30results about How to "Change the opening" patented technology

The invention discloses an integrated type electro-hydraulic drive regulating valve and a control method. The integrated type electro-hydraulic drive regulating valve comprises a valve body, a valve element and a valve rod which are connected are arranged in the valve body, the valve rod is connected with a lower piston rod of a double-outlet-rod-symmetrical hydraulic cylinder through a flexible connection sleeve, and a valve position detection sensor is arranged at the top end of an upper piston rod of the double-outlet-rod-symmetrical hydraulic cylinder. In addition, an upper oil port and a lower oil port of the double-outlet-rod-symmetrical hydraulic cylinder are communicated with two oil outlets of a two-way gear pump, and the two-way gear pump is connected with a motor and driven by the motor to operate. A frequency changer is arranged on a common motor and connected with a single-chip microcomputer control unit. The integrated type electro-hydraulic drive regulating valve is small in size and light, the function of controlling the motor is achieved in the mode that the frequency changer is combined with the common motor, the good cost performance is achieved, the output pressure and the flow of an electro-hydraulic drive system can be automatically regulated along with changes of loads, the service life of the regulating valve is prolonged, long-time stable operation of the system is guaranteed, and high reliability is achieved.

The invention relates to the technical field of space propulsion, in particular to a liquid oxygen kerosene pintle injector. The liquid oxygen kerosene pintle injector comprises a shell, an adjusting cylinder and a center rod. The center rod sleeves outside the adjusting cylinder, a first liquid spraying outlet is formed between the adjusting cylinder and the center rod, and kerosene flows through the first liquid spraying outlet to enter a combustion chamber; the shell sleeves outside the adjusting cylinder, a second liquid spraying outlet is formed between the shell and the adjusting cylinder, and liquid oxygen flows through the second liquid spraying outlet to enter the combustion chamber; and the center rod is connected with the shell, and the adjusting cylinder can move in the axial direction relative to the center rod and the shell so that the sectional area of the first liquid spraying outlet and the sectional area of the second liquid spraying outlet can be synchronously changed. According to the liquid oxygen kerosene pintle injector, when the adjusting cylinder moves, the sectional area of the first liquid spraying outlet and the sectional area of the second liquid spraying outlet are synchronously changed, and the momentum of sprayed kerosene and the momentum of sprayed liquid oxygen can be synchronously changed, so that the momentum ratio can be always kept in the optimal state in the thrust changing period, and the injection performance is improved.

The invention discloses a ceiling machine. The ceiling machine includes a casing, an air guiding ring and a plurality of driving devices; wherein, the casing includes a panel assembly, and the panel assembly has an air inlet with an opening downward, and an annular The air outlet located on the periphery of the air inlet; the air guide ring includes a plurality of arc-shaped air guide sections spliced ​​in sequence, each of the arc-shaped air guide sections includes an air guide body and two sides of the air guide body The flexible section at the end, the air guide ring is slidably installed on the panel assembly, so that the air guide ring expands or shrinks radially along the air outlet to adjust the opening of the air outlet; the driving device Installed in the casing and connected to the air guide body to drive the air guide ring to radially expand or contract along the air outlet. The ceiling machine of the present invention can realize the adjustable air volume of the ceiling machine.

The invention relates to a stable-pressure pilot overflow valve. The stable-pressure pilot overflow valve comprises a main valve, a pilot valve and a comparator; a system hydraulic source is respectively acted on valve elements of the main valve, the pilot valve and the comparator; and the comparator is connected with the pilot valve, and performs dynamic adjustment according to the pressure or flow change in an inlet of the overflow valve to enable the pressure acted in an inlet of the main valve to be stable and invariable in an allowed error. When the pressure and the flow in the inlet of the overflow valve are changed, through feedback of the comparator, the flow or pressure change is converted to the displacement of the valve element of the comparator, and is converted to the displacement of the valve element of the pilot valve through a pilot valve spring, so that the control valve port openness of the pilot valve is changed, and the pressure of an upper cavity of the valve element of the main valve is adjusted to cause change of a valve port of the main valve so as to enable the main valve to adapt to the inlet pressure or flow fluctuation. The valve element of the comparator adopts a slide cone valve structure; the valve element of the pilot valve adopts a slide valve structure; and the comparator spring and the pilot valve spring improve the system stability to reduce the squealing probability of the overflow valve.

The invention discloses a fuel cell water content detection device and a control method. The fuel cell water content detection device comprises an edge light-transmitting flow field plate, a fuel cell, a parallel light source, an illuminance sensor, a control unit, an air tank, an electric control switch valve, a regulating valve and an automatic flow meter. The edge of a flow field plate of the fuel cell is transparent through glass and adhesive, and the glass corresponds to a runner of the fuel cell, wherein the parallel light source penetrates through the fuel cell edge light-transmitting flow field plate, and emitted light signals are received by the illuminance sensor. The control unit receives signals sent by the illuminance sensor and the automatic flow meter, the air tank is connected with the electric control switch valve, the regulating valve, the automatic flow meter and the fuel cell, and the control unit regulates the electric control switch valve and the regulating valveto purge the fuel cell according to voltage signals of the illuminance sensor, the automatic flow meter and the fuel cell. The method for detecting and controlling the water content of the fuel cell can accurately meet the purging requirement of the cell in the running process of an automobile according to the water content.

The invention discloses a primary frequency modulation composite control system for a coal-fired unit. The system comprises a condensed water regulating valve, an electric aperture type throttling orifice plate, a throttling orifice plate control device and an integrated master control device, wherein the electric aperture type throttling orifice plate is correspondingly installed between a steamextraction opening of a low-pressure cylinder and one or more low-pressure heaters and is used for regulating the low-pressure steam extraction flow entering one or more low-pressure heaters accordingto a control instruction sent by the throttling orifice plate control device; and when the difference value of power grid frequency fluctuations is greater than a preset difference value threshold, the integrated master control device starts the condensed water regulating valve and the throttling orifice plate control device simultaneously, and the condensed water flow and the low-pressure steamextraction flow which enter the low-pressure heaters are regulated respectively until the power grid frequency returns to be stable. Through the combination of condensed water throttling and low-pressure steam extraction throttling, the problem that loading in an existing condensed water throttling technology is correspondingly slow is solved, and meanwhile the stability and reliability of the heaters are improved.

The invention discloses a magnetorheological valve control damping stepless adjustable shock absorber. The shock absorber is composed of a magnetorheological valve control unit and a hydraulic unit, and the magnetorheological valve control unit is internally provided with a piston rod which is a hollow rod body; a plunger rod sleeved in the piston rod can be axially moved in the hollow rod body; the tail end of the plunger rod is fixedly connected to a support part arranged in a magnetorheological elastomer; the open area of a flow hole in the side wall of the piston rod is changed through movement of the plunger rod, namely that the opening degree of a variable valve hole is changed; and coils are arranged and used for providing a closed magnetic field for controlling the rigidity of themagnetorheological elastomer. According to the shock absorber, the opening degree of the variable valve hole is controlled through change of the rigidity of the magnetorheological elastomer, and the output of real-time stepless controllable damping force is achieved.

The invention discloses an adjustable fireproof valve which comprises a base, wherein a fireproof valve shell is arranged at the top end of the base, a controller is arranged at the top end of one side of the fireproof valve shell, and a temperature sensor and a smoke sensor located below the temperature sensor are arranged on one side of the inner wall of the fireproof valve shell; a rotating motor is arranged on one side of the fireproof valve shell and located below the controller, an output shaft of the rotating motor is connected to a rotating shaft, a rotating plate is arranged on the rotating shaft in a sleeving manner, a rotating column is arranged on one side of the top end of the rotating plate, first rotating rods are symmetrically arranged in the fireproof valve shell, and first rotating doors, second rotating doors and first rotating gears are arranged on the first rotating rods in a sleeving manner; and the first rotating gears are located between the first rotating doorsand the second rotating doors, and second rotating rods located on one sides of the first rotating rods are symmetrically arranged in the fireproof valve shell. The adjustable fireproof valve has thebeneficial effects that the fireproof valve is further closed, the aperture of the fireproof valve is effectively changed, the aperture of the fireproof valve is conveniently adjusted, and the safetyis greatly improved.

The invention discloses a stable opening and closing structure for a high precision flow valve. The stable opening and closing structure comprises a solenoid coil, a base, a ring seat, an opening andclosing assembly and a spring piece; the spring piece is located above the base, and the ring seat and the opening and closing assembly are located between the base and the spring piece; the opening and closing assembly is located on the inner side of the ring seat; the opening and closing assembly comprises a movable piece and a sealing ring fixedly arranged at the bottom of the movable piece; and the solenoid coil is located on the upper side of the spring piece. According to the scheme, a valve intake control structure is optimized, and the ring seat is arranged at the position of the movable piece, and plays a certain role in lifting of the movable piece, so that the movable piece is not deflected in the intake process; air can enter the lower side of the movable piece, and the workingstability of a solenoid valve is ensured; upward suction is generated for the movable piece by the solenoid coil, and downward elastic force is generated for the movable piece by the spring piece; the height of the movable piece can be fine-tuned, so that the opening degree of the valve is changed; the sealing ring is arranged at the bottom surface of the movable piece, and the valve airtightnesscan be ensured after power-off of the coil.

The invention relates to the field of crop planting detection equipment, and particularly discloses a plant morphological index measuring device which comprises a base, a first ventilation seat, a lengthening rod assembly, a linear air cylinder assembly composed of a first air cylinder and a second air cylinder, a first piston block, a sliding seat with a guide wheel, an annular air cylinder assembly and a second piston block. A Bluetooth camera and a host with an air pump and a controller. The lengthened rod set is installed on the base, the linear air cylinder assembly is arranged on one side of the lengthened rod set, the first piston made of a neodymium magnet is installed in the linear air cylinder assembly, and the sliding seat is attracted through the first piston to drive the annular air cylinder assembly to move up and down along the linear air cylinder assembly; the second piston block and the Bluetooth camera can reciprocate along the annular air cylinder, panoramic scanning is carried out on the plant, finally, the whole image of the plant is synthesized and displayed through the controller, and the device can carry out three-dimensional scanning imaging on the plant and is good in portability and high in measurement precision.

The invention provides an adjustable coal mill separator which comprises a shell, a coarse material return hopper is arranged in the middle of the shell, a discharging pipe is arranged in the middle of the coarse material return hopper, a plurality of discharging pipes are arranged on the top face of the shell, an adjustable stator blade cage mechanism is arranged on the top face of the coarse material return hopper, and a plurality of adjustable blades are arranged on the top face of the adjustable stator blade cage mechanism. A rotor blade cage mechanism is arranged in the middle of the adjustable stator blade cage mechanism, the angle of a stator guide vane is adjusted through the adjustable stator blade cage mechanism, so that the opening degree of the stator guide vane is changed, and the fineness of pulverized coal is adjusted; an operator can conveniently check the angle of the current stator guide vane through the adjusting angle indicating mechanism, so that the angle is accurately controlled and adjusted, the aerodynamic effect of the stator vane cage and the rotor vane cage is further enhanced through the vanes with arc-shaped cross sections, and the service life of the stator vane cage and the rotor vane cage is prolonged. Therefore, the air suction amount can be controlled by adjusting the rotating speed of the rotor driving motor, and adjustment of the pulverized coal concentration is achieved.

The invention relates to a tool for fixing opening of a diaphragm type regulating valve. The tool comprises a rectangular fixing plate A, two long-strip shaped fixing plates B, two U-shaped screw rodsand positioning nuts, wherein the U-shaped screw rods are formed through bending according to the diameter of an oil tube; threads are formed in the U-shaped screw rods and are matched with the positioning nuts; when the tool is used, the two U-shaped screw rods are mounted on the upper and lower sides of the diaphragm type regulating valve separately; two positioning nuts are arranged at one endof each of the U-shaped screw rods in a sleeving manner; the two fixing plates B are mounted on the U-shaped screw rod at the bottom of a valve handle; the fixing plate A is mounted on the U-shaped screw rod at the top of the valve handle; and the external part is fixed by the positioning nuts. With adoption of the tool, the flow rate of the oil inlet pipe of a main pump does not change or has abnormality, the opening is kept stable, and a pump unit stably operates for two reactor-year, so that safety of the main pump and a reactor is effectively ensured. The tool has reference significance for fixing a pressurized water reactor main pump lubricating oil valve.