SU769094A1 - Method of recording cavitation characteristic of vane pump - Google Patents

Description

pump rhythm at different values

.-. 4; .-: - V: 4- rt -; -; J: - i ---- r

viscosity

The stand is made in an open circuit and contains tanks and -2 with a system, a duva, and 3 pump driven (not shown), suction 4 and pressure, 5 pipelines with cranes 6-9, and .. mixer / L Stand contains L pressure gauges, temperature sensor 12, flow sensors 13 KL of shaft speed sensor (not shown) of the test pump 3. Capacity / partially filled with gliderin (v), and capacity 2 with degassed water (v 10-). Test nachayite nadgazirovirovan water 1Gr1I ZAKr1t6m valve 6 and openings: valve 7. The specified pressure at the inlet is set and maintained. tanks .1 into the mixer 10. After the mixer, water-glycerin mixture enters the inlet of pump 3, the viscosity of which depends on the ratio of glycerin and / eody consumption. May vary in the range.

The change in the consumption of glycerin and water is provided by adjusting the cranes and 5, as well as the boost pressure of the containers i / and 2.

The viscosity, density, and saturated vapor pressure of the water-glycerin mixture are determined by calculation according to (flow rate sensor 13 and 14, temperature sensor 12, and this table of physical properties of water and glycerin. The density of water-lysterine mixture at the pump inlet can be determined directly , for example, with the help of a radionic density meter - -. ,, ..-.--.,., ,, -, ™,. -

The method for obtaining a 1 ° 1k avtodiDi6nnoy character TegHgTHjK vane pump is as follows. .

With "values of viscosity and a constant value of the angular velocity of the impeller, the wheels set a constant inlet pressure, cooTBefC: ffiyiStfi; it is the cavitating mode of retracting the impeller and, accordingly, each viscosity value, measure the performance

the pump. i, - ;; -; - ::. ,:,, i ..., .- -:. “.-: -;

; lock mode (point / in Fig. 3) with the minimum specified flow rate

.. ,,.;,.,, J ...; - .-,::,: ..-.

QI I get lib6 by Sharing

network resistance at PBX, 12-KUPa, or at constant network resistance KnelflH by reducing the input pressure to 12 10 Ya. Then, with PBI, const, due to the formation of an all-glycerine mixture, the viscosity of the fluid and the input to the pump are constantly increased to a maximum -----: .- -, 2

This value is v 6- as a result of what the flow of fluid through, the pump rises to Qa 3.25 l / s. This process corresponds to the curve. 3. Subsequent testing of the pumping unit in a similar way. The process of changing the flow rate of the liquid Q with increasing v at PBX 16; the corresponding is –4 curve, and the PBI 20-U Ya curve is 5-6.

On; FIG. 2, where the characteristics of the pump and its external network are depicted, the intersection of the characteristics determines the operating point of the pump in zero-volt mode (point 1). On the | Cavit | Zion1Nogo mode, lock the pump wheel pai6o4ero when pumping fluid with low viscosity,

0 for example / water, (v) fluid flow Qa is determined by point 2, which lies across the intersection of the network characteristic with the T-drop (pull-off) branch of the 1 1-a characteristic. An increase in .p, db, bones liquidates the flow of the water-blend mixture at the pump inlet, Haitpitffep with v at PBX const, causes the following: a cavitational disruption of pump operation occurs at point 5 at. Then, the viscosity increase process will be accompanied by an increase in the flow rate of the liquid according to the curve.

5 On fi. 3, where is represented ecolerim | tonal dependence Q / (v), built on the basis of the results of kaitational testing of a screw-centrifugal pump on a water-hydriodio mixture of yours at a constant

0 angular rotational speed of the pump shaft

01 1780 - curves / -2, 3 and, 5-6, corresponding to S (.. «V.

vetting cavitational locking of the front screw {th auger lr RYAH -

45 12-103; 18-103; ,, 20.1рз Яс. V; , ::

. Graph KI and FIG. 3 may be perebris in: the cavitating characteristic of the Lakr / pump (Qj for different values of v const (see Fig. 4) ..,

0 Q / (v) dependencies can also be constructed from test results; For which the viscosity of the working fluid does not increase, as in the example considered, but decreases. H

55 YSSCHLGoMn e DMnog o Cyui's method, it shrinks the number of tests necessary to obtain (cavitating) the flow of the oil, reduces labor; ayos test capacity.

fV shlula inventions

With the Osab getting kaitatsiovnry ha; Test pump Loystryr by testing it at 65 at different values of the viscosity of the pumped liquid and at a constant value of the angular velocity of the pump impeller, characterized in that, in order to reduce the labor intensity, a constant pressure corresponding to the cavitation mode is established at the pump inlet. lock the impeller and

769094

according to each value, the pump capacity is measured in the field.

Source of information, taken into account in the examination:

1. Yaremenko OV, Testing of pumps, M., “Mechanical Engineering, 1976, p. 137, 142.

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 I

but

/ y ..

  -:. f -; i ffiyfifss iij-:

94

;. G .--. L-- l1-Ll-A ----- .. “i. : r

 .v ;;, - r - :: -.-, bi ::; v ;: jJ,: ui ;; ii - -Aibb; hi - 769094

Claims (1)

Claim The method of obtaining ...... cavitation ha. · Characteristics of the vane pump by testing it at “different values of elm ^{5 of the} bone of the pumped liquid and at a constant value of the angular velocity of the impeller of the pump, characterized in that, in order to reduce the labor input a constant pressure is set in the pump, corresponding to the cavitation locking mode of the impeller, and according to each viscosity value, the pump performance is measured. Source of information accepted in 5 attention during the examination: 1. Yaremenko O. V., Testing of pumps, M., "Mechanical Engineering", 1976, p. 137, 142. * => "" ·