38results about How to "Stop noise" patented technology

A propeller shaft having high wear resistance is provided. The propeller shaft has a spline shaft and a spline sleeve meshing with each other, and a DLC coating is applied to any one of the spline shaft and the spline sleeve. The DLC coating has surface roughness Ra of 0.5 μm or smaller.

This invention relates to the method and apparatus for electrostatic pickup of sound from stringed musical instruments to addresses the unique requirements of acoustic stringed musical instruments with a portable, detachable, safe-to-handle, easy-to-use, low-noise, electrostatic pickup that captures the tone of the musical instrument, is usable with common musical sound systems, avoids acoustic feedback problems associated with air microphones in live settings, and is easy to manufacture using current common materials and practices.

An active noise control system is provided which cancels a noise using a secondary noise from a speaker that is operated in accordance with an output from an adaptive controller. The system is configured such that microphone monitor interrupts a switch to thereby stop the secondary noise from being produced, when an error signal delivered by a microphone used for an adaptive computation in an LMS processing portion has the same sign for a predetermined duration. This allows the system to prevent the user from hearing an abnormal acoustic noise resulting from an abnormal operation or divergence of an adaptive filter even when the output signal from the microphone used for the adaptive computation is indicative of an abnormal level.

The present invention provides a voltage-to-current converter and a voltage controlled oscillator. The voltage-to-current converter is used for converting an input voltage to generate an output current, and includes an input terminal, a resistor, a current mirror and a current generating circuit, where the input terminal is used for receiving the input voltage; the resistor is coupled to the input terminal; the current mirror is coupled to the resistor and is used for mirroring a reference current to generate a mirrored current, wherein the reference current is formed according to at least a current flowing through the resistor; and the current generating circuit is coupled to the current mirror and is used for generating the output current according to at least the mirrored current. According to the embodiment of the present invention, a small gain can be realized to avoid noise and power supply promotion problem, and also can cover the required frequency range without using a plurality of frequency bands and the digital control / correction. In addition, according to the embodiment of the present invention, all of or a part of input range can be covered linearly by a simple and low-cost circuit structure.

An apparatus for reducing noise of a shift cable, may include a stopper that is integrally formed with an inner cable of the shift cable, an anti-vibration member that is disposed around the inner cable and is spaced apart from the inner cable to selectively contact with the stopper, and a damper housing that retains the anti-vibration member and the stopper therein

A propeller shaft having high wear resistance is provided. The propeller shaft has a spline shaft and a spline sleeve meshing with each other, and a DLC coating is applied to any one of the spline shaft and the spline sleeve. The DLC coating has surface roughness Ra of 0.5 μm or smaller.

A centrifugal multi-blade fan includes a multi-blade fan section having a plurality of main blades arranged at radially inner positions and a plurality of auxiliary blades arranged at radially outer positions alternately arranged in a circumferential direction. Each adjacent main blade and each auxiliary blade are connected by a reinforcing rib, and the positive pressure surface of the auxiliary blade is preferably shaped as a plane. Therefore, the deformation of the auxiliary blade can be prevented, the basic function of the auxiliary blade can be ensured, and the airflow delivery capability and noise suppression performance of the fan can be improved.

The invention discloses a hydraulic torque converter cavitation inhibition method based on slotting. The hydraulic torque converter cavitation inhibition method based on slotting can effectively reduce the degree of cavitation and solves the problems of vibration, noise and reliability reduction caused by cavitation of a hydraulic torque converter. The hydraulic torque converter cavitation inhibition method comprises the steps that a through groove is machined in the head portion of a guide wheel vane of the hydraulic torque converter, and liquid flow flowing through the guide wheel vane is subjected to flow dividing through the through groove; and when the hydraulic torque converter is operated, the liquid flow flows from an inlet to the middle portion of the vane through the through groove to form jet flow. The functions of flow guiding and re-jet flow blocking are achieved, the passive inhibition effect of the cavitation in the hydraulic torque converter is realized, and cavitationvibration, noise and negative effects thereof are reduced.

A stopping noise reduction circuit for a start motor comprises a battery generating a power supply to drive the start motor, a key switch for controlling an on / off of the power supply, a solenoid having a permanent magnet, P and H coils, and a movement contact to drive the start motor, and further comprises a B1 terminal grounded inside the solenoid, an M1 terminal connected to an M terminal of the start motor, and a resistor coupled with the B1 or M1 terminal. In the stopping noise reduction circuit, upon an off condition of the key switch, the movement contact of the solenoid is connected to the B1 and M1 terminals such that more induced current than an induced current flowing into the P and H coils, in a current induced by a rotator of the start motor, flows to ground via the resistor within a short flow time.

The invention discloses a base assembly for a clothes dryer, and a clothes dryer having a base assembly of this type. The base assembly (16) of a clothes dryer (12) has a housing and comprises at least one partition base (18) which is arranged underneath a heat source (14) and heat sink (15) of a heat pump (13) of the clothes dryer (12), and on which the heat source (14) and the heat sink (15) are positioned, characterised in that at least one recess (19) is formed in the partition base (18), said recess being basin-like, water-tight and being open in the direction of the heat source (14), wherein a base (20) of the recess (19) is positioned entirely underneath a maximum fluid filling height F of a fluid container (21) arranged under the partition base (18) on the base side, and the heat source (14) is positioned on the base (20). The invention also relates to a clothes dryer (12) having a base assembly (16) of this type.

The invention relates to the technical field of air blower equipment, in particular to a low-noise air blower which comprises a rack, a power source mechanism, a linkage assembly, a fan blade, a flowguiding assembly and vibration absorption assemblies. The power source mechanism, the linkage assembly and the flow guiding assembly are located on the top part of the rack and are fixedly connected with the rack; the output end of the power source mechanism is connected with the stress end of the linkage assembly; the fan blade is located in the flow guiding assembly; the output end of the linkage assembly penetrates through the flow guiding assembly so as to be fixedly connected with the stress end of the fan blade; and the multiple vibration absorption assemblies are located on the bottom part of the rack and are fixedly connected with the rack. According to the technical scheme provided by the invention, a huge amount of air can be provided, and meanwhile, the generated noise is reduced.

The invention discloses a vibratory massage device and a noise reduction method thereof. The vibratory massage device comprises a massage body and a massage head; the massage body comprises a shell unit, a power supply unit, a driving motor, an eccentric driving mechanism and an installing mechanism; the shell unit is provided with an internal space and a piston channel communicated with the internal space; the power supply unit, the driving motor and the eccentric driving mechanism are separately arranged in the internal space; the driving motor is electrically connected to the power supply unit; the first end part of the eccentric driving mechanism is installed on the driving motor in a drivable way; the installing mechanism is installed on the second end part of the eccentric driving mechanism in a drivable way; the installing mechanism is movably arranged in the piston channel of the shell unit; an installing head is installed on the installing mechanism; the massage body is provided with oil storage spaces for storing lubricating oil; the oil storage spaces are formed between the outer wall of the installing mechanism and the inner wall of the shell unit.

The invention relates to the technical field of house furniture, in particular to air purification of residence bedrooms, and particularly discloses an intelligent indoor air exchange device. The intelligent indoor air exchange device comprises a low-noise reversible fan, a corrugated hose, an air supply straight pipe, a protection shell, a fan cover, a fixed CO2 concentration detector and a controller. The fixed CO2 concentration detector can monitor the concentration of CO2 in indoor space in real time and transmit the CO2 concentration value to the controller. An air exchange upper limit of the CO2 concentration value is set in the controller. When the CO2 concentration value from the fixed CO2 concentration detector is higher than the air exchange upper limit, the controller starts the low-noise reversible fan for indoor air exchange. According to the intelligent indoor air exchange device, timely and effective indoor air exchange can be carried out, air entering the indoor space can be effectively purified, organic waste gas can be decomposed, and the indoor air cleanliness and indoor environment comfort can be guaranteed; and quietness of the indoor space can be kept, and the effects of energy saving and environment friendliness can be achieved.

The object of the invention is to provide a practical performing sound insulation rubber block and a mounting method thereof. The performing sound insulation rubber block comprises a bracket and a thermal expansion sealing material, wherein the bracket is provided with a supporting groove with an outward opening in a surrounding mode, the thermal expansion sealing material is disposed in the supporting groove, and the bracket is provided with a fastener which is used for being connected with the metal sheet of a vehicle and protrudes outward the bracket. The supporting groove can limit the flow direction of the thermal expansion sealing material in the thermal expansion, achieves simultaneous outward foaming expansion on the same plane of the thermal expansion sealing material for avoiding sagging and blocks the entire cross section of a cavity, so that noise transmitted through the cavity of the vehicle can be prevented and the NVH (Noise Vibration and Harshness) performance of the vehicle can be improved. The performing sound insulation rubber block is simple in structure, low in cost, simple in mounting process and good in sound insulation effects and can locate the sound insulation rubber block accurately.

The invention discloses a low-temperature tolerance automobile belt anti-skidding agent. The anti-skidding agent is characterized by being prepared from the following raw materials in parts by weight: 68-73 parts of purified water, 2.1-2.5 parts of ammonium hydrogen fluoride, 2-2.7 parts of citric acid, 0.08-0.23 part of a sterilizing agent, 3-6 parts of an antifreezing solution and 0.08-0.15 part of a brightener. By adding the antifreezing solution into the anti-skidding agent, the skidding of a belt caused by the freezing of the anti-skidding agent in a low-temperature environment can be inhibited, noise and screaming produced during the operation of the belt are eliminated, the transmission rate of the belt is improved, the working capacities of an automobile air conditioner and a fan can be obviously improved, the working environment is improved, and the service life of the belt is prolonged; and meanwhile, by adding the brightener and the sterilizing agent, the drying, cracking and oxidation of the belt can be effectively prevented.

The invention belongs to the technical field of electrified railway traffic equipment, and provides a shock-adsorption rigid contact net for electrified rail traffic. The net includes a fixed body, afloating body, shock reducing elastic bodies, a wide-format contact line and insulating supporting seats, wherein the shock reducing elastic bodies are distributed between the fixed body and the floating body, so that the rigid contact net has certain flexibility, elasticity and shock reducing property, and shock can be prevented from spreading in the contact net. The shock reducing elastic bodiesare arranged in a scattered mode, concentrated loads at the supporting seats on the fixed body are converted into uniform loads on the floating body and the wide-format contact line, so that the pressure of a pantograph and the net always keeps consistent. The wide-format contact line is adopted, so that the effective abrasion amount is increased by 3-5 times, and the service life of the wide-format contact line is prolonged by 3-5 times or more. The net is suitable for a straight line section and a curve section, suitable for 'linear type' mounting and 'zig-zag type' mounting, suitable for equal-height mounting and height-continuous-changing mounting, and suitable for lower contact, side contact and the like.

To reduce the size / weight and the power consumption of a fan-coupling device and to provide an external control type fan-coupling device intended to improve a fan rotation controllability. A fan-coupling device, in which the inside of a sealed housing borne on a rotary shaft fixing a drive disk thereon is divided by a partition into an oil sump and a torque transmission chamber housing the drive disc, so that the drive torque may be transmitted to a driven side with the oil fed into the torque transmission chamber and so that the communication passage of oil may be opened / closed and controlled by a valve member to be activated by an electromagnet. In the fan-coupling device, a magnetic member of either an integral structure or a split structure composed of a plurality of parts and assembled integrally is arranged between the electromagnet and the valve member (or armature), and the magnetic member is so assembled in the sealed housing that the magnetic flux of the electromagnet may be transmitted through the magnetic member to the armature.

Provided is an anti-thrust mushroom-shaped member (10) for axially supporting a rotor shaft (58) of a motor (50). The anti-thrust mushroom-shaped member has an end surface (12) on which an anti-thrustsurface (14) is formed. The anti-thrust surface (14) cooperates with a mating surface (60) of the motor (50) in a mounted state, and a groove (18) is formed on the center of the end surface (12) in the radial direction, and the groove is radially arranged in the anti-thrust surface (14), so that the anti-thrust surface (14) is configured in a circular ring, wherein the anti-thrust surface has aninclination angle (27) on a radial direction (19) relative to an imaginary plane (25) perpendicular to a rotor shaft (58). Also included is a motor (10) into which the anti-thrust mushroom-shaped member (10) is mounted.

The invention relates to a door and window structure, in particular to an anti-freezing broken bridge aluminum profile glass door. The anti-freezing broken bridge aluminum profile glass door comprises a door leaf and a door frame. The door leaf comprises a first wood profile piece and a first broken bridge aluminum profile piece. The door frame comprises a second wood profile piece and a second broken bridge aluminum profile piece. A clamping groove is formed in the first wood profile piece, and a sealing rubber strip is arranged in the clamping groove. The first broken bridge aluminum profile piece is of a sectional structure, and a glue injection heat insulation bridge and a strip penetrating heat insulation bridge are connected between every two adjacent sections. The second broken bridge aluminum profile piece is provided with three adjacent sealing cavities which are used for achieving air and water equal-pressure balance. The door frame is of a door pocket structure and comprises a left door pocket plate and a right door pocket plate which is connected with the left door pocket plate in an inserting mode. The two ends of the left door pocket plate and the two ends of the right door pocket plate are provided with convex-concave grooves respectively. According to the anti-freezing broken bridge aluminum profile glass door, the door frame is convenient to install, the door leaf and the door frame are tightly closed, freezing and moisture condensation cannot occur in cold winter, the noise can be blocked out of the door, and the anti-freezing broken bridge aluminum profile glass door is environmentally friendly, and particularly suitable for scenic spots or private villas.

The invention relates to a cover assembly (1) for a motor vehicle clutch, said assembly comprising an actuating element (7), such as a diaphragm spring, said element being provided to come into contact with a pressure plate (10), the actuating element (7) being in contact with a cover (3) via at least one wire ring (6). At least one spring element (8), the cross-section of which is substantially V-shaped when unstressed and substantially C-shaped when pre-stressed, lies on the wire ring (6) in order to pre-stress said wire ring (6) in an axial direction, such that during the pre-stressing process limbs of the substantially V-shaped cross-section slide along an external surface of the wire ring (6) during the transition into the substantially C-shaped cross-section.

The invention relates to the technical field of house furniture, in particular to air purification of residence bedrooms, and particularly discloses an intelligent indoor air exchange device. The intelligent indoor air exchange device comprises a low-noise reversible fan, a corrugated hose, an air supply straight pipe, a protection shell, a fan cover, a fixed CO2 concentration detector and a controller. The fixed CO2 concentration detector can monitor the concentration of CO2 in indoor space in real time and transmit the CO2 concentration value to the controller. An air exchange upper limit of the CO2 concentration value is set in the controller. When the CO2 concentration value from the fixed CO2 concentration detector is higher than the air exchange upper limit, the controller starts the low-noise reversible fan for indoor air exchange. According to the intelligent indoor air exchange device, timely and effective indoor air exchange can be carried out, air entering the indoor space can be effectively purified, organic waste gas can be decomposed, and the indoor air cleanliness and indoor environment comfort can be guaranteed; and quietness of the indoor space can be kept, and the effects of energy saving and environment friendliness can be achieved.

The invention discloses an air dehumidifying purifier for a bathroom. The air dehumidifying purifier comprises a dehumidifying sound-proof box body, wherein air openings are formed in the two sides ofthe dehumidifying sound-proof box body; a fan is arranged above an inner cavity of the dehumidifying sound-proof box body; the right side of the fan is provided with a condenser; the right side of the condenser is provided with an evaporator; and the bottom of the evaporator communicates with a water tank arranged at the outer side of the dehumidifying sound-proof box body through a water pipe.By arranging the dehumidifying sound-proof box body, a sound-proof air inlet plate, a blade bracket, a draft fan, a suction opening, an air inlet pipe, a fan, a fan sound-proof sleeve, a sound-proof sleeve support frame, a sound-proof sponge filled cavity, a fan base, a damping rod, an auxiliary frame, an air outlet pipe, a sound-proof air outlet pipe, an air guide sound-proof pipe, an air guide hole, an air outlet hole, a sponge cylinder, a sound-proof plate, a gas via hole, an asbestos sound-proof plate, a compressor, a compressor sound-proof sleeve, an inner support frame, a water replenishing opening, a water filled cavity and a compressor base, the normal living of people is prevented from being affected by noise.

The invention relates to a plastic protective panel (1) which is made from a plastic material and which is to be attached onto a portion of the body of a motor vehicle, including a wall (3) made from a rigid plastic material and a wall (4) made from a flexible plastic material, said two walls (3, 4) contacting one another in areas (5) that surround at least one area in which said two walls (3, 4) are spaced apart from one another, characterized in that each area in which the walls are spaced apart from one another defines a cell (7), which is delimited by a sealed linkage (11) linking the flexible wall (4) and the rigid wall (3), and which is filled with air.