CN114323212A - Ultrasonic flowmeter leakage detection device and detection method - Google Patents
Ultrasonic flowmeter leakage detection device and detection method Download PDFInfo
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Abstract
The application discloses ultrasonic flowmeter weeping detection device and detection method, the device includes: a sensor for detecting leaked liquid, wherein the sensor comprises a first conductor portion and a second conductor portion; when the sensor does not have liquid attached, the resistance value between the first conductor part and the second conductor part is a first resistance value; when the sensor is attached by liquid, the first conductor part and the second conductor part are in liquid conductive communication, and the resistance value between the first conductor part and the second conductor part is a second resistance value; the second resistance value is smaller than the first resistance value; a detection circuit for detecting a resistance value of the sensor; and a control part for determining whether liquid leakage occurs according to the detected resistance value. The problem caused by the fact that a scheme for detecting leakage does not exist in the ultrasonic flowmeter in the prior art is solved, and therefore the detection scheme with high detection success rate of leakage is provided.
Description
Technical Field
The application relates to the field of flowmeters, in particular to a liquid leakage detection device and a detection method of an ultrasonic flowmeter.
Background
The built-in pipeline of the ultrasonic flowmeter is made of special plastic materials, has excellent chemical stability, does not react with the liquid to be measured, and does not release metal ions additionally to pollute the liquid to be measured. Due to the particularity, the plastic pipe fittings and the structural members need to be connected and extended by welding and are installed by threads, and liquid leakage can occur after pressure bearing (such as 5MPa) in actual work.
After the leakage occurs, if the leakage is not treated in time, the following problems may occur: the circuit is affected, the reading is inaccurate, and an error is generated. Equipment is short-circuited and burned, fire hazards are generated, damaged pipelines can pollute liquid loaded by the whole equipment, and faults are further enlarged.
Therefore, leakage needs to be effectively detected and timely alarmed for subsequent overhaul treatment. For the ultrasonic flowmeter, no better leakage detection scheme exists in the prior art.
Disclosure of Invention
The embodiment of the application provides a device and a method for detecting leakage of an ultrasonic flowmeter, and aims to at least solve the problem caused by the fact that no better scheme for detecting leakage exists for the ultrasonic flowmeter in the prior art.
According to an aspect of the present application, there is provided an ultrasonic flow meter leakage detecting apparatus including: a sensor for detecting leaked liquid, wherein the sensor comprises a first conductor part and a second conductor part, and the first conductor part and the second conductor part are insulated from each other; a resistance value between the first conductor portion and the second conductor portion is a first resistance value when the sensor is not attached with liquid; when the sensor is attached by a liquid, the first conductor part and the second conductor part are in conductive communication by the liquid, and the resistance value between the first conductor part and the second conductor part is a second resistance value; the second resistance value is smaller than the first resistance value; a detection circuit for detecting a resistance value of the sensor; and the control part is used for determining whether liquid leakage occurs according to the detected resistance value.
Further, the first conductor part and the second conductor part each include a first structure portion and a plurality of second structure portions, the first structure portion is connected to one end of each of the second structure portions, each of the second structure portions has a predetermined interval therebetween, the second structure portions of the first conductor part are distributed in the predetermined interval between the second structure portions of the second conductor part, the second structure portions of the second conductor part are distributed in the predetermined interval between the second structure portions of the first conductor part, a cross distribution between the second structure portions of the first conductor part and the second structure portions of the second conductor part is constituted, and the second structure portions of the first conductor part and the second structure portions of the second conductor part are insulated from each other.
Further, the first structure portion and the second structure portion are both linear or rectangular.
Further, the plurality of second structure portions form a right angle with the first structure portion, and the first structure portion of the first conductor portion and the first structure portion of the second conductor portion are parallel to each other.
Further, the sensor further comprises at least two groups of interfaces, wherein a first interface of each group of interfaces is connected with the first conductor part, a second interface of each group of interfaces is connected with the second conductor part, the detection circuit is connected with the sensor through one group of interfaces of the at least two groups of interfaces, and the at least two groups of interfaces are arranged at different positions of the sensor.
Further, the first conductor portion and the second conductor portion of the sensor are conductors arranged on a PCB.
Further, the conductors arranged on the PCB are tinned or gold-plated conductors.
According to another aspect of the present application, there is also provided an ultrasonic flowmeter leakage detection method, using the detection device described above, the method including: the control portion determines whether or not the resistance value of the sensor detected by the detection circuit changes from the first resistance value to the second resistance value; the control portion determines that liquid leakage occurs in the ultrasonic flowmeter when the resistance value of the sensor becomes the second resistance value; and the control part sends a control command to treat the leakage.
Further, the control part sending a control command to process the leakage comprises: the control part sends a first control command to an alarm unit, wherein the first control command is used for instructing the alarm unit to carry out sound-light alarm.
Further, the control part sending a control command to process the leakage comprises: the control part sends a second control command to a valve control unit, wherein the second control command is used for indicating to close the valve.
In an embodiment of the present application, a sensor is employed for detecting leaked liquid, wherein the sensor includes a first conductor portion and a second conductor portion, and the first conductor portion and the second conductor portion are insulated from each other; a resistance value between the first conductor portion and the second conductor portion is a first resistance value when the sensor is not attached with liquid; when the sensor is attached by a liquid, the first conductor part and the second conductor part are in conductive communication by the liquid, and the resistance value between the first conductor part and the second conductor part is a second resistance value; the second resistance value is smaller than the first resistance value; a detection circuit for detecting a resistance value of the sensor; and the control part is used for determining whether liquid leakage occurs according to the detected resistance value. The problem caused by the fact that a scheme for detecting leakage does not exist in the ultrasonic flowmeter in the prior art is solved, and therefore the detection scheme with high detection success rate of leakage is provided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
fig. 1 is a schematic structural diagram of an ultrasonic flowmeter leakage detection device according to an embodiment of the application.
Fig. 2 is a schematic structural diagram of a sensor according to an embodiment of the present application.
FIG. 3 is a schematic diagram of a detection circuit according to an embodiment of the present application.
Fig. 4 is a flow chart of the leakage detection according to an embodiment of the present application.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
In this embodiment, the ultrasonic flow meter is divided into two types according to the pipeline installation manner: the first method is that an ultrasonic probe is attached to the existing pipeline and is commonly used in the general precision detection occasions of existing large-diameter pipelines such as gas, tap water and the like; the second type needs a special structure design of the built-in measuring pipeline and probe of the flowmeter, and is used in the small-pipe-diameter high-precision flow detection occasions in precision equipment such as pure water, polishing solution and the like. The liquid leakage detection device in the present embodiment can be applied to the above two ultrasonic flow meters, and particularly, can be applied to the second ultrasonic flow meter.
The liquid leakage detection device of the present embodiment can be applied to various ultrasonic flow meters, and will be described below with reference to several examples.
For example, the liquid leakage detecting apparatus in the present embodiment may be applied to an ultrasonic flow meter for measuring a flow rate of a medium flowing through a measuring pipe based on a travel time difference principle, the ultrasonic flow meter including: a measurement pipe having a measurement pipe wall for guiding the medium and at least one pair of shells extending to an outer side of the measurement pipe wall; at least one pair of ultrasonic transducers, each of the at least one pair of ultrasonic transducers having a transducer element for generating and/or sensing ultrasonic pulses and a transducer body containing the transducer element, wherein the ultrasonic pulses travel along a path between the transducers, wherein at least one sub-path of the path extending between the pair of transducers is not parallel to a measurement tube axis of the measurement tube; electronic circuitry for operating the ultrasound transducer and for evaluating the sensed ultrasound pulses; wherein each of the housings is arranged for housing one of the transducers, and wherein the housing comprises an inner surface and a first longitudinal axis and a first inner diameter orthogonal to the first longitudinal axis; wherein the transducer comprises a circumferential surface, and wherein the transducer body comprises a second longitudinal axis, and wherein the transducer comprises an end face exposable to the medium, wherein the end face is provided for transferring the ultrasonic pulses between the transducer element and the medium, and vice versa, and wherein a first section of the transducer comprising the end face of the transducer body has a maximum second diameter orthogonal to the second longitudinal axis, and wherein the housing at least partially encloses the circumferential surface, the transducer comprising at least one first protrusion protruding from the circumferential surface into a gap between the transducer body and the housing, wherein a height of the first protrusion is smaller than a width of the gap and/or the housing comprises at least one second protrusion protruding from the circumferential surface into the gap, wherein a height of the second protrusion is less than a width of the gap.
Wherein the height of the first protrusion is at least 20% and in particular at least 40% of the width of the gap. The height of the second protrusion is at least 20% and in particular at least 40% of the width of the gap. The positioning of the first protrusion is tangentially offset from the positioning of the second protrusion. The ratio of the second diameter (D2) to the first diameter (D1) is within a first interval I1 or a second interval I2, wherein the intervals do not overlap, wherein the upper boundary of the first interval is less than 1 and wherein the lower boundary of the first interval is greater than at least 0.87, and in particular at least 0.90, and preferably at least 0.95, and wherein the upper boundary of the second interval is greater than 0.1, and wherein the lower boundary of the second interval is less than 0.62, and in particular less than 0.55, and preferably less than 0.52.
For another example, the liquid leakage detection apparatus in the present embodiment may also be applied to an ultrasonic flow meter including: a measuring sensor having a connecting flange for connecting a fluid line and an intermediate part through which a fluid flows; at least two ultrasonic transducers accommodated in the intermediate part, forming an ultrasonic transducer pair, between which a measuring path in the flow direction is provided; a pressure sensor mounted in a pressure sensor mount located in the intermediate member and in fluid communication with the interior of the intermediate member through a bulkhead mount; a calibration connector mounted in a calibration connector mount in the intermediate component and in fluid communication with the interior of the intermediate component through the bulkhead mount; wherein a plug may be fed into the plug mount at two positions and in a first position the pressure sensor is in fluid communication with the interior of the intermediate member; and in a second position, the pressure sensor is in fluid communication with the calibration connector through the plug mount.
Wherein the plug can be brought from the first position into the second position and vice versa by rotation. The pressure sensor mount, the calibration connector mount and the plug mount are disposed at an angle relative to each other in a longitudinal direction such that the pressure sensor mount and the calibration connector mount communicate with the plug mount and the plug mount communicates with an interior of the intermediate member. The pressure sensor mount and the opening of the calibration connector mount are disposed at different depths of the plug mount, the opening of the pressure sensor mount is disposed closer to the interior, and the end of the plug located on the front side and facing the interior of the intermediate member is disposed in a sealing manner with respect to the plug mount. The plug is rotated from the first position to the second position by rotation of the screw thread towards the interior of the intermediate part. The pressure sensor mounting seat, the calibration connector mounting seat and the plug mounting seat can be covered by a cover. Further comprising a processing unit arranged at the intermediate part and electrically connected with the pressure sensor by a connection line (64); and the connecting line extends through the wall of the intermediate part via a corresponding hole. A temperature sensor mounted in a temperature sensor mount that can be covered by a cover is provided in the intermediate member to detect the temperature of the fluid.
The liquid leakage detection device in the embodiment can also be applied to other ultrasonic flow meters, and is not listed again.
The following describes the leakage detection device in this embodiment. This embodiment provides an ultrasonic flowmeter weeping detection device, includes:
a sensor for detecting leaked liquid, wherein the sensor comprises a first conductor part and a second conductor part, and the first conductor part and the second conductor part are insulated from each other; a resistance value between the first conductor portion and the second conductor portion is a first resistance value when the sensor is not attached with liquid; when the sensor is attached by a liquid, the first conductor part and the second conductor part are in conductive communication by the liquid, and the resistance value between the first conductor part and the second conductor part is a second resistance value; the second resistance value is smaller than the first resistance value;
a detection circuit for detecting a resistance value of the sensor;
and the control part is used for determining whether liquid leakage occurs according to the detected resistance value.
The problem caused by the fact that a scheme for detecting leakage does not exist for the ultrasonic flowmeter in the prior art is solved through the leakage detection device in the embodiment, and therefore the detection scheme with high leakage detection success rate is provided.
There are many configurations of the first conductor portion and the second conductor portion in the sensor, and in order to enable more accurate detection of a leak, the following configuration is provided in the embodiment: the first conductor part and the second conductor part each include a first structure portion connected to one end of each of the second structure portions with a predetermined interval therebetween, the second structure portions of the first conductor part are distributed in the predetermined interval between the second structure portions of the second conductor part, the second structure portions of the second conductor part are distributed in the predetermined interval between the second structure portions of the first conductor part, the second structure portions of the second conductor part constitute a crossing distribution between the second structure portions of the first conductor part and the second structure portions of the second conductor part, and the second structure portions of the first conductor part and the second structure portions of the second conductor part are insulated from each other.
A comb-like structure is formed by this structure, so that the detection can be made more accurate. Alternatively, in this embodiment, the first structure portion and the second structure portion are both linear or rectangular. The plurality of second structure portions form a right angle with the first structure portion, and the first structure portion of the first conductor portion and the first structure portion of the second conductor portion are parallel to each other.
In this embodiment, the first conductor part and the second conductor part of the sensor are conductors arranged on a PCB. In order to prevent corrosion by leakage, the conductors disposed on the PCB may be tin-plated or gold-plated conductors.
In order to facilitate the matching with different ultrasonic flow meters, the sensor further comprises at least two groups of interfaces, wherein a first interface of each group of interfaces is connected with the first conductor part, a second interface of each group of interfaces is connected with the second conductor part, the detection circuit is connected with the sensor through one group of interfaces of the at least two groups of interfaces, and the at least two groups of interfaces are arranged at different positions of the sensor.
As another optional embodiment, the type of the liquid in the flow meter is also obtained in advance, whether the liquid is conductive or not is determined, if the liquid is non-conductive liquid, the sensor is placed into a conductor liquid for soaking before use, and air drying is performed after soaking, so that the conductor liquid forms a film with conductive ions on the sensor.
Optionally, after the soaking treatment with the conductive liquid, the control part records the number of times that the sensor after the soaking and air-drying treatment has detected the liquid leakage, and in the case that the number of times that the liquid leakage has been detected exceeds a threshold value, the control part sends alarm information, wherein the alarm information is used for indicating that the soaking and air-drying treatment of the conductive liquid is performed on the sensor again.
In this embodiment, a method for detecting liquid leakage of an ultrasonic flowmeter is further provided, where the method includes:
the control portion determines whether or not the resistance value of the sensor detected by the detection circuit changes from the first resistance value to the second resistance value;
the control portion determines that liquid leakage occurs in the ultrasonic flowmeter when the resistance value of the sensor becomes the second resistance value;
and the control part sends a control command to treat the leakage.
For example, the control unit may send a control command to process the leakage, including: the control part sends a first control command to an alarm unit, wherein the first control command is used for instructing the alarm unit to carry out sound-light alarm. Or, the control part sends a second control command to a valve control unit, wherein the second control command is used for indicating to close the valve.
As an optional embodiment, the control portion may control the detection circuit to detect the resistance value of the sensor according to a period, where the period may be configured as a fixed period in advance, and optionally, the control portion may further acquire a value transmitted by a pressure sensor in the ultrasonic flowmeter, and if the value of the pressure sensor is less than or equal to a predetermined value, the control portion controls the detection circuit to detect the resistance value of the sensor using a first period, and if the data of the pressure sensor is greater than the predetermined value, the control portion controls the detection circuit to detect the resistance value of the sensor using a second period, where a duration of the first period is greater than the second period. In this alternative embodiment, the period may be adjusted according to the change in pressure, making the detection more timely.
The problem caused by the fact that a scheme for detecting leakage does not exist for the ultrasonic flowmeter in the prior art is solved through the leakage detection device in the embodiment, and therefore the detection scheme with high leakage detection success rate is provided. An alternative embodiment is described below with reference to the accompanying drawings. In this embodiment, a toothed wired PCB liquid sensing element is used as a sensor to connect the output voltage to the analog-to-digital converter (ADC) input pin of the embedded processor through a voltage divider resistor network. When liquid leakage occurs, the liquid contacts the PCB liquid detection element with the toothed wiring, so that the impedance value of the element is changed violently, the voltage of the voltage division network is changed, the embedded processor collects the voltage in real time, and the liquid leakage can be judged when the voltage exceeds a preset threshold value.
Fig. 2 is a schematic diagram of a sensor structure according to an embodiment of the present application, and as shown in fig. 2, the pattern is a single-sided pattern of a PCB. The two interfaces with the same function are arranged, so that the lead wires can be conveniently connected from different positions, and the adaptability is improved. Solder resist is not placed on the surface of the conductor of the pattern, and a tinning or gold plating process is adopted, so that the corrosion and oxidation of copper materials can be reduced, and the service life is prolonged.
The sensor has two conductor lines insulated from each other and not intersecting each other, and when no liquid is in contact with each other, the resistance between the conductors is 2M or more, which is related to the humidity of air but is not drastically reduced. When contacted by an ion-containing liquid, the electrical resistance between the conductors rapidly decreases to below 100K.
When the liquid is pure water as the flow meter detects, the sensor PCB surface needs to be coated with some saline and air dried because the resistivity of pure water is high. When pure water is again contacted, the inter-conductor resistance also rapidly decreases to 100K or less due to the formation of the electrolyte.
In order to increase the detection area, the conductor lines are drawn as teeth-like structures that are engaged with each other. Meanwhile, the two sides of the PCB adopt the same pattern, and the liquid leakage detection success rate is increased.
Fig. 3 is a schematic diagram of a detection circuit according to an embodiment of the present application, and as shown in fig. 3, a voltage dividing resistor is 100K, and in order to enhance signal stability, a 0.1uF capacitor is connected in parallel to two ends of a sensor to filter noise. The divided voltage is connected to the embedded controller ADC input pin. Wherein + VCC is 3.3V, consistent with the embedded processor supply voltage, and wherein GND is connected to the embedded processor ground.
Because the flowmeter needs directional installation to guarantee that the pipeline can not stay the bubble, the bubble can seriously influence ultrasonic probe work. The weeping sensor that this patent relates to need install to the bottom plane of flowmeter on, after taking place the weeping, liquid receives the action of gravity, and the weeping sensor can be contacted to the probability, guarantees the weeping and detects the success rate.
Fig. 4 is a flow chart of the liquid leakage detection according to the embodiment of the application, and as shown in fig. 4, the ADC sampling is to execute analog-digital conversion code inside the embedded processor, obtain a digital quantity corresponding to the input voltage, and calculate the resistance of the sensor through conversion. The conversion formula is as follows:
according to the principle of resistance voltage division: vx/3.3v ═ RSensor with a sensor element/(RSensor with a sensor element+100K)
The derivation is as follows:
Rsensor with a sensor element＝(Vx/(3.3v-Vx))*100K
Wherein Vx is the voltage that ADC gathered, and R sensor is sensor resistance. After the sensor resistance is obtained, the process of judging whether the sensor resistance exceeds the threshold value is as follows:
and if the resistance of the sensor is lower than 100K, the judgment is satisfied, the program continues to run downwards, and operations such as alarming, stopping valve control and the like are executed. If the sensor resistance is higher than or equal to 100K. And judging that the signal is not met, and returning the program to the head to circularly execute acquisition.
In this embodiment, an electronic device is provided, comprising a memory in which a computer program is stored and a processor configured to run the computer program to perform the method in the above embodiments.
The programs described above may be run on a processor or may also be stored in memory (or referred to as computer-readable media), which includes both non-transitory and non-transitory, removable and non-removable media, that implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
These computer programs may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks, and corresponding steps may be implemented by different modules.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. An ultrasonic flowmeter weeping detection device characterized by, includes:
a sensor for detecting leaked liquid, wherein the sensor comprises a first conductor part and a second conductor part, and the first conductor part and the second conductor part are insulated from each other; a resistance value between the first conductor portion and the second conductor portion is a first resistance value when the sensor is not attached with liquid; when the sensor is attached by a liquid, the first conductor part and the second conductor part are in conductive communication by the liquid, and the resistance value between the first conductor part and the second conductor part is a second resistance value; the second resistance value is smaller than the first resistance value;
a detection circuit for detecting a resistance value of the sensor;
and the control part is used for determining whether liquid leakage occurs according to the detected resistance value.
2. The apparatus of claim 1, wherein the first conductor portion and the second conductor portion each include a first structure portion and a plurality of second structure portions, the first structure portion is connected to one end of each of the second structure portions, each of the second structure portions has a predetermined spacing therebetween, the second structure portions of the first conductor portion are distributed in the predetermined spacing between the second structure portions of the second conductor portion, the second structure portions of the second conductor portion are distributed in the predetermined spacing between the second structure portions of the first conductor portion, the second structure portions of the first conductor portion and the second structure portions of the second conductor portion constitute a cross distribution between the second structure portions of the first conductor portion and the second structure portions of the second conductor portion, and the second structure portions of the first conductor portion and the second structure portions of the second conductor portion are insulated from each other.
3. The device of claim 2, wherein the first and second structural portions are both linear or rectangular.
4. The device of claim 3, wherein a plurality of the second structure portions form a right angle with the first structure portions, and the first structure portions of the first conductor portions and the first structure portions of the second conductor portions are parallel.
5. The device of any one of claims 1 to 4, wherein the sensor further comprises at least two sets of interfaces, wherein a first interface of each set of interfaces is connected to the first conductor portion, a second interface of each set of interfaces is connected to the second conductor portion, and the detection circuit is connected to the sensor through one of the at least two sets of interfaces, the at least two sets of interfaces being disposed at different locations of the sensor.
6. The device of any one of claims 1 to 4, wherein the first and second conductor portions of the sensor are conductors disposed on a PCB.
7. The apparatus of claim 6, wherein the conductors disposed on the PCB are tin plated or gold plated conductors.
8. A method for detecting leakage of an ultrasonic flowmeter, wherein the detection is performed using the detection device according to any one of claims 1 to 7, the method comprising:
the control portion determines whether or not the resistance value of the sensor detected by the detection circuit changes from the first resistance value to the second resistance value;
the control portion determines that liquid leakage occurs in the ultrasonic flowmeter when the resistance value of the sensor becomes the second resistance value;
and the control part sends a control command to treat the leakage.
9. The method of claim 8, wherein the control portion sending a control command to process the leakage comprises:
the control part sends a first control command to an alarm unit, wherein the first control command is used for instructing the alarm unit to carry out sound-light alarm.
10. The method of claim 8, wherein the control portion sending a control command to process the leakage comprises:
the control part sends a second control command to a valve control unit, wherein the second control command is used for indicating to close the valve.
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| CN115543679A (en) * | 2022-11-30 | 2022-12-30 | 苏州浪潮智能科技有限公司 | Liquid leakage detection line detection method, system, device, server and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115543679A (en) * | 2022-11-30 | 2022-12-30 | 苏州浪潮智能科技有限公司 | Liquid leakage detection line detection method, system, device, server and electronic equipment |
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