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

The invention discloses an automobile muffler. The automobile muffler is characterized by comprising a tubular shell body, an air inlet pipe, an exhaust pipe, a first separation plate and a second separation plate. The air inlet pipe and the exhaust pipe are arranged in the shell body. The first separation plate and the second separation plate are arranged in the shell body sequentially. The air inlet pipe penetrates through the left end shell body, the first separation plate and the second separation plate sequentially from left to right and is connected with the right end shell body. The exhaust pipe begins from a first cavity and penetrates through the first separation plate, the second separation plate and the right end shell body sequentially. The air inlet pipe is provided with through holes in a second cavity and a third cavity respectively. The right side of the first separation plate is provided with a first throttle orifice plate. The left side and the right side of the second separation plate are provided with a second throttle orifice plate and a third throttle orifice plate respectively. The first separation plate and the second separation plate are both provided with through hole. The automobile muffler has the beneficial effects of being reasonable in manufacturing process, low in manufacturing cost, and free of the influence on the normal operation, safe, reliable, capable of weakening noise better, and good in noise elimination effect.

A water-wring eliminating element is a quadrangular frustum pyramid structure, whose front end face and back end face are located on the same horizontal plane, wherein the height h1 of the front end face is 1-1.1 times of water depth on the tail of lock pier, and the width b1 is equal to the width of the lock pier, and the height h2 and the width b2 of the back end face are decided by the type of an over-fall dam, the height h2 of the back end face is 0.5-0.6 times of the water depth on the end face position and the width b2 is the 1 / 7-1 / 6 of the width of the lock pier if the over-fall dam is a utility dam type, and the height h2 of the back end face is 1-1.1 times of the water depth on the end face installation position, and the width b2 is the 1 / 8-1-6 of the width of the lock pier if the over-fall dam is a broad-topped dam, and the distance d between the front end face and the back end face is 5-6 times of the width of the lock pier. The water-wring eliminating element is installed on the back of the lock pier in an over-fall tunnel or a river tunnel gate dam, which can eliminate the water-wring phenomenon on the back of the over-fall tunnel or the river tunnel gate dam, and improves the water flow state in the over-fall tunnel or the river tunnel.

A combined load shedding type sound barrier for a high speed railway comprises an H-shaped column, upper unit plates and lower unit plates. The upper unit plates and the lower unit plates are inserted in the H-shaped column. The sound barrier is characterized in that the lower unit plates comprise a plurality of inclined inclining plates fixed on a vertical frame in an embedding mode at intervals, and a groove is formed in the middle of a cavity between opposite faces of any two inclining plates to form a silencing cavity with larger space. The upper end and the lower end of the vertical frame are connected with an upper frame and a lower frame to form a fixed frame. The fixed frame is inserted into the lower portion of the H-shaped column. The outer side of the upper frame is connected with a parabola-shaped skirt plate with an opening facing downwards, the lower portion of the skirt plate is connected with the lower frame through a plurality of transverse rods, and a sound absorbing material is bonded to the inner side of the skirt plate. Pulsating pressure exerted on the sound barrier can be reduced, service life of the sound barrier can be prolonged, and a good noise reducing effect is achieved.

The invention discloses a sound barrier for a rail traffic road. The problems that in the prior art, an existing sound barrier cannot dislodge the train starting load acting on the surface of the existing sound barrier, thus the service life of the sound barrier is shortened, and the energy-saving lighting demand of a train at night cannot be met are mainly solved. The sound barrier for the rail traffic road comprises a plurality of sequentially-connected sound barrier units, and the sound barrier units comprise outer shells with front face plates and rear face plates. Honeycomb cores are arranged between the front face plates and the rear face plates, and sound insulation plates and sound absorption plates are arranged on the positions, between the honeycomb cores and the rear face plates, of the inner tops and the inner bottoms of the outer shells correspondingly and form continuous M-shaped or W-shaped channels. The channels are filled with sound absorption materials. Through the scheme, the purposes of prolonging of the sound barrier service life and energy conservation are achieved, and the very high practical value and promotional value are achieved.

The invention provides a composite tail pier for removing water wings. The composite tail pier is composed of a waterproof pier body located on the upper portion and a flow supporting pier seat located on the lower portion; and the waterproof pier body and the flow supporting pier seat are of an integrated structure. The waterproof pier body is a pentahedron composed of a first rear end face, a first left side face, a first right side face, a first top face and a first bottom face; the flow supporting pier seat is a curve body composed of a second front end face, a second rear end face, a second left side face, a second right side face, a second top face and a second bottom face; and the second top face and the first bottom face are located on the same face, and the face is a combination face of the flow supporting pier seat and the waterproof pier body. The composite tail pier can effectively remove the water wing phenomenon at the position behind a gate pier, the flow state inside a spillway or a tunnel spillway or a downstream river channel can be improved, and the safety of running of a release structure is improved.

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 method for monitoring wear particles on line by virtue of filtration, electromagnetic centrifugation and adjacent capacitance. The wear particles are monitored on line sequentially through a filter, a temperature control module, a magnetization module, a cyclone centrifugation module, a rotating magnetic field centrifugation module, an adsorption module, an adjacent capacitance particle monitoring module and a demagnetization module, wherein an oil inlet is formed in one end of the filter; an oil outlet is formed in one end of the demagnetization module. According to the method, a capacitance edge effect-based adjacent capacitance sensor technology is introduced to implement nonintrusive and unconstrained monitoring of the wear particles; the wear particles in oil are magnetized and aggregated into large particles through the magnetization, cyclone centrifugation and rotating magnetic field centrifugation modules, move to the vicinity of tube walls and are adsorbed by the adsorption module, so that the output monitoring signal strength of an adjacent capacitance sensor is improved; by the temperature control module and a reasonably designed adjacent capacitance sensor plate layer structure, noise is suppressed, and the overall performance of an adjacent capacitance sensor monitoring device is optimized.

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.