CN104568021A - Three-screw-rod flow meter - Google Patents
Three-screw-rod flow meter Download PDFInfo
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- CN104568021A CN104568021A CN201510073993.XA CN201510073993A CN104568021A CN 104568021 A CN104568021 A CN 104568021A CN 201510073993 A CN201510073993 A CN 201510073993A CN 104568021 A CN104568021 A CN 104568021A
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Abstract
The invention relates to a three-screw-rod flow meter. The three-screw-rod flow meter consists of a driving screw rod, two driven screw rods and a shell, wherein the driving screw rod is positioned in a mounting hole in the middle of the shell, the two driven screw rods are symmetrically distributed in the mounting holes in two sides of the shell, the driving screw rod is in meshed connection with the two driven screw rods, and the driving screw rod, the driven screw rods and the corresponding mounting holes in the shell are in clearance fit to form a sealed cavity. The three-screw-rod flow meter disclosed by the invention is extremely small in pulsation rate and uniform in axial flow, and is very suitable for being applied to measurement places which do not allow liquid agitation and rotation; by adopting the three-screw-rod flow meter, the problem of sharp pressure drop can be solved; the three-screw-rod flow meter is extremely low in vibration noise, cannot cause influences to other equipment of system operation, and ensures that use requirements of severe environments for land use, marine use, aviation and the like can be met; the three-screw-rod flow meter is very high in precision, also is good in measurement repeatability, and can be taken as a standard laboratory calibration instrument for calibrating other flow meters; and the flow meter has the highest cost performance of outline dimensions and weights compared with all other flow meters.
Description
Technical field
The present invention relates to a kind of flowmeter, especially a kind of three screw rod flowmeters being applicable to the flow measurement of the liquid of the various viscosity with lubricating property.
Background technology
At present, flowmeter mainly contains oval gear flowmeter, rotz flowmeter, blade flowmeter etc.
A pair intermeshing elliptic gear that oval gear flowmeter major part is housing and loads in housing, constitutes an enclosed fluid metric space with cover plate.Under the effect of inlet outlet pressure differential, elliptic gear is subject to moment loading and rotates.Change of Fluid Viscosity can cause the change of leakage rate between import and export, and leaking senior general affects measuring accuracy.
Rotz flowmeter is also known as Roots type flowmeter, and the similar oval gear flowmeter of metering process, is realized by the fixing metric space formed between waist wheel rotor and housing.Waist wheel turns over a circle, discharges the liquid of four fixing metered volume, and the lower waist wheel of meter rotates revolution, just can obtain the volumetric flow rate of detected fluid.The rotation of waist wheel relies on fluid inlet and outlet pressure reduction to realize equally.Rotz flowmeter increases along with flow, and rotor velocity wave phenomenon is comparatively serious, flow pulse rate about about 22%.
Blade flowmeter have in measuring chamber two to or the rotatable scraper plate of three teams, radially slide at the groove inside strake of rotor cylinder, drive lower scraping plate and rotor to rotate at inlet outlet pressure differential.Fluid is continuously divided into single volume by scraper plate, then utilizes driven wheel and counting indicator mechanism to measure fluid total volume.Blade flowmeter is suitable for the fluid of viscosity higher, and Change of Fluid Viscosity is less on indicating value impact.Flowmeter on-the-spotly can show integrated flux, and has teletransmission output interface, supports the use, can carry out remote measurement, display and control with corresponding photo-electric pulse converter and flow integrator.Compared with rotz flowmeter, have and run pulse free and the little advantage of noise, but metering precision is high not as waist wheel, generally accomplishes ± 1%.
There is subject matter in above-mentioned three kinds of flowmeters:
1) pulsation rate is large;
2) vibration noise is large;
3) flow range is little;
4) precision is low;
5) physical dimension and weight large.
Although the duplex rotor meter of development in recent years substantially overcomes above-mentioned shortcoming, three screw rod flowmeters have more advantage in pulsation rate, vibration noise, physical dimension and weight, also lower on production cost.
Summary of the invention
The present invention will provide a kind of three screw rod flowmeters, and this flowmeter adopts screw rod engagement technology, the advantage such as have that pulsation rate is minimum, vibration noise is very low, physical dimension is little, lightweight and production cost is low.
For achieving the above object, technical scheme of the present invention is: a kind of three screw rod flowmeters, by one, initiatively screw rod, two driven screw and housing form, described active screw rod is placed in the mounting hole in the middle of housing, two driven screw are arranged symmetrically in the mounting hole on housing both sides, initiatively screw rod and two driven screw are connected with a joggle, and initiatively screw rod, driven screw form annular seal space with the interior corresponding mounting hole clearance fit of housing.
Initiatively the molded line of screw rod, driven screw is combined cycloid.Speed pickup and temperature sensor housing be equipped with, speed pickup and temperature sensor are arranged on the two ends of housing respectively, for screw rod rotating cycle and medium temperature are transformed into electric signal, be presented at after teletransmission, computing on Displaying Meter, on-line monitoring and accurate measurement.In housing, forward and backward two ends are provided with forward and backward chamber, and forward and backward chamber arranges filter screen respectively, for stoping larger particles to enter in flowmeter, cause damage to the engagement of screw rod.When initiatively screw rod, driven screw rotate, each flow section perpendicular to screw axis amasss in each anglec of rotation identical.
Beneficial effect of the present invention:
1, theoretical pulsation rate is zero, and actual pulsation rate is minimum; Axia flow is even, is very suitable for not allowing the metering occasion that aqueous agitation and rotation occur to use; Overcome pressure and suddenly fall problem.
2, vibration noise is extremely low, does not have an impact to other equipment of system cloud gray model, meets the request for utilization under the severe rugged environments such as land, peculiar to vessel and aviation.
3, precision is very high, and measuring repeatability is good, can make code test room prover, to calibrate other flowmeters.
4, physical dimension and weight are that in all flowmeters, cost performance is the highest.
Although 5 screw rod processing technologys are complicated, high to processing request, the enterprise that can produce screw pump and screw motor also can produce three screw rod flowmeters, and therefore production cost is lower.
Three screw rod flowmeters of the present invention are highly suitable for the flow measurement of the liquid of the various viscosity with lubricating property, select machinery metering gauge outfit to realize showing on the spot, and can be equipped with pulse signalling generator or intelligent meter realizes teletransmission; Full accuracy grade can reach 0.1, and keeps split-second precision long; Structure is simple, lightweight; The pressure loss is little, is maximumly no more than 0.03MPa; Easy for installation, do not need the auxiliary device such as straight length, rectifier, not by the impact of the pipe fitting such as elbow, valve; Operate steadily, vibration & noise is very little.Be highly suitable for the ship environment use that volume of compartment is narrow and small, space is narrow, have higher requirements to vibration noise, physical dimension and weight, and production cost is lower, there is very important market economy and be worth.
Accompanying drawing explanation
Fig. 1 is structure cut-open view of the present invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the cut-open view of bowing of Fig. 1;
Fig. 4 is the cut-open view along A-A in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As shown in Figures 1 to 4, a kind of three screw rod flowmeters, primarily of housing 1, initiatively screw rod 3, first and second driven screw 2,4 composition.Initiatively screw rod 3 and first and second driven screw 2,4 spiral surface are particular design, form totally-enclosed chamber, front chamber 21, rear chamber 22 are strictly separated with three holes in housing 1.When initiatively screw rod 3, first and second driven screw 2,4 rotate, each flow section perpendicular to screw axis amasss in each anglec of rotation identical, therefore its often to turn discharge capacity identical, the theoretical delivery pulsation rate of three screw rod flowmeters is zero.
Initiatively screw rod 3 is very little with first and second driven screw 2,4 diameter, and its moment of inertia is very little, and the profile of particular design can realize the very light lead-screw of liquid and rotate, and namely, the pressure reduction of chamber is very little.
First filter screen 5, second filter screen 6 being set respectively in front chamber 21, rear chamber 22, for stoping larger particles to enter in flowmeter, damage being caused to the engagement of screw rod.
Front end end cover 8, rear end cap 11 connect fastening with housing 1 by screw 7.Initiatively screw rod 3 is inserted in stop collar 9, bearing 19 and shaft block ring 18, is used for first and second driven screw 2,4 of axial restraint, and bearing 19 is fixed on locating flange 10 by bearing gland 19 and screw 16.
As shown in Figure 2, housing 1 symmetria bilateralis has threaded hole, and side dress speed pickup 12, temperature sensor 13, opposite side seals for subsequent use by the first plug screw 14 and the second plug screw 15.
Speed pickup 12, temperature sensor 13 are arranged on the two ends of housing 1 respectively, for screw rod rotating cycle and medium temperature are transformed into electric signal, are presented on Displaying Meter after teletransmission, computing, for on-line monitoring and accurate measurement.
Three screw rod flowmeters are primarily of active screw rod, a two driven screw and housing composition, and centre is active screw rod, and both sides are the driven screw be arranged symmetrically with, and housing have the hole corresponding with its three screw rods.Initiatively screw rod, driven screw molded line adopt combined cycloid, and screw meshing pair and the hole of housing are that small―gap suture coordinates, and form strict annular seal space, flowmeter is passed in and out oral cavity and strictly separates.Three holes of housing again as unique transverse bearing of three screw rods, without the need to installing external support bearing additional to screw rod.Because whole driven screw is by the support in hole, so screw rod does not just have the effect of bending load.Driven screw is arranged symmetrically with, and all screw rods are all double-helical structures, so initiatively screw rod also not load effect by bending.Therefore, the structure of this studdle is that this asynchronous screw rod engages unique feature.
Liquid in three screw rod flowmeters is along screw axial dispatch, and this liquid be different from every other spinner-type flowmeter (comprising duplex rotor meter) all exists the phenomenon of circumferentially movement.Along the advantage of screw axial dispatch, make three screw rod flowmeter axia flow even, be very suitable for not allowing the metering occasion that aqueous agitation and rotation occur to use.Three screw rod flowmeters all can be measured any installation site, and horizontal direction or vertical direction, even two-way flow can accurately be measured.
The flow area of the screw rod overflowing end face of three screw rod flowmeters is all identical, and therefore its theoretical pulsation rate is zero, smooth movement, sensitive, insensitive to mechanical vibration, adapts to stream of pulses rapid fluctuations, is applicable to the metering of stream of pulses.
Three screw rod flowmeters drive by actuating medium, and the oil product being applicable to various viscosity is measured, and flow range is wide in range, and without the need to straight length.Because bolt rotary inertia is very little, so it can when discharge capacity difference be little, with the rotation speed operation higher than other spinner-type flowmeters.
Three screw rod flowmeters can be competent at accurate measurement and the precise monitoring of diesel engine, oil burning boiler fuel consume on boats and ships and train head.Three screw rod flowmeters are insensitive to runner disturbance.Do not need flow conditioner; Valve and pipe can allow to be close to flowmeter; This allows the easy installation in tight space.Three screw rod flowmeters can be equipped with multiple interfaces, and as pipe thread, inch screw thread, metric thread or flange-interface, or user specifies.Three screw rod flowmeter accuracy are very high, can reach ± 0.1%; By arranging speed pickup and viscosity sensor, accurate measurement can be realized after teletransmission to secondary instrument process, can mass flow measurement be realized; And measuring repeatability is high; May be used for code test room, make flow verification instrument to verify other flowmeters.Compared with duplex rotor meter, its volume is less, weight is lighter, and processing cost is lower, is more suitable for for cabin harsh environment, sturdy durable.
Three screw rod flowmeters are a performance range wide spectrums, vibration noise is low, precision is high, reproducible, physical dimension is little, lightweight, installation requirement is low, safeguard simple traffic tester.Three screw rod flowmeters are well suited for modular design, with speed probe, temperature sensor simple combination, can realize the signal is far passed and display display.
Claims (5)
1. a screw rod flowmeter, by one, initiatively screw rod (3), two driven screw and housing (1) form, it is characterized in that: described active screw rod (3) is placed in the mounting hole in the middle of housing (1), two driven screw are arranged symmetrically in the mounting hole on housing (1) both sides, initiatively screw rod (3) and two driven screw are connected with a joggle, and initiatively screw rod (3), driven screw form annular seal space with the interior corresponding mounting hole clearance fit of housing (1).
2. three screw rod flowmeters according to claim 1, is characterized in that: the molded line of described active screw rod (3), driven screw is combined cycloid.
3. three screw rod flowmeters according to claim 1, it is characterized in that: described housing (1) is equipped with speed pickup (12) and temperature sensor (13), speed pickup (12) and temperature sensor (13) are arranged on the two ends of housing (1) respectively, for screw rod rotating cycle and medium temperature are transformed into electric signal, be presented at after teletransmission, computing on Displaying Meter, on-line monitoring and accurate measurement.
4. three screw rod flowmeters according to claim 1, is characterized in that: in described housing (1), forward and backward two ends are provided with forward and backward chamber (21,22), forward and backward chamber (21,22) filter screen being set respectively, for stoping larger particles to enter in flowmeter, damage being caused to the engagement of screw rod.
5. three screw rod flowmeters according to claim 1, is characterized in that: when described active screw rod (3), driven screw rotate, each flow section perpendicular to screw axis amasss in each anglec of rotation identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510073993.XA CN104568021A (en) | 2015-02-12 | 2015-02-12 | Three-screw-rod flow meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510073993.XA CN104568021A (en) | 2015-02-12 | 2015-02-12 | Three-screw-rod flow meter |
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| Publication Number | Publication Date |
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| CN104568021A true CN104568021A (en) | 2015-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510073993.XA Pending CN104568021A (en) | 2015-02-12 | 2015-02-12 | Three-screw-rod flow meter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478806A (en) * | 2017-08-31 | 2017-12-15 | 贵州师范大学 | A kind of karst underground sediment monitoring and reception device |
| CN112729423A (en) * | 2020-12-22 | 2021-04-30 | 金迈思液压设备（天津）有限公司 | Double-screw rotor flow meter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4208869A1 (en) * | 1992-03-19 | 1993-09-23 | Leistritz Ag | Volumetric fuel flowmeter - has displacement meter consisting of engaged, threaded screw spindles, inductive electromagnetic sensors close to grooves in one spindle |
| CN1365420A (en) * | 1999-03-31 | 2002-08-21 | 微动公司 | Helical rotor structure for fluid displacement apparatus |
| CN2644710Y (en) * | 2003-07-16 | 2004-09-29 | 天津泵业机械集团有限公司 | Horizontal type high pressure high volume three-screw pump |
| DE19513781B4 (en) * | 1994-05-05 | 2005-01-20 | Kräutler Ges.m.b.H. & Co. | Device for volume measurement of flowing media |
| CN201851354U (en) * | 2010-10-13 | 2011-06-01 | 天津泵业机械集团有限公司 | Vertical three-screw pump |
| CN102341681A (en) * | 2008-08-25 | 2012-02-01 | 株式会社奥巴尔 | Axial flow positive displacement flowmeter |
-
2015
- 2015-02-12 CN CN201510073993.XA patent/CN104568021A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4208869A1 (en) * | 1992-03-19 | 1993-09-23 | Leistritz Ag | Volumetric fuel flowmeter - has displacement meter consisting of engaged, threaded screw spindles, inductive electromagnetic sensors close to grooves in one spindle |
| DE19513781B4 (en) * | 1994-05-05 | 2005-01-20 | Kräutler Ges.m.b.H. & Co. | Device for volume measurement of flowing media |
| CN1365420A (en) * | 1999-03-31 | 2002-08-21 | 微动公司 | Helical rotor structure for fluid displacement apparatus |
| CN2644710Y (en) * | 2003-07-16 | 2004-09-29 | 天津泵业机械集团有限公司 | Horizontal type high pressure high volume three-screw pump |
| CN102341681A (en) * | 2008-08-25 | 2012-02-01 | 株式会社奥巴尔 | Axial flow positive displacement flowmeter |
| CN201851354U (en) * | 2010-10-13 | 2011-06-01 | 天津泵业机械集团有限公司 | Vertical three-screw pump |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478806A (en) * | 2017-08-31 | 2017-12-15 | 贵州师范大学 | A kind of karst underground sediment monitoring and reception device |
| CN112729423A (en) * | 2020-12-22 | 2021-04-30 | 金迈思液压设备（天津）有限公司 | Double-screw rotor flow meter |
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Application publication date: 20150429 |
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