CN203848879U - Logarithmic liner cross section air volume measuring device - Google Patents
Logarithmic liner cross section air volume measuring device Download PDFInfo
- Publication number
- CN203848879U CN203848879U CN201420142462.2U CN201420142462U CN203848879U CN 203848879 U CN203848879 U CN 203848879U CN 201420142462 U CN201420142462 U CN 201420142462U CN 203848879 U CN203848879 U CN 203848879U
- Authority
- CN
- China
- Prior art keywords
- pressure
- logarithmic
- log
- liner
- measuring
- 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.)
- Expired - Lifetime
Links
- 239000000523 sample Substances 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract 2
- 238000010079 rubber tapping Methods 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
Landscapes
- Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
Abstract
The utility model discloses a logarithmic liner cross section air volume measuring device which comprises a measuring pipeline. A pressure manifold pipe is arranged at the center of the measuring pipeline, the measuring pipeline is provided with a plurality of logarithmic liner pressure-sensing probes in the radial direction, the logarithmic liner pressure-sensing probes facing the fluid direction are provided with five detection holes, the detection holes are distributed in the length direction of the logarithmic liner pressure-sensing probes, positions of five detection holes are sequentially 0.277R, 0.566R, 0.695R, 0.847R and 0.962R, wherein the R is the radius of the measuring pipeline, the logarithmic liner pressure-sensing probes are communicated with the pressure manifold pipe, a pressure tapping pipe is vertically arranged on the measuring pipeline and communicated with the pressure manifold pipe, the flowing speed in the measuring pipeline can be divided into five average flowing speed faces, the principle is determined by adopting a logarithmic liner method, experimental results show that errors of the logarithmic liner method are almost non-existent, and therefore the measuring accuracy is high.
Description
Technical field
The utility model relates to a kind of log-linear xsect apparatus for measuring air quantity.
Background technology
Log-linear xsect apparatus for measuring air quantity is mainly used in the flow measurement of air quantity system in large scale industry pipeline, because fluid in ducted velocity flow profile is: the slowest near tube wall place flow velocity, flow velocity near place of pipeline center is the fastest, general apparatus for measuring air quantity is all flow velocitys of single-point in measuring channel, thereby calculate the flow in pipeline, due to the unevenness of flow velocity in pipeline, so single-point flow velocity can not embody the true flow condition in pipeline, as shown in Figure 1, flow velocity in pipeline is curved layout, be that center flow velocity is the highest, minimum along tube wall flow velocity, when in the time that built in pipeline enters to pop one's head in, due to flow velocity difference, so the pressure of each point impression is also different, measurement mechanism is in the past all on probe, on average to open pressure sensing hole or measure single-point pressure, the pressure measuring is like this extremely inaccurate, measure inaccurate result thereby bring.
Utility model content
The purpose of this utility model is to overcome the defect existing in prior art, and the log-linear xsect apparatus for measuring air quantity that a kind of measuring accuracy is high is provided.
For achieving the above object, the technical solution of the utility model has been to provide a kind of log-linear xsect apparatus for measuring air quantity, comprise measuring channel, the center of described measuring channel is provided with pressure gathering tube, described measuring channel is radially provided with some log-linear pressure-sensitive probes along it, described log-linear pressure-sensitive pop one's head in positive convection cell direction offer five detect holes, described detection hole distributes along the length direction of described log-linear pressure-sensitive probe, the position in the detection hole described in five is followed successively by 0.277R, 0.566R, 0.695R, 0.847R, 0.962R, the radius that wherein R is measuring channel, described log-linear pressure-sensitive probe is connected with described pressure gathering tube, on described measuring channel, be vertically installed with pressure pipe, described pressure pipe is connected with described pressure gathering tube.
As preferably, described log-linear pressure-sensitive probe has three, and is evenly arranged in described measuring channel.
Advantage of the present utility model and beneficial effect are: the flow velocity in measuring channel can be divided into 5 mean flow rate faces, the definite of this principle tries to achieve by log-linear measurement, log-linear measurement is according to experiment showed, that its error is no better than zero, and therefore its measuring accuracy is higher.
Brief description of the drawings
Fig. 1 is the schematic diagram of prior art;
Fig. 2 is schematic diagram of the present utility model.
Wherein: 1, measuring channel; 2, pressure gathering tube; 3, pressure pipe; 4, log-linear pressure-sensitive probe; 5, detect hole.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is further described.Following examples are only for the technical solution of the utility model is more clearly described, and can not limit protection domain of the present utility model with this.
As Fig. 1, shown in Fig. 2, a kind of log-linear xsect apparatus for measuring air quantity, comprise measuring channel 1, the center of described measuring channel 1 is provided with pressure gathering tube 2, described measuring channel 1 is radially provided with some log-linear pressure-sensitive probes 4 along it, described log-linear pressure-sensitive probe 4 positive convection cell directions offer five and detect hole 5, described detection hole 5 distributes along the length direction of described log-linear pressure-sensitive probe 4, the position in the detection hole 5 described in five is followed successively by 0.277R, 0.566R, 0.695R, 0.847R, 0.962R, wherein R is the radius of measuring channel 1, described log-linear pressure-sensitive probe 4 is connected with described pressure gathering tube 2, on described measuring channel 1, be vertically installed with pressure pipe 3, described pressure pipe 3 is connected with described pressure gathering tube 2, flow velocity in measuring channel 1 can be divided into 5 mean flow rate faces, 5 concentric circless as shown in Figure 2, the definite of this principle tries to achieve by log-linear measurement, log-linear measurement is according to experimental results show that, its error is no better than zero, the best bet of determining at present the mean flow rate of pipe stream under disturbed flow condition by this way, it is more accurate for positive/negative-pressure is measured, described log-linear pressure-sensitive probe 4 has three, and be evenly arranged in described measuring channel 1, thereby the differential pressure in Measurement accuracy measuring channel 1, measuring accuracy is improved greatly.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (2)
1. a log-linear xsect apparatus for measuring air quantity, it is characterized in that: comprise measuring channel, the center of described measuring channel is provided with pressure gathering tube, described measuring channel is radially provided with some log-linear pressure-sensitive probes along it, described log-linear pressure-sensitive pop one's head in positive convection cell direction offer five detect holes, described detection hole distributes along the length direction of described log-linear pressure-sensitive probe, the position in the detection hole described in five is followed successively by 0.277R, 0.566R, 0.695R, 0.847R, 0.962R, the radius that wherein R is measuring channel, described log-linear pressure-sensitive probe is connected with described pressure gathering tube, on described measuring channel, be vertically installed with pressure pipe, described pressure pipe is connected with described pressure gathering tube.
2. log-linear xsect apparatus for measuring air quantity as claimed in claim 1, is characterized in that: described log-linear pressure-sensitive probe has three, and is evenly arranged in described measuring channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420142462.2U CN203848879U (en) | 2014-03-27 | 2014-03-27 | Logarithmic liner cross section air volume measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420142462.2U CN203848879U (en) | 2014-03-27 | 2014-03-27 | Logarithmic liner cross section air volume measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203848879U true CN203848879U (en) | 2014-09-24 |
Family
ID=51561885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420142462.2U Expired - Lifetime CN203848879U (en) | 2014-03-27 | 2014-03-27 | Logarithmic liner cross section air volume measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203848879U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105334345A (en) * | 2015-11-10 | 2016-02-17 | 中国安全生产科学研究院 | Subway tunnel section wind speed measurement device |
| CN108709576A (en) * | 2018-06-05 | 2018-10-26 | 中国航发沈阳发动机研究所 | A kind of rake instrument |
-
2014
- 2014-03-27 CN CN201420142462.2U patent/CN203848879U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105334345A (en) * | 2015-11-10 | 2016-02-17 | 中国安全生产科学研究院 | Subway tunnel section wind speed measurement device |
| CN105334345B (en) * | 2015-11-10 | 2018-06-22 | 中国安全生产科学研究院 | subway tunnel section wind speed measuring device |
| CN108709576A (en) * | 2018-06-05 | 2018-10-26 | 中国航发沈阳发动机研究所 | A kind of rake instrument |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103808381B (en) | A kind of temperature influence eliminating method of transit-time ultrasonic flow meter | |
| BR112013018615B8 (en) | FLOW METER GAUGE, METHOD TO MEASURE A FLOW METER, AND, FLOW MEASUREMENT SYSTEM | |
| CN104197205A (en) | Pipe network blocking detecting device | |
| CN203443970U (en) | Direction controllable pitot tube | |
| CN104316117A (en) | Flow measuring device | |
| CN205300835U (en) | Flow flow resistance coefficient detection device of valve | |
| CN104614025A (en) | Large-diameter pipe flow monitoring device | |
| CN203848879U (en) | Logarithmic liner cross section air volume measuring device | |
| CN202256376U (en) | Assembly of medium and low-speed wind tunnel contraction section and flow measuring section | |
| CN104165664B (en) | Pitot bar integrated mass flow meter | |
| CN204007804U (en) | Liquid flowmeter detects self-calibrating device online | |
| CN204346498U (en) | A kind of Mine Ventilator wind speed, total head monitoring device | |
| CN202304962U (en) | Air tunnel type speed-area-method air flow calibration device | |
| CN104005974B (en) | A kind of Coal Mine Ventilator flow-measuring method based on pressure correlation method | |
| CN104792372A (en) | Wind measuring method for complex flow field roadway | |
| CN206470284U (en) | The measurement apparatus of gas in pipelines flow velocity | |
| CN106871968B (en) | Probe for measuring total pressure of total temperature of multiple points of subsonic flow field | |
| CN203981219U (en) | Wing serial sampling air flow sensor for variable air volume system | |
| CN105203189A (en) | Self-calibration method of fluid flowmeter online detection device | |
| CN204373728U (en) | Water level difference measuring self-recording device | |
| CN203259199U (en) | Deformation Venturi tube used for flow detection of mining main ventilation fan | |
| CN204902900U (en) | High temperature pitot crust flow sensor | |
| CN107816345A (en) | A kind of apparatus and method of well casing gas tolerance metering | |
| CN203534679U (en) | Correction system of orifice plate flow meter | |
| CN203011438U (en) | Gas-liquid two-phase flow pitotbar flow meter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140924 |
|
| CX01 | Expiry of patent term |