Bladder-type pressure tank and preparation method thereof

A bladder-type pressure tank, comprising:

• an outer shell;
• a bladder;
• a nozzle;
• an elbow pipe;
• and
• a saddle support;
• wherein:
• the outer shell comprises a liner and a glass-fiber layer covering an outer surface of the liner;
• the liner comprises polyethylene (PE);
• the liner further comprises a chamber, a first opening, and a second opening;
• the bladder is disposed in the chamber;
• in an inflated state of the bladder, a gap is formed between the inflated bladder and an inner surface of the liner;
• and the bladder comprises polyurethane (PU);
• the nozzle is integrated with the bladder, and is disposed in the first opening and seals the first opening;
• the elbow pipe comprises a first end and a second end;
• the first end of the elbow pipe is disposed in the second opening and communicates with the chamber;
• and the second end of the elbow pipe is configured to connect to a pipeline;
• a fixing column is integrated with the bladder;
• the first end of the elbow pipe comprises a fixing plate;
• and the fixing column is fixedly disposed through the fixing plate;
• and
• the first opening is disposed in a top part of the liner;
• the second opening is disposed in a bottom part of the liner;
• and the saddle support is fixedly disposed at a bottom portion of the outer shell to support the outer shell.