A ball-milled cast iron composite socket and spigot pipe-in-pipe joint
Patent Information
- Application Number
- CN202522148617.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-11
- Publication Date
- 2026-09-08
- Estimated Expiration
- 2035-10-11
AI Technical Summary
[0004]现有的球磨铸铁复合承插管内嵌式接头，其通常无环氧树脂、水泥砂浆或聚氨酯防腐层，即使一些设有防腐层的内嵌式接头，也仅是在接头内圈设置，在组装完成后，接口端面直面流体，外圈与管道内圈未到达密封处通常含水，缺少防腐层设置，只能依靠球墨铸铁自身防腐性进行防护，而污水管道内的污水成分复杂，导致接口容易出现腐蚀现象
1、本实用新型通过骨架和防腐套的设置，在骨架外设防腐套，骨架作为支撑基础，提高内嵌式接头的结构强度，防腐套作为保护层，能够包覆骨架的内圈、端面以及密封圈区域，减少污水冲刷和渗水对内嵌式接头产生的腐蚀，提高内嵌式接头的使用寿命；增加防腐性延长使用寿命；
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Figure CN224730288U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of socket joint technology, specifically to an embedded joint for a spheroidal cast iron composite socket tube. Background Technology
[0002] Ductile iron pipes, as core pipe materials in municipal water supply and drainage, industrial fluid transportation, and water conservancy projects, have their core advantages stemming from the modification process of cast iron materials. By adding spheroidizing agents such as magnesium and cerium, the flake graphite in traditional gray cast iron, which easily leads to stress concentration, is transformed into spheroidal graphite, significantly improving the tensile strength, toughness, and impact resistance of the material. At the same time, it retains the excellent corrosion resistance of cast iron itself, resulting in a longer service life. It performs better in scenarios such as bearing buried soil pressure, vehicle loads, and adapting to foundation settlement, and has become the mainstream choice for large-diameter fluid transportation pipelines, widely used in urban main water supply networks, sewage discharge systems, and industrial circulating water transportation.
[0003] The socket-embedded fitting is a component widely used for connecting ductile iron pipes. It is usually pre-embedded or installed inside the socket of the ductile iron pipe. The socket or spigot of the other ductile iron pipe to be connected can be directly inserted into the socket or spigot of the fitting. The tight connection between the pipes is achieved through the sealing structure such as the rubber ring of the fitting itself, which simplifies the installation process and effectively prevents media leakage.
[0004] Existing ductile iron composite socket pipe embedded joints typically lack epoxy resin, cement mortar, or polyurethane anti-corrosion layers. Even some embedded joints with anti-corrosion layers only have them on the inner ring. After assembly, the interface face is directly exposed to the fluid, and the outer ring and the inner ring of the pipe do not reach the sealing point, which usually contains water. Lacking an anti-corrosion layer, they can only rely on the corrosion resistance of ductile iron itself for protection. However, the sewage composition in sewage pipes is complex, making the interface prone to corrosion. Utility Model Content
[0005] Therefore, the purpose of this utility model is to provide a ductile iron composite socket-embedded joint to solve the technical problems mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a ductile iron composite socket pipe embedded joint, comprising a skeleton, wherein the skeleton is provided with an anti-corrosion sleeve, a bone ring and a groove on its exterior, and the anti-corrosion sleeve is provided with a groove and a backstop ring on its outer ring, and a sealing ring is connected inside the groove.
[0007] By adopting the above technical solutions, in daily use, the skeleton serves as a supporting foundation, improving the structural strength of the embedded joint. The anti-corrosion sleeve, as a protective layer, can cover the inner ring, end face, and sealing ring area of the skeleton, reducing the corrosion caused by sewage flushing and water seepage to the embedded joint and improving its service life. Furthermore, the anti-reverse ring increases the difficulty of the embedded joint's axial displacement from the ductile iron pipe, significantly increasing the installation stability of the embedded joint. At the same time, the skeleton can reinforce the anti-reverse ring, and the angle between the anti-reverse ring and the anti-corrosion sleeve is rounded, with the corners of the anti-reverse ring also rounded to reduce stress concentration and prevent damage to the anti-reverse ring.
[0008] Furthermore, the position of the bone ring corresponds to the position of the anti-retraction ring.
[0009] By adopting the above technical solution, the skeleton can strengthen the anti-locking ring, improve the structural strength of the anti-locking ring, and reduce the occurrence of phenomena such as cracking of the anti-locking ring.
[0010] Furthermore, the anti-reverse ring has a trapezoidal cross-section, and the anti-reverse ring and the anti-corrosion sleeve are connected by a rounded corner.
[0011] By adopting the above technical solution, the difficulty of the embedded joint axial displacement being dislodged from the ductile iron pipe is increased by the anti-reverse ring, which greatly increases the installation stability of the embedded joint. In addition, the corners of the anti-reverse ring are also rounded to reduce stress concentration and prevent damage to the anti-reverse ring.
[0012] Furthermore, multiple slots are provided, and all of the slots are connected to the anti-corrosion sleeve.
[0013] By adopting the above technical solution, the inner and outer rings of the skeleton are no longer smooth due to the slots. The presence of the bone ring forms an anchor point, which increases the stability of the connection between the anti-corrosion sleeve and the skeleton and reduces the occurrence of relative movement or even detachment between the anti-corrosion sleeve and the skeleton.
[0014] Furthermore, there are two grooves and two sealing rings, and the two grooves and sealing rings are symmetrically distributed.
[0015] By adopting the above technical solution, the sealing ring can fill the gap between the ductile iron composite pipe and the embedded joint, thus preventing leakage.
[0016] Furthermore, both the skeleton and the bone ring are made of ductile iron, and the bone ring is fixedly connected to the skeleton by welding.
[0017] By adopting the above technical solution, the workers welded the bone rings to the outer ring of the skeleton, and then the workers cut and polished multiple grooves in the inner and outer rings of the skeleton.
[0018] Furthermore, both the anti-corrosion sleeve and the anti-reverse ring are made of polyurethane material, and the anti-corrosion sleeve and the anti-reverse ring are fixedly connected to the skeleton and the bone ring by metal insert injection molding.
[0019] By adopting the above technical solution, the workers place the processed skeleton into the mold and inject polyurethane into the mold. After the polyurethane cures, it forms an anti-corrosion sleeve, and the mold cavity will automatically complete the formation of the groove and anti-reverse ring on the outer ring of the anti-corrosion sleeve.
[0020] Furthermore, the slot is arc-shaped, annular, or spiral-shaped.
[0021] By adopting the above technical solutions, the slot can be processed into an arc shape, a ring shape, or a spiral shape, all of which can increase the connection strength between the anti-corrosion sleeve and the skeleton.
[0022] Furthermore, multiple bone rings and anti-retraction rings are provided.
[0023] By adopting the above technical solution, increasing the number of retaining rings and anti-reverse rings increases the contact area between the anti-reverse rings and the inner wall of the ductile iron composite pipe, thereby increasing friction and improving the anti-reverse effect.
[0024] In summary, the present invention has the following main advantages: 1. This utility model, through the setting of a skeleton and an anti-corrosion sleeve, provides an anti-corrosion sleeve outside the skeleton. The skeleton serves as a supporting foundation, improving the structural strength of the embedded joint. The anti-corrosion sleeve serves as a protective layer, covering the inner ring, end face, and sealing ring area of the skeleton, reducing the corrosion caused by sewage flushing and water seepage to the embedded joint, and improving the service life of the embedded joint; increasing corrosion resistance and extending service life. 2. This utility model, through the setting of the skeleton ring and the anti-reverse ring, increases the difficulty of the axial displacement of the embedded joint from the ductile iron pipe by increasing the anti-reverse ring, which greatly increases the installation stability of the embedded joint, and the skeleton can reinforce the anti-reverse ring; thus increasing the stability of the embedded joint connection. 3. This utility model, through the setting of the slot, makes the inner and outer rings of the skeleton no longer smooth. With the presence of the bone ring, it forms an anchor point, which increases the stability of the connection between the anti-corrosion sleeve and the skeleton, reduces the phenomenon of relative movement or even detachment between the anti-corrosion sleeve and the skeleton, and increases the connection stability of the anti-corrosion sleeve. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 For the present utility model Figure 2 Enlarged view of the structure at point A in the image; Figure 4 This is a schematic diagram of the skeleton structure of this utility model.
[0026] In the diagram: 1. Skeleton; 2. Anti-corrosion sleeve; 3. Groove; 4. Sealing ring; 5. Bone ring; 6. Anti-reverse ring; 7. Slot. Detailed Implementation
[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0028] The embodiments of this utility model will be described below based on its overall structure. Example 1
[0029] A type of ductile iron composite socket fitting, such as Figures 1-4 As shown, the device includes a frame 1, with an anti-corrosion sleeve 2, a retaining ring 5, and multiple retaining grooves 7 on its exterior. Each retaining groove 7 connects to the anti-corrosion sleeve 2. Both the frame 1 and the retaining ring 5 are made of ductile iron. The retaining ring 5 is welded to the frame 1. An anti-reverse ring 6 is provided on the outer ring of the anti-corrosion sleeve 2, with the position of the retaining ring 5 corresponding to the position of the anti-reverse ring 6. The anti-reverse ring 6 has a trapezoidal cross-section, and a rounded corner is used between the anti-reverse ring 6 and the anti-corrosion sleeve 2. Both the anti-corrosion sleeve 2 and the anti-reverse ring 6 are made of polyurethane. The anti-corrosion sleeve 2 and the anti-reverse ring 6 are fixedly connected to the frame 1 and the retaining ring 5 by metal insert injection molding. The skeleton 1 serves as a supporting foundation, enhancing the structural strength of the embedded joint. The anti-corrosion sleeve 2 acts as a protective layer, covering the inner ring, end face, and sealing ring 4 area of the skeleton 1. This reduces the corrosion caused by sewage flushing and water seepage on the embedded joint, extending its service life. Furthermore, the anti-reverse ring 6 increases the difficulty of the embedded joint axially displacing from the ductile iron pipe, significantly improving the installation stability of the embedded joint. Simultaneously, the skeleton 1 reinforces the anti-reverse ring 6. The angle between the anti-reverse ring 6 and the anti-corrosion sleeve 2 is rounded, and the corners of the anti-reverse ring 6 are also rounded to reduce stress concentration and prevent damage to the anti-reverse ring 6.
[0030] See Figure 2 and Figure 3 In the above embodiment, the outer ring of the anti-corrosion sleeve 2 is provided with a groove 3, and a sealing ring 4 is connected inside the groove 3. There are two grooves 3 and two sealing rings 4, which are symmetrically distributed. The sealing ring 4 can fill the gap between the ductile iron composite pipe and the embedded joint to prevent leakage. Example 2
[0031] Based on the above embodiment one, the following settings are now adopted to increase flexibility.
[0032] See Figure 4 In the above embodiments, the slot 7 is arc-shaped, annular, or spiral-shaped. The slot 7 can be processed into an arc-shaped, annular, or spiral shape, which can increase the connection strength between the anti-corrosion sleeve 2 and the skeleton 1. Example 3
[0033] Based on the above embodiment one, in order to enhance the backlash prevention effect, the following settings are now implemented.
[0034] See Figures 1-4 In the above embodiments, multiple bone rings 5 and anti-reverse rings 6 are provided. By increasing the number of bone rings 5 and anti-reverse rings 6, the contact surface between the anti-reverse ring 6 and the inner wall of the ductile iron composite pipe is increased, thereby increasing the friction and improving the anti-reverse effect.
[0035] The implementation principle of this utility model is as follows: First, the workers weld the bone ring 5 to the outer ring of the skeleton 1. Then, the workers cut multiple grooves 7 in the inner and outer rings of the skeleton 1 by cutting, grinding and other methods. The grooves 7 are arc-shaped, annular, or spiral-shaped, serving as the anchoring base for the subsequent anti-corrosion sleeve 2. Then, the workers place the processed skeleton 1 into the mold and inject polyurethane into the mold. After the polyurethane cures, it forms the anti-corrosion sleeve 2. The mold cavity will cause the outer ring of the anti-corrosion sleeve 2 to automatically complete the forming of the groove 3 and the anti-reverse ring 6. Finally, the workers put the sealing ring 4 into the groove 3 to complete the production of the embedded connector. During assembly, workers first insert one end of the embedded connector into a ductile iron composite pipe using a hoist or other traction device. Finally, they use the same hoist or other traction device to place another ductile iron composite pipe over the other end of the embedded connector, thus completing the installation. During this process, the sealing ring 4 fills the gap between the ductile iron composite pipe and the embedded connector to prevent leakage. The anti-corrosion layer is made of polyurethane material, which is flexible and elastic. When the ductile iron pipe experiences slight displacement or deformation, or when the skeleton 1 experiences slight deformation, the anti-corrosion sleeve 2 can disperse the stress, reducing the occurrence of excessive stress and cracking caused by hard contact at the connection. In daily use, the skeleton 1 serves as a supporting foundation, improving the structural strength of the embedded joint. The anti-corrosion sleeve 2 acts as a protective layer, covering the inner ring, end face, and sealing ring 4 area of the skeleton 1, reducing the corrosion caused by sewage flushing and water seepage on the embedded joint, and improving the service life of the embedded joint. Furthermore, the anti-reverse ring 6 increases the difficulty of the embedded joint axially displacing from the ductile iron pipe, significantly increasing the installation stability of the embedded joint. At the same time, the skeleton 1 can reinforce the anti-reverse ring 6. The angle between the anti-reverse ring 6 and the anti-corrosion sleeve 2 is rounded, and the corners of the anti-reverse ring 6 are also rounded to reduce stress concentration and prevent damage to the anti-reverse ring 6.
[0036] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.
Claims
1. A ductile iron composite socket fitting, comprising a skeleton (1), characterized in that: The skeleton (1) is provided with an anti-corrosion sleeve (2), a bone ring (5) and a groove (7) on the outside, and the anti-corrosion sleeve (2) is provided with a groove (3) and a backstop ring (6) on the outer ring, and a sealing ring (4) is connected inside the groove (3).
2. The ductile iron composite socket-type connector according to claim 1, characterized in that: The position of the bone ring (5) corresponds to the position of the anti-retraction ring (6).
3. The ductile iron composite socket-type connector according to claim 2, characterized in that: The anti-reverse ring (6) has a trapezoidal cross section, and the anti-reverse ring (6) and the anti-corrosion sleeve (2) are connected by a rounded corner.
4. The ductile iron composite socket-type connector according to claim 1, characterized in that: The card slot (7) is provided in multiple ways, and all of the card slots (7) are connected to the anti-corrosion sleeve (2).
5. The ductile iron composite socket-type connector according to claim 1, characterized in that: Two grooves (3) and two sealing rings (4) are provided, and the two grooves (3) and two sealing rings (4) are symmetrically distributed.
6. The ductile iron composite socket-type connector according to claim 1, characterized in that: The skeleton (1) and the bone ring (5) are both made of ductile iron, and the bone ring (5) is fixedly connected to the skeleton (1) by welding.
7. The ductile iron composite socket-type connector according to claim 6, characterized in that: The anti-corrosion sleeve (2) and the anti-reverse ring (6) are both made of polyurethane material, and the anti-corrosion sleeve (2) and the anti-reverse ring (6) are fixedly connected to the skeleton (1) and the bone ring (5) by metal insert injection molding.
8. The ductile iron composite socket-type connector according to claim 4, characterized in that: The slot (7) is arc-shaped, ring-shaped or spiral-shaped.
9. The ductile iron composite socket-type connector according to claim 3, characterized in that: Multiple bone rings (5) and anti-retraction rings (6) are provided.