CN2606884Y - Analogue content linear temperature sensing detector capable of carrying out temperature real-time monitor - Google Patents
Analogue content linear temperature sensing detector capable of carrying out temperature real-time monitor Download PDFInfo
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- CN2606884Y CN2606884Y CN 03242354 CN03242354U CN2606884Y CN 2606884 Y CN2606884 Y CN 2606884Y CN 03242354 CN03242354 CN 03242354 CN 03242354 U CN03242354 U CN 03242354U CN 2606884 Y CN2606884 Y CN 2606884Y
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Abstract
The utility model relates to an analogue content linear temperature sensing detector capable of carrying out temperature real-time monitor. The main points lie in that the utility model comprises a monitoring terminal, a temperature sensing cable and a terminal box, and the monitoring terminal comprises a microprocessor, an impulse output circuit, a signal comparison and transformation circuit, a timer circuit, and a display and operation circuit. The utility model is capable of dynamically measuring the RC product value of resistance and capacitance between the two temperature sensing cable conductors, and of calculating the maximal temperature in the range along the temperature sensing cable according to the relation of the RC value and the real temperature, thereby realizing the functions of carrying out temperature real-time monitor, of at will setting the alarming temperature free from the heating length, and of detecting temperature difference,etc.
Description
Technical field
The utility model relates to a kind of temperature real time monitoring analog linear temperature-sensing detector that carries out, and this heat detector can measure resistance, the electric capacity product value of temperature sensing cable, and calculates the temperature of temperature sensing cable peak along the line, realizes the real time monitoring of temperature.
Background technology
Line-type heat detector is a kind of sensor that is used for the long distance in security against fire field, temperature anomaly supervision on a large scale.Domestic product mainly is a switching value formula line-type heat detector before 2000, and there are problems such as not reproducible use, alarm temperature are fixed, easily are mechanically damaged, rate of false alarm height in the heat detector of prior art.Given this, the applicant has developed the reusable line-type heat detector of nalog quantity type in 2000, this detector can solve the problem of switching value formula line-type heat detector preferably, but also have following problem: 1. alarm temperature is to set by 1 meter temperature sensing cable temperature-raising characteristic, and the process of warning has substantial connection with the length of being heated; 2. can not provide real-time temperature value; 3. can't realize the different constant temperature detection, to improve the usable range of detector.Therefore, need to propose a kind of temperature real time monitoring analog linear temperature-sensing detector that carries out.
Summary of the invention
The purpose of this utility model is to provide a kind of temperature real time monitoring analog linear temperature-sensing detector that carries out, resistance, the electric capacity product RC value of this heat detector between can kinetic measurement temperature sensing cable two conductors extrapolated the highest temperature in the temperature sensing cable scope along the line according to the relation between RC and actual temperature.Real time monitoring, the alarm temperature of realizing temperature set arbitrarily and with the functions such as length is irrelevant, different constant temperature detection of being heated.
The purpose of this utility model is realized by following technical proposals: a kind of temperature real time monitoring analog linear temperature-sensing detector that carries out, and its main points are: be made up of monitoring terminal, temperature sensing cable and termination box; Relatively form by shaping circuit, timer circuit, demonstration and function circuit by microprocessor, impulse output circuit, signal for described monitoring terminal.
Principle of the present utility model is: the length relation of being inversely proportional to of the equivalent resistance R of temperature sensing cable and temperature sensing cable, and the length of the equivalent capacitance value C of temperature sensing cable and temperature sensing cable is proportional, so the product RC of resistance, electric capacity and temperature sensing cable length are irrelevant.The RC value is relevant with the heating temperature of temperature sensing cable in addition.The resistance value that is located at temperature sensing cable unit length under the temperature T is r
T, capacitance is c
T, then can extrapolate t according to the equivalent circuit theory of temperature sensing cable
0=R.C=kr
TC
T, wherein k be level off to 1 one adjust parameter, can determine according to the test actual measurement.The utility model measures the product RC of resistance capacitance by monitoring terminal, and then can calculate the maximum temperature value in the temperature sensing cable scope along the line.According to described principle, the utility model mainly adopts measures temperature sensing cable time constant t
0The method of=R.C designs monitoring terminal.
The utility model compared with prior art has the following advantages:
1, because the utility model can detect the higher temperature value of precision, so the setting of alarm threshold value can import arbitrarily by showing with function circuit, and the setting of alarm temperature is irrelevant with the length of being heated.
2, the real time temperature value of the utility model by obtaining can be set up the different constant temperature mathematical model of fire alarm, realizes the detection of different constant temperature.
3, the utility model can be widely used in the long distance in industry, the abominable place of environment, national defence field, temperature anomaly monitors and surveys or the real time temperature monitoring on a large scale, can realize constant temperature or different constant temperature detection alarm.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1, theory diagram of the present utility model
Fig. 2, parallel conductor formula temperature sensing cable structural representation of the present utility model
Fig. 3, another structural representation of parallel conductor formula temperature sensing cable of the present utility model
Fig. 4, coaxial cable type temperature sensing cable structural representation of the present utility model
The equivalent circuit diagram of Fig. 5, temperature sensing cable of the present utility model
Temperature-the frequency characteristic figure of Fig. 6, temperature sensing cable of the present utility model
A kind of measuring method synoptic diagram of Fig. 7, time constant of the present utility model
The theory diagram of Fig. 8, a specific embodiment of the present utility model
Embodiment
Referring to Fig. 1 and Fig. 2, heat detector of the present utility model is made up of monitoring terminal 6, temperature sensing cable 7 and termination box 8; Relatively form by shaping circuit 4, timer circuit 5, demonstration and function circuit 1 by microprocessor 2, impulse output circuit 3, signal for described monitoring terminal.In an embodiment of the present utility model, described temperature sensing cable is a parallel conductor formula temperature sensing cable, is provided with negative temperature coefficient thermistor composition 702 between the described parallel conductor 701, and this temperature sensing cable is provided with two strip conductors, and the distance between the conductor is bigger.Wherein, negative temperature coefficient thermistor composition plays the insulation course effect, along with variation of temperature, the equivalent resistance and the electric capacity of temperature sensing cable also change, and equivalent resistance R is inversely proportional to the length of being heated, and equivalent capacity C is directly proportional with the length of being heated, so the time constant RC of temperature sensing cable and length have nothing to do.In the utility model, the negative temperature coefficient thermistor composition that is adopted has recoverable characteristic after the temperature anomaly, establishes terminal resistance in the described termination box, and this termination box is used for the fault monitoring of temperature sensing cable.
Referring to Fig. 3, in an embodiment of the present utility model, described temperature sensing cable is a parallel conductor formula temperature sensing cable, is provided with negative temperature coefficient thermistor composition 702 between the described parallel conductor 701, and this temperature sensing cable also is provided with high temperature resistant, corrosion resistant oversheath 71.This temperature sensing cable is provided with two strip conductors, and the distance between the conductor is less.
Referring to Fig. 4, in an embodiment of the present utility model, described temperature sensing cable is the coaxial cable type temperature sensing cable, and this cable sets gradually metallic conductor 701, negative temperature coefficient thermistor composition insulation course 702, wire sheathing 703, high temperature resistant, corrosion-resistant oversheath 72 from inside to outside.
Referring to Fig. 5, shown the equivalent electrical circuit of temperature sensing cable of the present utility model.If the temperature sensing cable total length is L, the resistance of unit length is r under the environment temperature
n, capacitance is c
nAccording to equivalent electrical circuit, the resistance of establishing temperature sensing cable unit length under the temperature T is r
T, capacitance is c
T, and the length of being heated is L, then can extrapolate t according to the equivalent circuit theory of temperature sensing cable
0=RC=r
TC
T{ [l+ (L-l) c
n/ c
TL+]/[(L-l) r
T/ r
n], can be reduced to t
0=kr
TC
T, wherein k be level off to 1 one adjust parameter, can determine according to the test actual measurement.
Referring to Fig. 6, shown the temperature-frequency characteristic of temperature sensing cable of the present utility model.Get f=l/t
0, can draw temperature one frequency characteristic of temperature sensing cable by experimental test, and each frequency values is corresponding some temperature.Only need measure time constant t thus
0Or frequency f can be extrapolated temperature sensing cable maximum temperature along the line.
Referring to Fig. 7, shown the measuring principle of a kind of time constant of the present utility model, promptly to temperature sensing cable input pulse signal, measure the temperature sensing cable dynamic process and reach steady state voltage V
0About 90% (V
1) time required time, be t
0
Referring to Fig. 8, an embodiment of the present utility model.Microprocessor 11 (its model is 8XC552) is mainly finished control wave output, (its model is 8XC552T to read timer circuit
1, T
2) functions such as numerical value, the calculating of carrying out temperature, control output demonstration.Impulse output circuit (its model is CD4051) 12 will promptly can be used for the time constant determination method according to the order output characteristic frequency or the width pulse of microprocessor 11, also can be used for direct frequency measurement rate method.Speed buffering amplifier 13,14 allows high-frequency signal output, can play a protective role to internal circuit.The reference voltage of high-speed comparator 15,16 has 19 outputs of D/A (D/A) converter, and it is by the characteristic decision of different temperature sensing cables.Logic gate 18 outputs start and stop the signal of timer circuit 20, and when impulse output circuit 12 started, timer circuit 20 zero clearings also picked up counting, when the temperature sensing cable dynamic process reaches steady state voltage V
0About 90% (V
1) time, stopping timing, the sprocket pulse of timer circuit 20 is provided by pulse generating circuit 17.Microprocessor 11 takes out umber of pulse and calculates time constant t from timer circuit
0Or frequency f, finally draw temperature value T
0Necessary demonstration is carried out in microprocessor 11 and then control output relay, display lamp and LCD MODULE 21 actions.When the temperature sensing cable short trouble, time constant t
0Approximate 0; When the temperature sensing cable open circuit fault, the lower bound f of the measured frequency f of institute during less than operate as normal
nMicroprocessor 11 can be judged the malfunction of temperature sensing cable thus.
What the utility model obtained is the higher temperature value of precision, so the setting of alarm threshold value can be imported arbitrarily by operation display interface.Real time temperature value by obtaining in addition can be set up the different constant temperature mathematical model of fire alarm, realizes the detection of different constant temperature.
The utility model can be widely used in the long distance in industry, the abominable place of environment, national defence field, temperature anomaly monitors and surveys or the real time temperature monitoring on a large scale, can realize constant temperature or different constant temperature detection alarm.
Claims (4)
1, a kind of temperature real time monitoring analog linear temperature-sensing detector that carries out is characterized in that: be made up of monitoring terminal, temperature sensing cable and termination box; Relatively form by shaping circuit, timer circuit, demonstration and function circuit by microprocessor, impulse output circuit, signal for described monitoring terminal.
2, the temperature real time monitoring analog linear temperature-sensing detector that carries out according to claim 1, it is characterized in that: described temperature sensing cable is a parallel conductor formula temperature sensing cable, is provided with negative temperature coefficient thermistor composition between the described parallel conductor.
3, the temperature real time monitoring analog linear temperature-sensing detector that carries out according to claim 2, it is characterized in that: described temperature sensing cable is provided with high temperature resistant, corrosion resistant oversheath.
4, the temperature real time monitoring analog linear temperature-sensing detector that carries out according to claim 1, it is characterized in that: described temperature sensing cable is the coaxial cable type temperature sensing cable, and this cable sets gradually metallic conductor, negative temperature coefficient thermistor composition insulation course, wire sheathing, high temperature resistant, corrosion-resistant oversheath from inside to outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03242354 CN2606884Y (en) | 2003-03-25 | 2003-03-25 | Analogue content linear temperature sensing detector capable of carrying out temperature real-time monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03242354 CN2606884Y (en) | 2003-03-25 | 2003-03-25 | Analogue content linear temperature sensing detector capable of carrying out temperature real-time monitor |
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| Publication Number | Publication Date |
|---|---|
| CN2606884Y true CN2606884Y (en) | 2004-03-17 |
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ID=34168696
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03242354 Expired - Fee Related CN2606884Y (en) | 2003-03-25 | 2003-03-25 | Analogue content linear temperature sensing detector capable of carrying out temperature real-time monitor |
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| Country | Link |
|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100429679C (en) * | 2005-12-19 | 2008-10-29 | 首安工业消防有限公司 | Data fusing warning method using one line type temperature sensing element |
| CN100442319C (en) * | 2005-12-19 | 2008-12-10 | 首安工业消防有限公司 | Composite line type temperature sensing fire detector and its data fusing warning method |
| CN100454347C (en) * | 2005-12-31 | 2009-01-21 | 首安工业消防有限公司 | Data fusion alarm system and method for linear fire detector |
| CN101520936B (en) * | 2008-02-15 | 2013-04-24 | 西门子公司 | Robust evaluation of a temperature measurement signal by using a dynamic adaptation of a computational model |
-
2003
- 2003-03-25 CN CN 03242354 patent/CN2606884Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100429679C (en) * | 2005-12-19 | 2008-10-29 | 首安工业消防有限公司 | Data fusing warning method using one line type temperature sensing element |
| CN100442319C (en) * | 2005-12-19 | 2008-12-10 | 首安工业消防有限公司 | Composite line type temperature sensing fire detector and its data fusing warning method |
| CN100454347C (en) * | 2005-12-31 | 2009-01-21 | 首安工业消防有限公司 | Data fusion alarm system and method for linear fire detector |
| CN101520936B (en) * | 2008-02-15 | 2013-04-24 | 西门子公司 | Robust evaluation of a temperature measurement signal by using a dynamic adaptation of a computational model |
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| Date | Code | Title | Description |
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| 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 |