WO1999047839A1 - Flow control device for ducts - Google Patents
Flow control device for ducts Download PDFInfo
- Publication number
- WO1999047839A1 WO1999047839A1 PCT/FI1999/000160 FI9900160W WO9947839A1 WO 1999047839 A1 WO1999047839 A1 WO 1999047839A1 FI 9900160 W FI9900160 W FI 9900160W WO 9947839 A1 WO9947839 A1 WO 9947839A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- control
- control device
- gear wheel
- leaves
- outer circumference
- Prior art date
Links
- 230000009467 reduction Effects 0.000 claims abstract description 8
- 238000010276 construction Methods 0.000 description 6
- 238000006722 reduction reaction Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/03—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with a closure member in the form of an iris-diaphragm
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
- F24F13/105—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers composed of diaphragms or segments
Definitions
- the present invention relates to a flow control device for ducts, said control device operating based on the iris-diaphragm principle and includ-ing an annular housing with pivotally rotatable control leaves mounted therein and a rotating control ring adapted to control the position of said control leaves, and said flow control device further having a motor mounted thereon capable of moving said control ring and therethrough, said control leaves.
- the controlled flow may be, e.g., a gaseous fluid such as air.
- a gaseous fluid such as air.
- Different types of control devices can be employed for air flow rate measurement and control.
- a simple control device comprises a rotatable damper placed inside a duct, whereby the rotation of the damper serves to control the cross-sectional flow area of duct and thus the air flow rate through the duct.
- One drawback of this kind of damper is that the air flow rate control also changes the direction of the air flow.
- FI patent publication no. 50,184 discloses a different type of air flow con- troi device known as an iris damper comprising an annular housing formed by two adjacently mounted halves.
- a rotatable con-trol ring and the control leaves of the iris diaphragm are adapted between said halves.
- the control leaves are rotatably mounted by their one ends on pivot pins attached to one half of the annular damper housing.
- the other ends of the control leaves have pegs adapted to slidably move in radially expanding slots made on the control ring.
- the rotation of the control ring forces the iris orifice formed by the shaped control leaves to constrict or open as required.
- the air flow control device is characterized in that
- the accuracy of flow rate control is improved be- cause the prior-art linkage mechanisms can be disposed with. Resulting- ly, mechanical play is reduced and calibration accuracy of flow rate is improved.
- the flow rate adjuster i.e., the control shaft end nut in prior-art constructions
- the retaining friction of the control shaft can be smaller, thus permitting the use of a control motor of lower output rating. Also this feature is one of those imparting the device a longer service life.
- a preferred embodiment of the invention in characterized in that there is mounted a potentiometer on the drive shaft of the gear wheel to the end of sensing the position of the gear wheel.
- the potentiometer serves to provide a realtime indication of the actual control position of the damper.
- control motor, reduction gear, control gear wheel and position-indicating potentiometer are integrated into a compact unit which is adapted into a casing, whereby said unit with its casing can be mounted detachably on the housing of the flow control device.
- the benefit of the integrated actuator construction is a smaller size. Additionally, the serviceability of the device is improved as said integrated actuator motor unit can be readily dismounted from the damper housing and replaced by a new set.
- Figure 1 shows a side view of a flow duct iris damper equipped with a control motor unit according to the invention
- Figure 2 shows a section on lines A-A of Fig. 1;
- Figure 3 shows a top view of the structure of Fig. 1 ;
- Figure 4 shows a top view of the control ring and control leaves of the iris damper.
- Fig. 1 denoted by reference numeral 1 a portion of a flow duct, particularly an air flow duct.
- the duct is provided with an iris-diaphragm type flow control device, whose housing is denoted by reference numeral 8 in the diagram.
- the internal con-struc-tion of the flow control device may be, e.g., similar to the iris damper dis-closed in FI Pat. No. 50,184 with the exception of the damper control technique employed herein.
- the iris damper according to the in-ven-tion is namely equipped with a control motor unit 2 comprising a motor 3, reduc-tion gear 4, a gear wheel 5 and a position-indicating poten-tiometer 6.
- the control motor unit 2 is detachably mounted on the iris damper housing 8 as shown in the sectional view of Fig. 2 taken on lines A-A and is ex-ter-nally protected by a casing 7. A more detailed illustration of the control motor unit is also shown in Fig. 2.
- the outer perimeter of the iris damper housing 8 is provided with an opening at the gear wheel 5 thus per-mitting the gear wheel teeth to mesh with toothing 10 made on the outer pehm-eter of the iris damper control ring 9 (cf. Fig. 4).
- the gear wheel 5 is located chiefly outside the damper housing as can be seen from Fig. 2.
- the flow rate control by means of the iris damper is implemented according to the invention so that the output shaft of the motor 3 rotates via the output shaft 11 of the reduction gear 4 the meshing gear wheel 5 that in turn rotates the control ring 9.
- the control leaves 12 of the iris damper are moved in a conventional manner so as to increase or constrict the orifice 13 of the iris damper, depending on the direction of rotation of the control ring.
- the potentiometer mounted on the shaft of the gear wheel (which may be the output shaft of the reduction gear, as well), indicates the actual posi- tion of the iris damper control ring thus facilitating an extremely accurate control of the damper orifice.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Electrically Driven Valve-Operating Means (AREA)
- Air-Flow Control Members (AREA)
- Flow Control (AREA)
Abstract
The present invention relates to a flow control device for ducts, said control device operating based on the iris-diaphragm principle and including an annular housing (8) having rotatably interleaving control leaves (12) adapted therein and a rotatable control ring (9) arranged to control the position of said leaves, and said flow control device further having mounted thereon a motor (3) adapted to move said control ring (9) and thus said control leaves connected thereto. The invention is implemented by providing a portion of the outer circumference of the control ring (9) with toothing and the outer circumference of the annular damper housing (8) with an opening such that a gear wheel (5), which is mounted at said opening so as to extend partially outside the outer circumference of said annular damper housing, can have its teeth engaging with the toothing of the outer circumference of the control ring (9), and by further connecting the shaft (11) of the gear wheel (5) via the reduction gear to the control motor (3).
Description
Flow control device for ducts
The present invention relates to a flow control device for ducts, said control device operating based on the iris-diaphragm principle and includ-ing an annular housing with pivotally rotatable control leaves mounted therein and a rotating control ring adapted to control the position of said control leaves, and said flow control device further having a motor mounted thereon capable of moving said control ring and therethrough, said control leaves.
The controlled flow may be, e.g., a gaseous fluid such as air. Different types of control devices can be employed for air flow rate measurement and control. A simple control device comprises a rotatable damper placed inside a duct, whereby the rotation of the damper serves to control the cross-sectional flow area of duct and thus the air flow rate through the duct. One drawback of this kind of damper is that the air flow rate control also changes the direction of the air flow.
FI patent publication no. 50,184 discloses a different type of air flow con- troi device known as an iris damper comprising an annular housing formed by two adjacently mounted halves. A rotatable con-trol ring and the control leaves of the iris diaphragm are adapted between said halves. The control leaves are rotatably mounted by their one ends on pivot pins attached to one half of the annular damper housing. The other ends of the control leaves have pegs adapted to slidably move in radially expanding slots made on the control ring. Thus, the rotation of the control ring forces the iris orifice formed by the shaped control leaves to constrict or open as required.
Conventionally, the control of the flow orifice cross sec-tion in an iris damper has been accomplished by manual tech-niques requiring, e.g., use of a wrench for rotating a control shaft end nut placed on the exterior surface of the annu-lar damper housing, whereby the rotation of the shaft by the nut at the shaft end fur-ther turns the toothed control ring that actu- ates control leaves. The toothing is made on the inner circum-ference of the control ring.
Automation of the iris control has been attempted by means of a separate motor connected via a complicated linkage mechanism to the control shaft end. In practice, however, such linkage mechanisms have been found short-lived due to the high torque needed. This is because of safety reg- ula-tions requiring the control shaft to be frictionally preloaded so tight as to prevent manual tampering of the adjustment nut by fingers. Also the control accuracy is com-pro-mised by the slack of the linkage mechanism.
It is an object of the present invention to provide a motor-actuated iris damper with a more compact construction, higher operating reliability, more precise controllability and easier maintenance over the performance of prior-art constructions. The air flow control device according to the invention is characterized in that
- a portion of the outer circumference of the control ring is provided with toothing;
- the outer circumference of the annular damper housing is provided with an opening;
- in said opening, so as to extend partially outside the outer circum-ference of said annular damper housing, there is mounted a gear wheel having its teeth adapted to engage with the toothing of the outer circumference of said control ring, and
- the shaft of said gear wheel is connected via reduction gear to a control motor.
By virtue of the invention, the accuracy of flow rate control is improved be- cause the prior-art linkage mechanisms can be disposed with. Resulting- ly, mechanical play is reduced and calibration accuracy of flow rate is improved. Inasmuch the flow rate adjuster (i.e., the control shaft end nut in prior-art constructions) is now concealed, the retaining friction of the control shaft can be smaller, thus permitting the use of a control motor of lower output rating. Also this feature is one of those imparting the device a longer service life.
A preferred embodiment of the invention in characterized in that there is mounted a potentiometer on the drive shaft of the gear wheel to the end of sensing the position of the gear wheel. Thus, the potentiometer serves to provide a realtime indication of the actual control position of the damper.
Another preferred embodiment of the invention is character-ized in that the control motor, reduction gear, control gear wheel and position-indicating potentiometer are integrated into a compact unit which is adapted into a casing, whereby said unit with its casing can be mounted detachably on the housing of the flow control device. The benefit of the integrated actuator construction is a smaller size. Additionally, the serviceability of the device is improved as said integrated actuator motor unit can be readily dismounted from the damper housing and replaced by a new set.
In the following, the invention will be described in great-er detail with the help of an exemplifying embodiment by making reference to the appended drawings in which
Figure 1 shows a side view of a flow duct iris damper equipped with a control motor unit according to the invention;
Figure 2 shows a section on lines A-A of Fig. 1;
Figure 3 shows a top view of the structure of Fig. 1 ; and
Figure 4 shows a top view of the control ring and control leaves of the iris damper.
In Fig. 1 denoted by reference numeral 1 is shown a portion of a flow duct, particularly an air flow duct. The duct is provided with an iris-diaphragm type flow control device, whose housing is denoted by reference numeral 8 in the diagram. The internal con-struc-tion of the flow control device may be, e.g., similar to the iris damper dis-closed in FI Pat. No. 50,184 with the exception of the damper control technique employed herein. The iris damper according to the in-ven-tion is namely equipped with a control motor unit 2 comprising a motor 3, reduc-tion gear 4, a gear wheel 5 and a position-indicating poten-tiometer 6. The control motor unit 2 is detachably
mounted on the iris damper housing 8 as shown in the sectional view of Fig. 2 taken on lines A-A and is ex-ter-nally protected by a casing 7. A more detailed illustration of the control motor unit is also shown in Fig. 2. The outer perimeter of the iris damper housing 8 is provided with an opening at the gear wheel 5 thus per-mitting the gear wheel teeth to mesh with toothing 10 made on the outer pehm-eter of the iris damper control ring 9 (cf. Fig. 4). The gear wheel 5 is located chiefly outside the damper housing as can be seen from Fig. 2.
The flow rate control by means of the iris damper is implemented according to the invention so that the output shaft of the motor 3 rotates via the output shaft 11 of the reduction gear 4 the meshing gear wheel 5 that in turn rotates the control ring 9. Resuitingly, the control leaves 12 of the iris damper are moved in a conventional manner so as to increase or constrict the orifice 13 of the iris damper, depending on the direction of rotation of the control ring.
The potentiometer mounted on the shaft of the gear wheel (which may be the output shaft of the reduction gear, as well), indicates the actual posi- tion of the iris damper control ring thus facilitating an extremely accurate control of the damper orifice.
To a person versed in the art, it is obvious that the invention is not limited to the above-described exemplifying embodiments, but rather may be varied within the scope and spirit of the appended claims. Detailed description of the construction of the iris damper, which is prior-art technology, has been omitted herein as such a discussion can be found in FI Pat. No. 50,184, for instance.
Claims
1. Flow control device for ducts, said control device operating based on the iris-diaphragm principle and including an annular housing (8) having rotatably interleaving control leaves (12) adapted therein and a rotatable control ring (9) arranged to control the position of said leaves, and said flow control device further having mounted thereon a motor (3) adapted to move said control ring (9) and thus said control leaves (12) con-nected thereto, characterized in that
- a portion of the outer circumference of the control ring (9) is provided with toothing (10);
- the outer circumference of the annular damper housing (8) is provided with an opening;
- in said opening, so as to extend partially outside the outer circum-ference of said annular damper housing, there is mounted a gear wheel (5) having its teeth adapted to engage with the toothing (10) of the outer circumference of the control ring (9), and
- the shaft (11) of the gear wheel (5) is connected via reduction gear to the control motor (3).
2. Flow control device according to claim 1, characterized in that there is mounted a potentiometer (6) on the shaft (11) of the gear wheel (5) to the end of realtime sensing the actual position of the gear wheel (5).
3. Flow control device according to claim 1 or2, characterized in that the control motor (3), reduction gear (4), the control gear wheel (5) and the potentiometer (6) are integrated into a compact control unit adapted into a casing (7), whereby said control unit with its casing can be mounted detachably on the housing (8) of the flow control device.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU26274/99A AU2627499A (en) | 1998-03-13 | 1999-03-02 | Flow control device for ducts |
| SE0002817A SE520548C2 (en) | 1998-03-13 | 2000-08-03 | Flow control device for wiring |
| DK200001299A DK174380B1 (en) | 1998-03-13 | 2000-09-01 | Device for controlling the flow through a duct |
| NO20004462A NO319828B1 (en) | 1998-03-13 | 2000-09-07 | Device for controlling flow in ducts |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI980564A FI980564L (en) | 1998-03-13 | 1998-03-13 | Flow tube flow control element |
| FI980564 | 1998-03-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1999047839A1 true WO1999047839A1 (en) | 1999-09-23 |
Family
ID=8551249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FI1999/000160 WO1999047839A1 (en) | 1998-03-13 | 1999-03-02 | Flow control device for ducts |
Country Status (6)
| Country | Link |
|---|---|
| AU (1) | AU2627499A (en) |
| DK (1) | DK174380B1 (en) |
| FI (1) | FI980564L (en) |
| NO (1) | NO319828B1 (en) |
| SE (1) | SE520548C2 (en) |
| WO (1) | WO1999047839A1 (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2408095A (en) * | 2003-11-11 | 2005-05-18 | Airflow Dev Ltd | Ventilation device with a rotatable shutter |
| WO2007033694A1 (en) * | 2005-09-20 | 2007-03-29 | Veritas Ag | Valve device |
| GB2438761A (en) * | 2003-11-11 | 2007-12-05 | Airflow Dev Ltd | Ventilation device with a rotatable shutter |
| US7326108B2 (en) | 2005-02-16 | 2008-02-05 | Airflow Developments Limited | Ventilation device |
| WO2008096316A3 (en) * | 2007-02-05 | 2009-02-12 | Imtmedical Ag | Control valve for respiratory devices |
| US8132783B2 (en) | 2007-09-12 | 2012-03-13 | Lumec Control Products, Inc | Dynamic orifice valve apparatus and method |
| US9175786B2 (en) | 2013-08-30 | 2015-11-03 | Lumec Control Products, Inc. | Valve apparatus |
| EP3431883A1 (en) | 2017-07-19 | 2019-01-23 | Silverline Endüstri ve Ticaret Anonim Sirketi | Flow control device for an air exhaust system |
| CN110906442A (en) * | 2018-09-13 | 2020-03-24 | 青岛海尔空调器有限总公司 | Cabinet air conditioner and control method thereof |
| CN112197388A (en) * | 2020-11-10 | 2021-01-08 | 东莞市净诺环境科技股份有限公司 | A new fan with air outlet control structure |
| EP3825620A1 (en) | 2019-11-25 | 2021-05-26 | Silverline Endüstri ve Ticaret A.S. | Diffuser for ventilation systems |
| EP3825621A1 (en) | 2019-11-25 | 2021-05-26 | Silverline Endüstri ve Ticaret A.S. | Sensitive diffuser for central ventilation systems |
| EP3985312A1 (en) | 2020-10-14 | 2022-04-20 | Silverline Endüstri ve Ticaret A.S. | An air balancing and aeration system comprising a diffuser |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3787022A (en) * | 1972-05-22 | 1974-01-22 | C Wilcox | Iris check valve and use thereof |
| US4094492A (en) * | 1977-01-18 | 1978-06-13 | The United States Of America As Represented By The United States Department Of Energy | Variable orifice using an iris shutter |
| US5105732A (en) * | 1990-11-28 | 1992-04-21 | Sheu Muh Chuan | Wall fan with proctective cover device |
-
1998
- 1998-03-13 FI FI980564A patent/FI980564L/en unknown
-
1999
- 1999-03-02 WO PCT/FI1999/000160 patent/WO1999047839A1/en active Application Filing
- 1999-03-02 AU AU26274/99A patent/AU2627499A/en not_active Abandoned
-
2000
- 2000-08-03 SE SE0002817A patent/SE520548C2/en not_active IP Right Cessation
- 2000-09-01 DK DK200001299A patent/DK174380B1/en not_active IP Right Cessation
- 2000-09-07 NO NO20004462A patent/NO319828B1/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3787022A (en) * | 1972-05-22 | 1974-01-22 | C Wilcox | Iris check valve and use thereof |
| US4094492A (en) * | 1977-01-18 | 1978-06-13 | The United States Of America As Represented By The United States Department Of Energy | Variable orifice using an iris shutter |
| US5105732A (en) * | 1990-11-28 | 1992-04-21 | Sheu Muh Chuan | Wall fan with proctective cover device |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2408095A (en) * | 2003-11-11 | 2005-05-18 | Airflow Dev Ltd | Ventilation device with a rotatable shutter |
| GB2408095B (en) * | 2003-11-11 | 2007-11-14 | Airflow Dev Ltd | Ventilation device |
| GB2438761A (en) * | 2003-11-11 | 2007-12-05 | Airflow Dev Ltd | Ventilation device with a rotatable shutter |
| GB2438761B (en) * | 2003-11-11 | 2008-06-11 | Airflow Dev Ltd | Ventilation device |
| US7326108B2 (en) | 2005-02-16 | 2008-02-05 | Airflow Developments Limited | Ventilation device |
| WO2007033694A1 (en) * | 2005-09-20 | 2007-03-29 | Veritas Ag | Valve device |
| US8695599B2 (en) | 2007-02-05 | 2014-04-15 | Imtmedical Ag | Control valve for respiratory devices |
| WO2008096316A3 (en) * | 2007-02-05 | 2009-02-12 | Imtmedical Ag | Control valve for respiratory devices |
| US8132783B2 (en) | 2007-09-12 | 2012-03-13 | Lumec Control Products, Inc | Dynamic orifice valve apparatus and method |
| US9175786B2 (en) | 2013-08-30 | 2015-11-03 | Lumec Control Products, Inc. | Valve apparatus |
| EP3431883A1 (en) | 2017-07-19 | 2019-01-23 | Silverline Endüstri ve Ticaret Anonim Sirketi | Flow control device for an air exhaust system |
| CN110906442A (en) * | 2018-09-13 | 2020-03-24 | 青岛海尔空调器有限总公司 | Cabinet air conditioner and control method thereof |
| EP3825620A1 (en) | 2019-11-25 | 2021-05-26 | Silverline Endüstri ve Ticaret A.S. | Diffuser for ventilation systems |
| EP3825621A1 (en) | 2019-11-25 | 2021-05-26 | Silverline Endüstri ve Ticaret A.S. | Sensitive diffuser for central ventilation systems |
| EP3985312A1 (en) | 2020-10-14 | 2022-04-20 | Silverline Endüstri ve Ticaret A.S. | An air balancing and aeration system comprising a diffuser |
| CN112197388A (en) * | 2020-11-10 | 2021-01-08 | 东莞市净诺环境科技股份有限公司 | A new fan with air outlet control structure |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2627499A (en) | 1999-10-11 |
| DK174380B1 (en) | 2003-01-13 |
| SE520548C2 (en) | 2003-07-22 |
| NO319828B1 (en) | 2005-09-19 |
| FI980564A0 (en) | 1998-03-13 |
| NO20004462L (en) | 2000-11-10 |
| DK200001299A (en) | 2000-09-01 |
| SE0002817D0 (en) | 2000-08-03 |
| FI980564L (en) | 1999-09-14 |
| SE0002817L (en) | 2000-08-03 |
| NO20004462D0 (en) | 2000-09-07 |
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