本实用新型提供了一种当滤芯中杂质增多时，能及时发出响声，提示工作人员更换清洗滤芯的带蜂鸣器的过滤器。
The utility model provides the filter with the buzzer for sending the sound in time when impurities in a filter core are increased so as to promote work stuff to replace or clean the filter core.
若在规定的时间内无人抢答，则系统中的蜂鸣器将发响，提示主持人本轮抢答无效，实现报警功能。
If nobody answer the question on time, the alarm will give out some sound, helping the host know the race in this turn is of no use, so the function of alarming is achieved.
若在规定的时间内无人抢答，则系统中的蜂鸣器将发响，提示主持人本轮抢答无效，实现报警功能。
If nobody answer the question on time, the alarm will give out some sound, helping the host know the race in this turn is of no use, so the function of alarming is achieved.
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