A nitrogen sealing device for a pressure vessel nozzle

Abstract

This utility model discloses a nitrogen-filled sealing device for pressure vessel nozzles, belonging to the field of pressure vessel sealing technology. The device includes a fixing component located outside the nozzle and a sealing component that seals with the nozzle. The sealing component and the fixing component are detachably connected. A metal box with multiple drying holes is connected to the side of the sealing component inside the nozzle, and the metal box contains a desiccant. This utility model can absorb moisture that cannot be expelled after the nozzle is sealed, thereby alleviating internal corrosion caused by moisture.

Description

Technical Field

[0001] This utility model belongs to the field of pressure vessel sealing technology, specifically relating to a nitrogen-filled sealing device for pressure vessel pipe openings. Background Technology

[0002] To prevent pressure vessel equipment from corroding during transportation and storage, which could affect product performance, pressure vessel equipment used in nuclear power, solar energy, and chemical industries generally requires mechanical nitrogen purging and sealing during storage and transportation, and the maintenance of a low-pressure gas environment.

[0003] Existing sealing structure technologies mainly utilize the friction between the flexible sealing ring and the pipe wall or the contact friction between the sealing gasket and the pipe end to achieve sealing. For example, a nitrogen-filled sealing device for a voltage regulator pulsating pipe with patent number CN202987816U. While these structures achieve sealing, they also bring new problems. After water pressure, the water vapor inside the equipment is not fully removed. Due to long transportation and storage times, water vapor cannot be removed after the pipe opening is sealed, resulting in corrosion inside the pipe opening. Utility Model Content

[0004] To address the problem of internal corrosion caused by the inability to release moisture after the pressure vessel nozzle is sealed, this invention provides a nitrogen-filled sealing device for pressure vessel nozzles.

[0005] The embodiments of this utility model are achieved through the following technical solutions: This embodiment provides a nitrogen-filled sealing device for a pressure vessel port, including a fixing component located on the outside of the port and a sealing component that can seal with the port. The sealing component and the fixing component are detachably connected. A metal box with multiple drying holes is connected to one side of the sealing component inside the port, and a desiccant is provided inside the metal box.

[0006] This design effectively ensures that the gas inside the equipment is dry, thus preventing moisture that cannot be expelled after the pipe is sealed from corroding the inside of the pipe.

[0007] In some technical solutions of this utility model, the above-mentioned fixing component includes a clamp sleeved on the outside of the above-mentioned pipe opening, and a rubber pad is provided between the clamp and the outer wall of the pipe opening.

[0008] This design can improve the stability of the clamp fixation to a certain extent.

[0009] In some technical solutions of this utility model, the sealing assembly includes an end plate placed at the end of the pipe opening, and the fixing assembly includes at least four first round steels arranged at equal intervals welded to the outside of the clamp. The end of the first round steel away from the clamp passes through the end plate and is threaded, and is threadedly connected to the first nut.

[0010] In this design, the distance between the clamp and the pipe opening is adjusted by changing the length of the first round steel bar. Personnel can make corresponding adjustments according to the thickness of the pipe opening. The thicker the pipe opening, the more first round steel bars are needed. At the same time, the length of the first round steel bar can be increased appropriately.

[0011] In some technical solutions of this utility model, the sealing assembly includes a pipe seat with an O-ring connected to the inner end of the pipe. At least four second round steel bars are welded radially to the inner wall of the pipe seat, and their axes are parallel to the axis of the pipe end. A pressure ring is slidably sleeved on the outer side of the pipe seat. The second round steel bars pass through the end plate and are connected to a second nut that can apply a preload to the O-ring through the end plate and the pressure ring.

[0012] This design makes installation convenient.

[0013] In some technical solutions of this utility model, the above-mentioned pipe seat includes a pipe fitting with an O-ring and a circular plate sealed and welded inside the pipe fitting, and the above-mentioned second round steel is welded to the inner wall of the pipe fitting near the pipe opening.

[0014] The pipe seat consists of hollow pipe fittings and circular plates, rather than a solid cylindrical structure. This significantly reduces the weight of the sealing device while ensuring performance requirements, making the sealing device lighter and avoiding the problem of loosening due to excessive weight affecting the sealing effect in large-diameter pipes.

[0015] In some technical solutions of this utility model, the number of O-rings is at least two, and a sealing groove is opened on the outside of the pipe fitting for placing multiple O-rings arranged sequentially along the axial direction of the pipe fitting. The pressure ring is slidably disposed in the sealing groove and is located between the O-ring and the end plate.

[0016] Having two O-rings can further enhance the sealing effect.

[0017] In some technical solutions of this utility model, the sealing groove and the pipe are rounded.

[0018] This design allows for a closer fit between the O-ring and the socket, facilitating O-ring deformation.

[0019] In some technical solutions of this utility model, a sealing gasket is provided between the end plate and the pipe opening. The sealing gasket is located above the pressure ring and is used to seal the gap between the pipe seat and the pipe opening.

[0020] This design not only protects the pipe end bevel from damage, but also forms a double seal, further enhancing the sealing performance.

[0021] In some technical solutions of this utility model, the end plate includes a circular plate and a plurality of equally spaced unit plates connected to the circular plate with rounded corners. The number of unit plates is consistent with the number of the first round steel and corresponds one-to-one. The second round steel passes through the circular plate.

[0022] This design achieves the purpose of fixing and ensures performance while reducing the weight of the mechanism. It avoids the problem that the static friction between the fixing mechanism and the pipe opening is insufficient to overcome the weight of the sealing device when the sealing device is too heavy in the case of large pipe diameter, which would cause the seal to loosen and affect the sealing effect.

[0023] The technical solution of this utility model has at least the following advantages and beneficial effects: This utility model is equipped with a sealing component and a fixing component. A metal box with multiple drying holes is set in the sealing device, which can absorb water vapor that cannot be discharged after the pipe opening is sealed to a certain extent, thereby alleviating the internal corrosion of the pipe opening caused by water vapor. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a nitrogen-filled sealing device for a pressure vessel nozzle according to the present invention; Figure 2 This is one of the partial structural schematic diagrams of a nitrogen-filled sealing device for a pressure vessel nozzle according to this utility model; Figure 3 This is a partial structural diagram of the clamp in a nitrogen-filling sealing device for a pressure vessel nozzle according to the present invention. Figure 4 This is the second partial structural schematic diagram of a nitrogen-filled sealing device for a pressure vessel nozzle according to this utility model; Figure 5 This is a top view of the end plate of a nitrogen filling and sealing device for a pressure vessel nozzle according to the present invention. Figure 6 This is a schematic diagram of the metal box in a nitrogen-filled sealing device for a pressure vessel nozzle according to the present invention.

[0025] Icons: 1-Metal box, 2-Drying hole, 3-Clamping ring, 4-Rubber pad, 5-End plate, 6-First round steel bar, 7-First nut, 8-Sealing gasket, 9-Pipe seat, 10-Second round steel bar, 11-Second nut, 12-Pipe fitting, 13-Round plate, 14-O-ring, 15-Sealing groove, 16-Pressure ring, 17-Rounded corner, 18-Pipe opening, 19-Round plate, 20-Unit plate. Detailed Implementation

[0026] Example: Please refer to Figure 1-6 This embodiment provides a nitrogen filling and sealing device for a pressure vessel port 18, including a fixing component disposed on the outside of the port 18 and a sealing component that can seal with the port 18. The sealing component and the fixing component are detachably connected. A metal box 1 with multiple drying holes 2 is connected to one side of the sealing component inside the port 18. A desiccant is disposed inside the metal box 1.

[0027] The sealing device operates on the following principle: It also includes a connecting pipe, which is a metal tube positioned between the sealing component and the metal box 1. The metal box 1 contains a desiccant, typically color-changing silica gel, usually in granular form. Common sizes include 1-3mm, 2-4mm, 3-5mm, and 4-8mm. Users can select the appropriate size based on their specific needs. Color-changing silica gel is primarily composed of silicon dioxide (SiO2), exhibiting relatively stable chemical properties and high adsorption capacity. Its porous structure allows for rapid adsorption of moisture from the environment, gradually changing color to pink or green after absorbing water (the specific color varies depending on the formulation). This color change provides users with intuitive feedback on the moisture absorption status, facilitating timely replacement of expired desiccant. The optimal moisture absorption environment is room temperature (20–32℃) and high temperature (60–90℃), while nitrogen purging protection of pressure vessels is usually carried out at room temperature or slightly above room temperature; therefore, its temperature adaptability fully meets the requirements. Furthermore, expired silica gel can be regenerated by heating and drying (e.g., drying at 105℃ for 5 hours) for reuse, reducing operating costs and environmental impact. The metal box 1 is formed by six metal unit plates 20. Each metal unit plate 20 has multiple drying holes 2. It should be noted that the diameter of the drying holes 2 needs to be larger than the diameter of the desiccant to prevent the desiccant from flowing out of the metal box 1.

[0028] First, five metal unit plates 20 are welded together to form the body of the metal box 1. Then, a desiccant is filled into the metal box 1. The last metal unit plate 20 is then fastened to the body of the metal box 1 and sealed with spot welding. The metal box 1 is then connected to a connecting pipe and a sealing assembly. After preparation, the sealing assembly with the metal box 1 is placed into the pipe opening 18 of the pressure vessel, and the fixing assembly is installed accordingly. The fixing assembly and the sealing assembly are then connected, and the sealing assembly begins to seal the pipe opening 18. This design effectively ensures the dryness of the gas inside the equipment, preventing moisture trapped inside the sealed pipe opening 18 from corroding the inside.

[0029] In a preferred embodiment, the aforementioned fixing component includes a clamp 3 fitted onto the outside of the aforementioned pipe opening 18, and a rubber pad 4 is provided between the clamp 3 and the outer wall of the pipe opening 18.

[0030] In the above embodiments, such as Figure 2-3 As shown, the clamp 3 is tightened and fixed by fastening bolts and corresponding fastening nuts; the clamp 3 is placed on the outside of the pipe opening 18, and a rubber pad 4 is provided between the two as a partition to increase the friction force, which can improve the firmness of the clamp 3 to a certain extent.

[0031] In a preferred embodiment, the sealing assembly includes an end plate 5 placed at the end of the pipe opening 18, and the fixing assembly includes at least four first round steel bars 6 arranged at equal intervals and welded to the outside of the clamp 3. The end of the first round steel bar 6 away from the clamp 3 passes through the end plate 5 and is threaded, and is threadedly connected to the first nut 7.

[0032] In the above embodiment, a first washer is also included, which is inserted through the first round steel 6. The first washer is provided between the first nut 7 and the end plate 5. One end of the first nut 7 is provided with a threaded section for threaded connection with the first round steel 6, and the other end is welded to the outside of the clamp 3. In this design, the position of the clamp 3 from the pipe opening 18 is achieved by adjusting the length of the first round steel 6. Personnel can make corresponding adjustments according to the thickness of the pipe opening 18. The thicker the pipe opening 18, the more first round steel 6 are required. At the same time, the length of the first round steel 6 can be appropriately increased.

[0033] In a preferred embodiment, the sealing assembly includes a pipe seat 9 with an O-ring 14 connected to the inner end of the pipe port 18. At least four equally spaced second round steel bars 10 are welded to the inner wall of the pipe seat 9 along its radial direction, and their axes are parallel to the axis of the pipe port 18. A pressure ring 16 is slidably sleeved on the outer side of the pipe seat 9. The second round steel bars 10 pass through the end plate 5 and are connected to a second nut 11 that can apply a preload to the O-ring 14 through the end plate 5 and the pressure ring 16.

[0034] In the above embodiment, a second gasket is also included. During installation, the pipe seat 9 with the O-ring 14 is first placed inside the pipe opening 18, and then the end plate 5 is placed over the pipe opening 18. Simultaneously, four second round steel bars 10 and four first round steel bars 6 pass through the end plate 5. The first gasket and the first nut 7 pass through the corresponding first round steel bars 6 in sequence, and the first nut 7 begins to tighten. The installation of the fixing and sealing components is complete. The second gasket and the second nut 11 pass through the corresponding second round steel bars 10 in sequence, and the second nut 11 begins to tighten. The second nut 11 applies a preload to the end plate 5, which transmits the preload to the pressure ring 16. The pressure ring 16 slides and transmits the preload to the O-ring 14, causing the elastic O-ring 14 to deform, thereby generating pressure on the inner wall of the pipe opening 18 to achieve a seal. This design method is convenient to install.

[0035] In a preferred embodiment, the aforementioned pipe seat 9 includes a pipe fitting 12 with an O-ring 14 and a circular plate 13 sealed and welded inside the pipe fitting 12, wherein the aforementioned second round steel 10 is welded to the inner wall of the pipe fitting 12 near the pipe opening 18.

[0036] In the above embodiment, the pipe seat 9 is composed of a hollow pipe 12 and a circular plate 13, rather than a solid column structure. This can significantly reduce the weight of the sealing device while ensuring the performance requirements, making the sealing device lighter and avoiding the problem of loosening of the seal due to excessive weight of the sealing device in the case of large pipe diameter.

[0037] In a preferred embodiment, the number of O-rings 14 is at least two. A sealing groove 15 is provided on the outside of the pipe fitting 12 for placing multiple O-rings 14 arranged sequentially along the axial direction of the pipe fitting 12. The pressure ring 16 is slidably disposed in the sealing groove 15 and is located between the O-rings 14 and the end plate 5.

[0038] In the above embodiment, having two O-rings 14 can further enhance the sealing effect.

[0039] In a preferred embodiment, the sealing groove 15 and the pipe fitting 12 are rounded at the corner 17.

[0040] In the above embodiments, this design allows the O-ring 14 to fit more closely with the tube seat 9, facilitating the deformation of the O-ring 14.

[0041] In a preferred embodiment, a sealing gasket 8 is provided between the end plate 5 and the pipe opening 18. The sealing gasket 8 is located above the pressure ring 16 and is used to seal the gap between the pipe seat 9 and the pipe opening 18.

[0042] In the above embodiment, this design can protect the pipe end bevel of the pipe port 18 from damage and form a double seal to further enhance the sealing performance.

[0043] In a preferred embodiment, the end plate 5 includes a circular plate 19 and a plurality of equally spaced unit plates 20 connected to the rounded corners 17 of the circular plate 19. The number of unit plates 20 is consistent with the number of the first round steel 6 and corresponds one-to-one. The second round steel 10 passes through the circular plate 19.

[0044] In the above embodiment, the first round steel 6 is inserted into the corresponding unit plate 20; this design can achieve the purpose of fixing and ensure the performance of use, while reducing the weight of the mechanism. It avoids the problem that the static friction between the fixing mechanism and the above-mentioned pipe opening 18 is insufficient to overcome the weight of the sealing device due to the excessive weight of the sealing device in the case of large pipe diameter, which causes the seal to loosen easily and affect the sealing effect.

[0045] In summary, the embodiments of this utility model provide a nitrogen-filled sealing device for the pressure vessel port 18. This utility model has multiple seals, which effectively ensures the airtightness of the equipment and avoids the impact of unpredictable water vapor inside the equipment on the equipment protection, thus having high reliability.

Claims

1. A nitrogen-filled sealing device for a pressure vessel port (18), comprising a fixing component disposed outside the port (18) and a sealing component capable of sealingly engaging with the port (18), wherein the sealing component and the fixing component are detachably connected, characterized in that, The sealing assembly is connected to a metal box (1) with multiple drying holes (2) on one side inside the pipe opening (18), and the metal box (1) contains a desiccant.

2. A pressurised container nozzle (18) nitrogen charging sealing device according to claim 1 characterised in that, The fixing component includes a clamp (3) sleeved on the outside of the pipe opening (18), and a rubber pad (4) is provided between the clamp (3) and the outer wall of the pipe opening (18).

3. The nitrogen-filled sealing device for the pressure vessel port (18) according to claim 2, characterized in that, The sealing assembly includes an end plate (5) placed at the end of the pipe opening (18), and the fixing assembly includes at least four first round steels (6) arranged at equal intervals welded to the outside of the clamp (3). The end of the first round steel (6) away from the clamp (3) passes through the end plate (5) and is threaded, and is threadedly connected to the first nut (7).

4. The nitrogen-filled sealing device for the pressure vessel port (18) according to claim 3, characterized in that, The sealing assembly includes a pipe seat (9) with an O-ring (14) connected to the inner end of the pipe (18). At least four second round steel bars (10) are welded radially to the inner wall of the pipe seat (9) and are arranged at equal intervals with their axes parallel to the axis of the pipe (18). A pressure ring (16) is slidably sleeved on the outer side of the pipe seat (9). The second round steel bars (10) pass through the end plate (5) and are connected to a second nut (11) that can apply a preload to the O-ring (14) through the end plate (5) and the pressure ring (16).

5. The nitrogen-filled sealing device for the pressure vessel port (18) according to claim 4, characterized in that, The pipe seat (9) includes a pipe fitting (12) with an O-ring (14) and a circular plate (13) sealed and welded inside the pipe fitting (12), wherein the second round steel (10) is welded to the inner wall of the pipe fitting (12) near the pipe opening (18).

6. The nitrogen-filled sealing device for the pressure vessel port (18) according to claim 5, characterized in that, The number of O-rings (14) is at least two. A sealing groove (15) is opened on the outside of the fitting (12) for placing multiple O-rings (14) arranged sequentially along the axial direction of the fitting (12). The pressure ring (16) is slidably disposed in the sealing groove (15) and located between the O-rings (14) and the end plate (5).

7. A pressurised container nozzle (18) nitrogen filling seal as claimed in claim 6, characterised in that, The sealing groove (15) and the pipe fitting (12) are rounded (17).

8. The nitrogen-filled sealing device for the pressure vessel port (18) according to claim 6, characterized in that, A sealing gasket (8) is provided between the end plate (5) and the pipe opening (18). The sealing gasket (8) is located above the pressure ring (16) and is used to seal the gap between the pipe seat (9) and the pipe opening (18).

9. The pressurized container nozzle (18) nitrogen purging sealing device of claim 4, wherein, The end plate (5) includes a circular plate (19) and multiple unit plates (20) arranged at equal intervals connected to the rounded corners (17) of the circular plate (19). The number of unit plates (20) is consistent with the number of the first round steel (6) and corresponds one-to-one. The second round steel (10) is located on the circular plate (19).

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