Dual Seal Roller Cone Bits with Seal Pressure Adjustment
An adjustment device and sealing pressure technology, applied in construction and other directions, can solve the problems such as the pressure difference between the inside and outside of the sand retaining ring that is not applicable to double sealing rings, the pressure difference between the inside and outside of the sand retaining ring 4 that cannot be adjusted, damage to the bearing and the main seal ring, etc. To facilitate processing and pressure transmission, improve drilling efficiency and prolong life
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[0020] The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments. As shown in the figure: a double-sealed roller cone bit with a sealing pressure adjustment device includes a roller cone 2 and a tooth palm 1. A locking steel ball 11 is arranged between the cone shaft hole and the tooth palm journal, and the tooth palm passes through The palm journal is connected with the cone. In the present invention, the inner hole of the cone forms a bearing sealing cavity by matching the main sealing ring 3 with the journal, and a pressure balance and oil storage compensating device is provided on the palm 1 to communicate with the bearing cavity through a long oil hole. The pressure balance and oil storage compensation device includes an oil storage hole 12 arranged on the tooth palm 1, and an oil storage bag 13, an oil storage cup 14, a gland 15, a retaining spring 16 and a plug 19...
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