41results about How to "Eliminate vibration noise" patented technology

A noise canceling apparatus (1) comprises an amplifier (10) for amplifying a measured signal (ms) outputted from a measuring device (3), an analog filter (11), an ADC (12), a digital filter (14), a coefficient control section (13), and a data input section (15). The digital filter (14) is a notch filter for attenuating a frequency component of a quantitative signal D(n) outputted from the ADC (12) at a plurality of notches (stop bands). A transfer function of the digital filter (14) is expressed by the product of a plurality of factors each having a root that corresponds to each one of the plurality of notches. The coefficient control section (13) changes a frequency component of a root corresponding to a notch selected from the plurality of notches, and thereafter, expands in a polynomial the transfer function of the reconstructed digital filter (14). On the basis of the polynomial thereby obtained, a new series of filter coefficients is calculated. A filter characteristic is controlled in such a manner that it conforms to a frequency variation of a fixed-period vibration noise, whereby the fixed-period vibration noise that varies in frequency is attenuated with a high degree of precision.

The present invention discloses an air suspension train for rail haulage and space launch and its special-purpose equipment. It is formed from air compressor, jet slide plate, slipper and train body, trackway component and power device. It utilzies the air bearing effect produced by jet slide plate to implement microresistance glide, and uses the diagonal bridge overhead rail. It is simple in structure, light in weight, reliable, can run at ultraspeed and can economize lots of energy source, and is a traffic tool combining the advantages of air cushion ship and cable car railway, etc. and can implement supersonic acceleration aviation by utilizing aerospaceplane.

The invention relates to a fan module which comprises a fan and a silencing device which is arranged on the fan. The silencing device comprises a first silencing assembly, the first silencing assembly is attached to one side o the fan, an airflow passage corresponds to an air port of the fan, and the first silencing assembly is made of porous materials to absorb winding cutting sound or vibration generated in fan operation to reduce the noise generated in the fan operation.

The invention discloses an oscillation mechanism for a soil VOCs treatment instrument and the soil VOCs treatment instrument, and relates to an oscillation mechanism for oscillating a soil sample. Thepurpose of the invention is to provide an oscillation mechanism for a soil VOCs treatment instrument and a soil VOCs treatment instrument with simple structure and excellent oscillation effects. Theoscillation mechanism for the soil VOCs treatment instrument comprises sampling bottles, the oscillation mechanism is used for vibrating the sampling bottles, the oscillation mechanism is arranged inan acute-angle inclined manner relative to the ground, the sampling bottles can automatically flow to the next procedure after finishing oscillation in the oscillation mechanism, the oscillation mechanism comprises oscillation guide rails, the oscillation guide rails are arranged in the flow direction of the sampling bottles and are arranged in an acute-angle inclined manner relative to the ground, and a plurality of sampling bottles are sequentially arranged on the oscillation guide rails in the flow direction and are horizontally arranged relative to the oscillation guide rails. The soil VOCs treatment instrument also comprises a headspace mechanism, the headspace mechanism is used for carrying out the headspace to the sampling bottles, the headspace mechanism is arranged in parallel relative to the ground, and the sampling bottles can automatically flow from the oscillation mechanism to the headspace mechanism.

A key assembly which is configured to provide improved click feeling to a user and an electronic device having the same are provided. The key assembly includes a key body of elastic materials and contact projections, each of the contact projections which is protruded and formed from the key body and presses a switch device spaced apart from the key body by a gap providing a certain interval, wherein the key body is installed such that a contact surface of each of the contact projections is in contact with and pushed back by a certain distance by a pre-loading force of the switch device.

The invention discloses a fixed swing gate movement with damping property and flexibility. A radial buffering body and an axial buffering body are additionally arranged in an inner structure of the movement. In an operation process of the movement, vibration noise caused by manufacturing and mounting errors is not caused; meanwhile, in a rotation process, when the movement is dynamically impacted, the damage of the impact to a movement component can be relieved, and the impact of gate machine passage pedestrians to a vehicle can also reduced. A door wing fixing plate in a rotating cylinder component is connected to a rotating cylinder by a screw or a rivet other than a welding way, so that machining and surface treatment on the rotating cylinder are greatly facilitated, the surface treatment quality can be improved, and precision error caused by a connecting process is eliminated.

The invention discloses an external gear pump and an electric lubricating oil pump. The electric lubricating oil pump includes the external gear pump and an installation plate. The external gear pumpis arranged on the installation plate through a screw. The external gear pump includes a pump shell with a pump chamber formed through buckling an upper shell and a lower shell, and two gears which are externally meshed with each other and are arranged in the pump chamber through bearings. The gears are driven to rotate by a motor. An end surface of the pump chamber includes an oil inlet groove,and the oil inlet groove is extended along a rim direction of each gear and is superposed with gear teeth of at least part of the gears on the side of an oil inlet cavity. At least one side of each gear is provided with the oil inlet groove, and the oil inlet groove is connected with an oil inlet pipeline. By adopting methods of supplementing oil from the side of the gear and supplementing oil through a tooth crest superposition mode, an area of the oil inlet cavity is increased, oil intake of a single tooth crest direction is reduced, and an insufficient filling phenomenon of lubricating oilcaused by a radial centrifugal force is avoided. A vibration noise and flow drop caused by cavitation are eliminated, and power losses of the electric lubricating oil pump are reduced.

The invention discloses an indoor safety lock which comprises a fixed base and a baffle block, wherein the fixed base comprises a mounting plate and a hinged block; the hinged block and the mounting plate are integrally formed; a strip-shaped hole is formed in the hinged block; one side of the baffle block is provided with a rotary shaft; the rotary shaft is inserted into the strip-shaped hole and capable of rotating in the strip-shaped hole; an elastic part capable of horizontally supporting the rotary shaft is arranged in the strip-shaped hole; the inner side of the hinged block is provided with a clamping edge; and a clamping slot matched with the clamping edge is arranged on the baffle block. According to the scheme, during mounting, only the fixed base is required to be mounted on a door frame, and a fixing part is not required to be arranged on a door plate, so that damages to a door are relieved.

The invention discloses a miniature low-frequency vibrator capable of being directly driven by an audio signal, which belongs to the technical field of vibrators and comprises a base, an upper cover,a side cover, a flexible circuit board, a coil, a magnet, a balancing weight, elastic pieces, an inner welding sheet, an outer welding sheet, an insulating adhesive tape and a buffer body. According to the invention, the magnet and the coil adopt a double-drive structure of which the upper surface and the lower surface are symmetrical, so that components of electromagnetic force in the non-vibration direction are mutually counteracted, and vibration noise is eliminated. The elastic piece adopts a V-shaped structure, so that the effective length of a deformation area is increased, and the response frequency can be lower. The two V-shaped elastic pieces are distributed in a central symmetry manner, so that the operation is more stable. The buffer body is used for preventing the elastic pieces from bearing large impact force and being damaged when the circuit voltage is too high, and the service life is prolonged.

The invention provides a water pan water level control device, a control method of the water pan water level control device and an air conditioner. The device is used for controlling the water level of a water pan. The water pan comprises a bottom plate and a side wall and further comprises a water pump arranged in the water pan and used for extracting condensate water in the water pan, a pipeline through which the interior of the water pan communicates with the external environment, a temperature sensor arranged on the pipeline, a connector water pipe connected with the water pump, and a mainboard circuit electrically connected with the temperature sensor and the water pump and used for controlling the water pump to run. One end of the pipeline communicates with the interior of the water pan through the bottom plate, an opening is formed in the other end of the pipeline, and the vertical height of the other end of the pipeline is larger than the preset height of a water full protection position. The vertical distance between the temperature sensor and the bottom plate is a preset value. The water pan water level control device is free of noise and better in use effect and has the beneficial effects of being stable, reliable, capable of saving space, low in cost and the like.

The invention belongs to the technical field of clothes treating, aims to solve the problem that the operation of existing clothes treating equipment cannot be thoroughly turned off during severe vibration to stop the vibration of the clothes treating equipment, and provides clothes treating equipment and a vibration switch device for the same. The vibration switch device comprises an elastic swing component, a first connector, a second connector, an electromagnetic component and a switch. When the vibration amplitude of the clothes treating equipment exceeds a set threshold, the elastic swingcomponent swings to connect the first connector and the second connector to turn on the electromagnetic component to turn off the switch so as to disconnect a control loop; the elastic swing component in a natural state separates the first connector and the second connector through elastic force to turn off the electromagnetic component to turn on the switch so as to connect the control loop. Thevibration switch device can sensitively and accurately control the on and off of the clothes treating equipment, guarantee that the clothes treating equipment operates stably and reliably and improveuser experience.

The invention provides an energy-saving exciting diversion iron-core reactor, which comprises an iron core and an iron core assembly device, wherein the iron core comprises an upper yoke, a lower yoke and core columns; coils are wound outside the core columns in a hidden manner; each core column is formed by stacking multiple groups of air gap plates and magnetic conductive discuses at intervals and is arranged between the upper yoke and the lower yoke; hollow magnetic guide cakes are arranged between each core column and the upper yoke and between each core column and the lower yoke respectively; the iron core assembly device comprises bases, center pull rods arranged on the base and pressure plates; the pressure plates are arranged at the upper part of the upper yoke; the bases are arranged at the lower part of the lower yoke; each center pull rod runs through predefined holes in the upper yoke, the lower yoke and the corresponding core column; the upper end of each center pull rod is fixed to the corresponding pressure plate; and the lower end of each center pull rod is fixed to the corresponding base. The energy-saving exciting diversion iron-core reactor has the beneficial effects that (1) the exciting heating problem in the magnetic flux shunting process is solved; (2) vibration noise caused by an AC fundamental wave is eliminated; and (3) the total loss is reduced by 25% under the same conditions of a traditional product and the hot-spot temperature rise is reduced to within 90K from more than 150K.