Patent ID: 11878929
Assignee: SHIN-ETSU CHEMICAL CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC C | IPC C

Claim 0:
1. A manufacturing apparatus of porous glass base material, including a plurality of deposition apparatuses that manufacture a porous glass base material by generating raw material particles from vaporized raw material compounds in an oxyhydrogen flame, and then depositing the generated raw material particles on a rotating starting material, the manufacturing apparatus comprises:
at least one storage container for storing a raw material compound in liquid form for each respective compound;
at least one vapor generation mechanism for vaporizing the raw material compound in each storage container of the at least one storage container; and
at least one gas channel for supplying a respective vaporized raw material compound vaporized by a respective vapor generation mechanism of the at least one vapor generation mechanism to the plurality of deposition apparatuses,
wherein each gas channel includes:
a common gas channel that is shared to supply respective vaporized raw material compounds to the plurality of deposition apparatuses; and
a plurality of individual gas channels that are branched off from the common gas channel to supply respective vaporized raw material compounds to each of the deposition apparatuses individually, and

wherein each of the plurality of individual gas channels includes:
a flow controller that controls a flow rate of the respective vaporized raw material compound;
a steam valve that controls an on/off distribution of the respective vaporized raw material compound; and
a valve that is provided upstream from the flow controller and can adjust a flow channel cross-section area,

the manufacturing apparatus further comprising a control unit that adjusts an opening of each valve so that a pressure downstream of each valve in a respective individual gas channel of the plurality of individual gas channels is 60-95% of a pressure of the respective vaporized raw material compound in the respective vapor generation mechanism,
wherein PICs are provided in the common gas channel and immediately downstream of each valve, and the openings of the valves are automatically adjusted based on a detected pressure detected by each PIC, and
wherein each individual deposition apparatus produces a separate porous glass base material.