End face corrosion resistant metal crimp connection fitting
Patent Information
- Application Number
- CN202611411143.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-11
- Publication Date
- 2026-11-03
AI Technical Summary
When existing metal crimped pipe fittings are cut at the construction site, the pipe end face is exposed to the fluid medium, leading to corrosion problems and potential safety hazards such as leakage and reduced strength.
An inner ring is used in conjunction with the main pipe fitting to form an end-face sealing and corrosion-resistant structure. The medium is blocked by a double anaerobic adhesive sealing layer. Combined with internal and external clamping and fixing, the end face of the pipe is sealed and corrosion-resistant, and the connection strength is improved.
It effectively avoids corrosion of pipe ends, eliminates joint leakage, improves the crimping strength and overall pressure bearing capacity of pipe fittings, and ensures the sealing and corrosion resistance of the connection.
Smart Images
Figure CN123028271A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of pipeline connection technology, specifically relating to an end-face anti-corrosion metal crimp connection fitting. Background Technology
[0002] Thin-walled metal pipes such as galvanized nickel steel pipes and plastic-coated steel pipes are widely used in fluid transport systems such as water supply, drainage, and fire protection. On construction sites, pipes need to be cut to the actual length of the pipeline, directly exposing the metal layer at the pipe ends. Due to limitations at the construction site, it is difficult to effectively protect the exposed pipe ends from corrosion. The fluid medium will directly corrode the exposed pipe ends, causing end-face corrosion, which not only poses a safety hazard of pipeline leakage but also reduces the overall strength of the crimped joints.
[0003] Existing metal crimp fittings generally include various crimp connection methods such as clamping, ring crimping, ring clamping, and locking ring (spring clip) type ring clamping. These methods rely on the radial compression deformation of the fitting's outer wall to grip and seal the pipe. Traditional crimp fittings only clamp and seal the outer wall of the pipe, leaving the cut end face of the pipe exposed within the fluid flow channel. This continuous corrosion of the pipe end face by the medium leads to joint failure. Summary of the Invention
[0004] To address the aforementioned problems in the existing technology, this invention provides an end-face anti-corrosion metal crimping connection fitting. The fitting forms an end-face sealing and anti-corrosion structure through an inner ring that mates with the main pipe fitting. A double anaerobic adhesive sealing layer effectively isolates the medium, preventing fluid corrosion of the pipe end face and eliminating the risk of joint leakage. Simultaneously, it enables bidirectional clamping and fixing of the pipe from both inside and outside, significantly improving the crimping strength, anti-detachment performance, and overall pressure-bearing capacity of the pipeline. The fitting features a compact structure and excellent sealing and anti-corrosion performance.
[0005] To achieve the above objectives, the present invention provides the following technical solution: an end-face anti-corrosion metal crimping connection fitting, comprising a main pipe fitting, wherein both ends of the main pipe fitting are integrally formed with annular limiting steps along the circumference; Both ends of the main pipe fitting have annular clamping parts integrally formed along the circumference, and the clamping parts are fitted with clamping sealing rings. By pressing the annular clamping parts to squeeze the clamping sealing rings, a clamping sealing connection with the outer wall of the pipe can be achieved. The end-face anti-corrosion metal crimping connection accessory also includes an inner sleeve ring, which is a cylindrical structure with different diameters, the front section being a small diameter section and the rear section being a large diameter section. The large-diameter section is inserted into the end wall of the main pipe fitting, and the rear end of the large-diameter section is axially limited and supported by the limiting step. The outer wall of the large-diameter section is provided with an annular sealing part along the circumference. The outer circumferential surface of the annular sealing part is integrally formed with n sets of annular grooves, n≥1. The interior of the annular grooves is provided with an anaerobic adhesive layer. The outer wall of the large-diameter section is bonded and sealed to the inner wall of the main pipe fitting through the anaerobic adhesive layer. A U-shaped insertion cavity is formed between the outer wall of the small-diameter section and the inner wall of the main pipe, for the insertion of the end of the metal pipe to be connected, and can form a seal and corrosion protection on the end face of the metal pipe to be connected. The outer wall of the small-diameter section is provided with an annular sealing part II along the circumference. The outer circumferential surface of the annular sealing part II is integrally formed with n sets of annular grooves II, n≥1. The interior of the annular grooves II is provided with an anaerobic adhesive layer II. The outer wall of the small-diameter section can be bonded and sealed to the inner wall of the metal pipe to be connected through the anaerobic adhesive layer II.
[0006] As a type of end-face anti-corrosion metal crimp connection fitting of the present invention, the main pipe fitting is a metal crimp fitting, which is one of elbow or straight, tee or flange joint. In addition to the crimp connection structure, it can also adopt one of the following crimp connection structures: ring crimp, ring crimp, locking ring crimp, locking ring ring crimp or locking ring ring crimp.
[0007] As a type of end-face anti-corrosion metal crimping connection accessory of the present invention, the crimping sealing ring is an O-ring made of rubber.
[0008] As a preferred technical solution of the end-face anti-corrosion metal crimping connection accessory of the present invention, the inner ring is a metal component, and the height of the radial step formed between the small diameter section and the large diameter section is equal to the wall thickness of the metal pipe to be connected.
[0009] As a preferred technical solution for an end-face anti-corrosion metal crimping connection accessory of the present invention, the outer wall of the large-diameter section can also be sealed to the inner wall of the main pipe by means of an annular groove with an embedded rubber O-ring or by direct welding.
[0010] As a preferred technical solution for an end-face anti-corrosion metal crimping connection accessory of the present invention, the outer wall of the small diameter section can also be sealed with the inner wall of the metal pipe to be connected by using an annular groove with an embedded rubber O-ring.
[0011] As a preferred technical solution of the end-face anti-corrosion metal crimping connection accessory of the present invention, after the outer side of the small diameter section corresponds to the outer wall of the main pipe fitting, the outer wall of the main pipe fitting undergoes radial shrinkage deformation. After shrinkage, the pipe wall of the main pipe fitting is pressed inward, holding the small diameter section and the metal pipe to be connected inserted into the U-shaped insertion cavity, which can achieve a dual enhancement of end-face sealing performance and connection strength.
[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention provides an inner ring, which is integrally formed by a large-diameter section and a small-diameter section, inside the end of the main pipe fitting. The cut end face of the pipe can be completely housed in the U-shaped cavity formed between the small-diameter section of the inner ring and the main pipe fitting. The pipe fluid is sealed and blocked by the annular sealing part with an anaerobic adhesive layer II on the outside of the small-diameter section and the annular sealing part with an anaerobic adhesive layer I on the outside of the large-diameter section. This can greatly improve the sealing tightness at the port, prevent the fluid from contacting the exposed cut end face of the pipe, structurally avoid the corrosion of the medium on the pipe end face, and eliminate the safety hazards of joint corrosion and leakage.
[0013] 2. The outer wall of the small-diameter section of the inner ring of the present invention is connected to the inner wall of the pipe, which can form an inner support for the pipe. Furthermore, by pressing the outer wall of the main pipe fitting corresponding to the small-diameter section, the outer wall of the pipe can be further tightened, forming a two-way clamping structure between the inner and outer sides of the pipe. This can effectively improve the axial connection strength of the pressing part, enhance the anti-detachment ability of the pipe socket and the pressure bearing capacity of the pipeline. Attached Figure Description
[0014] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall cross-sectional structure of the present invention; Figure 2 This is a schematic diagram of the end cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the inner ring of the present invention; Figure 4 This is a partial cross-sectional structural diagram of the connection between the present invention and the pipe. Figure 5 This is a partial cross-sectional schematic diagram of the connection between the inner ring and the metal compression fitting with a ring-press structure. Figure 6 This is a partial cross-sectional schematic diagram of the connection between the pipe and the metal crimp fitting with a ring-press structure. Figure 7 This is a partial cross-sectional view of the connection between the inner sleeve ring and the metal crimp fitting with a ring clamping structure according to the present invention. Figure 8 This is a partial cross-sectional schematic diagram of the connection between the pipe and the metal crimp fitting using a ring-clamp structure. Figure 9 This is a partial cross-sectional schematic diagram of the connection between the inner sleeve ring and the metal crimping fitting with a locking ring-type crimping structure. Figure 10 This is a partial cross-sectional schematic diagram of the connection between the pipe and the metal crimp fitting with a locking ring type crimping structure.
[0015] In the diagram: 1. Main pipe fitting; 2. Limiting step; 3. Clamping part; 4. Clamping sealing ring; 5. Inner ring; 6. Large diameter section; 7. Annular sealing part one; 8. Annular groove one; 9. Anaerobic adhesive layer one; 10. Small diameter section; 11. Annular sealing part two; 12. Annular groove two; 13. Anaerobic adhesive layer two; 14. Annular pressing part; 15. Annular pressing sealing ring; 16. Locking part; 17. Snap ring. Detailed Implementation
[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0017] Example Please see Figure 1-10 The present invention provides the following technical solution: a metal crimping connection fitting with anti-corrosion end face, comprising a main pipe fitting 1, wherein the main pipe fitting 1 is a conventional type of metal crimping fitting, which is one of an elbow or straight, tee or flange joint, and the crimping connection structure is a press-fit (see reference). Figure 1 , Figure 2 and Figure 4 (as shown) or ring compression (refer to) Figure 5 and Figure 6 As shown), ring clamping (refer to) Figure 7 and Figure 8 As shown), locking ring type ring clamping (refer to) Figure 9 and Figure 10 As shown in the figure, there is one of the locking ring type crimping and the locking ring type ring crimping. The crimping structure is composed of crimping part 3 and crimping sealing ring 4. The ring crimping structure is composed of ring crimping part 14 and ring crimping sealing ring 15. The locking ring structure is composed of locking part 16 and snap ring 17 (and a limiting groove adapted to snap ring 17 is provided on the outer wall of the pipe to be connected). These are existing technical structures in the field and will not be described in detail here.
[0018] Reference Figure 1 , Figure 2 and Figure 4 As shown, further, the main diagram in this implementation scheme ( Figure 1The elbow-type metal crimp pipe fitting adopts a crimping connection structure. Both ends of the main pipe fitting 1 are integrally formed with annular limiting steps 2 along the circumference, and both ends of the main pipe fitting 1 are integrally formed with annular crimping parts 3 along the circumference. The crimping parts 3 are fitted with crimping sealing rings 4. The crimping sealing rings 4 are rubber O-rings. By crimping the annular crimping parts 3 to compress the crimping sealing rings 4, a crimping sealing connection with the outer wall of the pipe can be achieved.
[0019] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the end-face anti-corrosion metal crimping connection accessory further includes an inner ring 5. The inner ring 5 is a metal component and has a cylindrical structure with different diameters. The front section is a small diameter section 10, and the rear section is a large diameter section 6.
[0020] The large-diameter section 6 is inserted into the end wall of the main pipe fitting 1, and the rear end of the large-diameter section 6 is axially limited and supported by the limiting step 2, which can prevent the inner sleeve ring 5 from moving back and retracting into the deep interior of the main pipe fitting 1 when the metal pipe is connected. The outer wall of the large-diameter section 6 is provided with an annular sealing part 7 along the circumference. The outer circumferential surface of the annular sealing part 7 is integrally formed with n sets of annular grooves 8, n≥1. The interior of the annular grooves 8 is provided with an anaerobic adhesive layer 9. The outer wall of the large-diameter section 6 is bonded and sealed to the inner wall of the main pipe fitting 1 through the anaerobic adhesive layer 9. The outer wall of the large-diameter section 6 can also be sealed to the inner wall of the main pipe fitting 1 by embedding a rubber O-ring in the annular grooves 8 or by direct welding.
[0021] The radial step height formed between the small diameter section 10 and the large diameter section 6 is equal to the wall thickness of the metal pipe to be connected. A U-shaped insertion cavity is formed between the outer wall of the small diameter section 10 and the inner wall of the main pipe fitting 1, for the end of the metal pipe to be connected to be inserted, and can form a seal and corrosion protection on the end face of the metal pipe to be connected. The outer wall of the small diameter section 10 is provided with an annular sealing part 2 11 along the circumference. The outer circumferential surface of the annular sealing part 2 11 is integrally formed with n sets of annular grooves 2 12, n≥1. The interior of the annular grooves 2 12 is provided with an anaerobic adhesive layer 2 13. The outer wall of the small diameter section 10 can be bonded and sealed to the inner wall of the metal pipe to be connected through the anaerobic adhesive layer 2 13. The outer wall of the small diameter section 10 can also be sealed to the inner wall of the metal pipe to be connected by embedding a rubber O-ring in the annular grooves 2 12.
[0022] During assembly and connection: First, insert the inner sleeve 5 into the end of the main pipe fitting 1, and seal it with anaerobic adhesive, O-ring or welding on the outer wall of the large diameter section 6. Then, insert the end of the metal pipe to be connected into the U-shaped cavity between the outer wall of the small diameter section 10 and the inner wall of the main pipe fitting 1, and make the inner wall of the pipe and the outer wall of the small diameter section 10 form a sealed connection with anaerobic adhesive or O-ring. Then, a special hydraulic tool is used to radially mechanically compress the outer wall of the main pipe fitting 1 at the position of the rubber ring. The main pipe fitting 1 undergoes radial contraction deformation to hug the pipe and form a sealed connection of the pipeline system. To further improve the pressure-bearing capacity, axial connection strength, and sealing performance of the pipe end face of the pipeline system, further mechanical compression can be performed on the outer wall of the main pipe fitting 1 corresponding to the small diameter section 10, so that the small diameter section 10 and the pipe can be better compressed and sealed, thereby improving the overall axial connection strength, pressure-bearing capacity, and end face corrosion resistance, resulting in a better overall performance.
[0023] In summary, this invention provides an inner ring 5, which is integrally formed by a large-diameter section 6 and a small-diameter section 10, inside the end of the main pipe fitting 1. The cut end face of the pipe can be completely housed in the U-shaped cavity formed between the small-diameter section 10 of the inner ring 5 and the main pipe fitting 1. The annular sealing part 11 with an anaerobic adhesive layer 2 13 on the outside of the small-diameter section 10 and the annular sealing part 7 with an anaerobic adhesive layer 1 9 on the outside of the large-diameter section 6 can seal and block the pipeline fluid, which can greatly improve the sealing tightness at the port, prevent the fluid from contacting the exposed cut end face of the pipe, structurally avoid the corrosion of the medium on the pipe end face, and eliminate the safety hazard of joint corrosion and leakage.
[0024] Meanwhile, by connecting the outer wall of the small-diameter section 10 of the inner ring 5 to the inner wall of the pipe, an inner support can be formed for the pipe. Furthermore, by pressing the outer wall of the main fitting 1 of the corresponding small-diameter section 10, the outer wall of the pipe can be further tightened, forming a two-way clamping structure between the inner and outer sides of the pipe. This can effectively improve the axial connection strength of the pressing part, enhance the anti-detachment capability of the pipe socket, and improve the pressure bearing capacity of the pipeline.
[0025] In addition, all content not described in detail in this embodiment falls within the scope of existing technology and common knowledge.
[0026] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A metal crimping fitting with anti-corrosion end face, comprising a main pipe fitting (1), characterized in that: Both ends of the main pipe (1) are integrally formed with annular limiting steps (2) along the circumference. Both ends of the main pipe fitting (1) are integrally formed with annular clamping parts (3) along the circumference, and the clamping parts (3) are fitted with clamping sealing rings (4). By pressing the annular clamping parts (3) to squeeze the clamping sealing rings (4), a clamping sealing connection with the outer wall of the pipe can be achieved. The end-face anti-corrosion metal crimping connection fitting also includes an inner ring (5), which is a cylindrical structure with different diameters, the front section being a small diameter section (10) and the rear section being a large diameter section (6). The large-diameter section (6) is inserted into the end wall of the main pipe (1), and the rear end of the large-diameter section (6) is axially limited and supported by the limiting step (2). The outer wall of the large-diameter section (6) is provided with an annular sealing part (7) along the circumference. The outer circumferential surface of the annular sealing part (7) is integrally formed with n sets of annular grooves (8), n≥1. The interior of the annular grooves (8) is provided with an anaerobic adhesive layer (9). The outer wall of the large-diameter section (6) is bonded and sealed to the inner wall of the main pipe (1) through the anaerobic adhesive layer (9). A U-shaped insertion cavity is formed between the outer wall of the small diameter section (10) and the inner wall of the main pipe fitting (1), for the end of the metal pipe to be connected to be inserted, and can form a seal and corrosion protection on the end face of the metal pipe to be connected. The outer wall of the small diameter section (10) is provided with an annular sealing part two (11) along the circumference. The outer circumferential surface of the annular sealing part two (11) is integrally formed with n sets of annular grooves two (12), n≥1. The interior of the annular groove two (12) is provided with an anaerobic adhesive layer two (13). The outer wall of the small diameter section (10) can be bonded and sealed to the inner wall of the metal pipe to be connected through the anaerobic adhesive layer two (13).
2. The end-face anti-corrosion metal crimp connection fitting according to claim 1, characterized in that: The main pipe fitting (1) is a metal crimp fitting, which is one of elbow or straight, tee or flange joint. In addition to the crimping connection structure, it can also adopt one of the following crimping connection structures: ring crimping, ring crimping, lock ring crimping, lock ring ring crimping or lock ring ring crimping.
3. The end-face anti-corrosion metal crimp connection fitting according to claim 1, characterized in that: The compression sealing ring (4) is an O-ring made of rubber.
4. The end-face anti-corrosion metal crimp connection fitting according to claim 1, characterized in that: The inner ring (5) is a metal component, and the height of the radial step formed between the small diameter section (10) and the large diameter section (6) is equal to the wall thickness of the metal pipe to be connected.
5. The end-face anti-corrosion metal crimp connection fitting according to claim 1, characterized in that: The outer wall of the large diameter section (6) can also be sealed to the inner wall of the main pipe (1) by embedding a rubber O-ring in an annular groove (8) or by direct welding.
6. The end-face anti-corrosion metal crimp connection fitting according to claim 1, characterized in that: The outer wall of the small diameter section (10) can also be sealed with the inner wall of the metal pipe to be connected by embedding a rubber O-ring in the annular groove (12).
7. The end-face anti-corrosion metal crimp connection fitting according to claim 1, characterized in that: After the outer wall of the main pipe fitting (1) corresponding to the small diameter section (10) is formed by external force pressing, the outer wall of the main pipe fitting (1) undergoes radial shrinkage deformation. After shrinkage, the pipe wall of the main pipe fitting (1) is pressed inward, holding the small diameter section (10) and the metal pipe to be connected inserted into the U-shaped insertion cavity, which can achieve a double enhancement of end face sealing performance and connection strength.