A sealing and reinforcing device for connecting stainless steel pipes

Abstract

This utility model discloses a stainless steel pipe connection sealing and reinforcement device, relating to the field of pipeline connection technology. It includes two pipe bodies connected by flanges, with the flanges locked together by a plurality of arrayed hexagonal bolts and hexagonal nuts. A sealing and reinforcement component is provided on the flanges, with a plurality of symmetrically arrayed trapezoidal slots on the side walls at both ends of the component. The hexagonal bolts and hexagonal nuts are correspondingly engaged within these trapezoidal slots. The sealing and reinforcement component includes two semi-annular clamps, the upper ends of which are locked to the flanges by locking bolts. This utility model fundamentally solves the problem of bolt loosening caused by pipeline vibration and temperature changes, ensuring the long-term tightness of the flange connection, reducing the frequency of maintenance caused by bolt loosening, and lowering operation and maintenance costs.

Description

Technical Field

[0001] This utility model relates to the field of pipeline connection technology, specifically a stainless steel pipe connection sealing and reinforcement device. Background Technology

[0002] Stainless steel pipes are generally connected using flange connections, which involve aligning the flanges at the ends of the pipes and then tightening them using the threaded engagement of bolts and nuts. This is a mature and widely used basic connection method in the industry.

[0003] However, existing flange connection structures have gradually revealed multiple technical shortcomings during long-term use. On the one hand, pipeline operation is affected by factors such as internal fluid pressure fluctuations, external environmental vibrations (such as vehicle traffic and construction disturbances), and thermal expansion and contraction caused by temperature changes. These factors can easily cause circumferential loosening of the connecting bolts and nuts, leading to an increase in the flange fitting gap and the risk of fluid leakage. This not only wastes resources but may also damage the surrounding environment or facilities. On the other hand, the sealing performance of traditional flange connections mainly relies on the gasket between the flanges. However, the axial pressure of the bolts compresses the gasket. When the gasket fails due to aging, wear, or minor deformation of the flange, there is a lack of additional reinforcement structures to compensate for the compression of the gasket, making it difficult to maintain a stable sealing effect in the long term.

[0004] For example, a reinforcement structure for municipal pipeline connection disclosed in CN219198453U includes two pipeline bodies connected by flanges and a reinforcement component sleeved on the flanges for reinforcement. The reinforcement component includes two mutually hinged arc-shaped clamps, a positioning component disposed on the arc-shaped clamps and connected to the flanges, and a locking component disposed on the arc-shaped clamps for locking the two arc-shaped clamps.

[0005] The following shortcomings exist: Although this patent can achieve pipeline reinforcement, the structural design is relatively complex. For example, it relies on the linkage of multiple components such as screws, nuts, and sliders, making the installation process cumbersome. Furthermore, it has not been specifically optimized to address the issue of bolt loosening. There is an urgent need for a dedicated connection and reinforcement device with a simpler structure, more reliable sealing, and effective prevention of bolt loosening. Utility Model Content

[0006] The purpose of this invention is to provide a stainless steel pipe connection sealing and reinforcement device to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a stainless steel pipe connection sealing and reinforcement device, comprising two pipe bodies connected by flanges, wherein the flanges are locked together by a plurality of arrayed hexagonal bolts and hexagonal nuts, and a sealing and reinforcement component is provided on the flanges, wherein a plurality of arrayed trapezoidal slots are symmetrically arranged on the side walls at both ends of the sealing and reinforcement component, and the hexagonal bolts and hexagonal nuts are correspondingly engaged in the trapezoidal slots;

[0008] The sealing and reinforcement assembly includes two semi-circular clamps, the upper ends of which are locked to the flange by locking bolts.

[0009] Preferably, a sealing gasket is provided between the flanges. The sealing gasket enhances the sealing performance of the connection between the flanges.

[0010] Preferably, the trapezoidal notch is configured to match hexagonal bolts and hexagonal nuts.

[0011] Preferably, the semi-annular clamp is made of 304 stainless steel or 316L stainless steel, and its outer wall is also coated with an anti-corrosion coating, which is an epoxy resin coating or a polyvinyl fluoride coating.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. Enhanced sealing compensation: After the semi-circular clamp in the sealing reinforcement component is fastened, the upper locking bolt further applies radial clamping force, which can indirectly enhance the compression strength of the flange on the gasket. Even if the gasket is slightly aged or worn due to long-term use, the continuous clamping force of the clamp can compensate for the deformation of the gasket, avoid the sealing gap from expanding, and form a second layer of sealing protection. It is suitable for harsh working conditions such as high pressure and high corrosion.

[0014] 2. Anti-loosening bolt design significantly improves connection stability: The sealing and reinforcing components have trapezoidal slots on both ends that match the size of the hexagonal bolt head and hexagonal nut. When the semi-circular clamp is engaged, the bolt and nut can be precisely locked into the slots. The trapezoidal structure effectively restricts the circumferential rotation of the bolt and nut, fundamentally solving the problem of bolt loosening caused by pipeline vibration and temperature changes, ensuring the long-term tightness of the flange connection, reducing the frequency of maintenance caused by bolt loosening, and lowering operation and maintenance costs.

[0015] 3. Simple and reliable structure, strong installation and adaptability: The core components of the device only include simple structures such as semi-circular clamps, locking bolts, and trapezoidal bayonets. There is no need for complex multi-component linkage. During installation, you only need to complete the basic bolt connection of the flange first, then fasten the clamp and tighten the locking bolts. The operation process is simple, which can greatly shorten the construction time and reduce the technical requirements for the installers.

[0016] 4. Distribute stress load and extend the service life of the device: The semi-circular clamp after fastening forms a complete "reinforced shell", which can evenly distribute the forces such as internal pressure and external impact to the entire clamp structure, avoiding the concentration of force on a single bolt or flange, reducing the risk of bolt overload breakage and flange deformation; at the same time, the clamp's wrapping of the flange can also isolate external dust, water vapor and other corrosive media, slowing down the corrosion rate of the flange and bolts, significantly extending the service life of the entire connection device and reducing long-term operation and maintenance costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0019] Figure 3 This is a schematic diagram of the disassembled structure of this utility model. Figure 1

[0020] Figure 4 This is a schematic diagram of the disassembled structure of this utility model. Figure 2 .

[0021] In the diagram: 1. Pipe body; 11. Flange; 12. Sealing gasket; 2. Hex bolt; 21. Hex nut; 3. Sealing reinforcement assembly; 31. Semi-circular clamp; 32. Trapezoidal bayonet; 33. Locking bolt. Detailed Implementation

[0022] 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.

[0023] Please see Figure 1-4 This utility model provides a technical solution: a stainless steel pipe connection sealing and reinforcement device, including two pipe bodies 1 connected by flanges 11, the flanges 11 are locked together by a plurality of arrayed hexagonal bolts 2 and hexagonal nuts 21, a sealing and reinforcement component 3 is provided on the flanges 11, a plurality of arrayed trapezoidal slots 32 are symmetrically arranged on the side walls at both ends of the sealing and reinforcement component 3, and the hexagonal bolts 2 and hexagonal nuts 21 are correspondingly locked in the trapezoidal slots 32;

[0024] The sealing and reinforcement assembly 3 includes two semi-circular clamps 31, the upper ends of which are locked to the flange 11 by locking bolts 33.

[0025] Furthermore, a sealing gasket 12 is provided between the flanges 11. The sealing gasket 12 enhances the sealing performance of the connection between the flanges 11.

[0026] Furthermore, the trapezoidal bayonet 32 ​​is configured to match the hexagonal bolt 2 and the hexagonal nut 21.

[0027] Furthermore, the semi-circular clamp 31 is made of 304 stainless steel or 316L stainless steel, and its outer wall is also coated with an anti-corrosion coating, which is an epoxy resin coating or a polyvinyl fluoride coating.

[0028] Specifically, the core connection unit of the device consists of two stainless steel pipes 1 to be connected, each pipe 1 equipped with a flange 11 at one end, forming the basic structure for the connection. During installation, the flanges 11 of the two pipes 1 are first aligned so that the bolt holes on the flanges 11 correspond one-to-one. Then, multiple arrayed hexagonal bolts 2 are inserted, and hexagonal nuts 21 are screwed into the other end of the hexagonal bolts 2. The hexagonal nuts 21 are tightened with tools, and the axial pressure generated by the thread engagement between the hexagonal bolts 2 and the hexagonal nuts 21 initially locks the two flanges 11, realizing the basic connection of the pipes 1 and laying the structural foundation for subsequent sealing and reinforcement.

[0029] Then, a gasket 12 is placed between the two aligned flanges 11. The gasket is usually made of elastic and media-resistant materials such as rubber or graphite. When the hex bolts 2 and hex nuts 21 are tightened, the flanges 11 compress the gasket 12, causing it to deform elastically and fill the tiny gaps on the flange end face. This prevents the fluid (gas or liquid) in the pipe from leaking from the flange 11 connection, forming the first line of defense for sealing.

[0030] Secondly, the two semi-annular clamps 31 in the sealing reinforcement assembly 3, after the flange 11 is initially fixed, fasten from the outside of the flange 11 and wrap around the flange 11. The locking bolts 33 at the upper end of the semi-annular clamps 31 are further tightened, so that the clamps generate radial clamping force on the flange 11, which indirectly enhances the compression effect of the flange on the gasket 12, while reducing the deformation of the flange 11 caused by the internal pressure of the pipe or external vibration, avoiding the failure of the gasket seal, and forming a second layer of sealing protection.

[0031] Furthermore, the sealing and reinforcing component 3 has multiple arrayed trapezoidal slots 32 on its two end sidewalls, matching the dimensions of the hexagonal bolts 2 and hexagonal nuts 21. When the semi-circular clamp 31 is engaged, the head of the hexagonal bolt 2 and the hexagonal nut 21 are precisely engaged within the trapezoidal slots 32. The trapezoidal slots restrict the circumferential rotation of the hexagonal bolts 2 and hexagonal nuts 21, effectively preventing loosening of the hexagonal bolts 2 and hexagonal nuts 21 due to factors such as pipeline vibration and temperature changes, thus ensuring the tightness of the flange 11 connection.

[0032] The two semi-annular clamps 31, once engaged, form a complete annular structure that wraps around the flange 11 and the bolt connection area, effectively adding a "reinforced shell" to the flange 11 connection. This structure can disperse the localized force of the pipe pressure on the flange 11 and the hexagonal nut 21, reducing the load on the hexagonal nut 21 and preventing individual hexagonal nuts 21 from breaking due to overload. Simultaneously, it can resist the effects of external impacts and vibrations on the connection structure, preventing flange 11 misalignment or hexagonal nut 21 deformation, thus ensuring the structural stability and service life of the entire connection device.

[0033] 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 pipe connection sealing and reinforcement device, comprising two pipe bodies (1) connected by flanges (11), wherein the flanges (11) are locked together by a plurality of arrayed hexagonal bolts (2) and hexagonal nuts (21), characterized in that: The flange (11) is provided with a sealing and reinforcing component (3). Multiple trapezoidal slots (32) are symmetrically arranged on the side walls at both ends of the sealing and reinforcing component (3). The hexagonal bolts (2) and hexagonal nuts (21) are respectively locked in the trapezoidal slots (32). The sealing and reinforcement assembly (3) includes two semi-circular clamps (31), the upper ends of which are locked to the flange (11) by locking bolts (33).

2. The stainless steel pipe connection sealing and reinforcement device according to claim 1, characterized in that: A sealing gasket (12) is provided between the flanges (11) to enhance the sealing of the connection between the flanges (11).

3. The stainless steel pipe connection sealing and reinforcement device according to claim 1, characterized in that: The trapezoidal bayonet (32) is matched with the hexagonal bolt (2) and the hexagonal nut (21).

4. The stainless steel pipe connection sealing and reinforcement device according to claim 1, characterized in that: The semi-circular clamp (31) is made of 304 stainless steel or 316L stainless steel, and its outer wall is also coated with an anti-corrosion coating, which is an epoxy resin coating or a polyvinyl fluoride coating.

Images