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一、洗衣机内封闭空气的压强全自动洗衣机中的水位开关是一个压力开关,它是利用开关内的空气随着水位上升所增加的压力来关闭水阀,在排水时,随着水位的下降,空气室内的压力随之下降,开关回复到初始位置.如图所示,当水被注入洗衣桶后,其中的空气很快被封闭在左侧的小管中,随着水位的上升,被封闭的空气的压强将增大.已知桶内外液面差h的范围为15—35cm.
1. The pressure of the closed air inside the washing machine The water level switch in the fully automatic washing machine is a pressure switch. It uses the air in the switch to increase the pressure as the water level rises to close the water valve. When the water is drained, the water level decreases. The pressure in the air chamber drops, and the switch returns to its initial position. As shown in the figure, when water is injected into the wash tub, the air therein is quickly trapped in the small tube on the left side, and the water is closed as the water level rises. The pressure of the air will increase. The known difference between the liquid inside and outside the barrel is in the range of 15-35 cm.