47results about How to "Good airtightness" patented technology

The invention relates to an oil pipe threaded connection structure, which is formed by screwing an oil pipe end (10) with an outer thread together with a pipe joint (11) with an inner thread. The threads adopted by the oil pipe end (10) and the pipe joint (11) are both approximate trapezoidal tapered threads; the head part of the oil pipe end (10) is provided with a circular arc surface (4); a circular conical surface (3) in interference fit with the circular arc surface is arranged on the pipe joint (11); the head part of the oil pipe end (10) is provided with an outer torque step (8); an inner torque step (7) matched with the outer torque step (8) is arranged on the pipe joint (11); the middle segment of the heat part of the oil pipe end (10) is provided with an outer cylindrical surface (2); an inner cylindrical surface (1) in interference fit with the outer cylindrical surface (2) is arranged on the pipe joint (11). The structure has the advantages of high threaded connection strength, good sealing performance, easy buckling, difficult buckling separation, good thread gluing preventing performance, strong over-torque preventing capability, etc.

The present invention discloses a stove burner. The present invention, by designing the outer-ring fire cover body and the outer fire-spraying ring into two independent structures, enables the outer-ring fire cover body to be made of a heat-resisting material of low price, which reduces the manufacturing cost of the entire stove burner; besides, with the outer edge of the annular cover body plate in contact with the top of the outer fire-spraying ring and the cover body ring attached to the sidewall of the inner ring tube close to the gas inlet tube, this structure can better achieve good airtightness of the annular chamber.

The invention discloses an airtight seal sleeve joint. The airtight seal sleeve joint comprises a sleeve male end and a sleeve female end, the sleeve male end is provided with an external thread, the sleeve female end is provided with an internal thread, the external thread of the sleeve male end is meshed with the internal thread of the sleeve female end, and the tooth profile of the external thread and the tooth profile of the internal thread are each of a slanting trapezoid shape. In addition, in the feeding direction of the external thread, the part, behind the external thread, of the sleeve male end is provided with a first seal face and a first retreat stop shoulder connected with the first seal face, and the first retreat stop shoulder is located at the tail end of the sleeve male end. The sleeve female end is provided with a second seal face and a second retreat stop shoulder, the second seal face is in interference fit with the first seal face, the second retreat stop shoulder is matched with the first retreat stop shoulder, and the second seal face is also connected with the second retreat stop shoulder. A gap is formed between the internal thread and the external thread. The airtight seal sleeve joint has good stretch resistance, compression resistance and torque resistance capability, better thread gluing resistance and excellent airtight seal performance and can adapt to the work environment of a three-exceeding gas field.

The invention discloses an airproof radio frequency coaxial connector, which comprises a connecting body 4; an inner cavity of the connecting body 4 is provided with an inner conductor 1; an insulator 3 is arranged between the inner conductor 1 and the connecting body 4; a chuck ring 5 is arranged between the insulator 3 and the connecting body 4; the outside of the connecting body 4 is provided with a remote radio unit RRU 12; the outside of the remote radio unit RRU 12 is provided with a flange 2 of which the outside is provided with a flat washer 7; and the outside of the flat washer 7 is provided with an elastic internal tooth washer 6 of which the outer end is provided with a nut 11. When harmful gas is about to invade a cavity of a filter through the flange 2, because sealing rings are arranged between the flange 2 and the connecting body and on the joint face between the flange 2 and the RRU, the harmful gas can be effectively prevented from invading the cavity of the filter; and when the harmful gas is about to invade the cavity of the filter between the inner conductor 1 and the insulator 3, the harmful gas is prevented by a clearance forced fit structure formed by agnail and the insulator 3; therefore, the airproof radio frequency coaxial connector has the characteristics of stable connecting performance and good air sealability.

The invention provides a hinge bracket sealing structure, a hinge bracket and a car. The hinge bracket sealing structure comprises a hinge shaft, closed-loop shaft sleeves, O-shaped rings and baffles,wherein the hinge shaft is arranged in the hinge bracket, the closed-loop shaft sleeves are correspondingly arranged at the two ends of the hinge shaft in a sleeving mode, and annular grooves are formed in the inner walls of the closed-loop shaft sleeves; the O-shaped rings are arranged in the annular grooves; and the baffles are arranged at the two ends of the hinge shaft. According to the hingebracket sealing structure, the closed-loop shaft sleeves are arranged at the two ends of the hinge shaft in a sleeving mode, and the annular grooves are formed in the inner walls of the closed-loop shaft sleeves and used for arranging of the O-shaped rings, so that liquid or dust entering the hinge bracket from the two ends of the hinge shaft is avoided; and the baffles are arranged at the two ends of the hinge shaft, so that the liquid or the dust entering the hinge bracket from the two ends of the hinge shaft is further prevented.