CN204514403U - A kind of differential pressure mass flowmeter for vortex street - Google Patents
A kind of differential pressure mass flowmeter for vortex street Download PDFInfo
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- CN204514403U CN204514403U CN201520063209.2U CN201520063209U CN204514403U CN 204514403 U CN204514403 U CN 204514403U CN 201520063209 U CN201520063209 U CN 201520063209U CN 204514403 U CN204514403 U CN 204514403U
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Abstract
The utility model discloses a kind of modified differential pressure mass flowmeter for vortex street, comprise direct piping, even speed tube differential pressure pick-up and vortex frequency sensor; Described direct piping inside is provided with even speed tube restricting element; The both sides of described even speed tube restricting element are respectively equipped with the even speed tube differential pressure pick-up and vortex frequency sensor that are communicated with direct piping; Described even speed tube differential pressure pick-up comprises the pressure obtaning device, valve group and the many reference amounts transmitter that connect successively, and described pressure obtaning device is communicated with the positive/negative-pressure side of described even speed tube restricting element; Described vortex frequency sensor comprises vortex detection probe and associated line, and described vortex detection probe is installed in direct piping, and is connected with many reference amounts transmitter by associated line extraction.This device is used for measurement gas mass of medium flow, and by measuring even speed tube differential pressure and vortex shedding frequency, extrapolate density and the quality of detected fluid, drag losses is less, and measuring accuracy is higher, and structure is simpler, and cost is lower.
Description
Technical field
The utility model relates to field of flow measurement, particularly relates to a kind of a kind of modified differential pressure mass flowmeter for vortex street for measuring gas or liquid medium mass rate in circular pipe.
Background technology
Mass rate refers in the unit interval, fluid passes through the fluid mass of closed conduct or open channel free area, unit: kg/ (m^2*h), kg/ (m^2*s), mass rate and volumetric flow rate (volume that unit interval fluid passes through) correspondence, can be expressed as the product of volumetric flow rate and fluid density.
The mass rate of current measurement fluid has direct method and indirect method two kinds of modes.Coriolis mass flowmeters is the Typical Representative of direct method, and fluid can produce a power to tube wall when the Bottomhole pressure rotated, and it is that Coriolis finds when the research hydraulic turbine in 1832, is called for short coriolis force.Mass flowmeter is based on coriolis force, two parallel T type vibration tubes are had at sensor internal, drive coil is equipped with at middle part, pick-up coil is equipped with at two ends, when the driving voltage that transmitter provides is added on drive coil, vibrating tube does oscillation cycle vibration, the fluid media (medium) of industrial process flows through the vibrating tube of sensor, coriolis force effect will be produced on vibration tube, make two vibration tube twisting vibrations, the pick-up coil being arranged on vibration tube two ends will produce two groups of different signals of phase place, these two signal difference and the proportional relation of liquid mass flow flowing through sensor.Machine solution calculates the mass rate flowing through vibration tube.When different media flows through sensor, the master oscillator frequenc of vibration tube is different, calculates Media density accordingly.Its precision is high, and function is strong, but complex structure, price are high, and to gas, the particularly measurement of low-pressure gas, because the coriolis force produced is more weak, measuring error is large.
By measuring fluid constituents, obtain fluid density, thus to obtain fluid mass be the mass flowmeter of indirect method, but will measure fluid constituents and need to use chromatograph, price is also very expensive, is not easy to apply.
In field of flow measurement, often need real-time detecting mixing gas, the mixed gas namely containing many components medium, as: dry gas, unstripped gas, rock gas, mixed gas, steam etc.; Because its component situation is complicated, conventional its mass rate of measurement device is adopted to be difficult to realize.Middle small-bore pipeline adopt the supporting proximate analysis instrument of volumetric displacement meter or on-line densimeter realize the method revised, expensive, should not adopt.
Summary of the invention
The present invention is directed to above-mentioned the deficiencies in the prior art, a kind of modified differential pressure mass flowmeter for vortex street being applicable to measurement gas medium is provided, by measuring even speed tube differential pressure and vortex shedding frequency, extrapolate density and the quality of detected fluid, drag losses is less, measuring accuracy is higher, and structure is simpler, and cost is lower.
For solving problems of the prior art, the concrete technical scheme of employing is:
A kind of modified differential pressure mass flowmeter for vortex street, comprises direct piping, even speed tube differential pressure pick-up and vortex frequency sensor; Described direct piping inside is provided with even speed tube restricting element; The both sides of described even speed tube restricting element are respectively equipped with the even speed tube differential pressure pick-up and vortex frequency sensor that are communicated with direct piping; Described even speed tube differential pressure pick-up comprises the pressure obtaning device, valve group and the many reference amounts transmitter that connect successively, and described pressure obtaning device is communicated with the positive/negative-pressure side of described even speed tube restricting element; Described vortex frequency sensor comprises vortex detection probe and associated line, and described vortex detection probe is installed in direct piping, and is connected with many reference amounts transmitter by associated line extraction.
Preferred scheme, described even speed tube restricting element is cylinder sheet.
Preferred scheme further, described direct piping two ends are provided with pipeline coupling flange.
By adopting such scheme, compared with prior art, its technique effect is modified differential pressure mass flowmeter for vortex street of the present utility model: adopt straight pipe type passage, be convenient to gaseous fluid and pass through; Even speed tube restricting element is located at direct piping inside, its two ends are provided with pressure obtaning device and vortex detection probe, when fluid flows through, pressure obtaning device obtains differential pressure value and vortex frequency simultaneously, the vortex detection vortex frequency detected of popping one's head in directly is sent in many reference amounts transmitter, the flow of fluid can be obtained according to the vortex frequency produced, and have nothing to do with the density of fluid; Again in conjunction with the time of measurement, can obtain quality and the flow of fluid, the structure of whole product is more simple, and drag losses is less, and measuring accuracy is higher, and cost is lower, is applicable to the mass flow measurement of gas medium.
Accompanying drawing explanation
Fig. 1 is the front elevation of differential pressure mass flowmeter for vortex street of the present invention;
Fig. 2 is the right side view of differential pressure mass flowmeter for vortex street of the present invention.
Embodiment
Below in conjunction with the embodiment shown in Fig. 1 and Fig. 2, the present invention is further illustrated:
As depicted in figs. 1 and 2:
A kind of differential pressure mass flowmeter for vortex street, comprises direct piping 1, even speed tube differential pressure pick-up 2 and vortex frequency sensor 3; Described direct piping 1 two ends are provided with pipeline coupling flange 5, and inside is provided with the even speed tube restricting element 4 of cylinder sheet; The both sides of described even speed tube restricting element 4 are respectively equipped with the even speed tube differential pressure pick-up 2 and vortex frequency sensor 3 that are communicated with direct piping 1; Described even speed tube differential pressure pick-up 2 comprises the pressure obtaning device 21, valve group 22 and the many reference amounts transmitter 23 that connect successively, and described pressure obtaning device 21 is communicated with the positive/negative-pressure side of described even speed tube restricting element 4; Described vortex frequency sensor 3 comprises vortex detection probe 31 and associated line 32, and described vortex detection probe 31 is installed in direct piping 1, and draws 32 by associated line and go out and be connected with many reference amounts transmitter 23.
The utility model modified differential pressure mass flowmeter for vortex street realizes the measurement of convection cell mass rate by following steps: detected gas medium enters in the utility model modified differential pressure mass flowmeter for vortex street with certain flow velocity through direct piping 1, through even speed tube restricting element 4, flow velocity increases herein, then flows out from direct piping 1.Because gas medium flow velocity in direct piping 1 changes, pressure obtaning device 21 obtains pressure difference, inputs many reference amounts transmitter 23 by measuring the differential pressure signal obtained through measuring valve group 22.Even speed tube restricting element 4 is arranged in direct piping 1, the fluid of high flow rate can produce the whirlpool of certain frequency when even speed tube restricting element 4, the frequency of vortex is only relevant to rate-of flow, and have nothing to do with Media density, then the vortex detection probe 31 be installed in direct piping 1 detects, the vortex frequency detected directly is input to many reference amounts transmitter 23 by associated line 32, calculates mass rate transmit output 4 ~ 20mA+HART signal by many reference amounts transmitter 23.
Can be measured, as density, quality and volume the fluid through this differential pressure mass flowmeter for vortex street in real time by many reference amounts transmitter 23.This product is applicable to various gas detect, as: dry gas (unstripped gas), rock gas, mixed gas, steam etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the scope of the invention, within the spirit and principles in the present invention all, any amendment done, equivalent to replace, be all included within protection scope of the present invention.
Claims (3)
1. a differential pressure mass flowmeter for vortex street, is characterized in that: it comprises direct piping, even speed tube differential pressure pick-up and vortex frequency sensor; Described direct piping inside is provided with even speed tube restricting element; The both sides of described even speed tube restricting element are respectively equipped with the even speed tube differential pressure pick-up and vortex frequency sensor that are communicated with direct piping; Described even speed tube differential pressure pick-up comprises the pressure obtaning device, valve group and the many reference amounts transmitter that connect successively, and described pressure obtaning device is communicated with the positive/negative-pressure side of described even speed tube restricting element; Described vortex frequency sensor comprises vortex detection probe and associated line, and described vortex detection probe is installed in direct piping, and is connected with many reference amounts transmitter by associated line extraction.
2. a kind of differential pressure mass flowmeter for vortex street according to claim 1, is characterized in that: described even speed tube restricting element is cylinder sheet.
3. a kind of differential pressure mass flowmeter for vortex street according to claim 1, is characterized in that: described direct piping two ends are provided with pipeline coupling flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520063209.2U CN204514403U (en) | 2015-01-29 | 2015-01-29 | A kind of differential pressure mass flowmeter for vortex street |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520063209.2U CN204514403U (en) | 2015-01-29 | 2015-01-29 | A kind of differential pressure mass flowmeter for vortex street |
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| CN204514403U true CN204514403U (en) | 2015-07-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107976222A (en) * | 2016-10-21 | 2018-05-01 | 中石化洛阳工程有限公司 | A kind of Pitot tube integrated gas mass flow measurement methods |
| CN113375901A (en) * | 2021-05-14 | 2021-09-10 | 东方电气集团科学技术研究院有限公司 | Method for testing vortex street frequency and flow velocity between tubes of flow-induced vibration of tube bundle structure |
-
2015
- 2015-01-29 CN CN201520063209.2U patent/CN204514403U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107976222A (en) * | 2016-10-21 | 2018-05-01 | 中石化洛阳工程有限公司 | A kind of Pitot tube integrated gas mass flow measurement methods |
| CN113375901A (en) * | 2021-05-14 | 2021-09-10 | 东方电气集团科学技术研究院有限公司 | Method for testing vortex street frequency and flow velocity between tubes of flow-induced vibration of tube bundle structure |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CP02 | Change in the address of a patent holder |
Address after: Jinshan District Fengjing town 201501 Shanghai Xinghao Road No. 7 Patentee after: SHANGHAI KEYONTECHS CO., LTD. Address before: Jinshan District Fengjing town Shanghai City No. 109 201501 Cao Lilu Building 1 room 101 Patentee before: SHANGHAI KEYONTECHS CO., LTD. |