487results about How to "reduce vibration" patented technology

The invention discloses a fracturing manifold quick connecting device. A first movable elbow, a linear pipe, a second movable elbow, a plug valve and a check valve are connected in sequence. A supportis fixedly connected with the second movable elbow. One end of an oil cylinder is connected with the linear pipe. The other end of the oil cylinder is connected with the support. The oil cylinder candrive the linear pipe to rotate around the second movable elbow. A control unit controls the oil cylinder through a hydraulic system, and accordingly, rotation of the linear pipe is controlled. The fracturing manifold quick connecting device has the beneficial effects that a one-way valve enables one-way flowing of fracturing fluid from fracturing equipment to a manifold package to be achieved, the situation that reflux of the fracturing fluid damages the fracturing equipment is avoided, the one-way valve can further gather fluctuation caused by a pressure difference to the position where thequick connecting device is connected with the manifold package, vibration of the whole quick connecting device is reduced, and the service life is prolonged; the plug valve achieves on-off of drainage of the single fracturing equipment, and the maintenance cost is lowered; and the hydraulic system achieves automatic adjustment of the quick connecting device, no manual uplifting or pressing is needed, the control unit enables remote control to be achieved, time and labor are saved, and the manual operation difficulty is lowered.

A medical device, such as a respiratory treatment device, includes a passive acoustic noise reduction system in the form of a vibration reducing blower assembly isolation mount. The device includes a housing, a blower assembly mounted therein, a patient circuit coupled to the blower assembly, and a noise reducing blower assembly isolation mount. The mount includes a first vibration damping member adjacent one side of the blower assembly spacing the blower assembly from a mounting surface upon which the blower assembly is supported. A securing member positions and holds the blower assembly onto the mounting surface, and a second vibration damping member adjacent an opposite side of the blower assembly spaces the blower assembly from the securing member. The vibration damping members are injection molded thermoplastic elastomeric members.

A startup control method of a BLDC motor is disclosed. The method can control the BLDC motor to prevent the generation of a transient current such that the vibration of the BLDC motor can be reduced at the startup stage and perform a stable conversion into a senseless operation mode such that the startup failure rate of the BLDC motor can be reduced. The startup control method includes commutating a current applied to stator windings according to a rotor position. The method of operating the BLDC motor includes a rotor position that is forcibly aligned and so that phase commutation is performed, a back-electromotive force (back- emf) is detected from a lead voltage of a phase of a voltage which is not applied thereto after performing phase commutation and a determination is performed as to whether the detected back-emf is in a rising interval. The lead voltage of the phase of the voltage which is not applied thereto is integrated, such that if the back-emf is in a rising interval and if an instance that the integration result is greater than a predetermined value a phase commutation time point is setand conversion into a senseless operation mode is performed if the back-emf detected from the lead voltage is in a stable interval, based on a frequency of the voltage applied to the stator winding.

The invention discloses a method for automatically compensating compressor moment. The method for automatically compensating the compressor moment comprises the following steps of obtaining the target speed and the feedback speed; generating the fluctuation speed according to the target speed and the feedback speed; utilizing a PLL mode to generate a moment compensating angle according to the target speed and the fluctuation speed; obtaining a loading moment reference value and generating a moment compensating amplitude value according to the loading moment reference value; generating a feedforward moment compensating value according to the target speed, the moment compensating angle and the moment compensating amplitude value. By adopting the method for automatically compensating the compressor moment, a loading moment angle and a loading moment amplitude value can be tracked in real time, the debugging time for moment compensation is greatly reduced, and the optimal compensation effect is achieved in a full-working-condition range of a compressor. The invention further discloses a compressor control method, a device for automatically compensating the compressor moment and the compressor provided with the device.

A quiet motorized roller shade assembly has a roller tube for reeling and unreeling a reelable shade and an internal electric motor. The motor turns a drive wheel that mates with a the interior of the roller tube so that the roller tube rotates in response to the rotation of the drive wheel. The electric motor disposed within a motor sleeve for reducing sound transmission within the roller tube. A crown is disposed on one end of the roller tube. The drive wheel and the crown maintain a space between the electric motor and the roller tube so that the motor does not directly contact the roller tube. An idler assembly is disposed proximate the end of the roller tube opposite the crown. The idler assembly includes a spring member for reducing vibration between roller shade assembly and the mounting bracket during operation of the electric motor.

The invention belongs to the technical field of tunnelling of full fracture surface rock tunnelling machines and provides a design method for a cutter head of a laser full fracture surface rock tunnelling machine. A combination of a laser and a high-pressure water jet is adopted to break rock, the rock breaking mode of the cutter head is not dependent on the rolling effect of a hob and rock, therefore, a center plate on a traditional cutter head is removed, a laser device and a high-pressure water gun are driven by different shafts correspondingly, after the rock is treated by the laser, the rock surface is immediately sprayed through the high-pressure water gun, and then the remaining rock is treated through an edge scraper, so that the purpose of rock breaking is achieved. The cutter head does not make contact with the rock surface for most of the time, so that compared with the traditional cutter head, the vibration amplitude of the cutter head can be greatly reduced; molten slag and rock slag can be effectively removed and the high temperature caused by the laser can be reduced due to the existence of a high-pressure water flow; and the cutter head is not provided with the center plate, so that the water flow entrained waste slag can be conveniently discharged out of a working area.

A motor including a stator, a rotor, and a current supply unit. The stator includes a stator core, which has a plurality of teeth, and a plurality of coils, which are wound around the teeth. The rotor includes a plurality of magnets, which function as first magnetic poles, and salient poles, which function as second magnetic poles. Each of the salient poles is arranged between adjacent magnets spaced apart by a clearance from the magnets. When P represents the number of poles in the rotor and S represents the number of coils, a ratio P/S of the pole number P and the coil number S is represented by (4n−2)/3m (where n and m are integers that are greater than or equal to 2). The plurality of coils includes a plurality of coil groups including coils for three phases. The current supply unit executes a different current control for each coil groups.

The invention discloses a transportation device for communication equipment, which comprises a box body, a shockproof plate and a main body of the equipment. The inside of the box body is provided with a shockproof plate, the top of the shockproof plate is provided with a main body of equipment, and the inner bottom of the shockproof plate and the box body is provided with a Evenly distributed second springs, the inner bottom of the box is provided with two symmetrical rectangular chutes, and the inside of the rectangular chute is slidingly connected with two symmetrically distributed sliders, and the top of the sliders is hinged with a second connecting rod , the other ends of the second connecting rods are hinged on the bottom end of the shockproof plate, and the two second connecting rods are arranged in a figure-eight shape, and the sides of the two sliders far away from each other are connected with second teeth arranged horizontally One end of the bar and the second rack bar extends to the outside of the box body, and the interior of the rectangular chute is symmetrically provided with fixed blocks, and the fixed blocks are all slidably connected with the second rack bar. The device has a simple structure, is easy to produce, and at the same time has low production cost, has a good shock-absorbing protection function, and has high safety.

A tube bundle device having at least one displaceable baffle which supports the tubes in the bundle device is disclosed in order to reduce tube vibration. The displaceable baffle includes at least two displaceable portions, which can be moved to installed position such that tubes in a tube bundle are deflected.

A vacuum hold-down device comprising a base member (1) and a separate workpiece support (8) which co-operate to define a vacuum chamber. The device further comprises a venturi (15) having an inlet port (7) for connection to a source of pressurized fluid, an outlet (9) for fluid from the venturi, and a fluid connection (19, 5) from a low pressure region of the venturi (15) to the inside of the vacuum chamber, for providing a partial vacuum therein. The partial vacuum will hold the base member (1) and the workpiece support (8) together to maintain a peripheral seal therebetween. The workpiece support (8) is provided with securing means (16) for securing a workpiece (10) thereon. The invention also provides a vacuum hold-down system comprising the base member (1) and a plurality of interchangeable workpiece supports (8).

The present invention relates to a control method of frequency conversion air conditioner capable of reducing vibration produced by low-speed operation of air conditioner. It is characterized by that when the temperature difference of the set temperature set by user and indoor temperature is less than rated temperature, at the same time of utilizing a certain operation frequency to operated compressor it can output energy efficiency compensation rate according to the operation frequency of compressor rotation interval load, and can utilize first operation frequency produced by changing rotation interval energy efficiency according to the energy efficiency compensation rate to operate compressor.

A duel-cylinder reciprocating rocking piston-type compressor is disclosed with side foot mounts resulting in reduced compressor vibration and noise. An optimum vertical height for the foot mounts as well as an optimum lateral or axial position along the compressor body relative to the piston connecting rod are also disclosed. Specifically, the side foot mounts are mounted to the housing at a height falling in the range of 0.5 times the height of the drive shaft to about 1.5 times the height of the drive shaft. Further; an elevated o-ring gland or gasket is disclosed for sealing the heads to the valve plates. Still further, and improved valve plate design is disclosed that includes substantially flat valve plates, monolithically connected together through a raised central portion that defines tubes or passageways connecting the intake and output chambers associated with each cylinder. The result is a compressor with a shorter vertical height, that is lighter and that produces less noise and vibration without compromising output.

The invention discloses an ore cutting device with dust removal function, which comprises a dust collecting device and a cutting table, a baffle plate and a fixed base are installed above the cutting table, and a dust suction pipe is arranged on the left side of the baffle plate. A blower is arranged on the right side of the baffle, a crossbeam is installed above the fixed base, a mobile frame is installed above the crossbeam, an electric telescopic rod is connected below the mobile frame, and an electric telescopic rod is connected below the electric telescopic rod. A rotating block is installed, a cutting device is installed under the rotating block, a cutting knife is installed inside the cutting device, a supporting plate is installed under the cutting device, and a shock absorbing device is passed between the cutting table and the base connection, a control box is installed above the base, a motor unit is installed inside the control box, a support frame is installed above the control box, and a stone is placed on the right side of the support frame. The invention has the advantages of simple structure, reasonable design and simple operation, and is worth popularizing.

An electric treadmill with a folding mechanism includes a handrail frame pivotably mounted at both sides of the front end of the base frame. A guide plate having a sliding groove, two link plates, and a positioning plate attached to the handrail frame are provided between both sides of the base frame and the handrail frame. The guide plate is connected to a sliding support of a ground-touching roller. The sliding support is pivotably coupled to the bottom of the base frame. According to the assembly of the above-mentioned components, when the base frame is lifted in a folded position, a slide pin of the link plates is movable in the sliding groove of the guide plate until the base frame is folded in an upright position.

A vibration damping device having a mass member elastically supported via a spring member on a vibrating member to be damped thereby constituting a secondary vibration system for the vibrating member. The spring member comprises a plurality of rubber elastic bodies being positioned in a parallel arrangement along a vibration input direction, and the mass member is elastically supported at multiple spring support points formed by the plurality of rubber elastic bodies such that a center of gravity of the mass member is positioned between the multiple spring support points and away from a combined elastic center axis of multiple spring support points so as to establish multiple natural frequencies in the vibration input direction, and such that the multiple natural frequencies are tuned to multiple vibration frequencies to be damped in the vibrating member.

A magnetic suspension bearing with damping system includes a stator having a stator magnetic unit mounted on the internal portion of the stator, and a rotor rotatably located at the stator. A rotor magnetic unit installed on the rotor corresponding to the stator magnetic. The rotor further has a yoke having a magnetic driving unit corresponding to the external portion of the stator. A magnetic damping device located has a magnetic unit and an elastic unit, wherein the magnetic unit corresponding to the magnetic driving unit generates magnetic force between them, and the elastic unit coupled below the magnetic unit uses to reduce the vibration of the magnetic unit for maintaining the rotation of the rotor smooth and steady.

An electric motor such as a driving source of an electric vehicle is controlled by the microcomputer 7. The microcomputer 7 calculates a target torque Req_trq according to a throttle opening degree α, and outputting induction values (a current instruction value I and a angle instruction value θ) obtained referring to a map MP based on the target torque Req_trq (a motor rotational number Nm and a battery voltage Vb), the microcomputer 7 performs a torque control of an SR motor 3. The motor rotational number Nm detected from the SR motor 3 is passed through a band pass filter 51. Passing by the band pass filter 51, a signal data of the extracted 0.1-50 Hz is executed a PD calculation process 52, the calculated corrected amount PD_out is subtracted from the target torque Req_trq.

The invention provides a tube-shell heat exchanger. The tube-shell heat exchanger comprises a housing, wherein sealing heads are arranged at two ends of the housing; tube plates are arranged at positions where the sealing heads are connected to the housing; heat exchange tubes are connected to the tube plates at two ends; gas phase in gas-liquid two-phase current is insoluble or slightly-soluble gas, namely, gas cannot dissolve in liquid in the heat exchanging process. The tube-shell heat exchanger is characterized in that current stabilizers for absorbing vibration and reducing noise are arranged in the heat exchange tubes; a plurality of current stabilizers are arranged in one heat exchange tube; the spacing between adjacent current stabilizers gradually increases in the flowing direction of the liquid in the heat exchange tubes until reaching some position, and then the spacing between the adjacent current stabilizers gradually decreases from the some position. According to the heatexchanger, the vibration of pipelines can be minimized based on the spacing change of the current stabilizers while the pipelines are subjected to gas-liquid two-phase flowing, and moreover, the noise level is decreased, and meanwhile, the flowing resistance is reduced.

The present invention pertains to a tunnel excavation device, which includes an excavation head, a main body on which the excavation head is rotatably mounted, a motor provided in the main body and rotates the excavation head, and a controller for controlling the motor, wherein the excavation head includes a perforating means formed by maintaining a predetermined interval from the center of a body part, which has a front surface formed in the shape of a circular plate, to the outer surface of the body part, an injection means for injecting water and liquid nitrogen into the hole formed by the perforating means, and a plurality of cutters provided on the surface of the main body for crushing the bedrock. According to the present invention, the perforating means such as a laser drill or the like forms a hole and water and liquid nitrogen are injected into the hole so as to crush the bedrock when the excavation work is carried out. Therefore, vibrations, noise and the dust may be reduced around the work site, and the progress speed of processes may be increased. In particular, the one day excavation distance becomes longer than the conventional TBM (tunnel boring machine) such that the entire tunnel construction period is reduced. Furthermore, the lifespan is elongated due to prevention of the abrasion of a cutter such that the cutter replacement time becomes longer, and the maintenance costs can be reduced.

The invention provides a smashing and drying device for rubber production. The smashing and drying device comprises a box body, a smashing device, two drying chambers and a motor chamber, wherein a feed hopper and discharge pipes are arranged on the box body; the smashing device comprises a left smashing roller, a right smashing roller, side plates and an intermediate plate; the left smashing roller and the right smashing roller are arranged on the upper end of the interior of the box body; smashing teeth are arranged on the left smashing roller and the right smashing roller; a rotating shaft is arranged between the two drying chambers; a drying device is arranged in each drying chamber; a discharge channel is formed among the drying chambers and the intermediate plate; each drying device comprises heating pipes, a main pipe and blowers; the motor chamber is arranged at the lower end of the box body; a base is arranged at the lower end of the motor chamber; a drive motor and two shock absorbers are arranged in the motor chamber; the base is fixed to the bottom end of the box body in a welding manner; and a spring is arranged in each of the shock absorbers. The smashing and drying device disclosed by the invention is capable of performing thorough smashing to obtain uniform smashed particles, drying and absorbing shock.

The invention discloses a small lifting device used for electric power maintenance. The small lifting device comprises a bottom plate. The lower surface of the bottom plate is fixedly connected with four mounting blocks with the hollow interiors. The mounting blocks are uniformly distributed on the lower surface of the bottom plate. Threaded pins are inserted into the outer surfaces of the mounting blocks correspondingly and are in threaded connection with the threaded pins through threaded holes correspondingly. The ends, located in the mounting blocks, of the threaded pins are rotationally connected with first hinged seats through bearings correspondingly. According to the small lifting device, by arranging a driving motor, the driving motor drives a first threaded rod and a second threaded rod to rotate when adjusting of the working height causes variation of the center of gravity, two threaded sleeves are made to move close to or away from each other and drive supporting rods to open and close according to the working height, the two supporting rods, the first threaded rod and the second threaded rod form a triangle stable structure, a stable supporting effect is achieved, andtherefore, the purpose that the safety of the device is improved is achieved.

The invention relates to a double buffer device for washing machine in the washing machine that at least has one vibration absorber. It includes cylinder, piston, the first buffer section, and the second buffer section. The cylinder is hollow. The piston does advance and return movement in cylinder. The first buffer section is formed outside of the piston that causes friction while the piston doing advance and return movement to achieve a vibration absorbing function. The second buffer section is on the piston and could do relative motion between the region it located and the piston. It achieves the vibration absorbing function through rubbing the inner surface of the cylinder. The invention could make the vibration minimum that is delivered from the entire to casing.

The invention belongs to the transportation field, in particular to a potted flower transportation case comprising a first case body. A second case body is arranged in the first case body. The lower end of the second case body is fixedly connected with the inner bottom face of the first case body through a first elastic air bag. The peripheral side walls of the second case body are all fixedly connected with second elastic air bags. The side wall, far away from the corresponding side wall of the second case body 2, of each second elastic air bag is fixedly connected with the inner side wall ofthe first case body. The upper end of the first elastic air bag and the inner side wall of each second elastic air bag are both provided with air intake channels communicating with the second case body. First check valves are fixedly connected into the air intake channels. The side wall of the first elastic air bag and the side wall of each second elastic air bag are fixedly connected with firstexhaust pipes communicating with the outside. Second check valves are fixedly connected into the first exhaust pipes. The potted flower transportation case has a good damping effect, ventilation can be conducted on the transportation case in time, potted flowers are kept in the ventilating environment, and therefore diseases are reduced.

A fan frame of an axial-flow fan is provided to reduce the vibration generated during the rotation of the impeller that is transmitted to the outside of the axial-flow fan via the fan frame. The fan frame includes a housing, a base and a plurality of connection members. The base includes a shaft-coupling portion. Each of the plurality of connection members includes two ends respectively connected to the housing and the base. Each of the plurality of connection members is defined with an extension line passing through the two ends of the connection member. Each of the plurality of connection members includes a first bending portion and a second bending portion. The first bending portion extends around a first notch, and the second bending portion extends around a second notch. The extension line extends through the first and second notches.

This invention relates to a torque control device and a method for DC frequency conversion compressors including a current sampling part and a control part, in which, an 180deg. sine wave DC conversion mode is applied to test the position of a compressor rotor timely and control is carried out by the applied drive voltage to the motor of the drive compressor so as to adjust the output torque of the compressor timely and the compressor can keep torque balance at any time in the process of operation.

The present invention relates to a track structure for railroad or electric tramway. It incldues track self-body, on the non-working surface of said track self-body a damping body made of damping material is set, and this trackway with damping structure can absorb the vibration and noise produced by trackway when train is running on the trackway, specially, the first noise can be greatly absorbedby damping body, so that the production of the secondary noise can be naturally reduced. Said invention structure not only can reduced noise, but also can prolong the service life of track.

In a method and apparatus for magnetic resonance (MR) imaging of an object, and in particular MR imaging that yields images sensitive to molecular diffusion, undesired image artifacts induced by the rhythmic motion of the apparatus are reduced by manipulating the amplitude, phase, and timing of the diffusion encoding gradient pulses in a manner that interrupts, diminishes, or cancels the rhythmic motion. The residual vibration is evaluated manually or automatically to make such manipulations.

The invention relates to a dehumidifier which comprises a case, an evaporator, a condenser, a fan and a baffle plate, wherein a water collecting disk horizontally extends to the direction of an air outlet of the dehumidifier to form a supporting plate; a compressor which is arranged transversely is hung below the supporting plate through a plurality of connecting rods; the compressor is not in contact with the case, the supporting plate and the baffle plate; and a damping spring is arranged on each connecting rod, i.e. the damping spring is connected to each connecting rod to become part of each connecting rod. When the dehumidifier operates, the vibration generated by the compressor can not be directly transferred to a chassis and can be transferred to the case to generate vibration noise, and the damping spring arranged on each connecting rod and a damping rubber gasket arranged at the fixing part of each connecting rod and a compressor bracket can fully reduce the vibration of the compressor, thereby lowering the vibration and the noise when the dehumidifier operates.

Vibration dampening in a handle is accomplished by employing a relatively soft tube which is inserted into the interior hollow of the handle. A harder interior is provided to the tube and the interaction therebetween results in vibration dampening.

A power generation unit is connected with an engine rotary shaft via an accessory gearbox. A rotor extends through the accessory gearbox and a drive gear is disposed at an intermediate portion of the rotor for driving the latter. Permanent magnet elements are mounted on opposite side portions with the intermediate portion intervening therebetween, and stator coils are disposed so as to confront respective outer peripheries of the permanent magnet elements.