CN106872078B - Double-channel pipe body for ultrasonic heat meter - Google Patents
Double-channel pipe body for ultrasonic heat meter Download PDFInfo
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- CN106872078B CN106872078B CN201710266525.3A CN201710266525A CN106872078B CN 106872078 B CN106872078 B CN 106872078B CN 201710266525 A CN201710266525 A CN 201710266525A CN 106872078 B CN106872078 B CN 106872078B
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- pipe body
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- 238000007789 sealing Methods 0.000 claims description 14
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 13
- 238000004364 calculation method Methods 0.000 abstract description 12
- 238000012937 correction Methods 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 239000012530 fluid Substances 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 4
- 230000010354 integration Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K17/00—Measuring quantity of heat
- G01K17/06—Measuring quantity of heat conveyed by flowing media, e.g. in heating systems e.g. the quantity of heat in a transporting medium, delivered to or consumed in an expenditure device
- G01K17/08—Measuring quantity of heat conveyed by flowing media, e.g. in heating systems e.g. the quantity of heat in a transporting medium, delivered to or consumed in an expenditure device based upon measurement of temperature difference or of a temperature
- G01K17/10—Measuring quantity of heat conveyed by flowing media, e.g. in heating systems e.g. the quantity of heat in a transporting medium, delivered to or consumed in an expenditure device based upon measurement of temperature difference or of a temperature between an inlet and an outlet point, combined with measurement of rate of flow of the medium if such, by integration during a certain time-interval
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/662—Constructional details
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention relates to a double-channel pipe body for an ultrasonic heat meter, and belongs to the technical field of heat metering equipment. The double-channel pipe body is used in an ultrasonic heat meter, and the structure is specially designed, so that the position of double channels formed in a measuring pipe section is optimal, and the accuracy of hot water flow measurement of a heating pipeline is improved. Through the double-channel design, the fluid average flow velocity on two channels can be measured, a channel integration algorithm is adopted, more accurate estimation of the average flow velocity of the cross section of the channel is obtained, and the measurement accuracy is improved. In addition, by reasonably arranging the two-channel positions, the influence of Reynolds number change on flow velocity measurement is reduced, so that a correction calculation method in flow velocity calculation is simplified.
Description
Technical Field
The invention relates to a double-channel pipe body for an ultrasonic heat meter, and belongs to the technical field of heat metering equipment.
Background
For a long time, the hot water heating system in China settles according to the heating area, and the settlement mode of 'package expense' causes the energy saving consciousness of the heating department in the aspects of production, transportation and pipelines to be light, and causes the energy saving consciousness of users to be light, so that the loss caused by the energy saving consciousness of the users is huge each year. The household-based heat charging is gradually popularized by the use of heat meters since the national committee for improvement and national construction department issued the temporary method for urban heat supply price management in 2007. According to experience of developed countries, the energy can be saved by 20-34% by adopting household metering charging measures. The on-off time area allocation method is widely implemented in household heat charging reconstruction, and needs to measure hot water flow in a building heat supply pipeline and calculate heat consumed by the whole building, and on the basis, the heat allocation is completed by combining different indoor areas and corresponding on-off time. The ultrasonic calorimeter has the advantages of small pressure loss, no influence of measured water quality, high precision and the like, and is becoming a new focus in the field of calorimeter research and development. The basic principle of the ultrasonic calorimeter is that ultrasonic transducers arranged on the upstream side and the downstream side of a pipeline transmit ultrasonic waves to fluid in the pipeline, the time difference of downstream propagation and countercurrent propagation of ultrasonic waves can be calculated due to the modulation effect of the fluid, the flow velocity of hot water in the pipeline can be obtained according to a time difference method, and the flow rate of the hot water flowing through a heat supply pipeline can be calculated according to the sectional area of the pipeline. Meanwhile, the temperature difference of the water supply and return water loops is measured by installing a temperature sensor, so that the calculation of the heat quantity released or absorbed by the heat exchange system is completed. However, the existing ultrasonic double-channel calorimeter generally needs to compensate the Reynolds number when calculating the fluid flow in the pipeline according to the time difference, so that the calculation is complicated.
Disclosure of Invention
The invention aims to provide a double-channel pipe body for an ultrasonic heat meter, which is specially designed for the structure of the existing ultrasonic heat meter, so that the double-channel formed in a measuring pipe section is in an optimal state, and the accuracy of hot water flow measurement of a heating pipeline is improved.
The invention provides a double-channel pipe body for an ultrasonic heat meter, which is characterized in that two ends are circular pipe bodies, the middle is square pipe body, circular arc transition is carried out between the circular pipe body and the square pipe body, and reinforcing ribs are arranged on the outer wall of the double-channel pipe body; an upper sensor sealing cavity base and a lower sensor sealing cavity base are machined on the outer wall of the square pipe body, and are vertically symmetrical along the axial direction of the pipe body; the upper sensor sealing cavity base is provided with a first sensor mounting hole and a second sensor mounting hole, the lower sensor sealing cavity base is provided with a third sensor mounting hole and a fourth sensor mounting hole, the first sensor mounting hole and the third sensor mounting hole are coaxial with each other, the second sensor mounting hole and the fourth sensor mounting hole are coaxial with each other, the distance between the pipe wall of the square pipe body and the axis of the square pipe body is d, the distance between the central line of the sensor mounting hole and the axis of the square pipe body is z, and then the ratio of d to z is 0.6 < z/d < 0.7.
The double-channel pipe body for the ultrasonic heat meter has the advantages that:
the ultrasonic heat meter assembled by the double-channel pipe body designed by the invention has the advantages that due to the square pipe design, the flow field in the pipe changes more smoothly, and the flow velocity measurement is facilitated; meanwhile, by adopting a double-channel structure, the fluid average flow velocity on two channels can be measured, a channel integration algorithm is adopted, more accurate estimation of the average flow velocity of the cross section of the channel is obtained, and the measurement accuracy is improved. In addition, the influence of Reynolds number change on flow velocity measurement can be reduced by optimizing and reasonably arranging the two-channel positions, so that a correction calculation method in flow velocity calculation is simplified, and the heat calculation of the flowmeter is simpler and more accurate.
Drawings
Fig. 1 is a schematic structural view of a binaural tube for an ultrasonic heat meter according to the present invention.
Fig. 2 is a cross-sectional view of the binaural tube shown in fig. 1.
Fig. 3 is a two-channel schematic.
Fig. 4 is a graph showing K-factor versus reynolds number for different channel configurations.
In fig. 1 to 3, 1 is a circular tube body, 2 is a square tube body, 3 is a first sensor mounting hole, 4 is a second sensor mounting hole, 5 is a third sensor mounting hole (opposite to the first sensor mounting hole), 6 is a fourth sensor mounting hole (opposite to the second sensor mounting hole), 7 is an upper sensor seal cavity base, 8 is a reinforcing rib, 9 is a sensor wiring hole, 10 is a mounting base of an external meter, 11 is a temperature sensor mounting hole, and 12 is a lower sensor seal cavity base.
Detailed Description
The structure of the double-channel pipe body for the ultrasonic heat meter is shown in fig. 1, two ends of the double-channel pipe body are circular pipe bodies 1, the middle of the double-channel pipe body is square pipe body 2, and circular arc transition is formed between the circular pipe bodies 1 and the square pipe body 2. The outer wall of the double-track pipe body is provided with a reinforcing rib 8. An upper sensor sealing cavity base 7 and a lower sensor sealing cavity base 12 are machined on the outer wall of the square pipe body 2, and the upper sensor sealing cavity base 7 and the lower sensor sealing cavity base 12 are vertically symmetrical along the axial direction of the pipe body. The upper sensor sealing cavity base 7 is provided with a first sensor mounting hole 3 and a second sensor mounting hole 4, the lower sensor sealing cavity base 12 is provided with a third sensor mounting hole 5 and a fourth sensor mounting hole 6, the first sensor mounting hole 3 and the third sensor mounting hole 5 are coaxial with each other, the second sensor mounting hole 4 and the fourth sensor mounting hole 6 are coaxial with each other, the distance between the pipe wall of the square pipe body 2 and the axis of the square pipe body is d, the distance between the center line of the sensor mounting hole and the axis of the square pipe body is z, and the ratio of d to z satisfies 0.6 < z/d < 0.7, as shown in fig. 2.
The following describes the invention in detail with reference to the accompanying drawings: the square pipeline as shown in figure 1 is designed by the invention, the flow velocity is measured by adopting a double-channel ultrasonic time difference method measurement principle, and the flow and the heat in the pipeline body are calculated according to the measured flow velocity. Wherein the position in the sensor mounting hole determines the channel position formed between the sensors for measurement, and the two-channel grip position determines the correction method in the flow calculation. The double-channel pipe body structure ensures the optimal channel position, and can greatly simplify the flow and heat correction calculation in the subsequent pipe body. As shown in fig. 3, when the distance between the pipe wall of the square pipe body 2 and the axis of the square pipe body is d, and the pipe body design requirement of the present invention is met, the channel position is determined by the ratio z/d, and table 1 gives parameters corresponding to 5 different channel positions, and it can be seen from table 1 that when z/d=0.65, the corresponding channel position is the optimal channel position. When the flow velocity of the pipeline section is averaged, the flow velocity distribution correction coefficient is required to convert the channel average flow velocity, and the change of the flow velocity distribution correction coefficient along with the Reynolds number is the most stable at the optimal channel position, so that the influence of the Reynolds number change on flow velocity measurement can be reduced, and the correction calculation method in the flow velocity calculation is simplified.
Table 1 binaural location design list
The calculation formula of the flow velocity distribution correction coefficient of the binaural ultrasonic flowmeter is as follows:
in the formula (i),is->Average flow velocity on channel 1 and channel 2 calculated according to the time difference method ultrasonic velocity measurement principle respectively,/>Is the true reference flow rate.
FIG. 4 shows the variation of the correction factor K with Reynolds number in five channel configurations, ranging from 524 to 1.68X10 5 The flow state from laminar flow to turbulent flow is covered, and the change condition of the K coefficient can be more comprehensively examined. It can be found that in the above five channel configurations, the K-factor is greater than 1, which is caused by the smaller cross-sectional area of the square tube compared to the cross-sectional area of the round tube. On the other hand, the K coefficients differ greatly from one another in the case of fluctuations in the five cases. When the acoustic channel is installed with + -0.5 d, the K coefficient reaches more than 1.2 at low reynolds number, which is larger than the other four cases, and this also explains from the side that the closer to the central position of the channel, the more peak areas of the flow field the acoustic channel flows through, and as the acoustic channel arrangement moves to both sides gradually, the K coefficient is closer to 1 at low reynolds number. The degree of fluctuation of the K coefficient is minimal when the channel configuration is installed in ±0.65d, that is, the measurement performance of the flowmeter is most stable at such channel positions.
The ultrasonic heat meter assembled by the pipe body designed by the invention and the ultrasonic heat meter in the prior art are used for flow test, when the fluid to be measured is respectively in different flows under the condition that the flow change range is 600-60000L/H (liter/hour) and the range ratio is 100:1, the average value of the absolute value of the measurement relative error of the fluid to be measured by the ultrasonic heat meter in the embodiment is less than 2%, and the level 2 precision requirement is met.
Claims (1)
1. The double-channel pipe body is characterized in that two ends of the double-channel pipe body are circular pipe bodies, the middle of the double-channel pipe body is square pipe body, circular arc transition is carried out between the circular pipe body and the square pipe body, and reinforcing ribs are arranged on the outer wall of the double-channel pipe body; an upper sensor sealing cavity base and a lower sensor sealing cavity base are machined on the outer wall of the square pipe body, and are vertically symmetrical along the axial direction of the pipe body; the upper sensor sealing cavity base is provided with a first sensor mounting hole and a second sensor mounting hole, the lower sensor sealing cavity base is provided with a third sensor mounting hole and a fourth sensor mounting hole, the first sensor mounting hole and the third sensor mounting hole are coaxial with each other, the second sensor mounting hole and the fourth sensor mounting hole are coaxial with each other, the distance between the pipe wall of the square pipe body and the axis of the square pipe body is d, the distance between the central line of the sensor mounting hole and the axis of the square pipe body is z, and then the ratio of d to z is 0.6 < z/d < 0.7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710266525.3A CN106872078B (en) | 2017-04-21 | 2017-04-21 | Double-channel pipe body for ultrasonic heat meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710266525.3A CN106872078B (en) | 2017-04-21 | 2017-04-21 | Double-channel pipe body for ultrasonic heat meter |
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| Publication Number | Publication Date |
|---|---|
| CN106872078A CN106872078A (en) | 2017-06-20 |
| CN106872078B true CN106872078B (en) | 2024-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710266525.3A Active CN106872078B (en) | 2017-04-21 | 2017-04-21 | Double-channel pipe body for ultrasonic heat meter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111380585A (en) * | 2020-05-15 | 2020-07-07 | 上海迪伏若流量仪表事务所 | Ultrasonic water meter manufacturing method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09287989A (en) * | 1996-04-19 | 1997-11-04 | Kaijo Corp | Ultrasonic flowmeter |
| CN102288235A (en) * | 2011-04-26 | 2011-12-21 | 广州昉时工业自动控制***有限公司 | Double-track mixed type ultrasonic flowmeter and measuring method |
| CN102322980A (en) * | 2011-09-02 | 2012-01-18 | 山东贝特智联表计有限公司 | Ultrasonic heat meter body and method for determining position parameters of three-dimensional reflection surfaces of ultrasonic heat meter body |
| CN102455368A (en) * | 2010-10-19 | 2012-05-16 | 西克工程有限公司 | Ultrasonic measurement of flow velocity |
| CN103616095A (en) * | 2013-11-21 | 2014-03-05 | 合肥瑞纳表计有限公司 | Double-sound-track ultrasonic heat meter |
| CN106323392A (en) * | 2015-06-23 | 2017-01-11 | 威海市天罡仪表股份有限公司 | An anti-interference measuring pipe segment of an ultrasonic flow sensor |
| CN206787740U (en) * | 2017-04-21 | 2017-12-22 | 清华大学 | A kind of two-channel body for ultrasonic calorimeter |
-
2017
- 2017-04-21 CN CN201710266525.3A patent/CN106872078B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09287989A (en) * | 1996-04-19 | 1997-11-04 | Kaijo Corp | Ultrasonic flowmeter |
| CN102455368A (en) * | 2010-10-19 | 2012-05-16 | 西克工程有限公司 | Ultrasonic measurement of flow velocity |
| CN102288235A (en) * | 2011-04-26 | 2011-12-21 | 广州昉时工业自动控制***有限公司 | Double-track mixed type ultrasonic flowmeter and measuring method |
| CN102322980A (en) * | 2011-09-02 | 2012-01-18 | 山东贝特智联表计有限公司 | Ultrasonic heat meter body and method for determining position parameters of three-dimensional reflection surfaces of ultrasonic heat meter body |
| CN103616095A (en) * | 2013-11-21 | 2014-03-05 | 合肥瑞纳表计有限公司 | Double-sound-track ultrasonic heat meter |
| CN106323392A (en) * | 2015-06-23 | 2017-01-11 | 威海市天罡仪表股份有限公司 | An anti-interference measuring pipe segment of an ultrasonic flow sensor |
| CN206787740U (en) * | 2017-04-21 | 2017-12-22 | 清华大学 | A kind of two-channel body for ultrasonic calorimeter |
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