Gas control valve device of revolution film type fuel gas meter

Abstract

The invention relates to a gas control valve device of a revolution film type fuel gas meter. The gas control valve device comprises a valve seat which is hermetically fixed with a core shell, a valve cover which is rotatably matched on the valve seat, a positioning piece, a transmission piece and a gear bracket which is arranged on the core shell, wherein the transmission piece consists of a transmission gear, transmission shafts which are arranged at both ends of the transmission gear and are eccentric with the transmission gear and a shifting shaft; and the shifting shaft is positioned in a shifting groove of the valve cover. The gas control valve device is characterized in that the valve cover is provided with a positioning sinkhole; an upper bracket body of the gear bracket is provided with a positioning through hole; the positioning piece consists of a first positioning shaft and a second positioning shaft between the transmission gear and the shifting shaft and sequentially coaxial with the transmission gear, wherein the first positioning shaft is matched in the positioning through hole of the gear bracket, and the lower end of the first positioning shaft is axially limited facing to the valve cover; the second positioning shaft is assembled in the positioning sinkhole of the valve cover, and the valve cover rotates around the second positioning shaft and is radially positioned by the second positioning shaft. The gas control valve device has simple structure, easy part processing and high measuring precision of the fuel gas meter.

Description

technical field [0001] The invention relates to a gate valve or slide valve with a rotary closing element and a flat sealing surface, especially a gas control valve device suitable for a rotary membrane gas meter. Background technique [0002] As we all know, the core part of the diaphragm gas meter is composed of a core housing, a diaphragm metering chamber, an air control valve device, and a connecting rod gear transmission mechanism. components. The membrane gas meter is divided into a sliding membrane gas meter and a rotary membrane gas meter according to the difference in the relative motion between the valve cover and the valve seat. The valve seat of the rotary membrane gas meter is sealed and fixed on the core body, and the valve cover is positioned on the valve seat by the positioning part, and is driven by the transmission part to make a rotary motion on the valve seat, and the diaphragm metering is continuously realized. chamber intake and exhaust. Based on the...

AI Technical Summary

Problems solved by technology

However, in the above schemes, the central shaft is fixedly installed in the core housing, and the transmission part (shaft sleeve or sleeve of the central eccentric gear) is inserted in the central hole of the valve cover and sleeved on the central shaft. Above, the valve cover is rotated and fitted on the valve seat, and rotates around the central axis together with the transmission part. The central axis plays the role of connecting the positioning core shell, the valve seat and the valve cover, so that the axial length of the central axis is too long , the central axis of this structure tends to be skewed in the process of fixing the core shell, which causes the valve cover to tilt, thus affecting the measurement accuracy of the gas meter, and the core shell and the valve cover must be made respectively The positioning boss of the central axis increases the difficulty of the process; at the same time, the positioning boss occupies the cross-sectional area of ​​the gas channel and increases the pressure loss of the gas meter

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