WO2004063676A1 - Portable airflow meter - Google Patents

Portable airflow meter Download PDF

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Publication number
WO2004063676A1
WO2004063676A1 PCT/KR2004/000060 KR2004000060W WO2004063676A1 WO 2004063676 A1 WO2004063676 A1 WO 2004063676A1 KR 2004000060 W KR2004000060 W KR 2004000060W WO 2004063676 A1 WO2004063676 A1 WO 2004063676A1
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WO
WIPO (PCT)
Prior art keywords
air
measuring
amount
nozzle
cylindrical casing
Prior art date
Application number
PCT/KR2004/000060
Other languages
French (fr)
Inventor
Sang-Taek Oh
Original Assignee
Sang-Taek Oh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sang-Taek Oh filed Critical Sang-Taek Oh
Publication of WO2004063676A1 publication Critical patent/WO2004063676A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/40—Details of construction of the flow constriction devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/40—Details of construction of the flow constriction devices
    • G01F1/42—Orifices or nozzles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/50—Correcting or compensating means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/02—Compensating or correcting for variations in pressure, density or temperature
    • G01F15/04—Compensating or correcting for variations in pressure, density or temperature of gases to be measured
    • G01F15/043—Compensating or correcting for variations in pressure, density or temperature of gases to be measured using electrical means
    • G01F15/046—Compensating or correcting for variations in pressure, density or temperature of gases to be measured using electrical means involving digital counting
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/12—Cleaning arrangements; Filters
    • G01F15/125—Filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/30—Velocity

Definitions

  • the present invention relates to an apparatus for measuring the amount of air disch arged from a vent (discharging port), and in particular to a portable airflow meter for m easuring the amount of discharged air capable of accurately and quickly measuring the amount of air from an air conditioner duct system of a vehicle needing an accurate mea surement of discharged air, a small size blower adapted to cool a computer CPU (Centr al Processing Unit), and an air ⁇ ct of an indoor air conditioner and ventilation apparat us of a building, and in the present invention, a flow meter is portable.
  • a portable airflow meter for m easuring the amount of discharged air capable of accurately and quickly measuring the amount of air from an air conditioner duct system of a vehicle needing an accurate mea surement of discharged air
  • a small size blower adapted to cool a computer CPU (Centr al Processing Unit)
  • an air ⁇ ct of an indoor air conditioner and ventilation apparat us of a building and in the present
  • a plurality of vents are provided in a front side of an indoor of a vehicle for discharging air.
  • the amount of air discharged from each vent should be determined based on a provision.
  • the amcu nt of air discharged should be accurately measured using a measuring apparatus capabl e of measuring the amount of air discharged. Therefore, a certain apparatus capable of accurately measuring the amount of air discharged is urgently needed.
  • the conventional apparatus for measuring the amount of air discharged is achieved based on a complicated measuring method. It is not portable, so that it is no t easy to use the same. Disclosure of Invention
  • a portable airflow meter capable of measuring the amount of air discharged, comprising a cylindrical casing(10) having a c ylindrical casing rear part(ll) having an opened front end and an air cutlet(lla) forme d at a lateral side of the same and a cylindrical casing front part(12) detachably engage d to a front side of the cylindrical casing rear part(l 1) and having an air inlet(12a) in a front side of the same; a flexible duct(20) connected between the air inlet(12a) of the c ylindrical casing(10) and a vent(l) adapted to discharge air; a purifying apparatus(30) i nstalled in an inner front side of the cylindrical casing(10) for purifying air inputted; a nozzle(40) installed at a rear side of the purifying apparatus(30); a fixed pressure meas uring pressure sensor(50) installed at a front end of the flexible
  • Figure 1 is a perspective view illustrating a portable airflow meter for measuring th e amount of air discharged according to the present invention
  • Figure 2 is a cross sectional view illustrating a state of use of a portable airflow me ter for measuring the amount of air discharged according to the present invention.
  • Figure 3 is a disassembled perspective view illustrating a nozzle, a nozzle fixing pi ate and a nozzle cover of an airflow meter according to the present invention.
  • Figure 1 is a perspective view illustrating a portable airflow meter for measuring th e amount of air discharged according to the present invention
  • Figure 2 is a cross sectio nal view illustrating a state of use of a portable airflow meter for measuring the amcun t of air discharged according to the present invention
  • Figure 3 is a disassembled p erspective view illustrating a nozzle, a nozzle fixing plate, and a nozzle cover of an airf low meter according to the present invention.
  • the portable airflow meter capable of measuring the amount of a ir discharged includes a cylindrical casing(10) inclu ding a cylindrical casing rear part(ll) having an opened front side and an air outlet(lla ) formed in a lateral side, and a cylindrical casing front part(12) detachably engaged to a front side of the cylindrical casing rear part(l 1) and having an air inlet(12a) in a front side, a flexible dxt(20) connected between the air inlet(12a) of the cylindrical casing ( 10) and a vent(l) adapted to discharge air, a purifying apparatus(30) installed in an inn er front side of the cylindrical casing(10) for uniformly purifying air inputted, a nozzle (40) installed in a rear side of the purifying apparatus(30), a fixed pressure measuring pressure sensor(50) installed at a front end of the flexible duct(20), a difference pressur e measuring pressure sensor(51)
  • a LCD panel(71) installed in a lower si de of the cylindrical casing(10) for displaying various measurement values, and a contr ol box (70) having a plurality of buttons.
  • a handle(80) is provided on an upper side of the cylindrical casing(10) for achieving an easier handling.
  • the cylindrical casing rear part(l 1) having a relatively longer length and the cylindrical casing front ⁇ art(12) having a relatively shorter length are detachable provided by a plurality of attaching and detaching members(13), so that it is possible to achieve an easier switch of the nozzle(40) or the sensor.
  • the cylindrica 1 casing(10) is preferably formed of a transparent synthetic resin, so that the inner side of the same is viewed from the outside.
  • the front end of the flexible dxt(20) is sealingly engaged to the vent (1) adapted t o discharge air.
  • the front end of the flexible duct (20) is designed to cover the surrounding portions of the bent(l) and to connect the flexible dxt(20).
  • the front end of the flexible d-ct(20) is connected with a vent contact part(21) having an elastic me mber(21a) on the front surface.
  • the portions between the edge portion of the vent cont act part(21) and the surrounding portions of the vent(l) are iully sealed by a certain sea ling tape.
  • the purifying apparatus(30) is formed of two plates each having a plurality of hole s for thereby aligning the flow of air.
  • the nozzle(40) is formed of a metallic material for measuring the amount of air dis charged from the vent(l) by measuring the amount of the air passing through the interi or of the same.
  • the size of the nozzle(40) is determined based on the discharging amcu nt of air of the vent(l).
  • the nozzle(40) has the outer diameter same as the inner di ameter of the cylindrical casing(10) and is fixed between a nozzle fixing plate(41) for med of a synthetic resin and a nozzle cover(42).
  • the nozzle(40) is installed in such a m anner that the nozzle fixing plate(41) is inserted into the cylindrical casing(10). At this time, the nozzle fixing plate(41) and the cylindrical casing(10) are engaged with no ga ps therebetween by their elastic forces.
  • the size of the nozzle(40) is recognizable by providing an index protrusion(41a) an d two push buttons(41b) and (41c) on the nozzle fixing plate (41).
  • An index hole (40a) is formed at a portion corresponding to the index protrusion(41a) in the nozzle(40).
  • Hb les(40b) and (40c) are formed at the portions corresponding to two push buttons(41b) a nd (41c) or the hole (40b) is formed only at the portion corresponding to the push butto n(41b) of one side or the hole is not formed at the portion corresponding to the push bu tton(41c) of the other side, or the hole is not formed at the portion corresponding to the push button(41b) of one side or the hole(40c) is formed at the portion corresponding to the push button(41c) of the other side, or the hole is not formed at the portions corresp onding to two push buttons(41b) and (41c), respectively.
  • the holes(40b) and (40c) are differently formed for four nozzles(40) having different four sizes (inner sizes). Theref ore, four types of on and off operations of the push buttons(41b) and (41c) are obtained for thereby recognizing the sizes (inner diameters) of the nozzles.
  • the index protrus ion(41a) of the nozzle fixing plate(41) is inserted into the index hole(40a) of the nozzle (40). Since the holes are formed at the portions corresponding to the push buttons(41b) and (41c) of the nozzle fixing plate(41) based on the sizes of the nozzle(40) or the hole s are not formed, the on and off operations of the push buttons(41b) and (41c) are diffe rent based on the kinds of the nozzles for thereby recognizing the sizes (inner diameter s) of the nozzles.
  • the air blower(60) includes a fan capable of sucking air and discharging in a direct ion perpendicular to the axis. The air is discharged through the air cutlet(l la) of the cy lindrical casing(10).
  • the nozzle(40) h aving a proper size based on the amount of the air discharging of the vent(l) is selected .
  • the selected nozzle(40) is engaged to the nozzle fixing plate(41) fixed to the cylindri cal casing rear ⁇ art(ll), and the nozzle cover(42) is engaged using screws for thereby f ixing the nozzle(40).
  • the size of the nozzle(40) is automatically recognize d by the on and off operations of the push buttons(41b) and (41c) of the nozzle fixing p late(41).
  • vent contact part(12) is contacted with the surroundings of th e vent(l), and the portions between the edge portion of the vent contact part(21) and th e vent(l) are sealed by the sealing tape for thereby preventing a leakage of air.
  • the controller of the control box (70) computes the amount of air passing thro ugh the nozzle(40) based on the difference pressure using the difference pressure meas uring pressure sensors(50) installed at the inlet and outlet of the nozzle(40) and the tern perature measured by the temperature sensor(52).
  • the environment that the air is discharged from the vent(l) is actually reproduced for thereby measuring the amount of air.
  • the amount of air is m easured based on the temperature and moisture of air, so that it is possible to achieve a n accurate computation of the amount of air.
  • the amount of air is automatic ally computed by the program previously installed in the system for thereby achieving a quick operation.
  • the airflow meter of the present invention has a compact c onstruction. Since there is provided the handle(80), it is portable and easy to move.
  • the portable airflow meter capable of measuring the amount of air discharged acco rding to the present invention is capable of accurately and quickly measuring the amcu nt of air discharged and has a compact construction and is portable. An operation of th e same is easy and convenient.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Measuring Volume Flow (AREA)

Abstract

An apparatus for measuring the amount of air discharged from a vent is disclosed. The portable airflow meter for measuring the amount of discharged air is capable of accurately and quickly measuring the amount of air from an air conditioner duct system of a vehicle needing an accurate measurement of discharged air, a small size blower adapted to cool a computer CPU, and an air duct of an indoor air conditioner and ventilation apparatus of a building, and in the present invention, a flow meter is portable.

Description

Description
PORTABLE AIRFLOW METER
Technical Field
[1] The present invention relates to an apparatus for measuring the amount of air disch arged from a vent (discharging port), and in particular to a portable airflow meter for m easuring the amount of discharged air capable of accurately and quickly measuring the amount of air from an air conditioner duct system of a vehicle needing an accurate mea surement of discharged air, a small size blower adapted to cool a computer CPU (Centr al Processing Unit), and an air άct of an indoor air conditioner and ventilation apparat us of a building, and in the present invention, a flow meter is portable.
Background Art
[2] Generally, it is needed to control the amount of air discharged from an air conditio ner duct system of a vehicle, a small size air blower adapted to cool a computer CPU a nd an indoor air conditioner and a ventilation apparatus of a building within a certain r ange.
[3] For example, in an air conditioner duct system of a vehicle, a plurality of vents are provided in a front side of an indoor of a vehicle for discharging air. The amount of air discharged from each vent should be determined based on a provision. First, the amcu nt of air discharged should be accurately measured using a measuring apparatus capabl e of measuring the amount of air discharged. Therefore, a certain apparatus capable of accurately measuring the amount of air discharged is urgently needed.
[4] Since air has a cohesive fluid property, the air causes a fluid separation phenomeno n or a turbulence phenomenon because airflow is affected by a boundary portion durin g a discharging, so that it is impossible to measure the amount of air discharged based on an average flow speed. The conventional apparatus for measuring the amount of dis charged air using a hot wire is designed not to measure an average flow speed, but to measure an over flow. Therefore, there is an error of 10% through 12% in minimim, s o that there are many problems for actually adapting the same.
[5] In addition, the conventional apparatus for measuring the amount of air discharged is achieved based on a complicated measuring method. It is not portable, so that it is no t easy to use the same. Disclosure of Invention
Technical Solution
[6] Accordingly, it is an object of the present invention to provide a portable airflow m eter capable of measuring the amount of air discharged that overcomes the problems e nccuntered in the conventional art.
[7] It is another object of the present invention to provide a portable airflow meter cap able of measuring the amount of air discharged capable of accurately and quickly meas uring the amount of air discharged and achieving a portable system.
[8] To achieve the above objects, there is provided a portable airflow meter capable of measuring the amount of air discharged, comprising a cylindrical casing(10) having a c ylindrical casing rear part(ll) having an opened front end and an air cutlet(lla) forme d at a lateral side of the same and a cylindrical casing front part(12) detachably engage d to a front side of the cylindrical casing rear part(l 1) and having an air inlet(12a) in a front side of the same; a flexible duct(20) connected between the air inlet(12a) of the c ylindrical casing(10) and a vent(l) adapted to discharge air; a purifying apparatus(30) i nstalled in an inner front side of the cylindrical casing(10) for purifying air inputted; a nozzle(40) installed at a rear side of the purifying apparatus(30); a fixed pressure meas uring pressure sensor(50) installed at a front end of the flexible duct(20); a difference p ressure measuring pressure sensor(51) installed at the front and rear sides of the nozzle (40) for measuring a difference pressure between the front and read sides of the same; a temperature sensor(52) for measuring the temperature of air flowing; a moisture sens or (53) for measuring the moisture of air flowing; and an air blower(60) installed at an end of the cylindrical casing (10) for adjusting the amount of air flowing in the flexible dxt(20) in order to enable the pressure of the front end of the flexible duct(20) to have an atmospheric pressure and discharging the air through the air cutlet(lla).
Description of Drawings
[9] The preferred embodiments of the present invention will be described with referen ce to the accompanying drawings.
[10] Figure 1 is a perspective view illustrating a portable airflow meter for measuring th e amount of air discharged according to the present invention;
[11] Figure 2 is a cross sectional view illustrating a state of use of a portable airflow me ter for measuring the amount of air discharged according to the present invention; and
[12] Figure 3 is a disassembled perspective view illustrating a nozzle, a nozzle fixing pi ate and a nozzle cover of an airflow meter according to the present invention.
Best Mode
[13] The preferred embodiment of the present invention will be described with referenc e to the accompanying drawings.
[14] Figure 1 is a perspective view illustrating a portable airflow meter for measuring th e amount of air discharged according to the present invention, Figure 2 is a cross sectio nal view illustrating a state of use of a portable airflow meter for measuring the amcun t of air discharged according to the present invention, and Figure 3 is a disassembled p erspective view illustrating a nozzle, a nozzle fixing plate, and a nozzle cover of an airf low meter according to the present invention.
[15] As shown therein, the portable airflow meter capable of measuring the amount of a ir discharged according to the present invention includes a cylindrical casing(10) inclu ding a cylindrical casing rear part(ll) having an opened front side and an air outlet(lla ) formed in a lateral side, and a cylindrical casing front part(12) detachably engaged to a front side of the cylindrical casing rear part(l 1) and having an air inlet(12a) in a front side, a flexible dxt(20) connected between the air inlet(12a) of the cylindrical casing ( 10) and a vent(l) adapted to discharge air, a purifying apparatus(30) installed in an inn er front side of the cylindrical casing(10) for uniformly purifying air inputted, a nozzle (40) installed in a rear side of the purifying apparatus(30), a fixed pressure measuring pressure sensor(50) installed at a front end of the flexible duct(20), a difference pressur e measuring pressure sensor(51) installed at the front and rear sides of the nozzle(40) f or measuring a difference pressure between the front and rear sides of the nozzle(40), a temperature sensor(52) for measuring the temperature of air, a moisture sensor(53) for measuring the moisture of air, and an air blower(60) installed at an end of the cylindric al casing (10) for adjusting the amount of air flowing through the flexible dxt(20) in o rder to enable the pressure at the front end of the flexible duct(20) to have an atmosphe ric pressure and for flowing the air through the air outlet(lla).
[16] In the present invention, there are provided a LCD panel(71) installed in a lower si de of the cylindrical casing(10) for displaying various measurement values, and a contr ol box (70) having a plurality of buttons. A handle(80) is provided on an upper side of the cylindrical casing(10) for achieving an easier handling.
[17] In the cylindrical casing(10), the cylindrical casing rear part(l 1) having a relatively longer length and the cylindrical casing front ρart(12) having a relatively shorter length are detachable provided by a plurality of attaching and detaching members(13), so that it is possible to achieve an easier switch of the nozzle(40) or the sensor. The cylindrica 1 casing(10) is preferably formed of a transparent synthetic resin, so that the inner side of the same is viewed from the outside.
[18] The front end of the flexible dxt(20) is sealingly engaged to the vent (1) adapted t o discharge air. Namely, the front end of the flexible duct (20) is designed to cover the surrounding portions of the bent(l) and to connect the flexible dxt(20). The front end of the flexible d-ct(20) is connected with a vent contact part(21) having an elastic me mber(21a) on the front surface. The portions between the edge portion of the vent cont act part(21) and the surrounding portions of the vent(l) are iully sealed by a certain sea ling tape.
[19] The purifying apparatus(30) is formed of two plates each having a plurality of hole s for thereby aligning the flow of air.
[20] The nozzle(40) is formed of a metallic material for measuring the amount of air dis charged from the vent(l) by measuring the amount of the air passing through the interi or of the same. The size of the nozzle(40) is determined based on the discharging amcu nt of air of the vent(l). Here, the nozzle(40) has the outer diameter same as the inner di ameter of the cylindrical casing(10) and is fixed between a nozzle fixing plate(41) for med of a synthetic resin and a nozzle cover(42). The nozzle(40) is installed in such a m anner that the nozzle fixing plate(41) is inserted into the cylindrical casing(10). At this time, the nozzle fixing plate(41) and the cylindrical casing(10) are engaged with no ga ps therebetween by their elastic forces.
[21] The size of the nozzle(40) is recognizable by providing an index protrusion(41a) an d two push buttons(41b) and (41c) on the nozzle fixing plate (41). An index hole (40a) is formed at a portion corresponding to the index protrusion(41a) in the nozzle(40). Hb les(40b) and (40c) are formed at the portions corresponding to two push buttons(41b) a nd (41c) or the hole (40b) is formed only at the portion corresponding to the push butto n(41b) of one side or the hole is not formed at the portion corresponding to the push bu tton(41c) of the other side, or the hole is not formed at the portion corresponding to the push button(41b) of one side or the hole(40c) is formed at the portion corresponding to the push button(41c) of the other side, or the hole is not formed at the portions corresp onding to two push buttons(41b) and (41c), respectively. The holes(40b) and (40c) are differently formed for four nozzles(40) having different four sizes (inner sizes). Theref ore, four types of on and off operations of the push buttons(41b) and (41c) are obtained for thereby recognizing the sizes (inner diameters) of the nozzles.
[22] When the nozzle(40) and the nozzle fixing plate(41) are engaged, the index protrus ion(41a) of the nozzle fixing plate(41) is inserted into the index hole(40a) of the nozzle (40). Since the holes are formed at the portions corresponding to the push buttons(41b) and (41c) of the nozzle fixing plate(41) based on the sizes of the nozzle(40) or the hole s are not formed, the on and off operations of the push buttons(41b) and (41c) are diffe rent based on the kinds of the nozzles for thereby recognizing the sizes (inner diameter s) of the nozzles. [23] The air blower(60) includes a fan capable of sucking air and discharging in a direct ion perpendicular to the axis. The air is discharged through the air cutlet(l la) of the cy lindrical casing(10).
[24] The operation of the portable airflow meter capable of measuring the amount of air discharged according to the present invention will be described.
[25] In a state that the cylindrical casing front part(12) is disassembled, the nozzle(40) h aving a proper size based on the amount of the air discharging of the vent(l) is selected . The selected nozzle(40) is engaged to the nozzle fixing plate(41) fixed to the cylindri cal casing rear ρart(ll), and the nozzle cover(42) is engaged using screws for thereby f ixing the nozzle(40). At this time, the size of the nozzle(40) is automatically recognize d by the on and off operations of the push buttons(41b) and (41c) of the nozzle fixing p late(41).
[26] The cylindrical casing front part(12) into which the purifying apparatus (30) is inse rted is engaged to the cylindrical casing rear part(l 1) using the attaching and detaching member(13).
[27] In the above state, the vent contact part(12) is contacted with the surroundings of th e vent(l), and the portions between the edge portion of the vent contact part(21) and th e vent(l) are sealed by the sealing tape for thereby preventing a leakage of air.
[28] Since almost the air discharged from the vent(l) is discharged under the atmospher ic environment, the pressure in the flexible duct(20) near the vent(l) should maintain a tmospheric pressure. Therefore, the amount of air changed by measuring the pressure n ear the bent(l) in accordance with the signal from the fixed pressure measuring pressur e sensor(50) and by controlling the air blower (60), so that the pressure near the vent(l ) becomes the atmospheric pressure.
[29] Next, the controller of the control box (70) computes the amount of air passing thro ugh the nozzle(40) based on the difference pressure using the difference pressure meas uring pressure sensors(50) installed at the inlet and outlet of the nozzle(40) and the tern perature measured by the temperature sensor(52).
2
[30] At this time, the amount of air is computed based on Equation Q=( p x D 14) x 360
1/2 3
0 x [2gh/r] m /hour where D is the inner diameter [m] of the cutlet of the nozzle, g is
2 the gravity acceleration [9.8m/sec ], and h is a difference pressure [mmH O, kg/m ].
3 2 2
[31] In addition, r is the viscosity of air [kg/m ] and is computed based on Equation r =
1.2931 x [273/(273+-)] x [(P-0.37 f Ps) / 760] where f is a relative moisture, Ps is a pre ssure of a saturated vapor at t ° C and has a value of 1.
[32] The above computation is automatically performed by the controller installed in th e control box (70)
[33] , and a result of the computation is displayed on the LCD panel(71). A difference p ressure, a temperature, an atmospheric pressure, etc. measured by various sensors are d isplayed on the LCD panel (71).
[34] In the present invention, the environment that the air is discharged from the vent(l) is actually reproduced for thereby measuring the amount of air. The amount of air is m easured based on the temperature and moisture of air, so that it is possible to achieve a n accurate computation of the amount of air. In addition, the amount of air is automatic ally computed by the program previously installed in the system for thereby achieving a quick operation.
[35] In the present invention, the airflow meter of the present invention has a compact c onstruction. Since there is provided the handle(80), it is portable and easy to move.
[36] In the present invention, all measurements are automatically performed except for t he operation that the fixed pressure of the vent(l) is adjusted to have atmospheric press ure by controlling the air blower(60), so that it is easy to handle and use.
Industrial Applicability
[37] The portable airflow meter capable of measuring the amount of air discharged acco rding to the present invention is capable of accurately and quickly measuring the amcu nt of air discharged and has a compact construction and is portable. An operation of th e same is easy and convenient.
[38] As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above -described examples are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications t hat fall within the meets and bounds of the claims, or equivalences of such meets and b cunds are therefore intended to be embraced by the appended claims.

Claims

Claims
[1] A portable airflow meter capable of measuring the amount of air discharged, co mprising: a cylindrical casing(10) having a cylindrical casing rear part(l 1) having an opene d front end and an air cutlet 11a formed at a lateral side of the same and a cylindr ical casing front part(12) detachably engaged to a front side of the cylindrical cas ing rear part(l 1) and having an air inlet(12a) in a front side of the same; a flexible dxt(20) connected between the air inlet(12a) of the cylindrical casing( 10) and a vent(l) adapted to discharge air; a purifying apparatus(30) installed in an inner front side of the cylindrical casing (10) for purifying air inputted; a nozzle(40) installed at a rear side of the purifying apparatus(30); a fixed pressure measuring pressure sensor(50) installed at a front end of the flex ible dxt(20); a difference pressure measuring pressure sensor(51) installed at the front and rear sides of the nozzle(40) for measuring a difference pressure between the front and read sides of the same; a temperature sensor (52) for measuring the temperature of air flowing; a moisture sensor(53) for measuring the moisture of air flowing; and an air blower(60) installed at an end of the cylindrical casing(10) for adjusting th e amount of air flowing in the flexible dxt(20) in order to enable the pressure of the front end of the flexible dxt(20) to have an atmospheric pressure and dischar ging the air through the air cutlet (11a).
PCT/KR2004/000060 2003-01-16 2004-01-15 Portable airflow meter WO2004063676A1 (en)

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KR20-2003-0001393U KR200309477Y1 (en) 2003-01-16 2003-01-16 Portable air flow meter for measuring the amount of air to be flowed out
KR20-2003-0001393 2003-01-16

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