CN111397672A - Vortex street flowmeter for detecting differential pressure signal - Google Patents
Vortex street flowmeter for detecting differential pressure signal Download PDFInfo
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- CN111397672A CN111397672A CN202010249815.9A CN202010249815A CN111397672A CN 111397672 A CN111397672 A CN 111397672A CN 202010249815 A CN202010249815 A CN 202010249815A CN 111397672 A CN111397672 A CN 111397672A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
- G01F1/32—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow using swirl flowmeters
- G01F1/3209—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow using swirl flowmeters using Karman vortices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
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Abstract
The invention relates to the field of flow measurement, in particular to a vortex shedding flowmeter for detecting a differential pressure signal. A vortex street flowmeter for detecting differential pressure signals comprises an integrating instrument, an integrating instrument bracket, a vortex street meter body and a vortex generating body; the integrating instrument is used for calculating and displaying flow; the integrating instrument is connected to the integrating instrument bracket; the integrating instrument support is installed on a vortex street table body, a vortex generating body is arranged in the vortex street table body, and the vortex generating body is used for generating a differential pressure signal. The vortex shedding flowmeter of the invention breaks through the traditional vortex shedding flowmeter detection method, adopts an auxiliary means of a differential pressure method, and detects the tiny low-flow-speed fluid by measuring the tiny differential pressure change, namely a differential pressure signal, generated by the resistance from the front and the back of a vortex generating body, so that the vortex shedding flowmeter has the characteristics of low lower limit flow and wide range of the detected flow.
Description
Technical Field
The invention relates to the field of flow measurement, in particular to a vortex shedding flowmeter for detecting a differential pressure signal.
Background
The vortex shedding flowmeter is a volumetric flowmeter which is produced according to Karman vortex shedding principle and used for measuring the volume flow, standard condition volume flow or mass flow of gas, steam or liquid.
The vortex street flowmeter is mainly used for measuring the flow of large-caliber gas, liquid and steam medium fluid in industrial pipelines of various industries. Its advantages are low pressure loss, wide range of measuring range, high precision and no influence from fluid density, pressure, temp and viscosity. No movable mechanical parts are needed, so that the reliability is high, the maintenance amount is small, and the instrument parameters can be stable for a long time.
The vortex street flowmeter has the working principle that a vortex generating body is arranged in fluid, so that regular vortices are alternately generated on two sides of the vortex generating body, vortex rows are asymmetrically arranged at the downstream of the vortex generating body to generate a certain frequency, and the flow velocity can be obtained by a formula f (St v/(1-1.27D/D) D (St is a Strouhal number, is a dimensionless number and is related to the vortex generating body and a Reynolds number), v is the flow velocity, D is the front width of the generating body, and D is a nominal diameter).
In general, the output signal (frequency) of the vortex shedding flowmeter is not influenced by the change of the physical property and the composition of the fluid, and the instrument coefficient is only related to the shape and the size of the vortex generator and the Reynolds number. It has the advantages that: the structure is simple and firm, and the installation and maintenance are convenient; the device is suitable for various fluids, liquid, gas, steam and partial mixed phases; the precision is high, generally reaching about +/-1% R; the flow range is wide; the head loss is small; no zero drift exists; the price is relatively cheap; the disadvantages are that: the method is not suitable for the condition that the Reynolds number Re is less than 20000, and has limitation on the use of high viscosity, low flow rate and small caliber; the requirement on the environment is high, the place with vibration is avoided as much as possible, and a long straight pipe section is required on the upstream side; the lower the instrument coefficient, the lower the larger the caliber. The signal resolution is reduced, so the caliber is not too large, and the method is generally applied to DN 15-DN 300 mm.
The existing vortex shedding flowmeter has the defects that when fluid with low flow velocity flows through a vortex generating body, because the vortex amplitude is weak, a detection element cannot detect a signal, so that the fluid flow with small flow is difficult to detect.
Disclosure of Invention
In order to solve the technical problem, the invention provides a vortex shedding flowmeter for detecting a differential pressure signal, which comprises an integrating instrument, an integrating instrument bracket, a vortex shedding meter body and a vortex generating body, wherein the integrating instrument bracket is arranged on the vortex shedding meter body; the integrating instrument is used for calculating and displaying flow; the integrating instrument is connected to the integrating instrument bracket; the integrating instrument support is installed on a vortex street table body, a vortex generating body is arranged in the vortex street table body, and the vortex generating body is used for generating a differential pressure signal.
As a preferred technical solution, the integrating meter is connected to the integrating meter bracket through two connecting pipes.
In a preferred embodiment, the vortex generating body is vertically installed in the middle of the vortex street surface body in the radial direction.
As a preferred technical scheme, the vortex generating body is a hollow cavity, and the top of the vortex generating body is arranged at an opening on the vortex street surface body.
In a preferred embodiment, the vortex generator has a shape selected from the group consisting of a cylinder, a triangular column, a T-shaped column, and a rectangular column.
As a preferred technical scheme, pressure leading pipes are symmetrically arranged on two sides of the opening at the top of the vortex generating body and used for leading out a differential pressure signal.
As a preferable technical scheme, a differential pressure gauge is arranged above the pressure guiding pipe; and the differential pressure gauge is provided with a detection element for measuring a differential pressure signal.
As a preferable technical scheme, the shape of the pressure guiding pipe is selected from any one of a cylinder, a triangular column, a T-shaped column and a quadrangular column.
As a preferable technical scheme, the pressure guiding pipe is vertically arranged on the vortex street meter body, and the bottom of the pressure guiding pipe is communicated with the inside of the vortex street meter body.
As a preferred technical scheme, the vortex street table body is a circular straight pipe, the specification of the vortex street table body is the same as that of a process pipeline, and flanges are arranged at two ends of the vortex street table body and are used for being connected with the process pipeline.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a vortex shedding flowmeter for detecting a differential pressure signal, which breaks through the traditional vortex shedding flowmeter detection method, adopts an auxiliary means of a differential pressure method, and detects a tiny low-flow-speed fluid by measuring the tiny differential pressure change generated by resistance from the front and the back of a vortex generating body, namely a differential pressure signal, so that the vortex shedding flowmeter has the characteristics of low lower limit flow of the detected flow and wide range; compared with the existing flowmeter, the vortex street flowmeter provided by the invention has the advantages that the surface is provided with the special protective layer, various corrosive media can be isolated, the corrosion resistance is strong, and most of use conditions can be met.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly described below, the drawings described below are only some embodiments of the present invention, and it is obvious to those skilled in the art that other drawings can be obtained based on the drawings without creative efforts.
FIG. 1 is a schematic structural view of a vortex shedding flowmeter for detecting a differential pressure signal according to embodiment 1;
FIG. 2 is a schematic sectional view taken along line A-A of the vortex shedding flowmeter for detecting a differential pressure signal according to example 1;
the numbering in the figure is as follows:
1. an integrating instrument; 2. an integrating instrument support; 3. a differential pressure gauge; 4. a pressure guiding pipe; 5. a detection element; 6. a vortex generating body; 7. vortex street table body.
Detailed Description
The technical features of the technical solutions provided by the present invention are further clearly and completely described below with reference to the specific embodiments.
In order to solve the technical problem, the invention provides a vortex shedding flowmeter for detecting a differential pressure signal, which comprises an integrating instrument 1, an integrating instrument bracket 2, a vortex shedding meter body 7 and a vortex generating body 6; the integrating instrument 1 is used for calculating and displaying flow; the integrating instrument 1 is connected to the integrating instrument bracket 2; the integrating instrument support 2 is arranged on a vortex street table body 7, a vortex generating body 6 is arranged in the vortex street table body 7, and the vortex generating body 6 is used for generating a differential pressure signal.
In a preferred embodiment, the totalizer 1 is connected to the totalizer frame 2 by two connecting tubes.
The integrating instrument 1 can be connected to the integrating instrument bracket 2 through two connecting pipes, and can also be connected to the integrating instrument bracket 2 through other methods, such as bolt fixation, and connection by gluing, welding and the like; and then, the pressure difference meter 3 is connected with a cable, the output signal of the pressure difference meter 3 is transmitted to the signal input end of the integrating instrument 1, the integrating instrument 1 collects the signal and calculates the signal at the same time to obtain a flow value, and the flow value is displayed on a liquid crystal screen on the integrating instrument in a digital form to finish measurement.
In a preferred embodiment, the vortex generating body 6 is vertically installed in the middle of the vortex street table body 7 in the radial direction.
In a preferred embodiment, the vortex generating body 6 is a hollow cavity, and the top of the vortex generating body 6 is opened on the vortex street table body 7.
In a preferred embodiment, the vortex generating body 6 has a shape selected from any one of a cylinder, a triangular column, a T-shaped column, and a rectangular column.
The vortex generating body is typically made of stainless steel. The flow meter characteristics are related to the geometric shape and the installation position of the vortex generating body, and the incident flow surface must be axially vertical to the central axis. The vortex shedding flowmeter has the advantages that the installation positions of the vortex generators in the pipeline are strictly symmetrical, the upstream of each vortex generator needs to be provided with a straight pipe with the diameter of more than 10D, and the downstream of each vortex generator needs to be provided with a straight pipe with the diameter of more than 5D.
The cylindrical vortex generating body has unstable St at high flow speed, so that the cylindrical vortex generating body is improved into a slit or pressure guide hole form at present, and due to the existence of the pressure guide hole, when fluid passes through the pressure guide hole, the effect of sucking and blowing out is generated, and when a fluid boundary layer starts to separate on the cylindrical surface, the separation is inhibited on the sucking side; in the case of blowing, separation is promoted, so that the position of the fluid separation point is fixed, and the strouha number St can be relatively stabilized.
The triangular column type vortex generating body is a vortex generating body which is adopted in the prior vortex street flowmeter, can obtain a vortex stronger than a cylinder, and has a fixed boundary layer separation point, namely the Steroha number St of the triangular column type vortex generating body is relatively constant and is about 0.16. The relationship between vortex frequency and flow speed is f-0.16 u/d, wherein d is the width of the bottom side of the triangular prism.
In a more preferred embodiment, the vortex shedder 6 is triangular prism shaped.
In a more preferred embodiment, one apex angle of the triangular cross-section of the vortex shedder 6 is equally divided along the central axis.
In a preferred embodiment, pressure leading pipes 4 are symmetrically arranged on two sides of the top opening of the vortex generating body 6 and used for leading out a differential pressure signal.
In a preferred embodiment, a differential pressure gauge 3 is arranged above the pressure guiding pipe 4; the differential pressure gauge 3 is provided with a detection element 5 for measuring a differential pressure signal.
In a preferred embodiment, the shape of the pressure guiding tube 4 is selected from any one of a cylinder, a triangular column, a T-shaped column and a quadrangular column.
In a more preferred embodiment, the pressure guiding tube 4 is a hollow cylindrical stub.
In a preferred embodiment, the pressure guiding pipe 4 is vertically arranged on the vortex street table body 7, and the bottom of the pressure guiding pipe 4 is communicated with the inside of the vortex street table body 7.
In a preferred embodiment, the vortex street table body 7 is a circular straight pipe with the same specification as the process pipeline, and flanges are arranged at two ends of the vortex street table body 7 for connecting with the process pipeline.
The vortex shedding flowmeter of the invention breaks through the traditional vortex shedding flowmeter detection method, adopts an auxiliary means of a differential pressure method, and detects the tiny low-flow-speed fluid by measuring the tiny differential pressure change, namely a differential pressure signal, generated by the resistance from the front and the back of a vortex generating body, so that the vortex shedding flowmeter has the characteristics of low lower limit flow and wide range of the detected flow.
The differential pressure signal described here is formed by the resistance of the vortex generator in the vortex street table to the fluid, and the minute differential pressure signal can be detected by the differential pressure gauge, so that the flow rate at a lower flow rate is measured.
In a preferred embodiment, the surface of the vortex shedding flowmeter is provided with a protective layer.
The protective layer is an anti-corrosion layer with the thickness of 10-30 mu m; can be obtained by, for example: dispersing graphene in a solvent to form a suspension; mixing the suspension with epoxy resin, melamine formaldehyde resin, silane and glass flakes, and then mixing with a curing agent to obtain the anticorrosive coating; and depositing the anticorrosive paint on the surface of the flowmeter, and drying and curing.
The anticorrosive paint comprises, by weight, 1-3% of graphene, 2-5% of silane, 10-20% of melamine formaldehyde resin, 20-25% of epoxy resin, 8-15% of curing agent, 1-6% of glass flake and the balance of solvent, wherein the graphene is of a sheet structure, the sheet diameter is 5-10 mu m, the thickness is 3-10nm, and the graphene is purchased from XF021 of Xifeng nanometer materials science and technology corporation of Jiangsu, the silane is aminosilane KH550, the melamine formaldehyde resin is butylated melamine resin CYME L1158, the epoxy resin is Dow DER383 epoxy resin, the curing agent is polyetheramine D230 curing agent, and the solvent is one or a combination of more of tetrahydrofuran, butanone, ethyl acetate and toluene.
The present invention is described in detail below with reference to examples, which are provided for the purpose of further illustration only and are not to be construed as limiting the scope of the present invention, and the insubstantial modifications and adaptations thereof by those skilled in the art based on the teachings of the present invention will still fall within the scope of the present invention.
Example 1
Embodiment 1 provides a vortex shedding flowmeter for detecting a differential pressure signal, as shown in fig. 1 and 2; comprises an integrating instrument 1, an integrating instrument bracket 2, a vortex street surface body 7 and a vortex generating body 6; the integrating instrument 1 is used for calculating and displaying flow; the integrating instrument 1 is connected to the integrating instrument bracket 2; the integrating instrument support 2 is arranged on a vortex street table body 7, a vortex generating body 6 is arranged in the vortex street table body 7, and the vortex generating body 6 is used for generating a differential pressure signal.
The integrating instrument 1 is connected to the integrating instrument bracket 2 through two connecting pipes;
the vortex generating body 6 is vertically arranged in the middle of the vortex street table body 7 in the radial direction;
the vortex generating body 6 is a hollow cavity, and the top of the vortex generating body 6 is arranged on the upper opening of the vortex street surface body 7; the vortex generating body 6 is in a triangular prism shape; and a vertex angle on the triangular cross section of the vortex generating body 6 is uniformly divided along the central axis.
Pressure leading pipes 4 are symmetrically arranged on two sides of the opening at the top of the vortex generating body 6 and used for leading out a differential pressure signal;
a differential pressure gauge 3 is arranged above the pressure guiding pipe 4; the differential pressure gauge 3 is provided with a detection element 5 for measuring a differential pressure signal;
the pressure guiding pipe 4 is a hollow cylindrical short pipe;
the pressure guiding pipe 4 is vertically arranged on the vortex street meter body 7, and the bottom of the pressure guiding pipe 4 is communicated with the inside of the vortex street meter body 7;
the vortex street table body 7 is a circular straight pipe, the specification of the vortex street table body is the same as that of a process pipeline, and flanges are arranged at two ends of the vortex street table body 7 and are used for being connected with the process pipeline.
Further, a protective layer is arranged on the surface of the vortex shedding flowmeter, and the protective layer is an anti-corrosion layer and has the thickness of 20 microns; namely, the anti-corrosion coating is manufactured on each part and component of the instrument. And each part is made of corrosion-resistant metal or made of metal materials, so that the corrosion resistance problem of the throttling element is solved.
The corrosion protection coating can be obtained by, for example: dispersing graphene in a solvent to form a suspension; mixing the suspension with epoxy resin, melamine formaldehyde resin, silane and glass flakes, and then mixing with a curing agent to obtain the anticorrosive coating; and depositing the anticorrosive paint on the surface of the flowmeter, and drying and curing.
The anticorrosive paint comprises the following raw materials, by weight, 2% of graphene, 3% of silane, 15% of melamine formaldehyde resin, 23% of epoxy resin, 11% of a curing agent, 4% of glass flakes and the balance of a solvent, wherein the graphene is of a sheet structure, the sheet diameter is 5-10 mu m, the thickness is 3-10nm, the graphene is purchased from XF021 of Jiangsu Xiancheng nanometer material science and technology company, the silane is aminosilane KH550, the melamine formaldehyde resin is butylated melamine resin CYME L1158, the epoxy resin is Dow DER383 epoxy resin, the curing agent is polyetheramine D230 curing agent, and the solvent is butanone.
Silane is adopted in the coating to enable the dispersion of graphene to be more uniform and stable, the shielding performance of silane wrapping graphene to corrosion factors at an interface is improved, graphene molecules adopting a flaky special structure present a good micro-nano structure, and the structure can be firmly adsorbed in a network of resin and silane to be tightly bonded, so that the main friction acting force is born, and the coating is compact and wear-resistant.
The inventor has the surprise that when the butylated melamine resin CYME L1158 and the Dow DER383 epoxy resin are used in a matched mode, chemical bonds and hydrogen bond acting forces can be formed in the reaction in the mixing process, the action is stronger than the competitive action of water molecules, the diffusion rate of water on the metal surface can be reduced, active groups generated after the reaction and free siloxane coated on graphene further react to form a double-crosslinked network structure of silicon-oxygen-silicon and metal-oxygen-silicon structures, and the film forming compactness can be remarkably improved, and the corrosion resistance can be improved.
The raw material of the glass flake is generally medium alkali No. 5 glass, and the specific gravity of the medium alkali No. 5 glass is 2.5g/cm3(ii) a Bulk density<1.0g/cm3The thickness is 3-10 μm, the molecule and graphene are matched most properly after the glass flake is adopted, and the glass flake and graphene can be overlapped and arranged in parallel in a continuous sealing phase of resin molecules and silane to form a labyrinth sealing system, so that the permeation path of a corrosive medium is extended, and the stress during curing and forming can be greatly relaxed through two different sheet structures.
The following test was carried out on the corrosion-resistant vortex shedding flowmeter, and the test results were excellent.
Example 2
Arranging a protective layer on the surface of the vortex shedding flowmeter, wherein the protective layer is an anti-corrosion layer and has the thickness of 20 mu m; namely, the anti-corrosion coating is manufactured on each part and component of the instrument.
The corrosion protection coating can be obtained by, for example: dispersing graphene in a solvent to form a suspension; mixing the suspension with epoxy resin and silane, and then mixing with a curing agent to obtain the anticorrosive coating; and depositing the anticorrosive paint on the surface of the flowmeter, and drying and curing.
The anticorrosive paint comprises the following raw materials, by weight, 6% of graphene, 3% of silane, 38% of epoxy resin, 11% of a curing agent and the balance of a solvent; wherein, graphite alkene is sheet structure, and the sheet footpath: 5-10 μm, thickness: 3-10nm, and is purchased from XF021 of Xiancheng nano material science and technology Limited in Jiangsu; the silane is aminosilane KH550, and the epoxy resin is Dow DER383 epoxy resin; the curing agent is polyether amine D230 curing agent, and the solvent is butanone.
The following tests were carried out on the anti-corrosion vortex shedding flowmeter, and the test results were general.
Claims (10)
1. A vortex shedding flowmeter for detecting differential pressure signals is characterized by comprising an integrating instrument, an integrating instrument bracket, a vortex shedding meter body and a vortex generating body; the integrating instrument is used for calculating and displaying flow; the integrating instrument is connected to the integrating instrument bracket; the integrating instrument support is installed on a vortex street table body, a vortex generating body is arranged in the vortex street table body, and the vortex generating body is used for generating a differential pressure signal.
2. The vortex shedding flowmeter for detecting a differential pressure signal as set forth in claim 1, wherein said integrator is connected to an integrator support via two connecting pipes.
3. The vortex shedding flowmeter for detecting a differential pressure signal as set forth in claim 2, wherein said vortex generating body is installed vertically in a radial direction at a substantially middle portion of the vortex shedding body.
4. The vortex shedding flowmeter for detecting a differential pressure signal as claimed in claim 3, wherein the vortex generating body is a hollow cavity, and a top of the vortex generating body is provided with an opening on the vortex shedding body.
5. The vortex shedding flowmeter for detecting a differential pressure signal according to claim 4, wherein the vortex generating body has a shape selected from any one of a cylinder, a triangular prism, a T-shaped prism, and a rectangular prism.
6. The vortex shedding flowmeter for detecting differential pressure signals according to claim 5, wherein pressure drawing pipes are symmetrically arranged on two sides of the top opening of the vortex generating body and used for drawing out the differential pressure signals.
7. The vortex shedding flowmeter for detecting a differential pressure signal according to claim 6, wherein a differential pressure gauge is disposed above the pressure introduction pipe; and the differential pressure gauge is provided with a detection element for measuring a differential pressure signal.
8. The vortex shedding flowmeter for detecting a differential pressure signal as recited in claim 7, wherein the shape of the pressure guiding pipe is selected from any one of a cylinder, a triangular prism, a T-shaped prism, and a square prism.
9. The vortex shedding flowmeter for detecting a differential pressure signal as set forth in claim 8, wherein said pressure introduction pipe is vertically disposed on the vortex shedding meter body, and a bottom of the pressure introduction pipe communicates with a pipe of the vortex shedding meter body.
10. The vortex shedding flowmeter for detecting differential pressure signals according to any one of claims 1-9, wherein the vortex shedding meter body is a circular straight pipe with the same specification as a process pipeline, and flanges are arranged at two ends of the vortex shedding meter body for connecting with the process pipeline.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114459546A (en) * | 2021-04-12 | 2022-05-10 | 上海安钧智能科技股份有限公司 | Vortex shedding flowmeter with anti-corrosion function and used for detecting differential pressure signal |
-
2020
- 2020-04-01 CN CN202010249815.9A patent/CN111397672A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114459546A (en) * | 2021-04-12 | 2022-05-10 | 上海安钧智能科技股份有限公司 | Vortex shedding flowmeter with anti-corrosion function and used for detecting differential pressure signal |
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Application publication date: 20200710 |