CN105716764B - Method for measuring and comparing fan efficiency - Google Patents
Method for measuring and comparing fan efficiency Download PDFInfo
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- CN105716764B CN105716764B CN201510845138.6A CN201510845138A CN105716764B CN 105716764 B CN105716764 B CN 105716764B CN 201510845138 A CN201510845138 A CN 201510845138A CN 105716764 B CN105716764 B CN 105716764B
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- 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
Abstract
The invention relates to a method for measuring and comparing fan efficiency, which obtains the efficiency of a driving fan by measuring the relative voltage value of a driven fan, wherein the measurement is implemented under the environment based on a wind tunnel and specifically comprises a driving fan for air suction, an auxiliary fan for air blowing, a driven fan for measuring relative voltage, a universal meter, a USB (universal serial bus) serial port, an ECU (electronic control unit) controller, a wire harness and a ventilation pipeline.
Description
Technical Field
The invention relates to the technical field of fans, in particular to a fan efficiency measuring method for a heat dissipation system of a passenger car or a bus.
Background
During the running process of passenger cars and buses, engines of the passenger cars and the buses can generate a large amount of heat, so that the heat dissipation efficiency of an engine heat dissipation system is directly influenced by the efficiency of a fan, the heat dissipation efficiency of different fan models is different, and even if the heat dissipation efficiency of fans of the same model is different, a method for finding proper fan efficiency is more important, and the performance of the whole car heat dissipation system is more intuitively influenced.
The method comprises the steps of finding a plurality of test points on a cross section, calculating a specific wind speed value of each point, then calculating an average value of the wind speed values, and finally multiplying the average value by the area of the cross section to obtain the wind volume, wherein the larger the wind volume is, the higher the efficiency of the fan is, but the whole measuring process is complex, the larger the error is, the equipment cost is high, and the current rapid and accurate measuring requirement is difficult to meet. Besides, there are other techniques for measuring the air volume, such as measuring the air volume with an orifice plate, measuring the air volume with a tapered inlet, and measuring the air volume with an ISO venturi nozzle, but these methods cannot accurately measure the air volume of a fan.
Disclosure of Invention
In order to solve the problems of complex measuring process, large error, high equipment cost and the like in the existing method for measuring the efficiency of the fan, the invention provides a solution, and the solution provides a method for measuring and comparing the efficiency of the fan.
The invention obtains the efficiency of the driving fan by measuring the relative voltage value of the driven fan, the implementation of the measurement is carried out under the environment based on the wind tunnel, and the measurement specifically comprises the driving fan for air suction, the auxiliary fan for air blowing, the driven fan for measuring the relative voltage, a universal meter, a USB serial port, an ECU controller, a wire harness and a ventilating duct. Inside the whole ventilation pipeline, an auxiliary fan, a driven fan and a driving fan are sequentially arranged from left to right, the auxiliary fan is used for blowing air, the driving fan is used for sucking air, a wind tunnel is formed inside the pipeline, the wind direction is from left to right, the driven fan is fixed at the air inlet of the wind tunnel, blades are driven to rotate by utilizing the passing air flow to output alternating voltage, a stabilized voltage supply or a switching power supply is externally connected to the end of the driving fan to control the input voltage of the driving fan to be a certain value, the rotating speed of the fan is controlled by an ECU controller when different driving fans are replaced, so that the input current of each driving fan is the same amount, different driving fans are all in the same input condition, the relative voltage measured at the position of the driven fan has comparability and effectiveness, the driven fan adopts three phases, and only the voltage between two phases needs to be measured when the relative voltage value is measured, the larger the relative voltage value is, the higher the efficiency of the fan is, and the better heat dissipation effect can be achieved when the fan is installed on a heat dissipation system of an automobile engine.
The invention does not adopt a pitot tube to measure the wind volume of the wind tunnel to obtain the fan efficiency, but achieves the desired result by measuring the relative voltage value of the driven fan, the whole measuring process is simple and convenient, the measuring error is smaller than that of the pitot tube method, and the current requirement for quickly and accurately measuring the fan efficiency can be met.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a system configuration diagram (1, driving fan, 2, driven fan, 3, auxiliary fan, 4, wind direction of wind tunnel, 5, multimeter, 6, ECU controller, 7, USB serial port) of a method for measuring and comparing fan efficiency.
FIG. 2 is test data for an apparatus for measuring comparative fan efficiency.
FIG. 3 is a graph of driving fan speed versus driven fan output voltage.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Fig. 1 is a system structure diagram of the present invention, the system includes a driving fan 1 for air suction, an auxiliary fan 3 for air blowing, a driven fan 2 for measuring relative voltage, a multimeter 5, an ECU controller 6 for controlling the fan rotation speed, a USB serial port 7 and a ventilation duct, the implementation of the measurement is performed in an environment based on a wind tunnel, and the length of the whole wind tunnel is about 2000 mm. It can be seen from fig. 1 that the auxiliary blower 3 for blowing, the driven blower 2 for measuring the relative voltage and the driving blower 1 for sucking wind are sequentially arranged in the whole pipeline from left to right, the wind direction 4 of the wind tunnel is also from left to right, two phase ports of the driven blower 2 are connected to the positive and negative terminals of the multimeter 5, the driving blower 1 is connected with an ECU controller 6 through a USB serial port 7, and the controller 6 can adjust the rotating speed of the driving blower 1. The auxiliary fan 3 is used for blowing, the driving fan 1 is used for sucking air, a wind tunnel is formed in the pipeline, the driven fan 2 is fixed at the air inlet of the wind tunnel, the blades are driven to rotate by utilizing the passing air flow to output alternating current voltage, a stabilized voltage power supply or a switching power supply is externally connected to the end of the driving fan 1 to control the input voltage of the driving fan to be a certain value, the rotating speed of the fan is required to be adjusted by the ECU controller 6 when different driving fans 1 are replaced, so that the input current of each driving fan 1 is the same, different driving fans 1 are all in the same input condition, the relative voltage measured at the driven fan 2 has comparability and validity, the driven fan 2 adopts three-phase electricity, the larger the relative voltage value is, the higher the efficiency of the fan is indicated, therefore, the efficiency of the driving fan 1 can be obtained by measuring the relative voltage value of the driven fan 2, and the measurement requirement is met.
The output voltage values of the driven fans when the rotating speed of the driving fan is 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, 2800, 2900, 3000 and 3100rpm are shown in fig. 2, the output voltage values are obtained by repeatedly measuring for 4 times under the same condition, then the rotating speed of the driving fan is taken as an x axis, the average value of the output voltage is taken as a y axis to draw a curve, and particularly, as shown in fig. 3, it can be seen that the output relative voltage value is increased and the air volume is increased along with the increase of the rotating speed of the driving fan, and the average air volume change is basically consistent every 100rpm is increased, the testing method can accurately compare the air volume, and the output voltage can reflect the efficiency of the driving fan.
The embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (6)
1. A method for measuring and contrasting the efficiency of a fan, the implementation of the measurement is carried out under the environment based on a wind tunnel, and the method specifically comprises a driving fan for air suction, an auxiliary fan for air blowing, a driven fan for measuring relative voltage, a universal meter, a USB serial port, an ECU controller, a wire harness and a ventilating duct, and is characterized in that the efficiency of the driving fan is obtained by measuring the relative voltage value of the driven fan, the driving fan is externally connected with a power supply, the input voltage of the driving fan is controlled to be a certain value, when the driving fan is replaced, the rotating speed of the fan is controlled by the ECU so that the input current is the same amount, thus different driving fans are all in the same condition, the relative voltage measured at the driven fan has comparability and validity, the auxiliary fan for air blowing, the driven fan for measuring relative voltage and the driving fan for air suction are sequentially placed in the whole duct from left to right, the wind direction of wind is also from left to right; the auxiliary fan is used for blowing, the driving fan is used for sucking air, the driven fan is fixed at an air inlet of the wind tunnel, and the passing air flow drives the fan blades to rotate to output alternating-current voltage.
2. The method of claim 1, wherein the method of measuring the efficiency of the comparative fan comprises the following specific test steps: fixing a driven fan at an air inlet of a wind tunnel, driving fan blades to rotate by utilizing passing airflow to output alternating current voltage, and installing a driving fan needing to be compared at the other end of the driven fan;
step (2) connecting two measuring wires of the universal meter with any two of 3 wires output by the driven fan, wherein the gears are at alternating voltage, and the wire harness is connected; and (3) the ECU regulates the speed of the driving fan through the USB serial port, and tests the output voltage values of the driven fan at the rotating speeds of 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, 2800, 2900, 3000 and 3100 rpm.
3. A method of measuring comparative fan efficiency according to claim 1 wherein the fan is a fan used in a vehicle cooling system 385 or 305.
4. A method of measuring comparative fan efficiency according to claim 1 wherein said wind tunnel ambient length is 2000 mm.
5. The method of claim 1, wherein the power source is a regulated power supply or a switching power supply.
6. The method for measuring and comparing the efficiency of a fan according to claim 1 wherein the material of the periphery of the ventilation duct is sheet iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510845138.6A CN105716764B (en) | 2015-11-27 | 2015-11-27 | Method for measuring and comparing fan efficiency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510845138.6A CN105716764B (en) | 2015-11-27 | 2015-11-27 | Method for measuring and comparing fan efficiency |
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| Publication Number | Publication Date |
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| CN105716764A CN105716764A (en) | 2016-06-29 |
| CN105716764B true CN105716764B (en) | 2022-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510845138.6A Active CN105716764B (en) | 2015-11-27 | 2015-11-27 | Method for measuring and comparing fan efficiency |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108036917B (en) * | 2017-12-15 | 2019-09-06 | 中国航空工业集团公司金城南京机电液压工程研究中心 | A kind of ram-air turbine wind tunnel test test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100575909C (en) * | 2006-08-11 | 2009-12-30 | 比亚迪股份有限公司 | Blower performance test system and method for testing thereof |
| CN203441798U (en) * | 2013-07-24 | 2014-02-19 | 国家电网公司 | Fan efficiency on-line measuring device based on wireless communication |
| CN103541924B (en) * | 2013-10-24 | 2015-07-22 | 浙江理工大学 | Automatic test system of axial flow fans |
| CN203702616U (en) * | 2014-01-22 | 2014-07-09 | 苏州工业园区驿力机车科技有限公司 | Draught fan component and vehicle with the same |
| CN204679602U (en) * | 2015-05-20 | 2015-09-30 | 江苏建筑职业技术学院 | Based on the mine ventilator unit efficiency tester of TFT touch screen |
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Address after: No. 99 Weixin Road, Weiting Town, Suzhou Industrial Park, Jiangsu Province, 215000 Applicant after: SUZHOU YILI TECHNOLOGY Co.,Ltd. Address before: No. 99 Weixin Road, Weiting Town, Suzhou Industrial Park, Jiangsu Province, 215000 Applicant before: SUZHOU INDUSTRIAL PARK ELION TECHNOLOGY Co.,Ltd. Address after: No. 99 Weixin Road, Weiting Town, Suzhou Industrial Park, Jiangsu Province, 215000 Applicant after: SUZHOU INDUSTRIAL PARK ELION TECHNOLOGY Co.,Ltd. Address before: No. 99 Weixin Road, Weiting Town, Suzhou Industrial Park, Jiangsu Province, 215000 Applicant before: Firma Suzhou Industrial Park Elion Technology Co.,Ltd. |
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