Metal collar with sealing structure

Abstract

The utility model relates to pipeline connection and sealing technical field especially relates to a metal ferrule with sealing structure, including flange plate, metal ferrule, top ring and air bag, flange plate is composed of bottom disc and the pipe body of vertical fixed connection in the center of bottom disc, metal ferrule is slid with clearance fit mode and is set in the pipe body outside of flange plate, the top outside of metal ferrule is equipped with top ring, and the top of metal ferrule and the bottom of top ring are reserved annular assembly gap, and the annular assembly gap is assembled with air bag, and the top side wall of metal ferrule is provided with the gap. Through annular protruding step and the cooperation of support ring, the sealing ring is pressed tightly, and the first sealing between metal ferrule and flange plate is formed, the air bag is tightly attached to the outer wall of pipeline through inflation, and the second sealing between metal ferrule and pipeline is formed, and the sealing reliability of pipeline connection is significantly improved through the common action of both, and effectively prevents gas or liquid leakage.

Description

Technical Field

[0001] This utility model relates to the field of pipeline connection and sealing technology, and in particular to a metal collar with a sealing structure. Background Technology

[0002] In various industrial pipeline systems and fluid transport equipment, the sealing of the connection between the pipeline and the equipment port is a crucial link in ensuring the safe and reliable operation of the system. Traditional connection methods often use flanges directly clamping gaskets or rely on mechanical fastening methods such as threads and clamps to achieve sealing. These methods generally have the following shortcomings: First, they require high machining accuracy and alignment between the pipeline and the equipment port; even slight installation deviations can easily lead to poor sealing and leakage points. Second, traditional static sealing structures (such as gaskets) have limited ability to compensate for and adapt to minor displacements or deformations of the pipeline caused by temperature, pressure fluctuations, or vibrations, and are prone to seal fatigue failure under long-term use. Third, in some situations where frequent disassembly or replacement of pipelines is required, traditional methods are cumbersome to operate, and repeated tightening can easily damage the sealing surface or fasteners.

[0003] To improve sealing performance, various improvement schemes have emerged in existing technologies. For example, using flexible O-rings or rubber gaskets to enhance adaptability, or adding additional sealant or spiral wound filler at flange connections. However, these methods still fail to fundamentally solve the problems of high installation alignment requirements and difficulty in effectively compensating for dynamic displacement of pipelines.

[0004] Therefore, in view of the problems of neutral sensitivity, insufficient adaptability and lack of reliable double sealing guarantee in the existing pipeline connection sealing technology, there is an urgent need for a connection device with reasonable structural design, convenient installation, effective adaptation to pipeline dynamic working conditions and multiple sealing capabilities. Utility Model Content

[0005] In order to overcome the shortcomings of existing pipeline connection sealing technology, such as sensitivity to installation accuracy, insufficient dynamic compensation capability, and lack of reliable multiple seals, this utility model provides a metal collar with a sealing structure.

[0006] The technical solution of this utility model is as follows: a metal collar with a sealing structure, comprising a flange, a metal collar, a top ring, an air bladder, an air valve, and a secondary sealing assembly. The flange consists of a base plate and a pipe body vertically fixed to the center of the base plate. The metal collar is slidably fitted onto the outside of the pipe body of the flange in a clearance fit manner. A top ring is installed on the outer side of the top of the metal collar. An annular assembly gap is reserved between the top surface of the metal collar and the bottom surface of the top ring. An air bladder is assembled in the annular assembly gap. A notch is opened on the top side wall of the metal collar. An air valve is fixedly connected to the outer side wall of the air bladder at the position corresponding to the notch. The air valve communicates with the inner cavity of the air bladder. A secondary sealing assembly is provided on the flange.

[0007] As a preferred embodiment of this invention, the airbag is made of fluororubber.

[0008] As a preferred technical solution of this utility model, the secondary sealing assembly includes a support ring and a sealing ring. The support ring is fixedly connected to the top of the flange, and the sealing ring is glued to the top surface of the support ring. An annular raised step is integrally formed on the upper part of the inner cavity wall of the metal collar. The position of the annular raised step is located directly above the sealing ring, forming a contact fit relationship.

[0009] As a preferred technical solution of this utility model, it also includes an L-shaped guide component. Four limiting grooves are spaced apart circumferentially on the outer side of the flange. The limiting grooves are L-shaped. Four L-shaped guide components are embedded and connected circumferentially on the outer side of the metal collar. The L-shaped guide components and the limiting grooves form a sliding fit relationship.

[0010] As a preferred technical solution of this utility model, the limiting groove on the flange is provided with through mounting holes in the section of the chassis, and the corresponding L-shaped guide is also provided with through mounting holes.

[0011] As a preferred technical solution of this utility model, it also includes a protective gasket, with the protective gasket glued to the bottom of the flange, and through holes of the same diameter opened on the protective gasket at positions corresponding to the mounting holes of the flange.

[0012] Beneficial effects: 1. The annular raised step and the support ring work together to compress the sealing ring, forming the first seal between the metal collar and the flange; the inflated air bladder fits tightly against the outer wall of the pipe, forming the second seal between the metal collar and the pipe. The two work together to significantly improve the sealing reliability of the pipe connection and effectively prevent gas or liquid leakage.

[0013] 2. By sliding the L-shaped guide and the limiting groove, the metal collar and flange are quickly circumferentially positioned, preventing misalignment during assembly. After the mounting holes are aligned, bolts can be inserted uniformly, which not only fixes the internal components but also completes the external installation, simplifying the assembly process and improving installation efficiency and accuracy.

[0014] 3. The airbag structure can expand elastically after inflation, adapting to pipes of different outer diameters within a certain range to achieve a tight fit. The sealing ring deforms and fills the gap after being compressed, further improving the fit of the sealing surface. Both have a certain deformation capacity, enhancing the device's adaptability to pipe size and installation deviations. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a three-dimensional structural diagram of the flange, protective gasket, and metal collar of this utility model.

[0017] Figure 3 This is a three-dimensional sectional view of the support ring, sealing ring, and airbag of this utility model.

[0018] Figure 4 This utility model Figure 1 Exploded view.

[0019] Figure 5 This utility model Figure 2 Exploded view.

[0020] The markings in the diagram are: 1-flange, 101-mounting hole, 102-limiting groove, 2-protective gasket, 3-metal collar, 301-L-shaped guide, 4-support ring, 5-sealing ring, 6-top ring, 7-air bladder, 8-air valve. Detailed Implementation

[0021] Example: A metal collar with a sealing structure, such as Figures 1-5 As shown, the assembly includes a flange 1, a metal collar 3, a top ring 6, an air bladder 7, an air valve 8, and a secondary sealing assembly. The flange 1 is an integrally molded structure, consisting of a base and a pipe body vertically fixed to the center of the base. The metal collar 3 is slidably fitted onto the outside of the pipe body of the flange 1 with a clearance fit. The top ring 6 is fixedly installed on the outer top of the metal collar 3 by circumferentially distributed bolts. An annular assembly gap is reserved between the top surface of the metal collar 3 and the bottom surface of the top ring 6. An annular air bladder 7 is assembled within this annular assembly gap. The air bladder 7 is made of fluororubber, which has good oil resistance, high temperature resistance, and aging resistance, and can significantly improve the performance of the air bladder 7 under complex chemical media and temperature conditions. To ensure service life and sealing reliability, a notch is provided on the top side wall of the metal collar 3. An air valve 8 is fixedly connected to the outer side wall of the airbag 7 at the corresponding position of the notch. The air valve 8 communicates with the inner cavity of the airbag 7 and is limited at the notch. Gas at a preset pressure is injected into the inner cavity of the airbag 7 through the air valve 8, causing the airbag 7 to expand. When the pipe to be connected is coaxially inserted into the inner cavity of the metal collar 3, the outer side wall of the expanded airbag 7 fits against the inner wall of the top ring 6, and the inner side wall abuts tightly against the outer wall of the pipe, forming the first sealing structure to ensure the sealing of the fluid transportation process. A secondary sealing component is provided on the flange 1, and a protective gasket 2 is glued to the bottom of the flange 1. The protective gasket 2 is made of elastic wear-resistant material.

[0022] like Figures 3-5As shown, the secondary sealing assembly includes a retainer ring 4 and a sealing ring 5. The retainer ring 4 is fixedly connected to the top of the flange 1, and the sealing ring 5 is glued to the top surface of the retainer ring 4. An annular raised step is integrally formed on the upper part of the inner wall of the metal collar 3. The position of the annular raised step is directly above the sealing ring 5. When the metal collar 3 slides down along the flange 1 to the assembly station, the bottom surface of the annular raised step of the metal collar 3 is in close contact with the top surface of the sealing ring 5, and forms axial pressure on the sealing ring 5, realizing the sealing connection between the metal collar 3 and the flange 1, thus forming the second sealing structure.

[0023] like Figures 1-5 As shown, it also includes a protective pad 2 and an L-shaped guide 301. Four limiting grooves 102 are spaced circumferentially on the outer side of the flange 1. The limiting grooves 102 are L-shaped. Four L-shaped guides 301 are embedded circumferentially on the outer side of the metal collar 3. The structure of the L-shaped guides 301 is adapted to the structure of the limiting grooves 102, forming a sliding fit. Through mounting holes 101 are provided on the limiting grooves 102 on the flange 1 in the section located on the chassis. Corresponding positions on the L-shaped guides 301... All flanges are also provided with through mounting holes 101. By inserting fastening bolts into the mounting holes 101, the axial fixation between the flange 1 and the metal collar 3 can be achieved, and the entire device can be fixedly connected to the flange face of the fluid equipment to be connected, ensuring the stability of the installation structure. The protective gasket 2 has through holes of the same diameter as the mounting holes 101 of the flange 1, ensuring that the bolt installation is not interfered with. At the same time, the protective gasket 2 can buffer the rigid impact during the installation of the device and avoid direct wear between the flange 1 and the equipment flange face.

[0024] When this device is put into use, the metal collar 3 is vertically aligned with the outer side of the pipe body of the flange 1, so that the L-shaped guide 301 is precisely aligned with the limiting groove 102 and slides along the groove. During this process, the annular raised step of the inner cavity of the metal collar 3 gradually approaches the sealing ring 5 on the top surface of the support ring 4. The circumferential limiting of the metal collar 3 is achieved through the sliding fit between the L-shaped guide 301 and the limiting groove 102. At this time, the annular raised step forms a preliminary compression on the sealing ring 5. The assembled whole device is then fitted to the flange surface of the fluid equipment, ensuring that the axis of the device is aligned with the equipment. With the pipe axis aligned, the mounting holes 101 on flange 1 and L-shaped guide 301 are aligned with the grooves on the equipment flange. Fastening bolts are inserted into each mounting hole 101 and pre-tightened in sequence. The axial tension of the bolts causes the annular raised step of the metal collar 3 to further press the sealing ring 5. Under the clamping action of the annular raised step and the support ring 4, the sealing ring 5 undergoes elastic deformation, completely filling the mating gap, achieving a seal between the metal collar 3 and flange 1, and constructing a second line of sealing defense. The bolts are then tightened to the preset torque to complete the fixed installation of the device and equipment.

[0025] Align the pipe to be connected coaxially with the inner cavity of the metal collar 3 and insert it along the axis to the preset depth, ensuring that the outer wall of the pipe and the inner wall of the metal collar 3 remain coaxial. Inflate the inner cavity of the air bladder 7 through the air valve 8. The air bladder 7 gradually expands, and its outer ring wall fits tightly against the inner wall of the top ring 6. The inner ring wall continues to expand towards the outer wall of the pipe until a stable elastic pressure contact is formed. The elastic deformation characteristics of the air bladder 7 achieve a seamless fit with the outer wall of the pipe, constructing the first line of defense between the device and the pipe. After inflation is complete, close the air valve 8. Through the synergistic effect of the secondary sealing component and the sealing structure of the air bladder 7, a double sealing protection is formed. The secondary sealing component ensures the basic seal between the metal collar 3 and the flange 1, while the sealing structure of the air bladder 7 achieves a flexible seal between the metal collar 3 and the pipe to be connected. The combination of the two effectively ensures the sealing performance when gas or liquid flows in the pipe, avoiding leakage problems.

Claims

1. A metal collar with a sealing structure, characterized in that: It includes a flange (1), a metal collar (3), a top ring (6), an air bladder (7), an air valve (8), and a secondary sealing assembly. The flange (1) consists of a base plate and a pipe body vertically fixed to the center of the base plate. The metal collar (3) is slidably fitted on the outside of the pipe body of the flange (1) with a clearance fit. A top ring (6) is installed on the top outside of the metal collar (3). An annular assembly gap is reserved between the top surface of the metal collar (3) and the bottom surface of the top ring (6). An air bladder (7) is assembled in the annular assembly gap. A notch is opened on the top side wall of the metal collar (3). An air valve (8) is fixedly connected to the outer side wall of the air bladder (7) at the position corresponding to the notch. The air valve (8) communicates with the inner cavity of the air bladder (7). A secondary sealing assembly is provided on the flange (1).

2. The metal collar with a sealing structure as described in claim 1, characterized in that: The airbag (7) is made of fluororubber.

3. A metal collar with a sealing structure as described in claim 2, characterized in that: The secondary sealing assembly includes a support ring (4) and a sealing ring (5). The support ring (4) is fixedly connected to the top of the flange (1), and the sealing ring (5) is glued to the top surface of the support ring (4). An annular raised step is integrally formed on the inner wall of the metal collar (3). The position of the annular raised step is located directly above the sealing ring (5), forming a contact fit relationship.

4. A metal collar with a sealing structure as described in claim 3, characterized in that: It also includes an L-shaped guide (301), and four limiting grooves (102) are provided on the outer side of the flange (1) along the circumferential direction. The limiting grooves (102) are L-shaped structures. Four L-shaped guides (301) are embedded and connected on the outer side of the metal collar (3) along the circumferential direction. The L-shaped guides (301) and the limiting grooves (102) form a sliding fit relationship.

5. A metal collar with a sealing structure as described in claim 4, characterized in that: The limiting groove (102) on the flange (1) is provided with through mounting holes (101) on the section of the chassis, and the corresponding L-shaped guide (301) is also provided with through mounting holes (101).

6. A metal collar with a sealing structure as described in claim 5, characterized in that: It also includes a protective pad (2), the bottom of the flange (1) is glued with a protective pad (2), and the protective pad (2) has a through hole of the same diameter at the position corresponding to the mounting hole (101) of the flange (1).

Images