45results about How to "Reduce or eliminate noise" patented technology

Described herein are nose-reduced nasal devices configured to reduce or eliminate the unwanted noises associated with use of a nasal device. These noise-reduced nasal devices include a flap-valve airflow resistor and a noise-reduction feature that is a noise-reduction element, a noise-reduction flap valve, or both. The noise-reduction feature typically prevents the flap valve from oscillating or vibrating and producing an audible sound during use, particularly during inhalation through the device. The method and devices described herein may prevent the flap, and particularly the edge region of the flap face or tip of the flap, from oscillating during inhalation.

A transducer that reduces noise, increases sensitivity, and improves the time response of a linear variable differential transformer (LVDT). The device replaces the primary coil and the high permeability ferromagnetic core of conventional LVDTs with a primary wound around a moving non-ferromagnetic core. In addition to reducing or eliminating Barkhausen noise, this approach reduced or eliminated a number of other undesirable effects in conventional LVDTs including excessive eddy current heating in the core, non-linearities associated with high permeability materials and the length scale of the flux circuit. These improvements are coupled with improved LVDT signal conditioning circuitry. The device is also an actuator and may be used to convert differential voltages into force. Devices with these improvements have numerous applications, including molecular force measurements, atomic force microscopy and manipulation technology, lithographic manufacturing, nanometer scale surface profiling and other aspects of nanotechnology.

The invention relates to integrated circuit technologies, particularly to a high-precision fully differential amplifier based on a chopper technology. A common-mode feedback technology and the chopper technology are used for reducing offsets and noises. The common-mode feedback technology and the chopper technology are mainly used in the high-precision fully differential amplifier based on the chopper technology, a chopper module is composed of two multipliers and two operational amplifiers, wherein two of the multipliers and the operational amplifiers are controlled by the same clock, an input signal VIN enters the first multiplier for modulation, the modulated signal enters the first operational amplifier for amplification, the output signal enters the second multiplier for modulation after reversing, and the finally-modulated signal enters the second operational amplifier for recovery and amplification. Compared with an existing fully differential amplifier circuit, the high-precision fully differential amplifier based on the chopper technology has the advantages of achieving low noises, low offset voltages and high precision in a frequency band due to the fact that the common-mode feedback technology and the chopper technology are utilized.

The invention provides an electronic expansion valve which comprises a valve body (1), a sleeve (2) connected to the upper end of the valve body (1), a valve seat (5) arranged in the valve body, a nut (6) connected with the upper end of the valve seat and a magnetic rotor (3) which is arranged outside the nut and matched with the upper part of the nut through a screw rod (4), wherein a cavity is formed between the inner walls of the sleeve (2) and the valve body (1) and the outer walls of the nut (6) and the valve seat (5). The electronic expansion valve is characterized by also comprising a baffle plate (15) and a damping channel (151), wherein the baffle plate is arranged in the cavity to divide the cavity into an upper cavity (101) and a lower cavity (103); and the damping channel (151) is communicated with the upper cavity and the lower cavity. According to the electronic expansion valve, because the cavity used for accommodating fluid is divided into the upper cavity and the lower cavity through the baffle plate, and intense interference to the magnetic rotor of fluid pulse is reduced through the damping channel, resonance is prevented, and noise is reduced or eliminated.

The invention discloses an active noise control system for a fan of a portable computer. The active noise control system comprises a residual noise acquisition unit, a de-noising feedback control unit and a noise offset unit; the residual noise acquisition unit is used for acquiring sound signals of a specific spatial position, and comprises a built-in single-track microphone of the portable computer and an analog / digital converter of a built-in sound card of the computer; the de-noising feedback control unit is used for generating offset signals to drive the noise offset unit according to signals outputted by the residual noise signal acquisition unit, and comprises a central processing unit of the computer; and the noise offset unit is used for outputting offset sound waves, the offset sound waves and noise sound waves of the radiating fan of the computer are subjected to offset interference in a certain spatial range, the noise offset unit comprises a digital / analog converter of the built-in sound card of the computer and built-in stereo speakers of the computer, and the stereo speakers include a left-track speaker and a right-track speaker.

The invention discloses an image contrast enhancement method and apparatus. According to the method and apparatus, after a current image Pt is converted into a YUV format, analyzing is respectively carried out according to different features of an image bright area and a dark area so as to generate two brightness index tables through obtaining an average brightness compensation value of the current image PT and segmenting a histogram of a brightness component of the current image Pt, accordingly, the two brightness index tables are spliced according to a size sequence of brightness values to generate a total brightness index table, a chroma index table is generated according to the brightness index table, and the brightness component of the image is effectively corrected and compensated through the generated total brightness index table, such that the contrast scope of the image is dynamically expanded, local details can be salient, and an incorrect dynamic scope of the image is avoided. Since a chroma component is also correspondingly compensated according to the generated chroma index table, self-tone and saturation of the image can be maintained without distortion to the maximum degree.

A multi-cylinder internal combustion engine with a camshaft-driven valve mechanism comprises at least two inlet valves and / or exhaust valves and a valve mechanism including a camshaft arranged in the cylinder of the engine, wherein the pair of valves are operated by the cam crown of a common camshaft and a cam driven part. The valve mechanism may include mechanical or hydraulic clearance adjusters capable of being operated independently. The cam driven part contacts with the cam crown of the common camshaft and at least two push rods, each push rod includes associated single-planar rocking arm, and the rocking arm is connected with a pivot arranged on a cylinder cover for driving the at least two valves.

The present invention provides a method, apparatus, and computer implemented instructions for computer-based onboard noise suppression devices with remote web-based management features. The present invention detects noise within a computer. A noise canceling signal is generated based on parameters. These parameters may include, for example, the percentage of noise to suppress. The noise canceling signal is broadcasted to reduce or eliminate noise. Additionally, the present invention provides the ability to remotely manage noise suppression within computers.

A table top circular saw cutting machine provided, for example, with a table on which a material to be cut is placed and with a cutting machine body having a saw blade rotated by an electric motor may have a phenomenon in which a high-frequency electric current generated in the vicinity of the electric motor is amplified on the table side to become noise to peripheral equipment. The invention reduces the noise. A cutting machine is configured in such a manner that conduction of a high-frequency electric current is blocked by installing insulating members (16, 16) on a support shaft (15) for supporting the cutting machine body (20) so that the cutting machine body can be tilted in the vertical direction relative to a body support section (50) which is mainly composed of a table.

The invention discloses an air flue system, a refrigerator with the same and a control method of the air flue system and the refrigerator. The air flue system comprises a main air flue and a fan module, and is characterized in that the fan module comprises a first fan and a second fan which are distributed on the cross section of the main air flue side by side, P blades which are uniformly distributed are arranged on each of the two fans, and the air flue system further comprises a control module which is at least used for controlling the second fan to be started at a first revolving speed n after controlling the first fan to run at the first revolving speed n for a first preset time t, wherein the first preset time t is integer multiples of 30 / (n*P). Compared with the prior art, the air flue system is provided with the two fans in the main air flue, refrigerating efficiency and temperature controllability are improved, furthermore, running of the two fans is controlled, so that the two fans respectively serve as sound sources, generated sound waves intervene with each other, and the purpose of reducing or eliminating noises is achieved.

The invention discloses a multifunctional fresh air mullion which comprises a fresh air mullion body and a movable glass inlay stopper. The movable glass inlay stopper is connected with the side surface of the fresh air mullion body through screws, end covers are arranged at the upper end and the lower end of the fresh air mullion body, the fresh air mullion body is divided into an electric ventilation part, an electric control part, a manual control part and a natural ventilation part from top to bottom, a first ventilation grilling and a second ventilation grilling are arranged in the fresh air mullion body, and the fresh air mullion body is divided into an outdoor air inlet cavity, a middle cavity and a filter cavity by the first ventilation grilling and the second ventilation grilling from an outdoor side to an indoor side. The multifunctional fresh air mullion has bearing, strengthening, dividing and decorating functions on door and window mullion when being applied to doors and windows and can serve as an indoor fresh air system, filtered, heated and sterilized outdoor air is led into the indoor spaces, window sashes cannot be opened, so that the indoor air and the outdoor air can be circularly interacted, the indoor air always keeps clean and fresh, and indoor air quality can be improved.

In a cutting machine, such as a table-top circular saw having a table for placing thereon a workpiece, and a cutting machine body having a saw blade rotated by an electric motor, there may be caused a phenomenon in which a high frequency current generated in the vicinity of the electric motor is amplified on the side of the table to generate noises to the peripheral devices, and it is an object of the present invention to reduce such noises. It is configured to attach an insulation member (16, 16) to a tilt support shaft (15) that vertically movably supports a cutting machine body (20) relative to the side of a body support section (50) constituted mainly by a table, so that conduction of the high frequency current is blocked.

The invention relates to a fixing device, in particular to a device for preventing a hydro-pneumatic spring from swinging, comprising the hydro-pneumatic spring, a cross arm and a mounting seat arranged on the cross arm, wherein the cross arm is arranged between a vehicle body and a hub assembly; the hydro-pneumatic spring is arranged between the cross arm and the vehicle body; the cross arm consists of an upper cross arm and a lower cross arm, and the lower cross arm is provided with the mounting seat; two ends of the hydro-pneumatic spring are provided with mounting rings, the mounting ring at one end of the hydro-pneumatic spring is hinged to the mounting seat of the lower cross arm, and the mounting ring at the other end of the hydro-pneumatic spring is hinged to the vehicle body; two sides of the mounting seat of the lower cross arm are provided with anti-swing ejector rods, the peaks of the anti-swing ejector rods at the two sides of the mounting seat support against the end surfaces of the mounting rings, and the distance between the two peaks of the anti-swing ejector rods at the two sides of the mounting seat is equal to the height of the mounting rings. In the invention, the two sides of the mounting rings of the hydro-pneumatic spring are provided with the anti-swing ejector rods, therefore, the swing of central lines of the mounting rings at two ends of the hydro-pneumatic spring due to mounting positions and suspension motion can be reduced, and noise caused by the swing can be reduced or eliminated.

The invention discloses a safety and environment-friendly cutting machine, which comprises a workbench, four outriggers are evenly and symmetrically arranged at the bottom of the workbench, a shock absorbing device is arranged at the bottom of the outriggers, and the top of the workbench is fixedly arranged sequentially from left to right The material propulsion device, the first material fixing device, the cutting device and the second material fixing device, the cutting device includes a cutting box and a cutting mechanism inside the cutting box. The beneficial effects of the invention are: when the cutting machine is working, the sparks and noises generated when the cutting saw is in contact with the material to be cut are greatly reduced or eliminated, and the metal or non-metal waste generated by cutting will not spread around, threatening The health of the staff, at the same time, the setting of the shock absorbing device makes the cutting machine work, the maximum reduction or elimination of the vibration of the cutting machine, thereby avoiding the damage of the internal parts of the cutting machine, which greatly prolongs the life of the cutting machine. service life.

The invention relates to the technical field of shelves and discloses a shelf and a cold storage device. The shelf comprises a shelf main body, wherein the shelf main body comprises a front shelving surface and a back shelving surface which are opposite; and the shelf main body is provided with a pair of opposite side edges which are outwards provided with limited flanges. The shelf has the beneficial effects that the limited flanges of the shelf are outwards arranged on the opposite side edges of the shelf main body, so that when the front surface or the back surface of the shelf is used, the limited flanges can be used as limited structures for limiting the position of the shelf so as to achieve the purpose of using the two surfaces of the shelf; a user can select any one surface as the front surface, thereby enhancing the use value of the shelf; and even though the shelf is reversely put by the user due to carelessness, the shelf still can be limited, thereby facilitating user application.

The invention relates to the technical field of drive shafts of vehicles, and provides a sheath used for a driving shaft, the driving shaft and a vehicle. The sheath used for the driving shaft includes a sheath wall, the whole sheath wall extends in the axial direction, the sheath wall is provided with a spiral spring extending in the axial direction so as to effectively absorb impact and abnormal sound noise generated by the driving shaft due to radial clearances and axial clearances in the torque transmission and movement processes, and therefore the performance of the vehicle can be improved.

Provided is a cable duct cover plate with an earthquake prevention, noise reduction and water isolation function. A cover plate body is provided with two side faces in the width direction, the lower portion of one side face protrudes outwards to form an edge in lap joint, and the upper portion of the other side face protrudes outwards to form a lap joint edge. Adjustable bearing feet are arranged at the four bottom corners of the cover plate body respectively. After the cover plate is mounted, due to the fact that cover plates are in lap joint, good integrity is achieved, strong firmness is achieved, and the pressure bearing capacity is greatly improved. If the mounting face of a cable duct groove is out of flatness and the bottom face of the cover plate is damaged to influence flatness, the flatness of the cover plate can be adjusted conveniently by properly rotating the bearing feet and adjusting the height, and noise generated by the cover plate due to pressure bearing can be reduced or eliminated. In addition, gaskets are arranged on the lap joint edge of the cover plate and the two sides of the bottom wall of the cover plate, and the earthquake prevention and noise reduction effect is better. Besides, a groove is formed in the inner side of the edge in lap joint, rainwater on the top face of the cover plate can be prevented from entering a cable duct, and the interior of the duct is kept dry.

The invention provides an expansion chamber resistant noise-reducing structure for an automotive power steering high-pressure oil pipe, which is composed of a ball joint, a reducing steel tube, a high-pressure rubber tube and a metal sheath, wherein the outer diameter at two ends of the reducing steel tube is small and the outer diameter in the middle of the reducing steel tube is big, and different sections with small outer diameter and big outer diameter are in smooth transition for integration; one end of the reducing steel tube is connected with the ball joint by high-frequency welding, and the other end of the reducing steel tube is fastened with the high-pressure rubber tube and the metal sheath together to from a sealing structure; and the ball joint is processed and formed by the machining via a numerical control machine, and the reducing steel tube is formed by using a special die to perform the cold-extruding and stretching. In the invention, the expansion chamber resistant noise-reducing structure is formed after the whole high-pressure steel tube is contracted so as to effectively reduce or eliminate noise in a steering system. The MOAN noise in the steering system is eliminated; a liquid channel pipe adopts a thick tube segment with a large section and a thin tube at the terminal thereof to section and length of an expansion chamber to change reflective property and interference property of an acoustic wave, thereby further changing noise elimination quantity and maximum noise elimination frequency.

The invention discloses a composite type marine noise reduction structure, wherein a damping layer, a steel sheet or a steel plate and a dressing layer are sequentially laid on a horizontal steel deck. The combined-type structure provided by the invention can be used for greatly reducing educe or eliminating noises. The damping layer has better adhesive force, the damping and vibration reducing performances are good, the composite type marine noise reduction structure is shockproof, salt spray-resistant, sea water-resistant, hot-cold alternation-resistant, and is green and environmental-friendly protection; since the steel sheet or steel plate has high unit area mass, the material is heavy or compact, therefore, the sound insulation effect is excellent; the dressing layer can effectively protect the deck, so as to achieve heat insulation and light effects.

The invention relates to a novel integrated high-voltage circuit on-off connection system. The system comprises a high-voltage power supply, a high-voltage load and a high-voltage on-off connection device; the high-voltage power supply is electrically connected with the high-voltage on-off connection device through a high-voltage connection terminal; the high-voltage load is electrically connected with the high-voltage on-off connection device through the high-voltage connection terminal; and the high-voltage power supply and the high-voltage load are connected through a connecting interface of the high-voltage on-off connection device to form a high-voltage loop; the high-voltage on-off connection device comprises a plurality of assembly shafts and a plurality of contact bodies, the contact bodies are sequentially assembled on the assembly shafts at intervals, a conducting layer is arranged on the surface of each contact body, and the plurality of contact bodies can be in high-voltage conduction through the conducting layers after being in contact with one another; and a power source provides power for the assembly shafts, so that the assembly shafts can rotate or move and drive the contact bodies assembled on the assembly shafts to execute actions according to requirements. With the system adopted, high-voltage loop switching on and switching off is achieved. The system is highly integrated, is safe and stable in high-voltage switching on and switching off, enables smooth sliding contact, and can reduce noise.

The invention relates to the field of pipes and application of the pipes, and in particular relates to a silencing water pipe. The silencing water pipe comprises a water pipe body, a water flow channel is formed in the water pipe body, and a buffer structure for changing the water flow direction is arranged in the water pipe body along the length direction or / and the radial direction, so that thewater flow speed in the water flow channel is reduced; and a sound absorption material is arranged in the water pipe body and / or the buffer structure. According to the silencing water pipe provided bythe invention, noise generated by water flow impact during water inflow can be remarkably reduced or eliminated, then the situation that a user judges that the water pipe has water leakage by mistakeis avoided, and thus the use experience of the user is improved. The invention further relates to a washing machine, and the washing machine is internally provided with the silencing water pipe.

The invention provides a high-altitude water falling silencer special for an air conditioner outdoor unit. The high-altitude water falling silencer mainly comprises a closely-woven stainless steel cloth cushion layer, a water absorbing sponge cushion layer and a waterproof double-faced adhesive tape layer. The device can be applied to the field of civil ventilating air conditioners and used for eliminating the noise problem caused by high-altitude water falling to the air conditioner outdoor unit.

The invention relates to a disc hub assembly and a dual mass flywheel. The disc hub assembly comprises a disc hub (1) and an elastic component (3), the disc hub (1) is provided with an inner connecting part used for being connected with a shaft piece (2) in an anti-rotation mode on the radial inner side, and the elastic component (3) can be tensioned between the disc hub (1) and the shaft piece (2) in the axial direction when the disc hub (1) is connected with the shaft piece (2) in an anti-rotation mode, so that friction damping in the circumferential direction is formed between the disc hub (1) and the shaft piece (2). The dual-mass flywheel comprises the disc hub assembly.

Disclosed is a double-cylinder cross-regulation prime motor which is a prime motor, pertaining to the field of mechanical power. The prime motor utilizes the pressure intensity and pressure in a cylinder to drive a pawl by the piston of a cylinder; the pawl drives compound wheels, which enables the compound wheels with different diameters to be meshed with pinions, so that the pinions can drive a link rod on a crank shaft; the crank shaft uses a force several times higher than the pressure value of the cylinder to jack up the piston; when the piston is jacked up to the highest place, the pressure of the other cylinder drives a piston thereof to move downwards; a pawl connected on the piston drives the other part of compound wheels to be meshed with the pinions to cause the piston of the original cylinder to be jacked up, thereby finishing a period of movement; during operation process, the energy of the double cylinders is recycleed and applies work until the energy is run out or insufficient, and then work is stopped and machines stop. The double-cylinder cross-regulation prime motor can greatly improve the efficiency of the prime motor and can serve as the prime motors of mechanical equipment, means of conveyance, etc.

A radioactive air on-line monitoring device is provided with a detection chamber, air in a monitored environment is extracted, compressed and guided into the detection chamber, so that the air pressure in the detection chamber is higher, the air density is larger, a detection device (including a detector) used for detecting the radioactive level in the air is arranged in the detection chamber, the air is compressed to a proper compression ratio, so that the high-dose air sample capable of reflecting the real radiation level of a monitoring object (the measured atmosphere) is obtained. The air density in the detection chamber is larger, and the concentration of radioactive substances in the air is higher, so that higher detection energy resolution and detection sensitivity are achieved, the detectable lower limit can be improved, and the detection accuracy is improved. The purpose can be achieved without configuring a high-sensitivity detector (such as HPGe), that is to say, high detection energy resolution and detection sensitivity are achieved under non-laboratory conditions.

The invention provides an electronic expansion valve which comprises a valve body (1), a sleeve (2) connected to the upper end of the valve body (1), a valve seat (5) arranged in the valve body, a nut (6) connected with the upper end of the valve seat and a magnetic rotor (3) which is arranged outside the nut and matched with the upper part of the nut through a screw rod (4), wherein a cavity is formed between the inner walls of the sleeve (2) and the valve body (1) and the outer walls of the nut (6) and the valve seat (5). The electronic expansion valve is characterized by also comprising a baffle plate (15) and a damping channel (151), wherein the baffle plate is arranged in the cavity to divide the cavity into an upper cavity (101) and a lower cavity (103); and the damping channel (151) is communicated with the upper cavity and the lower cavity. According to the electronic expansion valve, because the cavity used for accommodating fluid is divided into the upper cavity and the lower cavity through the baffle plate, and intense interference to the magnetic rotor of fluid pulse is reduced through the damping channel, resonance is prevented, and noise is reduced or eliminated.

Design method for mounting bracket Abstract The invention relates to a design method for a mounting bracket for an assembly line for the magnet group. The method comprises arranging the mounting seat to have an isosceles-trapezoid-like shape, providing a second through hole matching the gap of the pillar at 5 each of four vertexs to the mounting seat, arranging the first through hole symmetrically near the long edge, arranging an interference fit between the first through hole and the sleeve, adjusting the coaxiality of the mounting cover and the first through hole by the gap between the second through hole and the pillar, arranging the first 10 and second shaft portion and the thread portion to be coaxial. Because the whole mounting bracket is fastened after the assurance of coaxiality of the through hole of the mounting seat and the mounting cover is made, so the rotating shaft do not shake during its rotating, the noise is reduced or eliminated. 202 202 201 Fig.3 , / ' )