Acceleration method for negative pressure liquid seal of dial plate of wet type water meter

The invention discloses an acceleration method for negative pressure liquid seal of a dial plate of a wet type water meter, the negative pressure liquid seal of the dial plate comprises a liquid seal box and a vacuum pump, the vacuum pump is communicated with the liquid seal box through a pipeline, and the liquid seal box is provided with a pressure gauge, a negative pressure control valve corresponding to the vacuum pump and a ventilation control valve corresponding to the outside. The dial plate negative pressure liquid sealing acceleration method comprises the following steps that feeding preparation is conducted before liquid sealing, specifically, a preset water body subjected to exhaust treatment is arranged in a liquid sealing box, and a wet-type water meter is placed in the liquid sealing box; the sealed liquid seal box is vacuumized, a ventilation control valve is closed, a negative pressure control valve is opened, a vacuum pump is started to achieve vacuumizing in the liquid seal box, and meanwhile