CN116380206A

CN116380206A - Method and equipment for realizing volume tube pulse measurement

Info

Publication number: CN116380206A
Application number: CN202310389758.8A
Authority: CN
Inventors: 沈峰; 王薪达; 田国光; 黎莉妮; 张祖艳
Original assignee: Beijing Watertek Information Technology Co Ltd
Current assignee: Beijing Watertek Information Technology Co Ltd
Priority date: 2023-04-12
Filing date: 2023-04-12
Publication date: 2023-07-04

Abstract

On one hand, through a grating encoder, the pulse number output by a small-sized volume tube of a standard tube section during the calibration of a large-caliber flowmeter is increased, so that the pulse measurement precision is improved; on the other hand, by the double-time pulse counting method, the problem that the flowmeter can only record complete pulse signals is solved, and the pulse measurement accuracy is further improved.

Description

Method and equipment for realizing volume tube pulse measurement

Technical Field

The present application relates to, but is not limited to, flow metering technology, and more particularly to a method and apparatus for performing volumetric tube pulse measurements.

Background

The volume tube has the advantages of simple structure, convenient use, on-site verification and the like. The volume tube is widely applied to the fields of mechanical manufacture, aerospace, trade settlement, energy metering and the like.

The volume tube flow standard device belongs to a dynamic volume method flow standard device and is mainly used for verification and calibration of a flowmeter taking high-viscosity oil products such as aviation lubricating oil and the like as media. The measuring principle of the volume tube flow standard device is based on the volume displacement principle, when a piston in the volume tube triggers two position sensors successively at a certain speed under the pushing of liquid, the displaced fluid volume and the corresponding detection time are recorded, so that the instantaneous flow is obtained. The accuracy of measurement of the volumetric tube flow standard device depends on the timing (pulse time of the position sensor), the number of pulses acquired, the standard volume value, whether only integer pulses can be acquired, etc. For the condition that the volume tube with small standard volume value is used for calibrating the large-caliber flowmeter, the problems of too few pulse number acquisition often occur due to short measurement time and small flowmeter instrument coefficient, and the time difference of unit pulse can cause larger flow measurement error, so that the flowmeter is inaccurate in calibration.

Disclosure of Invention

The application provides a method and device for realizing volume tube pulse measurement, which can improve measurement accuracy.

The embodiment of the invention provides a method for realizing impulse measurement of a volume tube, which is suitable for the condition that a volume tube with a small standard volume value is used for calibrating a large-caliber flowmeter, and comprises the following steps:

acquiring a first time length when a piston in the volume tube passes through a start verification position sensor and an end verification position sensor;

acquiring the complete pulse number and the corresponding second time length of the period when the piston passes through the start verification position sensor and the end verification position sensor;

and correcting the complete pulse number according to the first time length and the second time length to obtain the pulse number measured by the volume tube pulse.

In one example row example, the acquiring a first duration for a piston within the volume tube to pass a start verification position sensor and an end verification position sensor includes:

when the piston in the volume tube is detected to trigger the initial verification position sensor, a first timer is started, and when the piston is detected to trigger the final verification position sensor, the first timer is stopped, and the first duration is obtained according to the timing result of the first timer.

In one example row example, the acquiring the complete number of pulses and their corresponding second durations during the piston passing the start verification position sensor and the end verification position sensor includes:

after detecting that the piston triggers the starting verification position sensor, when a pulse signal sent by the grating encoder reaches a first level, starting a counter to count the complete pulse number, and starting a second timer; and after the piston is detected to trigger the ending verification position sensor, when a pulse signal sent by the grating encoder reaches the first level, closing the counter to stop counting the complete pulse number, stopping the second timer, and obtaining the second duration according to the timing result of the second timer.

In one example row example, the first level is a high level.

In an example row example, the correcting the complete pulse count according to the first duration and the second duration to obtain the pulse count of the volume tube pulse measurement includes:

wherein N represents the pulse number measured by the volume tube pulse, N1 represents the complete pulse number, T represents the first duration, and T1 represents the second duration.

Embodiments of the present application also provide a computer-readable storage medium storing computer-executable instructions for performing the method of implementing volumetric tube pulse measurement as described in any of the above.

The embodiment of the application further provides a device for realizing volume tube pulse measurement, which comprises a memory and a processor, wherein the memory stores the following instructions executable by the processor: a step for performing the method of implementing volumetric tube pulse measurement of any of the above claims.

According to the method for realizing the pulse measurement of the volume tube, on one hand, the number of pulses output by the small volume tube of the standard tube section during the calibration of the large-caliber flowmeter is increased through the grating encoder, so that the pulse measurement precision is improved; on the other hand, by the double-time pulse counting method, the problem that the flowmeter can only record complete pulse signals is solved, and the pulse measurement accuracy is further improved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the technical aspects of the present application, and are incorporated in and constitute a part of this specification, illustrate the technical aspects of the present application and together with the examples of the present application, and not constitute a limitation of the technical aspects of the present application.

FIG. 1 is a schematic diagram of the constitution of a flow standard device for a volumetric tube in an embodiment of the present application;

FIG. 2 is a schematic diagram of the structure of an optical encoder according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a method for implementing pulse measurement of a volume tube according to an embodiment of the present application;

fig. 4 is a flow chart of a method for implementing volumetric tube pulse measurement in an embodiment of the present application.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be arbitrarily combined with each other.

In one typical configuration of the present application, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.

Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may 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 storage media for a computer 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 disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer readable media, as defined herein, does not include non-transitory computer readable media (transmission media), such as modulated data signals and carrier waves.

The steps illustrated in the flowchart of the figures may be performed in a computer system, such as a set of computer-executable instructions. Also, while a logical order is depicted in the flowchart, in some cases, the steps depicted or described may be performed in a different order than presented herein.

The inventor of the application finds out through research that in the case of calibrating a large-caliber flowmeter for a volume pipe with a small standard volume value, if the number of pulses acquired by the volume pipe is increased, the measurement accuracy can be improved. Therefore, the inventor of the application proposes a method for realizing the pulse measurement of the volume tube, and on the basis of collecting the pulse through a grating encoder, the collected pulse number is corrected by a double-time pulse method to improve the pulse measurement precision of the volume tube. In this embodiment, on the one hand, the number of pulses collected by calibrating the flowmeter is increased by the grating encoder. On the other hand, the double-time pulse method is used for correcting the acquired pulse number, so that the problem that errors still exist when the flowmeter pulses are counted even if enough pulse numbers are acquired because the grating encoder can only acquire an integer number of pulses is solved, and the measurement precision is better improved.

Fig. 1 is a schematic structural diagram of a volumetric tube flow standard device according to an embodiment of the present application, and as shown in fig. 1, mainly includes: the grating encoder 1, the flowmeter 3 and the volume pipe 9, wherein the grating encoder 1 is connected with the flowmeter 3, and the flowmeter 3 is connected with the volume pipe 9.

Wherein the grating encoder 1 is used to generate a greater number of pulses than the flow meter 3 itself, as shown in fig. 2, the grating encoder 1 comprises a code wheel 6, a light source 7 for generating continuous light, and a light sensitive tube 8. Wherein the light-sensitive tube 8 is arranged to receive the light signal and the code wheel 6 is arranged to convert the continuous light signal into a light signal with alternating brightness when rotated. In fig. 2, the code wheel 6 is a transparent code wheel, the light source 7 is located at one end of the code wheel 6, and the photosensitive tube 8 is located at the other end of the code wheel 6. The code disk 6 is printed with X signal lines with equal angles, the code disk 6 transmits light and the signal lines do not transmit light, the light is blocked at the signal lines, and the light passes through the code disk 6 to irradiate the photosensitive tube 8 at the other end at the transparent position of the code disk 6.

As shown in fig. 3, the principle of implementing the pulse measurement of the volume tube generally includes: the grating encoder 1 is installed in flowmeter pivot 2, X opaque signal lines (as shown in figure 2) have been printed on grating encoder 1 printing opacity's code wheel 6, and when flowmeter 3 during operation, flowmeter pivot 2 drive code wheel 6 is rotatory, and light source 7 sends continuous light irradiation on code wheel 6 in one side of code wheel 6, along with the light irradiation on code wheel 6, the light passes through the code wheel and transmits the photosensitive tube 8 region of the other end, and when the light irradiation on the signal line, photosensitive tube 8 can not receive the optical signal. When the light is alternately changed, the light-sensitive tube 8 outputs periodic pulse signals, and a signal line and a section of light-transmitting code disc correspond to a high level and a low level of the pulse signals. Therefore, the inventors of the present application considered that the number of signal lines should be larger than the number of pulses output from the flowmeter 3 itself to have the effect of increasing the number of pulses of the flowmeter at the time of verification. When the volume tube 9 calibrates the flow meter 3, the number of pulses N acquired by the flow meter 3 is determined by the flow meter coefficient k (in P/L) and the volume tube standard volume value v, namely: n=kv. The code wheel 6 rotates along with the flowmeter rotating shaft 2 for one circle to output a fixed pulse number, and the pulse number is determined by the number of signal lines on the code wheel 6. And the level of meter accuracy i determines the maximum pulse error M that can be received by the calibrated meter 3, namely: m=n×i. Thus, the inventors believe that the number of signal lines X on the code wheel 6 is required to meet the error of no more than M when the volume tube 9 is calibrating the flow meter 3.

When the volume tube 9 calibrates the flowmeter 3, the counter can only record the complete pulse signal (such as square wave signal) after calibration is started, that is, even if the flowmeter 3 can output a large number of pulses, a certain error exists, therefore, the embodiment of the application proposes to further improve the measurement accuracy by using the double-time pulse counting method. In the embodiment of the application, the double-time pulse counting method is to measure two time amounts of the piston travel time and the flowmeter pulse time when the volumetric tube 9 calibrates the flowmeter 3, and correct the original pulse number by the ratio of the two time amounts, so as to obtain the pulse number obtained by the flowmeter 3 in the starting and stopping time. Thus, by performing the double time pulse method correction based on the grating encoder 1, the flow meter pulse accuracy is improved to the maximum.

Fig. 4 is a flow chart of a method for implementing volumetric tube pulse measurement in an embodiment of the present application, which is applicable to a case of calibrating a large-caliber flowmeter with a volumetric tube having a small standard volume value, and as shown in fig. 4, in a process of calibrating the volumetric tube flowmeter, the method includes:

step 400: a first time length T is taken for a piston within the volume tube to pass through a start verification position sensor and an end verification position sensor.

In one illustrative example, step 400 may include:

when the piston trigger starting verification position sensor in the volume tube is detected, a first timer is started, and when the piston trigger ending verification position sensor is detected, the first timer is stopped, and a first time length T is obtained according to the timing result of the first timer.

In step 400, as shown in connection with fig. 3, the length of time that the piston passes the start calibration position sensor and the end calibration position sensor, i.e., the first time length T, is accurately measured by the first timer.

Step 401: the complete number of pulses N1 and its corresponding second time period T1 during which the piston passes the start calibration position sensor and the end calibration position sensor are obtained.

In one illustrative example, step 401 may include:

after detecting that the piston triggers the starting verification position sensor, when a pulse signal sent by the grating encoder reaches a first level, starting a counter to start counting the complete pulse number N1, and starting a second timer; after detecting that the piston triggers the end verification position sensor, when a pulse signal sent by the grating encoder reaches a first level, the counter is closed to stop counting the complete pulse number N1, the second timer is stopped, and a second duration T1 is obtained according to a timing result of the second timer.

In one illustrative example, as shown in connection with fig. 3, the first level may be a high level.

Through step 401, as shown in fig. 3, the complete pulse number N1 during the period when the piston passes through the start verification position sensor and the end verification position sensor is accurately measured, and the pulse duration corresponding to the complete pulse number N1, that is, the second duration T1, is measured through the second timer.

Step 402: and correcting the complete pulse number N1 according to the first time length T and the second time length T1 to obtain the pulse number N of the volume tube pulse measurement.

In one example row instance, step 402 may include: as shown in equation (1), the number of pulses N measured by the volume tube pulses is equal to the product of the number of complete pulses N1 during the piston passes through the start verification position sensor and the end verification position sensor, and the ratio of the first time period T and the second time period T1.

In the embodiment of the application, by a double-time pulse counting method, when the flowmeter is calibrated by the volume pipe, the first time length of the piston passing through the start verification position sensor and the end verification position sensor and the second time length T1 corresponding to the complete pulse number N1 and the pulse number N1 during the piston passing through the start verification position sensor and the end verification position sensor are accurately measured. The timer begins to count T when the piston passes the start verification position sensor. Therefore, although the counter can only record the complete pulse signals during the period that the piston passes through the start verification position sensor and the end verification position sensor, the original complete pulse number is corrected through double-time pulse counting in the embodiment of the application, so that the accurate pulse number obtained by the flowmeter in the starting time is obtained, and the pulse accuracy of the flowmeter is improved to the greatest extent.

According to the method for realizing the pulse measurement of the volume tube, on one hand, through the grating encoder, the pulse number output by the volume tube with the small standard tube section when the large-caliber flowmeter is calibrated is increased, so that the pulse measurement precision is improved; on the other hand, by the double-time pulse counting method, the problem that the flowmeter can only record complete pulse signals is solved, and the pulse measurement accuracy is further improved.

The present application also provides a computer readable storage medium storing computer executable instructions for performing the method of implementing volumetric tube pulse measurement of any of the above.

The application further provides a device for realizing volume tube pulse measurement, which comprises a memory and a processor, wherein the memory stores the following instructions executable by the processor: a step for performing the method of implementing volumetric tube pulse measurement of any of the above claims.

Although the embodiments disclosed in the present application are described above, the embodiments are only used for facilitating understanding of the present application, and are not intended to limit the present application. Any person skilled in the art to which this application pertains will be able to make any modifications and variations in form and detail of implementation without departing from the spirit and scope of the disclosure, but the scope of the application is still subject to the scope of the claims appended hereto.

Claims

1. A method for implementing impulse measurement of a volume tube, suitable for use in calibrating a large caliber flow meter with a volume tube having a small standard volume value, comprising:

2. The method of claim 1, wherein the acquiring a first duration for a piston within the volume tube to pass a start calibration position sensor and an end calibration position sensor comprises:

3. The method of claim 1, wherein the acquiring the complete number of pulses and their corresponding second durations during the piston passing the start and end calibration position sensors comprises:

4. A method according to claim 3, wherein the first level is a high level.

5. The method of any one of claims 1-4, wherein said correcting the complete pulse count according to the first duration and the second duration to obtain the pulse count of the volumetric tube pulse measurement comprises:

6. A computer readable storage medium storing computer executable instructions for performing the method of implementing volumetric tube pulse measurement of any one of claims 1-5.

7. An apparatus for performing volumetric tube pulse measurements, comprising a memory and a processor, wherein the memory has stored therein instructions executable by the processor to: a step for performing the method of implementing volumetric tube pulse measurement of any one of claims 1 to 5.