CN103217549A - Thermistor type air velocity transducer with temperature compensation - Google Patents
Thermistor type air velocity transducer with temperature compensation Download PDFInfo
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- CN103217549A CN103217549A CN2013101079073A CN201310107907A CN103217549A CN 103217549 A CN103217549 A CN 103217549A CN 2013101079073 A CN2013101079073 A CN 2013101079073A CN 201310107907 A CN201310107907 A CN 201310107907A CN 103217549 A CN103217549 A CN 103217549A
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- thermistor
- temperature compensation
- air velocity
- velocity transducer
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Abstract
The invention relates to a thermistor type air velocity transducer with temperature compensation. The thermistor type air velocity transducer is used for air velocity measurement, is also used for flow velocity measurement of other gases and insulating fluids and belongs to the technical field of transducers. The thermistor type air velocity transducer with temperature compensation comprises a self-heating thermistor, a temperature-compensation thermistor, an insulating pillar, a metal tube and conducting wires. The thermistor type air velocity transducer with temperature compensation is not provided with a mechanical movement mechanism, causes little damage to a flow field, has small measurement inertia, can measure low air velocity, has high precision, a long service life, a high output signal, a simple back-end processing circuit, a reliable structure, a small size and a light weight; and the thermistor type air velocity transducer with temperature compensation is not only used for the air velocity measurement, but also used for the flow velocity measurement of other gases and insulating fluids.
Description
Technical field
The present invention relates to a kind of thermistor-type air velocity transducer with temperature compensation, this sensor is used for the measurement of wind speed, also can be used for the fluid-velocity survey of other gases and insulation body at night, belongs to sensor technical field.
Background technology
The measuring wind speed sensor that uses mainly contains two kinds of forms at present, and a kind of is vane air velocity transducer, the propeller air velocity transducer of band rotary part, and another kind is the hot line air velocity transducer.Vane air velocity transducer and propeller air velocity transducer are limited because of gyrating mass, and sensor inertia is bigger, and rotating part destroys the flow field, the lower wind speed of energy measurement not, and error is bigger, and serviceable life is limited.The hot line air velocity transducer only is about 0.02mm because of its hot line diameter and length only is about 2mm, to cause it to exist technology difficulty big, weak output signals, back end signal treatment circuit complexity, and the flimsy shortcoming of structure.
Summary of the invention
The objective of the invention is in order to propose a kind of thermistor-type air velocity transducer with temperature compensation, this sensor bulk is little, light weight, precision height, life-span are long, simple in structure, reliable, can be used for measuring wind speed, also can be used for the fluid-velocity survey of other gases and dielectric fluid.
The objective of the invention is to be achieved through the following technical solutions.
A kind of thermistor-type air velocity transducer of the present invention with temperature compensation, this sensor comprises self-heating thermistor, temperature compensation thermistor, heat insulation pillar, metal tube and lead;
The self-heating thermistor is metal thermistor or semiconductor thermistor, and high energy bears the heating current of 50mA; When the self-heating thermistor was MF51 N-type semiconductor N thermistor, its resistance of 0 ℃ was 1～5K Ω;
The temperature compensation thermistor is metal thermistor or semiconductor thermistor; The temperature compensation thermistor is a MF51 N-type semiconductor N thermistor, and its resistance of 0 ℃ is 10～40K Ω;
Heat insulation pillar is the low ambroin of thermal conductivity;
Glue is high-temperature plastic;
With glue self-heating thermistor and temperature compensation thermistor are fixed in the heat insulation pillar, the sensitive body of self-heating thermistor is exposed to outside the heat insulation pillar, the sensitive body of temperature compensation thermistor is exposed in the through hole of heat insulation pillar, with the lead-in wire of the lead-in wire of self-heating thermistor, temperature compensation thermistor respectively with wire bonds, metal tube is fixed on the heat insulation pillar, fills the welding portion of lead fixing with glue.
The present invention's advantage compared with prior art is:
(1) with respect to vane air velocity transducer, the propeller air velocity transducer of being with rotary part, the present invention can overcome the vane air velocity transducer and the propeller air velocity transducer is limited because of gyrating mass, sensor device inertia is bigger, rotating part destroys the flow field, the lower wind speed of energy measurement not, error is bigger, the shortcoming that serviceable life is limited.The present invention has little, the advantages such as measurement inertia is little, the low wind speed of energy measurement, precision height, long-life of destruction of no mechanical motion, stream field.
(2) with respect to hot line, heat pattern air velocity transducer, the present invention can overcome hot line, hot diaphragm type air velocity transducer technology difficulty is big, weak output signals, back end signal treatment circuit complexity, and the flimsy shortcoming of structure.The present invention has that technology is simple, output signal is big, the back-end processing circuit is simple, the advantage of reliable in structure.
(3) the present invention have simultaneously that volume is little, light weight, precision height, long-life, characteristics simple and reliable for structure.
(4) the present invention not only can be used for measuring wind speed, also can be used for the fluid-velocity survey of other gases and dielectric fluid.
Description of drawings
Fig. 1 is the structural representation of sensor of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Embodiment
A kind of thermistor-type air velocity transducer with temperature compensation, as shown in Figure 1, this sensor comprises self-heating thermistor 1, temperature compensation thermistor 2, heat insulation pillar 3, metal tube 4, glue 5, lead A6 and lead B8; Heat insulation pillar 3 have a through hole 7;
Self-heating thermistor 1 is a MF51 N-type semiconductor N thermistor, and its resistance of 0 ℃ is 2K Ω;
Temperature compensation thermistor 2 is a MF51 N-type semiconductor N thermistor, and its resistance of 0 ℃ is 25K Ω;
Heat insulation pillar 3 is a polyamides oxygen amine material, and its structural strength height can anti-400 ℃ of high temperature;
Glue 5 is the CH31 epoxy glue, and its bonding strength height can anti-220 ℃ of high temperature;
With glue 5 self-heating thermistor 1 and temperature compensation thermistor 2 are fixed in the heat insulation pillar 3, the sensitive body of self-heating thermistor 1 is exposed to outside the heat insulation pillar 3, the sensitive body of temperature compensation thermistor 2 is exposed in the through hole 7 of heat insulation pillar 3, lead-in wire and lead A6 welding with self-heating thermistor 1, lead-in wire and lead B8 welding with temperature compensation thermistor 2, metal tube 4 is fixed on the heat insulation pillar 3, fills the welding portion of lead fixing with glue.
Adopt heat dissipation measuring wind principle, when the self-heating thermistor was passed to electric current, the self-heating thermistor temp raise, and its temperature is higher than environment temperature, according to thermal balance equation:
I
2R-hA(T-T
F)=MCdT/dt （1）
In the formula: I is the heating current of self-heating thermistor;
R is the resistance of self-heating thermistor;
H is the surface film thermal conductance of self-heating thermistor;
A is the heat transfer sheet area of self-heating thermistor;
T is the temperature of self-heating thermistor;
T
FBe fluid temperature (F.T.);
M is the quality of self-heating thermistor;
C is a specific heat capacity;
T is the time;
For air velocity transducer reaches stable state, dT/dt=0, so formula (1) is:
I
2R-hA(T-T
F)=0 （2）
According to the test findings of Pa Jingen, the relation of heat transfer coefficient h and flow velocity:
K1, K2 are constant in the formula, and V is a fluid velocity.
With (3) formula substitution (2) Shi Kede:
P is a heat dissipation power in the formula.
Therefore, as △ T=T-T
FKeep when constant, can get:
P in the formula
0Power attenuation during for V=0, K is a calibration constants.
When fluid temperature variations, the temperature of self-heating thermistor 1 is changed accordingly, keep △ T=T-T
FConstant, otherwise △ T=T-T
FNon-constant, can cause formula (5) error to occur.The resistance and the temperature of temperature compensation thermistor 2 have funtcional relationship, when fluid temperature variations, by secondary instrument, regulate automatically and are carried in the electric current I of self-heating thermistor 1, thereby keep △ T=T-T
FConstant.Therefore, the electric current I and the wind speed V that are carried in self-heating thermistor 1 have the funtcional relationship of formula (5), by secondary instrument, can obtain rate of flow of fluid.
After tested, the range of present embodiment sensor is 0～30m/s, and degree of accuracy is better than 3%.
The above; only be the embodiment of the best of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
The content that is not described in detail in the instructions of the present invention belongs to this area professional and technical personnel's known technology.
Claims (6)
1. thermistor-type air velocity transducer with temperature compensation, it is characterized in that: this sensor comprises self-heating thermistor (1), temperature compensation thermistor (2), heat insulation pillar (3), metal tube (4) and lead; Heat insulation pillar (3) has through hole (7);
Self-heating thermistor (1) is metal thermistor or semiconductor thermistor;
Temperature compensation thermistor (2) is metal thermistor or semiconductor thermistor;
Heat insulation pillar (3) is the low ambroin of thermal conductivity;
With glue self-heating thermistor (1) and temperature compensation thermistor (2) are fixed in the heat insulation pillar (3), the sensitive body of self-heating thermistor (1) is exposed to outside the heat insulation pillar (3), the sensitive body of temperature compensation thermistor (2) is exposed in the through hole (7) of heat insulation pillar (3), with the lead-in wire of the lead-in wire of self-heating thermistor (1), temperature compensation thermistor (2) respectively with wire bonds, metal tube (4) is fixed on the heat insulation pillar (3), fills the welding portion of lead fixing with glue.
2. a kind of thermistor-type air velocity transducer with temperature compensation according to claim 1, it is characterized in that: used glue is high-temperature plastic.
3. a kind of thermistor-type air velocity transducer with temperature compensation according to claim 2 is characterized in that: glue is the CH31 epoxy glue of anti-220 ℃ of high temperature.
4. a kind of thermistor-type air velocity transducer with temperature compensation according to claim 1, it is characterized in that: self-heating thermistor (1) is a MF51 N-type semiconductor N thermistor, and its resistance of 0 ℃ is 1～5K Ω.
5. a kind of thermistor-type air velocity transducer with temperature compensation according to claim 1, it is characterized in that: temperature compensation thermistor (2) is a MF51 N-type semiconductor N thermistor, and its resistance of 0 ℃ is 10～40K Ω.
6. a kind of thermistor-type air velocity transducer with temperature compensation according to claim 1 is characterized in that: heat insulation pillar (3) is a polyamides oxygen amine material, can anti-400 ℃ of high temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101079073A CN103217549A (en) | 2013-03-29 | 2013-03-29 | Thermistor type air velocity transducer with temperature compensation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101079073A CN103217549A (en) | 2013-03-29 | 2013-03-29 | Thermistor type air velocity transducer with temperature compensation |
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| CN103217549A true CN103217549A (en) | 2013-07-24 |
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| CN2013101079073A Pending CN103217549A (en) | 2013-03-29 | 2013-03-29 | Thermistor type air velocity transducer with temperature compensation |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913594A (en) * | 2014-04-02 | 2014-07-09 | 太仓华风环保科技有限公司 | Face wind speed probe |
| CN104062459A (en) * | 2014-07-11 | 2014-09-24 | 湖南宇航科技有限公司 | Low-temperature freezing-resistant wind speed sensor |
| CN106290976A (en) * | 2016-09-29 | 2017-01-04 | 北京世纪建通科技股份有限公司 | Omnidirectional based on NTC thermistor air velocity transducer |
| CN107192471A (en) * | 2017-04-13 | 2017-09-22 | 南京史利姆电子科技有限公司 | A kind of New temperature compensation circuit and compensation method for pneumatic sensor |
| CN107741507A (en) * | 2017-12-12 | 2018-02-27 | 湖南普信工程技术有限公司 | A kind of NTC airspeedometers |
| CN108593956A (en) * | 2018-04-28 | 2018-09-28 | 中国空气动力研究与发展中心超高速空气动力研究所 | Micro- current meter of double mode and preparation method thereof |
| CN112577200A (en) * | 2019-09-30 | 2021-03-30 | 芜湖美的厨卫电器制造有限公司 | Wind speed measuring assembly, gas combustion equipment and control method of gas combustion equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4537068A (en) * | 1983-03-10 | 1985-08-27 | Dwyer Instruments, Inc. | Thermal anemometer |
| US5852236A (en) * | 1996-05-15 | 1998-12-22 | Honda Engineering Co., Ltd. | Fluid measuring probe |
| JP2000137037A (en) * | 1998-08-24 | 2000-05-16 | Kurabe Ind Co Ltd | Thermister air-speed detector |
-
2013
- 2013-03-29 CN CN2013101079073A patent/CN103217549A/en active Pending
Patent Citations (3)
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|---|---|---|---|---|
| US4537068A (en) * | 1983-03-10 | 1985-08-27 | Dwyer Instruments, Inc. | Thermal anemometer |
| US5852236A (en) * | 1996-05-15 | 1998-12-22 | Honda Engineering Co., Ltd. | Fluid measuring probe |
| JP2000137037A (en) * | 1998-08-24 | 2000-05-16 | Kurabe Ind Co Ltd | Thermister air-speed detector |
Non-Patent Citations (1)
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|---|
| 王英梅等: "SHF-1型数显风速计的研制", 《建筑科学》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913594A (en) * | 2014-04-02 | 2014-07-09 | 太仓华风环保科技有限公司 | Face wind speed probe |
| CN104062459A (en) * | 2014-07-11 | 2014-09-24 | 湖南宇航科技有限公司 | Low-temperature freezing-resistant wind speed sensor |
| CN106290976A (en) * | 2016-09-29 | 2017-01-04 | 北京世纪建通科技股份有限公司 | Omnidirectional based on NTC thermistor air velocity transducer |
| CN107192471A (en) * | 2017-04-13 | 2017-09-22 | 南京史利姆电子科技有限公司 | A kind of New temperature compensation circuit and compensation method for pneumatic sensor |
| CN107741507A (en) * | 2017-12-12 | 2018-02-27 | 湖南普信工程技术有限公司 | A kind of NTC airspeedometers |
| CN108593956A (en) * | 2018-04-28 | 2018-09-28 | 中国空气动力研究与发展中心超高速空气动力研究所 | Micro- current meter of double mode and preparation method thereof |
| CN108593956B (en) * | 2018-04-28 | 2023-06-02 | 中国空气动力研究与发展中心超高速空气动力研究所 | Dual-mode micro-flowmeter and preparation method thereof |
| CN112577200A (en) * | 2019-09-30 | 2021-03-30 | 芜湖美的厨卫电器制造有限公司 | Wind speed measuring assembly, gas combustion equipment and control method of gas combustion equipment |
| CN112577199A (en) * | 2019-09-30 | 2021-03-30 | 芜湖美的厨卫电器制造有限公司 | Water heating device |
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Application publication date: 20130724 |