229results about How to "Small starting torque" patented technology

The invention belongs to the field of air conditioning systems, particularly relates to a double-cylinder variable-capacity compressor air conditioning system and a control method thereof. The air conditioning system comprises a large-cylinder circulation loop and a small-cylinder signal loop, wherein the large-cylinder circulation loop is formed by connecting a variable-capacity compressor, a first three-way pipe, a four-way selector valve, an outdoor heat exchanger, a throttle mechanism, an indoor heat exchanger and a second three-way pipe in sequence, and the small-cylinder signal loop is formed by connecting the variable-capacity compressor, the first three-way pipe and the three-way selector valve in sequence. In the control method of the double-cylinder variable-capacity compressor air conditioning system, the opening and the closing of the small-cylinder signal loop are controlled by the switch on/off condition of the three-way selector valve, thereby realizing reliable and active control for a small cylinder of an air conditioner, ensuring the operation of the air conditioner and bringing about good comfort to users; in addition, frost on the outdoor heat exchanger can be removed faster and more completely in the automatic defrosting process, and therefore, users feel more comfortable.

The invention is a starting and generating apparatus for an engine, including: a rotator configured to be used as a generator driven by an engine as well as used as a starter motor for starting the engine; a power transmission mechanism configured to connect the engine with the rotator; a starter drive unit configured to supply an electricity to the rotator to drive the rotator as the starter motor when the engine is to be started; a clutch mechanism configured to shut off a power transmission from the engine to the power transmission mechanism when the engine is to be started; and a clutch control unit configured to bring the clutch mechanism into a connected state when a rotational speed of the rotator has reached a given rotational speed at which the engine can be started.

A hydrodynamic fluid film bearing assembly has a stationary retaining member defining a central opening and having an inner surface lined by a foil assembly comprised of a plurality of foil subassemblies. Each foil subassembly comprises a first compliant foil, a second compliant foil, and a spring foil, and subtending a rotational segment, less than all, of the inner surface of the retaining member. The complaint foils and the spring foil of each foil subassembly are held within the retaining member in such a way that sliding travel of one compliant foil along the inner surface of the opening is in the opposite rotational direction of sliding travel of the other compliant foil and the spring foil. The foil subassemblies may be restrained from undesired movement during operation by a retention tab extending from the foil subassembly which engages a channel and recess feature formed in the retaining member.

The invention discloses a control method of an electronic expansion valve of an air conditioner. The maximum opening of the electronic expansion valve is 480 pulses. The control method comprises the steps that after a starting instruction is received, a control system of the air conditioner opens the electronic expansion valve to the maximum opening or to more than 70% of the maximum opening, and then a compressor is started; after the compressor is started and operates for a period of time till operating stably, the opening of the electronic expansion valve is adjusted to the target operating opening; an air conditioner system operates normally; when a shutting-down instruction is received, the control system of the air conditioner opens the electronic expansion valve completely. According to the technical scheme, due to the fact that the electronic expansion valve is completely opened in the starting process, the coolant pressure difference between the two ends of a system throttling device can be reduced, the starting resistance of the compressor can be reduced, and the starting current can be reduced. The service life of system elements can be prolonged. A small-capacitance capacitor can be used, and therefore the system cost can be lowered, and impact on a power grid and other household appliances can be reduced.

A discrete frequency conversion start-up system of the alternating current impression electromotor and its start-up method. It includes mutual inductor, amplifier, crystal brake, processor, liquid crystal screen, chip machine and keyboard. The steps are as follows: program initialization, detect the initial follow current angle, set the trigger angle of the discrete frequency conversion frequency and make the minimal trigger angle larger than initial follow current angle; frequency division trigger subprogram, frequency division trigger subprogram, frequency division trigger subprogram, frequency division trigger subprogram, frequency division trigger subprogram and flexible start-up subprogram. The invention can make the three-phase alternating current induction motor start up normally when it is heavily loaded and fully loaded.

The invention relates to a current-limiting soft-starting method of an asynchronous motor under wideband power supply; by adopting multi-level frequency-division current-limiting soft starting, according to Ua, Ub and Uc synchronizing signals, the power generating frequency of a power generator and effective value of current, the conducting moment and conducting time of all silicon controlled rectifiers are determined, and when the rotating speed difference of the synchronous rotating speed and practical rotating speed of the motor is no more than the setting value of the rotating speed difference, a bypass contactor of a main loop is closed, and direct driving is carried out. The method has the advantages of simple structure, small volume, light weight, convenient maintenance, good performance, high reliability and good economical efficiency.

The invention discloses a fabric type surface texture friction pre-filling type self-lubricating knuckle bearing. The fabric type surface texture friction pre-filling type self-lubricating knuckle bearing comprises an inner ring and an outer ring; a surface texture is machined on the outer sphere face of the bearing inner ring (3) and subjected to self-lubricating material friction pre-filling technology treatment to form a self-lubricating material friction pre-filling surface texture structure; and a layer of fabric self-lubricating material liner is pasted on the surface of the inner sphere face of the bearing outer ring (1). Abrasion to the fabric liner by the edge of the surface texture in the initial stage of friction is avoided to a certain degree, the surface texture is easily full of self-lubricating materials in a friction mode, and the process is simple. The self-lubricating materials pre-filling the textured surface optimize the friction interface material configuration, so that a friction surface transfer membrane is easy to generate, the texture edge cutting effect is weakened to a certain degree, the friction interface has lower static friction coefficient and lower dynamic friction coefficient, and accordingly the service life of the self-lubricating knuckle bearing is greatly prolonged.

The invention discloses a quick batch-sampling and separating device, which comprises a sampling valve, test tubes, a test-tube stand, a sampling turntable, a turntable bracket, a positioning sensor, a driving mechanism, a vacuum pump, a vacuum suction head, a control device, a platform bracket and the like, wherein the sampling turntable is arranged on the turntable bracket, and is driven by the driving mechanism to rotate around the turntable bracket; the test-tube stand is arranged on the sampling turntable and rotates together with the sampling turntable; under the driving of the driving mechanism, the test-tube stand drives the test tubes to quickly move, so that samples are quickly separately arranged in the test tubes, and the requirement of quick batch-sampling is met. Meanwhile, the test tubes arranged in the test-tube stand consist of upper and lower layers of sampling test tubes and separating test tubes; and separating diaphragms are arranged in the sampling test tubes and extract and separate sampled substances entering the sampling test tubes under the vacuum condition. The device is particularly suitable for instable metabolic flow analysis requiring quick sampling, and quick batch-sampling analysis in the non-steady-state reaction process.

The invention discloses a variable stiffness double-mass secondary pendulum chaotic vibromill and relates to a vibromill, and in particular relates to a variable stiffness double-mass two-stage pendulum chaotic vibromill. The chaotic vibromill comprises an upper mass, a lower mass, a main vibration spring, a vibration isolation spring, a base, and the like, wherein the upper mass mainly comprises a vibration motor, a cylinder body, a right connecting frame, a left connecting frame and a counter weight; the cylinder body mainly comprises a feed inlet, an end cover, a discharge hole and a mill medium; the upper mass and the lower mass are connected through the main vibration spring, and the inner diameter of the main vibration spring is matched with the outer diameters of spring guide posts on the upper mass and the lower mass; the lower mass is supported on the base through the vibration isolation spring; the vibration motor comprises pendulum assemblies, and the pendulum assemblies are symmetrically distributed at the left end and the right end of a vibration motor shaft; and each pendulum assembly comprises a fixed pendulum, a flat key, a shaft sleeve, a primary movable pendulum, a bearing 1, a vibration motor shaft, a secondary movable pendulum shaft, a bearing 2 and a secondary movable pendulum.

A disk type generator capable of changing power is disclosed. The disk type generator comprises a generator shaft; one end of the generator shaft is connected with a power input apparatus; the disk type generator also comprises disk type motors, a control signal collection and feedback unit and a control unit; the number of the disk type motors is at least two; each disk type motor comprises a stator and a rotor; the stators and the rotors are alternatively arranged on the generator shaft in a sleeving manner; the disk type motors are arranged on the generator shaft in a sleeving manner; the stators of the disk type motors are provided with electric power output ends; the electric power output ends are connected with output cables and externally connected with a power grid through the output cables; a control switch is arranged between the disk type motors and the output cables; the input end of the control signal collection and feedback unit is connected with the output ends of the disk type motors; the output end of the control signal collection and feedback unit is connected with the input end of the control unit; and the output end of the control unit is connected with the control switch. The disk type generator is simple in structure, and capable of stably outputting voltage and automatically changing the output power according to changes of external conditions at the right moment.

The invention discloses a permanent-magnet spherical motor rotor self-adapting control system based on dynamic friction compensation. The system is characterized in that a permanent-magnet spherical motor rotor servers as a controlled object, and the control system is set to comprise a parameter self-adaptation adjustment module, a dynamic friction state observation module, a dynamic friction feedforward compensation module and a calculation moment module. The parameter self-adaptation adjustment module obtains adjustment parameters of the calculation moment module and the dynamic friction feedborward compensation module by real-time calculation achieved in a self-adaptation algorithm. The dynamic friction state observation module is composed of two state observers with two different dynamic items and is used for calculating state quantity estimation value in a dynamic friction model in real time. The dynamic friction feedforward compensation module calculates in real time to obtain a friction compensation moment tfc. The calculation moment module calculates to obtain a main control moment tc. The total control moment t of the controlled object is set to be t=tfc+tc. According to the control system, dynamic friction compensation of the permanent-magnet spherical motor rotor is achieved, and accordingly control precision is improved, and starting moment is reduced.

The invention relates to a safe and reliable window glass breaking device for escaping from traffic vehicles and relates to a rapid vehicle window glass breaking device in emergency. The safe and reliable window glass breaking device is used for traffic vehicles such as a bus, a school bus, a travel bus and a subway, and takes the place of an emergency hammer which is widely used in an existing passenger bus; and the window glass of the vehicle is crushed by the impact force generated by high pressure air or the impact force generated by a compressed spring. The safe and reliable window glass breaking device has electrical and manual functions; for the electrical function, a small low speed motor is adopted to drive a cam to rotate around and the cam oppresses a lever so as to release self locking of a cone hammer, and then the window glass is crushed by the cone hammer; for the manual function, the cam is pressed down by a finger, the lever amplifies the force so as to release the self locking of the corn hammer, and then the window glass is crushed by the cone hammer. As the structure of the safe and reliable window glass breaking device is large in crushing impact force, accurate in crushing acting point, good in crushing effect and safe and reliable in use, a remarkable creation of the window glass breaking device for escaping from traffic vehicles is realized. The safe and reliable window glass breaking device belongs to the technical field of vehicle safety devices.

Following structures are adopted in the electromotor of rare earth permanent magnet: slotted solid pole, extension duplex start-up cage, pole core with large polar arc, large even air gap or heteropic air gap, small rectangle block of permanent magnet embedded to slot. Comparing with conventional permanent magnet motor of laminated pole, the basic series of permanent magnet synchronous motor possesses advantages: obviously raised starting torque 2.2-3.7, and asynchronous motor as 1.8-2.0; raised capability rank, for example it is possible to use 22kW permanent magnet motor to replace asynchronous motor in 30kWY series so as to obtain energy saving effect; start up current 5-7 times of the disclosed motor is smaller than start up current of asynchronous motor; moreover, shorter start up current, and no severe oscillation phenomenon. The basic series also overcomes difficult problem of demagnetization of neodymium - iron - boron permanent magnet electromotor.

The invention discloses a magnetic liquid sealing device. The magnetic liquid sealing device comprises a shell, a rotating shaft, a shaft sleeve, a first pole shoe, a second pole shoe, a permanent magnet and an end cover, wherein a cavity is formed in the shell; the rotating shaft is rotatably arranged in the cavity; the shaft sleeve is arranged on the rotating shaft in a sleeving mode; a plurality of protrusions are arranged on the periphery of the shaft sleeve and arranged in the axial direction of the rotating shaft at intervals; the first pole shoe and the second pole shoe are arranged inthe axial direction of the rotating shaft at intervals; a plurality of first pole teeth are arranged on the inner circumferences of the first pole shoe and arranged in the axial direction of the rotating shaft at intervals; the plurality of first pole teeth and the plurality of protrusions are oppositely arranged in the radial direction of the rotating shaft; a plurality of second pole teeth are arranged on the inner circumference of the second pole shoe and arranged in the axial direction of the rotating shaft at intervals; the plurality of second pole teeth and the plurality of protrusions are oppositely arranged in the radial direction of the rotating shaft; one end of the shaft sleeve is connected to the end cover; and the permanent magnet surrounds the rotating shaft and is arranged between the first pole shoe and the second pole shoe. The magnetic liquid sealing device can reduce a sealing gap, the injection amount of magnetic liquid, and the magnetic liquid seal starting torque.

The invention discloses a vibration exciter and a vibrating screen with the vibration exciter. The vibration exciter comprises a vibrating shaft (13), a fixed eccentric block (10) fixed to the vibrating shaft (13) and a movable eccentric block (1) rotatably arranged on the vibrating shaft (13). The vibration exciter comprises a screw transmission pair, a first piston (17) and a driving unit used for driving the first piston (17), the screw transmission pair is fixedly connected with the movable eccentric block (1), the driving unit is arranged to drive the first piston (17) in the starting process of the vibrating shaft (13), and therefore the movable eccentric block (1) is driven by the screw transmission pair to rotate relative to the vibrating shaft (13). The vibration exciter can achieve low-torque starting, is small in impact on a power grid and small in required power transformer capacity, a high-power driving motor is not needed, the motor power factor can be at a best position, and efficiency is improved.

The invention belongs to the field of wind energy utilization, and discloses an approaching airstream energy recovery device of an electric automobile. The device comprises a generator, a wind energy concentration device and a wind turbine, wherein the wind energy concentration device is a pipeline of which an inlet and an outlet in the two ends are wide and the middle is narrow, and is arranged in a front cabin of the automobile; the inlet is positioned in the rear side of an air inlet grille of the automobile; the outlet is formed in the bottom of the front cabin of the automobile; the wind turbine is arranged in the wind energy concentration device; the generator and the wind turbine are connected through a permanent magnetic bearing; the tail ends of the wind turbine and the generator are connected with rolling bearings respectively; the wind turbine is formed by combining lift genre blades and resistance genre blades, so the starting performance and the actual operation performance of the wind turbine are improved; during the running of the electric automobile, an airstream which enters the front cabin of the automobile from the air inlet grille is firstly introduced into the wind energy concentration device, and flow field optimization is performed through rectification and speed-up effects of the concentration device; the optimized airstream flows to the blades of the wind turbine to drive the wind turbine to rotate, and the generator starts to work under driving of the wind turbine, so that the conversion of wind energy to electric energy is realized.

The invention relates to a non-load starting device and method for a variable hydraulic pump and belongs to the fields of fluid transmission and control. The non-load starting device for the variable hydraulic pump comprises the variable hydraulic pump and a little-channel direction control valve, wherein the variable hydraulic pump is provided with a control port X, and the direction control valve is used for performing unloading on an X port oil path of a variable control device of the variable hydraulic pump. During starting, unloading of the X port oil path of the variable control device is achieved through the direction control valve, so the displacement of the variable hydraulic pump can return to zero quickly. In the process of converting a stating state into a normal working state, the X port oil path of the variable control device can be in a non-load state through the control action of the direction control valve, and therefore the variable hydraulic pump can enter the normal working state. The invention further discloses a non-load starting method for the variable hydraulic pump. The non-load starting device is simple and reliable in structure, small in system impact pressure, free of flow overflowing power loss and suitable for non-load starting of variable hydraulic pumps with large displacement or small displacement.

The invention discloses a refrigeration compressor with oil storage grooves. The oil supply system is arranged on a crank shaft; grooves for storing lubricating oil are formed in a spiral oil groove in a main shaft part of the crank shaft and a spiral oil groove in the eccentric part of the crank shaft; then oil storage grooves are formed in the spiral oil grooves of the crank shaft. Through the adoption of the structure that the oil storage grooves are formed in spiral oil grooves in the main shaft part and in the eccentric part of the crank shaft, the lubricating oil in the spiral oil grooves can be collected when the compressor stops working, then when the compressor starts to work again, moving parts are lubricated quickly, the starting torque of the compressor can be reduced, the friction abrasion at the starting moment is reduced, and the operating life of the compressor is effectively prolonged. The compressor can be used for various occasions needing a piston type refrigeration compressor.

The invention relates to a start control system and method of a wind generating unit. The real-time wind speed of the environment in which the wind generating unit works and the real-time rotating speed of a generator shaft are monitored in real time, so that a target pitch angle of blades is determined, a pitch angle of the blades is adjusted to the target pitch angle, the start torque of the blades can be increased, a wind wheel is driven to accelerate to reach paralleling rotating speed, and electric generation is started. Due to the fact that the target pitch angle is determined in real time according to the real-time external environment and the state of the wind generating unit and continuously adjusted, the wind generating unit can adapt to environment changes and self-state changes and can react rapidly in time. Particularly, when the wind speed of the environment in which the wind generating unit works is low and the rotating speed of the blades cannot reach rotating speed needed by paralleling electric generation, the pitch angle of the blades is adjusted to the target pitch angle, the start torque of the blades is increased, the start wind speed of the wind generating unit is lowered, then, the electric generating efficiency of the wind generating unit at the low wind speed is improved, and the manufacturing cost and energy consumption of the unit are not increased.

The invention provides a main shaft supporting structure of a centerless grinder for grinding a valve lock groove. By the main shaft supporting structure, a main shaft is not required to contact a bearing when rotating, and is low in starting torque and power consumption and high in rotation accuracy. The main shaft supporting structure comprises the main shaft, a main shaft shell and a grinding wheel chuck, wherein the grinding wheel chuck is sleeved at the end part of the main shaft; and the main shaft penetrates through the main shaft shell. The main shaft supporting structure is characterized in that: a hydrodynamic pressure and hydrostatic pressure oil film bearing is arranged at each of the two ends of the main shaft shell; the main shaft penetrates through inner holes of the hydrodynamic pressure and hydrostatic pressure oil film bearings; an oil line is reserved in the main shaft shell, and is communicated with inner oil cavities of the hydrodynamic pressure and hydrostatic pressure oil film bearings; and the inner oil cavities are uniformly distributed on inner sidewalls of the inner holes of the hydrodynamic pressure and hydrostatic pressure oil film bearings, and wrap the peripheral surface of the main shaft.

The invention provides a wind-collection supercharged type magnetic-suspension vertical wind power generation system. The wind-collection supercharged type magnetic-suspension vertical wind power generation system comprises a main body frame, a generator, a control system, a pushing magnetic-suspension bearing, a multiple-section combined shaft mounted on the pushing magnetic-suspension bearing, a combined blade mounted on the combined shaft and an automatic-steering wind collection protection system. The automatic-steering wind collection protection system comprises a wind collection rotating frame mounted on the main body frame, a left wind collection plate, a right wind collection plate, a wind-accumulation supercharging plate, a wind collection rudder plate and a wind collection system steering driving device, wherein the left wind collection plate and the right wind collection plate are mounted windward. The wind collection rudder plate and the wind collection system steering driving device push the wind collection rotating frame to rotate along with the wind direction, and drive the left wind collection plate and the right wind collection plate to always face the front wind direction, and accordingly, the maximum wind collection quantity and the maximum continuous wind power driving torque are acquired. The wind collection system always rotates windward, dead angle is avoided, the wind collection quantity is maximized, and power generation capacity and wind resource utilization efficiency of the wind power generator are increased.

The invention relates to an exciting component with an adjustable exciting force. When a piston rod of an exciting force adjusting hydraulic cylinder extends out or contracts back to a preset position, a middle moveable gear is meshed and rotated with a lower moveable synchronizing gear, a moveable eccentric block is rotated for a preset angle relative to a coaxial eccentric block and a lower moveable eccentric block is rotated for the preset angle relative to a coaxial lower eccentric block. A stabilizing device comprises a front stabilizing device and a rear stabilizing device which are connected with each other through a universal driving shaft, wherein the exciting component with the adjustable exciting force is arranged in each of the front stabilizing device and the rear stabilizing device. The exciting component is adopted, so that the stabilizing device can realize the adjustable exciting force, the adjustment is convenient and flexible, the structural force is reasonable and the reliability is high.

The invention discloses a harmonic reducer and a mechanical arm, belongs to the technical field of harmonic reducers. The harmonic reducer and the mechanical arm solve the problems that the starting torque of an existing harmonic device is large, the starting current of a motor is large, the carrying capacity of a mechanical arm is not large, and the operation is not stable. The harmonic reducer is characterized by comprising an inner shaft and an outer shell positioned on the outer side of the inner shaft, the outer shell comprises a first end cover which is annular and is arranged on the inner shaft in a sleeving mode, a rigid gear and a flexible gear are arranged on the inner side of the first end cover, a first part and a second part are arranged on the first end cover, a first bearing is arranged between the first part and the inner shaft, and the second part and the inner shaft are in clearance gap seal. According to the harmonic reducer and the mechanical arm, the second part on the first end cover and the inner shaft are of a clearance gap seal structure, and a fourth part on a second end cover and the inner shaft are of a clearance gap seal structure so that the starting torque of the harmonic device can be small, the starting current of the motor can be small, and meanwhile, the carrying capacity and the stable operation of the mechanical arm can be improved.