30results about How to "Simple pressure control" patented technology

The invention relates to an active hydraulic damper specially for railway vehicles, comprising a hydraulic cylinder, an electric motor, a hydraulic accumulator, at least a pump and at least a control valve. According to the invention, all components of the active hydraulic damper are arranged at the hydraulic cylinder.

The invention provides a control method for a pressure cooker and the pressure cooker. The control method for the pressure cooker comprises the following steps: detecting temperature in the pressure cooker, and controlling heating power of the pressure cooker in accordance with temperature, which is detected out, in the pressure cooker and a set temperature range, so that the pressure cooker workswithin a preset pressure range which corresponds to the set temperature range; and controlling the pressure cooker to work under a rated working pressure. According to the technical scheme, the heating power of the pressure cooker can be controlled in accordance with a relation between the detected temperature in the pressure cooker and the set temperature range before or after the pressure cooker is heated to the rated working pressure, so that the pressure cooker can work within the preset pressure range corresponding to the set temperature range, namely the pressure cooker can work both under the rated working pressure and within the preset pressure range; therefore, in an actual cooking process, multi-stage pressure cooking can be conducted on foods in accordance with the properties of the foods, so that the cooking effect and taste of the foods are guaranteed, and subsequently, user experience is enhanced.

The invention relates to a hydraulic buffer system, which comprises a hydraulic cylinder, an oil storage tank, a first one-way valve, a second one-way valve, a third one-way valve, a forth one-way valve, a first hydraulic damper, a second hydraulic damper, a first electromagnetic valve and a second electromagnetic valve, wherein the hydraulic cylinder comprises a cylinder sleeve, a piston and a piston rod; the piston slides in the cylinder sleeve; and the hydraulic cylinder is divided into a buffer cavity and a locking cavity through the piston. The system has an ingenious design, a simple and compact structure, low production cost and a good buffering effect and is convenient to maintain when used on a vehicle; an oil discharge circuit is provided with a constant-value hydraulic damper, so that a resistance buffering effect which is proportional to the corner velocity of the vehicle is achieved; and the on-off of an oil circuit of the locking cavity is controlled through the electromagnetic valves, so that the vehicle has the functions of locking corner surpassing and recovering direct movement at the same time.

The invention relates to a pressurizing and locking hydraulic buffer system, belonging to the field of hydraulic buffer. The system comprises a hydraulic cylinder and an oil storage tank, wherein the hydraulic cylinder comprises a cylinder sleeve, a piston and a piston rod; the hydraulic cylinder is divided into a first chamber and a second chamber by the piston; a first oil extraction oil line and a first oil absorption oil line are communicated by virtue of the first chamber and the oil storage tank; the pressurizing and locking hydraulic buffer system also comprises at least one overflow valve, at least one electromagnetic valve and at least one hydraulic damp; and the overflow valve and the electromagnetic valve are connected in parallel in the first oil extraction oil line and a second oil extraction oil line. The supercharging and locking hydraulic buffer system provided by the invention has the advantages of skillful design, simple and compact structure, low failure rate and good buffer effect; through setting the constant hydraulic damp, the resistance force buffer effect is achieved in proportion to the cornering speed of a vehicle; and as the overflow valve is arranged, the vehicle is enabled to be provided with the functions of super angle locking and safe protection.

Provided is an elastic membrane, precisely adjusting a polishing profile with respect to an edge portion of a substrate. The elastic membrane comprises: a contact unit (11) allowing the elastic membrane (10) used for a polishing head (1) to come in contact with a wafer (W); a circular side wall (15) installed on the end portion of an outer circumfernece of the contact unit (11) in a standing state; a first partition wall (14f) linearly extending from the side wall (15) inward in the diameter direction when viewed from a cross-section; a second partition wall (14e) linearly extending upward from the end portion of the outer circumfernece of the contact unit (11) to the insdie of the diameter direction when veiwed from the cross-section; and an edge press chamber (16f) pressing the edge of the wafer (W) by the first parition wall (14f), the second partition wall (14e), and the side wall (15).

The invention relates to a constant pressure damping control and buffering system, which belongs to the technical field of hydraulic buffering, and includes a first hydraulic cylinder and a second hydraulic cylinder, as well as a first one-way valve, a second one-way valve, a first one-way overflow valve, a second one-way overflow valve and a pressure regulating valve, wherein a second hydraulic cylinder rodless cavity, a first hydraulic cylinder rod chamber, a first one-way valve, the pressure regulating valve, the first one-way overflow valve, a second hydraulic cylinder rod chamber and a first hydraulic cylinder rodless cavity are sequentially connected in series to form a first oil circuit; and the first hydraulic cylinder rodless cavity, the second hydraulic cylinder rod chamber, the second one-way valve, the pressure regulating valve, the second one-way overflow valve, the first hydraulic cylinder rod chamber and the second hydraulic cylinder rodless cavity are sequentially connected in series through a pipeline to form a second oil circuit. The constant pressure damping control and buffering system has unique design, low manufacturing cost, convenience for maintenance, excellent buffering effect, and the functions of locking and safety protection in case that the turning angle of vehicle is too big.

The invention provides a hot chamber caster for an aluminum alloy in which the casting speed is high and the problem of melting damage to the internal mechanism does not occur even when molten aluminum alloy is used. A molten metal injection main cylinder part (120) made of ceramic is provided in a melting furnace (110). A valve body (150) is provided in the molten metal injection main cylinder part (120) at a position lower than that of an injection path (130). Application and removal of gas pressure of a predetermined pressure in an internal space (123) in the molten metal injection main cylinder part (120) is controlled by a pressurizing unit (160). When the pressurizing unit (160) applies the gas pressure, the valve body (150) moves in a closing direction, and the molten metal in the molten metal injection main cylinder part (120) is die-cast from the injection path (130) into a die (200). When the pressurizing unit (160) removes the gas pressure, the valve body (150) moves in an opening direction, and the amount of molten metal necessary for the next die-casting is fed into the internal space (123).

The invention provides a composite-drive two-stage projectile acceleration device and an experimental platform. The acceleration device comprises a first-stage accelerator and a second-stage accelerator, wherein the first-stage accelerator comprises an electromagnetic valve connected with a high-pressure gas source, the electromagnetic valve is connected with the head end of a shell, a piston is arranged in the shell, manual valves are connected to the shell, the piston is reset by opening the lower manual valve and the upper manual valve, the second-stage accelerator comprises a second-stage accelerator frame, an acceleration pipeline, at least one sliding rail fixed to the second-stage accelerator frame and at least one motor set, the electromagnetic valve controls release of high-pressure gas and pushes the piston to accelerate, the piston pushes a projectile-shaped object to conduct first-stage acceleration to enter the acceleration pipeline of the second-stage accelerator, a motor drives a flywheel to rotate, and second-stage acceleration is conducted on the projectile-shaped object through friction. According to the device, the high-pressure gas and the motor are used as source power, the projectile-shaped body is accelerated by means of a two-stage acceleration mechanism and jetted into a water tank from the acceleration pipeline at a high speed, and a high-speed camera is arranged outside the water tank to record the test process.

The invention belongs to the technical field of petroleum and natural gas drilling pressure control equipment, and particularly relates to a pressure control drilling assisting device. The device comprises a three-way valve connected to an outlet pipeline of a slurry pump, and the other two outlets of the three-way valve are connected with an inlet pipeline and an auxiliary pipeline respectively;the other end of the inlet pipeline is connected with a drill pipe, and the other end of the auxiliary pipeline is connected with an annulus. Compared with the prior art, the device has the followingadvantages that single pipes can be connected, a drill can be put down and a rotary head is maintained under the condition that the pump is not stopped; the constant pressure at the well bottom can bemaintained under the condition that a return pressure pump is not used, the occupied space is reduced, the device can be used for working occasions with limited working space, the installation and maintenance cost is reduced, the complexity degree of a system is reduced, and maintenance is facilitated; the large pump and the return pressure pump can be prevented from being started and stopped frequently, and the energy loss can be reduced; the assisting device can be used for land or ocean control pressure drilling, and simple, safe and reliable well bottom pressure control is realized.

The invention provides a multi-color air jet loom. The multi-color air jet loom reduces the non-uniformity of pressure loss in a pipeline that connects a main nozzle and a main air tank, and can easily control the air pressures of all main nozzles. The multi-color air jet loom (100) includes weft insertion systems (1, 2), wherein each weft insertion system includes at least one main nozzle; main air tanks (11, 12, 13, 14) provided for the weft insertion systems and connected to the main nozzles via pipes; and main valves (31a-31c, 32a-32c, 33a-33c, 34a-34c) directly connected to the main air tanks (11, 12, 13, 14) and connected to the pipes. At least two of the main air tanks (11, 12, 13, 14) are disposed so as to be stacked in a width direction (D) of the multi-color air jet loom.