Universal turbine flowmeter

The universal turbine flowmeter comprises a flowmeter shell and a measuring core assembly, the measuring core assembly comprises a core body and a worm rotatably supported in the core body, a main oil duct arranged in the length direction of the worm is arranged in the core body, and the two ends of the main oil duct are provided with branch oil ducts communicated to a worm rotation supporting part; one end of the main oil duct penetrates through the tail end of the core body, the tail end of the core body is provided with a switching plate, and the switching plate is provided with a plug matched with the tail end of the main oil duct and a tail end oil injection hole right opposite to the tail end of the main oil duct; an oil injector fixing part is arranged at the position, close to the middle, of the flowmeter shell, a middle oil injection hole is formed in the fixing part, a middle oil injection pipe communicated with the middle oil injection hole and the main oil duct is arranged in the flowmeter shell,