32results about How to "Reduce fluid noise" patented technology

In an axial flow fan, for reducing fluid noise and further reducing the noise by suppressing solid-conveyed noise (structure-bone noise) generated by the vibration of an electric motor or the like, the axial flow fan is equipped with a propeller, a motor for driving the propeller, and a venturi portion disposed on the outer circumference side of the propeller and provided on its inner circumferential side with a bellmouth through which an air flow generated by the revolution of the propeller passes, wherein the bellmouth has an intake portion whose diameter contracts in a curved shape in the direction of the air flow, a cylindrical portion having a cylindrical shape, and a discharge portion whose diameter slantingly expands in the direction of the air flow.

The invention relates to a submarine with internal and external water reducing resistance to internally form efficient and energy-saving power impelling, in particular to a submarine capable of automatically generating electrical power for persistently sailing. Conventional submarine sailings have rudder resistance and the fluid resistance and the noise of surface orifices, and ballast water occupies the load during sailing; the power of a propeller pays out energy consumption for loading the water weight and various resistance factors, and partial power is lost and wasted; and the bearing capacity of a commonly known diesel-electricity storage energy source is limit, the power is limit, and the endurance of sailing oceanic energy sources is limit. The innovative impelling mechanism adopts the scheme that the submarine is provided with a relevant guide rudder and has no resistance; the orifices are inwards arranged for collective and distributive drainage; the ballast water is converted and reduced for light sailings; bundling untangling is water jet propulsion; the power loss is reduced, and the impelling efficiency is increased; the submarine impelling mechanism has the multiple dual-purpose effect of water, the storage electricity source impels to promote the resistance, and water resources circularly act on a generating system and an electrical system; a distribution system is switched, and the generating system is operated to output electric energy so as to promote to generate energy and supply for the endurance; the energy replacing and saving are finished, and the emission is reduced; and the submarine is beneficial to the ecological protection and suitable for oceanic strategies and embodies full energy storage innovative and characteristic oceanic sailings.

A modal attenuator may include an attenuator body having a lead-in segment and a lead-out segment joined by a connection segment, a perforated screen disposed within the attenuator body and spaced apart from the attenuator body to form an annular space, and a plurality of rings disposed between the perforated screen and the attenuator body. When fluid flows through the modal attenuator, sound waves pass through the perforated screen and are reflected back by the plurality of rings to disrupt other sound waves, thereby reducing fluid noise in the modal attenuator.

A swing rotor compressor comprises a swing rotor, an eccentric axle, a front end cover, an air cylinder, a guide rail and a back end cover, wherein the swing rotor comprises a rolling ring and a swing rod; the eccentric axle comprises a spindle and an eccentric wheel; an exhaust hole is formed in the rolling ring and is close to one side of the swing rod; an exhaust cavity is formed in the eccentric wheel and is connected with or disconnected from the exhaust hole in the rolling ring periodically during rotation of the spindle; a flow passing hole is formed in the back end cover, and the exhaust cavity is always communicated with the flow passing hole in the back end cover during rotation of the spindle. No suction valve and exhaust valve are arranged, and compared with a traditional swing rotor compressor, the swing rotor compressor is higher in efficiency, lower in noise and better in speed change characteristic and durability.

The invention discloses an optimized design method for a valve plate of an axial piston pump. The method is characterized by comprising the following steps that S1, the over-flow area of a valve plateof a swash plate axial piston pump is calculated; S2, the flow of the axial piston pump is calculated; S3, the leakage flow is calculated; S4, a theoretical model of the single piston pump is established; S5, an over-flow area curve of a triangular unloading groove, an over-flow area curve of a damping hole and an over-flow area change curve of a waist-shaped hole are respectively drawn through software according to the calculation of the S1; and S6, a flow pulsation curve of the single piston is obtained according to analysis of the over-flow area. The method has the following beneficial effect that taking the valve plate of the 112D swash plate axial piston pump as an example, the flow pulsation condition of the unloading groove on the valve plate is analyzed and the flow pulsation curves in various forms are obtained, and finally the optimal size of the valve plate is obtained under the condition that pulsation is reduced, so that the valve plate is optimized and designed, and thefluid noise generated when the high-pressure axial piston pump works can be further reduced.

A fan guard which reduces fluid noise while holding the conventional function for blocking intrusion of a hand of a person or a foreign matter. In a fan guard (200) constituted of a plurality of crosspieces (110) and arranged at an outlet (6) of an engine driven heat pump (1) having a fan (5), the crosspieces (110) are formed by continuing unit shapes (110a) bending or curving relative to the reference line (S) for constituting the crosspieces (110) on the fan guard (200). The unit shape (110a) is formed to have a wavy shape, for example.

The invention discloses a refrigerator and an air duct plate of the refrigerator. The refrigerator comprises a refrigerator body which is internally provided with refrigerating chambers, door bodies installed on the refrigerator body and used for opening or closing the refrigerating chambers and an air duct arranged in the refrigerator body, wherein the air duct comprises the air duct plate, and silencing blind holes spaced to one another are formed in the inner wall face of the air duct plate. According to the refrigerator, due to the fact that the silencing blind holes are formed in the inner wall face of the air duct plate, noise can form resonance at peak frequency bands, so that the silencing coefficient and the sound resistance of the air duct plate are improved, and the sound absorption bandwidth is enlarged. In addition, the silencing blind holes formed in the inner wall face of the air duct plate are used for replacing silencing cotton to reduce fluid noise generated when air flow flows through the air duct plate, secondary noise brought by the silencing cotton is lowered, the problem that the air duct is blocked by ice due to water absorption of sound absorption cotton is effectively solved, the production cost is reduced, and the long-term operation reliability of the product is improved.

The invention relates to rotating compressor upper bearing. It includes bearing seat, axle sleeve, air outlet valve plate, and position limiting machine. The air outlet valve plate forms truncated cone which can ensure compressor efficiency, use diminishing aperture to reduce fluid noise while discharging secondary refrigerant, thereby increase product performance and quality.

The exhaust structure of a rotary vane type compressor comprises a cylinder, an accessory bearing plate, exhausts, and an inserter, with the said accessory bearing plate set under the cylinder that has a ring space, and the said exhausts go through the accessory bearing plate respectively to connect with the ring space, forming steps at its side of the interior, the said inserter inserting to the step respectively through the interior of corresponding exhausts to avoid the gas cold media vertex caused by the step. It can not only prevent the occurrence of dead end for the flow of the cold media under the step of the exhaust, but also avoid the production of vortex of the compressed gas cold media and therefore counter back the recirculation area of the gas cold media on the step and the pressure loss due to inflation of the gas cold media and meanwhile significantly reducing the fluid noise resulted and vortices.

The invention discloses a thrust plate of an axial plunger pump. The thrust plate is provided with a kidney-shaped hole, wherein the kidney-shaped hole is located in the middle of the thrust plate, along hole is formed in the circumferential direction of the concentric circle of the thrust plate, and an unloading groove and a damping hole of the same structure are formed in the upper end of the kidney-shaped blind hole; and the damping hole is composed of a primary hole, a secondary hole and a tertiary hole which are concentric and sequentially reduced in diameter, wherein the back surface ofthe side of the unloading groove is sequentially provided with the primary hole, the secondary hole and the tertiary hole, the tertiary hole communicates with the outermost side of the unloading groove, and the width angle of the unloading groove is 83.5 degrees. The thrust plate has the beneficial effects that the flow pulsation condition of the unloading groove on the thrust plate is analyzed and various forms of flow pulsation curves are obtained by taking a thrust plate of a 112D swash plate type axial plunger pump as an example, and finally the optimal size of the thrust plate is obtained from the reduction of pulsation, so that the thrust plate is optimized and designed, and the fluid noise generated when the high-pressure axial plunger pump works is further reduced.

The invention belongs to the technical field of silencing and in particular discloses a frequency dividing combined pressure fluctuation attenuation device and method. The device comprises a body, anenergy accumulator and an attenuator, wherein the body is of a hollow structure and is taken as a conveying channel of a to-be-attenuated fluid; the energy accumulator is arranged on the body and is connected to the conveying channel; the attenuator is arranged around the energy accumulator and is also connected to the conveying channel. Therefore, pressure fluctuation of the fluid is attenuated as the energy accumulator and the attenuator are matched. The device can reduce fluid noise and pipeline vibration effectively and is suitable for multi-stage frequency attenuation of pressure fluctuation of various fluids such as water, hydraulic oil and gas.

The invention provides a gas flow-splitting / converging device with a noise eliminating function used for a compressor unit refrigerating system. The gas flow-splitting / converging device comprises an outer wall shell, an air inlet / an air outlet, at least two air outlets / air inlets and a flow-splitting unit, wherein the flow-splitting unit is provided with an internal flow channel the inner wall of which is smooth. The gas flow-splitting / converging device is characterized by further comprising a noise elimination unit, wherein the noise eliminating unit and the internal flow channel as well as the outer wall shell form an integral type structure. The gas flow-splitting / converging device with the noise eliminating function can be simultaneously or independently applied in the compressor unit refrigerating system. A gas flow-splitting device with the noise eliminating function is mounted between a compressor and a condenser; and a gas flow-converging device with the noise eliminating function is mounted between the compressor and the evaporator. With the adoption of the gas flow-splitting / converging device, the function of the noise eliminating unit can be effectively utilized, fluid noise of the compressor unit refrigerating system can be attenuated to the greatest extent, and meanwhile, the structural arrangement of a pipeline of the compressor unit can be simplified, and no obvious additional pressure drop is generated.

The invention discloses a low noise rudder blade surface structure for a warship. The low noise rudder blade surface structure for the warship comprises common elastic wing panels, an elastic bow wing panel and an elastic stern wing panel, wherein the common elastic wing panels are fixedly connected with a rudder blade shell plate by virtue of mounting screws, the elastic bow wing panel is fixedly connected with the rudder blade shell plate by virtue of mounting screws, and the elastic stern wing panel is fixedly connected with the rudder blade shell plate by virtue of mounting screws; and the common elastic wing panels are connected with the elastic stern wing panel in an overlapping and leaning manner, the common elastic wing panels are mutually connected in an overlapping and leaning manner, and the elastic bow wing panel and the common elastic wing panels are connected in an overlapping and leaning manner. The low noise rudder blade surface structure for the warship has the advantages that one group of detachable elastic wing panels which are mutually matched are mounted on a rudder blade, so that the rudder blade surface structure has certain elasticity, the drastic change of water pressure, caused by turbulent flow or eddy, of a rudder blade surface is relieved, and the water flow field of the rudder blade surface is improved by virtue of surface grooves of the elastic wing panels, so that anti-cavitation and eddy reducing properties of the whole rudder blade are improved, and the fluid noise of the rudder blade is reduced.

The invention discloses a refrigerator which comprises a cabinet, a door body, an air passage and a fan, wherein a refrigeration compartment is arranged in the cabinet; the door body is arranged on the cabinet and used for opening or closing the refrigeration compartment; the air passage is arranged in the cabinet; the air passage comprises an air passage plate, a plurality groups of air holes which are mutually spaced are formed in the side wall of the air passage plate; the air holes are communicated with the refrigeration compartment; the fan is arranged in the air passage; the center axis of the fan is vertical to the air passage plate; the air holes of the air passage plate are formed far away the fan. According to the refrigerator disclosed by the invention, the air holes are formed at a position far away from the refrigerator, namely the air holes are formed at a position far away from a noise source, so that noise transmission is effectively controlled; the interference between the air holes and the fan is reduced, consequently secondary noises are reduced, the fluid noise in the refrigerator is reduced, and the quality of the refrigerator is improved.

The invention discloses a surface cleaning head comprising a housing; the housing comprises a dust collection chamber, a brush roller, a front guide roller and one or more rear support wheels; the dust collection chamber is provided with an opening in the lower side of the housing; the brush roller is rotatably mounted in the dust collection chamber and at least a portion is close to the opening;the front roller is rotatably mounted on the housing, located in front of the brush roller and the opening and spaced apart from the brush roller, and the one or more rear support wheels are disposedbehind the housing and spaced apart from the brush roller; an inter-roller air passage is defined between the lower portion of the brush roller and the front guide roller, the outer diameter of the front guide roller is smaller than the outer diameter of the brush roller, the position of the lower bottom surface of the front guide roller is lower than the position of the lower bottom surface of the brush roller, and the outer diameter of the rear support wheel is larger than the outer diameter of the brush roller. The surface cleaning head in the invention integrally presents the form of low front and high rear, thereby facilitating ground operation of the surface cleaning head; the surface cleaning head has a good cleaning effect on corners with vertical surfaces as well as spaces such asfurniture and / or cabinets with low gaps, and no cleaning dead angles are left; and the surface cleaning head also has good ground operation performance.

The invention discloses a rotary compressor and a rotor assembly thereof. The rotor assembly includes: a rotor with a shaft hole; an upper balance weight and a lower balance weight respectively arranged on the top and bottom of the rotor, and the upper balance weight and the lower balance weight respectively have shaft holes coaxial with the shaft hole; The first circular hole and the second circular hole, wherein each of the upper balance weight and the lower balance weight includes: an outer cylinder; an inner cylinder, the inner cylinder intersects the outer cylinder and is connected to the outer cylinder The protruding direction is opposite; the upper end surface, the upper end surface is set on the top of the outer cylinder and the inner cylinder; the lower end surface, the lower end surface is set on the bottom of the outer cylinder and the inner cylinder. According to the rotor assembly of the present invention, when used in a rotary compressor, it can reduce the rotational speed fluctuation of the rotary compressor to reduce vibration and noise, and effectively reduce the fluid noise inside the shell of the rotary compressor and improve its mechanical efficiency. Moreover, the production process is simple and the reliability is high.

The invention provides a refrigeration appliance which comprises a box and an air flue. A storage room is arranged in the box, the air flue is arranged in the box, and an air outlet of the air flue is communicated with the storage room; and the air flue is provided with a noise reduction cavity communicated with the air flue. The resistance borne by the air flue in the process of flowing in a second channel provided with the noise reduction cavity is small, and the air outlet amount of cold air entering a refrigerator room through the second channel within unit time is guaranteed. In this way, by means of the air flue structure, the original refrigeration performance of the refrigerator room is maintained, fluid noise is reduced to the maximum degree, and the two functions including refrigeration and noise reduction can be considered.

The invention provides a low-noise adjusting valve with a pre-starting structure. The low-noise adjusting valve with the pre-starting structure comprises a three-way valve body, an upper cover plate, a valve rod, a pre-starting plunger, a pre-starting valve seat, a valve head and a large-flow throttling element, wherein a pressing piece is mounted in the center of the upper cover plate; an end of the valve rod is fixedly connected with the upper end of the pre-starting plunger; the lower end of the valve head is clamped at the bottom of the three-way valve body; the middle of the valve head is fixedly connected with a baffle; the pre-starting valve seat is fixedly mounted at the bottom end of the valve head; the baffle and the pre-starting valve seat are positioned in the valve head; a narrow slit flow channel is further formed in the valve head; a pressure spring sleeves the valve rod; one end of the pressure spring is fixedly connected with the pressing piece while the other end of the pressure spring is fixedly connected with the baffle; at least one annular groove is formed in the lower end of the pre-starting plunger; at least one annular projection is arranged at the upper end of the pre-starting valve seat; and after each annular groove is matched with the corresponding annular projection, a labyrinth type pre-starting structure is formed. The initial lifting force of the valve can be reduced effectively, fluid noises under the condition of small opening are reduced, turbulent flow collision is relieved, and flow capacity under the condition of large opening is improved.

The invention provides a motor stator, a motor, a compressor and refrigeration equipment, the motor stator comprises a stator body and a sound absorption device, the stator body comprises a yoke part and a plurality of tooth parts, the yoke part is provided with a first end face and a second end face which are opposite, the plurality of tooth parts are arranged at intervals along the circumferential direction of the inner side wall of the yoke part, and the first end face and the second end face are opposite to each other. Stator grooves are arranged between adjacent tooth parts, and the outer side wall of the yoke part is provided with trimming grooves penetrating through the first end face and the second end face. The sound absorption device comprises a sound absorption plate, and a plurality of sound absorption holes are formed in the sound absorption plate; the sound absorption plate is arranged on the first end face of the yoke part, and / or the second end face of the yoke part, and / or in at least one trimming groove, and a cavity communicated with the sound absorption hole is reserved between the sound absorption plate and the corresponding mounting face on the yoke part. According to the motor stator, the motor, the compressor and the refrigeration equipment, fluid noise generated when a refrigerant flows through the motor can be effectively reduced, and the noise reduction effect is improved.

The invention relates to a fairing and a pressure reducing valve. The fairing comprises a conical fairing body, wherein the outer side wall of the fairing body is a conical surface with the diameter being large in the upper part and small in the lower part; the outer side wall of the fairing body is a curved surface protruding outwards; multiple splitter plates are connected onto the outer side wall of the fairing body, and are arranged in the circumferential direction of the fairing body at intervals; the multiple splitter plates are all perpendicular to the circumferential direction of the fairing body; and the fairing is arranged in the pressure reducing valve. According to the fairing and the pressure reducing valve provided by the invention, noise generated in the operation process ofthe pressure reducing valve can be reduced.

The invention relates to an electric valve comprising a valve element, a valve body assembly and a first flow guide part, the valve body assembly is provided with a first channel and a second channel, the valve element is provided with a hole channel, the first flow guide part comprises a first inclined section and a straight section, the first inclined section is closer to the valve element than the straight section, and the first flow guide part forms a first flow guide cavity which is communicated with the first channel; the first flow guide cavity is closer to the valve element than the first channel, and the hole channel can communicate with the first channel and the second channel through the first flow guide cavity, so that when the valve element moves to enable fluid to be throttled at a small opening degree and the fluid flows in from the second channel, the fluid flows from the second channel to the first flow guide cavity after passing through the hole channel; the fluid flows out of the first channel after being guided by the first guide cavity, so that the possibility that the fluid forms vortex in the first channel is reduced, and the fluid noise generated when the electrically operated valve works is reduced.

The invention discloses a semi-closed piston refrigeration compressor, which includes a shell, a wiring board, a valve plate, a crankshaft, a piston rod assembly, a motor, an ordinary-pressure inlet valve, a high-pressure outlet valve, a cylinder end cover, a compressor, and a cylinder body. A rotation axis of the motor is connected with the crankshaft, and the crankshaft is correspondingly installed in the compressor after the compressor is connected with the right end of the motor. An eccentric shaft of the crankshaft is connected with the piston rod assembly, and the piston in the piston rod assembly is installed in the cylinder body with evenly distributed laser reticulate patterns in the pinhole in wall. The upper end of the cylinder body is provided with a closed cylinder end cover, and the outer end of the cylinder end cover is provided a plurality of vibration-elimination grooves. An air inlet of the compressor is provided with the ordinary-pressure inlet valve, and an air outlet is provided with the high-pressure outlet valve. The shell is installed in the outside of the motor, the wiring board is installed in the upper end of the shell, and the valve plate is installed in the upper end of the compressor. The vibration-elimination grooves of the cylinder end cover have the advantage that fluid noise is reduced, and the piston rod assembly with ultra-precise mirror technological processing, the crankshaft and the cylinder inner wall with the laser reticulate patterns have the advantages that friction coefficient is greatly reduced, wear resistance and balance are improved, and working efficiency and energy efficiency gasification are increased.

A fan guard which reduces fluid noise while holding the conventional function for blocking intrusion of a hand of a person or a foreign matter. In a fan guard (200) constituted of a plurality of crosspieces (110) and arranged at an outlet (6) of an engine driven heat pump (1) having a fan (5), the crosspieces (110) are formed by continuing unit shapes (110a) bending or curving relative to the reference line (S) for constituting the crosspieces (110) on the fan guard (200). The unit shape (110a) is formed to have a wavy shape, for example.