Showing papers on "Impeller published in 1973"

Computer program for predicting off-design performance of centrifugal compressors

Abstract: A FORTRAN program for calculating the off-design performance of centrifugal compressors with channel diffusers is presented. Use of the program requires complete knowledge of the overall impeller and diffuser geometries. Individual losses are computed using analytical equations and empirical correlations which relate loss levels to velocity diagram characteristics and overall geometry. On a given speed line compressor performance is calculated for a range of inlet velocity levels. At flow rates between surge and choke, individual efficiency decrements, compressor overall efficiency, and compressor total pressure ratio are tabulated. An example case of performance comparison with a compressor built by a commercial engine manufacturer is presented to demonstrate the correlation with limited experimental data.

Diffuser for a centrifugal compressor

Abstract: A diffuser for a centrifugal compressor has a body defining diffusing passages extending tangentially and radially from an annular space around the circumference of the compressor impeller. These passages diverge in the direction of flow and trend smoothly in cross-section from rectangular at the inlet to circular at the outlet in the preferred case. The cross-section of the passage follows the relation X/A S + Y/b s 1, WHERE X AND Y ARE COORDINATES, A AND B ARE WIDTH AND DEPTH PARAMETERS, AND S IS A SHAPE FACTOR WHICH VARIES PROGRESSIVELY ALONG THE DIFFUSING PASSAGE FROM NEAR INFINITY AT THE INLET TO PREFERABLY 2 AT THE OUTLET.

Pump impellers for cooling systems of i.c.e.

Abstract: This composite impeller is intended for use in a pump incorporated in the cooling system of an internal combustion engine and comprises a metal hub permitting the tight fitting of the impeller on the pump shaft, and an impeller proper having one outer peripheral portion of said hub embedded therein, said impeller consisting of a mixture of thermosetting resin having a low coefficient of water absorption when heated and of a waterrepellent filler not liable of undergoing appreciable changes in its dimensions in the presence of water; this composite impeller is capable of operating satisfactorily in engines having rotational speeds of up to 9,000 r.p.m. under temperatures of the order of 130*C.

Agitator and tank apparatus

Abstract: This invention relates to a tank and agitator apparatus comprising a vertical tank having an annular side wall, and an agitator mounted in the side wall of the tank. The agitator includes a shaft rotatably mounted in the side wall of the tank, and an impeller mounted on the end of the shaft within the tank. A deflection means is located between the impeller and the mounting means for directing impelled liquid outwardly around the annular wall of the tank. Also included are means for rotating the shaft and impeller means in a direction to draw the liquid from the location of the tank opposite the mounting means and move it in a direction toward the deflection means whereupon it is directed in opposite directions around the annular wall of the tank to meet at the location of the tank opposite the mounting means.

Impeller type engine

Abstract: An impeller type engine is disclosed which includes two cover members joined to form a housing, two cam members disposed in the housing facing each other to form a sinuous track of uniform width, a shuttle slidably disposed in the track, an impeller to carry the shuttle as it slides in the track, and means for introducing and igniting a fuel charge and discharging the combustion by-products.

Vertical shaft impeller pump apparatus

Abstract: There is disclosed vertical shaft impeller pump apparatus especially suitable for bilge or other applications where installation space is limited. The pump apparatus, including preferred embodiments thereof, is characterized by high pumping efficiency, long service life, compactness, and flexibility of assembly geometry whereby orientation of the top portion, the discharge means, and the base of the apparatus are variously alignable relative to one another.

Motor pump combination

Abstract: To permit submerged operation, the motor is formed as a synchronous motor, in which a coil is totally encapsulated in plastic material, the coil being toroidal and having end ferromagnetic disks above and below the coil, the disks being alternately supplied with inner pole faces, in the form of sections or strips of a cylinder, defining a cylindrical space within which a permanent magnet rotor can rotate. The cylindrical strips are formed with cut-outs, so that the magnetic field will be unsymmetrical, thus establishing a rotating field. The pole faces are separated from the rotor by plastic material, the rotor being integrally connected to the hub of an impeller for the pump.

Side inlet means for centrifugal pumps

Abstract: Side inlet means for a centrifugal pump has an inlet connected to the source of fluid to be pumped, and means forming a fluid flow passage extending through said side inlet means which defines, a diverging passage section, a shaped curved passage section, and a straight cylindrical passage section of varying length for delivering fluid to the suction eye of the impeller for the centrifugal pump having a velocity distribution which improves the efficiency thereof. Additionally, the side inlet means above described wherein the straight cylindrical passage section will have a predetermined length sufficient to permit operative association with inducer means for increasing the range of operation of the centrifugal pump.

Rotating element fluid seal for centrifugal compressor

Abstract: A vertical dynamic seal such as may be used between the high pressure discharge chamber of a centrifugal gas compressor and a chamber in which the driving machinery for the impeller of the compressor is contained, and formed by the opposing faces of a seal stator and a seal rotor vented at an intermediate location along the axial extent of the seal to the space at the inlet or suction side of the impeller, is provided with outwardly-directed bore means in the venting passage to obtain a pumping effect to the inlet side of the impeller.

Centrifugal pump for processing liquids containing abrasive constituents, more particularly, a sand pump or a waste-water pumper

Abstract: A centrifugal pump for processing liquids containing abrasive constituents comprising a housing with a suction opening and a delivery opening and an impeller and having on either side sealing faces located at least partially on the outer side of a sealing slot in which slot, near the entrance side, an annular chamber is formed and means are provided for rotating the liquid in the chamber and near the outer circumference radial, outwardly directed ducts communicate with the annular chamber and open out by a diameter which is smaller than the diameter of the impeller.

Crop feeding mechanism for axial flow combines

Abstract: An axial flow combine of the type embodying threshing and separating means in the form of a generally cylindrical casing within which a vaned rotor operates and which defines a threshing region and a separating region. Helical impeller vanes on the forward end of the rotor impel the crop material rearwardly into the threshing region for conduction therethrough and from thence into and through the separating region. To enhance the capacity of the casing and rotor to handle crop material, a pair of transverse sheets which extend at a slight angle to each other so that one sheet is slanted in one direction relative to the rotor axis and the other sheet is slanted in the opposite direction, cooperate to establish, in effect a front wall for the casing. These sheets cooperate with the rotating impeller vanes to receive the backlash material which issues from the impeller and direct it forwardly into the working region of the latter.

Engine turbocharging system with vented compressor bearing

Abstract: Disclosed is a combination of a spark ignition internal combustion engine and an exhaust gas driven turbocharger whose compressor component delivers charge air to the air induction system of the engine downstream of the engine carburetor and air cleaner. A tube provides communication between the crankcase of the engine and the impeller shaft bearing housing of the turbocharger compressor component to thereby permit entry of crankcase gases into the bearing housing thereby eliminating the ingestion of bearing lubricating oil along the impeller shaft and through the impeller shaft bearing into the compressor discharge passage when a vacuum condition exits in the compressor component as for example under engine idle condition.

Jet propulsion pump assembly

Abstract: A jet propulsion pump assembly is provided with a wear-ring of non-metallic material such as plastic, the wear-ring being installed so as to be worn in by rotation of the impeller when under load. Provision is made for reducing thrust on the impeller.

Compact high speed fuel pump assembly

Abstract: A high speed combination fuel pump for supplying fuel to a turbine engine including a centrifugal pump that develops a pressure required for turbine engine fuel systems by the use of a small diameter impeller running at turbine speed or higher RPM; fuel flow for starting and acceleration to idle turbine speed is furnished by a small positive displacement vane pump built physically into the backside of or otherwise in series or parallel arrangement with the centrifugal pump impeller. Following the start up phase of operation and at some speed below idle RPM the vanes of the impeller respond to centrifugal forces to unload the positive displacement pump whereby the centrifugal pump furnishes all the fuel.

Washing machine pump

Abstract: A reversible dual function pump for a laundry appliance which recirculates detergent water in a tub at a moderate rate when driven in a first rotary direction and which removes such water from the tube at a greater rate when driven in the opposite direction. An impeller and a volute cavity of the pump are arranged to produce a positive displacement pumping action which provides sufficient reserve pumping capacity to allow exceptional dimensional latitude in the pump construction and an internal by pass circuit for regulating internal pressure in the pump. Wide dimensional latitude in the pump components allows them to be formed of plastic materials and allows the pump to be mounted on and driven directly by a motor. Pressure regulation by the internal by pass avoids the risk of pump out in an improper operational mode and the possibility of producing suds from an excessive vacuum condition.

Recirculating gas separation means for submersible oil well pumps

Abstract: This abstract describes an improvement in down hole submersible oil pumps for pumping oil and gas mixtures, which includes a section in which the well fluid is given a helical motion within a first outer annular separation chamber, such that there is a physical separation between liquid on the outside and gas on the inside. The liquid passes onto a succeeding stage of impeller, while the gas and some liquid is returned to the first impeller stage through a second inner annular recycle chamber. The gas is vented from the inner chamber to the outside of the pump housing, while the liquid portion is recirculated through the first impeller.

Centrifugal pump diffuser

Abstract: A rotary pump having a plurality of impeller blades and a plurality of circumferentially spaced vanes located about the periphery of said blades. The blades and vanes cause the fluid being acted upon by the pump to be delivered in pressure pulses of relatively high frequency and low magnitude. The spacing between adjacent vanes is nonuniform to prohibit uniform pressure patterns in the process fluid.

Pump impeller construction

Abstract: Gear pump impellers formed of Teflon because of the softness and slipperiness of the material are difficult to connect to a metallic shaft. Yet Teflon is a very good material for gear pump impellers because of its low co-efficient of friction, chemical inertness and ability to withstand high temperatures and extreme temperature variations. In this invention a portion of the plastic is confined between a rigid central shaft spline and a cup rotatable with the shaft so that the plastic cannot flow without two-dimensional or three-dimensional distortion or tearing, both of which are resisted by the plastic.

Automotive waterpump subassembly with improved sealing arrangement

Abstract: An automotive waterpump subassembly comprises a sheet metal housing rotatably supporting an impeller drive shaft by a pair of ball bearing complements located in a sealed chamber in the housing. The outer raceway for one of the ball complements is supported on a sheet metal wall plate which is located in the middle of the housing and which is resiliently deflected to axially preload the bearing complements. A sheet metal end plate carries a ceramic face seal element which engages a carbon face seal element carried by the impeller shaft. The wall plate and end plate form a chamber which is divided into three compartments by a S-shaped baffle mounted on the impeller drive shaft. The drive shaft is hollow and closed at the impeller end by a sheet metal impeller. A radial passage in the hollow shaft is aligned with the interface of the face seal element and provides a drainage path directly from the outer compartment to atmosphere through the hollow drive shaft for water leaking past the face seal. A drainage hole in the housing communicates directly with the intermediate compartment providing a second drainage path for water before it can reach the inner compartment. The bearings are further sealed from the inner compartment.

The use of analytic surfaces for the design of centrifugal impellers by computer graphics

Abstract: This paper shows how analytic surfaces can be used to define the vanes of an impeller of a centrifugal compressor. The analysis has been given of a cubic-linear patch for representing three-dimensional geometries. An example has shown how this type of patch can be successfully used to model the geometry of centrifugal or mixed flow impellers having 'swept back vanes at the outlet. The analysis has been programmed for the Atlas computer at the Computer Aided Design Centre (CADC), Cambridge and set up in such a way that the designer can examine systematically a range of impeller shapes.

Waste pulping machine with replaceable shear members

Abstract: A waste pulping machine of the type utilizing a rotating impeller in which the impeller is provided with one or more shear members which can cooperate with one or more stationary shear members. The shear members comprise replaceable blades mounted to appropriate supports to obtain the desired shearing action. The machine further includes a sieve formed of a plurality of identical replaceable perforated arcuate members together defining a ring closely surrounding the impeller.

Flow-meter and viscometer

Abstract: Measuring apparatus of the impeller-type flowmeter kind, designed to be mounted inside a conduit for ducting a fluid flow and comprising an impeller supported for unrestrained rotation about a shaft arranged longitudinally inside the conduit. In accordance with the invention, a rotor is supported for unrestrained rotation coaxially with and downstream of the impeller and carries blades which lie substantially in planes passing through the rotor axis, whereby a comparison between the impeller and rotor rotation speeds omega and omega 1, respectively, enables the accuracy of the flow rate measurement to be monitored and can provide an indication of the viscosity of the fluid.

Textile scouring range

Abstract: A range is provided for use in washing, scouring and otherwise treating running fabric webs, especially those of a fragile nature such as knit goods and the like. The range includes a plurality of separate tanks each furnished with a plurality of rotary impellers for forcing liquid within the tank through the web which is carried along reversing paths through the tanks. Each tank comprises a separate stage which stages are adapted to be interconnected on a selective basis. Nip rolls, speed synchronizing drivers, spreader rolls and overflow chambers are provided between each stage.

Impeller wheel for torque converter or fluid coupling

Abstract: The impeller wheel has a very desirable rigidity by reason of the fact that the shell of the impeller wheel is provided with an annular support member welded to its periphery, and that each blade of the impeller wheel is welded, at its rib, to the shell.

Impeller wheel for torque converter or fluid coupling and manufacturing method thereof

Abstract: The impeller wheel of the invention comprises a shell, a plurality of blades connected in one body and a core ring, each blade having a rib at its outer periphery. Each blade seats on the inner surface of the shell and is rigidly secured, at the rib, to the shell for increased durability and rigidity of the blade structure.

Noise Generated by Low Pressure Axial Fans

Abstract: Noise generated by a fan consists of the rotating noise and the turbulent noise. These two kinds of noise have entirely different characters with respect to decay in an axisymmetric pipe. In this paper the generation and decay of these two kinds of noise are experimentally examined by changing various factors, such as the suction pipe geometry, the location and the thickness of struts, and the combination of the number of impeller blades and the number of struts. The rate of decay of the rotating noise is predictable and in most cases the noise quickly decreases in proportion to the distance from the rotor, providing that the number of impeller blades and the number of struts are properly chosen. Therefore, the noise observeda way from a low pressure axial flow fan is mostly the turbulent noise.

Self-priming centrifugal pump

Abstract: A self-priming centrifugal pump having suction and separation chambers defined within a casing, and a rotatable impeller positioned in a volute for transferring fluid from the suction chamber to the separation chamber. Reprime lift capability and priming rate are substantially improved by an elbow-shaped priming passage communicating the lower region of the separation chamber with the lower region of the volute, and by an upstanding ramp-like shoulder formed in the volute below the impeller. The improved priming passage configuration and the ramp-like shoulder are believed to effect a more efficient delivery of fluid from the separation chamber to the impeller during pump priming, and to effect a more turbulent mixing in the impeller of fluid with air from the suction chamber whereby air is efficiently entrained in the exhausted fluid and the pump is rapidly reprimed.

Impeller for food preparing machine

Abstract: An impeller is attached to the drive shaft of a food preparing machine between the bottom of the food container and the comminuting and mixing blades located therein. The impeller drives material away from the shaft toward the blade structure, and includes a drive disc mounted on the shaft, arms depending from the disc parallel to the shaft axis, and impeller portions on the arms extending therefrom at an angle with respect to a shaft radius.