CN2284948Y - Thermal-conductivity type liquid level measuring controller - Google Patents
Thermal-conductivity type liquid level measuring controller Download PDFInfo
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- CN2284948Y CN2284948Y CN 96207986 CN96207986U CN2284948Y CN 2284948 Y CN2284948 Y CN 2284948Y CN 96207986 CN96207986 CN 96207986 CN 96207986 U CN96207986 U CN 96207986U CN 2284948 Y CN2284948 Y CN 2284948Y
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Abstract
The utility model relates to a heat conductivity type liquid level measuring controller. Heat-sensitive elements of probes are respectively arranged in each casing in a thin and straight cylinder shape. A heater is arranged in one of the casings, and separated from the other casing in the thin and straight cylinder shape. One ends of the casings in the thin and straight cylinder shape are closed, the other ends are open, and the open ends are fixedly connected with one end of a cylindric casing. Gaps of the heat-sensitive elements and the heater with each casing in the thin and straight cylinder shape are filled and closed by heat-conductive insulating substances. A detecting control circuit is connected with a voltage comparator by a probe signal generating circuit. The output is connected to a trigger and a register, and then connected to an output relay through a manual switch. The utility model has the advantages of good transient response, easy combination with various control circuits, simple measuring circuit and long service life.
Description
The utility model relates to a kind of fluid level measuring and controlling instrument device, particularly a kind of thermal conductance type liquid level measuring controller.
At present, usually adopt float, mercury contact, optic probe, acoustic probes and electricity to lead sensor measurement liquid levels such as probe, these surveying instruments of measuring liquid level can only be used to measure the liquid level with a kind of liquid usually, and can't measure the interfacial level of different liquids, and when the liquid level of measuring with a kind of liquid, there is weak point in various degree respectively.As utilize the measurement of float owing to have mechanical drive, reliability is relatively poor; Utilize mercury contact then owing to must use mercury, cause when utilizing this method and in production, use and the removal process of surveying instrument, will cause severe contamination environment with toxicity; Then often contaminated and acoustic jamming reduces measuring accuracy to the method for optic probe formula and acoustic probes because of the probe of measuring instrument respectively; Though leading probe, electricity can utilize different liquids to have the interface of the principle measurement different liquids of different conductances, but it not only can not be used to measure iknsulating liquid, and utilize the measuring instrument of this method in measuring process, to understand electrolyte and corroding electrode, and the measurement of inapplicable explosion-proof environment.
The purpose of this utility model is that a kind of heat-conducted liquid level gauging controller that can improve the liquid surface height of the different non-blending agent of measuring accuracy and energy measurement is provided at the deficiency of above-mentioned prior art.
The purpose of this utility model is achieved in that a kind of thermal conductance type liquid level measuring controller, it is by probe, connect signal cable, connecting circuit of measurement and control again forms, wherein Tan Tou thermal sensing element is placed on respectively separately in the housing of thin straight-tube shape, well heater place with one of above-mentioned housing in, and leave with the housing of another thin straight-tube shape, the one end sealing of two thin straight-tube shape housings, the other end opens wide, and open end all is fixed in an end of cylindrical shell, and communicates with the cavity of cylindrical shell, there is an osculum at the other end center of cylindrical shell, and sealing is filled by the heat conductive insulating material in the space between the housing of thermal sensing element and well heater and thin separately straight-tube shape; Described detection control circuit produces circuit by probe signal and connects voltage comparator, and output is connected to the trigger register of holding concurrently, and it connects output relay by a manual switch again.
Described well heater can place separately in the thin straight-tube shape, and be equipped with thermal sensing element one thin the straight-tube shape housing is parallel is close to, and leave with another housing that is equipped with another thin straight-tube shape of thermal sensing element.
Described each thin straight-tube shape housing can be metal material.
Described trigger is held concurrently register by the moving switch of reverser catcher.
Described probe signal produces circuit by thermal sensing element Rtn, and the Rtf series connection is in parallel with well heater, and two termination power positive cathodes, the voltage signal line of output are from Rtn, and draw the centre of Rtf series connection.
Described probe signal produces that circuit one route diode Dtf connects with resistance R _ f and from the two centre extraction voltage signal Vsf, another route diode Dtn connects with resistance R n and extraction voltage signal Vsn in the middle of the two, well heater T is in this two-way circuit parallel connection, be connected to power positive cathode, voltage signal Vsf, Vsn input to a difference amplifier, and the input end of testing circuit is received in the output of difference amplifier.
The utility model be not subjected within the specific limits measured medium temperature, pressure, density to influence applicability strong, get rid of the mechanical drive link fully and have high reliability, the heat conductive insulating material all adopts solid material to be easy to the probe encapsulation, and avirulence material safe and sanitary (as can be used for the control of potable water liquid level), the direct interference that may suffer is few, also helps improving its reliability; Because object thermal capacity exists, and makes its transient response good, thereby is easy to be connected with all kinds of control circuits, its metering circuit is simple, long service life.
Below in conjunction with accompanying drawing and specific embodiments the utility model is described in further detail.
Fig. 1 is one of sonde configuration synoptic diagram of the present utility model and probe signal circuit theory diagrams;
Fig. 2 is two of sonde configuration synoptic diagram of the present utility model and probe signal circuit theory diagrams;
Fig. 3 constitutes synoptic diagram for the utility model system;
Fig. 4 detects the control circuit schematic diagram for the utility model;
Fig. 5 is that another preferred embodiment of the utility model detects the control circuit schematic diagram.
Referring to accompanying drawing 1-5.
As shown in Figure 1, the thermal sensing element Rtn of probe of the present utility model, Rnf is placed on the housing 1 of thin straight-tube shape separately respectively, in 2, heater resistance wire T or place in the housing 1 closes on thermistor Rtn, or place as shown in Figure 2 housing 1 ' interior and 1 parallel being close to of housing, leave with housing 2, housing 1,2,1 ' end sealing, the other end opens wide, open end all is fixed in an end of cylindrical shell 3, and communicate with the cavity of cylindrical shell 3, there is an osculum 4 at the other end center of cylindrical shell 4, and sealing is filled by the heat conductive insulating material in the space between the housing of thermal sensing element and well heater and thin straight-tube shape separately.The utility model utilizes the temperature conductivity difference of the different fluid medium of non-mixing, and the interface between probing medium, it uses the well heater that can keep constant temperature rise, and two heat-sensitive elements are set in its vicinity, wherein press close to well heater for one, another is then far away apart from well heater.Producing with the well heater around well heater when well heater is worked is the temperature gradient distribution on summit.Because two heat-sensitive elements are different with the well heater distance, thereby the temperature value that records is also different.Can record certain measured medium with the difference that detects two heat-sensitive element measured values then and place having or not of well heater and heat-sensitive element position.For example air (diesel oil) is different with the temperature conductivity of water, and utilizing said method can record the element contact site is air (diesel oil) or water.Thereby obtain the discrete interface information of relevant fluid.
Well heater generally adopts lectrothermal alloy wire winding or electrothermal ceramic plate to make through the insulation encapsulation.
Probe is packed in the tested casing, with having or not of way of contact detection probe position measured medium, with the degree of depth of probe insertion casing, survey the height whether tested interface arrives, probe is that electric signal is delivered to the detection controller through signal cable with the medium interface information translation in the casing.Detect controller this signal is compared analysis and waits until control through the closed or disconnection of steering logic driving output contact, for low capacity, simple servo control mechanism also can directly be controlled by detection controller output contact.
As shown in Figure 4, the application of a large amount of embodiment of the utility model is to adopt two probes to do liquid level spacing control up and down, in order to liquid in the case is done the control of most significant digit and lowest order, promptly when liquid level arrives lowest order the work of control pump motor to case in liquid make-up, pump motor quits work and finishes a control cycle when liquid level arrives most significant digit, Th is installed in a casing high position for this reason, and Tl is installed in the casing low level, detects the liquid level situation of bound position respectively.Wherein probe signal produces circuit by thermal sensing element Rtn, and the Rtf series connection is in parallel with well heater, and two termination power positive cathodes, the voltage signal line V of output are from Rtn, and draw the centre of Rtf series connection, is connected to the input end of testing circuit; Probe signal produces that the route diode Dtf also can be as shown in Figure 5 connects with resistance R _ f and from the two centre extraction voltage signal Vsf, another route diode Dtn connects with resistance R n and extraction voltage signal Vsn in the middle of the two, well heater T is in this two-way circuit parallel connection, be connected to power positive cathode, voltage signal Vsf, Vsn input to a difference amplifier, and the input end of testing circuit is received in the output of difference amplifier.Be example now with as shown in Figure 4 probe signal circuit.Signal voltage Vs is drawn in Rtn and Rtf junction, and Vs equals the partial pressure value of V+ on Rtn and Rtf:
Because Rtn is different with the distance of the relative T of Rtf, sensed the temperature difference, its resistance value is difference just, is example with the negative tempperature coefficient thermistor, Rtn＜Rt.Their difference size depends on the temperature conductivity of measured medium, the difference of ignoring Rtn and Rtf self parameter, when the measured medium temperature conductivity is tending towards infinity, Rtn=Rtf, this moment, Vs reached ultimate value: V+/2, so Vs temperature conductivity with measured medium in certain interval of 0～V+/2 changes.Because the measured medium average temperature value is to Rtn, Rtf causes that common mode variations does not directly influence difference, so Vs and measured medium medial temperature are irrelevant.
Setup unit is obtained the setting voltage of comparer U2 and U3 through adjusting resistance R vh and Rvl from power supply V+.And the thermal conductance signal voltage value of the two media that need distinguish the interface is depended in the setting of setting voltage, is example with the interface of empty G﹠W; Setting voltage is Vp, when probe is in the air, and picked up signal voltage Vso; When being in the water, picked up signal voltage Vsw.Because the air temperature conductivity is lower than water, has: Vso＜Vsw, then set Vso＞Vp＞Vsw, consider noise margin, Vp should respectively keep certain distance with Vso and Vsw
Signal Processing is as follows:
Preconditioning Rvh makes comparer U2 positive input terminal current potential be lower than when medium is arranged H point current potential and H point current potential (establish the measured medium temperature conductivity and be higher than the air temperature conductivity) when being higher than no medium.Like this, when liquid level arrived upper limit position, comparer U2 negative input end current potential was higher than positive input terminal, and comparer U2 is output as 0V, and liquid is full in the luminous indication case of LEDh, and vice versa.
Preconditioning Rvl makes comparer U3 positive input terminal current potential be lower than when medium is arranged L point current potential and L point current potential when being higher than no medium, like this, when liquid level is lower than the lower position, comparer U2 negative input end current potential is lower than positive input terminal, comparer U2 is output as V+, LED1 extinguishes liquid sky in the indication case, and vice versa.
Comparer U2, U3 output terminal O1, O2 has three kinds of state S1, S2, S3 is as follows:
The S1--height, all there are liquid: O1=oV, O2=oV in low level probe place
The S2--height, low level probe place does not all have liquid: 1=V+, O2=V+
There is liquid at S3--low level probe place, and high-order probe place does not have liquid: O1=oV, and O2=V+,
S1 state: O1, O2 are oV, O3=oV.Trigger is held concurrently the negative input end current potential of register U4 less than positive input terminal current potential O4=V+.The position of hand switch K is as figure, output relay U6 control end equipotential up and down then, and no current flows through, and external circuit keeps disconnecting, and water pump is not worked.
S2 state: O1, O2 is V+, O3=V+, trigger is held concurrently the negative input end current potential of register U4 greater than positive input terminal current potential O4=oV, the position of hand switch K is as figure, and then current potential does not wait about the output relay U6 control end, and electric current flows through U6 through current-limiting resistance R10, external circuit remains closed, pump working.
S3 state: O1 is V+, and O2 is oV, and it is the positive input terminal current potential that the situation of the output terminal O4 of U4 this moment of V+/2. depends on U4 that O3=V+/2.O3 makes the negative input end current potential of U4.Be that R7 is in parallel with R6 under the situation of oV when the o4 preceding state, because R5=R6=R7, positive input terminal current potential＜V+/2 of U4, i.e. the negative input end current potential of positive input terminal current potential＜U4 of U4, O4 is 0V.Water pump works on; Be that R7 is in parallel with R5 under the situation of V+ when the O4 preceding state, since R5=R6=R7, positive input terminal current potential＞V+/2 of U4, it is the negative input end current potential of positive input terminal current potential＞U4 of U4, O4 is V+, and water pump continues to stop, like this U4 play a part the memory last next state finish sequential logic.
As a Schmidt trigger, U4 cooperates C4 to get rid of U2, and contingent shake and noise in the U3 switching process make the gating pulse shaping.
U5 is a reverser, and its output is total opposite with O4, when this makes selector switch K connect the U5 output terminal state of U6 and above-mentioned situation antithesis, this just meets does draining to liquid in the case and controls.
Another preferred embodiment of the present utility model is for to make approximately continuous height detection with the different a string probe of insertion depth to the measured medium interface.For example, can probe be set on oil tank continuously with interval, when pasta rose, each probe outputed signal to testing circuit successively, detected control circuit and outputed signal to demonstration or topworks more successively.Wherein probe signal produces the circuit that can be as shown in Figure 4, also can be circuit as shown in Figure 5.Now as shown in Figure 5.Probe signal generation circuit is divided into three the tunnel: the one tunnel and is added in electric heater Tr two ends, makes its work produce stable temperature rise; Two-way is added in two semiconductor diode Dtf through Rf, Rn respectively in addition, make its forward conduction on the DTn, produce forward voltage drop Vsf and the about 600mv--700mv of Vsn (is example with the silicon semiconductor diode), be beneficial to its positive temperature characteristic (pressure drop with temperature according to the appointment-rate of change of 2mv/ ℃ changes and linear good) hold with vsn at Vsf and draw temperature measurement signal, because Dth is different with the distance of the relative Tr of Dtn, the difference of Vsf and Vsn two voltages depends on the temperature conductivity of visiting medium of living in.
U is a difference amplifier, the potential difference (PD) of Vsf and Vsn is detected and amplifies Rf/Ri doubly.Comparer U2, Vo enter the comparison input end of U2, and other is with thermistor temperature-sensing element circuit.Dtf and Dtn can select for use schottky diode or the good diode of carbonization then can obtain good linearity.Adopt the semiconductor PN temperature-sensing element because good linearity is more suitable for being used in the very wide occasion in probe work temperature territory.
The polarity that setting voltage Vp, Vs enter comparer U4 is decided by the direction of control, and is also relevant with the connection of reverser U5, and preface connects below the aforesaid supposition with a kind of specific example that is controlled to be:
Require output relay U6 when probe is in the air dielectric, to work; Stop in the time of in being in aqueous medium, and example among reverser U5 such as the figure, connect positive source, Vp then, the polarity that Vs inserts U2 is as follows:
When probe is in the air, Vs＜Vp, Vo is output as oV.Output relay U6 obtains conducting and moves, the closing of contact, and topworks powers up.When probe is in the water, Vs＞Vp, Vo is output as V+, output relay U6 no current flows through, and open the contact, and topworks has a power failure, if required control connection opposite or output relay U6 is opposite, Vp so, the polarity that Vs inserts comparer U4 is also opposite, can obtain required control equally.
Output relay U6 is a DC relay that conforms to the controller operating voltage, and contact capacity is by the power decision of topworks.This topworks can be a magnetic starter line bag, and the starter contact drives pump motor or motorized valve work.
Heater design power is by the sensitivity of design temperature rise and thermal sensing element and the thermal capacity decision of probe encapsulating housing, and the fast more noise margin of high response speed is also high more more in the sensitivity of the big more probe of design temperature rise.Yet the power of the big well heater of temperature rise is big, can make the power circuit complexity also be unfavorable for saves energy and director's life-span, generally so that enough immunities to interference and appropriate responsive speed be as the criterion (heat conduction formula fluid thing position is discrete detect survey method be not suitable for using response speed is required in the very fast control) to be arranged.
Thermal sensing element preferably adopts resistance class component (comprising metal fever resistance and the semiconductor heat resistance) thermal sensing element of highly sensitive good linearity.
Claims (6)
1, a kind of thermal conductance type liquid level measuring controller, it is by probe, connect signal cable, connecting circuit of measurement and control again forms, it is characterized in that: the thermal sensing element of described probe is placed on respectively separately in the housing of thin straight-tube shape, well heater place with one of above-mentioned housing in, and leave with the housing of another thin straight-tube shape, the one end sealing of two thin straight-tube shape housings, the other end opens wide, and open end all is fixed in an end of cylindrical shell, and communicates with the cavity of cylindrical shell, there is an osculum at the other end center of cylindrical shell, and sealing is filled by the heat conductive insulating material in the space between the housing of thermal sensing element and well heater and thin separately straight-tube shape; Described detection control circuit produces circuit by probe signal and connects voltage comparator, and output is connected to the trigger register of holding concurrently, and it connects output relay by a manual switch again.
2, a kind of thermal conductance type liquid level measuring controller according to claim 1, it is characterized in that: described well heater can place separately in the thin straight-tube shape, and be equipped with thermal sensing element one thin the straight-tube shape housing is parallel is close to, and leave with another housing that is equipped with another thin straight-tube shape of thermal sensing element.
3, a kind of thermal conductance type liquid level measuring controller according to claim 1 and 2 is characterized in that: described each thin straight-tube shape housing can be metal material.
4, a kind of thermal conductance type liquid level measuring controller according to claim 1 is characterized in that: described trigger is held concurrently register by the moving switch of reverser catcher.
5, a kind of thermal conductance type liquid level measuring controller according to claim 1 is characterized in that: described probe signal produces circuit by thermal sensing element Rtn, the Rtf series connection, in parallel with well heater, two termination power positive cathodes, the voltage signal line of output are from Rtn, and draw the centre of Rtf series connection..
6, a kind of thermal conductance type liquid level measuring controller according to claim 1, it is characterized in that: described probe signal produces that circuit one route diode Dtf connects with resistance R _ f and from the two centre extraction voltage signal Vsf, another route diode Dtn connects with resistance R n and extraction voltage signal Vsn in the middle of the two, well heater T is in this two-way circuit parallel connection, be connected to power positive cathode, voltage signal Vsf, Vsn input to a difference amplifier, and the input end of testing circuit is received in the output of difference amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96207986 CN2284948Y (en) | 1996-04-24 | 1996-04-24 | Thermal-conductivity type liquid level measuring controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96207986 CN2284948Y (en) | 1996-04-24 | 1996-04-24 | Thermal-conductivity type liquid level measuring controller |
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| Publication Number | Publication Date |
|---|---|
| CN2284948Y true CN2284948Y (en) | 1998-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96207986 Expired - Fee Related CN2284948Y (en) | 1996-04-24 | 1996-04-24 | Thermal-conductivity type liquid level measuring controller |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435257A (en) * | 2011-09-30 | 2012-05-02 | 广东天际电器股份有限公司 | Liquid level sensor and liquid level detection method thereof |
| CN102628706A (en) * | 2012-05-02 | 2012-08-08 | 科博达重庆汽车电子有限公司 | Subsection type liquid level measuring module |
| CN108254041A (en) * | 2018-03-18 | 2018-07-06 | 李晨天 | Asynchronous-sampling thermal conductance type liquid level sensor |
| CN108387291A (en) * | 2018-03-18 | 2018-08-10 | 李晨天 | Synchronized sampling thermal conductance type liquid level sensor |
-
1996
- 1996-04-24 CN CN 96207986 patent/CN2284948Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435257A (en) * | 2011-09-30 | 2012-05-02 | 广东天际电器股份有限公司 | Liquid level sensor and liquid level detection method thereof |
| CN102628706A (en) * | 2012-05-02 | 2012-08-08 | 科博达重庆汽车电子有限公司 | Subsection type liquid level measuring module |
| CN102628706B (en) * | 2012-05-02 | 2014-04-02 | 科博达重庆汽车电子有限公司 | Subsection type liquid level measuring module |
| CN108254041A (en) * | 2018-03-18 | 2018-07-06 | 李晨天 | Asynchronous-sampling thermal conductance type liquid level sensor |
| CN108387291A (en) * | 2018-03-18 | 2018-08-10 | 李晨天 | Synchronized sampling thermal conductance type liquid level sensor |
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Free format text: CORRECT: PATENTEE ADDRESS; FROM: 100095 BEIJING ANALYTICAL INSTRUMENT FACTORY DORMITORIES, WENQUAN,HAIDIAN DISTRICT, BEIJING 3-2-4 TO: ROOM 1802, BUILDING 4, NO. #, YIER, YUETAN STREET(WEST), XICHENG DISTRICT, BEIJING CITY, 100045 |
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Address after: 100045 Beijing city Xicheng District Yuetan Street No. two B Building No. 4 room 1802 Zhong Anyuan Patentee after: Zhong Anyuan Address before: 100095 \u3001 Haidian District Beijing hot spring Beijing analytical instrument factory dormitory 3-2-4 Patentee before: Zhong Anyuan |
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Owner name: NO. 702, BUILDING 2, QU, 2, SANLIHE, XICHENG DISTR Free format text: FORMER NAME OR ADDRESS: ROOM 1802, BUILDING 4, NO. #, YIER, YUETAN STREET(WEST), XICHENG DISTRICT, BEIJING CITY |
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| CP03 | Change of name, title or address |
Address after: 100045, No. 2, building 2, Three Mile 702, Xicheng District, Beijing Patentee after: Zhong Anyuan Address before: Beijing city Xicheng District Yuetan Street No. two B Building No. 4 room 1802 Patentee before: Zhong Anyuan |
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| 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 |