Regulator tube port seal

Abstract

The utility model relates to the technical field of pipe orifice sealing, disclose a kind of stabiliser pipe orifice sealing device. The sealing device, including with the pipe orifice inside connection with the sealing assembly of first sealing ring, sealing assembly includes two for installing the positioning member of first sealing ring, sealing assembly further includes along the radial equidistance arrangement of pipe orifice, and its axis is parallel with the positioning rod of pipe orifice axis, positioning rod is worn in above-mentioned sealing assembly, and its pipe orifice outside side screw thread connection has tightening nut, one of positioning member in the side of tightening nut slides along the axial direction of pipe orifice and exerts pressure on first sealing ring, pipe fitting is connected with the inner wall of pipe orifice in the inside of sealing assembly in pipe orifice, and one end of positioning rod placed in pipe fitting is fixedly connected to above-mentioned pipe fitting. The utility model is fixed with the sealing assembly by setting pipe fitting in the inside of pipe orifice, because fixed structure is the pipe fitting set in the inside of pipe orifice, each orientation of pipe orifice is suitable, reduce the influence of sealing device pipe orifice orientation on sealing performance, it is more convenient to operate.

Description

Technical Field

[0001] This utility model belongs to the field of pipe sealing technology, specifically relating to a pipe sealing device for a voltage regulator. Background Technology

[0002] The nuclear island pressurizer is a crucial piece of equipment in a nuclear power plant, controlling pressure changes in the reactor system and playing a vital role in the safe operation of the plant. Accordingly, the equipment requires high levels of protection during storage and transportation. It must be internally purged with nitrogen and sealed to maintain a low-pressure state for protection. Because welded end caps cannot be installed on the pressurizer's ports, a non-welded mechanical sealing structure is necessary to meet the equipment's airtightness requirements.

[0003] Existing nitrogen-filled mechanical seal technology for pipe fittings, such as the radial sealing device and sealing method for steel pipe fittings (patent number CN109973749A), consists of a sealing gland, a sealing plate, and a rubber ring. The rubber ring is fitted over the small-end annular protrusion of the sealing plate. By tightening the sealing gland and sealing plate, the rubber ring is compressed, causing it to elastically deform and adhere tightly to the sealing surface to form a seal. However, this design has significant requirements regarding the pipe fitting orientation. If the pipe fitting is facing downwards during installation, it will pose certain difficulties for installation, and the sealing effect after installation is also greatly affected by the pipe fitting orientation. The working conditions during transportation and storage are complex, and fasteners and sealing materials are easily subjected to vibration. If the pipe fitting is facing downwards, the sealing device may loosen or even fall off. Utility Model Content

[0004] To address the issues of poor sealing performance and inconvenient installation caused by the orientation of the pipe opening, this utility model provides a pipe opening sealing device for a voltage regulator.

[0005] This utility model is achieved through the following technical solution: A voltage regulator port sealing device includes a sealing assembly with a first sealing ring connected to the port. The sealing assembly includes two positioning members for installing the first sealing ring. The sealing assembly also includes at least three positioning rods arranged at equal intervals along the radial direction of the port, with their axes parallel to the axis of the port. The positioning rods pass through the sealing assembly, and a tightening nut is threaded to the outside of the port. One of the positioning members on the tightening nut side slides along the axial direction of the port to apply pressure to the first sealing ring. A pipe fitting connected to the inner wall of the port is provided inside the sealing assembly inside the port. One end of the positioning rod placed inside the pipe fitting is fixedly connected to the pipe fitting.

[0006] In this design, the sealing assembly is fixed as a whole by means of a fitting set on the inner wall of the pipe opening. Compared with the existing sealing devices that rely on the end of the pipe opening for fixing, this method is more convenient, reduces the difficulty of installation, and can be applied to sealing pipe openings in various orientations.

[0007] In some technical solutions of this utility model, the positioning rod is provided with an abutment ring in the middle that abuts against the sealing component, and a second sealing ring is provided between the abutment ring and the sealing component.

[0008] This design approach can improve the sealing performance of the sealing component to some extent.

[0009] In some technical solutions of this utility model, the two positioning components are a pressure plate and an end plate, and the sealing assembly includes a pressure plate, a first sealing ring and an end plate that are sequentially fitted onto the positioning rod from the outside of the pipe opening to the inside of the pipe opening. The second sealing ring is located on the side of the end plate away from the pressure plate, and the side of the pressure plate near the end plate is provided with a convex annular abutment that can apply pressure to the first sealing ring by tightening the nut.

[0010] This design method is simple in structure and easy to operate.

[0011] In some technical solutions of this utility model, the end plate is provided with a sealing groove, the first sealing ring is placed in the sealing groove, the inner side of the sealing groove is provided with a rounded corner that can fit with the first sealing ring, and the convex annular abutment plate slides in cooperation with the sealing groove.

[0012] The rounded corners on the sealing groove can improve the fit between the first sealing ring and the end plate to some extent.

[0013] In some technical solutions of this utility model, the number of the first sealing rings is two, and the two first sealing rings are attached to each other in the sealing groove along the axial direction of the end plate.

[0014] The use of two first sealing rings can improve the sealing quality to a certain extent. If one of the first sealing rings is damaged, the other can still ensure the radial sealing of the sealing device.

[0015] In some technical solutions of this utility model, the pressure plate has a circular weight-reducing hole, and the axis of the circular weight-reducing hole is collinear with the axis of the pressure plate.

[0016] The circular weight-reduction holes allow for a reduction in the original thickness of the pressure plate, significantly reducing its overall weight while ensuring its performance requirements to a certain extent.

[0017] In some technical solutions of this utility model, the end plate is provided with a plurality of fan-shaped weight reduction grooves on the side near the pressure plate, and the plurality of fan-shaped weight reduction grooves are arranged at equal intervals along the circumferential direction of the end plate axis.

[0018] The fan-shaped weight-reducing groove can reduce the overall weight of the sealing assembly by reducing the weight of the pressure plate, thereby solving the problem of excessive weight of the current sealing device.

[0019] In some technical solutions of this utility model, the above-mentioned pipe fitting is detachably connected to the pipe wall by at least four radial bolts, and one end of the positioning rod placed inside the pipe opening is welded to the inner wall of the above-mentioned pipe fitting. No interference is allowed between any radial bolt and any positioning rod.

[0020] The pipe fitting has a threaded hole that mates with the radial bolt thread.

[0021] In some technical solutions of this utility model, the end of the shank of the radial bolt is a smooth cylinder, which can be inserted into the inner wall hole of the pipe opening.

[0022] This design can, to some extent, prevent radial threads from damaging the borehole surface.

[0023] The technical solution of this utility model has at least the following advantages and beneficial effects: The sealing device of this utility model includes a first sealing ring, two positioning parts, multiple positioning rods and a locking nut, and a pipe fitting is set inside the pipe opening to complete the fixing of the sealing assembly. Since the fixing structure is a pipe fitting set inside the pipe opening, the sealing device is suitable for the sealing needs of pipe openings in various orientations, reduces the influence of the pipe opening orientation on the sealing performance, and improves the convenience and economy of installation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a voltage regulator port sealing device according to the present invention; Figure 2 This is a partial structural schematic diagram of a voltage regulator port sealing device according to the present invention; Figure 3 This is a top view of the end plate of a voltage regulator port sealing device according to the present invention.

[0025] Icons: 1-Sealing assembly, 2-Positioning rod, 3-Tightening nut, 4-Abutment ring, 5-Second sealing ring, 6-Pressure plate, 7-End plate, 8-First sealing ring, 9-Convex annular abutment plate, 10-Sealing groove, 11-Rounded corner, 12-Circular weight reduction hole, 13-Fan-shaped weight reduction groove, 14-Pipe fitting, 15-Radial bolt, 16-Smooth cylinder, 17-Inner wall hole, 18-Pipe opening. Detailed Implementation

[0026] Example: Please refer to Figures 1-3This embodiment provides a sealing device for a voltage regulator port 18, including a sealing assembly 1 with a first sealing ring 8 connected to the port 18. The sealing assembly 1 includes two positioning members for installing the first sealing ring 8. The sealing assembly 1 also includes at least three positioning rods 2 arranged at equal intervals along the radial direction of the port 18 and whose axes are parallel to the axis of the port 18. The positioning rods 2 pass through the sealing assembly 1 and are threadedly connected to a tightening nut 3 on the outside of the port 18. One of the positioning members on the side of the tightening nut 3 slides along the axial direction of the port 18 to apply pressure to the first sealing ring 8. Inside the port 18, on the inner side of the sealing assembly 1, there is a pipe fitting 14 connected to the inner wall of the port 18. One end of the positioning rod 2 placed inside the pipe fitting 14 is fixedly connected to the pipe fitting 14.

[0027] The sealing device operates as follows: Washers are fitted onto the positioning rods 2, with the number of washers matching the number of positioning rods 2. Each washer is located between a positioning element and a tightening nut 3. The positioning element is the one of two positioning elements that engages with the tightening nut 3. The positioning rods 2 pass through both positioning elements. The number of positioning rods 2 can be determined based on the inner diameter of the pipe opening 18; the larger the inner diameter of the pipe opening 18, the more positioning rods 2 are required.

[0028] First, the fitting 14 is installed on the pipe opening 18 that needs to be sealed, thus fixing the positions of the multiple positioning rods 2. Then, a first sealing ring 8 and two positioning members for installing the first sealing ring 8 are placed into the pipe opening 18. At the same time, they need to be fitted onto the multiple positioning rods 2. Then, the corresponding first washers and tightening nuts 3 are sequentially fitted onto the corresponding positioning rods 2. Then, the tightening nuts 3 are tightened. The tightening nuts 3 move closer to the positioning members, and the sliding positioning members are subjected to pressure and begin to slide, applying pressure to the first sealing ring 8, causing the first sealing ring 8 to deform under pressure, thus sealing the pipe opening 18.

[0029] In this design, the sealing component 1 is fixed as a whole by means of the fitting 14 set on the inner wall of the pipe opening 18. Compared with the existing technology, which relies on the end of the pipe opening 18 for fixing, this method is more convenient and the installation difficulty is reduced. It can be applied to sealing pipe openings 18 in various orientations.

[0030] In a preferred embodiment, the positioning rod 2 is provided with an abutment ring 4 in the middle that abuts against the sealing assembly 1, and a second sealing ring 5 is provided between the abutment ring 4 and the sealing assembly 1.

[0031] In the above embodiment, when the tightening nut 3 begins, it moves closer to the positioning member. The sliding positioning member is under pressure and begins to slide. At the same time, the positioning member and the abutment ring 4 begin to be squeezed, and the second sealing ring 5 deforms, creating a seal on the positioning member to prevent airtightness at the connection of the positioning rod 2, thus achieving a secondary seal. This design can improve the sealing performance of the sealing assembly 1 to a certain extent.

[0032] In a preferred embodiment, the two positioning components are a pressure plate 6 and an end plate 7. The sealing assembly 1 includes a pressure plate 6, a first sealing ring 8, and an end plate 7 that are sequentially fitted onto the positioning rod 2 from the outside of the pipe opening 18 to the inside of the pipe opening 18. The second sealing ring 5 is located on the side of the end plate 7 away from the pressure plate 6. The side of the pressure plate 6 near the end plate 7 is provided with a convex annular abutment 9 that can apply pressure to the first sealing ring 8 by tightening the nut 3.

[0033] In the above embodiment, the pressure plate 6 with the convex annular abutment 9, the first sealing ring 8 and the end plate 7 are connected in sequence. After the tightening nut 3 starts to tighten, the convex annular abutment 9 slides to squeeze the first sealing ring 8. This design is simple in structure and easy to operate.

[0034] In a preferred embodiment, the end plate 7 is provided with a sealing groove 10, the first sealing ring 8 is placed in the sealing groove 10, the inner side of the sealing groove 10 is provided with a rounded corner 11 that can fit with the first sealing ring 8, and the convex annular abutment 9 is slidably engaged with the sealing groove 10.

[0035] In the above embodiment, the rounded corner 11 on the sealing groove 10 can improve the fit between the first sealing ring 8 and the end plate 7 to a certain extent.

[0036] In a preferred embodiment, there are two first sealing rings 8, which are arranged in a axial manner along the end plate 7 within the sealing groove 10.

[0037] In the above embodiment, the arrangement of two first sealing rings 8 can improve the sealing quality to a certain extent. If one of the first sealing rings 8 is damaged, the other can still ensure the radial sealing of the sealing device.

[0038] In a preferred embodiment, the pressure plate 6 has a circular weight-reducing hole 12, and the axis of the circular weight-reducing hole 12 is collinear with the axis of the pressure plate 6.

[0039] In the above embodiments, the circular weight-reducing hole 12 can reduce the original thickness of the pressure plate 6, and significantly reduce its overall weight while ensuring the performance requirements of the pressure plate 6 to a certain extent.

[0040] As a preferred embodiment, the end plate 7 is provided with a plurality of fan-shaped weight reduction grooves 13 on the side near the pressure plate 6, and the plurality of fan-shaped weight reduction grooves 13 are arranged at equal intervals along the circumferential direction of the axis of the end plate 7.

[0041] In the above embodiments, the fan-shaped weight reduction groove 13 can reduce the overall weight of the sealing assembly 1 by reducing the weight of the pressure plate 6, thereby changing the problem of excessive self-weight of the current sealing device.

[0042] In a preferred embodiment, the aforementioned pipe fitting 14 is detachably connected to the pipe wall by at least four radial bolts 15, and one end of the aforementioned positioning rod 2 placed inside the pipe opening 18 is welded to the inner wall of the aforementioned pipe fitting 14. No interference is caused between any radial bolt 15 and any positioning rod 2.

[0043] In the above embodiment, the pipe fitting 14 has a threaded hole that mates with the radial bolt 15; the requirements for welding the weld can be adjusted according to the size and weight of the sealing device. The larger the sealing device and the greater its weight, the larger the corresponding weld.

[0044] In a preferred embodiment, the end of the shank of the radial bolt 15 is a smooth cylinder 16, which can be inserted into the inner wall hole 17 of the pipe opening 18.

[0045] In this embodiment, the radial bolt 15 passes through the threaded hole on the pipe fitting 14 and is inserted into the hole on the inner wall of the pipe opening 18. It should be noted that the nominal diameter of the radial bolt 15 must be smaller than the inner diameter of the pipe opening 18, and the tail is provided with a rounded corner. This design can, to a certain extent, avoid damage to the surface of the hole wall of the pipe opening 18 caused by the radial thread.

[0046] In summary, this utility model provides a sealing device for a pressurizer port 18, and a novel nitrogen-filled sealing structure for a nuclear power pressurizer port 18. A pipe fitting 14 is installed inside the port 18 to fix the sealing component 1. While using a first sealing ring 8 as the basic seal, a second sealing ring 5 is introduced for secondary sealing. This internal double-layer sealing method avoids the influence of humidity and temperature on the sealing material, ensuring the sealing effect and strengthening the stability of the sealing device at the end of the port 18. Because the fixing structure is a pipe fitting 14 installed inside the port 18, it is applicable to all orientations of the port 18, making operation more convenient. The sealing structure has been designed to reduce weight, lowering the self-weight of the sealing device and reducing the impact of the port 18's orientation on sealing performance, thus improving economic efficiency.

Claims

1. A voltage regulator port sealing device, comprising a sealing assembly (1) having a first sealing ring (8) connected to the port, the sealing assembly (1) comprising two positioning members for installing the first sealing ring (8), the sealing assembly further comprising at least three positioning rods (2) arranged at equal intervals along the radial direction of the port and whose axes are parallel to the axis of the port, the positioning rods (2) passing through the sealing assembly (1), and having a tightening nut (3) threadedly connected to the outer side of the port, one of the positioning members on the side of the tightening nut (3) sliding along the axial direction of the port to apply pressure to the first sealing ring (8), characterized in that, A pipe fitting (14) is provided inside the sealing assembly (1) and connected to the inner wall of the pipe opening (18). One end of the positioning rod (2) is fixedly connected to the pipe fitting (14) inside the pipe fitting.

2. The voltage regulator port sealing device according to claim 1, characterized in that, The positioning rod (2) has an abutment ring (4) in the middle that abuts against the sealing assembly (1), and a second sealing ring (5) is provided between the abutment ring (4) and the sealing assembly (1).

3. The voltage regulator port sealing device according to claim 2, characterized in that, The two positioning components are a pressure plate (6) and an end plate (7). The sealing assembly (1) includes a pressure plate (6), a first sealing ring (8) and an end plate (7) that are sequentially fitted onto the positioning rod (2) from the outside of the pipe opening to the inside of the pipe opening. The second sealing ring (5) is located on the side of the end plate (7) away from the pressure plate (6). The side of the pressure plate (6) near the end plate (7) is provided with a convex annular abutment (9) that can apply pressure to the first sealing ring (8) by tightening the nut (3).

4. The voltage regulator port sealing device according to claim 3, characterized in that, The end plate (7) has a sealing groove (10), the first sealing ring (8) is placed in the sealing groove (10), the inner side of the sealing groove (10) has a rounded corner (11) that can fit with the first sealing ring (8), and the convex annular abutment (9) slides in cooperation with the sealing groove (10).

5. The voltage regulator port sealing device according to claim 3, characterized in that, There are two first sealing rings (8), and the two first sealing rings (8) are axially attached to the sealing groove (10) along the end plate (7).

6. The voltage regulator port sealing device according to claim 3, characterized in that, The pressure plate (6) has a circular weight-reducing hole (12), and the axis of the circular weight-reducing hole (12) is collinear with the axis of the pressure plate (6).

7. The voltage regulator port sealing device according to claim 3, characterized in that, The end plate (7) has multiple fan-shaped weight reduction grooves (13) on the side near the pressure plate (6), and the multiple fan-shaped weight reduction grooves (13) are arranged at equal intervals along the circumferential axis of the end plate (7).

8. The voltage regulator port sealing device according to any one of claims 1-7, characterized in that, The pipe fitting (14) is detachably connected to the pipe wall by at least four radial bolts (15). One end of the positioning rod (2) placed inside the pipe opening (18) is welded to the inner wall of the pipe fitting (14). No two radial bolts (15) and positioning rods (2) interfere with each other.

9. The voltage regulator port sealing device according to claim 8, characterized in that, The end of the radial bolt (15) is a smooth cylinder (16), which can be inserted into the inner wall hole (17) of the pipe opening (18).

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