CN201837439U - Float ball type liquid level measuring device capable of detecting float ball falling - Google Patents
Float ball type liquid level measuring device capable of detecting float ball falling Download PDFInfo
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- CN201837439U CN201837439U CN2010202672886U CN201020267288U CN201837439U CN 201837439 U CN201837439 U CN 201837439U CN 2010202672886 U CN2010202672886 U CN 2010202672886U CN 201020267288 U CN201020267288 U CN 201020267288U CN 201837439 U CN201837439 U CN 201837439U
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- liquid level
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Abstract
The utility model relates to a float ball type liquid level measuring device capable of detecting float ball falling. The operating principle of the float ball type level measuring device includes that a float ball floats on the surface of liquid by the aid of buoyancy, when the height of liquid level changes, the height of the float ball changes along with the height of liquid level, a magnet in the float ball can switch on a magnetic reed switch of a corresponding height in a liquid level detecting rod combination, a bias circuit generates direct-current voltage to a resistive network in the liquid level detecting rod combination, the bias circuit, the resistive network and the magnetic reed switch form a bleeder circuit, bleeder voltage is proportional to the height of the float ball, and output of the bleeder circuit is connected to a liquid level calculating circuit and converted into signals (such as 0-5 volts voltage and 4-20 milliamperes current) needed by a user so as to be used by the user. The float ball type liquid level measuring device is characterized in that firstly, the float ball type liquid level measuring device is provided with a float ball separation detecting circuit for detecting whether the float ball is separated from the liquid level detecting rod combination or not, and secondly, the float ball type liquid level measuring device is provided with a loop breakage detecting circuit for detecting whether a circuit in the liquid level detecting rod combination is broken (open-circuit) or not.
Description
Technical field
The utility model is to detect the float-ball type liquid level measuring equipment that ball float comes off about a kind of, refers to that especially a kind of electronic signal that liquid position in one barrel of groove can be converted to is for user's utilization and can detect ball float and break away from resistance networking broken string (open circuit) in combination of liquid level detecting bar or the combination of liquid level detecting bar.
The utility model can be applicable to the monitoring of industrial liquid levels such as chemical reservoir, oil groove, tank.
Background technology
Known float-ball type liquid level measuring equipment operating principle as shown in Figure 3, it comprises one first bias circuit (13), a first kind ratio/digital conversion circuit (14), a CPU (central processing unit) (15), liquid level detecting bar combination (23), it comprises resistance networking (26), a latch closure (29) of being made up of an above resistance (27) and an above magnetic reed switch (28), and a ball float (24).Ball float (24) inside comprises a magnet (25).Wherein first bias circuit (13) provides the stable DC bias voltage, suppose its voltage=Vbias, being connected to resistance networking (26) is by resistance R (n), R (n-1) ... to R (2), R (1) constant resistance (27) is in series, resistance networking (26) other end is to circuit ground, and the resistance value of R (n)～R (1) is all identical, suppose its resistance value=R, connect a magnetic reed switch (28) between every resistance (27), the other end of all magnetic reed switchs is connected to the input end of first kind ratio/digital conversion circuit (14) altogether, and resistance networking (26) are to place on the strip circuit board (not shown) with magnetic reed switch (28).The magnetic reed switch (28) of correspondence position in ball float (24) inner magnet (25) conducting liquid level detecting bar combination (23), can obtain a voltage signal that is directly proportional with ball float (24) position at the end (that is input end of first kind ratio/digital circuit change-over circuit (14)) that connects altogether of magnetic reed switch (28) based on the law of partial pressure, suppose its voltage=Vin.This voltage can be exchanged into the digital signal that is directly proportional with the ball float position through first kind ratio/digital conversion circuit (14), and the CPU (central processing unit) (15) of input rear end is treated to user's desired signal for user's utilization.
The formula that is calculated as follows (a) of Vin, Vin equal to import bias voltage Vbias take advantage of minimum point to arrive the resistance of ball float height (R * h) removes the total resistance in resistance networking (R * h), can get Vin through abbreviation and be proportional to ball float height h.
Wherein, Vbias, n are definite value (a)
So Vin ∝ h
But above-mentioned known technology is correct measurement liquid height position in the ordinary course of things, yet this circuit has a problem, when latch closure weathers or external force factor gets loose, after ball float (24) breaks away from the combination of liquid level detecting bar, all magnetic reed switchs (28) promptly are open-circuit condition, to cause the output signal instability of first kind ratio/digital conversion circuit (14), because of its input end is unsteady attitude (Floating), cause float-ball type liquid level measuring equipment output signal instability, can't reaction container groove (21) in liquid level to be measured (22) highly.Liquid mostly is transparent materials in general bucket groove (21) and the bucket groove, if not the liquid level detecting bar of liquid level gauge combination (23) whole extraction, can't determine whether ball float (24) breaks away from liquid level detecting bar combination (23).
Above-mentioned known technology also has another problem, the length of liquid level detecting bar combination (23) reaches several meters sometimes, therefore, strip circuit board (containing resistance networking (24) and magnetic reed switch (28)) in the liquid level detecting bar combination (23) must be formed by connecting by several pieces strip circuit boards, yet when the long longer pliability of bar heals high, in the process of transporting or in bucket groove (21) during liquid agitation, may cause the strip circuit board joint broken string in the liquid level detecting bar combination (23), make float-ball type liquid level measuring equipment complete failure.
The utility model content
Can't detect the problem of resistance networking joint broken string in bar combination of ball float disengaging liquid level detecting and the combination of liquid level detecting bar for solving known float-ball type liquid level measuring equipment, the float-ball type liquid level both sides device that the utility model provides a kind of ball float detected of detecting resistance networking broken string in bar combination of ball float disengaging liquid level detecting and the combination of liquid level detecting bar to come off.
Of the present utility modelly detect the float-ball type liquid level measuring equipment that ball float comes off and comprise:
The combination of one liquid level detecting bar, include strip circuit board, resistance networking, magnetic reed switch, strip circuit board bearing resistance networking and magnetic reed switch, the resistance networking is in series by an above resistance and forms, the DC voltage of one termination, first bias circuit output, the other end is connected to the reference ground of first bias circuit, and the tie point of every resistance connects a magnetic reed switch, and the other end of all magnetic reed switchs is connected to the input end of first kind ratio/digital conversion circuit altogether;
One ball float is placed in the combination of liquid level detecting bar, and in order to float on liquid level, ball float includes magnet, and the magnetic reed switch of correspondence position makes it to be short-circuit condition in making up in order to induction level detecting bar, makes the resistance networking produce the DC voltage that is directly proportional with liquid level to be measured;
One latch closure is fixed in liquid level detecting bar combination bottom, is used to avoid ball float to break away from the combination of liquid level detecting bar;
One first bias circuit in order to produce Dc bias, provides the bias voltage at liquid level detecting bar combination internal resistance networking;
One first kind ratio/digital conversion circuit, in order to measure the voltage of liquid level detecting bar combination internal resistance networking dividing potential drop via magnetic reed switch output, this voltage is directly proportional with liquid level to be measured, exports after this circuit conversion is digital signal;
One CPU (central processing unit) in order to the digital signal after the conversion of reception first kind ratio/digital conversion circuit, and is treated to the required signal of user;
One second bias circuit, in order to produce a big Dc bias of ratio first bias circuit, its output voltage is connected to ball float and breaks away from sense resistance;
One ball float breaks away from sense resistance, a termination second bias circuit, the input end of a termination first kind ratio/digital conversion circuit.
For further detecting the circuit board weld broken string in the combination of liquid level detecting bar, can in circuit, add:
One circuit breaking sense resistance, the one end is connected to the resistance networking, and the other end is connected to the reference ground of first bias circuit;
One second analogy/digital conversion circuit, its input end are the common contact at circuit breaking sense resistance and resistance networking, and the digital signal that converts exports CPU (central processing unit) to;
First bias circuit produces a direct current bias voltage and is connected to resistance networking one end in the combination of liquid level detecting bar.
In an embodiment of the present utility model, the output voltage of the second above-mentioned bias circuit is than big 1 millivolt to 30 of output voltage of first bias circuit volt.
In an embodiment of the present utility model, be built in CPU (central processing unit) in the above-mentioned first kind ratio/digital conversion circuit.
In an embodiment of the present utility model, be built in CPU (central processing unit) in the second above-mentioned analogy/digital conversion circuit.
Compared with prior art, the utility model has following advantage:
1, the utility model can be detected ball float and whether breaks away from liquid level detecting bar combination;
2, the utility model can detect whether resistance networking joint breaks in the combination of liquid level detecting bar.
Description of drawings
Fig. 1 is the functional block diagram of the utility model first embodiment;
Fig. 2 is the functional block diagram of the utility model second embodiment;
Fig. 3 is the functional block diagram of known float-ball type liquid level gauge.
Embodiment
Figure 1 shows that the utility model can detect first embodiment of the float-ball type liquid level measuring equipment that ball float comes off, it comprises that a ball float breaks away from sense resistance (11), one second bias circuit (12), one first bias circuit (13), the first kind a ratio/digital conversion circuit (14), a CPU (central processing unit) (15), a liquid level detecting bar and makes up (23), a ball float (24) and a latch closure (29).
Above-mentioned liquid level detecting bar combination (23), ball float (24), latch closure (29) is to fill in the bucket groove (21) of liquid level to be measured (22) with inserting one, the proportion of ball float (24) is less than testing liquid, therefore, ball float (24) may float on liquid level, ball float (24) includes the magnetic reed switch (28) of equal height in the combination of magnet (25) induction level detecting bar, first bias circuit (13) produces DC voltage feed flow position detecting bar combination (23) interior resistor network (26) dividing potential drop, branch pressure voltage and ball float (24) are highly proportional, input to first kind ratio/digital conversion circuit (14) and be converted to digital signal, CPU (central processing unit) (15) receives its digital signal and is treated to the required signal of user; When ball float (24) breaks away from liquid level detecting bar combination (23) scope, one second bias circuit (12) breaks away from the output voltage that sense resistance (11) can rise to the input voltage of first kind ratio/digital conversion circuit (14) second bias circuit (12) with a ball float, and because the voltage of second bias circuit (12) is greater than first bias circuit (13), the difference of two voltages is looked deviser's demand, its scope is between 1 millivolt to 30 volt, therefore, CPU (central processing unit) (15) breaks away from as long as the transformation result that senses first kind ratio/digital conversion circuit (14), is promptly represented ball float (24) greater than first bias circuit (13).
Fig. 2 can detect second embodiment of the float-ball type liquid level measuring equipment of ball float disengaging for the utility model, its basic framework and first embodiment are roughly the same, difference is being the strip circuit board weld broken string of further detecting in the liquid level detecting bar combination (23), in circuit, add a circuit breaking sense resistance (16) again, the one end is connected to resistance networking (26), and the other end is connected to circuit ground; And second an analogy/digital conversion circuit (17), its input end is a circuit breaking sense resistance (16) and the common contact at resistance networking (26), the digital signal that converts exports CPU (central processing unit) (15) to;
Arbitrary place's open circuit (broken string) in resistance networking (26), the input end of second analogy/digital conversion circuit (17) can obtain zero volt voltage, and be converted to digital signal and export CPU (central processing unit) (15) to, the output signal of detecting second analogy/digital conversion circuit (17) when CPU (central processing unit) (15) is zero volt, promptly represents resistance networking (26) broken string.
In the above embodiments, first kind ratio/digital conversion circuit (14) and second analogy/digital conversion circuit (17) all can in be built in the CPU (central processing unit) (15), the utility model does not specifically limit.
More than disclosed only be several specific embodiment of the present utility model, but the utility model is not limited thereto, any those skilled in the art can think variation, all should drop in the protection domain of the present utility model.
Claims (5)
1. can detect the float-ball type liquid level measuring equipment that ball float comes off for one kind, it is characterized in that, comprise:
The combination of one liquid level detecting bar, include strip circuit board, resistance networking, magnetic reed switch, strip circuit board bearing resistance networking and magnetic reed switch, the resistance networking is in series by an above resistance and forms, the DC voltage that one termination, first bias circuit produces, the other end are connected to the reference ground of first bias circuit; And connect a magnetic reed switch between every resistance, the other end of all magnetic reed switchs is connected to first kind ratio/digital conversion circuit input end altogether;
One ball float is placed in the combination of liquid level detecting bar, and in order to float on liquid level, ball float includes magnet, and the magnetic reed switch of correspondence position makes it to be short-circuit condition in making up in order to induction level detecting bar, makes the resistance networking produce the DC voltage that is directly proportional with liquid level;
One latch closure is fixed in liquid level detecting bar combination bottom, is used to avoid ball float to break away from the combination of liquid level detecting bar;
One first bias circuit in order to produce Dc bias, provides liquid level detecting bar combination internal resistance networking bias voltage;
One first kind ratio/digital conversion circuit, in order to output voltage after the dividing potential drop of measurement liquid level detecting bar combination internal resistance networking, this voltage is directly proportional with liquid level, exports after this circuit conversion is digital signal;
One CPU (central processing unit) in order to the digital signal after the conversion of reception first kind ratio/digital conversion circuit, and is treated to the required signal of user;
One second bias circuit, in order to produce a big Dc bias of ratio first bias circuit, its output voltage is connected to ball float and breaks away from sense resistance;
One ball float breaks away from sense resistance, a termination second bias circuit, the input end of a termination first kind ratio/digital conversion circuit.
2. as claimed in claim 1ly detect the float-ball type liquid level measuring equipment that ball float comes off, it is characterized in that, further comprise:
One circuit breaking sense resistance, the one end is connected to the resistance networking, and the other end is connected to the reference ground of first bias circuit;
One second analogy/digital conversion circuit, its input end are that the resistance networking is total to contact in circuit breaking sense resistance and the combination of liquid level detecting bar, and the digital signal that converts exports CPU (central processing unit) to;
First bias circuit produces a direct current bias voltage and is connected to resistance networking one end in the combination of liquid level detecting bar.
3. each describedly detects the float-ball type liquid level measuring equipment that ball float comes off as claim 1 to 2, it is characterized in that, the output voltage of described second bias circuit is than big 1 millivolt to 30 of output voltage of first bias circuit volt.
4. each describedly detects the float-ball type liquid level measuring equipment that ball float comes off as claim 1 to 2, it is characterized in that, is built in CPU (central processing unit) in the described first kind ratio/digital conversion circuit.
5. as claimed in claim 2ly detect the float-ball type liquid level measuring equipment that ball float comes off, it is characterized in that, be built in CPU (central processing unit) in described second analogy/digital conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202672886U CN201837439U (en) | 2010-05-06 | 2010-07-12 | Float ball type liquid level measuring device capable of detecting float ball falling |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020184915.X | 2010-05-06 | ||
| CN201020184915 | 2010-05-06 | ||
| CN2010202672886U CN201837439U (en) | 2010-05-06 | 2010-07-12 | Float ball type liquid level measuring device capable of detecting float ball falling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201837439U true CN201837439U (en) | 2011-05-18 |
Family
ID=44007548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202672886U Expired - Lifetime CN201837439U (en) | 2010-05-06 | 2010-07-12 | Float ball type liquid level measuring device capable of detecting float ball falling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201837439U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110849440A (en) * | 2019-12-03 | 2020-02-28 | 佛山金田申电子有限公司 | Liquid level detecting device for clamping pipe |
| CN114001795A (en) * | 2021-11-01 | 2022-02-01 | 国网北京市电力公司 | Liquid level monitoring method and device, computer readable medium and processor |
| CN114743357A (en) * | 2022-04-15 | 2022-07-12 | 中国科学院海洋研究所 | Water alarm probe and alarm device for water inlet alarm |
-
2010
- 2010-07-12 CN CN2010202672886U patent/CN201837439U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110849440A (en) * | 2019-12-03 | 2020-02-28 | 佛山金田申电子有限公司 | Liquid level detecting device for clamping pipe |
| CN114001795A (en) * | 2021-11-01 | 2022-02-01 | 国网北京市电力公司 | Liquid level monitoring method and device, computer readable medium and processor |
| CN114001795B (en) * | 2021-11-01 | 2023-11-03 | 国网北京市电力公司 | Liquid level monitoring method, liquid level monitoring device, computer readable medium and processor |
| CN114743357A (en) * | 2022-04-15 | 2022-07-12 | 中国科学院海洋研究所 | Water alarm probe and alarm device for water inlet alarm |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110518 |
|
| CX01 | Expiry of patent term |