30results about How to "Avoid mechanical noise" patented technology

This invention discloses a converter test circuit. The test converter work in the inverter of 'DC - single-phase AC or three-phase AC'. That is to transform DC into single-phase or three-phase AC, the testes converter DC-DC is connected to power supply, and there is a the DC power supply is a energy storage capacitor between the negative and positive, the AC end is connected to high inductive load. In test, described high inductive load through the pulse width modulation control of the converter, achieve the energy cycle between energy storage capacitor through reactive power. Adopt the test circuit, as long as the appropriate control of the converter can achieve converter work with the actual work in the same current and power conditions to get equal effective test data of existing technology, but the actual energy loss was very small.

The invention provides a centrifugal compressor. The centrifugal compressor comprises a motor, a first compressor and a second compressor, wherein the motor comprises a cylinder body, a first output end and a second output end; the cylinder body is provided with a first end and a second end which are oppositely arranged; the first output end and the second output end are respectively arranged at the first end and the second end; the first compressor is arranged at the first output end of the motor; the second compressor is arranged at the second output end of the motor; and an outlet of the first compressor is communicated with an inlet of the second compressor. The centrifugal compressor directly drives impellers of the first compressor and the second compressor to rotate at high speed, so that a gear speed-increasing structure is eliminated, the centrifugal compressor has the characteristics of small size and light weight, meanwhile, mechanical loss and noise caused in a driving process of the gear speed-increasing structure are also avoided, a sound isolating device for reducing the noise can also be eliminated, and the cost is reduced.

The invention discloses a netted electronic drum, including a drum disc, a drum skin, a data collection module and a data processing module. The data collection module comprises a trigger and a conduction medium. The conduction medium is a magnetic part. The magnetic part is arranged on the drum skin. The trigger comprises a Hall sensor in non-contact coupling with the magnetic part. The netted electronic drum is advantaged in that the trigger and the conduction medium is not directly contacted, the phenomenon of contact failure is avoided, and the accurate audio signal can be generated.

The invention relates to the field of integrated suspended ceilings, in particular to a suspended ceiling with a vibration damping device. The suspended ceiling with the vibration damping device comprises a keel, a mainframe and a buckling plate, wherein the buckling plate is arranged below the keel, the keel comprises a main keel and a triangular keel, and the suspended ceiling is characterized in that the vibration damping device is arranged between the mainframe and the keel, and the vibration damping device is arranged on the main keel or the triangular keel. The invention provides the suspended ceiling with the vibration damping device, which has simple structure, good vibration damping effect and convenience in mounting.

The invention relating to the field of electrical equipment provides a generator for electrical control. The generator comprises a base, and a roller mounting frame is fixedly connected to the left side of the bottom of the base; a roller body is mounted on the roller mounting frame; a fixing mechanism is mounted on the left side of the bottom of the base; side supporting frames are fixedly connected to the two sides of the top of the base; a generator body is arranged between the side supporting frames; cooling fins are installed at the top of the generator body; a top supporting frame is arranged on the upper side of the generator body; and a plurality of cooling fans are installed at the top of the top supporting frame. According to the generator for electrical control, after upward lifting of a push handle, a brake pad on the fixing mechanism leaves the ground, so that the equipment can be conveniently carried, the carrying is very easy and labor-saving, and the carrying efficiencyis high; the generator can be conveniently fixed and convenient to fix only by putting down the push handle when the generator does not need to be moved, and the generator is more convenient to use and high in practicability.

A rain hat device for heavy construction equipment which is installed adjacent to an exhaust gas discharging port of a distal end portion of an exhaust pipe to prevent inflow of rainwater therein is disclosed. The rain hat device comprises a swing cover installed at a distal end portion of the exhaust pipe in a spaced and floated state so as to prevent rainwater from flowing in the distal end portion of the exhaust pipe, and in which the swing cover does not come into contact with the distal end portion of the exhaust pipe to prevent noise from being generated due to contact and collision when an engine stops or exhaust gas is not discharged.

The invention discloses a method for testing the skip change of a worm wheel and worm fit friction coefficient of an automobile steering system. The method comprises the steps of (1) arranging a worm wheel assembly on a worm wheel fixing device in a rotatable manner, arranging a worm assembly on a worm fixing device in a rotatable manner, and meshing the worm assembly with the worm wheel assembly; (2) applying pressure F on the worm assembly to rotate the worm assembly; (3) measuring a rotating torque T of the worm assembly; (4) calculating the worm wheel and worm fit friction coefficient; (5) drawing a skip change curve graph of the worm wheel and worm fit friction coefficient. A conventional friction coefficient test method is applied to testing the skip change of a friction pair of worm wheel and worm fit of a speed reducing mechanism of a tubular column type electric steering system; the method is simple and practical and is low in cost; during design of an early speed reducing structure, problems can be found by the providing of the test method, so that mechanical noise generated by a worm wheel and a worm can be avoided in advance; therefore, the cost and the period for changing the design in the later stage can be reduced.

The invention relates to the field of compressors, and discloses a suction and exhaust device used for a compressor and the compressor. The suction and exhaust device comprises an air cylinder body (1) and an air suction valve sheet (2), a cylinder hole (11) is limited in the air cylinder body (1), the air suction valve sheet (2) is arranged on a cylinder face (12), located on one end of the cylinder hole (11), of the air cylinder body (1) in parallel, the air suction valve sheet (2) is provided with a tongue spring (21) capable of swinging towards the cylinder hole (11), the air suction and exhaust device comprises a limiting part (22) on the tongue spring (21) and a limiting groove (13) formed in the cylinder face (12), the limiting groove (13) is arranged to be matched with the limitingpart (22) to limit swing of the tongue spring (21) towards the cylinder hole (11), and a buffer pad or damping coating is arranged in the limiting groove. The air suction and exhaust device can effectively reduce the noise generated by the tongue spring of the air suction valve sheet in the air suction process.

The invention particularly discloses a sound insulation device. The sound insulation device comprises an upper base plate, a side base plate and a lower base plate. A sound insulation top plate is arranged on the inner side of the upper base plate, and a sound insulation side plate is arranged on the inner side of the side base plate. A sound insulation bottom plate is arranged on the inner side of the lower base plate. A sealed space is formed by the sound insulation top plate, the sound insulation side plate and the sound insulation bottom plate. A first keel is mounted on the outer side face of the sound insulation top plate. A first damping device is arranged between the first keel and the upper base plate. A second keel is mounted on the outer side face of the sound insulation side plate. A second damping device is arranged between the second keel and the side base plate. Damping bricks are arranged between the lower base plate and the sound insulation bottom plate. The sound insulation device is reasonable in design, good in sound insulation effect and capable of weakening the intensity of sound spreading along different media and different directions in an all-dimensional manner.

The invention discloses a flow control low-noise soft valve driven by electric conjugate liquid. Two fluid outlets of a valve body are respectively communicated with a fluid inlet through an upper flow channel and a lower flow channel, an electric conjugate liquid cavity is arranged between the upper flow channel and the lower flow channel, electric conjugate liquid is stored in the electric conjugate liquid cavity, a flexible cathode and upper and lower flexible anodes are arranged in the electric conjugate liquid cavity, and the electric conjugate liquid cavity is connected with the upper flow channel and the lower flow channel. At the joint of the electric conjugate liquid cavity and the upper flow channel, an upper flexible valve is hermetically mounted at a port of the electric conjugate liquid cavity, and an upper groove is formed in the side wall of the upper flow channel. At the joint of the electric conjugate liquid cavity and the lower flow channel, a lower flexible valve is hermetically mounted at a port of the electric conjugate liquid cavity, and a lower groove is formed in the side wall of the lower flow channel. According to the flow control soft valve, electric conjugate liquid static pressure is actively controlled through voltage so as to control throttling and on-off of a loop, the response speed is high, and the flow control soft valve is suitable for controlling a driving fluid loop in a soft robot.

The invention discloses a rehabilitation type in-vitro counter-pulsation device. The rehabilitation type in-vitro counter-pulsation device is characterized by adopting a novel electric shrinkage-relaxation mechanism, a remote control module and a supporting device, wherein the electric shrinkage-relaxation mechanism comprises a step motor, a rolling shaft, a storage cavity, a guide shaft, a limiting plate and a counter-pulsation belt, and is used for periodic extrusion and relaxation of a counter-pulsation part; the remote control module comprises an input signal interface, a data processing module, a single chip microcomputer, an auxiliary circuit and an output signal interface, and is used for generating a control signal according to the input signal through a counter-pulsation algorithmand outputting the control signal to the electric shrinkage-relaxation mechanism; and the supporting device is used for attitude adjustment of the electric shrinkage-relaxation mechanism. The devicesolves the problems of great size, high noise and poor comfort of a gasbag type counter-pulsation device, realizes distributed type counter-pulsation, can realize remote-control operation, and is suitable for rehabilitation of the ischemic cardio-vascular disease.

The invention provides a compressor assembly, an air conditioner and a control method. The compressor assembly comprises a compressor shell (9) and a gas-liquid separator (3), wherein the gas-liquid separator (3) communicates with external inlet gas and communicates with the interior of the compressor shell (9) through a first outlet pipe (32), a hybrid heat exchange cavity (5) is arranged outsidethe compressor shell (9) and can exchange heat with the compressor shell (9), and the hybrid heat exchange cavity (5) can be communicated with a first inlet pipe (31) through a second inlet pipe (6)and can be communicated with the gas-liquid separator (3) or a first outlet pipe (32) through a second outlet pipe (1). The invention discloses a compressor assembly. The compressor is advantaged in that refrigerant before entering the gas-liquid separator enters the hybrid heat exchange cavity to be heated and then is guided into the compressor shell to be compressed, the air suction superheat degree of the compressor is effectively increased, the situation that liquid is carried in air suction of the compressor is prevented, liquid impact is prevented, and running reliability and safety of the compressor are guaranteed.

The invention belongs to the related technical field of electromagnetic nondestructive testing, and discloses a defect detection method based on a ferromagnetic plate. The detection method comprises the following steps that: (1) a magnetic sensor is fixed on a ferromagnetic plate, wherein a through groove is formed in the ferromagnetic plate, the through groove penetrates through the ferromagnetic plate in the thickness direction of the ferromagnetic plate, and the through groove penetrates through the area, covered by the magnetic sensor, of the ferromagnetic plate; and (2) in a magnetizing field, defect scanning is performed on a magnetized workpiece to be detected by the magnetic sensor and the ferromagnetic plate, wherein a leakage magnetic field generated by the through groove under the action of the magnetizing field and a leakage magnetic field generated by a defect on the workpiece to be detected are mutually magnetized and enhanced. According to the invention, shaking is avoided, the wear resistance of the magnetic sensor is enhanced, on the other hand, the magnetic flux leakage detection signal is enhanced, and the magnetic flux leakage detection sensitivity is improved.

The invention provides a centrifugal compressor. The centrifugal compressor comprises a motor, a first compressor and a second compressor, wherein the motor comprises a cylinder body, a first output end and a second output end; the cylinder body is provided with a first end and a second end which are oppositely arranged; the first output end and the second output end are respectively arranged at the first end and the second end; the first compressor is arranged at the first output end of the motor; the second compressor is arranged at the second output end of the motor; and an outlet of the first compressor is communicated with an inlet of the second compressor. The centrifugal compressor directly drives impellers of the first compressor and the second compressor to rotate at high speed, so that a gear speed-increasing structure is eliminated, the centrifugal compressor has the characteristics of small size and light weight, meanwhile, mechanical loss and noise caused in a driving process of the gear speed-increasing structure are also avoided, a sound isolating device for reducing the noise can also be eliminated, and the cost is reduced.

The invention relates to the field of integrated suspended ceilings, in particular to a suspended ceiling with a vibration damping device. The suspended ceiling with the vibration damping device comprises a keel, a mainframe and a buckling plate, wherein the buckling plate is arranged below the keel, the keel comprises a main keel and a triangular keel, and the suspended ceiling is characterized in that the vibration damping device is arranged between the mainframe and the keel, and the vibration damping device is arranged on the main keel or the triangular keel. The invention provides the suspended ceiling with the vibration damping device, which has simple structure, good vibration damping effect and convenience in mounting.

A high-molecular resin used for ink powder of copier is prepared from styrene, butyl acrylate, divinylbenzene, dibenzoyl peroxide, edible gelatin and edible starch through proportional mixing, reaction, washing, dewatering, drying and sieving. Its advantages are no toxicity, low cost, and no pollution of environment.

This invention discloses a converter test circuit. The test converter work in the inverter of 'DC - single-phase AC or three-phase AC'. That is to transform DC into single-phase or three-phase AC, thetestes converter DC-DC is connected to power supply, and there is a the DC power supply is a energy storage capacitor between the negative and positive, the AC end is connected to high inductive load. In test, described high inductive load through the pulse width modulation control of the converter, achieve the energy cycle between energy storage capacitor through reactive power. Adopt the test circuit, as long as the appropriate control of the converter can achieve converter work with the actual work in the same current and power conditions to get equal effective test data of existing technology, but the actual energy loss was very small.

The invention discloses a plate painting apparatus, which comprises a conveying support roller and a painting system, wherein the conveying support roller is positioned at the inlet of the painting system, the painting system comprises a box body, a paint bin positioned in the box body and painting rollers, the painting rollers comprise upper painting rollers and lower painting rollers, two sets of the upper paint guide rollers and two sets of the lower paint guide rollers are respectively arranged, and the structures of the upper paint guide roller and the lower paint guide roller respectively comprise a rotating shaft and a paint guide brush arranged on the rotating shaft. According to the present invention, the paint guide rollers drive the plate to move forward while the plate is painted, such that the mechanical noise is avoided, and the work efficiency is increased; the painting work is completed in the box body so as to avoid the environmental pollution caused by paint splashing; and the excess paint automatically falls back to the bottom outlet of the box body, and then refluxes to the paint bin so as to be reused, such that the cost is reduced.

The invention relates to the technical field of hydraulic motor pumps, in particular to a four-quadrant operation hydraulic motor pump. The four-quadrant operation hydraulic motor pump is characterized by comprising a main shaft, a motor rotor is pressed on the main shaft, the main shaft is supported and installed on a front shell and a rear end cover through a first bearing and a second bearing,the motor rotor is connected with the main shaft through a drum-shaped spline coupling, the motor rotor is fixed in the front shell through a partition disc, a motor stator, a motor end cover, a thirdsealing ring, a second sealing ring, a first sealing ring, a third screw and a third gasket, the motor stator is pressed on an inner hole of the rear shell, the rear end cover, a first end surface sealing gasket, the rear shell and a second end surface sealing gasket are fixed on the front shell through a fourth screw and a fourth gasket, a rear sealing cover and a rear sealing cover sealing ringare fixed on the rear end cover, a front sealing cover, a first front sealing cover sealing ring and a second front sealing cover sealing ring are fixed on the front shell. The four-quadrant operation hydraulic motor pump has the advantages of being mute, efficient, energy-saving, high in power density, good in speed regulation performance, compact in structure, free of external leakage and the like, and is particularly suitable for occasions with potential load characteristics and relatively frequent switching of forward and reverse rotation.

The invention provides a synchronizing device, a synchronizing device speed regulating system and a vehicle, and relates to the technical field of vehicles. The synchronizing device comprises a gear and an output shaft. A friction plate groove is formed in the inner ring of the gear. The output shaft is provided with an oil inlet hole with a sealed end and an oil outlet hole communicating with theoil inlet hole. The outer side of the output shaft is connected with a friction plate. The output shaft is arranged on the inner ring of the gear, and the friction plate is clamped on the friction plate groove. Hydraulic oil entering the output shaft from the oil inlet hole enters the friction plate groove from the oil outlet hole to push the friction plate, so that friction force is formed between the friction plate and the side wall of the friction plate groove, and the gear and the output shaft are synchronized. The synchronizing device is compact and simple in structure, and layout spaceis saved. According to the synchronizing device, mechanical devices (gear hubs, gear sleeves, soldered teeth and synchronizing rings) are omitted, secondary impacts are reduced, and mechanical noise of the end faces of the soldered teeth of a gear sleeving machine is avoided.

The invention discloses an ultra-silence underwater propeller. Mechanical noise generated by an engine and mechanical transmission cannot be generated. The ultra-silence underwater propeller comprisesa spindle-shaped shell, wherein a closed cavity is formed between a water inlet and a water outlet of the shell; the cavity is divided into three cavity bodies by two rubber plates installed on the shell; one-way valves are installed at water inlets and water outlets of the cavity bodies; and electromagnets are installed on the rubber plates.

A high-molecular resin used for ink powder of copier is prepared from styrene, butyl acrylate, divinylbenzene, dibenzoyl peroxide, edible gelatin and edible starch through proportional mixing, reaction, washing, dewatering, drying and sieving. Its advantages are no toxicity, low cost, and no pollution of environment.

The invention relates to a device and a method for reducing noise of a microwave oven. The device comprises an oil cooling system used for cooling anodes of magnetrons in the microwave oven. In the method, the oil cooling system is adopted to replace an air cooling system and perform radiating treatment on the magnetrons in the microwave oven. In the device and the method, the oil cooling system is adopted to replace the air cooling system; and compared with the air cooling system, the oil cooling system has higher radiating efficiency and radically solves the problem of mechanical noise of a fan so as to greatly reduce the noise when the microwave oven works.

The invention relates to the technical field of atomic force microscopes, and discloses a dual-probe atomic force microscope. The double-probe atomic force microscope includes two sets of mechanical detection components, two sets of photothermal excitation components, two sets of probe components and optical components. The photothermal laser of the thermal laser, the probe assembly includes a microcantilever and a probe tip fixed on the microcantilever, the optical assembly can focus the detection laser on the front end of the microcantilever, and focus the photothermal laser on the front of the microcantilever rear end. The invention adopts two sets of probe components, which have high detection sensitivity; adopts photothermal excitation components to control the vibration frequency of the microcantilever, avoiding the appearance of mechanical miscellaneous peaks, and two sets of mechanical detection components and two sets of photothermal excitation components share a set of optical components, compact structure.

The invention discloses a multi-point three-dimensional tongue image acquisition unit for tongue diagnosis equipment. The multi-point three-dimensional tongue image acquisition unit comprises a hollow hemispherical support with a downward opening. The hemispherical support is 25cm in radius. Four tongue-side cameras are evenly arranged in front of the bottom of the hemispherical support. Chord length between each two adjacent tongue-side cameras is 6cm. A line connecting the center of a line of the middle two tongue-side cameras and the center of sphere of the hemispherical support is perpendicular to the line of the two cameras. The top center of the hemispherical support is provided with a tongue-top camera. The hemispherical support is provided with at least 50 point light sources which are evenly arranged on the hemispherical support. The five cameras on the hemispherical support are used for multi-viewpoint three-dimensional acquisition of tongue images at the distance of distinctive vision of eyes, three-dimensional images of tongues can be displayed completely, errors and mechanical noise and the like caused by motion of the cameras can be avoided, and judging and analyzing illness state thoroughly and completely is convenient for doctors.