Abstract:
A pitot tube assembly for a centrifugal pump includes an extension arm having a tubular body with opposing ends, at least one pickup tube secured to one of the opposing ends of the extension arm, a terminal portion positioned at the other end of the extension arm and a tapered fitting provided toward the end of the extension arm opposite to the end of the extension arm to which the pickup tube is secured, where the tapered fitting provides a frustum surface for registration with a frustoconically-shaped bore of a portion of the pump to provide axial, radial and torsional stability to the pitot tube assembly during pump operation.
Abstract:
The invention presents a differential pressure type emission flow rate measuring method and apparatus and an emission measuring system using the same apparatus, capable of correcting measuring error occurring due to pulsation appropriately and enhancing the measuring precision of flow rate when measuring the flow rate of emission having pulsation. The invention, in measuring the flow rate of an emission exhausted from an engine, determines an accurate flow rate in spite of pulsation by using a differential pressure type flowmeter as the flowmeter, resolving the detected differential pressure signal by frequency, and correcting by using a correction coefficient predetermined depending on each frequency obtained by frequency resolution.
Abstract:
There is provided a differential pressure type flowmeter 20 that includes an orifice provided in a main flow channel 13, a first pressure sensor 7 configured to detect pressure of fluid on an upstream side of the orifice, a second pressure sensor 8 configured to detect pressure of fluid on a downstream side of the orifice, a first pressure introduction flow channel 14 configured to guide the fluid on the upstream side of the orifice to the first pressure sensor 7, and a second pressure introduction flow channel 15 configured to guide the fluid on the downstream side of the orifice to the second pressure sensor 8, wherein a flow channel length L and a flow channel diameter D3 of the first pressure introduction flow channel 14 coincide with those of the second pressure introduction flow channel, respectively, and a ratio of the flow channel length L to the flow channel diameter D3 is not less than 20 times and not more than 30 times.
Abstract:
The present invention relates to an analysing arrangement (100) for analysing a composition of a fluid, such as oil mist, of an engine, e.g. a gas turbine. The analysing arrangement (100) comprises a breather pipe (130) which is coupleable to the gas turbine such that at least a part of the fluid is flowing through the breather pipe (130), a first collecting device (110) for collecting a first sample of the fluid, wherein the first collecting device (110) is configured for providing a first composition analysis of the first sample and a second collecting device (120) for collecting a second sample of the fluid, wherein the second collecting device (120) is configured for providing a second composition analysis of the second sample. The first collecting device (110) and the second collecting device (120) are arranged inside the breather pipe (130) such that the first collecting device (110) and the second collecting device (120) are exposed to a common flow characteristic of the fluid inside the breather pipe (130).
Abstract:
The present invention relates to a flow metering device (10) for pulmonary function tests. Said device (10) comprises a sensing element extending in a longitudinal direction and defining an inner volume and an adapter unit (12), wherein said sensing element is a measuring tube (14) with open ends, and wherein a pressure difference inducing means is arranged in the measuring tube (14) between the open ends, said pressure difference inducing means comprises surfaces perpendicular to the longitudinal direction of the measuring tube (14), is in contact with the measuring tube (14) and partially occupies the measuring tube (14) in the inner cross section thereof, said pressure difference inducing means is formed by spoke arms in pairs joined in a single point, the spoke arms in a pair close a given angle with one another, and pressure offtake grooves (17, 27) are formed in the surfaces perpendicular to the longitudinal direction of the measuring tube (14) of said spoke arms. The essence of the device (10) according to the invention is that the pressure offtake grooves (17, 27) start at the point of join of the spoke arms and at least some of the grooves open into respective through holes formed in the measuring tube (14), the measuring tube (14) is provided on the outer side thereof with pressure signal offtake stubs (18, 28), each stub has an internal channel, wherein each of the channels of said pressure signal offtake stubs (18, 28) is in communication with the inner volume of the measuring tube (14) via one of said through holes, and the adapter unit (12) is provided with reception bores capable of receiving the pressure signal offtake stubs (18, 28) in a detachable and pressure tight manner, the reception bores are in communication with pressure signal offtake stubs (13, 23) of the adapter unit (12) and each reception bore forms a continuous flow path with the respective channel of the pressure signal offtake stub (18, 28) received thereby when the measuring tube (10) becomes connected with the adapter unit (12), and pneumatic low-pass filters formed as an integral part of the adapter unit (12) are incorporated in between said reception bores and said pressure signal offtake stubs of the adapter unit (12) so as to ensure filtering out fluctuations of the pressure signals led away from the inner volume of said measuring tube (14) separately by means of the pressure offtake grooves (17, 27) located in opposite surfaces of said spoke arms.
Abstract:
Disclosed is a flowrate sensor having a flowrate detection means built into a surface mounted package. The flowrate sensor includes a fluid flow path (70) formed in a package (12) to guide a fluid from an inflow port (30) provided in the lower surface of the package (12) to an outflow port (32) provided in the lower surface of the package (12) through the flowrate detection means; and an external terminal (40) provided in the outer surface of the package (12) to guide an electric output of the flowrate detection means therethrough. The flowrate sensor can be used for any of a liquid and a gas. The flowrate sensor is suitable for miniaturization, can be surface-mounted on an electronic circuit board or the like, and has a high reliability.
Abstract:
A valve assembly (10) includes a pitot tube (40) having an angled tip (41) to extract from a duct (21) formed by a housing (20) a sample of a fluid to be communicated to an actuator (30) configured to operate the duct (21). The pitot tube (40) is disposed within the housing (20) and is fixed longitudinally between the actuator (30) and the housing (20) and laterally within the housing (20). An anti-rotation mechanism (50) is coupled with the pitot tube (40) to rotationally secure the pitot tube (40) such that the angled tip (41) is fixed to face rearwardly.