole communicated with the upper cavity and the lower cavity is formed in the separator, the air inlet hole and the air outlet are located in the same cavity, and the side edges of the bottoms of the reflecting rib plates are obliquely arranged relative to the horizontal plane. The inclination angles of the bottom side edges of the multiple reflection rib plates are different, gaps are formed between the bottom side edges of the multiple reflection rib plates and the isolation piece, and the widths of the gaps between the multiple reflection rib plates and the isolation piece are different. The technical problem that an existing device cannot give consideration to improvement of the air suction efficiency and reduction of noise is solved, and the air suction efficiency and the noise reduction performance are improved.

The invention belongs to the technical field of ships, and discloses a marine fan impeller adjusting method and a marine fan. The marine fan impeller adjusting method comprises the following steps that external parts of the fan are detached, a fan flange and a plurality of blades installed on the fan flange are placed on a working table, the fan flange is fixed to the working table, and the fan is fixed to the working table; measuring an original blade angle, measuring the angle of the blade tip of each blade by using a measuring tool, recording the angle as an original angle alpha, loosening a bolt which is positioned at the blade root of each blade and is connected with a fan flange, knocking one side of the blade root from the front surface or the back surface of each blade, measuring the angle of the blade tip of each blade by using the measuring tool, and recording the angle as the original angle alpha; the heightening angle of the blade is alpha + n, the lowering angle of the blade is alpha-n, and the bolt is fastened. According to the marine fan impeller adjusting method, by adjusting the angles of the blades, the stability and reliability of operation are guaranteed, and the unreasonable conditions that power is too large or too small under part of working conditions due to the fact that fan type selection is fixed are avoided.

The invention provides a non-return assembly, a pump body structure and a compressor, and the non-return assembly comprises a non-return structure and a non-return valve plate; the non-return structure is provided with an annular wall; the check valve plate is arranged on the annular wall in a sleeving manner and is used for covering the exhaust port of the pump body; when the exhaust port exhausts air, the check valve plate can be pushed by the exhausted air to be away from the exhaust port in the direction of the center line of the annular wall so as to open the exhaust port. When the exhaust port stops exhausting, the check valve plate can return to the exhaust port in the direction of the center line of the annular wall so as to cover the exhaust port; when the check valve plate moves in the direction of the center line of the annular wall, the annular wall can guide the check valve plate so as to limit the freedom degree of the check valve plate, the risk that the check valve plate inclines in the process of opening the exhaust port is reduced, and mechanical friction loss is reduced.

The utility model discloses a vacuum buffer tank for a Roots vacuum unit, which relates to the technical field of vacuum buffer tanks and comprises a tank body, a cyclone separator and a buffer gas tank. Flow guide fan blades with holes are arranged in the tank body, a smooth inclined baffle is installed in the tank body, a floating ball liquid level meter and an electric ball valve are installed at the bottom of the tank body, an air inlet is formed in the left side of the cyclone separator, an air outlet is formed in the right side of the cyclone separator, and an ash hopper is installed below the cyclone separator. Under the combined action of a motor, a bevel gear set, a belt transmission device and a straight rod, airflow can be driven by a spiral fan blade to be guided to a gaseous buffer layer from an air inlet, then is driven by rotation of a fan to be guided into a buffer gas tank from the gaseous buffer layer, and is exhausted from an air outlet; the gas-liquid-solid three-phase separation improves the efficiency of a vacuum system manufactured by the Roots vacuum unit, and prevents solid particles or liquid from damaging equipment.

The utility model relates to refrigerating machine technical field discloses a kind of gas wave refrigerating machines, including shell, the bottom surface of the shell is fixedly connected with machine base, the end side of the shell is communicated with air inlet pipe, the end surface of the air inlet pipe is fixedly communicated with flange one, the end side of the flange one is fitted with flange two, and the filter assembly is installed between the flange one and flange two, the top surface of the shell is fixedly connected with motor, the output end of the motor is fixedly connected with rotating shaft, the outer ring of the rotating shaft is fixedly sleeved with runner distributor, the outer ring of the runner distributor is communicated with nozzle, the outer ring of the shell is communicated with multiple oscillation pipes, and the end of multiple oscillation pipes is respectively connected with cold air outlet pipe, and the bottom surface of the shell is communicated with hot gas outlet pipe.The utility model uses the grouping alternation mode of the number of nozzle less than the number of oscillation pipe, and the running process is smooth, airflow pulsation is small, and the overall vibration and noise of equipment are lower, and the operation reliability is stronger.

The present invention belongs to the technical field of ion compressors, and in particular, relates to a gas-liquid two-phase visualization test system, a safe operation method, and a data processing method. A gas-liquid two-phase visualization test system includes an intake module, a cylinder simulation module, and an exhaust module connected in series in sequence. The cylinder simulation module includes two or more stages of visual piston units connected in series, and an interstage buffer for temporarily storing test gas is also provided on the pipeline between adjacent visual piston containers; a limit device is provided outside the straight pipeline directly connected to the visual piston container; the intake module generates test gas, and the test gas flows through the visual piston units connected in series in the cylinder simulation module in sequence, and the visual piston container in the visual piston unit performs a piston reciprocating motion to compress the test gas and then send it to the exhaust module, and the exhaust module discharges the compressed gas into the surrounding environment. The present invention can simulate and observe the complex gas-liquid flow field in the cylinder of the ion compressor in a realistic, efficient and safe manner.

The present invention discloses a liquefied air energy storage system, including an air liquefaction subsystem, a cold storage and heat regenerator, a liquid air storage tank, and a power generation subsystem. The cold storage and heat regenerator is provided with a heat exchange channel, and the liquid air storage tank is provided with a liquefied air inlet, a liquefied air outlet, and a cold air outlet. The air liquefaction subsystem, the heat exchange channel of the cold storage and heat regenerator, and the liquefied air inlet of the liquid air storage tank are sequentially connected through a liquefaction pipeline. A throttle valve is provided in front of the liquefied air inlet. The liquefied air outlet of the liquid air storage tank, the heat exchange channel of the cold storage and heat regenerator, and the power generation subsystem are sequentially connected through a gasification pipeline; a supercooling subsystem for cooling the air is provided on the liquefaction pipeline between the throttle valve and the heat exchange channel. The present invention also discloses a working method of a liquefied air energy storage system. The supercooling subsystem is added in the present invention to provide coldness for the liquefied air, so that it reaches a lower temperature and improves the liquefaction rate.