CN203742973U - Closed testing device for net positive suction head of submerged pumps - Google Patents
Closed testing device for net positive suction head of submerged pumps Download PDFInfo
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- CN203742973U CN203742973U CN201420128811.5U CN201420128811U CN203742973U CN 203742973 U CN203742973 U CN 203742973U CN 201420128811 U CN201420128811 U CN 201420128811U CN 203742973 U CN203742973 U CN 203742973U
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Abstract
The utility model belongs to the field of fluid machines, and particularly relates to a closed testing device for the net positive suction head of a water-filling-type submerged pump and a well submerged pump. The closed testing device is composed of a cavitation tank, an inlet valve, an exocentric diffusion pipe, a suction pipe, the submerged pumps, a thermometer, an inlet pressure gage, a transition pipe, a first sealing joint, a rotating speed measuring meter, an outlet pressure gage, a water drainage pipe, an outlet pressure measuring pipe, a second sealing joint, a flowmeter upstream straight pipe section, an inlet pressure measuring pipe, a rotating speed sensor, a flowmeter, a flowmeter downstream straight pipe section, a flow control valve, a water injection valve, a vacuum pump, a water drainage valve, an air exhaust pipe, a separating plate, a liquidometer, an air extraction valve and an air drainage valve. The thermometer, the inlet pressure gage, the outlet pressure gage, the rotating speed sensor, the rotating speed measuring meter and the flowmeter are used for measuring key parameters of the net positive suction head of the submerged pumps. The closed testing device for the net positive suction head has the advantages that the critical net positive suction head of the submerged pumps under different flow quantities can be measured, and the problem that a cavitation performance test of the submerged pumps cannot be carried out can be solved.
Description
Technical field
The invention belongs to field of fluid machinery, relate to the test of submersible pump hydraulic performance, refer in particular to a kind of closed test stand that can measure Water filling type submersible pump and well use submersible pump net positive suction head.
Background technique
Submersible pump is a kind of universal machine that is widely used in industry, agricultural and various engineering fields.Its structure is that submersible motor and water pump share an axle, and different with water pump from general land, submersible pump does not have intake line.
The hydraulic performance index of water pump generally includes flow, lift, air horsepower, efficiency and net positive suction head, and net positive suction head is an indirect measurment, must be calculated and be obtained by data such as pump entrance pressure gross head, pressure for vaporization heads.Mass data proof cavitation damage is the direct arch-criminal who causes water pump to break down, the same with other water pumps, and submersible pump is also usually because reasons such as slipping into the degree of depth and large flow rate working conditions causes cavitation damage to cause losing efficacy.But up to the present, all submersible pump products and standard all fail to provide net positive suction head index.
1 grade and 2 grades > > of existing standard GB/T3216-2005 < < rotary motive power pump hydraulic performance acceptance trial provide the general hydraulic performance test method of centrifugal pump, mixed flow pump and axial-flow pump for land, be a universal standard, can instruct the pump performance parameters (as flow, lift, air horsepower, efficiency and net positive suction head) to thering is intake line to measure and test.Because submersible pump does not have intake line, sucking gross head cannot measure, and this standard does not specifically provide the method for measurement of submersible pump net positive suction head.Another standard GB/T12785-2002 < < Submerged Motor Pumps test method > > does not provide the cavitation performance test method of submersible pump too, and other documents also find no open report.
Summary of the invention
The object of this invention is to provide a kind of closed test stand that can measure submersible pump net positive suction head, for the formulation of submersible pump product standard provides strong verification experimental verification, guarantee.
The technical solution adopted for the present invention to solve the technical problems is: submersible pump net positive suction head closed test stand is by cavitation pot, inlet valve, disloyalty diffusing tube, suction pipe, submersible pump, thermometer, inlet pressure table, transition tube, SEALING FITTING one, tachometer of measuring, delivery gauge, waste pipe, outlet pressure-measuring pipe, SEALING FITTING two, flowmeter upstream straight length, entrance pressure-measuring pipe, speed probe, flowmeter, flowmeter downstream straight length, flow control valve, water injection valve, vacuum pump, drain valve, exhaust tube, dividing plate, level meter, extraction valve, outlet valve has formed enclosed water-flow circuit, see Fig. 1.Inlet valve one end goes out head piece with cavitation pot and is connected by flange, the other end is connected with flange with disloyalty diffusing tube, the diffusion end of disloyalty diffusing tube and one end of suction pipe welding, the other end of suction pipe is connected with flange with one end of entrance pressure-measuring pipe, the entrance pressure-measuring pipe the other end is connected with flange with one end of transition tube, submersible pump outlet flange reinstalls by diffusing tube after being connected with the large flange of outlet pressure-measuring pipe, suction pipe, in the suction passage that entrance pressure-measuring pipe and transition tube form, and be connected with flange with transition tube, speed probe cable is drawn with tachometer of measuring and is connected by the SEALING FITTING one on the large flange of outlet pressure-measuring pipe, the feed cable of submersible pump is drawn by the SEALING FITTING two on the large flange of outlet pressure-measuring pipe, the little flange end of outlet pressure-measuring pipe is connected with flange with waste pipe, waste pipe is connected with flange with flowmeter upstream straight length, flowmeter upstream straight length, flowmeter, flowmeter downstream straight length, flow control valve and cavitation pot enter between head piece and all with flange, connect, outlet valve and extraction valve are equipped with in cavitation pot top, extraction valve is connected with vacuum pump by exhaust tube, bottom is provided with drain valve, intermediate portion is provided with water injection valve, outside is also provided with level meter, the head piece that goes out of cavitation pot is located at middle part, enter head piece and be located at below, in cavitation pot, entering head piece separates with dividing plate with going out between head piece.
The external diameter of the suction pipe of submersible pump net positive suction head closed test stand, entrance pressure-measuring pipe and transition tube is identical and be not less than 2.5 times of submersible pump external diameter, suction pipe length is not less than 12 times of its caliber, entrance pressure-measuring pipe length is its caliber 4 times, the caliber of outlet pressure-measuring pipe is identical with submersible pump outlet bore, export 4 times that pressure-measuring pipe length is its caliber, flowmeter and flowmeter upstream straight length and the same bore of flowmeter downstream straight length, flowmeter upstream flow development length is not less than 20 times of its caliber, and flowmeter downstream flow development length is not less than 5 times of its caliber.
The outside, entrance pressure-measuring pipe stage casing of submersible pump net positive suction head closed test stand is welded with entrance and all presses chamber, on entrance pressure-measuring pipe, symmetrical having is no less than 4 symmetrical entrance priming holes, thermometer and inlet pressure table are arranged on respectively the both sides that entrance is all pressed chamber, outlet pressure-measuring pipe stage casing is provided with equally outlet and all presses chamber, delivery gauge is arranged on the side that chamber is all pressed in outlet, sees Fig. 2, Fig. 3 and Fig. 4.
The thermometer of submersible pump net positive suction head closed test stand, inlet pressure table, delivery gauge, speed probe and tachometer of measuring and flowmeter are for measuring the key parameter of submersible pump net positive suction head.
The invention has the beneficial effects as follows: by submersible pump net positive suction head closed test stand, can measure the critical NPSH of submersible pump under different flow, solve the problem that the test of submersible pump cavitation performance can not be carried out.
Accompanying drawing explanation
Fig. 1 is submersible pump cavitation performance closed test stand schematic diagram, in figure, 1. cavitation pot, 2. go out head piece, 3. inlet valve, 4. disloyalty diffusing tube, 5. suction pipe, 6. submersible pump, 7. thermometer, 8. inlet pressure table, 9. transition tube, 10. SEALING FITTING one, 11. tachometer of measuring, 12. delivery gauges, 13. waste pipes, 14. outlet pressure-measuring pipes, 15. SEALING FITTING two, 16 flowmeter upstream straight lengths, 17. entrance pressure-measuring pipes, 18. speed probes, 19. flowmeters, 20. flowmeter downstream straight lengths, 21. flow control valves, 22. water injection valves, 23. vacuum pumps, 24. drain valves, 25. exhaust tubes, 26. enter head piece, 27. dividing plates, 28. level meters, 29. extraction valves, 30. outlet valves.
Fig. 2 is entrance pressure-measuring pipe 17 pressure-measuring point place sectional views; In figure, 31. entrances are all pressed chamber, 32. entrance priming holes.
Fig. 3 is the axial sectional view of entrance pressure-measuring pipe 17 pressure measurement place.
Fig. 4 is the axial sectional view of outlet pressure-measuring pipe 14 pressure measurement place; In figure, chamber is all pressed in 33. outlets, 34. outlet priming holes.
Fig. 5 is submersible pump net positive suction head curve.
Embodiment
Referring to Fig. 1, submersible pump net positive suction head closed test stand is by cavitation pot 1, go out head piece 2, inlet valve 3, disloyalty diffusing tube 4, suction pipe 5, submersible pump 6, thermometer 7, inlet pressure table 8, transition tube 9, SEALING FITTING 1, tachometer of measuring 11, delivery gauge 12, waste pipe 13, outlet pressure-measuring pipe 14, SEALING FITTING 2 15, flowmeter upstream straight length 16, entrance pressure-measuring pipe 17, speed probe 18, flowmeter 19, flowmeter downstream straight length 20, flow control valve 21, water injection valve 22, vacuum pump 23, drain valve 24, exhaust tube 25, dividing plate 27, level meter 28, extraction valve 29, outlet valve 30 forms.Inlet valve 3 one end with go out head piece 2 and be connected by flange, the other end is connected with disloyalty diffusing tube 4 use flanges, the diffusion end of disloyalty diffusing tube 4 and one end of suction pipe 5 welding, the other end of suction pipe 5 is connected with flange with one end of entrance pressure-measuring pipe 17, entrance pressure-measuring pipe 17 the other ends are connected with flange with one end of transition tube 9, align with submersible pump 6 first order impeller inlet limits in cross section, pressure-measuring point place in the middle of entrance pressure-measuring pipe 17, submersible pump 6 outlet(discharge) flanges reinstall by diffusing tube 4 after being connected with the large flange of outlet pressure-measuring pipe 14, suction pipe 5, in the suction passage that entrance pressure-measuring pipe 17 and transition tube 9 form, and be connected with transition tube 9 use flanges, speed probe 18 cables are drawn with tachometer of measuring 11 and are connected by the SEALING FITTING 1 on the large flange of outlet pressure-measuring pipe 14, the feed cable of submersible pump 6 is drawn by the SEALING FITTING 2 15 on the large flange of outlet pressure-measuring pipe 14, the little flange end of outlet pressure-measuring pipe 14 is connected with waste pipe 13 use flanges, between waste pipe 13, use elbow welding, waste pipe 13 is connected with flowmeter upstream straight length 16 use flanges, flowmeter upstream straight length 16, flowmeter 19, flowmeter downstream straight length 20, flow control valve 21 and entering between head piece 26 all connects with flange, outlet valve 30 and extraction valve 29 are equipped with in cavitation pot 1 top, extraction valve 29 is connected with vacuum pump 23 by exhaust tube 25, bottom is provided with drain valve 24, intermediate portion is provided with water injection valve 22, outside is also provided with level meter 28, go out head piece 2 and be located at middle part, enter head piece 26 and be located at below, enter head piece 26 and go out between head piece 2 to use dividing plate 27 to separate, suction pipe 5, the external diameter of entrance pressure-measuring pipe 17 and transition tube 9 is not less than 2.5 times of submersible pump 6 external diameters, suction pipe 4 length are not less than 12 times of its caliber, entrance pressure-measuring pipe 17 length are its caliber 4 times, the caliber of outlet pressure-measuring pipe 14 is identical with submersible pump 6 outlet bores, export 4 times that pressure-measuring pipe 13 length are its caliber, flowmeter 19 and flowmeter upstream straight length 16 and flowmeter downstream straight length 20 same bores, flowmeter upstream straight length 16 length are not less than 20 times of caliber, flowmeter downstream straight length 20 length are not less than 5 times of caliber.
Referring to Fig. 2, Fig. 3 and Fig. 4, entrance pressure-measuring pipe 17 outsides, stage casing are welded with entrance and all press chamber 31, symmetrically on entrance pressure-measuring pipe 17 have that to be no less than 4 symmetrical apertures be the entrance priming hole 32 of 3～6 millimeters, thermometer 7 and inlet pressure table 8 are arranged on respectively the both sides of all pressing chamber.Outlet pressure-measuring pipe 14 stage casings are provided with equally outlet and all press chamber 33, symmetrically on outlet pressure-measuring pipe 14 have that to be no less than 4 symmetrical apertures be the outlet priming hole 34 of 3～6 millimeters, and delivery gauge 12 is arranged on the side that chamber 33 is all pressed in outlet.
The process of the test of submersible pump net positive suction head: before cavitation experiment, close all valves except outlet valve 30 and water injection valve 22 on cavitation pot, open inlet valve 3 and flow control valve 21, clear water is injected to cavitation pot 1 by water injection valve 22, make water level account for tank high 4/5, close outlet valve 30, open extraction valve 29.
The first step of test, start submersible pump 6, adjust flux modulating valve 21, makes flow reach predetermined value, adjust flux modulating valve 21, make submersible pump 6 inlet pressures occur the negative pressure of a little, adjust flux modulating valve, makes flow keep predetermined value, running a period of time again, make submersible pump running stable, read the data on flowmeter 19, thermometer 7, inlet pressure table 8, delivery gauge 12, tachometer of measuring 11.
The second step of test, open vacuum pump 23, continue to extract the interior air of cavitation pot 1, tank level upward pressure is reduced, and then submersible pump 6 inlet pressures are further reduced, adjust flux modulating valve 21, makes flow keep predetermined value, close vacuum pump 23, read the data on flowmeter 19, thermometer 7, inlet pressure table 8, delivery gauge 12, tachometer of measuring 11; Repeat second step, obtain the 3rd group of data; So go on doing, when the single-stage lift of submersible pump 6 starts to occur declining, but also do not drop to single-stage lift 3% time, it is careful especially to need, until declining, submersible pump 6 single-stage lift surpass 3%, the submersible pump 6 single-stage lift critical NPSH NPSH3 that 3% corresponding net positive suction head value is submersible pump 6 that declines will make data point closeer near critical cavitation point.Regulate different flow predetermined values and keep in process of the test, can obtain the critical NPSH data of the submersible pump under different flow.
Finally, referring to Fig. 5, submersible pump 6 single-stage lift and net positive suction head are converted under rated speed, and take net positive suction head NPSH as abscissa, submersible pump 6 single-stage lift H are y coordinate, draw the submersible pump 6 cavitation performance curves under regulation flow.
Claims (3)
1. a submersible pump net positive suction head closed test stand, it is characterized in that: described submersible pump net positive suction head closed test stand is by cavitation pot (1), go out head piece (2), inlet valve (3), disloyalty diffusing tube (4), suction pipe (5), submersible pump (6), thermometer (7), inlet pressure table (8), transition tube (9), SEALING FITTING one (10), tachometer of measuring (11), delivery gauge (12), waste pipe (13), outlet pressure-measuring pipe (14), SEALING FITTING two (15), flowmeter upstream straight length (16), entrance pressure-measuring pipe (17), speed probe (18), flowmeter (19), flowmeter downstream straight length (20), flow control valve (21), water injection valve (22), vacuum pump (23), drain valve (24), exhaust tube (25), enter head piece (26), dividing plate (27), level meter (28), extraction valve (29), outlet valve (30) forms, described inlet valve (3) one end with described in go out head piece (2) and be connected by flange, the other end is connected with flange with described disloyalty diffusing tube (4), one end welding of the diffusion end of described disloyalty diffusing tube (4) and described suction pipe (5), the other end of described suction pipe (5) is connected with flange with one end of described entrance pressure-measuring pipe (17), described entrance pressure-measuring pipe (17) the other end is connected with flange with one end of described transition tube (9), described submersible pump (6) outlet(discharge) flange is connected with flange with described transition tube (9) after being connected with the large flange of described outlet pressure-measuring pipe (14) again, the feed cable of described speed probe (18) cable and described submersible pump (6) is drawn by described SEALING FITTING one (10) and described SEALING FITTING two (15) on the large flange of described outlet pressure-measuring pipe (14) respectively, the little flange end of described outlet pressure-measuring pipe (14) is connected with flange with described waste pipe (13), between described waste pipe (13), use elbow welding, described waste pipe (13) is connected with flange with described flowmeter upstream straight length (16), described flowmeter upstream straight length (16), described flowmeter (19), described flowmeter downstream straight length (20), described flow control valve (21) and described in enter between head piece (26) and all with flange, connect, outlet valve (30) and extraction valve (19) are equipped with in cavitation pot (1) top, extraction valve (19) is connected with vacuum pump (23) by exhaust tube (25), bottom is provided with drain valve (24), intermediate portion is provided with water injection valve (22), outside is also provided with level meter (28), the head piece (2) that goes out of cavitation pot (1) is located at middle part, enter head piece (26) and be located at below, in cavitation pot (1), enter head piece (2) and go out between head piece (26) to use dividing plate (27) to separate.
2. submersible pump net positive suction head closed test stand according to claim 1, it is characterized in that: described suction pipe (5), the external diameter of described entrance pressure-measuring pipe (17) and described transition tube (9) is identical and be not less than 2.5 times of described submersible pump (6) external diameter, described suction pipe (5) length is not less than 12 times of its caliber, described entrance pressure-measuring pipe (17) length is its caliber 4 times, the caliber of described outlet pressure-measuring pipe (14) is identical with described submersible pump (6) outlet bore, described outlet pressure-measuring pipe (14) length is its caliber 4 times, described flowmeter (19) and described flowmeter upstream straight length (16) and the same bore of described flowmeter downstream straight length (20), described flowmeter upstream straight length (16) length is not less than 20 times of its caliber, described flowmeter downstream straight length (20) length is not less than 5 times of its caliber.
3. submersible pump net positive suction head closed test stand according to claim 1, is characterized in that: described entrance pressure-measuring pipe (17) and outside, described outlet pressure-measuring pipe (14) stage casing are welded with entrance and all press chamber (31) and outlet pressure measuring cavity (33).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420128811.5U CN203742973U (en) | 2014-03-21 | 2014-03-21 | Closed testing device for net positive suction head of submerged pumps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420128811.5U CN203742973U (en) | 2014-03-21 | 2014-03-21 | Closed testing device for net positive suction head of submerged pumps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203742973U true CN203742973U (en) | 2014-07-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420128811.5U Withdrawn - After Issue CN203742973U (en) | 2014-03-21 | 2014-03-21 | Closed testing device for net positive suction head of submerged pumps |
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| Country | Link |
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| CN (1) | CN203742973U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103821710A (en) * | 2014-03-21 | 2014-05-28 | 江苏大学 | Closed test device for NPSH of submersible pump |
| CN104564643A (en) * | 2015-01-06 | 2015-04-29 | 江苏大学 | Immersed pump cavitation test bed |
-
2014
- 2014-03-21 CN CN201420128811.5U patent/CN203742973U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103821710A (en) * | 2014-03-21 | 2014-05-28 | 江苏大学 | Closed test device for NPSH of submersible pump |
| CN103821710B (en) * | 2014-03-21 | 2016-02-17 | 江苏大学 | Submersible pump net positive suction head closed test stand |
| CN104564643A (en) * | 2015-01-06 | 2015-04-29 | 江苏大学 | Immersed pump cavitation test bed |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140730 Effective date of abandoning: 20160217 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |