CN2112803U - Straight pitot tube - Google Patents
Straight pitot tube Download PDFInfo
- Publication number
- CN2112803U CN2112803U CN 92211333 CN92211333U CN2112803U CN 2112803 U CN2112803 U CN 2112803U CN 92211333 CN92211333 CN 92211333 CN 92211333 U CN92211333 U CN 92211333U CN 2112803 U CN2112803 U CN 2112803U
- Authority
- CN
- China
- Prior art keywords
- straight
- pitot tube
- measuring
- measuring junction
- coaxial
- 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.)
- Granted
Links
Images
Landscapes
- Measuring Volume Flow (AREA)
Abstract
The utility model provides a straight pitot tube, and belongs to the field of the flow measurement. The measuring end of the straight pitot tube is in flat shape and is in straight coaxial structure with a main tube. Two measuring holes are distributed back to back. The outer end faces of the two measuring holes are coaxial, and the axial line of the two measuring holes is perpendicular to the main tube. Compared with the right angle-shaped pitot tube, the straight pitot tube has convenient insertion, the measuring value is higher with one time, and the discrimination is high. The utility model is used for the flow measurement of various industrial pipelines with transverse cut surfaces, is additionally provided with a fixed part and is matched with a transmitting and display instrument to form the online calibrating device of the flow instrument, and is used for the online measurement of the clean media.
Description
The invention belongs to flow measuring element, promptly be out of shape pitot tube.
The various standard pitot tubes that with world standard ISO 3966--1977 are representative are formed with being responsible for by nasal tube (measuring tube), its weak point is measuring junction and the rectangular structure of the person in charge, and it is big to occupy geometric space, be not easy to insert particularly small-bore pipeline of industrial pipeline, the differential pressure signal of measurement in theory only one times of dynamic pressure value (is △ p=ν
2* ρ/2), resolving ability is not high.
With Chinese patent ZL87212304.9 is that the various porous mean velocity tube flowmeters of representative are straight shape structures, but can only on the certain pipeline of diameter, measure mean flow rate, insertion pipe section (being measuring section) is communicated with the pressure guide hole aperture of several measured holes and does to such an extent that effect " is all pressed " in meeting influence less than normal, meeting bigger than normal increases the resistance to flow to measured medium, and then influences the stability of textural constant.
The objective of the invention is to provides a kind of resolving ability height, can conveniently insert the distortion pitot tube that arbitrary streamline is tested of various transversal section pipelines at above-mentioned weak point separately.
The objective of the invention is to realize as follows, cancellation and the nasal tube part of being responsible for rectangular structure on the basis of pitot tube, measuring junction is made coaxial straight shape structure with the person in charge, the perforate direction of two measured holes is opposite on the measuring junction, the outer face of two measured holes is coaxial, and its axis is perpendicular to the person in charge, and the end face of measuring junction makes and the coaxial half round post in two measured hole outer faces, two side surfaces of measuring junction and the end face of measuring junction are tangent, make measuring junction form flat.Because measuring junction is coaxial straight shape structure so be convenient to insert industrial pipeline with the person in charge.Because coaxial and axis normal person in charge Yu in measured hole outer face can measure arbitrary streamline easily by adjusting insertion depth.Because measuring junction is to have constituted flat by semi-cylindrical end face and both side surface are tangent, be convenient to allow and improve on the basis of the level of manufacturing and reduce physical dimension to greatest extent in material, can keep near the original a fluid stream distribution of measurement point during work to greatest extent, when the variation of a fluid stream is tending towards infinitely small, by Bernoulli equation is static pressure and dynamic pressure sum in the face of the pressure that the measured hole of a fluid stream is experienced as can be known, the pressure of the measured hole of a fluid stream impression is the poor of static pressure and dynamic pressure dorsad, (is △ ρ=ν so measuring-signal rises to twice dynamic pressure value
2* ρ), improved resolving ability, help measurement simultaneously to small-bore pipeline.
Below in conjunction with description of drawings one embodiment of the present of invention:
Accompanying drawing 1 is the application synoptic diagram of straight shape pitot tube, among the figure to measuring junction 1., be responsible for and 2. done broken section.
Accompanying drawing 2, for the measuring junction of straight shape pitot tube 1. along Fig. 1 arrow indication a fluid stream direction to view.
Straight shape pitot tube by the flat measuring junction 1., external diameter be 12mm the person in charge 2., connecting pipe 3., 4. connector form.Wherein 2. 1. measuring junction formed straight shape structure with the person in charge on same axis, and the diameter that 1. measuring junction is gone up is that two measured holes of 2mm are 5. coaxial, and being responsible for 2. relatively, axis is symmetrically distributed dorsad.Two measured holes inner face 5. respectively through two diameters pressure guide hole that is 2mm 8., 4. 3. inner chamber or the connecting pipe be responsible for 2. be communicated with two.Measuring junction end face 1. 7. be radius 1.5mm and with two semi-cylindricals that measured hole is 5. coaxial.Two side surfaces are 6. 7. tangent with measuring junction half-cylindrical end face 1., make measuring junction 1. form flat.5. the tapering of making 1:20 with the upper part at measured hole more help reducing taken up space.
Present embodiment inserted on the diameter 400mm standard wind-tunnel tests, when arbitrary measured hole 5. in the face of after a fluid stream direction, air velocity during greater than 10m/s its relative error less than 1%, air velocity during greater than 15m/s its relative error less than 0.5%.
Manufacture method of the present invention gets out measured hole, pressure guide hole on metal bar, with the metal pipe material welding, then measuring junction is ground moulding again.
The industrial pipeline that utilizes the present invention can insert various transversal sections is easily measured the dynamic pressure of each streamline, and then calculates flow velocity and flow.The on-line testing that therefore can be used for flow instrument, install additional fixed part be equipped with become give, Displaying Meter also can be used for online installation teletransmission and show.
Claims (3)
1, a kind of by measuring junction 1., be responsible for 2., straight shape pitot tube that 4. connector is formed, it is characterized in that: 6. 1. the measuring junction of flat be made of with half-cylindrical end face is 7. tangent two side surfaces, two measured holes perforate direction 5. is opposite, two measured hole outer faces 5. are coaxial, and 2. its axis is perpendicular to the person in charge.
2,, it is characterized in that 2. 1. measuring junction be coaxial straight shape structure with the person in charge according to the said straight shape pitot tube of claim 1.
3, according to the measuring junction of claim 1,2 said straight shape pitot tubes 1., it is characterized in that 7. half-cylindrical end face is coaxial with measured hole outer face 5..
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92211333 CN2112803U (en) | 1992-03-10 | 1992-03-10 | Straight pitot tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92211333 CN2112803U (en) | 1992-03-10 | 1992-03-10 | Straight pitot tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2112803U true CN2112803U (en) | 1992-08-12 |
Family
ID=4956358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92211333 Granted CN2112803U (en) | 1992-03-10 | 1992-03-10 | Straight pitot tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2112803U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061924A (en) * | 2016-11-09 | 2018-05-22 | 霍尼韦尔国际公司 | For the device and method of the film heating system of air data probe |
-
1992
- 1992-03-10 CN CN 92211333 patent/CN2112803U/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061924A (en) * | 2016-11-09 | 2018-05-22 | 霍尼韦尔国际公司 | For the device and method of the film heating system of air data probe |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4528847A (en) | Flow metering device with recessed pressure taps | |
| DE69434859D1 (en) | FLOW METER | |
| WO2005017466A3 (en) | System to measure density, specific gravity, and flow rate of fluids, meter, and related methods | |
| CN107179105A (en) | Flow measurement device | |
| CA1063386A (en) | Fluid pressure sensing apparatus | |
| EP0137623A1 (en) | A flowmeter | |
| CN107907168A (en) | Flow measurement device and system with choke preventing function | |
| CN2112803U (en) | Straight pitot tube | |
| CN110686736A (en) | Pressure taking head of Pitotbar flow sensor | |
| CN109443458A (en) | A kind of concave arc shape double fluid is to mean velocity tube flowmeter | |
| CN204831399U (en) | Stifled amount of wind, flue gas flux measuring apparatu are prevented to array | |
| CN212082473U (en) | Matrix flowmeter | |
| CN207610734U (en) | Flow measurement device with choke preventing function and system | |
| CN209878028U (en) | Low-resistance flow meter | |
| CN209247080U (en) | The throttling set of built-in high-precision sensor | |
| CN201653465U (en) | V-shaped conical flowmeter | |
| CN212082475U (en) | Flow measuring device | |
| CN204988382U (en) | Amount of wind measuring transducer | |
| CN208860411U (en) | A kind of concave arc shape double fluid is to mean velocity tube flowmeter | |
| CN213579654U (en) | Flowmeter calibration device | |
| CN218994430U (en) | Acceleration type balance flow sensor | |
| CN2391174Y (en) | Integral ultrasound flow meter | |
| CN211576247U (en) | Slot type air quantity and air pressure measuring sheet | |
| DD250180A1 (en) | FLOW FLOW KNIFE FOR SMALL TUBE NUTS | |
| CN215727501U (en) | Online differential pressure type density measuring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |