6results about How to "Reduce pressure pulsation" patented technology

The present application belongs to the field of fluid machinery, and discloses a centrifugal pump volute with a composite noise reduction structure, which comprises a volute body with a base circle radius R, a volute chamber is formed inside the volute body, and a plurality of micro guide vanes are distributed in the circumferential direction on the inner side of the inlet of the volute body; two semicircular grooves are arranged on the upstream segment of the volute chamber inner wall baffle in front and back symmetry along the spiral line; two guide plates are arranged at the baffle of the volute body, the guide plate close to the inlet side of the volute body is a front guide plate, and a plurality of guide holes are formed on the front guide plate; a plurality of cavities are uniformly arrayed on the wall surface of the baffle of the volute body; and the bending directions of the micro guide vanes and the guide plates are consistent with the water flow direction. The present application optimizes the inlet flow through the micro guide vanes, suppresses vortex through the semicircular grooves, and cooperatively reduces the pressure pulsation through the guide plate and the cavity structure, so that the fluid noise is effectively reduced while the hydraulic performance is maintained, and the comprehensive performance is obviously improved.

The utility model discloses a water pump and have its heat management system, vehicle, water pump includes: the casing of first recessed cavity is defined, the pump shell of second recessed cavity is defined, and first recessed cavity and second recessed cavity constitute the pump cavity with liquid outlet, and the communicating place of first recessed cavity and liquid outlet is equipped with first separate tongue, and the communicating place of second recessed cavity and liquid outlet is equipped with second separate tongue, on the circumference of pump cavity, the connecting end of first separate tongue is connected with casing and the end face of free end is first tongue face, and the connecting end of second separate tongue is connected with pump shell and the end face of free end is second tongue face, in the direction of axially away from second tongue face, first tongue face is inclined in the direction of connecting end to free end along the circumference, and / or, in the direction of axially away from first tongue face, second tongue face is inclined in the direction of connecting end to free end along the circumference. Water pump according to the utility model embodiment has the advantages of reducing the pressure pulsation produced when the water is thrown from the impeller assembly, reducing the vibration and noise of water pump operation etc.

The invention discloses a circular tube type diffuser and a design method, relates to the technical field of engine research, and aims to solve the problem that the safety performance of a turbine pump is reduced due to a diffuser in the prior art. The circular tube type diffuser comprises a ring inner cylindrical surface, a ring outer cylindrical surface and a plurality of target channels which are evenly distributed in the circumferential direction and extend from the ring inner cylindrical surface to the ring outer cylindrical surface in the radial direction. The cross section of each target channel is a circle, the center line of each target channel is a straight line, the target surfaces of the target channels are tangentially connected with the ring inner cylindrical surface, and the opposite surfaces of the target surfaces are tangentially connected with the ring outer cylindrical surface; an inlet transition section, a throat section and an expansion section are sequentially arranged in the multiple target channels in the direction from the ring inner cylindrical surface to the ring outer cylindrical surface. The expansion section is a beveled arc expansion section or a beveled spiral line expansion section; the expansion section is used for reducing liquid flow loss of an outlet of the diffusion channel and pressure pulsation of an inlet of the diffuser and an outlet of the turbine pump; therefore, the vibration level of the turbine pump is reduced, and the safety is improved.

To address the limitations of existing pulse detonation combustors using detonation jet ignition, which require long jet tubes and thus restrict the increase of their operating frequency, and the dependence of stable operation of pulse detonation turbine engines on the performance and reliability of the igniter, this invention proposes a pulse detonation combustor based on rotating detonation wave ignition. This invention utilizes the relatively high frequency of rotating detonation combustion and the requirement for only a single ignition. The rotating detonation wave generated by the rotating detonation chamber serves as a continuous high-energy ignition source, igniting the explosive mixture within the detonation jet channel. This creates a high-energy detonation jet at the channel's exit, which then flows into the pulse detonation tube and ignites the explosive mixture within. This invention, while maintaining the excellent initiation performance of the detonation jet ignition method, overcomes the adverse effects of long jet tubes and high-frequency ignition on the efficient and stable operation of pulse detonation turbine engines.

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 application relates to the technical field of micro fans, in particular to a multi-jet-hole guide fan, which comprises a fan body and a guide device arranged on one side or both sides of the fan body through a gap, at least two jet-hole units are arranged on the side of the fan body close to the guide device, and each jet-hole unit comprises at least two jet holes arranged at intervals, in the application, the design of a single first guide channel with multiple jet holes can help to expand the suction range when the airflow sprayed by the multiple jet holes enters the corresponding first guide channel after passing through the guide cavity, meanwhile, the one-to-many mode can reduce the local pressure peak value, inhibit the formation of turbulent flow and the impact on the wall surface of the first guide channel, and is beneficial to improving the flow and reducing the noise; on the other hand, the setting of the convex part can force the circumferential gas to smoothly turn along the surface of the convex part, reduce the airflow separation area, and reduce the instability of the shear layer.