RU2568054C1 - Method and device for accelerated calibration of flow meter - Google Patents

Abstract

FIELD: measurement equipment.

SUBSTANCE: device comprises a calibrated section of a pipeline, a displacement piston moving the calibrated section under action of the metered medium flow, detectors of start and end positions of the displacement piston in the calibrated section of the pipeline, a secondary device that accumulates and performs mathematical processing of the measurement information arriving from the calibrated flow meter, a volume meter, a mass meter in the form of a sequence of pulses limited in time by the moments of actuation of detectors of start and end positions of the displacement piston in the calibrated pipeline section. The device includes additional detectors of the start and end positions of the displacement piston and additional measurement channels of the secondary device, which accumulates and mathematically processes pulse sequences from the flow converter, limited in time by moments of actuation of detectors of start and end positions of the displacement piston. The summary number of detectors of the start and end positions of the displacement piston makes at least five.

EFFECT: reduced time of device operation in process of measurements and increased accuracy of measurement results.

6 cl, 6 dwg

Description

1. The technical field to which the invention relates.

The invention relates to the subsection of metrology - flow metering (according to the international classification G01F) and can be used for verification (calibration) of flow meters, volume and mass meters.

2. The level of technology

A device is known - a tube-piston calibration unit (hereinafter TPU) and a foreign analog of TPU - a prover (prover, meter prover) for checking and calibrating a flowmeter technologically associated with it. The properties of TPU and the method for checking flow converters using TPU are given in MI 3380-2012 “Recommendation. State system for ensuring the uniformity of measurements. Volume flow converters. Verification Technique. ” (Approved on September 10, 2012 by the All-Russian Scientific Research Institute of Flow Metering, Kazan). TPU or prover (see Fig. 1) contains a calibrated section of the pipeline (pos. 1), a piston-displacer (pos. 2) moving in the calibrated section under the influence of the flow of the measured medium (in Fig. 1, the flow direction is conventionally shown by an arrow), switch of the flow direction of the measured medium in the TPU (pos. 5), single-signal detectors of the initial (pos. 6, 7) and end (pos. 8, 9) positions of the displacer piston in the calibrated section of the TPU pipeline (or prover), a secondary device (pos. . 3), carrying out the accumulation and mathematical processing of measuring information coming from the flow meter (item 4) in the form of pulse sequences limited in time by the response times of single-signal detectors of the initial and final positions of the displacer piston in the calibrated section of the TPU. TPU uses two single-signal detectors of extreme positions of the piston-displacer, but TPU can also be equipped with four single-signal detectors, two of which are redundant. The initial and final positions of the displacing piston are conventionally designated, since the next switching of the flow of the measured medium causes the displacing piston to move in the opposite direction, therefore single-signal detectors that have worked out the signal for the end of the first passage of the displacing piston through a calibrated section of the pipeline, which is called a half-cycle, become single-signal detectors the beginning of the next half-cycle. Thus, the TPU duty cycle consists of two consecutive half-cycles in the forward and reverse directions.

The disadvantage of TPU (prover) is the need for multiple passage of the displacer piston in a calibrated section to accumulate a sufficient number of pulse sequences from the flow meter (or volume and mass counters) for their statistical analysis and reject invalid measurement results, which leads to significant time and energy costs for calibration or verification of one flow transducer (or volume and mass meters). The time-consuming procedure of multiple measurements is accompanied by a change in the ambient temperature and the measured medium, pressure in the pipeline, a change in the mixing conditions of the streams of the measured medium, which leads to an increase in the error of the measurement result. In addition, in conditions of unstable or smoothly changing flow rate over time, the use of TPU (prover) without taking special measures to maintain the selected flow rate becomes impossible.

Processing of measurement information with the known method of verification (calibration) of the flow meter (or volume and mass counters) is reduced to the accumulation of a sufficient number of pulse sequences during the multiple passage of the displacer piston from the initial position to the final and vice versa to calculate the average value of the conversion coefficient as the ratio of the number of pulses of the flow meter ( or volume and mass counters), averaged over a certain number of operating cycles, to the known volume of the calibrated part and TPU (prover).

3. The invention

The aim of the invention is to reduce the operating time of TPU (prover) during calibration (calibration) of the flow meter (or volume and mass counters) and to increase the accuracy of measurements by eliminating the influence of destabilizing factors that smoothly change over time.

The goal is achieved in that a device for checking (calibrating) a flowmeter, volumetric meter, mass meter, containing a calibrated section of the pipeline, a displacer piston moving in the calibrated section under the influence of the measured medium flow, single-signal detectors of the initial and final positions of the displacer piston in the calibrated section pipelines, a secondary device that accumulates and mathematically processes the measurement information received from the flow meter (or volume and mass meters) in de sequences of pulses limited in time by the moments of operation of the single-signal detectors of the initial and final positions of the displacer piston in the calibrated section of the pipeline, equipped with additional single-signal detectors of the initial and final positions of the piston-displacer during its movement in the calibrated pipeline, additional measuring channels of the secondary device, which accumulates and mathematical processing of pulse sequences from a flow meter (or bulk and mass new counters), time-limited moments of operation of single-signal detectors of the initial and final positions of the displacer piston when it moves in a calibrated section of the pipeline, while the total number of single-signal detectors of the initial and final positions of the piston-displacer is at least five, which ultimately allows faster get the amount of measurement information sufficient for its mathematical processing and certification of the metrological characteristics of the flow meter (or volume and mass output counters), at the selected flow rate of the measured medium, by increasing the total number of pulse sequences from the flow meter (or volume and mass counters), due to the operation of the increased number of single-signal detectors, as well as increasing the accuracy of measurements by reducing the influence of monotonically varying time calibration conditions ( calibration). In order to simplify the design of the TPU (prover), instead of single-signal detectors, it is possible to use detectors of the initial and final positions of the displacer piston, equipped with contact groups that allow you to record the passage of the separator piston by closing a group of normally open contacts. At the same time, it is also constructively possible to simultaneously open a group of normally closed contacts. To exclude cable connections between the contact groups of the detectors and the secondary device, which performs the accumulation and mathematical processing of the measurement information received from the flow meter (or volume and mass counters) in the form of pulse sequences, it is possible to use radio-signal transmission of measurement information using a radio transmitter on the side of the detector and radio receiver - on the side of the secondary device.

Essentially technical solutions, it is proposed:

1. The use of a device for checking (calibrating) a flowmeter, volumetric meter, mass meter, containing a calibrated section of the pipeline, a displacer piston moving in a calibrated section under the influence of a measured medium flow, single-signal detectors of the initial and final positions of a displacer piston in a calibrated pipeline section, a secondary device that performs the accumulation and mathematical processing of measuring information coming from a calibrated (calibrated) flow meter, volumetric meter, mass a new counter in the form of pulse sequences limited in time by the moments of operation of the single-signal detectors of the initial and final positions of the displacer piston in the calibrated section of the pipeline, characterized in that additional single-signal detectors of the initial and final positions of the piston-displacer are introduced when it moves in the calibrated section of the pipeline and measuring channels of a secondary device that performs the accumulation and mathematical processing of a pulse follower the number of single-signal detectors of the initial and final positions of the displacer piston is not less than five times the time limited by the response times of the single-signal detectors of the initial and final positions of the displacer piston.

2. The use of a device for checking (calibrating) a flowmeter, volumetric meter, mass meter according to claim 1, characterized in that instead of single-signal detectors, detectors of the initial and final positions of the displacer piston are installed, equipped with contact groups that allow to close a normally open group when the detector is triggered contacts.

3. The use of a device for checking (calibrating) a flowmeter, volumetric meter, mass meter according to claim 1, characterized in that instead of single-signal detectors, detectors of the initial and final positions of the displacer piston are installed, equipped with contact groups that allow, when the detector is triggered, to open a group of normally closed contacts.

4. The use of a device for checking (calibrating) a flowmeter, volumetric meter, mass meter according to claim 1, characterized in that instead of single-signal detectors, detectors of the initial and final positions of the displacer piston are installed, equipped with contact groups that allow to open a group of normally closed detectors contacts and close the group of normally open contacts.

5. The use of the device according to any one of paragraphs. 1-4, characterized in that the detectors of the initial and final positions of the piston-displacer are equipped with a radio transmitting device, which transmits to the receiving device of the secondary device that performs the necessary processing of the measurement information, the corresponding information about the moments of operation of the detectors.

6. Using the method of accelerated verification (calibration) of the flowmeter, volumetric meter, mass meter using the well-known pipe-piston calibration unit or compact prover with the corresponding secondary instruments and calibrated sections, including the calculation of the conversion coefficient of the calibrated (calibrated) flow meter, volumetric meter, mass meter by assignment of the number of pulses averaged over the period of multiple passage by the piston-displacer of the calibrated section (calibrated) flow meter, volumetric meter, mass meter to the known volume of the calibrated section, characterized in that as a total result of measuring the number of pulses limited in time by the response times of the detectors of the initial and final positions of the displacer piston when it passes in the calibrated section from the initial to the final position and from the final to the initial position, apply the sum of a series of values of the pulse sequences from the calibrated (calibrated) flow meter, o Removable meter, mass meter, by reference to the sum of the respective amounts of the calibrated section, limited in time moments detectors of the initial and final positions of the displacer-piston, wherein the apparatus is applied according to claims. 1-5.

4. The list of drawings (diagrams and drawings)

1. FIG. 1 is a diagram explaining a calibration (calibration) process of a flowmeter using a known TPU (prover).

2. FIG. 2 is a drawing explaining the principle of operation of the prover according to US patent No. 3021703.

3. FIG. 3 is a drawing explaining the principle of operation of the "compact prover" according to US patent No. 4549426.

4. FIG. 4 is a drawing explaining the principle of operation of the detector according to US patent No. 5263220.

5. FIG. 5 is a drawing explaining the possibility of receiving several signals about the detector operation by switching on several reed switches controlled by one magnetic part of the detector (see Fig. 4, items 60 and 61).

6. FIG. 6 is a diagram explaining a calibration (calibration) process of a flowmeter using the claimed TPU.

5. Information confirming the possibility of carrying out the invention

In FIG. 2 is a drawing explaining the principle of operation of the prover in accordance with US patent No. 3021703, where pos. 11 - flow meter, pos. 13, 15, 17 - electronic devices necessary for counting pulses from the flow meter, pos. 19, 20 - flow switches of the measured medium, pos. 22 - calibrated pipe prover, pos. 23 - piston-displacer, pos. 30, 31 - limit switches (single-signal detectors).

In FIG. 3 is a drawing explaining the principle of operation of the "compact prover" in accordance with US patent No. 4549426, where pos. 24, 25 - single-signal detectors made on the basis of sealed magnetically controlled contacts - reed switches, which are triggered by the action of a magnetic initiator pos. 21, mounted on the rod pos. 19 connected to a displacing piston performing measuring cycles in a calibrated compact prover pipe; pos. 56, a controller is designated as a secondary device for counting pulses from a flow meter and calculating a conversion coefficient.

In FIG. 4 is a drawing explaining the principle of operation of the limit switch (single-signal detector) used in the prover (Fig. 2), which has a normally open reed switch contact (key 61), which is closed when the piston-displacer (when it moves) extends the detector rod (pos. .25) into the corresponding “socket” for controlling, using the magnetic part (pos. 60), the contact state of the reed switch.

In FIG. Fig. 5 is a drawing explaining the possibility of receiving several signals about the operation of the detector by switching on several reed switches (pos. 2), controlled by one magnetic part (pos. 1) of the detector (Fig. 4, pos. 61 and 60, respectively).

As detectors of the initial (final) position of the piston-displacer in the claimed TPU, it is possible to use a detector with the replacement of one normally open contact by a contact group, which, when the detector is triggered, independently closes a series of (more than one) normally open contacts, which, accordingly, allows you to replace several detectors to said contact group detector.

When equipping the devices shown in FIG. 2 and FIG. 3, additional detectors of the initial and final positions of the displacer piston may implement the claimed TPU, schematically shown in FIG. 6, where:

1 - calibrated section of the pipeline;

2 - piston-displacer;

3 - secondary device;

4 - flowmeter, volumetric meter or mass meter;

5 - switch the direction of flow of the measured medium in TPU;

6, 7, 8, 9, 10, 11 — position detectors of the displacer piston.

As shown in FIG. 6, the secondary device (pos. 3) is connected to a calibrated (calibrated) flowmeter (pos. 4) and detectors of the displacer piston, from which detectors of the initial position of the displacer piston can be distinguished - pos. 6, 7, 8, end position detectors - pos. 9, 10, 11.

The pulses from the flow meter continuously arriving at the secondary device are taken into account by the secondary device as a sequence of pulses limited by the moments of operation of the detectors. For example, with one pass of the displacer piston in the calibrated section of the pipeline from the initial to the final position and the operation of the secondary device with detectors No. 6, 7, 8, 9, 10, 11, the measurement information consists of the following pulse sequences N _ij (index i detectors of the initial position of the piston-displacer are designated, respectively, the index j denotes the detectors of the final position of the piston-displacer):

N _6-9 , N _6-10 , N _6-11 , N _7-9 , N _7-10 , N _7-11 , N _8-9 , N _8-10 , N _8-11 .

Each pulse sequence corresponds to a certain volume of the displaced measured medium when the piston-displacer moves along the calibrated section of the pipeline, limited by the moments of operation of the respective detectors.

The total number of detectors should be such that pulse sequences proportional to certain volumes provide a reliable result of determining the conversion coefficient of the calibrated (calibrated) flow meter in accordance with the claimed method of accelerated calibration (calibration) of the flow meter, in which using additional measuring channels of the TPU secondary device under the control of the corresponding software, the conversion coefficient of the flowmeter is calculated as the ratio of the sum of a sufficient number of pulses of pulsed sequences N _ij (where i, j are the numbers of detectors of the initial and final positions of the displacer piston that control the operation of the secondary device for generating pulse sequences) and the classification of the resulting sum - ΣN _ij to the sum - ΣV _{ij of the} corresponding volumes of the displaced measured environments limited by the response times of the respective detectors for the period of time the piston-displacer passes through the calibrated section of the pipeline from the initial to the final eniya or per cycle (movement-displacer piston in forward and backward directions).

When taking into account TPU operation cycles, the sum of the pulse sequences contains the values of both N _ij and N _ji , respectively, the sum of the TPU volumes contains the values of both V _ij and V _ji .

Claims (6)

1. A device for checking (calibrating) a flowmeter, volumetric meter, mass meter, containing a calibrated section of the pipeline, a displacer piston moving in a calibrated section under the influence of the medium flow, detectors of the initial and final positions of the displacer piston in a calibrated pipeline section, containing contacts for the issuance of one signal about the operation of the detector, a secondary device that performs the accumulation and mathematical processing of measurement information from the calibrator (calib a flow meter, a volume meter, a mass meter in the form of pulse sequences limited in time by the response times of the detectors of the initial and final positions of the displacer piston in the calibrated section of the pipeline, characterized in that additional detectors of the initial and final positions of the displacer piston are introduced when it moves in calibrated section of the pipeline and additional measuring channels of the secondary device, which carries out the accumulation and mathematical processing of pulse sequences from the flow transducer limited in time by the response times of the detectors of the initial and final positions of the displacer piston, while the total number of detectors of the initial and final positions of the displacer piston is at least five. 2. A device for checking (calibrating) a flowmeter, volumetric meter, mass meter according to claim 1, characterized in that the detectors of the initial and final positions of the piston-displacer are equipped with contact groups, which, when the detector is triggered, close a group of normally open contacts. 3. A device for checking (calibrating) a flowmeter, volumetric meter, mass meter according to claim 1, characterized in that the detectors of the initial and final positions of the piston-displacer are equipped with contact groups, which, when the detector is triggered, open a group of normally closed contacts. 4. A device for checking (calibrating) a flowmeter, volumetric meter, mass meter according to claim 1, characterized in that the detectors of the initial and final positions of the displacer piston are equipped with contact groups, which, when the detector is triggered, open a group of normally closed contacts and close a group of normally open contacts. 5. The device according to paragraphs. 1-4, characterized in that the detectors of the initial and final positions of the piston-displacer are equipped with a radio transmitting device, which transmits to the receiving device of the secondary device that performs the necessary processing of the measuring information, the corresponding information about the moments of operation of the detectors. 6. A method for accelerated verification (calibration) of a flowmeter, volumetric meter, mass meter, including calculating the conversion coefficient of a calibrated (calibrated) flowmeter, volumetric meter, mass meter, characterized in that as a total result of measuring the number of pulses limited in time by the moments of operation of the detectors the initial and final positions of the displacer piston during its passage in a calibrated section from the initial to the final position and from the final to the initial polo In this case, the sum of a series of values of pulse sequences from the calibrated (calibrated) flow meter, volumetric meter, mass meter, with reference to the sum of the corresponding volumes of the calibrated section, limited in time by the response times of the detectors of the initial and final positions of the piston-displacer, is used, the device according to . 1-5.

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