A stainless steel ferrule type pipe joint sealing mechanism

Abstract

The utility model relates to the technical field of the sealing of the pipe joint of the clamping sleeve type, especially to a sealing mechanism of the pipe joint of the clamping sleeve type of stainless steel, including pipe joint, the pipe joint joint place is inlayed with the clamping ring, the clamping ring outer surface is fixedly connected with the blade ring of reinforced sealing, the clamping ring is inlayed with the clamping ring, the pipe joint joint place is connected with the nut with screw thread, the pipe joint joint place is inserted with the connecting pipe, and the connecting pipe is located in the clamping ring, the blade ring and the nut inside. The utility model discloses the clamping ring, the clamping ring and the connecting pipe are in turn set in the pipe joint, then the nut is twisted, make it push the clamping ring and the clamping ring extrude into the pipe joint, the clamping ring front end and the connecting pipe outer wall contact and extrude and form the irreversible plastic deformation, form the first sealing interface, then the blade ring on the clamping ring is embedded the connecting pipe outer surface, form the second sealing groove, the clamping ring is extruded also with deformation, form the third sealing interface, thereby realize triple seal, improve its overall sealing effect, avoid the situation of leakage.

Description

Technical Field

[0001] This utility model relates to the field of ferrule-type pipe fitting sealing technology, and in particular to a stainless steel ferrule-type pipe fitting sealing mechanism. Background Technology

[0002] Stainless steel compression fittings, with their metal-to-metal mechanical sealing properties, eliminate the need for easily aging seals and are widely used in high-temperature (-200℃~550℃) and high-pressure (0~63MPa) applications such as hydraulic and chemical industries. They utilize the axial force of the nut to plastically deform the ferrule, allowing the cutting edge to cut into the steel pipe and form a double seal with the conical surface of the fitting body, thus combining sealing and fixing functions.

[0003] Traditional ferrules rely on the interlocking of cutting edges and the contact of conical surfaces for sealing. However, under long-term vibration conditions, the high-frequency shaking of the pipeline can easily cause tiny gaps to form between the ferrule and the steel pipe or fitting body. This weakens the interlocking force of the cutting edges, damages the sealing performance of the conical surface, and drastically increases the risk of leakage under high pressure. Furthermore, traditional structures lack vibration compensation mechanisms. Once a gap appears at the sealing interface, it cannot be elastically filled by the structure itself, requiring manual retightening for maintenance, which increases equipment downtime costs. Secondly, the sealing effect depends on manual control of the insertion depth and tightening torque. Judging by feel can easily lead to insufficient insertion or over-tightening, causing seal failure. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a stainless steel ferrule-type pipe joint sealing mechanism, which solves the technical problems of existing ferrule-type pipe joints being prone to gaps under long-term vibration conditions, leading to sealing failure, lacking vibration compensation, and relying entirely on feel during manual assembly, which is prone to errors that cause sealing failure.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a stainless steel compression fitting sealing mechanism, including a pipe fitting, a retaining ring fitted at the joint of the pipe fitting, a blade ring for enhancing sealing fixed to the outer surface of the retaining ring, a retaining ring fitted inside the retaining ring, a nut threadedly connected at the joint of the pipe fitting, and a connecting pipe inserted at the joint of the pipe fitting, wherein the connecting pipe is located inside the retaining ring, the blade ring and the nut.

[0006] A further improvement is that the pipe joint has a tapered surface at the joint, the retaining ring is a tapered structure adapted to the tapered surface, and the retaining ring is a tapered structure adapted to the tapered surface inside the retaining ring.

[0007] A further improvement is that the outer end face of the blade ring is inclined toward the center of the retaining ring, forming an angle of 2°-5° with the radial direction of the retaining ring.

[0008] A further improvement is that the retaining ring is provided with an elastic metal foil along its annular outer surface, and the elastic metal foil is made of beryllium bronze foil.

[0009] A further improvement is that the inner wall of the pipe joint is fixedly connected to an abutment platform, and an insertion groove is provided on the abutment platform. A sealing insertion ring adapted to the insertion groove is fixedly connected to the end of the connecting pipe.

[0010] A further improvement is that the inner wall of the nut is provided with a spring hole, a spring is fixedly connected to the inner wall of the spring hole, a locking rod is fixedly connected to the end of the spring and slidably disposed in the spring hole, and a positioning groove adapted to the locking rod is provided on the connecting pipe.

[0011] By employing the above technical solution, this utility model provides a stainless steel ferrule-type pipe joint sealing mechanism, which has at least the following beneficial effects: 1. This utility model involves sequentially fitting a retaining ring, a retaining ring, and a connecting tube into a pipe joint, and then tightening the nut to push the retaining ring and retaining ring into the pipe joint. At this time, the front end of the retaining ring contacts the outer wall of the connecting tube and is squeezed to form an irreversible plastic deformation, forming the first sealing interface. Subsequently, the cutting ring on the retaining ring is embedded into the outer surface of the connecting tube to form the second sealing groove. The retaining ring is also squeezed and deformed to form the third sealing interface, thereby achieving triple sealing, improving the overall sealing effect, and preventing leakage.

[0012] 2. When the pipe joint and connecting pipe are subjected to vibration, the elastic metal foil can effectively compensate for the gap caused by the vibration through its own elastic deformation, thereby maintaining the overall sealing effect. Among them, the beryllium bronze foil has a high elastic limit and is not prone to fatigue failure under long-term vibration.

[0013] 3. When the nut is screwed to the preset value, the locking rod is perpendicular to the positioning groove. At this time, the spring returns to its original position under its own elasticity, pushing the locking rod into the positioning groove. A slight clicking sound will be heard at this time to remind the operator that the assembly has been completed, so as to avoid insufficient or excessive screwing, which may lead to sealing failure. Attached Figure Description

[0014] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0015] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall disassembled structure of this utility model; Figure 3 This is an independent schematic diagram of the retaining ring and retaining clasp and their structures according to this utility model; Figure 4 This is a cross-sectional view of the nut structure of this utility model; Figure 5This is a cross-sectional view of the pipe connector of this utility model.

[0016] In the diagram: 1. Pipe fitting; 2. Snap ring; 3. Blade ring; 4. Snap ring; 5. Nut; 51. Spring hole; 52. Spring; 53. Locking rod; 54. Positioning groove; 6. Connecting pipe; 61. Abutment platform; 62. Insertion groove; 63. Sealing insertion ring; 7. Elastic metal foil. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example 1 Given that existing compression fittings are prone to gap formation under long-term vibration, leading to seal failure and lack of vibration compensation, and that manual assembly relies entirely on feel, errors can easily cause seal failure, this embodiment provides a stainless steel compression fitting sealing mechanism. This mechanism improves the overall sealing effect through triple-locking sealing, and utilizes the automatic rebound filling of elastic metal foil to maintain the clamping force of the retaining ring on the pipe, thus providing vibration compensation and preventing gaps caused by vibration that could lead to leakage. Furthermore, a snap-fit ​​structure is incorporated; when the nut is tightened to a preset angle, it automatically snaps into place, preventing over-tightening and subsequent seal failure. Please refer to... Figures 1-5 The stainless steel compression fitting sealing mechanism includes a pipe fitting 1, a retaining ring 2 fitted at the joint of the pipe fitting 1, a blade ring 3 for enhancing sealing fixed to the outer surface of the retaining ring 2, a retaining ring 4 fitted inside the retaining ring 2, a nut 5 threadedly connected at the joint of the pipe fitting 1, and a connecting pipe 6 inserted at the joint of the pipe fitting 1, with the connecting pipe 6 located inside the retaining ring 2, the blade ring 3 and the nut 5.

[0019] The pipe fitting 1 has a tapered surface at the joint. The retaining ring 2 is a tapered structure adapted to the tapered surface, and the retaining ring 4 is a tapered structure adapted to the inner tapered surface of the retaining ring 2. The retaining ring 2 is fitted into the tapered surface of the pipe fitting 1, and then the retaining ring 4 is fitted into the retaining ring 2. The nut 5 is then screwed into the pipe fitting 1. At this time, the connecting pipe 6 is inserted into the pipe fitting 1. Then, the nut 5 is turned with a wrench, which pushes the retaining ring 4 and the retaining ring 2 into the pipe fitting 1. At this time, the front end of the retaining ring 2 contacts the outer wall of the connecting pipe 6 and is squeezed to form irreversible plastic deformation, forming the first sealing interface. Then, the blade ring 3 on the retaining ring 2 is embedded into the outer surface of the connecting pipe 6, forming the second sealing groove. The retaining ring 4 is also squeezed and deformed, forming the third sealing interface, thereby achieving triple sealing, improving the overall sealing effect and avoiding leakage.

[0020] Specifically, the outer end face of the blade ring 3 is inclined toward the center of the retaining ring 2, forming an angle of 2°-5° with the radial direction of the retaining ring 2; the inclined blade ring 3 is more likely to cut into the connecting pipe 6 when it is squeezed, thereby achieving a better sealing effect.

[0021] Because long-term vibration of the pipe joint 1 and the connecting pipe 6 can cause tiny gaps between them, leading to sealing failure, the retaining ring 4 is provided with an elastic metal foil 7 along its annular outer surface. The elastic metal foil 7 is made of beryllium bronze foil. When the pipe joint 1 and the connecting pipe 6 are vibrated, the elastic metal foil 7 can effectively compensate for the gaps caused by the vibration through its own elastic deformation, thereby maintaining the overall sealing effect. The beryllium bronze foil has a high elastic limit and is not prone to fatigue failure under long-term vibration.

[0022] To avoid over-insertion or loose connection when manually inserting the connecting pipe 6, an abutment platform 61 is fixed to the inner wall of the pipe joint 1. The abutment platform 61 has an insertion groove 62. A sealing insertion ring 63 that matches the insertion groove 62 is fixed to the end of the connecting pipe 6. When the connecting pipe 6 is inserted into the pipe joint 1, its end abuts against the abutment platform 61 inside the pipe joint 1, thereby completing the insertion work. At the same time, the sealing insertion ring 63 at the end of the connecting pipe 6 is inserted into the insertion groove 62 on the abutment platform 61, thereby completing the sealing connection and further improving its sealing effect.

[0023] Example 2 Because manual assembly and tightening of the nut 5 relies entirely on feel, it is easy to undertighten or overtighten, leading to seal failure. Therefore, based on Example 1, as... Figures 1-5As shown, the inner wall of the nut 5 has a spring hole 51, and a spring 52 is fixedly connected to the inner wall of the spring hole 51. A locking rod 53, which slides in the spring hole 51, is fixedly connected to the end of the spring 52. A positioning groove 54 that matches the locking rod 53 is provided on the connecting pipe 6. When the nut 5 is turned to the preset value, the locking rod 53 is perpendicular to the positioning groove 54. At this time, the spring 52 returns to its original position under its own elasticity, pushing the locking rod 53 into the positioning groove 54. At this time, a slight clicking sound will be heard, reminding the operator that the assembly has been completed, so as to avoid insufficient or excessive turning, which may lead to sealing failure.

[0024] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stainless steel compression fitting sealing mechanism, comprising a fitting (1), characterized in that: The pipe joint (1) has a retaining ring (2) fitted at the joint, and a blade ring (3) for enhanced sealing is fixed to the outer surface of the retaining ring (2). A retaining ring (4) is fitted inside the retaining ring (2). A nut (5) is threaded at the joint of the pipe joint (1). A connecting pipe (6) is inserted at the joint of the pipe joint (1), and the connecting pipe (6) is located inside the retaining ring (2), the blade ring (3) and the nut (5).

2. The stainless steel compression fitting sealing mechanism according to claim 1, characterized in that: The pipe joint (1) has a tapered surface at the joint, the retaining ring (2) is a tapered structure that matches the tapered surface, and the retaining ring (4) is a tapered structure that matches the tapered surface inside the retaining ring (2).

3. The stainless steel compression fitting sealing mechanism according to claim 1, characterized in that: The outer end face of the blade ring (3) is inclined toward the center of the retaining ring (2), forming an angle of 2°-5° with the radial direction of the retaining ring (2).

4. The stainless steel compression fitting sealing mechanism according to claim 1, characterized in that: The retaining ring (4) is provided with an elastic metal foil (7) along its annular outer surface. The elastic metal foil (7) is made of beryllium bronze foil.

5. The stainless steel compression fitting sealing mechanism according to claim 1, characterized in that: The inner wall of the pipe joint (1) is fixed with an abutment platform (61), and an insertion groove (62) is provided on the abutment platform (61). A sealing insertion ring (63) that matches the insertion groove (62) is fixed to the end of the connecting pipe (6).

6. The stainless steel compression fitting sealing mechanism according to claim 1, characterized in that: The inner wall of the nut (5) is provided with a spring hole (51), a spring (52) is fixedly connected to the inner wall of the spring hole (51), and a locking rod (53) is fixedly connected to the end of the spring (52) and slidably disposed in the spring hole (51). A positioning groove (54) adapted to the locking rod (53) is provided on the connecting pipe (6).

Images