Dual sealing device for high-pressure pipeline in automobile engine

[0021] Example 1:

[0022] Such as figure 1 As shown, a dual sealing device for high-pressure pipelines in an automobile engine includes a pier-head adapter 1, a double-threaded joint 2, a lock nut 3, a flange A4 and a flange B5. The pier head adapter device 1 includes a tube body with a hollow structure, one end of the tube body has a pier head 6 structure, and the other end is connected with a high-pressure pipeline, and the tail end of the pier head 6 has a spherical step 8; The double-threaded joint 2 has a hollow structure, one end surface of which is provided with a concave hole 7 that is matched with the pier 6 of the pier-head adapter device 1, and the recessed hole 7 and the pier 6 can realize relative rotation between the two A flange plate A4 is sleeved on the external thread of the end; the locking nut 3 is coaxially sleeved on the pipe body of the pier-type adapter device 1, and the internal thread of the locking nut 3 and the double-threaded joint 2 In cooperation, the inner wall of the lock nut 3 is provided with a protrusion 9 at one end away from the pier head 6, and the mating surface of the protrusion 9 and the spherical step 8 is a conical surface, and the lock nut 3 is away from the pier head 6 A flange B5 is provided on one side of the A4, the flange B5 is coaxially sleeved on the pipe body of the pier-head adapter device 1, and the flange A4 and the flange B5 are fixedly matched by bolts.

[0023] Wherein, the mating surfaces of the flange A4 and the flange B5 respectively and the lock nut 3 are provided with rubber gaskets 10.

[0024] The concave hole 7 is of a flaring type, the included angle of the conical surface is 65 degrees, and the front end of the pier 6 is an involute pier surface.

[0025] The mating surface of the protrusion 9 and the spherical step 8 is a tapered surface, and the included angle of the tapered surface is 55 degrees.

[0026] The pier head adapter 1, the double-threaded joint 2, and the lock nut 3 are all made of titanium alloy material.

[0027] It is worth noting that in another solution of the present invention, the front end of the pier head adopts an elliptical pier head surface. Since the elliptic curve is similar to the involute curve, the specific processing can be carried out according to actual needs, and no separate description of additional embodiments is required. The front end of the pier head adopts an elliptical pier head surface.

[0028] Example 2:

[0029] Such as figure 2 , A dual sealing device for high-pressure pipelines in automobile engines, comprising a pier-head adapter device 1, a double threaded joint 2, a lock nut 3, a flange A4 and a flange B5, wherein the pier The head adapter device 1 includes a tube body with a hollow structure. One end of the tube body has a pier 6 structure, and the other end is connected with a high-pressure pipeline. The tail end of the pier 6 has a spherical step 8; The threaded joint 2 has a hollow structure, in which one end surface is provided with a recessed hole 7 that matches with the pier 6 of the pier-head adapter device 1, and the recessed hole 7 and the pier 6 have a cooperation that can realize the relative rotation of the two The outer thread of this end is sleeved with a flange A4; the lock nut 3 is sleeved coaxially on the pipe body of the pier-type adapter 1, and the inner thread of the lock nut 3 is matched with the double thread joint 2. , The inner wall of the lock nut 3 is provided with a protrusion 9 at one end away from the pier 6, and the mating surface of the protrusion 9 and the spherical step 8 is a conical surface, and the lock nut 3 is far away from the pier 6 A flange plate B5 is arranged on the side, and the flange plate B5 is coaxially sleeved on the pipe body of the pier-head adapter device 1, and the flange plate A4 and the flange plate B5 are fixedly matched by bolts.

[0030] Wherein, the mating surfaces of the flange A4 and the flange B5 respectively and the lock nut 3 are provided with rubber gaskets 10.

[0031] The concave hole 7 is an embedded spherical surface, and the front end of the pier 6 is a spherical pier surface.

[0032] The mating surface of the protrusion 9 and the spherical step 8 is a tapered surface, and the included angle of the tapered surface is 55 degrees.

[0033] The pier head adapter 1, the double-threaded joint 2, and the lock nut 3 are all made of titanium alloy material.