120results about How to "Avoid overheating and burning" patented technology

Phacoemulsification apparatus includes a phacoemulsification handpiece having a needle and an electrical circuitry for ultrasonic vibrating the needle. A power source provides pulsed electrical power to the handpiece electrical circuitry and an input is provided for enabling a surgeon to select an amplitude of dislighted pulses and a pulse width. A control system and pulse duty cycle is provided for controlling the off duty cycle to insure heat dissipation before a subsequent pulse is activated, including a foot pedal switch.

Phacoemulsification apparatus includes a phacoemulsification handpiece having a needle and an electrical circuitry for ultrasonic vibrating the needle. A power source provides pulsed electrical power to the handpiece electrical circuitry and an input is provided for enabling a surgeon to select an amplitude of dislighted pulses and a pulse width. A control system and pulse duty cycle is provided for controlling the off duty cycle to insure heat dissipation before a subsequent pulse is activated, including a foot pedal switch.

The invention discloses an over-temperature protection method and device. Over-temperature protection is carried out on an IGBT without taking the real-time temperature of a temperature sensor as the reference but the real-time temperature change rate of the temperature sensor, particularly, when the real-time temperature change rate of the temperature sensor reaches a preset value, unusual conditions are known, a motor system is controlled to stop in time, and the purpose of over-temperature protection is realized. According to the research, when the temperature of an IGBT wafer rapidly rises due to the abnormal condition of a cooling system and the like, even though the real-time temperature of the temperature sensor is far smaller than the temperature of the IGBT wafer at the same time, the temperature of the sensor will synchronously and rapidly rise along with the changes of the temperature of the wafer and is largely larger than the normal temperature change rate of the sensor of the cooling system. Compared with the prior art, the real-time temperature change rate of the temperature sensor is used as the reference parameter and can more accurately reflect the happening abnormal conditions, and the phenomenon of over-temperature burning of the IGBT module is effectively avoided.

Multiplex hygienic-therapeutic devices are based upon plurality energy members arranged in at least one layered structure. The devices comprise energy members including, for example, electromagnetic, sonic, microwave, magnetic, thermal, electric, electrostatic, mechanical, ionic, and ionizing radiation. The use of multiplex hygienic-therapeutic devices with the hygienic and therapeutical substances whose hygienic-therapeutical properties may be enhanced by radiation of the energy member and / or the energy members of the multiplex hygienic-therapeutic devices is also disclosed.

The invention relates to an LED (light-emitting diode) high-thermal-conductivity composite material and a preparation method thereof. The LED high-thermal-conductivity composite material is prepared by mixing 60-90 wt.% of nylon resin as a base material, 5-30 wt.% of flaky inorganic filler and powdery inorganic filler subjected to surface treatment by a coupling agent, 2-10 wt.% of flame retardant and 0.5-2 wt.% of compatilizer. Compared with the prior art, the method enhances the thermal conductivity of the material; the method can prevent the hazard of product combustion and ignition caused by overhigh heat, thereby greatly enhancing the safety performance; the molecule-atom combination reaction rate is greatly enhanced, so that the base material and filler can be combined together more quickly and compactly, thereby enhancing the thermal conductivity of the material; the composite material has the advantages of simple preparation technique and low cost, and can save abundant resources; and the method is suitable for mass production.

The invention relates to a gravity type flat heat pipe radiator for cooling an LED in the technical field of LEDs. The gravity type flat heat pipe radiator comprises a central radiating pipe, a combined radiating pipe, radiating fins, a cover plate and a straight rib, wherein the central radiating pipe is fixedly connected with the combined radiating pipe; the combined radiating pipe is fixedly connected with a substrate of the LED; the cover plate is fixedly arranged on the top of the combined radiating pipe; a plurality of radiating fins are fixedly arranged on upper and lower sides of the cover plate and are respectively connected with the externals of the central radiating pipe and the combined radiating pipe; and the straight rib is radially arranged in the combined radiating pipe and is connected with the radiating fins. The gravity type flat heat pipe radiator is a novel high-power LED radiator with the advantages of large radiating area, high radiating efficiency, good starting performance, light weight, good temperature uniformity, compact structure and convenient processing.

The invention relates to an IGBT (insulated gate bipolar translator) temperature detecting method. The method comprises the following steps: firstly, acquiring a voltage signal on an NTC (negative temperature coefficient) thermistor; secondly, converting the voltage signal into a frequency signal by a V-F (voltage-frequency) converting unit; thirdly, converting the frequency signal into an optical signal by a transmitting unit and subsequently transmitting the optical signal to a receiving unit; fourthly, restoring the optical signal into a frequency signal by the receiving unit and subsequently transmitting the frequency signal to a control unit; and fifthly, firstly detecting the frequency of the frequency signal and calculating the IGBT temperature by the control unit so as to accomplish the detection. According to the method, as an optical fiber is adopted to transmit signals, the electromagnetic interference resistance is strong, so that the method is applicable for being used in situations which highly require the anti-electromagnetic interference resistance; by acquiring the voltage of the NTC thermistor, the IGBT temperature can be detected; the real time monitoring function is achieved; the IGBT is prevented from being burned because of overheat; the procedures of the whole method are simplified; the cost of adopted hardware is low; and the application cost is reduced greatly.

The invention discloses an overvoltage and electric leakage integrated protection circuit breaker, comprising a shutdown switch, a first overvoltage protection component, a second overvoltage protection component, a zero-sequence current transformer, an electromagnetic relay, a tripping linkage mechanism and an electric leakage protection triggering circuit; the first overvoltage protection component comprises a voltage dependent resistor chip and a PTC thermistor chip located in an encapsulating layer and has three leading-out terminals; the second overvoltage protection component comprises a voltage dependent resistor chip and a PTC thermistor chip located in an encapsulating layer and has two leading-out terminals; when the shutdown switch is a single-phase power switch, only one first overvoltage protection component is installed; when the shutdown switch is a three-phase power switch, one overvoltage protection component and two overvoltage protection components are installed; when the electric leakage or the overvoltage in any phase of the three-phase power supply occurs, the shutdown switch can trip off immediately. The circuit breaker has an overvoltage and electric leakage integrated protection function; and the safety and the reliability of the circuit breaker are much better than that of the present electric leakage circuit breaker.

The invention relates to a brushless direct current motor for car power-driven / gasoline mode rapid switching. The brushless direct current motor comprises a shell (1), a rotor (2), a stator (3), a main shaft (4) and an end cover (6); the rotor (2) is fixedly installed on the section, located in the shell (1), of the main shaft (4), the stator (3) is fixedly installed in the shell (1) and is opposite to the rotor (2), the output end of the main shaft (4) is supported to the interior of a bearing (7) which is installed in the end cover (6), and the end cover (6) is fixed to the opening end of the shell (1). The brushless direct current motor is characterized in that the inner lateral face and the outer lateral face of the bearing (7) are axially positioned through a check ring (51) for holes and a check ring (52) for shafts; a temperature sensor (33) is installed on a stator coil (32) of the stator (3) and is electrically connected with a car fan starting power source, when the temperature sensor (33) detects that the temperature inside the brushless direct current motor exceeds a set value, a car fan (10) is started to cool the brushless direct current motor, and therefore the brushless direct current motor works at the temperature lower than the set temperature valve. The brushless direct current motor has the advantages of being small in size and reliable in connection.

The invention discloses an energy-saving switch cabinet with a good radiating effect. The energy-saving switch cabinet with the good radiating effect comprises a cabinet body; a partition plate is horizontally arranged in the middle position in the cabinet body; the cabinet body is divided into an upper cavity and a lower cavity through the partition plate; an upper water conveying pipe which is transversely arranged is arranged on the inside wall of the upper cavity; a lower water conveying pipe which is transversely arranged is arranged on the inside wall of the lower cavity; the water inlets of the upper water conveying pipe and the lower water conveying pipe are both connected with a water inlet pipe; the water inlet pipe is connected with a main water inlet pipe; the right end of the main water inlet pipe is connected with a water outlet of a water storage box which is arranged on the right side of the cabinet body. According to the energy-saving switch cabinet with the good radiating effect disclosed by the invention, circulating water in the cabinet body can be cooled; the cooling effect is good; the efficiency is high; a rainproof roof which is arranged on the upper side of the cabinet body can prevent rain effectively; rainwater can be collected and used for cooling the circulating water; the water resources are saved; the energy consumption is reduced; the good radiating effect is further ensured by a plurality of exhaust pipes and rainproof plates; in addition, the anti-theft performance and the safety performance of the switch cabinet are effectively improved through an arranged fingerprint lock.

The invention relates to a microwave spraying vacuum drier for drying sticky materials, in particular for chemicals, Chinese traditional medicines and food, and the like, with strong thermal sensitivity as desiccant. The invention comprises a drying container, a feed inlet, a microwave feed-in device and a material atomization device arranged on the top part of the drying container, a container for drying finished products arranged on the lower part of the drying container, a metal screen arranged between the drying container and the container for drying finished products, a vacuum pump joint arranged on the lateral wall of the drying container, a material preheating components connected between the feed inlet and the material atomization device below the microwave feed-in port of the microwave feed-in device and a vibrating mechanism for delivering materials and preventing materials from being sticky to the wall surface. The vacuum drier of the invention has the advantages of simple production, wide application range, as well as comparatively high drying uniformity and efficiency.

The invention provides a spinning workshop dust collector. The spinning workshop dust collector comprises a dust suction device, a dust collection device and a power device. Fiber impurities in a spinning workshop can be prevented from entering a dust suction pipe to cause blockage by means of a sweeping connector and a cutting-off mechanism of the dust suction device. An anemograph in the dust collection device can detect the magnitude of wind power of the dust collector in real time and then judge whether overload operation is carried out or not. The fiber materials sucked into the dust suction pipe are filtered through a detachable coarse filtering part, and the fiber materials are prevented from entering an air inlet of the dust collection device. An overload protection circuit in the power device controls the operating state of a motor of the dust collector and avoids overload. According to the spinning workshop dust collector, the large fiber impurities sucked into the dust collector can be reduced, and the blockage probability is reduced; the coarse filtering part, an overload protection cavity and the overload protection circuit are arranged, the dust collector can be prevented from being in an overload work state for a long time, overheat burndown of the motor is avoided, and the problem that a motor of a traditional dust collector is easily damaged due to blockage is solved.

The invention relates to a belt transmission type starting and power generation integrated machine. The belt transmission type starting and power generation integrated machine comprises a belt pulley, a driving end cover assembly, a stator assembly, a rotor assembly and a carbon brush end cover assembly and is characterized in that a bearing chamber is arranged at a position, corresponding to a rotor shaft, at the middle of a carbon brush end cover, a bearing sensor is arranged in the bearing chamber, the end part of a carbon brush in a carbon brush rack props against the circumferential surface of a current collection ring of a rotor shaft, a junction box is further arranged outside the carbon brush end cover, a wiring seat is fixedly arranged in the junction box and is used for connecting three phase cables, cable heads of the three phase cables are separately and fixedly provided with connection sheets, the connection sheets separately pass through a socket of the junction box and enter to the junction box to be fixedly connected with the wiring seat, a sealing cover is fixedly arranged at the top of the junction box, a temperature sensor is arranged at the end part of a stator iron core, and a signal wire connector of the temperature sensor is fixed on the carbon brush rack. The belt transmission type starting and power generation integrated machine is compact in structure and has the advantages of a rapid starting function, low starting noise, automatic switching between starting and power generation and high power generation efficiency, and also has functions of assisted electric power for an engine and vehicle braking energy recycle.

The invention discloses a device and a method for single board insertion and extraction. The device for single board insertion and extraction comprises a tray, a drive part and a control part. Guide rails are arranged on the opposite two sides of the tray which is used for fixing a single board. The drive part is connected with the tray and is used for driving the tray to slide along the guide rails according to a driving signal. The control part is connected with the drive element and used for outputting the driving signal to the drive part. In the invention, the single board can be inserted and extracted automatically through the control signal, which resolves the problem that pins of the single board are easy to be damaged by manual single board insertion and extraction and avoids possibilities to damage the pins of the single board caused by manual operation.

The invention discloses a maglev train suspension control method, system and device and a readable storage medium. The maglev train suspension control method comprises the following steps that a real-time suspension gap, a real-time speed and a real-time acceleration of a maglev train are obtained; according to a positive related functional relation between the real-time speed and a rated suspension gap, a present rated suspension gap corresponding to the present real-time speed is determined; and a suspension control current is determined corresponding to the present rated suspension gap, the present real-time acceleration and the present real-time suspension gap of the maglev train, and the suspension control current is applied to a suspension electromagnet. According to the method, the corresponding rated suspension gap is determined according to the real-time speed, and then the suspension control current to be applied to the suspension electromagnet is determined, so that a real suspension gap generated by the action of the suspension electromagnet at the real-time speed and the heat dissipation effect of the electromagnet achieve a good balance, and the contradiction between a suspension gap requirement and a suspension electromagnet heat dissipation requirement in the prior art is solved.

The invention relates to a special hot blast furnace for a drying shed. The top of a combustion chamber is an arch-shaped furnace top made of steel plates in a rolling mode; a left side plate, a right side plate, a front plate, a rear plate and a fire net are connected with the edge of the arch-shaped furnace top to form the combustion chamber; an ash box is arranged between the fire net and a base plate; firebrick furnace linings are built on the inner side which abuts against the left side plate, the right side plate, the front plate and the rear plate; a secondary air duct is arranged between the ash box and the combustion chamber; the upper portion of the rear plate of the combustion chamber is a fire outlet tube sheet connected with a finned tube exchanger; the finned tube exchanger is composed of at least three sets of small-bore finned tubes, wherein a plurality of small-bore finned tubes serve as each set, the finned tubes are arranged to be an upper layer, a middle layer and a lower layer through connecting boxes and are connected and communicated in sequence to form a high-temperature smoke gas flow path and two ports, the upper port is connected with the fire outlet tube sheet, and the lower port is connected with a smoke collecting box; a chimney is led out below the middle portion of the smoke collecting box. The special hot blast furnace is mainly used for baking bamboo and wood products and agricultural and sideline products in cooperation with the drying shed.

The invention relates to a machine tool safety control system comprising a temperature detection module, a control module, an alarm module and a cooling module. The temperature detection module is arranged inside an electric spindle, and is used for detecting an oil mist concentration of the electric spindle and sending oil mist concentration signals to the control module. The control module sends alarm signals to the alarm module when the concentration of oil mist is relatively low, and sends cooling signals to the cooling module when the concentration of the oil mist is relatively high. The alarm module is used for receiving the alarm signals, and displaying alarm information to machine tool operation personnel. The cooling module is used for receiving the cooling signals and sprinkling fire extinguishing agents to reduce the concentration of the oil mist inside the electrical spindle. The machine tool safety control system of the invention is simple in structure, easy to manufacture, wide in usage scope and suitable for lubricating oil mist concentration detection of various machine tools. At the same time, the machine tool safety control system can accurately control the oil mist concentration of lubricating oil passageways. Safe working of a machine tool can be guaranteed, and at the same time, wastes are reduced and the lubricating oil is saved.

A thermal protection circuit comprises a control chip, an operational amplifier, a thermistor, a plurality of triodes and a plurality of capacitive resistors. Resistance of the thermistor changes along with changes of temperature, when the temperature does not exceed first preset temperature, the control chip operates normally; when the temperature exceeds the first preset temperature and does not exceed second preset temperature, working frequency of the control chip drops and the temperature drops; and when the temperature exceeds the second preset temperature, the control chip is power-off and stops working. Due to the thermal protection circuit, a circuit element can be effectively prevented from being overheated and burnt down.

The invention discloses a dual power automatic transfer switch conversion control method. If a dual switch is in a commonly used position, when an abnormal frequently-used power supply is detected andthe duration is T1 while a standby power supply is normal, no matter whether the frequently-used power supply returns to normal or not, the dual switch is switched from the commonly used position toa switched off position; if the switch is in the standby position, for example, when the frequently-used power supply returns to normal and is kept normal for time T3, the switch is switched from thestandby position to the switched off position; after the switch is switched to the switched off position, the time T2 is waited; if the standby power supply is normal during the period, the switch isswitched from the switched off position to the standby position after the time T2; if the standby power supply is abnormal and the frequently-used power supply is normal during the period, the switchis switched from the switched off position to the commonly used position after the time T2; and if during the period, the standby power supply is abnormal and the frequently-used power supply does notreturn to normal, the switch remains at the switched off position. The invention also discloses a dual power automatic transfer switch. According to the dual power automatic transfer switch conversion control method and the dual power automatic transfer switch, the frequent switching of the switch position can be prevented when the voltage of the frequently-used power supply is unstable.

The invention provides an equalization circuit, a design method thereof and a battery management system, and the equalization circuit comprises a control sub-circuit which comprises a control end, a first end and a second end, wherein the control end is used for accessing a control signal, and the control signal is used for controlling the conduction state between the first end and the second end;a first series branch which comprises a first equalizing resistor and a first thermistor which are connected in series, wherein the first series branch is connected between the first end and the signal input end of a first battery monomer in the battery module in series; and a second series branch which comprises a second equalizing resistor and a second thermistor which are connected in series,wherein the second series branch is connected between the second end and the signal input end of a second battery monomer in the battery module in series. Thus, if the current of the series branch isincreased to cause the temperature rise of the equalizing resistor, the resistance value of the thermistor is quickly increased along with the temperature rise so that the current in the series branch is reduced, the temperature of the equalizing resistor is also reduced, and the thermal protection of the battery module is realized.

The invention relates to the technical field of electromechanical equipment, and discloses a shaft connector with overload protection. The shaft connector comprises a shell, an output shaft and an input shaft, wherein the output shaft is fixedly connected with a driven sleeve, the input shaft is fixedly connected with a driving column, and the driving column is assembled in a concave-convex curvedsurface. According to the invention, by using the principle that the output power of the motor is determined by the load, the maximum output torque of the shaft connector is limited, so that the output torque and power of the motor are limited, overload operation of the motor is avoided, and the overload capacity of the motor is improved; when the motor is overloaded due to self factors, the motor is overloaded, so that the rotating speed is reduced, the centrifugal force is reduced, and the limiting torque of the shaft connector is reduced along with the reduction of the rotating speed so asto make the motor operate in a power reduction manner and reduce the current to avoid the motor from being overheated and burnt; and the concave-convex curved surface and the transmission column slide when the load is overlarge, the reverse input of the load torque is limited, and reverse electric braking caused by inertia is avoided.

The invention provides a stator structure. The stator structure comprises a stator core and two injection moulded pieces. The injection molded pieces are respectively arranged on two ends of the stator core in an injection moulded manner and each injection molded piece is of an annular structure. Heat dissipation parts for heat dissipation are arranged on the injection molded pieces. Due to the heat dissipation parts, surface area of the stator structure is increased and then heat dissipation area of the stator structure is increased, thereby facilitating heat dissipation of the stator structure, reducing temperature rise speed of the stator structure, reducing temperature of a motor, preventing the motor from being burnt down by overheating and ensuring usage performance of the motor. According to the stator structure, heat dissipation area is increased through the heat dissipation parts, so heat dissipation speed of the stator structure is accelerated, temperature rise speed of the stator structure is reduced, a problem of a fast temperature rise caused by poor heat dissipation is effectively solved and the stator structure is easy to use. The invention also provides the motor.

The invention discloses a differential rotating bed continuous feeding biomass gasification furnace, and mainly relates to the technical field of energy science. The furnace comprises a furnace body,an air distribution disc and an air disc driving device for driving the air distribution disc to rotate are arranged in the furnace body, the furnace body comprises a cylinder body and a cylinder bodysupport located on the outer side of the cylinder body and used for supporting the cylinder body, an ash bin is arranged on the lower side of the cylinder body, and an ash bin driving device for driving the ash bin to rotate is arranged on the cylinder body support. A blanking pipe is arranged at the top of the furnace body, a conical distributor is arranged on the lower side of the blanking pipe, a spiral sealing feeder is arranged at the top of the blanking pipe, a buffer bin is arranged at the top of the end, away from the blanking pipe, of the spiral sealing feeder, and a feeding barrel with the closed bottom end is obliquely arranged on one side of the buffer bin. The biomass gasification furnace can realize continuous sealed feeding in the gasification process, can effectively prevent partial burning deviation and burning through, is easy to control the thickness of an ash layer, can enhance the disturbance of biomass in the furnace, and improves the gasification strength.

The invention discloses a plastic package type triode and a manufacturing process. The triode comprises a triode body, a first cooling fin, a first fixing plate, a first fixing rod, a second fixing rod, a first V-shaped groove, a first pin, a second pin, a second V-shaped groove, a third pin, a third V-shaped groove, a movable plate, a locking rod, a first through hole, a locking block, a second through hole, a first fixing block, a fixing shaft, a connecting groove, a mounting groove, a fixing ring, a spring, a limiting block and a guide rod. Through installation of the dustproof cover, the phenomenon that the triode body is burnt down due to the fact that dust absorbs moisture in air is avoided, through clamping connection of the locking block and the first through hole in the movable plate, the dustproof cover is rapidly put down and put away, and through installation of a first cooling fin and a second cooling fin, the cooling performance of the device is improved. By forming the first V-shaped groove, the second V-shaped groove and the third V-shaped groove, manual breaking of the first pin, the second pin and the third pin is achieved.

The invention discloses a solenoid valve with a power reduction function. A power reduction module is arranged at the front end of a solenoid valve coil; a main power source voltage detection system and a voltage conversion system are arranged inside the module; the main power source voltage detection system and the voltage conversion system are respectively connected with a single-chip microcomputer control system; the single-chip microcomputer control system outputs voltage through duty cycle of a power pipe; the single-chip microcomputer control system outputs pulse voltage with the pulse voltage frequency being 20KHZ and the cycle period being 50uS. A circuit controlling method disclosed by the invention comprises the following steps: providing direct current voltage for the power reduction module; inputting one path of voltage into the single-chip microcomputer control system through the main power source voltage detection system and inputting another path of voltage into the single-chip microcomputer control system after the voltage is reduced by the voltage conversion system; the single-chip microcomputer control system outputs the duty cycle of the voltage to the solenoid valve coil through the power pipe, and triggering the solenoid valve to act. According to the solenoid valve disclosed by the invention, the power is supplied intermittently to the solenoid valve coil, so that the heat power of electromagnetic coils is reduced, and the safe and reliable operation of the solenoid valve is guaranteed.

The invention belongs to the technical field of clothing production equipment, and particularly relates to a clothing sandblasting-pattern processing method and device. In view of the problem that cloth ironing and conveying are inconvenient to perform, fine sand left on cloth cannot be effectively removed and temperature problems exist for existing clothing sandblasting-pattern processing equipment, the clothing sandblasting-pattern processing method is provided and includes the following steps that S1, a transmission mechanism is arranged, a conveying mechanism is used for conveying cloth needing sandblasting; S2, an ironing and conveying mechanism is arranged on the conveying mechanism, the clothing sandblasting-pattern processing device includes a machine frame and a dust shield, the inner side of the machine frame is rotatably provided with a plurality of conveyor rolls, the piece of cloth is placed on the conveyor rolls, and an ironing platform is arranged between the two conveyor rolls located on the leftmost side. The design is reasonable, wrinkles on the cloth can be effectively removed, a sandblasting pattern is formed on the cloth, the cloth can be subjected to cooling sand removal treatment, cloth cleaning is facilitated, and the cloth is effectively prevented from overheating and deformation.

A self-adaptive regulation and control supercritical hydrothermal combustion type multi-element thermal fluid generation system comprises a reactor, a material pretreatment module, an oxidizing agent supply module, a cooling module, a temperature and pressure regulating module and the like, and the reactor, the material pretreatment module, the oxidizing agent supply module and the supercritical hydrothermal combustion reaction module are used for generating multi-element thermal fluid; the pressure and the temperature of the multi-element thermal fluid are adjusted through the temperature and pressure adjusting module, the wall face of the reactor is protected through the cooling module, the multi-element thermal fluid meeting the exploitation requirement is safely and stably produced, and a feasible scheme is provided for efficient exploitation of thickened oil.

The invention discloses an energizing protection method of a contactor. The energizing protection method comprises the steps of obtaining environment temperature when an instruction for energizing the contactor is received; enabling the contactor to perform anti-freeze action through control when the environment temperature is smaller than or equal to first preset environment; enabling the contactor to be in a normal working state when the environment temperature is larger than the first preset environment. The invention further discloses an energizing protection method of the contactor. The energizing protection method and device achieve the protection purpose when the contactor is energized, contactor overburning can be prevented, and later-period device maintenance is reduced.

The invention relates to a divided-flow vacuum pump unit water cooling device which comprises a main water inlet pipe, a plurality of vacuum pump cooling units and a main control valve. Each vacuum pump cooling unit comprises a water inlet branch valve, a water inlet branch pipe, a vacuum pump, a water outlet branch pipe and a water outlet branch valve. The water inlet branch pipe is connected on the main water inlet pipe through the water inlet branch valve, the water outlet branch pipe is connected on the main water inlet pipe through the water outlet branch valve, and the main control valve is arranged between the water inlet branch pipe and a joint of the water outlet branch pipe and the main water inlet pipe. Compared with the prior art, the cooling water quantity consumed by the vacuum pump cooling device with the structure is saved by 60-70% on the premise of ensuring the normal work of the vacuum pump; and not only can the increased temperature of the vacuum pump be ensured to be lower than the standardized operating temperature of the vacuum pump, but also water resources are greatly saved.

The invention belongs to the technical field of metal material and particularly relates to a preparation technology of high-strength corrosion resistant aluminium alloy. The preparation technology comprises the following steps: S1, feeding the raw material for preparing aluminium alloy in the crucible of a preparation device, sealing the preparation device, and feeding a refiner in the mixer of the preparation device; S2, on the basis of S1, starting the preparation device and raising the temperature of the preparation device until all raw materials in the crucible melt; S3, on the basis of S2, feeding nitrogen and the refiner in the preparation device to carry out dehydrogenation and refining on molten aluminium alloy; S4, on the basis of S2, starting an ultrasonic generator to carry outultrasonic treatment on the molten aluminium alloy in the crucible; and S5, on the basis of S4, pouring the molten aluminium alloy in the crucible in a casting mould, and naturally cooling the castingmould to a normal temperature. According to the preparation technology, all elements in aluminium alloy have mutual synergistic effect to enhance strength, ductility, corrosion resistance and wear resistance of aluminium alloy.