N-type through-shot single-pass single-flow channel of gas flow meter

Abstract

The invention provides an N-type single-pass single-flow channel for a gas flow meter. The cross-section of the gas flow channel is a rectangular structure; on both sides of the gas flow channel, there are first and second ultrasonic installation holes. It is suitable for installing the ultrasonic transmitting and receiving device; the first ultrasonic installation hole and the second ultrasonic installation hole are inclined to the middle part of the gas flow channel, and the angle between the center line and the vertical direction is equal; the ultrasonic wave in the gas flow channel After two reflections respectively, an N-type walking path is formed. The flow channel of the present invention reduces the volume of the gas meter, greatly reduces the space, and reduces the cost of transportation and storage; the ultrasonic wave is reflected twice in the flow channel, which increases the stroke of the ultrasonic wave in the pipeline and increases the difference between T1 and T2 value, to obtain higher measurement accuracy; because the concave arc groove has the function of gathering waves, it is guaranteed that most of the ultrasonic waves can be received after reflection, which improves the measurement accuracy and increases the accuracy of measurement.

Description

technical field [0001] The invention relates to an accessory part of a gas flow meter, in particular to an N-type cross-shot single-pass single flow channel of a small household gas flow meter. Background technique [0002] The gas flow meter (gas meter) is a measuring instrument for measuring the volume of gas. It has the function of automatically accumulating the volume, so that those who use natural gas or piped gas can easily know how much gas they have used, so that they can calculate the amount of gas on a monthly basis. Pay for the cubic meters of gas consumed. [0003] The gas meters in the prior art are small in size for household use, such as G1.6, G2.5, G4 and other meters; because they are used for household use, they are required to be small in size so that they occupy a small area and are convenient for home layout. . In the current technology, a new generation of ultrasonic meters has emerged. The measurement principle is: two sets of ultrasonic transmitting...

AI Technical Summary

Problems solved by technology

[0004] However, the ultrasonic meter currently in the experimental stage is still relatively large due to the limitation of the structure and parameters of the flow channel for collecting gas parameters. For example, some foreign manufacturers use N-type or N-type pipes, which require high processing accuracy. , a slight deviation will have an impact on the measurement results, and at present, these two types of pipelines are relatively large in size and high in cost

In order to improve the measurement accuracy, it is necessary to increase the stroke (distance) of the ultrasonic wave in the pipeline to increase the difference between T1 and T2 and obtain higher measurement accuracy; The flow channel, or adding multi-layer partitions in the flow channel, will increase the cost of the flow channel, increase the gas meter assembly process, and if one layer of partition is damaged, it will seriously affect the measurement accuracy

For a small domestic gas meter with a small volume, it is more difficult to increase the stroke (distance) of the ultrasonic wave in the pipeline under the condition of a certain volume; Increasing the stroke of the ultrasonic wave in the pipeline will have high requirements on the part of the channel wall that reflects the ultrasonic wave, which increases the difficulty of manufacturing and processing; moreover, during the use of the gas meter, fine particles, dust, dust, etc. in the gas Adhering to the ultrasonic reflection part on the flow channel wall will change the reflection path of the ultrasonic wave, and a small part or even a large part of the ultrasonic wave cannot be reflected to the receiving range of the receiver and cannot be received; in addition, even if the aforementioned Process requirements, because the ultrasonic wave has to be reflected more than once in the flow channel, and a large part of the ultrasonic wave exceeds the receiving range of the receiver after reflection and cannot be received, which also affects the measurement accuracy and reduces the accuracy of the measurement

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