32results about How to "Guaranteed reliable operation" patented technology

The invention provides a redundancy electro hydraulic servo system, which is an electro hydraulic servo system controlled by a dual-flux servo valve or a dual-servo proportion valve. By a two-position two-way electromagnetic valve, a controllable parallel connection between the two valves is realized, the dynamic adjustment of the control scheme is realized, and the realization of the load motion speed and index is achieved, thus achieving the objects of high efficiency and energy-saving control and simultaneously improving the reliability of the system.

The invention provides a control method, a control device and a control system for the initial opening degree of an electronic expansion valve. The control method comprises the steps that S1, an outdoor environment temperature T is detected; S2, according to a preset P-T relation, an initial opening degree value P, corresponding to the outdoor environment temperature T, of the electronic expansion valve is calculated; and S3, the electronic expansion valve is operated to the corresponding value P. According to the control method, the control device and the control system for the initial opening degree of the electronic expansion valve, the outdoor environment temperature T is detected and the initial opening degree value P of the electronic expansion valve is calculated according to the preset P-T relation, so that it is guaranteed that a compressor can establish superheat degrees of exhausting and oil temperature at low temperature quickly, pressure relieving at high temperature is ensured at the same time, and reliable operation of the compressor and a complete machine is ensured.

The invention discloses an asynchronous motor frequency converter device with low-voltage ride through capability. An alternating-direct-alternating mode is adopted for a frequency converter, namely, firstly converting a working frequency alternating power supply into a direct current power supply by a rectifier; and then converting the direct current power supply into an alternating power supplywith controllable voltage and frequency through an inversion link and providing the alternating power supply to an asynchronous motor. A diode rectification module in the inner part is switched in after the working frequency alternating power supply is switched in the frequency converter; the alternating current is converted into direct current; the output of a rectifier bridge is switched into aBOOST module; the output of the BOOST module is switched into the input of a DC / AC (direct current / alternating current) inverter module; and the output of the inverter module, serving as an alternating current supply, is directly supplied to the asynchronous motor. Under the normal condition, the BOOST module is not started, when the drop of the power grid voltage is detected, the BOOST module starts automatically, sufficient direct current voltage sources for the inversion link are ensured, and the stable operation of the asynchronous motor is ensured.

The invention relates to a monitoring and control method of an air conditioner energy saving system. A monitoring system host machine reads indoor temperature, indoor humidity, outdoor temperature and outdoor humidity through an indoor temperature and humidity detection module and an outdoor temperature and humidity detection module. When the difference between the indoor temperature and the outdoor temperature and the difference between the indoor humidity and the outdoor humidity are larger than preset startup values, the monitoring system host machine drives an energy saving unit control module to start up an energy saving unit; and when the difference between the indoor temperature and the outdoor temperature and the difference between the indoor humidity and the outdoor humidity are smaller than preset shutdown values, the monitoring system host machine drives the energy saving unit control module to shut down the energy saving unit. Since the startup or the shutdown of the air conditioner energy saving unit is judged according to preset conditions through detecting the indoor temperature, the indoor humidity, the outdoor temperature and the outdoor humidity, the invention has the advantages that the state of the air conditioner is not required to be detected and controlled, the air conditioner and the energy saving unit can run independently, the control is simplified, the air conditioner can run independently even though the energy saving unit monitoring system is failed or the energy saving unit can run independently even though the air conditioner is failed, and the reliable operation of the communication device is ensured.

The invention belongs to a detection technique of electric equipment, which relates to the detection of a direct-current switch cabinet supplying power to an urban rail traffic direct-current traction engine, in particular to a line test device and a test method of a direct-current traction power supply switch cabinet. The line test device and the test method are characterized in that a detection line is respectively led out from the main bus-bar side and the feeder line side of a direct-current breaker in the line, wherein the detection line which is led out from the feeder line side is connected to the cathode of a bus bar by an adjustable resistor A651, and the detection line which is led out from the main bus-bar side is connected to the cathode of the bus bar by an adjustable resistor R653, a contactor K and the adjustable resistor A651 sequentially; and a voltage amplification signal is output to a protection device through signals which are led out from both ends of the adjustable resistor A651 by a measuring amplifier. When a direct-current traction power supply system carries out the normal breaker switching-on operation, the invention can test the line for many times, closes the contactor K when required for carrying out further judgment, enhances the accuracy of a test result, ensures the reliable operation of the direct-current traction power supply switch cabinet and has convenient and accurate test process.

The invention discloses an air conditioner, and an overheating protection method and an overheating protection device of a power device in the air conditioner. The power device comprises a rectifier bridge, a power switching tube, a diode and an intelligent power module (IPM); and the power device undergoes heat dissipation through a refrigerant radiating pipe. The overheating protection method comprises the following steps: a pipe temperature of the current refrigerant radiating pipe is acquired; and target running frequency of a compressor in the air conditioner is adjusted according to the pipe temperature of a current refrigerant radiating pipe in order to allow the power device to work within a safe working temperature range. The target running frequency of the compressor in the air conditioner is adjusted according to the pipe temperature of the current refrigerant radiating pipe in order to allow the power device to work within the safe working temperature range, so that the problem that the power device is damaged due to overheating is solved effectively, and reliable operation of the air conditioner is ensured.

The invention discloses a routing method of a wireless sensor network. The method comprises that newly-powered-on sensor nodes obtain network addresses, up routing paths and down routing paths and become access nodes; every access nodes obtains the residual power capacity to perform network maintenance; the access nodes become powered-off nodes when powered off to a standby mode to perform network reconstruction. During the process that new nodes join in the network and the network reconstruction, due to the fact that every node does not need to storage the relevant information of the neighboring access nodes, a gateway takes charge of associating every node and the neighboring access nodes, and by means of path weight parameters, the gateway can evaluate the connecting quality of every path more easily, further, when the network changes, the gateway can generate optional paths, by comparing the path weight parameters, rapidly select out the optimal path which can balance flow distribution and energy consumption and timely issue the transmission path to a requested node for usage, the reliable operation of the network can be guaranteed and the service life of the network can be prolonged.

The invention discloses a control method for the staggered PFC of an air conditioner. The staggered PFC comprises a main branch and an auxiliary branch. The control method comprises the following steps of S1, detecting the current working states of the main branch and the auxiliary branch, and reading the set states of the main branch and the auxiliary branch, which are stored inside a storage; S2, according to the current working states and the set states of the main branch and the auxiliary branch performing switching control on the main branch and the auxiliary branch. The control method for the staggered PFC of the air conditioner can help automatically switch the main branch and the auxiliary branch of the staggered PFC, prolongs the service time of the staggered PFC and improves the reliability of the air conditioner. The invention also discloses a control device for the staggered PFC of the air conditioner.

The invention relates to an inner closed type radial flux magnetic transmission mechanism for an underwater direct-driven propeller. According to the inner closed type radial flux magnetic transmission mechanism for the underwater direct-driven propeller provided by the invention, the opening end of the inner circumference surface of an outer rotor iron core (1) is equipped with multiple dovetail slots II (12) along a radial direction; the multiple dovetail slots II (12) are evenly distributed along the inner circumference surface of the outer rotor iron core (1); a piece of outer rotor magnetic steel (2) is matched and fixed in each dovetail slot II (12); an inner rotor end plate (10) is annularly sleeved on the prime motor rotation shaft (9) of the propeller and is fixedly connected with the outer end of an inner rotor magnet yoke (5); an outer rotor end plate (8) is fixedly connected with the outer end of the outer rotor iron core (1); the opening end of an isolation sleeve (3) is equipped with a connection flange plate (16); and the connection flange plate (16) of the isolation sleeve (3) and a propeller end plate (7) are in sealed connection. The mechanism provided by the invention is applied in the underwater direct-driven propeller.

The present invention discloses an online monitoring device for an electrical switch cabinet state based on multidimensional feature parameters for realizing real-time monitoring for key point temperature, a partial discharge state and an operating mechanism state of a high voltage switch cabinet. The online monitoring device for an electrical switch cabinet state based on multidimensional featureparameters comprises a switch cabinet, a temperature sensor, an intelligent data collector, an intelligent communication terminal, an intelligent master station, a big data server, a computer, a mobile terminal, a DC 12V power adapter, an AC transformer, a Hall current sensor, a vibration sensor, a TEV ground wave sensor, an AE ultrasonic sensor, a panel antenna, a feedback line and a remote system master station. The online monitoring device for an electrical switch cabinet state based on multidimensional feature parameters can be adopted to effectively avoid cable joint fault, bus fault, contact fault, operating mechanism fault, etc., can effectively ensure reliable operation of switch cabinet equipment, and can ensure safe and stable operation of a power grid.

The invention discloses an intelligent debugging system for intelligent substation automation equipment and an application method thereof. The intelligent debugging system for intelligent substation automation equipment comprises intelligent debugging equipment and an intelligent acceptance signal simulation device. The intelligent debugging equipment is connected with the intelligent acceptance signal simulation device, a station control layer network of an intelligent substation and a telecontrol machine of the station control layer of the intelligent substation. The intelligent acceptance signal simulation device is connected with a spacer layer network and a process layer network of the intelligent substation. The application method comprises automatic closed-loop test of remote measurement, remote signaling, remote control and the like of the intelligent substation. Automatic closed-loop remote signaling, remote measurement and remote control preset tests of the whole station canbe achieved through longitudinal cross-layer network data analysis. The system can realize comprehensive automatic test of all functional indexes and performance indexes of spacer layer equipment andstation control layer equipment, so that fault reasons and fault positions can be visually and accurately located, the acceptance quality and efficiency of the intelligent station can be improved, andreliable operation of the intelligent station can be guaranteed.

The invention discloses a self-adaptive defrosting control method of an air-cooled heat pump system. The self-adaptive defrosting control method is characterized by comprising the following steps of:setting four control parameters: (1) setting a defrosting time set value; (2) setting a temperature difference value entering a defrosting cycle; (3) setting a fin temperature exiting the defrosting cycle; and (4) setting an interval time (defrosting cycle) of two defrosting cycles, comparing actual defrosting time with set defrosting time, recording a ratio of the actual defrosting time to the set defrosting time each time, setting an interval according to a ratio range, determining a defrosting interval time according to an interval range to which the defrosting interval time belongs, takingtwo times of defrosting time as a correction interval, adjusting the set value of the defrosting interval time according to two defrosting time intervals recorded by the current times and the previous times, and continuously correcting the defrosting cycle to enable the defrosting cycle to automatically adapt to the change of the temperature and humidity of the environment with a self-correctionvariable step length.

The invention discloses an air-cooled permanent-magnet coupler and a method for cooling the same. On the basis of the gas film technique, an isolation gas film is formed between a copper conductor and a permanent-magnet rotor in an air-cooled permanent-magnet coupler. Therefore, while the copper conductor and the permanent-magnet rotor are cooled, heat transferring between the copper conductor and the permanent-magnet rotor is isolated, so that the cooling efficiency and degree are increased and thus reliable operation of the permanent-magnet coupler can be guaranteed.

The invention discloses a rotary vane type vacuum pump, and provides the rotary vane type vacuum pump with a canned motor. According to the rotary vane type vacuum pump with the canned motor, pump oil and motor coils are completely isolated, the safety and the reliability are high, the secondary starting load is small, the service life is long, the energy conservation and environmental protection performance is high, and the problems that secondary starting of vacuum pumps is difficult after stopping, high-power motors need to be arranged, the energy consumption is high, rotary vanes are easily broken and the service life of the vacuum pumps is influenced in the prior art are solved. The rotary vane type vacuum pump with the canned motor comprises a support, a pump body and an auxiliary fuel tank, wherein the pump body and the auxiliary fuel tank are arranged on the support and the auxiliary fuel tank is arranged outside the pump body in a covering mode; the canned motor and a main fuel tank are arranged under the support, the main fuel tank is arranged at the lower end of the canned motor in a covering mode and horizontally supports the canned motor, a shielding cover pipe is arranged outside a motor rotor shaft of the canned motor in a spaced sleeving mode, the upper end of the shielding cover pipe communicates with the auxiliary fuel tank through a support oil inlet channel and a pump cavity of a pump body, the lower end of the shielding cover pipe extends for communicating with the part under the fuel level of the main fuel tank, and the auxiliary fuel tank arranged outside the pump body correspondingly communicates with the main fuel tank through an oil return pipe.

The invention relates to a pure-electric sanitation sweeping vehicle and an automatic driving system thereof. The automatic driving system comprises a power battery, a control module, a vehicle body peripheral obstacle detecting subsystem, a roadside distance detecting subsystem, an electric-control steering subsystem and a braking subsystem. The situation of obstacles around a vehicle body is detected by the vehicle body peripheral obstacle detecting subsystem, the distance between the vehicle and the roadside is detected by the roadside distance detecting subsystem, in the automatic drivingprocess, the vehicle is automatically controlled to travel according to the situation of the obstacles around the vehicle body and the distance between the vehicle and the roadside, when normal traveling of the vehicle is affected by the obstacles or the vehicle is too close to the roadside, the vehicle steering subsystem or the braking subsystem is controlled to achieve steering or decelerating of the vehicle, thus the obstacles are avoided or the distance between the vehicle and the roadside is increased, and safe and reliable operation of automatic driving is achieved. Therefore, automaticdriving control over the pure-electric sanitation sweeping vehicle can be achieved through the automatic driving system.

The invention provides an access control device having three operating systems. The access control device comprises a first virtual machine, a second virtual machine, a third virtual machine and a system switching unit. An embedded system is running on the first virtual machine; a first backup system is running on the second virtual machine; and a second backup system is running on the third virtual machine. The first virtual machine is used for carrying out a normal system state. The second virtual machine and the third virtual machine are used for carrying out backup system states. The system switching unit is used for monitoring the states of the first virtual machine, the second virtual machine and the third virtual machine; and the system switching unit selects one virtual machine from the second virtual machine and the third virtual machine to carry out a dynamic switch with the first virtual machine when it is monitored that the first virtual machine is crashed, so as to take place of the normal system state of the first virtual machine; and the other one of the second virtual machine and the third virtual machine is utilized for recovering the first virtual machine into the backup system state. The access control device having the three operating systems is able to keep controlling the access when the operating system is crashed.

The invention provides an open circuit-resistant aviation socket, comprising a socket shell. The center of the socket shell is provided with a through hole in which a front cover and a rear cover thatare arranged at intervals are arranged in the through hole, a middle cover capable of sliding along the axial direction of the through hole is arranged between the front cover and the rear cover, a plurality of insertion needles are fixed on the rear cover, the middle cover is provided with a plurality of insertion needle holes, the needle heads of the insertion needles pass through the insertionneedle holes in the middle cover and the front cover and are positioned in the through hole, a reset spring is arranged between the middle cover and the rear cover, a surface, which faces the front cover, of the middle cover is provided with a push rod which passes through the front cover, and is further provided with a short circuit slot which is communicated with an insertion needle hole position for a short circuit insertion needle, a conductive short circuit component is paved at a slot bottom of the short circuit slot, an insulating cylinder is arranged at an orifice of the insertion needle hole in the slot bottom of the short circuit slot, and one end, which faces the front cover, of the insulating cylinder is successively provided with a copper flat gasket and a contact spring. Before insertion, the open circuit-resistant aviation socket can be used for performing short circuit on a certain insertion needle, and after the insertion, the short circuit insertion needle can be automatically switched off.

The invention belongs to the technical field of power equipment maintenance, and discloses a power transmission and transformation monitoring and maintenance system and method. The power transmission and transformation monitoring and maintenance system adopted by the method comprises a monitoring and maintenance aircraft, wherein the monitoring and maintenance aircraft is composed of a monitoring device, a clearing device, and a flying device; one side of the lower part of the flying device is provided with the monitoring device, and the other side of the lower part of the flying device is provided with the clearing device; the monitoring device is composed of a detector and an actuator; the clearing device is composed of a telescopic mechanism; and the outer end of the telescopic mechanism is provided with a hook claw. The power transmission and transformation monitoring and maintenance system and the method provided by the invention can monitor the problems of lightning strike or external damage on electric transmission and distribution circuits in a running process, can clear bird's nests and stay wires through the hook claw on the telescopic mechanism of the clearing device to maintain power transmission and transformation, and can guarantee the reliable operation of electric transmission and transformation equipment.

The invention belongs to the field of environment protection equipment, and relates to a device for flue gas purification, wherein the device can remove sulfur, fluorine, and dust from flue gas. The device comprises a reactor, which is nested in a shell; the upper end of the reactor is a glue gas inlet, the lower end of the reactor is communicated with the inner cavity of the shell through a water and mist remover, and the shell is provided with a flue gas outlet. The structure of the device is characterized in that the reactor is separated into two sections, a separating part is arranged between two sections of reactor, the separating part is communicated with a dedusting cavity in the upper part of the inner cavity of the shell; the bottom of the dedusting cavity is provided with an enclosed partition plate, which partially separates the dedusting cavity from the flue gas outlet arranged in the lower part of the inner cavity of the shell, and the shell of the lower part of the dedusting cavity is provided with an ash outlet which is controlled by a valve. The provided device largely reduces the dusts that enter the post-treatment equipment; thus the reliable operation of post-treatment equipment can be guaranteed, at the same time, the operation and maintenance are convenient, and the effect on removing sulfur and fluorine is improved.

The invention relates to a converter power module and a water-cooling radiator thereof. The water-cooling radiator for the converter power module comprises a cooling liquid pipeline connector arranged at the top; a groove is formed in the top of the water-cooling radiator; the cooling liquid pipeline connector is arranged at the bottom of the groove; a water guide channel is formed in the top of the water-cooling radiator; one end of the water guide channel is communicated with the groove; the other end of the water guide channel extends to the side surface of the water-cooling radiator; and a water flowing groove communicated with the water guide channel is formed in the side face of the water-cooling radiator and extends to the bottom of the water-cooling radiator. Water seepage at the joint of the cooling liquid pipeline connector and the water-cooling radiator is collected through the groove in the top of the water-cooling radiator, and the water seepage in the groove is guided to the position below an electric appliance element through the water guide channel and the water flowing groove, so that the water seepage is prevented from flowing along the outline of the water-cooling radiator and possibly making contact with the electric appliance element to influence operation of the electric appliance element, and therefore, the reliable operation of the converter power module is ensured.

The invention provides an air conditioner defrosting control method and device and an air conditioner. The air conditioner defrosting control method comprises the steps that the air conditioner is controlled to conduct heating; whether the air conditioner is in a frosting process or not according to the compressor current value Id is judged; when it is judged that the air conditioner is in the frosting process, the frosting state of the air conditioner is determined according to the current exhaust temperature value Td and the current indoor environment temperature value T1; and the air conditioner is controlled to perform corresponding defrosting action according to the frosting state of the air conditioner. The problem that the comfort of the indoor environment is affected due to the fact that defrosting is frequent is solved.

The invention discloses a permanent magnet brushless motor Hall position sensor fault diagnosis method, which is used for solving the technical problem of poor practicability of the existing fault diagnosis method. According to the technical scheme, firstly, the output sequence of three paths of Hall position sensors during the positive and reverse operation of the permanent magnet brushless motoris recognized; then, the current position signals of a permanent magnet brushless motor rotor output by the Hall position sensors, the former position signals of the permanent magnet brushless motorrotor output by the Hall position sensors, and the predicted current position signals and the permanent magnet brushless motor rotating direction of the permanent magnet brushless motor rotor output by the Hall position sensors are collected; meanwhile, whether the output signals are identical or not is predicted according to the current output signals of the Hall position []sensors and the predicated output signals of the Hall position sensor, so that the Hall position sensor fault problem of the permanent magnet brushless motor under the operation work conditions of low rotating speed and frequent positive and reverse rotation is detected; the reliable operation of an airplane full electric braking system is ensured; the practicability is high.

The invention provides a power distribution method of a hydrogen-electricity hybrid power system, and belongs to the technical field of fuel cell automobiles and ships. The number of wavelet decomposition layers and the cut-off frequency of low-pass filtering are associated with the limit variable load rate of the fuel cell by using a Fourier series decomposition method to realize power matching of the fuel cell, so that the fuel cell bears a low-frequency power part, and the auxiliary power supply bears a high-frequency power part; an SOC closed-loop control strategy is adopted to superpose a fine tuning quantity to the output power of the fuel cell, so that an auxiliary power supply is controlled within a normal range, reliable operation of a power system is further ensured, and the control difficulty is reduced.

The invention discloses a starting impact current suppression circuit which comprises a rectifier bridge, a first current-limiting starting circuit, a second current-limiting starting circuit and a Boost circuit. The input end of the rectifier bridge is connected with an alternating current power supply, the output positive end of the rectifier bridge is connected with the input positive end of the first current-limiting starting circuit and the input positive end of the Boost circuit, and the output negative end of the rectifier bridge is connected with the input negative end of the first current-limiting starting circuit and the MOSFET source electrode of the second current-limiting starting circuit; the first output end of the first current-limiting starting circuit is connected with the input end of the second current-limiting starting circuit, and the second output end of the first current-limiting starting circuit is connected with the output negative end of the Boost circuit; the output negative end of the Boost circuit is connected with the drain electrode of the MOSFET of the second current-limiting starting circuit, and the output positive end of the Boost circuit is VOUT. According to the invention, the starting impact current in the power factor correction circuit can be effectively suppressed, the current is limited within 4A, and the reliable operation of the circuit is ensured.

The invention proposes a data compression device and method for a storage system. A hardware compression chip is arranged in the storage system, and the storage system specifically comprises a hardware thread, a software thread and a thread failure monitoring module. By adopting the design scheme of combining the hardware compression chip and the software compression library, the redundancy of thesystem can be improved. Under the condition that the hardware compression chip fails, the system can be automatically switched to the software compression thread. The device has high performance of hardware threads and redundant software threads used for data compression, and reliable operation of a storage system is guaranteed.

The invention discloses a servo central frame and an application method of the servo central frame. A supporting part is mounted on a frame body through a vertical adjusting mechanism; meanwhile, at least the supporting frame is provided with a detection device for detecting that a knife rest gets close so as to control the vertical adjusting mechanism to descend; after the knife rest spans across the central frame, the vertical adjusting mechanism resets; and the supporting part is further provided with an auxiliary supporting device which moves along the supporting part and is vertically guided by the frame body. According to the servo central frame and the application method of the servo central frame, influences on a machining progress are not great under the condition with good supporting.

The invention relates to an automatic limiting protection device for a greenhouse heat preservation roller shutter, and belongs to the technical field of agricultural greenhouse mechanical equipment. The limiting protection device comprises an action obtaining mechanism, a triggering mechanism and a control mechanism, the action obtaining mechanism obtains the ascending / descending terminal action of the greenhouse heat preservation roller shutter, the triggering mechanism is connected with the action obtaining mechanism and moves along with the action obtaining mechanism to trigger the control mechanism, and the control mechanism is used for controlling stopping of the ascending / descending action of the greenhouse heat preservation roller shutter. The control mechanism comprises multiple controllers, the multiple controllers are sequentially arranged on the moving path of the trigger mechanism, and the trigger mechanism can continue to move to trigger the next controller after the previous controller fails until the ascending / descending action of the greenhouse heat preservation roller shutter is controlled to stop. According to the automatic limiting protection device for the greenhouse heat preservation roller shutter, multiple controllers are arranged, limiting protection work can still be continuously provided after the previous controller fails, and application is more reliable.

The invention discloses a helium compressor capable of preventing surge starting under high back pressure, which is positioned in a main bag of an airship and comprises a helium compressor main body, an electric control valve and a check valve, the helium compressor main body is communicated with or separated from the main bag of the airship through the electric control valve, and the check valve is communicated with the main bag of the airship through the electric control valve. And the helium compressor main body is communicated with or separated from the overpressure air bag in the airship main bag through the check valve. By additionally arranging the electric control valve and the check valve and controlling the electric control valve and the check valve in good time, the helium compressor can pass through a surge area and enter a normal working state in an extremely short time when started, damage and harm to equipment caused by surge are avoided, and reliable operation and use of the equipment are guaranteed.