58results about How to "Achieve pressure control" patented technology

Method for controlling a compressor that contains a compressor element, characterised in that during a transition from full load or partial load to zero load, a process A is followed that comprises the following steps:- the reduction of the inlet pressure; - the reduction of the speed and / or the drive torque, and / or during a transition from zero load to partial load or full load, a process B is followed that comprises the following steps: - increase of the speed or drive; and - the increase of the inlet pressure.

The embodiment of the invention provides a measurement unit and an overflow information recognition device and method, and belongs to the field of oil-gas well engineering. The measurement unit comprises a throttling device, sensors and a signal sending device, wherein the throttling device is used for being mounted on a drill rod; the sensors are located on the two sides of the throttling device and used for sensing the pressure and / or temperature of the two sides of the throttling device; and the signal sending device is used for sending the pressure and / or temperature. According to the measurement unit and the overflow information recognition device and method, the throttling device is adopted, the pressure drop and / or temperature difference between the position in front of the throttling device and the position behind the throttling device is measured, overflow information can be well recognized according to the pressure drop and / or the temperature difference, and an extremely good overflow information recognition effect still can be achieved on the occasion that the flow and pressure changes in a horizontal well are not obvious. In addition, the throttling device can monitor overflow and can also increase throttling pressure loss and friction pressure drop, rapid development of overflow is avoided, and the throttling device can assist in achieving control over the pressure of a shaft in the later stage.

A semiconductor device includes an Nch transistor having a first gate electrode and a Pch transistor having a second gate electrode. The first gate electrode and the second gate electrode are made of materials causing stresses of different magnitudes.

The invention relates to a pressure control valve, in particular to a magnetorheological pressure control valve for achieving hydraulic system pressure control through a force required to start the control valve. The pressure control valve comprises an inner valve body, a valve core, a blanking cap, a main valve body, a working chamber containing magnetorheological fluid, a coil assembly composed of a coil and a magnet separation jacket, an outer valve body, an upper valve body, a thrust shaft, a spring seat, a reset spring, an end cap, a travel switch sensor and a plurality of rubber seal rings. The magnetorheological pressure control valve is simple in structure, convenient to manufacture, high in energy efficiency and quick in pressure response and stepless and intelligent control of system pressure can be achieved.

The invention discloses a closed pneumatic type in-vitro positive pulsation and counter pulsation device for servo control and action. The device is formed by adding an in-vitro positive pulsation system of a chest cardiac area into an in-vitro counter pulsation system; a servo motor is provided with a ball screw to form a power system; a closed pressure deformation transmission device is used for transmitting pressure to a human body through the ball screw and pneumatic pressure packets to realize positive pulsation and counter pulsation; and relevant information is acquired, and the positive pulsation and the counter pulsation are precisely controlled through a control system. Compared with the prior art, the closed pneumatic type in-vitro positive pulsation and counter pulsation devicecomprises the following outstanding characteristics that: a cardiac positive pulsation system is added to completely realize the positive pulsation and the counter pulsation; a closed pneumatic system is simple and practical; closed pneumatic pressure is combined with a servo system to simply realize precision and controllability; the closed loop control of the positive pulsation and the counter pulsation is realized by blood flow detection; the pressure control of pneumatic packets is realized by pressure detection so as to control the amount of the positive pulsation and the counter pulsation; and a set of servo pneumatic system is used for the counter pulsation to three groups of pneumatic pressure packets, electrocardial detection is replaced by pulse detection, and the device is convenient to use and has a simple structure.

The invention discloses a welding flux fluid pressure control device, which comprises: a pressure stabilizing pump box, a defoaming valve group and an active conveying component. The interior of the stabilizing pump box is provided with a conveying cavity. The conveying cavity is connected to the inlet port and the outlet port. One side of the pressure-stabilizing pump box is fixedly installed with a drive motor, and the output end of the drive motor is fixedly sleeved with a drive tooth sleeve located inside the conveying cavity. In the present invention, by setting the active pressure compensation structure, the pressure-stabilizing pump box and the active conveying component are used to isolate and block the liquid flow movement at both ends to avoid the mutual influence of the pressure of the liquid flow at both ends, and the uniform motion of the drive motor utilizes the active The change of the cavity between the conveying component and the inner wall of the pressure-stabilizing pump box promotes the positive pressure of the liquid flow to keep the fluid pressure at the flux outlet end constant, and the pressure control can be realized by adjusting the power speed of the drive motor.