| 主权项 |
1. A liquid material discharge device comprising a nozzle having a discharge port that is opened downwards, a valve seat having a communication bore in communication with the discharge port, a liquid chamber extending vertically and communicating with the communication bore, a needle that is moved inside the liquid chamber in a reciprocating manner to open and close the communication bore of the valve seat, and a circulation flow passage through which the liquid material is supplied to the liquid chamber,
wherein the discharge device further comprises a rod-shaped flow passage formation member provided with an outer flow passage having a top opening formed at an upper end thereof and a bottom opening formed at a lower end thereof, and with an inner flow passage having a bottom opening in communication with the outer flow passage and a top opening formed at an upper end thereof, the flow passage formation member is inserted in the liquid chamber in a state that the bottom opening of the outer flow passage and the bottom opening of the inner flow passage are communicated with the communication bore of the valve seat, the circulation flow passage is constituted by a first flow passage that extends in a direction different from an extending direction of the needle, and that is communicated with the top opening of the outer flow passage in the flow passage formation member, a second flow passage that extends in a direction different from the extending direction of the needle, and that is communicated with the top opening of the inner flow passage in the flow passage formation member, the outer flow passage in the flow passage formation member, and the inner flow passage in the flow passage formation member, and flow resistance of the outer flow passage is higher than flow resistance of the first flow passage. |
