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 motor acceleration and deceleration control method and a three-dimensional pipette device. The motor acceleration and deceleration control method comprises the following steps: a target speed parameter and a target moving distance are acquired, and a target pulse number is obtained according to the target moving distance and a preset relation function; a motion control mode of a motor is acquired according to the target pulse number, the target speed parameter, a preset speed parameter array curve and a pulse number array curve; the current pulse number corresponding to motor operation is read; if the motion control mode contains a constant speed mode, the motor is controlled to be accelerated to the speed corresponding to the target speed parameter, operate constantly at the speed corresponding to the target speed parameter and finally be decelerated to operate to a preset lowest speed; if the motion control mode does not contain the constant speed mode, the motor is controlled to perform accelerated operation and then perform decelerated operation to the preset lowest speed. Therefore, the control way is simple, easy to implement and high in precision.

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.

The invention discloses a method for non-blasting rock hole excavation construction of a water grinding drill. The method of "peripheral drilling for core and cutting surrounding rock + central drilling and block splitting" is used for performing the tunnel non-blasting rock excavation method; under the original conditions without disturbing the surrounding rock, the water grinding drill is used to drill for core along the upper half hole designed contour line of the flat hole, and the diameter of the hole is 150-180mm, the drilling depth is 50-80cm, and the hole is drilled continuously to form a groove, so that the rock in the face and the surrounding rock of the mountain are separated to form an excavation outline, and at the same time, the temporary surface is provided for the separation of the rock in the face. The pre-splitting hole is drilled in the rock in the face by region, the pre-splitting hole is still drilled with the water-grinding drill, and the drilling depth is 50-80cm. The holes are arranged in layers from top to bottom. The rock on the face is divided into uniform blocks according to the rock hardness, and the specific block size can be determined according to the slag transport conditions and equipment. The invention provides the method for non-blasting rock hole excavation construction of the water grinding drill with convenient construction, no need for large construction machinery and simple process.

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.

A crankshaft has a helical drive gear formed as one of the crank webs at an end portion thereof. Another crank web outside of the drive gear is made in two parts, an integral balance weight mounting portion and a removable balance weight. In one embodiment, a crankshaft 12 features a crankshaft body 33 including a gear 24 for outputting rotation formed on one side of a crankpin 17d. The crankshaft also includes a first balance weight mounting portion 30g formed on the other side of the crankpin 17d and a first balance weight 31g to be mounted to the first balance weight mounting portion 30g. The crankshaft body 33 may be formed with a second balance weight mounting portion 30a separately from the first balance weight mounting portion 30g, and a second balance weight 31a mounted to the second balance weight mounting portion.

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 discloses an environment-friendly, sanitary and saving type meat breeding duck fermentation bed raising house and belongs to the technical field of poultry raising. The environment-friendly, sanitary and saving type meat breeding duck fermentation bed raising house is mainly characterized in that a breeding duck shed comprises a bottom inflation fermentation bed, and the bottom inflation fermentation bed comprises a fermentation bed cushion layer and an inflation fermentation system below the fermentation bed cushion layer; the fermentation bed cushion layer comprises a surface layer discrete padding layer with the thickness of 20 cm and a lower layer straw layer with the thickness ranging from 15 cm to 20 cm; the inflation fermentation system comprises an inflation power device and an inflation pipeline device connected with the inflation power device and located below the cushion layer. Due to the environment-friendly, sanitary and saving type meat breeding duck fermentation bed raising house, the problem that fermentation bed padding hardens because of biological characteristics of ducks is effectively solved, the aerobic degradation capacity of fermentation bed padding for dung of the breeding ducks is improved, emission of foul gas and greenhouse gas is reduced, and the aerobic degradation capacity for dung of the breeding ducks is improved; the water requirement in the drought raising stage is met by a drinking device and a spraying cleaning device, and meanwhile, consumption of water sources is reduced.

The invention relates to a drop impact testing machine for large dangerous cargo transporting package containers. The upper ends of two support upright posts are connected with a fixed cross beam to form an n-shaped frame, and the lower ends are respectively fixed with one fixing plate. Two screw rods are respectively arranged at the inner sides of the two support upright posts, and are parallel with the two support upright posts and fixed between the fixed cross beam and the fixing plate to freely rotate. The inside surfaces of the two support upright posts are respectively fixed with a guide rail, and two slide blocks are respectively fixed at both ends of a movable cross beam and arranged on the two guide rails. The two screw rods penetrate through the through holes at both ends of the movable cross beam. Two servo motors are respectively fixed on two speed reduction boxes, and the two speed reduction boxes are respectively fixed at the lower ends of the two sides of the movable cross beam, and sleeved on the two screw rods by threads. A release device is fixed at the center of the lower end surface of the movable cross beam. A testing and controlling device is arranged in a groove of the movable cross beam. The testing machine realizes automation of the hanging / dropping complete process of the packaging piece with the weight of 20 kilograms to 2 tons, has the advantages of convenient operation, good lifting stability, low mechanical noise and high accuracy, eliminates the safety hazard caused by manual operation, and can be widely applied to testing various large-weight cargo packages.

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 bearing-free permanent magnetic synchronous generator. A permanent magnetic rotor is coaxially sleeved with a stator iron core, the stator iron core is evenly provided with 36 stator grooves in the circumferential direction, and each stator groove is internally provided with an inner layer winding and an outer layer winding. Each outer layer winding is composed of two pairs of pole generation windings, the number of stator grooves of each pole and each phase is three, and each inner layer winding is a pair of pole suspension force windings and two pairs of pole excitation windings. The generation windings are distributed according to an A1+ phase, a B1- phase, a C1+ phase, an A1- phase, a B1+ phase, a C1- phase, an A2+ phase, a B2- phase, a C2+ phase, an A2- phase, a B2+ phase and a C2- phase in the clockwise direction. The suspension force windings are distributed according to an a+ phase, a b- phase, a c+ phase, an a- phase, a b+ phase and a c- phase in the clockwise direction. The excitation windings are distributed according to an X1+ phase, a Y1- phase, a Z1+ phase, an X1- phase, a Y1+ phase, a Z1- phase, an X2+ phase, a Y2- phase, a Z2+ phase, an X2- phase, a Y2+ phase and a Z2- phase in the clockwise direction. Operation reliability of a motor under special working conditions is improved.

The invention relates to a pulse width modulation (PWM) control circuit of an elevator brake. The PWM control circuit comprises an electro-magnetic interference (EMI) filter, an alternating current / direct current converter, a high-end power switching circuit, a low-end power switching circuit, a pulse width modulation circuit, an excitation voltage regulation feedback circuit, a sustaining voltage regulation feedback circuit, an excitation control circuit, a residual magnetism removal control circuit, a freewheeling circuit, a bleeder circuit, a direct current power supply and the like. The PWM control circuit adopts a pulse width modulation mode to control the direct current working voltage of the elevator brake, thereby eliminating electromagnetic noise of the elevator brake, and improving the working stability, reliability and interference resistance of the elevator brake. The PWM control circuit can be used in various elevator brakes with different structures and other electromagnetic brakes, and can be provided with various backup and online uninterrupted power supplies (UPS).

The invention discloses a plug seedling precision seeder, which comprises a vibrating platform module. The vibrating platform module comprises a piezoelectric element and a narrow seed tray of which the size satisfies the seed suction requirement of the first and second rows of holes on a seed sucking tray; the piezoelectric element is installed on the narrow seed tray and externally connected with a drive power source. The plug seedling precision seeder disclosed by the invention has the advantages of: reducing the size of the seed tray, saving the cost, solving the problem that the seeds cannot be sucked because of deflective concentration of the seeds, greatly reducing the power consumption and various noises such as electromagnetic noise, pneumatic noise and mechanical noise, easily achieving reliability control and regulation, greatly increasing the service life and safety, and ensuring that the position of a dribbling head of a dribbling mechanism and the positions of the seed sucking holes are respectively corresponding to the positions of the seed discharging holes on the plug via concentrated driving so as to finish the precise seeding process of the seeder. The plug seedling precision seeder is benefit for application and popularization, saves a great amount of labor and materials, improves the work environment and labor intensity of technicians for planting, and achieves good economic and social efficiencies.

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 a microgravity testing device based on a quartz flexible accelerometer. The microgravity testing device comprises a quartz flexible accelerometer assembly, a sampling circuit, a filter circuit, a gating circuit, an analog / digital (A / D) conversion circuit, a communication interface circuit and a field programmable gate array (FPGA) controller. The quartz flexible accelerometer assembly comprises the quartz flexible accelerometer and a temperature control system which comprises a temperature control circuit, a heating element, a heat preservation cover, an installation base body and a base. The microgravity testing device based on the quartz flexible accelerometer has the advantages of being low in noise, large in range, wide in transmission band, and capable of avoiding data loss caused by frame dropping, frame emptying, frame repetition, error codes and the like, and improving reliability of data.

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 discloses a low-noise self-priming combined pump. According to the low-noise self-priming combined pump, diffusion guide vanes and a guide disc of a traditional self-priming jet pump are removed, a single-baffle-tongue single-outlet centrifugal vortex chamber or a multi-baffle-tongue multi-outlet centrifugal vortex chamber which is higher in hydraulic performance and efficiency is adopted, a single entry type runner is designed, centrifuged and accelerated fluid is reasonably guided into a distribution pumping chamber or a distribution tee joint, scraping among the guide vanes, the guide disc and a centrifugal impeller and strong impact of the high-speed fluid to the guide vanes and the guide disc are eliminated essentially, transitional flowing between the centrifugal vortex chamber and the distribution pumping chamber or the distribution tee joint is more smooth, and the flowing losses and flowing noise are lower. Through the reasonable arrangement of the single entry type runner, continuous supply of the working fluid at the inlet section of a spray nozzle can be guaranteed, so that negative pressure is maintained, and strong self-priming capacity is obtained. The traditional large-sized distribution pumping chamber can be replaced with the distribution tee joint, and thus the structure is more compact.

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.