CN201964976U - High-accuracy temperature-measuring module for heat meter - Google Patents

High-accuracy temperature-measuring module for heat meter Download PDF

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Publication number
CN201964976U
CN201964976U CN2011200632605U CN201120063260U CN201964976U CN 201964976 U CN201964976 U CN 201964976U CN 2011200632605 U CN2011200632605 U CN 2011200632605U CN 201120063260 U CN201120063260 U CN 201120063260U CN 201964976 U CN201964976 U CN 201964976U
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temperature
links
control module
calorimeter
module
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CN2011200632605U
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祝向辉
陈秋煌
贾灵
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Lierda Science & Technology Group Co., Ltd.
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LIERDA SCIENCE AND TECHNOLOGY Co Ltd
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Abstract

The utility model relates to a high-accuracy temperature-measuring module for a heat meter and aims at providing a temperature-measuring module which has high detection accuracy and low cost and is applied to the heat meter. The high-accuracy temperature-measuring module for the heat meter comprises a temperature-measuring circuit, a control unit and a timing unit. The temperature-measuring circuit is connected to the control unit, and the control unit is connected to the timing unit. The temperature-measuring circuit includes a resistor 1, a capacitor 2, a constant current source 3, a temperature sensor 4 and a comparator 5. One end of the resistor 1 is connected to the control unit, the other end of the resistor 1 is respectively connected to one end of the capacitor 2 and a positive input end of the comparator 5, and the other end of the capacitor 2 is connected to the earth. After the constant current source 3 is connected in parallel with the temperature sensor 4, one end of the constant flow source 3 is connected to the earth, the other end of the constant flow source 3 is connected to a negative input end of the comparator 5, and the output end of the comparator 5 is connected to the control module. The high-accuracy temperature-measuring module for the heat meter omits a small signal amplification circuit, thereby reducing cost and realizing the temperature-measuring technology which has high accuracy and low cost and is applied to the heat meter.

Description

A kind of high precision measuring temperature module that is applied to calorimeter
Technical field
The utility model relates to the calorimeter electronic manufacturing field, and in particular, the utility model is about reducing a kind of high precision measuring temperature module that is applied to calorimeter of calorimeter electricity manufacturing cost.
Background technology
Calorimeter is a kind ofly to be used to measure and to show that current discharge or absorb the instrument of thermal energy through heat-exchange system, are widely used in the heat metering of northern China.In calorimeter when work,, the supply and return water temperature signal that flow that provides according to flow sensor and temperature sensor provide, and the time of current warp calculate and show the thermal energy that this system discharges or absorbs by counter.
Calorimeter can be divided into two big modules by its major function: temperature measurement module and flow measurement module.When having only the equal error in dipping of these two modules all to meet the demands, the thermal energy accuracy of measuring of calorimeter just can be guaranteed, and therefore, high-precision thermometric seems most important in the application of calorimeter.
Include temperature sensor and counter in the temperature measurement module, usually adopt platinum sensor in the calorimeter as temperature sensor, the resistance value of platinum sensor changes along with variation of temperature, and the two is generally linear, if can obtain the resistance value of platinum sensor, then can be by the current temperature value of the anti-release of counter.
Calorimeter in the market adopts numeric type temperature measurement module cost height, is unfavorable for using in the product for civilian use, therefore needs a kind of low temperature measurement module of accuracy of detection height, cost that is applicable to civil heat meter.
Patent Office of the People's Republic of China has announced a CN2413269Y document January 3 calendar year 2001, name is called calorimeter, this calorimeter is made up of water meter, temperature probe, signal processing circuit, display, is characterized in, is built-in with digital temperature probe in water inlet and water return pipeline; Display and test section partial installation; In display, keep two magnetic induction buttons.Since adopted digital temperature probe, therefore, good stability, temperature-measuring range is wide, the precision height; Display and test section partial installation and be loaded on outdoor, and built-in magnetic induction button, the small magnet that it and meter reading personnel hold matches, making needs information to access at any time, is convenient to check meter and checks whether robber's thermal phenomenon is arranged.This calorimeter adopts digital temperature probe, and cost is higher, is unfavorable for that the product for civilian use uses.
Summary of the invention
The utility model is for solving the shortcoming that the temperature measurement module cost that exists in the prior art and accuracy of detection can not be taken into account, and a kind of have accuracy of detection height, the high precision measuring temperature module that is applied to calorimeter that cost is low are provided.
The technical scheme that its technical matters that solves the utility model adopts is: the utility model comprises temperature measurement circuit, control module and timing unit, and temperature measurement circuit links to each other with control module, and control module links to each other with timing unit; Temperature measurement circuit comprises resistance 1, electric capacity 2, constant current source 3, temperature sensor 4, comparer 5, one end of resistance 1 links to each other with control module, the other end of resistance 1 links to each other with an end of electric capacity 2, the positive input terminal of comparer 5 respectively, the other end of electric capacity 2 links to each other with ground, after constant current source 3 and temperature sensor 4 are in parallel, one end links to each other with ground, and the other end links to each other with the negative input end of comparer 5, and the output terminal of comparer 5 links to each other with control module.When comparer 5 output low levels, control module controlling resistance 1 is to electric capacity 2 chargings, when comparer 5 output high level, 2 discharges of 1 pair of electric capacity of control module controlling resistance in the timing T of timer, are write down the T.T. T1 of resistance 1 to electric capacity 2 chargings by timer, because temperature sensor 4 both end voltage Vref are directly proportional with duration of charging T1, therefore can get the magnitude of voltage of Vref, can calculate the resistance value of temperature sensor 4 according to Ohm law, thereby can extrapolate temperature value.
As preferably, temperature sensor 4 is platinum sensors.Platinum sensor has the advantage of accuracy of detection height, good stability.
As preferably, resistance 1 is that low temperature floats precision resister.Low temperature floats the stability that precision resister can guarantee thermometric.
As preferably, control module comprises controller 6, and controller 6 is microprocessors.Microprocessor has the advantage that cost is low, function is complete.
As preferably, timing unit comprises timer 8, timer 7, and timer 8, timer 7 link to each other with control module respectively.Can adopt ready-made timer and timer, thus simplified design.
The beneficial effects of the utility model are: compared with prior art, the utility model has saved small signal amplification circuit, thereby has reduced cost, has realized a kind of high precision of calorimeter, thermometry cheaply of being applied to; Because controller, timer and timer can be integrated in the single-chip microcomputer usually, therefore, this temperature measurement module circuit is simple, cost is low, and the temperature measurement accuracy height.
Description of drawings
Fig. 1 is a kind of structural representation that the utility model is applied to the high precision measuring temperature module of calorimeter.
Among the figure: 1. resistance, 2. electric capacity, 3 constant current sources, 4 temperature sensors, 5 comparers, 6 controllers, 7 timers, 8 timers.
Embodiment
Below by specific embodiment, and in conjunction with the accompanying drawings the technical solution of the utility model is described in further detail.
Embodiment:
A kind of high precision measuring temperature module that is applied to calorimeter of present embodiment, referring to Fig. 1, comprise temperature measurement circuit, control module, timing unit, temperature measurement circuit links to each other with control module, control module links to each other with timing unit, temperature measurement circuit comprises resistance 1, electric capacity 2, constant current source 3, temperature sensor 4, comparer 5, one end of resistance 1 links to each other with control module, the other end of resistance 1 respectively with an end of electric capacity 2, the positive input terminal of comparer 5 links to each other, the other end of electric capacity 2 links to each other with ground, and after constant current source 3 and temperature sensor 4 were in parallel, an end linked to each other with ground, the other end links to each other with the negative input end of comparer 5, and the output terminal of comparer 5 links to each other with control module.Control module comprises controller 6, and controller 6 adopts microprocessor.
When initial, the P1 of controller 6 end output low level, the output end vo ut of comparer 5 is a low level, the temperature detection step is as follows:
1, the P1 of controller 6 end output high level, this moment, electric current was flowed through resistance 1 to electric capacity 2 chargings, as voltage Vin during greater than Vref, Vout is a high level, this moment opening timing device 8 and timing T.
2, the P1 of controller 6 end output low level, this moment, electric capacity 2 was in discharge condition, and as voltage Vin during less than Vref, Vout is a low level.
3, the P1 of controller 6 end output high level is opened timer 7 simultaneously and is picked up counting, and this moment, electric capacity 2 was in charged state, and as voltage Vin during greater than Vref, Vout is a high level, and this moment, timer 7 stopped timing, and was t1 between clocking.
4, repeating step 2,3, until the timing T that arrives timer 8.
5, the P1 of controller 6 end output low level, measuring process finishes.
If when T time internal timer 7 amounts to n time, the 1st time timing time is t1, the n time timing time is tn, then total charging time: T1=t1+t2+t3+ ... + tn.
Because the Vin terminal voltage fluctuates among a small circle round Vref in the measuring process, can be similar to and think that Vin voltage remains unchanged, so the charge volume of electric capacity 2 equals discharge electricity amount, then have:
(1)
Q1: total charge capacity
Q2: total discharge electricity amount
(2)
Figure 2011200632605100002DEST_PATH_IMAGE003
(3)
I1: charging current
I2: discharge current
T1: total charging time
T: thermometric T.T.
Vcc: supply voltage
Vin: electric capacity 2 both end voltage
R1: resistance 1 resistance
Can get by formula (1) (2) (3):
Figure 720024DEST_PATH_IMAGE004
(4)
By (4) as can be known, under the certain situation of thermometric T.T. T and power source voltage Vcc, electric capacity 2 both end voltage Vin are directly proportional with total charging time T1, because the Vin terminal voltage fluctuates among a small circle round Vref in the measuring process, can be similar to and think that Vin voltage equals Vref, then has:
Figure 2011200632605100002DEST_PATH_IMAGE005
(5)
Because the existence of constant current source 3, the electric current of the temperature sensor of flowing through is always I, then has:
Figure 811345DEST_PATH_IMAGE006
(6)
According to (4) (5) (6), then have:
Figure 2011200632605100002DEST_PATH_IMAGE007
(7)
The resistance value of temperature sensor 4 can be calculated by formula (7), thereby temperature value can be extrapolated.
Because temperature sensor 4 both end voltage Vref are directly proportional with duration of charging T1, therefore can get the magnitude of voltage of Vref, the resistance value of temperature sensor can be calculated according to Ohm law, thereby temperature value can be extrapolated.
Above embodiment is one of preferred plan of the present utility model, is not that the utility model is done any pro forma restriction, also has other variant and remodeling under the prerequisite that does not exceed the technical scheme that claim puts down in writing.

Claims (5)

1. a high precision measuring temperature module that is applied to calorimeter comprises temperature measurement circuit, control module and timing unit, and described temperature measurement circuit links to each other with described control module, and described control module links to each other with described timing unit; It is characterized in that: described temperature measurement circuit comprises resistance (1), electric capacity (2), constant current source (3), temperature sensor (4), comparer (5), one end of described resistance (1) links to each other with described controller, the other end of described resistance (1) respectively with an end of described electric capacity (2), the positive input terminal of described comparer (5) links to each other, the other end of described electric capacity (2) links to each other with ground, described constant current source (3) is with after described temperature sensor (4) is in parallel, one end links to each other with ground, the other end links to each other with the negative input end of described comparer (5), and the output terminal of described comparer (5) links to each other with described control module.
2. a kind of high precision measuring temperature module that is applied to calorimeter according to claim 1, it is characterized in that: described temperature sensor (4) is a platinum sensor.
3. a kind of high precision measuring temperature module that is applied to calorimeter according to claim 1, it is characterized in that: described resistance (1) is that low temperature floats precision resister.
4. according to claim 1 or 2 or 3 described a kind of high precision measuring temperature modules that are applied to calorimeter, it is characterized in that: described control module comprises controller (6), and described controller (6) is a microprocessor.
5. according to claim 1 or 2 or 3 described a kind of high precision measuring temperature modules that are applied to calorimeter, it is characterized in that: described timing unit comprises timer (8), timer (7), and described timer (8), timer (7) link to each other with described control module respectively.
CN2011200632605U 2011-03-11 2011-03-11 High-accuracy temperature-measuring module for heat meter Expired - Fee Related CN201964976U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103674338A (en) * 2013-12-06 2014-03-26 浙江盾安自控科技有限公司 Heat supply metering control system and measuring method thereof
CN104142185A (en) * 2013-05-10 2014-11-12 重庆金美通信有限责任公司 Oil and water temperature collecting circuit for hydraulic retarder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104142185A (en) * 2013-05-10 2014-11-12 重庆金美通信有限责任公司 Oil and water temperature collecting circuit for hydraulic retarder
CN103674338A (en) * 2013-12-06 2014-03-26 浙江盾安自控科技有限公司 Heat supply metering control system and measuring method thereof

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Owner name: LIERDA TECHNOLOGY GROUP CO., LTD.

Free format text: FORMER NAME: LIERDA SCIENCE AND TECHNOLOGY CO., LTD.

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Address after: Hangzhou City, Zhejiang province 310001 Dengyun Road No. 425

Patentee after: Lierda Science & Technology Group Co., Ltd.

Address before: Hangzhou City, Zhejiang province 310001 Dengyun Road No. 425

Patentee before: Lierda Science and Technology Co., Ltd.

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Granted publication date: 20110907

Termination date: 20160311

CF01 Termination of patent right due to non-payment of annual fee