CN117804580A - Method for measuring central shaft temperature of piston type volume tube and correcting standard volume - Google Patents
Method for measuring central shaft temperature of piston type volume tube and correcting standard volume Download PDFInfo
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- CN117804580A CN117804580A CN202410001418.8A CN202410001418A CN117804580A CN 117804580 A CN117804580 A CN 117804580A CN 202410001418 A CN202410001418 A CN 202410001418A CN 117804580 A CN117804580 A CN 117804580A
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- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 25
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- 238000001514 detection method Methods 0.000 claims description 17
- 238000012360 testing method Methods 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 14
- 238000004364 calculation method Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000006870 function Effects 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
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- 238000004590 computer program Methods 0.000 claims description 3
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- 238000012795 verification Methods 0.000 description 7
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- 238000007789 sealing Methods 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
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- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention discloses a method for measuring the central axis temperature of a piston type volume tube and correcting a standard volume. The method comprises the steps of firstly, obtaining a standard gauge instruction value in a piston type volume tube calibration experiment; secondly, according to a temperature sensor and a pressure sensor at the upstream and downstream of the piston type volume pipe, obtaining the temperature and the pressure in the volume pipe; then calculating a first correction factor according to the temperature of a central shaft of a piston of the piston type volume tube; and finally, calculating the correction of the standard volume value of the volume tube with the central axis according to the standard volume value, the temperature and the pressure in the tube and the first correction factor. According to the invention, the temperature of the central shaft is monitored, and the correction of the standard volume value of the volume tube with the central shaft is added based on the correction formula of the standard volume value of the volume tube in the national calibration regulation of the volume tube, so that the reduction of the precision of the volume tube caused by the heat exchange between the outside of the outer end of the piston rod and the volume tube is avoided.
Description
Technical Field
The invention belongs to the technical field of instruments and meters, and particularly relates to a method for measuring the central shaft temperature of a piston type volume tube and correcting a standard volume.
Background
With the global economic integration development, oil is increasingly used as a commodity to trade internationally, and metering and handover of oil is used as a benefit mark to be a key point of attention of merchants and clients. The verification work of the flowmeter is an important measure for ensuring the accuracy of the oil gas flowmeter, the piston type volume pipe is used as a dynamic volume flow standard device, has a skid-mounted structure and a carrying function, thereby realizing the on-site calibration of the flowmeter, and the device has the advantages of simple structure, convenient use, high accuracy and the like, is easy to solve on-line verification requirements and meets the verification accuracy requirement, and is commonly used as a liquid flowmeter verification device in a metering mechanism.
The upstream and downstream piston rods in the piston type volume tube are key components in the piston system, move together with the piston in the volume tube, ensure that the volumes of the upstream and downstream piston replacement are equal, and play a vital role in ensuring the verification accuracy of the flowmeter. According to JJG 209-2010 'volume tube verification procedure' and ISO 7278-2 'Petroleummeasurement systems-Part 2:Pipe prover design,calibration and operation', the volume expansion coefficient and wall temperature of the volume tube and standard gauge materials, the volume expansion coefficient and compression coefficient of water, the gauge pressure, the inner diameter, the wall thickness and other parameters of the liquid in the volume tube are corrected for the standard volume value of the volume tube, but the correction for the standard volume value of the volume tube with the piston center shaft is not needed. In the piston type volume tube testing process, heat exchange is inevitably carried out between the two ends of the outer side of the piston rod and the outside temperature in the volume tube, so that the whole temperature of the piston rod is uneven, the replaced standard volume value is changed, the precision of the volume tube is difficult to ensure, and the calibrated flowmeter is unreliable.
Disclosure of Invention
In order to solve the problems, the invention provides a method for measuring the temperature of a central shaft of a piston type volume pipe and correcting a standard volume value, which can monitor the temperature change of a piston rod in real time in the process of testing the volume pipe, further correct the standard volume value of the central shaft in the process of testing, and also can give an alarm for the problems of dynamic seal or coaxiality and the like possibly occurring in the process of testing the volume pipe.
In a first aspect of the present invention, there is provided a method for correcting standard volume of a piston type volumetric tube, comprising the steps of:
and obtaining a standard gauge indication value in a piston type volume tube calibration experiment.
And obtaining the temperature and the pressure in the volume pipe according to the temperature sensor and the pressure sensor at the upstream and the downstream of the piston type volume pipe.
A first correction factor is calculated based on a piston center axis temperature of the piston-type volumetric tube.
And calculating the correction of the standard volume value of the volume tube with the central axis according to the standard volume value, the temperature and the pressure in the tube and the first correction factor.
In a fourth aspect of the present invention, there is provided a piston type volume tube standard volume correction device comprising:
and the indication value acquisition module is used for acquiring the indication value of the standard gauge in the piston type volume tube calibration experiment.
And the temperature and pressure acquisition module is used for acquiring the temperature and pressure in the volume pipe according to the temperature sensor and the pressure sensor at the upstream and the downstream of the piston-type volume pipe.
And the first correction factor calculation module is used for calculating the first correction factor according to the temperature of the central axis of the piston type volume tube.
And the correction module is used for calculating the correction of the standard volume value of the volume tube with the central axis according to the standard volume value, the temperature and the pressure in the tube and the first correction factor.
A third aspect of the present invention provides an electronic device comprising: a processor and a memory;
the memory is for storing a program for supporting a processor configured to execute the program stored in the memory to perform the above method.
In a fourth aspect of the invention, a storage medium is provided, on which a computer program is stored which, when being executed by a processor, performs the above-mentioned method.
Compared with the prior art, the invention has the following beneficial effects:
the invention obtains the temperature of the whole piston center shaft monitored in real time based on the temperature sensors arranged at the two ends of the outer side of the piston rod and at the upstream and downstream of the volume pipe, and the original volume pipe mechanical structure is not required to be changed, so that the realization method is simple and efficient.
According to the invention, the temperature of the central shaft is monitored, and the correction of the standard volume value of the volume tube with the central shaft is added based on the correction formula of the standard volume value of the volume tube in the national calibration regulation of the volume tube, so that the reduction of the precision of the volume tube caused by the heat exchange between the outside of the outer end of the piston rod and the volume tube is avoided.
The invention can realize the adjustment of the temperature interval according to the temperature interval of the normal operation of the corresponding volume pipe under different medium temperatures, synchronously monitor the temperature of the central shaft of the piston, and ensure that the operation of the volume pipe can accurately correct the standard volume value.
According to the invention, the temperature of the piston central shaft is monitored according to the temperature interval of normal operation of the volume pipe, the problems such as dynamic seal or coaxiality which possibly occur in the process of testing the volume pipe are judged, whether the temperature of the piston central shaft exceeds the interval is judged, and an alarm prompt is sent out through the system, so that the investigation and maintenance work of the piston volume pipe are facilitated.
Drawings
FIG. 1 is a schematic diagram of the operation of a piston-type volumetric tube test;
FIG. 2 is a graph showing the temperature distribution of the center axis of the piston-type volumetric tube during the test of the photoelectric switch through two positions;
FIG. 3 is a flow chart for monitoring the temperature of the central axis of the volumetric tube piston and correcting standard volume.
Reference numerals: 1. an inlet pressure sensor; 2. an inlet temperature sensor; 3. a piston-type volumetric tube cylinder; 4. a temperature sensor at the downstream piston rod; 4. a temperature sensor at the downstream piston rod; 5. a dynamic seal at the downstream; 6. a piston; 7. a flow meter to be inspected; 8. an outlet pressure sensor; 9. an outlet temperature sensor; 10. upstream dynamic sealing; 11. ending the detection of the photoelectric switch; 12. a measuring rod; 13. starting to detect the photoelectric switch; 14. a temperature sensor at the upstream piston rod; 15. and a control system.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
In a first aspect, embodiments of the present invention provide a piston-type volumetric tube central axis temperature measurement, the method comprising:
according to the temperature sensor installed in the center of the two end faces of the piston rod, the temperature of the two sides of the piston rod is obtained.
And obtaining the temperatures of the upstream and downstream in the volume pipe according to the temperature sensors of the upstream and downstream in the piston-type volume pipe.
And obtaining a temperature distribution curve at the central axis of the piston according to the temperature of the two sides of the piston rod and the temperature of the upstream and downstream in the volume tube.
The temperature distribution curve at the central shaft of the piston provided by the method is based on the temperature sensors arranged at the two ends of the outer side of the piston rod and at the upstream and downstream of the volume pipe, so that the temperature of the whole central shaft of the piston is monitored in real time, the original mechanical structure of the volume pipe is not required to be changed, and the method is simple and efficient.
With reference to the first aspect, an embodiment of the present invention provides a correction of a standard volume value of a volume tube with a central axis, including:
and obtaining a standard gauge indication value of the piston type volume tube calibration experiment, namely a standard volume value of the piston type volume tube.
And obtaining the temperature and the pressure in the pipe in the measuring process of the volume pipe according to the temperature sensor and the pressure sensor at the upstream and the downstream of the piston type volume pipe.
And calculating a first correction factor according to the temperature of the central shaft of the piston during the piston type volume tube test.
And calculating the correction of the standard volume value of the volume tube with the central axis according to the standard volume value, the temperature and the pressure in the tube and the first correction factor.
According to the method, firstly, the indication value of the standard measuring instrument in the piston type volume tube calibration experiment, namely the standard volume value of the piston type volume tube, is obtained, the correction of the standard volume value of the volume tube with the central axis is added based on a correction formula of the standard volume value of the volume tube in the national calibration regulation of the volume tube, and a correction mode for calculating the standard volume value of the volume tube with the central axis is provided through the temperature and the pressure in the tube and the first correction factor.
With reference to the first aspect, in one possible design, the correction of the standard volume value of the volume tube with the central axis is obtained by the following calculation method:
wherein: v (V) ps The volume value L of the volume pipe in the standard state; v (V) s Indicated by a standard gauge, L; beta s The volume expansion coefficient is 1/DEGC for the material of the standard gauge; beta w Is the volume expansion coefficient of water, 1/°c; t is t s ，t p Wall temperature (water temperature measured in the measuring device and the volume tube is replaced) of the standard measuring device and the volume tube; a, a p The linear expansion coefficient of the material of the volume tube is 1/DEGC; a, a r The linear expansion coefficient of the material of the measuring rod is 1/DEGC; t is t r To measure the temperature of the rod, DEG C; p (P) p The gauge pressure of the liquid in the volume tube is Pa; d is the inner diameter of the standard volume section of the volume pipe, m; e is the elastic modulus of the material of the volume tube and Pa; t is the wall thickness of the standard volume section of the volume pipe, and m; f (F) w Is the compression coefficient of water, 1/Pa; deltaV z Is the first correction factor.
With reference to the first aspect, in one possible design, the calculating the first correction factor according to the temperature of the central axis of the piston when the piston type volume tube is tested includes:
in the process of acquiring the piston type volume tube test, when the piston rod sequentially passes through two detection photoelectric switches, the temperature curves of the central shaft at two time points are obtained.
The coefficient of bulk expansion of the central axis of the piston is obtained.
And calculating a first correction factor according to the temperature curves of the central shaft at two time points and the volume expansion coefficient of the central shaft.
By the method, the temperature curve of the central shaft at two time points can be linearly integrated, wherein the integral interval is the length of the central shaft in the volume tube, the average temperature of the central shaft is obtained on the basis, the first correction factor is calculated by the coefficient of volume expansion of the central shaft after the temperature difference is obtained with 20 ℃, and a mode for calculating the first correction factor by calculating the temperature of the central shaft of the piston in the piston type volume tube test is provided on the basis.
With reference to the first aspect, in one possible design, the calculating the first correction factor by using the temperature of the central axis of the piston during the piston type volume tube test is obtained by the following calculation method:
wherein T (x) 1 A temperature-length distribution curve function of the central shaft in the volume tube when passing through the start detection switch; t (x) 2 A temperature-length distribution curve function of the central shaft in the volume tube when passing through the start detection switch; x is the length variable of the central axis, mm, a z A bulk expansion coefficient of 1/°c for the central axis; l is the length of the central shaft in the volume tube, and mm; x is x 1 、x 2 The beginning and the end positions of the central shaft in the volume tube when passing through the beginning detection switch; x's' 1 、x' 2 The central shaft is positioned at the beginning and the end of the length of the volume tube when passing through the end detection switch.
The first correction factor given by the method is brought into the method for correcting the standard volume value of the volume tube with the central shaft, and the standard volume value after the volume tube test can be corrected by monitoring the temperature of the central shaft. By monitoring the temperature of the central shaft and based on a correction formula of the standard volume value of the volume tube in the national calibration regulations of the volume tube, the correction of the standard volume value of the volume tube with the central shaft is added, and the reduction of the precision of the volume tube caused by the heat exchange between the outside of the outer side of the piston rod and the volume tube is avoided.
In a second aspect, an embodiment of the present invention further provides a piston type volumetric tube standard volume correction device, including:
the instruction value acquisition module is used for acquiring an instruction value of a standard gauge in a piston type volume tube calibration experiment;
the temperature and pressure acquisition module is used for acquiring the temperature and pressure in the volume pipe according to the temperature sensor and the pressure sensor at the upstream and the downstream of the piston-type volume pipe;
the first correction factor calculation module is used for calculating a first correction factor according to the temperature of the central shaft of the piston type volume tube;
and the correction module is used for calculating the correction of the standard volume value of the volume tube with the central axis according to the standard volume value, the temperature and the pressure in the tube and the first correction factor.
In a third aspect, an embodiment of the present invention provides an electronic device, including: a memory and a processor; the memory is for storing a program for supporting a processor configured to execute the program stored in the memory to perform the above method.
In a fourth aspect, embodiments of the present invention provide a storage medium having a computer program stored thereon, which when executed by a processor performs the method of the claims.
The invention provides a method for measuring the temperature of a central shaft of a piston type volume pipe and correcting the standard volume, which is characterized in that the temperature distribution curve of the central shaft of the piston and the pressure of an inlet and an outlet of the piston are obtained through real-time measurement, the standard volume value of the central shaft is further corrected in the testing process, and meanwhile, the problems of dynamic sealing, coaxiality and the like possibly occurring in the testing process of the volume pipe can be alarmed.
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1, the measurement principle of the piston type volumetric tube flow standard device is based on the volume displacement principle, the arrow direction in the figure is the given flow direction, a piston system in the piston type volumetric tube cylinder 3 is injected into the inlet of the piston type volumetric tube at a certain flow before the test, the movement of the piston 6 from the upper drawing position to the lower drawing position represents the movement of the piston 6 from the start detection photoelectric switch 13 to the end detection photoelectric switch 11 on the measuring rod 12, the volume of fluid displaced by the piston 6 in the process represents the standard volume Δv in the detection process, and the detection time is Δt, so that the accumulated flow is obtained for verification of the detected flowmeter 7.
The central section of the central shaft of the piston is always positioned in the volume tube, so that the temperature is relatively stable, and the two ends of the outer side of the piston rod inevitably move back and forth between the volume tube and the outside temperature to perform heat exchange, so that the temperatures of the two ends of the piston rod and the temperature of the central section are opposite to each other to perform heat conduction. The temperature of the upstream and downstream parts in the pipe can be monitored in real time by the volume pipe, and the temperature changes of the two ends of the outer side of the piston rod can not be measured, so that the temperature parameters of the upstream and downstream parts in the volume pipe are obtained by measuring the temperature sensor 2 at the inlet and the temperature sensor 9 at the outlet, the temperature parameters of the two ends of the outer side of the piston rod are obtained by measuring the temperature sensor 4 at the downstream piston rod and the temperature sensor 14 at the upstream piston rod, and the temperature distribution curve of the central shaft is further obtained.
When the piston type volume tube starts to test, the piston rod sequentially passes through the start detection photoelectric switch 13 and the end detection photoelectric switch 11, and the temperature distribution curve of the central shaft inside the volume tube at two time points is recorded, as shown in the upper and lower diagrams of fig. 2. In the first diagram of FIG. 2, interval [ x ] 1 ,x 2 ]For the piston type volume tube, the section of the central axis in the volume tube when the photoelectric switch starts to be detected is recorded, the solid line square frame of the central axis is the region in the volume tube, and the section [ x ] 1 ’,x 2 ’]And finally, the pressure values obtained by the two pressure sensors 1 and 8 at the time synchronous inlet and outlet and corresponding parameters are brought into the formula (1) to finish the correction of the standard volume value of the volume tube with the central shaft, and the calculation process is finished by the control system 15.
As the volume tube is repeatedly tested, the piston 6 is cyclically moved, as shown in fig. 1, such that the upstream and downstream piston rods are in contact with the upstream and downstream dynamic seals 10 and 5 to generate friction, and the piston seals are continually rubbed to cause temperature changes at the upstream and downstream and piston movement. In order to prevent the problems of dynamic sealing or coaxiality change caused by piston deflection of the piston type volume tube. As shown in fig. 2, the temperature of the central shaft of the piston is monitored by the temperature intervals [ T2, T1] of the normal operation of the volume tube, whether the piston type volume tube has faults or not is judged, and then the corresponding temperature intervals [ T2, T1] are adjusted according to different mediums. This determination is accomplished by the control system 15, see FIG. 3.
The above description of the embodiments of the invention has been presented in connection with the drawings but these descriptions should not be construed as limiting the scope of the invention, which is defined by the appended claims, and any changes based on the claims are intended to be covered by the invention.
Claims (8)
1. A standard volume correction method for a piston type volume tube is characterized by comprising the following steps:
acquiring an indication value of a standard gauge in a piston type volume tube calibration experiment;
obtaining the temperature and pressure in the volume pipe according to the temperature sensor and the pressure sensor at the upstream and downstream of the piston type volume pipe;
calculating a first correction factor according to the temperature of a central shaft of a piston of the piston type volume tube;
and calculating the correction of the standard volume value of the volume tube with the central axis according to the standard volume value, the temperature and the pressure in the tube and the first correction factor.
2. The method for correcting the standard volume of the piston type volume tube according to claim 1, wherein the method comprises the following steps of: the piston central shaft temperature obtaining mode is as follows:
the centers of two end surfaces of the piston rod are provided with inserted temperature sensors to obtain the changing temperatures of the two sides of the piston rod;
according to the temperature sensors at the upstream and downstream of the piston type volume pipe, the temperature at the upstream and downstream of the volume pipe is obtained;
and obtaining a temperature distribution curve at the central axis of the piston according to the temperature of the two sides of the piston rod and the temperature of the upstream and downstream in the volume tube.
3. The method for correcting the standard volume of the piston type volume tube according to claim 1, wherein the method comprises the following steps of: the calculation process of the first correction factor is as follows:
acquiring temperature curves of a central shaft at two time points when a piston rod sequentially passes through two detection photoelectric switches in the testing process of the piston type volume tube;
acquiring the volume expansion coefficient of a central shaft of the piston;
and calculating a first correction factor according to the temperature curves of the central shaft at two time points and the volume expansion coefficient of the central shaft.
4. A method of correcting a standard volume of a piston-type volumetric tube according to claim 3, wherein: the first correction factor is obtained by the following calculation method:
wherein T (x) 1 A temperature-length distribution curve function of the central shaft in the volume tube when passing through the start detection switch; t (x) 2 A temperature-length distribution curve function of the central shaft in the volume tube when passing through the start detection switch; x is the length variable of the central axis, alpha z A coefficient of bulk expansion for the central axis; l is the length of the central axis in the volume tube; x is x 1 、x 2 The beginning and the end positions of the central shaft in the volume tube when passing through the beginning detection switch; x's' 1 、x' 2 The central shaft is positioned at the beginning and the end of the length of the volume tube when passing through the end detection switch.
5. A method of correcting a standard volume of a piston type volumetric tube according to any one of claims 1 to 4, wherein: the correction of the standard volume value of the volume tube is obtained by the following calculation method:
wherein V is ps The volume value of the volume tube in the standard state is obtained; v (V) s Indicating values for a standard gauge; beta s The volume expansion coefficient is the volume expansion coefficient of the standard gauge material; beta w Is the bulk expansion coefficient of water; t is t s ，t p Wall temperature for standard gauge and volume tube; alpha p The linear expansion coefficient of the material of the volume tube; a, a r The linear expansion coefficient of the material of the measuring rod is measured; t is t r To measure the temperature of the rod; p (P) p A gauge pressure of the liquid in the volume tube; d is the inner diameter of the standard volume section of the volume pipe; e is the elastic modulus of the material of the volume tube; t is the wall thickness of the standard volume section of the volume pipe; f (F) w Is the compression coefficient of water; deltaV z Is the first correction factor.
6. A piston type volumetric tube standard volume correction device, comprising:
the instruction value acquisition module is used for acquiring an instruction value of a standard gauge in a piston type volume tube calibration experiment;
the temperature and pressure acquisition module is used for acquiring the temperature and pressure in the volume pipe according to the temperature sensor and the pressure sensor at the upstream and the downstream of the piston-type volume pipe;
the first correction factor calculation module is used for calculating a first correction factor according to the temperature of the central shaft of the piston type volume tube;
and the correction module is used for calculating the correction of the standard volume value of the volume tube with the central axis according to the standard volume value, the temperature and the pressure in the tube and the first correction factor.
7. An electronic device, characterized in that: the electronic device includes: a processor and a memory;
the memory is for storing a program for supporting a processor to perform the method of any of claims 1-5, the processor being configured for executing the program stored in the memory.
8. A storage medium having stored thereon a computer program which, when executed by a processor, performs the method of any of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410001418.8A CN117804580A (en) | 2024-01-02 | 2024-01-02 | Method for measuring central shaft temperature of piston type volume tube and correcting standard volume |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410001418.8A CN117804580A (en) | 2024-01-02 | 2024-01-02 | Method for measuring central shaft temperature of piston type volume tube and correcting standard volume |
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| Publication Number | Publication Date |
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| CN117804580A true CN117804580A (en) | 2024-04-02 |
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| CN202410001418.8A Pending CN117804580A (en) | 2024-01-02 | 2024-01-02 | Method for measuring central shaft temperature of piston type volume tube and correcting standard volume |
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| CN (1) | CN117804580A (en) |
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- 2024-01-02 CN CN202410001418.8A patent/CN117804580A/en active Pending
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