CN101881639A - V-cone flow meter and use method thereof - Google Patents

V-cone flow meter and use method thereof Download PDF

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Publication number
CN101881639A
CN101881639A CN 201010210624 CN201010210624A CN101881639A CN 101881639 A CN101881639 A CN 101881639A CN 201010210624 CN201010210624 CN 201010210624 CN 201010210624 A CN201010210624 A CN 201010210624A CN 101881639 A CN101881639 A CN 101881639A
Authority
CN
China
Prior art keywords
pressure guiding
negative pressure
guiding pipe
type cone
measuring tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN 201010210624
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Chinese (zh)
Inventor
邹莲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JIANGYIN THROTTLING DEVICE MANUFACTURER CO Ltd
Original Assignee
JIANGYIN THROTTLING DEVICE MANUFACTURER CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by JIANGYIN THROTTLING DEVICE MANUFACTURER CO Ltd filed Critical JIANGYIN THROTTLING DEVICE MANUFACTURER CO Ltd
Priority to CN 201010210624 priority Critical patent/CN101881639A/en
Publication of CN101881639A publication Critical patent/CN101881639A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a V-cone flow meter and a use method thereof. The V-cone flow meter comprises a measuring tube, a positive pressure guiding tube and a negative pressure guiding, and a bearing pressure guiding tube vertically arranged on the measuring tube, wherein the positive pressure guiding tube and the negative pressure guiding tube are arranged on the measuring tube; the upper end of the bearing pressure guiding tube is connected with the negative pressure guiding tube; a V-shaped conic body is arranged in the measuring tube, and is a sealed hollow structure; the front end of the V-shaped conic body is an incident flow body end, and the rear end is provided with a rear cover of the V-shaped conic body, wherein the rear cover penetrates and extends outside the front and the rear ends of the V-shaped conic body; one central negative pressure guiding tube is fixedly arranged in the V-shaped conic body; the incident flow body end of the central negative pressure guiding tube is a sealed end, and the rear end is a negative pressure guiding port; and the central negative pressure guiding tube is communicated with the bearing pressure guiding tube. The invention only needs extremely short transition straight tube section, has the advantages of high precision, good repetitiveness, wide ratio of measuring range, low pressure loss, dirty resistance, difficult blocking and good stability, and can be used for measuring various complicated working conditions.

Description

V-type cone flow meter and using method thereof
Technical field
The present invention relates to a kind of V-type cone flow meter and using method thereof.
Background technology
The ways of measure pressure that differential pressure type flowmeters such as orifice plate commonly used, nozzle adopt is with the compression pressure of fluid center.
Because it is near typical, full-blown disturbed flow condition that differential pressure type flowmeters such as orifice plate commonly used, nozzle require the flow state of detected fluid, and the ideal fluid (being straight line) that does not have whirlpool is therefore at the forward and backward necessary quite long straight length of installing of differential pressure type flowmeters such as orifice plate or nozzle.Illustrate by GB/T2624.2-2006 table 3: when diameter equals 0.6 than the β value, then straight length is 42 times of internal diameter of the pipeline before the device, and back straight length is 7 times of internal diameter of the pipeline.
Like this, complex structure not only, and cause the waste of manufacturing materials.
Summary of the invention
The technical issues that need to address of the present invention just are to overcome the defective of prior art, a kind of V-type cone flow meter and using method thereof are provided, the transition straight length that the present invention only must extremely lack has solved flow measurement device commonly used fully because of satisfying the problem that its straight length design length in reserve requires to influence measuring accuracy, and the precision height, good reproducibility; Range ratio is wide, crushing is low; The dirt that bears dirty is difficult for stifled; Good stability can be surveyed various complex working conditions.
For addressing the above problem, the present invention adopts following technical scheme:
A kind of V-type cone flow meter of the present invention comprises measuring tube, is arranged at positive pressure guiding pipe and the negative pressure guiding pipe on the measuring tube and is vertically installed in the load-bearing pressure guiding pipe of measuring tube, and described load-bearing pressure guiding pipe upper end is communicated with negative pressure guiding pipe; Be provided with a V-type cone in the described measuring tube, described V-type cone is the hollow structure of a sealing, the front end of V-type cone is for meeting fluid end, the rear end is provided with V-type cone bonnet, run through and stretch out the V-type cone front and back ends, be provided with a negative pressure center pressure guiding pipe at V-type cone internal fixation, it is that blind end, tail end are negative pressure impulse mouth that described negative pressure center pressure guiding pipe is met fluid end, and described negative pressure center pressure guiding pipe is connected with the load-bearing pressure guiding pipe.
The angle that described V-type cone is met fluid surface is 45 °.
Described measuring tube two ends are connected with joint flange respectively.
The present invention discloses a kind of using method of described V-type cone flow meter, measured medium flows to the V-type cone shell in measuring tube, and positive pressure guiding pipe is arranged on the uniform flow zone of V-type cone upstream, therefore can take out stable malleation herein; Fluid is through the V-type cone, be subjected to cone and the dual extruding of measuring tube inwall, flow velocity increases and the pressure reduction, fluid is relative static conditions at the negative pressure impulse mouth place of V-type cone afterbody, negative pressure center pressure guiding pipe, because of fluid after throttling, in this zone only high frequency little whirlpool by a narrow margin can appear, the negative pressure signal fluctuation is very little, therefore can draw stable negative pressure by negative pressure center pressure guiding pipe, load-bearing pressure guiding pipe and negative pressure guiding pipe, reach the purpose of flow measurement.
The present invention is by compressing pressure with fluid at V-type cone periphery, the transition straight length that the present invention only must extremely lack has solved flow measurement device commonly used fully because of satisfying the problem that its straight length design length in reserve requires to influence measuring accuracy, straight length length in reserve of the present invention is: preceding straight length is 3 times of internal diameter of the pipeline, and back straight length is 1 times of internal diameter of the pipeline.
Compare common differential pressure flowmeter, the invention has the beneficial effects as follows:
A, flow development length require little:
Because general differential pressure flowmeter is for satisfying the flow measurement precision, the flow state that requires detected fluid is approaching typical full-blown disturbed flow condition and the ideal fluid (being straight line) that does not have whirlpool.Therefore when getting desired quantity 0.6, it reserves straight length theoretical length is that preceding straight length is 42 times of internal diameter of the pipeline when β value (diameter ratio), and back straight length is 7 times of internal diameter of the pipeline.(GB/T2624.2-2006 table 3).And V-type cone flow meter of the present invention is not because of needing rectification, it reserves the straight length requirement is 3 times of internal diameter of the pipeline for preceding straight length only, and back straight length is 1 times of internal diameter of the pipeline, has therefore significantly reduced the straight length length in reserve, both save the process pipe material, reduced space hold position, working site again.
B, precision height, good reproducibility:
Because positive pressure port of the present invention is on the tube wall of cone upstream, the pressure choice of location is at the constant speed zone of ideal fluid, malleation signal stabilization; Negative pressure port is positioned at cone-shaped body afterbody center, be in the downstream pressure Minimum Area, the structure because cone-shaped body is centrosymmetric makes the flow field of awl tail central area be relative static conditions, fluid high frequency little whirlpool by a narrow margin only occurs at negative pressuren zone after throttling, the negative pressure signal fluctuation is very little.Therefore, the differential pressure signal of output is highly stable.
Prove through flow rate test repeatedly: its measuring accuracy is higher than ± 0.5% (0.5 grade), reproducibility error<± 0.1%.
C, range ratio is wide, crushing is low:
Range ratio of the present invention can reach 8: 1 generally speaking, if parameter is selected rationally, maximum amount journey ratio can reach 15: 1.Taper throttling element and orifice plate throttling element are under same β value (diameter ratio), and the permanent compression of formation loses the former and is about the latter's 1/4.
D, the dirt that bears dirty are difficult for stifled:
Flow velocity can increase when fluid flows through the taper throttling element, and the inner-walls of duct etc. in positive pressure port, cone outer wall, positive and negative pressure zone is constantly washed away, and around the negative pressure tappings owing to level off to static state, fluid flows hardly.Therefore dirty medium can enter the impulse mouth of pipe of cone hardly.Simultaneously, dirty medium can not form at cone-shaped body tail end place to be piled up, so interior cone flow meter can be used for various impure, easy crystallizations, the easily fluid measurement of incrustation.
E, good stability, can survey various complex working conditions:
V-type cone flow meter of the present invention because of its air foil make fluid by the time produce the fluid boundary effect layer, make the medium throttling element edge that can not wear and tear.Thereby can make β value (diameter ratio) keep remaining unchanged for a long period of time.Be the no movable member that is welded because of complete machine simultaneously, need not repeat to demarcate after once demarcating, so its measuring accuracy can remain unchanged for a long period of time good stability.
Because V-type cone flow meter of the present invention can adopt different materials and pressure rating, can-200 ℃ to 1100 ℃ temperature and≤work under the 42MPa pressure condition, and body do not have detachable block, do not have the possibility of leakage.Therefore device can be under various complex working condition conditions steady operation.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Among the figure: 1, positive pressure guiding pipe; 2, measuring tube; 3, negative pressure guiding pipe; 4, load-bearing pressure guiding pipe; 5, V-type cone; 6, V-type cone bonnet; 7, center pressure guiding pipe; 8, joint flange.
Embodiment
As shown in Figure 1, a kind of V-type cone flow meter of the present invention comprises measuring tube 2, is arranged at positive pressure guiding pipe 1 and the negative pressure guiding pipe 3 on the measuring tube and is vertically installed in the load-bearing pressure guiding pipe 4 of measuring tube, and described load-bearing pressure guiding pipe upper end is communicated with negative pressure guiding pipe; Be provided with a V-type cone 5 in the described measuring tube, described V-type cone is the hollow structure of a sealing, the front end of V-type cone is for meeting fluid end, the rear end is provided with V-type cone bonnet 6, run through and stretch out the V-type cone front and back ends, be provided with a negative pressure center pressure guiding pipe 7 at V-type cone internal fixation, it is that blind end, tail end are negative pressure impulse mouth that described negative pressure center pressure guiding pipe is met fluid end, and described negative pressure center pressure guiding pipe is connected with the load-bearing pressure guiding pipe.
The angle that described V-type cone is met fluid surface is 45 °.
Described measuring tube two ends are connected with joint flange 8 respectively.
Measured medium flows to the V-type cone shell in measuring tube, positive pressure guiding pipe is arranged on the uniform flow zone of V-type cone upstream, therefore can take out stable malleation herein; Fluid is through the V-type cone, be subjected to cone and the dual extruding of measuring tube inwall, flow velocity increases and the pressure reduction, fluid is relative static conditions at the negative pressure impulse mouth place of V-type cone afterbody, negative pressure center pressure guiding pipe, because of fluid after throttling, in this zone only high frequency little whirlpool by a narrow margin can appear, the negative pressure signal fluctuation is very little, therefore can draw stable negative pressure by negative pressure center pressure guiding pipe, load-bearing pressure guiding pipe and negative pressure guiding pipe, reach the purpose of flow measurement.
The direction of arrow is the measured medium flow direction among Fig. 1.
The present invention is by compressing pressure with fluid at V-type cone periphery, the transition straight length that the present invention only must extremely lack has solved flow measurement device commonly used fully because of satisfying the problem that its straight length design length in reserve requires to influence measuring accuracy, straight length length in reserve of the present invention is: preceding straight length is 3 times of internal diameter of the pipeline, and back straight length is 1 times of internal diameter of the pipeline.
It should be noted that at last: obviously, the foregoing description only is for example of the present invention clearly is described, and is not the qualification to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all embodiments.And conspicuous variation of being extended out thus or change still are among protection scope of the present invention.

Claims (4)

1. V-type cone flow meter comprises measuring tube, is arranged at positive pressure guiding pipe and the negative pressure guiding pipe on the measuring tube and is vertically installed in the load-bearing pressure guiding pipe of measuring tube that described load-bearing pressure guiding pipe upper end is communicated with negative pressure guiding pipe; It is characterized in that: be provided with a V-type cone in the described measuring tube, described V-type cone is the hollow structure of a sealing, the front end of V-type cone is for meeting fluid end, the rear end is provided with V-type cone bonnet, run through and stretch out the V-type cone front and back ends, be provided with a negative pressure center pressure guiding pipe at V-type cone internal fixation, it is that blind end, tail end are negative pressure impulse mouth that described negative pressure center pressure guiding pipe is met fluid end, and described negative pressure center pressure guiding pipe is connected with the load-bearing pressure guiding pipe.
2. V-type cone flow meter as claimed in claim 1 is characterized in that: the angle that described V-type cone is met fluid surface is 45 °.
3. V-type cone flow meter as claimed in claim 2 is characterized in that: described measuring tube two ends are connected with joint flange respectively.
4. the using method of V-type cone flow meter as claimed in claim 3 is characterized in that: measured medium flows to the V-type cone shell in measuring tube, and positive pressure guiding pipe is arranged on the uniform flow zone of V-type cone upstream, therefore can take out stable malleation herein; Fluid is through the V-type cone, be subjected to cone and the dual extruding of measuring tube inwall, flow velocity increases and the pressure reduction, fluid is relative static conditions at the negative pressure impulse mouth place of V-type cone afterbody, negative pressure center pressure guiding pipe, because of fluid after throttling, in this zone only high frequency little whirlpool by a narrow margin can appear, the negative pressure signal fluctuation is very little, therefore can draw stable negative pressure by negative pressure center pressure guiding pipe, load-bearing pressure guiding pipe and negative pressure guiding pipe, reach the purpose of flow measurement.
CN 201010210624 2010-06-28 2010-06-28 V-cone flow meter and use method thereof Pending CN101881639A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201010210624 CN101881639A (en) 2010-06-28 2010-06-28 V-cone flow meter and use method thereof

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Application Number Priority Date Filing Date Title
CN 201010210624 CN101881639A (en) 2010-06-28 2010-06-28 V-cone flow meter and use method thereof

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102607652A (en) * 2012-03-29 2012-07-25 山东泽谊自控技术有限公司 Steady-state alpha sensor
CN105526979A (en) * 2015-12-31 2016-04-27 郑州光力科技股份有限公司 Gas drainage flow measurement device
WO2017080051A1 (en) * 2015-11-13 2017-05-18 苏州权素船舶电子有限公司 V-cone flow meter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2560923Y (en) * 2002-08-19 2003-07-16 天津市科特控制设备有限公司 V-shape conic flow meter
CN2851534Y (en) * 2005-11-02 2006-12-27 长庆石油勘探局 Holding device for swabbing ground-sliding vehicle
CN201697646U (en) * 2010-06-28 2011-01-05 江阴市节流装置厂有限公司 V-shaped cone flow meter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2560923Y (en) * 2002-08-19 2003-07-16 天津市科特控制设备有限公司 V-shape conic flow meter
CN2851534Y (en) * 2005-11-02 2006-12-27 长庆石油勘探局 Holding device for swabbing ground-sliding vehicle
CN201697646U (en) * 2010-06-28 2011-01-05 江阴市节流装置厂有限公司 V-shaped cone flow meter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
《科技资讯》 20080430 李奕,朱立军 V锥流量计设计要点 第61页 4 , 2 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102607652A (en) * 2012-03-29 2012-07-25 山东泽谊自控技术有限公司 Steady-state alpha sensor
WO2017080051A1 (en) * 2015-11-13 2017-05-18 苏州权素船舶电子有限公司 V-cone flow meter
CN105526979A (en) * 2015-12-31 2016-04-27 郑州光力科技股份有限公司 Gas drainage flow measurement device
CN105526979B (en) * 2015-12-31 2019-01-18 光力科技股份有限公司 Gas drainage under suction flow measurement device

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Open date: 20101110