354results about How to "Reduce mechanical noise" patented technology

The invention relates to a household stone milling machine comprising a power mechanism, a driving mechanism, a milling mechanism, a vortex mechanism and a cup. The power mechanism comprises a motor and a speed reducer; the driving mechanism comprises a driving shaft and a stable driver; the milling mechanism comprises a movable milling disc, a fixed milling disc, a movable milling disc driving shaft sleeve, fixed milling disc bearing and a material guiding slot chiseled in the fixed milling disc; and a vortex generator comprises a vortex fan and a vortex gathering cover. The household stone milling machine is characterized in that the vortex fan is arranged below the milling mechanism, is immersed in water and is fixed on the driving shaft, the vortex gathering cover is sleeved outside the vortex fan, the vortex fan rotates along with the driving shaft to generate the vortex in water under the cooperation of the vortex gathering cover, and the vortex with the mixture of material and water enters the milling mechanism along the material guiding slot to fine mill the material in a circulatory way. The household stone milling machine is suitable for the household use, has good milling effect, can enable all the nutrients in the material to be released by generating less dregs, can effectively prevent the nutrients from being damaged and can mill the nutritious and health soybean milk and the juice with good taste.

The invention relates to a metal/ceramic nano complex self-repairing additive, which comprises metal nano micropowder and nano natural ore powder as main material, detergent, catalyst, antioxidant, and solvent, and can be used in lube, grease and ultrasonic medium. The advantages of this invention include: it can form rapidly high-hardness self-repairing protection layer on a plurality of metal friction surfaces with thickness adjustable to optimize gap and improve surface physical and chemical property, and has wide application in friction dual parts.

In order to provide an electric heat system that is quieter than those of the prior art, a switching circuit is incorporated into the controls for the heating system which provides for the heating elements of the electric heater to be kept at a more constant temperature than those of the prior art. The switching circuit regulates the output power to the degree desired while not inducing sharp changes in temperature of the coils of the electric heater and thus reduces the degree of rapid expansion and contraction of the coils and the enclosure for the heater. This in turn reduces the amount of mechanical noise produced by the electric heater while also reducing wear and tear on the heating element, the heater enclosure and objects near to the heater.

The present invention is directed to support members for assemblies of conductors, conduits, or other means of conveying energy, gases, or liquids. The invention has a series of non-interlocking solids disposed along the length of a flexible base material. The non-interlocking solids have motion-limiting portions that contact similar portions on adjacent solids to restrict the movement of the support member in one direction, while permitting the support member to curve or bend in an opposite direction. The invention is also directed to assemblies incorporating the support members.

A monitoring device with a pedometer is disclosed herein. The monitoring device preferably comprises an article, an optical sensor, an accelerometer and processor. The optical sensor preferably comprises a photodetector and a plurality of light emitting diodes. A sensor signal from the optical sensor is processed with a filtered accelerometer output signal from the accelerometer to generate a pedometer function.

The synchronous motor driving apparatus including position sensors provided in the synchronous motor, a current polarity detection circuit for detecting the polarities of the currents in the respective phase windings of the synchronous motor, an inverter driving the synchronous motor, a motor speed calculation unit calculating the rotational speed of the synchronous motor depending on the output signals from the position sensors, a speed control unit outputting a first voltage adjusting component (q-axis current command value Iq*) to cause the rotational speed of the synchronous motor to approach a speed command value and a phase control unit outputting a second voltage adjusting component (d-axis current command value Id*) to cause the phase differences between the phases of the position sensor signals and of the currents in the respective phase windings of the synchronous motor to become a predetermined value.

The invention belongs to the technical field of air compressors, and relates to a low-noise structural oilless air compressor which comprises a cylinder, a cylinder cover and a piston, wherein the piston is provided with a sealing ring or a sealing leather cup made of a self-lubricating material, a crankcase is tightly connected with a crankcase cover plate and forms a crankcase intake muffler, an air intake one-way valve is arranged at an air intake or an air intake passage of the crankcase intake muffler communicated with the outside atmosphere, a damping pad is arranged between an exhaust valve plate and a valve seat, the valve seat is connected with a silencing cap, a crank pin is made into the shape of a spline or similar to the spline, a heat insulation hole or a heat insulation slot is arranged on a connecting rod body, and a heat insulation pad is arranged at the joint of a fastening bolt and the piston or a connecting rod. The low-noise structural oilless air compressor has the advantages that the air intake noise is low, the working temperature and the mechanical noise of a bearing are low, and an auxiliary balance block is arranged on a cooling fan, thereby reducing the vibration amplitude of the compressors, and effectively reducing the body vibration noise.

The invention discloses a wall-hung thin type lampblack depurating machine, which is provided with flat cuboid-shaped shell, wherein a double-volute is arranged in the shell, and two isolated chambers of the double-volute share an air outlet passage on the top of the shell; a turbo-fan with a horizontal output shaft is arranged in the two isolated chambers of the double-volute respectively, and the front end of the output shaft of the turbo-fan extends out of the double-volute and is connected with at least one vertical rotary centrifugal filter screen plate; and the outside of the rotary centrifugal filter screen plate is provided with an annular oil guide ring, the bottom of the annular oil guide ring is provided with an oil leak opening, a fume flow distribution plate is arranged below the annular oil guide ring, an oil guide tank is arranged on the fume flow distribution plate, and the bottom of the shell is provided with an air inlet passage and an oil collection box. The wall-hung thin type lampblack depurating machine has ultra-high efficiency for holding up and collecting lampblack, can basically put an end to the pollution caused by the lampblack to the air, the shell and the external wall of a building, and has the characteristics of overall closure, simple structure, convenient cleaning, energy saving and noise reduction, large cooking space, safe running and long service life.

The invention relates to a mechanical lubricating grease, in particular to a sodium aluminate soap grease for a ship. The sodium aluminate soap grease comprises the following components in parts by weight: 4-12 parts of stearic acid, 3-9 parts of hardened oil, 5-15 parts of oleic acid, 3-15 parts of white alum, 1-5 parts of NaOH, 1-5 parts of 50# machine oil and 80-90 parts of 60# cylinder mixed oil. The sodium aluminate soap grease for the ship is suitable for a ship propeller, a floating crane and a dredge boat, the dropping point is above 75 DEG C, the sodium aluminate soap grease has good water resistance, protective property and anti-corrosive performance, the sodium aluminate soap grease not only has the function of proper lubrication, but also has the anti-corrosion performance, and has the function of reducing the mechanical noise.

An electronic percussion instrument includes a head, a frame, and an impact sensor. The back of the head is divided into a main area (e.g. a main strike area) and an auxiliary area. At least one connecting part is arranged above or below the main area in the back of the head and reduced in thickness compared to the auxiliary area, thus reducing vibration from being transmitted through the head. The impact sensor is attached to the back of the main strike area of the head via a cushion member. When the main strike area of the head is being struck with a beater, a vibration is caused to occur in the head and detected by the impact sensor to produce an electric signal which is used to generate an electronic musical sound while suppressing mechanical noise due to an impact between the beater and the head.

The invention relates to a low enthalpy arc heater airflow enthalpy diagnosis system and diagnosis method. The method is characterized in that the near-infrared laser absorption spectrum diagnosis technology is utilized to directly measure flow field parameters of the free flow of an arc heater nozzle outlet, based on H2O double-wire temperature measurement, the airflow temperature and the velocity of the free flow of the arc heater nozzle outlet are obtained, in combination with the quantitative relationship among the heat balance airflow enthalpy, the temperature and the pressure, the totallocal airflow enthalpy at the nozzle outlet is obtained. The method is advantaged in that enthalpy measurement precision is improved, the method is applicable to measurement of the airflow enthalpy ofvarious types of low enthalpy arc heaters such as tubular, AC and long section heaters within the enthalpy range of 1500-7500kJ/kg; the method is a non-contact measuring method, interference on the flow field is avoided, the method does not depend on other measurement parameters and machining precision, accurate measurement of the flow field parameters can be realized, and the method can be usedas a powerful complement to enthalpy measurement methods in the prior art.

The invention relates to an electric-driving transmission device for an electric vehicle and a control method. The electric-driving transmission device comprises a driving motor, a differential mechanism, a first brake, a second brake, a first planetary gear set and a second planetary gear set, wherein the first planetary gear set comprises a first sun wheel, a first planet carrier and a first gear ring, and the second planetary gear set comprises a second sun wheel, a second planet carrier and a second gear ring. An output shaft of a driving motor is sequentially connected with the first sunwheel and the second sun wheel. The first gear ring is connected with the first brake, and the second gear ring is connected with the second brake. The first planet carrier and the second gear ring are connected to form a whole, the second planet carrier is provided with an output support, and the output support is connected with an input shaft of the differential mechanism. Compared with the prior art, the electric-driving transmission device can achieve non power failure in the gear shifting process, is low in control complexity, has relatively low requirements for performance of the drivingmotor, and is high in practicability, compact in structure, small in size, low in weight and low in manufacturing cost.

An air filtering apparatus includes a housing defining a top opening and having a front portion defining a bottom opening. A filter is positioned within the top opening and sealed to the housing so that air flowing into the housing passes through the filter. An expansion chamber is in fluid communication with the bottom opening. A motorized fan is located within the housing and is configured for drawing air through the filter, into the housing and out through the expansion chamber. The air output of the motorized fan is directed toward a bottom of the housing proximate a rear of the housing with the expansion chamber extending from the air output of the motorized fan to the front portion of the housing.

An electronic percussion instrument includes a head, a frame, and an impact sensor, and a plate serving as a vibration-damping member. The back of the head is divided into a main area (e.g. a main strike area) and an auxiliary area. The plate is ring-shaped sheet, made of a harder material (e.g. a metal) than the head, with an elongated hole and attached to the head to encompass or sandwich the main strike area of the head, thus demonstrating a vibration-damping effect. When the main strike area of the head is being struck with a beater, a vibration is caused to occur in the head and detected by the impact sensor to produce an electric signal which is used to generate an electronic musical sound while the vibration-damping member suppresses vibration being transmitted through the head due to an impact of the beater on the head.

The invention relates a continuously variable transmission driving system for magnetic gear transmission. The continuously variable transmission driving system comprises a magnetic gear and two permanent magnetic motor, wherein, one permanent magnetic motor is integrated with the outer gear of the magnetic gear and is connected with an output shaft; a magnet adjusting ring at the middle part of the magnetic gear is connected with a rotor of the other permanent magnetic motor and the rotate speed of the rotor is controllable; the inner ring of the magnetic gear is connected with a shaft of an engine for inputting the mechanical energy of the engine and the mechanical energy is output through the outer gear of the magnetic gear. By combining the two motors and the magnetic gear, the continuously variable transmission driving system can easily output high torque and realize the continuously variable mechanical energy transmission without contact and friction.

The invention discloses a control method of an air conditioner, a control device of the air conditioner and the air conditioner. The air conditioner comprises a coolant system, a throttle device and a variable frequency compressor; the coolant system is connected with an indoor-outdoor heat exchanger; the throttle device is connected with the indoor-outdoor heat exchanger; the variable frequency compressor drives coolant to circulate. The control method includes the steps of controlling the variable frequency compressor of the air conditioner to start with a first frequency when the air conditioner is in a silent mode; with a first preset time passing by, controlling the variable frequency compressor to increase in frequency at a first preset rate; judging whether or not current frequency of the variable frequency compressor reaches a value corresponding to a set noise value set in the silent mode; if yes, controlling the variable frequency compressor to stop increasing in frequency. The control method according to the embodiment has the advantages that flow of the coolant and impact thereof can be effectively reduced, leading to reduced coolant noise and mechanical noise, interference is avoided for users, and user experience is improved.

The invention discloses an air conditioner and a control method and device thereof. The air conditioner comprises a coolant system, a throttle device, an outdoor fan and a variable frequency compressor; the coolant system is connected with an indoor-outer heat exchanger; the throttle device is connected with the indoor-outdoor heat exchanger; the variable frequency compressor drives coolant to circulate. The control method includes the steps of controlling the variable frequency compressor of the air conditioner to start with a first frequency when the air conditioner is in a silent mode; with a first preset time passing by, controlling the variable frequency compressor to increase in frequency at a first preset rate; judging whether or not the flow of the coolant reaches first preset flow; if yes, controlling the variable frequency compressor to stop increasing in frequency. The control method according to the embodiment has the advantages that flow of the coolant and impact thereof are effectively reduced, leading to reduced coolant noise and mechanical noise, interference is avoided for users, and user experience is improved.

The invention relates to a compound grease additive, which is characterized by including graphite, a base oil, a dispersing agent, a thickening agent and an extreme pressure antiwear additive, and the composition of the raw materials by weight percentage is as follows: 20 to 50 percent of the graphite, 1 to 10 percent of the dispersing agent, 5 to 10 percent of the thickening agent, 10 to 30 percent of the extreme pressure antiwear additive, and the residue is base oil; the sum of the component percentage of all the raw materials is equal to 100 percent. The compound grease additive of the invention has low cost, can obviously enhance the functionalities of abrasion resistance and ultimate working capacity, etc., obviously reduce the usage amount of the grease, prolong the service cycle of the grease, and is environment-friendly.