Patent ID: 11933030
Assignee: RÜSCHO-SCHOTENRÖHR GMBH
Field: Civil engineering (Other fields)
Classification: CPC E  Y | IPC E

Claim 2:
3. The device of claim 2, wherein the flow rate control plate member comprises:
a plate type body part;
one or more flow rate control holes provided by penetrating through the plate type body part;
an edge frame part provided to protrude toward a mounting member side; and
one or more assembly protrusions or assembly grooves provided at the edge frame part and configured to be inserted into the assembly protrusions or assembly grooves provided in a bottom part of the mounting member, and
the fluid control rotation blade member comprises:
a shaft having a predetermined length; and
a plurality of blades provided at one end part of the shaft and positioned on upper surfaces of the flow rate control holes, respectively.