CN202631017U - Plug-in flow measurement device applicable to low flow speed and large pipe diameter - Google Patents
Plug-in flow measurement device applicable to low flow speed and large pipe diameter Download PDFInfo
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- CN202631017U CN202631017U CN 201220313438 CN201220313438U CN202631017U CN 202631017 U CN202631017 U CN 202631017U CN 201220313438 CN201220313438 CN 201220313438 CN 201220313438 U CN201220313438 U CN 201220313438U CN 202631017 U CN202631017 U CN 202631017U
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- house steward
- measurement
- output channel
- static pressure
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Abstract
The utility model discloses a plug-in flow measurement device applicable to low flow speed and large pipe diameter. The plug-in flow measurement device comprises a straight-rod-shaped measurement main pipe, wherein an inner cavity of which the section is circular and an outer cavity of which the section is circular ring-shaped are formed in the measurement main pipe; a large Venturi pipe is connected to the front end of the measurement main pipe and perpendicular to the axis of the measurement main pipe; a small Venturi pipe is coaxially arranged in the large Venturi pipe; the front end of the outer cavity is closed; the front end of the inner cavity is communicated with a throat of the small Venturi pipe through a pressure guide channel; total pressure taking-out holes are formed in the wall of the outer cavity; the rear end of the measurement main pipe is connected with a pressure output device; the pressure output device is provided with a static pressure output channel and a total pressure output channel; the static pressure output channel is communicated with the inner cavity of the measurement main pipe; and the total pressure output channel is communicated with the outer cavity of the measurement main pipe. Compared with the prior art, the plug-in flow measurement device is large in pressure difference and high in measurement accuracy when measuring flow under the low pressure and at the low flow speed.
Description
Technical field
The utility model belongs to the flow measurement device technical field, is specifically related to a kind of insert type flow measuring device that is applicable to the low big caliber of flow velocity.
Background technology
At present; Many plug-in type pressure reduction type flow measurement devices of knowing have the even speed tube of rhombus, ellipse or round section, the perhaps modified product of even speed tube, and the theoretical foundation that this series products is measured is the single-point bernoulli's equation; Promptly obtain flow velocity, thereby extrapolate flow through measuring total differential static pressure.Lower at flow velocity, during like measurement low-pressure gas flow, differential pressure value is very little, when flow velocity is lower than 4.5m/s, almost can't measure.In addition; In the engineering practice, in order accurately to measure flow and the resolution that improves flow measurement, even for the tested pipeline of high flow rate; Also always hope to have bigger differential pressure; And conventional plug-in type differential pressure type flow measurement device is when gas flow measurement, and differential pressure value is generally less than 1kPa, is difficult to reach the purpose that obtains High Pressure Difference.
Summary of the invention
The purpose of the utility model provides a kind of insert type flow measuring device that is applicable to the low big caliber of flow velocity, and compared with prior art, when carrying out low pressure, low flow rate measurement, the pressure reduction of acquisition is big, and measuring accuracy is high.
The technical scheme that the utility model adopted is; A kind of insert type flow measuring device that is applicable to the low big caliber of flow velocity; It is characterized in that, comprise the measurement house steward of straight-bar shape, it is the outer chamber of annular for circular an inner chamber body and a cross section that measurement house steward's inside has a cross section; Connect at the front end of measuring house steward that axis is perpendicular to have a big Venturi tube, be coaxially arranged with little Venturi tube in the big Venturi tube, the front end sealing of outer chamber is provided with, and the front end of inner chamber body communicates with the throat of little Venturi tube through a pilot passage; Have stagnation pressure on the exocoel body wall and take out the hole; The rear end of measuring house steward is connected with the pressure output unit, and the pressure output unit has a static pressure output channel and a stagnation pressure output channel, and the static pressure output channel is connected with the inner chamber body of measuring house steward, and the stagnation pressure output channel is connected with the outer chamber of measuring house steward.
The integrated pressure withdrawing device of pressure output unit; The inside of integrated pressure withdrawing device has the interior circular hole and outer circular hole of concentric setting; Also have stagnation pressure delivery outlet and static pressure delivery outlet on the integrated pressure withdrawing device; Interior circular hole is connected and is connected with the static pressure delivery outlet through the static pressure passage with the inner chamber body of measuring house steward; Said outer circular hole is connected and is connected with the stagnation pressure delivery outlet through total pressure passageway with the outer chamber of measuring house steward, and interior circular hole, static pressure passage and static pressure delivery outlet constitute the static pressure output channel, and outer circular hole, total pressure passageway and stagnation pressure delivery outlet constitute the stagnation pressure output channel.
The static pressure adjusting and shutoff needle-valve that are used to regulate and turn-off the static pressure passage are installed on the integrated pressure withdrawing device, the stagnation pressure adjusting and shutoff needle-valve that are used to regulate and turn-off total pressure passageway are installed on the integrated pressure withdrawing device.
Measure between house steward and the integrated pressure withdrawing device and be connected through the thread seal connector.
The quantity that stagnation pressure takes out the hole is a plurality of and axially evenly distributing along the measurement house steward.
The beneficial effect of the utility model is: in light weight, flow resistance is little, can realize that online nothing is leaked to install or maintenance; With respect to other plug-in type differential pressure type flow measurement device, its differential pressure value is bigger under identical environment for use and operating mode, and accuracy of measurement is higher, has remarkable advantages when measuring at low pressure, low flow rate of gas rate-of flow.
Description of drawings
Fig. 1 is a kind of structural representation that is applicable to the insert type flow measuring device of the low big caliber of flow velocity of the utility model;
Fig. 2 is the structural representation of the integrated pressure withdrawing device in the utility model.
Wherein, 1. measure house steward, 2. big Venturi tube, 3. little Venturi tube; 4. stagnation pressure takes out hole, 5. thread seal connector, 6. integrated pressure withdrawing device, 7. static pressure delivery outlet; 8. stagnation pressure delivery outlet, 9. stagnation pressure adjusting and shutoff needle-valve, 10. static pressure adjusting and shutoff needle-valve.
Embodiment
As depicted in figs. 1 and 2, the utility model is a kind of to be applicable to the insert type flow measuring device of the low big caliber of flow velocity, comprises the measurement house steward 1 of straight-bar shape, and it is the outer chamber of annular for circular an inner chamber body and a cross section that the inside of measuring house steward 1 has a cross section.Connect at the front end of measuring house steward 1 that axis is perpendicular to have a big Venturi tube 2, be coaxially arranged with little Venturi tube 3 in the big Venturi tube 2, the front end sealing of outer chamber is provided with, and the front end of inner chamber body communicates with the throat of little Venturi tube 3 through a pilot passage.Have stagnation pressure on the exocoel body wall and take out hole 4, the quantity that stagnation pressure takes out hole 4 is a plurality of and axially evenly distributing along measurement house steward 1.The rear end of measuring house steward 1 is connected with the pressure output unit, and the pressure output unit has a static pressure output channel and a stagnation pressure output channel, and the static pressure output channel is connected with the inner chamber body of measuring house steward 1, and the stagnation pressure output channel is connected with the outer chamber of measuring house steward 1.
The integrated pressure withdrawing device 6 of pressure output unit is connected through thread seal connector 5 between measurement house steward 1 and the integrated pressure withdrawing device 6.The inside of integrated pressure withdrawing device 6 has the interior circular hole and outer circular hole of concentric setting; Also have stagnation pressure delivery outlet 8 and static pressure delivery outlet 7 on the integrated pressure withdrawing device 6; Interior circular hole is connected and is connected with static pressure delivery outlet 7 through the static pressure passage with the inner chamber body of measuring house steward 1; Outer circular hole is connected and is connected with stagnation pressure delivery outlet 8 through total pressure passageway with the outer chamber of measuring house steward 1; Interior circular hole, static pressure passage and static pressure delivery outlet 7 constitute the static pressure output channel, and outer circular hole, total pressure passageway and stagnation pressure delivery outlet 8 constitute the stagnation pressure output channel.
The static pressure adjusting and shutoff needle-valve 10 that are used to regulate and turn-off the static pressure passage are installed on the integrated pressure withdrawing device 6, the stagnation pressure adjusting and shutoff needle-valve 9 that are used to regulate and turn-off total pressure passageway are installed on the integrated pressure withdrawing device 6.
The utility model in use, stagnation pressure takes out hole 4 and comes flow path direction over against fluid, big Venturi tube 2 and little Venturi tube 3 all with the dead in line of tested pipeline installation section.Wherein, big 2 inducing actions of Venturi tube, the flow velocity that is used for quickening 3 li of little Venturi tubes reduces little Venturi tube 3 throat's static pressure, finally is connected with the inner chamber body of measuring house steward 1 through the pilot passage, to take out as static pressure.
The utility model measuring section effective length should be tested pipeline the half the of diameter of section is installed.The utility model can be used for big caliber (pipe of d >=200mm～4000mm), rectangle or regular cross section pipeline such as square.
Claims (5)
1. an insert type flow measuring device that is applicable to the low big caliber of flow velocity is characterized in that, comprises the measurement house steward (1) of straight-bar shape, and it is the outer chamber of annular for circular an inner chamber body and a cross section that said measurement house steward's (1) inside has a cross section; Connect at said measurement house steward's (1) front end that axis is perpendicular to have a big Venturi tube (2); Be coaxially arranged with little Venturi tube (3) in the said big Venturi tube (2); The front end sealing of said outer chamber is provided with, and the front end of said inner chamber body communicates through the throat of a pilot passage with little Venturi tube (3); Have stagnation pressure on the said exocoel body wall and take out hole (4); Said measurement house steward's (1) rear end is connected with the pressure output unit; Said pressure output unit has a static pressure output channel and a stagnation pressure output channel; Said static pressure output channel is connected with the inner chamber body of measuring house steward (1), and said stagnation pressure output channel is connected with the outer chamber of measuring house steward (1).
2. according to the described insert type flow measuring device that is applicable to the low big caliber of flow velocity of claim 1; It is characterized in that; The integrated pressure withdrawing device of said pressure output unit (6); The inside of said integrated pressure withdrawing device (6) has the interior circular hole and outer circular hole of concentric setting; Also have stagnation pressure delivery outlet (8) and static pressure delivery outlet (7) on the said integrated pressure withdrawing device (6); Circular hole is connected and is connected with static pressure delivery outlet (7) through the static pressure passage with the inner chamber body of measuring house steward (1) in said; Said outer circular hole is connected and is connected with stagnation pressure delivery outlet (8) through total pressure passageway with the outer chamber of measuring house steward (1), and said interior circular hole, static pressure passage and static pressure delivery outlet (7) constitute the static pressure output channel, and said outer circular hole, total pressure passageway and stagnation pressure delivery outlet (8) constitute the stagnation pressure output channel.
3. according to the described insert type flow measuring device that is applicable to the low big caliber of flow velocity of claim 2; It is characterized in that; The static pressure adjusting and shutoff needle-valve (10) that are used to regulate and turn-off the static pressure passage are installed on the said integrated pressure withdrawing device (6), the stagnation pressure adjusting and shutoff needle-valve (9) that are used to regulate and turn-off total pressure passageway are installed on the said integrated pressure withdrawing device (6).
4. according to claim 2 or the 3 described insert type flow measuring devices that are applicable to the low big caliber of flow velocity, it is characterized in that, be connected through thread seal connector (5) between said measurement house steward (1) and the integrated pressure withdrawing device (6).
5. according to the measurement mechanism of gas or fluid flow in claim 1, the large-scale circular section of the 2 or 3 described measurements pipeline, it is characterized in that the quantity that said stagnation pressure takes out hole (4) is a plurality of and axially evenly distributing along measurement house steward (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220313438 CN202631017U (en) | 2012-06-29 | 2012-06-29 | Plug-in flow measurement device applicable to low flow speed and large pipe diameter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220313438 CN202631017U (en) | 2012-06-29 | 2012-06-29 | Plug-in flow measurement device applicable to low flow speed and large pipe diameter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202631017U true CN202631017U (en) | 2012-12-26 |
Family
ID=47384210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220313438 Expired - Fee Related CN202631017U (en) | 2012-06-29 | 2012-06-29 | Plug-in flow measurement device applicable to low flow speed and large pipe diameter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202631017U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105043467A (en) * | 2015-08-12 | 2015-11-11 | 银川融神威自动化仪表厂(有限公司) | Low-pressure-drop super acceleration gauge |
-
2012
- 2012-06-29 CN CN 201220313438 patent/CN202631017U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105043467A (en) * | 2015-08-12 | 2015-11-11 | 银川融神威自动化仪表厂(有限公司) | Low-pressure-drop super acceleration gauge |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121226 Termination date: 20140629 |
|
| EXPY | Termination of patent right or utility model |