Flexible connector for large-deflection-angle nodular cast iron pipeline

Abstract

The invention discloses a large-deflection-angle ductile cast iron pipeline flexible connector which comprises a bearing head and a plug, the connector position of the bearing head is a spherical bell mouth, a spherical ring is installed in the spherical bell mouth, the plug is installed in the spherical ring and connected with the bearing head, and the spherical ring is matched with the spherical bell mouth at the joint of the plug and the bearing head. According to the T-shaped connector, the connector allowable deflection angle is increased, the insertion depth of the plug is increased through the spherical ring and the spherical bellmouth, the larger deflection angle and length compensation are achieved compared with a common T-shaped connector, and the occurrence of pipeline water leakage accidents caused by uneven settlement in mountainous regions, marshlands and earthquake-prone regions is avoided by increasing the deflection angle.

Description

Technical Field

[0001] The invention relates to the technical field of ductile iron pipe interface types, and specifically relates to a flexible interface for ductile iron pipes with a large deflection angle. Background Art

[0002] GB / T13295 specifies flexible joints for ductile iron pipes and fittings used for water transmission, requiring the following deflection angles: nominal diameters DN40-DN300—no less than 3°30′; DN350-DN600—no less than 2°30′; DN700-DN2600—no less than 1°30′; and DN2800-DN3000—no less than 1°. However, in actual construction, complex terrain, uneven foundation settlement, and sudden earthquakes can cause pipeline settlement to exceed the allowable deflection angle, resulting in pipeline leaks. Therefore, in mountainous areas, swamps, and areas prone to earthquakes with uneven settlement, joints with wider deflection angles are required to prevent such accidents. Summary of the Invention

[0003] The object of the present invention is to provide a flexible joint for ductile iron pipes with a large deflection angle, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a flexible interface for ductile iron pipes with a large deflection angle, comprising a socket and a plug, the interface of the socket being a spherical socket, a spherical ring being installed in the spherical socket, the plug being installed in the spherical ring and connected to the socket, and the spherical ring being rotated in the spherical socket to increase the deflection angle between the plug and the socket.

[0005] Preferably, the end of the spherical socket is in a closed shape, which is used to limit the spherical ring, and the spherical ring rotates in the spherical socket when deflection occurs.

[0006] Preferably, the interior of the spherical socket matches the outer diameter surface of the spherical ring, and the center of the spherical ring falls on the axis of the spherical socket, so that it is centered in the axial direction of the pipe of the socket, making the distance between the side wall of the plug and the end of the socket more balanced and increasing the deflection angle.

[0007] Preferably, the end of the spherical socket is provided with a rectangular groove for installing the spherical ring into the spherical socket, and the width of the rectangular groove matches the thickness of the spherical ring, and the rectangular groove is connected to the maximum inner diameter of the spherical socket, so that the spherical ring can enter the spherical socket more easily, thereby facilitating installation.

[0008] Preferably, the inner diameter of the spherical ring is a T-shaped interface, and the depth of the cannula inserted into the socket is extended by the spherical ring and the spherical socket, providing greater length compensation when the pipeline is deflected.

[0009] Compared with the prior art, the beneficial effects of the present invention are: a flexible interface for ductile iron pipes with a large deflection angle, in which a spherical ring and a spherical socket cooperate at the connection between the plug and the socket, thereby increasing the allowable deflection angle of the interface, and combined with the extension of the insertion depth of the plug through the spherical ring and the spherical socket, a larger deflection angle and length compensation are achieved than ordinary T-type interfaces. By increasing the deflection angle, pipeline leakage accidents caused by uneven settlement in mountainous areas, swamps and areas prone to earthquakes can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0011] Figure 2 It is a schematic diagram of the internal structure of the spherical socket of the present invention.

[0012] Figure 3 for Figure 2 Schematic diagram of the internal structure of the middle spherical ring.

[0013] Figure 4 This is a schematic diagram of the state in which the spherical ring of the present invention is inserted into the spherical socket.

[0014] Figure 5 It is a schematic diagram of the bearing structure of the present invention.

[0015] In the figure: 1-socket, 2-plug, 3-spherical socket, 4-spherical ring, 5-rectangular groove. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] See also Figure 1-5 The present invention provides a technical solution: a flexible joint for ductile iron pipes with a large deflection angle, comprising a socket 1 and a plug 2, wherein the interface of the socket 1 is a spherical socket 3, a spherical ring 4 is installed in the spherical socket 3, the plug 2 is installed in the spherical ring 4 and connected to the socket 1, and the spherical ring 3 rotates in the spherical socket 4 to increase the deflection angle between the plug 2 and the socket 1.

[0018] The end of the spherical socket 3 is in a closed shape, which is used to limit the spherical ring 3.

[0019] The interior of the spherical socket 3 matches the outer diameter surface of the spherical ring 4 , and the center of the spherical ring 3 falls on the axis of the spherical socket 3 .

[0020] The end of the spherical socket 3 is provided with a rectangular groove 5 for the spherical ring 4 to be inserted into, and the width of the rectangular groove 5 matches the thickness of the spherical ring 4 .

[0021] When installing the spherical ring 4, first place the axis of the spherical ring 4 into the rectangular groove 5 perpendicular to the axis of the spherical socket 3, then push the spherical ring 4, which can be easily inserted into the spherical socket 3, and then rotate the spherical ring 4 radially 90° to constrain the spherical ring 4 in the spherical socket 3, and achieve a large angle deflection of 15°. This makes installation simple and convenient, and avoids many problems caused by fastening with bolts and flanges.

[0022] The end opening of the spherical socket 3 is open, which can increase the deflection angle between the plug 2 and the socket 1.

[0023] The inner diameter of the spherical ring 4 is a T-shaped interface, and the depth of the plug 2 inserted into the socket 1 is extended through the spherical ring 4 and the spherical socket 3, providing greater length compensation when the pipeline is deflected.

[0024] The other side of the spherical ring 4 corresponding to the insertion end of the plug 2 is closed, and the inner diameter is larger than the outer diameter of the plug 2.

[0025] The conical end of the plug 2 is conveniently inserted into the spherical ring 4. The spherical ring 4 extends inwardly corresponding to the insertion end of the plug 2, so that the inner end of the spherical ring 4 matches the outer diameter of the plug 2, which is used to limit the insertion angle of the plug 2. A T-shaped rubber ring is installed at the inward extension of the spherical ring 4 to increase its sealing.

[0026] The spherical portion of the spherical socket 3 corresponding to the spherical ring 4 after installation extends outward to form an installation groove, and a rubber ring is provided in the installation groove to increase the sealing performance of the connection.

[0027] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A flexible joint for ductile iron pipes with a large deflection angle, comprising a socket and a plug, characterized in that: The interface of the socket is a spherical socket, a spherical ring is installed in the spherical socket, the plug is installed in the spherical ring and connected to the socket, and the spherical ring rotates in the spherical socket to increase the deflection angle between the plug and the socket.

2. The flexible joint for ductile iron pipes with large deflection angles according to claim 1, characterized in that: The end of the spherical socket is in a closed shape and is used to limit the spherical ring.

3. The flexible joint for ductile iron pipes with large deflection angles according to claim 2, characterized in that: The interior of the spherical socket matches the outer diameter surface of the spherical ring, and the center of the spherical ring falls on the axis of the spherical socket.

4. The flexible joint for ductile iron pipes with large deflection angles according to claim 3, characterized in that: The end of the spherical socket is provided with a rectangular groove for the spherical ring to be inserted into, and the width of the rectangular groove matches the thickness of the spherical ring.

5. The flexible joint for ductile iron pipes with large deflection angles according to claim 1, characterized in that: The inner diameter of the spherical ring is a T-shaped interface, and the depth of the plug inserted into the socket is extended through the spherical ring and the spherical socket, providing greater length compensation when the pipeline is deflected.

Images