21 results about "Pressure control" patented technology

The invention provides an adaptive variable compression engine piston, relating to an engine piston. The invention is characterized in that the piston is composed of a gas mixture combustion pressure control piston lifting system, an oil filling system and a cooling system, wherein the gas mixture combustion pressure control piston lifting system comprises an upper oil chamber (4) consisting of apiston shell (1) and an upper oil pressure piston (2) and a lower oil chamber (28) consisting of the piston shell (1) and a lower oil pressure piston (17); the oil filling system comprises a connecting rod internal oil duct (22), a connecting rod small end oil groove (21), a piston pin internal oil duct (25), a piston lower support internal oil groove (27) and an oil filling check valve (16); thecooling system comprises the connecting rod internal oil duct (22), the connecting rod small end oil groove (21) which is communicated with the piston pin internal oil duct (25) and a cooling oil spray hole (24), and a cooling oil duct (8). The piston can be automatically adapted to the compression ratios of the engine under different working conditions and can greatly enhance gas mixture combustion efficiency and torque under medium and low loads.

The invention discloses a dual negative pressure adjustable wound negative pressure therapeutic instrument based on a microprocessor core, comprising an internal negative pressure source, an internal negative pressure control unit, an external negative pressure interface, a regulating valve, an external negative pressure control unit, a wound Drainage device, negative pressure detection unit, flow rate and flow rate detection unit and alarm unit; internal negative pressure control unit and external negative pressure control unit respectively control internal negative pressure source and external negative pressure source to generate negative pressure at the wound, wound drainage device The generated lactic acid metabolites are drained, the negative pressure detection unit detects the pressure at the wound, the flow and velocity detection unit detects the drainage volume and drainage speed at the wound, and the detected signal is fed back to the internal negative pressure control unit or external negative pressure control unit , the control unit controls the negative pressure source according to the feedback signal; when the wound causes massive bleeding, the alarm unit sends out an alarm signal. The present invention can use a negative pressure pump or a hospital negative pressure system as a negative pressure source, which can be flexibly selected in practical applications.

The invention discloses a gas-type road limit device. The gas-type road limit device comprises a main hollow rectangular shell, wherein a main air storage space is arranged in the center of the main hollow rectangular shell. A plurality of equidistant cylindrical hollow shells are arranged on the upper surface of the main hollow rectangular shell. The center of each cylindrical hollow shell is provided with a secondary air storage space. The gas-type road limit device uses air as a medium to provide a retractable limiting function, and has the characteristics of low cost in use and easy accessto raw materials. In addition, the gas-type road limit device has an air pressure control mechanism and can effectively control the maximum value of the internal air pressure, so as to effectively prevent a motor from burning out in the drive device which is used to provide air due to excessive gas pressure. In addition, the air pressure control mechanism can play a pre-warning role. When the internal air reaches a maximum value, the air pressure control mechanism can send a clear warning effect, thereby reducing the occurrence of power waste, and has high practicality.

A multiple cylinder engine controls an air/fuel ratio accurately by improved detection of the fluctuations in a vacuum due to a change in the openings of throttle valves. The multiple cylinder engine includes a plurality of intake passages that independently feed intake air to cylinders; fuel injectors; throttle valves; a pressure sensor; and a fuel controller that controls fuel injection of each cylinder using the detected pressure. The multiple cylinder engine may further include a vacuum inlet passage having an inlet port opened into intake passages that introduces the pressure of the intake passages into the pressure sensor. The vacuum inlet passage preferably includes a throttle portion having a passage area of no more than one ninth that of the inlet port.

The invention provides a BOG treatment system and method of LNG storage tanks applicable to different design pressures. The system is provided with the low pressure LNG storage tank and the high pressure LNG storage tank; the low pressure LNG storage tank and the high pressure LNG storage tank are converged into a BOG header pipe, are connected with a BOG buffering tank, and then are connected toa BOG compressor and a backflow air blower; a check valve is installed on a BOG pipeline of the low pressure LNG storage tank; an opening degree control valve is installed on a BOG pipeline of the high pressure LNG storage tank; the BOG header pipe is further connected with a branch circuit heading for a torque system; and a branch pressure control valve is installed on the branch circuit. By monitoring the pressure of each pipeline and controlling the BOG compressor, the system, heading for a torque, of a branch pipe, a safety valve of the low pressure LNG storage tank and a safety valve of the high pressure LNG storage tank to be opened, the equipment safety of the whole system is guaranteed.

A process for polymerizing or copolymerizing ethylenically unsaturated monomers in the presence of free-radical polymerization initiators, wherein the polymerization is carried out at temperatures from 100° C. to 350° C. and pressures in the range of from 110 MPa to 500 MPa in a continuously operated polymerization reactor which is controlled by a pressure control valve at the outlet of the polymerization reactor, the process comprising continuously monitoring the pressure within the polymerization reactor, feeding a pressure signal to a controller for controlling the control valve and having the controller altering the opening of the pressure control valve to control the pressure within the polymerization reactor, wherein the controller starts an emergency shutdown program when the pressure control valve closes more than a preset threshold value and the pressure within the polymerization reactor decreases below a preset pressure threshold.

The invention relates to the fire extinguishing agent concentration measuring technology, in particular to a calibrating device for a fire extinguishing agent concentration measuring system. The problem that an existing fire extinguishing agent concentration measuring system is low in calibration accuracy is solved. The calibration device comprises a standard gas pressure control tank and a standard gas equally-dividing device, wherein the inlet of the standard gas pressure control tank is communicated with a standard gas generating device through a flow control valve, the standard gas equally-dividing device is provided with a containing cavity, an inlet and measuring outlets, the inlet and the measuring outlets are communicated with the containing cavity, the outlet of the standard gas pressure control tank is communicated with the inlet of the containing cavity through the outlet valve, the measuring outlets of the containing cavity are evenly distributed, and each measuring outlet is communicated with the fire extinguishing agent concentration measuring system through a measuring channel. By means of the device, the consistency and synchronism of all channel calibration sources during calibration of the special fire extinguishing agent concentration measuring system can be ensured, and therefore the final calibration accuracy of each channel is ensured, calibration efficiency is improved, and calibration expenses are saved.

The invention provides a heat exchanger. The heat exchanger comprises a heat exchanger body as well as a temperature acquisition module, a master control chip module and a touch panel which are sequentially connected, wherein the temperature acquisition module is connected with the heat exchanger body, and a current control module is also connected between the heat exchanger body and the master control chip module; and a pressure control module is also connected between the heat exchanger body and the master control chip module and controls the pressure of a fluid in the heat exchanger to heat exchanger walls. According to the heat exchanger, parameter information of the heat exchanger is set and displayed by the touch panel, so that the operability and the man-machine interactivity of the heat exchanger are improved, and modern production requirements are met.

The invention discloses a negative pressure control device of a proximity type CV carton transparent paper packaging machine and the packaging machine. The device comprises a cam shaft, a first cam, asecond cam, a first proximity switch, a second proximity switch, a first relay, a second relay, a first electromagnetic valve, a second electromagnetic valve, a main gas source, a first negative pressure supply pipeline and a second negative pressure supply pipeline, wherein the two cams are correspondingly arranged at two ends of the cam shaft, the two cams are asymmetric, the first proximity switch, the first relay, the first electromagnetic valve and the first negative pressure supply pipeline are sequentially connected, and the second proximity switch, the second relay, the second electromagnetic valve and the second negative pressure supply pipeline are sequentially connected. According to the negative pressure control device of the proximity type CV carton transparent paper packaging machine and the packaging machine, a whole control loop is arranged outside a machine body and replaces an existing negative pressure control valve arranged inside the machine body, so that oil mistinside an original machine is effectively prevented from immersing into a negative pressure gas suction pipe, normal operation of upstream negative pressure supply equipment is guaranteed, and the quality problem caused by blockage of the negative pressure pipeline is solved.

The invention discloses a pure pump type pressure water supply device, which is characterized by comprising a water supply pump, a water tank, a pressure control valve and a water supply pipeline, wherein the water inlet end of the water supply pump is connected with the water outlet end of the water tank, the water outlet end of the water supply pump is connected with the water inlet end of the water supply pipeline through a check valve, a communicating pipeline is arranged between the water inlet end of the water supply pipeline and the water tank, and the pressure control valve is arrangedon the communicating pipeline between the water supply pipeline and the water tank. A frequency converter and a variable frequency motor in the variable frequency water supply device can be omitted,the device is driven by a common motor, so that the water supply pump continuously operates at a constant speed, the water supply amount and the water supply pressure are automatically adjusted according to the change of the water consumption, the water supply pump cannot generate a heating phenomenon due to low-displacement continuous operation under the action of the pressure control valve, thecost and the space are saved, the equipment weight can be reduced, and the real ship arrangement is facilitated.

The invention discloses a high-precision ink pressure control device for a three-dimensional additive printer. The high-precision ink pressure control device comprises an ink tank and a box body; an inner cavity of the box body is provided with a cylinder body; a cylinder sleeve is embedded in the cylinder body and is slidably connected with a piston; the piston is hinged with a shaft neck of a crankshaft by a connecting rod; the crankshaft is fixedly connected with a first rotating shaft which is horizontal; the first rotating shaft is provided with a second belt wheel; a chamber is formed atthe bottoms of the cylinder body and the box body; the side wall of the box body is provided with a first one-way valve communicated with the chamber; the side wall of the box body is provided with apressure regulating mechanism by a bracket; the pressure regulating mechanism comprises a barrel body; an inner cavity of the barrel body is provided with a bearing; an inner ring of the bearing is provided with a disk; the center of the disk is provided with a second rotating shaft; an a radial rectangular groove is formed in the disk. The ink pressure is balanced by changing the size of a gap between a slide block and the rectangular groove, so that the ink pressure can be effectively controlled to be stable, and the jet printing effect is guaranteed.

The invention discloses damage-free suction pliers based on a suction cup principle. The damage-free suction pliers comprise a flexible suction cup, a shell, an elastic membrane, an elastic support, atop-end one-way vent valve and an air pressure balance channel, wherein the flexible suction cup, the shell, the elastic membrane, the top-end one-way vent valve and the air pressure balance channelform an air pressure control cavity together. The damage-free suction pliers have the advantages that damage-free suction and release of tissue can be rapidly achieved, the suction pliers are particularly suitable for suction of the tissue which is provided with flat and smooth surfaces and is not likely to deform, defects of traditional clamping pliers are overcome, and the damage to the tissue is reduced.

The invention discloses a telescopic spraying device for an electroplated inner wall of a conveying cylinder, and relates to the technical field of electroplating cleaning equipment. The telescopic spraying device comprises a fixed pipe, a first telescopic pipe mechanism, a second telescopic pipe mechanism and a spraying mechanism, one end of the fixed pipe is connected with a liquid inlet guide pipe, and one side of the outer wall of the fixed pipe is connected with a liquid discharge guide pipe and an air guide pipe. The liquid discharge guide pipe is positioned at the end, close to the liquid inlet guide pipe, of the outer wall side surface of the fixed pipe. The device is provided with the fixed pipe, a first telescopic bin, a first limiting ring block, an air guide hole, the liquid inlet guide pipe, the liquid discharge guide pipe, the air guide pipe, an electromagnetic valve, a pneumatic valve, an air inlet pipeline, an exhaust pipeline, a first limiting sliding block, a first liquid inlet hole, a first pipe joint, a second telescopic bin, a second limiting ring block, a connecting hole, an air conveying groove hole, a second limiting sliding block, a second liquid inlet hole, a second pipe joint and a pressure control valve, so that the telescopic function of the spraying device is achieved.

The invention relates to the technical field of automobile air conditioners, and particularly relates to a manufacturing method of a blow molding and forming air channel. The method comprises the following steps: 1, preparing materials; 2, mixing plastic particles and a foaming agent; 3, feeding into a conveying mechanism; 4, heating to smelt; 5, foaming a mixture; and 6, forming through a mold. With the adoption of the method, the weight of spare parts can be reduced, so that the air channel is light in mass; and moreover, the noise produced by vibration of the air channel when an automobileruns is reduced, and thus the comfort of use is improved; the foaming time can be controlled; the pressure control range is accurate; the prefabricating time can be determined; the technology is controllable; and the method is low in production cost, high in efficiency, and easy to realize industrialization.

The invention relates to a method for preparing blue-shifting TiO2 microspheres. The method comprises the following steps: adding titanium sulfate in deionized water to obtain a solution A; adding urea in deionized water to obtain a solution B; slowly dripping the solution B in the solution A to obtain a solution C; mixing a dimethylformamide solution D and the solution C to obtain a solution E; transferring the solution E to a hydrothermal reaction kettle lined with Teflon, sealing the hydrothermal reaction kettle and then putting the sealed hydrothermal reaction kettle in a temperature-pressure-controlled microwave hydrothermal reaction instrument for preparation reaction in a temperature control mode, and carrying out natural cooling after the completion of reaction; and allowing the obtained white turbid liquid to stand, alternately washing the white turbid liquid with ethanol and deionized water, then carrying out centrifugal collection by taking absolute alcohol as the solvent, and drying to obtain the products, namely TiO2 microspheres. The microwave radiation heating method is adopted, the regular spherical blue-shifting TiO2 microspheres are further prepared in the high-temperature and high-pressure hydrothermal environment, and the blue-shifting TiO2 microspheres are 1-2 mum in diameter, 3.35 ev in forbidden bandwidth and better in dispersivity.