38results about How to "Accurate pressure regulation" patented technology

The invention belongs to an experiment device for gas monitoring in a coal mine and particularly relates to a coal and gas outburst jet characteristic simulation experiment device. The upper end of a sleeve (1) is in threaded connection with an upper end cover (2), and the lower end of the sleeve (1) is in threaded connection with a lower end cover (3); a lower pressing plate (7) is installed between the inside of the sleeve (1) and the lower end cover (3); a lower positioning plate (9) is installed between the lower pressing plate (7) and the sleeve (1); a solid pressure measuring plate (10) is arranged on the lower positioning plate (9); an oil cylinder (13) is embedded on the solid pressure measuring plate (10); a hollow side pressing plate (11) is arranged on the lower positioning plate (9) at the right side; upper positioning plates (8) are arranged on the hollow side pressing plate (11) and the solid pressure measuring plate (10); an upper pressing plate (6) is arranged above a coal sample (16); a baffle (5) is arranged above the sleeve (1); a piston rod (4-1) is arranged in a central hole of the baffle (5); and a piston (4) is arranged between the inside of the upper end cover (2) and the baffle (5). The coal and gas outburst jet characteristic simulation experiment device has the beneficial effects that the influence of passively opening an outburst port on outburst energy due to slow speed is avoided, the pressure is kept constant, and the required pressure can be accurately adjusted.

The invention discloses a testing method of a fluid-structure interaction analog simulation testing device. The testing method includes steps of firstly, filling a simulated stratum material in a simulated box body according to the lamellar distribution; filling water by a water filling device and simulating the water-containing layer; then horizontally pressurizing both sides of the simulation box body by a horizontal hydraulic loading system so as to simulate the confining pressure; at last, performing vertical pressure loading on the simulated box body by a vertical directional hydraulic loading system so as to simulate loads with different depths. The testing method of the fluid-structure interaction analog simulation testing device can be adapted to different experimental demands. The testing method can realize accurate pressure adjusting, simulate loads with different depths of the stratum, an apply uneven pressure.

The invention discloses a large-load low-frequency air bag vibration isolator for a ship, which comprises a fixed base and a mounting bottom plate, a limiting box is mounted on the top face of the fixed base, a first vibration isolation air bag is mounted in an inner cavity of the limiting box, the mounting bottom plate is connected to the top end of the first vibration isolation air bag, and a plurality of piston cylinders are symmetrically mounted on the top face of the fixed base; a pressure adjusting piston is installed in an inner cavity of each piston cylinder, the top end of each pressure adjusting piston is connected with a pressure adjusting plate, fixing plates are symmetrically installed on the top faces of the side faces of the two sides of the limiting box, nuts are installed in the centers of the fixing plates, pressure adjusting threaded rods are engaged with the interiors of the nuts, and the bottom ends of the pressure adjusting threaded rods are installed in the centers of the top faces of the pressure adjusting plates through connecting bases; and the inner cavities of the piston cylinders communicate with an inner cavity of the first vibration isolation air bag through first communicating pipes. The large-load low-frequency air bag vibration isolator has the advantages that on the premise that external tools are not used, a user can conveniently and rapidly adjust the air pressure in the air bag, and therefore convenience is brought to air bag air pressure adjustment of the large-load low-frequency air bag vibration isolator for the ship.

The invention relates to a die cutting device, in particular to a flat-press type pressure adjusting device of a die cutting machine and a method thereof. The pressure adjusting device of a die cutting machine comprises a connecting bar connected between a crank and a slide block; the connecting bar comprises two sections; the two sections of connecting bars are integrally docked with each other through a nut / screw rod structure; the device can adjust the pressure of the die cutting machine by adjusting the fastening length of the screw rod; the pressure adjusting method of a die cutting machine comprises the following steps: adjusting the height of a step by grinding a sub nut to eliminate an axial clearance between a main nut and the sub nut as a whole body and the screw rod. The invention provides a pressure adjusting device of a die cutting machine and a method thereof with accurate pressure adjustment.

The invention provides a pressure control device and a pressure increasing and decreasing control method. The pressure control device comprises a power assembly, a transmission assembly and a pressureregulating valve connected in sequence, wherein under the condition that a bidirectional clutch in the transmission assembly is in a first transmission state, when the power assembly moves in the first direction, the bidirectional clutch is engaged to drive the pressure regulating valve to carry out pressurization action, and when the power assembly is reversely reset in the second direction, thebidirectional clutch is separated; under the condition that the bidirectional clutch is in a second transmission state, when the power assembly moves in the second direction, the bidirectional clutchis engaged to drive the pressure regulating valve to perform pressure reduction action, and when the power assembly is reversely reset in the first direction, the bidirectional clutch is separated. By the adoption of the bidirectional clutch, the process of increasing and reducing the pressure of a hydraulic system is realized, the structural assemblies are simplified, and the equipment utilization rate is high; and the pressure control device has the advantages that pressure regulating operation is simple and convenient, occupied mounting space is small, the structural cost is low and energyconsumption is low.

The invention relates to a safety relief temperature controlled electric pressure cooker and a precious voltage controlling method thereof. The temperature controlled electrical pressure cooler comprises a cooker cover, an inner cooker, an outer cooker, an electric heating device and an electric control gear, wherein the cooker cover and the outer cooker can be connected in a detachably fastened mode; the inner cooker can be freely arranged in a cavity formed between the cooker cover and the outer cooker, and a sealing ring is arranged between the inner cooker and the cooker cover; and the cooker cover is provided with an upper temperature detector for detecting the temperature in the inner cooker, an elastic relief device is arranged between the bottom part of the inner cooker and the outer cooker, and the elastic relief device can sense the cooking pressure in the inner cooker so as to drive the inner cooker to move downwards and comprises an elastic member and a strut member for accommodating the elastic member. The precious temperature controlling method comprises a heating stage in which a master controller heats with small power so as to perform temperature compensation based on the temperature deviation deltaT and the reference temperature deltaTB. The invention can improve the temperature control property and voltage control precision of the temperature controlled electric pressure cooker.

The invention discloses a charging circuit with dual output ports, which comprises a primary side conversion circuit, a secondary side first conversion circuit, a secondary side second conversion circuit, and a transformer connecting these three circuits; the output of the secondary side second conversion circuit is sampled The voltage and output current are compared and compensated with the reference value to finally control the on-off time of the switch in the primary side conversion circuit; the output current of the primary side conversion circuit is sampled, and the zero-crossing delay is calculated through zero detection, and then the secondary side is controlled. Second, the on-off time of the rectifier switch in the conversion circuit; the invention also discloses the control method of the charging circuit; compared with the prior art, the invention can flexibly control two direct currents by using a DSP (digital signal processor). The voltage of the output port is precisely adjusted and has strong anti-interference ability; at the same time, it has the advantages of simple structure, convenient setting, small size, low cost and light weight.

The invention discloses a high-voltage transformer with an accurately-controlled transformation ratio. The high-voltage transformer comprises a rotor shaft, a first speed reduction box, an electromagnetic clutch and a voltage acquisition device, wherein the rotor shaft is led out of an upper end of a transformer body, a rotor gear is arranged at the upper end of the rotor shaft, the first speed reduction box is arranged at the upper end of the transformer body, a motor is arranged on the first reduction box, an output shaft of the motor is connected with an input shaft of the first speed reduction box, the motor is connected with a controller of the transformer, the electromagnetic clutch is selectively connected with the rotor gear and an output shaft of the first speed reduction box and is connected with the controller, and the voltage acquisition device is arranged at the output end of the transformer and is connected with the controller. By the high-voltage transformer, the technical problem that the transformation ratio of an adjustable transformer cannot be accurately controlled is solved.

The invention discloses a fluid-structure interaction analog simulation test device, which comprises a rack, a simulation box body, a vertical direction hydraulic loading system and a horizontal direction hydraulic loading system, wherein the rack comprises a base, an upright post, a cross beam and a guide rail; the base is glidingly arranged on the guide rail through the lower surface; the vertical direction hydraulic loading system comprises a first telescopic pressurization device and an upper pressurizing plate; the first telescopic pressurization device performs vertical pressure loading on the simulation box body through the upper pressurization plate; the horizontal direction hydraulic loading system comprises a second telescopic pressurization device, a pressure resistant plate and a lateral pressurization plate; the pressure resistant plate and the side pressurization plate are respectively arranged at the two ends of the second telescopic pressurization device; the second telescopic pressurization device performs the lateral pressure loading on the simulation box body through the butt joint with the simulation box body through the lateral pressurization plate. The test device has the advantages that the horizontal hydraulic loading is modularized; each module can realize the single pressure control; the precise pressure regulation is realized; the top vertical pressurization is controllable; different depth load of the stratum is simulated; non-uniform pressure can be exerted.

The invention relates to the technical field of electric vehicle charging control systems, in particular to a transformer-controlled double-path charging circuit. The circuit comprises an a-end conversion circuit, a b-end conversion circuit, a c-end conversion circuit and a transformer T for connecting the three circuits, the invention further discloses a control method of the transformer-controlled double-path charging circuit. The method comprises the following steps: S1, the controller compares the b-end output voltage and the b-end output current with given output values respectively; andobtaining a result value by inputting a result into a three-pole three-zero-point digital compensator network, wherein the value changes the switching period of an a-end power switch tube and is usedfor controlling the on-off of a first group of power switches Q1 and Q4 and a second group of power switches Q2 and Q3 respectively. The voltage of the two ports can be flexibly controlled by one transformer, the voltage regulation is accurate, and the anti-interference capability is strong; and meanwhile, the circuit has the advantages of small size, low cost and light weight.

The invention discloses a speed regulation control method of air conditioner outdoor fan. The method uses the temperature of conditioner outdoor coil pipe to reflect the system pressure. The RPM regulation and control strategy of the outdoor fan is designed base on the combinational factors of changes of the outdoor environmental temperature and the outdoor coil pipe temperature. Through the control of outdoor fan RPM the outdoor coil pipe temperature can be regulated. Through controlling the outdoor coil pipe temperature within the set range of temperature the system pressure can be stabilized within the scope of the reliable operation of the compressor, therefore the safe operation of the compressor can be guaranteed. Because the precise regulation of the PRM of the outdoor fan can be achieved without the unnecessary pressure sensor installation in the air conditioner system for collecting the system pressure, so the accruement of hardware cost of the product can be avoided. At the same time the stepless speed regulation is used in the outdoor fan to enhance the stability of the system pressure control, and improve the air conditioning system work performance. The method is especially useful for the base station air conditioner to enhance the system operation reliability of the base station air conditioner.

The invention discloses a high-voltage adjustable transformer with an over-travel protection function.The high-voltage adjustable transformer comprises a rotor shaft, a first reduction gearbox, a second reduction gearbox and a voltage collector.The rotor shaft is led out of the upper end of a body of the transformer, and a rotor gear is arranged at the upper end of the rotor shaft.A motor is arranged on the first reduction gearbox, and an output shaft of the motor is connected with an input shaft of the first reduction gearbox.The second reduction gearbox is erected at the upper end of the rotor gear, an electromagnetic clutch is arranged on the second reduction gearbox and connected with the input end of the second reduction gearbox, an input end gear of the second reduction gearbox is selectively connected with an output shaft of the first reduction gearbox, and the output end of the second reduction gearbox is provided with a linkage plate connected with the rotor gear in an engaged mode.The voltage collector is arranged at the output end of the transformer.The technical problem that output voltages cannot be precisely controlled due to over-rotation of the rotor shaft is solved through the transformer.

The invention belongs to the technical field of power voltage regulation, and specifically relates to an automatic voltage regulation device for a substation, which is suitable for a substation. The voltage regulation device includes a sampling and storage unit for sampling voltage information connected to a substation. The sampling and storage unit samples the output voltage of the substation transformer main body voltage output terminal through the sampling circuit, and transmits the information to the processing unit, and the processing unit transmits the information to the control unit, and the control unit compares the received information with the set voltage reference value The parameters are compared, and when the output voltage is not within the range of the voltage reference value, the control unit controls the drive module of the on-load tap changer to drive the motor to perform forward and reverse motions to realize the lifting of the switch gear. The device realizes the automatic, fast and accurate pressure regulation of the station transformer.