CN210003985U

CN210003985U - straight-edge cambered-surface high-pressure delivery pipe joint

Info

Publication number: CN210003985U
Application number: CN201920858960.XU
Authority: CN
Inventors: 张刚强; 徐贤国
Original assignee: Ningbo Strong Machinery Co Ltd
Current assignee: Ningbo Strong Machinery Co Ltd
Priority date: 2019-06-10
Filing date: 2019-06-10
Publication date: 2020-01-31
Anticipated expiration: 2029-06-10

Abstract

straight-side cambered surface high-pressure conveying pipe joints comprise joints, nuts and tapered interfaces, wherein the outer side faces of the joints are sequentially an cambered surface I, a joint conical surface, a cambered surface II and a rod body face from bottom to top, the diameter of the cambered surface I is gradually increased from bottom to top, the diameter of the joint conical surface is gradually increased from bottom to top, the diameter of the cambered surface II is gradually reduced from bottom to top, the cambered surface I and the cambered surface II are in smooth transition connection through the joint conical surface, the upper portions of the nuts are clamped on the cambered surface II to form a secondary sealing surface, the lower portions of the nuts are in threaded connection with the outer surface of the tapered interfaces through internal threads, and the tapered interfaces and the cambered surface.

Description

straight-edge cambered-surface high-pressure delivery pipe joint

Technical Field

The utility model relates to a pipeline high pressure connection technology, concretely relates to kinds of straight flange cambered surface high pressure delivery pipe joints.

Background

In the high-pressure working environment, the pipeline vibration amplitude is large, the axis offset of adjacent pipelines is large, and the joint must be sealed to prevent pressure relief or oil leakage.A common way is that a conical matched spherical cambered surface forms an extrusion surface, as disclosed in Chinese patent application 2018106690757, the matching way is between the joint and a matched conical surface, and after the joint rotates, sealing "lines" are always formed on certain cross sections of the conical surface (which can be judged according to common living knowledge, for example, balls are clamped on a cup mouth to rotate and only contact with lines on the edge of the cup mouth). although theoretically, the longer the spherical surface or the higher the corresponding spherical arch height is, the liquid buffer or the stressed area can be increased, so that reduces the connection rigidity of the joint, and the joint has low service life and high wear.

Disclosure of Invention

In order to solve the problem, the utility model provides an kinds of straight flange cambered surface high pressure feed pipe connects realizes multistage sealed through the spherical extrusion face of several, and arrangement compact structure has greatly improved the leakproofness.

The utility model adopts the technical scheme as follows:

straight-side cambered surface high-pressure delivery pipe joints comprise joints, nuts and tapered interfaces;

the outer side surface of the joint is sequentially provided with an arc surface I, a joint conical surface, an arc surface II and a rod body surface from bottom to top, the diameter of the arc surface I is gradually increased from bottom to top, the diameter of the joint conical surface is gradually increased from bottom to top, the diameter of the arc surface II is gradually reduced from bottom to top, and the arc surface I and the arc surface II are in smooth transition connection through the joint conical surface;

the upper part of the nut is clamped on the cambered surface II to form a secondary sealing surface, and the lower part of the nut is screwed on the outer surface of the conical connector through internal threads;

the conical interface and the cambered surface I are matched to form an -grade sealing surface, and the cambered surface I and the cambered surface II are both involute profiles on the cross sections.

In the straight-side cambered surface high-pressure conveying pipe joint, a nut conical surface is arranged at the matching part of the upper port of the nut and the rod body surface of the joint, and the diameter of the nut conical surface is gradually increased from bottom to top; the lower part of the nut is in a conical shape at the matching part with the cambered surface II.

In the straight-edge cambered surface high-pressure conveying pipe joint, the taper of the conical surface of the nut is 20-30 degrees, the taper of the conical interface is 30-35 degrees, and the taper of the conical surface of the joint is 0-1 degree larger than that of the conical interface.

The utility model has the advantages that the nut is connected with the outer edge of the conical connector in a threaded manner to increase the connection strength, the lower end of the connector is matched with the conical connector to form an -level sealing surface, the upper end of the connector is matched with the nut to form a secondary sealing surface, the sealing effect is greatly improved, the two groups of cambered surfaces and the conical surface design ensure good sealing performance even if the connector has a deflection angle in assembly or work, the two cambered surfaces of the connector are connected through the conical surface, the structure is compact, and the connector can bear the system pressure of more than 350 bar.

Drawings

Fig. 1 is a schematic view of an assembly structure of the present invention;

FIG. 2 is a schematic view of a cross-section of the joint of the present invention;

fig. 3 is a schematic diagram of an inclined use state of the present invention.

In the figure, 1 is a joint, 2 is a nut, 3 is a conical interface, 4 is -grade sealing surface, 5 is a secondary sealing surface, 11 is an arc surface I, 12 is an arc surface II, 13 is a joint conical surface, and 21 is a nut conical surface.

Detailed Description

The present invention will be explained in with reference to the drawings.

The utility model discloses a straight-edge cambered surface high-pressure conveying pipe joint, which comprises a joint 1, a nut 2 and a conical interface 3;

the outer side surface of the joint 1 sequentially comprises an arc surface I11, a joint conical surface 13, an arc surface II 12 and a rod body surface from bottom to top, wherein the diameter of the arc surface I11 is gradually increased from bottom to top, the diameter of the joint conical surface 13 is gradually increased from bottom to top, the diameter of the arc surface II 12 is gradually decreased from bottom to top, and the arc surface I11 and the arc surface II 12 are in smooth transition connection through the joint conical surface 13; the setting of the joint conical surface 13 can limit the rotation range of the joint 1, and is suitable for the working occasions of high-pressure, small-swing and large-flow pipelines.

The upper part of the nut 2 is clamped on the cambered surface II 12 to form a secondary sealing surface 5, and the lower part of the nut is screwed on the outer surface of the conical connector 3 through internal threads;

the tapered interface 3 and the cambered surface I11 are matched to form an -level sealing surface 4, and the cambered surface I11 and the cambered surface II 12 both have involute profiles on the cross sections.

According to the straight-side cambered surface high-pressure conveying pipe joint, the matching position of the upper port of the nut 2 and the rod body surface of the joint 1 is provided with the nut conical surface 21, and the diameter of the nut conical surface 21 is gradually increased from bottom to top. The lower part of the nut 2 is in a conical shape at the matching part with the cambered surface II 12.

In the straight-edge cambered surface high-pressure conveying pipe joint, the taper of the nut conical surface 21 is 20-30 degrees, the taper of the conical interface 3 is 30-35 degrees, and the taper of the joint conical surface 13 is 0-1 degree larger than that of the conical interface 3.

In a static state, sealing 'lines' are formed between the arc surface I11 and the arc surface II 12 and the sealing position, when the joint 1 rotates, as shown in the process of fig. 3, because the conical interface 3 below the nut 2 is not moved, and the arc surface I11 and the arc surface II 12 are involute profiles, the sealing position of the left half part in fig. 3 is moved upwards, and the sealing position of the right half part is moved downwards (refer to the process of meshing between a gear and a rack), so , a continuous sealing 'surface' is formed on the conical interface 3 below the nut 2, compared with the prior art, the spherical sealing is always 'lines', and the sealing 'surface' type structure of the scheme can bear higher pressure and has longer service life.

When the right half part of the joint 1 swings to the maximum angle, namely the joint conical surface 13 and the conical surface of the conical interface 3 are overlapped and pressed, the contact area is enlarged, the right half part cambered surface I11 of the joint 1 is in line contact with the joint conical surface 13, the cambered surface II 12 is in line contact with the lower cone of the nut 2, and the left part and the right part of the joint 1 still have two sealing surfaces in the limit state, so that higher pressure can be stably borne.

Claims

1, straight-side cambered surface high-pressure conveying pipe joints, which are characterized by comprising a joint (1), a nut (2) and a conical interface (3);

the outer side surface of the joint (1) is sequentially provided with an arc surface I (11), a joint conical surface (13), an arc surface II (12) and a rod body surface from bottom to top, the diameter of the arc surface I (11) is gradually increased from bottom to top, the diameter of the joint conical surface (13) is gradually increased from bottom to top, the diameter of the arc surface II (12) is gradually decreased from bottom to top, and the arc surface I (11) and the arc surface II (12) are in smooth transition connection through the joint conical surface (13);

the lower part of the nut (2) is clamped on the cambered surface II (12) to form a secondary sealing surface (5), and the lower part of the nut is screwed on the outer surface of the conical connector (3) through internal threads;

the conical interface (3) is matched with the cambered surface I (11) to form an -level sealing surface (4);

the cambered surface I (11) and the cambered surface II (12) are in involute profiles on axial sections.

2. The straight-sided cambered surface high-pressure delivery pipe joint according to claim 1, wherein: a nut conical surface (21) is arranged at the matching part of the upper port of the nut (2) and the rod body surface of the joint (1), and the diameter of the nut conical surface (21) is gradually increased from bottom to top; the lower part of the nut (2) is in a conical shape at the matching part with the cambered surface II (12).

3. The straight-sided cambered surface high-pressure delivery pipe joint according to claim 1, wherein: the taper of the nut conical surface (21) is 20-30 degrees, the taper of the conical interface (3) is 30-35 degrees, and the taper of the joint conical surface (13) is 0-1 degrees larger than the taper of the conical interface (3).