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Fluid flow control systemFluid flow control system description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070183903, Fluid flow control system. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001]This invention relates to fluid flow control systems. This invention also relates to methods of controlling fluid flow. More particularly, but not exclusively, the invention relates to fuel flow control systems, and methods for controlling fuel flow, for example for the flow of fuel in a gas turbine engine. [0002]Conventional fuel metering systems on gas turbine engines generally control the flow of fuel and require complex hydromechanical, electrical, electronic and software control loops to be implemented. These have cost, weight and reliability penalties. [0003]According to one aspect of this invention, there is provided a fluid flow control system comprising a pumping assembly for pumping a fluid through an orifice, a pressure measuring assembly for measuring, and providing information on, the change in pressure across the orifice, and a controller for processing the aforesaid information to adjust the pump assembly in accordance with the aforesaid information and vary the rate of flow of the pumped fluid. [0004]Preferably, the pumping assembly comprises a torque driven pumping assembly. The controller may be arranged to adjust the drive torque of the pump assembly in accordance with the aforesaid information on the change in pressure. [0005]The pumping assembly may comprise a torque driven pump and a prime mover to create the torque for driving the pump. The prime mover may be a motor. The motor may be an electric motor. The prime mover may have a rotatable component to provide the aforesaid torque to the pump. [0006]The fluid flow control system may comprise a main compensator to modify the aforesaid information to a form usable by the pumping assembly. [0007]Preferably, the controller provides a control signal to the pumping assembly to effect the aforesaid adjustment of the pumping assembly. In the embodiment where the prime mover is an electric motor, the signal may be an electric signal. [0008]The pressure measuring assembly may be arranged to provide a pressure difference feedback signal to the controller to provide the aforesaid information on the change in pressure across the orifice. [0009]In a preferred embodiment, the controller converts the pressure difference feedback signal to the control signal. [0010]The fluid flow control system may comprise a demand means for providing a demand for the fluid. Preferably, the demand means provides a demand signal relating to the rate of flow of fluid provided from the pumping assembly. [0011]The controller may include a main comparator for comparing the demand signal with the pressure difference feedback signal to provide a control signal to control the prime mover driving the pump. [0012]The fluid flow control system may further include a pump outlet pressure control arrangement comprising a pressure sensor to sense outlet pressure from the pumping assembly, and provide information on the aforesaid outlet pressure. In one embodiment, the information relating to the aforesaid outlet pressure may be provided to the controller for adjustment of the pumping assembly. The said adjustment may relate to the aforesaid outlet pressure. [0013]The pump outlet pressure control arrangement may comprise a pressure compensator to modify the information relating to the aforesaid outlet pressure to a form usable by the pump assembly. [0014]The pump outlet pressure control arrangement may provide an outlet pressure feedback signal to the controller, wherein the outlet pressure feedback signal provides the information on the outlet pressure of the pumping assembly. [0015]The fluid flow control system may further comprise a combustion pressure control arrangement comprising a combustor pressure sensor to sense the pressure in a combustor of an engine, such as a gas turbine engine and provide information on the pressure in the combustor. [0016]The information on the pressure in the combustor may be provided to the controller for adjustment of the pumping assembly. The said adjustment may relate to the aforesaid pressure in the combustor. [0017]The combustor pressure control arrangement may provide a combustor pressure feedback signal to the controller, wherein the combustor pressure feedback signal provides the information on the combustor pressure. [0018]The combustor pressure control arrangement may comprise a combustor pressure compensator to modify the information on the combustor pressure to a form usable by the pumping assembly. [0019]The fluid flow control system may further comprise a pumping assembly speed control arrangement comprising a speed sensor to sense the speed of the pumping assembly and provide information on the aforesaid speed. [0020]The information on the speed of the pumping assembly may be provided to the controller for adjustment of the pumping assembly, the said adjustment may relate to the aforesaid speed of the pumping assembly. [0021]The pumping assembly speed control arrangement may provide a pumping assembly speed feedback signal to the controller, wherein the pumping assembly speed feedback signal provides the information on the speed of the pumping assembly. The pumping assembly speed control arrangement may comprise a speed compensator to modify the information on the speed of the pumping assembly to a form usable by the pumping assembly to a form usable by the pumping assembly. [0022]The fluid flow control system may comprise at least one subsidiary comparator for comparing a primary control signal with one or more of the outlet pressure feedback signals, the combustor pressure feedback signal, and the speed feedback signal, and provide a subsidiary control signal for controlling the pumping signal. [0023]According to another aspect of this invention, there is provided a method of controlling fluid flow, the said method comprising pumping a fluid to an orifice, measuring the pressure drop of the fluid across the orifice, providing information on the change in pressure across the orifice, processing the aforesaid information and adjusting the pumping assembly in accordance with the processed information to vary the rate of flow of the pump fluid. [0024]In the preferred embodiment, the pumping assembly is a torque driven pumping assembly, and the method may comprise adjusting the torque of the torque driven pumping assembly in accordance with the processed information. Continue reading about Fluid flow control system... Full patent description for Fluid flow control system Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Fluid flow control system patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Fluid flow control system or other areas of interest. ### Previous Patent Application: Fan mounting system Next Patent Application: Submersible pumping system Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Fluid flow control system patent info. IP-related news and info Results in 0.13159 seconds Other interesting Feshpatents.com categories: Novartis , Pfizer , Philips , Polaroid , Procter & Gamble , 174 |
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