JP-2022510639-A5 -

Dates

Publication Date

20221205

Application Date

20191129

Description

In the embodiments of the administration system 1 shown here (Figures 1 and 2), the actuator unit 10 comprises a pneumatic actuator 12 which can be pressurized by a pressure medium, preferably compressed air, as described above. It should be noted that in Figures 1 and 2, the pneumatic actuator 12 and its coupling with the dispensing element are shown only schematically. In particular, the membrane 13 of the actuator 12 is shown only schematically, i.e., not the actual position or configuration that the membrane 13 actually has during operation in strain or retraction. This will be discussed later with reference to Figures 3 and 4. The resting position of the actuator 12 appears, as described above, when the membrane 13 and the discharge element 80 are in the resting position. Currently, the membrane 13 of the actuator 12, which is not pressurized by the pressure medium, returns to its resting position due to its residual stress. To return the plunger 80 to the resting position so that the nozzle opening 72 is released, the plunger head 81 of the plunger 80 is pushed upward by the return spring 84 in the direction of the control valve 20. The exact operation of the actuator 12 will be described later with reference to Figures 3 and 4. Figure 6 shows the dosing system of Figures 1-3 during ventilation of the pneumatic actuator. The control valve 20 is controlled here by a control unit (not shown) so that the working connection 23 interacts with the ventilation connection 24. For this purpose, the control valve 20 is moved to a second switching position inside the control valve 20 so that the flow path 27' (shown here by a dashed line) connects the two connections 23 and 24. The pressure medium flows out of the actuator 12 through the hole 17 and through the flow path 27' to the ventilation connection 24 and finally into the ventilation area 34. The plunger 80 is pushed upward by the spring 84 in the direction of the actuator unit 10, away from the nozzle 70, so that a small gap (not shown) is formed between the plunger tip 82 and the sealing seat 73. The membrane 13 is shown here in a horizontal "intermediate position," i.e., the membrane is now returned to its resting position due to ventilation of the actuator chamber.