5results about How to "Change vibration frequency" patented technology

The embodiment of the invention provides a harmonic control method and device of an electric power system and a storage medium, the electric power system comprises a converter for converting direct current into alternating current, and the method comprises the following steps: determining a frequency range of a resonance point of the electric power system; under the condition that the switching frequency of the converter falls into the frequency range, determining a target resonant frequency of the resonant point; determining the type and electrical parameters of a nonlinear device needing to be added by taking the target resonant frequency as an optimization target; and setting the non-linear device in the power system. According to the method, a relatively serious resonance point in a power system is identified, and the vibration frequency of the resonance point of the power system is changed in a mode of increasing a nonlinear device, so that the frequency point of an original resonance source in a circuit is avoided, and the harmonic problem in a specific scene is solved in a low-cost mode; and long-term stable operation of a power system can be ensured.

This invention relates to the technical field of atmospheric control and air treatment, and discloses a waste gas treatment device based on the synergistic effect of low-temperature plasma and catalyst. The device includes a waste gas treatment unit, which sequentially passes waste gas through a plasma ionization zone and a catalytic zone. The plasma ionization zone ionizes the waste gas, while the catalytic zone further oxidizes or decomposes any incompletely degraded intermediate products after passing through the plasma zone. An outlet end is provided on the waste gas treatment unit, and an outlet unit is located at the outlet end. A film-breaking unit, during the waste gas treatment process, drives a permanent magnet ball to rotate, causing the permanent magnet ball to intermittently approach or move away from a spring, thus causing the spring to vibrate and preventing the formation of a gas film on the inner wall of the inlet end, thereby avoiding changes in the inlet end pipe diameter.

The utility model discloses a concrete vibrating device, and relates to the technical field of building construction. The device comprises a handle, one end of the handle is fixedly connected with a hose, and the other end of the hose is fixedly connected with a vibrating rod; a driving assembly is arranged in an inner cavity of the vibration rod. The ultrasonic motor is adopted to replace a traditional electromagnetic motor, electromagnetic noise generated by the traditional electromagnetic motor is avoided from the source, meanwhile, the sound control sensor is used for monitoring the noise condition of the surrounding environment in real time, and when the noise exceeds a preset threshold value, a variable-frequency electric appliance in the feedback control assembly feeds back signals according to the sound control sensor; according to the utility model, the signal output to the vibration frequency speed regulation plate is adjusted, and then the current frequency output to the ultrasonic motor is adjusted in real time, and the vibration frequency of the vibration rod is changed, so that the purpose of reducing noise is achieved, the noise can be controlled at a lower level even in high-strength vibration operation, and the influence on the surrounding environment and constructors is greatly reduced.

The invention relates to the technical field of chemical equipment, and discloses a quick assembly device and a quick assembly method of a modular ammonia still tray and an ammonia still system. The quick assembly device comprises a tower body, a maintenance channel, a treatment cover and a push-out mechanism. A tower tray capable of horizontally moving is arranged in the tower body, a maintenance channel with a detachable cover is arranged on the side wall of the tower body, the treatment cover is fixed on the outer wall of the tower body and is communicated with the maintenance channel, and a treatment cavity is formed in the treatment cover; the push-out mechanism is located on the side, opposite to the maintenance channel, of the tower tray in the tower and comprises a pushing block and a driving piece. And when the opening cover is opened, the driving piece drives the material pushing block to push the tray into the processing chamber through the maintenance channel. According to the device, the tray is laterally moved out, so that non-entering type rapid maintenance is realized, the production interruption time is reduced, the safety risk that personnel enter a limited space for operation is avoided, and the maintenance labor intensity is reduced.

The application relates to the technical field of household appliances and discloses a pipeline system which comprises a refrigerant pipe, a fixed adhesive block, an adhesive block adjusting mechanism, a vibration sensor, a compressor frequency determining module and a controller assembly. The controller assembly is connected with the adhesive block adjusting mechanism, the vibration sensor and the compressor frequency determining module, and is used for controlling the adhesive block adjusting mechanism to adjust the hardness of the fixed adhesive block according to the vibration frequency of the pipeline system detected by the vibration sensor and the compressor operating frequency obtained by the compressor frequency determining module. The hardness of the fixed adhesive block is adjusted according to the frequencies of the refrigerant pipe and the compressor, so that the vibration frequency of the pipeline system is avoided from the frequency of the compressor, resonance between the refrigerant pipe and the compressor is avoided, the vibration amplitude of the refrigerant pipe can be effectively reduced, noise can be reduced, and the stability of the whole pipeline system is improved. The application further discloses a control method for preventing resonance of the pipeline system.