CN220729345U - Large-caliber small-flow gas flow measuring device - Google Patents
Large-caliber small-flow gas flow measuring device Download PDFInfo
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- CN220729345U CN220729345U CN202322161190.2U CN202322161190U CN220729345U CN 220729345 U CN220729345 U CN 220729345U CN 202322161190 U CN202322161190 U CN 202322161190U CN 220729345 U CN220729345 U CN 220729345U
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- 238000005259 measurement Methods 0.000 claims abstract description 11
- 239000004429 Calibre Substances 0.000 claims 1
- 230000009471 action Effects 0.000 abstract description 5
- 239000012530 fluid Substances 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 description 19
- 230000005484 gravity Effects 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The utility model provides a large-caliber small-flow gas flow measuring device, when the gas flow is small, a drainage valve is closed, a gas main pipeline is closed, the measured gas completely flows through a small-caliber drainage tube, and a flow measuring module accurately measures the gas flow; when the gas flow is large, the drainage valve is automatically opened, the drainage valve is simultaneously equivalent to a throttling piece, pressure difference exists between fluid before and after the valve, part of gas flows through the drainage tube under the action of the pressure difference, the ratio of the gas flow in the drainage tube to the gas flow in the gas main pipeline is in one-to-one corresponding functional relation, the flow measurement module detects the gas flow in the drainage tube, and the total gas flow in the main pipeline can be obtained through the gas flow in the drainage tube. The initial flow of the flowmeter is far lower than that of the traditional flowmeter, and the flow of small-flow gas in a large-caliber pipeline can be accurately measured.
Description
Technical Field
The utility model relates to the field of flow measurement, in particular to a gas flowmeter.
Background
In industrial production, the gas flow in the pipeline is often required to be measured, the measurement range of the traditional gas flow meter is related to the caliber, the larger the caliber is, the larger the starting flow and the upper measurement limit are, and the larger the caliber flow meter such as DN200 vortex street flow meter can achieve 900 m in starting flow 3 And/h, the small flow gas cannot be accurately measured.
Part of pipelines in the industrial field, such as torch emptying pipelines, have caliber of more than DN800, the gas flow in the pipelines changes greatly, and the flow can exceed 500000 m during emergency emptying of the whole plant 3 /h, but in the case of non-emergency venting, the gas flow can be as low as less than 100m 3 And/h, at this time, the conventional flowmeter cannot achieve accurate measurement.
Disclosure of Invention
In order to solve the problems in the background technology, the utility model provides a large-caliber small-flow gas flow measuring device, the initial flow of which is far lower than that of the traditional flowmeter, and the flow of small-flow gas in a large-caliber pipeline can be accurately measured.
The technical scheme adopted by the utility model is as follows:
a large-caliber small-flow gas flow measuring device comprises a drainage tube, a drainage valve and a flow measuring module. The two ends of the drainage tube are connected with the gas main pipeline, the drainage valve is arranged on the gas main pipeline and positioned in the middle of the air inlet and the air outlet of the drainage tube, and the flow measuring module is arranged on the drainage tube.
According to the large-caliber small-flow gas flow measuring device, when the gas flow is small, the drainage valve is closed, the gas main pipeline is closed, the measured gas completely flows through the small-caliber drainage tube, and the flow measuring module accurately measures the gas flow; when the gas flow is large, the drainage valve is automatically opened, the drainage valve is simultaneously equivalent to a throttling piece, pressure difference exists between fluid before and after the valve, part of gas flows through the drainage tube under the action of the pressure difference, the ratio of the gas flow in the drainage tube to the gas flow in the gas main pipeline is in one-to-one corresponding functional relation, the flow measurement module detects the gas flow in the drainage tube, and the total gas flow in the main pipeline can be obtained through the gas flow in the drainage tube.
The beneficial effects are that: the large-caliber small-flow gas flow measuring device provided by the utility model can accurately measure the small-flow gas flow in the large-caliber pipeline, and has the advantages of wide measuring range, convenience in maintenance, low cost and the like.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Fig. 2 is a schematic structural view of a drainage valve according to the present utility model.
Fig. 3 is a schematic structural view of another drainage valve according to the present utility model.
Description of the embodiments
The technical scheme of the utility model is further described below with reference to the attached drawings and specific embodiments.
The large-caliber small-flow gas flow measuring device shown in fig. 1 comprises a drainage tube, a drainage valve and a flow measuring module. The two ends of the drainage tube are connected with the gas main pipeline, the drainage valve is arranged on the gas main pipeline and positioned in the middle of the air inlet and the air outlet of the drainage tube, and the flow measuring module is arranged on the drainage tube.
Specifically, the cross-sectional area of the draft tube is much smaller than the cross-sectional area of the main gas line, typically one percent.
The drainage valve shown in fig. 2 comprises a shell, a sealing cover and a limiting guide mechanism. The shell is arranged on the gas main pipeline, the sealing cover is connected with the limiting guide mechanism, and the limiting guide mechanism is fixedly arranged in the shell.
The drainage valve shown in fig. 3, on the basis of the drainage valve shown in fig. 2, the limit guide mechanism further comprises a spring and a baffle, one end of the spring is fixed on the sealing cover, the other end of the spring is fixed in the shell through the baffle, and in a natural state, the elastic force of the spring pushes the sealing cover to block the internal gas channel at the air inlet end of the shell.
According to the large-caliber small-flow gas flow measuring device, when the drainage valve shown in the figure 2 is selected, after the production is finished, the drainage valve has a fixed opening flow parameter value, when the inlet flow is smaller than the opening flow, the sealing cover is in a closed position due to the action of gravity, the gas main pipeline is closed, the measured gas completely flows through the drainage tube, and the flow measuring module accurately measures the gas flow.
When the gas flow is larger than the opening flow, the sealing cover is pushed by the gas flow to be automatically opened, and most of the gas flows through the gas main pipeline. Under the action of the sealing cover, a small part of gas is shunted to the drainage tube, and the flow measurement module accurately measures the shunted gas flow. The split gas flow and the flow in the gas main pipeline are in a functional relation, in actual production, the flow values corresponding to the split gas flow and the flow in the gas main pipeline are measured by a test method, an approximate functional formula can be deduced, and the accuracy of the approximate functional formula meets the measurement requirement through verification.
When the gas flow is changed from more than the opening flow to less than the opening flow, the air flow thrust borne by the sealing cover is insufficient to offset the gravity of the sealing cover, the sealing cover is restored to be closed again, the gas main pipeline is blocked, the gas completely flows through the drainage tube, and the flow measurement module accurately measures the gas flow.
In practical application, the larger the gas flow is, the larger the thrust acted by the gas flow on the sealing cover is, when the gas flow reaches a certain value, the thrust can exactly offset the gravity of the sealing cover and the movable part, and the flow value is the opening flow Qk of the flowmeter.
The calculation process of the opening flow rate is as follows:
the sum of the masses of the sealing cover and the movable part is M, and the gravity G is:(g is gravitational acceleration). The inner diameter of the shell is the same as that of the main gas pipeline, the radius of the shell is R, and the effective area S of the gas flow acting on the sealing cover is:。
it is easy to derive that when the flow reaches the opening flow, the pressure P of the air flow acting on the sealing cover is:。
from the bernoulli equation:(ρ is the gas density and V is the gas velocity).
Then, the gas flow rate V in the draft tube is:。
gas flow rate Q in drainage tube k The method comprises the following steps:(r is the inner radius of the drainage tube).
In the formula, R, R and ρ are constant values, pi and g are constants, and an appropriate flow rate Q is desired k The value is only needed to select the corresponding mass M value, and the material thickness of the sealing cover and the movable part can be changed as required during the production of the product, so that the mass of the sealing cover meets the design requirement.
Opening flow Q k The value of the flow meter is smaller than the maximum measuring range of the flow measuring module, so that the flow measuring module is prevented from being damaged due to overscan.
According to the large-caliber small-flow gas flow measuring device, the drainage valve shown in the figure 3 can be selected, the working process is the same, when the measured gas flow is smaller than the opening flow, the elastic force of the spring forces the sealing cover to be in the closing position so as to block the gas main pipeline, gas completely flows through the drainage tube, and the flow measuring module accurately measures the gas flow; when the gas flow is larger than the opening flow, the sealing cover is pushed by the gas flow to be automatically opened, and the gas flows normally.
In a natural state, the drainage valve shown in fig. 2 is in a closed position by the gravity action, and the drainage valve shown in fig. 3 is by the elastic force of a spring, so that the drainage valve shown in fig. 2 must be kept vertical in operation, and the drainage valve shown in fig. 3 can be mounted horizontally or at other angles more flexibly.
When the large-caliber small-flow gas flow measuring device of the drainage valve shown in fig. 3 is selected and the opening flow is calculated, the gravity G in the calculation formula is replaced by the elastic force of a spring, and the rest calculation steps are the same.
The foregoing detailed description of the embodiments will be provided for the purpose of illustration only, and modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model, and thus the utility model should not be limited to the embodiments shown herein but should be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The utility model provides a heavy-calibre low discharge gas flow measuring device, includes drainage tube, drainage valve, flow measurement module, and the both ends of drainage tube are connected with gaseous main line, and the drainage valve is installed on gaseous main line and is located the centre of drainage tube air inlet and gas outlet, and flow measurement module installs on the drainage tube.
2. The device of claim 1, wherein the draft tube is configured such that the gas to be measured flows completely through the draft tube when the draft valve is closed.
3. A large diameter small flow gas flow measuring device according to claim 1, wherein the draft tube has a gas flow cross-sectional area substantially smaller than the gas main line, typically about one percent or even less.
4. The device of claim 1, wherein the flow measuring module has a maximum measuring range greater than the opening flow.
5. The device of claim 1, wherein the diverter valve is automatically closed when the gas flow is less than the open flow.
6. The device of claim 1, wherein the diverter valve is automatically opened when the gas flow is greater than the open flow.
7. The device of claim 1, wherein the diverter valve automatically returns to the closed position when the gas flow rate changes from greater than the open flow rate to less than the open flow rate.
8. The device of claim 1, wherein the opening range of the diverter valve increases as the gas flow increases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322161190.2U CN220729345U (en) | 2023-08-11 | 2023-08-11 | Large-caliber small-flow gas flow measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322161190.2U CN220729345U (en) | 2023-08-11 | 2023-08-11 | Large-caliber small-flow gas flow measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220729345U true CN220729345U (en) | 2024-04-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322161190.2U Active CN220729345U (en) | 2023-08-11 | 2023-08-11 | Large-caliber small-flow gas flow measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220729345U (en) |
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2023
- 2023-08-11 CN CN202322161190.2U patent/CN220729345U/en active Active
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