Model of hydraulic machines
(57) Abstract:Usage: in the experimental equipment designed for the study of hydrodynamics of the flow in the impellers of hydraulic machines by visualizing them in the thread. The essence of the invention: hydraulic machines includes a housing 1 with a transparent cover 2, the impeller 4 with the blades 5, the leading disk (D) 6 and a transparent covering disc 7, the shell (About) 8 box 9. About 8 forms with D 6 cavity in which is placed a porous permeable wall 10, the Central camera (K) 11 and peripheral To 12. Central To 11 filled with liquid dye 13, and the peripheral 12 is in communication with the interscapular channels 14 of the wheel 4 through holes 15 in D 6. The partition 10 is installed in 12 between window 8 and 9 On holes 15 D 6. In 11 posted by porous insert 16 adjacent to the porous permeable partition 10 in the coupling zone 11 and 12. Porous permeable partition 10 is in the mode of the capillary pump and provides a constant flow and concentration of dye 13 in the coated liquid. 2 Il. The invention relates to the experimental equipment used to study the hydrodynamics of the flow in the working wheels of hydraulic machines by visualizing in neither is abuse on the shaft of the impeller with vanes, leading and transparent coating disks adjacent to the master drive shell with window, separated by permeable partition into two chambers, one of which is placed a porous insert, in the pores of which contain a dye soluble in the fluid and the other chamber is in communication with the interscapular channels through the holes in the master disk (ed. St. USSR N 1564504, CL G 01 M 10/00, 1988).The disadvantage of this hydraulic machines is the reduction over time of the concentration of the dye in the dyed fluid.The purpose of the invention is the improvement of the uniformity of the concentration of dye in the fluid.This objective is achieved in that the permeable partition wall made of porous material and is placed in the cavity peripheral chamber, and the liquid dye and the porous insert is placed in the Central chamber, and permeable partition is adjacent to the porous insert in the coupling zone of the cameras.Proposed disposition of elements of hydraulic machines, and performing the permeable walls of the porous material provides a uniform flow of dye through the porous insert and a permeable medium that performs the function ketsa pumped liquid.In Fig. 1 shows a longitudinal section of the hydraulic machine; Fig. 2 - section a-a in Fig. 1.Model of hydraulic machines includes a housing 1 with a transparent cover 2, accommodated in the housing 1 on the shaft 3 impeller 4 with the blades 5, the lead 6 and the transparent coating 7 discs adjacent to the master drive 6 shell 8, provided with a window 9 and forming with the leading 6 disc cavity in which is placed a porous permeable wall 10, the Central chamber 11 and the peripheral chamber 12. This Central chamber 11 filled with liquid dye 13, and the peripheral chamber 12 is in communication with the interscapular channels 14 of the impeller 4 through holes 15 in the master disk 6. The partition 10 is installed in the peripheral chamber 12 between the window 9 of the shell 8 and the holes 15 of the master drive 6. In the Central chamber 11 posted by porous insert 16 adjacent to the porous permeable partition 10 in the coupling zone of the cameras 11 and 12.Model of hydraulic machines is as follows.The pumped fluid enters the impeller 4, passes through the interscapular channels 14 and fed into the discharge region. Part of the pumped liquid enters the gap between the housing 1 and the impeller 4 and through the window 9 of the shell 8 paradiese washer surface of the latter is painted, dissolving the dye 13 contained in the pores of the surface layer of the partition 10. The thus prepared liquid exits through the holes 15 in the master disk 6 as clearly distinguished on the background of the main flow of the fluid streams and visualizes the trajectory of the line current, fixed photoconverters through the transparent covering disc 7 and the cover 2 of the housing 1. In the modeling process as dissolution of the dye 13 porous insert 16 absorbs the dye 13 contained in the chamber 11, and its capillaries transports it into the porous permeable medium 10. In turn, the capillary walls 10 take dye 13 in the surface layer of the specified partition in the area of its flow of pumped fluid. Thus, the porous insert 16 and the porous permeable partition 10, the operating mode of the capillary pump, provide a continuous flow and concentration of dye 13 in the coated liquid.The use of porous elements (inserts 16 and permeable walls 10, operating in the mode of the capillary pump, allows the release chamber 11 from a porous material to increase her amount of dye and prolong the time which eliminates the need for preliminary impregnation of the porous material of the dye. Improving the efficiency of the color imaging fluid at small pressures. MODEL of hydraulic machines, comprising a housing with a transparent cover placed in the housing on the shaft of the impeller with vanes, the leading and transparent coating disks and adjacent to the master drive shell with window, forming with leading disk cavity communicated with interscapular channels wheels through the holes in the master disk and comprising a permeable medium located in the cavity of the shell between the box and the holes of the master drive, and Central and peripheral cameras, one of which is placed the liquid dye and the porous insert, characterized in that, with the aim of improving the uniformity of the concentration of dye in the fluid, the permeable partition wall made of porous material and is placed in the cavity peripheral chamber, and the liquid dye and the porous insert is placed in the Central chamber, and permeable partition is adjacent to the porous insert in the coupling zone cameras.
FIELD: oil producing industry: testing facilities.
SUBSTANCE: proposed stand contains one fixed clamping device and at least two self-aligning clamping devices, all coupled with mounting bases. Self-aligning devices are made for mounting under weight of downhole hydraulic motor at angle equal to angle of deflection of moving section relative to spindle section of downhole hydraulic motor in deflector assembly. Self-aligning devices consist of three plates, namely main, intermediate and turnable ones. Main plate is coupled with mounting base of stand, being provided with at least three longitudinal slots on its surface. At least three bushings are installed in intermediate plate. Bushings are pressed on by flat springs by means of which intermediate plate is lifted over main plate for displacement on ball bearings along slots in main plane along main plate. Turnable plate is installed on axle secured in intermediate plate, being lifted over intermediate plate by means of spring installed on axle for free turning relative to intermediate plate.
EFFECT: enlarged testing capabilities of stand for downhole hydraulic motors including tests in deflector assembly.
FIELD: aircraft industry; gas-turbine engines.
SUBSTANCE: invention relates to diagnosing condition of automatic control systems of aircraft gas-turbine engines, particularly, to diagnosing systems of fuel-feed plunger pumps. According to proposed method of diagnosing condition of plunger pump to rotor space of which drain main line is connected, values of leaks are determined. This is done by measuring fuel flow rate in drain main line under test conditions set by rate of fuel at pump outlet. Device for implementing the method is made in form of drain main line connected to rotor space of pump, said main line is furnished with calibrated restrictor and restrictor pressure differential sensor determining value of fuel passed along service line.
EFFECT: possibility of diagnosing condition of plunger pump in service.
3 cl, 1 dwg
FIELD: mechanical engineering; hydraulic machines.
SUBSTANCE: invention is designed for use in sphere of condition monitoring of hydraulic machines. According to proposed method, failure of hydraulic pump in hydraulic machine is detected, and service life of pump till failure is estimated. Delivery pressure, oil temperature and pressure differential on drain filter are measured, and correlation relationship between pressure differential on filter is found and basing on said correlation relationship, characteristic pressure differential of filter is calculated. Using oil temperature-pressure differential correlation function, characteristic pressure differential is corrected to exclude variable component caused by oil temperature. Time increase of long-term trend and short-term trend of corrected pressure differential is calculated. Failure of pump is forced, or service life of pump is evaluated basing on degree of difference between long-term trend and short-term trend.
EFFECT: provision of possibility of revealing forecasting parameters of failure of pump to prevent pump failure by forecasting.
18 cl, 10 dwg
FIELD: oil producing industry.
SUBSTANCE: invention relates to complex testing of oil-well screw pumps. Proposed test set for screw pumps contains pump drive, frame, flow meter, pressure transmitters installed on taps and hydraulically coupled with each space of pump, suction line and delivery line on which delivery pressure regulator is installed. Set is furnished with header and control system made in form of shutoff members. Header is connected to suction and delivery lines and it communicates with taps having equal flow channels whose areas are not less than flow section of pump. Shutoff members are mounted on header between all taps. Drive is made with possibility of regulation of rotational speed.
EFFECT: provision of possibility of changing of effective length of pump at its constant design length.
FIELD: engines and pumps.
SUBSTANCE: bench for testing of hydraulic down hole engines contains frame with fixtures for engine body, main tank of working liquid, pump to supply working liquid into an engine, the first and the second successive installed brake mechanisms connected to an engine shaft and a measuring system of an engine working characteristics. The bench is equipped with an additional tank of working liquid, with a case to receive working liquid drained from the engine, the said case is installed between the main and additional tanks; the bench is also equipped with a discharge pump and a step-up tooth gear assembled before brake mechanisms and providing two speed gear controls. In the gear control the first gear transfers torque from the engine via the step-up gear to the shaft of the first brake mechanism while the second gear transfers torque directly from the engine to the shaft of the first brake mechanism.
EFFECT: there is achieved a possibility to test a moment of force on a take off shaft in a minimum to maximum power mode of a complete range of gerotor engines and turbo drills.
2 cl, 9 dwg
FIELD: engines and pumps.
SUBSTANCE: invention relates to experimental gas dynamics and can be used in analysing the working processes in positive-displacement machines. A tight working chamber houses a dual-action piston so as to form two working spaces communicating via a self-operating valve arranged on the piston. In short equal time intervals Δτ, momentary values of piston position H and height h of the valve plate uplift are measured to determine the momentary force of gas pressure Pg on the valve plate using a cited formula.
EFFECT: determination of the gas flow force acting on the positive-displacement compressor valve plate at varying valve inlet and outlet pressures.
FIELD: engines and pumps.
SUBSTANCE: invention relates to machine building and can be used in petroleum industry for both testing the screw pumps, and assembly and running-in. The test bed incorporates an electric drive, a reduction gear, a frame, a hydraulic system, a pump parameter measurement and recording system, the test bed control system furnished with a thyristor-based frequency converter. The hydraulic system pressure section is arranged between the screw pump to be tested and the reduction gear to form a hydraulic space limited by a hollow shaft mounted inside the reduction gear output shaft inner space and the pressure section housing rigidly linked with the tested pump holder. A flexible shaft is arranged inside the hollow shaft and the pressure section housing to move axially relative to the hollow shaft and to transmit rotary motion. The flexible shaft links the tested pump screw with the reduction gear shaft.
EFFECT: expanded performances of the test bed, higher accuracy and reliability of measurements.
6 cl, 1 dwg
FIELD: engines and pumps.
SUBSTANCE: method is designed to be used in oil production industry to control the quality of the oil bottom-hole sucker-rod pumps (BHSRP) steadiness. Diagnosing the BHSRP steadiness consists in measuring the electric-drive motor rotor rpm instantaneous values in operation, determining the minimum rpm instantaneous value magnitudes on lifting the rod v1(min) and downing it v2(min) and comparing the obtained magnitudes between themselves for one pumping cycle with the steadiness state satisfying the following condition, i.e. |v1(min) - v2(min)| < 0.1 · (v1(min) + v2(min)) / 2.
EFFECT: higher accuracy of balancing the bottom-hole sucker-rod pump drives.
FIELD: engines and pumps.
SUBSTANCE: invention is related to the field of maintenance and repair of machines and equipment, in particular, to methods for testing of displacement rotary pumps. Method of pump testing consists in creation of test pressure at pump discharge and measurement of testing liquid flow rate at the pump suction, while pump shaft is fixed. Method reduces energy intensity of testing process, metal intensity and cost, and provides for universality of test bench.
EFFECT: reduction of testing process energy intensity, lower metal intensity, lower cost and universality of test bench.
FIELD: engines and pumps.
SUBSTANCE: invention relates to test bed firing and can be used for testing axial rotor adjustable hydraulic pumps and engines. Proposed test bed comprises drive shaft 1 with tested axial piston hydraulic pump 54, hydraulic pump 2 of hydrostatic drive (HSD) or gear pump 3 coupled therewith. It incorporates also braking lever 33 for shaft of tested adjusted axial piston hydraulic engine 55 or hydraulic engine 18 HSD. Hydraulic system comprises first 11 and second 12 hydraulic tanks, first suction line 4 with outlet communicating with suction chamber of hydraulic pump 54 or 3, and its inlet communicated with outlet of first hydraulic tank 11, said suction line comprising throttle 7. This system comprises also delivery-suction line 63 with its inlet communicating with pressure chamber of hydraulic pump 55, 2 or 3. Outlet communicates with the inlet of first hydraulic tank 12 via drain line 50, and, via feeder line 42, with feeder pump 43. The system includes line 60 to control governors of hydraulic pump 54 and hydraulic engine 55, which incorporates valve servo drive 56, pressure gage 57 and adjustable drain valve 58. High-pressure line 44 passes from outlet of hydraulic pump 54 through inlet and outlet of hydraulic engine 55 and communicates with delivery-suction line 63 upstream of its throttle 7. Inlet of drain line 50 communicates with drain hole of case of hydraulic pump 54 and case of hydraulic engine 55, while its outlet communicates with the inlet of first hydraulic tank 11. Inlet of feeder line 42 communicates with second hydraulic tank 12, while its outlet communicates selectively with inlet of first hydraulic tank 11 or inlet of control line 60. Outlets of the latter serve for connection to unions of governors of hydraulic pump 54 and hydraulic engine 55.
EFFECT: expanded performances due to increased number of tested hydraulic positive-displacement drives.
6 cl, 1 dwg