A GIS sealing ring and sealing structure for nuclear power plant

Abstract

The present invention discloses a GIS sealing ring for nuclear power plants and its sealing structure, which belongs to the technical field of sealing rings, and comprises a soft ring body, a pressure-bearing external support structure is arranged in the soft ring body, an external support sealing structure is arranged on the inner edge and the outer edge of the soft ring body, and a joint surface cover structure is arranged on the upper and lower surfaces of the soft ring body. An abutment ring groove for plugging and matching with an abutment ring is arranged in the middle side of the tight pressure groove, and a second abutment ring is arranged in the tight pressure groove and located on both sides of the abutment ring groove; a limit ring is arranged on the outer side of the tight pressure groove, and the limit ring is inserted between the abutment ring and the base ring; a sealing groove is arranged in the tight pressure groove and located on the side of the limit ring, and the sealing ring is inserted into the sealing groove. Since the external support sealing structure and the inside of the soft ring body both use negative Poisson's ratio ring sheets as internal supports, after the nuts on the sealing structure are locked and the mounting bolts are installed, not only can the installation sealing characteristics be maintained, but also the matching strength of each combined section is increased under the pressure of the insulating gas in the trachea.

Description

Technical Field

[0001] The invention belongs to the technical field of sealing rings, and in particular relates to a GIS sealing ring for a nuclear power plant and a sealing structure thereof. Background Art

[0002] In the power transmission and control facilities of nuclear power plants, GIS, which is also used in traditional thermal power plants, is also used for circuit distribution and control. It uses insulating gas to prevent arcing and insulation breakdown. Its miniaturized design greatly reduces the space used in nuclear power plants. The GIS seal ring plays a key sealing role in this equipment to prevent gas leakage in the pipeline.

[0003] In order to cope with the temperature in the combined switchgear electrical equipment pipeline, the current GIS sealing ring is usually made of silicone rubber, and the compression rate is set within 25%. Annular protrusions are set at both ends of the GIS sealing ring to cooperate with the pressure holding of the pipeline end flange to effectively press on the fitting surface of the flange, thereby achieving better sealing.

[0004] The use of silicone rubber has greatly increased the high temperature resistance and corrosion resistance of GIS sealing rings. However, with long-term use, this type of GIS sealing ring will also have certain defects: First, when the pressure of the insulating gas in the pipeline increases suddenly and the overall heat of the pipeline is high, it will be forced by the internal gas pressure of the pipeline. When the gas enters the flange joint gap, it will press the GIS sealing ring outward. With long-term use, the silicone rubber will age to a certain extent, which will reduce the tensile strength of the GIS sealing ring, thereby allowing the high-voltage insulating gas to further penetrate into the flange joint, posing a considerable challenge to the overall sealing; second, under the pressure of high-voltage insulating gas, the installation stability of the GIS sealing ring is tested. Summary of the invention

[0005] The purpose of the present invention is to provide a GIS sealing ring and a sealing structure for a nuclear power plant to solve the problems existing in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions: A GIS sealing ring for a nuclear power plant, comprising a soft ring body, wherein a pressure-bearing external support structure is arranged inside the soft ring body, and the pressure-bearing external support structure is used to provide an external expansion force for the soft ring body when the soft ring body is subjected to external pressure;

[0007] The inner edge and outer edge of the soft ring body are provided with an external support sealing structure, and the external support sealing structure is used to effectively block the inner edge opening and the outer edge opening when subjected to a pushing force;

[0008] The upper and lower surfaces of the soft ring body are both provided with a combination surface cover structure, and the combination surface cover structure is effectively fitted and sealed with the sealing structure under the outward expansion support of the compressed external support structure.

[0009] A sealing structure using a GIS sealing ring for a nuclear power plant, comprising an air pipe, a convex ring arranged at an air pipe port, a side clamping ring arranged at an outer edge of the convex ring, and a mounting ring plate arranged at an outer edge of the side clamping ring;

[0010] The mounting ring plate is evenly plugged with mounting bolts in a circumferential direction, and washers are sleeved on the mounting bolts and locked by nuts;

[0011] A close pressing groove is provided in the pressing convex ring, and a pressing insert ring 1 is provided on the inner edge side of the close pressing groove. The pressing insert ring 1 is inserted into the insert ring groove and abuts between the side convex rings;

[0012] The edge ring is provided with an edge ring groove and the edge ring body is pressed into the edge ring groove. A limit ring groove and a limit insert ring are provided at the outer edge of the edge ring. The limit ring groove is inserted into the limit insert ring.

[0013] The middle side of the sealing groove is provided with an abutment ring groove which is plugged with the abutment ring, and a second abutment ring is provided in the sealing groove and at both sides of the abutment ring groove, and the second abutment ring penetrates the abutment ring opening to the packing ring;

[0014] An anti-shift ring groove is provided in the sealing groove and at the side of the second abutting ring, and the anti-shift ring is inserted into the anti-shift ring groove;

[0015] A limiting ring is provided on the outer side of the sealing groove, and the limiting ring is inserted between the sealing ring and the base ring. A sealing groove is provided in the sealing groove and located at the side of the limiting ring, and the sealing ring is inserted into the sealing groove.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] Combined with the diversified concave and convex sealing configuration of the surface cover structure, the gas leakage path length and sealing strength are increased;

[0018] Since the negative Poisson's ratio ring piece is used as the internal support for the external support sealing structure and the soft ring body, after the nuts on the sealing structure are tightened with the mounting bolts, not only can the sealing characteristics of the installation be maintained, but also the matching strength of each combined section is increased under the pressure of the insulating gas in the air pipe;

[0019] The elastic inner mesh frame expands laterally toward the inner and outer edges due to compression, thereby providing more effective lateral pressure on the externally supported sealing structure, and effectively sealing the inner and outer edges of the sealing structure, especially when the upper and lower mesh surfaces of the elastic inner mesh frame are arranged on the elastic support for the overall joint surface cover structure. Even if the elastic restoring force of the soft ring body is reduced due to aging under long-term use, the soft ring body can still be effectively and tightly fitted with the sealing groove under its elastic support.

[0020] The combined surface and cover structure has good anti-displacement performance and can effectively avoid the displacement of the sealing ring caused by the infiltration of high-voltage insulating gas.

[0021] In summary, the present invention can solve the problems existing in the above-mentioned prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view schematic diagram of the present invention;

[0023] Figure 2 for Figure 1 A partial cutaway diagram of

[0024] Figure 3 for Figure 2 A schematic diagram of the partially enlarged structure;

[0025] Figure 4 for Figure 1 A top view schematic diagram of

[0026] Figure 5 It is a top view schematic diagram of the elastic inner net frame in the present invention;

[0027] Figure 6 It is a schematic diagram of the main view of the cooperation between the GIS sealing ring and the sealing structure in the present invention;

[0028] Figure 7 for Figure 6 A partial cutaway diagram of

[0029] Figure 8 for Figure 7 Schematic diagram of the local enlarged structure.

[0030] In the figure: 1 soft ring body, 2 elastic inner net frame, 3 ring frame, 4 pressure spring ring one, 5 edge ring body, 6 pressure spring ring two, 7 sealing ring, 8 base ring, 9 abutment ring, 10 anti-displacement ring, 11 packing ring, 12 soft sealing ring, 13 plug-in ring groove, 14 edge convex ring, 15 plug ring, 16 pressure spring ring three, 17 inner soft ring, 18 air pipe, 19 pressure convex ring, 20 edge clamp ring, 21 mounting ring plate, 22 mounting bolts, 23 washers, 24 nuts, 25 support column, 26 plug connector, 27 pressure sensitive pressure sensor, 28 tight pressure groove, 29 pressure plug ring one, 30 plug ring two, 31 limit ring, 32 sealing groove, 33 edge ring groove, 34 limit ring groove, 35 limit plug ring. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0032] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 A GIS sealing ring for a nuclear power plant comprises a soft ring body 1, the soft ring body 1 is made of silicone rubber, a pressure-bearing external support structure is arranged inside the soft ring body 1, and the pressure-bearing external support structure is used to provide an outward expansion force for the soft ring body 1 when the soft ring body 1 is subjected to external pressure;

[0033] The inner and outer edges of the soft ring body 1 are provided with an external support sealing structure, which is used to effectively seal the inner and outer edge openings when subjected to a pushing force;

[0034] The upper and lower surfaces of the soft ring body 1 are both provided with a combination surface cover structure, and the combination surface cover structure is effectively fitted and sealed with the sealing structure under the outward support of the compressed external support structure.

[0035] See also Figure 2 , Figure 3 and Figure 5 The compressed external support structure includes an elastic inner mesh frame 2 arranged inside the soft ring body 1. The material of the elastic inner mesh frame 2 is tungsten-vanadium alloy, and the outer diameter of the mesh is 1 mm. Under the setting of the elastic inner mesh frame 2, the outward elastic support performance of the soft ring body 1 is increased, so that the soft ring body 1 and the sealing structure are more tightly covered. A ring frame 3 is arranged inside the soft ring body 1 and inside the elastic inner mesh frame 2. The wall thickness of the ring frame 3 is 0.3 mm, and the material is aluminum. Rings are arranged on the inner and outer edges of the ring frame 3. The ring frame 3 is a circular ring structure with a long O-shaped cross section. The ring frame 3 is tightly filled with a compression ring 4. The compression ring 4 is made of tensile polytetrafluoroethylene, and the thickness is one-fourth of the soft ring body 1. It belongs to a negative Poisson's ratio material. When its inner edge is bulged by gas, its inner edge cross-sectional area increases, further bulging the inner and outer edges and the upper and lower surfaces of the soft ring body 1.

[0036] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The outer support sealing structure includes an edge ring body 5 integrally arranged on the outer edge of the soft ring body 1 and an inserting ring groove 13 arranged on the inner edge of the soft ring body 1;

[0037] The edge ring body 5 is welded with a second compression ring 6, which is made of tensile polytetrafluoroethylene. The left and right sides of the plug-in ring groove 13 are welded with edge convex rings 14, which are circular ring structures with isosceles trapezoidal protrusions in the cross section and are made of ABS plastic. The inner edge of the soft ring body 1 is integrally provided with a plug ring 15, and the soft ring body 1 is welded with a third compression ring 16, which is made of high-precision turning of a zirconia ceramic segment profile, and a conical ring groove is set on the middle side of its outer edge to effectively fit the plug ring 15, and has good negative Poisson's ratio performance. An inner soft ring 17 is welded inside the third compression ring 16, and the material of the inner soft ring 17 is fluororubber.

[0038] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The combined surface cover structure includes a sealing ring 7 integrally arranged on the outer side of the upper and lower surfaces of the soft ring body 1, a base ring 8 integrally arranged on the upper and lower surfaces of the soft ring body 1 and located inside the sealing ring 7, an anti-displacement ring 10 is uniformly welded on the inner and outer sides of the base ring 8, and the material of the anti-displacement ring 10 is stainless steel; an abutment ring 9 is integrally arranged on the middle side of the base ring 8.

[0039] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The joint surface cover structure also includes a packing ring groove disposed on the platform ring 8 and located between the anti-displacement ring 10 and the abutment ring 9. A packing ring 11 is disposed in the packing ring groove. The packing ring 11 is formed by nano-oxidation powder tightly filling the packing ring groove, and has good insulation and abutment sealing properties. A soft sealing ring 12 is integrally disposed at the port of the packing ring groove, and an abutment ring opening is disposed at the top of the soft sealing ring 12.

[0040] When the abutment ring opening of the soft sealing ring 12 is not abutted, the elastic force of the soft sealing ring 12 can prevent the packing ring 11 from being discharged.

[0041] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 and Figure 8 A sealing structure using a GIS sealing ring for a nuclear power plant includes an air pipe 18, a pressure convex ring 19 integrally arranged at the end of the air pipe 18, an edge clamp ring 20 integrally arranged at the outer edge of the pressure convex ring 19, and a mounting ring plate 21 integrally arranged at the outer edge of the edge clamp ring 20;

[0042] The mounting bolts 22 are inserted and slidably connected to the mounting ring plate 21 in an annular direction. The mounting bolts 22 are sleeved with washers 23 and are locked by nuts 24.

[0043] A sealing groove 28 is provided in the pressing convex ring 19, and the size of the sealing groove 28 is set to meet the requirement that the sealing ring is effectively pressed against the inner wall of the sealing groove 28. A pressing insert ring 29 is integrally provided on the inner edge of the sealing groove 28, and the pressing insert ring 29 is a variable diameter cone ring structure; the pressing insert ring 29 is inserted into the plug-in ring groove 13 and abuts between the edge convex rings 14;

[0044] When the pressing insert ring 29 is inserted into the insert ring groove 13, the side convex rings 14 are directly pressed and expand outwards to the inside and outside, thereby providing a more powerful condition for the external support sealing structure to work effectively.

[0045] An edge ring groove 33 is provided in the edge clamp ring 20 and the edge ring body 5 is pressed into the edge ring groove 33. A limiting ring groove 34 and a limiting insert ring 35 are provided at the outer edge of the edge clamp ring 20. The limiting ring groove 34 is slidably inserted into the limiting insert ring 35.

[0046] Under such a configuration, under the pressure of the upper and lower edge ring grooves 33 and the cooperation between the pressure inserting ring 1 29 and the plug-in outer support of the plug-in ring groove 13, the edge ring body 5 is effectively pressed into the edge ring groove 33. Secondly, the compression spring ring 2 6 expands outward longitudinally due to the pressure, so that the edge ring body 5 is more effectively pressed against the inner wall of the edge ring groove 33, thereby increasing its sealing performance.

[0047] The sliding and plugging cooperation between the limiting ring groove 34 and the limiting insert ring 35 can effectively enhance the stability of the air pipe 18 docking.

[0048] The middle side of the tight pressure groove 28 is provided with an abutment ring groove whose inner wall is tightly plugged with the abutment ring 9. A second abutment ring 30 is integrally provided in the tight pressure groove 28 and at both sides of the abutment ring groove. The second abutment ring 30 is a circular ring structure with an isosceles trapezoidal cross section. The second abutment ring 30 passes through the abutment ring opening to the packing ring 11.

[0049] The second insert ring 30 is inserted into the packing ring 11, and the second insert ring 30 is pressed and sealed on the top of the soft sealing ring 12. The packing ring 11 cannot be discharged, and due to the addition of the second insert ring 30, the nano powder in the packing ring 11 can be further compacted and expanded laterally, which not only makes it cooperate with the second insert ring 30 for sealing, but also makes the limit ring 31 and the sealing groove 28 more effectively squeezed due to the outward expansion effect, and at the same time can also enhance the stability of the sealing ring and the sealing groove 28, and the sealing ring is not easy to move under the pressure of the insulating gas.

[0050] An anti-shift ring groove is provided in the sealing groove 28 and at the side of the second abutting ring 30, and the anti-shift ring 10 is inserted into the anti-shift ring groove;

[0051] When the anti-displacement ring 10 is pressed and inserted into the anti-displacement ring groove, the stability of the sealing ring under the air pressure in the sealing structure can be effectively enhanced to ensure the stability of its sealing performance.

[0052] A limit ring 31 is provided on the outer side of the sealing groove 28 , and the limit ring 31 is pressed and inserted between the sealing ring 7 and the base ring 8 . A sealing groove 32 is provided in the sealing groove 28 and located on the side of the limit ring 31 , and the sealing ring 7 is pressed and inserted into the sealing groove 32 .

[0053] Under the pressure of the upper and lower pressure convex rings 19, the elastic inner mesh frame 2 expands laterally toward the inner and outer edges due to compression, thereby more effectively applying lateral pressure to the externally supported sealing structure, and effectively sealing the inner and outer edges of the sealing structure. In particular, the upper and lower mesh surfaces of the elastic inner mesh frame 2 are arranged on the elastic support for the overall joint surface cover structure. Even if the elastic restoring force of the soft ring body 1 is reduced due to aging under long-term use, the soft ring body 1 can still be effectively and tightly fitted with the sealing groove 28 under its elastic support.

[0054] Due to the diversified concave-convex sealing arrangement of the combined surface and cover structure, the gas leakage path length and sealing strength are increased.

[0055] Since the outer support sealing structure and the inside of the soft ring body 1 both use negative Poisson's ratio ring sheets as internal supports, after the nut 24 on the sealing structure is tightened to install the bolts, not only can the installation sealing characteristics be maintained, but also the matching strength of each combined cross-section is increased under the pressure of the insulating gas in the air pipe 18, which is specifically manifested as follows: when the insulating high-pressure gas penetrates into the matching gap of the pressure convex ring 19, the pressure spring ring 1 4, the pressure spring ring 2 6 and the pressure spring ring 3 16 all expand slightly outward, thereby being further stretched, and due to the negative Poisson's ratio characteristics of the pressure spring ring 1 4, the pressure spring ring 2 6 and the pressure spring ring 3 16, the cross-sectional thickness of the three can be expanded according to the small external expansion, thereby intensifying the pressure of the edge ring body 5 on the inner wall of the edge ring groove 33, intensifying the sealing strength of the convex part of the inner soft ring 17 on the inner edge gap of the dense pressure groove 28, and intensifying the top expansion of the upper and lower surfaces of the elastic inner net frame 2, thereby strengthening the pressure sealing of the combined surface cover structure and the concave and convex design of the upper and lower surfaces of the dense pressure groove 28.

[0056] See also Figure 6 , Figure 7 and Figure 8 , support columns 25 are evenly arranged in the circumferential direction between the mounting ring plates 21, and a plug connector 26 is integrally arranged at the bottom of the support columns 25. The support columns 25 and the plug connector 26 are made of fluororubber. The plug connector 26 is inserted into and bonded to the head groove provided on the lower mounting ring plate 21. The top of the support columns 25 is screwed to fix the pressure-sensitive pressure sensor 27, and the pressure-sensitive surface of the pressure-sensitive pressure sensor 27 is screwed to fix the contact plate, and the contact plate is bonded to the top of the support columns 25 with resin glue.

[0057] This kind of pressure-sensing structure is set on the outside of each mounting bolt 22. The pressure-sensitive pressure sensors 27 are all equipped with encrypted numbers. The transmission lines of the pressure-sensitive pressure sensors 27 are connected to the multi-bit interface of the pressure display to display the tightening strength of the nut 24. Therefore, when tightening the nut 24, the tightening strength of the nut 24 to the mounting bolt 22 can be determined by observing the pressure values ​​corresponding to the numbers on the pressure display, and its tightness can be adjusted in real time, so that the sealing ring is balanced in pressure at each side of the sealing structure.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A GIS sealing ring for a nuclear power plant, characterized in that: It comprises a soft ring body (1), wherein a pressure-bearing external support structure is arranged inside the soft ring body (1), and the pressure-bearing external support structure is used to provide an outward expansion force for the soft ring body (1) when the soft ring body (1) is subjected to external pressure; The inner edge and the outer edge of the soft ring body (1) are provided with an external support sealing structure, and the external support sealing structure is used to effectively seal the inner edge opening and the outer edge opening when subjected to a pushing force; The upper and lower surfaces of the soft ring body (1) are both provided with a joint surface cover structure, and the joint surface cover structure is effectively fitted and sealed with the sealing structure under the outward expansion support of the pressure-bearing external support structure; The pressure-bearing external support structure comprises a soft ring body (1) having an elastic inner net frame (2), a ring frame (3) being arranged inside the soft ring body (1) and inside the elastic inner net frame (2), and a pressure spring ring (4) being arranged inside the ring frame (3); The external support sealing structure comprises an edge ring body (5) arranged on the outer edge of the soft ring body (1) and an inserting ring groove (13) arranged on the inner edge of the soft ring body (1); A second compression ring (6) is arranged in the edge ring body (5), edge convex rings (14) are arranged on both sides of the plug-in ring groove (13), a plug ring (15) is arranged on the inner edge of the soft ring body (1), a third compression ring (16) is arranged in the soft ring body (1), and an inner soft ring (17) is arranged in the third compression ring (16); The joint surface cover structure comprises a sealing ring (7) arranged on the outer side of the upper and lower surfaces of the soft ring body (1); a support ring (8) is arranged on the upper and lower surfaces of the soft ring body (1) and located inside the sealing ring (7); anti-displacement rings (10) are evenly arranged on the inner and outer sides of the support ring (8); and an abutment ring (9) is arranged on the middle side of the support ring (8).

2. The GIS sealing ring for a nuclear power plant according to claim 1, characterized in that: The joint surface cover structure also includes a packing ring groove arranged on the base ring (8) and located between the anti-displacement ring (10) and the abutment ring (9), a packing ring (11) being arranged in the packing ring groove, a soft sealing ring (12) being arranged at the end of the packing ring groove, and an abutment ring opening being arranged at the top of each of the soft sealing rings (12).

3. A sealing structure using the GIS sealing ring for a nuclear power plant according to claim 2, characterized in that: It comprises an air pipe (18), a pressure convex ring (19) arranged at the port of the air pipe (18), a side clamping ring (20) arranged at the outer edge of the pressure convex ring (19), and a mounting ring plate (21) arranged at the outer edge of the side clamping ring (20); The mounting ring plate (21) is evenly and circumferentially plugged with mounting bolts (22), and washers (23) are sleeved on the mounting bolts (22) and are locked by nuts (24); The pressing convex ring (19) is provided with a sealing groove (28), and the inner edge of the sealing groove (28) is provided with a pressing insert ring (29), and the pressing insert ring (29) is inserted into the insert ring groove (13) and abuts between the edge convex rings (14); An edge ring groove (33) is provided in the edge clamp ring (20), and the edge ring body (5) is crimped into the edge ring groove (33); a limiting ring groove (34) and a limiting insert ring (35) are provided at the outer edge of the edge clamp ring (20); the limiting ring groove (34) is inserted into the limiting insert ring (35); A contact ring groove for inserting and cooperating with the contact ring (9) is provided at the middle side of the sealing groove (28), and a second contact ring (30) is provided in the sealing groove (28) and at both sides of the contact ring groove. The second contact ring (30) passes through the contact ring opening and reaches the packing ring (11); An anti-displacement ring groove is provided in the sealing groove (28) and at the side of the second abutment ring (30), and the anti-displacement ring (10) is inserted into the anti-displacement ring groove; A limit ring (31) is provided on the outer side of the sealing groove (28), and the limit ring (31) is inserted between the sealing ring (7) and the support ring (8). A sealing groove (32) is provided in the sealing groove (28) and at the side of the limit ring (31), and the sealing ring (7) is inserted into the sealing groove (32).

4. The sealing structure according to claim 3, characterized in that: A support column (25) is arranged between the mounting ring plates (21), a plug connector (26) is arranged at the bottom of the support column (25), and the plug connector (26) is inserted into a head groove provided on the lower mounting ring plate (21), and a pressure-sensitive pressure sensor (27) is installed on the top of the support column (25), and a contact plate is arranged on the pressure-sensitive surface of the pressure sensor (27), and the contact plate is fixedly arranged on the top of the support column (25).

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