CN202582612U - Mining vortex shedding flow meter - Google Patents
Mining vortex shedding flow meter Download PDFInfo
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- CN202582612U CN202582612U CN 201220232745 CN201220232745U CN202582612U CN 202582612 U CN202582612 U CN 202582612U CN 201220232745 CN201220232745 CN 201220232745 CN 201220232745 U CN201220232745 U CN 201220232745U CN 202582612 U CN202582612 U CN 202582612U
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Abstract
The utility model discloses a mining vortex shedding flow meter. The mining vortex shedding flow meter is characterized in that a vortex shedding flow sensor and a thermal flow sensor are jointly arranged on a support rod which is vertically arranged in a pipeline of tested fluid; a fluid flow speed is measured through the vortex shedding flow sensor when the fluid flow speed is in a range from an upper measurement limit value and a lower measurement limit value which are set by the vortex shedding flow sensor; and the fluid flow speed is measured by the thermal flow sensor when the fluid flow speed exceeds the range from the upper measurement limit value and the lower measurement limit value which are set by the vortex shedding flow sensor. The mining vortex shedding flow meter provided by the utility model simultaneously has the performance advantages of the high precision of the vortex street flow sensor and the wide measuring range of the hot type flow sensor, and is suitable for the practical application condition when the gas flow speed in a mine is low or high.
Description
Technical field
The utility model relates to a kind of mining vortex shedding flow meter.
Background technology
Vortex shedding flow meter is a kind of vortex inner separation recycling flowmeter that utilizes the natural vibration principle to process.When fluid flows through the vortex shedder perpendicular to direction of flow with enough big flow velocity, then produce the vortex row of marshallings, switched in opposite along two parallel lines in the back that body takes place.The number of vortex row, promptly the vortex street frequency is directly proportional with flow rate of fluid, just can know flow rate of fluid through measuring this vortex street frequency, and then obtain fluid flow.Typical vortex street frequency measurement is to detect through the piezoeletric quartz sensor that is contained in column body, is transformed to pulse signal after amplifying through charge amplifier.
Thermal gas flowmeter is based on the thermal diffusion principle and the designed flow instrument, comes indirect measurement gas flow velocity through measuring the heat that gas is taken away in the pipeline.Typical thermal gas flowmeter is placed two RTDs in pipeline, a RTD adds very little electric current (current value does not generate heat with assurance resistance) below 4mA, be used for the perception fluid temperature (F.T.), is called temperature detecting resistance.Another RTD feeds big electric current (current value is generally more than 50mA), is used to measure the speed of fluid, is called the resistance that tests the speed.When media flow, obtain flow speed value through the difference of measuring two RTD resistances.
In mine, because the influence of factors such as geologic condition or equipment, gas flow rate is very low sometimes very high sometimes.Traditional vortex shedding flow meter can't accurately be measured for low flow velocity and high flow rate because measurement range is limited; Though and thermal gas flowmeter can solve the fluid-velocity survey scope, precision is lower.
Summary of the invention
The utility model is for avoiding above-mentioned existing in prior technology weak point, provides that a kind of precision is high, limit for height in the measurement, mining vortex shedding flow meter that lower limit is low.
The utility model adopts following technical scheme for the technical solution problem:
The design feature of the mining vortex shedding flow meter of the utility model is: be vertically to be arranged on the ducted support bar of detected fluid one vortex flow sensors and thermal flow rate sensor are set jointly; When rate of flow of fluid is in measurement higher limit that vortex flow sensors sets and the measurement lower limit value scope, measure the acquisition rate of flow of fluid through said vortex flow sensors; When rate of flow of fluid is in outside measurement higher limit that vortex flow sensors sets and the measurement lower limit value scope, measure the acquisition rate of flow of fluid through said thermal flow rate sensor.
The design feature of the mining vortex shedding flow meter of the utility model also is: the sensor box body that is used to transmit the detection signal of vortex flow sensors and thermal flow rate sensor is fixedly installed on the top of said support bar, and is in the outside of detected fluid pipeline.
Compared with present technology; The utility model beneficial effect is embodied in: the utility model has been taken into account the high precision and the wide performance advantage of thermal flow rate sensor measurement range of vortex flow sensors jointly, high practical situations when low when making it can be applicable to gas flow rate in the mine.
Description of drawings
Fig. 1 is the utility model structural representation;
Fig. 2 is the utility model workflow diagram;
Label among the figure: 10 flow rates of fluid generation bodies; 20 piezoeletric quartz sensors; 100 support bars; 120 sensor box bodys;
Embodiment
Referring to Fig. 1, mining vortex shedding flow meter is to be vertically to be arranged on the ducted support bar 100 of detected fluid one vortex flow sensors and thermal flow rate sensor are set jointly in the present embodiment;
When rate of flow of fluid is in measurement higher limit that vortex flow sensors sets and the measurement lower limit value scope, measure the acquisition rate of flow of fluid through said vortex flow sensors;
When rate of flow of fluid is in outside measurement higher limit that vortex flow sensors sets and the measurement lower limit value scope, measure the acquisition rate of flow of fluid through said thermal flow rate sensor.
In the practical implementation, the sensor box body 120 that is used to transmit the detection signal of vortex flow sensors and thermal flow rate sensor is fixedly installed on the top of said support bar 100, and is in the outside of detected fluid pipeline.
The vortex flow sensors that is adopted in the present embodiment is a conventionally form, includes flow rates of fluid generation body (10) and piezoeletric quartz sensor 20; Thermal flow rate sensor is a conventionally form also, comprises the first RTD R1 and the second RTD R2; Adopt permanent power mode that the first RTD R1 and the second RTD R2 are heated.
Referring to Fig. 2, workflow:
Step 1: after flowmeter started, system carried out initialization and accomplishes self check, and self check is errorless heats thermal flow rate sensor, and waits for a period of time;
Step 2: read the A/D conversion value of output voltage V 2 of output voltage V 1 and the thermal flow rate sensor of piezoeletric quartz sensor respectively, judge in the detected fluid pipeline gas flow rate in view of the above in what scope, and definite behavior pattern.
Step 3: according to behavior pattern decision flow rate calculation method, that is:
When gas flow rate is in measurement higher limit that vortex flow sensors sets and the measurement lower limit value scope, measure the acquisition gas flow rate through vortex flow sensors, carry out flow rate calculation with pattern 2;
When gas flow rate is in the measurement lower limit value that is lower than the vortex flow sensors setting, measure the acquisition gas flow rate through thermal flow rate sensor, carry out flow rate calculation with pattern 1;
When gas flow rate is in the measurement higher limit that is higher than the vortex flow sensors setting, measure the acquisition gas flow rate through thermal flow rate sensor, carry out flow rate calculation with mode 3;
Step 4: show the gas stream value with LCD, and send to host computer, accomplish signal output with the pulse signal of 200 ~ 1000Hz of satisfying mining communication standard.
Step 5: accomplish and measure i.e. shutdown.
Claims (2)
1. mining vortex shedding flow meter is characterized in that: be vertically to be arranged on the ducted support bar of detected fluid (100) one vortex flow sensors and thermal flow rate sensor are set jointly; When rate of flow of fluid is in measurement higher limit that vortex flow sensors sets and the measurement lower limit value scope, measure the acquisition rate of flow of fluid through said vortex flow sensors; When rate of flow of fluid is in outside measurement higher limit that vortex flow sensors sets and the measurement lower limit value scope, measure the acquisition rate of flow of fluid through said thermal flow rate sensor.
2. mining vortex shedding flow meter according to claim 1; The sensor box body (120) that it is characterized in that being used to transmitting the detection signal of vortex flow sensors and thermal flow rate sensor is fixedly installed on the top of said support bar (100), and is in the outside of detected fluid pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220232745 CN202582612U (en) | 2012-05-22 | 2012-05-22 | Mining vortex shedding flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220232745 CN202582612U (en) | 2012-05-22 | 2012-05-22 | Mining vortex shedding flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202582612U true CN202582612U (en) | 2012-12-05 |
Family
ID=47252014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220232745 Expired - Fee Related CN202582612U (en) | 2012-05-22 | 2012-05-22 | Mining vortex shedding flow meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202582612U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280077A (en) * | 2013-07-08 | 2015-01-14 | 克洛纳测量技术有限公司 | Magneto-inductive flowmeter |
-
2012
- 2012-05-22 CN CN 201220232745 patent/CN202582612U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280077A (en) * | 2013-07-08 | 2015-01-14 | 克洛纳测量技术有限公司 | Magneto-inductive flowmeter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20190522 |