CN204025064U - With the high-efficiency vertical axial-flow pump device of pilot blade flow measurement - Google Patents
With the high-efficiency vertical axial-flow pump device of pilot blade flow measurement Download PDFInfo
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- CN204025064U CN204025064U CN201420449465.0U CN201420449465U CN204025064U CN 204025064 U CN204025064 U CN 204025064U CN 201420449465 U CN201420449465 U CN 201420449465U CN 204025064 U CN204025064 U CN 204025064U
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- umbrella shape
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Abstract
With the high-efficiency vertical axial-flow pump device of pilot blade flow measurement, belong to pump-unit technical field.Comprise the water inlet flow channel, pilot blade current surveying device, impeller, diffuser, the outlet passage that connect are installed successively, outlet passage is symmetrical umbrella shape scroll casing type outlet passage, symmetrical umbrella shape scroll casing type outlet passage comprises umbrella shape diffusing tube, water guide cone, ω shape rear wall and water outlet box culvert, water guide cone and umbrella shape diffusing tube, ω shape rear wall form symmetrical umbrella shape worm frame, and symmetrical umbrella shape spiral case is smoothly connected into entirety with box culvert.The utility model mechanism is rationally simple, adopt pilot blade current surveying device to be fixedly installed in bell water inlet flow channel outlet, these flow measurement parts are also as axial-flow pump pilot blade, can improve the water pump fluidised form that becomes a mandarin, and adopt symmetrical umbrella shape scroll casing type outlet passage, diffusing tube after diffuser is changed and is made as umbrella shape spiral case, box culvert and umbrella shape spiral case are smoothly connected, and form monolithic construction, and current are for going out in a organized way stream, reduce hydraulic loss, improved unit efficiency.
Description
Technical field
The utility model relates to a kind of fluid dynamic machinery device with flow measurement function, especially the vertical axial-flow pump-unit with pilot blade flow measurement, it combines the pump technology in fluid machinery and fluid flux measurement technology, be specially adapted to the large and medium-sized vertical axial-flow pumping plant engineering of drawing water, belong to pump-unit technical field.
Background technique
Vertical shaft type axial-flow pump device is the main pattern of low lift large pumping station, is mainly connected to form by installations such as water inlet flow channel, impeller, stator, diffusing tube, outlet passages.Domestic built more than 300 low lift large pumping stations adopt this pattern more.Low lift large-sized vertical-type axial-flow pump device has elbow-hydrocone type, elbow-straighttube-type, bell-straighttube-type and bell-box culvert-type.The advantages such as that bell-box culvert-type has is simple in structure, installation and repairing convenient, axial dimension is short are used widely in low lift large pumping station.The hydraulic loss of low lift large pumping station outlet passage is the principal element that affects efficiency of pumping station, the structural type that existing bell-box culvert-type pump-unit water part adopts diffuser-diffusing tube to separate with box culvert, diffuser-diffusing tube is directly placed in casing, seriously blocks water, and affects unit efficiency.The flow measurement of bell-box culvert-type magna pump device is the technical barrier in engineering always.The flow measurement of Large Axial Flow Pump once adopted salt solution method, water inlet flow channel differential pressure measurement method, multiple spot current meter flow measurement and five-hole probe flow measurement method, and ultrasonic flowmeter also has application in large pumping station flow measurement in recent years.Salt solution method last century the seventies once had employing, because its complicated operation, cost are high, low precision, now superseded; There is the problem that pressure reduction poor stability, data reliability are not high in water inlet flow channel differential pressure measurement method, thereby effect is not good; Multiple spot current meter flow measurement and five-hole probe flow measurement method exist that surveying work amount is large, operating difficulties, data collection cycle is long and can not carry out the online shortcoming detecting as retainer instrument equipment, thereby use and be restricted; Ultrasonic flowmeter is owing to cannot being installed in water-in and water-out runner and water plug, can only in inlet channel flow section, measure point by point, more cumulative, thereby have that workload is large, cost is high and the shortcoming such as precision is lower.
Model utility content
The purpose of this utility model be for existing bell-box culvert-type magna pump device above shortcomings, a kind of water part good integrity is provided and there is the high-efficiency vertical axial-flow pump device with pilot blade flow measurement of flow measurement function.
The purpose of this utility model is such, with the high-efficiency vertical axial-flow pump device of pilot blade flow measurement, comprise the water inlet flow channel, pilot blade current surveying device, impeller, diffuser, the outlet passage that connect are installed successively, it is characterized in that, described outlet passage is symmetrical umbrella shape scroll casing type outlet passage, symmetrical umbrella shape scroll casing type outlet passage comprises umbrella shape diffusing tube, water guide cone, ω shape rear wall and water outlet box culvert, water guide cone and umbrella shape diffusing tube, ω shape rear wall form symmetrical umbrella shape worm frame, and symmetrical umbrella shape spiral case is smoothly connected into entirety with box culvert.
Described water inlet flow channel is bell water inlet flow channel, and described pilot blade current surveying device is fixedly installed in bell water inlet flow channel outlet.
The tube wall of described umbrella shape diffusing tube is made up of with straight line descending branch oval section, oval section is respectively with diffuser with straight line descending branch is tangent is connected, descending branch and level inclination are 45 °～60 °, described oval section is connected to form by oval metal segments and oval concrete segment, and oval concrete segment and described straight line descending branch are by the moulding of concrete one-time-concreting.
Described pilot blade current surveying device is made up of flow measurement blade and ring seat, wheel hub, 4 flow measurement blades are arranged symmetrically between ring seat and wheel hub, every flow measurement blade is provided with dynamic and static pressure pressure tap, dynamic pressure pressure tap is just to water (flow) direction, static pressure pressure tap is arranged on flow measurement blade side, every flow measurement blade is provided with 5 pairs of dynamic and static pressure pressure taps, and the dynamic and static pressure pressure tap of 5 couple on 4 flow measurement blades is identical respectively with the distance of described wheel hub.
The utility model mechanism is rationally simple, adopt pilot blade current surveying device to be fixedly installed in bell water inlet flow channel outlet, these flow measurement parts are also as axial-flow pump pilot blade, can improve the water pump fluidised form that becomes a mandarin, and adopt symmetrical umbrella shape scroll casing type outlet passage, diffusing tube after diffuser is changed and is made as umbrella shape spiral case, box culvert and umbrella shape spiral case are smoothly connected, and form monolithic construction, and current are for going out in a organized way stream, reduce hydraulic loss, improved unit efficiency.
Pilot blade current surveying device is a kind of flow measuring device with highi degree of accuracy, strong adaptability, low cost, multi-functional, fixed installation feature based on fluid Bernoulli's equation and blade lattice streaming principle, can realize the real-time automatic measuring of Flow Measuring System.
Pilot blade current surveying device adopts 4 flow measurement blades that are arranged symmetrically with, every blade to lay the structural type of 5 pairs of sound pressure taps, is fixedly installed in water inlet flow channel outlet.Adopt Theories of Cascades analysis and flume test research to obtain flow measurement vane airfoil profile, according to the water inlet flow channel exit flow field regularity of distribution, determine that dynamic pressure sampling location and current separation point are static pressure sampling location, the principles of flow such as foundation, divide overcurrent ring width, determine pressure-measuring point spacing and position on flow measurement blade.According to the pressure differential deltap p between the pitot aperture to water (flow) direction and side baroport just, see formula (1), calculate flow rate of water flow V, can obtain accordingly 4 velocity distribution on flow measurement blade, the mean velocity using 4 flow velocity mean values in same radius as this pressure tap place overcurrent ring
calculate the flow of 5 overcurrent rings, add up and be total discharge Q, see formula (2).
Pilot blade current surveying device under steady working condition with water inlet flow channel, water pump Matching installation, after high-accuracy water pump testing bench teat is tested calibrating and coefficient correction, precision reaches 0.5～1%, can meet the requirement of big-and-middle-sized pumping plant situ flow measurement accuracy of measurement.Flow measurement calibrating correction formula is:
In formula: α
ifor correction factor.
The structural type that existing bell-box culvert-type pump-unit water part adopts diffuser-diffusing tube to separate with box culvert, diffuser-diffusing tube is directly placed in casing, seriously blocks water, and affects unit efficiency.The utility model adopts symmetrical umbrella shape scroll casing type outlet passage, and diffusing tube after diffuser is changed and is made as umbrella shape spiral case, and box culvert and umbrella shape spiral case are smoothly connected, and forms monolithic construction, and current, for going out in a organized way stream, reduce hydraulic loss, have improved unit efficiency.
The outstanding advantage of pilot blade current surveying device is: 1. precision.Pilot blade current surveying device has theoretical foundation technically, meets fluid mechanics principle, data stabilization, and 0.5 grade of measuring accuracy, meets large pumping station engine request.2. low cost.Flow measurement pilot blade structure is uncomplicated, be easy to manufacture, with low cost.3. permanence, immobilization.Flow measurement pilot blade is installed on permanent, fixing parts that become water pump in pumping plant, and durable in use, makes water plug have flow measurement function of measuring.4. multi-functional.The utility model device is except realizing the measurement of conventional flow, mean velocity in section or some flow velocity, and can obtain measuring the Important Parameters such as velocity flow profile, pressure distribution of section.5. real time implementation, in linearize.The utility model current surveying device can be in real time, detection of dynamic flow can be by the running state of conversion, Displaying Meter monitoring water pump assembly, or by network show in real time at central control room, record.6. automation, intellectuality.The utility model current surveying device combines with automatic technology, computer technology, artificial intelligence technology, can realize telecontrol, Automatic dispatching, the optimization operation of pumping station operation management.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is symmetrical umbrella shape scroll casing type outlet passage schematic diagram of the present utility model, and (1) is plan view, and (2) are plan view.
Fig. 3 is the structural representation of pilot blade current surveying device of the present utility model, and (1) is plan view, and (2) are left view.
Fig. 4 is the vane airfoil profile sectional schematic diagram of flow measurement stator of the present utility model.
Fig. 5 is symmetrical umbrella shape scroll casing type outlet passage application implementation schematic diagram of the present utility model.
In figure: symmetrical umbrella shape spiral case 1, impeller 2, diffuser 3, bell water inlet flow channel 4, pilot blade current surveying device 5, umbrella shape diffusing tube 6, water guide cone 7, ω shape rear wall 8, water outlet box culvert 9, flow measurement blade 10, wheel hub 11, ring seat 12, dynamic pressure pressure tap 13, static pressure pressure tap 14, semi-circle 15, straightway 16, oval segmental arc 17, elliptical center 18, center line 19, oval metal segments 20, oval concrete segment 21, straight line descending branch 22.
Embodiment
As Figure 1-Figure 5, with the high-efficiency vertical axial-flow pump device of pilot blade flow measurement, formed by water inlet flow channel, pilot blade current surveying device, impeller, diffuser, outlet passage that connection is installed successively etc., pilot blade current surveying device is arranged on water inlet flow channel outlet, pilot blade current surveying device is made up of flow measurement blade and ring seat, wheel hub, 4 flow measurement blades are arranged symmetrically between ring seat and wheel hub, every flow measurement blade is provided with dynamic and static pressure pressure tap, dynamic pressure pressure tap is just to water (flow) direction, and static pressure pressure tap is arranged on flow measurement blade side.Water inlet flow channel is bell water inlet flow channel, and described current surveying device is fixedly installed in bell water inlet flow channel outlet.Described outlet passage is symmetrical umbrella shape scroll casing type outlet passage, symmetrical umbrella shape scroll casing type outlet passage comprises umbrella shape diffusing tube 6, water guide cone 7, ω shape rear wall 8 and water outlet box culvert 9, water guide cone and umbrella shape diffusing tube, ω shape rear wall form symmetrical umbrella shape worm frame, and symmetrical umbrella shape spiral case is smoothly connected into entirety with box culvert.The tube wall of described umbrella shape diffusing tube 6 is made up of with straight line descending branch oval section, oval section is respectively with diffuser 3 with straight line descending branch 22 is tangent is connected, descending branch and level inclination are 45 °～60 °, described oval section is connected to form by oval metal segments 20 and oval concrete segment 21, and oval concrete segment 21 and described straight line descending branch 22 are by the moulding of concrete one-time-concreting.On every flow measurement blade, establishing dynamic and static pressure pressure tap is 5 pairs, and the dynamic and static pressure pressure tap of 5 couple on 4 flow measurement blades is symmetrical respectively.
As shown in Figure 2, the water guide cone 7 of symmetrical umbrella shape scroll casing type outlet passage, ω shape rear wall 8 and water outlet box culvert 9 can adopt in engineering ripe mathematical expression and design method, construction technology.Umbrella shape diffusing tube 6 be oval section+straight line descending branch, oval section is tangent with diffuser 3 and straight line descending branch 22 respectively, straight line descending branch and level inclination are 45 °～60 °.For the ease of the water pump installation and repairing of loosing core, in enforcement, oval section should be divided into metal segments 20 and concrete segment 21.Specific embodiments as shown in Figure 5.
As shown in Figure 1, pilot blade current surveying device is installed in bell water inlet flow channel 4 and exports, and does not change the original component structural of magna pump device.This current surveying device can be manufactured by figure by producer, when on-the-spot installation, as separate part and the supporting installation of water pump assembly.To built large pumping station, available flow measurement guide vane device changed former pilot blade.
As shown in Figure 3, Figure 4, the working principle of pilot blade current surveying device is the sound pressure reduction flow measurement that utilizes blade lattice streaming to produce, be specially: according to the pressure differential deltap p between the kinetic pressure sampled point 13 to water (flow) direction and side static pressure sampled point 14 just, see formula (1), calculate flow rate of water flow V, can obtain accordingly 4 velocity distribution on flow measurement blade, the mean velocity using 4 flow velocity mean values in same radius as this pressure tap place overcurrent ring
calculate the flow of 5 overcurrent rings, add up and be total discharge Q, see formula (2).
In formula: α
ifor calibrating correction factor.
Claims (4)
1. the high-efficiency vertical axial-flow pump device with pilot blade flow measurement, comprise the water inlet flow channel, pilot blade current surveying device, impeller, diffuser, the outlet passage that connect are installed successively, it is characterized in that, described outlet passage is symmetrical umbrella shape scroll casing type outlet passage, symmetrical umbrella shape scroll casing type outlet passage comprises umbrella shape diffusing tube, water guide cone, ω shape rear wall and water outlet box culvert, water guide cone and umbrella shape diffusing tube, ω shape rear wall form symmetrical umbrella shape worm frame, and symmetrical umbrella shape spiral case is smoothly connected into entirety with box culvert.
2. the high-efficiency vertical axial-flow pump device with pilot blade flow measurement according to claim 1, is characterized in that, described water inlet flow channel is bell water inlet flow channel, and described pilot blade current surveying device is fixedly installed in bell water inlet flow channel outlet.
3. the high-efficiency vertical axial-flow pump device with pilot blade flow measurement according to claim 1, it is characterized in that, the tube wall of described umbrella shape diffusing tube is made up of with straight line descending branch oval section, oval section is respectively with diffuser with straight line descending branch is tangent is connected, descending branch and level inclination are 45o ~ 60o, described oval section is connected to form by oval metal segments and oval concrete segment, and oval concrete segment and described straight line descending branch are by the moulding of concrete one-time-concreting.
4. the high-efficiency vertical axial-flow pump device with pilot blade flow measurement according to claim 1, it is characterized in that, described pilot blade current surveying device is made up of flow measurement blade and ring seat, wheel hub, 4 flow measurement blades are arranged symmetrically between ring seat and wheel hub, every flow measurement blade is provided with dynamic and static pressure pressure tap, dynamic pressure pressure tap is just to water (flow) direction, static pressure pressure tap is arranged on flow measurement blade side, every flow measurement blade is provided with 5 pairs of dynamic and static pressure pressure taps, and the dynamic and static pressure pressure tap of 5 couple on 4 flow measurement blades is identical respectively with the distance of described wheel hub.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420449465.0U CN204025064U (en) | 2014-08-08 | 2014-08-08 | With the high-efficiency vertical axial-flow pump device of pilot blade flow measurement |
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| CN201420449465.0U CN204025064U (en) | 2014-08-08 | 2014-08-08 | With the high-efficiency vertical axial-flow pump device of pilot blade flow measurement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104595239A (en) * | 2015-01-21 | 2015-05-06 | 扬州大学 | Series of inclined water outlet flow passages with excellent hydraulic performance and application method thereof |
| CN106640719A (en) * | 2016-11-15 | 2017-05-10 | 上海电气电站设备有限公司 | Testing device and method for flow of multistage axial-flow fan of turbine generator |
| CN116044815A (en) * | 2023-01-20 | 2023-05-02 | 江苏大学 | Suction chamber for improving cavitation performance of condensate pump |
-
2014
- 2014-08-08 CN CN201420449465.0U patent/CN204025064U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104595239A (en) * | 2015-01-21 | 2015-05-06 | 扬州大学 | Series of inclined water outlet flow passages with excellent hydraulic performance and application method thereof |
| CN104595239B (en) * | 2015-01-21 | 2015-11-25 | 扬州大学 | The serial inclined outlet passage of hydraulic performance excellence and application process thereof |
| CN106640719A (en) * | 2016-11-15 | 2017-05-10 | 上海电气电站设备有限公司 | Testing device and method for flow of multistage axial-flow fan of turbine generator |
| CN116044815A (en) * | 2023-01-20 | 2023-05-02 | 江苏大学 | Suction chamber for improving cavitation performance of condensate pump |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141217 Termination date: 20170808 |
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| CF01 | Termination of patent right due to non-payment of annual fee |