CN110552908A - Fan performance measuring instrument based on thermodynamic principle - Google Patents
Fan performance measuring instrument based on thermodynamic principle Download PDFInfo
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- CN110552908A CN110552908A CN201810554323.3A CN201810554323A CN110552908A CN 110552908 A CN110552908 A CN 110552908A CN 201810554323 A CN201810554323 A CN 201810554323A CN 110552908 A CN110552908 A CN 110552908A
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- fan
- temperature
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- transmitter
- inlet
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a fan performance measuring instrument based on the thermodynamic principle, which comprises a temperature measuring device, a pressure transmitter, a gas analyzer, a motor control cabinet, an analog-to-digital converter, a data processor and a display, wherein a thermometer is arranged at an inlet and an outlet of a fan, and a pressure gauge is arranged at the inlet and the outlet of the fan and near the fan. The thermometer is connected with the temperature transmitter through wiring, the temperature transmitter, the pressure transmitter, the gas analyzer and the motor control cabinet are connected with the data processor through wiring, and the data processor is connected with the display through a data line.
Description
Technical Field
The invention relates to a fan flow and efficiency testing instrument.
Background
In the production process, the flow and the efficiency of the fan can be accurately determined, so that the production process is optimized, the production efficiency is improved, and the energy consumption of the fan is reduced.
The current commonly used fan flow measuring instrument is based on a velocity field method, that is, at a certain position of a fan air duct, a grid method is adopted to measure the gas dynamic pressure of each point on a grid of the section of the air duct, and then the volume flow of gas in the section is calculated by using the following formula:
wherein S is the area of the cross section measured in the air duct; ρ is the gas density; p is a radical ofdis the average dynamic pressure in the air duct.
According to the measured fan flow, the fan efficiency is generally calculated by the following formula:
V is the volume flow of the fan; delta p is the total pressure difference of the inlet and the outlet of the fan; w is the shaft power input to the fan.
By adopting the method, the flow field in the air duct of the fan is more uniform, and the method is more accurate. However, in order to reduce the floor space in the design of the production system, the structure is often compact, the air duct is bent more, and the straight pipe section is short, so that the selection of the test section cannot meet the requirement of accurate measurement, for example, the measurement section has a large speed difference, or a local vortex or backflow phenomenon, which brings a large error to the measurement of flow and efficiency, and the relative error even exceeds more than 10%. The inaccurate flow measurement brings great difficulty to the calculation of the efficiency of the fan.
disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a fan performance measuring instrument based on the thermodynamic principle.
The technical scheme adopted by the invention is as follows:
A fan performance measuring instrument based on the thermodynamic principle measures the gas components, the temperature of gas at the inlet and outlet of a fan, the ambient pressure and the inlet and outlet pressure of the fan, simultaneously measures the power input into the fan, and calculates the flow and efficiency of the fan by a method of solving the thermodynamic equation.
The invention has the advantages of clear principle, simple structure and higher precision.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings.
The reference numerals are explained below:
1. 5-temperature measuring device 2, 4, 9, 10, 11, 13, 14, 16, 18, 19, 20, 22-connection 3-temperature transmitter 6-blower outlet 7, 17, 25-pressure transmitter 8-gas analyzer 12-data processor and display 15-analog-to-digital converter 21-motor power meter 23-motor 24-blower 26-blower inlet
In the embodiment shown in the figure, the temperature measuring device 1 is mounted in the fan inlet 26, and the pressure transmitter 25 is mounted on the wall of the fan inlet 26. The temperature measuring device 5 is installed in the fan outlet 6, and the pressure transmitter 7 is installed on the wall surface of the fan outlet 6. The pressure transmitter 17 is mounted near the fan 24. A gas analyzer 8 is mounted at the fan outlet 6. The connections 2, 4 connect the temperature measuring devices 1, 5 with the temperature transmitter 3, which temperature transmitter 3 is connected with the analog-to-digital converter 15 via the connection 9. Connections 10, 11, 16, 18, 19 connect gas analyzer 8, pressure transmitter 7, pressure transmitter 17, pressure transmitter 25, motor power meter 21, respectively, with analog-to-digital converter 15. The motor 23 is powered by the connections 22, 20. The analog-to-digital converter 15 is connected to the data processing/display 12 via a connection 13. The temperature measuring devices 1 and 5 may be thermal resistors or thermocouples. The temperature measuring device 1 may also be installed in the vicinity of the fan 24 without being affected by the cold and heat sources if the fan inlet 26 is open to the ambient atmosphere. The data processor and display 12 may be a PLC and a display screen, or may be a combination machine or a computer.
the working principle of the embodiment is that the temperature measuring devices 1 and 5 are used for measuring the gas temperature at the fan inlet 26 and the fan outlet 6, and the temperature signal is input to the analog-to-digital converter 15 through the temperature transmitter 3; meanwhile, the pressure at the air outlet 26 and the fan outlet 6 is measured by the pressure transmitter 25 and the pressure transmitter 7, the ambient atmospheric pressure near the fan 24 is measured by the pressure transmitter 17, and the pressure signals are all input to the analog-to-digital converter 15; the gas components flowing through the fan are measured by a gas analyzer 8 and are also input to an analog-to-digital converter 15; finally, the power signal of the motor 23 is led out from the motor power meter 21 and input to the analog-to-digital converter 15. Thus, according to the parameter values input to the analog-to-digital converter 15, the analog-to-digital converter 15 can convert the parameter values into digital signals and transmit the digital signals to the data processing/display 12, the data processing/display 12 calculates the flow rate and efficiency of the fan 24 by using a thermodynamic method, and simultaneously, the flow rate and efficiency of the fan 24 can be output in real time through the connection 14.
The thermodynamic method is based on the principle of energy conservation, that is, after the heat dissipation on the surface of the fan and the height difference between the inlet and the outlet of the fan are neglected, the energy change of the gas flowing through the fan 24 is equal to the energy delivered to the fan 24 by the motor 23, that is:
In the formula: w is the input power of the motor 23 measured by the motor power meter 21; etadTo the efficiency of the motor 23; etamThe transmission efficiency between the motor 23 and the fan 24; m is the mass flow of gas flowing through the fan 24; h is1、h2The specific enthalpy of the gas at the fan inlet 26 and the outlet 6, respectively; v. of1、v2The average velocity of the gas at the fan inlet 26 and at the outlet 6 respectively.
wherein:
In the formula S1The cross-sectional area where the pressure measurement device 25 is installed for the fan inlet 26; s2the cross-sectional area of the fan outlet 6 where the pressure measuring device 7 is installed.
gas density ρ1、ρ2It can be found by table lookup or calculated using the following formula:
In the formula t1、t2the temperature of the gas at the fan inlet 26 and the fan outlet 6, respectively; p is a radical of1、p2Respectively being pressure measuring devices25. 7, measuring the gauge pressure at the fan inlet 26 and the fan outlet 6; p is a radical of0The ambient atmospheric pressure in the vicinity of the fan 24 measured by the atmospheric pressure measuring device 17; r is the gas constant in the pipeline and can be determined from the gas composition measured by the gas analyzer 8.
The specific enthalpy of gas can be found by a table look-up, or calculated by the following formula:
h2-h1＝cp(t2-t1) (8)
In the formula: c. CpThe specific heat capacity at constant pressure of the gas can be determined according to the gas components measured by the gas analyzer 8;
In the formula (3) in which the formulas (4) to (8) are substituted, the flow rate of the fan 24 can be calculated by solving a cubic equation about the flow rate. The efficiency of the fan 24 is then calculated using the following equation:
In the formulais the total pressure of the gas at the fan inlet 26 and the fan outlet 6;The stagnation temperature (total temperature) of the gas at the fan inlet 26 and the fan outlet 6; k is the gas specific heat ratio, wherein:
Similarly, after the k value is determined from the gas components measured by the gas analyzer 8, the fan efficiency is calculated by substituting equations (10) to (13) into equation (9).
The air temperature field and the static pressure field at the positions of the fan inlet 26 and the fan outlet 6 are relatively uniform, and particularly the temperature fields are very uniform, so that the novel air quantity and efficiency measuring instrument provided by the invention has higher time precision for measuring the fan 24 with higher pressure head.
the present invention is not limited to the above embodiments, and other various forms of products can be obtained by anyone in light of the present invention. However, any changes in shape or structure, which are the same or similar to the technical solutions of the present invention, are within the protection scope.
Claims (3)
1. A fan performance measuring instrument based on the thermodynamics principle is characterized by comprising a temperature measuring device, a temperature transmitter, a pressure transmitter, a gas analyzer, a motor power meter, an analog-to-digital converter, a data processor and a display, wherein the temperature measuring device and the pressure transmitter are installed at an inlet and an outlet of a fan, an atmospheric pressure transmitter is installed near the fan, the motor is connected with the motor power meter through wiring, the gas analyzer is installed at the outlet of the fan, the temperature measuring device is connected with the temperature transmitter through wiring, the temperature transmitter, the pressure transmitter, the gas analyzer and the motor power meter are connected with the analog-to-digital converter through wiring, and the analog-to-digital converter is connected with the data processor and the display through wiring.
2. The thermodynamic principles-based fan flow and efficiency measurement instrument according to claim 1, wherein a gas analyzer is installed in the duct near the fan inlet.
3. The thermodynamic-principle-based fan flow and efficiency measurement instrument of claim 1, wherein the data processor uses a thermodynamic method to solve for fan flow and efficiency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810554323.3A CN110552908A (en) | 2018-06-01 | 2018-06-01 | Fan performance measuring instrument based on thermodynamic principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810554323.3A CN110552908A (en) | 2018-06-01 | 2018-06-01 | Fan performance measuring instrument based on thermodynamic principle |
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| Publication Number | Publication Date |
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| CN110552908A true CN110552908A (en) | 2019-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810554323.3A Pending CN110552908A (en) | 2018-06-01 | 2018-06-01 | Fan performance measuring instrument based on thermodynamic principle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115199578A (en) * | 2021-04-09 | 2022-10-18 | 李建锋 | Fan flow and efficiency testing method based on gas temperature rise |
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| US20090150121A1 (en) * | 2006-04-18 | 2009-06-11 | Mitsubishi Heavy Industries, Ltd. | Performance monitoring apparatus and system for fluid machinery |
| CN202628482U (en) * | 2011-12-08 | 2012-12-26 | 大连海事大学 | Automatic blower fan performance testing system |
| CN106153128A (en) * | 2016-03-24 | 2016-11-23 | 李建锋 | Compressor flow based on gas temperature rise and efficiency measurement instrument |
| CN106840282A (en) * | 2015-12-03 | 2017-06-13 | 李建锋 | Compressor flow and Efficiency test method based on gas temperature rise |
| CN107167257A (en) * | 2017-05-26 | 2017-09-15 | 北京航空航天大学 | A kind of device for measuring high temperature and high pressure gas stagnation temperature |
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2018
- 2018-06-01 CN CN201810554323.3A patent/CN110552908A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090150121A1 (en) * | 2006-04-18 | 2009-06-11 | Mitsubishi Heavy Industries, Ltd. | Performance monitoring apparatus and system for fluid machinery |
| CN202628482U (en) * | 2011-12-08 | 2012-12-26 | 大连海事大学 | Automatic blower fan performance testing system |
| CN106840282A (en) * | 2015-12-03 | 2017-06-13 | 李建锋 | Compressor flow and Efficiency test method based on gas temperature rise |
| CN106153128A (en) * | 2016-03-24 | 2016-11-23 | 李建锋 | Compressor flow based on gas temperature rise and efficiency measurement instrument |
| CN107167257A (en) * | 2017-05-26 | 2017-09-15 | 北京航空航天大学 | A kind of device for measuring high temperature and high pressure gas stagnation temperature |
Non-Patent Citations (1)
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| 李斌 等: "电站送风机性能的快捷测试方法", 《流体机械》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115199578A (en) * | 2021-04-09 | 2022-10-18 | 李建锋 | Fan flow and efficiency testing method based on gas temperature rise |
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Application publication date: 20191210 |
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