| 摘要 |
An oil returning structure comprises a base (1), a control switch, a first blocking bead (2) located in the base (1), and an elastic element (3) mounted between the first blocking bead (2) and the base (1). The base (1) is provided with a liquid storage cavity (11), a liquid returning cavity (12), a communication cavity (13), a first communication opening (14) communicated between the liquid returning cavity (12) and the communication cavity (13), and a second communication opening communicated between the communication cavity (13) and the liquid storage cavity (11). The control switch is used for controlling the opening and closing of the second communication opening so that the communication cavity (13) and the liquid storage cavity (11) are in a communicated or blocked state. The first blocking bead (2) can move between a blocked position and an opened position. The first communication opening (14) is disposed in a communication opening portion of the base (1). When the first blocking bead (2) is located in the blocked position, the first blocking bead (2) blocks the partial area of the first communication opening (14) to form a liquid passing gap (15) with the inner wall of the communication opening portion, and the liquid passing gap (15) is communicated with the liquid returning cavity (12) and the communication cavity (13). The oil returning structure has a simple structure, which helps to reduce manufacturing costs, and can change the speed of a liquid flowing from the liquid returning cavity (12) to the communication cavity (13). |
