CN2296006Y - Sensor for measuring heat exchanging ability - Google Patents
Sensor for measuring heat exchanging ability Download PDFInfo
- Publication number
- CN2296006Y CN2296006Y CN 97215476 CN97215476U CN2296006Y CN 2296006 Y CN2296006 Y CN 2296006Y CN 97215476 CN97215476 CN 97215476 CN 97215476 U CN97215476 U CN 97215476U CN 2296006 Y CN2296006 Y CN 2296006Y
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- CN
- China
- Prior art keywords
- heater
- sensor
- measuring
- heating element
- heat exchanging
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- Expired - Fee Related
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The utility model belongs to the measuring technique of the heat exchanging ability, particularly a sensor for measuring the heat exchanging ability, which is mainly composed of a heating element which is manufactured by materials which have the resistance temperature coefficient of greater than 5*10<-4 >/DEG C, conducting wires which can provide a working power supply to the heating element, and voltage leading wires which are connected to both ends of the heating element and can measure the heating element. Through testing the passing current and the electric voltage on both ends of the heating element, the temperature T, the electric power P, the heat flux q, and the heat exchange coefficient alpha of the heating element can be obtained. The sensor for measuring the heat exchanging ability of the utility model has the characteristics of rapid measurement, convenient and accurate property, and high sensitivity, and the usage of the sensor for measuring the heat exchanging ability can simultaneously realize the control to the cooling ability of the medium.
Description
The utility model belongs to the heat-exchange capacity measuring technique, mainly proposes a kind of sensor that is used to measure heat-exchange capacity, and this sensor is particularly useful for the measurement of hardening media heat-exchange capacity.
In existing object heat-exchange capacity measuring technique, heat wire method and thin slice sensor method are arranged with immediate sensor of the utility model and measuring method.Heat wire method is the resistance wire that utilizes in the measured medium that is immersed in the certain volume, lowest high-current value during the fusing of measuring resistance silk is measured heat-exchange capacity (cooling power of medium), during measurement, adopt the nickel-chromium resistance wire of certain-length, be immersed in the measured medium and pass to electric current, progressively increase current value, till resistance wire fusing, electric current during with fusing is noted, and represents heat-exchange capacity (cooling power) with the square value of electric current.This method equipment needed thereby is simple, but when operation influence factor more, must strict control test condition.The thin slice sensor is sweating heat galvanic couple and a pressure measurement electrode formation on nichrome alloy belt, the all whole casting of alloy band, thermopair and electrode is in ceramic body, make the alloy band pass to electric current during work, measure the temperature of band active section, voltage drop and the electric current by alloy band (well heater) go out thermoflux and heat exchange coefficient according to the gained data computation.This method is owing to welded a thermopair on the alloy band, this just makes the heating condition of pad and radiating condition be different from other position on the alloy band, thereby the temperature of alloy band on the temperature that records, and also has the thermal loss problem in addition.
The purpose of this utility model promptly provides a kind of sensor that high temp objects and surrounding medium heat-exchange capacity are used of measuring, and makes it have convenient, rapid, accurate, the highly sensitive characteristics of measuring.
Its technical characterictic of the sensor that the utility model proposes is: mainly by a temperature-coefficient of electrical resistance greater than 5 * 10
-4/ ℃ simple metal and the heater made of alloy material thereof, be connected the heater two ends in order to the lead of working power to be provided to it, be connected the heater two ends and constitute in order to lead-in wire of measuring the heater both end voltage by it.
Heater has uniform uniform cross section in the longitudinal direction.
The two ends electric power conductor provides constant voltage to heater.
Electric power conductor provides adjustable output voltage to heater when constant temperature measurement.
The lead-in wire of measuring the heater both end voltage also can be connected on the lead in working power loop.
The principle of work of sensor: when adding constant voltage (direct current or exchange all can) at electric power conductor 2 two ends, electric current flows through heater through electric power conductor, heater converts electric energy to heat energy, its temperature is raise, in medium, dispel the heat simultaneously, when the heating power of heater and the power that dispels the heat in medium equate, promptly reached balance, at this moment the temperature T of heater, the voltage drop U at heater two ends and its electric current I of process are steady state value, measure U and I, calculate according to U and I: power P=IU, thermoflux q=P/S, temperature T is by equation: U/I=R
0(1+ α
1T+ α
2T
2) solve.
The utility model sensor in use energized equates with heat radiation power that to the heating power of heater the needed time is less than 1 second, in with a kind of medium, take multiple measurements data error all less than 1%, have and measure rapid, convenient, accurate, highly sensitive characteristics, use this sensor can realize the medium cooling power is controlled simultaneously.
Embodiment:
Accompanying drawing 1 is the utility model structural representation.
Accompanying drawing 2 synoptic diagram when measuring.
As shown in drawings: the lead-in wire 3 that sensor is fallen by heater 1, the electric power conductor 2 that is connected heater 1 two ends and measurement heater 1 both end voltage constitutes, heater 1 is selected the material with big temperature-coefficient of electrical resistance for use, make as industrial simple metal such as iron, copper, molybdenum, tungsten, tantalum, lithium and alloy material thereof, has uniform cross-sectional area in the longitudinal direction, thread as the circular section, the sheets of square-section etc., lead-in wire 3 can be connected on the end points of heater, also can be connected on the lead 2.The contact of lead 2 and heater and go between 3 with the contact of lead 2, or go between and 3 be added with a layer insulating with the outside surface of the contact of heater and (when the medium electric conductivity is very poor, can not want insulation course, when medium has certain electric conductivity, add insulation course and can reduce electric current, reduce measuring error) by medium.The last layer overlayer different with the material of heater can be coated or deposit to the part of heater 1 or all surfaces, can simulate the heat-exchange capacity of different surfaces and medium thus.
Autotransformer 5 provides 220V AC power during use, in the electric power loop of heater, insert reometer 7 and record electric current, between the lead-in wire of heater two ends, insert voltage table 6 and record the heater both end voltage, and draw the electric power of heater by P (electric power)=IU; Draw the thermoflux of heater by q (thermoflux)=P/S, wherein S is the interfacial area between heater and the medium.The temperature T of heater is by equation: U/I=R
0(1+ α
1T+ α
2T
2) solve; R wherein
0Resistance during for T=0, α
1α
2Be the constant relevant with heating material character; α as a rule
2=0, T=(U/I R at this moment
0-1)/α
1
The heat exchange coefficient α of heater is drawn by α=q/ (T-Tm), and wherein Tm is the medial temperature of medium.
Claims (3)
1, a kind of sensor that is used to measure heat-exchange capacity, feature of the present utility model is: mainly by a temperature-coefficient of electrical resistance greater than 5 * 10
-4/ ℃ simple metal and the heater (1) made of alloy material thereof, be connected heater (1) two ends in order to the lead (2) of working power to be provided to it, be connected heater (1) two ends and constitute in order to lead-in wire (3) of measuring the heater both end voltage by it.
2, the sensor that is used to measure heat-exchange capacity according to claim 1 is characterized in that heater (1) has uniform uniform cross section in the longitudinal direction.
3, the sensor that is used to measure heat-exchange capacity according to claim 1 is characterized in that the lead-in wire (3) of measuring heater (1) both end voltage can be connected on the lead (2) in heater working power loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97215476 CN2296006Y (en) | 1997-05-01 | 1997-05-01 | Sensor for measuring heat exchanging ability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97215476 CN2296006Y (en) | 1997-05-01 | 1997-05-01 | Sensor for measuring heat exchanging ability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2296006Y true CN2296006Y (en) | 1998-10-28 |
Family
ID=33932620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97215476 Expired - Fee Related CN2296006Y (en) | 1997-05-01 | 1997-05-01 | Sensor for measuring heat exchanging ability |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2296006Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7574900B2 (en) | 2005-07-08 | 2009-08-18 | Ngk Spark Plug Co., Ltd. | Liquid state detection sensor |
-
1997
- 1997-05-01 CN CN 97215476 patent/CN2296006Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7574900B2 (en) | 2005-07-08 | 2009-08-18 | Ngk Spark Plug Co., Ltd. | Liquid state detection sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |