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

The invention discloses a bionic resistance-reducing noise-reducing surface of a rigid and flexible structure. The bionic resistance-reducing noise-reducing surface of the rigid and flexible structure is formed by alternatively distributing rigid ribs and flexible strips on a rigid surface, the section of each rigid rib is semicircular or triangular or semielliptical or the like, each rigid rib is higher than each flexible strip by 0.2-5mm, the interval between the rigid ribs is 1-15mm, and the thickness of each flexible strip is 0.5-4mm. Middle grooves formed by the rigid ribs on the rigid surface can limit the extensible motion of a streamwise vortex, bursting intensity of turbulence on a wall surface is lowered, and frictional resistance of the wall surface is lowered. A flexible strip wall surface between every two rigid ribs can reduce pulse pressure generated by the turbulence on the wall surface, the frequency of falling of the vortex on the wall surface is suppressed, frictional resistance is further reduced, and flowing noise is reduced.

The present invention relates to a variable capacity swash plate type compressor, in which a check valve for circulating refrigerant inside a compressor and preventing a backflow of the refrigerant when an air conditioner is turned off is mounted on a side of a discharge muffler chamber in a cover type so that the discharge muffler chamber is formed by the check valve, thereby reducing the number of components, the number of work processes, and a pulsating pressure (pulsating noise) of discharged refrigerant, allowing that the check valve is mounted at the center of a discharge chamber without any increase in size of the compressor, preventing an overlapping phenomenon of a pulsating pressure waveform of a high-pressure refrigerant at the time of discharge since the check valve is located at the center of the discharge chamber, and preventing a separation of the check valve by fixing the check valve in the discharge chamber via a retainer.

The invention discloses a noise reducing device of scroll compressor, comprising a sealed casing, a static scroll disk fixed in the sealed casing, a dynamic scroll disk fixed on the driving shaft, an outlet cover fixed on the static scroll disk and forming an out let chamber, and a high-low pressure dividing plate which divides the sealed casing into suction area and outlet area. The invention is characterized in that: on the outlet cover, multiple small through holes are formed, the compressed gas from the compressing chamber can be outlet by the small through holes. In this way, the outlet path of the compressed gas is dispersed. The invention can reduce the pulsating pressure of the compressed gas, and consequently reduced the noise from the compressor.

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 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.

The present invention relates to a compressor that can reduce the refrigerant gas pulsation pressure in multi-step when a refrigerant gas is discharged into a rear refrigerant gas discharge chamber toward the outside of the compressor and into a front refrigerant gas discharge chamber toward the outside of the compressor, thereby obtaining excellent reduction in the refrigerant gas pulsation pressure and remarkably reducing a noise due to the refrigerant gas pulsation.

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 an automobile muffler, which comprises a shell, an air inlet pipe and an air outlet pipe, wherein the internal space of the shell is partitioned into a first cavity, a second cavity and a third cavity along an air inlet direction through a front perforated separation disc and a back perforated separation disc; the air inlet pipe and the air outlet pipe are arranged on the shell; the back separation disc is used for enclosing the inner end of the air inlet pipe; the pipe walls of the air inlet pipe in the first cavity and the second cavity are respectively distributed with a plurality of through holes; a part of the air outlet pipe in the shell is formed by connecting an air outlet section part which passes through the third cavity and the second cavity in sequence from the air outlet, a U-shaped pipe section part in the first cavity, and an air inlet section part passing through the second cavity; a plurality of muffling through holes are distributed in the pipe wall of the air outlet section of the air outlet pipe in the second cavity, and a jacket for enclosing the muffling through holes is arranged outside the pipe wall; and muffling cotton is arranged between the air outlet pipe and the jacket. Compared with the prior art, the automobile muffler has the advantages that the high and low-frequency noise is better attenuated, and the total noise is lowered by 2 decibels, from 73 decibels to 71 decibels.

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 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 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 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 relates to a wear particle monitoring device using hydraulic filtering, centrifugal separation and adjacent capacitors, including a filter, a temperature control module, a magnetization module, a mechanical centrifugal module, a rotating magnetic field centrifugal module, an adsorption module, and an adjacent capacitor particle monitoring module It is connected with the degaussing module in turn; the filter adopts a variable structure working condition adaptive filter, and one end of it is provided with an oil inlet; one end of the degaussing module is provided with an oil outlet. The invention introduces adjacent capacitive sensor technology based on capacitive edge effect to realize non-invasive and unconstrained monitoring of wear particles; through magnetization, mechanical centrifugation and rotating magnetic field centrifugal module, the wear particles in the oil are magnetized, aggregated into large particles and moved to Near the pipe wall and adsorbed by the adsorption module to improve the output monitoring signal strength of the adjacent capacitive sensor; through the temperature control module and the reasonable design of the plate layer structure of the adjacent capacitive sensor, the noise is suppressed and the overall monitoring device of the adjacent capacitive sensor is optimized performance.

The invention discloses a car muffler. The car muffler is characterized by comprising a tubular shell, an air inlet tube, an exhaust tube, a first partition plate and a second partition plate, wherein the air inlet tube and the exhaust tube are arranged in the shell, and the first partition plate and the second partition plate are sequentially arranged in the shell; the air inlet tube and the exhaust tube sequentially penetrate the first partition plate and the second partition plate; the positions, in a second chamber and a third chamber, of the air inlet tube are each provided with through holes; a first restriction orifice is arranged on the right side of the first partition plate; a second restriction orifice is arranged on the left side of the second partition plate, and a third restriction orifice is arranged on the right side of the second partition plate; and the first partition plate and the second partition plate are each provided with a through hole. The car muffler has the beneficial effects that the car muffler is reasonable in manufacturing process and low in manufacturing cost; normal operation cannot be influenced, and safety and reliability are achieved; and the car muffler can better attenuate noise and is good in noise elimination effect.

The invention relates to abrasion particle monitoring equipment using filter waves, electromagnetic centrifugation and adjacent capacitances. A filter, a temperature control module, a magnetization module, a mechanical centrifugal module, a rotating magnetic field centrifugal module, an adsorption module, an adjacent capacitance particle monitoring module and a demagnetization module of the abrasion particle monitoring equipment are sequentially connected. An oil liquid inlet is formed in one end of the filter. An oil liquid outlet is formed in one end of the demagnetization module. According to the abrasion particle monitoring equipment using the filter waves, electromagnetic centrifugation and the adjacent capacitances, the adjacent capacitance sensor technology based on the capacitance edge effect is introduced, and abrasion particle non-intrusive and unconstrained monitoring is achieved; abrasion particles in oil liquid are magnetized and aggregated into large particles through the magnetization module, the mechanical centrifugal module and the rotating magnetic field centrifugal module and move to the position near a pipe wall to be adsorbed by the adsorption module so that the output monitoring signal strength of an adjacent capacitance sensor can be improved; and through the temperature control module and reasonable design of the polar plate layer structure of the adjacent capacitance sensor, noise is suppressed, and the overall performance of an adjacent capacitance sensor monitoring device is optimized.

The invention discloses a pulse sound attenuation device for a screw rod type refrigerating machine. The pulse sound attenuation device for the screw rod type refrigerating machine comprises a hollow cylindrical sound attenuation cylinder body, and the two ends of the sound attenuation cylinder body are each provided with an annular connecting clamping ring; an annular positioning clamping ring is arranged on the outer wall of the sound attenuation cylinder body; and a sound attenuation tile strip array composed of C-shaped sound attenuation tile strips is circumferentially arranged on the inner wall of the sound attenuation cylinder body. The pulse sound attenuation device for the screw rod type refrigerating machine has the advantages that in the use process, a user enables the connecting clamping rings to be connected with an exhaust opening of a compressor of the refrigerating machine, when pulse exhaust of the screw rod compressor passes through the sound attenuation cylinder body, due to the flow guide effect of the sound attenuation tile strips, the exhaust pulse pressure of the compressor is greatly reduced, and therefore the exhaust noise of the screw rod compressor is greatly reduced, and the performance of the screw rod type refrigerating machine is effectively improved.

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 vortex generator for a propeller type ship and the ship, a first incident flow face is additionally arranged, the first incident flow face is perpendicular to the bottom face, additional vortexes can be generated, the additional vortexes and main vortexes are overlapped, and mixed vortexes with the increased wake and the enhanced energy are obtained. When the mixed vortex is transmitted to a stern flow lagging area, flow separation can be restrained, generation of an excessive low-pressure area can be restrained, the variation gradient of wake flow at propeller blades is reduced, cavitation bubbles at the position are enabled to develop stably, pulsating pressure generated by the cavitation bubbles is reduced, and therefore the damping effect is achieved, and the sailing resistance is 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.