AU2014263407B2 - Apparatus for measuring differential pressure in air blower - Google Patents
Apparatus for measuring differential pressure in air blower Download PDFInfo
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- AU2014263407B2 AU2014263407B2 AU2014263407A AU2014263407A AU2014263407B2 AU 2014263407 B2 AU2014263407 B2 AU 2014263407B2 AU 2014263407 A AU2014263407 A AU 2014263407A AU 2014263407 A AU2014263407 A AU 2014263407A AU 2014263407 B2 AU2014263407 B2 AU 2014263407B2
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- differential pressure
- air
- pressure
- measuring
- air blower
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L5/00—Blast-producing apparatus before the fire
- F23L5/02—Arrangements of fans or blowers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/0007—Fluidic connecting means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/04—Measuring pressure
- F23N2225/06—Measuring pressure for determining flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2233/00—Ventilators
- F23N2233/06—Ventilators at the air intake
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Measuring Fluid Pressure (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The present invention relates to an apparatus for measuring a differential pressure in an air blower, comprising: a bell mouth provided with an inlet for introducing air into the air blower; a differential pressure cover coupled to the bell mouth for transmitting an inlet pressure change through a tube; and a differential pressure measuring unit for detecting the inlet pressure change transmitted through the tube. According to the present invention, a differential pressure is measured in an intake port side of the air blower in which an air flow is most stable, while keeping the apparatus from acting as an air flow resistor so as to prevent the occurrence of turbulence, thereby allowing an accurate measurement of the differential pressure.
Description
[DESCRIPTION] [Invention Title]
APPARATUS FOR MEASURING DIFFERENTIAL PRESSURE IN AIR
BLOWER
[Technical Field]
The present invention relates to an apparatus for measuring a differential pressure in an air blower, and more particularly, to an apparatus for measuring a differential pressure in an air blower to accurately measure a differential pressure of air supplied for air proportional control of a boiler.
[Background Art]
Heating and hot water supply boilers used in general homes are divided into oil-fired boilers and gas-fired boilers depending on fuel to be used. Among them, recently, gas-fired boilers which cause less air pollution and are conveniently used are generally used and use liquefied natural gas (LNG) as fuel thereof.
Gas-fired boilers are divided into condensing type boilers and noncondensing type boilers depending on a heat exchanger which heats heating water. Among them, condensing type gas-fired boilers may directly heat heating water using combustion heat and additionally absorb condensed latent heat of exhaust fumes, thereby maximizing thermal efficiency.
As an example of generally used condensing type gas-fired boilers, a burner is installed above, a gas mixed with air is ignited and combusted downward, a heating heat exchanger installed therebelow heats heating water using high-temperature combustion gas, and the heating water heated described above is circulated throughout rooms and a living room, thereby performing a heating operation.
Also, when a hot water operation is performed, hot water supplied to the rooms and living room is shut off by operating a three-way valve, a hot water heat exchanger installed in parallel is turned on to be used as a heating source, hot water is heated while being supplied and returned to another part of the hot water heat exchanger shut off and in contact, and heated hot water is used for washing up and bath.
Gas-fired boilers configured as described may be divided into several forms depending on a control method or a sealing state. Particularly, in the case of an air proportional control method, since a pressure of air which flows from the outside is measured and then the burner is supplied with fuel proportionally to the measured pressure of the air, an accurate amount of the fuel is supplied in proportional to the pressure of the air which flows in, thereby increasing combustion efficiency and maximally restraining discharge of harmful gas to prevent environmental pollution.
That is, since a variable which controls a gas amount varies only depending on air pressure, even though a proportional control portion of a gas valve is not separately controlled, since a certain amount of gas is ejected with respect to a certain air pressure to constantly have a uniform air ratio, it is possible to accurately perform proportional control unlike an on/off type or a current proportional control type.
The air proportional control boiler described above is disclosed in detail in Korean Patent Registration No. 0406472 (titled: Air proportional control boiler using a wind pressure sensor, registered on November 7, 2003), filed by the present applicant. As shown in FIG. 1 of the registered patent No. 10-0406472, a conventional boiler uses an air pressure detection unit (refer to FIG. 1 of the registered patent No. 10-0406472 for reference numeral 50) which detects a pressure of air supplied by an air blower to perform air proportional control.
The air pressure detection unit is installed on an outlet end of the air blower and configured to detect the pressure of the air supplied to a burner and detects a differential pressure of the supplied air. A differential pressure flowmeter capable of detecting a flow rate by measuring a differential pressure of air may be used. A tightening unit installed in the middle of a duct in which an ordinary fluid flows to allow a passing area of the fluid to be narrower is used. A pressure difference between a front end and a rear end of the tightening unit occurs due to resistance which occurs in the tightening unit. The differential pressure is transferred to a manometer through a differential pressure transmitter and the flow rate is detected according to a change in capacitance caused by the differential pressure.
Due to the structure as describe above, in general, an amount of supplied air may be detected. However, as described above, since the tightening unit that is an air pressure detection unit is to be installed to protrude from an inside of an outlet end of the air blower, a new limitation may be present. FIG. 1 is a configuration diagram of a conventional apparatus for measuring a differential pressure in an air blower.
Referring to FIG. 1, the general air blower includes a housing 1 provided with an outlet end 4 on one side and an inlet 3 in a center of a front surface and an impeller 2 which is accommodated in the housing 1 and rotates according to driving of an external motor (not shown) to discharge air sucked through the inlet 3 through the outlet end 4.
To detect an amount of air supplied through the air blower having the structure described above, an air pressure detection unit 5 is provided at a part of an inside of the outlet end 4 to protrude toward a center portion of the outlet end 4.
The air pressure detection unit 5 is the tightening unit described above, and for example, may use a venturi tube, an orifice, and a flow nozzle V-cone.
However, since being provided to protrude in the inside of the outlet end 4, the air pressure detection unit 5 acts as a resistor against a flow path in which air is supplied and turbulence occurs around the air pressure detection unit 5.
Accordingly, when a differential pressure of the conventional air pressure detection unit 5 is measured in a state of closing exhaust in the boiler, the differential pressure is not fixed but varies. That is, it is normal that the differential pressure becomes 0 mmH20 when exhaust is closed but the differential pressure is not fixed but a value thereof varies in the conventional type.
Also, since the air pressure detection unit 5 is provided only at a part of the outlet end 4, when a difference in an air flow rate occurs at the part of the outlet end 4, it is impossible to detect an accurate air amount. To allow a detection point to be plural, it is necessary to increase the number of the installed air pressure detection units 5. As described above, since the air pressure detection unit 5 acts as the resistor against supplying of air, the supplying of the air may not be smoothly performed.
According to a result of measuring a differential pressure by the air pressure detection unit 5, a controller of the boiler which performs the air proportional control does not accurately control and efficiency thereof may relatively decrease.
[Disclosure] [Technical Problem]
Therefore, it is an aspect of the present invention to provide an apparatus for measuring a differential pressure in an air blower, capable of accurately measuring a flow rate of air supplied through the air blower.
Particularly, the present invention provides an apparatus for measuring a differential pressure in an air blower, in which a result of measuring a differential pressure of air supplied from the air blower in an exhaust-closing state of a boiler does not vary and converges on 0 mmHiO.
In addition, it is another aspect of the present invention to provide an apparatus for measuring a differential pressure in an air blower, capable of detecting a common differential pressure of several points without interrupting an air flow to reduce an error.
[Technical Solution]
One aspect of the present invention provides an apparatus for measuring a differential pressure in an air blower, including a bellmouth provided with an inlet through which air flows into the air blower, a differential pressure cover coupled with the bellmouth and configured to transfer pressure variations of the inlet through a tube, and a differential pressure measuring portion which detects the pressure variations of the inlet transferred through the tube.
The differential pressure cover may have an annular structure coupled with an edge of the inlet and may include a differential pressure opening provided in a direction of an inner diameter of the annular structure to be located on the edge of the inlet and a tube coupling pipe which interconnects with the differential pressure opening and protrudes to allow the tube to be coupled.
The differential pressure opening may be provided in a plural thereof, and the apparatus may further include a connection flow path which connects the plurality of differential pressure openings with one another.
The differential pressure openings may be holes provided toward the inner diameter of the differential pressure cover or grooves provided on a rear surface of the differential pressure cover, which are formed in a space from the bellmouth.
The differential pressure measuring portion may detect a differential pressure between a pressure in the tube and inside pressure of a boiler.
[Advantageous Effects]
According to the embodiments of the present invention, an apparatus for measuring a differential pressure in an air blower measures the differential pressure at an inlet in which an air flow is stablest but does not act as a resistor against the air flow, thereby preventing the occurrence of turbulence and accurately measuring the differential pressure.
Also, according to the embodiments of the present invention, a plurality of measuring holes connected by a mutual connection flow path are provided in a bellmouth installed in an inlet of an air blower, thereby minimizing errors in measuring a differential pressure even when a difference is present in an amount of air sucked through the inlet of the air blower.
Particularly, according to the embodiments of the present invention, when a differential pressure is measured in an exhaust-closing state of a boiler, a result of measuring the differential pressure is allowed to converge on 0 mmH20 and variation is not allowed to occur, thereby increasing accuracy of air proportional control of the boiler to increase efficiency of the boiler.
[Brief Description of Drawings] FIG. 1 is a configuration diagram of a conventional apparatus for measuring a differential pressure in an air blower. FIG. 2 is an exploded perspective view of an apparatus for measuring a differential pressure in an air blower according to an exemplary embodiment of the present invention. FIG. 3 is a cross-sectional view illustrating a coupled state of FIG. 2. FIG. 4 is a cross-sectional view of a part of a bellmouth of the apparatus according to the embodiment of the present invention. FIG. 5 is a view illustrating an operation concept of the apparatus according to the embodiment of the present invention.
[Brief Description of Reference Numerals]
Brief Description of Reference Numerals 10: Housing 11: Outlet end 20: Impeller 30: Cover portion 40: Bellmouth 41: Supply hole 50: Differential pressure cover 51: Differential pressure opening 52: Connection flow channel 53: Tube connection pipe 54: Tube 55: Differential pressure measuring portion [Mode for Invention]
Hereinafter, an apparatus for measuring a differential pressure in an air blower according to an embodiment of the present invention will be described with reference to the attached drawings. FIG. 2 is an exploded perspective view of an apparatus for measuring a differential pressure in an air blower according to an exemplary embodiment of the present invention. FIG. 3 is a cross-sectional view illustrating a coupled state of FIG. 2. FIG. 4 is a view illustrating measuring a differential pressure according to the embodiment of the present invention.
Referring to FIGS. 2 to 4, the apparatus for measuring the differential pressure in the air blower according to the exemplary embodiment of the present invention includes an impeller 20 which is accommodated in a housing 10 of the air blower and rotates due to rotation of a motor (not shown), a cover portion 30 which covers a front surface of the housing 10 in which the impeller 20 is accommodated and provides an exposure opening 31 through which a center portion of the impeller 20 is exposed, a bellmouth 40 which is coupled with a front surface of the cover portion 30, allows air to flow in through the exposure opening 31, and provides an inlet 41 which prevents turbulence of the air which flows therein, and a differential pressure cover 50 which includes a differential pressure opening 51 coupled with a front surface of a circumference of the inlet 41 of the bellmouth 40 to reflect a pressure at a point in time when the air flows in through the inlet 41.
The differential pressure opening 51 is located on an edge of the inlet 41 of the bellmouth 40 and is connected to a tube connection pipe 53 provided on a front surface of the differential pressure cover 50. Another end of a tube 54 one end of which is connected to the tube connection pipe 53 is connected to a differential pressure measuring portion 55 and transfers the pressure at the point in time when the air flows in through the inlet 41 to the differential pressure measuring portion 55.
Hereinafter, the apparatus for measuring the differential pressure in the air blower according to the exemplary embodiment of the present invention, configured as described above, will be described in more detail.
First, the air blower housing 10 is configured to accommodate the impeller 20 to supply air sucked by driving of the impeller 20 to a burner of a boiler and has an impeller accommodating portion with a cylindrical accommodating space and an outlet end 11 with a pipe shape smaller than the accommodating space.
The front surface of the housing 10 is open, and the cover portion 30 is coupled with the open front surface of the housing 10. A shape of the cover portion 30 is identical to a shape of the open surface of the housing 10 and is provided with the exposure opening 31 which exposes the center portion of the impeller 20 to an outside. The impeller 20 rotates to allow air to be supplied to the center portion and send the air outward, and the exposure opening 31 is provided in the cover portion 30 to supply the air.
The bellmouth 40 is coupled with the front surface of the cover portion 30 provided with the exposure opening 31. A function of the bellmouth 40 has a structure in which an area around the supply hole 41 is inclined toward the center portion of the impeller 20 to allow the supply hole 41 for supplying air to be located closer to the center portion of the impeller 20.
Also, to prevent the occurrence of turbulence in air which flow in, the inclined surface around the supply hole 41 is formed with a slow curvature.
In the structure described above, the differential pressure cover 50 is coupled with a front surface of the bellmouth 40. The differential pressure cover 50 is coupled with the circumference of the supply hole 41 provided in a center portion of the bellmouth 40 and has an annular structure having the same inner diameter as that of the supply hole 41.
The differential pressure cover 50 includes the differential pressure opening 51 on an edge of the supply hole 41 toward the inner diameter and the tube connection pipe 53 which interconnects with the differential pressure opening 51 and protrudes from a front surface thereof.
The differential pressure opening 51 may be directly provided in the differential pressure cover 50 or may be formed by providing a groove on a rear surface of the differential pressure cover 50 in a gap with the bellmouth 40.
In the structure described above, when the impeller 20 rotates, air flows into the housing 10 through the supply hole 41 provided in the center portion of the impeller 20. The air which flows in is sent to the outside of the impeller 20 and supplied to the burner of the boiler through the outlet end 11 of the housing 10.
Here, the supply hole 41 functions as a tightening unit for measuring the differential pressure and the air flows into the housing 10 through the supply hole 41, thereby reducing a pressure of the supply hole 41.
As the pressure of the supply hole 41 decreases, outside pressure of the differential pressure opening 51 becomes lower than inside pressure thereof to allow the air therein to flow outward. A change in the pressure, as shown in FIG. 4, lowers inside pressure of the tube connection pipe 53 and the tube 54.
At last, the pressure of the supply hole 41 is transferred as a first pressure PI to one side of the differential pressure measuring portion 55 through the tube 54. A pressure of another side of the differential pressure measuring portion 55 is a second pressure P2 that is inside pressure of the boiler. The differential pressure measuring portion 55 measures a differential pressure between the second pressure P2 and the first pressure PI. A deformation plate 56 provided inside the differential pressure measuring portion 55 is deformed by the differential pressure between the first pressure PI and the second pressure P2 and a difference in deformation varies according to a level of the differential pressure, thereby detecting a change of capacitance according to the level of the differential pressure.
However, the differential pressure measuring portion 55 may be replaced by various types of differential pressure sensors as necessary.
Here, the differential pressure opening 51 provided on a side surface of the supply hole 41 does not act as a resistor against a flow of the air supplied into the housing through the supply hole 41 and the front surface of the differential pressure cover 50 has a streamlined structure, thereby preventing the occurrence of the turbulence. Accordingly, the occurrence of a variable may be prevented and a differential pressure may be accurately measured.
An amount of the air supplied through the air blower may be calculated using following Equation 1.
... Equation 1
Here, rs indicates a standard air specific volume, r indicates a specific volume of current air, delta P indicates a measured differential pressure, and K indicates a constant.
Accordingly, an accurate amount of air supplied to the burner of the boiler may be detected using an accurate differential pressure value measured by the differential pressure measuring portion 55, thereby increasing accuracy of air proportional control. FIG. 5 is a partial cross-sectional view illustrating a state of coupling between the bellmouth 40 and the differential pressure cover 50 according to another embodiment of the present invention.
Referring to FIG. 5, the differential pressure cover 50 includes a plurality of such differential pressure openings 51 in contact with the supply hole 41 of the bellmouth 40 and a connection flow path 52 which connects the plurality of differential pressure openings 51 to one another.
The structure described above is to provide the plurality of differential pressure openings 51 which have been described in detail in the previous embodiment to measure a pressure of the supply hole 41 in several measuring points and to reflect an average pressure thereof to one end of the differential pressure measuring portion 55.
This is to minimize an error in measuring pressure, which may occur when there is only one differential pressure opening 51, to allow a differential pressure to be more accurately measured, thereby improving reliability in measuring the differential pressure and a supplied air amount calculated using the measured differential pressure. FIG. 6 is a view illustrating a pressure of the supply hole 41 reflected by the differential pressure openings 51 and the connection flow path 52.
Referring to FIG. 6, the four differential pressure openings 51 are arranged along the circumference of the supply hole 41 and connected by the connection flow path 52, respectively.
The tube 54 connected to the tube connection pipe 53 which interconnects with one of the differential pressure openings 51 is connected to the one end of the differential pressure measuring portion 55.
When pressures around the respective differential pressure openings 51 are Pl-1, Pl-2, Pl-3, and Pl-4, regardless of differences thereof, inside pressure of the tube 54 is shown as PI that is an average of the respective pressures Pl-1, Pl-2, Pl-3, and Pl-4. The differential pressure measuring portion 55 measures a difference between P2 that is the inside pressure of the boiler and PI that is the average of the pressures of the supply hole 41, thereby increasing reliability of measuring the differential pressure.
Also, a plurality of points for detecting the pressures are present in the supply hole 41 but does not act as resistors against the flow of the air supplied through the supply hole 41, thereby preventing intervention of variables which generate errors such as the occurrence of turbulence. FIG. 7 is a graph illustrating a measurement result of the differential pressure measuring portion 55 according to an exhaust-closing pressure.
The air blower used in the measurement is ACEIII 20K. As the exhaustclosing pressure increases, a measured differential pressure decreases. As the exhaust-closing pressure exceeds
, the differential pressure is measured within
without fluctuation. Here, the fluctuation means that the measured differential pressure increases despite an increase of the exhaust-closing pressure.
Although not shown in the graph, the differential pressure is detected 0
in a state of completely closing exhaust.
Although exemplary embodiments of the present invention have been described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the scope of the invention, the scope of which is defined in the claims, the detailed description, and the attached drawings.
[Industrial Applicability]
The present invention can accurately measure a differential pressure in an air blower to increase accuracy of air proportional control of a boiler and may be industrially applicable.
Claims (3)
- [CLAIMS] [Claim 1] An apparatus for measuring a differential pressure in an air blower, comprising: a bellmouth provided with an inlet through which air flows into the air blower; a differential pressure cover coupled with the bellmouth, configured to transfer pressure variations of the inlet through a tube, and having an annular structure coupled with an edge of the inlet, wherein the differential pressure cover comprises: a plurality of differential pressure openings provided in a direction of an inner diameter of the annular structure to be located on the edge of the inlet; a connection flow path connecting the plurality of differential pressure openings with one another in a space from the bellmouth; and a tube coupling pipe which interconnects with the differential pressure opening and protrudes to allow the tube to be coupled; and a differential pressure measuring portion which detects the pressure variations of the inlet transferred through the tube. [Claim
- 2] The apparatus according to claim 1, wherein the differential pressure openings are holes provided toward the inner diameter of the differential pressure cover or grooves provided on a rear surface of the differential pressure cover, which are formed in a space from the bellmouth. [Claim
- 3] The apparatus according to claim 1, wherein the differential pressure measuring portion detects a differential pressure between a pressure in the tube and inside pressure of a boiler.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2013-0052015 | 2013-05-08 | ||
| KR20130052015A KR101489688B1 (en) | 2013-05-08 | 2013-05-08 | Differential pressure measuring device for blower |
| PCT/KR2014/004030 WO2014182053A1 (en) | 2013-05-08 | 2014-05-07 | Apparatus for measuring differential pressure in air blower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2014263407A1 AU2014263407A1 (en) | 2015-11-26 |
| AU2014263407B2 true AU2014263407B2 (en) | 2017-09-14 |
Family
ID=51867467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2014263407A Active AU2014263407B2 (en) | 2013-05-08 | 2014-05-07 | Apparatus for measuring differential pressure in air blower |
Country Status (5)
| Country | Link |
|---|---|
| KR (1) | KR101489688B1 (en) |
| CN (1) | CN105209876B (en) |
| AU (1) | AU2014263407B2 (en) |
| RU (1) | RU2633003C2 (en) |
| WO (1) | WO2014182053A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106814545B (en) * | 2015-11-30 | 2018-08-24 | 上海微电子装备（集团）股份有限公司 | Air pressure measuring apparatus and method, focusing leveling device and photoetching machine equipment |
| DE102018105063A1 (en) * | 2018-03-06 | 2019-09-12 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Apparatus and method for air volume detection |
| KR102403219B1 (en) | 2019-09-11 | 2022-05-30 | 주식회사 경동나비엔 | Bellmouth, air supply assembly includng the same and air supply control system using the same |
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| US5947680A (en) * | 1995-09-08 | 1999-09-07 | Ebara Corporation | Turbomachinery with variable-angle fluid guiding vanes |
| JP2001165741A (en) * | 1999-12-06 | 2001-06-22 | Japan National Oil Corp | Multi-phase fluid flow meter and multi-phase fluid flow operation method |
| KR100870887B1 (en) * | 2008-07-23 | 2008-11-27 | (주) 터보맥스 | Turbo machinery equipped with measuring means of bellmouth type for measuring inlet flow-rate of air or gas |
| KR20090090040A (en) * | 2008-02-20 | 2009-08-25 | 한라공조주식회사 | Air blower |
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| JPH11118638A (en) * | 1997-10-09 | 1999-04-30 | Yamatake Corp | Apparatus for measuring pressure loss or flow rate of high viscosity slurry fluid and manufacture of its measuring tube |
| KR100872214B1 (en) * | 2007-01-31 | 2008-12-05 | 엘지노텔 주식회사 | Optical network terminator in passive optical network system and method for transmitting broadcast/ethernet data |
| KR100870877B1 (en) * | 2007-10-30 | 2008-11-28 | 박세준 | SJP microorganism in Camobacterium |
| CN201173839Y (en) * | 2008-04-02 | 2008-12-31 | 李岩峰 | Mechanical type differential pressure meter with temperature and humidity directive function |
| DE102008049809A1 (en) * | 2008-09-30 | 2010-04-08 | Eastman Kodak Co. | Sheet conveying device for use in e.g. sheet separating device, has constant pressure controller in air line for maintain constant pressure differential between interior space of air line and air line environment |
| KR101162234B1 (en) | 2009-12-02 | 2012-07-04 | 이기현 | Simulator for air filtering device |
| US10060837B2 (en) * | 2010-04-21 | 2018-08-28 | Western Energy Support and Technology, Inc | Differential pressure constant volume flow air sampler |
| CN103658221B (en) * | 2013-12-19 | 2015-12-30 | 江阴江顺铝型材成套设备制造有限公司 | A kind of hot shearing furnace combustion chamber air inlet pressure tester |
-
2013
- 2013-05-08 KR KR20130052015A patent/KR101489688B1/en active IP Right Grant
-
2014
- 2014-05-07 RU RU2015152429A patent/RU2633003C2/en active
- 2014-05-07 WO PCT/KR2014/004030 patent/WO2014182053A1/en active Application Filing
- 2014-05-07 AU AU2014263407A patent/AU2014263407B2/en active Active
- 2014-05-07 CN CN201480026294.3A patent/CN105209876B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5947680A (en) * | 1995-09-08 | 1999-09-07 | Ebara Corporation | Turbomachinery with variable-angle fluid guiding vanes |
| JP2001165741A (en) * | 1999-12-06 | 2001-06-22 | Japan National Oil Corp | Multi-phase fluid flow meter and multi-phase fluid flow operation method |
| KR20090090040A (en) * | 2008-02-20 | 2009-08-25 | 한라공조주식회사 | Air blower |
| KR100870887B1 (en) * | 2008-07-23 | 2008-11-27 | (주) 터보맥스 | Turbo machinery equipped with measuring means of bellmouth type for measuring inlet flow-rate of air or gas |
Also Published As
| Publication number | Publication date |
|---|---|
| RU2633003C2 (en) | 2017-10-11 |
| CN105209876B (en) | 2017-10-31 |
| WO2014182053A1 (en) | 2014-11-13 |
| KR20140132597A (en) | 2014-11-18 |
| CN105209876A (en) | 2015-12-30 |
| RU2015152429A (en) | 2017-06-14 |
| KR101489688B1 (en) | 2015-02-04 |
| AU2014263407A1 (en) | 2015-11-26 |
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