CN109029869A - A kind of air tightness test-bed flow calibrating device and scaling method - Google Patents
A kind of air tightness test-bed flow calibrating device and scaling method Download PDFInfo
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- CN109029869A CN109029869A CN201811274282.9A CN201811274282A CN109029869A CN 109029869 A CN109029869 A CN 109029869A CN 201811274282 A CN201811274282 A CN 201811274282A CN 109029869 A CN109029869 A CN 109029869A
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- pressure
- pressure acquisition
- air tightness
- tightness test
- acquisition case
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The present invention relates to body of a motor car air-leakage test technical field, in particular to a kind of air tightness test-bed flow calibrating device and scaling method.It includes accessory fan, pressure acquisition case and venture tube；The accessory fan entrance is exported with the pressure acquisition case and is connected to by the first bellows；The pressure acquisition tank inlet is exported with the venture tube and is connected to by the second bellows, is equipped with connecting flange between second bellows and the venture tube.The technical problem to be solved by the present invention is to the low problems of air tightness test-bed measuring accuracy, and then provide a kind of air tightness test-bed flow calibrating device and scaling method, can effectively improve the measuring accuracy of air tightness test-bed.
Description
Technical field
The present invention relates to body of a motor car air-leakage test technical field, in particular to a kind of air tightness test-bed flow calibration
Device and scaling method.
Background technique
It in automobile research process, needs to test vehicle body air-tightness, needs to test under normal circumstances in different pressures
The leakage rate of power under body.It is therefore desirable to the air tightness test-bed for testing vehicle body leakage rate needs certain measuring accuracy, one
As its measuring accuracy less than 5%.
Currently, the measuring accuracy of air tightness test-bed needs to be guaranteed by the delta pressure sensor accuracy of its own, when pressure difference passes
When sensor precision is deteriorated, the measuring accuracy of air tightness test-bed just not can guarantee, and test result is caused biggish deviation occur
Even there is mistake.
Therefore, it in order to further increase the measuring accuracy of air tightness test-bed, needs to demarcate it.
Summary of the invention
The technical problem to be solved by the present invention is to the low problems of air tightness test-bed measuring accuracy, and then provide a kind of gas
Tightness test platform flow calibrating device and scaling method can effectively improve the measuring accuracy of air tightness test-bed.
The purpose of the present invention is what is realized by following technical proposals:
A kind of air tightness test-bed flow calibrating device comprising accessory fan, pressure acquisition case and venture tube；
The accessory fan entrance is exported with the pressure acquisition case and is connected to by the first bellows；
The pressure acquisition tank inlet is exported with the venture tube and is connected to by the second bellows, second ripple
Connecting flange is installed between pipe and the venture tube.
Further, the pressure acquisition case includes cabinet；Described cabinet one end opens up air inlet, and the other end offers out
Port；It is equipped with partition in the cabinet, more than two nozzles, the inlet end of more than two nozzles are installed on the partition
It is equipped with detachable closure；Pressure acquisition devices connecting hole, the pressure are offered on the cabinet wall of the partition two sides
Power collector connecting hole is communicated with first pressure collector.
Further, the pressure acquisition chamber interior wall is equipped with second pressure collector, second pressure collector position
In the pressure acquisition case inlet end
Further, current stabilization net is equipped in the pressure acquisition case.
Further, the venture tube arrival end is equipped with temperature sampler.
A kind of scaling method according to any description above air tightness test-bed flow calibrating device comprising following step
It is rapid:
The first step adjusts venture tube, is located at working condition；
Second step opens accessory fan；
Third step adjusts pressure acquisition case, accessory fan, the ginseng detected to the pressure acquisition case, venture tube
After number is stablized, the pressure acquisition case is read, the parameter that the venture tube detects；
4th step, the parameter detected using the pressure acquisition case, the venture tube are calculated through the pressure
The gas flow of vasculum, the venture tube；
5th step, the gas flow that the pressure acquisition case, the venturi flow that comparing calculation obtains pass through calculate gas
Tightness test platform correction factor.
Further, in third step, the collected parameter of pressure acquisition case includes: that second pressure collector detects
Static pressure p, first pressure collector detect pressure differential deltap p1；The collected parameter of venture tube includes: the Wen
The pressure differential deltap p that flowmeter detects2, the temperature T that detects of temperature sampler.
Further, in third step, by adjusting the quantity for the nozzle for participating in work in the pressure acquisition case, it is ensured that pressure
Poor Δ p1Within the scope of 150-650Pa.
Further, in third step, by adjusting the revolving speed of the accessory fan, it is ensured that static pressure p reaches predetermined value.
Further, in the 5th step, air tightness test-bed correction factor λ is calculated by following equation,
λ=q2/q1
Wherein, q1The gas flow detected for the pressure acquisition case；
q2The gas flow detected for the venture tube.
The invention has the following advantages over the prior art:
1. air tightness test-bed flow calibrating device of the present invention comprising accessory fan, pressure acquisition case and Wen
Flowmeter；The accessory fan entrance is exported with the pressure acquisition case and is connected to by the first bellows；The pressure acquisition case
Entrance is exported with the venture tube and is connected to by the second bellows, between second bellows and the venture tube
Connecting flange is installed；After starting the accessory fan, gas passes sequentially through the venture tube, the pressure acquisition case；
It is identical as the gas flow of the pressure acquisition case by the venture tube；The measurement accuracy of the venture tube is high,
It is compared according to the venture tube measurement result and the pressure acquisition case measurement result, the pressure acquisition case is surveyed
Amount result is demarcated, and the measurement accuracy of the pressure acquisition case is improved, that is, improves the air tightness test-bed flow measurement essence
Degree.
Detailed description of the invention
Fig. 1 is air tightness test-bed flow calibrating device structure chart of the present invention；
Fig. 2 is pressure acquisition box structure figure of the present invention；
Wherein, 1- pressure acquisition case, 101- second pressure collector, 102- cabinet, 103- first pressure collector, 104-
Current stabilization net, 105- nozzle, 106- detachably block, 107- air inlet, 108- partition, the gas outlet 109-, the second bellows of 2-, 3-
Connecting flange, 4- venture tube, 401- temperature sampler, 5- accessory fan, the first bellows of 6-.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
Referring to Fig. 1, a kind of air tightness test-bed flow calibrating device comprising accessory fan 5, pressure acquisition case 1 and text
Family name's flowmeter 4；The accessory fan entrance is connected to pressure acquisition case outlet by the first bellows 6；The pressure is adopted
Collection tank inlet is connected to venture tube outlet by the second bellows 2, second bellows and the venturi flow
Connecting flange 3 is installed between meter；After starting the accessory fan, gas passes sequentially through the venture tube, the pressure
Vasculum；It is identical as the gas flow of the pressure acquisition case by the venture tube；The measurement of the venture tube
Precision is high, is compared according to the venture tube measurement result and the pressure acquisition case measurement result, to the pressure
Vasculum measurement result is demarcated, and the measurement accuracy of the pressure acquisition case is improved, that is, improves the air tightness test-bed stream
Measure accuracy of measurement.
Referring to Fig. 1, Fig. 2, pressure acquisition case of the present invention includes cabinet 102；Described cabinet one end opens up air inlet
107, the other end offers gas outlet 109；It is equipped with partition 108 in the cabinet, more than two nozzles are installed on the partition
105, the inlet end of more than two nozzles is equipped with detachable closure 106；On the cabinet wall of the partition two sides
Pressure acquisition devices connecting hole is offered, the pressure acquisition devices connecting hole is communicated with first pressure collector 103；Described
One pressure acquisition devices are used to measure the gas pressure of the partition two sides, for calculating two pressure differences of the partition；Open institute
State the detachable closure on nozzle, the nozzle investment application, by adjusting the quantity for putting into the nozzle, described in guarantee
Pressure difference between partition is in suitable range, when differential pressure is smaller, reduces the quantity for putting into the nozzle, when pressure difference is larger,
It increases input the quantity of the nozzle.
Referring to Fig. 1, Fig. 2, pressure acquisition chamber interior wall of the present invention be equipped with second pressure collector 101, described second
Pressure acquisition devices are located at the inlet end of the pressure acquisition case；The second pressure collector is for measuring the pressure acquisition case
Interior static pressure improves the pressure acquisition case measurement accuracy for calculating in the pressure acquisition case through gas flow.
Referring to Fig. 1, Fig. 2, current stabilization net 104 is equipped in pressure acquisition case of the present invention；The current stabilization net can make described
The flowing of pressure acquisition case interior air-flow is steady, so that the stream pressure of the partition two sides is evenly distributed in the pressure acquisition case,
Improve the accuracy of gas flow pressure measurement.
Referring to Fig. 1, Fig. 2, venture tube arrival end of the present invention is equipped with temperature sampler 401；The temperature acquisition
Device is used to measure the temperature in the venture tube by gas, for calculating in the venture tube through gas stream
Amount, improves the venture tube measurement accuracy.
Referring to Fig. 1, Fig. 2, a kind of scaling method according to any description above air tightness test-bed flow calibrating device,
The following steps are included:
The first step adjusts venture tube, is located at working condition；Adjust four spiral shells of the venture tube bottom
Bolt makes the venture tube be in horizontality, and passes through the liquid level adjusting device of the venture tube, makes its graduated scale
Zero；
Second step opens accessory fan；
Third step adjusts pressure acquisition case, accessory fan, the ginseng detected to the pressure acquisition case, venture tube
After number is stablized, the pressure acquisition case is read, the parameter that the venture tube detects；The pressure acquisition case is collected
Parameter includes: that second pressure collector the static pressure p, the first pressure collector that detect detect pressure differential deltap p1；Wen's stream
The collected parameter of meter includes: the pressure differential deltap p that the venture tube detects2, the temperature T that detects of temperature sampler；
By adjusting the quantity for the nozzle for participating in work in the pressure acquisition case, it is ensured that pressure differential deltap p1Within the scope of 150-650Pa,
When differential pressure is smaller, the quantity for putting into the nozzle, when pressure difference is larger, the quantity for the nozzle of increasing input are reduced；Pressure differential deltap p1
When within the scope of 150-650Pa, measuring accuracy is higher；By adjusting the revolving speed of the accessory fan, it is ensured that static pressure p reaches
Predetermined value；The predetermined value of static pressure p generally chooses the pressure value applied when detection body of a motor car tightness, improves the pressure acquisition
Measurement accuracy of the case when static pressure p is predetermined value.
4th step, the parameter detected using the pressure acquisition case, the venture tube are calculated through the pressure
The gas flow of vasculum, the venture tube；The gas stream that the pressure acquisition case detects is calculated using following equation
Measure q1, the gas flow q that detects of the venturi flow2,
Wherein, c1For the pressure acquisition case discharge coefficient；
c2For the venture tube discharge coefficient；
ρ is fluid density；
5th step, the gas flow that the pressure acquisition case, the venturi flow that comparing calculation obtains pass through calculate gas
Tightness test platform correction factor；Air tightness test-bed correction factor λ is calculated by following equation,
λ=q2/q1
Wherein, q1The gas flow detected for the pressure acquisition case；
q2The gas flow detected for the venture tube.
According to obtained air tightness test-bed correction factor λ, the gas flow that the pressure acquisition case detects is corrected, it is right
The air tightness test-bed is demarcated.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (10)
1. a kind of air tightness test-bed flow calibrating device, it is characterised in that: flowed including accessory fan, pressure acquisition case and Wen
Meter；
The accessory fan entrance is exported with the pressure acquisition case and is connected to by the first bellows；
The pressure acquisition tank inlet and the venture tube are exported to be connected to by the second bellows, second bellows and
Connecting flange is installed between the venture tube.
2. air tightness test-bed flow calibrating device according to claim 1, it is characterised in that: the pressure acquisition luggage
Include cabinet；Described cabinet one end opens up air inlet, and the other end offers gas outlet；Partition, the partition are equipped in the cabinet
On more than two nozzles are installed, the inlet end of more than two nozzles is equipped with detachable closure；The partition two sides
Pressure acquisition devices connecting hole is offered on the cabinet wall, the pressure acquisition devices connecting hole is communicated with first pressure and adopts
Storage.
3. air tightness test-bed flow calibrating device according to claim 2, it is characterised in that: in the pressure acquisition case
Wall is equipped with second pressure collector, and the second pressure collector is located at the inlet end of the pressure acquisition case.
4. air tightness test-bed flow calibrating device according to claim 2, it is characterised in that: in the pressure acquisition case
Equipped with current stabilization net.
5. air tightness test-bed flow calibrating device according to claim 1, it is characterised in that: the venturi flow is included in
Mouth end is equipped with temperature sampler.
6. it is a kind of according to claim 1 in -5 any air tightness test-bed flow calibrating device scaling method, feature
It is, comprising the following steps:
The first step adjusts venture tube, is located at working condition；
Second step opens accessory fan；
Third step, adjusts pressure acquisition case, accessory fan, and the parameter detected to the pressure acquisition case, venture tube is steady
After fixed, the pressure acquisition case is read, the parameter that the venture tube detects；
4th step is calculated using the parameter that the pressure acquisition case, the venture tube detect through the pressure acquisition
The gas flow of case, the venture tube；
5th step, the gas flow that the pressure acquisition case, the venturi flow that comparing calculation obtains pass through calculate air-tightness
Testing stand correction factor.
7. air tightness test-bed flow calibration method according to claim 6, which is characterized in that in third step, the pressure
The collected parameter of power vasculum includes: that second pressure collector the static pressure p, the first pressure collector that detect detect pressure difference
Δp1；The collected parameter of venture tube includes: the pressure differential deltap p that the venture tube detects2, temperature sampler
The temperature T detected.
8. air tightness test-bed flow calibration method according to claim 7, it is characterised in that: in third step, pass through tune
The quantity of the nozzle of work is participated in the whole pressure acquisition case, it is ensured that pressure differential deltap p1Within the scope of 150-650Pa.
9. air tightness test-bed flow calibration method according to claim 7, it is characterised in that: in third step, pass through tune
The revolving speed of the whole accessory fan, it is ensured that static pressure p reaches predetermined value.
10. air tightness test-bed flow calibration method according to claim 7, it is characterised in that: in the 5th step, under
Column formula calculates air tightness test-bed correction factor λ,
λ=q2/q1
Wherein, q1The gas flow detected for the pressure acquisition case；
q2The gas flow detected for the venture tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811274282.9A CN109029869A (en) | 2018-10-29 | 2018-10-29 | A kind of air tightness test-bed flow calibrating device and scaling method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811274282.9A CN109029869A (en) | 2018-10-29 | 2018-10-29 | A kind of air tightness test-bed flow calibrating device and scaling method |
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| CN201811274282.9A Pending CN109029869A (en) | 2018-10-29 | 2018-10-29 | A kind of air tightness test-bed flow calibrating device and scaling method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101303367A (en) * | 2008-07-09 | 2008-11-12 | 上海理工大学 | Standard flow type micro wind speed calibration apparatus and calibration method thereof |
| CN201828290U (en) * | 2010-10-29 | 2011-05-11 | 上海德尔福汽车空调系统有限公司 | Multifunctional blast volume test bed |
| CN202216724U (en) * | 2011-09-26 | 2012-05-09 | 上海佐竹冷热控制技术有限公司 | Multipurpose device for measuring small air volume |
| CN108072410A (en) * | 2017-12-26 | 2018-05-25 | 潍柴动力股份有限公司 | Air flow meter detecting system |
-
2018
- 2018-10-29 CN CN201811274282.9A patent/CN109029869A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101303367A (en) * | 2008-07-09 | 2008-11-12 | 上海理工大学 | Standard flow type micro wind speed calibration apparatus and calibration method thereof |
| CN201828290U (en) * | 2010-10-29 | 2011-05-11 | 上海德尔福汽车空调系统有限公司 | Multifunctional blast volume test bed |
| CN202216724U (en) * | 2011-09-26 | 2012-05-09 | 上海佐竹冷热控制技术有限公司 | Multipurpose device for measuring small air volume |
| CN108072410A (en) * | 2017-12-26 | 2018-05-25 | 潍柴动力股份有限公司 | Air flow meter detecting system |
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Application publication date: 20181218 |
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