CN113932864A - Vibration absorbing device of Coriolis force mass flowmeter - Google Patents
Vibration absorbing device of Coriolis force mass flowmeter Download PDFInfo
- Publication number
- CN113932864A CN113932864A CN202111337450.6A CN202111337450A CN113932864A CN 113932864 A CN113932864 A CN 113932864A CN 202111337450 A CN202111337450 A CN 202111337450A CN 113932864 A CN113932864 A CN 113932864A
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- CN
- China
- Prior art keywords
- vibration
- mass flowmeter
- vibration absorption
- flow measuring
- closed shell
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- 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.)
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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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8413—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
- G01F1/8418—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments motion or vibration balancing means
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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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention relates to a vibration absorption device of a Coriolis force mass flowmeter, which consists of a closed shell and a vibration absorption layer, wherein the vibration absorption layer is attached between the inner wall of the closed shell and the outer wall of a flow measuring pipe and is used for absorbing vibration wave energy transmitted when the flow measuring pipe vibrates. The invention adopts the high polymer polyurethane elastomer as the vibration absorption layer and is firmly adhered to the inner wall of the closed shell in a spraying mode, so that the vibration wave energy transmitted when the flow measuring tube vibrates can be effectively absorbed, and the closed shell does not reflect or reduce the vibration wave energy; and simultaneously absorbs the vibration energy caused by the vibration of the outside or the pipeline.
Description
Technical Field
The invention relates to a Coriolis force mass flowmeter, in particular to a vibration absorption device of the Coriolis force mass flowmeter.
Background
Currently, the coriolis mass flowmeter has become a flow meter with the most precise accuracy in flow measurement, and the accuracy of a general flow meter is as follows: liquids (water or oil) measure 0.5 and 1.0 grades and gases measure 1.0 and 1.5 grades. Coriolis force mass flowmeters can be accurate to liquid measurements on the order of 0.1 and 0.2 and gas measurements on the order of 0.2 and 0.3. And no movable or rotary part is arranged in the whole measuring circulation pipeline, the operation can be reliable for a long time, the requirement on a measured medium is low, and the requirement on front and rear straight pipe sections of a measuring pipeline is low. The primary task in the design and assembly of a coriolis mass flowmeter is to minimize or eliminate the effect of the vibrational amplitude of the flow measurement tube on the housing and other components (known in the art as "outfeed") while maximizing the amplitude of the flow measurement tube (which outputs a large measurable signal) for the same measured flow rate.
The Coriolis force mass flowmeter mainly comprises four parts, wherein one part is a supporting pipe (provided with a flange, a shunt body and the supporting pipe); the second is a flow measuring tube (comprising a flow measuring tube, a driving coil, a detection coil and a damping plate); thirdly, a closed shell; and the fourth is a meter head.
Due to the operating principle of the coriolis mass flowmeter itself, when the flow passes through, two flow measurement tubes arranged side by side are vibrated in opposite directions (opposite directions) by the coriolis force principle, and opposite displacement, velocity, acceleration and angular torsion are generated, and the flow can be detected by detecting the amount of change (any one of the amounts of change) and shaping the meter head.
The problems now lie in: one is as follows: to obtain a stronger signal (i.e., a larger variation), the vibration enhancement needs to be increased by the size and shape of the flow measurement tube. Therefore, the vibration of the Coriolis force mass flowmeter can cause the vibration of peripheral air, the vibration energy is further transmitted to the closed shell, then the flow measuring tube rebounds back, and the vibration energy is further superposed to the normal vibration motion of the flow measuring tube, namely the external transmission is increased, so that the normal vibration motion is deviated, and the measurement accuracy of the Coriolis force mass flowmeter is influenced. The second step is as follows: various vibration on the outside and the pipeline can be transmitted to the shell through the supporting tube and then transmitted to the flow measuring tube through the air in the inner closed space so as to influence the normal vibration motion of the flow measuring tube and further influence the measurement accuracy of the Coriolis force mass flow meter.
Disclosure of Invention
The present invention provides a vibration absorption device for Coriolis force mass flow rate, which is safe, reliable, simple in structure and easy to produce, and aims at the problem of outward transmission generated by the closed housing of the Coriolis force mass flow meter.
In order to achieve the purpose, the technical scheme of the invention is as follows: a vibration absorption device of Coriolis force mass flowmeter comprises a closed shell and a vibration absorption layer, wherein the vibration absorption layer is attached between the inner wall of the closed shell and the outer wall of a flow measurement pipe and is used for absorbing vibration wave energy transmitted when the flow measurement pipe vibrates.
Further, the thickness of the vibration absorption layer is 3-5 mm.
Furthermore, the vibration absorption layer is made of high polymer vibration absorption materials with vibration absorption functions.
Further, the high polymer vibration absorbing material is a high polymer polyurethane elastic material.
Further, the high polymer polyurethane elastic material is uniformly sprayed between the inner wall of the closed shell and the outer wall of the flow measuring pipe.
The invention has the advantages that: the high polymer polyurethane elastomer is used as a vibration absorption layer and firmly adhered to the inner wall of the closed shell in a spraying mode, so that the vibration wave energy transmitted when the flow measuring pipe vibrates can be effectively absorbed, and the closed shell does not reflect or reduce the vibration wave energy; and simultaneously absorbs the vibration energy caused by the vibration of the outside or the pipeline. The absorbed energy will be stored in the vibration absorbing material and converted into heat. Therefore, the problem that the accuracy of the Coriolis force mass flowmeter is influenced due to the fact that the normal work of the flow measuring tube is influenced because the vibration wave energy (generated when the vibration wave energy is from the work of the flow measuring tube) reflected by the closed shell returns to the flow measuring tube is effectively solved. And simultaneously, the influence of external or pipeline vibration on the measurement and accuracy of the Coriolis force mass flowmeter is also solved. I.e., absorption and elimination of so-called external transmission, thereby ensuring proper operation and high accuracy reliability and effectiveness, and safety of the coriolis mass flowmeter. The purpose of the invention is achieved.
Drawings
Fig. 1 is a front view of the vibration absorbing apparatus of the present invention;
FIG. 2 is a cross-sectional view of the vibration absorbing apparatus B-B of the present invention;
in the figure: the Coriolis force mass flowmeter comprises a closed shell, a 2-vibration absorption layer, a 3-flow measuring pipe I and a 4-flow measuring pipe II, wherein the closed shell is of the Coriolis force mass flowmeter.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in FIGS. 1 and 2, the vibration absorption device of Coriolis force mass flowmeter of the present invention is mainly composed of a closed housing 1 and a vibration absorption layer 2.
The invention is characterized in that a vibration absorption layer 2 made of vibration absorption materials is attached between the inner wall of a closed shell 1 and the outer wall of a flow measuring pipe 3 without changing the original design.
The vibration absorbing material is a high polymer material which can absorb vibration waves and prevent or reduce damage of mechanical vibration to components. High polymer vibration absorbing materials are one type of damping material. The vibration absorption principle is based on the viscoelasticityViscosity ofAnd the damping part dissipates the absorbed energy in the form of heat. The polymer, under dynamic stress, has a viscous deformation lagging behind the stress, and the tangent tg δ of the phase difference δ between them is calledLoss of powerThe tangent angle, which represents the ratio of the energy lost to the energy stored during deformation, i.e. the amount of damping of mechanical vibrations, or the amount of shock absorption, of a viscoelastic material (seeViscoelasticity of high polymer)。
In the invention, the high polymer polyurethane elastomer (or other high polymers with the vibration absorption function) is adopted to construct the vibration absorption layer in a spraying mode, the high polymer polyurethane elastomer is uniformly sprayed on the inner wall of the closed shell 1, and the thickness of the vibration absorption layer is 3-5 mm. The vibration absorption layer has the advantages of good vibration absorption effect, strong adhesion force of the vibration absorption layer and easy control of the thickness of the vibration absorption layer.
Claims (5)
1. A vibration absorbing device of Coriolis force mass flowmeter is characterized in that: the flow measuring tube is composed of a closed shell and a vibration absorption layer, wherein the vibration absorption layer is attached between the inner wall of the closed shell and the outer wall of the flow measuring tube and used for absorbing vibration wave energy transmitted when the flow measuring tube vibrates.
2. The vibration absorbing apparatus of a coriolis mass flowmeter of claim 1, wherein: the thickness of the vibration absorption layer is 3-5 mm.
3. The vibration absorbing apparatus of a coriolis mass flowmeter of claim 1, wherein: the vibration absorption layer is made of high polymer vibration absorption materials with vibration absorption functions.
4. The vibration absorbing apparatus of a coriolis mass flowmeter of claim 3, wherein: the high polymer vibration absorption material is a high polymer polyurethane elastic material.
5. The vibration absorbing apparatus of a coriolis mass flowmeter of claim 4, wherein: the high polymer polyurethane elastic material is uniformly sprayed between the inner wall of the closed shell and the outer wall of the flow measuring pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111337450.6A CN113932864A (en) | 2021-11-09 | 2021-11-09 | Vibration absorbing device of Coriolis force mass flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111337450.6A CN113932864A (en) | 2021-11-09 | 2021-11-09 | Vibration absorbing device of Coriolis force mass flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113932864A true CN113932864A (en) | 2022-01-14 |
Family
ID=79286597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111337450.6A Pending CN113932864A (en) | 2021-11-09 | 2021-11-09 | Vibration absorbing device of Coriolis force mass flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113932864A (en) |
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2021
- 2021-11-09 CN CN202111337450.6A patent/CN113932864A/en active Pending
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