Abstract: A disclosed drug injection device includes: a case having a drug container located therein at one side; and a discharge amount adjustment module that is provided at the other side inside the case and, while rotating by a set angle only in one direction, adjusts a discharge amount of a drug stored in the drug container while speed is reduced by a speed reduction unit consisting of a combination of gears; a rotation amount detection module that detects a rotation value of the speed reduction unit and transmits detected data to a control device; and a locking module for locking to restrict rotation of the speed reduction unit when the rotation value detected by the rotation amount detection module reaches a set value.

Abstract: A disclosed drug injection device includes: a case having a drug container located therein at one side; and a discharge amount adjustment module that is provided at the other side inside the case and, while rotating by a set angle only in one direction, adjusts a discharge amount of a drug stored in the drug container while speed is reduced by a speed reduction unit consisting of a combination of gears; a rotation amount detection module that detects a rotation value of the speed reduction unit and transmits detected data to a control device; and a locking module for locking to restrict rotation of the speed reduction unit when the rotation value detected by the rotation amount detection module reaches a set value.

Abstract: A hermetic vessel capable of preventing noise caused by fluid flow, and an oil separator, a gas-liquid separator, and an air conditioning system using the same. The hermetic vessel having a vessel body includes an inlet through which a fluid flows into the vessel body, and a discharge pipe which is inserted into the vessel body to discharge the fluid. The discharge pipe includes a first discharge pipe which guides a flow of the fluid in a first direction and causes a wave of a higher frequency than an audible frequency, and a second discharge pipe which is connected to the first discharge pipe to guide a flow of the fluid from the first discharge pipe in a second direction which is different from the first direction.