LIQUID FEED PUMP AND LIQUID CHROMATOGRAPH

摘要

A recess into which a protrusion of a plunger seal is to be fitted is provided at a part of a pump head where a plunger is to be inserted into a pump chamber. The plunger seal seals the pump chamber by an outer circumferential surface of the protrusion coming into close contact with an inner circumferential surface of the recess and a surface of a flange on the side of the protrusion coming into close contact with a circumferential edge surface of the recess of the pump head due to the protrusion being fitted into the recess and being pressed by a backup ring toward the pump chamber. The inner circumferential surface of the recess of the pump head and the circumferential edge surface of the recess are covered by a film of an acid-resistant material.

主权项

1. A liquid feed pump comprising:
a pump head including a liquid inlet for drawing liquid in, a pump chamber for storing the liquid drawn in from the liquid inlet, and a liquid outlet for discharging the liquid inside the pump chamber; a plunger for sliding inside the pump head with a tip end side inserted in the pump head; a plunger seal, formed into a ring shape, for sealing a gap between the pump head and the plunger while holding the plunger by a hole at a center; and a seal attachment portion, provided at a portion of the pump head where the plunger is inserted into the pump chamber, including a wall surface for receiving the plunger seal, the wall surface being covered by a film of an acid-resistant material.