WO1991003739A1 - Flow speed meter for channels or road tunnels - Google Patents
Flow speed meter for channels or road tunnels Download PDFInfo
- Publication number
- WO1991003739A1 WO1991003739A1 PCT/NO1990/000130 NO9000130W WO9103739A1 WO 1991003739 A1 WO1991003739 A1 WO 1991003739A1 NO 9000130 W NO9000130 W NO 9000130W WO 9103739 A1 WO9103739 A1 WO 9103739A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- channels
- differential pressure
- flow
- measurement
- air inlets
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/14—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid
Definitions
- the invention comprises a device of the type indicated in the introduction to Claim 1 for the measurement of air velocity and flow direction in channels or road tunnels where there is air flowing through and transient flow disturbances.
- Fan-driven air velocity meters are known for flow measurement applications in channels or road tunnels. These are exposed to mechanical wear. They are furthermore influenced by external disturbances such as transient air surges in a ventilation duct, that can be caused by doors being opened or closed. In. road tunnels, known velocity meters are influenced by passing vehicles that produce transient flow disturbances around the measurement device. Known measurement equipment therefore cannot function as satisfactory signal transmitters to control the fans and dampers that regulate the airstream in such channels etc.
- the main objective of the invention is to create a means of measuring air flow that is less exposed to wear than known turbine meters.
- a second objective is to create a flow meter that cannot be influenced inadvertently by transient flow disturbances in the channel where the device is located.
- a further objective is to create a flow meter that is constructed of simple, robust components.
- Fig. 1 shows a schematic lateral perspective of a straightforward design with an electronic delay element
- Fig. 2 shows a perspective sketch of a sensor element in ⁇ accordance with a further means of designing the invention
- Fig. 3 shows a schematic representation of velocity diagram for the sensor in Fig. 2.
- Fig. 1 shows a measurement sensor 11 with a basic design that is known in principle. This consists of a circular disc 12 that is located laterally to the direction of flow. This has a central sensor inlet 13 on each side with a pipe that is connected to a pressure transducer 14 for measuring the differential pressure. The output from the transducer 14 is connected to an electronic delay circuit 15 that transmits pressure signals that have been held constant for a certain period, this may be 5-20 seconds, for example. Because of the pressure difference between the two plate sides, the size of the plates and the channel cross section, certain relationships make it possible to take a measurement of the flow velocity. The delay circuit 15 prevents transient flow disturbances influencing the measurement results.
- a flow measurement meter is shown in Fig. 2 in a simplified design.
- Each plate has an external pressure inlet 19 located centrally that communicates by means of an axial connecting pipe 20 with a dual channel in a support pipe 21 running down from a pressure transducer 22.
- the space between the two pressure plates 17 and 18 i ⁇ indicated by reference number 23.
- P'ig. 3 illustrates a flow diagram for half of the flow measurement sensor depicted in Fig. 2.
- An eddy 24 is formed in the space between the two plates 17 and 18, which is uninfluenced by transient flow disturbances. Thus the pressure conditions are left largely unchanged, this enable the pressure measurement to be held constant during a brief period of disturbance. If there is a lasting change in direction, the eddy will be influenced which will affect th differential pressure between the two pressure plates.
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
- Measuring Fluid Pressure (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Road Signs Or Road Markings (AREA)
Abstract
Device for the measurement of flow velocity in channels or road tunnels, where a sensor (11) is used to register the differential pressure. This comprises a plate-shaped organ (12) that is located at a right angle to the flow direction in the channel with air inlets (13) for the differential pressure measurements on opposite sides. An electronic delay circuit (15) enables short-term changes in the measurement results to be suppressed so that transient changes in the direction of flow do not alter the measurement results.
Description
Flow speed meter for channels or road tunnels
The invention comprises a device of the type indicated in the introduction to Claim 1 for the measurement of air velocity and flow direction in channels or road tunnels where there is air flowing through and transient flow disturbances.
Background
Fan-driven air velocity meters are known for flow measurement applications in channels or road tunnels. These are exposed to mechanical wear. They are furthermore influenced by external disturbances such as transient air surges in a ventilation duct, that can be caused by doors being opened or closed. In. road tunnels, known velocity meters are influenced by passing vehicles that produce transient flow disturbances around the measurement device. Known measurement equipment therefore cannot function as satisfactory signal transmitters to control the fans and dampers that regulate the airstream in such channels etc.
Objectives.
The main objective of the invention is to create a means of measuring air flow that is less exposed to wear than known turbine meters. A second objective is to create a flow meter that cannot be influenced inadvertently by transient flow disturbances in the channel where the device is located. A further objective is to create a flow meter that is constructed of simple, robust components.
Principles of the invention The main objective of the invention can be achieved by designing a device in accordance with the description given in the characterizing part of Claim 1.
Other advantageous aspects of the invention are indicated in the subsidiary claims. A particularly advantageous feature is the design stated in Claim 3 which reduces the number of components.
Example
The drawings illustrate two means of designing the invention, where
Fig. 1 shows a schematic lateral perspective of a straightforward design with an electronic delay element,
Fig. 2 shows a perspective sketch of a sensor element in ~ accordance with a further means of designing the invention, while
Fig. 3 shows a schematic representation of velocity diagram for the sensor in Fig. 2.
Fig. 1 shows a measurement sensor 11 with a basic design that is known in principle. This consists of a circular disc 12 that is located laterally to the direction of flow. This has a central sensor inlet 13 on each side with a pipe that is connected to a pressure transducer 14 for measuring the differential pressure. The output from the transducer 14 is connected to an electronic delay circuit 15 that transmits pressure signals that have been held constant for a certain period, this may be 5-20 seconds, for example. Because of the pressure difference between the two plate sides, the size of the plates and the channel cross section, certain relationships make it possible to take a measurement of the flow velocity. The delay circuit 15 prevents transient flow disturbances influencing the measurement results. If, on the other hand, there are lasting disturbances in the air flow in a road tunnel caused by piston traffic for instance, registrations of changes in the flow direction will be made that may activate fans or dampers. This could be desirable for numerous reasons such as the removal of exhaust fumes.
A flow measurement meter is shown in Fig. 2 in a simplified design. Here, there are two pressure plates 17 and 18 that are located parallel to each other at a distance of approximately 1.5 times the diameter of the plates. Each plate has an external pressure inlet 19 located centrally that communicates by means of an axial connecting pipe 20 with a dual channel in a support pipe 21 running down from a
pressure transducer 22. The space between the two pressure plates 17 and 18 iε indicated by reference number 23.
P'ig. 3 illustrates a flow diagram for half of the flow measurement sensor depicted in Fig. 2. An eddy 24 is formed in the space between the two plates 17 and 18, which is uninfluenced by transient flow disturbances. Thus the pressure conditions are left largely unchanged, this enable the pressure measurement to be held constant during a brief period of disturbance. If there is a lasting change in direction, the eddy will be influenced which will affect th differential pressure between the two pressure plates.
Claims
1. Device for the measurement of flow velocity in channels or road tunnels, where a sensor (11) is used to register the differential pressure which enables the velocity to be determined, characterized by the device comprising a plate-shaped organ (12) that is located at a right angle to the direction of the channel with air inlets (13) for the differential pressure measurements on opposite sides, and further comprising a means (15) of suppressing impulses on the sensor that have a duration of less than 5-20 seconds.
2. Device as claimed in Claim 1, characterized by this comprising an electronic delay circuit (15) that suppresses short-term changes in the measurement results.
3. Device as claimed in Claim 1, characterized by this comprising two mutually parallel circular pressure plates (17,18) with external air inlets and a cylindrical space (23) between them.
4. Device as claimed in Claim 3, characterized by the distance between the pressure plates being approximately 1.5 times the diameter of the plates.
5. Device as claimed in Claims 3 or 4, characterized by the two pressure plates (17, 18) being linked to a central supporting pipe (20) the ends of which form the air inlets for the differential pressure measurements.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO893448 | 1989-08-29 | ||
| NO893448A NO168328C (en) | 1989-08-29 | 1989-08-29 | SPEED METER WITH DIRECTION INDICATOR FOR ROAD Tunnels |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1991003739A1 true WO1991003739A1 (en) | 1991-03-21 |
Family
ID=19892352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/NO1990/000130 WO1991003739A1 (en) | 1989-08-29 | 1990-08-17 | Flow speed meter for channels or road tunnels |
Country Status (2)
| Country | Link |
|---|---|
| NO (1) | NO168328C (en) |
| WO (1) | WO1991003739A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000075674A1 (en) * | 1999-06-02 | 2000-12-14 | The University Of British Columbia | Differential pressure velocimeter with probe body having disk shape |
| DE10359540A1 (en) * | 2003-12-17 | 2005-07-14 | Tlt-Turbo Gmbh | Device and method for determining the flow velocity |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1056513A (en) * | 1910-02-12 | 1913-03-18 | Gen Electric | Meter for measuring elastic fluids. |
| US2687645A (en) * | 1950-03-02 | 1954-08-31 | Askania Regulator Co | Differential pressure flow rate measurement device |
| US4008611A (en) * | 1975-07-01 | 1977-02-22 | S. P. Kinney Engineers, Inc. | Fluid flow measuring apparatus |
| GB1574702A (en) * | 1977-01-10 | 1980-09-10 | Tekflo Ltd | Fluid flow measuring assembly |
| US4290315A (en) * | 1979-01-25 | 1981-09-22 | Fincoil-Teollisuus Oy | Apparatus for determining the differential pressure and the volumetric fluid flow in a conduit |
| US4290314A (en) * | 1979-04-09 | 1981-09-22 | Rosemount Inc. | Target flowmeter |
| WO1983003896A1 (en) * | 1982-04-23 | 1983-11-10 | Stifab Ab | Measurement unit for determining gas flow through a conduit and measuring means designed to be included in such a measuring unit |
| SE434435B (en) * | 1979-11-07 | 1984-07-23 | Stifab Ab | Measuring device for determining gas flow through ducts and pipes and use of such measuring device as a measurement indicator for air flow regulation |
| EP0255056A2 (en) * | 1986-07-28 | 1988-02-03 | Yamatake-Honeywell Co. Ltd. | Method for measuring the speed of a gas flow |
-
1989
- 1989-08-29 NO NO893448A patent/NO168328C/en unknown
-
1990
- 1990-08-17 WO PCT/NO1990/000130 patent/WO1991003739A1/en unknown
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1056513A (en) * | 1910-02-12 | 1913-03-18 | Gen Electric | Meter for measuring elastic fluids. |
| US2687645A (en) * | 1950-03-02 | 1954-08-31 | Askania Regulator Co | Differential pressure flow rate measurement device |
| US4008611A (en) * | 1975-07-01 | 1977-02-22 | S. P. Kinney Engineers, Inc. | Fluid flow measuring apparatus |
| GB1574702A (en) * | 1977-01-10 | 1980-09-10 | Tekflo Ltd | Fluid flow measuring assembly |
| US4290315A (en) * | 1979-01-25 | 1981-09-22 | Fincoil-Teollisuus Oy | Apparatus for determining the differential pressure and the volumetric fluid flow in a conduit |
| US4290314A (en) * | 1979-04-09 | 1981-09-22 | Rosemount Inc. | Target flowmeter |
| SE434435B (en) * | 1979-11-07 | 1984-07-23 | Stifab Ab | Measuring device for determining gas flow through ducts and pipes and use of such measuring device as a measurement indicator for air flow regulation |
| WO1983003896A1 (en) * | 1982-04-23 | 1983-11-10 | Stifab Ab | Measurement unit for determining gas flow through a conduit and measuring means designed to be included in such a measuring unit |
| EP0255056A2 (en) * | 1986-07-28 | 1988-02-03 | Yamatake-Honeywell Co. Ltd. | Method for measuring the speed of a gas flow |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000075674A1 (en) * | 1999-06-02 | 2000-12-14 | The University Of British Columbia | Differential pressure velocimeter with probe body having disk shape |
| US6571645B1 (en) | 1999-06-02 | 2003-06-03 | Sheldon I. Green | Differential pressure velocimeter with probe body having disk shape |
| DE10359540A1 (en) * | 2003-12-17 | 2005-07-14 | Tlt-Turbo Gmbh | Device and method for determining the flow velocity |
Also Published As
| Publication number | Publication date |
|---|---|
| NO168328C (en) | 1992-02-05 |
| NO893448D0 (en) | 1989-08-29 |
| NO168328B (en) | 1991-10-28 |
| NO893448L (en) | 1991-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3564915A (en) | Current meter or flow meter | |
| AU609861B2 (en) | Fluid metering system | |
| GEP20001926B (en) | Method and Device for Measuring of Fluid Flow | |
| ES2186702T3 (en) | MEASUREMENT SYSTEM. | |
| US5095760A (en) | Vortex flowmeter with dual sensors | |
| US3705534A (en) | Fluidic flow sensing method and apparatus | |
| EP0171937B1 (en) | Flow meter | |
| US5945608A (en) | Hall effect fluid flow switch and flow meter | |
| US6435036B1 (en) | Vortex flow meter | |
| US3443432A (en) | Flowmeter | |
| WO1991003739A1 (en) | Flow speed meter for channels or road tunnels | |
| SE441704B (en) | DEVICE FOR DETERMINING THE PRESSURE DIFFERENCE AND VOLYMETRIC FLUID FLOW IN A PIPE | |
| US5767419A (en) | Hall effect fluid flow switch and flow meter | |
| US4346605A (en) | Magnetic flowmeter for electrically conductive liquid | |
| US2575492A (en) | Flow-measuring apparatus | |
| AU5200399A (en) | Device for measuring the volume flow of a fluid in a pipe | |
| KR910012666A (en) | Devices for measuring displacement of inductive transducers and movable members | |
| JPS60502228A (en) | Device for measuring the liquid part of a two-phase flow of gas and liquid | |
| JPS5829853B2 (en) | Mass flow measuring device | |
| JP3144986B2 (en) | Flowmeter | |
| GB1583490A (en) | Apparatus for measuring the flow rate of a medium | |
| US3455161A (en) | Meter for measuring unsteady fluid flow | |
| US3365955A (en) | Fluid angular rate sensor | |
| WO1995005581A1 (en) | Closely coupled, dual turbine volumetric flow meter | |
| US4756196A (en) | Flow measuring apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AK | Designated states |
Kind code of ref document: A1 Designated state(s): CA JP SU US |
|
| AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB IT LU NL SE |
|
| NENP | Non-entry into the national phase |
Ref country code: CA |