Water meter character wheel bin

The utility model provides a water meter character wheel bin which comprises a bin body, purified water is filled in the bin body, a piston cavity communicated with the bin body is arranged on one side of the bin body, the section of the piston cavity is designed to be in an inverted-T shape, internal threads are arranged at the bottom of the piston cavity, a hollow threaded plug is sleeved on the internal threads, and the hollow threaded plug is connected with the bin body. A piston assembly which is pushed towards the interior of the piston cavity in a one-way mode is arranged in the piston cavity and comprises a piston and an elastic spring, the section of the piston is also in an inverted-T shape, the piston is arranged in cooperation with the piston cavity, and the lower end face of the piston is attached to the upper end face of the hollow threaded plug. According to the utility model, the piston assembly is used for compressing the gas in the bin body to enable the gas to be consistent with or close to