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 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.

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 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.

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.

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 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.