CN109387351B - Air cooling flow resistance testing method and device - Google Patents
Air cooling flow resistance testing method and device Download PDFInfo
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- CN109387351B CN109387351B CN201811572286.5A CN201811572286A CN109387351B CN 109387351 B CN109387351 B CN 109387351B CN 201811572286 A CN201811572286 A CN 201811572286A CN 109387351 B CN109387351 B CN 109387351B
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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
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
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Abstract
The embodiment of the invention provides an air cooling flow resistance testing method, wherein the method comprises the following steps: connecting an air-cooled flow resistance tester to the tested equipment through a pipeline; setting the voltage of the air cooling flow resistance tester to a working voltage; starting a fan of the air cooling flow resistance tester to work to obtain at least three air quantities Q; a fan function is called in a programmable controller of the air cooling flow resistance tester; calculating at least three corresponding flow resistances P according to the fan function and the at least three air quantities Q; and fitting at least three air volumes Q and at least three corresponding flow resistances P to obtain a flow resistance curve of the equipment to be tested.
Description
Technical Field
The reliability technology research of the mechanical structure of the electronic equipment.
Background
When the electronic equipment carries out flow resistance test, an air volume tester is usually required to test the air volume and an inclined tube pressure gauge is usually required to measure the air pressure at an inlet, so that the repeated measurement of the air volume and the air pressure at the inlet is time-consuming and labor-consuming.
Disclosure of Invention
The embodiment of the invention provides an air cooling flow resistance testing method and device, wherein the air volume and the air pressure can be visualized, and the flow resistance can be tested quickly.
The first invention, the air cooling flow resistance test method provided by the embodiment of the invention, comprises:
connecting an air-cooled flow resistance tester to the tested equipment through a pipeline;
setting the voltage of the air cooling flow resistance tester to a working voltage;
starting a fan of the air cooling flow resistance tester to work to obtain at least three air quantities Q;
a fan function is called in a programmable controller of the air cooling flow resistance tester;
calculating at least three corresponding flow resistances P according to the fan function and the at least three air quantities Q;
and fitting at least three air volumes Q and at least three corresponding flow resistances P to obtain a flow resistance curve of the equipment to be tested.
Optionally, after the obtaining of the flow resistance curve of the device under test, the method further includes:
and displaying the flow resistance curve.
Optionally, if the difference between the cross-sectional areas of the air outlet of the air-cooled flow resistance tester and the air inlet of the tested device is greater than a preset value, the flow resistance P is adjusted according to the actually measured pressure loss coefficient.
In a second aspect of the present invention, an air-cooled flow resistance testing apparatus is provided in an embodiment of the present invention, where the apparatus includes: power (1), adjustable amount of wind fan (2), volumetric flowmeter (3), flow collector (4), flow display device (5), programmable controller (6) and flow resistance display device (7), wherein:
the power supply (1) is connected with the air volume adjustable fan (2), and the volume flow meter (3) is arranged in the air outlet direction of the air volume adjustable fan (2);
the flow collector (4) is used for collecting the air quantity Q;
the flow display device (5) is used for displaying the air quantity Q and inputting the air quantity Q into the programmable controller (6);
the programmable controller (6) is used for calculating a flow resistance P;
the flow resistance display device (7) is used for displaying the flow resistance P.
The air-cooled flow resistance testing device provided by the embodiment of the invention can be used for quickly testing the flow resistance of electronic equipment, the air volume and the air pressure are both visual, and meanwhile, the influence of different air volumes on the equipment can be inspected when the equipment is debugged.
Drawings
FIG. 1 is a first exemplary diagram provided by the present invention;
FIG. 2 is a second exemplary diagram provided by the present invention;
FIG. 3 is a third example of the present invention.
Detailed Description
The internal structure of the portable air-cooled flow resistance tester is shown in figure 1:
the equipment comprises the following components: the power supply 1 is connected with the air volume adjustable fan 2, a volume flowmeter 3 is arranged in the air outlet direction of the fan, a flow value is collected by a flow collector 4 and displayed through a flow display device 5, and meanwhile, the flow value is input into a programmable controller 6, so that the flow resistance of the equipment can be calculated and displayed through a flow resistance display device 7.
The working principle is as follows:
the flow resistance P of the ventilation device is generally proportional to the wind speed v squared, and the relationship is as follows:
where k is the drag coefficient, ρ is the air density, and the flow Q is related to the wind speed v as follows:
where A is the cross-sectional area of the air path, the resistance to flow of the device is therefore also proportional to the square of the flow Q.
The wind volume adjustable fan can output several different working curves under the control of voltage, and the wind volume and wind pressure of each curve can be fitted into a known function and stored in a programmable controller, as shown in fig. 2.
When the portable air-cooled flow resistance tester is connected with the tested equipment and the fan is turned on to work, the intersection point of the relation curve of the flow resistance of the equipment and the flow and the working curve of the fan is the actual working point ( points 1, 2, 3 and 4) of the whole testing system. As shown in fig. 3.
The actual working point air volume of the test system can be read and displayed through a built-in volume flowmeter, and the obtained air volume value is brought into a previously formulated fan working curve function to calculate and display the resistance value of the test system.
If the difference between the sectional areas of the air outlet of the tester and the air inlet of the tested device is large, the calculated pressure value should be properly adjusted according to experience and the actually measured pressure loss coefficient.
The equipment working process is as follows:
connecting the portable air-cooled flow resistance tester to the tested equipment through a pipeline;
and turning on a power supply, setting the voltage to a specified value 1, starting the fan, and recording the air volume Q1 read by the volume flow meter at the moment. Meanwhile, the function 1 called in the programmable controller in the equipment can calculate the corresponding flow resistance P1 by taking Q1 as an input value;
and turning on a power supply, setting the voltage to a specified value 2, starting the fan, and recording the air volume Q2 read by the volume flow meter at the moment. Meanwhile, a function 2 called in the programmable controller in the equipment can calculate a corresponding flow resistance P2 by taking Q2 as an input value;
and repeating the above processes in sequence, and performing numerical fitting on the obtained corresponding P, Q values to obtain the flow resistance curve of the equipment.
Electronic equipment usually needs air volume tester test amount of wind and pipe chute pressure gauge to measure the entry wind pressure when carrying out the flow resistance test, and is more time-consuming and energy-consuming, designs a portable forced air cooling flow resistance tester now, and its amount of wind and wind pressure all can realize visually, can carry out the flow resistance test fast.
In conclusion, the protection mode is composed of the working principle and the internal structure of the portable air-cooling flow resistance tester. The protection reason is that the flow resistance test can be rapidly carried out on the electronic equipment, and meanwhile, the influence of different air volumes on the equipment can be inspected when the equipment is debugged.
Claims (4)
1. An air cooling flow resistance testing method is characterized by comprising the following steps:
connecting an air-cooled flow resistance tester to the tested equipment through a pipeline;
setting the voltage of the air cooling flow resistance tester to at least three working voltages;
starting to work by a fan of the air cooling flow resistance tester, and obtaining at least three corresponding air quantities Q according to the at least three working voltages;
the fan function is called in a programmable controller of the air cooling flow resistance tester, wherein the fan is controlled by working voltage to output a plurality of different working curves, and the fan function is synthesized by the air volume and the air pressure of each curve and stored in the programmable controller;
calculating at least three corresponding flow resistances P according to the fan function and the at least three air quantities Q;
and fitting at least three air volumes Q and at least three corresponding flow resistances P to obtain a flow resistance curve of the equipment to be tested.
2. The method of claim 1, wherein after said deriving a flow resistance curve for the device under test, the method further comprises:
and displaying the flow resistance curve.
3. The method of claim 1,
and if the difference between the sectional areas of the air outlet of the air-cooled flow resistance tester and the air inlet of the tested device is larger than a preset value, the flow resistance P is adjusted according to the actually measured pressure loss coefficient.
4. An air-cooled flow resistance testing device, characterized in that the device comprises: power (1), adjustable amount of wind fan (2), volumetric flowmeter (3), flow collector (4), flow display device (5), programmable controller (6) and flow resistance display device (7), wherein:
the power supply (1) is connected with the air quantity adjustable fan (2), the volume flow meter (3) is arranged in the air outlet direction of the air quantity adjustable fan (2), the air quantity adjustable fan (2) is controlled by working voltage to output a plurality of different working curves, and the air quantity and the air pressure of each curve can be fitted into a fan function and stored in the programmable controller (6);
the flow collector (4) is used for collecting the air quantity Q;
the flow display device (5) is used for displaying the air quantity Q and inputting the air quantity Q into the programmable controller (6);
the programmable controller (6) is used for storing a fan function and calculating a flow resistance P;
the flow resistance display device (7) is used for displaying the flow resistance P.
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| CN201811572286.5A CN109387351B (en) | 2018-12-21 | 2018-12-21 | Air cooling flow resistance testing method and device |
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| CN201811572286.5A CN109387351B (en) | 2018-12-21 | 2018-12-21 | Air cooling flow resistance testing method and device |
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| CN109387351B true CN109387351B (en) | 2020-09-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2784192B2 (en) * | 1988-09-22 | 1998-08-06 | 株式会社日立製作所 | Hot film type air flow meter |
| CN101750470A (en) * | 2008-12-17 | 2010-06-23 | 中国石油天然气股份有限公司 | Performance testing device for gas pipeline drag reduction agent |
| CN102539110A (en) * | 2010-12-20 | 2012-07-04 | 西安开容电子技术有限责任公司 | Wind resistance character testing device and design method thereof |
| CN202485726U (en) * | 2011-12-24 | 2012-10-10 | 中国航空工业集团公司沈阳飞机设计研究所 | Pipeline flow measuring system applied in closed oil tank |
| CN102722623B (en) * | 2012-06-08 | 2015-04-29 | 中国航空工业集团公司西安飞机设计研究所 | Method for metering air volume of airplane air cooling generator |
| CN102735416A (en) * | 2012-06-28 | 2012-10-17 | 浪潮电子信息产业股份有限公司 | Method for testing pressure-flow (P-Q) performance and flow resistance performance of high-flow large-size system |
| DE102016008973A1 (en) * | 2016-07-22 | 2018-01-25 | Gerd Halbeis | Wind indicator as wind vane with integrated speedometer |
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Non-Patent Citations (1)
| Title |
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| 微流控器件中的多相流动;陈晓东等;《力学进展》;20150115;全文 * |
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