67results about How to "High accuracy of flow control" patented technology

A pressure regulator is associated with a solenoid-operated valve that is operated by a pulse waveform at a fundamental frequency substantially greater than the frequency response of the valve mechanism. This substantially attenuates solenoid pulsations and applies a predetermined pressure differential across the valve mechanism to accomplish improved flow control accuracy. The invention is especially advantageous for purging fuel vapor to an intake manifold of an internal combustion engine of an automotive vehicle.

The invention relates to a high-speed switch valve, in particular to a high-speed electrohydraulic switch valve driven by an giant magnetostrictive actuator, which solves the problems of the prior actuator in the switch valve that the temperature rise of a magnetostrictive rod is restrained, the structure is complicated, the design is not reasonable, the dynamic response speed is slow, the control precision is low and the drive efficiency is low. A coil frame (2) is sleeved on the magnetostrictive rod, a drive coil is wound on the coil frame (2), a liquid flowing inlet (24) is disposed on a side wall of an actuator casing, a liquid flowing outlet (23) is positioned on the side wall of a valve core (9), the liquid flowing inlet (24) is communicated with the liquid flowing outlet (23) through an axial hole (4-1) of the magnetostrictive rod (4) and the actuator casing (1) is sealed with a valve body (8). The high-speed switch valve has the advantages that the temperature rise of the magnetostrictive rod can be restrained, the structure is simple, the design is reasonable, the dynamic response speed is fast, the flow rate control precision is high and the switch frequency is high.

The invention provides a dual-flow meter type digital spraying system for a robot. The dual-flow-meter type digital spraying system partially consists of a fluid part, an air path part and a control part. The fluid part uses a circular feeding mode. Digital flow meters are respectively connected in series with a feeding pipeline and a feeding-back pipeline, so that a feeding flow and a feeding-back flow can be detected in real time. A pneumatic proportional valve is further connected in series with the feeding pipeline, so as to realize long-distance flow adjustment. The air path part is divided into six paths for supplying compressed air to each pneumatic element; electric proportional valves are connected in series with the air paths to realize long-distance adjustment; the control part consists of an upper computer and a PLC (Programmable Logic Controller) and is respectively connected with the electric proportional valves and the flow meters. The dual-flow meter type digital spraying system provided by the invention can be used for real-time flow detection and closed-loop control of a spray gun in a circular feeding mode, and is further provided with a coating pump, a stirrer, a spray gun switch and long-distance adjustment capacities of atomized air and fan width air. Particularly, the dual-flow meter type digital spraying system is applicable to the field of feeding at an in-gun circulating modem and is inconvenient to manual detection flow or a flow decay phenomenon is easy to occur.

A single flowmeter type digital spraying system for a robot is composed of a feed pipeline, a feed back pipeline, an air pipeline and a control part, wherein the feed pipeline conveys a coating to the feed inlet of an automatic spray gun, and a digital flowmeter and a pneumatic proportional valve are connected in series in the pipeline; the feed back pipeline conveys the coating to a coating container from the discharge hole of the automatic spray gun, thereby realizing circulating feed; the air pipeline provides compressed air for various pneumatic elements and an electrical proportional valve is connected in series to the pipeline; and the control part is composed of an upper computer and a PLC (Programmable Logic Controller) controller, which are connected to the electrical proportional valve and the flowmeter, respectively. The system is capable of realizing real-time flow detection and closed-loop control of the automatic spray gun in a circulating feed mode, and also capable of remotely adjusting a coating pump, a stirrer and an automatic spray gun switch as well as atomizing air and fan width air; therefore, the system is especially suitable for the situations in which an inside-gun circulating mode is used for feeding, but the flow cannot be manually detected conveniently or flow decay is easy to occur.

The inventive control spool means includes a flow control valve cylinder, in which are mounted one by one a flow control spool and a linear helical spring mounted. The flow control spool is hollow and it slides along the inner wall of the flow control valve cylinder. The method of manufacturing the control spool means includes the following steps of choosing the linear helical spring and setting the side-stream channel.

The present invention relates to an assembled valve. When the lifting amount of a second valve core for low flow control is below a specified amount, a previous guiding valve core arranged on the inner wall of a bush retaining body slidably and freely closes a previous conducting access, a first valve core for a large flow control closes a first valve port, so that a low flow control state for controlling the flow according to the lifting amount of the second valve core is formed. When the lifting amount of the second valve core excesses the specified amount, the previous guiding valve core rises along with the rise of a valve rod, the previous guiding access is opened, and the first valve core opens the first valve port, so that the large flow control state is formed. The previous guiding valve core is inserted in the valve rod slidably, freely and externally, and is applied a downward force by a spring part to close the previous guiding access, and when the lifting amount of the second valve core is increased further from the specified value, a hook is lift on the valve rod. The assembled valve enables the flow control accuracy of the low flow region to be improved, the controllable flow to be increased, and the tightness of the previous guiding access generated by the previous guiding valve core to be improved, so that bad actions are prevented reliably, and the reliability is improved.

The invention provides an expansion valve, belongs to the technical field of valves and solves the problem of low control accuracy of the existing expansion valve. The expansion valve comprises a valve element I and a cylindrical valve element II, wherein the valve element I is provided with a run-through throttling hole; a cylinder insertion head which can be inserted into the throttling hole isarranged on the end surface of the valve element II; the outer diameter of the insertion head is smaller than that of the valve element II; at least two straight cylinder surfaces with different diameters are arranged on the inner wall of the throttling hole from the hole opening to the inside; at least two ring-shaped throttling walls with different diameters are arranged on the outer wall of theinsertion head; when the insertion head is inserted into the throttling hole, the throttling walls are opposite to the straight cylinder surfaces and form throttling channels. The expansion valve ishigher in flow control accuracy.

The invention discloses a heat performance test system, which can perform test experiment and performance estimation on the heat storage/release performance of a heat storage device with high power and a wide temperature range and the heat exchange performance of a large-sized heat exchanger. The system consists of a test and control system, a heat energy production and storage system, a pressurestabilizing system, a tested device assembly, a pump valve assembly and the like, and can implement a test under a relatively wide temperature and pressure range. The system can also simulate outputting of unstable heat energy such as regenerable energy and implement a performance test and an operation strategy research on a large-scale medium and high-temperature heat storage device array, and can meet work such as a research and development test on key components of a compressed air energy storage system.

The invention discloses a urea solution metering injector which comprises a pump, a urea cylinder, a step motor and a nozzle. An outlet of the urea cylinder is connected to an entry end of the pump sequentially through a pre-filter, a first volume-variable member and a first one-way valve, a discharge end of the pump is connected to the nozzle sequentially through a second one-way valve, a second volume-variable member and a filter, and the step motor is connected to the pump. A pressure valve is disposed between the filter and the nozzle. A sensor is disposed between the nozzle and the filter. The step motor is connected with a control unit which is connected with the sensor and the nozzle. The control unit is used for controlling pressure and starting time of urea solution from the nozzle according to the speed of the step motor. Each of the pre-filter, the filter, the first one-way valve, the second one-way valve, the pump and the step motor is provided with a heating unit.

The invention discloses a hydraulic speed regulating valve and a hydraulic system, and belongs to the field of hydraulic valve assemblies. The hydraulic speed regulating valve comprises a pressure reducing valve, a throttling valve, an overflow valve and a Venturi tube; an oil outlet of the pressure reducing valve communicates with an oil inlet of the throttling valve; an oil drainage port of thepressure reducing valve communicates with an oil outlet of the throttling valve; an oil inlet of the overflow valve communicates with the oil outlet of the throttling valve; the oil outlet of the throttling valve communicates with an oil inlet of the Venturi tube; a control oil port of the overflow valve communicates with the throat of the Venturi tube; and opening pressure of the overflow valve meets a formula as shown in the specification. The hydraulic speed regulating valve is little in pressure loss, and the hydraulic oil flow accurately adjusted by the hydraulic speed regulating valve isthe same as the rated flow of a portable pump driving motor.

The invention discloses an electronic expansion valve, belongs to the field of electromagnetic valves, and solves the problem that a traditional electronic expansion valve cannot obtain the flow curve in application of one special system. The electronic expansion valve comprises a valve body, a valve needle module, and a driving device for driving the valve needle module to move; and the electronic expansion valve controls the driving device according to received pulse signals. The electronic expansion valve further comprises a valve base element mounted on the valve needle module; a small valve port is formed in the valve base element; a large valve port is formed in the valve body; the driving device drives the valve needle module to move to control the openness of the small valve port; and the driving device drives the valve base element to move through the valve needle module so as to control the openness of the large valve port. The electronic expansion valve effectively realizes special flow curve control so as to realize application of the special system.

A composite valve has a communication path, a second valve port and a pilot passage. First and second valve bodies are arranged to be moved up and down in the same direction, and are away from each other only at a predetermined distance. In the case that a lift amount of the second valve body for a small flow rate control is equal to or less than a predetermined amount, said pilot passage and a first valve port are respectively closed by a pilot valve body and the first valve body, thereby taking a small flow rate control state. In the case that the lift amount of said second valve body goes beyond said predetermined amount, said pilot valve body is moved up by the upward movement of a valve shaft to open said pilot passage, thereby taking a large flow rate control state.

The invention provides a differential pressure compensation valve with a fast and stable main valve opening degree. The differential pressure compensation valve with the fast and stable main valve opening degree is used for realizing the compensation of various disturbance factors in the control of a large flow multi-way valve by the differential pressure compensation valve, with the help of the structural design of a valve element of a main valve, the pressure before and after the main valve is fast and stable, pressure fluctuation is reduced, and noise is reduced. The differential pressure compensation main valve and a differential pressure compensation pilot valve are included. The differential pressure compensation main valve comprises a main valve body and the valve element of the main valve. An oil inlet and an oil outlet are formed in the main valve body, the oil inlet communicates with an internal main valve cavity through a valve port, the valve element of the main valve is arranged in the main valve cavity, and the differential pressure compensation pilot valve comprises a pilot valve body and a valve element of the pilot valve. A pilot valve cavity is formed in the pilotvalve body, and the valve element of the pilot valve is arranged in the pilot valve cavity.

The invention provides a device for balanced discharge of parallel storage tanks. The device comprises a volumetric flow meter A (2), a volumetric flow meter B (4) and a rigid interconnection mechanism (3), whereina main shaft of the volumetric flow meter A (2) is connected with a main shaft of the volumetric flow meter B (4) through the rigid interconnection mechanism (3). The device for balanceddischarge of parallel storage tanks has the advantages of being high in flow control precision, wide in pressure application range and high in viscosity adaptability, flow calibration can be completed in a single-machine state, system pipeline matching and system cold flow testing do not need to be conducted, system testing and structural layout are simplified, and product reliability is greatlyimproved.

The invention provides a constant-volume metering pump. The constant-volume metering pump comprises a pump body, a solenoid device and a plunger pump, wherein the solenoid device and the plunger pump are located in the pump body. The solenoid device comprises an armature. The plunger pump comprises a sleeve, a plunger, an input valve and an output valve. The sleeve comprises a sleeve inner hole, and the sleeve inner hole is in close fit with the outer surface of the plunger and can slide freely. The interior of the pump body is divided into a low pressure space and a pressure feed space by the plunger pump. Liquid enters the pressure feed space from the low pressure space through the input valve, and then is discharged through the output valve. The constant-volume metering pump is characterized in that the sleeve and the armature are connected and kept reciprocating synchronously, the solenoid driving device drives the sleeve and the plunger to move relatively to enable the liquid to be discharged, and the liquid discharging amount obtained through relative movement between the sleeve and the plunger is limited by the geometric structure.

The invention relates to a working unit, a valve port independent control type multi-way valve and engineering machinery, the working unit can realize independent control of an oil inlet and an oil outlet, and manual, electro-hydraulic proportional and CAN (Controller Area Network) bus control modes can be adopted. The problem of mechanical fixed connection of an oil inlet and an oil outlet of a traditional multi-way valve is solved, and the control freedom degree is increased; the problems that an existing valve with an independent valve port is complex in control and unstable in control are solved, the structure is simple, the flow control precision is high, the cost is low, and switching between the valve with the independent valve port and a traditional upstream compensation load sensitive multi-way valve can be achieved. With the development of the sensor technology and the control technology, control methods of flow calculation control, pressure calculation control and the like can be achieved on the premise that the structure of the valve body is not changed, the second main valve element is replaced with the plug, the form of a throttling opening in the first main valve element is changed, and therefore the valve body structure is simplified. The function of the upstream compensation load-sensitive multi-way valve of a traditional structure can be achieved through the working unit, and therefore the performance of the multi-way valve with the independently-controlled valve port and even the performance of engineering machinery are improved.

The invention discloses a flow adjusting device which comprises a body, the body is provided with a water inlet channel and a water outlet channel, a water inlet hole is formed in the portion, between the water inlet channel and the water outlet channel, of the body, a moving shaft used for adjusting flow is arranged in the body, and the moving shaft can be connected with the water inlet hole in a matched mode. According to the kitchen and bath water treatment device, the structure is simple and stable, the flow control precision is high, and the kitchen and bath water treatment device is suitable for kitchen and bath water treatment products.