Ventilation device for detecting air tightness of oil tank

Abstract

The invention discloses a ventilation device for detecting the airtightness of an oil tank, belonging to the field of automobile oil tank detection devices. The ventilation device for detecting the airtightness of the oil tank is high in pressure bearing capacity, and comprises a ventilation shaft, a sealing sleeve fixing structure, an elastic sealing sleeve and a sealing sleeve gland, wherein a ventilation hole is formed in the ventilation shaft in the axial direction; the sealing sleeve fixing structure, the elastic sealing sleeve and the sealing sleeve gland are sequentially arranged on theventilation shaft in a sleeving mode from back to front; the elastic sealing sleeve is matched with the ventilation shaft and connected with the sealing sleeve fixing structure; the outer diameter ofthe elastic sealing sleeve is matched with the inner diameter of an oil filling port; the sealing sleeve gland is connected with the ventilation shaft; and the ventilation shaft can axially move to drive the sealing sleeve gland to compress the elastic sealing sleeve. The pressure-bearing capacity of the ventilation device is high; the oil tank does not fall off when the internal pressure of theoil tank reaches 60 Kpa; and the ventilation device can meet requirements on air tightness detection of national VI oil tanks in China.

Description

technical field [0001] The invention relates to the field of automobile fuel tank detection devices, in particular to a ventilator for fuel tank air tightness detection. Background technique [0002] In order to meet the requirements of the National VI evaporative emission regulations for automobiles, higher requirements are put forward for the sealing performance of the National VI fuel tank. Generally speaking, the evaporative emission value assigned to the fuel tank by the OEM is generally ≤70~80mg / day test, so Fuel tank tightness detection is particularly important. [0003] The national five fuel tank seal test requirements are: 30Kpa compressed air is introduced from the fuel tank filling port, immersed in water, and the pressure is kept for 30s without leakage; Add ICV valve. Therefore, there is an urgent need for a breather device with strong pressure bearing capacity. At the same time, it is also necessary to detect the welding quality inside the fuel filler to en...

AI Technical Summary

Problems solved by technology

This method mainly has the following disadvantages: 1. The pressure bearing capacity is poor, and the rubber hose will fall off when the internal pressure of the fuel tank reaches 35Kpa, which cannot meet the air tightness testing requirements of the National VI fuel tank; 2. It is difficult to insert the rubber hose and the work intensity is high; 3. Unable to judge the internal welding quality, which will affect the subsequent ICV valve assembly

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