| 摘要 |
<p>A press type liquid pump comprises a pressure head (10), a plunger (50), an upper one-way valve (40), a liquid storage tank (30) and a lower one-way valve (80). The pressure head (10) is connected with the plunger (50). The lower one-way valve (80) is installed at the bottom of the liquid storage tank (30). The pressure head (10) and the plunger (50) form a distribution channel of a liquid product together. A volume change device is provided at the bottom of the pressure head (10) or the plunger (50). The volume of the distribution channel is reduced during the process that the pressure head (10) is pressed downwards and is restored the original state of the volume after the downward pressing action is withdrawn. The liquid pump can effectively prevent the residual liquid product inside the distribution channel from dropping from an outlet portion of the pressure head.</p> |
