CN2325762Y - Device for measuring small amount of flow - Google Patents
Device for measuring small amount of flow Download PDFInfo
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- CN2325762Y CN2325762Y CN 98206185 CN98206185U CN2325762Y CN 2325762 Y CN2325762 Y CN 2325762Y CN 98206185 CN98206185 CN 98206185 CN 98206185 U CN98206185 U CN 98206185U CN 2325762 Y CN2325762 Y CN 2325762Y
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- throat
- draw
- expander
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- flow
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Abstract
The utility model discloses a flow measuring device, which is device for measuring small amount of flow. The utility model comprises a front straight tube section, a venturi tube composed of a front shrinkage tube and a rear expanding tube, an intelligent differential pressure transmitter and a secondary meter microcomputer data collecting unit. The utility model is characterized in that the front straight tube section, the front shrinkage tube and the rear expanding tube are welded into integration, form an improved venturi tube throttling device, and simultaneously form a front pressure-taking annular casing, a throat pressure-taking annular casing and a narrow slit communicated with a throat flow passage. The length of the throat flow passage doubles the diameter of the throat, and the width of the narrow slit is not more than 1 mm. The device for measuring small amount of flow can be used for measuring in high temperature (T < = 340 DEG C), high pressure (P < = 16MPa), small-diameter (Di < = 10 mm), low pressure loss (delta pmax < = 120 mm H <2> O) and small amount of flow (Mmin approximately equal to 5 kg / h), with good versatility.
Description
The utility model belongs to a kind of flow measurement device, is specifically related to a kind of improvement of small amount of flow measuring device.
To the measuring method and the instrument of tiny flow quantity, the diligent first-class in Japanese little palace " is proposing flowmeters such as turbine, ultrasound wave, float-type, electromagnetic type or hot-wire in flow measurement handbook one book and all can measure tiny flow quantity.In throttling flow meter, point out that the flux lower limit of throttling flow meter is determined by the Reynolds number lower limit, i.e. Remax 〉=2 * 10
3Internal diameter of the pipeline D 〉=50mm.And known standard round conical entrance Venturi tube as shown in Figure 2, and it is made up of six essential parts, promptly preceding straight length (1 '), entrance cone pipe (the preceding draw) (3 '), outlet conical tube (back expander) (5 '), back straight length (15 '), imperial palace cover (11 ') and little interior cover (12 ').With the straight length of going forward (1 '), the preceding draw (3 '), back expander (5 ') and back straight length (15 ') use bolt (10 '), (13 ') and (14 ') to be interconnected to Venturi tube in order.In the anterior cylinder of preceding straight length (1 ') inner groove and preceding tracting pressuring hole (2 ') are arranged, in the rear portion cylinder of the preceding draw (3 ') inner groove and throat's tracting pressuring hole (4 ') are arranged, imperial palace cover (11 ') front portion has at least 6 apertures to be not less than the inside and outside intercommunicating pore of 3mm, the anterior cylinder of it and the preceding draw (3 ') match constitute before the impulse ring casing, the internal diameter and the pipe range of cover (12 ') equal the aperture d of Venturi tube throat in little, and cover (12 ') middle part is evenly distributed in the inside and outside intercommunicating pore that 6 apertures are not less than 2mm in little, it and the rear portion cylinder of the preceding draw (3 ') the formation throat impulse ring casing that matches.The positive and negative pressure chamber of differential pressure transmitter (7 ') is communicated with preceding impulse ring casing and throat's impulse ring casing respectively by pressure guiding pipe (6 '), and secondary instrument (9 ') links to each other with differential pressure transmitter (7 ') by signal cable (8 ').All data of standard Venturi tube all are at caliber scope 50～250mm, provide under the condition of throttle diameter than β=0.4～0.7, rule of thumb, more than the about 1000kg/h of its minimum measurable flow amount under this condition, in the High Temperature High Pressure system, can't measure the minute-pressure difference signal (△ P＜1mmH below the 100kg/h
2O), therefore with the standard Venturi tube fully not below the energy measurement 100kg/h, the such tiny flow quantity of 5～20kg/h particularly.More than several flowmeters and standard Venturi tube flow measurement device all can not satisfy high temperature (t≤340 ℃) simultaneously, high pressure (P≤16MPa), little caliber (Di≤10mm), low pressure loss (δ pmax≤120mmH
2O) and the measurement requirement of tiny flow quantity (Mmin ≈ 5kg/h).
The purpose of this utility model provides and a kind ofly can satisfy high temperature (t≤340 ℃) simultaneously, and high pressure (P≤16MPa), little caliber (Di≤10mm), low pressure loss (δ pmax≤120mmH
2O) and the small amount of flow measuring device of tiny flow quantity (Mmin ≈ 5kg/h) measurement requirement.
The utility model is achieved in that a kind of small amount of flow measuring device, it comprises the Venturi tube of being made up of preceding straight length, the preceding draw and back expander, the preceding tracting pressuring hole of Venturi tube and throat's tracting pressuring hole are communicated with the positive and negative pressure chamber of intellectual differential pressure transmitter respectively by pressure guiding pipe, and intellectual differential pressure transmitter is connected with the microcomputer data acquisition unit with secondary instrument by signal cable.Wherein, said Venturi tube is the modified Venturi tube, the end of its preceding straight length has one section cylindrical step, the end of this step has annular groove, communicate with the pipe inner flow passage by being evenly distributed in six apertures in the groove, preceding draw front end has one section and the corresponding endoporus step of the terminal cylindrical step of preceding straight length, its hole depth equates with said cylindrical length of bench, preceding straight length and the combination of the preceding draw also are welded into integral body, pressure ring casing before said annular groove is formed, have the preceding tracting pressuring hole that communicates with annular groove at preceding draw sidewall, the conical bore aperture of preceding draw end equals the aperture d of Venturi tube throat, Kong Changwei 0.75d, the terminal conical bore outer wall of the preceding draw has a step, little 5～the 6mm of stepped hole internal diameter that its outside diameter is opened than back expander front end, its length of bench is than the little 0.4～0.5d of step hole depth of back expander, back expander front end throat hole diameter is d, length is 0.75d, the preceding draw and back expander assembly welding are integral, the terminal circular cone aperture of the draw communicates with back expander front end throat aperture before making, form throat's runner, and the length of this throat's runner equals 1.5～2 times of aperture d of throat's runner, form throat's pressure ring casing between the stepped hole of the step of the end of the draw and back expander front end before making, before form width between the draw and the back expander adjacent face and be≤narrow slit of 0.5d is communicated with throat's pressure ring casing with the throat runner, throat's pressure ring casing through an axial hole be opened in after throat's pressure port on the expander sidewall communicate.
According to summary of the invention of the present utility model and technical measures, a few cover modified Venturi tubes have been made, caliber is 10～12mm, the throat aperture is 1.5～2.6mm, length overall is 100～140mm, calibration result: minimum flow is 4.8kg/h, and the pressure loss is less than 1/4 of pressure difference signal, be δ pmax≤1/4 △ P, calibrated error is ± 0.5%.Successfully use heat-transfer pipe double-sided heat transfer research, steam generator experimental study, and in other experiment, be suitable for high temperature (t≤340 ℃), high pressure (measure reliably, and precision is higher, and is respond well by the measurement of the tiny flow quantity of P≤16MPa).
Now in conjunction with the accompanying drawings and embodiments the utility model is done specific descriptions:
Fig. 1 is a small amount of flow measuring device synoptic diagram provided by the utility model, demonstrates modified Venturi tube structure among the figure.
Fig. 2 is known flow measurement device synoptic diagram, demonstrates the Venturi tube restriction device structure of standard among the figure.
As shown in Figure 1, a kind of small amount of flow measuring device, it comprises a modified Venturi tube restriction device, intellectual differential pressure transmitter 7, and secondary instrument and microcomputer data acquisition unit 9, secondary instrument takes system 9 to be connected with intellectual differential pressure transmitter 7 by signal cable 8 with Microcomputer Data, the malleation chamber of intellectual differential pressure transmitter 7 is communicated with the preceding tracting pressuring hole 2 of modified Venturi tube by pressure guiding pipe 6, and negative pressure cavity is communicated with throat's tracting pressuring hole 4 of modified Venturi tube by another pressure guiding pipe 6.Modified Venturi tube restriction device is to be assembled by preceding straight length 1, the preceding draw 3 and back expander 5.Their structure and assembling are like this: the end of preceding straight length 1 has one section cylindrical step, this step end has an annular groove, communicate with the pipe inner flow passage by being evenly distributed in 6 apertures that are not more than 2mm in the annular groove, the front end of the preceding draw 3 has one section and the corresponding endoporus step of preceding straight length 1 terminal cylindrical step, its hole depth equates with the cylindrical length of bench, before straight length 1 assembly welding that matches with the preceding draw 3 become integral body, pressure ring casing before said annular groove and six apertures are formed has the preceding tracting pressuring hole 2 that communicates with annular groove at the preceding draw 3 sidewalls.The conical bore aperture of the preceding draw 3 ends equals the aperture d of Venturi tube throat, Kong Changwei 0.75d, the preceding draw 3 terminal conical bore outer walls have a step, little 5～the 6mm of stepped hole internal diameter that its external diameter is opened than back expander 5 front ends, its length of bench is than the little 0.5d of step hole depth of back expander 5, and require 0.5d≤1mm, back expander 5 front end throat hole diameters also are d, length is 0.75d, the preceding draw 3 and back expander 5 assembly weldings are integral, the draw 3 terminal conical bores communicate with back expander 5 front end throat apertures before making, and form throat's runner, and the length of this throat's runner equal 2 times of aperture d.Form throat's pressure ring casing between the stepped hole of the step of the small bore end of the draw 3 and back expander 5 front ends before making, before to form width between the draw 3 and the back expander adjacent face be that the narrow slit of 0.5d is communicated with throat's pressure ring casing with the throat runner, throat's pressure ring casing communicates with throat's pressure port 4 on being opened in back expander 5 sidewalls by an axial 3mm aperture.Back expander 5 also has straight length.The circular cone drift angle of the preceding draw 3 is Φ 1=18 °.The circular cone drift angle of back expander 5 is Φ 2=10 °～14 °.Throat's length overall of modified Venturi tube is 2 times of throat aperture like this, i.e. 2d, and the impulse narrow slit is 0.5d, but is not more than 1mm, and the throat length of known standard Venturi tube equals the aperture d of throat.These all are different from the standard Venturi tube.
In the present embodiment, the preceding draw 3 terminal cylindrical stepped diameters match than back expander 5 front ends and locate the little 6mm of endoporus step internal diameter; Before form 0.8mm width seam between the draw 3 terminal surfaces and back expander 5 front end faces, i.e. 0.5d=0.8mm, d=1.6mm, promptly modified Venturi tube throat aperture is 1.6mm, throat length is 2d=3.2mm; 2=12 ° of the circular cone drift angle Φ of back expander 5.
The utility model can satisfy high temperature (t≤340 ℃) simultaneously, and high pressure (P≤16MPa), little caliber (Di≤10mm), low pressure loss (δ pmax≤120mmH
2O) and the measurement requirement of tiny flow quantity (Mmin ≈ 5kg/h).
Claims (2)
1. small amount of flow measuring device, it comprises by preceding straight length (1), the Venturi tube that the preceding draw (3) and back expander (5) are formed, the preceding tracting pressuring hole (2) of Venturi tube and throat's tracting pressuring hole (4) by pressure guiding pipe (6) respectively with intellectual differential pressure transmitter (7) just, negative pressure cavity is communicated with, intellectual differential pressure transmitter (7) is connected with microcomputer data acquisition unit (9) with secondary instrument by signal cable (8), it is characterized in that: said Venturi tube is the modified Venturi tube, the end of its preceding straight length (1) has one section cylindrical step, the end of this step has annular groove, communicate with the pipe inner flow passage by being evenly distributed in six apertures in the groove, the preceding draw (3) front end has one section and the corresponding endoporus step of the terminal cylindrical step of preceding straight length (1), its hole depth equates with said cylindrical length of bench, the preceding straight length (1) and the preceding draw (3) make up and are welded into one, pressure ring casing before said annular groove is formed, have the preceding tracting pressuring hole (2) that communicates with annular groove at the preceding draw (3) sidewall, the terminal conical bore aperture of the preceding draw (3) equals the aperture d of Venturi tube throat, Kong Changwei 0.75d, the preceding terminal conical bore outer wall of the draw (3) has a step, little 5～the 6mm of stepped hole internal diameter that its outside diameter is opened than back expander (5) front end, its length of bench is than the little 0.4～0.5d of step hole depth of back expander (5), back expander (5) front end throat hole diameter is d, length is 0.75d, the preceding draw (3) and back expander (5) assembly welding are integral, the terminal circular cone aperture of the preceding draw (3) is communicated with back expander (5) front end throat aperture, form throat's runner, and the length of this throat's runner equals 1.5～2 times of the flow passage aperture d of throat, make between the stepped hole of the step of front end of the preceding draw (3) and back expander (5) front end and form throat's pressure ring casing, before between the draw (3) and back expander (5) adjacent face formation width be≤narrow slit of 0.5d is communicated with throat's pressure ring casing with the throat runner, throat's pressure ring casing through an axial hole be opened in after throat's pressure port (4) on expander (5) sidewall communicate.
2. according to the said a kind of small amount of flow measuring device of claim 1, it is characterized in that: uniform small aperture is 1.5～2mm in the annular groove of preceding straight length (1), 1=18 ° of the circular cone drift angle Φ of the preceding draw (3).2=12 ° of the circular cone drift angle Φ of back expander (5), the flow passage aperture d=1.6mm of throat that forms behind the preceding draw (3) and back expander (5) assembly welding, throat's flow channel length is 2d=3.2mm, and forming width between the both ends of the surface behind the preceding draw (3) and back expander (5) assembly welding is the narrow slit of 0.8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98206185 CN2325762Y (en) | 1998-06-29 | 1998-06-29 | Device for measuring small amount of flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98206185 CN2325762Y (en) | 1998-06-29 | 1998-06-29 | Device for measuring small amount of flow |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2325762Y true CN2325762Y (en) | 1999-06-23 |
Family
ID=33962408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98206185 Expired - Lifetime CN2325762Y (en) | 1998-06-29 | 1998-06-29 | Device for measuring small amount of flow |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2325762Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007016865A1 (en) * | 2005-08-10 | 2007-02-15 | Yu Chen | A flow measuring device of a stream |
| CN106441468A (en) * | 2016-09-18 | 2017-02-22 | 中国核动力研究设计院 | Venturi flow meter for bidirectional flow measurement and measurement method thereof |
| CN106482794A (en) * | 2016-10-28 | 2017-03-08 | 东风商用车有限公司 | A kind of EGR engine differential pressure type flowmeter |
| CN107144312A (en) * | 2017-05-26 | 2017-09-08 | 苏州天大泰和自控仪表技术有限公司 | Flow measuring apparatus and flow meter assembly |
| CN111633974A (en) * | 2020-06-05 | 2020-09-08 | 中国海洋石油集团有限公司 | Processing method of composite nested pipe |
| CN117444551A (en) * | 2023-12-25 | 2024-01-26 | 常州可威尔仪表制造有限公司 | Manufacturing process and measuring method of high-precision venturi flowmeter |
-
1998
- 1998-06-29 CN CN 98206185 patent/CN2325762Y/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007016865A1 (en) * | 2005-08-10 | 2007-02-15 | Yu Chen | A flow measuring device of a stream |
| CN106441468A (en) * | 2016-09-18 | 2017-02-22 | 中国核动力研究设计院 | Venturi flow meter for bidirectional flow measurement and measurement method thereof |
| CN106441468B (en) * | 2016-09-18 | 2019-09-06 | 中国核动力研究设计院 | A kind of Venturi meter and its measurement method of achievable bidirectional traffics measurement |
| CN106482794A (en) * | 2016-10-28 | 2017-03-08 | 东风商用车有限公司 | A kind of EGR engine differential pressure type flowmeter |
| CN106482794B (en) * | 2016-10-28 | 2023-10-24 | 东风商用车有限公司 | Venturi flowmeter of EGR engine |
| CN107144312A (en) * | 2017-05-26 | 2017-09-08 | 苏州天大泰和自控仪表技术有限公司 | Flow measuring apparatus and flow meter assembly |
| CN111633974A (en) * | 2020-06-05 | 2020-09-08 | 中国海洋石油集团有限公司 | Processing method of composite nested pipe |
| CN111633974B (en) * | 2020-06-05 | 2022-05-03 | 中国海洋石油集团有限公司 | Processing method of composite nested pipe |
| CN117444551A (en) * | 2023-12-25 | 2024-01-26 | 常州可威尔仪表制造有限公司 | Manufacturing process and measuring method of high-precision venturi flowmeter |
| CN117444551B (en) * | 2023-12-25 | 2024-03-12 | 常州可威尔仪表制造有限公司 | Manufacturing process and measuring method of high-precision venturi flowmeter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |