Gasket for nuclear power plant ventilation system

Abstract

The utility model discloses a sealing gasket for nuclear power plant ventilation system, including annular gasket body, at least one convex on the surface of gasket body annular line body, the annular line body forms line seal structure on the surface of gasket body, the sealing gasket for nuclear power plant ventilation system of the utility model, sealing gasket sets up convex annular line body and forms line seal structure, and the line seal structure has greater compensation capacity and lower bolt pressure than surface seal structure, effectively solve the sealing failure problem caused by the deformation of nuclear power plant ventilation system flange.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power sealing technology, and in particular to a sealing gasket for a ventilation system in a nuclear power plant. Background Technology

[0002] Type B gaskets (butyl rubber) are widely used in the ventilation systems of nuclear power plants. However, Type B gaskets are relatively soft (like chewing gum) and soften further when heated. In practical applications, they are prone to softening and deformation and cannot be tightened again. Under wind pressure, they are easily squeezed out of the flange surface, causing leakage. In particular, leakage in the iodine circuit of the ventilation system affects the safe and stable operation of the unit.

[0003] To improve the operational safety of nuclear power plants, reduce the risk of uncontrolled radioactive gas leaks and personnel radiation exposure, lower maintenance costs after gasket failure, and improve the sealing effect and service life of flange gaskets, it is necessary to improve existing gaskets to ensure the safe operation of relevant equipment and systems in nuclear power plants. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an improved sealing gasket for a ventilation system in a nuclear power plant.

[0005] The technical solution adopted by this utility model to solve its technical problem is: to provide a sealing gasket for a ventilation system of a nuclear power plant, including an annular gasket body and at least one annular line protruding from a surface of the gasket body; the annular line forms a line sealing structure on the surface of the gasket body.

[0006] In some embodiments, the thickness of the gasket body is 2mm to 5mm; the cross-section of the annular wire is semi-circular.

[0007] In some embodiments, the cross-section of the annular wire is a semicircle with a radius of 1 mm.

[0008] In some embodiments, the annular thread is located on the surface of the gasket body near the inner periphery of the gasket body.

[0009] In some embodiments, the gasket body is further provided with a plurality of circumferentially distributed through holes; the through holes are located between the outer periphery of the gasket body and the annular line.

[0010] In some embodiments, two rings of the annular line are provided on the surface of the gasket body.

[0011] In some embodiments, the spacing between the two loops of the annular wire is 3mm to 5mm.

[0012] In some embodiments, the center distance between the two loops of the annular wire is 7 mm.

[0013] In some embodiments, the gasket body is an annular gasket.

[0014] In some embodiments, the gasket body is a square gasket.

[0015] In some embodiments, the sealing gasket is an EPDM rubber gasket containing activators, antioxidants, reinforcing fillers, softeners, crosslinking agents, and vulcanizing agents.

[0016] The beneficial effects of this utility model are as follows: the sealing gasket is provided with a protruding annular line to form a line sealing structure, which has a greater compensation capacity and lower bolt tightening force than a surface sealing structure, effectively solving the problem of sealing failure caused by deformation at the flange of the ventilation system of nuclear power plants. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the structure of a sealing gasket according to an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A schematic diagram of the AA-direction cross-sectional structure of the sealing gasket shown;

[0020] Figure 3 yes Figure 2 A magnified structural diagram of part B in the middle section;

[0021] Figure 4 This is a schematic diagram of the structure of a sealing gasket according to another embodiment of the present invention. Detailed Implementation

[0022] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0023] like Figures 1 to 3 As shown, a sealing gasket for a ventilation system in a nuclear power plant according to an embodiment of the present invention includes a gasket body 10 and at least one annular line 20 protruding from the gasket body 10.

[0024] The gasket body 10 is an annular gasket, thus having an inner peripheral edge located on the inside and an outer peripheral edge located on the outside. An annular line 20 protrudes from one surface of the gasket body 10 and is located close to the inner peripheral edge of the gasket body 10. The annular line 20 corresponds to the annular arrangement of the gasket body 10, and is therefore also annular overall; its protrusion on the gasket body 10 forms a line sealing structure for the gasket body 10. Compared to a sealing gasket that uses its entire surface as a sealing structure, the line sealing structure has greater compensation capacity and lower bolt tightening force, effectively solving the problem of sealing failure caused by flange deformation in the field.

[0025] The thickness of the gasket body 10 is 2mm to 5mm, and the preferred thickness of 2mm is thinner and lighter than that of gaskets in the prior art.

[0026] exist Figure 1 In the embodiment shown, the gasket body 10 is a circular annular gasket, and the corresponding annular thread 20 is also a circular annular thread.

[0027] Furthermore, the cross-section (radial section) of the annular line 20 is semi-circular.

[0028] In some embodiments, the protrusion height of the annular wire 20 on the gasket body 10 is 1 mm, that is, the cross-section of the annular wire 20 is a semicircle with a radius of 1 mm.

[0029] Preferably, the surface of the gasket body 10 is provided with two spaced annular lines 20.

[0030] In some embodiments, the spacing between the two loops of wire 20 can be 3mm to 5mm. The center distance between the two loops of wire 20 can be 7mm.

[0031] Furthermore, the gasket body 10 is provided with a plurality of through holes 11, which are distributed at intervals along the circumference of the gasket body 10. In addition, the through holes 11 are located between the outer periphery of the gasket body 10 and the annular line 20.

[0032] like Figure 4 As shown, another embodiment of the present invention provides a sealing gasket for a nuclear power plant ventilation system, which includes a gasket body 10 and at least one annular line 20 protruding from the gasket body 10.

[0033] The gasket body 10 is an annular gasket, thus having an inner peripheral edge located on the inside and an outer peripheral edge located on the outside. An annular line 20 protrudes from one surface of the gasket body 10 and is located close to the inner peripheral edge of the gasket body 10. The annular line 20 corresponds to the annular arrangement of the gasket body 10, and is therefore also annular overall; its protrusion on the gasket body 10 forms a line sealing structure for the gasket body 10. Compared to a sealing gasket that uses its entire surface as a sealing structure, the line sealing structure has greater compensation capacity and lower bolt tightening force, effectively solving the problem of sealing failure caused by flange deformation in the field.

[0034] exist Figure 2 In the illustrated embodiment, the gasket body 10 is a square gasket, and each opposite corner of the square gasket is rounded. Corresponding to the square gasket, the annular wire 20 is a square loop-shaped wire, and each opposite corner of the wire is also rounded.

[0035] The thickness of the gasket body 10 is 2mm to 5mm, and 2mm is preferred for a thinner and lighter feature.

[0036] The cross-section (radial section) of the annular wire 20 is semi-circular. In some embodiments, the protrusion height of the annular wire 20 on the gasket body 10 is 1 mm, that is, the cross-section of the annular wire 20 is a semi-circle with a radius of 1 mm.

[0037] Preferably, the surface of the gasket body 10 is provided with two spaced annular lines 20.

[0038] In some embodiments, the spacing between the two loops of wire 20 can be 3mm to 5mm. The center distance between the two loops of wire 20 can be 7mm.

[0039] Furthermore, the gasket body 10 is provided with a plurality of through holes 11, which are distributed at intervals along the circumference of the gasket body 10. In addition, the through holes 11 are located between the outer periphery of the gasket body 10 and the annular line 20.

[0040] Furthermore, the sealing gasket of this invention can also improve its performance in terms of heat resistance, radiation resistance, high resilience, and sealing by setting the material.

[0041] The base material of the sealing gasket is EPDM rubber, which has good temperature and radiation resistance and can maintain good sealing performance, hence the name EPDM rubber gasket. By adding activators, antioxidants, reinforcing fillers, softeners, crosslinking agents, and vulcanizing agents, a sealing gasket with excellent comprehensive performance and stability is obtained, exhibiting superior heat resistance, radiation resistance, good crosslinking degree, high resilience, aging resistance, and sealing performance.

[0042] The raw materials for sealing gaskets, including the matrix material and various compounding agents, are produced through intensive mixing and vulcanization. The specific mass proportions of the raw materials can be: 80-100 parts of EPDM rubber, 3-7 parts of zinc oxide activator, 3-8 parts of antioxidant, 40-80 parts of reinforcing filler, 5-25 parts of softener, 1-6 parts of crosslinking agent, and 2-10 parts of vulcanizing agent.

[0043] Taking a 2mm thick sealing gasket and a double-ringed sealing line structure as an example, the service life under given working conditions is no less than 10 years, with a cumulative radiation tolerance dose of 2.1 × 10⁻⁶. 5 Gy.

[0044] The sealing gasket of this invention can be used for a long time in the high temperature and high radiation dose environment of nuclear power plants, improving the sealing effect and service life.

[0045] This utility model of sealing gasket can solve the problem of frequent sealing surface leakage in pipelines of nuclear power plant ventilation systems, improve system operation safety, reduce uncontrollable leakage of radioactive gases and personnel radiation risks, reduce maintenance costs after gasket failure, and improve the sealing effect and service life of flange sealing gaskets. It is suitable for sealing flange connections of high-temperature and high-radiation-dose pipelines such as emergency iodine circuits in nuclear power plant ventilation systems. Its application scope covers flange sealing surfaces of various reactor types of nuclear power plant ventilation systems, including equipment flanges and pipe flange sealing surfaces, mainly including pipelines, regulating valves, isolation valves, fire dampers, silencers, flow meters, electric heaters, pre-filters, high-efficiency filters, iodine adsorbers, and other equipment flange sealing surfaces.

[0046] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A sealing gasket for a ventilation system in a nuclear power plant, characterized in that, It includes an annular gasket body and two annular lines protruding from one surface of the gasket body; The annular wire forms a line seal structure on the surface of the gasket body; the thickness of the gasket body is 2mm to 5mm; the cross-section of the annular wire is a semicircle with a radius of 1mm; the spacing between two annular wires is 3mm to 5mm. The annular thread is located on the surface of the gasket body near the inner periphery of the gasket body; the gasket body is also provided with a plurality of circumferentially distributed through holes; the through holes are located between the outer periphery of the gasket body and the annular thread. The gasket body is a square gasket, and each opposite corner of the square gasket is rounded; the annular wire is a square ring-shaped wire, and each opposite corner of the wire is also rounded.

2. The sealing gasket according to claim 1, characterized in that, The center distance between the two ring-shaped bodies is 7mm.

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