CN112729488A

CN112729488A - Water inlet detection method for ultrasonic gas meter

Info

Publication number: CN112729488A
Application number: CN202011609575.5A
Authority: CN
Inventors: 白璐; 徐剑; 李季
Original assignee: Zhejiang Viewshine Intelligent Meter Co Ltd
Current assignee: Zhejiang Viewshine Intelligent Meter Co Ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-04-30

Abstract

The invention discloses a water inlet detection method for an ultrasonic gas meter. Firstly, calculating the flight time between an upstream ultrasonic transducer and a downstream ultrasonic transducer through a UMU sensor module, and sending the flight time to a water inlet detection module arranged in a gas meter main control board; the water inlet detection module calculates the flight time difference between the upstream ultrasonic transducer and the downstream ultrasonic transducer according to the flight time; when the flight time difference exceeds a set flight time difference threshold value and the flight time is reduced, water inflow exists in the gas meter, the water inflow detection module controls the ultrasonic gas meter to give an alarm, a user is reminded, and the alarm is reported to the upper platform. The method of the invention fully utilizes the transient of the UMU sensor in the flying time after water inflow to judge that the meter has the function of water inflow detection, and is safe and reliable, and the cost is saved. The method of the invention judges the condition of the medium in the gauge based on the time difference of flight, and the time difference method has smaller error caused by the change of the sound velocity along with the temperature of the fluid and higher accuracy.

Description

Water inlet detection method for ultrasonic gas meter

Technical Field

The invention belongs to the field of safety detection of gas meters, and particularly relates to an ultrasonic gas meter water inlet detection method.

Background

The ultrasonic gas meter has better sealing performance, but water can enter the gas meter due to corrosion or artificial damage of the installation position, the pipeline environment and the long-time environment, the metering accuracy of the gas meter can be influenced due to the water entering the gas meter, and the gas meter can be damaged.

When the ultrasonic gas meter is used, condensed water in a gas pipeline or other reasons can cause water to enter the gas meter, and the water entering is less, so that the data detection error of a metering module can be caused, the metering accuracy of the gas meter is influenced, and the benefits of users and gas companies are influenced; if the water inflow is too much, the gas meter can not work normally. The existing electronic gas meter does not detect the water inlet condition, so that the water inlet condition cannot be found and processed in time.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides an ultrasonic gas meter water inlet detection method. The working principle of the ultrasonic gas meter is that the ultrasonic gas meter measures the gas flow rate by adopting the time difference method principle, and the flow rate of the fluid is reflected by measuring the difference of the forward flow and the backward flow propagation time speeds of ultrasonic signals in the fluid. The method is based on the UMU sensor module of the ultrasonic gas meter, and whether the ultrasonic gas meter is supplied with water or not is detected by detecting the flight time difference of ultrasonic waves.

An ultrasonic gas meter water inlet detection method comprises the following steps:

and (1) calculating the time of sending an ultrasonic signal to a downstream ultrasonic transducer by an upstream ultrasonic transducer, namely the flight time Tup, and the time of returning a signal to an upstream transducer by a downstream ultrasonic transducer, namely the flight time Tdown, through a UMU sensor module, and sending the time to a water inlet detection module arranged in a gas meter main control board.

The water inlet detection module in the step (2) receives the flight time Tup and the flight time Tdown sent by the UMU sensor module in real time; and calculating the difference value between the time of sending the ultrasonic signal to the downstream ultrasonic transducer by the upstream ultrasonic transducer and the time of returning the signal to the upstream transducer by the downstream ultrasonic transducer.

And (3) when water enters the ultrasonic gas meter, the flight time difference between the flight time Tup and the flight time Tdown can change instantly, when the flight time difference exceeds a set flight time difference threshold value and the flight time calculated by the UMU sensor module is reduced, water enters the gas meter, and the water inlet detection module controls the ultrasonic gas meter to alarm to remind a user and inform the user to an upper platform.

The invention has the following beneficial effects:

the method does not need a related water quality sensor, fully utilizes transient Tup and Tdown of the UMU sensor after water inlet, judges the function of water inlet detection of the meter, and is safe, reliable and cost-saving.

The ultrasonic gas meter has a water inlet alarm function, when water enters the meter, the UMU module is released to transmit a meter water inlet mark to a meter main control board, the meter generates a water inlet alarm signal, and the water inlet condition is reported to the upper platform.

The method of the invention judges the condition of the medium in the gauge based on the time difference of flight, and the time difference method has smaller error caused by the change of the sound velocity along with the temperature of the fluid and higher accuracy.

Drawings

Fig. 1 is a diagram of the upper software detection of UMU4 according to the present invention.

Detailed Description

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

As shown in fig. 1, when water is not fed into the UMU sensor module, the flight times Tup and Tdown are stable and greater than 17 μ a, and the curve in the UMU4 upper software is basically stable and unchanged; when water starts to enter the edge of the UMU sensor module, a flight time curve in UMU4 upper software is transient, the flight time difference is obvious, and when the flight time difference disappears, the flight times Tup and Tdown are obviously reduced.

Claims

1. An ultrasonic gas meter water inlet detection method is characterized by comprising the following steps:

calculating the time of sending an ultrasonic signal to a downstream ultrasonic transducer by an upstream ultrasonic transducer, namely the flight time Tup, and the time of returning a signal to an upstream transducer by a downstream ultrasonic transducer, namely the flight time Tdown, by using a UMU sensor module, and sending the time to a water inlet detection module arranged in a gas meter main control board;

the water inlet detection module in the step (2) receives the flight time Tup and the flight time Tdown sent by the UMU sensor module in real time; calculating the difference value between the time of sending an ultrasonic signal to the downstream ultrasonic transducer by the upstream ultrasonic transducer and the time of returning the signal to the upstream sensor by the downstream ultrasonic transducer;