CN105115549A - Large-diameter multi-throat flow meter - Google Patents

Large-diameter multi-throat flow meter Download PDF

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Publication number
CN105115549A
CN105115549A CN201510491807.4A CN201510491807A CN105115549A CN 105115549 A CN105115549 A CN 105115549A CN 201510491807 A CN201510491807 A CN 201510491807A CN 105115549 A CN105115549 A CN 105115549A
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CN
China
Prior art keywords
flowmeter
pressure
rectangle
venturi tube
built
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
CN201510491807.4A
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Chinese (zh)
Inventor
唐力南
李文亮
禹继波
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.)
YINCHUAN RONGSHENWEI AUTOMATION INSTRUMENT FACTORY (CO LTD)
Original Assignee
YINCHUAN RONGSHENWEI AUTOMATION INSTRUMENT FACTORY (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 YINCHUAN RONGSHENWEI AUTOMATION INSTRUMENT FACTORY (CO LTD) filed Critical YINCHUAN RONGSHENWEI AUTOMATION INSTRUMENT FACTORY (CO LTD)
Priority to CN201510491807.4A priority Critical patent/CN105115549A/en
Publication of CN105115549A publication Critical patent/CN105115549A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a large-diameter, low-pressure and low-flow speed little micro-fluid measuring device, in particular to a large-diameter multi-throat flow meter. The large-diameter multi-throat flow meter comprises a measuring pipeline; the large-diameter multi-throat flow meter is characterized in that four same built-in rectangular measuring devices are uniformly arranged in the measuring pipeline through a support frame; each built-in rectangular measuring device is provided with a pair of pressure sampling pipes; the four pairs of pressure sampling pipes are connected and converged into a main pressure sampling pipe, which is used for outwards outputting a balanced pressure difference signal, by pressure equalizing rings. According to the large-diameter multi-throat flow meter disclosed by the invention, the structure is unique, the differential pressure can be increased, the anti-blocking performance is good, the pressure loss is small, a measuring range can be wider, the measuring accuracy is higher, and an energy-saving effect is obvious.

Description

A kind of heavy caliber many larynxs flowmeter
Technical field
The present invention relates to the little micro-fluid measurement device of a kind of heavy caliber, low-pressure, low flow velocity, especially relate to a kind of heavy caliber many larynxs flowmeter.
Background technology
At present, be applicable to for heavy caliber, low-pressure, the low pressure Large Diameter Pipeline fluid measurement of low flow velocity commonly uses flow in respect of multiple, such as differential pressure type, float-type, positive displacement, hot type etc., wherein some flowmeter was both applicable to large discharge in measurement, also be applicable to measuring tiny flow quantity, but all there is certain restriction, and other design for measuring tiny flow quantity specially, such as notification number: 103542896A discloses a kind of patent of heavy caliber gasmetry instrument, the contraction section of its interior venturi venturi outside, fluid does not steadily have eddy current, eddy current loss is had during two bursts of disorderly air-flow mixing, measuring accuracy decreases, and differential pressure signal is unstable.When fluid flows through outer venturi, to its contraction section, some enters inner venturi tube again, and now fluid resistance is large, and the Pressure Drop of outlet is little, and make the corresponding reduction of flow amount entering inner venturi tube, differential pressure value is corresponding reduction also.
So far, the device of above-mentioned defect is not also overcome.
Summary of the invention
The object of the invention is the defect overcoming prior art, provide a kind of structure unique, differential pressure can be improved, anti-blocking performance is good, the pressure loss is little, make that measurement range is wider, measuring accuracy is higher, the significant a kind of heavy caliber many larynxs flowmeter of energy-saving effect.
The present invention realizes in the following way:
A kind of heavy caliber many larynxs flowmeter, it comprises measuring channel, it is characterized in that: by uniform four the same built-in rectangle measurement mechanisms of bracing frame in measuring channel, each built-in rectangle measurement mechanism is equipped with a pair pressure pipe, and four pairs of pressure pipes are connected the total pressure pipe gathered for outwards exporting the differential pressure signal after equilibrium by grading ring;
Described each built-in rectangle measurement mechanism is socketed to form by outer Venturi tube and interior rectangle flowmeter, and interior rectangle flowmeter and outer Venturi tube are in the geometric centre axes in same cross section;
Described often pair of pressure pipe is arranged in described interior rectangle flowmeter and outer Venturi tube;
Described outer Venturi tube is made up of straight length, contraction section, straight length, compression section and diffuser connecting pipe, and interior rectangle flowmeter is made up of straight length, the voussoir with α and β angle, and voussoir car is put down concordant with the central axis of interior rectangle flowmeter.
The present invention has following effect:
1) structure is unique: the built-in rectangular flow measuring device of the many larynxs of heavy caliber provided by the invention, it is according to Bernoulli equation, continuity equation is as theory deduction foundation, in the many larynxs of the heavy caliber built-in rectangular flow measuring device of design, uniform four same built-in rectangle measurement mechanisms weld in the duct wall that is supported on respectively at pipe, it is socketed by outer Venturi tube and interior rectangle flowmeter and forms, interior rectangle flowmeter and outer Venturi tube are in the geometric centre axes in same cross section, outer Venturi tube is by straight length, contraction section, straight length, compression section and diffuser connecting pipe composition, the straight length of outer Venturi tube left end, play the effect of current stabilization, the contraction section of outer Venturi tube makes orifice size diminish, flow velocity increases, straight length fluid that flow velocity is increased steadily get off, again close up and orifice size diminished again in its compression section, pressure becomes large, its diffuser makes static pressure diminish, fluid can not produce eddy current.Interior rectangle flowmeter is made up of the voussoir of straight length, α and β angle, and voussoir car is flat concordant with central axis.Interior rectangle flowmeter and outer venturi pipe bit hole are welded to connect taking-up differential pressure signal by this pair pressure pipe.Four pairs of pressure pipes are connected by grading ring, make four groups of pressure signals obtain effective equilibrium, and outwards export the differential pressure signal after equilibrium by one group of total pressure pipe.Interior rectangle flowmeter is the core parts measured, and outer Venturi tube is the critical component that differential pressure is amplified.
2) differential pressure can be improved, anti-blocking performance is good, the pressure loss is little, make that measurement range is wider, measuring accuracy is higher, the pressure loss is little, obvious energy conservation: flowmeter provided by the invention is when the conical hollow passage of fluid between outer Venturi tube and interior rectangle flowmeter, actual internal area constantly reduces, flow velocity is constantly accelerated, hydrodynamic becomes large, static pressure diminishes, and the pressure difference value entering the entrance and exit of rectangular flow gauge 3 becomes large.Straight length rectification makes fluid steady, pressure P 1 fluid is had through contraction section, pressure to be reduced, there is a P2, at this moment just pressure differential is defined, make fluid from the fluid of straight length before outer venturi contraction section closing in larynx neck position to interior rectangle flowmeter, flow velocity is accelerated, when at this moment having pressure P 3 fluid to enter contracted section in interior rectangle flowmeter, define again a pressure P 4, in order to get a stable differential pressure value, a straight voussoir is devised in interior rectangle flowmeter throat, so not only differential pressure value is stablized but also be it also avoid the Accuracy wearing and tearing and bring.
3) make differential pressure signal by multiple amplification, and differential pressure value is stablized: to process pipe straight-line segment, flowmeter provided by the invention requires that length is short, differential pressure is stablized, the rectification again of the rectification dual by improved outer Venturi tube and suction and built-in rectangular flow gauge and swabbing action, make differential pressure signal by multiple amplification, and differential pressure value is stablized, the built-in rectangular flow measuring device of the many larynxs of heavy caliber is installed almost does not have straight length requirement.
4) easy to maintenance, measure accurately, measurement range is wide: flowmeter provided by the invention, due to the many larynxs of heavy caliber built-in rectangular flow measuring device differential pressure line smoothing, steadily, good linearity, the resolution thus had, it is accurate to measure.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is Fig. 1 left view of the present invention.
Embodiment
A kind of heavy caliber many larynxs flowmeter, it comprises measuring channel 1, as illustrated in fig. 1 and 2: by uniform four the same built-in rectangle measurement mechanisms 11 of bracing frame 10 in measuring channel 1, each built-in rectangle measurement mechanism 11 is equipped with a pair pressure pipe, and four pairs of pressure pipes are connected the total pressure pipe 9 gathered for outwards exporting the differential pressure signal after equilibrium by grading ring 8.
Described each built-in rectangle measurement mechanism 11 is socketed to form by outer Venturi tube 2 and interior rectangle flowmeter 3, and interior rectangle flowmeter 3 and outer Venturi tube 2 are in the geometric centre axes in same cross section.
Described often pair of pressure pipe is arranged in described interior rectangle flowmeter 3 and outer Venturi tube 2.
Described outer Venturi tube 2 is made up of straight length, contraction section, straight length, compression section and diffuser connecting pipe, and interior rectangle flowmeter 3 is made up of straight length, the voussoir with α and β angle, and voussoir car is put down concordant with the central axis of interior rectangle flowmeter 3.
Interior rectangle flowmeter 3 and outer Venturi tube 2 are holed and are welded to connect taking-up differential pressure signal by 4,5 these a pair pressure pipe.Four pairs of pressure pipes are connected by grading ring 8, make four groups of pressure signals obtain effective equilibrium, and outwards export the differential pressure signal after equilibrium by one group of total pressure pipe 9.Interior rectangle flowmeter 3 is the core parts measured, and outer Venturi tube is the critical component that differential pressure is amplified.

Claims (4)

1. heavy caliber many larynxs flowmeter, it comprises measuring channel (1), it is characterized in that: by uniform four the same built-in rectangle measurement mechanisms (11) of bracing frame (10) in measuring channel (1), each built-in rectangle measurement mechanism (11) is equipped with a pair pressure pipe, and four pairs of pressure pipes are connected the total pressure pipe (9) gathered for outwards exporting the differential pressure signal after equilibrium by grading ring (8).
2. a kind of heavy caliber many larynxs flowmeter as claimed in claim 1, it is characterized in that: described each built-in rectangle measurement mechanism (9) is socketed to form by outer Venturi tube (2) and interior rectangle flowmeter (3), interior rectangle flowmeter (3) and outer Venturi tube (2) are in the geometric centre axes in same cross section.
3. a kind of heavy caliber many larynxs flowmeter as claimed in claim 1 or 2, is characterized in that: described often pair of pressure pipe is arranged in described interior rectangle flowmeter (3) and outer Venturi tube (2).
4. a kind of heavy caliber many larynxs flowmeter as claimed in claim 2, it is characterized in that: described outer Venturi tube (2) is made up of straight length, contraction section, straight length, compression section and diffuser connecting pipe, interior rectangle flowmeter (3) is made up of straight length, the voussoir with α and β angle, and voussoir car is flat concordant with the central axis of interior rectangle flowmeter (3).
CN201510491807.4A 2015-08-12 2015-08-12 Large-diameter multi-throat flow meter Pending CN105115549A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510491807.4A CN105115549A (en) 2015-08-12 2015-08-12 Large-diameter multi-throat flow meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510491807.4A CN105115549A (en) 2015-08-12 2015-08-12 Large-diameter multi-throat flow meter

Publications (1)

Publication Number Publication Date
CN105115549A true CN105115549A (en) 2015-12-02

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107179105A (en) * 2017-06-05 2017-09-19 神华集团有限责任公司 Flow measurement device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6158471A (en) * 1998-07-03 2000-12-12 Filterwerk Mann & Hummel Gmbh Mixing device for changing a fluid into another flowing fluid
CN2420621Y (en) * 2000-05-10 2001-02-21 温汉璋 Inserting three throat venturi flow meter
CN201622085U (en) * 2010-01-29 2010-11-03 陕西仪新测控仪表有限公司 Novel built-in double Venturi tube assembly
CN202033058U (en) * 2011-04-15 2011-11-09 华北电力大学 Real-time measuring device for air supply flow of boiler
CN104501884A (en) * 2014-12-08 2015-04-08 上海科洋科技股份有限公司 Rectangular flowmeter
CN204944562U (en) * 2015-08-12 2016-01-06 银川融神威自动化仪表厂(有限公司) A kind of heavy caliber many larynxs flowmeter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6158471A (en) * 1998-07-03 2000-12-12 Filterwerk Mann & Hummel Gmbh Mixing device for changing a fluid into another flowing fluid
CN2420621Y (en) * 2000-05-10 2001-02-21 温汉璋 Inserting three throat venturi flow meter
CN201622085U (en) * 2010-01-29 2010-11-03 陕西仪新测控仪表有限公司 Novel built-in double Venturi tube assembly
CN202033058U (en) * 2011-04-15 2011-11-09 华北电力大学 Real-time measuring device for air supply flow of boiler
CN104501884A (en) * 2014-12-08 2015-04-08 上海科洋科技股份有限公司 Rectangular flowmeter
CN204944562U (en) * 2015-08-12 2016-01-06 银川融神威自动化仪表厂(有限公司) A kind of heavy caliber many larynxs flowmeter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
陈烨: "双文丘里管在烟气流量测量中的应用", 《干燥技术与设备》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107179105A (en) * 2017-06-05 2017-09-19 神华集团有限责任公司 Flow measurement device

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Application publication date: 20151202