45results about How to "Reduce pulsating pressure" patented technology

The present invention relates to a pressure pump which is used for reducing the pulse in a vehicle slippage control system. The pressure pump comprises the components of a hollow bush which is fixed on the casing of the pump and a plunger piston that is supported by the internal spring in the bush. The pressure pump also comprises a valve ball which is used for blocking an outlet which is flowed by the working liquid that flows into the plunger piston, a one-way valve spring which is fixed at the outlet of the plunger piston and supports the valve ball, a one-way valve which is fixed on the cover on the plunger piston, a one-way valve outlet which comprises a valve ball and a one-way valve, and a hole component which is provided between the bush and the cap that is fixed at the end part of the bush. The hole piece is provided at a position which discharges the work liquid in the plunger piston to reduce the fluctuating pressure caused by the plunger piston that does reciprocating motion because of the eccentric wheel. Therefore, the fluctuating pressure generated in the pump can be reduced from 20 bar to 5 bar or less.

The invention relates to a low noise control valve. The low noise control valve comprises a valve body, wherein a valve plug is mounted in the middle of the valve body by an upper valve seat; a valve cover is mounted on the top of the valve plug; a valve rod is mounted in the middle hole positions of the valve cover and the valve plug; the upper part of an elastic air bag cavity is clamped in the valve plug; the lower part of the elastic air bag cavity is mounted in an inflow flow guide device; the inflow flow guide device is connected with the valve plug by a bolt; a valve sleeve is mounted on the outer end of the inflow flow guide device; the valve sleeve is mounted on a lower valve seat; a sandwich outflow rectifying device is welded on the wall of a valve body outflow pipe. The low noise control valve has the advantages that the structure is compact and reasonable, the installation is convenient, the use reliability is good, the occurrence of cavitation is inhibited, and the pulsating pressure of fluid is attenuated.

The present invention provides a fuel delivery pipe for an electronic fuel injection type automobile engine, which can reduce the shock wave and pulsating pressure generated with the opening and closing of the fuel nozzle, and can reduce the occurrence, transmission, and propagation of noise in the high-frequency region ,radiation. A flexible absorbing surface is formed in a flat or arcuate shape on the outer wall of the communicating pipe, and ribs intersecting the axial direction of the communicating pipe are fixed to the outside of the absorbing surface, or recesses are formed on the absorbing surface. Or, install a clamping member that clamps the connection installation surface and the absorption surface of the connecting pipe from both sides. The position of the above-mentioned rib or clip is preferably in the vicinity of the end of the communication pipe in the axial direction. As a result, the noise in the high-frequency region radiated from the fuel delivery pipe is reduced, and the pulsating pressure and shock waves of the fuel flowing into the connection are reduced by deflection of the absorbing surface.

The present invention relates to a compressor, when refrigerant gas to be discharged to the outside of the compressor is discharged into a rear refrigerant gas discharge chamber and refrigerant gas to be discharged to the outside of the compressor is discharged to a front refrigerant gas discharge chamber , the compressor can reduce the pulsation pressure of the refrigerant gas in a multi-step manner, thereby achieving an excellent effect of reducing the pulsation pressure of the refrigerant gas and significantly reducing the pressure caused by the pulsation of the refrigerant gas. noise.

This invention relates to one breaker operation structure and in detail to one multi-memory parallel drive hydraulic operation structure with large power in large operation situations, which comprises work cylinder, operation structure piston bar, disc spring set, memory cylinder, supportive ring, memory rack, control valve, oil channel and pressure oil pump. The invention is characterized by connecting disc memory device.

The invention discloses a plasma-based automobile noise reduction method and system, comprising a speed measurement circuit, an analysis control unit, a plasma generator and a noise detector; the speed measurement circuit is connected with the analysis control unit, and the analysis control unit is respectively connected with the plasma generator And noise detector, speed measuring circuit, analysis control unit and noise detector are all set inside the car, plasma generator and noise detector are respectively set at the head and tail of the car, which solves the problem of excessive car noise.

The invention discloses a vortex generator for a propeller type ship and the ship. A first oncoming surface is added, and the first oncoming surface is perpendicular to the bottom surface, so that an additional vortex can be generated and superimposed on the main vortex to obtain an enlarged wake. , an energy-enhanced mixing vortex. When the mixed vortex is transmitted to the flow lag area at the stern, it can inhibit the flow separation, curb the generation of excessive low pressure area, reduce the change gradient of the accompanying flow at the propeller blade, make the cavitation at this position develop smoothly, and reduce the generation of cavitation due to cavitation. The pulsating pressure, so as to achieve the effect of shock absorption, while reducing sailing resistance.

The invention provides a rotating inclined disc type compressor. A gas suction expansion portion is arranged in the middle of a rear cover exhaust cavity. A rear cover gas suction passageway communicated with a gas suction opening is located inside the gas suction expansion portion. The outlet end of the expansion portion is communicated with a gas suction pressure stabilization area. A main expansion passageway communicated with the gas suction pressure stabilization area is arranged in a rear cylinder. The main expansion passageway is communicated with a rear cylinder gas suction passageway through auxiliary expansion passageways. The rear cylinder gas suction passageway is communicated with a rear cover gas suction cavity and a crank cavity. A front cylinder gas suction passageway communicated with the crank cavity is formed in a front cylinder. The front cylinder gas suction passageway is communicated with a front cover gas suction cavity of a front cylinder cover. Gas refrigerating fluid simultaneously enters the rear cover gas suction cavity of the rear cylinder cover, the crank cavity and the front cover gas suction cavity of the front cylinder cover after passing through the auxiliary expansion passageways in the rear cylinder in the gas suction process. The gas refrigerating fluid is sucked through the auxiliary expansion passageways step by step, and therefore the sucked gas refrigerating fluid is made more stable, and gas pulsation and noise are effectively reduced.

The invention discloses an active blowing control device for vibration-attenuation protection of a cylindrical structure. The active blowing control device comprises one or more groups of front and back blowing stagnation points, an air guiding pipe and blowing equipment, wherein the blowing equipment is connected with the air guiding pipe, the air guiding pipe is connected with the front and backblowing stagnation points, respectively and is arranged in the cylindrical structure, one or more groups of front and back blowing stagnation points are respectively symmetrically distributed on a windward side and a leeside, each group of front and back blowing stagnation points are located on the same section, and the blowing directions of the front and back blowing stagnation points are parallel with the direction of an incoming flow; the incoming flow acts on an aerodynamic contour formed by airflow blowing from front stagnation points; and airflow blowing from back stagnation points is capable of breaking a vortex in a tail flow so as to preventing the tail flow from forming alternate-falling vortexes. The active blowing control device is simple in structure, the alternately generated vortexes in the tail flow can be broken, and the formation of tail flow vortexes can be prevented; and meanwhile, a flow field on a cylindrical surface is changed, so that the aerodynamic force on the surface of the cylindrical structure is reduced to a certain degree, and the wind-induced vibration of the cylindrical structure can be well reduced.

The invention discloses a self-air-sucking and self-air-blowing vibration damping device for controlling wind-induced vibration of a stay cable. The self-air-sucking and self-air-blowing vibration damping device for controlling wind-induced vibration of the stay cable comprises multiple round hollow lantern rings, wherein the multiple round hollow lantern rings are fixed to the stay cable at certain intervals, multiple air inlets are formed in the windward side of each round hollow lantern ring, and multiple air outlets are formed in the leeward side of each round hollow lantern ring. Or the self-air-sucking and self-air-blowing vibration damping device for controlling wind-induced vibration of the stay cable comprises a spiral hollow lantern ring, wherein the spiral hollow lantern ring is wound around the stay cable in a fastened mode, multiple air inlets are formed in the windward side of the spiral hollow lantern ring, and multiple air outlets are formed in the leeward side of the spiral hollow lantern ring. According to the self-air-sucking and self-air-blowing vibration damping device for controlling wind-induced vibration of the stay cable, the pulsating pressure on the surface of the stay cable is greatly reduced, and the lift force of the surface of the stay cable is greatly reduced. Due to the fact that wake flow can not form vortexes which fall alternately, the width of the wake flow is reduced to a certain degree, and the resistance of the surface of the stay cable is reduced to a certain degree. The shape of the surface of the stay cable is changed, waterlines can be prevented from being formed on the surface of the stay cable to a certain degree, and wind-induced vibration of the stay cable is prevented.

The invention discloses a pulsating pressure attenuating device for a low frequency and a performance testing method thereof. The attenuating device mainly comprises a pipe joint (1), a casing (2), anO-type sealing ring (3), a gland (4), elastic sheets (5) and a hexagon socket bolt. The casing is formed of a stainless steel sheet by welding and surrounds to form a main cavity (8). The gland (4) respectively surrounds to form a static pressure balance chamber (6) with the elastic sheets (5) having different diameters, and the main cavity and the static pressure balance chamber are connected through a static pressure balance hole. When a direct drive pump is operated according to the rated frequency, the pulsating pressure in the main cavity interacts with the elastic sheets. Since the fundamental frequency to the fourth harmonic frequency of the pressure pulsation is the same as the first order natural frequency of each elastic sheet, the sheets resonate and the purpose of attenuatingpulsating pressure is achieved.

The invention discloses a bionic noise-reducing air conditioner grid. Sawtooth structures are arranged on the front edge and the rear edge of the bionic noise-reducing air conditioner grid, sawtooth unit bodies of the sawtooth structures are evenly distributed on the edges of the bionic noise-reducing air conditioner grid, and the sawtooth unit bodies are symmetrically distributed on the front edge and the rear edge of the bionic noise-reducing air conditioner grid. The sawtooth structures are triangular sawtooth structures or spline-shaped sawtooth structures or semi-oval sawtooth structures or semi-circular sawtooth structures. The sawtooth structures on the front edge and the rear edge of the bionic noise-reducing air conditioner grid can prevent vortexes on the tail portion of the bionic noise-reducing air conditioner grid from falling off, pulsating pressure produced by unsteady-state airflow on the surface of the bionic noise-reducing air conditioner grid can be reduced, air power noise produced by the bionic noise-reducing air conditioner grid through the airflow can be reduced, and interference of the noise on working and the living environment can be reduced.