59results about How to "Accurate opening control" patented technology

The invention relates to cementing equipment and mixing equipment for oil and gas field and provides a clear water controlling device for a high-energy mixer and the high-energy mixer. The clear water controlling device comprises a soleplate, a linear actuator, a hinge shaft, a rocking arm, a leading screw, a manual rocking handle, a thread spindle and a valve rod, and is characterized in that the soleplate is hinged with a mounting base of the linear actuator; the hinge shaft is inserted in a central shaft hole of the soleplate; one end of the leading screw is fixed on the hinge shaft; the central portion of the leading screw forms a sleeve joint with the thread spindle, which is inserted in a central hole of the rocking arm; the upper end of the rocking arm is hinged with the valve rod; the lower end of the rocking arm is hinged with a push rod of the linear actuator; a through hole is arranged at the junction of the thread spindle and the leading screw; and a pin is disposed inside the trough hole. According to the invention, automatic and accurate control of the valve rod feed can be conveniently realized such that the slurry mixing effect of the high-energy mixer is more excellent than that in the prior art and the high-energy mixer can be used in both automatic and manual modes.

The invention discloses a control method of an electronic expansion valve of an automobile air conditioner system. The method includes acquiring a result of the judgment of whether the electronic expansion valve is currently in the fault state or not according to the acquired current openness, actual overheat degree Tsh and preset overheat threshold Tsh_set of the electronic expansion valve while conducting overheating degree control and outputting a control signal to an execution mechanism according to the result of the judgment. By means of the control method, effective fault diagnosis can be conducted on the electronic expansion valve in real time. When the overheat degree is mistakenly controlled, the control signal is output to the execution mechanism to stop work of the system by controlling a compressor to shut down and/or remind operators to conduct fault overhauling by controlling a fault indicator lamp to be turned on, so that accidents of refrigeration system device damage caused by mistaken control can be completely avoided, and system running safety and reliability can be improved.

The invention relates to a heat pump air conditioner with better heating effect in low-temperature, which comprises a compressor, a four-way valve, indoor and outdoor heat exchangers, and main throat device, which are connected via tubes. Wherein, said compressor has a outlet and two inlets; a bypass tube is arranged at the front and back of main throat device to connect the second inlet of compressor. The invention comprises a steam ejection controller, which at least includes three sensors and one electric expansion valve, while the sensors are at the outlet and two inlets of compressor, and the electric expansion valve is on the by-pass tube. The invention detects the ejector pressure of compressor to control the ejected amount of refrigeration accurately, improve the heating effect and energy/efficiency ratio in lower temperature. it can accurately control the open degree of electric expansion valve, to reduce the vibration of indoor temperature.

A pneumatic valve control mechanism is characterized by comprising a guide arm, a drive air cylinder and a magnetic reversing valve. An air inlet of the magnetic reversing valve is used for compressed air to be fed, and an air outlet is connected with an air inlet of the drive air cylinder. One end of the guide arm is connected with a valve element drive shaft of the valve, the guide arm can rotate around the valve element drive shaft of the valve and is provided with a chute, a slide shaft is installed in the chute, and the slide shaft is connected with a piston rod of the drive air cylinder to jointly form a connecting rod mechanism. The reciprocating motion of the piston rod drives the slide shaft to slide in the chute of the guide arm so as to form the connecting rod motion mechanism, the guide arm is driven to perform reciprocating rotation around the valve element drive shaft of the valve and further open or close the valve, and remote control of the valve is achieved through the magnetic reversing valve. On the basis, the position required to be reached, of the piston rod can be calculated according to the opening degree of the valve, then the position of a proximity switch sensing end on the drive air cylinder is adjusted, and accordingly accurate positioning during valve opening is achieved.

The invention discloses an electric EGR valve which comprises a shell, a driving motor, a valve rod and a valve block. The driving motor is arranged in the shell, and connected with an intermediate gear, the intermediate gear is meshed with a sector gear, the sector gear is integrally connected with a torsional spring seat, the torsional spring seat is connected with a return torsional spring, the other end of the return torsional spring is fixed to the shell, the sector gear is fixed to a driving shaft, the driving shaft is rotatably arranged in the shell through a rolling bearing and a sliding bearing, an induction magnet is arranged on the driving shaft, and electrically connected with a Hall sensor, a cam groove is formed in the sector gear, a cam bearing is arranged in the cam groove, the cam bearing is connected with a cam bearing shaft and a cam bearing support, the upper end of the valve rod is connected with the cam bearing support, and the lower end of the valve rod is connected with the valve block. The EGR valve is accurate in control, convenient to assemble and low in failure rate.

The invention provides a throttling valve. The throttling valve comprises a throttling valve shell and a valve plate erected inside the throttling valve shell, the throttling valve shell comprises a valve inlet, a valve outlet and a throttling area arranged between the valve inlet and the valve outlet, and the valve plate is erected on the throttling area; a throttling initial point which is in cooperation with the valve plate when the valve plate is closed and a throttling end point which is in cooperation with the valve plate when the valve plate is totally opened are arranged on the inner wall of the throttling valve shell, and a throttling hook face which is in arc transition to the throttling end point from the throttling initial point is further arranged on the inner wall of the throttling valve shell. The throttling hook face which is in arc transition to the throttling end point from the throttling initial point is arranged on the inner wall of the throttling valve shell, alongwith the rotation of the valve plate, the spacing between the end of the valve plate and the throttling hook face is in uniform transition, the opening range control is more accurate, the situation that throttling of the throttling valve is unstable due to sudden change of the throttling area of the valve plate is avoided, the throttling control precision is higher, and the controlling precisionof the throttling valve is improved. The invention further provides an engine provided with the throttling valve structure.

The invention discloses a control method and device for an electronic expansion valve, and electronic equipment. The control method for the electronic expansion valve comprises the following steps: acquiring the actual value of an exhaust pressure at the outlet of a compressor; subtracting the actual value of the exhaust pressure at the outlet of the compressor by the given value of the exhaust pressure at the outlet of the compressor to obtain an error signal; adjusting the error signal to obtain an adjustment signal; and controlling the opening degree of the electronic expansion valve to stabilize the opening degree of the electronic expansion valve in a set range according to the adjustment signal. According to the embodiment of the invention, the opening degree of the electronic expansion valve is adjusted to be stabilized in the set range according to the error signal between the given value of the exhaust pressure at the outlet of the compressor and the acquired actual value of the exhaust pressure at the outlet of the compressor, so that accurate control for the opening degree of the electronic expansion valve is realized.

The invention discloses a hydraulically powered gas injection valve which comprises a valve body and a valve element, wherein a valve bush is arranged in the valve body; an electromagnetic valve communicating with an inner cavity of the valve body is mounted at the external part of the valve body; a valve rod of the valve element and the valve bush are in sliding fit; the valve rod is provided with a first stretching part and a second stretching part stretching out of the valve bush; the first stretching part of the valve rod is fixedly connected with a magnet through a magnet seat; a magnetic field sensor is fixed in the valve body and corresponds to the magnet in position; and a sliding guiding device is arranged between the valve rod and the valve bush. The magnet is fixed with the valve element through the magnet seat and moves along with the valve element, and the magnetic field sensor detects variation of a magnetic field to sense the stroke of the valve element so as to accurately control opening of the valve element; and through the sliding guiding device, the valve element is enabled not to rotate during axial movement, so that detection error brought to the magnetic field sensor by magnetism difference of the magnet in the circumferential direction is eliminated, and measurement accuracy is improved.

The invention discloses an electromechanical ventilating valve capable of controlling gas pressure inside a closed cavity. The electromechanical ventilating valve comprises an electric actuator (3), a valve (1), a controller (4) and a differential pressure sensor (8), wherein the electric actuator (3) is provided with a rotating shaft; the rotating shaft of the electric actuator (3) is sleeved with the valve (1), and the valve (1) is used for connecting or disconnecting a fuel tank and the outside atmosphere; the controller (4) is used for controlling rotation of the rotating shaft of the electric actuator (3); the differential pressure sensor (8) is used for transmitting collected differential pressure values of the gas pressure of the fuel tank and the pressure of the outside atmosphere to the controller (4); and two end values, which are compared with the received differential pressure values of the gas pressure of the fuel tank and the pressure of the outside atmosphere, of the upper limit and the lower limit of an aircraft fuel tank gas pressure limit range are preset in the controller (4). The electromechanical ventilating valve can substitute for two original mechanical ventilating valves and can adjust any gas pressure ranges.

The invention discloses an air conditioning unit and an electronic expansion valve control method. The air conditioning unit comprises a refrigerant circulation loop, a compressor, a condenser, an electronic expansion valve, an evaporator and a controller. The electronic expansion valve control method is configured to obtain first operation parameters, second operation parameters, third operation parameters, evaporator pressure and compressor power in the operation of the air conditioning unit, wherein the first operation parameters are the air suction pressure and the air suction temperature of the compressor, the second operation parameters are the exhaust pressure and the exhaust temperature of the compressor, and the third operation parameters are the condenser pressure and the condenser liquid outlet temperature; and the target opening degree of the electronic expansion valve is determined based on the first operation parameters, the second operation parameters, the third operation parameters, the evaporator pressure and the compressor power; The opening degree of the electronic expansion valve is controlled through the target opening degree, so that the opening degree of the electronic expansion valve is accurately controlled, and lagging actions or frequent actions of the electronic expansion valve are reduced.

The invention discloses a supercharger execution control structure, which comprises a control unit and a supercharger waste gas vent valve, as well as an electric actuator, wherein the supercharger waste gas vent valve consists of a supercharger waste gas vent valve seat and a waste gas vent valve which are matched with each other, the control unit is connected with the electric actuator through a wiring harness, the waste gas vent valve is connected with the electric actuator through a pull bar. A supercharger execution control method comprises the following control steps: calculating the power of a gas compressor by the control unit according to the required supercharged pressure, and then converting into the power of a turbine according to the energy balance principle, thus being capable of acquiring required waste gas energy; calculating the openness of the waste gas vent valve according to the quantity of the required waste gas energy, and outputting a control command to the electric actuator through the control unit; and executing actions by the electric actuator to drive the pull bar to achieve the required openness value of the waste gas vent valve. The supercharging pressure control precision can be enhanced, and the response speed of the supercharger can be increased.

The embodiment of the invention provides an ammonia pump liquid supply refrigerating system and a control method thereof. The ammonia pump liquid supply refrigerating system involves a compressor, a condenser, a liquid storage device, an expansion valve, a low-pressure circulating barrel, an ammonia pump, an evaporator and a control system. The exhaust end of the compressor is connected with an inlet of the condenser, and an outlet of the condenser is connected with a liquid inlet of the liquid storage device; an outlet of the liquid storage device is connected with an inlet of the expansion valve, and an outlet of the expansion valve is connected with a liquid supply port of the low-pressure circulating barrel; a liquid outlet of the low-pressure circulating barrel is connected with an inlet of the ammonia pump, and an outlet of the ammonia pump is connected with an inlet of the evaporator; an outlet of the evaporator is connected with a flow return port of the low-pressure circulating barrel, and a gas return port of the low-pressure circulating barrel is connected with an air suction port of the compressor; and the control system is connected with the expansion valve and used for controlling an opening degree of the expansion valve so as to adjust a liquid level height in the liquid storage device. The refrigerating system can effectively reduce the probability of ammonia leakage accidents, and the safety and reliability of the refrigerating system are greatly improved.

The invention discloses a VOC automatic processing system used for spray painting operation and an optimized adjustment method of VOC processing. The system includes an inlet, a front concentration sensor, a regulating valve, a first switching valve, an adsorbent bed agent catalytic bed, a second switching valve, a back concentration sensor, an outlet and a control module; the VOC automatic processing system automatically measures and records concentration values of VOCs of waste gases in the spray painting operation area and the front end and rear end of a system pipeline in real time, processes and calculates measured VOC concentration value data, and controls opening and closing of the valves in the system to realize control of a waste-gas processing cycle; and when the concentration ofthe VOCs in the waste gases in the spray painting operation area or the VOC automatic processing system changes, the system automatically adjusts and controls the valves to ensure reliability of operation of the VOC automatic processing system. The VOC automatic processing system disclosed in the invention can accurately monitor and control the concentration of the VOCs of the waste gases in realtime, the stability of operation of the VOC processing system is improved, and real-time capability and accuracy of monitoring and rapidity, accuracy and stability of control are realized.

The invention provides a central range hood, a terminal part and an air valve control method of the range hood, and relates to the technical field of oil smoke removal equipment. The terminal part of the central range hood comprises a range hood, a power distribution valve, an air valve controller and an acceleration detection device; the acceleration detection device detects the self dangling acceleration and sends the self dangling acceleration to the air valve controller; and the air valve controller detects the working current of the range hood and determines the working state of the range hood based on the working current and the dangling acceleration so as to control the opening degree of the power distribution valve. Compared with a terminal part in the prior art, the terminal part has the advantages that the acceleration detection device is additionally arranged in a pipeline, the air valve controller can accurately judge the working state of the range hood by combining the dangling acceleration of the acceleration detection device and the working current of the range hood, then the opening degree of the power distribution valve can be accurately controlled, the technical problem of misjudgment of the on-off state of the range hood is effectively solved, and the kitchen smoke exhaust effect of a user is improved.

The invention discloses a system for preparing the solid-gas flow state dry ice based on the CO2 cascade refrigeration twice throttling. The system comprises a high-temperature-stage refrigeration loop, a low-temperature-stage refrigeration loop and a CO2 twice throttling structure; and according to a closed preparation loop disclosed by the invention, solid-gas flow state dry ice is prepared froma small amount of initial CO2 raw material gas, so that the cost is reduced, the production continuity is ensured, the fluidity of a prepared solid-gas flow state dry ice product is better than thatof a dry ice solid, the temperature uniformity of a cooled object is improved, and a cascade refrigeration and twice throttling system with accurate temperature control improves the stability of the solid-gas flow state dry ice product preparation. The system for preparing the solid-gas flow state dry ice based on the CO2 cascade refrigeration twice throttling has the advantages of stability, reliability, high refrigerating capacity, low operation cost, environmental friendliness and the like.

The invention discloses a multi-blade type round valve. The multi-blade type round valve comprises a shell, blade assemblies and a hand wheel assembly. The multi-blade type round valve further comprises rotation arms and connection arms. The shell comprises a connecting cylinder, a center connecting block, three fixing rods and a support. The center connecting block is arranged in the center of the connecting cylinder and fixedly connected with the connecting cylinder through the fixing rods. The support is fixedly connected with the connecting cylinder. First connecting holes are evenly formed in the connecting cylinder, and second connecting holes are evenly formed in the center connecting block. Each blade assembly comprises a sector blade, a first rotating shaft and a second rotating shaft. The multi-blade type round valve has the beneficial effects that the multiple sector blades are arranged, the opening resistance is small, the service life of the blades is long, and labor is saved during operation; and the opening degree of the valve can be better accurately controlled, and using is convenient.

The invention discloses a low-resistance valve capable of precisely controlling a flow rate, which belongs to the technical field of fluid conveying. A valve rod 3 is combined with a helical micrometer structure 4, and by utilizing the principle of a helical micrometer instrument, the openness of the valve can be precisely displayed and controlled; fluid of a valve body 1 flows along a C-shaped runner, the fluid is distributed in a linear way, and the runner is smoother; the upper part of a valve clack 2 is in a rectangular shape, and the lower part of the valve clack 2 is in an arc shape; and the valve clack 2 and the valve body 1 are sealed by a semispherical sealing groove 6. The low-resistance valve capable of precisely controlling the flow rate can overcome the defects of the prior art, not only can precisely control the flow rate, but also has the advantages of convenience in opening, precision in controlling, no leakage and small pressure reduction.