Direct drive group and its assembly method

Abstract

The invention discloses a direct transmission group, which is characterized in that: it comprises a transmission shaft, a shaft sleeve, a dynamic sealing structure, a connecting piece and a lever; the transmission shaft is rotatably inserted into the shaft sleeve; the transmission input end of the transmission shaft is fixed A toggle lever is provided, and the toggle lever has a toggle portion that protrudes outward along the radial direction of the transmission shaft; the transmission output end of the transmission shaft is coaxially fixed with a connecting piece; the inner part of the shaft sleeve is provided with a dynamic sealing structure at the position close to the transmission input end, and the shaft The outer surface of the sleeve is provided with a shaft sleeve assembling and fixing structure. The invention also discloses an assembling method of the direct transmission group. The direct transmission group of the present invention has the advantages of less components, anti-magnetic interference, smaller size, compactness and reliability. The direct transmission group assembling method of the present invention is characterized in that the connecting piece, the shaft sleeve, the dynamic sealing structure, the transmission shaft and the lever are sequentially loaded from bottom to top during assembly. The direct drive group assembling method of the present invention is convenient for using an assembling device to automate assembly production, improves the production efficiency of the product, and reduces the production cost.

Description

technical field [0001] The invention belongs to the field of gas meters, and in particular relates to a direct transmission group used in a gas meter and an assembling method thereof. Background technique [0002] The diaphragm gas meter is mainly composed of a metering part (including two metering boxes with flexible diaphragms inside), a transmission part (including a diaphragm, a folding plate, a vertical shaft, a rocker arm, a connecting rod, a crank, a shift fork and a valve cover) ), counting part and shell. [0003] The working principle of the diaphragm gas meter is as follows: a diaphragm (usually made of synthetic rubber) is installed at the center line of each metering box, and the diaphragm divides the inside of the metering box into two metering gas chambers. After the gas enters the gas meter, it alternately enters the two metering gas chambers of each metering box, so that the diaphragm (and the diaphragm sandwiched on the diaphragm) reciprocates, and then th...

AI Technical Summary

Problems solved by technology

[0005] The magnetic transmission device drives the rotation of the inner magnetic sleeve through the rotation of the outer magnetic sleeve, thereby outputting the rotational kinetic energy to the outside. However, the magnetic transmission device has many components, and the assembly and transmission between the components are more complicated. The magnetic sleeve is placed on the outside of the inner magnetic sleeve, so it still has the disadvantages of heavy weight, large volume, and difficulty in miniaturization. At the same time, because the outer magnetic sleeve and the inner magnetic sleeve are magnets, they are not resistant to strong magnetic interference and are prone to appear in a magnetic environment. The transmission accuracy is poor; moreover, it is easy to cause errors in the instrument measurement due to the artificial magnetic environment (air stealing phenomenon)

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