Nodular cast iron pipe fitting butt joint structure

Abstract

The utility model discloses a nodular cast iron pipe fitting butt joint structure which comprises a first pipe fitting and a second pipe fitting, a socket portion is formed at one end of the first pipe fitting, and a plug portion is formed at one end of the second pipe fitting. A positioning step surface is formed at the joint of the socket part and the inner cavity of the first pipe fitting; the end face, inserted into the socket part, of the plug part abuts against the positioning step face. At least two first insertion holes are formed in the outer wall of the socket part in a penetrating mode in the direction perpendicular to the axis of the socket part, and the inner side walls, away from the center of the socket part, of the first insertion holes are tangent to the inner circumferential face of the socket part; limiting columns are arranged in the first inserting holes in a penetrating mode, and limiting grooves allowing the limiting columns to penetrate through are formed in the peripheral face of the plug part. The first inserting hole is in clearance fit with the limiting column, a plugging piece is arranged on the socket part, and the limiting column is relatively fixed to the socket part through the plugging piece. The butt joint device is convenient in butt joint operation, convenient to disassemble and assemble, stable and reliable in connection and high in butt joint assembly precision.

Description

Technical Field

[0001] The utility model relates to the technical field of ductile iron pipes, in particular to a ductile iron pipe fitting butt joint structure. Background Art

[0002] Ductile iron pipe fittings are pipes made by centrifugally casting molten iron at high speed using a centrifugal ductile iron casting machine after adding a nodulizing agent. Ductile iron pipe fittings offer advantages such as high strength, high elongation, impact resistance, corrosion resistance, and excellent sealing properties. They are widely used in municipal pipeline projects, electromechanical installation projects, and outdoor pipeline installation projects. Existing butt-jointing structures between ductile iron pipe fittings often utilize a flange-and-bolt structure, where flanges are welded to the ends of each fitting, and bolts are then threaded through the flanges and tightened to connect the two fittings. This type of butt-jointing structure is cumbersome to operate, making assembly and disassembly and subsequent maintenance difficult, and the butt-jointing accuracy is relatively low. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a ductile iron pipe fitting butt joint structure, which has convenient butt joint operation, stable and reliable connection and high assembly precision.

[0004] The technical solution adopted by the utility model to solve the technical problem is: a ductile iron pipe fitting butt joint structure, comprising a first pipe fitting and a second pipe fitting connected coaxially, wherein the first pipe fitting is formed with a socket portion at one end close to the second pipe fitting, and the second pipe fitting is formed with a plug portion matching the socket portion at one end close to the first pipe fitting;

[0005] The inner diameter of the socket portion is larger than the inner diameter of the first pipe, and a positioning step surface is formed at the junction of the socket portion and the inner cavity of the first pipe; the end face of the plug portion inserted into the socket portion is tightly pressed against the positioning step surface;

[0006] The outer wall of the socket part is provided with at least two first sockets along a direction perpendicular to its own axis, and the inner side walls of the first sockets away from the center of the socket part are tangent to the inner circumference of the socket part; a limiting post is passed through each first socket, and the outer circumference of the plug part is provided with a limiting groove for the limiting post to pass through; there is a clearance fit between the first sockets and the limiting post, and a sealing piece is provided on the socket part, and the limiting post is relatively fixed to the socket part through the sealing piece.

[0007] Furthermore, the sealing member includes a sealing ring, and the outer peripheral surface of the socket part has two ring platforms integrally formed thereon, and an annular groove for the sealing ring to be sleeved is formed between the two ring platforms; the sealing ring is rotatably connected to the socket part, and the sealing ring is provided with at least two second sockets, and the first socket and the second socket correspond one to one; when the limit column is inserted into the socket part, the first socket and the corresponding second socket are coaxial.

[0008] Furthermore, a switching gap is formed on the outer periphery of one of the ring platforms, and an extension plate is fixed to one side wall of the sealing ring, and the extension plate is located in the switching gap; when the first socket is coaxial with the corresponding second socket, the extension plate is located at one end of the switching gap, and when the extension plate moves to the other end of the switching gap, the first socket and the corresponding second socket are misaligned.

[0009] Furthermore, a filling plate is provided between the extension plate and the side wall of the switching gap, and sliding bars are fixed on both end faces of the filling plate. The side wall of the extension plate close to the filling plate and the side wall of the switching gap close to the filling plate are both provided with sliding grooves adapted to the sliding bars.

[0010] Furthermore, a planar boss is integrally formed on the inner circumferential surface of the socket portion, and a notch plane that cooperates with the planar boss is formed on the outer circumferential surface of the plug portion.

[0011] Furthermore, the inner wall of the sealing ring is provided with a plurality of grooves, each of which is fixedly embedded with a sealing gasket. When the first insertion hole is misaligned with the corresponding second insertion hole, the sealing gasket is sealed on the outside of the first insertion hole.

[0012] Beneficial effects of the utility model:

[0013] The utility model discloses a ductile iron pipe docking structure, which plays a circumferential positioning role for the connection of the pipe fittings by setting a flat boss and a cut plane when connecting the pipe fittings, and uses the plane to perform docking positioning of the pipe fittings, with low manufacturing difficulty and high assembly precision, and can ensure the position of the limit groove and the limit column. It is only necessary to insert the limit column into the first insertion hole, and the limit column passes through the limit groove to achieve axial limit, and then rotate the blocking ring to block the limit column in the first insertion hole, so that the first pipe fitting and the second pipe fitting can be relatively fixed in position; when disassembling, it is only necessary to rotate the blocking ring to the desired position and remove the limit column from the first insertion hole, so that the docking operation is convenient and the connection is reliable; and a sealing gasket is provided on the inner side of the blocking ring to improve the sealing performance of the docking structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a partial structural diagram of the utility model.

[0015] Figure 2 It is a partial exploded view of the socket part and the plug part of the present invention.

[0016] Figure 3 It is a front view of the first pipe fitting in the present utility model.

[0017] Figure 4 It is a partial exploded view of the socket part in the present invention.

[0018] Figure 5It is a structural schematic diagram of the sealing ring in the utility model.

[0019] Figure 6 It is a structural diagram of the plug part of the utility model.

[0020] In the figure: 1. first pipe fitting; 11. socket part; 12. positioning step surface; 13. first insertion hole; 14. ring platform; 141. switching notch; 15. ring groove; 16. flat boss; 2. second pipe fitting; 21. plug part; 211. cut plane; 22. limiting groove; 3. limiting column; 4. sealing ring; 41. second insertion hole; 42. extension plate; 43. sealing gasket; 44. filling plate; 441. sliding strip. DETAILED DESCRIPTION

[0021] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0022] The utility model discloses a ductile iron pipe fitting butt joint structure.

[0023] Reference Figure 1 and Figure 2 A ductile iron pipe fitting docking structure includes a first pipe fitting 1 and a second pipe fitting 2 that are coaxially connected. A socket portion 11 is formed at one end of the first pipe fitting 1 close to the second pipe fitting 2, and a plug portion 21 that matches the socket portion 11 is formed at one end of the second pipe fitting 2 close to the first pipe fitting 1.

[0024] The inner diameter of the socket part 11 is larger than the inner diameter of the first pipe fitting 1, so that a positioning step surface 12 is formed at the junction of the socket part 11 and the inner cavity of the first pipe fitting 1; when the plug part 21 is inserted into the socket part 11, the front end surface of the plug part 21 is tightly pressed against the positioning step surface 12, limiting the docking depth of the two pipe fittings.

[0025] Reference Figures 2 to 4 At least two first insertion holes 13 are formed on the outer wall of the socket part 11 in a direction perpendicular to its own axis. In this embodiment, there are two first insertion holes 13, which are symmetrically distributed on both sides of the axial direction of the socket part 11, and the inner side wall of the first insertion hole 13 away from the center of the socket part 11 is tangent to the inner circumferential surface of the socket part 11. The width of the first insertion hole 13 is smaller than the wall thickness of the plug part 21, which provides space for the limit column 3 installed subsequently and ensures that the limit column 3 will not penetrate into the plug part 21.

[0026] Reference Figures 4 to 6A limiting column 3 is passed through each first socket 13, and the two end faces of the limiting column 3 are flush with the outer circumferential surface of the socket 11. The outer circumferential surface of the plug part 21 is provided with a limiting groove 22 for the limiting column 3 to pass through; there is a clearance fit between the first socket 13 and the limiting column 3, and a blocking piece is provided on the socket 11, and the limiting column 3 is relatively fixed to the socket 11 through the blocking piece.

[0027] When connecting the first pipe fitting 1 and the second pipe fitting 2, it is only necessary to insert the limiting post 3 into the first insertion hole 13 and the middle part of the limiting post 3 into the limiting groove 22 of the plug portion 21, so that the first pipe fitting 1 and the second pipe fitting 2 are relatively fixed in position, and then the limiting post 3 is sealed in the first insertion hole 13 by the blocking piece. Conversely, when separating the first pipe fitting 1 and the second pipe fitting 2, the blocking piece at the end of the limiting post 3 is removed. Due to the clearance fit between the limiting post 3 and the first insertion hole 13, the limiting post 3 can be easily withdrawn from the first insertion hole 13, thereby achieving the separation of the first pipe fitting 1 and the second pipe fitting 2.

[0028] Reference Figure 4 and Figure 5 The sealing part includes a sealing ring 4, and two annular platforms 14 are integrally formed on the outer circumference of the socket 11, and an annular groove 15 for the sealing ring 4 to be sleeved is formed between the two annular platforms 14; the sealing ring 4 is rotatably connected to the socket 11, and the sealing ring 4 is provided with at least two second sockets 41, and the first socket 13 and the second socket 41 correspond one to one; when the limiting column 3 is inserted into the socket 11, the first socket 13 is coaxial with the corresponding second socket 41, and then the limiting column 3 can pass through the second socket 41 into the first socket 13; then, the sealing ring 4 is rotated so that the second socket 41 is misaligned with the first socket 13, and then the limiting column 3 is fixed in the first socket 13, which is easy to operate.

[0029] Reference Figure 3 and Figure 5 A switching notch 141 is formed on the outer periphery of the ring platform 14 relatively close to the second pipe fitting 2, and an extension plate 42 is welded and fixed to one side wall of the sealing ring 4, and the extension plate 42 is located in the switching notch 141; when the first socket 13 is coaxial with the corresponding second socket 41, the extension plate 42 is located at one end of the switching notch 141, and when the extension plate 42 moves to the other end of the switching notch 141, the first socket 13 and the corresponding second socket 41 are misaligned.

[0030] When the extension plate 42 is moved to a position misaligned between the first insertion hole 13 and the second insertion hole 41, a filler plate 44 is installed between the extension plate 42 and the side wall of the switching notch 141. This filler plate 44 is used to fill the remaining space within the switching notch 141, thereby fixing the position of the extension plate 42. Slide bars 441 are fixed to both ends of the filler plate 44. Slide grooves that mate with the slide bars 441 are formed on the side wall of the extension plate 42 near the filler plate 44 and the side wall of the switching notch 141 near the filler plate 44, allowing the filler plate 44 to be slidably inserted between the extension plate 42 and the side wall of the switching notch 141. The provision of the extension plate 42 facilitates the rotation of the blocking ring 4, and the cooperation between the filler plate 44 and the extension plate 42 defines the position of the blocking ring 4.

[0031] Reference Figure 4 and Figure 6 When docking the first pipe fitting 1 and the second pipe fitting 2, in order to ensure that the limit column 3 can correspond to the position of the limit groove 22 of the plug part 21, a flat boss 16 is integrally formed on the inner circumference of the socket part 11, and a cut plane 211 that cooperates with the flat boss 16 is formed on the outer circumference of the plug part 21. When the plug part 21 is inserted into the socket part 11, the cut plane 211 of the plug part 21 is in contact with the upper surface of the flat boss 16, thereby playing the role of assembly positioning and ensuring assembly accuracy.

[0032] Reference Figure 5 Since there is a gap connection between the limiting column 3 and the first socket 13, in order to ensure the sealing of the connection between the first pipe fitting 1 and the second pipe fitting 2, in this embodiment, four grooves are opened on the inner wall of the sealing ring 4, and two grooves correspond to the two ends of the first socket 13. A sealing gasket 43 is fixedly embedded in each groove. When the first socket 13 is misaligned with the corresponding second socket 41, the sealing gasket 43 moves to the first socket 13, and then blocks and seals the first socket 13 to ensure the sealing of the pipe connection.

[0033] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A ductile iron pipe fitting butt joint structure, characterized by: The invention comprises a first pipe (1) and a second pipe (2) which are coaxially connected, wherein the first pipe (1) is formed with a socket portion (11) at one end close to the second pipe (2), and the second pipe (2) is formed with a plug portion (21) which matches the socket portion (11) at one end close to the first pipe (1); The inner diameter of the socket part (11) is larger than the inner diameter of the first pipe part (1), and a positioning step surface (12) is formed at the junction of the socket part (11) and the inner cavity of the first pipe part (1); the end surface of the plug part (21) inserted into the socket part (11) is tightly pressed against the positioning step surface (12); At least two first jacks (13) are provided on the outer wall of the socket part (11) in a direction perpendicular to its own axis, and the inner side wall of the first jack (13) away from the center of the socket part (11) is tangent to the inner peripheral surface of the socket part (11); a limiting column (3) is passed through each first jack (13), and a limiting groove (22) for the limiting column (3) to pass through is provided on the outer peripheral surface of the plug part (21); there is a clearance fit between the first jack (13) and the limiting column (3), and a blocking piece is provided on the socket part (11), and the limiting column (3) is fixed relative to the socket part (11) through the blocking piece.

2. The ductile iron pipe jointing structure according to claim 1, characterized in that: The sealing member comprises a sealing ring (4); two annular platforms (14) are integrally formed on the outer peripheral surface of the socket part (11); an annular groove (15) for the sealing ring (4) to be sleeved is formed between the two annular platforms (14); the sealing ring (4) is rotatably connected to the socket part (11); the sealing ring (4) is provided with at least two second insertion holes (41); the first insertion hole (13) and the second insertion hole (41) correspond one to one; when the limiting column (3) is inserted into the socket part (11), the first insertion hole (13) and the corresponding second insertion hole (41) are coaxial.

3. The ductile iron pipe jointing structure according to claim 2, characterized in that: A switching notch (141) is formed on the outer periphery of one of the ring platforms (14), and an extension plate (42) is fixed to a side wall of the blocking ring (4), and the extension plate (42) is located in the switching notch (141); when the first insertion hole (13) and the corresponding second insertion hole (41) are coaxial, the extension plate (42) is located at one end of the switching notch (141), and when the extension plate (42) moves to the other end of the switching notch (141), the first insertion hole (13) and the corresponding second insertion hole (41) are misaligned.

4. The ductile iron pipe jointing structure according to claim 3, characterized in that: A filling plate (44) is provided between the extension plate (42) and the side wall of the switching notch (141), and sliding bars (441) are fixed to both end surfaces of the filling plate (44). The side wall of the extension plate (42) close to the filling plate (44) and the side wall of the switching notch (141) close to the filling plate (44) are both provided with sliding grooves adapted to the sliding bars (441).

5. The ductile iron pipe jointing structure according to claim 4, characterized in that: The inner peripheral surface of the socket portion (11) is integrally formed with a planar boss (16), and the outer peripheral surface of the plug portion (21) is formed with a cutout plane (211) that matches the planar boss (16).

6. The ductile iron pipe jointing structure according to claim 5, characterized in that: The inner wall of the sealing ring (4) is provided with a plurality of grooves, each of which is fixedly embedded with a sealing gasket (43). When the first insertion hole (13) and the corresponding second insertion hole (41) are misaligned, the sealing gasket (43) is sealed on the outside of the first insertion hole (13).

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