Pre-filter

A pre-filter is characterized in that the pre-filter comprises a water passing part, a filtering part and a locking part, the filtering part is communicated with the water passing part through a check valve, an action ring is arranged between the filtering part and the check valve, the action ring is provided with a valve rod and a guide rod, the valve rod drives a valve element of a water inlet valve to move, and the guide rod moves along a guide groove; the locking part is meshed with the movable rack through the rotating gear, so that the filtering part is driven to move up and down, separation and combination of the filtering part and the water passing part are realized, and meanwhile, the filtering part drives the action ring to move. The filter part is convenient to disassemble and assemble, and the filter element is convenient to replace. 一种前置过滤器，其特征在于：包括通水部、过滤部及锁紧部，过滤部与通水部通过止回阀连通，过滤部与止回阀之间设置动作环，动作环设置阀杆及导杆，阀杆带动进水阀阀芯移动，导杆沿导槽移动；锁紧部通过转动齿轮与移动齿条啮合，从而带动过滤部上下移动，实现过滤部与通水部的分离与结合，同时实现过滤部带动动作环的运动。实现过滤部便捷拆装，方便更换滤芯