8results about How to "Reduce pulsation" patented technology

This invention provides a pump body assembly for a compressor and a compressor. The pump body assembly includes: a first cylinder with a suction channel, comprising a main channel and a branch channel, the axis of the main channel being inclined relative to the axis of the compressor; a connecting channel on a partition member, the axis of the connecting channel being inclined relative to the axis of the compressor; and an intake channel on a second cylinder, the axis of the intake channel being inclined relative to the axis of the compressor. The main channel, the connecting channel, and the intake channel are sequentially connected. The intake end of the main channel is located on the side of the first cylinder and / or on the end face of the first cylinder facing away from the partition member. The intake channel communicates with the chamber of the second cylinder, and the branch channel connects the main channel and the chamber of the first cylinder. The technical solution of this invention solves the problem of high suction resistance in the second cylinder of the compressor in the prior art, which leads to reduced overall energy efficiency.

The utility model provides a kind of air leakage screw conveyer device, the utility model relates to screw conveyer mechanism technical field, including screw conveyer assembly, driving mechanism, protection subassembly and negative pressure component;The screw conveyer assembly includes the shell extending along left and right direction and the screw conveyer rod piece extending along left and right direction;By the setting of negative pressure component, in negative pressure component, shell and negative pressure storehouse interior pressure is lower than external atmospheric pressure, if feeding and discharging place are completely open, outside air will rush in a large amount, it will lead to unable to maintain the required vacuum degree, and the air that rushes in can interfere with the stable flow of material, even cause blockage, and in the design, second helical blade segment cooperates pressure door, and a dynamic material seal is formed in shell interior jointly.The material with high filling degree itself becomes the barrier to prevent air from entering, achieving the effect of physical sealing, thereby ensuring the negative pressure state inside the system.

The invention discloses a voltage vector synthesis-based current prediction control method for a switched reluctance motor, and belongs to the field of switched reluctance motor control. The current prediction control method comprises the following steps: obtaining a given current of a rotor according to a PI controller of a rotating speed ring; determining the region of the rotor by measuring the actual mechanical position of the rotor; selecting a corresponding voltage vector through an area where the rotor is located; determining the duty ratio of the voltage vector according to the given current; and sending the selected voltage vector action time and a switching signal corresponding to the duty ratio to an asymmetric half-bridge power converter, and controlling the switched reluctance motor. The method has the advantages that the maximum error given by current tracking is reduced by about 75%, the current pulsation rate is reduced by about 7%, the current tracking given effect is obviously improved, and the problems that the current peak value is high and the current pulsation is large in the commutation period of a traditional finite set model prediction control algorithm are effectively solved.

The utility model discloses a peristaltic pump which comprises a pump head, an inner installation cavity is formed in the pump head, and two installation holes communicated with the inner installation cavity are further formed in the pump head. The pump core assembly comprises a rotating core body and a plurality of extrusion rotors, an annular groove is formed in the outer circumference of the rotating core body, a plurality of mounting grooves are formed in the groove bottom face of the annular groove, and a plurality of rolling balls are arranged in the mounting grooves. The extrusion rotors are rotatably arranged in the annular grooves and abut against the balls in the corresponding installation grooves. A pump pipe; wherein the rotating core body is rotatably arranged in the mounting inner cavity, the pump pipe extends into the mounting inner cavity and surrounds the outer portion of the rotating core body, the extrusion rotor abuts against the pump pipe, and the two ends of the pump pipe extend out of the mounting inner cavity through the corresponding mounting holes. The use reliability and stability of the peristaltic pump are improved, so that the service life is prolonged.

The utility model relates to vortex spinning machine field discloses a vortex spinning machine air intake noise reduction device, including the air intake cover for vortex spinning machine air intake noise reduction, the air intake cover's air outlet end is fixedly installed with the buffer pipe, the inboard of buffer pipe is equipped with stabilizing mechanism, the other end of buffer pipe is fixedly installed with the noise reduction cylinder, the inboard of noise reduction cylinder is equipped with the noise reduction mechanism, the outside of noise reduction cylinder is fixedly equipped with the sound insulation shell. The utility model has the advantages and effects that: can intercept the impurity dust in the airflow while air intake, prevent its into the equipment, pollute the yarn while producing the noise, guarantee the clean of equipment internal environment, and can make the airflow more uniform and stable, reduce the pulse and fluctuation of airflow, reduce the generation of noise, increase the practicability of equipment, utilize the noise reduction mechanism better match the propagation characteristic of sound wave, improve the sound absorption effect.

The embodiment of the present invention discloses a gas impeller flowmeter and a gas flow metering method, which are invented to reduce the pulsation phenomenon caused by the instantaneous flow of the discharge. The gas impeller flowmeter includes more than two metering chambers; a impeller group is respectively provided in each metering chamber, and the more than two impeller groups are arranged in parallel; the more than two impeller groups are located in different relative metering positions in their respective metering chambers. The embodiment of the present invention is suitable for occasions for metering of fuel gas and other gases.

This invention discloses a shock absorber, suspension system, vehicle, and suspension control method for eliminating high-frequency pulsations. The shock absorber includes: a cylinder containing a main piston that divides the cylinder interior vertically into an upper main chamber and a lower main chamber; a compression valve and a return valve on the main piston; a piston rod connected to the top of the main piston, extending upwards through the cylinder; and an inner shell connected to a hollow rod. An elastic component is located inside the inner shell, dividing the inner shell vertically into an upper secondary chamber and a lower secondary chamber. The hollow rod extends upwards through the main piston, with its two ends connected to the upper main chamber and the upper secondary chamber, respectively. A throttling orifice connected to the lower secondary chamber is located on the bottom side of the inner shell. This invention adds a structure within the cylinder that can elastically attenuate fluid impacts, effectively reducing pulsations, minimizing the impact of large-amplitude, high-impact compressive damping forces, reducing the direct transmission of road impacts to the vehicle body, and improving vehicle ride smoothness.

The utility model discloses a low-noise dust collection volute fan for a saw bench, which comprises a volute-shaped outer shell and a motor arranged on the side edge of the outer shell, an impeller is arranged on a rotating shaft of the motor, the impeller is positioned in the outer shell, an inner shell is arranged in the outer shell, an air cavity is arranged between the outer shell and the inner shell, and the air cavity is communicated with the inner shell. The air cavity is filled with sound-absorbing cotton; the inner shell is provided with an exhaust port, a flow guide plate matched with the exhaust direction of the exhaust port is arranged at the joint of the lower side of the exhaust port and the interior of the inner shell, outlet air flow generated when the impeller rotates is exhausted through the exhaust port, meanwhile, the impeller rotates to generate a separation vortex, and the outlet air flow and the separation vortex are separated through the flow guide plate. The situation that outlet air flow collides with separation vortexes is avoided, so that vibration and pulsation of the vortexes are reduced, noise is reduced, meanwhile, noise is absorbed and isolated through the air cavity and the sound absorption cotton in the air cavity, transmission of the noise is further reduced, and therefore the working noise of the fan is effectively reduced.