JP3967768B1 - Liquid level detection display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid level detection display device in which a liquid level detection unit and a liquid level display unit are integrated.
A liquid level detection display device according to the present invention senses a magnet 18 attached to a float 17 by _n hall elements H _{1 to} H _n and includes a sensing signal indicating a sensing result and a data delimiter signal. A liquid level detection unit 100 that serially outputs a data signal, and a data processing unit 103 that generates liquid level display position data composed of a data separation signal and a liquid level display data signal based on the data signal from the liquid level detection unit 100. And a liquid surface position display unit 104 that receives the liquid surface display position data signal and displays the position of the liquid surface. The liquid surface position display unit 104 includes flip-flops E and Q that hold a data separation signal and a liquid surface display data signal, and a light emitting diode LED that emits light based on the data signal output from the flip-flop Q.
[Selection] Figure 6

Description

  The present invention relates to a liquid level detection display device that detects and displays a liquid level.

Conventionally, for example, a liquid level detection device shown in FIG. 12 has been proposed as a liquid level detection device used for measuring the liquid level of large tanks installed in various plants and the water level of dams, irrigation ponds, rivers, and the like. 12, the liquid level detecting device includes n Hall elements H ₁ to H _n to sense the position of the liquid surface, the Hall element H ₁ to H _n connected to the n pieces of flip-flops F ₁ to F _n The liquid level detecting unit 1200 having a shift register connected so as to be operated in order, and the liquid level detecting unit 1200 are controlled, and the position of the liquid level is determined based on the data signal from the shift register. A control unit 1201 for detecting and a display unit 1202 for displaying the position of the liquid level based on the position information of the liquid level output from the control unit 1201 are provided. The control unit 1201 includes a controller 1203 that controls the liquid level detection unit 1200, an oscillator 1204 that oscillates a pulse signal, and a counter 1205 that counts the pulse signal.

The operation of the liquid level detection device configured as described above will be described. In FIG. 12, the liquid level detection unit 1200 will be described below assuming that the Hall element H ₁ is positioned at the lowest level. The liquid level detection unit 1200 detects the position of the liquid level when each Hall element H _{1 to} H _n reacts with a magnet attached to a float that floats on the liquid level.

As a detection procedure, first, a reset signal is output from the controller 1203 of the control unit 1201 to each of the flip-flops F _{0 to} F _n . Thus, the flip-flops F ₀ to F _n is a non-operating state is reset. However, the flip-flop F _n is activated immediately after reset.

Next, a pulse signal is output from the oscillator 1204, and the counter 1205 starts counting the pulse signal. At this time, if the liquid level is not within the detectable range and all the Hall elements H _{1 to} H _n do not react to the magnetism of the magnet, the flip-flop F _n is in an activated state, so that other flip-flops F _{n-1 to} F ₀ are operated in order, and a count end signal is output to the controller 1203. The counter 1205 ends the count by receiving the count end signal via the controller 1203. The count value at this time is n + 1 because the flip-flop F ₀ to which the Hall element is not connected is provided.

On the other hand, when the liquid level is in the detectable range, for example, when the Hall element H ₃ outputs a sensing signal in response to the magnetism, it operates in order from the flip-flop F ₃ to which the sensing signal from the Hall element H ₃ is input. To do. That is, the flip-flop F ₃ is preset by the input of the sensing signal. For this reason, as shown in the timing chart of FIG. 13, the shift register of the liquid level detection unit 1200 starts from the flip-flop F ₃ and continues from the flip-flop F ₂ to the flip-flop F ₁ and the flop flop F ₀ . It operates in order and outputs a count end signal to the controller 1203. The counter 1205 ends the count by receiving the count end signal via the controller 1203. At this time, the count value is three.

The controller 1203 determines the position of the liquid level based on the value counted by the counter 1205, and outputs the determined position information to the display unit 1202. Then, the liquid level detection result is visually displayed on the display unit 1202.
Japanese Patent Application Laid-Open No. 2004-257763

  However, the liquid level detection device described in Patent Document 1 has a structure that detects the position of the liquid level by scanning the state of each water level electrode one by one. In addition, a switching element such as a transistor is required as an interface for scanning, and the wiring form becomes complicated. In addition, since all the water level electrodes are scanned one by one and fed back to the control unit each time, the processing circuit on the control unit side becomes complicated.

  Further, in the liquid level detection device of Patent Document 1, the liquid level detection unit 1200 and the display unit 1202 are separately controlled by the control unit 1201, and the liquid level detection unit 1200 and the display unit 1202 are integrated. Not. For this reason, in order to confirm whether the liquid level detection position matches the liquid level display position, a separate indicator is installed near the liquid level detection unit, etc. It was necessary to align.

  In addition, the liquid level detection device disclosed in Patent Document 1 does not include a means for detecting an abnormal transmission of display data from the control unit 1201 to the display unit 1202, so the liquid level position detected by the liquid level detection unit 1200 is It is not possible to confirm whether the display unit 1202 displays the information correctly.

  The present invention is for solving the above-described problems, and provides a liquid level detection display device that simplifies the circuit configuration of a liquid level detection unit and the configuration of a processing circuit of a control unit that controls the liquid level detection unit. With the goal. Moreover, it aims at providing the liquid level detection display apparatus which can integrate a liquid level detection part and a liquid level display part. It is another object of the present invention to provide a liquid level detection display device that can detect whether display data is normally transmitted to a display unit that displays a liquid level position.

  The liquid level detection display device according to the present invention includes a plurality of first liquid level detection units that are arranged on a straight line, detect a moving body that moves in accordance with a change in the position of the liquid level, and output a detection signal. A plurality of first flip-flops arranged in a straight line corresponding to each of the first liquid level sensing units and preset by a sensing signal from the corresponding liquid level sensing unit, and the first flip-flops And a first shift register in which one or more second flip-flops preset by a data delimiter signal are connected in series. The liquid level detection unit for serially outputting the output of the flip-flop of No. 2 from the shift register, and determining the liquid level position based on the serial output output from the shift register, A data processing unit that creates a liquid surface position display data signal including a data separation signal and a liquid surface display data signal for displaying the liquid surface position, and based on the liquid surface position display data signal output by the data processing unit A liquid level position display unit for displaying a liquid level position, the liquid level position display unit being arranged on a straight line and a plurality of light emitting elements arranged on a straight line and outputted from the data processing unit. A plurality of third flip-flops holding the liquid level display data signal, and one or more fourth flip-flops inserted and arranged at every predetermined number of the third flip-flops and holding the data delimiter signal Corresponding to each of the second shift register connected in series, the plurality of light emitting elements, and the plurality of third flip-flops, And a third shift register in which a plurality of fifth flip-flops that hold the liquid level display data signal from the third flip-flop and output to the corresponding light emitting element are connected in series. Features.

  Further, in the liquid level detection display device of the present invention, the data processing unit inputs the data signal output from the second shift register, and the liquid data output to the input data signal and the liquid level position display unit. The liquid surface position display data signal is compared, and based on the comparison result, transmission abnormality of the liquid surface position display data signal from the data processing unit to the liquid surface position display unit is detected.

  The liquid level detection display device of the present invention further includes an abnormality detection circuit for detecting an abnormality in transmission of the liquid level position display data signal from the data processing unit to the liquid level position display unit in the liquid level position display unit. A third shift register of the liquid surface position display unit is inserted and arranged every predetermined number of the plurality of fifth flip-flops and the fifth flip-flop, and the fourth flip-flop outputs One or more sixth flip-flops that hold a data delimiter signal and output to the abnormality detection circuit are connected in series, and the abnormality detection circuit receives an input from the sixth flip-flop. It is characterized in that it is detected whether the data delimiter signal matches the data delimiter signal included in the liquid surface position display data signal.

  Further, in the liquid level detection display device of the present invention, the first liquid level sensing unit connected to the first flip-flop disposed at one end of the first flip-flop row includes the first flip-flop row. Detects the passage of the moving body that has moved from one direction and continues to output a detection signal, and turns off the detection signal when the passage of the moving body that has moved from the opposite direction to the direction is detected. It is characterized by that.

  In addition, the liquid level detection display device of the present invention includes a second liquid level sensing unit disposed at one end of the row of the first liquid level sensing units, and the second liquid level sensing unit includes the first liquid level sensing unit. Detects the passage of the moving body that has moved from one direction of the liquid level sensing unit row and continuously outputs a detection signal to the data processing unit, and passes the moving body that has moved from the direction opposite to the direction. When the signal is detected, the detection signal is turned off.

  Further, in the liquid level detection display device of the present invention, the moving body is a magnet, and the first liquid level sensing unit outputs a sensing signal in response to the magnet moving in accordance with the position fluctuation of the liquid level. It is a conversion element.

  Further, in the liquid level detection display device of the present invention, the magnetic force of the magnet and the sensitivity of each of the magnetoelectric conversion elements are the distance between the magnet and each of the plurality of magnetoelectric conversion elements, and the adjacent magnetoelectric conversion of the plurality. Based on the spacing between the elements, when the magnet is positioned between the elements at both ends of the column of the magnetoelectric transducers, one or more of the magnetoelectric transducers always outputs a sensing signal under the action of the magnets. It is characterized by being selected.

  In the liquid level detection display device of the present invention, the magnetoelectric conversion element is a Hall element.

  According to the liquid level detection display device according to the present invention, in the liquid level detection display device that detects and displays the position of the liquid level, the movable body that is arranged on a straight line and moves according to the position variation of the liquid level is provided. A plurality of first liquid level sensing units that sense and output a sensing signal, and are arranged in a straight line corresponding to each of the plurality of first liquid level sensing units, from the corresponding liquid level sensing unit A plurality of first flip-flops preset by a sensing signal, and one or more second flip-flops inserted in a predetermined number of the first flip-flops and preset by a data delimiter signal are connected in series. A liquid level detection unit that serially outputs the preset outputs of the first and second flip-flops from the shift register, and the shift register. Data processing for determining a liquid surface position based on a serial output output from a register and creating a liquid surface position display data signal including the data separation signal and a liquid surface display data signal for displaying the liquid surface position And a liquid surface position display unit for displaying the liquid surface position based on the liquid surface position display data signal output from the data processing unit, and the liquid surface position display unit is arranged in a straight line. A plurality of light emitting elements, a plurality of third flip-flops arranged in a straight line and holding the liquid level display data signal output from the data processing unit, and inserted every predetermined number of the third flip-flops A second shift register that is arranged and connected in series with one or more fourth flip-flops that hold the data delimiter signal, the plurality of light emitting elements, and the plurality of the plurality of light emitting elements A plurality of fifth flip-flops arranged on a straight line corresponding to each of the three flip-flops, holding the liquid level display data signal from the corresponding third flip-flop and outputting it to the corresponding light emitting element And a third shift register in which the switches are connected in series.

  Thereby, compared with the conventional system which scans the state of a liquid level detection part one by one, the circuit structure of the data processing part which processes the data signal from a liquid level detection part can be simplified. Furthermore, since the state of the liquid level sensing unit is not scanned one by one, a switching element for that is not necessary, and the circuit configuration of the liquid level detection unit can be simplified.

  In addition, since the data processing unit can operate the liquid level detection unit and the liquid level position display unit using the same control signal, the liquid level detection unit and the liquid level position display unit can be integrated. . Therefore, when the liquid level position detected by the liquid level detection unit is displayed on the liquid level position display unit, a separate indicator is installed, and the detection position detected by the liquid level detection unit and the liquid level position display unit The operation of aligning with the liquid surface position displayed with can be omitted.

  According to the liquid level detection display device of the present invention, the data processing unit inputs a data signal output from the second shift register, and outputs the input data signal and the liquid level position display unit. Since the liquid level position display data signal is compared, it is possible to detect an abnormal transmission of the liquid level position display data signal from the data processing unit to the liquid level position display unit.

  Further, according to the liquid level detection display device of the present invention, an abnormality detection circuit for detecting an abnormal transmission of the liquid level position display data signal from the data processing unit to the liquid level position display unit in the liquid level position display unit. A third shift register of the liquid surface position display unit is inserted and arranged at every predetermined number of the plurality of fifth flip-flops and the fifth flip-flops, and the fourth flip-flops One or more sixth flip-flops that hold a data delimiter signal to be output and output to the abnormality detection circuit are connected in series, and the abnormality detection circuit includes the sixth flip-flop. It is detected whether the data delimiter signal input from 1 matches the data delimiter signal included in the liquid surface position display data signal. Thereby, simultaneously with the display of the liquid level position, it is possible to detect an abnormal transmission of the liquid level position display data signal from the data processing unit to the liquid level position display unit.

  Moreover, according to the liquid level detection display device of the present invention, the first liquid level sensing unit connected to the first flip-flop disposed at one end of the first flip-flop row includes the first level detection unit. When the passage of the moving body that has moved from one direction of the flip-flop row is detected and the detection signal is continuously output, and the passage of the moving body that has moved from the opposite direction to the direction is detected, the detection signal is Turn off. Thereby, it can be detected that the moving body has moved out of a detection range in which the liquid level detection unit can detect the moving body.

  Further, according to the liquid level detection display device of the present invention, the liquid level detection unit includes a second liquid level detection unit disposed at one end of the row of the first liquid level detection units, and the second liquid level detection unit includes: The moving body that has detected the passage of the moving body that has moved from one direction of the first liquid level sensing section and continuously outputs a detection signal to the data processing section, and has moved from the direction opposite to the direction. When the passage of is detected, the detection signal is turned off. Thereby, it can be detected that the moving body has moved out of a detection range in which the liquid level detection unit can detect the moving body. Furthermore, compared to the case where the first liquid level sensing unit connected to the first flip-flop disposed at one end of the first flip-flop row is used for detection of the passage of the moving body, the manufacturing is possible. Easy.

  According to the liquid level detection display device of the present invention, the moving body is a magnet, and the liquid level sensing unit outputs a sensing signal in response to a magnet that moves in accordance with the position fluctuation of the liquid level. And the magnetic force of the magnet and the sensitivity of each of the magnetoelectric conversion elements are based on the distance between the magnet and each of the plurality of magnetoelectric conversion elements, and the interval between adjacent ones of the plurality of magnetoelectric conversion elements, When the magnet is located between the elements at both ends of the row of the magnetoelectric transducers, one or more of the magnetoelectric transducers are selected to output a sensing signal under the action of the magnet. Thereby, the magnet which is a moving body can be detected with a predetermined number of magnetoelectric transducers. As a result, the sensitivity of each magnetoelectric conversion element can be detected based on whether or not a predetermined number of magnetoelectric conversion elements sense the magnet.

  According to the liquid level detection display device according to the present invention, since the magnetoelectric conversion element is a Hall element that is strong against mechanical stress, shock, and vibration and is inexpensive, the manufacturing cost of the liquid level detection unit is reduced. it can. Furthermore, since the Hall element is used as the magnetoelectric conversion element, the interval between the elements can be reduced, and the Hall element can be operated by the magnetic flux from one magnetic pole of the magnet. It can be detected with accuracy.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is a diagram illustrating a configuration example of a liquid level detection display device according to the first embodiment. As shown in FIG. 1, the liquid level detection display device according to the first embodiment includes a liquid level detection unit 100 that detects the position of the liquid level, a control unit 101 that controls the liquid level detection unit 100, and a liquid level. The display unit 102 displays information on the position of the liquid by numerical values, and the liquid level position display unit 104 displays the position of the liquid level by a light emitting element. The control unit 101 includes a data processing unit 103 that reads data from the liquid level detection unit 100, determines the position of the liquid level, and causes the display unit 102 and the liquid level position display unit 104 to display the position of the liquid level.

  The data processing unit 103 outputs a pulse signal and a reset signal for reading data from the liquid level detection unit 100, processes the read data signal to determine the position of the liquid level, and abnormalities in the liquid level detection unit 100 A function of performing detection, and a function of generating liquid surface position data from data output from the liquid surface detection unit 100 and outputting the data to the display unit 102 and the liquid surface position display unit 104 to display the position of the liquid surface. .

FIG. 2 is a diagram illustrating a configuration example of a liquid level detector to which the liquid level detection display device according to the first embodiment is applied. The liquid level detection unit 100 and the liquid level position display unit 104 of the liquid level detection display device according to the first embodiment are incorporated on a printed circuit board 12 accommodated in the liquid level detector 10. The liquid level detection unit 100 incorporated in the printed circuit board 12 is connected to the control unit 101 via input / output lines L _{1 to} L ₃ connected to the printed circuit board 12. Further, the liquid level position display unit 104 incorporated in the printed circuit board 12 is connected to the control unit 101 via input / output lines L ₁₃ , L ₁₇ , L ₁₈ , and L ₁₉ connected to the printed circuit board 12. Further, a light emitting diode (LED) 20 is disposed on the printed circuit board 12, and the LED 20 is turned on to display the position of the liquid level. As described above, in the present invention, the liquid level detection unit 100 and the liquid level position display unit 104 are incorporated on one printed circuit board 12 and accommodated in one housing.

  Here, the liquid level detector 10 is attached via an attachment band 16 to a stand pipe 11 that is closed at both ends by flanges 13 and provided with a flange 14 connected to the tank. The flanges 13 at both ends of the stand pipe 11 attach and detach the float 17. The flange 14 is provided at the tank connection port of the stand pipe 11. In the stand pipe 11, a float 17 that can move in the stand pipe is provided. A member to be sensed (here, a magnet 18) to be detected by the liquid level sensing unit 19 in the liquid level detection unit 100 is attached to the float 17. The float 17 moves along the stand pipe 11 between the flanges 13 as the liquid level changes.

  In the liquid level detector 10 configured as described above, since the float 17 moves along the stand pipe 11 in accordance with the position change of the liquid level, the sensed member provided in the float 17 also moves. By detecting the position of the member to be sensed by the surface detector 100, the position of the liquid surface can be detected. Further, the position of the sensed member detected by the liquid level detection unit 100 can be displayed by the LED 20 on the liquid level position display unit 104.

  Next, the configuration of the liquid level detection unit 100 will be described with reference to FIG. FIG. 3 is a diagram illustrating a configuration example of the liquid level detection unit 100.

  The liquid level detection unit 100 includes n liquid level detection units that detect the position of the liquid level, and a first shift resist that is configured to be connected so that a plurality of flip-flops are operated in order. This first shift register is connected so that a total of m + 1 flip-flops, that is, n flip-flops connected to the liquid level sensing unit and a plurality of flip-flops that input data delimiter signals, operate in a forward direction. Yes.

  Hereinafter, first, each liquid level detection unit of the liquid level detection unit 100 will be described. As the liquid level detection unit, any unit that can detect the position of the liquid level may be used, and a known unit using light, magnetism, ultrasonic waves, or the like can be used. However, position information suitable for digital processing is obtained. It is preferable to use a magnetoelectric conversion element that can be easily applied to the liquid level detector 10.

  Since the magnetoelectric conversion element outputs a sensing signal in response to magnetism, when the magnetoelectric conversion element is used as the liquid level sensing unit, a magnet 18 is attached to the float 17 as a sensed member as shown in FIG.

  Here, the magnetic force of the magnet 18 and the sensitivity of each magnetoelectric conversion element are always based on the distance between the magnet 18 and each magnetoelectric conversion element and the interval between each magnetoelectric conversion element. The sensor signal is selected so as to output a sensing signal. Thereby, the magnet 18 can be sensed by a predetermined number of magnetoelectric transducers.

  Examples of the magnetoelectric conversion element include a reed switch and a magnetoresistive element. FIG. 4 is a diagram illustrating a circuit configuration of the liquid level detection unit 100 when the reed switch RS is used as the liquid level detection unit. In this case, the reed switch RS is connected to the preset input terminal (PR bar) of the flip-flop F, and when the magnetism is sensed, that is, when the position of the liquid level is sensed, a sense signal is sent to the preset input terminal (PR bar). Is output.

  The liquid level detection unit of the present invention may be any unit that outputs a detection signal to the input terminal (PR bar) when the position of the liquid level is detected. A Hall element that is one of the conversion elements is particularly preferable. Unlike the reed switch, the Hall element does not have the disadvantage of being weak against mechanical stress, shock, and vibration, and is inexpensive, so that the manufacturing cost can be reduced by using the Hall element as a liquid level sensing unit. In addition, by using the Hall element, the liquid level detection unit 100 can be configured so that the Hall element is operated by the magnetic flux from the magnetic pole of one magnet by reducing the interval between the elements. It can be detected with accuracy.

In the first embodiment, a Hall element is used as the liquid level sensing unit for the above reason. Hereinafter, the configuration of the liquid level detection unit 100 when a Hall element is used as the liquid level detection unit will be described. The Hall elements H _{1 to} H _{n as the} liquid level sensing unit 19 are linearly arranged in a row along the longitudinal direction on the printed circuit board 12 of the liquid level detector 10 so as to respond to the magnet 18. Be placed. Each Hall element is connected to n flip-flops F, which will be described later, on a one-to-one basis. Each Hall element is connected to a corresponding flip-flop F via a preset input terminal (PR bar). When the magnet 18 is sensed, a sensing signal is output to the corresponding flip-flop F. The hall element outputs a signal indicating either “0” or “1” as a sensing signal.

In the first embodiment, as shown in FIG. 3, pull-up resistors R are provided in the hall elements H _{1 to} H _n . This is because if any of the Hall elements H _{1 to} H _n fails for some reason, the preset input terminal of the flip-flop F connected thereto becomes indefinite, and the flip-flop may not operate in a forward direction. It is provided in order to eliminate such problems. In other words, by providing the pull-up resistor R, even if any of the Hall elements H _{1 to} H _n fails, the flip-flop F connected to the Hall elements H _{1 to} H _n can be put into an operating state and operated in a forward manner.

Further, as the liquid level sensing unit, a pull-up resistor R is not attached externally by using a built-in pull-up resistor or a FET output type (voltage output type) instead of the Hall elements H _{1 to} H _n. However, it can be configured to perform the same function. The Hall element of the liquid level detection unit 100 of the present invention includes not only one that functions as a magnetic sensor for detecting the liquid level but also one with a built-in pull-up resistor.

Next, the first shift register of the liquid level detection unit 100 composed of a plurality of flip-flops will be described. In the first embodiment, the following description will be made with the flip-flop F ₀ as the bottom stage and the flip-flop F _m as the top stage. In the first embodiment, as shown in FIG. 3, the flip-flops constituting the first shift register are connected to the corresponding Hall elements (H _{1 to} H _n ) in a one-to-one relationship, and are arranged in a row of Hall elements. N first flip-flops (F _{1 to} F ₅ , F _{9 to} F ₁₃ , F _m−2 ) arranged along the predetermined number of first flip-flops, and a data delimiter signal One or more second flip-flops (F _{6 to} F ₈ , F _{14 to} F ₁₆ , F _m−1 , F _m ) and one end of the first flip-flop row, And a flip-flop F ₀ for inputting a signal.

A configuration example of the first flip-flop will be described with reference to FIGS. 3 and 5 by taking the flip-flops F _{1 to} F ₄ as an example. Each flip-prop is connected so that it can be operated forward. For example, connected to an output terminal Q of the preceding flip-flop F ₄ input terminal D of the flip-flop F ₃ via the output line L _9, an output terminal Q of the flip-flop F ₃ via the output line L ₈ is connected to the input terminal D of the subsequent flip-flop F _2, further flip-flop F ₂ is its output terminal Q is connected to an input terminal D of the subsequent flip-flop F ₁ through the input-output line L _7. Further, in each flip-flop, the clock input terminal CK is connected to the pulse signal output terminal T ₃ via the input / output line L ₆ , and the clear terminal (CLR bar) is connected to the reset signal output terminal T via the input / output line L _5. Connected to ₂ .

The second flip-flops F _{6 to} F ₈ and F _{14 to} F ₁₆ have preset input terminals (PR bars) connected to the ground or the power supply, and the flip-flops connected to the ground input the data delimiter signal “0”. The flip-flop connected to the power supply receives the data delimiter signal “1”. Further, the clock input terminal CK is connected to the pulse signal output terminal T ₃ via the input / output line L ₆ , and the clear terminal (CLR bar) is connected to the reset signal output terminal T ₂ via the input / output line L _5. Yes.

In addition, the second flip-flop F _m-1 has its preset input terminal (PR bar) connected to the power supply and inputs the data delimiter signal “1”. Further, the clock input terminal CK is connected to the pulse signal output terminal T ₃ via the input / output line L ₆ , and the clear terminal (CLR bar) is connected to the reset signal output terminal T ₂ via the input / output line L _5. Yes.

Further, the second flip-flop F _m has a preset input terminal (PR bar) and an input terminal D connected to the ground or a power source, and inputs a data delimiter signal. In FIG. 3, the preset input terminal (PR bar) is connected to the ground and the data delimiter signal “0” is input, and the input terminal D is connected to the power supply via the input / output line L ₁₀ and the data delimiter signal “0” is input. Enter “1”. Further, the second flip-flop F _m is connected to an input terminal D of the flip-flop F _m-1 and the output terminal Q via the output line L _11, the clock input terminal CK is through the input-output line L ₆ Te is connected to the pulse signal output terminal T _3, a clear terminal (CLR bar) is connected to the reset signal output terminal T ₂ via the output line L _5.

As described above, in the first embodiment, three second flip-flops (F _{6 to} F ₈ , F _{14 to} F ₁₆ ) are provided every predetermined number (here, 5) in the first flip-flop column. ) Is arranged, and two second flip-flops (F _m−1 , F _m ) are arranged on the uppermost side, but one or more second flip-flops are arranged in the first stage. What is necessary is just to insert and arrange every predetermined number of flip-flops. In FIG. 3, data delimiter signals “1”, “0”, and “1” are inserted for every five Hall elements. Therefore, in the liquid level detection unit 100, the data string of the data signal output from the shift register is the number of Hall elements in which “0” continues, regardless of the state of the sensing signal output from the Hall element. “1” does not last more than the number of consecutive Hall elements + 2. That is, in the data signal output from the shift register, 0 is 6 or more and 1 is not 8 or more. Thus, by providing the second flip-flop for inputting the data delimiter signal, the upper limit of the number of data having the same value is determined. For this reason, when a data signal having the same value larger than the upper limit is read, the data of the portion where the Hall element is not connected is being read, or the liquid level detection unit 100 is in a normal state. It can be detected by the data processing unit 103.

Further, the preset input terminal (PR bar) of the flip-flop F ₀ is connected to the ground or the power source, and receives a data delimiter signal. Although FIG. 1 shows the case where the preset input terminal (PR bar) is connected to the power source and the data delimiter signal “1” is input, the preset input terminal (PR bar) is connected to the ground and the data is input. A delimiter signal “0” may be input. In the lowest flip-flop F ₀ , the output terminal Q is connected to the data signal input terminal T ₁ via the input / output line L ₄ , and the clock input terminal CK is connected to the pulse signal output terminal via the input / output line L _6. The clear terminal (CLR bar) is connected to T ₃ and is connected to the reset signal output terminal T ₂ via the input / output line L ₅ .

As shown in FIG. 3, the bottom row of the flip-flop, may be arranged flip-flops F ₀ for inputting data delimiting signals, but in the liquid level detection unit 100 of the present invention, the flip-flop F ₀ Is not necessarily required. The case without the flip-flop F _0, since no lowermost data delimiter signal, continuous identical number of data readout range of the normal data is one less only the bottom.

  Here, the flip-flops arranged at one end of the row of flip-flops, that is, the flip-flops arranged at either the lowermost stage or the uppermost stage are preferably set so as to be activated immediately after reset. .

For example, when the uppermost flip-flop F _m is set so as to be activated immediately after resetting, the flip-flop even when all the Hall elements H _{1 to} H _n do not sense the position of the liquid level. since F _m is actuated state, data is output signal from the output terminal Q of the flip-flop F _m to the input terminal D of the flip-flop F _m-1, flip-flop F _m-1 is in operation. Even after the flip-flops F _{0 to} F _m are operated in order, when data is read, the value input from the input / output line L ₁₀ is continuously read.

Or constructed liquid level detecting unit 100 as is, according to a pulse signal S3 is output through the output line L ₆ from the data processing unit 103, and outputs the data signal S1 from the first shift register. Data string of the data signal S1, the data delimiter signals D _x (X is 1 or 0), the data signal which the Hall element is output when the H _n, the case of FIG. 1, in order from the flip-flop F ₀ of the lowermost _{, D 1, H 1, H} 2, H 3, H 4, H 5, D 1, D 0, D 1, H 6, H 7, H 8, H 9, H 10, D 1, D 0, D ₁ ,... H _n , D ₁ , D ₀ , D ₁ . In this way, the liquid level detection unit 100 serially outputs the signal from the Hall element and the data delimiter signal as the data signal S1 of one data string in accordance with the pulse signal S3.

Next, the data processing unit 103 for processing to input data signal S1 output from the liquid level detecting unit 100 from the data signal input terminal T ₁ will be described in detail. The data processing unit 103 stores in advance the position and interval of the data delimiter signal inserted into the data signal. For this reason, the data delimiter signal can be removed from the input data signal, the data string can be rearranged, and abnormality detection of the liquid level detection unit 100 can be performed. Then, the position of the Hall element that has output the sensing signal is determined from the rearranged data sequence, and the position data is output to the display unit 102. Accordingly, the position information of the liquid level detected by the Hall element can be displayed on the display unit 102 as a numerical value. Further, the data processing unit 103 can display not only the position of the liquid level but also the remaining amount of liquid from the position of the liquid level and display it on the display unit 102.

  Here, the magnetic force of the magnet 18 and the sensitivity of each Hall element are determined based on the distance between the magnet 18 and each Hall element and the interval between the Hall elements. When selected to output the sensing signal, the data processing unit 103 obtains a value according to a preset condition from the positions of the plurality of hall elements that sense the magnet 18, and uses the value as position data to display the display unit. To 102.

  Further, the data processing unit 103 stores the specific gravity of the liquid whose liquid level is measured in advance, corrects the positional deviation of the float due to the specific gravity of the liquid, and outputs the corrected value to the display unit 102 as position data. good.

Further, the data processing unit 103 determines the position of the Hall element that outputs the sensing signal from the rearranged data string. Thereafter, based on a preset display format, a liquid level display data signal obtained by adding a data delimiter signal to the liquid level display data signal for turning on the LED of the liquid level position display unit 104 is created. The data signal is output to the liquid surface position display unit 104 sequentially from the liquid surface position display data signal output terminal T ₄ . Examples of the display format set in advance include a format in which an LED arranged on the lower side from the center of a plurality of Hall elements in which magnetism is detected is turned on and an LED arranged on the upper side is turned off.

Next, a detailed configuration of the liquid surface position display unit 104 will be described with reference to FIG. The liquid surface position display unit 104 includes n LEDs (LED _{1 to} LED _n ) used as light emitting elements for displaying the liquid surface position, a second shift register including flip-flops E _{0 to} E _q, and a flip-flop. And a third shift register including G _{0 to} G _p . In the first embodiment, the following description will be made with the flip-flops E ₀ and G ₀ as the lowermost stage and the flip-flops E _q and _Gp as the uppermost stage.

The second shift register includes q flip-flops E _{0 to} E _{q obtained} by adding the number of LEDs (n) to the number of data delimiter signals included in the liquid surface position display data signal from the data processing unit 103. The liquid level position display data signal S4 output in the forward feed is received and connected so that it can operate in the forward feed. The second shift register holds third level flip-flops E _{1 to} E ₅ , E _{9 to} E ₁₃ , and E _q-2 that hold and output the liquid level display data signal, and every predetermined number of third flip-flops. The fourth flip-flops E _{6 to} E ₈ , E _{14 to} E ₁₆ , E _{q-1 to} E _q that hold and output the data delimiter signal and the flip-flop E ₀ that inputs the data delimiter signal With. Note that the flip-flop E ₀ can be omitted.

In the first embodiment, the liquid level detection unit 100 corresponds to the second flip-flops (F _{6 to} F ₈ , F _{14 to} F ₁₆ , F _m−1 , F _m ) that hold the data separation signal. Three fourth flip-flops (E _{6 to} E ₈ and E _{14 to} E ₁₆ ) are arranged in every third fifth flip-flop in the third flip-flop row, and are arranged on the uppermost stage side. Two fourth flip-flops (E _q−1 , E _q ) are arranged. In the present invention, the arrangement of the flip-flops E _{0 to} E _q is not limited to this, and can be arbitrarily changed according to the arrangement of the flip-flops F _{0 to} F _m of the liquid level detection unit 100.

The third shift register includes p flip-flops obtained by adding the number of data delimiter signals included in the liquid surface position display data signal to the number (n) of LEDs used as light emitting elements for liquid surface position display. Are connected to work forward. The third shift register holds fifth level flip-flops G _{1 to} G ₅ , G _{9 to} G ₁₃ , and G _q-2 that holds the liquid level display data signal and outputs it to the LED, and predetermined fifth flip-flops. Sixth flip-flops G _{6 to} G ₈ , G _{14 to} G ₁₆ , G _{q-1 to} G _q that are inserted and arranged every number, and that hold and output data delimiter signals, and flip-flops that input data delimiter signals G ₀ . Note that the flip-flop G ₀ can be omitted.

In the first embodiment, the liquid level detection unit 100 corresponds to the second flip-flops (F _{6 to} F ₈ , F _{14 to} F ₁₆ , F _m−1 , F _m ) that hold the data separation signal. Three sixth flip-flops (G ₆ -G ₈ , G ₁₄ -G ₁₆ ) are arranged in every fifth fifth flip-flop in the fifth flip-flop row, and are arranged on the uppermost stage side. Two sixth flip-flops (G _p−1 , E _p ) are arranged. In the present invention, the arrangement of the flip-flops G _{0 to} G _p is not limited to this, and can be arbitrarily changed according to the arrangement of the flip-flops F _{0 to} F _m of the liquid level detection unit 100.

The LEDs _{1 to} LED _n are lit based on the liquid level display data signals output from the flip-flops G _{1 to} G ₅ , G _{9 to} G ₁₃ , and _GP-2 . In the first embodiment, the LED is turned on when the liquid level display data signal “1” is input, and is turned off when the liquid level display data signal “0” is input.

  Details of the flip-flop E and the flip-flop G will be described below. FIG. 7 is a diagram illustrating a configuration example of the flip-flops E and G of the liquid surface position display unit 104.

The flip-flop E ₀ has an input terminal D connected to the liquid level display position data signal output terminal T ₄ via the input / output line L ₂₀ , and a clock input terminal CK connected to the pulse signal output terminal via the input / output line L _13. It is connected to the T _3. Further, the flip-flops E _{1 to} E _q-1 have their input terminals D connected to the output terminal Q of the preceding flip-flop E via the input / output line L _14, and the output terminal Q connects the input / output line L ₁₅ . To the input terminal D of the subsequent flip-flop E. The output terminal Q of the flip-flop E is connected to the input terminal D of the corresponding flip-flop G. The clock input terminal CK is connected to the pulse signal output terminal T ₃ via the input / output line L ₁₃ . Further, the output terminal Q of the flip-flop E _q is connected to the abnormality detection signal input terminal T ₅ . The flip-flops E _{0 to} E _q output the data signal input from the input terminal D to the subsequent flip-flop based on the pulse signal S3 input from the clock input terminal CK via the input / output line L ₁₃ . Thus, the liquid level position display data signal S4 from the data processing unit 103 is forward from the flip-flop E ₀ to the flip-flop E _q.

The output terminals Q of the flip-flops G _{1 to} G ₅ , G _{9 to} G ₁₃ , and G _q-2 are connected to the LED through the input / output line L ₁₆ . Further, the clock input terminal CK is connected to the reset signal output terminal T ₂ through the input / output line L ₁₇ . Then, a data set signal is input from the clock input terminal CK via the input / output line L _17, and the data signal is fetched and held from the corresponding flip-flop E via the input / output line L ₁₅ according to the data set signal, Output to the corresponding LED through the input / output line L ₁₆ . Here, the data set signal is the same as the reset signal S <b> 2 output to each flip-flop F of the liquid level detection unit 100.

The preset input terminals (PR bars) of the flip-flops E and Q are connected to the power source “1”. The clear terminal is connected to the power source “1” via the input / output line L ₁₂ . Thereby, the clear terminal (CLR bar) is not used, that is, clearing is not performed.

The operation of the liquid level detection display device according to the first embodiment configured as described above will be described with reference to FIG. For example, the liquid level detector 10 is installed in a tank equipped with liquid supply and drainage equipment so that the Hall element H ₁ as the liquid level sensing unit is positioned at the lowest level. When the liquid is supplied to the tank and the liquid level rises, the float 17 floating on the liquid surface rises along the stand pipe 11 accordingly. On the other hand, when the liquid is discharged from the tank and the liquid level is lowered, the float 17 is lowered along the stand pipe 11 accordingly. The liquid level detection unit 100 detects the position of the liquid level by causing the Hall elements H _{1 to} H _n to react with the magnetism of the magnet 18 provided in the float 17 that moves in the stand pipe 11 as the liquid level moves up and down. Can be detected.

As detection procedure, first, a reset signal S2 from the data processing unit 103 with respect to each of the flip-flops F ₀ to F _m is output. As a result, each of the flip-flops F _{0 to} F _m is reset and inactivated. However, the flip-flop F _m is activated immediately after reset.

Then, the output pulse signal S3 from the data processing unit 103, in accordance with the pulse signal S3, via the output line L ₁ from the first shift register, as a data signal S1, the holding of the lowermost flip-flop F ₀ From the data FD ₀ , the data up to the hold data FD _m of the uppermost flip-flop F _m is output. As a result, the data signal S1 including the output signal of the Hall element at the time of reset and the data delimiter signal is input to the data processing unit 103.

Data separator signals D _x (X is 1 or 0), the data signal which the Hall element outputs a H _n, the case of FIG. 1, data sequence, in order from the flip-flop F ₀ side, D _1, H _{1, H 2, H 3, H 4} , H 5, D 1, D 0, D 1, H 6, H 7, H 8, H 9, H 10, D 1, D 0, D 1, ··· H n , D ₁ , D ₀ , D ₁ . For example, in FIG. 1, when the Hall elements H _{2 to} H ₄ react to the magnet 18 to sense the liquid level and output the sensing signal “0”, the data string of the data signal is from the flip-flop F ₀ side. In order, 1, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1.

  Since the data processing unit 103 that inputs data as described above stores in advance the position and interval at which the data delimiter signal is inserted in the input data string, the position of the data delimiter signal in the read data signal is determined in advance. Anomaly detection by determining whether the number of data that is the same as the stored position exceeds the number of normal ranges, that is, 0 is 6 or more and 1 is 8 or more I do. Furthermore, the sensitivity of the Hall element is detected depending on whether a predetermined number (three in this case) of Hall elements is detected by the magnet. When an abnormality is detected, the data processing unit 103 outputs abnormality detection data for displaying the abnormality on the display unit 102.

Next, the data processing unit 103, the position where the data delimiter signal is inserted is predetermined, from the read data signal by removing the value of the data delimiting signals, in order from the flip-flop F ₁ side, H _{1, H 2, H 3, H 4} , H 5, H 6, H 7, H 8, H 9, H to obtain a data signal of the data string of ₁₀ · · · H _n. For example, when the hall elements H _{2 to} H ₄ sense the liquid level in response to the magnet 18 and output “0” as the sensing signal, the obtained data string is ₁ , 0 in order from the flip-flop F ₁ side. , 0, 0, 1, 1, 1, 1, 1, 1,. Since the data signal is sequentially output from the flip-flop F ₁ side according to the pulse signal from the first shift register, the position of the Hall element that senses the magnetism of the magnet 18 is detected by the data string, and the float 17 The position can be determined. Here, since the Hall elements H _{2 to} H ₄ sense the liquid level, the data processing unit 103 obtains values according to preset conditions from the positions of the Hall elements, and uses the values as position data. Is output to the display unit 102.

  The display unit 102 performs display based on the position data and abnormality detection data from the data processing unit 103. For example, the detection result of the liquid level is displayed as a numerical value based on the position data, or the abnormality of the liquid level detection unit 100 is displayed as a numerical value or a character based on the abnormality data.

Further, the data processing unit 103 creates a liquid level position display data signal based on the data signal input from the liquid level detection unit 100, and outputs it to the liquid level position display unit 104. The data processing unit 103, to reset the flip-flops F ₀ to F _m of the liquid level detection unit 100, the flip-flop E ₀ to E _q, such that the liquid level display data signal and a data delimiter signal is held The top level of the liquid surface position display unit 104, that is, the data delimiter signal (ED ₀ ) held in the flip-flop E ₀ in order from the data delimiter signal (ED _q ) held in the flip-flop E _q output from the data signal output terminal T _4.

The shift registers E _{0 to} E _q of the liquid surface position display unit 104 sequentially output the liquid surface position display data signal S 4 including the data separation signal and the liquid surface display data signal in accordance with the pulse signal S 3 output from the data processing unit 103. Data is received while being transferred from the lower flip-flop E ₀ to the uppermost flip-flop E _q .

All the flip-flops E, i.e., when the data is held until the flip-flop E ₀ to E _q, the flip-flop G is a data set signal S5 inputted from the reset signal output terminal T ₂ of the rising edge of the (reset signal S2) At the timing, the data from the flip-flop E is fetched and held and output to the corresponding LED. The reset signal input to each of the flip-flops F _{0 to} F _m of the liquid level detection unit 100 and the data set signal S5 input to the liquid level position display unit 104 use the same signal output from the data processing unit 103. Therefore, immediately after the resetting of the flip-flops F _{0 to} F _m , the data signals of the Hall elements H _{1 to} H _n are set in the flip-flops F _{0 to} F _m to be in an operating state, and the flip-flops G _{1 to} G _{5, G 8 ~G 13, G} p-2 is to hold the liquid level display data, and outputs the corresponding LED.

For example, the data processing unit 103 is a display method in which the magnetism of the magnet 18 is detected by the Hall elements H _{2 to} H ₄ of the liquid level detection unit 100 and the lower LEDs are turned on based on the position data of the plurality of Hall elements that have detected magnetism. Is set, the data processing unit 103 creates a liquid surface position display data signal so that the LEDs _{1 to 3} are lit, and outputs them to the liquid surface position display unit 104. In the first embodiment, since the LED is turned on by the data signal “1”, the data processing unit 103 outputs 0, 1, 0,... As liquid level position data signals to the flip-flops E _{0 to} E _q. 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1 are output to the liquid surface position display unit 104. As a result, the flip-flops G _{1 to} G ₃ hold the liquid level display data signal “1” and output it to the LEDs ₁ to LED ₃ , and the flip-flops G ₄ , G ₅ , G _{9 to} G ₁₃ display the liquid level display. The data signal “0” is held and output to LED ₄ to LED ₁₃ . The LEDs _{1 to 3} are turned on in response to the liquid level display data signal “1”, and the LEDs _{4 to 13} are turned off in response to the liquid level display data signal “0”.

  In this way, while the data processing unit 103 reads the data signal from the liquid level detection unit 100, the liquid level position display data signal created from the liquid level position already obtained is output to the liquid level position display unit 104, and the liquid level display unit 104 By repeatedly displaying the liquid surface position by the LED of the surface position display unit 104, the user can continuously recognize the liquid surface position variation with high accuracy.

The data processing unit 103 inputs the data signal S1 is serially outputted from the uppermost shift register E _q, the abnormality detection signal input terminal T ₅ via the output line L _19. That is, the data signal held in the flip-flops E _{0 to} E _q , that is, the liquid level position display data signal S 4 output to the liquid level position display unit 104 is input again via the shift register E _q . When the data signal output to the liquid surface position display unit 104 and the data signal input from the abnormality detection signal input terminal T ₅ are the same, and the two compared data signals do not match, the data processing unit 103 It is determined that an abnormality has occurred in the data transmission from the liquid level position display unit 104 to the liquid level position display unit 104. When the data processing unit 103 detects an abnormality, for example, all the LEDs of the liquid level position display unit 104 are turned off, turned on, or blinked to stop the use of the liquid level position display unit 104 or to make an external device Notify the occurrence of abnormalities.

  As described above, according to the liquid level detection display device according to the first embodiment, the liquid level detection unit 100 that senses the position of the liquid level and the data signal output from the liquid level detection unit 100 are processed, The data processing unit includes a data processing unit that generates a liquid surface position display data signal and a liquid surface position display unit 104 that displays the position of the liquid surface based on the liquid surface position display data signal from the data processing unit 103. Since the unit 103 outputs a pulse signal to the liquid level detection unit 100, information of all the liquid level detection units that sense the position of the liquid level can be read out as one data string, so that the liquid level detection unit The circuit configuration of the data processing unit 103 can be simplified as compared with the conventional method of scanning the states one by one. Further, since the state of the liquid level sensing unit is not scanned one by one, a switching element for that is not necessary, and the circuit configuration of the liquid level detection unit 100 can be simplified.

  Further, according to the liquid level detection display device according to the first embodiment, the liquid level detection unit 100 and the liquid level position display unit 104 are based on the same reset signal S2 and pulse signal S3 output from the data processing unit 103. Therefore, the liquid level detection unit 100 and the liquid level position display unit 104 can be integrated. Accordingly, when the liquid level position detected by the liquid level detection unit 100 is displayed on the liquid level position display unit 104, a separate indicator is installed, and the liquid level detection position detected by the liquid level detection unit 100 and the liquid level It is not necessary to align the liquid level display position displayed on the position display unit 104.

  Further, according to the liquid level position display device according to the first embodiment, the liquid level position display data signal output from the data processing unit 103 to the liquid level position display device 104 is input again from the liquid level position display device 104. By comparing the output data signal with the input data signal, it is possible to detect an abnormal transmission of data from the data processing unit 103 to the liquid surface position display unit 104 depending on whether or not the two compared data signals match. it can.

  Further, according to the liquid level detection display device according to the first embodiment, the data processing unit 103 creates the liquid level position display data signal S4 based on the data signal S1 input from the liquid level detection unit 100. From the above, since the display position of the liquid level by the liquid level position display unit 104 can be arbitrarily changed by the data processing unit 103, even if the specific gravity of the liquid changes and the draft position and the magnet position are shifted, The data processing unit 103 can correct the deviation between the liquid level detection position and the liquid level display position. As a result, there is no need to create a float in which the position of the magnet is adjusted for each liquid having a different specific gravity, or to install a separate indicator to align the liquid level detection position with the liquid level display position. It can handle multiple types of liquids with different specific gravities.

  In the first embodiment, the case where a magnetoelectric conversion element (Hall element) is used as the liquid level sensing unit has been described. However, the present invention is not limited to this. For example, the liquid level sensing unit may be an element that senses light or ultrasonic waves and outputs a sensing signal. In this case, a member that generates light or ultrasonic waves is attached to the float 17 as a sensed member.

In the first embodiment, the case where the data processing unit 103 inputs the data held in the flip-flops E _{0 to} E _q and performs abnormality detection has been described. However, the abnormality detection is not necessarily performed. When abnormality detection is not performed, the sixth flip-flops G _{6 to} G ₈ , G _{14 to} G ₁₆ , G _p−1 , and G _p can be omitted from the liquid surface position display unit 104.

In the case where abnormality detection is not performed, not only the sixth flip-flops G _{6 to} G ₈ , G _{14 to} G ₁₆ , G _p−1 and G _p but also the fourth flip-flops E _{6 to} E ₈ and E _{14 are used.} ˜E ₁₆ , E _q-1 , E _q may be omitted. In this case, the data processor 103 removes the data delimiter signal from the liquid surface position display data signal, delays the output timing by the number of clocks for the removed data, and outputs the liquid surface position display data signal.

In the first embodiment, the data signal is serially outputted from the flip-flop E _q, it has been described to be input from the abnormality detection signal input terminal T ₅ via the output line L ₁₉ to the data processing unit 103 As shown in FIG. 14, the data signal output terminal of the flip-flop E _q may be connected to the input terminal of the flip-flop F _m of the liquid level detection unit 100 via the input / output line L ₂₃ . The data transmission abnormality detection operation by the data processing unit 103 in this case will be described with reference to FIG. In order to confirm whether data is normally transmitted to the flip-flop E, the data processing unit 103 outputs a liquid level position display data signal S4 for detecting data transmission abnormality to the liquid level position display unit 104 while The data signal S1 is read from the surface detection unit 100 as the number (m) of flip-flops F as a data signal for creating liquid surface position display data. Thereafter, the liquid level position display data signal S4 for displaying the liquid level position is output to the liquid level position display unit 104 without outputting the data reset signal S5, and is output as the data signal S1 from the liquid level detection unit 100. A data transmission abnormality is detected by confirming whether or not the liquid surface position display data signal S4 for detecting the data transmission abnormality is normally read.

  In the first embodiment, the liquid level position information is displayed on the display unit 102. However, in the present invention, the display unit 102 is not necessarily required.

(Embodiment 2)
FIG. 9 is a diagram illustrating a configuration example of the liquid level position display unit 104 of the liquid level detection display device according to the second embodiment. The liquid level detection display device according to the second embodiment is characterized by including an abnormality detection circuit 105 in the liquid level position display unit 104. Hereinafter, the abnormality detection circuit 105 of the liquid surface position display unit 104 will be described with reference to FIG. Since other components are the same as those in the first embodiment, description thereof is omitted.

The liquid level position display unit 104 inputs data separation signals from the flip-flops G _{6 to} G ₈ , G _{14 to} G ₁₆ , G _p-1 , and G _p , and the liquid level position display unit 104 from the data processing unit 103. And an abnormality detection circuit 105 for detecting an abnormality in the transmission of the data signal. The abnormality detection circuit 105 includes e number of OR circuits U _{1 to} U _e and a light emitting diode LED ₀ .

Here, the pull-up resistor connected to the inputs of the OR circuits U _{1 to} U _e and the abnormality detection signal input terminal T ₅ is caused by a disconnection in which the output of the abnormality detection circuit 105 becomes “1” when the input / output line is disconnected. This is for detecting an abnormality and can be omitted as necessary.

Since the number and arrangement of data delimiter signals inserted into the data sequence of the liquid surface position display data signal by the data processing unit 103 are determined in advance, the number and arrangement of the OR circuits of the abnormality detection circuit 105 are determined accordingly. . The abnormality detection circuit 105 shown in FIG. 9 includes e OR circuits equal to the number of data delimiter signals included in the liquid level display position data signal, and the data processing unit 103 supplies the flip-flop G _p as a data delimiter signal. “0”, “1” in the flip-flop G _p−1 , “1” “0” “1” in the flip-flops G _{6 to} G _8, and “1” “0” in the flip-flops G _{14 to} G ₁₆ In this configuration, “1” is stored in the flip-flop G ₀ . The OR circuits U _{1 to} U _e output “0” when the data processing unit 103 inputs the data delimiter signal as inserted into the data string of the liquid surface position display data signal from the corresponding flip-flop G. ,It is configured.

The operation of the abnormality detection circuit 105 configured as described above will be described.
The data processing unit 103, the data separator signals as inserted into the liquid surface position display data signal is input flip-flop G _p, the _{G p-1, G 14 ~G} 16, G 6 ~G 8, G 0 The outputs of the OR circuits U _{1 to} U _e are “0”, and the LED ₀ is not lit. On the other hand, the flip-flops G _p , G _p-1 , G _{14 to} G ₁₆ , G _{6 to} G are used even if there is one signal different from the data delimiter signal inserted into the data string of the liquid level display data signal in the data processing unit 103. _{When the} signal is input to either ₈ or G ₀ , the output of the OR circuit U ₁ becomes “1” and the LED ₀ is lit.

The output of the OR circuit U ₁ is input to the abnormality detection signal input terminal T ₅ via the input / output line L ₂₁ and input to the data processing unit 103 via the input / output line L ₁₉ .

Based on the output of the OR circuit U ₁ , the data processing unit 103 detects a data transmission abnormality. When the abnormality is detected, for example, all the LEDs are turned off, lit, or blinked, and the liquid level position display unit 104 Is stopped, or an external device is notified of the occurrence of an abnormality.

According to the liquid surface position detecting apparatus according to the second embodiment as described above, the flip-flop _{G p, G p-1,} G 14 ~G 16, G 6 ~G 8, data separator held in the G ₀ Since the abnormality detection circuit 105 for detecting the transmission abnormality of the liquid surface position display data signal S4 from the data processing unit 103 to the liquid surface position display unit 104 based on the signal is provided, the liquid surface position is displayed simultaneously with the liquid surface position display. Transmission abnormality of the surface position display data signal S4 can be detected.

Further, the abnormality detection circuit 105 can notify the user of the occurrence of the abnormality because the LED ₀ is turned on when the abnormality occurs.

  In the second embodiment, the case where the abnormality detection circuit 105 is configured by a plurality of OR circuits has been described. However, the present invention is not limited to this, and other logic circuits (AND circuit, NOR circuit, etc.) The abnormality detection circuit 105 may be configured by a combination of an OR circuit and other logic circuits.

(Embodiment 3)
FIG. 10 is a diagram illustrating a configuration example of the liquid level detection display device according to the third embodiment.
The liquid level detection display device according to the third embodiment is connected to a flip-flop disposed at one end of the first flip-flop row of the liquid level detection unit 100 in place of the Hall element H, and passes through the magnet 18. This is different from the liquid level detection display device according to the first or second embodiment in that it includes a detection sensor that detects a signal and outputs a detection signal.

The liquid level detection unit 100 includes, for example, a storage switch M ₁ connected to the flip-flop F ₁ instead of the Hall element H ₁ as the detection sensor.

The memory switch M ₁ detects the passage of the magnet 18 that moves along the array of Hall elements, and outputs a detection signal to the flip-flop F ₁ . As shown in FIG. 2, the memory switch M ₁ is disposed on the printed circuit board 12 of the liquid level detector 10 (memory switch 15).

For example, when the memory switch M ₁ detects the passage of the magnet 18 moving from the lower stage side to the upper stage side and outputs the detection signal “0”, the memory switch M ₁ detects the passage of the magnet 18 moving from the upper stage side to the lower stage side. Until then, the detection signal “0” is continuously output. On the other hand, when the magnet moving from the upper stage side to the lower stage side passes, the detection signal “1” is output. Thereby, it can be determined by the memory switch M ₁ whether or not the magnet 18 attached to the float 17 has moved out of the lower limit range where the Hall elements H _{1 to} H _n can be magnetically detected.

The memory switch M ₁ detects the passage of the magnet moving from the lower stage side to the upper stage side, outputs the detection signal “1”, detects the passage of the magnet moving from the upper stage side to the lower stage side, and detects the detection signal. “0” may be output.

As the memory switch M ₁ that operates as described above, for example, a reed switch can be cited (NA Corporation website, http://www.na-web.co.jp/products/rs/pr-01 _- 16 _- see the html, search March 2006). This reed switch opens and closes in response to magnetism, and outputs a “0” signal when opened and a “1” signal when closed.

As described above, according to the liquid level detection display device according to the third embodiment, the magnet 18 attached to the float 17 can detect that the Hall element has moved out of the lower limit range where magnetic detection is possible. and to a storage switch M ₁ to be connected to the flip-flop F ₁ in place of the Hall element H _1. Thereby, it is not necessary to provide the stand pipe 11 with means for preventing the magnet 18 from moving outside the lower limit range of the magnetic detection.

The liquid level detection unit 100 of the liquid level detection display device according to the third embodiment can detect that the magnet 18 attached to the float 17 has moved out of the upper limit range where the Hall element can be magnetically detected. The memory switch M ₂ connected to the flip-flop F _m-2 may be provided instead of the Hall element H _n . For example, when the memory switch M ₂ detects the passage of the magnet 18 moving from the lower stage side to the upper stage side and outputs the detection signal “0”, the memory switch M ₂ detects the passage of the magnet 18 moving from the upper stage side to the lower stage side. Until then, the detection signal “0” is continuously output. When the magnet 18 moving from the upper stage side to the lower stage side passes, the detection signal “1” is output. Thereby, it can be detected by the memory switch M ₂ that the magnet 18 attached to the float 17 has moved out of the upper limit range in which the Hall elements H _{1 to} H _n can be magnetically detected. Therefore, it is not necessary to provide the stand pipe 11 with means for preventing the magnet 18 from moving outside the upper limit range of the magnetic detection.

Further, in order to detect that the magnet 18 attached to the float 17 has moved out of the upper and lower limits where the Hall element can be magnetically detected, a memory switch M ₁ is provided in the flip-flop F ₁ instead of the Hall element H _1. The memory switch M ₂ may be connected to the flip-flop F _m-2 instead of the Hall element H _n .

  In the third embodiment, a magnetoelectric conversion element (Hall element) is used as the liquid level sensing unit, and an element that outputs a signal in response to a magnet is used as the memory switch. Is not limited to this. For example, the liquid level sensing unit may be an element that senses light or ultrasonic waves and outputs a sensing signal. In this case, a member that generates light or ultrasonic waves is attached to the float 17 as the member to be sensed, and an element that detects passage of the member that generates light or ultrasonic waves is used as the memory switch.

(Embodiment 4)
FIG. 11 is a diagram illustrating a configuration example of the liquid level detection display device according to the fourth embodiment.
The liquid level detection display device according to the fourth embodiment is provided with a detection sensor that is connected to the data processing unit 103 at one end of the Hall element row and outputs a detection signal by detecting the passage of the magnet 18. Different from the liquid level detection display device according to the first or second embodiment.

Liquid level detection unit 100 is, for example, a storage switch M ₃ as the detection sensor. The storage switch M ₃ is the same as the storage switch M ₁ described in the third embodiment, but the connection method is different. The storage switch M ₃ is disposed on the lower side of the hall element H ₁ and is connected to the data processing unit 103 via the input / output line L ₂₂ . The detection signal output from the storage switch M ₃ is input to the data processing unit 103 from the storage switch signal input terminal T ₆ .

The memory switch M ₃ detects the passage of the magnet 18 that moves along the row of Hall elements, and outputs a detection signal to the data processing unit 103. As shown in FIG. 2, the storage switch M ₃ is disposed on the printed circuit board 12 of the liquid level detector 10 (storage switch 15).

For example, when the memory switch M ₃ detects the passage of the magnet 18 moving from the lower stage side to the upper stage side and outputs the detection signal “0”, the memory switch M ₃ detects the passage of the magnet 18 moving from the upper stage side to the lower stage side. Until then, the detection signal “0” is continuously output to the data processing unit 103. On the other hand, when a magnet moving from the upper stage side to the lower stage side passes, a detection signal “1” is output to the data processing unit 103.

Since the data processing unit 103 stores the position of the storage switch M ₃ in advance, the magnet 18 attached to the float 17 is connected to the Hall elements H _{1 to} H _n based on the detection signal from the storage switch M _3. It can be detected whether or not has moved out of the lower limit range where magnetism can be detected.

The memory switch M ₃ detects the passage of the magnet moving from the lower stage side to the upper stage side, outputs a detection signal “1”, detects the passage of the magnet moving from the upper stage side to the lower stage side, and detects the detection signal. “0” may be output.

As described above, according to the liquid level detection display device according to the fourth embodiment, the magnet 18 attached to the float 17 can detect that the Hall element has moved out of the lower limit range where magnetic detection is possible. A storage switch M ₃ connected to the data processing unit 103 is provided. Thereby, it is not necessary to provide the stand pipe 11 with means for preventing the magnet 18 from moving outside the lower limit range of the magnetic detection. Furthermore, compared to the case where one end of the Hall element is replaced with the memory switch M, the manufacture is easier.

In addition, the liquid level detection unit 100 of the liquid level detection display device according to the fourth embodiment can detect that the magnet 18 attached to the float 17 has moved out of the upper limit range where the Hall element can be magnetically detected. In addition, a storage switch M ₄ that is disposed on the upper side of the Hall element H _n and connected to the data processing unit 103 may be provided. For example, when the memory switch M ₄ detects the passage of the magnet 18 moving from the lower stage side to the upper stage side and outputs the detection signal “0”, the memory switch M ₄ detects the passage of the magnet 18 moving from the upper stage side to the lower stage side. Until then, the detection signal “0” is continuously output. When the magnet 18 moving from the upper stage side to the lower stage side passes, the detection signal “1” is output. Thereby, it can be detected by the memory switch M ₄ that the magnet 18 attached to the float 17 has moved out of the upper limit range in which the Hall elements H _{1 to} H _n can be magnetically detected. Therefore, it is not necessary to provide the stand pipe 11 with means for preventing the magnet 18 from moving outside the upper limit range of the magnetic detection.

Further, both the storage switch M ₃ and the storage switch M ₄ may be provided so that the magnet 18 attached to the float 17 can detect that the Hall element has moved out of the upper and lower limits where magnetic detection is possible.

  INDUSTRIAL APPLICABILITY The present invention is useful, for example, as a device for detecting a liquid level or a water level in a tank and detecting a water level such as a dam, a reservoir, a river or the like and displaying the liquid level or the water level.

It is a block diagram which shows the structure of the liquid level detection display apparatus which concerns on Embodiment 1-4 of this invention. It is a figure which shows one structural example of the liquid level detector to which the liquid level detection display apparatus which concerns on Embodiment 1-4 of this invention is applied. It is a figure which shows the example of 1 structure of the liquid level detection part of the liquid level detection display apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the example of 1 structure of the liquid level detection part of the liquid level detection display apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows one structural example of the flip-flop of the liquid level detection part of the liquid level detection display apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the example of 1 structure of the liquid level position display part of the liquid level detection display apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the example of 1 structure of the flip-flops E and G of the liquid level position display part of the liquid level detection display apparatus which concerns on Embodiment 1 of this invention. It is a figure for demonstrating operation | movement of the liquid level detection display apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the example of 1 structure of the liquid level position display part of the liquid level detection display apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows the example of 1 structure of the liquid level detection part of the liquid level detection display apparatus which concerns on Embodiment 3 of this invention. It is a figure which shows the example of 1 structure of the liquid level detection part of the liquid level detection display apparatus which concerns on Embodiment 4 of this invention. It is a block diagram of the conventional liquid level detection display apparatus. It is a figure for demonstrating operation | movement of the conventional liquid level detection display apparatus. It is a figure which shows the modification of the liquid level detection display apparatus which concerns on Embodiment 1 of this invention. It is a figure for demonstrating an example of the data transmission abnormality detection operation | movement by the liquid level detection display apparatus which concerns on Embodiment 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Liquid level detector 11 Stand pipe 12 Printed circuit board 13 Flange 14 Flange 15 Memory switch 16 Mounting band 17 Float 18 Magnet 19 Liquid level detection part 20 Light emitting diode 100, 1200 Liquid level detection part 101, 1201 Control part 102, 1202 Display part 103 Data processing unit 104 Liquid level display unit 105 Abnormality detection circuit 1203 Controller 1204 Oscillator 1205 Counter LED Light emitting diode E _{0 to} E _q Flip flop F _{0 to} F _m Flip flop G _{0 to} G _p Flip flop H _{1 to} H _n hole Elements L _{1 to} L _{23 I} / O lines M _{1 to} M ₄ Memory switch T ₁ Data signal input terminal T ₂ Reset signal output terminal T ₃ Pulse signal output terminal T ₄ Liquid level position display data signal output terminal T ₅ Abnormality detection signal input Terminal T ₆ memory switch signal input terminal

Claims (8)

In the liquid level detection display device that detects and displays the position of the liquid level,
Each of the plurality of first liquid level sensing units arranged on a straight line and sensing a moving body that moves as the liquid level changes and outputs a sensing signal, and each of the plurality of first liquid level sensing units Are arranged on a straight line corresponding to the plurality of first flip-flops preset by the corresponding sensing signal from the liquid level sensing unit, and inserted every predetermined number of the first flip-flops, and data A first shift register in which one or more second flip-flops preset by a delimiter signal are connected in series, and outputs the preset outputs of the first and second flip-flops to the shift A liquid level detector that outputs serial data from a register;
Based on the serial output output from the shift register, the liquid level position is determined, and a liquid level position display data signal including the data separation signal and a liquid level display data signal for displaying the liquid level position is created. A data processing unit;
A liquid level position display unit for displaying the liquid level position based on the liquid level position display data signal output by the data processing unit;
The liquid surface position display unit
A plurality of light emitting elements arranged in a straight line;
A plurality of third flip-flops arranged on a straight line and holding the liquid level display data signal output from the data processor, and inserted every predetermined number of the third flip-flops, the data delimiters A second shift register in which one or more fourth flip-flops holding a signal are connected in series;
Corresponding to each of the plurality of light emitting elements and the plurality of third flip-flops, the liquid level display data signals from the corresponding third flip-flops are held and correspond to each other. A third shift register in which a plurality of fifth flip-flops output to the light emitting element are connected in series;
A liquid level detection display device. In the liquid level detection display device according to claim 1,
The data processing unit inputs a data signal output from the second shift register, compares the input data signal with the liquid surface position display data signal output to the liquid surface position display unit, and compares Based on the result, the transmission abnormality of the liquid surface position display data signal from the data processing unit to the liquid surface position display unit is detected.
A liquid level detection display device. In the liquid level detection display device according to claim 1,
The liquid surface position display unit further includes an abnormality detection circuit that detects a transmission abnormality of the liquid surface position display data signal from the data processing unit to the liquid surface position display unit,
A third shift register of the liquid surface position display unit is arranged to be inserted every predetermined number of the plurality of fifth flip-flops and the fifth flip-flops, and the data delimiter output by the fourth flip-flops One or more sixth flip-flops that hold a signal and output to the abnormality detection circuit are connected in series,
The abnormality detection circuit detects whether or not a data break signal input from the sixth flip-flop matches a data break signal included in the liquid surface position display data signal;
A liquid level detection display device. In the liquid level detection display apparatus in any one of Claims 1-3,
The first liquid level sensing unit connected to the first flip-flop arranged at one end of the first flip-flop row passes through the moving body that has moved from one direction of the first flip-flop row. , And continues to output the detection signal, and when the passage of the moving body that has moved from the direction opposite to the direction is detected, the detection signal is turned off.
A liquid level detection display device. In the liquid level detection display apparatus in any one of Claims 1-3,
A second liquid level sensor disposed at one end of the row of the first liquid level sensors;
The second liquid level sensing unit detects the passage of the moving body that has moved from one direction of the first liquid level sensing unit row and continues to output a detection signal to the data processing unit. Turns off the detection signal when it detects the passage of the moving body moving from the opposite direction,
A liquid level detection display device. In the liquid level detection display apparatus in any one of Claims 1-5,
The moving body is a magnet;
The first liquid level sensing unit is a magnetoelectric conversion element that outputs a sensing signal in response to a magnet that moves as the liquid level changes.
A liquid level detection display device. In the liquid level detection display device according to claim 6,
The magnetic force of the magnet and the sensitivity of each of the magnetoelectric conversion elements are determined based on the distance between the magnet and each of the plurality of magnetoelectric conversion elements and the spacing between adjacent ones of the plurality of magnetoelectric conversion elements. When positioned between the elements at both ends of the row of magnetoelectric transducers, one or more of the magnetoelectric transducers are selected to output a sensing signal under the action of the magnet.
A liquid level detection display device. In the liquid level detection display device according to claim 6,
The magnetoelectric conversion element is a Hall element.
A liquid level detection display device.

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