Underwater detection air inlet leakage-preventing device of fuel oil tank

Abstract

The invention relates to an underwater detection air inlet leakage-preventing device of a fuel oil tank. An air injection pipe is inserted into an upper end opening of an oil injection pipe; a rubber sleeve is arranged between the air injection pipe and the oil injection pipe; the lower end opening of the air injection pipe is rotationally connected with a mushroom-head screw; through holes are formed in the mushroom-head screw; the lower end face of the rubber sleeve leans against a flange of the mushroom-head screw; an expansion mechanism is arranged at the upper end of the air injection pipe. The expansion mechanism comprises a cylinder sleeve and an inner disc; the lower end of the inner disc is located in the cylinder sleeve; a locking air cavity is arranged between the lower end face of the inner disc and a bottom plate of the cylinder sleeve; the upper end of the air injection pipe penetrates through a central hole of the bottom plate and is connected with the center of the lower end face of the inner disc to form a whole body; the upper end opening of the cylinder sleeve is provided with a limiting clamping spring which is clamped on a necking down part on the middle of the inner disc, in an embedding manner; the inner disc is rotationally connected with an air pipe connector I and an air pipe connector II which are communicated with the central hole of the air injection pipe by an oil tank air inlet hole channel respectively, and are communicated with the locking air cavity by a cylinder body air inlet hole channel. The device can be smoothly inserted into and pulled out from the oil injection pipe and the reliable sealing also can be realized.

Description

technical field [0001] The invention relates to a fuel tank test device, in particular to a fuel tank underwater detection air intake leakage prevention device. Background technique [0002] The fuel tank body is connected with a fuel injection pipe, and the lower port of the fuel injection pipe is equipped with a throttle cover that can be opened downward. When the fuel flows into the fuel injection pipe, the throttle cover is pushed away, and the fuel enters the inner cavity of the fuel tank. After the fuel stops flowing, the throttle cover is automatically closed under the action of spring tension, preventing fuel from splashing into the fuel injection pipe when the vehicle is running. [0003] After the plastic fuel tank is manufactured, it needs to be tested for sealing. During the test, each valve of the fuel tank needs to be blocked. The inner cavity is filled with high-pressure gas, and then the fuel tank is submerged in water as a whole to observe whether the fuel ...

AI Technical Summary

Problems solved by technology

Due to the need to ensure the sealing between the plug, the oil injection pipe and the gas injection pipe, the fit between the plug and the oil injection pipe must be very tight, and the operator cannot insert the plug smoothly, it is laborious, and the insertion depth is difficult to meet the requirements; even After the plugging and sealing are completed, because the high-pressure gas in the inner cavity of the box tends to push the plug out, the plug is still easy to loosen and escape

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