CN110864772A - Method for detecting instantaneous flow of electronic gas meter - Google Patents

Abstract

The invention provides an instantaneous flow detection method for an electronic gas meter. Firstly, adding a 485 communication module on the existing sonic nozzle meter detection equipment, wherein the 485 communication module is used for systematically reading the current average flow of the electronic gas meter; an external communication interface is added to the electronic gas meter hardware. Then configuring flow points and idle running time to be detected, setting the gas meter into a meter detection mode, and opening a sonic nozzle corresponding to the air compressor and the flow points to be detected; after the idle running time is over, the average flow Q of the stable sonic nozzle is calculated_Sound(ii) a Meanwhile, the average flow Q stored by the mainboard of the electronic gas meter of each station is read through the 485 module_{Watch (A)}. And finally, calculating to obtain the error of the electronic gas meter. The method provided by the invention ensures the meter checking accuracy, and improves the efficiency by about 2 times compared with the traditional cumulant meter checking method.

Description

Method for detecting instantaneous flow of electronic gas meter

Technical Field

The invention belongs to the technical field of intelligent control of instruments, and particularly relates to an electronic gas meter instantaneous flow detection method.

Background

With the continuous development of the technology, the metering method in the gas industry is also continuously evolved and innovated, the traditional gas meter has a metering mode called as 'positive displacement' such as a diaphragm, a turbine, Roots and the like, and is specifically realized by a mechanical roller, the mechanical roller is additionally operated according to the used gas amount, the counting of the roller is increased by one when one unit is used, and the gas amount metering record is finally realized. The mechanical diaphragm gas meter has the advantages of mature technology, reliable metering and stable quality, but has the defects of complex structure, inaccurate metering caused by aging of a diaphragm along with the prolonging of the service time and the like.

Compared with the prior mechanical meter, the electronic gas meter has the advantages of no comparability in mechanical noise, precision, measuring range, repeatability, service life and maintenance due to the characteristics of a full electronic structure. Therefore, the electronic gas meter is a trend of the measurement direction development of the future gas meter industry.

An electronic gas meter generally collects flow data in samples in the meter, multiplies the flow data by a sampling period, and finally calculates gas consumption, and the gas meter is called a velocity type electronic gas meter, such as an ultrasonic gas meter, a sonic gas meter, and the like.

The metering basis of the speed type gas meter is flow, which is consistent with the basis of the sound velocity nozzle detection equipment widely used at present, so that the flow data of the speed type gas meter and the flow data of the sound velocity nozzle detection equipment can be directly compared during detection, a traditional cumulant comparison method is not needed, the whole meter detection process does not need to be operated for a long time, the meter detection quality can still be ensured, and the meter detection efficiency is greatly improved.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides an electronic gas meter instantaneous flow detection method.

An electronic gas meter instantaneous flow detection method specifically comprises the following steps:

adding a 485 communication module on the existing sonic nozzle meter detection equipment, wherein the 485 communication module is used for reading the current average flow of the electronic gas meter by a system; an external communication interface is added to the electronic gas meter hardware.

Step (2), configuring flow points and idle running time to be verified, and setting the gas meter into a meter detection mode; the electronic gas meter collects the instantaneous flow Q of the meter according to a fixed period T (T is less than or equal to 500ms)₁、Q₂、Q₃……Q_NAnd storing the average value Q in an array containing N elements, and returning the average value Q of the N elements when the average value Q is read by a 485 module_{Watch (A)}

In the meter checking mode, the acquisition frequency of the instantaneous flow is accelerated, and the electronic gas meter mainboard updates the average value Q meter to be returned in real time.

Step (3), opening a sonic nozzle corresponding to the air compressor and the flow point to be detected;

and (3) turning on the air compressor through the PC host to generate negative pressure flow, and simultaneously turning on the sonic nozzle corresponding to the flow point to be detected.

Step (4) after the idle running time is over, calculating the average flow Q of the stable sonic nozzle_Sound(ii) a Meanwhile, the average flow Q stored by the mainboard of the electronic gas meter of each station is read through the 485 module_{Watch (A)}。

Mean flow rate Q_SoundThe calculation method is as follows: after the sonic nozzle is stabilized, respectively collecting real-time flow Q1, Q2 and Q3 … … qn generated by n sonic nozzles according to a fixed period t (t is less than or equal to 1s), and calculating an average value to obtain an average flow Q_Sound

Step (5), obtaining the error of the electronic gas meter through calculation, wherein the formula is as follows;

the external communication interface can be selected from a hard serial port, a photoelectric communication interface, an infrared communication interface and a wireless communication interface.

The invention has the following beneficial effects:

1. the method provides a quick and reliable meter checking method for the electronic gas meter.

2. The method ensures the accuracy of the table checking, and improves the efficiency by about 2 times compared with the traditional cumulant table checking method.

Drawings

FIG. 1 is a schematic view of a light sensitive diode added to a motherboard according to an embodiment of the present invention;

fig. 2 is a schematic diagram illustrating a position of a 485 communication module on an equipment rack according to an embodiment of the present invention;

fig. 3 is a structure diagram of a 485 communication module according to an embodiment of the invention.

Detailed Description

The invention is further illustrated with reference to the figures and examples.

An electronic gas meter instantaneous flow detection method specifically comprises the following steps:

as shown in fig. 1 and fig. 3, in step (1), adding a 485 communication module to an existing sonic nozzle meter detection device, wherein the 485 communication module is used for systematically reading the current average flow of an electronic gas meter; an external communication interface is added to the electronic gas meter hardware.

Fig. 2 is a schematic diagram illustrating a position of a 485 communication module on an equipment rack according to an embodiment of the present invention;

step (2), configuring flow points and idle running time to be verified, and setting the gas meter into a meter detection mode; the electronic gas meter collects the instantaneous flow Q of the meter according to a fixed period T (T is less than or equal to 500ms)₁、Q₂、Q₃……Q_NAnd storing the average value Q in an array containing N elements, and returning the average value Q of the N elements when the average value Q is read by a 485 module_{Watch (A)}

In the meter checking mode, the acquisition frequency of the instantaneous flow is accelerated, and the electronic gas meter mainboard updates the average value Q meter to be returned in real time.

Step (3), opening a sonic nozzle corresponding to the air compressor and the flow point to be detected;

and (3) turning on the air compressor through the PC host to generate negative pressure flow, and simultaneously turning on the sonic nozzle corresponding to the flow point to be detected.

Step (4) after the idle running time is over, calculating the average flow Q of the stable sonic nozzle_Sound(ii) a Meanwhile, the average flow Q stored by the mainboard of the electronic gas meter of each station is read through the 485 module_{Watch (A)}。

Mean flow rate Q_SoundThe calculation method is as follows: after the sonic nozzle is stabilized, according to the fixationRespectively collecting real-time flow Q1, Q2 and Q3 … … qn generated by n sonic nozzles in a period t (t is less than or equal to 1s), and calculating an average value to obtain an average flow Q_Sound

Step (5), obtaining the error of the electronic gas meter through calculation, wherein the formula is as follows;

the external communication interface can be a hard serial port, a photoelectric communication interface, an infrared communication interface and a wireless communication interface, and the photoelectric communication interface is adopted in the embodiment.

Claims (2)

1. An electronic gas meter instantaneous flow detection method is characterized by comprising the following specific steps:

adding a 485 communication module on the existing sonic nozzle meter detection equipment, wherein the 485 communication module is used for reading the current average flow of the electronic gas meter by a system; adding an external communication interface in electronic gas meter hardware;

step (2), configuring flow points and idle running time to be verified, and setting the gas meter into a meter detection mode; the electronic gas meter collects the instantaneous flow Q of the meter according to a fixed period T (T is less than or equal to 500ms)₁、Q₂、Q₃……Q_NAnd storing the average value Q in an array containing N elements, and returning the average value Q of the N elements when the average value Q is read by a 485 module_{Watch (A)}

Under the meter checking mode, the acquisition frequency of the instantaneous flow is accelerated, and the host board of the electronic gas meter updates the average value Q meter to be returned in real time;

step (3), opening a sonic nozzle corresponding to the air compressor and the flow point to be detected;

opening an air compressor through a PC host to generate negative pressure flow, and simultaneously opening a sonic nozzle corresponding to a flow point to be detected;

step (4) after the idle running time is over, calculating the average flow Q of the stable sonic nozzle_Sound(ii) a Meanwhile, the average flow Q stored by the mainboard of the electronic gas meter of each station is read through the 485 module_{Watch (A)}；

Mean flow rate Q_SoundThe calculation method is as follows: after the sonic nozzle is stabilized, respectively collecting real-time flow Q1, Q2 and Q3 … … qn generated by n sonic nozzles according to a fixed period t (t is less than or equal to 1s), and calculating an average value to obtain an average flow Q_Sound

Step (5), obtaining the error of the electronic gas meter through calculation, wherein the formula is as follows;

2. the method for detecting the instantaneous flow of the electronic gas meter according to claim 1, wherein the external communication interface can be a hard serial port, a photoelectric communication interface, an infrared communication interface or a wireless communication interface.

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