Showing papers on "Impeller published in 1982"

Transient characteristics of a centrifugal pump during stopping period

Abstract: A theoretical and experimental study has been made on the transient characteristics of a centrifugal pump during its rapid acceleration from standstill to final speed Instantaneous rotatinal speed, flow-rate, and total pressure rise are measured for various start-up schemes Theoretical calculations for the prediction of transient characteristics are developed and compared with the corresponding experimental results As the results of this study, it becomes clear that the impulsive pressure and the lag in circulation formation around impeller vanes play predominant roles for the difference between dynamic and quasi-steady characteristics of turbopump during its starting period

Fan unit for an internal combustion engine of automobile vehicle

Abstract: A fan unit for cooling an internal combustion engine comprising a fan impeller associated with a coaxial channel for guiding the air travelling through said impeller and an electric driving motor of DC type. The channel is fixed to the ends of the blades of the impeller and rotates with the impeller and itself constitutes the rotor of the electric motor whose stator coaxially surrounds at least a part of the channel. The stator is rigid with a fixed shaft around which the impeller rotates. This fan unit has a high permeability when inoperative so that it is particularly adapted for use in an automobile vehicle.

Apparatus for mixing solids and fluids

Abstract: Disclosed herein is an apparatus useful for blending solids with fluids. In a specific application of the blender (13), sand is mixed with a gel composition to obtain a fluid mixture suitable for stimulation treatments of oil and gas wells. Basic components of this blender are a slinger member (16) and an impeller member (17), which are enclosed within a casing (11). The slinger and impeller are fastened together, with the impeller being positioned underneath the slinger. In addition, the slinger has a toroidal configuration and the impeller has a vortex configuration, and the slinger has a larger surface area than the impeller. The toroidal shape of the slinger, and its larger size, contribute to a good pressure balance within the fluid composition as it circulates inside the casing during the mixing operation. A more thorough mixing of the sand and gel composition is achieved by improving the pressure balance in the manner described.

Fluid-friction clutch

Abstract: A fluid-friction clutch for a cooling fan of an internal combustion engine, the clutch being fitted on the water-pump shaft which drives the impeller of a water pump for the internal combustion engine and being controlled by an expansion-type thermostat element which is located in a longitudinal bore through the water-pump shaft. Cooling water of the internal combustion engine is applied directly to the expansion-type thermostat element, this water being continuously conveyed through the longitudinal bore in the water-pump shaft by utilizing the pressure-difference created in the cooling water by the impeller of the water pump. In order to cool both the working chamber of the fluid-friction clutch and the clutch-bearing, a cooling line is arranged inside the working chamber and connected to the cooling-water circulation inside the longitudinal bore through the water-pump shaft.

Multi stage centrifugal impeller

Abstract: A multistage centrifugal impeller in which each blade row is individually matched to optimum efficiency characteristics in a manner which minimizes blade lean. Each blade row is composed of twisted blades which substantially equalize working fluid diffusion from blade root to blade tip while restraining blade lean to less than 15°.

Axial flow fan

Abstract: An axial flow fan has a plurality of impeller blades spaced around a hub assembly. The leading edge of each blade overlaps completely the trailing edge of the preceding blade, and the angular spacing between the radial center lines of the blades is unequal, preferably varying in a sinusoidal pattern, so that tonal noise of the fan is effectively attenuated.

Gear drive cooling

Abstract: A gear drive unit has a shaft mounted impeller which a series of blades or vanes inside the housing for the drive. The impeller vanes are positioned to be in the path of travel of oil flung off of a bull gear which rotates in an oil pan extending into an oil bath contained in the housing. The impeller is rotated by the impact of the oil against its vanes. In one embodiment, the rotating impeller drives a fan located outside the housing and the fan circulates air through a series of hollow tubes extending through the housing parallel to the impeller shaft. In another embodiment, the rotating impeller drives fans disposed outside of the housing at both ends of the impeller shaft.

Impeller adjuster for centrifugal pump

Abstract: A centrifugal pump having an adjustable feature enabling precise adjustment of the impeller's location.

Centrifugal pump for handling of liquid chlorine

Abstract: A machine for pumping liquid chlorine employs an upright shaft sump pump which is confined in a hermetically sealed housing and has a tubular supporting element surrounding the pump shaft. The latter is mounted in overhung position and is adjacent to a pressure pipe which conveys the pressurized liquid. The shaft seal is kept out of contact with the liquid by the housing as well as by a body of inert gas which is supplied to the interior of the housing and to the space between the shaft and the tubular element at a pressure depending on the pressure of inflowing liquid chlorine and being sufficiently high to prevent the inflow of liquid chlorine into the housing and/or tubular element when the pump is idle. The main impeller on the pump shaft is made integral with an auxiliary impeller which constitutes a hydrodynamic shaft seal and prevents the flow of conveyed liquid chlorine into the tubular element from below.

Motor driven fuel pump

Abstract: A motor driven fuel pump adapted for use with a fuel injection system of an internal combustion engine has a pump housing and an impeller of regenerative pump type rotatably disposed in the housing and provided with circumferential rows of grooves formed in the opposite end faces of the impeller along the outer peripheral edges thereof. The housing is formed therein with suction and discharge ports and cooperates with the impeller to define a fuel pressurizing passage extending circumferentially of the impeller and surrounding the grooved outer peripheral section thereof. The fuel pressurizing passage is circumferentially interrupted by a partition wall disposed between the suction and discharge ports and extending radially inwardly into close contacting relationship to the outer peripheral section of the impeller to prevent flow of fuel from the discharge port toward the suction port. The discharge port is tangential to the fuel pressurizing passage to facilitate smooth flow of the pressurized fuel from the passage into the discharge port and reduce the amount of material required for the pump housing.

The Performance of Centrifugal Compressor Channel Diffusers

Abstract: Test results pertaining to the characteristics of single-stage centrifugal compressors with backswept impellers and channel-type diffusers are presented and analyzed to formulate major performance criteria influencing maximum diffusion capability. For any given stage, it was determined that stage surge (when triggered by diffuser stall), occurred near a constant mean stream velocity diffusion ratio between the impeller tip and diffuser throat. This diffusion ratio attained a maximum value of 1.8 for impeller tip Mach numbers less than unity, but was not unique for all stages, being more intimately coupled with throat blockage accumulation as a function of diffusion rate. This was identified by testing some vaned diffusers beyond the stall limit where rapid blockage accumulation precipitated an immediate decrease in channel diffuser and system static pressure recovery. The results of various experiments in the vaneless space are also described to illustrate the sensitivity of the vaneless space flow upon centrifugal compressor performance.Copyright © 1982 by ASME

Lock-up clutch for a hydraulic unit

Abstract: A lock-up clutch having high durability and high reliability of operation is provided in the present invention. Said lock-up clutch comprises a pump impeller connected mechanically with a prime mover, a power shaft, a turbine runner which transmits a driving force given by said pump impeller through a fluid to the power shaft, a stator which forces the circulating flow of a fluid to said pump impeller from said turbine runner, and a one-way clutch which restricts unilaterally the direction of rotation of said stator, wherein the lock-up clutch for a hydraulic unit featuring the provision of a lock-up clutch installed between said pump impeller and said turbine runner to transmit input from the power shaft of said prime mover to said turbine runner by direct, mechanical connection without a medium of a fluid, and of a vibration damper absorbing the torsional vibration from the prime mover or the power shaft when said lock-up clutch is operated, and the installation of said vibration damper in the outside of a circulation flow passage near the inlet caliber of said turbine runner.

A method of driving the impeller of a liquid pump by means of a brushless A.C. motor, and a liquid pump for carrying out the method

Abstract: The invention relates to a method and apparatus for driving the impeller (5) in a turbo-type liquid pump operating at relatively low power and relatively high delivery head by means of an a.c. motor (2). The invention is mainly characterized in that the motor (2) is driven from a static inverter (6) which operates at an operating frequency of 100-1000Hz. This enables high specific speed impellers to be used, and therewith provides a considerable increase in the efficiency and capacity of the pump at unchanged motor sizes.

Free spool inducer pump

Abstract: Fluid pumping apparatus comprises (a) a housing, (b) an impeller rotatable in the housing to discharge fluid centrifugally outwardly, (c) a rotary spool having an inducer section through which intake fluid passes to the impeller, (d) a rotary diffuser associated with the rotary spool and having driving vanes located at the inlet of the diffuser and outwardly of the impeller periphery for rotatably driving the spool in response to outward flow of said discharged fluid against and between the vanes.

Portable sweeping device

Abstract: A portable sweeping device which operates with an air-blast flow, and comprises a housing having a handle arranged at the upper end, and a fanwheel blower or impeller arranged in the housing and driven by an internal combustion engine arranged in the direction of the axis of rotation of the blower; the blower generates an air flow which exits through an air discharge outlet of the housing. The axis of rotation of the fanwheel blower is arranged at least substantially vertically during use.

Measurement of Three Dimensional Flow Field behind on Impeller by Means of Periodic Multi-sampling with a Slanted Hot Wire

Abstract: In order to measure a three dimensional flow field and turbulent characteristics behind an impeller, a periodic multi-sampling measuring system has been developed which consists of a slanted single hot wire probe connected to a pulse motor, a scanning pulse generator, an analogdigital converter and a micro computer. With this system, three components of the mean velocity and the six Reynolds stresses in a complicated turbulent flow can be determined more accurately than with the conventional methods. Typical experimental results are presented for a measurement of a flow field immediately behind an axial flow impeller to show the availability of this measuring system.

Open inlet blender

Abstract: A blending apparatus comprises a generally cylindrical casing bounded by top and bottom walls, the top wall having a central solids inlet for introduction of solids by gravity flow into an impeller mounted for rotation in the casing and in coaxial alignment with the solids inlet. The impeller has one or more spaced plates and impeller vanes mounted thereon which extend radially away from a central opening in the upper plate thereof, the central opening being aligned in open communication with the solids inlet and disposed in closely spaced relation to the top wall in such a way to prevent backflow of materials from the chamber formed in the casing through the upper solids inlet. Tangentially directed fluid inlet and outlet ports are disposed in the casing's cylindrical wall and the inlet port is disposed in outer radially spaced relation to the impeller preferably with the outlet port spaced below the inlet port and impeller for discharging intermixed materials from the chamber. A pump is provided to pump fluids into the fluid inlet port for mixture with the solids passing through the impeller.

Single-stage, multiple outlet centrifugal blower

Abstract: The rotatable impeller of a single-stage centrifugal blower is housed in a casing one side of which comprises a spiral plenum having an opening which extends along a predetermined limited portion of the perimeter of the impeller and the other side of which includes a port located near the periphery of the impeller but displaced from the opening of the plenum so that it is out of register with that opening. The spiral plenum includes an exit section that provides a first fluid outlet from the casing, and the port serves as a second, independent fluid outlet.

Strainer mill for swimming pool pump intake

Abstract: A strainer mill mounted in the intake opening of an impeller pump in a swimming pool water circulating system, including a perforated strainer plate mounted transversely of the flow path of water into the impeller pump and a rotary cutter mounted on an extension of the impeller shaft on the intake side and in close proximity to the strainer plate for shredding leaves and other debris received from the swimming pool before entering the impeller pump. The strainer mill is also characterized by a collector receptacle having a sump and an inlet and outlet mounted in the flow path between the swimming pool and the strainer mill for collecting heavier and harder particles which cannot pass through the perforated strainer plate and which are thrown back by the rotary cutter blade.

Pump comprising a canned motor

Abstract: In a pump comprising a slotted tube motor, the ventilating procedure is carried out by the water entering a rotor chamber and being caused to circulate by means of the rotating rotor in such a manner that a circulating ring of liquid is formed within the rotor chamber, and that the air present in the chamber is pressed towards the axis of rotation of the rotor. The liquid flows from a pump room into the rotor chamber through a bearing slot in a front sliding bearing situated at the impeller of the pump. Liquid from the ring of liquid adjacent the rear sliding bearing is carried into a bearing slot in the rear sliding bearing by way of a connecting duct formed in part in the bearing sleeve. This sliding bearing opposes an air duct closed by a vent plug. The rotor chamber and the air duct are interconnected solely through the bearing slot in the rear sliding bearing.

Hydraulically-operated frictional engagement device

Abstract: A fluid torque converter equipped with a direct-coupling clutch comprising a front cover fixed to the pump impeller of the fluid torque converter, and a clutch disk axially slidably mounted on the output shaft of the fluid torque converter and disposed between the front cover and the turbine runner. A friction plate affixed to a friction surface formed on the front cover is divided into two portions, namely, a radially outer portion made of a frictional material having a large coefficient of dynamical friction and a large heat capacity and a radially inner portion made of a frictional material having a large coefficient of statical friction and a high compressive strength.

Differential mass flowmeter

Abstract: A flowmeter is provided for receiving a plurality of fluid streams and providing signals representative of the mass flow rate of each stream and the differential mass flow rate of any selected pair of the streams. A housing defines a flow channel to accommodate each stream to be measured. An impeller is rotatably mounted in each channel to impart measured angular momentum to the fluid flowing in that channel and all of the impellers are driven by a common turbine and shaft. The impellers are each resiliently coupled to the shaft so that the impellers lag behind the shaft by an amount proportional to the angular momentum imparted by each impeller to the fluid in its respective channel. Pick-off means associated with each impeller produce lag signals representative of the impeller lag angle and the lag signals are applied to a signal processor that produces individual mass flow rate signals and differential mass flow rate signals representative of the difference in mass flow rate of any two selected fluid streams.

The Effect of Inlet Distortion on the Performance Characteristics of a Centrifugal Compressor

Abstract: The present paper concerns itself with the effects of total pressure (and thus velocity) distortion on performance characteristics and surge margin of centrifugal compressors. Both radial and circumferential distortions were investigated. The performance tests as well as the velocity measurements within the impeller passages were carried out with a low speed compressor test rig with the inlet honeycomb as the distortion generators and compared with the case of “no distortion” as a datum. The results indicated that the inlet distortion exerted unfavorable influences on the efficiency and the surge margin of the given compressor, though the influence of the radial distortion was much stronger than that of the circumferential one. Various distortion indices were further examined in order to correlate the performance to the inlet distortion.Copyright © 1982 by ASME

An Experimental Investigation of Rotating Stall Flow in a Centrifugal Compressor

Abstract: The flow through a centrifugal compressor impeller and a vaneless diffuser was investigated using unsteady pressure transducers and stationary probes when the compressor operated in the rotating stall region of the compressor map. The inlet velocity profile of the impeller was measured with traversing probes and was found to be significantly different from the profiles measured in an unthrottled condition. A zone of reverse flow was detected close to the suction duct wall as well as a strong swirl induced by the impeller. Circumferentially and meridionally spaced transducers made it possible to determine the stall frequency and the number of stall cells. The amplitude of the flow distortion as a function of meridional position was calculated from meridionally spaced transducers.Copyright © 1982 by ASME

Fan unit for use with duct systems

Abstract: A fan unit is designed for installation in ducting systems or in similar casings in air conditioning and ventilation systems. The fan unit has a freely turning radial impeller without any spiral housing and has a driving motor for the impeller. Downstream from the outlet of the impeller, there is a guiding structure for redirecting the flow coming radially out of the impeller to an axial direction.

Centrifugal pump assembly

Abstract: An improved centrifugal pump of the end suction type having a mechanical seal and a ball bearing contained in a unique stuffing box about a rotating impeller shaft. The box positions the bearing close to the impeller and reduces the bending movement of the shaft at the seal in severe services, e.g., pump startup conditions in drilling mud systems. Also, the box is arranged for the ready removal or replacement of the machanical seal or bearing. The pump has a casing defining an annular chamber wherein an impeller is driven by rotatable pump shaft. The box is mounted in a cover secured to the casing. The cover has a concentric central opening providing an annulus about the shaft. The box is seated by step surfaces in the central opening and secured to the cover by bolts. The mechanical seal is mounted about the shaft against an inwardly facing stepped surface within the box. The bearing is releaseably mounted on the shaft and has an external cylindrical surface seated against an outwardly stepped surface in the box.

Control of Self-Excited Flow Oscillations in Vaneless Diffuser of Centrifugal Compression Systems

Abstract: Experiments were conducted to evaluate the effectiveness of axisymmetric diffuser exit throttle in delaying the occurrence of self-excited flow oscillation in vaneless diffusers. Sharp edge rings were installed at diffuser exit in order to change the exit flow area. Tests were carried out with the rings attached to one or both of the diffuser walls. Steady and unsteady flow measurements were used to determine the flow field in the diffuser at the onset of the flow oscillations. Results showed that the occurrence of flow oscillation was continuously delayed as the diffuser exit flow area was reduced for all these configurations and impeller speeds. Comparison between the performance of the compression system with and without diffuser exit blockage indicated that although large losses occur at high flow rates, the use of diffuser exit rings resulted in overall diffuser performance improvement at low flow rates. Retractable diffuser exit rings would therefore be ideal for centrifugal compression systems with vaneless diffuser.Copyright © 1982 by ASME

Apparatus for the extraction of water soluble substances from fruit and vegetable pressings and vegetable raw materials

Abstract: Apparatus for the extraction of fruit and vegetable pressings and plant raw materials in a closed system The extraction is effected by simultaneous mechanical and hydrodynamic effects on the materials, the fruit or plant mass being subjected to several extractions in two cyclically alternating modes of fountain-type and turbulent agitation with different intensities with bladed agitator tip speeds in an over-all range of 3 to 25 m/sec The apparatus has a closed heat-insulated vessel with internal draining wall, a conical bottom, a cover having a ventilation opening, and an opening for the raw material, with a driving unit mounted on the cover with two driving speeds The driving unit is a shaft on the lower end of which there is mounted an impeller, the shaft resting on a special bearing supported on a grid of blades rectifying the material flow, an elongated diffuser surrounding the impeller, the impeller together with a suction unit leading to the diffuser being fixed to the bottom of the vessel