WO2018001155A1 - Dispositif de détection de niveau de liquide et procédé de détection de niveau de liquide - Google Patents

Dispositif de détection de niveau de liquide et procédé de détection de niveau de liquide Download PDF

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Publication number
WO2018001155A1
WO2018001155A1 PCT/CN2017/089493 CN2017089493W WO2018001155A1 WO 2018001155 A1 WO2018001155 A1 WO 2018001155A1 CN 2017089493 W CN2017089493 W CN 2017089493W WO 2018001155 A1 WO2018001155 A1 WO 2018001155A1
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WO
WIPO (PCT)
Prior art keywords
liquid level
change information
level measuring
float
total resistance
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PCT/CN2017/089493
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English (en)
Chinese (zh)
Inventor
和明
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珠海格力智能装备有限公司
珠海格力电器股份有限公司
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Publication of WO2018001155A1 publication Critical patent/WO2018001155A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats

Definitions

  • the invention belongs to the technical field of sensor detection, and particularly relates to a liquid level sensing device and a liquid level detecting method.
  • the float switch operates using a magnetic force.
  • the float switch When the float switch is floated by the medium to be tested, the float moves the main body, and the magnet at the other end of the float moves the magnet switch on the control rod.
  • various liquid tanks such as petroleum, chemical raw material storage, biochemical, medicine, food and beverage, and underground filling of gas stations.
  • the resistance of the entire switch is changed by the upper and lower floating of the floating rod of the floating ball, thereby causing a change in the resistance value of the entire switch, and the combination change of the liquid level switch by the single-chip AD conversion is performed, thereby obtaining the change of the liquid level of the container, but They use the same kind of resistance, although the purpose of liquid level detection can be achieved, but when one of the floats fails to lose buoyancy, it will be inaccurate.
  • the internal resistances of the first float ball 108, the second float ball 106, the third float ball 104, and the fourth float ball 102 are all the same.
  • the total resistance of the first floating ball 108, the third floating ball 104, and the fourth floating ball 102 is equivalent to the original first floating ball 108, the second floating ball 106, and the third.
  • the total resistance of the float 104 floats, which will cause measurement errors.
  • the object of the present invention is to provide a liquid level sensing device and a liquid level detecting method for solving the above defects, so as to solve the problem that the resistance of each floating ball in the prior art is the same, and the measurement is inaccurate when any floating ball is damaged.
  • the problem is to achieve good measurement accuracy.
  • the present invention provides a liquid level sensing device, comprising: a plurality of liquid level measuring units; the plurality of liquid level measuring units are sequentially connected and constitute a measuring circuit, and are used for realizing multi-segment measurement of the liquid level to be tested;
  • Each liquid level measuring unit includes: a resistor and a switch, wherein the resistor is connected in parallel with the switch; and the resistance values of the resistors in the plurality of liquid level measuring units are different, so that the liquid level is measured by different liquid level measuring units The total resistance of the total resistance of the sensing device is different.
  • the method further includes: a voltage dividing unit; the voltage dividing unit is adapted to the plurality of liquid level measuring units
  • the setting is configured to perform partial pressure protection on the measuring circuit in the form of providing a voltage dividing resistor when the total resistance value when the plurality of liquid level measuring units are measured is the smallest.
  • the controller further includes: the controller, and the plurality of liquid level measuring units are configured to acquire total resistance change information of the total resistance of the plurality of liquid level measuring units, and The liquid level change information of the liquid level to be tested is determined according to the total resistance change information.
  • the controller is further configured to compare the total resistance change information with all the resistance change information when the pre-stored plurality of liquid level measuring units are normal, when the total resistance value changes When the information is different from the pre-stored all the resistance change information, the fault state in which the plurality of liquid level measuring units have failed is determined.
  • the controller includes: at least one of an MCU, a single chip microcomputer, a DSP processor, and a PLC.
  • the method further includes: a display unit; the display unit is adapted to be configured by the controller, configured to perform at least one of the total resistance change information, the liquid level change information, and the fault state Outputting and/or displaying, and/or alerting the fault condition.
  • each liquid level measuring unit includes: a float liquid level measuring unit; correspondingly, the electric resistance includes: a floating ball internal resistance of the float liquid level measuring unit; the switch includes: The float valve of the float level measuring unit.
  • the resistance values of the resistances in the plurality of liquid level measuring units are sequentially set in an order of increasing or decreasing sequentially; and/or, the plurality of liquid level measuring units, including: the first liquid The position measuring unit, the second liquid level measuring unit, the third liquid level measuring unit and the fourth liquid level measuring unit.
  • another aspect of the present invention provides a liquid level detecting method comprising: performing a segment measurement on the liquid level to be tested using the liquid level sensing device described above.
  • performing the segment measurement on the liquid level to be tested including: acquiring total resistance change information of the total resistance of the plurality of liquid level measuring units; determining the to-be-tested according to the total resistance change information Level change information of the liquid level.
  • performing the segment measurement on the liquid level to be tested further comprising: comparing the total resistance change information with all the resistance change information of the pre-stored plurality of liquid level measurement units; When the total resistance change information is different from the pre-stored all the resistance change information, it is determined that the plurality of liquid level measuring units have failed.
  • performing the segment measurement on the liquid level to be tested further comprising: outputting and/or displaying at least one of the total resistance change information, the liquid level change information, and the fault state, And/or, alerting the fault condition.
  • the resistances controlled by the respective float balls are set to different resistance values, and the total resistance values of the sensors are different when different float balls are floated, and the single-chip system can distinguish whether the floating ball floats normally or not.
  • the float level sensor when the float is broken, causes the liquid level measurement error, thereby improving the accuracy of the liquid level detection.
  • the resistance values of the respective floating ball joints are set to different resistance values, so that different floating balls float to form different resistance values, and the single-chip system can cooperate to identify the fault state and complete the floating ball.
  • the self-test function of the liquid level sensor based on the identified fault status, an alarm can be triggered to remind the user to replace the sensor, thereby improving the reliability of the liquid level detection and the user experience.
  • the utility model overcomes the defects of poor measurement accuracy, low reliability and high maintenance difficulty in the prior art, and achieves the beneficial effects of good measurement accuracy, high reliability and small maintenance difficulty.
  • FIG. 1 is a schematic structural view of a conventional float liquid level sensor
  • FIG. 2 is a schematic structural view of an embodiment of an internal circuit of a liquid level sensing device of the present invention
  • FIG. 3 is a flow chart of an embodiment of a liquid level detecting method of the present invention.
  • FIG. 4 is a flow chart of an embodiment of identifying a fault condition in the method of the present invention.
  • FIG. 5 is a schematic diagram showing the working principle of the voltage detecting circuit of the present invention.
  • 200-partial pressure unit 202-first liquid level measuring unit; 204-second liquid level measuring unit; 206-third liquid level measuring unit; 208-fourth liquid level measuring unit.
  • FIG. 2 is a schematic structural view of an embodiment of an internal circuit of a liquid level sensing device of the present invention.
  • the liquid level sensing device may include a plurality of liquid level measuring units.
  • the plurality of liquid level measuring units are sequentially connected and constitute a measuring loop, and are used to implement a plurality of measurements of the liquid level to be tested.
  • each liquid level measuring unit comprises: a resistor and a switch, the resistor being connected in parallel with the switch.
  • the resistance values of the resistors in the plurality of liquid level measuring units are different, so that the total resistance of the total resistance of the liquid level sensing device is different when different liquid level measuring units are measured.
  • the respective resistance values of the float level sensor are set to different resistance values.
  • the resistance of each float control is set to a different resistance value, and the total resistance value of the sensor is different when different floats are floated.
  • each float joint is set to a different resistance value, so that different float floats will form different resistance values.
  • the resistance values of the first float 108, the second float 106, the third float 104, and the fourth float 102 in the example shown in FIG. 1 are set to 100 ⁇ , 300 ⁇ , 500 ⁇ , and 1000 ⁇ , respectively.
  • the total resistance of the first floating ball 108 and the third floating ball 104 is not equal to the total resistance of the first floating ball 108 and the second floating ball 106. It is not equal to the total resistance of the first float ball 108, the second float ball 106, and the third float ball 104, nor is it equal to the first float ball 108, the second float ball 106, the third float ball 104, and the fourth float.
  • the total resistance of the ball 102 floating By analogy, when any one of the float balls (for example, the first float ball 108, the second float ball 106, the third float ball 104, and the fourth float ball 102) fails, the corresponding detection result and The detection structure of any of the normal conditions is different.
  • the float balls for example, the first float ball 108, the second float ball 106, the third float ball 104, and the fourth float ball 102
  • the resistance values of the resistances in the plurality of liquid level measuring units are set to be different, so that the control of different resistances is performed.
  • the switch is closed, the total resistance value of the whole measuring circuit is different, so that the measurement error can be reduced; and the fault state of the plurality of liquid level measuring units can be identified, and the maintenance is timely, which is beneficial to improve the reliability of the work of the plurality of liquid level measuring units. Sex.
  • the plurality of liquid level measuring units include: a first liquid level measuring unit 202, a second liquid level measuring unit 204, a third liquid level measuring unit 206, and a fourth liquid level measuring unit 208.
  • the number of liquid level measuring units (for example, the liquid level measuring unit including the floating ball) can be freely increased or decreased according to actual needs, so as to be convenient to use.
  • a liquid level sensing device having four measuring positions can be constructed, which facilitates universal liquid level measurement, is convenient to use, and has high reliability.
  • each liquid level measuring unit may include: a float liquid level measuring unit.
  • the resistor comprises: a floating ball internal resistance of the float liquid level measuring unit; and the switch comprises: a floating ball valve of the float liquid level measuring unit.
  • the float level liquid level sensing unit can be configured by the float liquid level measuring unit, and has high versatility and good usability.
  • the resistance values of the resistances in the plurality of liquid level measuring units are sequentially set in an order of increasing or decreasing sequentially.
  • the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 may be arranged in order of resistance from large to small or from small to large. arrangement.
  • the arrangement of the plurality of liquid level measuring units in the order that the resistance value is gradually increased or the resistance value is gradually decreasing, the measurement of the gradual change of the liquid level can be better realized, and the measurement accuracy is better.
  • the pressure dividing unit 200 may further be included.
  • the voltage dividing unit 200 is adapted to be configured with the plurality of liquid level measuring units for providing a voltage dividing resistor when the total resistance value when the plurality of liquid level measuring units are measured is minimum. The form of the measurement circuit is divided and protected.
  • the voltage dividing unit 200 may include a fifth resistor R5, and participate in the example shown in FIG. 2.
  • an external partial resistor can also be set. Because, if no external partial resistor is set, the entire circuit will be in a short circuit.
  • the voltage dividing unit can protect the measuring circuit when the control switches of the plurality of liquid level measuring units are closed, thereby ensuring the safety of the liquid level sensing device, and the humanization is good and the practicability is strong.
  • the controller may further include: a controller.
  • the controller is adapted to be configured with the plurality of liquid level measuring units, and may be configured to acquire total resistance change information of the total resistance of the plurality of liquid level measuring units, and according to the total The resistance change information determines the liquid level change information of the liquid level to be tested.
  • the liquid level reaches the third float position, the first float ball, the second float ball and the third float ball float, that is, the first switch A1 is closed, the second switch A2 is closed, and the third switch A3 is closed, the liquid level is closed.
  • the liquid level reaches the fourth floating ball position
  • the first floating ball, the second floating ball, the third floating ball and the fourth floating ball both float, that is, the first switch A1 is closed, the second switch A2, the third is
  • the switch A3 is closed and the fourth switch A4 is closed
  • the total resistance value of the sensor ie, the liquid level sensing device
  • the change in liquid level can be detected by acquiring the resistance of the sensor through the microcontroller system. For example, by calculating the voltage input by the AD port of the single chip, the corresponding liquid level information is obtained.
  • the measurement process of the liquid level sensing device may include:
  • AD is converted to digital for program judgment.
  • the voltage values other than this are abnormal.
  • the corresponding liquid level change information is calculated according to the total resistance change information of the resistance in the plurality of liquid level measuring units, the measuring method is simple, and the measurement result is accurate.
  • the controller may be further configured to compare the total resistance change information with all the resistance change information when the pre-stored plurality of liquid level measuring units are normal, when When the total resistance change information is different from the pre-stored all the resistance change information, the fault state in which the plurality of liquid level measuring units have failed is determined.
  • the fault self-test function of the sensor can be completed by using the single-chip system, which can solve the liquid level measurement error caused by the float liquid level sensor when the float ball is broken.
  • using a single-chip system can distinguish whether the floating float is normal.
  • the controller may include at least one of an MCU, a single chip microcomputer, a DSP processor, and a PLC.
  • the display unit may further include: a display unit.
  • the display unit is adapted to be configured to output, and/or output, at least one of the total resistance change information, the liquid level change information, and the fault state. Or display, and/or, alert the fault condition.
  • the display unit may include: a display screen, an alarm, an output interface, a communication module, and the like.
  • an alarm can be triggered to alert the user to replace the sensor.
  • the resistances of the respective float balls are set to different resistance values, and the total resistance values of the sensors are different when different float balls are floated, and the single chip system can be used. It is normal whether the float float is normal, and the liquid level measurement error caused by the float liquid level sensor when the float ball is broken is solved, thereby improving the accuracy of the liquid level detection.
  • a liquid level detecting method corresponding to a liquid level sensing device is also provided.
  • the liquid level detecting method may include: performing a segment measurement on the liquid level to be tested using the liquid level sensing device described above.
  • performing the segment measurement on the liquid level to be tested may include: determining liquid level change information of the liquid level to be tested according to the obtained total resistance change information.
  • Step S110 acquiring total resistance change information of the total resistance of the plurality of liquid level measuring units.
  • Step S120 determining liquid level change information of the liquid level to be tested according to the total resistance change information.
  • the corresponding liquid level change information is calculated according to the total resistance change information of the resistance in the plurality of liquid level measuring units, the measuring method is simple, and the measurement result is accurate.
  • performing the segment measurement on the liquid level to be tested may further include: identifying, according to the obtained total resistance change information, whether the plurality of liquid level measurement units are in a fault state.
  • Step S210 comparing the total resistance change information with all the resistance change information when the pre-stored plurality of liquid level measuring units are normal.
  • Step S220 When the total resistance change information is different from the pre-stored all resistance change information, determine that the plurality of liquid level measuring units have failed.
  • performing the segment measurement on the liquid level to be tested may further include: performing output, display, alarm, and the like on the corresponding information obtained by the detection.
  • At least one of the total resistance change information, the liquid level change information, the fault condition may be output and/or displayed, and/or the fault condition may be alerted.
  • the alarm signal of the single chip microcomputer can be triggered.
  • the resistance of each float control can be set to a different resistance based on the example shown in FIG.
  • the resistance values of the first float ball 108, the second float ball 106, the third float ball 104, and the fourth float ball 102 are set to 100 ⁇ , 300 ⁇ , 500 ⁇ , and 1000 ⁇ , respectively.
  • the total resistance of the fourth floating ball 102 and the second floating ball 106 is not equal to the total resistance of the fourth floating ball 102 and the third floating ball 104, and is not equal to The total resistance of the fourth float ball 102, the third float ball 104, and the second float ball 106 is not equal to the fourth float ball 102, the third float ball 104, the second float ball 106, and the first float ball 108.
  • the total resistance of the float is not equal to the fourth float ball 102, the third float ball 104, the second float ball 106, and the first float ball 108.
  • any one of the float balls (for example, the fourth float ball 102, the third float ball 104, the second float ball 106, and the first float ball 108) fails, the corresponding detection result and The detection structure of any one of the normal conditions is different, so that the alarm signal of the single chip microcomputer can be triggered.
  • each resistor is preferably arranged in order of resistance from large to small or from small to large.
  • the entire circuit resistance is basically zero. If there is no fifth resistor R5, the voltage on the detection circuit will be small, which is inconvenient to detect.
  • no external partial pressure resistor for example, an external partial pressure resistor, it may be disposed in a voltage detecting circuit adapted to the liquid level sensing device, and the resistance value of the external partial pressure resistor may be taken as the sensing device.
  • the total resistance is about 1/4, of which 1/4 is the most reasonable, and the whole circuit will be in a short circuit.
  • Figure 5 can show the operation of the voltage detection circuit.
  • the voltage detecting circuit includes a sensing device 302, a controller 304, and a signal processing module.
  • the signal processing module is connected to the sensing device 302 and the controller 304, respectively.
  • the signal processing module can be connected to the external float liquid level detecting switch of the sensing device 302.
  • the signal processing module may include: a voltage dividing resistor (for example, a voltage dividing resistor R97, etc.), a filter capacitor (for example, a filter capacitor C70, a filter capacitor C72, a filter capacitor C96, etc.), and a filter resistor (for example, a filter resistor R99). )Wait.
  • a voltage dividing resistor for example, a voltage dividing resistor R97, etc.
  • a filter capacitor for example, a filter capacitor C70, a filter capacitor C72, a filter capacitor C96, etc.
  • a filter resistor for example, a filter resistor R99.
  • the internal circuit diagram of the liquid level sensor is shown in Figure 2.
  • the first switch A1, the second switch A2, the third switch A3 and the fourth switch A4 are all disconnected, so that the entire sensor (ie The liquid level sensing device has a resistance value of up to 2210 ⁇ .
  • the total resistance of the sensor floating on the A4 float ie, the liquid level sensing device
  • the liquid level sensing device When the liquid level reaches the third float position, the A3 float and the A4 float float, and the total resistance of the sensor (ie, the liquid level sensing device) becomes 700 ⁇ .
  • the total resistance value of the liquid level sensing device becomes 370 ⁇ .
  • the A1 float, the A2 float, the A3 float and the A4 float float, and the total resistance of the sensor becomes 150 ⁇ .
  • the change of the liquid level can be detected by acquiring the resistance value of the sensor through the single chip microcomputer system.
  • the specific measurement process of the liquid level sensing device of the above embodiment can be continued by taking FIG. 2 as an example.
  • the detection circuit voltage is 5V and the external partial voltage resistance is 500 ⁇ .
  • AD is converted to digital for program judgment.
  • the voltage values other than this are abnormal.
  • the theoretical resistance is 1210 ⁇
  • the actual resistance may be between 1149.5 and 1270.5 ⁇ .
  • the calculated voltage range is between 3.4843V and 3.5880V.
  • the theoretical resistance is 700 ⁇
  • the actual resistance may be between 665-735 ⁇
  • the calculated voltage range is between 2.8541V and 2.9757V.
  • the theoretical resistance is 370 ⁇ , which is actually between 351.5 and 388.5 ⁇ .
  • the calculated voltage range is between 2.0640V and 2.1855V.
  • the actual resistance may be between 142.5-175.5 ⁇
  • the calculated voltage range is between 1.1089V and 1.2990V.
  • the number of floats can be freely increased or decreased according to actual needs, so as to be convenient to use.
  • the resistance values of the respective floating ball joints are set to different resistance values, so that different floating balls float to form different resistance values, and the single chip system can be used to identify
  • the fault state completes the self-check function of the float level sensor; based on the identified fault status, an alarm can be triggered to remind the user to replace the sensor, thereby improving the reliability of the liquid level detection and the user experience.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Level Indicators Using A Float (AREA)

Abstract

La présente invention concerne un dispositif de détection de niveau de liquide et un procédé de détection de niveau de liquide, le dispositif comprenant une pluralité d'unités de mesure de niveau de liquide (202, 204, 206, 208) qui sont connectées séquentiellement et forment un circuit de mesure pour obtenir une mesure à phases multiples du niveau de liquide destiné à être mesuré, chacune des unités de mesure de niveau de liquide (202, 204, 206, 208) comprenant une résistance et un commutateur connectés l'un à l'autre en parallèle, et des valeurs de résistance des résistances dans la pluralité d'unités de mesure de niveau de liquide (202, 204, 206, 208) étant différentes les unes des autres de telle sorte qu'une valeur de résistance totale de la résistance totale du dispositif de détection de niveau de liquide soit différente lors de la mesure par l'unité de mesure de niveau de liquide différente (202, 204, 206, 208). Le dispositif et le procédé peuvent surmonter les inconvénients de la technique antérieure, tels qu'une mauvaise précision de mesure, une faible fiabilité et une grande difficulté de maintenance, etc., et obtiennent les effets avantageux d'une bonne précision de mesure, d'une haute fiabilité et d'une faible difficulté de maintenance.
PCT/CN2017/089493 2016-06-30 2017-06-22 Dispositif de détection de niveau de liquide et procédé de détection de niveau de liquide WO2018001155A1 (fr)

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