CN208606904U - A kind of isothermal automatic calorimeter outer cylinder water temperature temperature difference monitoring device - Google Patents
A kind of isothermal automatic calorimeter outer cylinder water temperature temperature difference monitoring device Download PDFInfo
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- CN208606904U CN208606904U CN201821431351.8U CN201821431351U CN208606904U CN 208606904 U CN208606904 U CN 208606904U CN 201821431351 U CN201821431351 U CN 201821431351U CN 208606904 U CN208606904 U CN 208606904U
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- temperature difference
- outer cylinder
- latch cicuit
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- monitoring device
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Abstract
The utility model discloses a kind of isothermal automatic calorimeter outer cylinder water temperature temperature difference monitoring devices, including thermocouple, compensating wire, signal processing circuit board, voltage setting rheostat and light emitting diode, it is integrated with sequentially connected temperature difference heat potential modulation circuit, low noise pre-amplification circuit, second level low-noise operational amplifier amplifying circuit, lock-up amplifier circuit on the signal processing circuit board and compares latch cicuit, the relatively latch cicuit includes comparator and rest-set flip-flop；The thermocouple is connected to the input terminal of the temperature difference heat potential modulation circuit on the signal processing circuit board by the compensating wire, the comparator connection of voltage setting rheostat latch cicuit compared with described, the rest-set flip-flop connection of light emitting diode latch cicuit compared with described.The utility model monitoring result is sensitive, reliable.
Description
Technical field
The utility model relates to coal detection device technical field, specifically a kind of isothermal automatic calorimeter outer cylinder water temperature temperature
Poor monitoring device.
Background technique
The value of fuel be that in combustion process can heat release, therefore calorific value be assessment the most important finger of fuel mass
Mark.China is big coal country, and calorific value is the determinant of coal quality quality, and the measurement of calorific value at present uses calorimeter substantially
It completes.The Measurement reliability of calorimeter is that heating-value determination is accurately basic.
213-2008 pairs of national standard GB/T are set with the principle of the calorific value of method of oxygen steel bomb measurement coal, experiment condition, instrument
It is standby etc. to make regulation stringent in detail.Wherein there is following regulation to isothermal automatic calorimeter outer cylinder water temperature temperature difference monitoring outer cylinder:
Isothermal calorimeter always happens heat exchange between inner cylinder and outer letter during the test, should to this dispersed heat
Correction, method are plus a corrected value in temperature rise, this corrected value is known as cooling corrected value.Outer cylinder water temperature is to calculate
One important parameter of cooling corrected value, it should be noted that outer cylinder temperature refers to outer cylinder water body bulk temperature, i.e. water body cannot
In the presence of the Temperature Distribution not allowed.
213-2008 pairs of outer cylinder water temperatures of national standard GB/T make following strict regulations: in the entire experiment process, outer cylinder
Water temperature variation is no more than ± 0.1 DEG C, and outer cylinder thermometer minimum scale division is 0.1 DEG C, when this further illustrates the water temperature of outer cylinder
It keeps in balance at quarter uniformly, cannot deposit does not allow the temperature difference.
Existing calorimeter directly gives to outer cylinder water temperature and measures parameter on the market.If oxygen bomb, inner cylinder or outer
There is deformation and causes entire calorimetric system heat transfer unbalanced or the decline of the agitator power of calorimeter in cylinder, and stirring is caused to imitate
Rate reduces.These not noticeable potential factors, which all may cause water body presence, does not allow the temperature difference, and then calorimeter measurement result
Reliability remains to be discussed.
Therefore, it is monitored by the outer cylinder water temperature temperature difference and determines whether the water body between outer cylinder and inner cylinder is balanced to isothermal automatic calorimeter
The accuracy of cooling correction value has a very important significance.
Summary of the invention
The purpose of this utility model is in view of the deficiency of the prior art, to provide a kind of isothermal automatic calorimeter outer cylinder water
Temperature difference monitoring device.
The purpose of this utility model is achieved through the following technical solutions:
A kind of isothermal automatic calorimeter outer cylinder water temperature temperature difference monitoring device, including thermocouple, compensating wire and signal processing electricity
Road plate, which is characterized in that further include voltage setting rheostat and light emitting diode, be integrated on the signal processing circuit board according to
The temperature difference heat potential modulation circuit of secondary connection, low noise pre-amplification circuit, second level low-noise operational amplifier amplifying circuit, locking amplification
Circuit and compare latch cicuit, the relatively latch cicuit includes comparator and rest-set flip-flop；The thermocouple passes through the benefit
The input terminal for the temperature difference heat potential modulation circuit that conducting wire is connected on the signal processing circuit board is repaid, the voltage sets variable resistance
The comparator of device latch cicuit compared with described connects, and the rest-set flip-flop of light emitting diode latch cicuit compared with described connects
It connects.
In the further design scheme of the utility model, the cold end of above-mentioned thermocouple is connect with the compensating wire.
In the further design scheme of the utility model, above-mentioned water temperature temperature difference monitoring device has 2-4 set, uniformly distributed in perseverance
Between the outer cylinder and inner cylinder of warm formula calorimeter.
The utility model have it is following prominent the utility model has the advantages that
The utility model uses thermocouple as temperature difference detection sensor, can directly be surveyed using the pyroelectric effect of thermocouple
Two o'clock temperature difference is measured, and output signal is easy to transmit and convert, but to vary with temperature rate small for its thermoelectrical potential, often temperature change
Several hundred μ V are arrived in 1k, thermoelectrical potential variation tens, and high sensitivity can achieve very high precision.Setting rheostat by voltage can be with
According to the varying environment condition of different calorimeters, correspondingly adjustment setting contrast potential, monitoring result are sensitive, reliable.
Detailed description of the invention
Fig. 1 is the connection schematic diagram of isothermal automatic calorimeter outer cylinder water temperature temperature difference monitoring device in embodiment；
Fig. 2 is temperature difference heat potential modulation circuit schematic diagram in embodiment；
Fig. 3 is low noise pre-amplification circuit schematic diagram in embodiment；
Fig. 4 is second level low-noise operational amplifier amplifying circuit schematic diagram in embodiment；
Fig. 5 is lock-up amplifier circuit schematic diagram in embodiment；
Fig. 6 is to compare latch cicuit schematic diagram in embodiment；
In figure, 1- calorimeter inner cylinder, 2- calorimeter outer cylinder, 3- thermocouple, 4- compensating wire, 5- signal processing circuit board,
6- temperature difference heat potential modulation circuit, 7- low noise pre-amplification circuit, 8- second level low-noise operational amplifier amplifying circuit, 9- locking amplification
Circuit, 10- compare latch cicuit, 11- light emitting diode, and 12- voltage sets rheostat.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and embodiments.
Referring to Fig. 1, a kind of isothermal automatic calorimeter outer cylinder water temperature temperature difference monitoring device, including thermocouple 3,4 and of compensating wire
Signal processing circuit board 5, which is characterized in that further include voltage setting rheostat 12 and light emitting diode 11, the signal processing
Sequentially connected temperature difference heat potential modulation circuit 6, low noise pre-amplification circuit 7, second level low noise fortune are integrated on circuit board 5
It puts amplifying circuit 8, lock-up amplifier circuit 9 and compares latch cicuit 10, the relatively latch cicuit 10 includes that comparator and RS are touched
Send out device；The thermocouple 3 is connected to the temperature difference heat potential amplitude modulation on the signal processing circuit board 5 by the compensating wire 4
The input terminal of circuit 6, the cold end of thermocouple 3 are connect with the compensating wire 4, and the voltage setting rheostat 12 is compared with described
The comparator of latch cicuit 10 connects, the rest-set flip-flop connection of the latch cicuit 10 compared with described of light emitting diode 11.This
In embodiment, 2 sets of water temperature temperature difference monitoring devices have symmetrically been laid between the outer cylinder 2 and inner cylinder 1 of isothermal automatic calorimeter.
Thermocouple 3 is placed between the outer cylinder 2 of isothermal automatic calorimeter and inner cylinder 1, and when 3 both ends of thermocouple, presence does not allow
When the temperature difference, 3 thermoelectrical potential of thermocouple is by the temperature difference heat potential modulation circuit 6 outside the transmission access of compensating wire 4, such as Fig. 2.Wherein
The carrier signal of temperature difference heat potential modulation circuit is provided by carrier signal generation circuit, carrier signal generally can for sine wave or
Person's square wave.Carrier signal is selected as square wave in the present embodiment.
Temperature difference heat potential modulation circuit is to migrate the frequency spectrum of direct current and small temperature difference heat potential for modulated signal ω0,
Other noises such as 1/f noise of subsequent process circuit can be effectively avoided on frequency band, be subsequent 9 signal of lock-up amplifier circuit
Channel provides brewed input signal.
Modulation circuit principle is as follows:
Modulation circuit, which is all made of, in engineering inhibits suppressed-carrier double side band amplitude modulation mode DSB, and which makes the total of signal
Power all becomes sideband power, makes efficiency close to 100%
SDSB(t)=f (t) cos (w0t+θ0)
The AD534 integrated multiplier that the nucleus module U1 of the modulation circuit schematic diagram of temperature difference heat potential shown in Fig. 2 is used, according to
Its working principle formula:
(X1-X2)(Y1-Y2)=Vsf(Z1-Z2)
X1Meet input signal f (t), Y1Input carrier signal such as cos (w0t+θ0), VsfMeet 3V, Z1With pin V0Phase continuous cropping
For output, other pins X2、Y2、Z2It is grounded.
Low noise operational amplifier noise objective is already close to discrete active device, but in order to improve the noise of whole system
Characteristic.Need to add before integrated transporting discharging the discrete component amplifier of level-one or two-stage, i.e. low noise pre-amplification circuit 7 and second level
Low-noise operational amplifier amplifying circuit 8, circuit is as shown in Figure 3, Figure 4.
Discrete component amplifier uses partial pressure type bias stabilization circuit in low noise pre-amplification circuit, can reduce temperature
Influence to quiescent point.Its low level signal amplification gain calculation formula is as follows:
When selecting discrete component, three aspect problems are considered
1, its equivalent input noise voltage and equivalent input noise current are small as far as possible；
2, the frequency range that main components Minimum noises coefficients are realized will be with carrier signal w0Close or w0Close to component
The frequency range that Minimum noises coefficients are realized
3, according to the resistance R of signal sourcesSize, select suitable type device, so as to best source resistance RsoApproach signal
The resistance R in sources, to reach noise matching.Best source resistance RsoIs defined as:
Second level low-noise operational amplifier amplifying circuit is as shown in Figure 4；Second level low-noise operational amplifier amplifying circuit include first voltage with
With device, second voltage follower and see-saw circuit, wherein the voltage signal of discrete component amplifying circuit through first voltage with
It is supplied to see-saw circuit with device, the amplification factor of see-saw circuit can be adjusted by potentiometer, and output signal is passed through
Second voltage follower is supplied to locking phase amplifying circuit.Integrated transporting discharging can select American Analog Devices AD8656,
The integrated transporting dischargings such as AD8615, ADA4051, they have high input impedance, low noise, and the good characteristic of low drifting is very suitable to
Small signal amplification circuit.
In second level low-noise operational amplifier amplifying circuit 8Feedback resistance R simultaneously2Resistance value
It is adjustable；
According to the filtering principle of locking phase amplifying circuit, sense channel signal includes measured signal and noise signal, enables detection
Channel signal is f1=s1(t)+n (t), reference signal f2=s2(t), reference signal and measured signal s1(t) with frequency, it is assumed thats2(t)=sin (2 π ft), then two paths of signals is multiplied as follows:
After low-pass filtered device, as long as the cutoff frequency f of setting low-pass filtercut≤ f can filter out harmonic component,
Retain DC component, amplitude information and phase information comprising measured signal, DC componentIt is proportional to measured signal
Amplitude.
Lock-up amplifier circuit as shown in figure 5, nucleus module select be AD630, can be used for signal modulating/demodulating,
Synchronous detection, phase-detection, phase-sensitive detection and locking amplification.
Pin VoutSubsequent conditioning circuit is a reversed step low-pass low-pass filter, filters out AC compounent, demodulates detected
Signal.
Compare latch cicuit, there are bias voltage V as shown in fig. 6, experiment Shi Xianyong universal meter measures in systemp, then
Allow temperature change error according to experiment, the corresponding thermoelectrical potential of 3 material of thermocouple looked into obtains the temperature difference multiplied by system gain factor
Thermoelectrical potential Vt.Slide rheostat is adjusted, comparative level is adjusted to Vp+Vt.When comparison circuit exports high level, rest-set flip-flop is
In an ON state, light emitting diode keeps luminous alarm.Only under the conditions of hand-reset, can just light emitting diode be made to put out
It goes out.
The course of work of isothermal automatic calorimeter outer cylinder water temperature temperature difference monitoring device are as follows:
1, thermocouple 3 is placed as shown in Figure 1, and compensating wire 4 is drawn, access signal processing circuit board 5；
2, first measure in system that there are bias voltage V with universal meter before oxygen bomb ignitingp, temperature is then allowed according to experiment
Variation error, the corresponding thermoelectrical potential of 3 material of thermocouple looked into obtain temperature difference heat potential V multiplied by system gain factort.Adjust sliding
Rheostat adjusts comparative level to Vp+Vt。
If light emitting diode 11 shines before 3, testing, hand-reset is needed to compare latch cicuit 10.
Experiment is waited to terminate, if light emitting diode 11 shines before finally being measured calorific value data.Then say
Bright, there is the temperature-difference not allowed in the water body of outer cylinder 2, and experimental result is unreliable.Conversely, then experimental result is reliable.
The utility model also can be used as minimum temp difference measurer, be applied to a variety of temperature-controlling systems.
It is the preferred embodiment of the utility model above, it is all to change according to made by technical solutions of the utility model, it is produced
Function without departing from technical solutions of the utility model range when, belong to the protection scope of the utility model.
Claims (3)
1. at a kind of isothermal automatic calorimeter outer cylinder water temperature temperature difference monitoring device, including thermocouple (3), compensating wire (4) and signal
It manages circuit board (5), which is characterized in that further include voltage setting rheostat (12) and light emitting diode (11), the signal processing
It is low that sequentially connected temperature difference heat potential modulation circuit (6), low noise pre-amplification circuit (7), second level are integrated on circuit board (5)
Noise amplifier amplifying circuit (8), lock-up amplifier circuit (9) and compare latch cicuit (10), relatively latch cicuit (10) packet
Include comparator and rest-set flip-flop；The thermocouple (3) is connected to the signal processing circuit board by the compensating wire (4)
(5) input terminal of the temperature difference heat potential modulation circuit (6) on, the voltage set rheostat (12) latch cicuit compared with described
(10) comparator connection, the rest-set flip-flop connection of light emitting diode (11) latch cicuit (10) compared with described.
2. isothermal automatic calorimeter outer cylinder water temperature temperature difference monitoring device according to claim 1, which is characterized in that the thermoelectricity
The cold end of even (3) is connect with the compensating wire (4).
3. isothermal automatic calorimeter outer cylinder water temperature temperature difference monitoring device according to claim 1, which is characterized in that the water temperature
Temperature difference monitoring device has 2-4 set, between the uniformly distributed outer cylinder (2) in isothermal automatic calorimeter and inner cylinder (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821431351.8U CN208606904U (en) | 2018-08-31 | 2018-08-31 | A kind of isothermal automatic calorimeter outer cylinder water temperature temperature difference monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821431351.8U CN208606904U (en) | 2018-08-31 | 2018-08-31 | A kind of isothermal automatic calorimeter outer cylinder water temperature temperature difference monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208606904U true CN208606904U (en) | 2019-03-15 |
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ID=65679575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821431351.8U Active CN208606904U (en) | 2018-08-31 | 2018-08-31 | A kind of isothermal automatic calorimeter outer cylinder water temperature temperature difference monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208606904U (en) |
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2018
- 2018-08-31 CN CN201821431351.8U patent/CN208606904U/en active Active
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Address after: 210031 No. 10, Pudong Road, Pukou District, Jiangsu, Nanjing Patentee after: Guoneng Nanjing coal quality supervision and Inspection Co.,Ltd. Address before: 210031 No. 10, Pudong Road, Pukou District, Jiangsu, Nanjing Patentee before: GUODIAN NANJING COAL QUALITY SUPERVISION AND INSPECTION Co.,Ltd. |