摘要:
A four channel gas delivery system. The system comprises an inlet channel; four outlet channels; four control valves, each valve being arranged so as to control the flow from the inlet channel through a corresponding one of the outlet channels; and a flow ratio control system. The flow ratio control system includes two dual antisymmetric optimal (DAO) control modules. The DAO control modules are configured and arranged so as to control the respective control valves so as to control the relative ratios of flow from the inlet channel through the four outlet channels. The flow ratio control system also includes a virtual DAO control module configured and arranged so as to control the ratio of flow between the two DAO control modules.
摘要:
The invention relates to a storage and metering device intended for the injection of an additive (E) into a pipe (15) through which a variable-flow-rate liquid flows. The device is characterised in that it includes: a container (53) intended to house the additive and provided with an additive outlet (56) to be connected to the pipe, optionally by means of an injection system (22); and a differential pressure regulator (54) including a gas inlet (70) to be connected to a gas source (71), a gas outlet (74) connected to a pressurisation inlet (75) of the container (53) so that the container can be pressurised to a pressurisation pressure (P G ) and a control inlet (78) to be connected to the pipe (15).
摘要:
The proportioning valve apparatus includes a cylindrical valve body (3) having a first inlet (11) for receipt of a first fluid, a second inlet (13) for receipt of a second fluid, a mixing chambre (27), and an outlet (15) for releasing a mixture of the two respective inputs. A rotary barrier element (21) is positioned adjacent to the first (11) and second (13) inlets and operates to selectively impede the flow of fluids through first and second inlets and into the valve chamber (27). Rotation of the rotary valve barrier (21) in a first direction is operative to close the first inlet (11) while simultaneously opening the second inlet (13). The present invention further includes a closed loop control system utilizing measurement of the density of the output mixture to control the activation of the proportioning valve.
摘要:
The vapor phase and the liquid phase of the two-phase fluid flow, for example wet steam, are separated. The vapor phase flows in a vapor line (13) having an orifice (12) with pressure taps (14,15) on either side. The liquid phase flows in a bypass line (25) having an orifice (26) with pressure taps (27,28) on either side. The mass flow rate of each phase is obtained from the upstream pressure and pressure drop measurements across the orifices. The phases are recombined in the plane of symmetry of the output line (11). The liquid flow rate through the bypass line is controlled by a valve (23) responsive to the mass flow rate measurements.
摘要:
A liquid supply module includes one or more sets of bulk liquid containers each supplying a respective reservoir via a liquid supply line. The bulk liquid containers and reservoirs are vented above the highest liquid level in the system. A pump periodically removes a known volume of liquid from a reservoir which is replenished from a bulk liquid container. A sensor detects a liquid/air transition in the liquid supply line to the reservoir indicative of the exhaustion of liquid resupply from the bulk liquid container. An air vent solenoid valve in communication with the reservoir is closed when an empty bulk liquid container is replaced. Normal pump operation siphons liquid out of the bulk container after container replacement. A control system tracks pump iterations and calculates a number of executable iterations remaining before the reservoir runs dry. With a fresh bulk container in place, the air vent solenoid opens the reservoir air vent upon detection of an air/liquid transition allowing liquid to flow by gravity from the bulk container into the reservoir. A bulk liquid container lid sensor indicates whether a bulk liquid container is properly installed in the system. The liquid module is disposable in a sliding drawer, and can include unique mechanical keying means to insure each bulk liquid container fits in only one position in the liquid supply module.
摘要:
The invention relates to an arrangement in connection with a gas mixer, which is arranged to form a mixed gas of oxygen and another gas to be mixed with it. To provide a simple and reliable arrangement, before the mixed gas is formed the oxygen is arranged to be supplied through both a mechanical adjusting means (4), and a mechanical and electronic flow-measuring means (5, 6). The other gas to be mixed with oxygen is arranged to flow through an electronic flow-measuring device (10). The flow of the other gas is arranged to be regulated by means of an electronically controlled regulating valve (9), whereupon the electronic flow-measuring means (6), the electronic flow-measuring device (10), and the electronically controlled regulating valve (9) are arranged to be operated by means of a control unit (13).
摘要:
The invention relates to an arrangement in connection with a gas mixer, which is arranged to form a mixed gas of oxygen and another gas to be mixed with it. To provide a simple and reliable arrangement, before the mixed gas is formed the oxygen is arranged to be supplied through both a mechanical adjusting means (4), and a mechanical and electronic flow-measuring means (5, 6). The other gas to be mixed with oxygen is arranged to flow through an electronic flow-measuring device (10). The flow of the other gas is arranged to be regulated by means of an electronically controlled regulating valve (9), whereupon the electronic flow-measuring means (6), the electronic flow-measuring device (10), and the electronically controlled regulating valve (9) are arranged to be operated by means of a control unit (13).
摘要:
In a hot-water and cold-water mixing device of the type wherein a hot-water side valve element (27) and a cold-water side valve element (28) are provided for regulating the flow rate of hot and cold water, the valve elements (27, 28) are so constructed as to possess a temperature regulating function attained by varying the hot water-to-cold water mixing ratio depending on a biasing force, and also an automatic pressure regulating function to automatically accommodate a sudden pressure change. The water mixing device of the foregoing construction is compact in size and capable of adjusting the final water temperature reliably and speedily.
摘要:
A control system for internal combustion engines, including a first conduit for the flow of intake air, and a second conduit for the flow of natural gas to be mixed with the air for combustion. The flow of the air is variable over a range of mass flow rates during operation of the engine and an air mass sensor is positioned to sense the mass flow rate in the first conduit and generate a first flow rate signal indicating the mass flow rate. A natural gas mass sensor is positioned to sense the mass flow rate of the gas in the second conduit and to generate a second flow rate signal indicating the mass flow rate of the natural gas. The first and second flow rate signals are compared in an electronic controller that generates a control signal if the first and second flow rates vary from a predetermined ratio. The ratio is selected to provide a substantially stoichiometric ratio of air and natural gas. A valve is provided to adjustably control the flow rate of the natural gas in response to the control signal to maintain the preselected ratio. A sensor and shutoff valve are also provided for terminating the flow of the natural gas when its pressure falls below a predetermined pressure, allowing immediate flow of gasoline to the engine, thus assuring smooth, continued operation of the vehicle. A throttle body has a natural gas distribution ring in the throat of the body and provides a curtain flow of gas.
摘要:
A transportable apparatus for controlling the production of a mixture of a fluid (supplied at 32) and a plurality of additives (from tanks e. g. 44, 46) utilizes a unified control panel (on an operator's platform 54) having all of the necessary controls compactly contained in a single housing (56) for providing both automatic and manual control of each of the additive channels through which the additives are mixed with the primary fluid, for flow into a holding tank (16). The control of each additive channel is achieved through a software controlled algorithm by which errors are only incrementally, rather than totally, applied to prior drive signals at any one time.