Calorific value corrected membrane gas meter

Abstract

The invention discloses a heat value correction type diaphragm gas metering device which comprises a diaphragm capsule (1) and a gas distributing valve bank, wherein the diaphragm capsule (1) comprises at least two metering chambers (2), and each metering chamber (2) is divided into two independent metering cavities by a leathern diaphragm (3); the gas distributing valve bank comprises a gas distributing valve seat and a distributing valve deck (4), and the gas distributing valve seat and the distributing valve deck (4) are respectively provided with an gas inlet / outlet and a closing port; and through volute spiral springs made of different metal precision alloy materials in two thermal expansion systems, a crank block is driven to slide in a sliding rail on a center wheel so as to changethe radius of a crank when the temperature increases or decreases, thereby changing the motion track of a leathern diaphragm clamping plate driven by a crank-link mechanism and then changing the stretching size of the leathern diaphragm. The heat value correction type diaphragm gas meter disclosed by the invention is simple in structure, and can be prepared through directly modifying the existingstructured diaphragm gas meter; and meanwhile, the heat value correction type diaphragm gas meter is suitable for industrial production and easy to generalize.

Description

technical field [0001] The invention relates to a membrane gas meter, in particular to a calorific value corrected membrane gas meter. Background technique [0002] Membrane gas meter is a widely used gas meter. It has the advantages of high measurement accuracy, wide range, stable performance, easy process control, and high cost performance. However, the verification of existing membrane gas meters is at a constant temperature of 20 ± It is completed at 2°C, and the specified transaction temperature is also this temperature. However, the working environment temperature of the actual gas meter is constantly changing, so the gas consumption volume displayed by the gas meter is not necessarily the same even if the calorific value is the same, resulting in the uncertainty of the calorific value measurement of the membrane gas meter. Therefore, the traditional mechanical membrane gas meter has been gradually replaced by the electronic gas meter. The electronic gas meter is accu...

AI Technical Summary

Problems solved by technology

However, the working environment temperature of the actual gas meter is constantly changing, so the gas consumption volume displayed by the gas meter is not necessarily the same even if the calorific value is the same, resulting in the uncertainty of the calorific value measurement of the membrane gas meter. Therefore, the traditional mechanical membrane gas meter has been gradually replaced by the electronic gas meter. The electronic gas meter is accurate in measurement and relatively intelligent in actual use, which can meet the daily gas demand. However, the manufacturing cost of the electronic gas meter Higher, so it has some obstacles to its popularization

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