CN201434752Y - Air leakage volume test device of purification air-conditioning system - Google Patents

Air leakage volume test device of purification air-conditioning system Download PDF

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Publication number
CN201434752Y
CN201434752Y CN2009201424250U CN200920142425U CN201434752Y CN 201434752 Y CN201434752 Y CN 201434752Y CN 2009201424250 U CN2009201424250 U CN 2009201424250U CN 200920142425 U CN200920142425 U CN 200920142425U CN 201434752 Y CN201434752 Y CN 201434752Y
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China
Prior art keywords
air
pressure
air compartment
compartment
nozzle
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CN2009201424250U
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Chinese (zh)
Inventor
强克炎
邵俊
沈卫东
钱永林
沈群群
黄文国
王民硕
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SUZHOU INDUSTRIAL EQUIPMENT INSTALLATION Co Ltd
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SUZHOU INDUSTRIAL EQUIPMENT INSTALLATION Co Ltd
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Abstract

The utility model discloses an air leakage volume test device of a purification air-conditioning system, which comprises an air chamber provided with an air inlet and an air outlet, wherein a restricting element is mounted in the air chamber, the restricting element divides the air chamber into an upstream air chamber and a downstream air chamber, and the upstream air chamber and the downstream air chamber are connected with the pressure measuring device. The air leakage volume test device is characterized in that the area of the cross section of the air inlet of the air chamber is equal to that of the air outlet. The air leakage volume test device has stable and reliable running and convenient installation, operation and transportation, is suitable for a mounting enterprise with big flowability, can adopt a mini programmable controller to process on-spot reading parameters, and can timely and accurately display the air leakage volume value of a specific test system.

Description

Air leakage amount testing device of clean air conditioning system
Technical field
The invention belongs to air cleaning and conditioning system inleakage quantitative measurement technology field in the installing construction technology, be specifically related to air leakage amount testing device of clean air conditioning system in a kind of air cleaning and conditioning system.
Background technology
The intensity of airduct and tight performance in the ventilation and air conditioning system.It is one of important indicator of weighing airduct processing and fabricating quality.Air-line system is owing to reasons in structure, and it is normal leaking out on a small quantity, also can be described as inevitably, but excessive leaking out can cause a large amount of wastes of air conditioner energy virtually.Inleakage (airleakage rate) is meant in the air-line system, passes through airduct body construction and interface thereof, the volume of air amount of releasing in the unit interval or infiltrating under a certain static pressure.At present standard GB 50243-2002 " code for acceptance of construction quality of conditioning works " with air leakage rate testing as essential items for inspection.
At present the tightness of all kinds of engineerings of air conditioner ventilation is tested, still continue to use the inspection of light leak method, light leak detects (air leak check with lighting) and utilizes the strong penetrating power of light to aperture, with intense light source the printing opacity inspection is carried out in seaming, seam, flange and other junctions of airduct, determine the method for seepage places such as hole, slit and quantity, can the tight degree of detection system airduct.Detect the safe light source with certain intensity commonly used, be not less than the low-voltage lighting that 100W is with protective cover in the mobile light source as handing, or other low-voltage light sources.When system's airduct light leak detected, light source can place the airduct inboard or the outside, but its opposite side should be black dull environment.Detection light source should be done slowly to move along detected interface position and seam, observes at opposite side, and when finding have light to penetrate, then the place of obviously leaking out is found in explanation.To the detection of system's airduct, often adopt the method for segmentation detection, Macro or mass analysis.On the basis of strict installation quality management, the detection of system's airduct is based on house steward and main.When adopting the tightness of light leak method detection system, the low-pressure system airduct is with every 10m seam, and light leak spot is not more than 2 places, and the 100m seam on average to be not more than 16 places be qualified; The every 10m seam of medium voltage network airduct, light leak spot is not more than 1 place, and the 100m seam on average to be not more than 8 places be qualified.Gap-shaped light leak to finding during light leak detects should be made encapsulation process.Yet because the inspection of light leak method belongs to qualitative examination, accuracy is low, after causing a lot of construction works to be delivered for use, the situation that system's inleakage exceeds standard, system's voltage supply, air feed ability are lower than regulation happens occasionally, result of use difference and wasting energy does not meet the relevant requirements of the building energy conservation that state compulsion implements.
For satisfying standard air-conditioning, purification air-conditioning airduct are carried out the requirement of inleakage detection by quantitative, existing technology is in the prior art, do source of the gas with big blower fan, be aided with pressure, differential pressure measurement element, connect the straight length that reaches 2-3 rice in the blower fan exit, be connected with air-line system again after the assembled on site, carry out pressure, pressure differential detection, and then carry out the inleakage hand computation by the formula of regulation and stipulation.Yet on-the-spot hand computation length consuming time, efficient are low; Device is heavy, and its general assembly (TW) reaches more than the 100Kg; Use inconvenience, measuring accuracy is low.
Chinese patent ZL94212704.8 discloses a kind of airduct Leak Off Test (LOT) instrument May 24 nineteen ninety-five, and its fan electromotor arrangements for speed regulation are variable-frequence governors, and it links to each other with fan electromotor with power supply; The outlet of blower fan is communicated with tested airduct by flexible pipe, the air-flow measurement meter is the air mass flow pressure gauge that two one ends communicate with atmosphere, wherein the manometric end of U-shaped is linked to each other with tested airduct by flexible pipe, and the manometric lower end of tilting communicates with blower fan inlet flow rate pipe.Though this device can carry out dependence test roughly, but the selection of the measuring element that the subject matter that exists is this device to be adopted and set up lack of standardization, blower fan inlet flow rate pipe particularly, this pipe is Venturi tube, by technical requirement, institute of system error of measurement is pressed the pressure differential that should be Venturi tube throat front and back, and this patent is surveyed and but is the pressure difference between Venturi tube and the atmosphere, does not meet the regulation of national standard " flow measurement differential pressure producer ".And because the used manometric value of U-shaped pressure gauge, tilting of this device adopts millimeter of water system, and the straight-through atmosphere of the entrance point of blower fan inlet flow rate pipe, there is not any rectification design, system does not establish the air themperature compensation yet, so measuring accuracy is poor.The value that leaks out in addition adopts hand computation, and on-the-spot calculating is numerous and diverse.
Air-conditioning system air compartment formula airduct air leakage amount testing device has also been proposed among the CNS GB50243-2002 " code for acceptance of construction quality of conditioning works ".From the angle of cardinal rule stipulated air leakage amount testing device of clean air conditioning system by blower fan, connect airduct, pressure tester, homogenizing plate, flow controller, air compartment, dividing plate and nozzle etc. and form.Flow controller is equipped with in air compartment inside, and described nozzle is divided into the upstream and downstream air compartment with air compartment, and the upstream and downstream air compartment connects the pressure measurement instrument.By passing through the flow velocity and the flow of nozzle throat in the flow controller control air compartment, carry out air leakage rate testing by the pressure measurement instrument.Yet because the computing formula that this standard adopts has bigger dispute, this proving installation is used in Chinese architecture and is not seen example, and control is comparatively complicated.The present invention comes therefrom.
Summary of the invention
The object of the invention is to provide a kind of air leakage amount testing device of clean air conditioning system, and the big and test of flow velocity instability, pressure pressure reduction needs problems such as hand computation when having solved in the prior art air leakage rate testing.
In order to solve these problems of the prior art, technical scheme provided by the invention is:
A kind of air leakage amount testing device of clean air conditioning system, comprise the air compartment that is provided with air inlet, air outlet, restricting element is equipped with in described air compartment inside, described restricting element is divided into the upstream and downstream air compartment with air compartment, described upstream and downstream air compartment connects pressure tester, it is characterized in that the area of section of described air compartment air inlet equals the area of section of air outlet.
Preferably, described restricting element is a standard long-neck nozzle, and described nozzle is fixed on the nozzle blade of fixing with air compartment, and described nozzle ends is provided with forward and backward homogenizing plate; Described front and back homogenizing plate is the porous honeycomb screen that is arranged on air compartment inner nozzle both sides.
Preferably, described air inlet and air outlet are the horn-like indentation pipe that is arranged on the nozzle upstream and downstream, and described indentation pipe two ends are by the flange fixing seal; Described air inlet and air outlet are provided with in opposite directions, and the cross section, air port is reducing and air inlet flaring and air outlet convergent progressively.
Preferably, described air compartment is the tubular air compartment, and described nozzle blade is arranged on the inner periphery at tubular air compartment middle part; Air compartment and back air compartment before described nozzle blade is divided into the tubular air compartment.
Preferably, the indoor circumference of the apoplexy of described nozzle blade and air compartment is affixed; The circumference of air compartment is trapezoidal circumference in described, and described preceding air compartment and back air compartment are by cooperating the sealing of pegging graft with the trapezoidal circumference of middle air compartment; Air compartment is connected with preceding short circuit by indentation pipe air inlet before described; Described back air compartment is tightly connected by indentation pipe air outlet and back short circuit; Described front and back short circuit upper flange fixing seal.
Preferably, on the air compartment circumference outside the described nozzle blade several differential pressure pressure interfaces are set; The distance of described differential pressure pressure interface and nozzle blade is not more than 1.5 times of nozzle throat diameters, and differential pressure pressure interface forms the static pressure ring and is connected with external differential pressure proving installation in the air compartment outside; On the air compartment circumference in the homogenizing plate in the described nozzle downstream outside several static pressure pressure interfaces are set, described static pressure pressure interface is unified into the static pressure ring and is connected with external pressure test device in the air compartment outside; The distance that described static pressure pressure is interfaced to the porous honeycomb screen is not more than 1.5 times of nozzle throat diameters.
Preferably, also be provided with Programmable Logic Controller outside the described device; The differential pressure sensing device that is connected with differential pressure pressure interface is connected with described Programmable Logic Controller respectively with the pressure test device that is connected with static pressure pressure interface; Also be provided with the temperature test device in the described air compartment, described Programmable Logic Controller handle after the data of differential pressure sensing device, temperature test device, pressure test device and with the result feedback with output unit that Programmable Logic Controller is connected on; Described output unit is printer or display screen.
Preferably, pass through preceding shrouding flange fixing seal between described indentation pipe air inlet and preceding air compartment; Pass through back shrouding flange fixing seal between indentation pipe air outlet and back air compartment; Described temperature test device is arranged on the indoor circumference of after wind of nearly back shrouding.
Preferably, described nozzle is selected from stainless steel nozzle or carbon steel material nozzle; Described air compartment is the air compartment that plastic material is made; Described plastic material is selected from PE, UPVC.
Preferably, described device comprises that also the blower fan that is arranged on the air compartment two ends is connected flexible pipe with system, and when adopting the malleation air leakage rate testing, described blower fan connects the air inlet of air compartment, and described air outlet is connected flexible pipe and connects with system; When adopting the negative pressure air leakage rate testing, described system connects flexible pipe and is connected with the air inlet of air compartment, and described air outlet is connected with blower fan; Described blower fan is connected the flange fixing seal by being provided with on the short circuit of front and back between flexible pipe and air port with system; Described blower fan is a frequency conversion fan.
Preferably, described air compartment is a tube-shaped structure, and air compartment inside center place is provided with a low ratio nozzle in the standard long-neck nozzle, and its type selecting can be determined according to user's needs.Nozzle depending nozzle dividing plate is fixed on the inner periphery of tube-shaped structure, each air port that is provided with, both sides, and the nozzle upstream side is an air inlet, the downstream is an air outlet; A porous honeycomb screen that its internal diameter is identical with the ring casing internal diameter is respectively put in the nozzle both sides, a plurality of static pressure pressure interfaces that are distributed in circumference and are not more than 1.5 times of nozzle throat diameters to the distance of nozzle blade are set respectively, and be unified into the static pressure ring in the air compartment outside, join with the pressure measurement instrument then.Be provided with respectively in the nozzle downstream simultaneously and a plurality ofly be distributed in circumference and be not more than the static pressure pressure interface of 1.5 times of nozzle throat diameters to the distance of porous honeycomb screen, static pressure pressure interface is unified into the static pressure ring in the air compartment outside, joins with the pressure test instrument then.It is former and later two ring casings that the air compartment depending nozzle cuts off it, promptly preceding air compartment and back air compartment; In the air compartment all should tightly not leaked the ring casing space of outer connection part and each self-forming of nozzle both sides.The section internal diameter size of air compartment should satisfy the requirement of air-flow average velocity less than 0.75m/s, and the flow velocity by nozzle throat should satisfy the requirement in the 15-35m/s scope.Described standard long-neck nozzle adopts stainless steel or carbon steel to make, and other of described air compartment constitute part and all adopt plastic materials such as PE, UPVC to make.The air compartment both sides respectively are provided with an air port, and described air port is the horn-like structure of cross section reducing, are the heavy in section near the cross section of air compartment side, are small bore away from the cross section of air compartment side.
Adopt the measurement of observing and controlling element, control procedure parameter in the technical solution of the present invention, the observing and controlling element comprises pressure transducer, differential pressure pickup, fan frequency converter, automatic stamper etc., the actual measurement of observing and controlling element, calculating, procedure for displaying parameter value.
Adopt Programmable Logic Controller to calculate, show the value that leaks out in the technical solution of the present invention.Programmable Logic Controller is by the relation curve of the pressure reduction (Δ P) in the legal Measuring and testing department probation redport with flow (Q), and fit to computing formula Q=K (Δ P) 1/2 programming, during field measurement the correlation parameter of system under test (SUT) observing and controlling element actual measurement is imported programmable calculator, the value that leaks out of programmable calculator instant playback particular system.
Preferably, described blower fan is the centrifugal frequency conversion fan of miniaturization.Its type selecting can be determined according to user's needs.Described air compartment, blower fan, Programmable Logic Controller, observing and controlling element etc. are installed concentratedly in a small rectangular bin.
Principle of work of the present invention is: pass through air compartment to system's (pipeline, equipment) forced draft or negative pressure exhausting by centrifugal blower, restricting element is equipped with in air compartment inside---and the low ratio nozzle in the preferred standard long-neck nozzle, it is poor then will static pressure to occur between its upstream and downstream side when the airflow passes restricting element.Wind supply quantity or exhausting amount (being system's inleakage) that system needs are big more, and then the static pressure difference of restricting element upstream and downstream side is big more, can obtain the value that leaks out of particular system by this ultimate principle.Its fundamental relation formula is:
Q=3600*C d*A d*(2ΔP/ρ) 1/2
In the formula: Q---inleakage (m 3/ h)
C d---nozzle orifice coefficient
A d---area of nozzle throat (m 2)
Differential static pressure (Pa) before and after Δ P---the nozzle
Legal Measuring and testing department tests and provides the relation curve of pressure reduction (Δ P) and flow (Q) in probation redport by above-mentioned basic calculating formula, and fit to computing formula Q=K (Δ P) 1/2, Programmable Logic Controller is by this formula programming, during field measurement the correlation parameter of system under test (SUT) observing and controlling element actual measurement is imported programmable calculator, the value that leaks out of programmable calculator instant playback particular system.
The method that adopts air leakage amount testing device of clean air conditioning system of the present invention to carry out air leakage rate testing is carried out according to the following steps:
Choose positive pressure type air leakage amount testing device of clean air conditioning system or negative-pressure type air leakage amount testing device of clean air conditioning system by designing requirement or customer requirements before the test, the positive pressure type air leakage amount testing device of clean air conditioning system, its blower fan is connected on the airflow inlet end, and system connects flexible pipe and is connected on endpiece; The negative-pressure type air leakage amount testing device of clean air conditioning system, its blower fan is connected on airflow outlet end, and system connects flexible pipe and is connected on entrance point.
After this device is transported to the working-yard, by energized shown in the accompanying drawing and will connect airduct and be connected to system under test (SUT) (as airduct, air conditioner etc.);
Connect the Programmable Logic Controller power supply, import the personality (as: pressure system: low pressure, middle pressure, high pressure of specific engineering system; The airduct internal surface area; System works pressure etc.);
Start blower fan, treat to carry out actual measurement work after the pressure indicated value is stabilized in system works pressure;
The differential pressure that the direct-reading differential pressure gauge is shown and with differential pressure value (Pa) input Programmable Logic Controller;
Pressure transducer is from trend Programmable Logic Controller input service force value (Pa);
Fan frequency converter is manually carrying out the electric machine frequency adjustment according to the contrast of system's actual pressure value and setting on the Programmable Logic Controller or on fan frequency converter.With the working pressure value of guaranteeing to set;
Programmable Logic Controller shows measured end value and end value is imported printer that the printer instant playback is also printed the value that leaks out that this time measurement is obtained;
Compared with prior art, positive effect of the present invention is:
1. the area of section that adopts the area of section of air inlet to equal air outlet in the technical scheme of the present invention makes in the device air compartment of the present invention uniform and stable by the flow velocity of nozzle, measurement result when doing air leakage rate testing with this device is more accurate, reliable and stable, and meet the technical requirement of GB50243 national standard.Adopt air inlet and air outlet to be the horn-like indentation pipe that is arranged on the nozzle upstream and downstream in the optimized technical scheme; In the ring casing of front and back the porous honeycomb screen is set and carries out rectification; The air compartment two ends directly link to each other with blower fan by importing and exporting airduct, and the flow controller that the requirement of GB50243 national standard is set up no longer is set, but adopt the fan frequency converter throttling.
2. technical solution of the present invention shows that at the air-conditioning system of building trade, the testing experiment of air cleaning and conditioning system the measurement range of air leakage amount testing device of clean air conditioning system of the present invention is 20-500m3/h, can cover whole air-conditioning systems, air cleaning and conditioning system on-the-spot test scope, so proving installation applied range of the present invention.
3. examine after testing, proving installation measuring accuracy height of the present invention, systematic error is≤2%, has satisfied the technical requirement of national standard to measuring accuracy.
4. air leakage amount testing device of clean air conditioning system of the present invention can adopt automatic control and manually control the method that combines and carry out the data input.The inventor is through studying for a long period of time and constantly practice, make proving installation of the present invention to adjust control system and be control or manually control automatically, solved some working-yard environment such as weak electricity system, control system produces the influence that stronger electromagnetic interference (EMI) is brought test result according to the electromagnetic interference (EMI) situation of engineering site; So proving installation of the present invention antijamming capability at the construction field (site) is strong.
5. air leakage amount testing device of clean air conditioning system of the present invention is simple for structure, on selecting, material makes every effort to inexpensive, practical, cost is comparatively cheap, add that control system of the present invention adopts manually and control automatically the method that combines, thereby saved cost of manufacture greatly, its economic benefit is very remarkable.Adopt Programmable Logic Controller to calculate, show the value that leaks out in the optimized technical scheme, thoroughly avoided on-the-spot hand computation length consuming time, inefficient drawback.
In sum, but device of the present invention is applicable to the working-yard for the air cleaning and conditioning system installation provides a kind of, can reaches the current specifications quality requirements, convenient and practical, the portable air leakage amount testing device of clean air conditioning system that connects direct-reading inleakage behind system interface and the automatic or manual input correlation parameter.Can be applied to contain in the installation engineering of air conditioning wind pipe, air-conditioning unit, air conditioner filter and fire-fighting smoke evacuation system airduct equipment etc.
Description of drawings
Below in conjunction with drawings and Examples the present invention is further described:
Fig. 1 is the structural representation of embodiment of the invention positive pressure purification air-conditioning system air leakage rate testing instrument;
Fig. 2 is the structural representation of embodiment of the invention negative pressure air cleaning and conditioning system air leakage rate testing instrument;
Fig. 3 is the control linkage figure of embodiment of the invention air leakage amount testing device of clean air conditioning system;
Fig. 4 is the air compartment enlarged diagram of embodiment of the invention air leakage amount testing device of clean air conditioning system;
Fig. 5 is the A place enlarged diagram of Fig. 4;
Fig. 6 is that the B of Fig. 4 is to synoptic diagram; Wherein air compartment is a tubular;
Fig. 7 is that the C-C of Fig. 4 is to synoptic diagram;
Fig. 8 is that the B of Fig. 4 is to synoptic diagram; Wherein air compartment is a square tube shape.
Wherein: 1 blower fan, 2. air compartments, 3. systems connect flexible pipe, and 4 is the blower motor frequency converter; 5 is the porous honeycomb screen, and 6 is differential pressure pressure interface; 7 is static pressure pressure interface; 8 is temperature test device, thermal resistance, and 9 are static pressure ring (comprising pressure static pressure ring, differential pressure static pressure ring);
Air compartments before 21,22 back air compartments, air compartment in 23,61 differential pressure pressures chew, 71 chew for the pressure pressure;
101 is the blower fan joint flange, and 102 is coupling bolt, and 103 is preceding short circuit, and 104 is preceding reducing pipe, 105 is the forward flange shrouding, and 106 is the back short circuit, and 107 is preceding porous honeycomb screen, and 108 is the back reducing pipe, 109 is nozzle blade, and 110 is nozzle, and 111 is back porous honeycomb screen, and 112 is the rear flange shrouding.
Embodiment
Below in conjunction with specific embodiment such scheme is described further.Should be understood that these embodiment are used to the present invention is described and are not limited to limit the scope of the invention.The implementation condition that adopts among the embodiment can be done further adjustment according to the condition of concrete producer, and not marked implementation condition is generally the condition in the normal experiment.
Embodiment: as Fig. 1~7, this air leakage amount testing device of clean air conditioning system comprises that frequency conversion fan 1, the air compartment 2 by blower motor frequency converter 4 control of conversion is connected flexible pipe 3 and Programmable Logic Controller with system, is positive pressure purification air-conditioning system air leakage rate testing instrument.The air compartment two ends are provided with air inlet, air outlet respectively, and the area of section of described air inlet equals the area of section of air outlet.Described blower fan connects the air inlet of air compartment, and described air outlet is connected flexible pipe and connects with system.
Be provided with the low ratio nozzle 110 in the standard long-neck nozzle in the air compartment, described nozzle is fixed on the nozzle blade of fixing with air compartment 109, and described nozzle ends is provided with forward and backward porous honeycomb screen 107,111,5.Air inlet and air outlet are the horn-like indentation pipe 104,108 that is arranged on the nozzle upstream and downstream, and described indentation pipe two ends are by the flange fixing seal; Described air inlet and air outlet are provided with in opposite directions, and the cross section, air port is reducing and air inlet flaring progressively; The air outlet indentation.Air compartment is the tubular air compartment, and described nozzle blade is arranged on the inner periphery at tubular air compartment middle part; Air compartment 21 and back air compartment 22 before described nozzle blade is divided into the tubular air compartment.
Middle air compartment 23 inner peripherys of described nozzle blade and air compartment are affixed; The circumference of air compartment is trapezoidal circumference in described, and described preceding air compartment and back air compartment are by cooperating the sealing of pegging graft with the trapezoidal circumference of middle air compartment; Air compartment is connected with preceding short circuit by indentation pipe air inlet before described; Described back air compartment is tightly connected by indentation pipe air outlet and back short circuit; Described front and back short circuit 103,106 upper flange fixing seals.Described blower fan is by blower fan joint flange 101 and air port sealing, and it is fixing to pass through coupling bolt 102; The air port is connected the flange fixing seal by being provided with on the short circuit of back between flexible pipe with system;
On the air compartment circumference in the nozzle blade outside several differential pressure pressure interfaces 6 are set; The distance of described differential pressure pressure interface and nozzle blade is not more than 1.5 times of nozzle throat diameters, and differential pressure pressure interface forms static pressure ring 9 and is connected with external differential pressure proving installation in the air compartment outside; On the air compartment circumference in the homogenizing plate in the described nozzle downstream outside several static pressure pressure interfaces 7 are set, described static pressure pressure interface is unified into the static pressure ring and is connected with external pressure test device in the air compartment outside; The distance that described static pressure pressure is interfaced to the porous honeycomb screen is not more than 1.5 times of nozzle throat diameters.
The differential pressure sensing device that is connected with differential pressure pressure interface is connected with described Programmable Logic Controller respectively with the pressure test device that is connected with static pressure pressure interface; Also be provided with temperature test device 8 in the described air compartment, described Programmable Logic Controller handle after the data of differential pressure sensing device, temperature test device, pressure test device and with the result feedback with printer that Programmable Logic Controller is connected on.
Nozzle is stainless steel nozzle or carbon steel material nozzle; Described air compartment is the air compartment that PE, UPVC plastic material are made.Pass through forward flange shrouding 105 fixing seals between indentation pipe air inlet and preceding air compartment; Pass through rear flange shrouding 112 fixing seals between indentation pipe air outlet and back air compartment; On the indoor circumference of after wind that described temperature test device is arranged on nearly shrouding.
The embodiment of the invention is tested a certain engineering air cleaning and conditioning system airduct inleakage, and this project airduct internal surface area is 53.6m2, working pressure 700Pa, and 10000 grades of lustration classes, by the related specifications regulation, native system is pressed medium voltage network and is measured the airduct inleakage.
Its basic parameter is as follows:
Fluid title: air; Kinematic viscosity γ=15.12*10 -6(20 ℃ time); Density: ρ=1.293Kg/m 3(0 ℃ time); A fluid stream expansion coefficient 1.0,25 ℃ of the environment temperatures during test.
Air cleaning and conditioning system airduct air leakage rate testing instrument is selected:
Adopt positive pressure purification air-conditioning system airduct air leakage rate testing instrument.Proving installation adopts the low ratio nozzle in the standard long-neck nozzle, and its throat section diameter is got d Larynx=38.94mm, measurement range is defined as 60-160m 3/ h.Get d Larynx=38.94mm is when flow is 64-150m 3During/h, the flow velocity by nozzle throat is in the 15-35m/s scope.The compliant requirement.Fan Selection; DF7; Maximum flow 1200m 3/ h; Top hole pressure; 850-1210Pa air compartment cross section internal diameter is 268mm, and the cross section flow velocity of maximum flow calculating is pressed less than 0.75m/s in the air compartment cross section.
Test process:
The appropriate location places this air leakage amount testing device of clean air conditioning system below the tested air-line system of engineering site, connect blower fan 1, observing and controlling element (as the pressure unit among Fig. 3, digital pressure display instrument, mini-printer, blower motor frequency converter), the power supply of Programmable Logic Controller, system is connected flexible pipe 3 is connected to the system under test (SUT) airduct;
Blower fan 1 is by blower fan joint flange 101, and coupling bolt 102, preceding short circuit 103 and air compartment 2 are connected; System under test (SUT) is connected with air compartment 2 by system's connection flexible pipe 3, back short circuit 106; The differential pressure of nozzle 110 front and back, pressure pressure chew 61,71 respectively by differential pressure static pressure ring, and pressure static pressure ring 9 is connected with digital differential pressure gauge, pressure unit; Pressure unit converts the pressure signal that receives to electric signal, by the system transmissions circuit electric signal is transferred to digital pressure display instrument, digital pressure display instrument shows tested force value, tested force value and system works pressure (set-point) are manually contrasted, and, make the shown force value of digital pressure display instrument be stabilized in the working pressure value by the artificial frequency parameter of adjusting the blower motor frequency converter; Digital differential pressure gauge directly shows and manually reads tested differential pressure value, and the tested differential pressure value input Programmable Logic Controller that will read; Thermal resistance in the air compartment is experienced the interior environment temperature of air compartment and by the thermal resistance interface thermoelectric resistance is directly transferred to Programmable Logic Controller; The value that leaks out of this system is immediately calculated and demonstrate to the data that Programmable Logic Controller is directly imported according to the data and the above-mentioned observing and controlling element of artificial input by the formula of having programmed, exactly.
Start blower fan 1 power switch, the air-flow that blower fan produced enters air compartment.Air compartment 21 before after preceding short circuit 103, preceding reducing pipe 104 carry out the air-flow diffusion, entering, carry out the laggard nozzle 110 of current-sharing through preceding porous honeycomb screen 107 again, be expelled to back air compartment 22 from nozzle 110 throats, through back porous honeycomb screen 111 current-sharings, from back reducing pipe 108, afterwards short circuit 106 drains into tested airduct.
In the above-mentioned course of work, the pressure pressure that is positioned at the back air compartment 22 at nozzle 110 rear portions is chewed 61 and is converted the pressure signal that receives to electric signal by pressure static pressure ring 9, pressure unit, by the system transmissions circuit electric signal is transferred to digital pressure display instrument, digital pressure display instrument shows tested force value, tested force value and system works pressure (set-point) are manually contrasted, and, make the shown force value of digital pressure display instrument be stabilized in the working pressure value by the artificial frequency parameter of adjusting blower motor frequency converter 4;
The differential pressure static pressure ring 9 that is positioned at the front and back air compartment 21,22 of nozzle 110 both sides is transferred to digital differential pressure gauge with the pressure signal that receives, and directly demonstration is also manually read tested differential pressure value, and the tested differential pressure value input Programmable Logic Controller that will read; Thermal resistance 8 in the air compartment is experienced the interior environment temperature of air compartment and by the thermal resistance interface thermoelectric resistance is directly transferred to Programmable Logic Controller; The value that leaks out of this system is immediately calculated and demonstrate to the data that Programmable Logic Controller is directly imported according to the data and the above-mentioned observing and controlling element of artificial input by the formula of having programmed, exactly.
Programmable Logic Controller is manually keyed in following data:
Key entry system classification: middle pressure;
Key in S=53.6m 2--system under test (SUT) airduct internal surface area sum (m 2);
Key in P Standard=101.3KPa, P StandardIt is the normal atmospheric pressure (KPa) under 0 ℃;
Keying in P=700 (Pa) P is the actual working pressure (pa) relatively of specific engineering system;
Key in relative working pressure scaled value P Relatively=0.7 (KPa);
Key in T StandardT Standard=273,16 T StandardIt is the Fahrenheit temperature (° K) under 0 ℃;
Keying in Δ p Δ p is pressure reduction (Pa) this engineering measurement Δ p=186 (Pa) behind the actual measurement plate header board.
The Programmable Logic Controller automatic display system value that leaks out.System's calculating process sees the following form:
Table 1 Programmable Logic Controller (PLC) route card
Sequence number Program The result Remarks
1 Key entry system classification V z(middle pressure)
2 Key in S S=63.6m 2 S is specific engineering system under test (SUT) airduct internal surface area sum (m 2)
3 Show A n A n=1.19×10 -3 A nBe area of nozzle throat (m 2)
4 Key in P Standard P Standard=101.325KPa P StandardBe normal atmospheric pressure (KPa)
5 Key in P 700 P is the actual working pressure (p relatively of specific engineering system a) )
6 Show relative working pressure scaled value P Relatively P Relatively=0.7(KPa)
Show P Operating mode P Operating mode=P Standard+P Relatively=102.025 P Operating modeFor the actual absolute work of specific engineering system is pressed
(KPa) Power (KPa) )
Key in T Standard T Standard=293,16 T StandardBe the Fahrenheit temperature under the 20C (° K)
7 Show t 25 T be air-flow actual temperature in the on-the-spot airduct (℃)
Calculate and demonstration T Operating mode T Operating mode=T Standard+t=298.16 T Operating modeBe the actual Fahrenheit temperature of air-flow (° K) in the on-the-spot airduct
9 Key in and demonstration Δ p This engineering measurement Δ p=186 (Pa) Δ p is a pressure reduction (Pa) behind the actual measurement plate header board
12 The extraction of square root value X that shows differential pressure value Δ P X=(ΔP) 1/2=13.638
13 V under the display standard state Standard (m 3/ h) be worth V The ※ standard =5.6158X-0.1979=76.6 V The ※ standard(20C, 101.3KPa) calibration value formula under the standard state that=5.6158X-0.1979 provides for the First Astronautic Research Institute for Measurement and Test
14 Calculate and show and press the V that First Astronautic Research Institute for Measurement and Test's calibration formula calculates The ※ operating mode V The ※ operating mode=(P StandardT Operating modeV The ※ standard)÷ (P Operating modeT Standard) =0.3455T Operating modeV The ※ standard/P Operating mode =77.1 V The ※ operating modeThe value (m that leaks out under the working pressure of calculating for the calibration value formula that provides by the First Astronautic Research Institute for Measurement and Test 3/h)
15 Calculate, show the particular system airduct value (m that allows to leak out 3/h) The middle pressure: V Y≤S×0.0352P 0. 65=158 V YThe value (m that leaks out that allows for standard code 3/h.m 2)
16 Conclusion Qualified System's inleakage is less than the value that leaks out that allows of regulation
In sum, the present invention has overcome the theoretical algorithm defective of GB50243-2002 " code for acceptance of construction quality of conditioning works ".Can the inleakage correlation parameter of all kinds of cleaning system airducts, high, medium and low voltage air conditioning wind pipe system, system equipment accurately be detected by device of the present invention, and the parameter that adopts micro programmable logic controller that the scene is read handles, and can show the value that leaks out of special test system immediately exactly.But this device is applicable to the working-yard, can reaches the current specifications quality requirements, convenient and practical, connect direct-reading inleakage behind system interface and the automatic or manual input correlation parameter, and this device stable and reliable operation, installation, operation and convenient transportation, it is mobile big to adapt to installation enterprises.
Certainly, as Fig. 8, air compartment of the present invention also can be the rectangular parallelepiped air compartment, and air inlet is a rectangle flaring air inlet, and air outlet is a rectangle convergent air inlet, and other structures are as the foregoing description.
Above-mentioned example only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the people who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalent transformations that spirit is done according to the present invention or modification all should be encompassed within protection scope of the present invention.

Claims (10)

1. air leakage amount testing device of clean air conditioning system, comprise the air compartment (2) that is provided with air inlet, air outlet, restricting element is equipped with in described air compartment (2) inside, described restricting element is divided into the upstream and downstream air compartment with air compartment, described upstream and downstream air compartment connects pressure tester, it is characterized in that the area of section of described air compartment air inlet equals the area of section of air outlet.
2, air leakage amount testing device of clean air conditioning system according to claim 1, it is characterized in that described restricting element is a standard long-neck nozzle (110), described nozzle is fixed on the nozzle blade of fixing with air compartment (109), and described nozzle ends is provided with forward and backward homogenizing plate (107,111); Described front and back homogenizing plate is the porous honeycomb screen (107,111) that is arranged on air compartment inner nozzle both sides.
3, air leakage amount testing device of clean air conditioning system according to claim 2 is characterized in that described air inlet and air outlet are the horn-like indentation pipe that is arranged on the nozzle upstream and downstream, and described indentation pipe two ends are by the flange fixing seal; Described air inlet and air outlet are provided with in opposite directions, and the cross section, air port is reducing and air inlet flaring and air outlet convergent progressively.
4, air leakage amount testing device of clean air conditioning system according to claim 2 is characterized in that described air compartment is the tubular air compartment, and described nozzle blade is arranged on the inner periphery at tubular air compartment middle part; Described nozzle blade is divided into preceding air compartment (21) and back air compartment (22) with the tubular air compartment.
5, air leakage amount testing device of clean air conditioning system according to claim 4 is characterized in that middle air compartment (23) inner periphery of described nozzle blade and air compartment is affixed; The circumference of air compartment is trapezoidal circumference in described, and described preceding air compartment and back air compartment are by cooperating the sealing of pegging graft with the trapezoidal circumference of middle air compartment; Air compartment is connected with preceding short circuit (103) by indentation pipe air inlet before described; Described back air compartment is tightly connected by indentation pipe air outlet and back short circuit (106); Described front and back short circuit upper flange fixing seal.
6, air leakage amount testing device of clean air conditioning system according to claim 5 is characterized in that on the air compartment circumference in the described nozzle blade outside several differential pressure pressure interfaces (6) being set; The distance of described differential pressure pressure interface and nozzle blade is not more than 1.5 times of nozzle throat diameters, and differential pressure pressure interface forms static pressure ring (9) and is connected with external differential pressure proving installation in the air compartment outside; On the air compartment circumference in the homogenizing plate in the described nozzle downstream outside several static pressure pressure interfaces (7) are set, described static pressure pressure interface is unified into static pressure ring (9) and is connected with external pressure test device in the air compartment outside; The distance that described static pressure pressure is interfaced to the porous honeycomb screen is not more than 1.5 times of nozzle throat diameters.
7, air leakage amount testing device of clean air conditioning system according to claim 6 is characterized in that the described device outside also is provided with Programmable Logic Controller; The differential pressure sensing device that is connected with differential pressure pressure interface is connected with described Programmable Logic Controller respectively with the pressure test device that is connected with static pressure pressure interface; Also be provided with temperature test device (8) in the described air compartment, described Programmable Logic Controller handle after the data of differential pressure sensing device, temperature test device, pressure test device and with the result feedback with output unit that Programmable Logic Controller is connected on; Described output unit is printer or display screen.
8, air leakage amount testing device of clean air conditioning system according to claim 7 is characterized in that between described indentation pipe air inlet and preceding air compartment by preceding shrouding flange (105) fixing seal; Pass through back shrouding flange (112) fixing seal between indentation pipe air outlet and back air compartment; Described temperature test device is arranged on the indoor circumference of after wind of nearly back shrouding.
9, air leakage amount testing device of clean air conditioning system according to claim 2 is characterized in that described nozzle is selected from stainless steel nozzle or carbon steel material nozzle; Described air compartment is the air compartment that plastic material is made; Described plastic material is selected from PE, UPVC.
10, air leakage amount testing device of clean air conditioning system according to claim 1, it is characterized in that described device comprises that also the blower fan (1) that is arranged on the air compartment two ends is connected flexible pipe (3) with system, when adopting the malleation air leakage rate testing, described blower fan connects the air inlet of air compartment, and described air outlet is connected flexible pipe and connects with system; When adopting the negative pressure air leakage rate testing, described system connects flexible pipe and is connected with the air inlet of air compartment, and described air outlet is connected with blower fan; Described blower fan is connected the flange fixing seal by being provided with on the short circuit of front and back between flexible pipe and air port with system; Described blower fan is a frequency conversion fan.
CN2009201424250U 2009-04-13 2009-04-13 Air leakage volume test device of purification air-conditioning system Expired - Fee Related CN201434752Y (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101532901B (en) * 2009-04-13 2012-05-30 苏州工业设备安装集团有限公司 Air leakage amount testing device of clean air conditioning system
CN102519690A (en) * 2011-12-01 2012-06-27 安徽江淮松芝空调有限公司 Detection mechanism for detecting flowing condition in core body of heat exchanger
CN103033366A (en) * 2012-12-12 2013-04-10 中国船舶重工集团公司第七一一研究所 Spark arrester performance test device
TWI418751B (en) * 2010-04-27 2013-12-11 Delta Electronics Inc Airflow driving device capable of measuring flow capacity and air conditioning equipment using the same
CN105181268A (en) * 2015-05-27 2015-12-23 天津大学建筑设计研究院 Method for measuring air leakage rate of building atrium external window
CN110987410A (en) * 2020-03-02 2020-04-10 宁波均胜群英汽车系统股份有限公司 Airflow detection device
US10684188B2 (en) 2015-11-18 2020-06-16 Carrier Corporation System and method for determining duct leakage in a HVAC system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101532901B (en) * 2009-04-13 2012-05-30 苏州工业设备安装集团有限公司 Air leakage amount testing device of clean air conditioning system
TWI418751B (en) * 2010-04-27 2013-12-11 Delta Electronics Inc Airflow driving device capable of measuring flow capacity and air conditioning equipment using the same
CN102519690A (en) * 2011-12-01 2012-06-27 安徽江淮松芝空调有限公司 Detection mechanism for detecting flowing condition in core body of heat exchanger
CN103033366A (en) * 2012-12-12 2013-04-10 中国船舶重工集团公司第七一一研究所 Spark arrester performance test device
CN103033366B (en) * 2012-12-12 2015-04-15 中国船舶重工集团公司第七一一研究所 Spark arrester performance test device
CN105181268A (en) * 2015-05-27 2015-12-23 天津大学建筑设计研究院 Method for measuring air leakage rate of building atrium external window
CN105181268B (en) * 2015-05-27 2017-09-12 天津大学建筑设计研究院 The assay method of Architectural Atrium exterior window inleakage
US10684188B2 (en) 2015-11-18 2020-06-16 Carrier Corporation System and method for determining duct leakage in a HVAC system
CN110987410A (en) * 2020-03-02 2020-04-10 宁波均胜群英汽车系统股份有限公司 Airflow detection device
CN110987410B (en) * 2020-03-02 2020-06-23 宁波均胜群英汽车系统股份有限公司 Airflow detection device

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